/*
 * GPL HEADER START
 *
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 only,
 * as published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * General Public License version 2 for more details (a copy is included
 * in the LICENSE file that accompanied this code).
 *
 * You should have received a copy of the GNU General Public License
 * version 2 along with this program; If not, see
 * http://www.gnu.org/licenses/gpl-2.0.html
 *
 * GPL HEADER END
 */
/*
 * Copyright (c) 2007, 2010, Oracle and/or its affiliates. All rights reserved.
 * Use is subject to license terms.
 *
 * Copyright (c) 2011, 2017, Intel Corporation.
 */
/*
 * This file is part of Lustre, http://www.lustre.org/
 *
 * lustre/osd/osd_handler.c
 *
 * Top-level entry points into osd module
 *
 * Author: Nikita Danilov <nikita@clusterfs.com>
 *         Pravin Shelar <pravin.shelar@sun.com> : Added fid in dirent
 */

#define DEBUG_SUBSYSTEM S_OSD

#include <linux/fs_struct.h>
#include <linux/module.h>
#include <linux/user_namespace.h>
#include <linux/uidgid.h>

/* prerequisite for linux/xattr.h */
#include <linux/types.h>
/* prerequisite for linux/xattr.h */
#include <linux/fs.h>
/* XATTR_{REPLACE,CREATE} */
#include <linux/xattr.h>

#include <ldiskfs/ldiskfs.h>
#include <ldiskfs/xattr.h>
#include <ldiskfs/ldiskfs_extents.h>
#undef ENTRY
/*
 * struct OBD_{ALLOC,FREE}*()
 */
#include <obd_support.h>
#include <libcfs/libcfs.h>
/* struct ptlrpc_thread */
#include <lustre_net.h>
#include <lustre_fid.h>
/* process_config */
#include <uapi/linux/lustre/lustre_param.h>
#include <uapi/linux/lustre/lustre_disk.h>

#include "osd_internal.h"
#include "osd_dynlocks.h"

/* llo_* api support */
#include <md_object.h>
#include <lustre_quota.h>

#include <lustre_linkea.h>

/* encoding routines */
#include <lustre_crypto.h>

/* Maximum EA size is limited by LNET_MTU for remote objects */
#define OSD_MAX_EA_SIZE 1048364

int ldiskfs_pdo = 1;
module_param(ldiskfs_pdo, int, 0644);
MODULE_PARM_DESC(ldiskfs_pdo, "ldiskfs with parallel directory operations");

int ldiskfs_track_declares_assert;
module_param(ldiskfs_track_declares_assert, int, 0644);
MODULE_PARM_DESC(ldiskfs_track_declares_assert, "LBUG during tracking of declares");

/* Slab to allocate dynlocks */
struct kmem_cache *dynlock_cachep;

/* Slab to allocate osd_it_ea */
struct kmem_cache *osd_itea_cachep;

static struct lu_kmem_descr ldiskfs_caches[] = {
	{
		.ckd_cache = &dynlock_cachep,
		.ckd_name  = "dynlock_cache",
		.ckd_size  = sizeof(struct dynlock_handle)
	},
	{
		.ckd_cache = &osd_itea_cachep,
		.ckd_name  = "osd_itea_cache",
		.ckd_size  = sizeof(struct osd_it_ea)
	},
	{
		.ckd_cache = NULL
	}
};

static const char dot[] = ".";
static const char dotdot[] = "..";

static const struct lu_object_operations      osd_lu_obj_ops;
static const struct dt_object_operations      osd_obj_ops;
static const struct dt_object_operations      osd_obj_otable_it_ops;
static const struct dt_index_operations       osd_index_iam_ops;
static const struct dt_index_operations       osd_index_ea_ops;

static int osd_remote_fid(const struct lu_env *env, struct osd_device *osd,
			  const struct lu_fid *fid);
static int osd_process_scheduled_agent_removals(const struct lu_env *env,
						struct osd_device *osd);
static int osd_xattr_set(const struct lu_env *env, struct dt_object *dt,
			 const struct lu_buf *buf, const char *name, int fl,
			 struct thandle *handle);

int osd_trans_declare_op2rb[] = {
	[OSD_OT_ATTR_SET]	= OSD_OT_ATTR_SET,
	[OSD_OT_PUNCH]		= OSD_OT_MAX,
	[OSD_OT_XATTR_SET]	= OSD_OT_XATTR_SET,
	[OSD_OT_CREATE]		= OSD_OT_DESTROY,
	[OSD_OT_DESTROY]	= OSD_OT_CREATE,
	[OSD_OT_REF_ADD]	= OSD_OT_REF_DEL,
	[OSD_OT_REF_DEL]	= OSD_OT_REF_ADD,
	[OSD_OT_WRITE]		= OSD_OT_WRITE,
	[OSD_OT_INSERT]		= OSD_OT_DELETE,
	[OSD_OT_DELETE]		= OSD_OT_INSERT,
	[OSD_OT_QUOTA]		= OSD_OT_MAX,
};

static int osd_has_index(const struct osd_object *obj)
{
	return obj->oo_dt.do_index_ops != NULL;
}

static int osd_object_invariant(const struct lu_object *l)
{
	return osd_invariant(osd_obj(l));
}

/*
 * Concurrency: doesn't matter
 */
static int osd_is_write_locked(const struct lu_env *env, struct osd_object *o)
{
	struct osd_thread_info *oti = osd_oti_get(env);

	return oti->oti_w_locks > 0 && o->oo_owner == env;
}

/*
 * Concurrency: doesn't access mutable data
 */
static int osd_root_get(const struct lu_env *env,
			struct dt_device *dev, struct lu_fid *f)
{
	lu_local_obj_fid(f, OSD_FS_ROOT_OID);
	return 0;
}

/*
 * the following set of functions are used to maintain per-thread
 * cache of FID->ino mapping. this mechanism is needed to resolve
 * FID to inode at dt_insert() which in turn stores ino in the
 * directory entries to keep ldiskfs compatible with ext[34].
 * due to locking-originated restrictions we can't lookup ino
 * using LU cache (deadlock is possible). lookup using OI is quite
 * expensive. so instead we maintain this cache and methods like
 * dt_create() fill it. so in the majority of cases dt_insert() is
 * able to find needed mapping in lockless manner.
 */
static struct osd_idmap_cache *
osd_idc_find(const struct lu_env *env, struct osd_device *osd,
	     const struct lu_fid *fid)
{
	struct osd_thread_info *oti = osd_oti_get(env);
	struct osd_idmap_cache *idc = oti->oti_ins_cache;
	int i;

	for (i = 0; i < oti->oti_ins_cache_used; i++) {
		if (!lu_fid_eq(&idc[i].oic_fid, fid))
			continue;
		if (idc[i].oic_dev != osd)
			continue;

		return idc + i;
	}

	return NULL;
}

static struct osd_idmap_cache *
osd_idc_add(const struct lu_env *env, struct osd_device *osd,
	    const struct lu_fid *fid)
{
	struct osd_thread_info *oti   = osd_oti_get(env);
	struct osd_idmap_cache *idc;
	int i;

	if (unlikely(oti->oti_ins_cache_used >= oti->oti_ins_cache_size)) {
		i = oti->oti_ins_cache_size * 2;
		if (i == 0)
			i = OSD_INS_CACHE_SIZE;
		OBD_ALLOC_PTR_ARRAY_LARGE(idc, i);
		if (idc == NULL)
			return ERR_PTR(-ENOMEM);
		if (oti->oti_ins_cache != NULL) {
			memcpy(idc, oti->oti_ins_cache,
			       oti->oti_ins_cache_used * sizeof(*idc));
			OBD_FREE_PTR_ARRAY_LARGE(oti->oti_ins_cache,
					   oti->oti_ins_cache_used);
		}
		oti->oti_ins_cache = idc;
		oti->oti_ins_cache_size = i;
	}

	idc = oti->oti_ins_cache + oti->oti_ins_cache_used++;
	idc->oic_fid = *fid;
	idc->oic_dev = osd;
	idc->oic_lid.oii_ino = 0;
	idc->oic_lid.oii_gen = 0;
	idc->oic_remote = 0;

	return idc;
}

/*
 * lookup mapping for the given fid in the cache, initialize a
 * new one if not found. the initialization checks whether the
 * object is local or remote. for local objects, OI is used to
 * learn ino/generation. the function is used when the caller
 * has no information about the object, e.g. at dt_insert().
 */
static struct osd_idmap_cache *
osd_idc_find_or_init(const struct lu_env *env, struct osd_device *osd,
		     const struct lu_fid *fid)
{
	struct osd_idmap_cache *idc;
	int rc;

	idc = osd_idc_find(env, osd, fid);
	LASSERT(!IS_ERR(idc));
	if (idc != NULL)
		return idc;

	CDEBUG(D_INODE, "%s: FID "DFID" not in the id map cache\n",
	       osd->od_svname, PFID(fid));

	/* new mapping is needed */
	idc = osd_idc_add(env, osd, fid);
	if (IS_ERR(idc)) {
		CERROR("%s: FID "DFID" add id map cache failed: %ld\n",
		       osd->od_svname, PFID(fid), PTR_ERR(idc));
		return idc;
	}

	/* initialize it */
	rc = osd_remote_fid(env, osd, fid);
	if (unlikely(rc < 0))
		return ERR_PTR(rc);

	if (rc == 0) {
		/* the object is local, lookup in OI */
		/* XXX: probably cheaper to lookup in LU first? */
		rc = osd_oi_lookup(osd_oti_get(env), osd, fid,
				   &idc->oic_lid, 0);
		if (unlikely(rc < 0)) {
			CERROR("can't lookup: rc = %d\n", rc);
			return ERR_PTR(rc);
		}
	} else {
		/* the object is remote */
		idc->oic_remote = 1;
	}

	return idc;
}

static void osd_idc_dump_lma(const struct lu_env *env,
				struct osd_device *osd,
				unsigned long ino,
				bool check_in_oi)
{
	struct osd_thread_info *info = osd_oti_get(env);
	struct lustre_ost_attrs *loa = &info->oti_ost_attrs;
	const struct lu_fid *fid;
	struct osd_inode_id lid;
	struct inode *inode;
	int rc;

	inode = osd_ldiskfs_iget(osd_sb(osd), ino);
	if (IS_ERR(inode)) {
		CERROR("%s: can't get inode %lu: rc = %d\n",
		       osd->od_svname, ino, (int)PTR_ERR(inode));
		return;
	}
	if (is_bad_inode(inode)) {
		CERROR("%s: bad inode %lu\n", osd->od_svname, ino);
		goto put;
	}
	rc = osd_get_lma(info, inode, &info->oti_obj_dentry, loa);
	if (rc) {
		CERROR("%s: can't get LMA for %lu: rc = %d\n",
		       osd->od_svname, ino, rc);
		goto put;
	}
	fid = &loa->loa_lma.lma_self_fid;
	LCONSOLE(D_INFO, "%s: "DFID" in inode %lu/%u\n", osd->od_svname,
		      PFID(fid), ino, (unsigned)inode->i_generation);
	if (!check_in_oi)
		goto put;
	rc = osd_oi_lookup(osd_oti_get(env), osd, fid, &lid, 0);
	if (rc) {
		CERROR("%s: can't lookup "DFID": rc = %d\n",
		       osd->od_svname, PFID(fid), rc);
		goto put;
	}
	LCONSOLE(D_INFO, "%s: "DFID" maps to %u/%u\n", osd->od_svname,
		      PFID(fid), lid.oii_ino, lid.oii_gen);
put:
	iput(inode);
}

static void osd_idc_dump_debug(const struct lu_env *env,
				struct osd_device *osd,
				const struct lu_fid *fid,
				unsigned long ino1,
				unsigned long ino2)
{
	struct osd_inode_id lid;

	int rc;

	rc = osd_oi_lookup(osd_oti_get(env), osd, fid, &lid, 0);
	if (!rc) {
		LCONSOLE(D_INFO, "%s: "DFID" maps to %u/%u\n",
			osd->od_svname, PFID(fid), lid.oii_ino, lid.oii_gen);
		osd_idc_dump_lma(env, osd, lid.oii_ino, false);
	} else {
		CERROR("%s: can't lookup "DFID": rc = %d\n",
		       osd->od_svname, PFID(fid), rc);
	}
	if (ino1)
		osd_idc_dump_lma(env, osd, ino1, true);
	if (ino2)
		osd_idc_dump_lma(env, osd, ino2, true);
}

/*
 * lookup mapping for given FID and fill it from the given object.
 * the object is lolcal by definition.
 */
static int osd_idc_find_and_init(const struct lu_env *env,
				 struct osd_device *osd,
				 struct osd_object *obj)
{
	const struct lu_fid *fid = lu_object_fid(&obj->oo_dt.do_lu);
	struct osd_idmap_cache *idc;

	idc = osd_idc_find(env, osd, fid);
	LASSERT(!IS_ERR(idc));
	if (idc != NULL) {
		if (obj->oo_inode == NULL)
			return 0;
		if (idc->oic_lid.oii_ino != obj->oo_inode->i_ino) {
			if (idc->oic_lid.oii_ino) {
				osd_idc_dump_debug(env, osd, fid,
						   idc->oic_lid.oii_ino,
						   obj->oo_inode->i_ino);
				return -EINVAL;
			}
			idc->oic_lid.oii_ino = obj->oo_inode->i_ino;
			idc->oic_lid.oii_gen = obj->oo_inode->i_generation;
		}
		return 0;
	}

	CDEBUG(D_INODE, "%s: FID "DFID" not in the id map cache\n",
	       osd->od_svname, PFID(fid));

	/* new mapping is needed */
	idc = osd_idc_add(env, osd, fid);
	if (IS_ERR(idc)) {
		CERROR("%s: FID "DFID" add id map cache failed: %ld\n",
		       osd->od_svname, PFID(fid), PTR_ERR(idc));
		return PTR_ERR(idc);
	}

	if (obj->oo_inode != NULL) {
		idc->oic_lid.oii_ino = obj->oo_inode->i_ino;
		idc->oic_lid.oii_gen = obj->oo_inode->i_generation;
	}
	return 0;
}

/*
 * OSD object methods.
 */

/*
 * Concurrency: no concurrent access is possible that early in object
 * life-cycle.
 */
static struct lu_object *osd_object_alloc(const struct lu_env *env,
					  const struct lu_object_header *hdr,
					  struct lu_device *d)
{
	struct osd_object *mo;

	OBD_ALLOC_PTR(mo);
	if (mo != NULL) {
		struct lu_object *l;
		struct lu_object_header *h;
		struct osd_device *o = osd_dev(d);

		l = &mo->oo_dt.do_lu;
		if (unlikely(o->od_in_init)) {
			OBD_ALLOC_PTR(h);
			if (!h) {
				OBD_FREE_PTR(mo);
				return NULL;
			}

			lu_object_header_init(h);
			lu_object_init(l, h, d);
			lu_object_add_top(h, l);
			mo->oo_header = h;
		} else {
			dt_object_init(&mo->oo_dt, NULL, d);
			mo->oo_header = NULL;
		}

		mo->oo_dt.do_ops = &osd_obj_ops;
		l->lo_ops = &osd_lu_obj_ops;
		init_rwsem(&mo->oo_sem);
		init_rwsem(&mo->oo_ext_idx_sem);
		spin_lock_init(&mo->oo_guard);
		INIT_LIST_HEAD(&mo->oo_xattr_list);
		return l;
	}
	return NULL;
}

int osd_get_lma(struct osd_thread_info *info, struct inode *inode,
		struct dentry *dentry, struct lustre_ost_attrs *loa)
{
	int rc;

	rc = __osd_xattr_get(inode, dentry, XATTR_NAME_LMA,
			     (void *)loa, sizeof(*loa));
	if (rc > 0) {
		struct lustre_mdt_attrs *lma = &loa->loa_lma;

		if (rc < sizeof(*lma))
			return -EINVAL;

		rc = 0;
		lustre_loa_swab(loa, true);
		/* Check LMA compatibility */
		if (lma->lma_incompat & ~LMA_INCOMPAT_SUPP) {
			rc = -EOPNOTSUPP;
			CWARN("%s: unsupported incompat LMA feature(s) %#x for fid = "DFID", ino = %lu: rc = %d\n",
			      osd_ino2name(inode),
			      lma->lma_incompat & ~LMA_INCOMPAT_SUPP,
			      PFID(&lma->lma_self_fid), inode->i_ino, rc);
		}
	} else if (rc == 0) {
		rc = -ENODATA;
	}

	return rc;
}

/*
 * retrieve object from backend ext fs.
 **/
static struct inode *osd_iget2(struct osd_thread_info *info,
			       struct osd_device *dev, struct osd_inode_id *id,
			       int *err)
{
	int rc = 0;
	struct inode *inode = NULL;

	/*
	 * if we look for an inode withing a running
	 * transaction, then we risk to deadlock
	 * osd_dirent_check_repair() breaks this
	 */
	 /* LASSERT(current->journal_info == NULL); */

	inode = osd_ldiskfs_iget(osd_sb(dev), id->oii_ino);
	if (IS_ERR(inode)) {
		CDEBUG(D_INODE, "no inode: ino = %u, rc = %ld\n",
		       id->oii_ino, PTR_ERR(inode));
	} else if (id->oii_gen != OSD_OII_NOGEN &&
		   inode->i_generation != id->oii_gen) {
		CDEBUG(D_INODE, "unmatched inode: ino = %u, oii_gen = %u, "
		       "i_generation = %u\n",
		       id->oii_ino, id->oii_gen, inode->i_generation);
		rc = -ESTALE;
	} else if (inode->i_nlink == 0) {
		/*
		 * due to parallel readdir and unlink,
		 * we can have dead inode here.
		 */
		CDEBUG(D_INODE, "stale inode: ino = %u\n", id->oii_ino);
		rc = -ESTALE;
	} else if (is_bad_inode(inode)) {
		CWARN("%s: bad inode: ino = %u: rc = %d\n",
		      osd_dev2name(dev), id->oii_ino, -ENOENT);
		rc = -ENOENT;
	} else  if (osd_is_ea_inode(inode)) {
		/*
		 * EA inode is internal ldiskfs object, should don't visible
		 * on osd
		 */
		CDEBUG(D_INODE, "EA inode: ino = %u\n", id->oii_ino);
		rc = -ENOENT;
	} else if ((rc = osd_attach_jinode(inode))) {
		CDEBUG(D_INODE, "jbd: ino = %u rc = %d\n", id->oii_ino, rc);
	} else {
		ldiskfs_clear_inode_state(inode, LDISKFS_STATE_LUSTRE_DESTROY);
		if (id->oii_gen == OSD_OII_NOGEN)
			osd_id_gen(id, inode->i_ino, inode->i_generation);

		/*
		 * Do not update file c/mtime in ldiskfs.
		 * NB: we don't have any lock to protect this because we don't
		 * have reference on osd_object now, but contention with
		 * another lookup + attr_set can't happen in the tiny window
		 * between if (...) and set S_NOCMTIME.
		 */
		if (!(inode->i_flags & S_NOCMTIME))
			inode->i_flags |= S_NOCMTIME;
	}

	*err = rc;

	return inode;
}

struct inode *osd_iget(struct osd_thread_info *info, struct osd_device *dev,
		       struct osd_inode_id *id)
{
	struct inode *inode;
	int rc = 0;

	inode = osd_iget2(info, dev, id, &rc);

	if (rc) {
		iput(inode);
		inode = ERR_PTR(rc);
	}

	return inode;
}

int osd_ldiskfs_add_entry(struct osd_thread_info *info, struct osd_device *osd,
			  handle_t *handle, struct dentry *child,
			  struct inode *inode, struct htree_lock *hlock)
{
	int rc, rc2;

	rc = __ldiskfs_add_entry(handle, child, inode, hlock);
	if (rc == -ENOBUFS || rc == -ENOSPC) {
		struct lustre_ost_attrs *loa = &info->oti_ost_attrs;
		struct inode *parent = child->d_parent->d_inode;
		struct lu_fid *fid = NULL;
		char fidstr[FID_LEN + 1] = "unknown";

		rc2 = osd_get_lma(info, parent, child->d_parent, loa);
		if (!rc2) {
			fid = &loa->loa_lma.lma_self_fid;
		} else if (rc2 == -ENODATA) {
			if (unlikely(is_root_inode(parent))) {
				fid = &info->oti_fid3;
				lu_local_obj_fid(fid, OSD_FS_ROOT_OID);
			} else if (!osd->od_is_ost && osd->od_index == 0) {
				fid = &info->oti_fid3;
				lu_igif_build(fid, parent->i_ino,
					      parent->i_generation);
			}
		}

		if (fid != NULL)
			snprintf(fidstr, sizeof(fidstr), DFID, PFID(fid));

		/* below message is checked in sanity.sh test_129 */
		if (rc == -ENOSPC) {
			CWARN("%s: directory (inode: %lu, FID: %s) has reached max size limit\n",
			      osd_name(osd), parent->i_ino, fidstr);
		} else {
			rc = 0;	/* ignore such error now */
			CWARN("%s: directory (inode: %lu, FID: %s) is approaching max size limit\n",
			      osd_name(osd), parent->i_ino, fidstr);
		}

	}

	return rc;
}


struct inode *
osd_iget_fid(struct osd_thread_info *info, struct osd_device *dev,
	     struct osd_inode_id *id, struct lu_fid *fid)
{
	struct lustre_ost_attrs *loa = &info->oti_ost_attrs;
	struct inode *inode;
	int rc;

	inode = osd_iget(info, dev, id);
	if (IS_ERR(inode))
		return inode;

	rc = osd_get_lma(info, inode, &info->oti_obj_dentry, loa);
	if (!rc) {
		*fid = loa->loa_lma.lma_self_fid;
	} else if (rc == -ENODATA) {
		if (unlikely(is_root_inode(inode)))
			lu_local_obj_fid(fid, OSD_FS_ROOT_OID);
		else
			lu_igif_build(fid, inode->i_ino, inode->i_generation);
	} else {
		iput(inode);
		inode = ERR_PTR(rc);
	}
	return inode;
}

static struct inode *osd_iget_check(struct osd_thread_info *info,
				    struct osd_device *dev,
				    const struct lu_fid *fid,
				    struct osd_inode_id *id,
				    bool trusted)
{
	struct inode *inode;
	int rc = 0;

	ENTRY;

	/*
	 * The cached OI mapping is trustable. If we cannot locate the inode
	 * via the cached OI mapping, then return the failure to the caller
	 * directly without further OI checking.
	 */

again:
	inode = osd_iget2(info, dev, id, &rc);
	if (rc) {
		if (!trusted && (rc == -ENOENT || rc == -ESTALE))
			goto check_oi;

		CDEBUG(D_INODE, "no inode for FID: "DFID", ino = %u, rc = %d\n",
		       PFID(fid), id->oii_ino, rc);
		GOTO(put, rc);
	}

check_oi:
	if (rc != 0) {
		__u32 saved_ino = id->oii_ino;
		__u32 saved_gen = id->oii_gen;

		LASSERT(!trusted);
		LASSERTF(rc == -ESTALE || rc == -ENOENT, "rc = %d\n", rc);

		rc = osd_oi_lookup(info, dev, fid, id, OI_CHECK_FLD);
		/*
		 * XXX: There are four possible cases:
		 *	1. rc = 0.
		 *	   Backup/restore caused the OI invalid.
		 *	2. rc = 0.
		 *	   Someone unlinked the object but NOT removed
		 *	   the OI mapping, such as mount target device
		 *	   as ldiskfs, and modify something directly.
		 *	3. rc = -ENOENT.
		 *	   Someone just removed the object between the
		 *	   former oi_lookup and the iget. It is normal.
		 *	4. Other failure cases.
		 *
		 *	Generally, when the device is mounted, it will
		 *	auto check whether the system is restored from
		 *	file-level backup or not. We trust such detect
		 *	to distinguish the 1st case from the 2nd case:
		 *	if the OI files are consistent but may contain
		 *	stale OI mappings because of case 2, if iget()
		 *	returns -ENOENT or -ESTALE, then it should be
		 *	the case 2.
		 */
		if (rc != 0)
			/*
			 * If the OI mapping was in OI file before the
			 * osd_iget_check(), but now, it is disappear,
			 * then it must be removed by race. That is a
			 * normal race case.
			 */
			GOTO(put, rc);

		/*
		 * It is the OI scrub updated the OI mapping by race.
		 * The new OI mapping must be valid.
		 */
		if (saved_ino != id->oii_ino ||
		    (saved_gen != id->oii_gen && saved_gen != OSD_OII_NOGEN)) {
			if (!IS_ERR(inode))
				iput(inode);

			trusted = true;
			goto again;
		}

		if (IS_ERR(inode)) {
			if (dev->od_scrub.os_scrub.os_file.sf_flags &
			    SF_INCONSISTENT)
				/*
				 * It still can be the case 2, but we cannot
				 * distinguish it from the case 1. So return
				 * -EREMCHG to block current operation until
				 *  OI scrub rebuilt the OI mappings.
				 */
				rc = -EREMCHG;
			else
				rc = -ENOENT;

			GOTO(put, rc);
		}

		if (inode->i_generation == id->oii_gen)
			rc = -ENOENT;
		else
			rc = -EREMCHG;
	}

	GOTO(put, rc);

put:
	if (rc != 0) {
		if (!IS_ERR(inode))
			iput(inode);

		inode = ERR_PTR(rc);
	}

	return inode;
}

/**
 * \retval +v: new filter_fid does not contain self-fid
 * \retval 0:  filter_fid_18_23, contains self-fid
 * \retval -v: other failure cases
 */
int osd_get_idif(struct osd_thread_info *info, struct inode *inode,
		 struct dentry *dentry, struct lu_fid *fid)
{
	struct filter_fid *ff = &info->oti_ff;
	struct ost_id *ostid = &info->oti_ostid;
	int rc;

	rc = __osd_xattr_get(inode, dentry, XATTR_NAME_FID, ff, sizeof(*ff));
	if (rc == sizeof(struct filter_fid_18_23)) {
		struct filter_fid_18_23 *ff_old = (void *)ff;

		ostid_set_seq(ostid, le64_to_cpu(ff_old->ff_seq));
		rc = ostid_set_id(ostid, le64_to_cpu(ff_old->ff_objid));
		/*
		 * XXX: use 0 as the index for compatibility, the caller will
		 * handle index related issues when necessary.
		 */
		if (!rc)
			ostid_to_fid(fid, ostid, 0);
	} else if (rc >= (int)sizeof(struct filter_fid_24_29)) {
		rc = 1;
	} else if (rc >= 0) {
		rc = -EINVAL;
	}

	return rc;
}

static int osd_lma_self_repair(struct osd_thread_info *info,
			       struct osd_device *osd, struct inode *inode,
			       const struct lu_fid *fid, __u32 compat)
{
	handle_t *jh;
	int rc;

	LASSERT(current->journal_info == NULL);

	jh = osd_journal_start_sb(osd_sb(osd), LDISKFS_HT_MISC,
				  osd_dto_credits_noquota[DTO_XATTR_SET]);
	if (IS_ERR(jh)) {
		rc = PTR_ERR(jh);
		CWARN("%s: cannot start journal for lma_self_repair: rc = %d\n",
		      osd_name(osd), rc);
		return rc;
	}

	rc = osd_ea_fid_set(info, inode, fid, compat, 0);
	if (rc != 0)
		CWARN("%s: cannot self repair the LMA: rc = %d\n",
		      osd_name(osd), rc);
	ldiskfs_journal_stop(jh);
	return rc;
}

static int osd_check_lma(const struct lu_env *env, struct osd_object *obj)
{
	struct osd_thread_info *info = osd_oti_get(env);
	struct osd_device *osd = osd_obj2dev(obj);
	struct lustre_ost_attrs *loa = &info->oti_ost_attrs;
	struct lustre_mdt_attrs *lma = &loa->loa_lma;
	struct inode *inode = obj->oo_inode;
	struct dentry *dentry = &info->oti_obj_dentry;
	struct lu_fid *fid = NULL;
	const struct lu_fid *rfid = lu_object_fid(&obj->oo_dt.do_lu);
	int rc;

	ENTRY;

	rc = __osd_xattr_get(inode, dentry, XATTR_NAME_LMA,
			     (void *)loa, sizeof(*loa));
	if (rc == -ENODATA && !fid_is_igif(rfid) && osd->od_check_ff) {
		fid = &lma->lma_self_fid;
		rc = osd_get_idif(info, inode, dentry, fid);
		if (rc > 0 || (rc == -ENODATA && osd->od_index_in_idif)) {
			/*
			 * For the given OST-object, if it has neither LMA nor
			 * FID in XATTR_NAME_FID, then the given FID (which is
			 * contained in the @obj, from client RPC for locating
			 * the OST-object) is trusted. We use it to generate
			 * the LMA.
			 */
			osd_lma_self_repair(info, osd, inode, rfid,
					    LMAC_FID_ON_OST);
			RETURN(0);
		}
	}

	if (rc < 0)
		RETURN(rc);

	if (rc > 0) {
		rc = 0;
		lustre_lma_swab(lma);
		if (unlikely((lma->lma_incompat & ~LMA_INCOMPAT_SUPP) ||
			     (CFS_FAIL_CHECK(OBD_FAIL_OSD_LMA_INCOMPAT) &&
			      S_ISREG(inode->i_mode)))) {
			CWARN("%s: unsupported incompat LMA feature(s) %#x for "
			      "fid = "DFID", ino = %lu\n", osd_name(osd),
			      lma->lma_incompat & ~LMA_INCOMPAT_SUPP,
			      PFID(rfid), inode->i_ino);
			rc = -EOPNOTSUPP;
		} else {
			fid = &lma->lma_self_fid;
			if (lma->lma_compat & LMAC_STRIPE_INFO &&
			    osd->od_is_ost)
				obj->oo_pfid_in_lma = 1;
			if (unlikely(lma->lma_incompat & LMAI_REMOTE_PARENT) &&
			    !osd->od_is_ost)
				lu_object_set_agent_entry(&obj->oo_dt.do_lu);
		}
	}

	if (fid != NULL && unlikely(!lu_fid_eq(rfid, fid))) {
		if (fid_is_idif(rfid) && fid_is_idif(fid)) {
			struct ost_id	*oi   = &info->oti_ostid;
			struct lu_fid	*fid1 = &info->oti_fid3;
			__u32		 idx  = fid_idif_ost_idx(rfid);

			/*
			 * For old IDIF, the OST index is not part of the IDIF,
			 * Means that different OSTs may have the same IDIFs.
			 * Under such case, we need to make some compatible
			 * check to make sure to trigger OI scrub properly.
			 */
			if (idx != 0 && fid_idif_ost_idx(fid) == 0) {
				/* Given @rfid is new, LMA is old. */
				fid_to_ostid(fid, oi);
				ostid_to_fid(fid1, oi, idx);
				if (lu_fid_eq(fid1, rfid)) {
					if (osd->od_index_in_idif)
						osd_lma_self_repair(info, osd,
							inode, rfid,
							LMAC_FID_ON_OST);
					RETURN(0);
				}
			}
		}

		rc = -EREMCHG;
	}

	RETURN(rc);
}

struct osd_check_lmv_buf {
	/* please keep it as first member */
	struct dir_context ctx;
	struct osd_thread_info *oclb_info;
	struct osd_device *oclb_dev;
	int oclb_items;
	bool oclb_found;
};

/**
 * It is called internally by ->iterate*() to filter out the
 * local slave object's FID of the striped directory.
 *
 * \retval	1 found the local slave's FID
 * \retval	0 continue to check next item
 * \retval	-ve for failure
 */
#ifdef HAVE_FILLDIR_USE_CTX
static FILLDIR_TYPE do_osd_stripe_dir_filldir(struct dir_context *buf,
#else
static int osd_stripe_dir_filldir(void *buf,
#endif
				  const char *name, int namelen,
				  loff_t offset, __u64 ino, unsigned int d_type)
{
	struct osd_check_lmv_buf *oclb = (struct osd_check_lmv_buf *)buf;
	struct osd_thread_info *oti = oclb->oclb_info;
	struct lu_fid *fid = &oti->oti_fid3;
	struct osd_inode_id *id = &oti->oti_id3;
	struct osd_device *dev = oclb->oclb_dev;
	struct inode *inode;

	oclb->oclb_items++;

	if (name[0] == '.')
		return 0;

	fid_zero(fid);
	sscanf(name + 1, SFID, RFID(fid));
	if (!fid_is_sane(fid))
		return 0;

	if (osd_remote_fid(oti->oti_env, dev, fid))
		return 0;

	osd_id_gen(id, ino, OSD_OII_NOGEN);
	inode = osd_iget(oti, dev, id);
	if (IS_ERR(inode))
		return PTR_ERR(inode);

	iput(inode);
	osd_add_oi_cache(oti, dev, id, fid);
	osd_scrub_oi_insert(dev, fid, id, true);
	oclb->oclb_found = true;

	return 1;
}

WRAP_FILLDIR_FN(do_, osd_stripe_dir_filldir)

/*
 * When lookup item under striped directory, we need to locate the master
 * MDT-object of the striped directory firstly, then the client will send
 * lookup (getattr_by_name) RPC to the MDT with some slave MDT-object's FID
 * and the item's name. If the system is restored from MDT file level backup,
 * then before the OI scrub completely built the OI files, the OI mappings of
 * the master MDT-object and slave MDT-object may be invalid. Usually, it is
 * not a problem for the master MDT-object. Because when locate the master
 * MDT-object, we will do name based lookup (for the striped directory itself)
 * firstly, during such process we can setup the correct OI mapping for the
 * master MDT-object. But it will be trouble for the slave MDT-object. Because
 * the client will not trigger name based lookup on the MDT to locate the slave
 * MDT-object before locating item under the striped directory, then when
 * osd_fid_lookup(), it will find that the OI mapping for the slave MDT-object
 * is invalid and does not know what the right OI mapping is, then the MDT has
 * to return -EINPROGRESS to the client to notify that the OI scrub is rebuiding
 * the OI file, related OI mapping is unknown yet, please try again later. And
 * then client will re-try the RPC again and again until related OI mapping has
 * been updated. That is quite inefficient.
 *
 * To resolve above trouble, we will handle it as the following two cases:
 *
 * 1) The slave MDT-object and the master MDT-object are on different MDTs.
 *    It is relative easy. Be as one of remote MDT-objects, the slave MDT-object
 *    is linked under /REMOTE_PARENT_DIR with the name of its FID string.
 *    We can locate the slave MDT-object via lookup the /REMOTE_PARENT_DIR
 *    directly. Please check osd_fid_lookup().
 *
 * 2) The slave MDT-object and the master MDT-object reside on the same MDT.
 *    Under such case, during lookup the master MDT-object, we will lookup the
 *    slave MDT-object via readdir against the master MDT-object, because the
 *    slave MDT-objects information are stored as sub-directories with the name
 *    "${FID}:${index}". Then when find the local slave MDT-object, its OI
 *    mapping will be recorded. Then subsequent osd_fid_lookup() will know
 *    the correct OI mapping for the slave MDT-object.
 */
static int osd_check_lmv(struct osd_thread_info *oti, struct osd_device *dev,
			 struct inode *inode)
{
	struct lu_buf *buf = &oti->oti_big_buf;
	struct file *filp;
	struct lmv_mds_md_v1 *lmv1;
	struct osd_check_lmv_buf oclb = {
		.ctx.actor = osd_stripe_dir_filldir,
		.oclb_info = oti,
		.oclb_dev = dev,
		.oclb_found = false,
	};
	int rc = 0;

	ENTRY;
	/* We should use the VFS layer to create a real dentry. */
	oti->oti_obj_dentry.d_inode = inode;
	oti->oti_obj_dentry.d_sb = inode->i_sb;

	filp = alloc_file_pseudo(inode, dev->od_mnt, "/", O_NOATIME,
				 inode->i_fop);
	if (IS_ERR(filp))
		RETURN(-ENOMEM);

	filp->f_mode |= FMODE_64BITHASH;
	filp->f_pos = 0;
	ihold(inode);
again:
	rc = __osd_xattr_get(inode, filp->f_path.dentry, XATTR_NAME_LMV,
			     buf->lb_buf, buf->lb_len);
	if (rc == -ERANGE) {
		rc = __osd_xattr_get(inode, filp->f_path.dentry,
				     XATTR_NAME_LMV, NULL, 0);
		if (rc > 0) {
			lu_buf_realloc(buf, rc);
			if (buf->lb_buf == NULL)
				GOTO(out, rc = -ENOMEM);

			goto again;
		}
	}

	if (unlikely(rc == 0 || rc == -ENODATA))
		GOTO(out, rc = 0);

	if (rc < 0)
		GOTO(out, rc);

	if (unlikely(buf->lb_buf == NULL)) {
		lu_buf_realloc(buf, rc);
		if (buf->lb_buf == NULL)
			GOTO(out, rc = -ENOMEM);

		goto again;
	}

	lmv1 = buf->lb_buf;
	if (le32_to_cpu(lmv1->lmv_magic) != LMV_MAGIC_V1)
		GOTO(out, rc = 0);

	do {
		oclb.oclb_items = 0;
		rc = iterate_dir(filp, &oclb.ctx);
	} while (rc >= 0 && oclb.oclb_items > 0 && !oclb.oclb_found &&
		 filp->f_pos != LDISKFS_HTREE_EOF_64BIT);
out:
	fput(filp);
	if (rc < 0)
		CDEBUG(D_LFSCK,
		       "%s: cannot check LMV, ino = %lu/%u: rc = %d\n",
		       osd_ino2name(inode), inode->i_ino, inode->i_generation,
		       rc);
	else
		rc = 0;

	RETURN(rc);
}

/**
 * Is object in scrub inconsistent/stale list.
 *
 * \a scrub has two lists, os_inconsistent_items contains mappings to fix, while
 * os_stale_items contains mappings failed to fix.
 */
static bool fid_in_scrub_list(struct lustre_scrub *scrub,
			      const struct list_head *list,
			      const struct lu_fid *fid)
{
	struct osd_inconsistent_item *oii;

	if (list_empty(list))
		return false;

	spin_lock(&scrub->os_lock);
	list_for_each_entry(oii, list, oii_list) {
		if (lu_fid_eq(fid, &oii->oii_cache.oic_fid)) {
			spin_unlock(&scrub->os_lock);
			return true;
		}
	}
	spin_unlock(&scrub->os_lock);

	return false;
}

static int osd_fid_lookup(const struct lu_env *env, struct osd_object *obj,
			  const struct lu_fid *fid,
			  const struct lu_object_conf *conf)
{
	struct osd_thread_info *info;
	struct lu_device *ldev = obj->oo_dt.do_lu.lo_dev;
	struct osd_device *dev;
	struct osd_idmap_cache *oic;
	struct osd_inode_id *id;
	struct inode *inode = NULL;
	struct lustre_scrub *scrub;
	struct scrub_file *sf;
	__u32 flags = SS_CLEAR_DRYRUN | SS_CLEAR_FAILOUT | SS_AUTO_FULL;
	__u32 saved_ino;
	__u32 saved_gen;
	int result = 0;
	int rc1 = 0;
	bool remote = false;
	bool trusted = true;
	bool updated = false;
	bool checked = false;
	bool stale = false;

	ENTRY;

	LINVRNT(osd_invariant(obj));
	LASSERT(obj->oo_inode == NULL);

	if (fid_is_sane(fid) == 0) {
		CERROR("%s: invalid FID "DFID"\n", ldev->ld_obd->obd_name,
		       PFID(fid));
		dump_stack();
		RETURN(-EINVAL);
	}

	dev = osd_dev(ldev);
	scrub = &dev->od_scrub.os_scrub;
	sf = &scrub->os_file;
	info = osd_oti_get(env);
	LASSERT(info);
	oic = &info->oti_cache;

	if (CFS_FAIL_CHECK(OBD_FAIL_SRV_ENOENT))
		RETURN(-ENOENT);

	/*
	 * For the object is created as locking anchor, or for the object to
	 * be created on disk. No need to osd_oi_lookup() at here because FID
	 * shouldn't never be re-used, if it's really a duplicate FID from
	 * unexpected reason, we should be able to detect it later by calling
	 * do_create->osd_oi_insert().
	 */
	if (conf && conf->loc_flags & LOC_F_NEW)
		RETURN(0);

	/* Search order: 1. per-thread cache. */
	if (lu_fid_eq(fid, &oic->oic_fid) && likely(oic->oic_dev == dev)) {
		id = &oic->oic_lid;
		goto iget;
	}

	/* Search order: 2. OI scrub pending list. */
	id = &info->oti_id;
	memset(id, 0, sizeof(struct osd_inode_id));
	if (fid_in_scrub_list(scrub, &scrub->os_inconsistent_items, fid) &&
	    scrub->os_running)
		RETURN(-EINPROGRESS);

	stale = fid_in_scrub_list(scrub, &scrub->os_stale_items, fid);
	if (stale && CFS_FAIL_CHECK(OBD_FAIL_OSD_SCRUB_STALE))
		RETURN(-ESTALE);

	/*
	 * The OI mapping in the OI file can be updated by the OI scrub
	 * when we locate the inode via FID. So it may be not trustable.
	 */
	trusted = false;

	/* Search order: 3. OI files. */
	result = osd_oi_lookup(info, dev, fid, id, OI_CHECK_FLD);
	if (result == -ENOENT) {
		if (!fid_is_norm(fid) ||
		    fid_is_on_ost(info, dev, fid, OI_CHECK_FLD) ||
		    !ldiskfs_test_bit(osd_oi_fid2idx(dev, fid),
				      sf->sf_oi_bitmap))
			GOTO(out, result = 0);

		goto trigger;
	}

	/* -ESTALE is returned if inode of OST object doesn't exist */
	if (result == -ESTALE &&
	    fid_is_on_ost(info, dev, fid, OI_CHECK_FLD)) {
		GOTO(out, result = 0);
	}

	if (result)
		GOTO(out, result);

iget:
	obj->oo_inode = NULL;
	/* for later passes through checks, not true on first pass */
	if (!IS_ERR_OR_NULL(inode))
		iput(inode);

	inode = osd_iget_check(info, dev, fid, id, trusted);
	if (!IS_ERR(inode)) {
		obj->oo_inode = inode;
		result = 0;
		if (remote)
			goto trigger;

		goto check_lma;
	}

	if (CFS_FAIL_CHECK(OBD_FAIL_OSD_SCRUB_STALE))
		goto trigger;

	result = PTR_ERR(inode);
	if (result == -ENOENT || result == -ESTALE)
		GOTO(out, result = 0);

	if (result != -EREMCHG)
		GOTO(out, result);

trigger:
	/* don't trigger repeatedly for stale mapping */
	if (stale)
		GOTO(out, result = -ESTALE);

	/*
	 * We still have chance to get the valid inode: for the
	 * object which is referenced by remote name entry, the
	 * object on the local MDT will be linked under the dir
	 * of "/REMOTE_PARENT_DIR" with its FID string as name.
	 *
	 * We do not know whether the object for the given FID
	 * is referenced by some remote name entry or not, and
	 * especially for DNE II, a multiple-linked object may
	 * have many name entries reside on many MDTs.
	 *
	 * To simplify the operation, OSD will not distinguish
	 * more, just lookup "/REMOTE_PARENT_DIR". Usually, it
	 * only happened for the RPC from other MDT during the
	 * OI scrub, or for the client side RPC with FID only,
	 * such as FID to path, or from old connected client.
	 */
	if (!remote) {
		rc1 = osd_lookup_in_remote_parent(info, dev, fid, id);
		if (!rc1) {
			remote = true;
			trusted = true;
			flags |= SS_AUTO_PARTIAL;
			flags &= ~SS_AUTO_FULL;
			goto iget;
		}
	}

	if (scrub->os_running) {
		if (scrub->os_partial_scan && !scrub->os_in_join)
			goto join;

		if (IS_ERR_OR_NULL(inode) || result) {
			osd_scrub_oi_insert(dev, fid, id, result == -ENOENT);
			GOTO(out, result = -EINPROGRESS);
		}

		LASSERT(remote);
		LASSERT(obj->oo_inode == inode);

		osd_scrub_oi_insert(dev, fid, id, true);
		goto found;
	}

	if (dev->od_scrub.os_scrub.os_auto_scrub_interval == AS_NEVER) {
		if (!remote)
			GOTO(out, result = -EREMCHG);

		LASSERT(!result);
		LASSERT(obj->oo_inode == inode);

		osd_add_oi_cache(info, dev, id, fid);
		goto found;
	}

join:
	if (IS_ERR_OR_NULL(inode) || result)
		osd_scrub_oi_insert(dev, fid, id, result == -ENOENT);

	rc1 = osd_scrub_start(env, dev, flags);
	CDEBUG_LIMIT(D_LFSCK | D_CONSOLE | D_WARNING,
		     "%s: trigger OI scrub by RPC for "DFID"/%u with flags %#x: rc = %d\n",
		     osd_name(dev), PFID(fid), id->oii_ino, flags, rc1);
	if (rc1 && rc1 != -EALREADY)
		GOTO(out, result = -EREMCHG);

	if (IS_ERR_OR_NULL(inode) || result)
		GOTO(out, result = -EINPROGRESS);

	LASSERT(remote);
	LASSERT(obj->oo_inode == inode);
	goto found;

check_lma:
	checked = true;
	if (unlikely(obj->oo_header))
		goto found;

	result = osd_check_lma(env, obj);
	if (!result)
		goto found;

	LASSERTF(id->oii_ino == inode->i_ino &&
		 id->oii_gen == inode->i_generation,
		 "locate wrong inode for FID: "DFID", %u/%u => %ld/%u\n",
		 PFID(fid), id->oii_ino, id->oii_gen,
		 inode->i_ino, inode->i_generation);

	saved_ino = inode->i_ino;
	saved_gen = inode->i_generation;

	if (unlikely(result == -ENODATA)) {
		/*
		 * If the OI scrub updated the OI mapping by race, it
		 * must be valid. Trust the inode that has no LMA EA.
		 */
		if (updated)
			goto found;

		result = osd_oi_lookup(info, dev, fid, id, OI_CHECK_FLD);
		if (!result) {
			/*
			 * The OI mapping is still there, the inode is still
			 * valid. It is just becaues the inode has no LMA EA.
			 */
			if (saved_ino == id->oii_ino &&
			    saved_gen == id->oii_gen)
				goto found;

			/*
			 * It is the OI scrub updated the OI mapping by race.
			 * The new OI mapping must be valid.
			 */
			trusted = true;
			updated = true;
			goto iget;
		}

		/*
		 * "result == -ENOENT" means that the OI mappinghas been
		 * removed by race, so the inode belongs to other object.
		 *
		 * Others error can be returned  directly.
		 */
		if (result == -ENOENT) {
			LASSERT(trusted);

			obj->oo_inode = NULL;
			result = 0;
		}
	}

	if (result != -EREMCHG)
		GOTO(out, result);

	LASSERT(!updated);

	/*
	 * if two OST objects map to the same inode, and inode mode is
	 * (S_IFREG | S_ISUID | S_ISGID | S_ISVTX | 0666), which means it's
	 * reserved by precreate, and not written yet, in this case, don't
	 * set inode for the object whose FID mismatch, so that it can create
	 * inode and not block precreate.
	 */
	if (fid_is_on_ost(info, dev, fid, OI_CHECK_FLD) &&
	    inode->i_mode == (S_IFREG | S_ISUID | S_ISGID | S_ISVTX | 0666)) {
		obj->oo_inode = NULL;
		GOTO(out, result = 0);
	}

	result = osd_oi_lookup(info, dev, fid, id, OI_CHECK_FLD);
	/*
	 * "result == -ENOENT" means the cached OI mapping has been removed
	 * from the OI file by race, above inode belongs to other object.
	 */
	if (result == -ENOENT) {
		LASSERT(trusted);

		obj->oo_inode = NULL;
		GOTO(out, result = 0);
	}

	if (result)
		GOTO(out, result);

	if (saved_ino == id->oii_ino && saved_gen == id->oii_gen) {
		result = -EREMCHG;
		osd_scrub_refresh_mapping(info, dev, fid, id, DTO_INDEX_DELETE,
					  true, 0, NULL);
		goto trigger;
	}

	/*
	 * It is the OI scrub updated the OI mapping by race.
	 * The new OI mapping must be valid.
	 */
	trusted = true;
	updated = true;
	goto iget;

found:
	if (!checked) {
		struct lustre_ost_attrs *loa = &info->oti_ost_attrs;
		struct lustre_mdt_attrs *lma = &info->oti_ost_attrs.loa_lma;

		result = osd_get_lma(info, inode, &info->oti_obj_dentry, loa);
		if (!result) {
			if (lma->lma_compat & LMAC_STRIPE_INFO &&
			    dev->od_is_ost)
				obj->oo_pfid_in_lma = 1;
			if (unlikely(lma->lma_incompat & LMAI_REMOTE_PARENT) &&
			    !dev->od_is_ost)
				lu_object_set_agent_entry(&obj->oo_dt.do_lu);
		} else if (result != -ENODATA) {
			GOTO(out, result);
		}
	}

	obj->oo_compat_dot_created = 1;
	obj->oo_compat_dotdot_created = 1;

	if (S_ISDIR(inode->i_mode) &&
	    (flags & SS_AUTO_PARTIAL || sf->sf_status == SS_SCANNING))
		osd_check_lmv(info, dev, inode);

	result = osd_attach_jinode(inode);
	if (result)
		GOTO(out, result);

	if (!ldiskfs_pdo)
		GOTO(out, result = 0);

	LASSERT(!obj->oo_hl_head);
	obj->oo_hl_head = ldiskfs_htree_lock_head_alloc(HTREE_HBITS_DEF);

	GOTO(out, result = (!obj->oo_hl_head ? -ENOMEM : 0));

out:
	if (!result && stale)
		osd_scrub_oi_resurrect(scrub, fid);

	if (result || !obj->oo_inode) {
		if (!IS_ERR_OR_NULL(inode))
			iput(inode);

		obj->oo_inode = NULL;
		if (trusted)
			fid_zero(&oic->oic_fid);
	}

	LINVRNT(osd_invariant(obj));
	return result;
}

/*
 * Concurrency: shouldn't matter.
 */
static void osd_object_init0(struct osd_object *obj)
{
	LASSERT(obj->oo_inode != NULL);
	obj->oo_dt.do_body_ops = &osd_body_ops;
	obj->oo_dt.do_lu.lo_header->loh_attr |=
		(LOHA_EXISTS | (obj->oo_inode->i_mode & S_IFMT));
}

/*
 * Concurrency: no concurrent access is possible that early in object
 * life-cycle.
 */
static int osd_object_init(const struct lu_env *env, struct lu_object *l,
			   const struct lu_object_conf *conf)
{
	struct osd_object *obj = osd_obj(l);
	int result;

	LINVRNT(osd_invariant(obj));

	if (CFS_FAIL_PRECHECK(OBD_FAIL_MDS_LLOG_UMOUNT_RACE) &&
	    cfs_fail_val == 2) {
		struct osd_thread_info *info = osd_oti_get(env);
		struct osd_idmap_cache *oic = &info->oti_cache;
		/* invalidate thread cache */
		memset(&oic->oic_fid, 0, sizeof(oic->oic_fid));
	}
	if (fid_is_otable_it(&l->lo_header->loh_fid)) {
		obj->oo_dt.do_ops = &osd_obj_otable_it_ops;
		l->lo_header->loh_attr |= LOHA_EXISTS;
		return 0;
	}

	result = osd_fid_lookup(env, obj, lu_object_fid(l), conf);
	obj->oo_dt.do_body_ops = &osd_body_ops_new;
	if (result == 0 && obj->oo_inode != NULL) {
		struct osd_thread_info *oti = osd_oti_get(env);
		struct lustre_ost_attrs *loa = &oti->oti_ost_attrs;

		osd_object_init0(obj);
		if (unlikely(obj->oo_header))
			return 0;

		result = osd_get_lma(oti, obj->oo_inode,
				     &oti->oti_obj_dentry, loa);
		if (!result) {
			/*
			 * Convert LMAI flags to lustre LMA flags
			 * and cache it to oo_lma_flags
			 */
			obj->oo_lma_flags =
				lma_to_lustre_flags(loa->loa_lma.lma_incompat);
		} else if (result == -ENODATA) {
			result = 0;
		}
	}
	obj->oo_dirent_count = LU_DIRENT_COUNT_UNSET;

	LINVRNT(osd_invariant(obj));
	return result;
}

/*
 * The first part of oxe_buf is xattr name, and is '\0' terminated.
 * The left part is for value, binary mode.
 */
struct osd_xattr_entry {
	struct list_head	oxe_list;
	size_t			oxe_len;
	size_t			oxe_namelen;
	bool			oxe_exist;
	struct rcu_head		oxe_rcu;
	char			oxe_buf[0];
};

static int osd_oxc_get(struct osd_object *obj, const char *name,
		       struct lu_buf *buf)
{
	struct osd_xattr_entry *tmp;
	struct osd_xattr_entry *oxe = NULL;
	size_t namelen = strlen(name);
	int rc;

	rcu_read_lock();
	list_for_each_entry_rcu(tmp, &obj->oo_xattr_list, oxe_list) {
		if (namelen == tmp->oxe_namelen &&
		    strncmp(name, tmp->oxe_buf, namelen) == 0) {
			oxe = tmp;
			break;
		}
	}

	if (oxe == NULL)
		GOTO(out, rc = -ENOENT);

	if (!oxe->oxe_exist)
		GOTO(out, rc = -ENODATA);

	/* vallen */
	rc = oxe->oxe_len - sizeof(*oxe) - oxe->oxe_namelen - 1;
	LASSERT(rc > 0);

	if (buf->lb_buf == NULL)
		GOTO(out, rc);

	if (buf->lb_len < rc)
		GOTO(out, rc = -ERANGE);

	memcpy(buf->lb_buf, &oxe->oxe_buf[namelen + 1], rc);
out:
	rcu_read_unlock();

	return rc;
}

static void osd_oxc_free(struct rcu_head *head)
{
	struct osd_xattr_entry *oxe;

	oxe = container_of(head, struct osd_xattr_entry, oxe_rcu);
	OBD_FREE(oxe, oxe->oxe_len);
}

static void osd_oxc_add(struct osd_object *obj, const char *name,
			const char *buf, int buflen)
{
	struct osd_xattr_entry *oxe;
	struct osd_xattr_entry *old = NULL;
	struct osd_xattr_entry *tmp;
	size_t namelen = strlen(name);
	size_t len = sizeof(*oxe) + namelen + 1 + buflen;

	OBD_ALLOC(oxe, len);
	if (oxe == NULL)
		return;

	INIT_LIST_HEAD(&oxe->oxe_list);
	oxe->oxe_len = len;
	oxe->oxe_namelen = namelen;
	memcpy(oxe->oxe_buf, name, namelen);
	if (buflen > 0) {
		LASSERT(buf != NULL);
		memcpy(oxe->oxe_buf + namelen + 1, buf, buflen);
		oxe->oxe_exist = true;
	} else {
		oxe->oxe_exist = false;
	}

	/* this should be rarely called, just remove old and add new */
	spin_lock(&obj->oo_guard);
	list_for_each_entry(tmp, &obj->oo_xattr_list, oxe_list) {
		if (namelen == tmp->oxe_namelen &&
		    strncmp(name, tmp->oxe_buf, namelen) == 0) {
			old = tmp;
			break;
		}
	}
	if (old != NULL) {
		list_replace_rcu(&old->oxe_list, &oxe->oxe_list);
		call_rcu(&old->oxe_rcu, osd_oxc_free);
	} else {
		list_add_tail_rcu(&oxe->oxe_list, &obj->oo_xattr_list);
	}
	spin_unlock(&obj->oo_guard);
}

static void osd_oxc_del(struct osd_object *obj, const char *name)
{
	struct osd_xattr_entry *oxe;
	size_t namelen = strlen(name);

	spin_lock(&obj->oo_guard);
	list_for_each_entry(oxe, &obj->oo_xattr_list, oxe_list) {
		if (namelen == oxe->oxe_namelen &&
		    strncmp(name, oxe->oxe_buf, namelen) == 0) {
			list_del_rcu(&oxe->oxe_list);
			call_rcu(&oxe->oxe_rcu, osd_oxc_free);
			break;
		}
	}
	spin_unlock(&obj->oo_guard);
}

static void osd_oxc_fini(struct osd_object *obj)
{
	struct osd_xattr_entry *oxe, *next;

	list_for_each_entry_safe(oxe, next, &obj->oo_xattr_list, oxe_list) {
		list_del(&oxe->oxe_list);
		OBD_FREE(oxe, oxe->oxe_len);
	}
}

/*
 * Concurrency: no concurrent access is possible that late in object
 * life-cycle.
 */
static void osd_object_free(const struct lu_env *env, struct lu_object *l)
{
	struct osd_object *obj = osd_obj(l);
	struct lu_object_header *h = obj->oo_header;

	LINVRNT(osd_invariant(obj));

	osd_oxc_fini(obj);
	dt_object_fini(&obj->oo_dt);
	if (obj->oo_hl_head != NULL)
		ldiskfs_htree_lock_head_free(obj->oo_hl_head);
	/* obj doesn't contain an lu_object_header, so we don't need call_rcu */
	OBD_FREE_PTR(obj);
	if (unlikely(h))
		lu_object_header_free(h);
}

/*
 * Concurrency: no concurrent access is possible that late in object
 * life-cycle.
 */
static void osd_index_fini(struct osd_object *o)
{
	struct iam_container *bag;

	if (o->oo_dir != NULL) {
		bag = &o->oo_dir->od_container;
		if (o->oo_inode != NULL) {
			if (bag->ic_object == o->oo_inode)
				iam_container_fini(bag);
		}
		OBD_FREE_PTR(o->oo_dir);
		o->oo_dir = NULL;
	}
}

enum {
	OSD_TXN_OI_DELETE_CREDITS    = 20,
	OSD_TXN_INODE_DELETE_CREDITS = 20
};

/*
 * Journal
 */

#if OSD_THANDLE_STATS
/**
 * Set time when the handle is allocated
 */
static void osd_th_alloced(struct osd_thandle *oth)
{
	oth->oth_alloced = ktime_get();
}

/**
 * Set time when the handle started
 */
static void osd_th_started(struct osd_thandle *oth)
{
	oth->oth_started = ktime_get();
}

/**
 * Check whether the we deal with this handle for too long.
 */
static void __osd_th_check_slow(void *oth, struct osd_device *dev,
				ktime_t alloced, ktime_t started,
				ktime_t closed)
{
	ktime_t now = ktime_get();

	LASSERT(dev != NULL);

	lprocfs_counter_add(dev->od_stats, LPROC_OSD_THANDLE_STARTING,
			    ktime_us_delta(started, alloced));
	lprocfs_counter_add(dev->od_stats, LPROC_OSD_THANDLE_OPEN,
			    ktime_us_delta(closed, started));
	lprocfs_counter_add(dev->od_stats, LPROC_OSD_THANDLE_CLOSING,
			    ktime_us_delta(now, closed));

	if (ktime_before(ktime_add_ns(alloced, 30 * NSEC_PER_SEC), now)) {
		CWARN("transaction handle %p was open for too long: now %lld, alloced %lld, started %lld, closed %lld\n",
				oth, now, alloced, started, closed);
		libcfs_debug_dumpstack(NULL);
	}
}

#define OSD_CHECK_SLOW_TH(oth, dev, expr)				\
{									\
	ktime_t __closed = ktime_get();					\
	ktime_t __alloced = oth->oth_alloced;				\
	ktime_t __started = oth->oth_started;				\
									\
	expr;								\
	__osd_th_check_slow(oth, dev, __alloced, __started, __closed);	\
}

#else /* OSD_THANDLE_STATS */

#define osd_th_alloced(h)                  do {} while(0)
#define osd_th_started(h)                  do {} while(0)
#define OSD_CHECK_SLOW_TH(oth, dev, expr)  expr

#endif /* OSD_THANDLE_STATS */

/*
 * in some cases (like overstriped files) the same operations on the same
 * objects are declared many times and this may lead to huge number of
 * credits which can be a problem and/or cause performance degradation.
 * this function is to remember what declarations have been made within
 * a given thandle and then skip duplications.
 * limit it's scope so that regular small transactions don't need all
 * this overhead with allocations, lists.
 * also, limit scope to the specific objects like llogs, etc.
 */
static inline bool osd_check_special_fid(const struct lu_fid *f)
{
	if (fid_seq_is_llog(f->f_seq))
		return true;
	if (f->f_seq == FID_SEQ_LOCAL_FILE &&
	    f->f_oid == MDD_LOV_OBJ_OID)
		return true;
	return false;
}

bool osd_tx_was_declared(const struct lu_env *env, struct osd_thandle *oth,
			 struct dt_object *dt, enum dt_txn_op op, loff_t pos)
{
	const struct lu_fid *fid = lu_object_fid(&dt->do_lu);
	struct osd_device *osd = osd_obj2dev(osd_dt_obj(dt));
	struct osd_thread_info *oti = osd_oti_get(env);
	struct osd_obj_declare *old;

	if (osd->od_is_ost)
		return false;

	/* small transactions don't need this overhead */
	if (oti->oti_declare_ops[DTO_OBJECT_CREATE] < 10 &&
	    oti->oti_declare_ops[DTO_WRITE_BASE] < 10)
		return false;

	if (osd_check_special_fid(fid) == 0)
		return false;

	list_for_each_entry(old, &oth->ot_declare_list, old_list) {
		if (old->old_op == op && old->old_pos == pos &&
		    lu_fid_eq(&old->old_fid, fid))
			return true;
	}
	OBD_ALLOC_PTR(old);
	if (unlikely(old == NULL))
		return false;
	old->old_fid = *lu_object_fid(&dt->do_lu);
	old->old_op = op;
	old->old_pos = pos;
	list_add(&old->old_list, &oth->ot_declare_list);
	return false;
}

void osd_tx_declaration_free(struct osd_thandle *oth)
{
	struct osd_obj_declare *old, *tmp;

	list_for_each_entry_safe(old, tmp, &oth->ot_declare_list, old_list) {
		list_del_init(&old->old_list);
		OBD_FREE_PTR(old);
	}
}

/*
 * Concurrency: doesn't access mutable data.
 */
static int osd_param_is_not_sane(const struct osd_device *dev,
				 const struct thandle *th)
{
	struct osd_thandle *oh = container_of(th, typeof(*oh), ot_super);

	return oh->ot_credits > osd_transaction_size(dev);
}

/*
 * Concurrency: shouldn't matter.
 */
static void osd_trans_commit_cb(struct super_block *sb,
				struct ldiskfs_journal_cb_entry *jcb, int error)
{
	struct osd_thandle *oh = container_of(jcb, struct osd_thandle, ot_jcb);
	struct thandle *th = &oh->ot_super;
	struct lu_device *lud = &th->th_dev->dd_lu_dev;
	struct osd_device *osd = osd_dev(lud);
	struct dt_txn_commit_cb *dcb, *tmp;

	LASSERT(oh->ot_handle == NULL);

	if (error)
		CERROR("transaction @0x%p commit error: %d\n", th, error);

	/* call per-transaction callbacks if any */
	list_for_each_entry_safe(dcb, tmp, &oh->ot_commit_dcb_list,
				 dcb_linkage) {
		LASSERTF(dcb->dcb_magic == TRANS_COMMIT_CB_MAGIC,
			 "commit callback entry: magic=%x name='%s'\n",
			 dcb->dcb_magic, dcb->dcb_name);
		list_del_init(&dcb->dcb_linkage);
		dcb->dcb_func(NULL, th, dcb, error);
	}

	lu_ref_del_at(&lud->ld_reference, &oh->ot_dev_link, "osd-tx", th);
	if (atomic_dec_and_test(&osd->od_commit_cb_in_flight))
		wake_up(&osd->od_commit_cb_done);
	th->th_dev = NULL;

	OBD_FREE_PTR(oh);
}

static struct thandle *osd_trans_create(const struct lu_env *env,
					struct dt_device *d)
{
	struct osd_thread_info *oti = osd_oti_get(env);
	struct osd_iobuf *iobuf = &oti->oti_iobuf;
	struct osd_thandle *oh;
	struct thandle *th;

	ENTRY;

	if (d->dd_rdonly) {
		CERROR("%s: someone try to start transaction under "
		       "readonly mode, should be disabled.\n",
		       osd_name(osd_dt_dev(d)));
		dump_stack();
		RETURN(ERR_PTR(-EROFS));
	}

	/* on pending IO in this thread should left from prev. request */
	LASSERT(atomic_read(&iobuf->dr_numreqs) == 0);

	sb_start_write(osd_sb(osd_dt_dev(d)));

	OBD_ALLOC_GFP(oh, sizeof(*oh), GFP_NOFS);
	if (!oh) {
		sb_end_write(osd_sb(osd_dt_dev(d)));
		RETURN(ERR_PTR(-ENOMEM));
	}

	oh->ot_quota_trans = &oti->oti_quota_trans;
	memset(oh->ot_quota_trans, 0, sizeof(*oh->ot_quota_trans));
	th = &oh->ot_super;
	th->th_dev = d;
	th->th_result = 0;
	oh->ot_credits = 0;
	oh->oh_declared_ext = 0;
	INIT_LIST_HEAD(&oh->ot_commit_dcb_list);
	INIT_LIST_HEAD(&oh->ot_stop_dcb_list);
	INIT_LIST_HEAD(&oh->ot_trunc_locks);
	INIT_LIST_HEAD(&oh->ot_declare_list);
	osd_th_alloced(oh);

	memset(oti->oti_declare_ops, 0,
	       sizeof(oti->oti_declare_ops));
	memset(oti->oti_declare_ops_cred, 0,
	       sizeof(oti->oti_declare_ops_cred));
	memset(oti->oti_declare_ops_used, 0,
	       sizeof(oti->oti_declare_ops_used));

	oti->oti_ins_cache_depth++;

	RETURN(th);
}

void osd_trans_dump_creds(const struct lu_env *env, struct thandle *th)
{
	struct osd_thread_info *oti = osd_oti_get(env);
	struct osd_thandle *oh;

	oh = container_of(th, struct osd_thandle, ot_super);
	LASSERT(oh != NULL);

	CWARN("  create: %u/%u/%u, destroy: %u/%u/%u\n",
	      oti->oti_declare_ops[OSD_OT_CREATE],
	      oti->oti_declare_ops_cred[OSD_OT_CREATE],
	      oti->oti_declare_ops_used[OSD_OT_CREATE],
	      oti->oti_declare_ops[OSD_OT_DESTROY],
	      oti->oti_declare_ops_cred[OSD_OT_DESTROY],
	      oti->oti_declare_ops_used[OSD_OT_DESTROY]);
	CWARN("  attr_set: %u/%u/%u, xattr_set: %u/%u/%u\n",
	      oti->oti_declare_ops[OSD_OT_ATTR_SET],
	      oti->oti_declare_ops_cred[OSD_OT_ATTR_SET],
	      oti->oti_declare_ops_used[OSD_OT_ATTR_SET],
	      oti->oti_declare_ops[OSD_OT_XATTR_SET],
	      oti->oti_declare_ops_cred[OSD_OT_XATTR_SET],
	      oti->oti_declare_ops_used[OSD_OT_XATTR_SET]);
	CWARN("  write: %u/%u/%u, punch: %u/%u/%u, quota %u/%u/%u\n",
	      oti->oti_declare_ops[OSD_OT_WRITE],
	      oti->oti_declare_ops_cred[OSD_OT_WRITE],
	      oti->oti_declare_ops_used[OSD_OT_WRITE],
	      oti->oti_declare_ops[OSD_OT_PUNCH],
	      oti->oti_declare_ops_cred[OSD_OT_PUNCH],
	      oti->oti_declare_ops_used[OSD_OT_PUNCH],
	      oti->oti_declare_ops[OSD_OT_QUOTA],
	      oti->oti_declare_ops_cred[OSD_OT_QUOTA],
	      oti->oti_declare_ops_used[OSD_OT_QUOTA]);
	CWARN("  insert: %u/%u/%u, delete: %u/%u/%u\n",
	      oti->oti_declare_ops[OSD_OT_INSERT],
	      oti->oti_declare_ops_cred[OSD_OT_INSERT],
	      oti->oti_declare_ops_used[OSD_OT_INSERT],
	      oti->oti_declare_ops[OSD_OT_DELETE],
	      oti->oti_declare_ops_cred[OSD_OT_DELETE],
	      oti->oti_declare_ops_used[OSD_OT_DELETE]);
	CWARN("  ref_add: %u/%u/%u, ref_del: %u/%u/%u\n",
	      oti->oti_declare_ops[OSD_OT_REF_ADD],
	      oti->oti_declare_ops_cred[OSD_OT_REF_ADD],
	      oti->oti_declare_ops_used[OSD_OT_REF_ADD],
	      oti->oti_declare_ops[OSD_OT_REF_DEL],
	      oti->oti_declare_ops_cred[OSD_OT_REF_DEL],
	      oti->oti_declare_ops_used[OSD_OT_REF_DEL]);
}

/*
 * Concurrency: shouldn't matter.
 */
static int osd_trans_start(const struct lu_env *env, struct dt_device *d,
			   struct thandle *th)
{
	struct osd_thread_info *oti = osd_oti_get(env);
	struct osd_device *dev = osd_dt_dev(d);
	handle_t *jh;
	struct osd_thandle *oh;
	int rc;

	ENTRY;

	LASSERT(current->journal_info == NULL);

	oh = container_of(th, struct osd_thandle, ot_super);
	LASSERT(oh != NULL);
	LASSERT(oh->ot_handle == NULL);
	if (unlikely(ldiskfs_track_declares_assert != 0)) {
		LASSERT(oti->oti_r_locks == 0);
		LASSERT(oti->oti_w_locks == 0);
	}

	rc = dt_txn_hook_start(env, d, th);
	if (rc != 0)
		GOTO(out, rc);

	if (unlikely(osd_param_is_not_sane(dev, th))) {
		static unsigned long last_printed;
		static int last_credits;

		lprocfs_counter_add(dev->od_stats,
				    LPROC_OSD_TOO_MANY_CREDITS, 1);

		/*
		 * don't make noise on a tiny testing systems
		 * actual credits misuse will be caught anyway
		 */
		if (last_credits != oh->ot_credits &&
		    time_after(jiffies, last_printed +
			       cfs_time_seconds(60)) &&
		    osd_transaction_size(dev) > 512) {
			CWARN("%s: credits %u > trans_max %u\n", osd_name(dev),
			      oh->ot_credits, osd_transaction_size(dev));
			osd_trans_dump_creds(env, th);
			libcfs_debug_dumpstack(NULL);
			last_credits = oh->ot_credits;
			last_printed = jiffies;
		}
		/*
		 * XXX Limit the credits to 'max_transaction_buffers', and
		 *     let the underlying filesystem to catch the error if
		 *     we really need so many credits.
		 *
		 *     This should be removed when we can calculate the
		 *     credits precisely.
		 */
		oh->ot_credits = osd_transaction_size(dev);
	} else if (ldiskfs_track_declares_assert != 0) {
		/*
		 * reserve few credits to prevent an assertion in JBD
		 * our debugging mechanism will be able to detected
		 * overuse. this can help to debug single-update
		 * transactions
		 */
		oh->ot_credits += 10;
		if (unlikely(osd_param_is_not_sane(dev, th)))
			oh->ot_credits = osd_transaction_size(dev);
	}

	if (CFS_FAIL_CHECK(OBD_FAIL_OSD_TXN_START))
		GOTO(out, rc = -EIO);

	 /*
	  * we ignore quota checks for system-owned files, but still
	  * need to count blocks for uid/gid/projid
	  */
	osd_trans_declare_op(env, oh, OSD_OT_QUOTA, 3);

	/*
	 * XXX temporary stuff. Some abstraction layer should
	 * be used.
	 */
	jh = osd_journal_start_sb(osd_sb(dev), LDISKFS_HT_MISC, oh->ot_credits);
	osd_th_started(oh);
	if (!IS_ERR(jh)) {
		oh->ot_handle = jh;
		LASSERT(oti->oti_txns == 0);

		atomic_inc(&dev->od_commit_cb_in_flight);
		lu_ref_add_at(&d->dd_lu_dev.ld_reference, &oh->ot_dev_link,
			      "osd-tx", th);
		oti->oti_txns++;
		rc = 0;
	} else {
		rc = PTR_ERR(jh);
	}
out:
	RETURN(rc);
}

static int osd_seq_exists(const struct lu_env *env,
			  struct osd_device *osd, u64 seq)
{
	struct lu_seq_range *range = &osd_oti_get(env)->oti_seq_range;
	struct seq_server_site *ss = osd_seq_site(osd);
	int rc;

	ENTRY;

	LASSERT(ss != NULL);
	LASSERT(ss->ss_server_fld != NULL);

	rc = osd_fld_lookup(env, osd, seq, range);
	if (rc != 0) {
		if (rc != -ENOENT)
			CERROR("%s: can't lookup FLD sequence %#llx: rc = %d\n",
			       osd_name(osd), seq, rc);
		RETURN(0);
	}

	RETURN(ss->ss_node_id == range->lsr_index);
}

static void osd_trans_stop_cb(struct osd_thandle *oth, int result)
{
	struct dt_txn_commit_cb *dcb;
	struct dt_txn_commit_cb *tmp;

	/* call per-transaction stop callbacks if any */
	list_for_each_entry_safe(dcb, tmp, &oth->ot_stop_dcb_list,
				 dcb_linkage) {
		LASSERTF(dcb->dcb_magic == TRANS_COMMIT_CB_MAGIC,
			 "commit callback entry: magic=%x name='%s'\n",
			 dcb->dcb_magic, dcb->dcb_name);
		list_del_init(&dcb->dcb_linkage);
		dcb->dcb_func(NULL, &oth->ot_super, dcb, result);
	}
}

/*
 * Concurrency: shouldn't matter.
 */
static int osd_trans_stop(const struct lu_env *env, struct dt_device *dt,
			  struct thandle *th)
{
	struct osd_thread_info *oti = osd_oti_get(env);
	struct osd_thandle *oh;
	struct osd_iobuf *iobuf = &oti->oti_iobuf;
	struct osd_device *osd = osd_dt_dev(th->th_dev);
	struct qsd_instance *qsd = osd_def_qsd(osd);
	struct lquota_trans *qtrans;
	LIST_HEAD(truncates);
	int rc = 0, remove_agents = 0;

	ENTRY;

	oh = container_of(th, struct osd_thandle, ot_super);

	remove_agents = oh->ot_remove_agents;

	qtrans = oh->ot_quota_trans;
	oh->ot_quota_trans = NULL;

	osd_tx_declaration_free(oh);

	/* move locks to local list, stop tx, execute truncates */
	list_splice(&oh->ot_trunc_locks, &truncates);

	if (oh->ot_handle != NULL) {
		int rc2;

		handle_t *hdl = oh->ot_handle;

		/*
		 * add commit callback
		 * notice we don't do this in osd_trans_start()
		 * as underlying transaction can change during truncate
		 */
		ldiskfs_journal_callback_add(hdl, osd_trans_commit_cb,
					     &oh->ot_jcb);

		LASSERT(oti->oti_txns == 1);
		oti->oti_txns--;

		rc = dt_txn_hook_stop(env, th);
		if (rc != 0)
			CERROR("%s: failed in transaction hook: rc = %d\n",
			       osd_name(osd), rc);

		osd_trans_stop_cb(oh, rc);
		/* hook functions might modify th_sync */
		hdl->h_sync = th->th_sync;

		oh->ot_handle = NULL;
		OSD_CHECK_SLOW_TH(oh, osd, rc2 = ldiskfs_journal_stop(hdl));
		if (rc2 != 0)
			CERROR("%s: failed to stop transaction: rc = %d\n",
			       osd_name(osd), rc2);
		if (!rc)
			rc = rc2;

		/* We preserve the origin behavior of ignoring any
		 * failures with the underlying punch / truncate
		 * operation. We do record for debugging if an error
		 * does occur in the lctl dk logs.
		 */
		rc2 = osd_process_truncates(env, &truncates);
		if (rc2 != 0)
			CERROR("%s: failed truncate process: rc = %d\n",
			       osd_name(osd), rc2);
	} else {
		osd_trans_stop_cb(oh, th->th_result);
		OBD_FREE_PTR(oh);
	}

	osd_trunc_unlock_all(env, &truncates);

	/* inform the quota slave device that the transaction is stopping */
	qsd_op_end(env, qsd, qtrans);

	/*
	 * as we want IO to journal and data IO be concurrent, we don't block
	 * awaiting data IO completion in osd_do_bio(), instead we wait here
	 * once transaction is submitted to the journal. all reqular requests
	 * don't do direct IO (except read/write), thus this wait_event becomes
	 * no-op for them.
	 *
	 * IMPORTANT: we have to wait till any IO submited by the thread is
	 * completed otherwise iobuf may be corrupted by different request
	 */
	wait_event(iobuf->dr_wait,
		       atomic_read(&iobuf->dr_numreqs) == 0);
	osd_fini_iobuf(osd, iobuf);
	if (!rc)
		rc = iobuf->dr_error;

	if (unlikely(remove_agents != 0))
		osd_process_scheduled_agent_removals(env, osd);

	LASSERT(oti->oti_ins_cache_depth > 0);
	oti->oti_ins_cache_depth--;
	/* reset OI cache for safety */
	if (oti->oti_ins_cache_depth == 0)
		oti->oti_ins_cache_used = 0;

	sb_end_write(osd_sb(osd));

	RETURN(rc);
}

static int osd_trans_cb_add(struct thandle *th, struct dt_txn_commit_cb *dcb)
{
	struct osd_thandle *oh = container_of(th, struct osd_thandle,
					      ot_super);

	LASSERT(dcb->dcb_magic == TRANS_COMMIT_CB_MAGIC);
	LASSERT(&dcb->dcb_func != NULL);
	if (dcb->dcb_flags & DCB_TRANS_STOP)
		list_add(&dcb->dcb_linkage, &oh->ot_stop_dcb_list);
	else
		list_add(&dcb->dcb_linkage, &oh->ot_commit_dcb_list);

	return 0;
}

/*
 * Called just before object is freed. Releases all resources except for
 * object itself (that is released by osd_object_free()).
 *
 * Concurrency: no concurrent access is possible that late in object
 * life-cycle.
 */
static void osd_object_delete(const struct lu_env *env, struct lu_object *l)
{
	struct osd_object *obj = osd_obj(l);
	struct qsd_instance *qsd = osd_def_qsd(osd_obj2dev(obj));
	struct inode *inode = obj->oo_inode;
	__u64 projid;
	qid_t uid;
	qid_t gid;

	LINVRNT(osd_invariant(obj));

	/*
	 * If object is unlinked remove fid->ino mapping from object index.
	 */

	osd_index_fini(obj);

	if (!inode)
		return;

	if (osd_has_index(obj) &&  obj->oo_dt.do_index_ops == &osd_index_iam_ops)
		ldiskfs_set_inode_flag(inode, LDISKFS_INODE_JOURNAL_DATA);

	uid = i_uid_read(inode);
	gid = i_gid_read(inode);
	projid = i_projid_read(inode);

	obj->oo_inode = NULL;
	iput(inode);

	/* do not rebalance quota if the caller needs to release memory
	 * otherwise qsd_refresh_usage() may went into a new ldiskfs
	 * transaction and risk to deadlock - LU-12178 */
	if (current->flags & (PF_MEMALLOC | PF_KSWAPD))
		return;

	if (!obj->oo_header && qsd) {
		struct osd_thread_info *info = osd_oti_get(env);
		struct lquota_id_info *qi = &info->oti_qi;

		/* Release granted quota to master if necessary */
		qi->lqi_id.qid_uid = uid;
		qsd_op_adjust(env, qsd, &qi->lqi_id, USRQUOTA);

		qi->lqi_id.qid_uid = gid;
		qsd_op_adjust(env, qsd, &qi->lqi_id, GRPQUOTA);

		qi->lqi_id.qid_uid = projid;
		qsd_op_adjust(env, qsd, &qi->lqi_id, PRJQUOTA);
	}
}

/*
 * Concurrency: ->loo_object_release() is called under site spin-lock.
 */
static void osd_object_release(const struct lu_env *env,
			       struct lu_object *l)
{
	struct osd_object *o = osd_obj(l);

	/*
	 * nobody should be releasing a non-destroyed object with nlink=0
	 * the API allows this, but ldiskfs doesn't like and then report
	 * this inode as deleted
	 */
	LASSERT(!(o->oo_destroyed == 0 && o->oo_inode &&
		  o->oo_inode->i_nlink == 0));
}

/*
 * Concurrency: shouldn't matter.
 */
static int osd_object_print(const struct lu_env *env, void *cookie,
			    lu_printer_t p, const struct lu_object *l)
{
	struct osd_object *o = osd_obj(l);
	struct iam_descr *d;

	if (o->oo_dir != NULL)
		d = o->oo_dir->od_container.ic_descr;
	else
		d = NULL;
	return (*p)(env, cookie,
		    LUSTRE_OSD_LDISKFS_NAME"-object@%p(i:%p:%lu/%u)[%s]",
		    o, o->oo_inode,
		    o->oo_inode ? o->oo_inode->i_ino : 0UL,
		    o->oo_inode ? o->oo_inode->i_generation : 0,
		    d ? d->id_ops->id_name : "plain");
}

/*
 * Concurrency: shouldn't matter.
 */
int osd_statfs(const struct lu_env *env, struct dt_device *d,
		struct obd_statfs *sfs, struct obd_statfs_info *info)
{
	struct osd_device *osd = osd_dt_dev(d);
	struct super_block *sb = osd_sb(osd);
	struct kstatfs *ksfs;
	__u64 reserved;
	int result = 0;

	if (unlikely(osd->od_mnt == NULL))
		return -EINPROGRESS;

	/* osd_lproc.c call this without env, allocate ksfs for that case */
	if (unlikely(env == NULL)) {
		OBD_ALLOC_PTR(ksfs);
		if (ksfs == NULL)
			return -ENOMEM;
	} else {
		ksfs = &osd_oti_get(env)->oti_ksfs;
	}

	result = sb->s_op->statfs(sb->s_root, ksfs);
	if (result)
		goto out;

	statfs_pack(sfs, ksfs);
	if (unlikely(sb->s_flags & SB_RDONLY))
		sfs->os_state |= OS_STATFS_READONLY;

	sfs->os_state |= osd->od_nonrotational ? OS_STATFS_NONROT : 0;

	if (ldiskfs_has_feature_extents(sb))
		sfs->os_maxbytes = sb->s_maxbytes;
	else
		sfs->os_maxbytes = LDISKFS_SB(sb)->s_bitmap_maxbytes;

	/*
	 * Reserve some space so to avoid fragmenting the filesystem too much.
	 * Fragmentation not only impacts performance, but can also increase
	 * metadata overhead significantly, causing grant calculation to be
	 * wrong.
	 *
	 * Reserve 0.78% of total space, at least 8MB for small filesystems.
	 */
	BUILD_BUG_ON(OSD_STATFS_RESERVED <= LDISKFS_MAX_BLOCK_SIZE);
	reserved = OSD_STATFS_RESERVED >> sb->s_blocksize_bits;
	if (likely(sfs->os_blocks >= reserved << OSD_STATFS_RESERVED_SHIFT))
		reserved = sfs->os_blocks >> OSD_STATFS_RESERVED_SHIFT;

	sfs->os_blocks -= reserved;
	sfs->os_bfree  -= min(reserved, sfs->os_bfree);
	sfs->os_bavail -= min(reserved, sfs->os_bavail);

out:
	if (unlikely(env == NULL))
		OBD_FREE_PTR(ksfs);
	return result;
}

/**
 * Estimate space needed for file creations. We assume the largest filename
 * which is 2^64 - 1, hence a filename of 20 chars.
 * This is 28 bytes per object which is 28MB for 1M objects ... no so bad.
 */
#ifdef __LDISKFS_DIR_REC_LEN
# define PER_OBJ_USAGE __LDISKFS_DIR_REC_LEN(20)
#elif defined  LDISKFS_DIR_REC_LEN_WITH_DIR
# define PER_OBJ_USAGE LDISKFS_DIR_REC_LEN(20, NULL)
#else
# define PER_OBJ_USAGE LDISKFS_DIR_REC_LEN(20)
#endif

/*
 * Concurrency: doesn't access mutable data.
 */
static void osd_conf_get(const struct lu_env *env,
			 const struct dt_device *dev,
			 struct dt_device_param *param)
{
	struct osd_device *d = osd_dt_dev(dev);
	struct super_block *sb = osd_sb(d);
	struct blk_integrity *bi = bdev_get_integrity(sb->s_bdev);
	const char *name;
	int ea_overhead;

	/*
	 * XXX should be taken from not-yet-existing fs abstraction layer.
	 */
	param->ddp_max_name_len = LDISKFS_NAME_LEN;
	param->ddp_max_nlink    = LDISKFS_LINK_MAX;
	param->ddp_symlink_max  = sb->s_blocksize;
	param->ddp_mount_type   = LDD_MT_LDISKFS;
	if (ldiskfs_has_feature_extents(sb))
		param->ddp_maxbytes = sb->s_maxbytes;
	else
		param->ddp_maxbytes = LDISKFS_SB(sb)->s_bitmap_maxbytes;
	/*
	 * inode are statically allocated, so per-inode space consumption
	 * is the space consumed by the directory entry
	 */
	param->ddp_inodespace     = PER_OBJ_USAGE;
	/*
	 * EXT_INIT_MAX_LEN is the theoretical maximum extent size (32k blocks
	 * is 128MB) which is unlikely to be hit in real life. Report a smaller
	 * maximum length to not under-count the actual number of extents
	 * needed for writing a file if there are sub-optimal block allocations.
	 */
	param->ddp_max_extent_blks = EXT_INIT_MAX_LEN >> 1;
	/* worst-case extent insertion metadata overhead */
	param->ddp_extent_tax = 6 * LDISKFS_BLOCK_SIZE(sb);
	param->ddp_mntopts = 0;
	if (test_opt(sb, XATTR_USER))
		param->ddp_mntopts |= MNTOPT_USERXATTR;
	if (test_opt(sb, POSIX_ACL))
		param->ddp_mntopts |= MNTOPT_ACL;

	/*
	 * LOD might calculate the max stripe count based on max_ea_size,
	 * so we need take account in the overhead as well,
	 * xattr_header + magic + xattr_entry_head
	 */
	ea_overhead = sizeof(struct ldiskfs_xattr_header) + sizeof(__u32) +
		      LDISKFS_XATTR_LEN(XATTR_NAME_MAX_LEN);

#if defined(LDISKFS_FEATURE_INCOMPAT_EA_INODE)
	if (ldiskfs_has_feature_ea_inode(sb))
		param->ddp_max_ea_size = LDISKFS_XATTR_MAX_LARGE_EA_SIZE -
								ea_overhead;
	else
#endif
		param->ddp_max_ea_size = sb->s_blocksize - ea_overhead;

	if (param->ddp_max_ea_size > OBD_MAX_EA_SIZE)
		param->ddp_max_ea_size = OBD_MAX_EA_SIZE;

	/*
	 * Preferred RPC size for efficient disk IO.  4MB shows good
	 * all-around performance for ldiskfs, but use bigalloc chunk size
	 * by default if larger.
	 */
#if defined(LDISKFS_CLUSTER_SIZE)
	if (LDISKFS_CLUSTER_SIZE(sb) > DT_DEF_BRW_SIZE)
		param->ddp_brw_size = LDISKFS_CLUSTER_SIZE(sb);
	else
#endif
		param->ddp_brw_size = DT_DEF_BRW_SIZE;

	param->ddp_t10_cksum_type = 0;
	if (bi) {
		unsigned short interval = blk_integrity_interval(bi);
		name = blk_integrity_name(bi);
		/*
		 * Expected values:
		 * T10-DIF-TYPE1-CRC
		 * T10-DIF-TYPE2-CRC
		 * T10-DIF-TYPE3-CRC
		 * T10-DIF-TYPE1-IP
		 * T10-DIF-TYPE2-IP
		 * T10-DIF-TYPE3-IP
		 */
		if (strncmp(name, "T10-DIF-TYPE",
			    sizeof("T10-DIF-TYPE") - 1) == 0) {
			/* also skip "1/2/3-" at end */
			const int type_off = sizeof("T10-DIF-TYPE.");
			char type_number = name[type_off - 2];

			if (interval != 512 && interval != 4096) {
				CERROR("%s: unsupported T10PI sector size %u\n",
				       d->od_svname, interval);
				goto out;
			}
			switch (type_number) {
			case '1':
				d->od_t10_type = OSD_T10_TYPE1;
				break;
			case '2':
				d->od_t10_type = OSD_T10_TYPE2;
				break;
			case '3':
				d->od_t10_type = OSD_T10_TYPE3;
				break;
			default:
				CERROR("%s: unsupported T10PI type %s\n",
				       d->od_svname, name);
				goto out;
			}
			if (strcmp(name + type_off, "CRC") == 0) {
				d->od_t10_type |= OSD_T10_TYPE_CRC;
				param->ddp_t10_cksum_type = interval == 512 ?
					OBD_CKSUM_T10CRC512 :
					OBD_CKSUM_T10CRC4K;
			} else if (strcmp(name + type_off, "IP") == 0) {
				d->od_t10_type |= OSD_T10_TYPE_IP;
				param->ddp_t10_cksum_type = interval == 512 ?
					OBD_CKSUM_T10IP512 :
					OBD_CKSUM_T10IP4K;
			} else {
				CERROR("%s: unsupported checksum type of T10PI type '%s'\n",
				       d->od_svname, name);
				d->od_t10_type = 0;
			}

		} else {
			CERROR("%s: unsupported T10PI type '%s'\n",
			       d->od_svname, name);
		}
	}

out:
	param->ddp_has_lseek_data_hole = true;
}

static struct vfsmount *osd_mnt_get(const struct dt_device *d)
{
	return osd_dt_dev(d)->od_mnt;
}

/*
 * Concurrency: shouldn't matter.
 */
static int osd_sync(const struct lu_env *env, struct dt_device *d)
{
	int rc;
	struct super_block *s = osd_sb(osd_dt_dev(d));
	ENTRY;

	down_read(&s->s_umount);
	rc = s->s_op->sync_fs(s, 1);
	up_read(&s->s_umount);

	CDEBUG(D_CACHE, "%s: synced OSD: rc = %d\n", osd_dt_dev(d)->od_svname,
	       rc);

	return rc;
}

/**
 * Start commit for OSD device.
 *
 * An implementation of dt_commit_async method for OSD device.
 * Asychronously starts underlayng fs sync and thereby a transaction
 * commit.
 *
 * \param env environment
 * \param d dt device
 *
 * \see dt_device_operations
 */
static int osd_commit_async(const struct lu_env *env,
			    struct dt_device *d)
{
	struct super_block *s = osd_sb(osd_dt_dev(d));
	int rc;

	ENTRY;

	CDEBUG(D_HA, "%s: async commit OSD\n", osd_dt_dev(d)->od_svname);
	down_read(&s->s_umount);
	rc = s->s_op->sync_fs(s, 0);
	up_read(&s->s_umount);

	RETURN(rc);
}

/*
 * Concurrency: shouldn't matter.
 */
static int osd_ro(const struct lu_env *env, struct dt_device *d)
{
	struct super_block *sb = osd_sb(osd_dt_dev(d));
	struct block_device *dev = sb->s_bdev;
	int rc = -EOPNOTSUPP;

	ENTRY;

	CERROR("%s: %lx CANNOT BE SET READONLY: rc = %d\n",
	       osd_dt_dev(d)->od_svname, (long)dev, rc);

	RETURN(rc);
}

/**
 * Note: we do not count into QUOTA here.
 * If we mount with --data_journal we may need more.
 */
const int osd_dto_credits_noquota[DTO_NR] = {
	/**
	 * Insert.
	 * INDEX_EXTRA_TRANS_BLOCKS(8) +
	 * SINGLEDATA_TRANS_BLOCKS(8)
	 * XXX Note: maybe iam need more, since iam have more level than
	 *           EXT3 htree.
	 */
	[DTO_INDEX_INSERT]  = 16,
	/**
	 * Delete
	 * just modify a single entry, probably merge few within a block
	 */
	[DTO_INDEX_DELETE]  = 1,
	/**
	 * Used for OI scrub
	 */
	[DTO_INDEX_UPDATE]  = 16,
	/**
	 * 4(inode, inode bits, groups, GDT)
	 *   notice: OI updates are counted separately with DTO_INDEX_INSERT
	 */
	[DTO_OBJECT_CREATE] = 4,
	/**
	 * 4(inode, inode bits, groups, GDT)
	 *   notice: OI updates are counted separately with DTO_INDEX_DELETE
	 */
	[DTO_OBJECT_DELETE] = 4,
	/**
	 * Attr set credits (inode)
	 */
	[DTO_ATTR_SET_BASE] = 1,
	/**
	 * Xattr set. The same as xattr of EXT3.
	 * DATA_TRANS_BLOCKS(14)
	 * XXX Note: in original MDS implmentation INDEX_EXTRA_TRANS_BLOCKS
	 * are also counted in. Do not know why?
	 */
	[DTO_XATTR_SET]     = 14,
	/**
	 * credits for inode change during write.
	 */
	[DTO_WRITE_BASE]    = 3,
	/**
	 * credits for single block write.
	 */
	[DTO_WRITE_BLOCK]   = 14,
	/**
	 * Attr set credits for chown.
	 * This is extra credits for setattr, and it is null without quota
	 */
	[DTO_ATTR_SET_CHOWN] = 0
};

/* reserve or free quota for some operation */
static int osd_reserve_or_free_quota(const struct lu_env *env,
				     struct dt_device *dev,
				     struct lquota_id_info *qi)
{
	struct osd_device	*osd = osd_dt_dev(dev);
	struct qsd_instance	*qsd = NULL;
	int rc;

	ENTRY;

	if (qi->lqi_is_blk)
		qsd = osd->od_quota_slave_dt;
	else
		qsd = osd->od_quota_slave_md;

	rc = qsd_reserve_or_free_quota(env, qsd, qi);
	RETURN(rc);
}

static const struct dt_device_operations osd_dt_ops = {
	.dt_root_get		  = osd_root_get,
	.dt_statfs		  = osd_statfs,
	.dt_trans_create	  = osd_trans_create,
	.dt_trans_start		  = osd_trans_start,
	.dt_trans_stop		  = osd_trans_stop,
	.dt_trans_cb_add	  = osd_trans_cb_add,
	.dt_conf_get		  = osd_conf_get,
	.dt_mnt_get		  = osd_mnt_get,
	.dt_sync		  = osd_sync,
	.dt_ro			  = osd_ro,
	.dt_commit_async	  = osd_commit_async,
	.dt_reserve_or_free_quota = osd_reserve_or_free_quota,
};

static void osd_read_lock(const struct lu_env *env, struct dt_object *dt,
			  unsigned int role)
{
	struct osd_object *obj = osd_dt_obj(dt);
	struct osd_thread_info *oti = osd_oti_get(env);

	LINVRNT(osd_invariant(obj));

	LASSERT(obj->oo_owner != env);
	down_read_nested(&obj->oo_sem, role);

	LASSERT(obj->oo_owner == NULL);
	oti->oti_r_locks++;
}

static void osd_write_lock(const struct lu_env *env, struct dt_object *dt,
			   unsigned int role)
{
	struct osd_object *obj = osd_dt_obj(dt);
	struct osd_thread_info *oti = osd_oti_get(env);

	LINVRNT(osd_invariant(obj));

	LASSERT(obj->oo_owner != env);
	down_write_nested(&obj->oo_sem, role);

	LASSERT(obj->oo_owner == NULL);
	obj->oo_owner = env;
	oti->oti_w_locks++;
}

static void osd_read_unlock(const struct lu_env *env, struct dt_object *dt)
{
	struct osd_object *obj = osd_dt_obj(dt);
	struct osd_thread_info *oti = osd_oti_get(env);

	LINVRNT(osd_invariant(obj));

	LASSERT(oti->oti_r_locks > 0);
	oti->oti_r_locks--;
	up_read(&obj->oo_sem);
}

static void osd_write_unlock(const struct lu_env *env, struct dt_object *dt)
{
	struct osd_object *obj = osd_dt_obj(dt);
	struct osd_thread_info *oti = osd_oti_get(env);

	LINVRNT(osd_invariant(obj));

	LASSERT(obj->oo_owner == env);
	LASSERT(oti->oti_w_locks > 0);
	oti->oti_w_locks--;
	obj->oo_owner = NULL;
	up_write(&obj->oo_sem);
}

static int osd_write_locked(const struct lu_env *env, struct dt_object *dt)
{
	struct osd_object *obj = osd_dt_obj(dt);

	LINVRNT(osd_invariant(obj));

	return obj->oo_owner == env;
}

static void osd_inode_getattr(const struct lu_env *env,
			      struct inode *inode, struct lu_attr *attr)
{
	attr->la_valid	|= LA_ATIME | LA_MTIME | LA_CTIME | LA_MODE |
			   LA_SIZE | LA_BLOCKS | LA_UID | LA_GID |
			   LA_PROJID | LA_FLAGS | LA_NLINK | LA_RDEV |
			   LA_BLKSIZE | LA_TYPE | LA_BTIME;

	attr->la_atime = inode->i_atime.tv_sec;
	attr->la_mtime = inode->i_mtime.tv_sec;
	attr->la_ctime = inode->i_ctime.tv_sec;
	attr->la_btime = LDISKFS_I(inode)->i_crtime.tv_sec;
	attr->la_mode	 = inode->i_mode;
	attr->la_size	 = i_size_read(inode);
	attr->la_blocks	 = inode->i_blocks;
	attr->la_uid	 = i_uid_read(inode);
	attr->la_gid	 = i_gid_read(inode);
	attr->la_projid	 = i_projid_read(inode);
	attr->la_flags	 = ll_inode_to_ext_flags(inode->i_flags);
	attr->la_nlink	 = inode->i_nlink;
	attr->la_rdev	 = inode->i_rdev;
	attr->la_blksize = 1 << inode->i_blkbits;
	attr->la_blkbits = inode->i_blkbits;
	/*
	 * Ext4 did not transfer inherit flags from raw inode
	 * to inode flags, and ext4 internally test raw inode
	 * @i_flags directly. Instead of patching ext4, we do it here.
	 */
	if (LDISKFS_I(inode)->i_flags & LUSTRE_PROJINHERIT_FL)
		attr->la_flags |= LUSTRE_PROJINHERIT_FL;
}

static int osd_dirent_count(const struct lu_env *env, struct dt_object *dt,
			    u64 *count)
{
	struct osd_object *obj = osd_dt_obj(dt);
	const struct dt_it_ops *iops;
	struct dt_it *it;
	int rc;

	ENTRY;

	LASSERT(S_ISDIR(obj->oo_inode->i_mode));
	LASSERT(fid_is_namespace_visible(lu_object_fid(&obj->oo_dt.do_lu)));

	if (obj->oo_dirent_count != LU_DIRENT_COUNT_UNSET) {
		*count = obj->oo_dirent_count;
		RETURN(0);
	}

	/* directory not initialized yet */
	if (!dt->do_index_ops) {
		*count = 0;
		RETURN(0);
	}

	iops = &dt->do_index_ops->dio_it;
	it = iops->init(env, dt, LUDA_64BITHASH);
	if (IS_ERR(it))
		RETURN(PTR_ERR(it));

	rc = iops->load(env, it, 0);
	if (rc < 0) {
		if (rc == -ENODATA) {
			rc = 0;
			*count = 0;
		}
		GOTO(out, rc);
	}
	if (rc > 0)
		rc = iops->next(env, it);

	for (*count = 0; rc == 0 || rc == -ESTALE; rc = iops->next(env, it)) {
		if (rc == -ESTALE)
			continue;

		if (iops->key_size(env, it) == 0)
			continue;

		(*count)++;
	}
	if (rc == 1) {
		obj->oo_dirent_count = *count;
		rc = 0;
	}
out:
	iops->put(env, it);
	iops->fini(env, it);

	RETURN(rc);
}

static int osd_attr_get(const struct lu_env *env, struct dt_object *dt,
			struct lu_attr *attr)
{
	struct osd_object *obj = osd_dt_obj(dt);
	int rc = 0;

	if (unlikely(!dt_object_exists(dt)))
		return -ENOENT;
	if (unlikely(obj->oo_destroyed))
		return -ENOENT;

	LASSERT(!dt_object_remote(dt));
	LINVRNT(osd_invariant(obj));

	spin_lock(&obj->oo_guard);
	osd_inode_getattr(env, obj->oo_inode, attr);
	if (obj->oo_lma_flags & LUSTRE_ORPHAN_FL) {
		attr->la_valid |= LA_FLAGS;
		attr->la_flags |= LUSTRE_ORPHAN_FL;
	}
	if (obj->oo_lma_flags & LUSTRE_ENCRYPT_FL) {
		attr->la_valid |= LA_FLAGS;
		attr->la_flags |= LUSTRE_ENCRYPT_FL;
	}
	spin_unlock(&obj->oo_guard);

	if (S_ISDIR(obj->oo_inode->i_mode) &&
	    fid_is_namespace_visible(lu_object_fid(&dt->do_lu)))
		rc = osd_dirent_count(env, dt, &attr->la_dirent_count);

	return rc;
}

static int osd_declare_attr_qid(const struct lu_env *env,
				struct osd_object *obj,
				struct osd_thandle *oh, long long bspace,
				qid_t old_id, qid_t new_id, bool enforce,
				unsigned int type)
{
	int rc;
	struct osd_thread_info *info = osd_oti_get(env);
	struct lquota_id_info  *qi = &info->oti_qi;

	qi->lqi_type = type;
	/* inode accounting */
	qi->lqi_is_blk = false;

	/* one more inode for the new id ... */
	qi->lqi_id.qid_uid = new_id;
	qi->lqi_space      = 1;
	/* Reserve credits for the new id */
	rc = osd_declare_qid(env, oh, qi, NULL, enforce, NULL);
	if (rc == -EDQUOT || rc == -EINPROGRESS)
		rc = 0;
	if (rc)
		RETURN(rc);

	/* and one less inode for the current id */
	qi->lqi_id.qid_uid = old_id;
	qi->lqi_space = -1;
	rc = osd_declare_qid(env, oh, qi, obj, enforce, NULL);
	if (rc == -EDQUOT || rc == -EINPROGRESS)
		rc = 0;
	if (rc)
		RETURN(rc);

	/* block accounting */
	qi->lqi_is_blk = true;

	/* more blocks for the new id ... */
	qi->lqi_id.qid_uid = new_id;
	qi->lqi_space      = bspace;
	/*
	 * Credits for the new uid has been reserved, re-use "obj"
	 * to save credit reservation.
	 */
	rc = osd_declare_qid(env, oh, qi, obj, enforce, NULL);
	if (rc == -EDQUOT || rc == -EINPROGRESS)
		rc = 0;
	if (rc)
		RETURN(rc);

	/* and finally less blocks for the current uid */
	qi->lqi_id.qid_uid = old_id;
	qi->lqi_space      = -bspace;
	rc = osd_declare_qid(env, oh, qi, obj, enforce, NULL);
	if (rc == -EDQUOT || rc == -EINPROGRESS)
		rc = 0;

	RETURN(rc);
}

static int osd_declare_attr_set(const struct lu_env *env,
				struct dt_object *dt,
				const struct lu_attr *attr,
				struct thandle *handle)
{
	struct osd_thandle *oh;
	struct osd_object *obj;
	qid_t uid;
	qid_t gid;
	long long bspace;
	int rc = 0;
	bool enforce;

	ENTRY;

	LASSERT(dt != NULL);
	LASSERT(handle != NULL);

	obj = osd_dt_obj(dt);
	LASSERT(osd_invariant(obj));

	oh = container_of(handle, struct osd_thandle, ot_super);
	LASSERT(oh->ot_handle == NULL);

	osd_trans_declare_op(env, oh, OSD_OT_ATTR_SET,
			     osd_dto_credits_noquota[DTO_ATTR_SET_BASE]);

	osd_trans_declare_op(env, oh, OSD_OT_XATTR_SET,
			     osd_dto_credits_noquota[DTO_XATTR_SET]);

	if (attr == NULL || obj->oo_inode == NULL)
		RETURN(rc);

	bspace   = obj->oo_inode->i_blocks << 9;
	bspace   = toqb(bspace);

	/*
	 * Changing ownership is always preformed by super user, it should not
	 * fail with EDQUOT unless required explicitly.
	 *
	 * We still need to call the osd_declare_qid() to calculate the journal
	 * credits for updating quota accounting files and to trigger quota
	 * space adjustment once the operation is completed.
	 */
	if (attr->la_valid & LA_UID || attr->la_valid & LA_GID) {
		/* USERQUOTA */
		uid = i_uid_read(obj->oo_inode);
		enforce = (attr->la_valid & LA_UID) && (attr->la_uid != uid);
		rc = osd_declare_attr_qid(env, obj, oh, bspace, uid,
					  attr->la_uid, enforce, USRQUOTA);
		if (rc)
			RETURN(rc);

		gid = i_gid_read(obj->oo_inode);
		CDEBUG(D_QUOTA, "declare uid %d -> %d gid %d -> %d\n", uid,
		       attr->la_uid, gid, attr->la_gid);
		enforce = (attr->la_valid & LA_GID) && (attr->la_gid != gid);
		rc = osd_declare_attr_qid(env, obj, oh, bspace, gid,
					  attr->la_gid, enforce, GRPQUOTA);
		if (rc)
			RETURN(rc);

	}
#ifdef HAVE_PROJECT_QUOTA
	if (attr->la_valid & LA_PROJID) {
		__u32 projid = i_projid_read(obj->oo_inode);

		enforce = (attr->la_valid & LA_PROJID) &&
					(attr->la_projid != projid);
		rc = osd_declare_attr_qid(env, obj, oh, bspace,
					  (qid_t)projid, (qid_t)attr->la_projid,
					  enforce, PRJQUOTA);
		if (rc)
			RETURN(rc);
	}
#endif
	/* punch must be aware we are dealing with an encrypted file */
	if (attr->la_valid & LA_FLAGS && attr->la_flags & LUSTRE_ENCRYPT_FL)
		obj->oo_lma_flags |= LUSTRE_ENCRYPT_FL;

	RETURN(rc);
}

static int osd_inode_setattr(const struct lu_env *env,
			     struct inode *inode, const struct lu_attr *attr)
{
	__u64 bits = attr->la_valid;

	/* Only allow set size for regular file */
	if (!S_ISREG(inode->i_mode))
		bits &= ~(LA_SIZE | LA_BLOCKS);

	if (bits == 0)
		return 0;

	if (bits & LA_ATIME)
		inode->i_atime = osd_inode_time(inode, attr->la_atime);
	if (bits & LA_CTIME)
		inode->i_ctime = osd_inode_time(inode, attr->la_ctime);
	if (bits & LA_MTIME)
		inode->i_mtime = osd_inode_time(inode, attr->la_mtime);
	if (bits & LA_SIZE) {
		spin_lock(&inode->i_lock);
		LDISKFS_I(inode)->i_disksize = attr->la_size;
		i_size_write(inode, attr->la_size);
		spin_unlock(&inode->i_lock);
	}

	/*
	 * OSD should not change "i_blocks" which is used by quota.
	 * "i_blocks" should be changed by ldiskfs only.
	 */
	if (bits & LA_MODE)
		inode->i_mode = (inode->i_mode & S_IFMT) |
				(attr->la_mode & ~S_IFMT);
	if (bits & LA_UID)
		i_uid_write(inode, attr->la_uid);
	if (bits & LA_GID)
		i_gid_write(inode, attr->la_gid);
	if (bits & LA_PROJID)
		i_projid_write(inode, attr->la_projid);
	if (bits & LA_NLINK)
		set_nlink(inode, attr->la_nlink);
	if (bits & LA_RDEV)
		inode->i_rdev = attr->la_rdev;

	if (bits & LA_FLAGS) {
		/* always keep S_NOCMTIME */
		inode->i_flags = ll_ext_to_inode_flags(attr->la_flags) |
				 S_NOCMTIME;
#if defined(S_ENCRYPTED)
		/* Always remove S_ENCRYPTED, because ldiskfs must not be
		 * aware of encryption status. It is just stored into LMA
		 * so that it can be forwared to client side.
		 */
		inode->i_flags &= ~S_ENCRYPTED;
#endif
		/*
		 * Ext4 did not transfer inherit flags from
		 * @inode->i_flags to raw inode i_flags when writing
		 * flags, we do it explictly here.
		 */
		if (attr->la_flags & LUSTRE_PROJINHERIT_FL)
			LDISKFS_I(inode)->i_flags |= LUSTRE_PROJINHERIT_FL;
		else
			LDISKFS_I(inode)->i_flags &= ~LUSTRE_PROJINHERIT_FL;
	}
	return 0;
}

#ifdef HAVE_PROJECT_QUOTA
static int osd_transfer_project(struct inode *inode, __u32 projid,
				struct thandle *handle)
{
	struct super_block *sb = inode->i_sb;
	struct ldiskfs_inode_info *ei = LDISKFS_I(inode);
	int err;
	kprojid_t kprojid;
	struct ldiskfs_iloc iloc;
	struct ldiskfs_inode *raw_inode;
	struct dquot *transfer_to[LDISKFS_MAXQUOTAS] = { };

	if (!ldiskfs_has_feature_project(sb)) {
		LASSERT(__kprojid_val(LDISKFS_I(inode)->i_projid)
			== LDISKFS_DEF_PROJID);
		if (projid != LDISKFS_DEF_PROJID)
			return -EOPNOTSUPP;
		else
			return 0;
	}

	if (LDISKFS_INODE_SIZE(sb) <= LDISKFS_GOOD_OLD_INODE_SIZE)
		return -EOPNOTSUPP;

	kprojid = make_kprojid(&init_user_ns, (projid_t)projid);
	if (projid_eq(kprojid, LDISKFS_I(inode)->i_projid))
		return 0;

	err = ldiskfs_get_inode_loc(inode, &iloc);
	if (err)
		return err;

	raw_inode = ldiskfs_raw_inode(&iloc);
	if (!LDISKFS_FITS_IN_INODE(raw_inode, ei, i_projid)) {
		struct osd_thandle *oh = container_of(handle,
						      struct osd_thandle,
						      ot_super);
		/**
		 * try to expand inode size automatically.
		 */
		ldiskfs_mark_inode_dirty(oh->ot_handle, inode);
		if (!LDISKFS_FITS_IN_INODE(raw_inode, ei, i_projid)) {
			err = -EOVERFLOW;
			brelse(iloc.bh);
			return err;
		}
	}
	brelse(iloc.bh);

	dquot_initialize(inode);
	transfer_to[PRJQUOTA] = dqget(sb, make_kqid_projid(kprojid));
	if (transfer_to[PRJQUOTA]) {
		lock_dquot_transfer(inode);
		err = __dquot_transfer(inode, transfer_to);
		unlock_dquot_transfer(inode);
		dqput(transfer_to[PRJQUOTA]);
		if (err)
			return err;
	}

	return err;
}
#endif

static int osd_quota_transfer(struct inode *inode, const struct lu_attr *attr,
			      struct thandle *handle)
{
	int rc;

	if ((attr->la_valid & LA_UID && attr->la_uid != i_uid_read(inode)) ||
	    (attr->la_valid & LA_GID && attr->la_gid != i_gid_read(inode))) {
		struct iattr iattr;

		CDEBUG(D_QUOTA,
		       "executing dquot_transfer inode %ld uid %d -> %d gid %d -> %d\n",
		       inode->i_ino, i_uid_read(inode), attr->la_uid,
		       i_gid_read(inode), attr->la_gid);

		dquot_initialize(inode);
		iattr.ia_valid = 0;
		if (attr->la_valid & LA_UID)
			iattr.ia_valid |= ATTR_UID;
		if (attr->la_valid & LA_GID)
			iattr.ia_valid |= ATTR_GID;
		iattr.ia_uid = make_kuid(&init_user_ns, attr->la_uid);
		iattr.ia_gid = make_kgid(&init_user_ns, attr->la_gid);

		lock_dquot_transfer(inode);
		rc = osd_dquot_transfer(&init_user_ns, inode, &iattr);
		unlock_dquot_transfer(inode);
		if (rc) {
			CERROR("%s: quota transfer failed. Is quota enforcement enabled on the ldiskfs filesystem? rc = %d\n",
			       osd_ino2name(inode), rc);
			return rc;
		}
	}

	/* Handle project id transfer here properly */
	if (attr->la_valid & LA_PROJID &&
	    attr->la_projid != i_projid_read(inode)) {
		if (!projid_valid(make_kprojid(&init_user_ns, attr->la_projid)))
			return -EINVAL;
#ifdef HAVE_PROJECT_QUOTA
		rc = osd_transfer_project(inode, attr->la_projid, handle);
#else
		rc = -ENOTSUPP;
#endif
		if (rc) {
			CERROR("%s: quota transfer failed. Is project enforcement enabled on the ldiskfs filesystem? rc = %d\n",
			       osd_ino2name(inode), rc);
			return rc;
		}
	}
	return 0;
}

static int osd_attr_set(const struct lu_env *env,
			struct dt_object *dt,
			const struct lu_attr *attr,
			struct thandle *handle)
{
	struct osd_thread_info *info = osd_oti_get(env);
	struct osd_object *obj = osd_dt_obj(dt);
	struct osd_device *osd = osd_obj2dev(obj);
	struct inode *inode;
	int rc;

	if (!dt_object_exists(dt))
		return -ENOENT;

	LASSERT(handle != NULL);
	LASSERT(!dt_object_remote(dt));
	LASSERT(osd_invariant(obj));

	osd_trans_exec_op(env, handle, OSD_OT_ATTR_SET);

	if (CFS_FAIL_CHECK(OBD_FAIL_OSD_FID_MAPPING) &&
	    !osd_obj2dev(obj)->od_is_ost) {
		struct osd_thread_info *oti = osd_oti_get(env);
		const struct lu_fid *fid0 = lu_object_fid(&dt->do_lu);
		struct lu_fid *fid1 = &oti->oti_fid;
		struct osd_inode_id *id = &oti->oti_id;
		struct iam_path_descr *ipd;
		struct iam_container *bag;
		struct osd_thandle *oh;
		int rc;

		fid_cpu_to_be(fid1, fid0);
		memset(id, 1, sizeof(*id));
		bag = &osd_fid2oi(osd_dev(dt->do_lu.lo_dev),
				  fid0)->oi_dir.od_container;
		ipd = osd_idx_ipd_get(env, bag);
		if (unlikely(ipd == NULL))
			RETURN(-ENOMEM);

		oh = container_of(handle, struct osd_thandle, ot_super);
		rc = iam_update(oh->ot_handle, bag,
				(const struct iam_key *)fid1,
				(const struct iam_rec *)id, ipd);
		osd_ipd_put(env, bag, ipd);
		return(rc > 0 ? 0 : rc);
	}

	inode = obj->oo_inode;

	rc = osd_quota_transfer(inode, attr, handle);
	if (rc)
		return rc;

	spin_lock(&obj->oo_guard);
	rc = osd_inode_setattr(env, inode, attr);
	spin_unlock(&obj->oo_guard);
	if (rc != 0)
		GOTO(out, rc);

	osd_dirty_inode(inode, I_DIRTY_DATASYNC);

	osd_trans_exec_check(env, handle, OSD_OT_ATTR_SET);

	if (!(attr->la_valid & LA_FLAGS))
		GOTO(out, rc);

	/* If setting LUSTRE_ENCRYPT_FL on an OST object, also set a dummy
	 * enc ctx xattr, with 2 benefits:
	 * - setting the LL_XATTR_NAME_ENCRYPTION_CONTEXT xattr internally sets
	 *   the LDISKFS_ENCRYPT_FL flag on the on-disk inode;
	 * - it makes e2fsprogs happy to see an enc ctx for an inode that has
	 *   the LDISKFS_ENCRYPT_FL flag
	 * We do not need the actual encryption context on OST objects, it is
	 * only stored on MDT inodes, at file creation time.
	 */
	if (!(LDISKFS_I(obj->oo_inode)->i_flags & LDISKFS_ENCRYPT_FL) &&
	    attr->la_flags & LUSTRE_ENCRYPT_FL && osd->od_is_ost &&
	    !CFS_FAIL_CHECK(OBD_FAIL_LFSCK_NO_ENCFLAG)) {
		struct lu_buf buf;

		/* use a dummy enc ctx, fine with e2fsprogs */
		buf.lb_buf = "\xFF";
		buf.lb_len = 1;
		rc = osd_xattr_set(env, dt, &buf,
				   LL_XATTR_NAME_ENCRYPTION_CONTEXT,
				   0, handle);
		if (rc)
			CWARN("%s: set "DFID" enc ctx failed: rc = %d\n",
			      osd_name(osd), PFID(lu_object_fid(&dt->do_lu)),
			      rc);
	}

	/* Let's check if there are extra flags need to be set into LMA */
	if (attr->la_flags & LUSTRE_LMA_FL_MASKS) {
		struct lustre_mdt_attrs *lma = &info->oti_ost_attrs.loa_lma;

		LASSERT(!obj->oo_pfid_in_lma);

		rc = osd_get_lma(info, inode, &info->oti_obj_dentry,
				 &info->oti_ost_attrs);
		if (rc)
			GOTO(out, rc);

		if ((lma->lma_incompat & lustre_to_lma_flags(attr->la_flags)) ==
		    lustre_to_lma_flags(attr->la_flags))
			/* if lma incompat already has the flags,
			 * save a useless call to xattr_set
			 */
			GOTO(out, rc = 0);

		lma->lma_incompat |=
			lustre_to_lma_flags(attr->la_flags);
		lustre_lma_swab(lma);

		osd_trans_exec_op(env, handle, OSD_OT_XATTR_SET);

		rc = __osd_xattr_set(info, inode, XATTR_NAME_LMA,
				     lma, sizeof(*lma), XATTR_REPLACE);
		if (rc != 0)
			CWARN("%s: set "DFID" lma flags %u failed: rc = %d\n",
			      osd_name(osd), PFID(lu_object_fid(&dt->do_lu)),
			      lma->lma_incompat, rc);
		else
			obj->oo_lma_flags =
				attr->la_flags & LUSTRE_LMA_FL_MASKS;
		osd_trans_exec_check(env, handle, OSD_OT_XATTR_SET);
	}

out:
	return rc;
}

static struct dentry *osd_child_dentry_get(const struct lu_env *env,
					   struct osd_object *obj,
					   const char *name, const int namelen)
{
	return osd_child_dentry_by_inode(env, obj->oo_inode, name, namelen);
}

static int osd_mkfile(struct osd_thread_info *info, struct osd_object *obj,
		      umode_t mode, struct dt_allocation_hint *hint,
		      struct thandle *th, struct lu_attr *attr)
{
	int result;
	struct osd_device *osd = osd_obj2dev(obj);
	struct osd_thandle *oth;
	struct dt_object *parent = NULL;
	struct inode *inode;
	struct iattr iattr = {
		.ia_valid = ATTR_UID | ATTR_GID |
			    ATTR_CTIME | ATTR_MTIME | ATTR_ATIME,
		.ia_ctime.tv_sec = attr->la_ctime,
		.ia_mtime.tv_sec = attr->la_mtime,
		.ia_atime.tv_sec = attr->la_atime,
		.ia_uid = GLOBAL_ROOT_UID,
		.ia_gid = GLOBAL_ROOT_GID,
	};
	const struct osd_timespec omit = { .tv_nsec = UTIME_OMIT };

	if (attr->la_valid & LA_UID)
		iattr.ia_uid = make_kuid(&init_user_ns, attr->la_uid);
	if (attr->la_valid & LA_GID)
		iattr.ia_gid = make_kgid(&init_user_ns, attr->la_gid);

	LINVRNT(osd_invariant(obj));
	LASSERT(obj->oo_inode == NULL);
	LASSERT(obj->oo_hl_head == NULL);

	if (S_ISDIR(mode) && ldiskfs_pdo) {
		obj->oo_hl_head =
			ldiskfs_htree_lock_head_alloc(HTREE_HBITS_DEF);
		if (obj->oo_hl_head == NULL)
			return -ENOMEM;
	}

	oth = container_of(th, struct osd_thandle, ot_super);
	LASSERT(oth->ot_handle->h_transaction != NULL);

	if (hint != NULL && hint->dah_parent != NULL &&
	    !dt_object_remote(hint->dah_parent))
		parent = hint->dah_parent;

	/* if a time component is not valid set it to UTIME_OMIT */
	if (!(attr->la_valid & LA_CTIME))
		iattr.ia_ctime = omit;
	if (!(attr->la_valid & LA_MTIME))
		iattr.ia_mtime = omit;
	if (!(attr->la_valid & LA_ATIME))
		iattr.ia_atime = omit;

	inode = ldiskfs_create_inode(oth->ot_handle,
				     parent ? osd_dt_obj(parent)->oo_inode :
					      osd_sb(osd)->s_root->d_inode,
				     mode, &iattr);
	if (!IS_ERR(inode)) {
		/* Do not update file c/mtime in ldiskfs. */
		inode->i_flags |= S_NOCMTIME;

		/*
		 * For new created object, it must be consistent,
		 * and it is unnecessary to scrub against it.
		 */
		ldiskfs_set_inode_state(inode, LDISKFS_STATE_LUSTRE_NOSCRUB);

		obj->oo_inode = inode;
		result = 0;
	} else {
		if (obj->oo_hl_head != NULL) {
			ldiskfs_htree_lock_head_free(obj->oo_hl_head);
			obj->oo_hl_head = NULL;
		}
		result = PTR_ERR(inode);
	}
	LINVRNT(osd_invariant(obj));
	return result;
}

enum {
	OSD_NAME_LEN = 255
};

static int osd_mkdir(struct osd_thread_info *info, struct osd_object *obj,
		     struct lu_attr *attr,
		     struct dt_allocation_hint *hint,
		     struct dt_object_format *dof,
		     struct thandle *th)
{
	int result;
	struct osd_thandle *oth;
	__u32 mode = (attr->la_mode & (S_IFMT | S_IRWXUGO | S_ISVTX | S_ISGID));

	LASSERT(S_ISDIR(attr->la_mode));

	oth = container_of(th, struct osd_thandle, ot_super);
	LASSERT(oth->ot_handle->h_transaction != NULL);
	if (fid_is_namespace_visible(lu_object_fid(&obj->oo_dt.do_lu)))
		obj->oo_dirent_count = 0;
	result = osd_mkfile(info, obj, mode, hint, th, attr);

	return result;
}

static int osd_mk_index(struct osd_thread_info *info, struct osd_object *obj,
			struct lu_attr *attr,
			struct dt_allocation_hint *hint,
			struct dt_object_format *dof,
			struct thandle *th)
{
	int result;
	struct osd_thandle *oth;
	const struct dt_index_features *feat = dof->u.dof_idx.di_feat;

	__u32 mode = (attr->la_mode & (S_IFMT | S_IALLUGO | S_ISVTX));

	LASSERT(S_ISREG(attr->la_mode));

	oth = container_of(th, struct osd_thandle, ot_super);
	LASSERT(oth->ot_handle->h_transaction != NULL);

	result = osd_mkfile(info, obj, mode, hint, th, attr);
	if (result == 0) {
		LASSERT(obj->oo_inode != NULL);
		if (feat->dif_flags & DT_IND_VARKEY)
			result = iam_lvar_create(obj->oo_inode,
						 feat->dif_keysize_max,
						 feat->dif_ptrsize,
						 feat->dif_recsize_max,
						 oth->ot_handle);
		else
			result = iam_lfix_create(obj->oo_inode,
						 feat->dif_keysize_max,
						 feat->dif_ptrsize,
						 feat->dif_recsize_max,
						 oth->ot_handle);
	}
	return result;
}

static int osd_mkreg(struct osd_thread_info *info, struct osd_object *obj,
		     struct lu_attr *attr,
		     struct dt_allocation_hint *hint,
		     struct dt_object_format *dof,
		     struct thandle *th)
{
	LASSERT(S_ISREG(attr->la_mode));
	return osd_mkfile(info, obj, (attr->la_mode &
			 (S_IFMT | S_IALLUGO | S_ISVTX)), hint, th,
			  attr);
}

static int osd_mksym(struct osd_thread_info *info, struct osd_object *obj,
		     struct lu_attr *attr,
		     struct dt_allocation_hint *hint,
		     struct dt_object_format *dof,
		     struct thandle *th)
{
	LASSERT(S_ISLNK(attr->la_mode));
	return osd_mkfile(info, obj, (attr->la_mode &
			 (S_IFMT | S_IALLUGO | S_ISVTX)), hint, th,
			  attr);
}

static int osd_mknod(struct osd_thread_info *info, struct osd_object *obj,
		     struct lu_attr *attr,
		     struct dt_allocation_hint *hint,
		     struct dt_object_format *dof,
		     struct thandle *th)
{
	umode_t mode = attr->la_mode & (S_IFMT | S_IALLUGO | S_ISVTX);
	int result;

	LINVRNT(osd_invariant(obj));
	LASSERT(obj->oo_inode == NULL);
	LASSERT(S_ISCHR(mode) || S_ISBLK(mode) ||
		S_ISFIFO(mode) || S_ISSOCK(mode));

	result = osd_mkfile(info, obj, mode, hint, th, attr);
	if (result == 0) {
		LASSERT(obj->oo_inode != NULL);
		/*
		 * This inode should be marked dirty for i_rdev.  Currently
		 * that is done in the osd_attr_init().
		 */
		init_special_inode(obj->oo_inode, obj->oo_inode->i_mode,
				   attr->la_rdev);
	}
	LINVRNT(osd_invariant(obj));
	return result;
}

typedef int (*osd_obj_type_f)(struct osd_thread_info *, struct osd_object *,
			      struct lu_attr *,
			      struct dt_allocation_hint *hint,
			      struct dt_object_format *dof,
			      struct thandle *);

static osd_obj_type_f osd_create_type_f(enum dt_format_type type)
{
	osd_obj_type_f result;

	switch (type) {
	case DFT_DIR:
		result = osd_mkdir;
		break;
	case DFT_REGULAR:
		result = osd_mkreg;
		break;
	case DFT_SYM:
		result = osd_mksym;
		break;
	case DFT_NODE:
		result = osd_mknod;
		break;
	case DFT_INDEX:
		result = osd_mk_index;
		break;

	default:
		LBUG();
		break;
	}
	return result;
}

static void osd_ah_init(const struct lu_env *env, struct dt_allocation_hint *ah,
			struct dt_object *parent, struct dt_object *child,
			umode_t child_mode)
{
	LASSERT(ah);

	ah->dah_parent = parent;

	if (parent != NULL && !dt_object_remote(parent)) {
		/* will help to find FID->ino at dt_insert("..") */
		struct osd_object *pobj = osd_dt_obj(parent);

		osd_idc_find_and_init(env, osd_obj2dev(pobj), pobj);
	}
}

static void osd_attr_init(struct osd_thread_info *info, struct osd_object *obj,
			  struct lu_attr *attr, struct dt_object_format *dof,
			  struct thandle *handle)
{
	struct inode *inode = obj->oo_inode;
	__u64 valid = attr->la_valid;
	int result;

	attr->la_valid &= ~(LA_TYPE | LA_MODE);

	if (dof->dof_type != DFT_NODE)
		attr->la_valid &= ~LA_RDEV;
	if ((valid & LA_ATIME) && (attr->la_atime == inode->i_atime.tv_sec))
		attr->la_valid &= ~LA_ATIME;
	if ((valid & LA_CTIME) && (attr->la_ctime == inode->i_ctime.tv_sec))
		attr->la_valid &= ~LA_CTIME;
	if ((valid & LA_MTIME) && (attr->la_mtime == inode->i_mtime.tv_sec))
		attr->la_valid &= ~LA_MTIME;

	result = osd_quota_transfer(inode, attr, handle);
	if (result)
		return;

	if (attr->la_valid != 0) {
		result = osd_inode_setattr(info->oti_env, inode, attr);
		/*
		 * The osd_inode_setattr() should always succeed here.  The
		 * only error that could be returned is EDQUOT when we are
		 * trying to change the UID or GID of the inode. However, this
		 * should not happen since quota enforcement is no longer
		 * enabled on ldiskfs (lquota takes care of it).
		 */
		LASSERTF(result == 0, "%d\n", result);
		osd_dirty_inode(inode, I_DIRTY_DATASYNC);
	}

	attr->la_valid = valid;
}

/**
 * Helper function for osd_create()
 *
 * \retval 0, on success
 */
static int __osd_create(struct osd_thread_info *info, struct osd_object *obj,
			struct lu_attr *attr, struct dt_allocation_hint *hint,
			struct dt_object_format *dof, struct thandle *th)
{
	int result;
	__u32 umask;

	osd_trans_exec_op(info->oti_env, th, OSD_OT_CREATE);

	/* we drop umask so that permissions we pass are not affected */
	umask = current->fs->umask;
	current->fs->umask = 0;

	result = osd_create_type_f(dof->dof_type)(info, obj, attr, hint, dof,
						  th);
	if (likely(obj->oo_inode != NULL)) {
		LASSERT(obj->oo_inode->i_state & I_NEW);

		/*
		 * Unlock the inode before attr initialization to avoid
		 * unnecessary dqget operations. LU-6378
		 */
		unlock_new_inode(obj->oo_inode);
	}

	if (likely(result == 0)) {
		osd_attr_init(info, obj, attr, dof, th);
		osd_object_init0(obj);
	}

	/* restore previous umask value */
	current->fs->umask = umask;

	osd_trans_exec_check(info->oti_env, th, OSD_OT_CREATE);

	return result;
}

/**
 * Helper function for osd_create()
 *
 * \retval 0, on success
 */
static int __osd_oi_insert(const struct lu_env *env, struct osd_object *obj,
			   const struct lu_fid *fid, struct thandle *th)
{
	struct osd_thread_info *info = osd_oti_get(env);
	struct osd_inode_id    *id   = &info->oti_id;
	struct osd_device      *osd  = osd_obj2dev(obj);
	struct osd_thandle     *oh;
	int rc;

	LASSERT(obj->oo_inode != NULL);

	if (CFS_FAIL_CHECK(OBD_FAIL_OSD_OI_ENOSPC))
		return -ENOSPC;

	oh = container_of(th, struct osd_thandle, ot_super);
	LASSERT(oh->ot_handle);
	osd_trans_exec_op(env, th, OSD_OT_INSERT);

	osd_id_gen(id, obj->oo_inode->i_ino, obj->oo_inode->i_generation);
	rc = osd_oi_insert(info, osd, fid, id, oh->ot_handle,
			   OI_CHECK_FLD, NULL);
	if (CFS_FAIL_CHECK(OBD_FAIL_OSD_DUPLICATE_MAP) && osd->od_is_ost) {
		struct lu_fid next_fid = *fid;

		/* insert next object in advance, and map to the same inode */
		next_fid.f_oid++;
		if (next_fid.f_oid != 0) {
			osd_trans_exec_op(env, th, OSD_OT_INSERT);
			osd_oi_insert(info, osd, &next_fid, id, oh->ot_handle,
				      OI_CHECK_FLD, NULL);
			osd_trans_exec_check(env, th, OSD_OT_INSERT);
		}
	}

	osd_trans_exec_check(env, th, OSD_OT_INSERT);

	return rc;
}

int osd_fld_lookup(const struct lu_env *env, struct osd_device *osd,
		   u64 seq, struct lu_seq_range *range)
{
	struct seq_server_site *ss = osd_seq_site(osd);

	if (fid_seq_is_idif(seq)) {
		fld_range_set_ost(range);
		range->lsr_index = idif_ost_idx(seq);
		return 0;
	}

	if (!fid_seq_in_fldb(seq)) {
		fld_range_set_mdt(range);
		if (ss != NULL)
			/*
			 * FIXME: If ss is NULL, it suppose not get lsr_index
			 * at all
			 */
			range->lsr_index = ss->ss_node_id;
		return 0;
	}

	LASSERT(ss != NULL);
	fld_range_set_any(range);
	/* OSD will only do local fld lookup */
	return fld_local_lookup(env, ss->ss_server_fld, seq, range);
}

static int osd_declare_create(const struct lu_env *env, struct dt_object *dt,
			      struct lu_attr *attr,
			      struct dt_allocation_hint *hint,
			      struct dt_object_format *dof,
			      struct thandle *handle)
{
	struct osd_thandle *oh;
	struct super_block *sb = osd_sb(osd_dev(dt->do_lu.lo_dev));
	int credits;
	int rc;

	ENTRY;

	LASSERT(handle != NULL);

	oh = container_of(handle, struct osd_thandle, ot_super);
	LASSERT(oh->ot_handle == NULL);

	if (osd_tx_was_declared(env, oh, dt, DTO_OBJECT_CREATE, 0))
		RETURN(0);

	/*
	 * EA object consumes more credits than regular object: osd_mk_index
	 * vs. osd_mkreg: osd_mk_index will create 2 blocks for root_node and
	 * leaf_node, could involves the block, block bitmap, groups, GDT
	 * change for each block, so add 4 * 2 credits in that case.
	 *
	 * The default ACL initialization may consume an additional 16 blocks
	 */
	credits = osd_dto_credits_noquota[DTO_OBJECT_CREATE] +
		  ((dof->dof_type == DFT_INDEX) ? 4 * 2 : 0);

	/**
	 * While ldiskfs_new_inode() calls ldiskfs_init_acl() we have to add
	 * credits for possible default ACL creation in new inode
	 */
	if (hint && hint->dah_acl_len)
		credits += osd_calc_bkmap_credits(sb, NULL, 0, -1,
				(hint->dah_acl_len + sb->s_blocksize - 1) >>
				sb->s_blocksize_bits);

	osd_trans_declare_op(env, oh, OSD_OT_CREATE, credits);

	/*
	 * Reuse idle OI block may cause additional one OI block
	 * to be changed.
	 */
	osd_trans_declare_op(env, oh, OSD_OT_INSERT,
			     osd_dto_credits_noquota[DTO_INDEX_INSERT] + 1);
	if (CFS_FAIL_CHECK(OBD_FAIL_OSD_DUPLICATE_MAP))
		osd_trans_declare_op(env, oh, OSD_OT_INSERT,
			     osd_dto_credits_noquota[DTO_INDEX_INSERT] + 1);

	/* will help to find FID->ino mapping at dt_insert() */
	rc = osd_idc_find_and_init(env, osd_obj2dev(osd_dt_obj(dt)),
				   osd_dt_obj(dt));
	if (rc != 0)
		RETURN(rc);

	if (!attr)
		RETURN(0);

	rc = osd_declare_inode_qid(env, attr->la_uid, attr->la_gid,
				   attr->la_projid, 1, oh, osd_dt_obj(dt),
				   NULL, OSD_QID_INODE);
	if (rc != 0)
		RETURN(rc);

	RETURN(rc);
}

/**
 * Called to destroy on-disk representation of the object
 *
 * Concurrency: must be locked
 */
static int osd_declare_destroy(const struct lu_env *env, struct dt_object *dt,
			       struct thandle *th)
{
	struct osd_object *obj = osd_dt_obj(dt);
	struct inode *inode = obj->oo_inode;
	struct osd_thandle *oh;
	int rc;

	ENTRY;

	if (inode == NULL)
		RETURN(-ENOENT);

	oh = container_of(th, struct osd_thandle, ot_super);
	LASSERT(oh->ot_handle == NULL);

	osd_trans_declare_op(env, oh, OSD_OT_DESTROY,
			     osd_dto_credits_noquota[DTO_OBJECT_DELETE]);

	/* For removing agent entry */
	if (lu_object_has_agent_entry(&obj->oo_dt.do_lu))
		oh->ot_credits += osd_dto_credits_noquota[DTO_INDEX_DELETE];

	/*
	 * Recycle idle OI leaf may cause additional three OI blocks
	 * to be changed.
	 */
	if (!CFS_FAIL_CHECK(OBD_FAIL_LFSCK_LOST_MDTOBJ2))
		osd_trans_declare_op(env, oh, OSD_OT_DELETE,
			     osd_dto_credits_noquota[DTO_INDEX_DELETE] + 3);
	/* one less inode */
	rc = osd_declare_inode_qid(env, i_uid_read(inode), i_gid_read(inode),
				   i_projid_read(inode), -1, oh, obj, NULL,
				   OSD_QID_INODE);
	if (rc)
		RETURN(rc);
	/* data to be truncated */
	rc = osd_declare_inode_qid(env, i_uid_read(inode), i_gid_read(inode),
				   i_projid_read(inode), 0, oh, obj, NULL,
				   OSD_QID_BLK);
	if (rc)
		RETURN(rc);

	/*
	 * will help to find FID->ino when this object is being
	 * added to PENDING
	 */
	rc = osd_idc_find_and_init(env, osd_obj2dev(obj), obj);

	RETURN(rc);
}

static int osd_destroy(const struct lu_env *env, struct dt_object *dt,
		       struct thandle *th)
{
	const struct lu_fid *fid = lu_object_fid(&dt->do_lu);
	struct osd_object *obj = osd_dt_obj(dt);
	struct inode *inode = obj->oo_inode;
	struct osd_device *osd = osd_obj2dev(obj);
	struct osd_thandle *oh;
	int result;

	ENTRY;

	oh = container_of(th, struct osd_thandle, ot_super);
	LASSERT(oh->ot_handle);
	LASSERT(inode);
	LASSERT(!lu_object_is_dying(dt->do_lu.lo_header));

	if (unlikely(fid_is_acct(fid)))
		RETURN(-EPERM);

	if (lu_object_has_agent_entry(&obj->oo_dt.do_lu)) {
		result = osd_delete_from_remote_parent(env, osd, obj, oh, true);
		if (result != 0)
			CERROR("%s: remove agent entry "DFID": rc = %d\n",
			       osd_name(osd), PFID(fid), result);
	}

	if (S_ISDIR(inode->i_mode)) {
		if (inode->i_nlink > 2)
			CERROR("%s: directory "DFID" ino %lu link count is %u at unlink. run e2fsck to repair\n",
			       osd_name(osd), PFID(fid), inode->i_ino,
			       inode->i_nlink);

		spin_lock(&obj->oo_guard);
		clear_nlink(inode);
		spin_unlock(&obj->oo_guard);
		osd_dirty_inode(inode, I_DIRTY_DATASYNC);
	}

	osd_trans_exec_op(env, th, OSD_OT_DESTROY);

	ldiskfs_set_inode_state(inode, LDISKFS_STATE_LUSTRE_DESTROY);

	if (!CFS_FAIL_CHECK(OBD_FAIL_LFSCK_LOST_MDTOBJ2))
		result = osd_oi_delete(osd_oti_get(env), osd, fid,
				       oh->ot_handle, OI_CHECK_FLD);

	osd_trans_exec_check(env, th, OSD_OT_DESTROY);
	/* XXX: add to ext3 orphan list */
	/* rc = ext3_orphan_add(handle_t *handle, struct inode *inode) */

	/* not needed in the cache anymore */
	set_bit(LU_OBJECT_HEARD_BANSHEE, &dt->do_lu.lo_header->loh_flags);
	obj->oo_destroyed = 1;

	RETURN(0);
}

/**
 * Put the fid into lustre_mdt_attrs, and then place the structure
 * inode's ea. This fid should not be altered during the life time
 * of the inode.
 *
 * \retval +ve, on success
 * \retval -ve, on error
 *
 * FIXME: It is good to have/use ldiskfs_xattr_set_handle() here
 */
int osd_ea_fid_set(struct osd_thread_info *info, struct inode *inode,
		   const struct lu_fid *fid, __u32 compat, __u32 incompat)
{
	struct lustre_ost_attrs *loa = &info->oti_ost_attrs;
	struct lustre_mdt_attrs *lma = &loa->loa_lma;
	int rc;

	ENTRY;

	if (CFS_FAIL_CHECK(OBD_FAIL_FID_INLMA))
		RETURN(0);

	if (CFS_FAIL_CHECK(OBD_FAIL_OSD_OST_EA_FID_SET))
		rc = -ENOMEM;

	lustre_loa_init(loa, fid, compat, incompat);
	lustre_loa_swab(loa, false);

	/*
	 * For the OST device with 256 bytes inode size by default,
	 * the PFID EA will be stored together with LMA EA to avoid
	 * performance trouble. Otherwise the PFID EA can be stored
	 * independently. LU-8998
	 */
	if ((compat & LMAC_FID_ON_OST) &&
	    LDISKFS_INODE_SIZE(inode->i_sb) <= 256)
		rc = __osd_xattr_set(info, inode, XATTR_NAME_LMA, loa,
				     sizeof(*loa), XATTR_CREATE);
	else
		rc = __osd_xattr_set(info, inode, XATTR_NAME_LMA, lma,
				     sizeof(*lma), XATTR_CREATE);
	/*
	 * LMA may already exist, but we need to check that all the
	 * desired compat/incompat flags have been added.
	 */
	if (unlikely(rc == -EEXIST)) {
		rc = __osd_xattr_get(inode, &info->oti_obj_dentry,
				     XATTR_NAME_LMA, (void *)loa, sizeof(*loa));
		if (rc < 0)
			RETURN(rc);

		if (rc < sizeof(*lma))
			RETURN(-EINVAL);

		lustre_loa_swab(loa, true);
		if (lu_fid_eq(fid, &lma->lma_self_fid) &&
		    ((compat == 0 && incompat == 0) ||
		     (!(~lma->lma_compat & compat) &&
		      !(~lma->lma_incompat & incompat))))
			RETURN(0);

		lma->lma_self_fid = *fid;
		lma->lma_compat |= compat;
		lma->lma_incompat |= incompat;
		if (rc == sizeof(*lma)) {
			lustre_lma_swab(lma);
			rc = __osd_xattr_set(info, inode, XATTR_NAME_LMA, lma,
					     sizeof(*lma), XATTR_REPLACE);
		} else {
			lustre_loa_swab(loa, false);
			rc = __osd_xattr_set(info, inode, XATTR_NAME_LMA, loa,
					     sizeof(*loa), XATTR_REPLACE);
		}
	}

	RETURN(rc);
}

/**
 * ldiskfs supports fid in dirent, it is passed in dentry->d_fsdata.
 * lustre 1.8 also uses d_fsdata for passing other info to ldiskfs.
 * To have compatilibility with 1.8 ldiskfs driver we need to have
 * magic number at start of fid data.
 * \ldiskfs_dentry_param is used only to pass fid from osd to ldiskfs.
 * its inmemory API.
 */
static void osd_get_ldiskfs_dirent_param(struct ldiskfs_dentry_param *param,
					 const struct lu_fid *fid)
{
	if (!fid_is_namespace_visible(fid) ||
	    CFS_FAIL_CHECK(OBD_FAIL_FID_IGIF)) {
		param->edp_magic = 0;
		return;
	}

	param->edp_magic = LDISKFS_LUFID_MAGIC;
	param->edp_len =  sizeof(struct lu_fid) + 1;
	fid_cpu_to_be((struct lu_fid *)param->edp_data, (struct lu_fid *)fid);
}

/**
 * Try to read the fid from inode ea into dt_rec.
 *
 * \param fid object fid.
 *
 * \retval 0 on success
 */
static int osd_ea_fid_get(const struct lu_env *env, struct osd_object *obj,
			  __u32 ino, struct lu_fid *fid,
			  struct osd_inode_id *id)
{
	struct osd_thread_info *info  = osd_oti_get(env);
	struct inode *inode;

	ENTRY;

	osd_id_gen(id, ino, OSD_OII_NOGEN);
	inode = osd_iget_fid(info, osd_obj2dev(obj), id, fid);
	if (IS_ERR(inode))
		RETURN(PTR_ERR(inode));

	iput(inode);
	RETURN(0);
}

static int osd_add_dot_dotdot_internal(struct osd_thread_info *info,
					struct inode *dir,
					struct inode *parent_dir,
					const struct lu_fid *dot_fid,
					const struct lu_fid *dot_dot_fid,
					struct osd_thandle *oth)
{
	struct ldiskfs_dentry_param *dot_ldp;
	struct ldiskfs_dentry_param *dot_dot_ldp;
	__u32 saved_nlink = dir->i_nlink;
	int rc;

	if (CFS_FAIL_CHECK(OBD_FAIL_OSD_DOTDOT_ENOSPC))
		return -ENOSPC;

	dot_dot_ldp = (struct ldiskfs_dentry_param *)info->oti_ldp2;
	osd_get_ldiskfs_dirent_param(dot_dot_ldp, dot_dot_fid);

	dot_ldp = (struct ldiskfs_dentry_param *)info->oti_ldp;
	dot_ldp->edp_magic = 0;

	rc = ldiskfs_add_dot_dotdot(oth->ot_handle, parent_dir,
				    dir, dot_ldp, dot_dot_ldp);
	/*
	 * The ldiskfs_add_dot_dotdot() may dir->i_nlink as 2, then
	 * the subseqent ref_add() will increase the dir->i_nlink
	 * as 3. That is incorrect for new created directory.
	 *
	 * It looks like hack, because we want to make the OSD API
	 * to be order-independent for new created directory object
	 * between dt_insert(..) and ref_add() operations.
	 *
	 * Here, we only restore the in-RAM dir-inode's nlink attr,
	 * becuase if the nlink attr is not 2, then there will be
	 * ref_add() called following the dt_insert(..), such call
	 * will make both the in-RAM and on-disk dir-inode's nlink
	 * attr to be set as 2. LU-7447
	 */
	set_nlink(dir, saved_nlink);
	return rc;
}

/**
 * Create an local agent inode for remote entry
 */
static struct inode *osd_create_local_agent_inode(const struct lu_env *env,
						  struct osd_device *osd,
						  struct osd_object *pobj,
						  const struct lu_fid *fid,
						  __u32 type,
						  struct thandle *th)
{
	struct osd_thread_info *info = osd_oti_get(env);
	struct inode *local;
	struct osd_thandle *oh;
	struct iattr iattr = {
		.ia_valid = ATTR_UID | ATTR_GID |
			    ATTR_CTIME | ATTR_MTIME | ATTR_ATIME,
		.ia_ctime.tv_nsec = UTIME_OMIT,
		.ia_mtime.tv_nsec = UTIME_OMIT,
		.ia_atime.tv_nsec = UTIME_OMIT,
		.ia_uid = GLOBAL_ROOT_UID,
		.ia_gid = GLOBAL_ROOT_GID,
	};
	int rc;

	ENTRY;

	LASSERT(th);
	oh = container_of(th, struct osd_thandle, ot_super);
	LASSERT(oh->ot_handle->h_transaction != NULL);

	local = ldiskfs_create_inode(oh->ot_handle, pobj->oo_inode,
				     type, &iattr);
	if (IS_ERR(local)) {
		CERROR("%s: create local error %d\n", osd_name(osd),
		       (int)PTR_ERR(local));
		RETURN(local);
	}

	/*
	 * restore i_gid in case S_ISGID is set, we will inherit S_ISGID and set
	 * correct gid on remote file, not agent here
	 */
	local->i_gid = current_fsgid();
	ldiskfs_set_inode_state(local, LDISKFS_STATE_LUSTRE_NOSCRUB);

	/* e2fsck doesn't like empty symlinks.  Store remote FID as symlink.
	 * That gives e2fsck something to look at and be happy, and allows
	 * debugging if we need to determine where this symlink came from.
	 */
	if (S_ISLNK(type)) {
		BUILD_BUG_ON(LDISKFS_N_BLOCKS * 4 < FID_LEN + 1);
		ldiskfs_clear_inode_flag(local, LDISKFS_INODE_EXTENTS);
		rc = scnprintf((char *)LDISKFS_I(local)->i_data,
			       LDISKFS_N_BLOCKS * 4, DFID, PFID(fid));

		i_size_write(local, rc);
		LDISKFS_I(local)->i_disksize = rc;
	}
	unlock_new_inode(local);

	/* Agent inode should not have project ID */
#ifdef	HAVE_PROJECT_QUOTA
	if (LDISKFS_I(pobj->oo_inode)->i_flags & LUSTRE_PROJINHERIT_FL &&
	    i_projid_read(pobj->oo_inode) != 0) {
		rc = osd_transfer_project(local, 0, th);
		if (rc) {
			CERROR("%s: quota transfer failed:. Is project quota enforcement enabled on the ldiskfs filesystem? rc = %d\n",
			       osd_ino2name(local), rc);
			RETURN(ERR_PTR(rc));
		}
	}
#endif
	/* Set special LMA flag for local agent inode */
	rc = osd_ea_fid_set(info, local, fid, 0, LMAI_AGENT);
	if (rc != 0) {
		CERROR("%s: set LMA for "DFID" remote inode failed: rc = %d\n",
		       osd_name(osd), PFID(fid), rc);
		RETURN(ERR_PTR(rc));
	}

	if (!S_ISDIR(type))
		RETURN(local);

	rc = osd_add_dot_dotdot_internal(info, local, pobj->oo_inode, fid,
					 lu_object_fid(&pobj->oo_dt.do_lu),
					 oh);
	if (rc != 0) {
		CERROR("%s: "DFID" add dot dotdot error: rc = %d\n",
			osd_name(osd), PFID(fid), rc);
		RETURN(ERR_PTR(rc));
	}

	RETURN(local);
}

/**
 * when direntry is deleted, we have to take care of possible agent inode
 * referenced by that. unfortunately we can't do this at that point:
 * iget() within a running transaction leads to deadlock and we better do
 * not call that every delete declaration to save performance. so we put
 * a potention agent inode on a list and process that once the transaction
 * is over. Notice it's not any worse in terms of real orphans as regular
 * object destroy doesn't put inodes on the on-disk orphan list. this should
 * be addressed separately
 */
static int osd_schedule_agent_inode_removal(const struct lu_env *env,
					    struct osd_thandle *oh,
					    __u32 ino)
{
	struct osd_device *osd = osd_dt_dev(oh->ot_super.th_dev);
	struct osd_obj_orphan *oor;

	OBD_ALLOC_PTR(oor);
	if (oor == NULL)
		return -ENOMEM;

	oor->oor_ino = ino;
	oor->oor_env = (struct lu_env *)env;
	spin_lock(&osd->od_osfs_lock);
	list_add(&oor->oor_list, &osd->od_orphan_list);
	spin_unlock(&osd->od_osfs_lock);

	oh->ot_remove_agents = 1;

	return 0;

}

static int osd_process_scheduled_agent_removals(const struct lu_env *env,
						struct osd_device *osd)
{
	struct osd_thread_info *info = osd_oti_get(env);
	struct osd_obj_orphan *oor, *tmp;
	struct osd_inode_id id;
	LIST_HEAD(list);
	struct inode *inode;
	struct lu_fid fid;
	handle_t *jh;
	__u32 ino;

	spin_lock(&osd->od_osfs_lock);
	list_for_each_entry_safe(oor, tmp, &osd->od_orphan_list, oor_list) {
		if (oor->oor_env == env)
			list_move(&oor->oor_list, &list);
	}
	spin_unlock(&osd->od_osfs_lock);

	list_for_each_entry_safe(oor, tmp, &list, oor_list) {

		ino = oor->oor_ino;

		list_del(&oor->oor_list);
		OBD_FREE_PTR(oor);

		osd_id_gen(&id, ino, OSD_OII_NOGEN);
		inode = osd_iget_fid(info, osd, &id, &fid);
		if (IS_ERR(inode))
			continue;

		if (!osd_remote_fid(env, osd, &fid)) {
			iput(inode);
			continue;
		}

		jh = osd_journal_start_sb(osd_sb(osd), LDISKFS_HT_MISC, 1);
		clear_nlink(inode);
		mark_inode_dirty(inode);
		ldiskfs_journal_stop(jh);
		iput(inode);
	}

	return 0;
}

/**
 * OSD layer object create function for OST objects (b=11826).
 *
 * The FID is inserted into inode xattr here.
 *
 * \retval   0, on success
 * \retval -ve, on error
 */
static int osd_create(const struct lu_env *env, struct dt_object *dt,
		      struct lu_attr *attr, struct dt_allocation_hint *hint,
		      struct dt_object_format *dof, struct thandle *th)
{
	const struct lu_fid *fid = lu_object_fid(&dt->do_lu);
	struct osd_object *obj = osd_dt_obj(dt);
	struct osd_thread_info *info = osd_oti_get(env);
	int result, on_ost = 0;

	ENTRY;

	if (dt_object_exists(dt))
		RETURN(-EEXIST);

	LINVRNT(osd_invariant(obj));
	LASSERT(!dt_object_remote(dt));
	LASSERT(osd_is_write_locked(env, obj));
	LASSERT(th != NULL);

	if (unlikely(fid_is_acct(fid)))
		/*
		 * Quota files can't be created from the kernel any more,
		 * 'tune2fs -O quota' will take care of creating them
		 */
		RETURN(-EPERM);

	result = __osd_create(info, obj, attr, hint, dof, th);
	if (result == 0) {
		if (fid_is_idif(fid) &&
		    !osd_dev(dt->do_lu.lo_dev)->od_index_in_idif) {
			struct lu_fid *tfid = &info->oti_fid;
			struct ost_id *oi   = &info->oti_ostid;

			fid_to_ostid(fid, oi);
			ostid_to_fid(tfid, oi, 0);
			on_ost = 1;
			result = osd_ea_fid_set(info, obj->oo_inode, tfid,
						LMAC_FID_ON_OST, 0);
		} else {
			on_ost = fid_is_on_ost(info, osd_obj2dev(obj),
					       fid, OI_CHECK_FLD);
			result = osd_ea_fid_set(info, obj->oo_inode, fid,
						on_ost ? LMAC_FID_ON_OST : 0,
						0);
		}
		if (obj->oo_dt.do_body_ops == &osd_body_ops_new)
			obj->oo_dt.do_body_ops = &osd_body_ops;
	}

	if (!result && !CFS_FAIL_CHECK(OBD_FAIL_OSD_NO_OI_ENTRY)) {
		struct inode *inode = obj->oo_inode;

		result = __osd_oi_insert(env, obj, fid, th);
		if (result && inode) {
			spin_lock(&obj->oo_guard);
			clear_nlink(inode);
			spin_unlock(&obj->oo_guard);
			osd_dirty_inode(inode, I_DIRTY_DATASYNC);
			ldiskfs_set_inode_state(inode,
						LDISKFS_STATE_LUSTRE_DESTROY);
			iput(inode);
			obj->oo_inode = NULL;
		}
	}

	/*
	 * a small optimization - dt_insert() isn't usually applied
	 * to OST objects, so we don't need to cache OI mapping for
	 * OST objects
	 */
	if (result == 0 && on_ost == 0) {
		struct osd_device *osd = osd_dev(dt->do_lu.lo_dev);

		result = osd_idc_find_and_init(env, osd, obj);
		LASSERT(result == 0);
	}

	LASSERT(ergo(result == 0,
		     dt_object_exists(dt) && !dt_object_remote(dt)));
	LINVRNT(osd_invariant(obj));
	RETURN(result);
}

static int osd_declare_ref_add(const struct lu_env *env, struct dt_object *dt,
			       struct thandle *handle)
{
	struct osd_thandle *oh;
	int rc;

	/* it's possible that object doesn't exist yet */
	LASSERT(handle != NULL);

	oh = container_of(handle, struct osd_thandle, ot_super);
	LASSERT(oh->ot_handle == NULL);

	osd_trans_declare_op(env, oh, OSD_OT_REF_ADD,
			     osd_dto_credits_noquota[DTO_ATTR_SET_BASE]);

	rc = osd_idc_find_and_init(env, osd_dev(dt->do_lu.lo_dev),
				   osd_dt_obj(dt));

	return rc;
}

/*
 * Concurrency: @dt is write locked.
 */
static int osd_ref_add(const struct lu_env *env, struct dt_object *dt,
		       struct thandle *th)
{
	struct osd_object *obj = osd_dt_obj(dt);
	struct inode *inode = obj->oo_inode;
	struct osd_thandle *oh;
	int rc = 0;

	if (!dt_object_exists(dt) || obj->oo_destroyed)
		return -ENOENT;

	LINVRNT(osd_invariant(obj));
	LASSERT(!dt_object_remote(dt));
	LASSERT(osd_is_write_locked(env, obj));
	LASSERT(th != NULL);

	oh = container_of(th, struct osd_thandle, ot_super);
	LASSERT(oh->ot_handle != NULL);

	osd_trans_exec_op(env, th, OSD_OT_REF_ADD);

	CDEBUG(D_INODE, DFID" increase nlink %d\n",
	       PFID(lu_object_fid(&dt->do_lu)), inode->i_nlink);
	/*
	 * The DIR_NLINK feature allows directories to exceed LDISKFS_LINK_MAX
	 * (65000) subdirectories by storing "1" in i_nlink if the link count
	 * would otherwise overflow. Directory tranversal tools understand
	 * that (st_nlink == 1) indicates that the filesystem dose not track
	 * hard links count on the directory, and will not abort subdirectory
	 * scanning early once (st_nlink - 2) subdirs have been found.
	 *
	 * This also has to properly handle the case of inodes with nlink == 0
	 * in case they are being linked into the PENDING directory
	 */
	spin_lock(&obj->oo_guard);
	if (unlikely(inode->i_nlink == 0))
		/* inc_nlink from 0 may cause WARN_ON */
		set_nlink(inode, 1);
	else {
		osd_ldiskfs_inc_count(oh->ot_handle, inode);
		if (!S_ISDIR(inode->i_mode))
			LASSERT(inode->i_nlink <= LDISKFS_LINK_MAX);
	}
	spin_unlock(&obj->oo_guard);

	osd_dirty_inode(inode, I_DIRTY_DATASYNC);
	LINVRNT(osd_invariant(obj));

	osd_trans_exec_check(env, th, OSD_OT_REF_ADD);

	return rc;
}

static int osd_declare_ref_del(const struct lu_env *env, struct dt_object *dt,
			       struct thandle *handle)
{
	struct osd_thandle *oh;

	if (!dt_object_exists(dt))
		return -ENOENT;

	LASSERT(!dt_object_remote(dt));
	LASSERT(handle != NULL);

	oh = container_of(handle, struct osd_thandle, ot_super);
	LASSERT(oh->ot_handle == NULL);

	osd_trans_declare_op(env, oh, OSD_OT_REF_DEL,
			     osd_dto_credits_noquota[DTO_ATTR_SET_BASE]);

	return 0;
}

/*
 * Concurrency: @dt is write locked.
 */
static int osd_ref_del(const struct lu_env *env, struct dt_object *dt,
		       struct thandle *th)
{
	struct osd_object *obj = osd_dt_obj(dt);
	struct inode *inode = obj->oo_inode;
	struct osd_device *osd = osd_dev(dt->do_lu.lo_dev);
	struct osd_thandle *oh;

	if (!dt_object_exists(dt))
		return -ENOENT;

	LINVRNT(osd_invariant(obj));
	LASSERT(!dt_object_remote(dt));
	LASSERT(osd_is_write_locked(env, obj));
	LASSERT(th != NULL);

	if (CFS_FAIL_CHECK(OBD_FAIL_OSD_REF_DEL))
		return -EIO;

	oh = container_of(th, struct osd_thandle, ot_super);
	LASSERT(oh->ot_handle != NULL);

	osd_trans_exec_op(env, th, OSD_OT_REF_DEL);

	spin_lock(&obj->oo_guard);
	/*
	 * That can be result of upgrade from old Lustre version and
	 * applied only to local files.  Just skip this ref_del call.
	 * ext4_unlink() only treats this as a warning, don't LASSERT here.
	 */
	if (inode->i_nlink == 0) {
		CDEBUG_LIMIT(fid_is_norm(lu_object_fid(&dt->do_lu)) ?
			     D_ERROR : D_INODE, "%s: nlink == 0 on "DFID
			     ", maybe an upgraded file? (LU-3915)\n",
			     osd_name(osd), PFID(lu_object_fid(&dt->do_lu)));
		spin_unlock(&obj->oo_guard);
		return 0;
	}

	CDEBUG(D_INODE, DFID" decrease nlink %d\n",
	       PFID(lu_object_fid(&dt->do_lu)), inode->i_nlink);

	osd_ldiskfs_dec_count(oh->ot_handle, inode);
	spin_unlock(&obj->oo_guard);

	osd_dirty_inode(inode, I_DIRTY_DATASYNC);
	LINVRNT(osd_invariant(obj));

	osd_trans_exec_check(env, th, OSD_OT_REF_DEL);

	return 0;
}

/*
 * Concurrency: @dt is read locked.
 */
static int osd_xattr_get(const struct lu_env *env, struct dt_object *dt,
			 struct lu_buf *buf, const char *name)
{
	struct osd_object      *obj    = osd_dt_obj(dt);
	struct inode           *inode  = obj->oo_inode;
	struct osd_thread_info *info   = osd_oti_get(env);
	struct dentry          *dentry = &info->oti_obj_dentry;
	bool cache_xattr = false;
	int rc;

	LASSERT(buf);

	/* version get is not real XATTR but uses xattr API */
	if (strcmp(name, XATTR_NAME_VERSION) == 0) {
		dt_obj_version_t *ver = buf->lb_buf;

		/*
		 * for version we are just using xattr API but change inode
		 * field instead
		 */
		if (buf->lb_len == 0)
			return sizeof(dt_obj_version_t);

		if (buf->lb_len < sizeof(dt_obj_version_t))
			return -ERANGE;

		CDEBUG(D_INODE, "Get version %#llx for inode %lu\n",
		       LDISKFS_I(inode)->i_fs_version, inode->i_ino);

		*ver = LDISKFS_I(inode)->i_fs_version;

		return sizeof(dt_obj_version_t);
	}

	if (!dt_object_exists(dt))
		return -ENOENT;

	LASSERT(!dt_object_remote(dt));
	LASSERT(inode->i_op != NULL);
#ifdef HAVE_IOP_XATTR
	LASSERT(inode->i_op->getxattr != NULL);
#endif

	if (strcmp(name, XATTR_NAME_LOV) == 0 ||
	    strcmp(name, XATTR_NAME_DEFAULT_LMV) == 0)
		cache_xattr = true;

	if (cache_xattr) {
		rc = osd_oxc_get(obj, name, buf);
		if (rc != -ENOENT)
			return rc;
	}

	if (strcmp(name, XATTR_NAME_FID) == 0 && obj->oo_pfid_in_lma) {
		struct lustre_ost_attrs *loa = &info->oti_ost_attrs;
		struct lustre_mdt_attrs *lma = &loa->loa_lma;
		struct filter_fid *ff;
		struct ost_layout *ol;

		rc = osd_get_lma(info, inode, &info->oti_obj_dentry, loa);
		if (rc)
			return rc;

		LASSERT(lma->lma_compat & LMAC_STRIPE_INFO);

		rc = sizeof(*ff);
		if (buf->lb_len == 0 || !buf->lb_buf)
			return rc;

		if (buf->lb_len < rc)
			return -ERANGE;

		ff = buf->lb_buf;
		ol = &ff->ff_layout;
		ol->ol_stripe_count = cpu_to_le32(loa->loa_parent_fid.f_ver >>
						  PFID_STRIPE_IDX_BITS);
		ol->ol_stripe_size = cpu_to_le32(loa->loa_stripe_size);
		loa->loa_parent_fid.f_ver &= PFID_STRIPE_COUNT_MASK;
		fid_cpu_to_le(&ff->ff_parent, &loa->loa_parent_fid);
		if (lma->lma_compat & LMAC_COMP_INFO) {
			ol->ol_comp_start = cpu_to_le64(loa->loa_comp_start);
			ol->ol_comp_end = cpu_to_le64(loa->loa_comp_end);
			ol->ol_comp_id = cpu_to_le32(loa->loa_comp_id);
		} else {
			ol->ol_comp_start = 0;
			ol->ol_comp_end = 0;
			ol->ol_comp_id = 0;
		}
	} else {
		/* Get enc context xattr directly from ldiskfs instead of going
		 * through the VFS, as there is no xattr handler for
		 * "encryption.".
		 */
		if (strcmp(name, LL_XATTR_NAME_ENCRYPTION_CONTEXT) == 0)
			rc = ldiskfs_xattr_get(inode,
					  LDISKFS_XATTR_INDEX_ENCRYPTION,
					  LDISKFS_XATTR_NAME_ENCRYPTION_CONTEXT,
					  buf->lb_buf, buf->lb_len);
		else
			rc = __osd_xattr_get(inode, dentry, name,
					     buf->lb_buf, buf->lb_len);
	}

	if (cache_xattr) {
		if (rc == -ENOENT || rc == -ENODATA)
			osd_oxc_add(obj, name, NULL, 0);
		else if (rc > 0 && buf->lb_buf != NULL)
			osd_oxc_add(obj, name, buf->lb_buf, rc);
	}

	return rc;
}

static int osd_declare_xattr_set(const struct lu_env *env,
				 struct dt_object *dt,
				 const struct lu_buf *buf, const char *name,
				 int fl, struct thandle *handle)
{
	struct osd_thandle *oh;
	int credits = 0;
	struct super_block *sb = osd_sb(osd_dev(dt->do_lu.lo_dev));

	LASSERT(handle != NULL);

	oh = container_of(handle, struct osd_thandle, ot_super);
	LASSERT(oh->ot_handle == NULL);

	if (strcmp(name, XATTR_NAME_LMA) == 0) {
		/*
		 * For non-upgrading case, the LMA is set first and
		 * usually fit inode. But for upgrade case, the LMA
		 * may be in another separated EA block.
		 */
		if (dt_object_exists(dt)) {
			if (fl == LU_XATTR_REPLACE)
				credits = 1;
			else
				goto upgrade;
		}
	} else if (strcmp(name, XATTR_NAME_VERSION) == 0) {
		credits = 1;
	} else if (strcmp(name, XATTR_NAME_FID) == 0) {
		/* We may need to delete the old PFID EA. */
		credits = LDISKFS_MAXQUOTAS_DEL_BLOCKS(sb);
		if (fl == LU_XATTR_REPLACE)
			credits += 1;
		else
			goto upgrade;
	} else {
		/*
		 * If some name entry resides on remote MDT, then will create
		 * agent entry under remote parent. On the other hand, if the
		 * remote entry will be removed, then related agent entry may
		 * need to be removed from the remote parent. So there may be
		 * kinds of cases, let's declare enough credits. The credits
		 * for create agent entry is enough for remove case.
		 */
		if (strcmp(name, XATTR_NAME_LINK) == 0) {
			credits += osd_dto_credits_noquota[DTO_INDEX_INSERT];
			if (dt_object_exists(dt))
				credits += 1; /* For updating LMA */
		}

upgrade:
		credits += osd_dto_credits_noquota[DTO_XATTR_SET];

		if (buf != NULL) {
			ssize_t buflen;

			if (buf->lb_buf == NULL && dt_object_exists(dt)) {
				/*
				 * learn xattr size from osd_xattr_get if
				 * attribute has not been read yet
				 */
				buflen = __osd_xattr_get(
				    osd_dt_obj(dt)->oo_inode,
				    &osd_oti_get(env)->oti_obj_dentry,
				    name, NULL, 0);
				if (buflen < 0)
					buflen = 0;
			} else {
				buflen = buf->lb_len;
			}

			if (buflen > sb->s_blocksize) {
				credits += osd_calc_bkmap_credits(
				    sb, NULL, 0, -1,
				    (buflen + sb->s_blocksize - 1) >>
				    sb->s_blocksize_bits);
			}
		}
		/*
		 * xattr set may involve inode quota change, reserve credits for
		 * dquot_initialize()
		 */
		credits += LDISKFS_MAXQUOTAS_INIT_BLOCKS(sb);
	}

	osd_trans_declare_op(env, oh, OSD_OT_XATTR_SET, credits);

	return 0;
}

static int osd_xattr_set_pfid(const struct lu_env *env, struct osd_object *obj,
			      const struct lu_buf *buf, int fl,
			      struct thandle *handle)
{
	struct osd_thread_info *info = osd_oti_get(env);
	struct dentry *dentry = &info->oti_obj_dentry;
	struct lustre_ost_attrs *loa = &info->oti_ost_attrs;
	struct lustre_mdt_attrs *lma = &loa->loa_lma;
	struct inode *inode = obj->oo_inode;
	struct filter_fid *ff = buf->lb_buf;
	struct ost_layout *ol = &ff->ff_layout;
	int flags = XATTR_REPLACE;
	int rc;

	ENTRY;

	if (buf->lb_len != sizeof(*ff) && buf->lb_len != sizeof(struct lu_fid))
		RETURN(-EINVAL);

	rc = osd_get_lma(info, inode, dentry, loa);
	if (rc == -ENODATA) {
		/* Usually for upgarding from old device */
		lustre_loa_init(loa, lu_object_fid(&obj->oo_dt.do_lu),
				LMAC_FID_ON_OST, 0);
		flags = XATTR_CREATE;
	} else if (rc) {
		RETURN(rc);
	}

	if (!rc && lma->lma_compat & LMAC_STRIPE_INFO) {
		if ((fl & LU_XATTR_CREATE) && !(fl & LU_XATTR_REPLACE))
			RETURN(-EEXIST);

		if (LDISKFS_INODE_SIZE(inode->i_sb) > 256) {
			/* Separate PFID EA from LMA */
			lma->lma_compat &= ~(LMAC_STRIPE_INFO | LMAC_COMP_INFO);
			lustre_lma_swab(lma);
			rc = __osd_xattr_set(info, inode, XATTR_NAME_LMA, lma,
					     sizeof(*lma), XATTR_REPLACE);
			if (!rc) {
				obj->oo_pfid_in_lma = 0;
				rc = LU_XATTR_CREATE;
			}

			RETURN(rc);
		}
	} else {
		if (LDISKFS_INODE_SIZE(inode->i_sb) > 256)
			RETURN(fl);

		/*
		 * Old client does not send stripe information,
		 * then store the PFID EA on disk separatedly.
		 */
		if (unlikely(buf->lb_len == sizeof(struct lu_fid) ||
			     ol->ol_stripe_size == 0))
			RETURN(fl);

		/* Remove old PFID EA entry firstly. */
		dquot_initialize(inode);
		rc = ll_vfs_removexattr(dentry, inode, XATTR_NAME_FID);
		if (rc == -ENODATA) {
			/* XATTR_NAME_FID is already absent */
			rc = 0;
		} else if (rc) {
			RETURN(rc);
		}
	}

	fid_le_to_cpu(&loa->loa_parent_fid, &ff->ff_parent);
	if (likely(ol->ol_stripe_size != 0)) {
		loa->loa_parent_fid.f_ver |= le32_to_cpu(ol->ol_stripe_count) <<
					     PFID_STRIPE_IDX_BITS;
		loa->loa_stripe_size = le32_to_cpu(ol->ol_stripe_size);
		lma->lma_compat |= LMAC_STRIPE_INFO;
		if (ol->ol_comp_id != 0) {
			loa->loa_comp_id = le32_to_cpu(ol->ol_comp_id);
			loa->loa_comp_start = le64_to_cpu(ol->ol_comp_start);
			loa->loa_comp_end = le64_to_cpu(ol->ol_comp_end);
			lma->lma_compat |= LMAC_COMP_INFO;
		}
	}

	lustre_loa_swab(loa, false);

	/* Store the PFID EA inside LMA. */
	rc = __osd_xattr_set(info, inode, XATTR_NAME_LMA, loa, sizeof(*loa),
			     flags);
	if (!rc)
		obj->oo_pfid_in_lma = 1;

	RETURN(rc);
}

/*
 * In DNE environment, the object (in spite of regular file or directory)
 * and its name entry may reside on different MDTs. Under such case, we will
 * create an agent entry on the MDT where the object resides. The agent entry
 * references the object locally, that makes the object to be visible to the
 * userspace when mounted as 'ldiskfs' directly. Then the userspace tools,
 * such as 'tar' can handle the object properly.
 *
 * We handle the agent entry during set linkEA that is the common interface
 * for both regular file and directroy, can handle kinds of cases, such as
 * create/link/unlink/rename, and so on.
 *
 * NOTE: we can NOT do that when ea_{insert,delete} that is only for directory.
 *
 * XXX: There are two known issues:
 * 1. For one object, we will create at most one agent entry even if there
 *    may be more than one cross-MDTs hard links on the object. So the local
 *    e2fsck may claim that the object's nlink is larger than the name entries
 *    that reference such inode. And in further, the e2fsck will fix the nlink
 *    attribute to match the local references. Then it will cause the object's
 *    nlink attribute to be inconsistent with the global references. it is bad
 *    but not fatal. The ref_del() can handle the zero-referenced case. On the
 *    other hand, the global namespace LFSCK can repair the object's attribute
 *    according to the linkEA.
 * 2. There may be too many hard links on the object as to its linkEA overflow,
 *    then the linkEA entry for cross-MDTs reference may be discarded. If such
 *    case happened, then at this point, we do not know whether there are some
 *    cross-MDTs reference. But there are local references, it guarantees that
 *    object is visible to userspace when mounted as 'ldiskfs'. That is enough.
 */
static int osd_xattr_handle_linkea(const struct lu_env *env,
				   struct osd_device *osd,
				   struct osd_object *obj,
				   const struct lu_buf *buf,
				   struct thandle *handle)
{
	const struct lu_fid *fid = lu_object_fid(&obj->oo_dt.do_lu);
	struct lu_fid *tfid = &osd_oti_get(env)->oti_fid3;
	struct linkea_data ldata = { .ld_buf = (struct lu_buf *)buf };
	struct lu_name tmpname;
	struct osd_thandle *oh;
	int rc;
	bool remote = false;

	ENTRY;

	oh = container_of(handle, struct osd_thandle, ot_super);
	LASSERT(oh->ot_handle != NULL);

	rc = linkea_init_with_rec(&ldata);
	if (!rc) {
		linkea_first_entry(&ldata);
		while (ldata.ld_lee != NULL && !remote) {
			linkea_entry_unpack(ldata.ld_lee, &ldata.ld_reclen,
					    &tmpname, tfid);
			if (osd_remote_fid(env, osd, tfid) > 0)
				remote = true;
			else
				linkea_next_entry(&ldata);
		}
	} else if (rc == -ENODATA) {
		rc = 0;
	} else {
		RETURN(rc);
	}

	if (lu_object_has_agent_entry(&obj->oo_dt.do_lu) && !remote) {
		rc = osd_delete_from_remote_parent(env, osd, obj, oh, false);
		if (rc)
			CERROR("%s: failed to remove agent entry for "DFID
			       ": rc = %d\n", osd_name(osd), PFID(fid), rc);
	} else if (!lu_object_has_agent_entry(&obj->oo_dt.do_lu) && remote) {
		rc = osd_add_to_remote_parent(env, osd, obj, oh);
		if (rc)
			CERROR("%s: failed to create agent entry for "DFID
			       ": rc = %d\n", osd_name(osd), PFID(fid), rc);
	}

	RETURN(rc);
}

/*
 * Concurrency: @dt is write locked.
 */
static int osd_xattr_set(const struct lu_env *env, struct dt_object *dt,
			 const struct lu_buf *buf, const char *name, int fl,
			 struct thandle *handle)
{
	struct osd_object *obj = osd_dt_obj(dt);
	struct osd_device *osd = osd_obj2dev(obj);
	struct inode *inode = obj->oo_inode;
	struct osd_thread_info *info = osd_oti_get(env);
	int fs_flags = 0;
	int len;
	int rc;

	ENTRY;

	LASSERT(handle);
	LASSERT(buf);

	/* version set is not real XATTR */
	if (strcmp(name, XATTR_NAME_VERSION) == 0) {
		dt_obj_version_t *version = buf->lb_buf;

		/*
		 * for version we are just using xattr API but change inode
		 * field instead
		 */
		LASSERT(buf->lb_len == sizeof(dt_obj_version_t));

		CDEBUG(D_INODE, "Set version %#llx (old %#llx) for inode %lu\n",
		       *version, LDISKFS_I(inode)->i_fs_version, inode->i_ino);

		LDISKFS_I(inode)->i_fs_version = *version;
		/*
		 * Version is set after all inode operations are finished,
		 * so we should mark it dirty here
		 */
		osd_dirty_inode(inode, I_DIRTY_DATASYNC);

		RETURN(0);
	}

	CDEBUG(D_INODE, DFID" set xattr '%s' with size %zu\n",
	       PFID(lu_object_fid(&dt->do_lu)), name, buf->lb_len);

	len = buf->lb_len;
	osd_trans_exec_op(env, handle, OSD_OT_XATTR_SET);

	/*
	 * For the OST device with 256 bytes inode size by default,
	 * the PFID EA will be stored together with LMA EA to avoid
	 * performance trouble. Otherwise the PFID EA can be stored
	 * independently. LU-8998
	 */
	if (strcmp(name, XATTR_NAME_FID) == 0 && osd->od_is_ost &&
	    (LDISKFS_INODE_SIZE(inode->i_sb) <= 256 || obj->oo_pfid_in_lma)) {
		LASSERT(buf->lb_buf);

		fl = osd_xattr_set_pfid(env, obj, buf, fl, handle);
		if (fl <= 0)
			RETURN(fl);
	} else if (strcmp(name, XATTR_NAME_LMV) == 0) {
		struct lustre_ost_attrs *loa = &info->oti_ost_attrs;
		struct lustre_mdt_attrs *lma = &loa->loa_lma;

		rc = osd_get_lma(info, inode, &info->oti_obj_dentry, loa);
		if (rc)
			RETURN(rc);

		lma->lma_incompat |= LMAI_STRIPED;
		lustre_lma_swab(lma);
		rc = __osd_xattr_set(info, inode, XATTR_NAME_LMA, lma,
				     sizeof(*lma), XATTR_REPLACE);
		if (rc != 0)
			RETURN(rc);
	} else if (strcmp(name, XATTR_NAME_LINK) == 0) {
		LASSERT(!osd->od_is_ost);

		rc = osd_xattr_handle_linkea(env, osd, obj, buf, handle);
		if (rc)
			RETURN(rc);
	}

	if (fl & LU_XATTR_REPLACE)
		fs_flags |= XATTR_REPLACE;

	if (fl & LU_XATTR_CREATE)
		fs_flags |= XATTR_CREATE;

	if (strcmp(name, LL_XATTR_NAME_ENCRYPTION_CONTEXT) == 0) {
		/* Set enc context xattr directly in ldiskfs instead of going
		 * through the VFS, as there is no xattr handler for
		 * "encryption.".
		 */
		struct osd_thandle *oth = container_of(handle,
						       struct osd_thandle,
						       ot_super);

		if (!oth->ot_handle)
			/* this should be already part of a transaction */
			RETURN(-EPROTO);

		rc = ldiskfs_xattr_set_handle(oth->ot_handle, inode,
					  LDISKFS_XATTR_INDEX_ENCRYPTION,
					  LDISKFS_XATTR_NAME_ENCRYPTION_CONTEXT,
					  buf->lb_buf, len, fs_flags);
	} else {
		rc = __osd_xattr_set(info, inode, name,
				     buf->lb_buf, len, fs_flags);
	}
	osd_trans_exec_check(env, handle, OSD_OT_XATTR_SET);

	if (rc == 0 &&
	    (strcmp(name, XATTR_NAME_LOV) == 0 ||
	     strcmp(name, XATTR_NAME_DEFAULT_LMV) == 0))
		osd_oxc_add(obj, name, buf->lb_buf, buf->lb_len);

	return rc;
}

/*
 * Concurrency: @dt is read locked.
 */
static int osd_xattr_list(const struct lu_env *env, struct dt_object *dt,
			  const struct lu_buf *buf)
{
	struct osd_object *obj = osd_dt_obj(dt);
	struct osd_device *dev = osd_obj2dev(obj);
	struct inode *inode = obj->oo_inode;
	struct osd_thread_info *info = osd_oti_get(env);
	struct dentry *dentry = &info->oti_obj_dentry;
	int rc;

	if (!dt_object_exists(dt))
		return -ENOENT;

	LASSERT(!dt_object_remote(dt));
	LASSERT(inode->i_op != NULL);
	LASSERT(inode->i_op->listxattr != NULL);

	dentry->d_inode = inode;
	dentry->d_sb = inode->i_sb;
	rc = inode->i_op->listxattr(dentry, buf->lb_buf, buf->lb_len);

	if (rc < 0 || buf->lb_buf == NULL)
		return rc;

	/* Hide virtual project ID xattr from list if disabled */
	if (!dev->od_enable_projid_xattr) {
		char *end = (char *)buf->lb_buf + rc;
		char *p = buf->lb_buf;

		while (p < end) {
			char *next = p + strlen(p) + 1;

			if (strcmp(p, XATTR_NAME_PROJID) == 0) {
				if (end - next > 0)
					memmove(p, next, end - next);
				rc -= next - p;
				break;
			}

			p = next;
		}
	}

	return rc;
}

static int osd_declare_xattr_del(const struct lu_env *env,
				 struct dt_object *dt, const char *name,
				 struct thandle *handle)
{
	struct osd_thandle *oh;
	struct super_block *sb = osd_sb(osd_dev(dt->do_lu.lo_dev));

	LASSERT(!dt_object_remote(dt));
	LASSERT(handle != NULL);

	oh = container_of(handle, struct osd_thandle, ot_super);
	LASSERT(oh->ot_handle == NULL);

	osd_trans_declare_op(env, oh, OSD_OT_XATTR_SET,
			     osd_dto_credits_noquota[DTO_XATTR_SET]);
	/*
	 * xattr del may involve inode quota change, reserve credits for
	 * dquot_initialize()
	 */
	oh->ot_credits += LDISKFS_MAXQUOTAS_INIT_BLOCKS(sb);

	return 0;
}

/*
 * Concurrency: @dt is write locked.
 */
static int osd_xattr_del(const struct lu_env *env, struct dt_object *dt,
			 const char *name, struct thandle *handle)
{
	struct osd_object *obj = osd_dt_obj(dt);
	struct inode *inode = obj->oo_inode;
	struct osd_thread_info *info = osd_oti_get(env);
	struct dentry *dentry = &info->oti_obj_dentry;
	int rc;

	if (!dt_object_exists(dt))
		return -ENOENT;

	LASSERT(!dt_object_remote(dt));
	LASSERT(inode->i_op != NULL);
	LASSERT(handle != NULL);
#ifdef HAVE_IOP_XATTR
	LASSERT(inode->i_op->removexattr != NULL);
#endif

	osd_trans_exec_op(env, handle, OSD_OT_XATTR_SET);

	if (strcmp(name, XATTR_NAME_FID) == 0 && obj->oo_pfid_in_lma) {
		struct lustre_mdt_attrs *lma = &info->oti_ost_attrs.loa_lma;

		rc = osd_get_lma(info, inode, &info->oti_obj_dentry,
				 &info->oti_ost_attrs);
		if (!rc) {
			LASSERT(lma->lma_compat & LMAC_STRIPE_INFO);

			lma->lma_compat &= ~(LMAC_STRIPE_INFO | LMAC_COMP_INFO);
			lustre_lma_swab(lma);
			rc = __osd_xattr_set(info, inode, XATTR_NAME_LMA, lma,
					     sizeof(*lma), XATTR_REPLACE);
			if (!rc)
				obj->oo_pfid_in_lma = 0;
		}
	} else {
		dquot_initialize(inode);
		dentry->d_inode = inode;
		dentry->d_sb = inode->i_sb;
		rc = ll_vfs_removexattr(dentry, inode, name);
	}

	osd_trans_exec_check(env, handle, OSD_OT_XATTR_SET);

	if (rc == 0 &&
	    (strcmp(name, XATTR_NAME_LOV) == 0 ||
	     strcmp(name, XATTR_NAME_DEFAULT_LMV) == 0))
		osd_oxc_del(obj, name);

	return rc;
}

static int osd_object_sync(const struct lu_env *env, struct dt_object *dt,
			   __u64 start, __u64 end)
{
	struct osd_object *obj = osd_dt_obj(dt);
	struct osd_device *dev = osd_obj2dev(obj);
	struct inode *inode = obj->oo_inode;
	struct file *file;
	int rc;

	ENTRY;
	file = alloc_file_pseudo(inode, dev->od_mnt, "/", O_NOATIME,
				 inode->i_fop);
	if (IS_ERR(file))
		RETURN(PTR_ERR(file));

	file->f_mode |= FMODE_64BITHASH;
	rc = vfs_fsync_range(file, start, end, 0);
	ihold(inode);
	fput(file);

	RETURN(rc);
}

static int osd_invalidate(const struct lu_env *env, struct dt_object *dt)
{
	return 0;
}

static bool osd_check_stale(struct dt_object *dt)
{
	return false;
}
/*
 * Index operations.
 */

static int osd_iam_index_probe(const struct lu_env *env, struct osd_object *o,
			       const struct dt_index_features *feat)
{
	struct iam_descr *descr;

	if (osd_object_is_root(o))
		return feat == &dt_directory_features;

	LASSERT(o->oo_dir != NULL);

	descr = o->oo_dir->od_container.ic_descr;
	if (feat == &dt_directory_features) {
		if (descr->id_rec_size == sizeof(struct osd_fid_pack))
			return 1;
		else
			return 0;
	} else {
		return feat->dif_keysize_min <= descr->id_key_size &&
		       descr->id_key_size <= feat->dif_keysize_max &&
		       feat->dif_recsize_min <= descr->id_rec_size &&
		       descr->id_rec_size <= feat->dif_recsize_max &&
		       !(feat->dif_flags & (DT_IND_VARKEY |
					    DT_IND_VARREC | DT_IND_NONUNQ)) &&
		       ergo(feat->dif_flags & DT_IND_UPDATE,
			    1 /* XXX check that object (and fs) is writable */);
	}
}

static int osd_iam_container_init(const struct lu_env *env,
				  struct osd_object *obj,
				  struct osd_directory *dir)
{
	struct iam_container *bag = &dir->od_container;
	int result;

	result = iam_container_init(bag, &dir->od_descr, obj->oo_inode);
	if (result != 0)
		return result;

	result = iam_container_setup(bag);
	if (result == 0)
		obj->oo_dt.do_index_ops = &osd_index_iam_ops;
	else
		iam_container_fini(bag);

	return result;
}


/*
 * Concurrency: no external locking is necessary.
 */
static int osd_index_try(const struct lu_env *env, struct dt_object *dt,
			 const struct dt_index_features *feat)
{
	int result;
	int skip_iam = 0;
	struct osd_object *obj = osd_dt_obj(dt);

	LINVRNT(osd_invariant(obj));

	if (osd_object_is_root(obj)) {
		dt->do_index_ops = &osd_index_ea_ops;
		result = 0;
	} else if (feat == &dt_directory_features) {
		dt->do_index_ops = &osd_index_ea_ops;
		if (obj->oo_inode == NULL || S_ISDIR(obj->oo_inode->i_mode))
			result = 0;
		else
			result = -ENOTDIR;
		skip_iam = 1;
	} else if (unlikely(feat == &dt_otable_features)) {
		dt->do_index_ops = &osd_otable_ops;
		return 0;
	} else if (unlikely(feat == &dt_acct_features)) {
		dt->do_index_ops = &osd_acct_index_ops;
		result = 0;
		skip_iam = 1;
	} else if (!osd_has_index(obj)) {
		struct osd_directory *dir;
		struct osd_device *osd = osd_obj2dev(obj);
		const struct lu_fid *fid = lu_object_fid(&dt->do_lu);

		OBD_ALLOC_PTR(dir);
		if (dir) {

			spin_lock(&obj->oo_guard);
			if (obj->oo_dir == NULL)
				obj->oo_dir = dir;
			else
				/*
				 * Concurrent thread allocated container data.
				 */
				OBD_FREE_PTR(dir);
			spin_unlock(&obj->oo_guard);
			/*
			 * Now, that we have container data, serialize its
			 * initialization.
			 */
			down_write(&obj->oo_ext_idx_sem);
			/*
			 * recheck under lock.
			 */

			if (osd_has_index(obj)) {
				result = 0;
				goto unlock;
			}

			result = osd_iam_container_init(env, obj, obj->oo_dir);
			if (result || feat == &dt_lfsck_namespace_features ||
			    feat == &dt_lfsck_layout_orphan_features ||
			    feat == &dt_lfsck_layout_dangling_features)
				goto unlock;

			result = osd_index_register(osd, fid,
						    feat->dif_keysize_max,
						    feat->dif_recsize_max);
			if (result < 0)
				CWARN("%s: failed to register index "
				      DFID": rc = %d\n",
				      osd_name(osd), PFID(fid), result);
			else if (result > 0)
				result = 0;
			else
				CDEBUG(D_LFSCK, "%s: index object "DFID
				       " (%d/%d) registered\n",
				       osd_name(osd), PFID(fid),
				       (int)feat->dif_keysize_max,
				       (int)feat->dif_recsize_max);

unlock:
			up_write(&obj->oo_ext_idx_sem);
		} else {
			result = -ENOMEM;
		}
	} else {
		result = 0;
	}

	if (result == 0 && skip_iam == 0) {
		if (!osd_iam_index_probe(env, obj, feat))
			result = -ENOTDIR;
	}
	LINVRNT(osd_invariant(obj));

	return result;
}

static int osd_otable_it_attr_get(const struct lu_env *env,
				 struct dt_object *dt,
				 struct lu_attr *attr)
{
	attr->la_valid = 0;
	return 0;
}

static const struct dt_object_operations osd_obj_ops = {
	.do_read_lock		= osd_read_lock,
	.do_write_lock		= osd_write_lock,
	.do_read_unlock		= osd_read_unlock,
	.do_write_unlock	= osd_write_unlock,
	.do_write_locked	= osd_write_locked,
	.do_attr_get		= osd_attr_get,
	.do_declare_attr_set	= osd_declare_attr_set,
	.do_attr_set		= osd_attr_set,
	.do_ah_init		= osd_ah_init,
	.do_declare_create	= osd_declare_create,
	.do_create		= osd_create,
	.do_declare_destroy	= osd_declare_destroy,
	.do_destroy		= osd_destroy,
	.do_index_try		= osd_index_try,
	.do_declare_ref_add	= osd_declare_ref_add,
	.do_ref_add		= osd_ref_add,
	.do_declare_ref_del	= osd_declare_ref_del,
	.do_ref_del		= osd_ref_del,
	.do_xattr_get		= osd_xattr_get,
	.do_declare_xattr_set	= osd_declare_xattr_set,
	.do_xattr_set		= osd_xattr_set,
	.do_declare_xattr_del	= osd_declare_xattr_del,
	.do_xattr_del		= osd_xattr_del,
	.do_xattr_list		= osd_xattr_list,
	.do_object_sync		= osd_object_sync,
	.do_invalidate		= osd_invalidate,
	.do_check_stale		= osd_check_stale,
};

static const struct dt_object_operations osd_obj_otable_it_ops = {
	.do_attr_get	= osd_otable_it_attr_get,
	.do_index_try	= osd_index_try,
};

static int osd_index_declare_iam_delete(const struct lu_env *env,
					struct dt_object *dt,
					const struct dt_key *key,
					struct thandle *handle)
{
	struct osd_thandle *oh;

	oh = container_of(handle, struct osd_thandle, ot_super);
	LASSERT(oh->ot_handle == NULL);

	/* Recycle  may cause additional three blocks to be changed. */
	osd_trans_declare_op(env, oh, OSD_OT_DELETE,
			     osd_dto_credits_noquota[DTO_INDEX_DELETE] + 3);

	return 0;
}

/**
 *      delete a (key, value) pair from index \a dt specified by \a key
 *
 *      \param  dt      osd index object
 *      \param  key     key for index
 *      \param  rec     record reference
 *      \param  handle  transaction handler
 *
 *      \retval  0  success
 *      \retval -ve   failure
 */
static int osd_index_iam_delete(const struct lu_env *env, struct dt_object *dt,
				const struct dt_key *key,
				struct thandle *handle)
{
	struct osd_thread_info *oti = osd_oti_get(env);
	struct osd_object *obj = osd_dt_obj(dt);
	struct osd_thandle *oh;
	struct iam_path_descr *ipd;
	struct iam_container *bag = &obj->oo_dir->od_container;
	int rc;

	ENTRY;

	if (!dt_object_exists(dt))
		RETURN(-ENOENT);

	LINVRNT(osd_invariant(obj));
	LASSERT(!dt_object_remote(dt));
	LASSERT(bag->ic_object == obj->oo_inode);
	LASSERT(handle != NULL);

	osd_trans_exec_op(env, handle, OSD_OT_DELETE);

	ipd = osd_idx_ipd_get(env, bag);
	if (unlikely(ipd == NULL))
		RETURN(-ENOMEM);

	oh = container_of(handle, struct osd_thandle, ot_super);
	LASSERT(oh->ot_handle != NULL);
	LASSERT(oh->ot_handle->h_transaction != NULL);

	if (fid_is_quota(lu_object_fid(&dt->do_lu))) {
		/* swab quota uid/gid provided by caller */
		oti->oti_quota_id = cpu_to_le64(*((__u64 *)key));
		key = (const struct dt_key *)&oti->oti_quota_id;
	}

	rc = iam_delete(oh->ot_handle, bag, (const struct iam_key *)key, ipd);
	osd_ipd_put(env, bag, ipd);
	LINVRNT(osd_invariant(obj));
	osd_trans_exec_check(env, handle, OSD_OT_DELETE);
	RETURN(rc);
}

static int osd_index_declare_ea_delete(const struct lu_env *env,
				       struct dt_object *dt,
				       const struct dt_key *key,
				       struct thandle *handle)
{
	struct osd_thandle *oh;
	struct inode *inode;
	int rc, credits;

	ENTRY;

	LASSERT(!dt_object_remote(dt));
	LASSERT(handle != NULL);

	oh = container_of(handle, struct osd_thandle, ot_super);
	LASSERT(oh->ot_handle == NULL);

	credits = osd_dto_credits_noquota[DTO_INDEX_DELETE];
	osd_trans_declare_op(env, oh, OSD_OT_DELETE, credits);

	inode = osd_dt_obj(dt)->oo_inode;
	if (inode == NULL)
		RETURN(-ENOENT);

	rc = osd_declare_inode_qid(env, i_uid_read(inode), i_gid_read(inode),
				   i_projid_read(inode), 0, oh, osd_dt_obj(dt),
				   NULL, OSD_QID_BLK);
	RETURN(rc);
}

static inline int osd_get_fid_from_dentry(struct ldiskfs_dir_entry_2 *de,
					  struct dt_rec *fid)
{
	struct osd_fid_pack *rec;
	int rc = -ENODATA;

	if (de->file_type & LDISKFS_DIRENT_LUFID) {
		rec = (struct osd_fid_pack *)(de->name + de->name_len + 1);
		rc = osd_fid_unpack((struct lu_fid *)fid, rec);
		if (rc == 0 && unlikely(!fid_is_sane((struct lu_fid *)fid)))
			rc = -EINVAL;
	}
	return rc;
}

static int osd_remote_fid(const struct lu_env *env, struct osd_device *osd,
			  const struct lu_fid *fid)
{
	struct seq_server_site *ss = osd_seq_site(osd);

	ENTRY;

	/* FID seqs not in FLDB, must be local seq */
	if (unlikely(!fid_seq_in_fldb(fid_seq(fid))))
		RETURN(0);

	/*
	 * If FLD is not being initialized yet, it only happens during the
	 * initialization, likely during mgs initialization, and we assume
	 * this is local FID.
	 */
	if (ss == NULL || ss->ss_server_fld == NULL)
		RETURN(0);

	/* Only check the local FLDB here */
	if (osd_seq_exists(env, osd, fid_seq(fid)))
		RETURN(0);

	RETURN(1);
}

static void osd_take_care_of_agent(const struct lu_env *env,
				   struct osd_device *osd,
				   struct osd_thandle *oh,
				   struct ldiskfs_dir_entry_2 *de)
{
	struct lu_fid *fid = &osd_oti_get(env)->oti_fid;
	struct osd_idmap_cache *idc;
	int rc, schedule = 0;

	LASSERT(de != NULL);

	rc = osd_get_fid_from_dentry(de, (struct dt_rec *)fid);
	if (likely(rc == 0)) {
		idc = osd_idc_find_or_init(env, osd, fid);
		if (IS_ERR(idc) || idc->oic_remote)
			schedule = 1;
	} else if (rc == -ENODATA) {
		/*
		 * can't get FID, postpone to the end of the
		 * transaction when iget() is safe
		 */
		schedule = 1;
	} else {
		CERROR("%s: can't get FID: rc = %d\n", osd_name(osd), rc);
	}
	if (schedule)
		osd_schedule_agent_inode_removal(env, oh,
						 le32_to_cpu(de->inode));
}

/**
 * Utility function to get real name from object name
 *
 * \param[in] obj      pointer to the object to be handled
 * \param[in] name     object name
 * \param[in] len      object name len
 * \param[out]ln       pointer to the struct lu_name to hold the real name
 *
 * If file is not encrypted, real name is just the object name.
 * If file is encrypted, object name needs to be decoded. In
 * this case a new buffer is allocated, and ln->ln_name needs to be freed by
 * the caller.
 *
 * \retval   0, on success
 * \retval -ve, on error
 */
static int obj_name2lu_name(struct osd_object *obj, const char *name,
			    int len, struct lu_name *ln)
{
	if (!(obj->oo_lma_flags & LUSTRE_ENCRYPT_FL)) {
		ln->ln_name = name;
		ln->ln_namelen = len;
	} else {
		char *buf = kmalloc(len, GFP_NOFS);

		if (!buf)
			return -ENOMEM;

		len = critical_decode(name, len, buf);
		ln->ln_name = buf;
		ln->ln_namelen = len;
	}

	return 0;
}

/**
 * Index delete function for interoperability mode (b11826).
 * It will remove the directory entry added by osd_index_ea_insert().
 * This entry is needed to maintain name->fid mapping.
 *
 * \param key,  key i.e. file entry to be deleted
 *
 * \retval   0, on success
 * \retval -ve, on error
 */
static int osd_index_ea_delete(const struct lu_env *env, struct dt_object *dt,
			       const struct dt_key *key, struct thandle *handle)
{
	struct osd_object *obj = osd_dt_obj(dt);
	struct inode *dir = obj->oo_inode;
	struct dentry *dentry;
	struct osd_thandle *oh;
	struct ldiskfs_dir_entry_2 *de = NULL;
	struct buffer_head *bh;
	struct htree_lock *hlock = NULL;
	struct osd_device *osd = osd_dev(dt->do_lu.lo_dev);
	struct lu_name ln;
	int rc;

	ENTRY;

	if (!dt_object_exists(dt))
		RETURN(-ENOENT);

	LINVRNT(osd_invariant(obj));
	LASSERT(!dt_object_remote(dt));
	LASSERT(handle != NULL);

	rc = obj_name2lu_name(obj, (char *)key, strlen((char *)key), &ln);
	if (rc)
		RETURN(rc);

	osd_trans_exec_op(env, handle, OSD_OT_DELETE);

	oh = container_of(handle, struct osd_thandle, ot_super);
	LASSERT(oh->ot_handle != NULL);
	LASSERT(oh->ot_handle->h_transaction != NULL);

	dquot_initialize(dir);
	dentry = osd_child_dentry_get(env, obj, ln.ln_name, ln.ln_namelen);

	if (obj->oo_hl_head != NULL) {
		hlock = osd_oti_get(env)->oti_hlock;
		ldiskfs_htree_lock(hlock, obj->oo_hl_head,
				   dir, LDISKFS_HLOCK_DEL);
	} else {
		down_write(&obj->oo_ext_idx_sem);
	}

	bh = osd_ldiskfs_find_entry(dir, &dentry->d_name, &de, NULL, hlock);
	if (!IS_ERR(bh)) {
		/*
		 * If this is not the ".." entry, it might be a remote DNE
		 * entry and  we need to check if the FID is for a remote
		 * MDT.  If the FID is  not in the directory entry (e.g.
		 * upgraded 1.8 filesystem without dirdata enabled) then
		 * we need to get the FID from the LMA. For a remote directory
		 * there HAS to be an LMA, it cannot be an IGIF inode in this
		 * case.
		 *
		 * Delete the entry before the agent inode in order to
		 * simplify error handling.  At worst an error after deleting
		 * the entry first might leak the agent inode afterward. The
		 * reverse would need filesystem abort in case of error deleting
		 * the entry after the agent had been removed, or leave a
		 * dangling entry pointing at a random inode.
		 */
		if (strcmp((char *)key, dotdot) != 0)
			osd_take_care_of_agent(env, osd, oh, de);
		rc = ldiskfs_delete_entry(oh->ot_handle, dir, de, bh);
		brelse(bh);
	} else {
		rc = PTR_ERR(bh);
	}

	if (!rc && fid_is_namespace_visible(lu_object_fid(&dt->do_lu)) &&
	    obj->oo_dirent_count != LU_DIRENT_COUNT_UNSET) {
		/* NB, dirent count may not be accurate, because it's counted
		 * without lock.
		 */
		if (obj->oo_dirent_count)
			obj->oo_dirent_count--;
		else
			obj->oo_dirent_count = LU_DIRENT_COUNT_UNSET;
	}
	if (hlock != NULL)
		ldiskfs_htree_unlock(hlock);
	else
		up_write(&obj->oo_ext_idx_sem);
	GOTO(out, rc);
out:
	LASSERT(osd_invariant(obj));
	osd_trans_exec_check(env, handle, OSD_OT_DELETE);
	if (ln.ln_name != (char *)key)
		kfree(ln.ln_name);
	RETURN(rc);
}

/**
 *      Lookup index for \a key and copy record to \a rec.
 *
 *      \param  dt      osd index object
 *      \param  key     key for index
 *      \param  rec     record reference
 *
 *      \retval  +ve  success : exact mach
 *      \retval  0    return record with key not greater than \a key
 *      \retval -ve   failure
 */
static int osd_index_iam_lookup(const struct lu_env *env, struct dt_object *dt,
				struct dt_rec *rec, const struct dt_key *key)
{
	struct osd_object *obj = osd_dt_obj(dt);
	struct iam_path_descr *ipd;
	struct iam_container *bag = &obj->oo_dir->od_container;
	struct osd_thread_info *oti = osd_oti_get(env);
	struct iam_iterator *it = &oti->oti_idx_it;
	struct iam_rec *iam_rec;
	int rc;

	ENTRY;

	if (!dt_object_exists(dt))
		RETURN(-ENOENT);

	LASSERT(osd_invariant(obj));
	LASSERT(!dt_object_remote(dt));
	LASSERT(bag->ic_object == obj->oo_inode);

	ipd = osd_idx_ipd_get(env, bag);
	if (IS_ERR(ipd))
		RETURN(-ENOMEM);

	/* got ipd now we can start iterator. */
	iam_it_init(it, bag, 0, ipd);

	if (fid_is_quota(lu_object_fid(&dt->do_lu))) {
		/* swab quota uid/gid provided by caller */
		oti->oti_quota_id = cpu_to_le64(*((__u64 *)key));
		key = (const struct dt_key *)&oti->oti_quota_id;
	}

	rc = iam_it_get(it, (struct iam_key *)key);
	if (rc >= 0) {
		if (S_ISDIR(obj->oo_inode->i_mode))
			iam_rec = (struct iam_rec *)oti->oti_ldp;
		else
			iam_rec = (struct iam_rec *)rec;

		iam_reccpy(&it->ii_path.ip_leaf, (struct iam_rec *)iam_rec);

		if (S_ISDIR(obj->oo_inode->i_mode))
			osd_fid_unpack((struct lu_fid *)rec,
				       (struct osd_fid_pack *)iam_rec);
		else if (fid_is_quota(lu_object_fid(&dt->do_lu)))
			osd_quota_unpack(obj, rec);
	}

	iam_it_put(it);
	iam_it_fini(it);
	osd_ipd_put(env, bag, ipd);

	LINVRNT(osd_invariant(obj));

	RETURN(rc);
}

static int osd_index_declare_iam_insert(const struct lu_env *env,
					struct dt_object *dt,
					const struct dt_rec *rec,
					const struct dt_key *key,
					struct thandle *handle)
{
	struct osd_thandle *oh;

	LASSERT(handle != NULL);

	oh = container_of(handle, struct osd_thandle, ot_super);
	LASSERT(oh->ot_handle == NULL);

	osd_trans_declare_op(env, oh, OSD_OT_INSERT,
			     osd_dto_credits_noquota[DTO_INDEX_INSERT]);

	return 0;
}

/**
 *      Inserts (key, value) pair in \a dt index object.
 *
 *      \param  dt      osd index object
 *      \param  key     key for index
 *      \param  rec     record reference
 *      \param  th      transaction handler
 *
 *      \retval  0  success
 *      \retval -ve failure
 */
static int osd_index_iam_insert(const struct lu_env *env, struct dt_object *dt,
				const struct dt_rec *rec,
				const struct dt_key *key, struct thandle *th)
{
	struct osd_object *obj = osd_dt_obj(dt);
	struct iam_path_descr *ipd;
	struct osd_thandle *oh;
	struct iam_container *bag;
	struct osd_thread_info *oti = osd_oti_get(env);
	struct iam_rec *iam_rec;
	int rc;

	ENTRY;

	if (!dt_object_exists(dt))
		RETURN(-ENOENT);

	LINVRNT(osd_invariant(obj));
	LASSERT(!dt_object_remote(dt));

	bag = &obj->oo_dir->od_container;
	LASSERT(bag->ic_object == obj->oo_inode);
	LASSERT(th != NULL);

	osd_trans_exec_op(env, th, OSD_OT_INSERT);

	ipd = osd_idx_ipd_get(env, bag);
	if (unlikely(ipd == NULL))
		RETURN(-ENOMEM);

	oh = container_of(th, struct osd_thandle, ot_super);
	LASSERT(oh->ot_handle != NULL);
	LASSERT(oh->ot_handle->h_transaction != NULL);
	if (S_ISDIR(obj->oo_inode->i_mode)) {
		iam_rec = (struct iam_rec *)oti->oti_ldp;
		osd_fid_pack((struct osd_fid_pack *)iam_rec, rec,
			     &oti->oti_fid);
	} else if (fid_is_quota(lu_object_fid(&dt->do_lu))) {
		/* pack quota uid/gid */
		oti->oti_quota_id = cpu_to_le64(*((__u64 *)key));
		key = (const struct dt_key *)&oti->oti_quota_id;
		/* pack quota record */
		rec = osd_quota_pack(obj, rec, &oti->oti_quota_rec);
		iam_rec = (struct iam_rec *)rec;
	} else {
		iam_rec = (struct iam_rec *)rec;
	}

	rc = iam_insert(oh->ot_handle, bag, (const struct iam_key *)key,
			iam_rec, ipd);
	osd_ipd_put(env, bag, ipd);
	LINVRNT(osd_invariant(obj));
	osd_trans_exec_check(env, th, OSD_OT_INSERT);
	RETURN(rc);
}

/**
 * Calls ldiskfs_add_entry() to add directory entry
 * into the directory. This is required for
 * interoperability mode (b11826)
 *
 * \retval   0, on success
 * \retval -ve, on error
 */
static int __osd_ea_add_rec(struct osd_thread_info *info,
			    struct osd_object *pobj, struct inode  *cinode,
			    const char *name, const struct lu_fid *fid,
			    struct htree_lock *hlock, struct thandle *th)
{
	struct ldiskfs_dentry_param *ldp;
	struct dentry *child;
	struct osd_thandle *oth;
	struct lu_name ln;
	int rc;

	oth = container_of(th, struct osd_thandle, ot_super);
	LASSERT(oth->ot_handle != NULL);
	LASSERT(oth->ot_handle->h_transaction != NULL);
	LASSERT(pobj->oo_inode);

	rc = obj_name2lu_name(pobj, name, strlen(name), &ln);
	if (rc)
		RETURN(rc);

	ldp = (struct ldiskfs_dentry_param *)info->oti_ldp;
	if (unlikely(osd_object_is_root(pobj)))
		ldp->edp_magic = 0;
	else
		osd_get_ldiskfs_dirent_param(ldp, fid);
	child = osd_child_dentry_get(info->oti_env, pobj,
				     ln.ln_name, ln.ln_namelen);
	child->d_fsdata = (void *)ldp;
	dquot_initialize(pobj->oo_inode);
	rc = osd_ldiskfs_add_entry(info, osd_obj2dev(pobj), oth->ot_handle,
				   child, cinode, hlock);
	if (rc == 0 && CFS_FAIL_CHECK(OBD_FAIL_LFSCK_BAD_TYPE)) {
		struct ldiskfs_dir_entry_2	*de;
		struct buffer_head		*bh;
		int				 rc1;

		bh = osd_ldiskfs_find_entry(pobj->oo_inode, &child->d_name, &de,
					    NULL, hlock);
		if (!IS_ERR(bh)) {
			rc1 = osd_ldiskfs_journal_get_write_access(
				oth->ot_handle, pobj->oo_inode->i_sb, bh,
				LDISKFS_JTR_NONE);
			if (rc1 == 0) {
				if (S_ISDIR(cinode->i_mode))
					de->file_type = LDISKFS_DIRENT_LUFID |
							LDISKFS_FT_REG_FILE;
				else
					de->file_type = LDISKFS_DIRENT_LUFID |
							LDISKFS_FT_DIR;
				ldiskfs_handle_dirty_metadata(oth->ot_handle,
							      NULL, bh);
			}
			brelse(bh);
		}
	}

	if (ln.ln_name != name)
		kfree(ln.ln_name);
	RETURN(rc);
}

/**
 * Calls ldiskfs_add_dot_dotdot() to add dot and dotdot entries
 * into the directory.Also sets flags into osd object to
 * indicate dot and dotdot are created. This is required for
 * interoperability mode (b11826)
 *
 * \param dir   directory for dot and dotdot fixup.
 * \param obj   child object for linking
 *
 * \retval   0, on success
 * \retval -ve, on error
 */
static int osd_add_dot_dotdot(struct osd_thread_info *info,
			      struct osd_object *dir,
			      struct inode *parent_dir, const char *name,
			      const struct lu_fid *dot_fid,
			      const struct lu_fid *dot_dot_fid,
			      struct thandle *th)
{
	struct inode *inode = dir->oo_inode;
	struct osd_thandle *oth;
	int result = 0;

	oth = container_of(th, struct osd_thandle, ot_super);
	LASSERT(oth->ot_handle->h_transaction != NULL);
	LASSERT(S_ISDIR(dir->oo_inode->i_mode));

	if (strcmp(name, dot) == 0) {
		if (dir->oo_compat_dot_created) {
			result = -EEXIST;
		} else {
			LASSERT(inode->i_ino == parent_dir->i_ino);
			dir->oo_compat_dot_created = 1;
			result = 0;
		}
	} else if (strcmp(name, dotdot) == 0) {
		if (!dir->oo_compat_dot_created)
			return -EINVAL;
		/* in case of rename, dotdot is already created */
		if (dir->oo_compat_dotdot_created) {
			return __osd_ea_add_rec(info, dir, parent_dir, name,
						dot_dot_fid, NULL, th);
		}

		if (CFS_FAIL_CHECK(OBD_FAIL_LFSCK_BAD_PARENT)) {
			struct lu_fid tfid = *dot_dot_fid;

			tfid.f_oid--;
			result = osd_add_dot_dotdot_internal(info,
					dir->oo_inode, parent_dir, dot_fid,
					&tfid, oth);
		} else {
			result = osd_add_dot_dotdot_internal(info,
					dir->oo_inode, parent_dir, dot_fid,
					dot_dot_fid, oth);
		}

		if (result == 0)
			dir->oo_compat_dotdot_created = 1;
	}

	return result;
}


/**
 * It will call the appropriate osd_add* function and return the
 * value, return by respective functions.
 */
static int osd_ea_add_rec(const struct lu_env *env, struct osd_object *pobj,
			  struct inode *cinode, const char *name,
			  const struct lu_fid *fid, struct thandle *th)
{
	struct osd_thread_info *info = osd_oti_get(env);
	struct htree_lock *hlock;
	int rc;

	hlock = pobj->oo_hl_head != NULL ? info->oti_hlock : NULL;

	if (name[0] == '.' && (name[1] == '\0' ||
			       (name[1] == '.' && name[2] == '\0'))) {
		if (hlock != NULL) {
			ldiskfs_htree_lock(hlock, pobj->oo_hl_head,
					   pobj->oo_inode, 0);
		} else {
			down_write(&pobj->oo_ext_idx_sem);
		}

		rc = osd_add_dot_dotdot(info, pobj, cinode, name,
					lu_object_fid(&pobj->oo_dt.do_lu),
					fid, th);
	} else {
		if (hlock != NULL) {
			ldiskfs_htree_lock(hlock, pobj->oo_hl_head,
					   pobj->oo_inode, LDISKFS_HLOCK_ADD);
		} else {
			down_write(&pobj->oo_ext_idx_sem);
		}

		if (CFS_FAIL_CHECK(OBD_FAIL_FID_INDIR)) {
			struct lu_fid *tfid = &info->oti_fid;

			*tfid = *fid;
			tfid->f_ver = ~0;
			rc = __osd_ea_add_rec(info, pobj, cinode, name,
					      tfid, hlock, th);
		} else {
			rc = __osd_ea_add_rec(info, pobj, cinode, name, fid,
					      hlock, th);
		}
	}
	if (!rc && fid_is_namespace_visible(lu_object_fid(&pobj->oo_dt.do_lu))
	    && pobj->oo_dirent_count != LU_DIRENT_COUNT_UNSET)
		pobj->oo_dirent_count++;

	if (hlock != NULL)
		ldiskfs_htree_unlock(hlock);
	else
		up_write(&pobj->oo_ext_idx_sem);

	return rc;
}

static int
osd_ldiskfs_consistency_check(struct osd_thread_info *oti,
			      struct osd_device *dev,
			      const struct lu_fid *fid,
			      struct osd_inode_id *id)
{
	struct lustre_scrub *scrub = &dev->od_scrub.os_scrub;
	struct inode *inode = NULL;
	int once = 0;
	bool insert;
	int rc;

	ENTRY;
	if (!scrub_needs_check(scrub, fid, id->oii_ino))
		RETURN(0);
again:
	rc = osd_oi_lookup(oti, dev, fid, &oti->oti_id, 0);
	if (rc == -ENOENT) {
		__u32 gen = id->oii_gen;

		insert = true;
		if (inode != NULL)
			goto trigger;

		inode = osd_iget(oti, dev, id);
		/* The inode has been removed (by race maybe). */
		if (IS_ERR(inode)) {
			rc = PTR_ERR(inode);

			RETURN(rc == -ESTALE ? -ENOENT : rc);
		}

		/* The OI mapping is lost. */
		if (gen != OSD_OII_NOGEN)
			goto trigger;

		/*
		 * The inode may has been reused by others, we do not know,
		 * leave it to be handled by subsequent osd_fid_lookup().
		 */
		GOTO(out, rc = 0);
	} else if (rc || osd_id_eq(id, &oti->oti_id)) {
		GOTO(out, rc);
	}

	insert = false;

trigger:
	if (scrub->os_running) {
		if (inode == NULL) {
			inode = osd_iget(oti, dev, id);
			/* The inode has been removed (by race maybe). */
			if (IS_ERR(inode)) {
				rc = PTR_ERR(inode);

				RETURN(rc == -ESTALE ? -ENOENT : rc);
			}
		}

		rc = osd_scrub_oi_insert(dev, fid, id, insert);
		/*
		 * There is race condition between osd_oi_lookup and OI scrub.
		 * The OI scrub finished just after osd_oi_lookup() failure.
		 * Under such case, it is unnecessary to trigger OI scrub again,
		 * but try to call osd_oi_lookup() again.
		 */
		if (unlikely(rc == -EAGAIN))
			goto again;

		if (!S_ISDIR(inode->i_mode))
			rc = 0;
		else
			rc = osd_check_lmv(oti, dev, inode);

		GOTO(out, rc);
	}

	if (dev->od_scrub.os_scrub.os_auto_scrub_interval != AS_NEVER &&
	    ++once == 1) {
		rc = osd_scrub_start(oti->oti_env, dev, SS_AUTO_PARTIAL |
				     SS_CLEAR_DRYRUN | SS_CLEAR_FAILOUT);
		CDEBUG_LIMIT(D_LFSCK | D_CONSOLE | D_WARNING,
			     "%s: trigger partial OI scrub for RPC inconsistency, checking FID "DFID"/%u: rc = %d\n",
			     osd_dev2name(dev), PFID(fid), id->oii_ino, rc);
		if (rc == 0 || rc == -EALREADY)
			goto again;
	}

	GOTO(out, rc);

out:
	iput(inode);

	RETURN(rc);
}

static int osd_fail_fid_lookup(struct osd_thread_info *oti,
			       struct osd_device *dev,
			       struct lu_fid *fid, __u32 ino)
{
	struct lustre_ost_attrs *loa = &oti->oti_ost_attrs;
	struct osd_idmap_cache *oic = &oti->oti_cache;
	struct inode *inode;
	int rc;

	osd_id_gen(&oic->oic_lid, ino, OSD_OII_NOGEN);
	inode = osd_iget(oti, dev, &oic->oic_lid);
	if (IS_ERR(inode)) {
		fid_zero(&oic->oic_fid);
		return PTR_ERR(inode);
	}

	rc = osd_get_lma(oti, inode, &oti->oti_obj_dentry, loa);
	iput(inode);
	if (rc != 0)
		fid_zero(&oic->oic_fid);
	else
		*fid = oic->oic_fid = loa->loa_lma.lma_self_fid;
	return rc;
}

void osd_add_oi_cache(struct osd_thread_info *info, struct osd_device *osd,
		      struct osd_inode_id *id, const struct lu_fid *fid)
{
	CDEBUG(D_INODE, "add "DFID" %u:%u to info %p\n", PFID(fid),
	       id->oii_ino, id->oii_gen, info);
	info->oti_cache.oic_lid = *id;
	info->oti_cache.oic_fid = *fid;
	info->oti_cache.oic_dev = osd;
}

/**
 * Get parent FID from the linkEA.
 *
 * For a directory which parent resides on remote MDT, to satisfy the
 * local e2fsck, we insert it into the /REMOTE_PARENT_DIR locally. On
 * the other hand, to make the lookup(..) on the directory can return
 * the real parent FID, we append the real parent FID after its ".."
 * name entry in the /REMOTE_PARENT_DIR.
 *
 * Unfortunately, such PFID-in-dirent cannot be preserved via file-level
 * backup. So after the restore, we cannot get the right parent FID from
 * its ".." name entry in the /REMOTE_PARENT_DIR. Under such case, since
 * we have stored the real parent FID in the directory object's linkEA,
 * we can parse the linkEA for the real parent FID.
 *
 * \param[in] env	pointer to the thread context
 * \param[in] obj	pointer to the object to be handled
 * \param[out]fid	pointer to the buffer to hold the parent FID
 *
 * \retval		0 for getting the real parent FID successfully
 * \retval		negative error number on failure
 */
static int osd_get_pfid_from_linkea(const struct lu_env *env,
				    struct osd_object *obj,
				    struct lu_fid *fid)
{
	struct osd_thread_info *oti = osd_oti_get(env);
	struct lu_buf *buf = &oti->oti_big_buf;
	struct dentry *dentry = &oti->oti_obj_dentry;
	struct inode *inode = obj->oo_inode;
	struct linkea_data ldata = { NULL };
	int rc;

	ENTRY;

	fid_zero(fid);
	if (!S_ISDIR(inode->i_mode))
		RETURN(-EIO);

again:
	rc = __osd_xattr_get(inode, dentry, XATTR_NAME_LINK,
			     buf->lb_buf, buf->lb_len);
	if (rc == -ERANGE) {
		rc = __osd_xattr_get(inode, dentry, XATTR_NAME_LINK,
				     NULL, 0);
		if (rc > 0) {
			lu_buf_realloc(buf, rc);
			if (buf->lb_buf == NULL)
				RETURN(-ENOMEM);

			goto again;
		}
	}

	if (unlikely(rc == 0))
		RETURN(-ENODATA);

	if (rc < 0)
		RETURN(rc);

	if (unlikely(buf->lb_buf == NULL)) {
		lu_buf_realloc(buf, rc);
		if (buf->lb_buf == NULL)
			RETURN(-ENOMEM);

		goto again;
	}

	ldata.ld_buf = buf;
	rc = linkea_init_with_rec(&ldata);
	if (!rc) {
		linkea_first_entry(&ldata);
		linkea_entry_unpack(ldata.ld_lee, &ldata.ld_reclen, NULL, fid);
	}

	RETURN(rc);
}

static int osd_verify_ent_by_linkea(const struct lu_env *env,
				    struct inode *inode,
				    const struct lu_fid *pfid,
				    const char *name, const int namelen)
{
	struct osd_thread_info *oti = osd_oti_get(env);
	struct lu_buf *buf = &oti->oti_big_buf;
	struct dentry *dentry = &oti->oti_obj_dentry;
	struct linkea_data ldata = { NULL };
	struct lu_name cname = { .ln_name = name,
				 .ln_namelen = namelen };
	int rc;

	ENTRY;

again:
	rc = __osd_xattr_get(inode, dentry, XATTR_NAME_LINK,
			     buf->lb_buf, buf->lb_len);
	if (rc == -ERANGE)
		rc = __osd_xattr_get(inode, dentry, XATTR_NAME_LINK, NULL, 0);

	if (rc < 0)
		RETURN(rc);

	if (unlikely(rc == 0))
		RETURN(-ENODATA);

	if (buf->lb_len < rc) {
		lu_buf_realloc(buf, rc);
		if (buf->lb_buf == NULL)
			RETURN(-ENOMEM);

		goto again;
	}

	ldata.ld_buf = buf;
	rc = linkea_init_with_rec(&ldata);
	if (!rc)
		rc = linkea_links_find(&ldata, &cname, pfid);

	RETURN(rc);
}

/**
 * Calls ->lookup() to find dentry. From dentry get inode and
 * read inode's ea to get fid. This is required for  interoperability
 * mode (b11826)
 *
 * \retval   0, on success
 * \retval -ve, on error
 */
static int osd_ea_lookup_rec(const struct lu_env *env, struct osd_object *obj,
			     struct dt_rec *rec, const struct dt_key *key)
{
	struct inode *dir = obj->oo_inode;
	struct dentry *dentry;
	struct ldiskfs_dir_entry_2 *de;
	struct buffer_head *bh;
	struct lu_fid *fid = (struct lu_fid *)rec;
	struct htree_lock *hlock = NULL;
	struct lu_name ln;
	int ino;
	int rc;

	ENTRY;

	LASSERT(dir->i_op != NULL);
	LASSERT(dir->i_op->lookup != NULL);

	rc = obj_name2lu_name(obj, (char *)key, strlen((char *)key), &ln);
	if (rc)
		RETURN(rc);

	dentry = osd_child_dentry_get(env, obj, ln.ln_name, ln.ln_namelen);

	if (obj->oo_hl_head != NULL) {
		hlock = osd_oti_get(env)->oti_hlock;
		ldiskfs_htree_lock(hlock, obj->oo_hl_head,
				   dir, LDISKFS_HLOCK_LOOKUP);
	} else {
		down_read(&obj->oo_ext_idx_sem);
	}

	bh = osd_ldiskfs_find_entry(dir, &dentry->d_name, &de, NULL, hlock);
	if (!IS_ERR(bh)) {
		struct osd_thread_info *oti = osd_oti_get(env);
		struct osd_inode_id *id = &oti->oti_id;
		struct osd_device *dev = osd_obj2dev(obj);

		ino = le32_to_cpu(de->inode);
		if (CFS_FAIL_CHECK(OBD_FAIL_FID_LOOKUP)) {
			brelse(bh);
			rc = osd_fail_fid_lookup(oti, dev, fid, ino);
			GOTO(out, rc);
		}

		rc = osd_get_fid_from_dentry(de, rec);

		/* done with de, release bh */
		brelse(bh);
		if (rc != 0) {
			if (unlikely(is_remote_parent_ino(dev, ino))) {
				const char *name = (const char *)key;

				/*
				 * If the parent is on remote MDT, and there
				 * is no FID-in-dirent, then we have to get
				 * the parent FID from the linkEA.
				 */
				if (likely(strlen(name) == 2 &&
					   name[0] == '.' && name[1] == '.'))
					rc = osd_get_pfid_from_linkea(env, obj,
								      fid);
			} else {
				rc = osd_ea_fid_get(env, obj, ino, fid, id);
			}
		} else {
			osd_id_gen(id, ino, OSD_OII_NOGEN);
		}

		if (rc != 0 || osd_remote_fid(env, dev, fid))
			GOTO(out, rc);

		rc = osd_ldiskfs_consistency_check(oti, dev, fid, id);
		if (rc != -ENOENT) {
			/* Other error should not affect lookup result. */
			rc = 0;

			/* Normal file mapping should be added into OI cache
			 * after FID in LMA check, but for local files like
			 * hsm_actions, their FIDs are not stored in OI files,
			 * see osd_initial_OI_scrub(), and here is the only
			 * place to load mapping into OI cache.
			 */
			if (!fid_is_namespace_visible(fid))
				osd_add_oi_cache(osd_oti_get(env),
						 osd_obj2dev(obj), id, fid);
		}
		CDEBUG(D_INODE, DFID"/"DNAME" => "DFID"\n",
		       PFID(lu_object_fid(&obj->oo_dt.do_lu)), PNAME(&ln),
		       PFID(fid));
	} else {
		rc = PTR_ERR(bh);
	}

	GOTO(out, rc);

out:
	if (hlock != NULL)
		ldiskfs_htree_unlock(hlock);
	else
		up_read(&obj->oo_ext_idx_sem);
	if (ln.ln_name != (char *)key)
		kfree(ln.ln_name);
	RETURN(rc);
}

static int osd_index_declare_ea_insert(const struct lu_env *env,
				       struct dt_object *dt,
				       const struct dt_rec *rec,
				       const struct dt_key *key,
				       struct thandle *handle)
{
	struct osd_thandle *oh;
	struct osd_device *osd = osd_dev(dt->do_lu.lo_dev);
	struct dt_insert_rec *rec1 = (struct dt_insert_rec *)rec;
	const struct lu_fid *fid = rec1->rec_fid;
	int credits, rc = 0;
	struct osd_idmap_cache *idc;

	ENTRY;

	LASSERT(!dt_object_remote(dt));
	LASSERT(handle != NULL);
	LASSERT(fid != NULL);
	LASSERT(rec1->rec_type != 0);

	oh = container_of(handle, struct osd_thandle, ot_super);
	LASSERT(oh->ot_handle == NULL);

	credits = osd_dto_credits_noquota[DTO_INDEX_INSERT];

	/*
	 * we can't call iget() while a transactions is running
	 * (this can lead to a deadlock), but we need to know
	 * inum and object type. so we find this information at
	 * declaration and cache in per-thread info
	 */
	idc = osd_idc_find_or_init(env, osd, fid);
	if (IS_ERR(idc))
		RETURN(PTR_ERR(idc));
	if (idc->oic_remote) {
		/*
		 * a reference to remote inode is represented by an
		 * agent inode which we have to create
		 */
		credits += osd_dto_credits_noquota[DTO_OBJECT_CREATE];
		credits += osd_dto_credits_noquota[DTO_INDEX_INSERT];
	}

	osd_trans_declare_op(env, oh, OSD_OT_INSERT, credits);

	if (osd_dt_obj(dt)->oo_inode != NULL) {
		struct inode *inode = osd_dt_obj(dt)->oo_inode;

		/*
		 * We ignore block quota on meta pool (MDTs), so needn't
		 * calculate how many blocks will be consumed by this index
		 * insert
		 */
		rc = osd_declare_inode_qid(env, i_uid_read(inode),
					   i_gid_read(inode),
					   i_projid_read(inode), 0,
					   oh, osd_dt_obj(dt), NULL,
					   OSD_QID_BLK);
		if (rc)
			RETURN(rc);

#ifdef HAVE_PROJECT_QUOTA
		/*
		 * Reserve credits for local agent inode to transfer
		 * to 0, quota enforcement is ignored in this case.
		 */
		if (idc->oic_remote &&
		    LDISKFS_I(inode)->i_flags & LUSTRE_PROJINHERIT_FL &&
		    i_projid_read(inode) != 0)
			rc = osd_declare_attr_qid(env, osd_dt_obj(dt), oh,
						  0, i_projid_read(inode),
						  0, false, PRJQUOTA);
#endif
	}

	RETURN(rc);
}

/**
 * Index add function for interoperability mode (b11826).
 * It will add the directory entry.This entry is needed to
 * maintain name->fid mapping.
 *
 * \param key it is key i.e. file entry to be inserted
 * \param rec it is value of given key i.e. fid
 *
 * \retval   0, on success
 * \retval -ve, on error
 */
static int osd_index_ea_insert(const struct lu_env *env, struct dt_object *dt,
			       const struct dt_rec *rec,
			       const struct dt_key *key, struct thandle *th)
{
	struct osd_object *obj = osd_dt_obj(dt);
	struct osd_device *osd = osd_dev(dt->do_lu.lo_dev);
	struct dt_insert_rec *rec1 = (struct dt_insert_rec *)rec;
	const struct lu_fid *fid = rec1->rec_fid;
	const char *name = (const char *)key;
	struct osd_thread_info *oti = osd_oti_get(env);
	struct inode *child_inode = NULL;
	struct osd_idmap_cache *idc;
	int rc;

	ENTRY;

	if (!dt_object_exists(dt))
		RETURN(-ENOENT);

	LASSERT(osd_invariant(obj));
	LASSERT(!dt_object_remote(dt));
	LASSERT(th != NULL);

	osd_trans_exec_op(env, th, OSD_OT_INSERT);

	LASSERTF(fid_is_sane(fid), "fid"DFID" is insane!\n", PFID(fid));

	idc = osd_idc_find(env, osd, fid);
	if (unlikely(idc == NULL)) {
		idc = osd_idc_find_or_init(env, osd, fid);
		if (IS_ERR(idc)) {
			/*
			 * this dt_insert() wasn't declared properly, so
			 * FID is missing in OI cache. we better do not
			 * lookup FID in FLDB/OI and don't risk to deadlock,
			 * but in some special cases (lfsck testing, etc)
			 * it's much simpler than fixing a caller.
			 *
			 * normally this error should be placed after the first
			 * find, but migrate may attach source stripes to
			 * target, which doesn't create stripes.
			 */
			CERROR("%s: "DFID" wasn't declared for insert\n",
			       osd_name(osd), PFID(fid));
			dump_stack();
			RETURN(PTR_ERR(idc));
		}
	}

	if (idc->oic_remote) {
		/* Insert remote entry */
		if (strcmp(name, dotdot) == 0 && strlen(name) == 2) {
			child_inode =
			igrab(osd->od_mdt_map->omm_remote_parent->d_inode);
		} else {
			child_inode = osd_create_local_agent_inode(env, osd,
					obj, fid, rec1->rec_type & S_IFMT, th);
			if (IS_ERR(child_inode))
				RETURN(PTR_ERR(child_inode));
		}
	} else {
		/* Insert local entry */
		if (unlikely(idc->oic_lid.oii_ino == 0)) {
			/* for a reason OI cache wasn't filled properly */
			CERROR("%s: OIC for "DFID" isn't filled\n",
			       osd_name(osd), PFID(fid));
			RETURN(-EINVAL);
		}
		child_inode = oti->oti_inode;
		if (unlikely(child_inode == NULL)) {
			struct ldiskfs_inode_info *lii;

			OBD_ALLOC_PTR(lii);
			if (lii == NULL)
				RETURN(-ENOMEM);
			child_inode = oti->oti_inode = &lii->vfs_inode;
		}
		child_inode->i_sb = osd_sb(osd);
		child_inode->i_ino = idc->oic_lid.oii_ino;
		child_inode->i_mode = rec1->rec_type & S_IFMT;
	}

	rc = osd_ea_add_rec(env, obj, child_inode, name, fid, th);

	CDEBUG(D_INODE, "parent %lu insert %s:%lu rc = %d\n",
	       obj->oo_inode->i_ino, name, child_inode->i_ino, rc);

	if (child_inode && child_inode != oti->oti_inode)
		iput(child_inode);
	LASSERT(osd_invariant(obj));
	osd_trans_exec_check(env, th, OSD_OT_INSERT);

	RETURN(rc);
}

/**
 *  Initialize osd Iterator for given osd index object.
 *
 *  \param  dt      osd index object
 */

static struct dt_it *osd_it_iam_init(const struct lu_env *env,
				     struct dt_object *dt,
				     __u32 unused)
{
	struct osd_it_iam *it;
	struct osd_object *obj = osd_dt_obj(dt);
	struct lu_object *lo = &dt->do_lu;
	struct iam_path_descr *ipd;
	struct iam_container *bag = &obj->oo_dir->od_container;

	if (!dt_object_exists(dt))
		return ERR_PTR(-ENOENT);

	OBD_ALLOC_PTR(it);
	if (it == NULL)
		return ERR_PTR(-ENOMEM);

	ipd = osd_it_ipd_get(env, bag);
	if (likely(ipd != NULL)) {
		it->oi_obj = obj;
		it->oi_ipd = ipd;
		lu_object_get(lo);
		iam_it_init(&it->oi_it, bag, IAM_IT_MOVE, ipd);
		return (struct dt_it *)it;
	} else {
		OBD_FREE_PTR(it);
		return ERR_PTR(-ENOMEM);
	}
}

/**
 * free given Iterator.
 */
static void osd_it_iam_fini(const struct lu_env *env, struct dt_it *di)
{
	struct osd_it_iam *it  = (struct osd_it_iam *)di;
	struct osd_object *obj = it->oi_obj;

	iam_it_fini(&it->oi_it);
	osd_ipd_put(env, &obj->oo_dir->od_container, it->oi_ipd);
	osd_object_put(env, obj);
	OBD_FREE_PTR(it);
}

/**
 *  Move Iterator to record specified by \a key
 *
 *  \param  di      osd iterator
 *  \param  key     key for index
 *
 *  \retval +ve  di points to record with least key not larger than key
 *  \retval  0   di points to exact matched key
 *  \retval -ve  failure
 */

static int osd_it_iam_get(const struct lu_env *env,
			  struct dt_it *di, const struct dt_key *key)
{
	struct osd_thread_info *oti = osd_oti_get(env);
	struct osd_it_iam *it = (struct osd_it_iam *)di;

	if (fid_is_quota(lu_object_fid(&it->oi_obj->oo_dt.do_lu))) {
		/* swab quota uid/gid */
		oti->oti_quota_id = cpu_to_le64(*((__u64 *)key));
		key = (struct dt_key *)&oti->oti_quota_id;
	}

	return iam_it_get(&it->oi_it, (const struct iam_key *)key);
}

/**
 *  Release Iterator
 *
 *  \param  di      osd iterator
 */
static void osd_it_iam_put(const struct lu_env *env, struct dt_it *di)
{
	struct osd_it_iam *it = (struct osd_it_iam *)di;

	iam_it_put(&it->oi_it);
}

/**
 *  Move iterator by one record
 *
 *  \param  di      osd iterator
 *
 *  \retval +1   end of container reached
 *  \retval  0   success
 *  \retval -ve  failure
 */

static int osd_it_iam_next(const struct lu_env *env, struct dt_it *di)
{
	struct osd_it_iam *it = (struct osd_it_iam *)di;

	return iam_it_next(&it->oi_it);
}

/**
 * Return pointer to the key under iterator.
 */

static struct dt_key *osd_it_iam_key(const struct lu_env *env,
				     const struct dt_it *di)
{
	struct osd_thread_info *oti = osd_oti_get(env);
	struct osd_it_iam *it = (struct osd_it_iam *)di;
	struct osd_object *obj = it->oi_obj;
	struct dt_key *key;

	key = (struct dt_key *)iam_it_key_get(&it->oi_it);

	if (!IS_ERR(key) && fid_is_quota(lu_object_fid(&obj->oo_dt.do_lu))) {
		/* swab quota uid/gid */
		oti->oti_quota_id = le64_to_cpu(*((__u64 *)key));
		key = (struct dt_key *)&oti->oti_quota_id;
	}

	return key;
}

/**
 * Return size of key under iterator (in bytes)
 */

static int osd_it_iam_key_size(const struct lu_env *env, const struct dt_it *di)
{
	struct osd_it_iam *it = (struct osd_it_iam *)di;

	return iam_it_key_size(&it->oi_it);
}

static inline void
osd_it_append_attrs(struct lu_dirent *ent, int len, __u16 type)
{
	/* check if file type is required */
	if (ent->lde_attrs & LUDA_TYPE) {
		struct luda_type *lt;
		int align = sizeof(*lt) - 1;

		len = (len + align) & ~align;
		lt = (struct luda_type *)(ent->lde_name + len);
		lt->lt_type = cpu_to_le16(DTTOIF(type));
	}

	ent->lde_attrs = cpu_to_le32(ent->lde_attrs);
}

/**
 * build lu direct from backend fs dirent.
 */

static inline void
osd_it_pack_dirent(struct lu_dirent *ent, struct lu_fid *fid, __u64 offset,
		   char *name, __u16 namelen, __u16 type, __u32 attr)
{
	ent->lde_attrs = attr | LUDA_FID;
	fid_cpu_to_le(&ent->lde_fid, fid);

	ent->lde_hash = cpu_to_le64(offset);
	ent->lde_reclen = cpu_to_le16(lu_dirent_calc_size(namelen, attr));

	strncpy(ent->lde_name, name, namelen);
	ent->lde_name[namelen] = '\0';
	ent->lde_namelen = cpu_to_le16(namelen);

	/* append lustre attributes */
	osd_it_append_attrs(ent, namelen, type);
}

/**
 * Return pointer to the record under iterator.
 */
static int osd_it_iam_rec(const struct lu_env *env,
			  const struct dt_it *di,
			  struct dt_rec *dtrec, __u32 attr)
{
	struct osd_it_iam *it = (struct osd_it_iam *)di;
	struct osd_thread_info *info = osd_oti_get(env);

	ENTRY;

	if (S_ISDIR(it->oi_obj->oo_inode->i_mode)) {
		const struct osd_fid_pack *rec;
		struct lu_fid *fid = &info->oti_fid;
		struct lu_dirent *lde = (struct lu_dirent *)dtrec;
		char *name;
		int namelen;
		__u64 hash;
		int rc;

		name = (char *)iam_it_key_get(&it->oi_it);
		if (IS_ERR(name))
			RETURN(PTR_ERR(name));

		namelen = iam_it_key_size(&it->oi_it);

		rec = (const struct osd_fid_pack *)iam_it_rec_get(&it->oi_it);
		if (IS_ERR(rec))
			RETURN(PTR_ERR(rec));

		rc = osd_fid_unpack(fid, rec);
		if (rc)
			RETURN(rc);

		hash = iam_it_store(&it->oi_it);

		/* IAM does not store object type in IAM index (dir) */
		osd_it_pack_dirent(lde, fid, hash, name, namelen,
				   0, LUDA_FID);
	} else if (fid_is_quota(lu_object_fid(&it->oi_obj->oo_dt.do_lu))) {
		iam_reccpy(&it->oi_it.ii_path.ip_leaf,
			   (struct iam_rec *)dtrec);
		osd_quota_unpack(it->oi_obj, dtrec);
	} else {
		iam_reccpy(&it->oi_it.ii_path.ip_leaf,
			   (struct iam_rec *)dtrec);
	}

	RETURN(0);
}

/**
 * Returns cookie for current Iterator position.
 */
static __u64 osd_it_iam_store(const struct lu_env *env, const struct dt_it *di)
{
	struct osd_it_iam *it = (struct osd_it_iam *)di;

	return iam_it_store(&it->oi_it);
}

/**
 * Restore iterator from cookie.
 *
 * \param  di      osd iterator
 * \param  hash    Iterator location cookie
 *
 * \retval +ve  di points to record with least key not larger than key.
 * \retval  0   di points to exact matched key
 * \retval -ve  failure
 */

static int osd_it_iam_load(const struct lu_env *env,
			   const struct dt_it *di, __u64 hash)
{
	struct osd_it_iam *it = (struct osd_it_iam *)di;

	return iam_it_load(&it->oi_it, hash);
}

static const struct dt_index_operations osd_index_iam_ops = {
	.dio_lookup         = osd_index_iam_lookup,
	.dio_declare_insert = osd_index_declare_iam_insert,
	.dio_insert         = osd_index_iam_insert,
	.dio_declare_delete = osd_index_declare_iam_delete,
	.dio_delete         = osd_index_iam_delete,
	.dio_it     = {
		.init     = osd_it_iam_init,
		.fini     = osd_it_iam_fini,
		.get      = osd_it_iam_get,
		.put      = osd_it_iam_put,
		.next     = osd_it_iam_next,
		.key      = osd_it_iam_key,
		.key_size = osd_it_iam_key_size,
		.rec      = osd_it_iam_rec,
		.store    = osd_it_iam_store,
		.load     = osd_it_iam_load
	}
};

struct osd_it_ea *osd_it_dir_init(const struct lu_env *env,
				  struct osd_device *dev,
				  struct inode *inode, u32 attr)
{
	struct osd_thread_info *info = osd_oti_get(env);
	struct osd_it_ea *oie;
	struct file *file;

	ENTRY;
	file = alloc_file_pseudo(inode, dev->od_mnt, "/", O_NOATIME,
				 inode->i_fop);
	if (IS_ERR(file))
		RETURN(ERR_CAST(file));

	/* Only FMODE_64BITHASH or FMODE_32BITHASH should be set, NOT both. */
	if (attr & LUDA_64BITHASH)
		file->f_mode |= FMODE_64BITHASH;
	else
		file->f_mode |= FMODE_32BITHASH;
	ihold(inode);

	OBD_SLAB_ALLOC_PTR(oie, osd_itea_cachep);
	if (!oie)
		goto out_fput;

	oie->oie_rd_dirent       = 0;
	oie->oie_it_dirent       = 0;
	oie->oie_dirent          = NULL;
	if (unlikely(!info->oti_it_ea_buf_used)) {
		oie->oie_buf = info->oti_it_ea_buf;
		info->oti_it_ea_buf_used = 1;
	} else {
		OBD_ALLOC(oie->oie_buf, OSD_IT_EA_BUFSIZE);
		if (!oie->oie_buf)
			goto out_free;
	}
	oie->oie_obj = NULL;
	oie->oie_file = file;

	RETURN(oie);

out_free:
	OBD_SLAB_FREE_PTR(oie, osd_itea_cachep);
out_fput:
	fput(file);

	return ERR_PTR(-ENOMEM);
}

/**
 * Creates or initializes iterator context.
 *
 * \retval struct osd_it_ea, iterator structure on success
 *
 */
static struct dt_it *osd_it_ea_init(const struct lu_env *env,
				    struct dt_object *dt,
				    __u32 attr)
{
	struct osd_object *obj = osd_dt_obj(dt);
	struct osd_device *dev = osd_obj2dev(obj);
	struct lu_object *lo = &dt->do_lu;
	struct osd_it_ea *oie;

	ENTRY;

	if (!dt_object_exists(dt) || obj->oo_destroyed)
		RETURN(ERR_PTR(-ENOENT));

	oie = osd_it_dir_init(env, dev, obj->oo_inode, attr);
	if (IS_ERR(oie))
		RETURN(ERR_CAST(oie));

	oie->oie_obj = obj;
	lu_object_get(lo);
	RETURN((struct dt_it *)oie);
}

void osd_it_dir_fini(const struct lu_env *env, struct osd_it_ea *oie,
		     struct inode *inode)
{
	struct osd_thread_info *info = osd_oti_get(env);

	ENTRY;
	fput(oie->oie_file);
	if (unlikely(oie->oie_buf != info->oti_it_ea_buf))
		OBD_FREE(oie->oie_buf, OSD_IT_EA_BUFSIZE);
	else
		info->oti_it_ea_buf_used = 0;
	OBD_SLAB_FREE_PTR(oie, osd_itea_cachep);
	EXIT;
}

/**
 * Destroy or finishes iterator context.
 *
 * \param di iterator structure to be destroyed
 */
static void osd_it_ea_fini(const struct lu_env *env, struct dt_it *di)
{
	struct osd_it_ea *oie = (struct osd_it_ea *)di;
	struct osd_object *obj = oie->oie_obj;
	struct inode *inode = obj->oo_inode;

	ENTRY;
	osd_it_dir_fini(env, (struct osd_it_ea *)di, inode);
	osd_object_put(env, obj);
	EXIT;
}

/**
 * It position the iterator at given key, so that next lookup continues from
 * that key Or it is similar to dio_it->load() but based on a key,
 * rather than file position.
 *
 * As a special convention, osd_it_ea_get(env, di, "") has to rewind iterator
 * to the beginning.
 *
 * TODO: Presently return +1 considering it is only used by mdd_dir_is_empty().
 */
static int osd_it_ea_get(const struct lu_env *env,
			 struct dt_it *di, const struct dt_key *key)
{
	struct osd_it_ea *it = (struct osd_it_ea *)di;

	ENTRY;
	LASSERT(((const char *)key)[0] == '\0');
	it->oie_file->f_pos = 0;
	it->oie_rd_dirent = 0;
	it->oie_it_dirent = 0;
	it->oie_dirent = NULL;

	RETURN(+1);
}

/**
 * Does nothing
 */
static void osd_it_ea_put(const struct lu_env *env, struct dt_it *di)
{
}

struct osd_filldir_cbs {
	struct dir_context ctx;
	struct osd_it_ea  *it;
};
/**
 * It is called internally by ->iterate*(). It fills the
 * iterator's in-memory data structure with required
 * information i.e. name, namelen, rec_size etc.
 *
 * \param buf in which information to be filled in.
 * \param name name of the file in given dir
 *
 * \retval 0 on success
 * \retval 1 on buffer full
 */
#ifdef HAVE_FILLDIR_USE_CTX
static FILLDIR_TYPE do_osd_ldiskfs_filldir(struct dir_context *ctx,
#else
static int osd_ldiskfs_filldir(void *ctx,
#endif
			       const char *name, int namelen,
			       loff_t offset, __u64 ino, unsigned int d_type)
{
	struct osd_it_ea *it = ((struct osd_filldir_cbs *)ctx)->it;
	struct osd_object *obj = it->oie_obj;
	struct osd_it_ea_dirent *ent = it->oie_dirent;
	struct lu_fid *fid = &ent->oied_fid;
	char *buf = it->oie_buf;
	struct osd_fid_pack *rec;
	ENTRY;

	/* this should never happen */
	if (unlikely(namelen == 0 || namelen > LDISKFS_NAME_LEN)) {
		CERROR("ldiskfs return invalid namelen %d\n", namelen);
		RETURN(-EIO);
	}

	/* Check for enough space. Note oied_name is not NUL terminated. */
	if (&ent->oied_name[namelen] > buf + OSD_IT_EA_BUFSIZE)
		RETURN(1);

	/* "." is just the object itself. */
	if (namelen == 1 && name[0] == '.') {
		if (obj != NULL)
			*fid = obj->oo_dt.do_lu.lo_header->loh_fid;
	} else if (d_type & LDISKFS_DIRENT_LUFID) {
		rec = (struct osd_fid_pack *)(name + namelen + 1);
		if (osd_fid_unpack(fid, rec) != 0)
			fid_zero(fid);
	} else {
		fid_zero(fid);
	}
	d_type &= ~LDISKFS_DIRENT_LUFID;

	/* NOT export local root. */
	if (obj != NULL &&
	    unlikely(osd_sb(osd_obj2dev(obj))->s_root->d_inode->i_ino == ino)) {
		ino = obj->oo_inode->i_ino;
		*fid = obj->oo_dt.do_lu.lo_header->loh_fid;
	}

	if (obj == NULL || !(obj->oo_lma_flags & LUSTRE_ENCRYPT_FL)) {
		ent->oied_namelen = namelen;
		memcpy(ent->oied_name, name, namelen);
	} else {
		int encoded_namelen = critical_chars(name, namelen);

		/* Check again for enough space. */
		if (&ent->oied_name[encoded_namelen] > buf + OSD_IT_EA_BUFSIZE)
			RETURN(1);

		ent->oied_namelen = encoded_namelen;

		if (encoded_namelen == namelen)
			memcpy(ent->oied_name, name, namelen);
		else
			critical_encode(name, namelen, ent->oied_name);
	}

	ent->oied_ino     = ino;
	ent->oied_off     = offset;
	ent->oied_type    = d_type;

	it->oie_rd_dirent++;
	it->oie_dirent = (void *)ent + round_up(sizeof(*ent) + ent->oied_namelen, 8);
	RETURN(0);
}

WRAP_FILLDIR_FN(do_, osd_ldiskfs_filldir)

/**
 * Calls ->iterate*() to load a directory entry at a time
 * and stored it in iterator's in-memory data structure.
 *
 * \param di iterator's in memory structure
 *
 * \retval   0 on success
 * \retval -ve on error
 * \retval +1 reach the end of entry
 */
int osd_ldiskfs_it_fill(const struct lu_env *env, const struct dt_it *di)
{
	struct osd_it_ea *it = (struct osd_it_ea *)di;
	struct osd_object *obj = it->oie_obj;
	struct htree_lock *hlock = NULL;
	struct file *filp = it->oie_file;
	int rc = 0;
	struct osd_filldir_cbs buf = {
		.ctx.actor = osd_ldiskfs_filldir,
		.it = it
	};

	ENTRY;
	it->oie_dirent = it->oie_buf;
	it->oie_rd_dirent = 0;

	if (obj) {
		if (obj->oo_hl_head != NULL) {
			hlock = osd_oti_get(env)->oti_hlock;
			ldiskfs_htree_lock(hlock, obj->oo_hl_head,
					   obj->oo_inode,
					   LDISKFS_HLOCK_READDIR);
		} else {
			down_read(&obj->oo_ext_idx_sem);
		}
	}

	rc = iterate_dir(filp, &buf.ctx);
	if (rc)
		GOTO(unlock, rc);

	if (it->oie_rd_dirent == 0) {
		/*
		 * If it does not get any dirent, it means it has been reached
		 * to the end of the dir
		 */
		it->oie_file->f_pos = ldiskfs_get_htree_eof(it->oie_file);
		if (rc == 0)
			rc = 1;
	} else {
		it->oie_dirent = it->oie_buf;
		it->oie_it_dirent = 1;
	}
unlock:
	if (obj) {
		if (hlock != NULL)
			ldiskfs_htree_unlock(hlock);
		else
			up_read(&obj->oo_ext_idx_sem);
	}

	RETURN(rc);
}

/**
 * It calls osd_ldiskfs_it_fill() which will use ->iterate*()
 * to load a directory entry at a time and stored it in
 * iterator's in-memory data structure.
 *
 * \param di iterator's in memory structure
 *
 * \retval +ve iterator reached to end
 * \retval   0 iterator not reached to end
 * \retval -ve on error
 */
static int osd_it_ea_next(const struct lu_env *env, struct dt_it *di)
{
	struct osd_it_ea *it = (struct osd_it_ea *)di;
	int rc;

	ENTRY;

	if (it->oie_it_dirent < it->oie_rd_dirent) {
		it->oie_dirent =
			(void *)it->oie_dirent +
			round_up(sizeof(struct osd_it_ea_dirent) +
				       it->oie_dirent->oied_namelen, 8);
		it->oie_it_dirent++;
		rc = 0;
	} else {
		if (it->oie_file->f_pos == ldiskfs_get_htree_eof(it->oie_file))
			rc = 1;
		else
			rc = osd_ldiskfs_it_fill(env, di);
	}

	RETURN(rc);
}

/**
 * Returns the key at current position from iterator's in memory structure.
 *
 * \param di iterator's in memory structure
 *
 * \retval key i.e. struct dt_key on success
 */
static struct dt_key *osd_it_ea_key(const struct lu_env *env,
				    const struct dt_it *di)
{
	struct osd_it_ea *it = (struct osd_it_ea *)di;

	return (struct dt_key *)it->oie_dirent->oied_name;
}

/**
 * Returns key's size at current position from iterator's in memory structure.
 *
 * \param di iterator's in memory structure
 *
 * \retval key_size i.e. struct dt_key on success
 */
static int osd_it_ea_key_size(const struct lu_env *env, const struct dt_it *di)
{
	struct osd_it_ea *it = (struct osd_it_ea *)di;

	return it->oie_dirent->oied_namelen;
}

#if defined LDISKFS_DIR_ENTRY_LEN && defined LDISKFS_DIR_ENTRY_LEN_
#undef LDISKFS_DIR_REC_LEN
# if defined LDISKFS_DIR_REC_LEN_WITH_DIR
#  define LDISKFS_DIR_REC_LEN(de, dir)	LDISKFS_DIR_ENTRY_LEN_((de), (dir))
# else
#  define LDISKFS_DIR_REC_LEN(de)	LDISKFS_DIR_ENTRY_LEN_((de))
# endif
#endif

#if defined LDISKFS_DIR_REC_LEN_WITH_DIR
# define LDISKFS_DIR_REC_LEN_DIR(de)	LDISKFS_DIR_REC_LEN((de), NULL)
#else
# define LDISKFS_DIR_REC_LEN_DIR(de)	LDISKFS_DIR_REC_LEN((de))
#endif

static inline bool osd_dotdot_has_space(struct ldiskfs_dir_entry_2 *de)
{
	if (LDISKFS_DIR_REC_LEN_DIR(de) >=
	    __LDISKFS_DIR_REC_LEN(2 + 1 + sizeof(struct osd_fid_pack)))
		return true;

	return false;
}

static inline bool
osd_dirent_has_space(struct ldiskfs_dir_entry_2 *de, __u16 namelen,
		     unsigned int blocksize, bool dotdot)
{
	if (dotdot)
		return osd_dotdot_has_space(de);

	if (ldiskfs_rec_len_from_disk(de->rec_len, blocksize) >=
	    __LDISKFS_DIR_REC_LEN(namelen + 1 + sizeof(struct osd_fid_pack)))
		return true;

	return false;
}

static int
osd_dirent_reinsert(const struct lu_env *env, struct osd_device *dev,
		    handle_t *jh, struct dentry *dentry,
		    const struct lu_fid *fid, struct buffer_head *bh,
		    struct ldiskfs_dir_entry_2 *de, struct htree_lock *hlock,
		    bool dotdot)
{
	struct inode *dir = dentry->d_parent->d_inode;
	struct inode *inode = dentry->d_inode;
	struct osd_fid_pack *rec;
	struct ldiskfs_dentry_param *ldp;
	int namelen = dentry->d_name.len;
	int rc;
	struct osd_thread_info *info = osd_oti_get(env);

	ENTRY;

	if (!ldiskfs_has_feature_dirdata(inode->i_sb))
		RETURN(0);

	/* There is enough space to hold the FID-in-dirent. */
	if (osd_dirent_has_space(de, namelen, dir->i_sb->s_blocksize, dotdot)) {
		rc = osd_ldiskfs_journal_get_write_access(jh, dir->i_sb, bh,
							  LDISKFS_JTR_NONE);
		if (rc != 0)
			RETURN(rc);

		de->name[namelen] = 0;
		rec = (struct osd_fid_pack *)(de->name + namelen + 1);
		rec->fp_len = sizeof(struct lu_fid) + 1;
		fid_cpu_to_be((struct lu_fid *)rec->fp_area, fid);
		de->file_type |= LDISKFS_DIRENT_LUFID;
		rc = ldiskfs_handle_dirty_metadata(jh, NULL, bh);

		RETURN(rc);
	}

	LASSERT(!dotdot);

	rc = ldiskfs_delete_entry(jh, dir, de, bh);
	if (rc != 0)
		RETURN(rc);

	ldp = (struct ldiskfs_dentry_param *)osd_oti_get(env)->oti_ldp;
	osd_get_ldiskfs_dirent_param(ldp, fid);
	dentry->d_fsdata = (void *)ldp;
	dquot_initialize(dir);
	rc = osd_ldiskfs_add_entry(info, dev, jh, dentry, inode, hlock);
	/*
	 * It is too bad, we cannot reinsert the name entry back.
	 * That means we lose it!
	 */
	if (rc != 0)
		CDEBUG(D_LFSCK,
		       "%s: fail to reinsert the dirent, dir = %lu/%u, name = %.*s, "DFID": rc = %d\n",
		       osd_ino2name(inode), dir->i_ino, dir->i_generation,
		       namelen, dentry->d_name.name, PFID(fid), rc);

	RETURN(rc);
}

static int
osd_dirent_check_repair(const struct lu_env *env, struct osd_object *obj,
			struct osd_it_ea *it, struct lu_fid *fid,
			struct osd_inode_id *id, __u32 *attr)
{
	struct osd_thread_info *info = osd_oti_get(env);
	struct lustre_mdt_attrs *lma = &info->oti_ost_attrs.loa_lma;
	struct osd_device *dev = osd_obj2dev(obj);
	struct super_block *sb = osd_sb(dev);
	const char *devname = osd_name(dev);
	struct osd_it_ea_dirent *ent = it->oie_dirent;
	struct inode *dir = obj->oo_inode;
	struct htree_lock *hlock = NULL;
	struct buffer_head *bh = NULL;
	handle_t *jh = NULL;
	struct ldiskfs_dir_entry_2 *de;
	struct dentry *dentry;
	struct inode *inode;
	const struct lu_fid *pfid = lu_object_fid(&obj->oo_dt.do_lu);
	int credits;
	int rc;
	bool dotdot = false;
	bool dirty = false;
	struct lu_name ln;

	ENTRY;

	if (ent->oied_name[0] == '.') {
		if (ent->oied_namelen == 1)
			RETURN(0);

		if (ent->oied_namelen == 2 && ent->oied_name[1] == '.')
			dotdot = true;
	}

	osd_id_gen(id, ent->oied_ino, OSD_OII_NOGEN);
	inode = osd_iget(info, dev, id);
	if (IS_ERR(inode)) {
		rc = PTR_ERR(inode);
		if (rc == -ENOENT || rc == -ESTALE) {
			/*
			 * Maybe dangling name entry, or
			 * corrupted directory entry.
			 */
			*attr |= LUDA_UNKNOWN;
			rc = 0;
		} else {
			CDEBUG(D_LFSCK, "%s: fail to iget() for dirent "
			       "check_repair, dir = %lu/%u, name = %.*s, "
			       "ino = %llu, rc = %d\n",
			       devname, dir->i_ino, dir->i_generation,
			       ent->oied_namelen, ent->oied_name,
			       ent->oied_ino, rc);
		}

		RETURN(rc);
	}

	rc = obj_name2lu_name(obj, ent->oied_name, ent->oied_namelen, &ln);
	if (rc)
		RETURN(rc);

	dentry = osd_child_dentry_by_inode(env, dir, ln.ln_name, ln.ln_namelen);
	rc = osd_get_lma(info, inode, dentry, &info->oti_ost_attrs);
	if (rc == -ENODATA || !fid_is_sane(&lma->lma_self_fid))
		lma = NULL;
	else if (rc != 0)
		GOTO(out, rc);

	/*
	 * We need to ensure that the name entry is still valid.
	 * Because it may be removed or renamed by other already.
	 *
	 * The unlink or rename operation will start journal before PDO lock,
	 * so to avoid deadlock, here we need to start journal handle before
	 * related PDO lock also. But because we do not know whether there
	 * will be something to be repaired before PDO lock, we just start
	 * journal without conditions.
	 *
	 * We may need to remove the name entry firstly, then insert back.
	 * One credit is for user quota file update.
	 * One credit is for group quota file update.
	 * Two credits are for dirty inode.
	 */
	credits = osd_dto_credits_noquota[DTO_INDEX_DELETE] +
		  osd_dto_credits_noquota[DTO_INDEX_INSERT] + 1 + 1 + 2;

	if (dev->od_dirent_journal != 0) {

again:
		jh = osd_journal_start_sb(sb, LDISKFS_HT_MISC, credits);
		if (IS_ERR(jh)) {
			rc = PTR_ERR(jh);
			CDEBUG(D_LFSCK, "%s: fail to start trans for dirent "
			       "check_repair, dir = %lu/%u, credits = %d, "
			       "name = %.*s, ino = %llu: rc = %d\n",
			       devname, dir->i_ino, dir->i_generation, credits,
			       ent->oied_namelen, ent->oied_name,
			       ent->oied_ino, rc);

			GOTO(out_inode, rc);
		}

		if (obj->oo_hl_head != NULL) {
			hlock = osd_oti_get(env)->oti_hlock;
			/*
			 * "0" means exclusive lock for the whole directory.
			 * We need to prevent others access such name entry
			 * during the delete + insert. Neither HLOCK_ADD nor
			 * HLOCK_DEL cannot guarantee the atomicity.
			 */
			ldiskfs_htree_lock(hlock, obj->oo_hl_head, dir, 0);
		} else {
			down_write(&obj->oo_ext_idx_sem);
		}
	} else {
		if (obj->oo_hl_head != NULL) {
			hlock = osd_oti_get(env)->oti_hlock;
			ldiskfs_htree_lock(hlock, obj->oo_hl_head, dir,
					   LDISKFS_HLOCK_LOOKUP);
		} else {
			down_read(&obj->oo_ext_idx_sem);
		}
	}

	bh = osd_ldiskfs_find_entry(dir, &dentry->d_name, &de, NULL, hlock);
	if (IS_ERR(bh) || le32_to_cpu(de->inode) != inode->i_ino) {
		*attr |= LUDA_IGNORE;

		GOTO(out, rc = 0);
	}

	/*
	 * For dotdot entry, if there is not enough space to hold the
	 * FID-in-dirent, just keep them there. It only happens when the
	 * device upgraded from 1.8 or restored from MDT file-level backup.
	 * For the whole directory, only dotdot entry have no FID-in-dirent
	 * and needs to get FID from LMA when readdir, it will not affect the
	 * performance much.
	 */
	if (dotdot && !osd_dotdot_has_space(de)) {
		*attr |= LUDA_UNKNOWN;

		GOTO(out, rc = 0);
	}

	if (lma != NULL) {
		if (lu_fid_eq(fid, &lma->lma_self_fid))
			GOTO(out, rc = 0);

		if (unlikely(lma->lma_compat & LMAC_NOT_IN_OI)) {
			struct lu_fid *tfid = &lma->lma_self_fid;

			if (likely(dotdot &&
				   fid_seq(tfid) == FID_SEQ_LOCAL_FILE &&
				   fid_oid(tfid) == REMOTE_PARENT_DIR_OID)) {
				/*
				 * It must be REMOTE_PARENT_DIR and as the
				 * 'dotdot' entry of remote directory
				 */
				*attr |= LUDA_IGNORE;
			} else {
				CDEBUG(D_LFSCK, "%s: expect remote agent "
				       "parent directory, but got %.*s under "
				       "dir = %lu/%u with the FID "DFID"\n",
				       devname, ent->oied_namelen,
				       ent->oied_name, dir->i_ino,
				       dir->i_generation, PFID(tfid));

				*attr |= LUDA_UNKNOWN;
			}

			GOTO(out, rc = 0);
		}
	}

	if (!fid_is_zero(fid)) {
		rc = osd_verify_ent_by_linkea(env, inode, pfid, ent->oied_name,
					      ent->oied_namelen);
		if (rc == -ENOENT ||
		    (rc == -ENODATA &&
		     !(dev->od_scrub.os_scrub.os_file.sf_flags & SF_UPGRADE))) {
			/*
			 * linkEA does not recognize the dirent entry,
			 * it may because the dirent entry corruption
			 * and points to other's inode.
			 */
			CDEBUG(D_LFSCK, "%s: the target inode does not "
			       "recognize the dirent, dir = %lu/%u, "
			       " name = %.*s, ino = %llu, "
			       DFID": rc = %d\n", devname, dir->i_ino,
			       dir->i_generation, ent->oied_namelen,
			       ent->oied_name, ent->oied_ino, PFID(fid), rc);
			*attr |= LUDA_UNKNOWN;

			GOTO(out, rc = 0);
		}

		if (rc && rc != -ENODATA) {
			CDEBUG(D_LFSCK, "%s: fail to verify FID in the dirent, "
			       "dir = %lu/%u, name = %.*s, ino = %llu, "
			       DFID": rc = %d\n", devname, dir->i_ino,
			       dir->i_generation, ent->oied_namelen,
			       ent->oied_name, ent->oied_ino, PFID(fid), rc);
			*attr |= LUDA_UNKNOWN;

			GOTO(out, rc = 0);
		}
	}

	if (lma != NULL) {
		/*
		 * linkEA recognizes the dirent entry, the FID-in-LMA is
		 * valid, trusted, in spite of fid_is_sane(fid) or not.
		 */
		if (*attr & LUDA_VERIFY_DRYRUN) {
			*fid = lma->lma_self_fid;
			*attr |= LUDA_REPAIR;

			GOTO(out, rc = 0);
		}

		if (jh == NULL) {
			brelse(bh);
			dev->od_dirent_journal = 1;
			if (hlock != NULL) {
				ldiskfs_htree_unlock(hlock);
				hlock = NULL;
			} else {
				up_read(&obj->oo_ext_idx_sem);
			}

			goto again;
		}

		*fid = lma->lma_self_fid;
		dirty = true;
		/* Update or append the FID-in-dirent. */
		rc = osd_dirent_reinsert(env, dev, jh, dentry, fid,
					 bh, de, hlock, dotdot);
		if (rc == 0)
			*attr |= LUDA_REPAIR;
		else
			CDEBUG(D_LFSCK, "%s: fail to re-insert FID after "
			       "the dirent, dir = %lu/%u, name = %.*s, "
			       "ino = %llu, "DFID": rc = %d\n",
			       devname, dir->i_ino, dir->i_generation,
			       ent->oied_namelen, ent->oied_name,
			       ent->oied_ino, PFID(fid), rc);
	} else {
		/* lma is NULL, trust the FID-in-dirent if it is valid. */
		if (*attr & LUDA_VERIFY_DRYRUN) {
			if (fid_is_sane(fid)) {
				*attr |= LUDA_REPAIR;
			} else if (dev->od_index == 0) {
				lu_igif_build(fid, inode->i_ino,
					      inode->i_generation);
				*attr |= LUDA_UPGRADE;
			}

			GOTO(out, rc = 0);
		}

		if (jh == NULL) {
			brelse(bh);
			dev->od_dirent_journal = 1;
			if (hlock != NULL) {
				ldiskfs_htree_unlock(hlock);
				hlock = NULL;
			} else {
				up_read(&obj->oo_ext_idx_sem);
			}

			goto again;
		}

		dirty = true;
		if (unlikely(fid_is_sane(fid))) {
			/*
			 * FID-in-dirent exists, but FID-in-LMA is lost.
			 * Trust the FID-in-dirent, and add FID-in-LMA.
			 */
			rc = osd_ea_fid_set(info, inode, fid, 0, 0);
			if (rc == 0)
				*attr |= LUDA_REPAIR;
			else
				CDEBUG(D_LFSCK, "%s: fail to set LMA for "
				       "update dirent, dir = %lu/%u, "
				       "name = %.*s, ino = %llu, "
				       DFID": rc = %d\n",
				       devname, dir->i_ino, dir->i_generation,
				       ent->oied_namelen, ent->oied_name,
				       ent->oied_ino, PFID(fid), rc);
		} else if (dev->od_index == 0) {
			lu_igif_build(fid, inode->i_ino, inode->i_generation);
			/*
			 * It is probably IGIF object. Only aappend the
			 * FID-in-dirent. OI scrub will process FID-in-LMA.
			 */
			rc = osd_dirent_reinsert(env, dev, jh, dentry, fid,
						 bh, de, hlock, dotdot);
			if (rc == 0)
				*attr |= LUDA_UPGRADE;
			else
				CDEBUG(D_LFSCK, "%s: fail to append IGIF "
				       "after the dirent, dir = %lu/%u, "
				       "name = %.*s, ino = %llu, "
				       DFID": rc = %d\n",
				       devname, dir->i_ino, dir->i_generation,
				       ent->oied_namelen, ent->oied_name,
				       ent->oied_ino, PFID(fid), rc);
		}
	}

	GOTO(out, rc);

out:
	if (!IS_ERR(bh))
		brelse(bh);
	if (hlock != NULL) {
		ldiskfs_htree_unlock(hlock);
	} else {
		if (dev->od_dirent_journal != 0)
			up_write(&obj->oo_ext_idx_sem);
		else
			up_read(&obj->oo_ext_idx_sem);
	}

	if (jh != NULL)
		ldiskfs_journal_stop(jh);

out_inode:
	iput(inode);
	if (rc >= 0 && !dirty)
		dev->od_dirent_journal = 0;
	if (ln.ln_name != ent->oied_name)
		kfree(ln.ln_name);

	return rc;
}

/**
 * Returns the value at current position from iterator's in memory structure.
 *
 * \param di struct osd_it_ea, iterator's in memory structure
 * \param attr attr requested for dirent.
 * \param lde lustre dirent
 *
 * \retval   0 no error and \param lde has correct lustre dirent.
 * \retval -ve on error
 */
static inline int osd_it_ea_rec(const struct lu_env *env,
				const struct dt_it *di,
				struct dt_rec *dtrec, __u32 attr)
{
	struct osd_it_ea       *it    = (struct osd_it_ea *)di;
	struct osd_object      *obj   = it->oie_obj;
	struct osd_device      *dev   = osd_obj2dev(obj);
	struct osd_thread_info *oti   = osd_oti_get(env);
	struct osd_inode_id    *id    = &oti->oti_id;
	struct lu_fid          *fid   = &it->oie_dirent->oied_fid;
	struct lu_dirent       *lde   = (struct lu_dirent *)dtrec;
	__u32 ino = it->oie_dirent->oied_ino;
	int rc = 0;

	ENTRY;

	LASSERT(!is_remote_parent_ino(dev, obj->oo_inode->i_ino));

	if (attr & LUDA_VERIFY) {
		if (unlikely(is_remote_parent_ino(dev, ino))) {
			attr |= LUDA_IGNORE;
			/*
			 * If the parent is on remote MDT, and there
			 * is no FID-in-dirent, then we have to get
			 * the parent FID from the linkEA.
			 */
			if (!fid_is_sane(fid) &&
			    it->oie_dirent->oied_namelen == 2 &&
			    it->oie_dirent->oied_name[0] == '.' &&
			    it->oie_dirent->oied_name[1] == '.')
				osd_get_pfid_from_linkea(env, obj, fid);
		} else {
			rc = osd_dirent_check_repair(env, obj, it, fid, id,
						     &attr);
		}

		if (!fid_is_sane(fid))
			attr |= LUDA_UNKNOWN;
	} else {
		attr &= ~LU_DIRENT_ATTRS_MASK;
		if (!fid_is_sane(fid)) {
			bool is_dotdot = false;

			if (it->oie_dirent->oied_namelen == 2 &&
			    it->oie_dirent->oied_name[0] == '.' &&
			    it->oie_dirent->oied_name[1] == '.')
				is_dotdot = true;
			/*
			 * If the parent is on remote MDT, and there
			 * is no FID-in-dirent, then we have to get
			 * the parent FID from the linkEA.
			 */
			if (is_remote_parent_ino(dev, ino) && is_dotdot) {
				rc = osd_get_pfid_from_linkea(env, obj, fid);
			} else {
				if (is_dotdot == false &&
				    CFS_FAIL_CHECK(OBD_FAIL_FID_LOOKUP))
					RETURN(-ENOENT);

				rc = osd_ea_fid_get(env, obj, ino, fid, id);
			}
		}
	}

	/* Pack the entry anyway, at least the offset is right. */
	osd_it_pack_dirent(lde, fid, it->oie_dirent->oied_off,
			   it->oie_dirent->oied_name,
			   it->oie_dirent->oied_namelen,
			   it->oie_dirent->oied_type, attr);

	RETURN(rc > 0 ? 0 : rc);
}

/**
 * Returns the record size size at current position.
 *
 * This function will return record(lu_dirent) size in bytes.
 *
 * \param[in] env	execution environment
 * \param[in] di	iterator's in memory structure
 * \param[in] attr	attribute of the entry, only requires LUDA_TYPE to
 *                      calculate the lu_dirent size.
 *
 * \retval	record size(in bytes & in memory) of the current lu_dirent
 *              entry.
 */
static int osd_it_ea_rec_size(const struct lu_env *env, const struct dt_it *di,
			      __u32 attr)
{
	struct osd_it_ea *it = (struct osd_it_ea *)di;

	return lu_dirent_calc_size(it->oie_dirent->oied_namelen, attr);
}

/**
 * Returns a cookie for current position of the iterator head, so that
 * user can use this cookie to load/start the iterator next time.
 *
 * \param di iterator's in memory structure
 *
 * \retval cookie for current position, on success
 */
static __u64 osd_it_ea_store(const struct lu_env *env, const struct dt_it *di)
{
	struct osd_it_ea *it = (struct osd_it_ea *)di;

	return it->oie_dirent->oied_off;
}

/**
 * It calls osd_ldiskfs_it_fill() which will use ->iterate*()
 * to load a directory entry at a time and stored it i inn,
 * in iterator's in-memory data structure.
 *
 * \param di struct osd_it_ea, iterator's in memory structure
 *
 * \retval +ve on success
 * \retval -ve on error
 */
static int osd_it_ea_load(const struct lu_env *env,
			  const struct dt_it *di, __u64 hash)
{
	struct osd_it_ea *it = (struct osd_it_ea *)di;
	int rc;

	ENTRY;
	it->oie_file->f_pos = hash;

	rc =  osd_ldiskfs_it_fill(env, di);
	if (rc > 0)
		rc = -ENODATA;

	if (rc == 0)
		rc = 1;

	RETURN(rc);
}

/**
 * Index lookup function for interoperability mode (b11826).
 *
 * \param key,  key i.e. file name to be searched
 *
 * \retval +ve, on success
 * \retval -ve, on error
 */
static int osd_index_ea_lookup(const struct lu_env *env, struct dt_object *dt,
			       struct dt_rec *rec, const struct dt_key *key)
{
	struct osd_object *obj = osd_dt_obj(dt);
	int rc = 0;

	ENTRY;

	LASSERT(S_ISDIR(obj->oo_inode->i_mode));
	LINVRNT(osd_invariant(obj));

	rc = osd_ea_lookup_rec(env, obj, rec, key);
	if (rc == 0)
		rc = 1;
	RETURN(rc);
}

/**
 * Index and Iterator operations for interoperability
 * mode (i.e. to run 2.0 mds on 1.8 disk) (b11826)
 */
static const struct dt_index_operations osd_index_ea_ops = {
	.dio_lookup         = osd_index_ea_lookup,
	.dio_declare_insert = osd_index_declare_ea_insert,
	.dio_insert         = osd_index_ea_insert,
	.dio_declare_delete = osd_index_declare_ea_delete,
	.dio_delete         = osd_index_ea_delete,
	.dio_it     = {
		.init     = osd_it_ea_init,
		.fini     = osd_it_ea_fini,
		.get      = osd_it_ea_get,
		.put      = osd_it_ea_put,
		.next     = osd_it_ea_next,
		.key      = osd_it_ea_key,
		.key_size = osd_it_ea_key_size,
		.rec      = osd_it_ea_rec,
		.rec_size = osd_it_ea_rec_size,
		.store    = osd_it_ea_store,
		.load     = osd_it_ea_load
	}
};

static void *osd_key_init(const struct lu_context *ctx,
			  struct lu_context_key *key)
{
	struct osd_thread_info *info;

	OBD_ALLOC_PTR(info);
	if (info == NULL)
		return ERR_PTR(-ENOMEM);

	OBD_ALLOC(info->oti_it_ea_buf, OSD_IT_EA_BUFSIZE);
	if (info->oti_it_ea_buf == NULL)
		goto out_free_info;

	info->oti_env = container_of(ctx, struct lu_env, le_ctx);

	info->oti_hlock = ldiskfs_htree_lock_alloc();
	if (info->oti_hlock == NULL)
		goto out_free_ea;

	return info;

out_free_ea:
	OBD_FREE(info->oti_it_ea_buf, OSD_IT_EA_BUFSIZE);
out_free_info:
	OBD_FREE_PTR(info);
	return ERR_PTR(-ENOMEM);
}

static void osd_key_fini(const struct lu_context *ctx,
			 struct lu_context_key *key, void *data)
{
	struct osd_thread_info *info = data;
	struct ldiskfs_inode_info *lli = LDISKFS_I(info->oti_inode);
	struct osd_idmap_cache *idc = info->oti_ins_cache;

	if (info->oti_dio_pages) {
		int i;
		for (i = 0; i < PTLRPC_MAX_BRW_PAGES; i++) {
			struct page *page = info->oti_dio_pages[i];
			if (page) {
				LASSERT(PagePrivate2(page));
				LASSERT(PageLocked(page));
				ClearPagePrivate2(page);
				unlock_page(page);
				__free_page(page);
			}
		}
		OBD_FREE_PTR_ARRAY_LARGE(info->oti_dio_pages,
					 PTLRPC_MAX_BRW_PAGES);
	}

	if (info->oti_inode != NULL)
		OBD_FREE_PTR(lli);
	if (info->oti_hlock != NULL)
		ldiskfs_htree_lock_free(info->oti_hlock);
	OBD_FREE(info->oti_it_ea_buf, OSD_IT_EA_BUFSIZE);
	lu_buf_free(&info->oti_iobuf.dr_pg_buf);
	lu_buf_free(&info->oti_iobuf.dr_bl_buf);
	lu_buf_free(&info->oti_iobuf.dr_lnb_buf);
	lu_buf_free(&info->oti_big_buf);
	if (idc != NULL) {
		LASSERT(info->oti_ins_cache_size > 0);
		OBD_FREE_PTR_ARRAY_LARGE(idc, info->oti_ins_cache_size);
		info->oti_ins_cache = NULL;
		info->oti_ins_cache_size = 0;
	}
	OBD_FREE_PTR(info);
}

static void osd_key_exit(const struct lu_context *ctx,
			 struct lu_context_key *key, void *data)
{
	struct osd_thread_info *info = data;

	LASSERT(info->oti_r_locks == 0);
	LASSERT(info->oti_w_locks == 0);
	LASSERT(info->oti_txns    == 0);
	LASSERTF(info->oti_dio_pages_used == 0, "%d\n",
		 info->oti_dio_pages_used);
}

/* type constructor/destructor: osd_type_init, osd_type_fini */
LU_TYPE_INIT_FINI(osd, &osd_key);

struct lu_context_key osd_key = {
	.lct_tags = LCT_DT_THREAD | LCT_MD_THREAD | LCT_MG_THREAD | LCT_LOCAL,
	.lct_init = osd_key_init,
	.lct_fini = osd_key_fini,
	.lct_exit = osd_key_exit
};


static int osd_device_init(const struct lu_env *env, struct lu_device *d,
			   const char *name, struct lu_device *next)
{
	struct osd_device *osd = osd_dev(d);

	if (strlcpy(osd->od_svname, name, sizeof(osd->od_svname)) >=
	    sizeof(osd->od_svname))
		return -E2BIG;
	return osd_procfs_init(osd, name);
}

static int osd_fid_init(const struct lu_env *env, struct osd_device *osd)
{
	struct seq_server_site *ss = osd_seq_site(osd);
	int rc = 0;

	ENTRY;

	if (osd->od_is_ost || osd->od_cl_seq != NULL)
		RETURN(0);

	if (unlikely(ss == NULL))
		RETURN(-ENODEV);

	OBD_ALLOC_PTR(osd->od_cl_seq);
	if (osd->od_cl_seq == NULL)
		RETURN(-ENOMEM);

	seq_client_init(osd->od_cl_seq, NULL, LUSTRE_SEQ_METADATA,
			osd->od_svname, ss->ss_server_seq);

	if (ss->ss_node_id == 0) {
		/*
		 * If the OSD on the sequence controller(MDT0), then allocate
		 * sequence here, otherwise allocate sequence after connected
		 * to MDT0 (see mdt_register_lwp_callback()).
		 */
		rc = seq_server_alloc_meta(osd->od_cl_seq->lcs_srv,
				   &osd->od_cl_seq->lcs_space, env);
	}

	RETURN(rc);
}

static void osd_fid_fini(const struct lu_env *env, struct osd_device *osd)
{
	if (osd->od_cl_seq == NULL)
		return;

	seq_client_fini(osd->od_cl_seq);
	OBD_FREE_PTR(osd->od_cl_seq);
	osd->od_cl_seq = NULL;
}

static int osd_shutdown(const struct lu_env *env, struct osd_device *o)
{
	ENTRY;

	/* shutdown quota slave instance associated with the device */
	if (o->od_quota_slave_md != NULL) {
		struct qsd_instance *qsd = o->od_quota_slave_md;

		o->od_quota_slave_md = NULL;
		qsd_fini(env, qsd);
	}

	if (o->od_quota_slave_dt != NULL) {
		struct qsd_instance *qsd = o->od_quota_slave_dt;

		o->od_quota_slave_dt = NULL;
		qsd_fini(env, qsd);
	}

	osd_fid_fini(env, o);
	osd_scrub_cleanup(env, o);

	RETURN(0);
}

static void osd_umount(const struct lu_env *env, struct osd_device *o)
{
	ENTRY;

	if (o->od_mnt != NULL) {
		shrink_dcache_sb(osd_sb(o));
		osd_sync(env, &o->od_dt_dev);
		wait_event(o->od_commit_cb_done,
			  !atomic_read(&o->od_commit_cb_in_flight));

		mntput(o->od_mnt);
		o->od_mnt = NULL;
	}

	EXIT;
}

#if LUSTRE_VERSION_CODE < OBD_OCD_VERSION(3, 2, 53, 0)
# ifndef LDISKFS_HAS_INCOMPAT_FEATURE
/* Newer kernels provide the ldiskfs_set_feature_largedir() wrapper already,
 * which calls ldiskfs_update_dynamic_rev() to update ancient filesystems.
 * All ldiskfs filesystems are already v2, so it is a no-op and unnecessary.
 * This avoids maintaining patches to export this otherwise-useless function.
 */
void ldiskfs_update_dynamic_rev(struct super_block *sb)
{
	/* do nothing */
}
# endif
#endif

static int osd_mount(const struct lu_env *env,
		     struct osd_device *o, struct lustre_cfg *cfg)
{
	const char *name = lustre_cfg_string(cfg, 0);
	const char *dev = lustre_cfg_string(cfg, 1);
	const char *opts;
	unsigned long page, s_flags = 0, lmd_flags = 0;
	struct page *__page;
	struct file_system_type *type;
	char *options = NULL;
	const char *str;
	struct osd_thread_info *info = osd_oti_get(env);
	struct lu_fid *fid = &info->oti_fid;
	struct inode *inode;
	int rc = 0, force_over_1024tb = 0;

	ENTRY;

	if (o->od_mnt != NULL)
		RETURN(0);

	if (strlen(dev) >= sizeof(o->od_mntdev))
		RETURN(-E2BIG);
	strcpy(o->od_mntdev, dev);

	str = lustre_cfg_buf(cfg, 2);
	sscanf(str, "%lu:%lu", &s_flags, &lmd_flags);

	opts = lustre_cfg_string(cfg, 3);
#ifdef __BIG_ENDIAN
	if (opts == NULL || strstr(opts, "bigendian_extents") == NULL) {
		CERROR("%s: device %s extents feature is not guaranteed to "
		       "work on big-endian systems. Use \"bigendian_extents\" "
		       "mount option to override.\n", name, dev);
		RETURN(-EINVAL);
	}
#endif
#if LUSTRE_VERSION_CODE < OBD_OCD_VERSION(3, 0, 53, 0)
	if (opts != NULL && strstr(opts, "force_over_128tb") != NULL) {
		CWARN("force_over_128tb option is deprecated.  Filesystems smaller than 1024TB can be created without any force option. Use force_over_1024tb option for filesystems larger than 1024TB.\n");
	}
#endif
#if LUSTRE_VERSION_CODE < OBD_OCD_VERSION(3, 1, 53, 0)
	if (opts != NULL && strstr(opts, "force_over_256tb") != NULL) {
		CWARN("force_over_256tb option is deprecated.  Filesystems smaller than 1024TB can be created without any force options. Use force_over_1024tb option for filesystems larger than 1024TB.\n");
	}
#endif
#if LUSTRE_VERSION_CODE < OBD_OCD_VERSION(3, 2, 53, 0)
	if (opts != NULL && strstr(opts, "force_over_512tb") != NULL) {
		CWARN("force_over_512tb option is deprecated.  Filesystems smaller than 1024TB can be created without any force options. Use force_over_1024tb option for filesystems larger than 1024TB.\n");
	}
#endif

	if (opts != NULL && strstr(opts, "force_over_1024tb") != NULL)
		force_over_1024tb = 1;

	__page = alloc_page(GFP_KERNEL);
	if (__page == NULL)
		GOTO(out, rc = -ENOMEM);
	page = (unsigned long)page_address(__page);
	options = (char *)page;
	*options = '\0';
	if (opts != NULL) {
		/* strip out the options for back compatiblity */
		static const char * const sout[] = {
			"mballoc",
			"iopen",
			"noiopen",
			"iopen_nopriv",
			"extents",
			"noextents",
			/* strip out option we processed in osd */
			"bigendian_extents",
			"force_over_128tb",
			"force_over_256tb",
			"force_over_512tb",
			"force_over_1024tb",
			"resetoi",
			NULL
		};
		strncat(options, opts, PAGE_SIZE);
		for (rc = 0, str = options; sout[rc]; ) {
			char *op = strstr(str, sout[rc]);

			if (op == NULL) {
				rc++;
				str = options;
				continue;
			}
			if (op == options || *(op - 1) == ',') {
				str = op + strlen(sout[rc]);
				if (*str == ',' || *str == '\0') {
					*str == ',' ? str++ : str;
					memmove(op, str, strlen(str) + 1);
				}
			}
			for (str = op; *str != ',' && *str != '\0'; str++)
				;
		}
	} else {
		strncat(options, "user_xattr,acl", PAGE_SIZE);
	}

	/* Glom up mount options */
	if (*options != '\0')
		strncat(options, ",", PAGE_SIZE);
	strncat(options, "no_mbcache,nodelalloc", PAGE_SIZE);

	type = get_fs_type("ldiskfs");
	if (!type) {
		CERROR("%s: cannot find ldiskfs module\n", name);
		GOTO(out, rc = -ENODEV);
	}

	o->od_mnt = vfs_kern_mount(type, s_flags, dev, options);
	module_put(type->owner);

	if (IS_ERR(o->od_mnt)) {
		rc = PTR_ERR(o->od_mnt);
		o->od_mnt = NULL;
		CERROR("%s: can't mount %s: %d\n", name, dev, rc);
		GOTO(out, rc);
	}

	if (ldiskfs_blocks_count(LDISKFS_SB(osd_sb(o))->s_es) <<
				 osd_sb(o)->s_blocksize_bits > 1024ULL << 40 &&
				 force_over_1024tb == 0) {
		CERROR("%s: device %s LDISKFS has not been tested on filesystems larger than 1024TB and may cause data corruption. Use 'force_over_1024tb' mount option to override.\n",
		       name, dev);
		GOTO(out_mnt, rc = -EINVAL);
	}

	if (test_bit(LMD_FLG_DEV_RDONLY, &lmd_flags)) {
		LCONSOLE_WARN("%s: not support dev_rdonly on this device\n",
			      name);

		GOTO(out_mnt, rc = -EOPNOTSUPP);
	}

	if (!ldiskfs_has_feature_journal(o->od_mnt->mnt_sb)) {
		CERROR("%s: device %s is mounted w/o journal\n", name, dev);
		GOTO(out_mnt, rc = -EINVAL);
	}

	if (ldiskfs_has_feature_fast_commit(o->od_mnt->mnt_sb)) {
		CERROR("%s: device %s is mounted with fast_commit that breaks recovery\n",
		       name, dev);
		GOTO(out_mnt, rc = -EOPNOTSUPP);
	}

#if LUSTRE_VERSION_CODE < OBD_OCD_VERSION(3, 2, 53, 0)
#ifdef LDISKFS_MOUNT_DIRDATA
	if (ldiskfs_has_feature_dirdata(o->od_mnt->mnt_sb))
		LDISKFS_SB(osd_sb(o))->s_mount_opt |= LDISKFS_MOUNT_DIRDATA;
	else if (strstr(name, "MDT")) /* don't complain for MGT or OSTs */
		CWARN("%s: device %s was upgraded from Lustre-1.x without "
		      "enabling the dirdata feature. If you do not want to "
		      "downgrade to Lustre-1.x again, you can enable it via "
		      "'tune2fs -O dirdata device'\n", name, dev);
#endif
	/* enable large_dir on MDTs to avoid REMOTE_PARENT_DIR overflow,
	 * and on very large OSTs to avoid object directory overflow */
	if (unlikely(!ldiskfs_has_feature_largedir(o->od_mnt->mnt_sb) &&
		     !strstr(name, "MGS"))) {
		ldiskfs_set_feature_largedir(o->od_mnt->mnt_sb);
		LCONSOLE_INFO("%s: enabled 'large_dir' feature on device %s\n",
			      name, dev);
	}
#endif
	inode = osd_sb(o)->s_root->d_inode;
	lu_local_obj_fid(fid, OSD_FS_ROOT_OID);
	if (!o->od_dt_dev.dd_rdonly) {
		rc = osd_ea_fid_set(info, inode, fid, LMAC_NOT_IN_OI, 0);
		if (rc != 0) {
			CERROR("%s: failed to set lma on %s root inode\n",
			       name, dev);
			GOTO(out_mnt, rc);
		}
	}

	if (test_bit(LMD_FLG_NOSCRUB, &lmd_flags))
		o->od_scrub.os_scrub.os_auto_scrub_interval = AS_NEVER;

	if (blk_queue_nonrot(bdev_get_queue(osd_sb(o)->s_bdev))) {
		/* do not use pagecache with flash-backed storage */
		o->od_writethrough_cache = 0;
		o->od_read_cache = 0;
	}

	GOTO(out, rc = 0);

out_mnt:
	mntput(o->od_mnt);
	o->od_mnt = NULL;

out:
	if (__page)
		__free_page(__page);

	return rc;
}

static struct lu_device *osd_device_fini(const struct lu_env *env,
					 struct lu_device *d)
{
	struct osd_device *o = osd_dev(d);

	ENTRY;

	osd_index_backup(env, o, false);
	osd_shutdown(env, o);
	osd_procfs_fini(o);
	if (o->od_oi_table != NULL)
		osd_oi_fini(osd_oti_get(env), o);
	if (o->od_extent_bytes_percpu)
		free_percpu(o->od_extent_bytes_percpu);
	osd_obj_map_fini(o);
	osd_umount(env, o);

	RETURN(NULL);
}

static int osd_device_init0(const struct lu_env *env,
			    struct osd_device *o,
			    struct lustre_cfg *cfg)
{
	struct lu_device *l = osd2lu_dev(o);
	struct osd_thread_info *info;
	int cplen = 0;
	char *opts = NULL;
	bool restored = false;
	int rc;

	/* if the module was re-loaded, env can loose its keys */
	rc = lu_env_refill((struct lu_env *)env);
	if (rc)
		GOTO(out, rc);
	info = osd_oti_get(env);
	LASSERT(info);

	l->ld_ops = &osd_lu_ops;
	o->od_dt_dev.dd_ops = &osd_dt_ops;

	spin_lock_init(&o->od_osfs_lock);
	mutex_init(&o->od_otable_mutex);
	INIT_LIST_HEAD(&o->od_orphan_list);
	INIT_LIST_HEAD(&o->od_index_backup_list);
	INIT_LIST_HEAD(&o->od_index_restore_list);
	spin_lock_init(&o->od_lock);
	o->od_index_backup_policy = LIBP_NONE;
	o->od_t10_type = 0;
	init_waitqueue_head(&o->od_commit_cb_done);

	o->od_read_cache = 1;
	o->od_writethrough_cache = 1;
	o->od_enable_projid_xattr = 0;
	o->od_readcache_max_filesize = OSD_MAX_CACHE_SIZE;
	o->od_readcache_max_iosize = OSD_READCACHE_MAX_IO_MB << 20;
	o->od_writethrough_max_iosize = OSD_WRITECACHE_MAX_IO_MB << 20;
	o->od_scrub.os_scrub.os_auto_scrub_interval = AS_DEFAULT;
	/* default fallocate to unwritten extents: LU-14326/LU-14333 */
	o->od_fallocate_zero_blocks = 0;

	cplen = strlcpy(o->od_svname, lustre_cfg_string(cfg, 4),
			sizeof(o->od_svname));
	if (cplen >= sizeof(o->od_svname)) {
		rc = -E2BIG;
		GOTO(out, rc);
	}

	o->od_index_backup_stop = 0;
	o->od_index = -1; /* -1 means index is invalid */
	rc = server_name2index(o->od_svname, &o->od_index, NULL);
	if (rc == LDD_F_SV_TYPE_OST)
		o->od_is_ost = 1;

	o->od_full_scrub_ratio = OFSR_DEFAULT;
	o->od_full_scrub_threshold_rate = FULL_SCRUB_THRESHOLD_RATE_DEFAULT;
	rc = osd_mount(env, o, cfg);
	if (rc != 0)
		GOTO(out, rc);

	/* Can only check block device after mount */
	o->od_nonrotational =
		blk_queue_nonrot(bdev_get_queue(osd_sb(o)->s_bdev));

	rc = osd_obj_map_init(env, o);
	if (rc != 0)
		GOTO(out_mnt, rc);

	rc = lu_site_init(&o->od_site, l);
	if (rc != 0)
		GOTO(out_compat, rc);
	o->od_site.ls_bottom_dev = l;

	rc = lu_site_init_finish(&o->od_site);
	if (rc != 0)
		GOTO(out_site, rc);

	opts = lustre_cfg_string(cfg, 3);
	if (opts && strstr(opts, "resetoi"))
		restored = true;

	INIT_LIST_HEAD(&o->od_ios_list);

	rc = lprocfs_init_brw_stats(&o->od_brw_stats);
	if (rc)
		GOTO(out_brw_stats, rc);

	/* setup scrub, including OI files initialization */
	o->od_in_init = 1;
	rc = osd_scrub_setup(env, o, restored);
	o->od_in_init = 0;
	if (rc < 0)
		GOTO(out_brw_stats, rc);

	rc = osd_procfs_init(o, o->od_svname);
	if (rc != 0) {
		CERROR("%s: can't initialize procfs: rc = %d\n",
		       o->od_svname, rc);
		GOTO(out_scrub, rc);
	}

	LASSERT(l->ld_site->ls_linkage.next != NULL);
	LASSERT(l->ld_site->ls_linkage.prev != NULL);

	/* initialize quota slave instance */
	/* currently it's no need to prepare qsd_instance_md for OST */
	if (!o->od_is_ost) {
		o->od_quota_slave_md = qsd_init(env, o->od_svname,
						&o->od_dt_dev, o->od_proc_entry,
						true, true);
		if (IS_ERR(o->od_quota_slave_md)) {
			rc = PTR_ERR(o->od_quota_slave_md);
			o->od_quota_slave_md = NULL;
			GOTO(out_procfs, rc);
		}
	}

	o->od_quota_slave_dt = qsd_init(env, o->od_svname, &o->od_dt_dev,
					o->od_proc_entry, false, true);

	if (IS_ERR(o->od_quota_slave_dt)) {
		if (o->od_quota_slave_md != NULL) {
			qsd_fini(env, o->od_quota_slave_md);
			o->od_quota_slave_md = NULL;
		}

		rc = PTR_ERR(o->od_quota_slave_dt);
		o->od_quota_slave_dt = NULL;
		GOTO(out_procfs, rc);
	}

	o->od_extent_bytes_percpu = alloc_percpu(unsigned int);
	if (!o->od_extent_bytes_percpu) {
		rc = -ENOMEM;
		GOTO(out_procfs, rc);
	}

	RETURN(0);

out_procfs:
	osd_procfs_fini(o);
out_scrub:
	osd_scrub_cleanup(env, o);
out_brw_stats:
	lprocfs_fini_brw_stats(&o->od_brw_stats);
out_site:
	lu_site_fini(&o->od_site);
out_compat:
	osd_obj_map_fini(o);
out_mnt:
	osd_umount(env, o);
out:
	return rc;
}

static struct lu_device *osd_device_alloc(const struct lu_env *env,
					  struct lu_device_type *t,
					  struct lustre_cfg *cfg)
{
	struct osd_device *o;
	int rc;

	OBD_ALLOC_PTR(o);
	if (o == NULL)
		return ERR_PTR(-ENOMEM);

	rc = dt_device_init(&o->od_dt_dev, t);
	if (rc == 0) {
		/*
		 * Because the ctx might be revived in dt_device_init,
		 * refill the env here
		 */
		lu_env_refill((struct lu_env *)env);
		rc = osd_device_init0(env, o, cfg);
		if (rc)
			dt_device_fini(&o->od_dt_dev);
	}

	if (unlikely(rc != 0))
		OBD_FREE_PTR(o);

	return rc == 0 ? osd2lu_dev(o) : ERR_PTR(rc);
}

static struct lu_device *osd_device_free(const struct lu_env *env,
					 struct lu_device *d)
{
	struct osd_device *o = osd_dev(d);

	ENTRY;

	/* XXX: make osd top device in order to release reference */
	d->ld_site->ls_top_dev = d;
	lu_site_purge(env, d->ld_site, -1);
	lu_site_print(env, d->ld_site, &d->ld_site->ls_obj_hash.nelems,
		      D_ERROR, lu_cdebug_printer);
	lu_site_fini(&o->od_site);
	dt_device_fini(&o->od_dt_dev);
	OBD_FREE_PTR(o);
	RETURN(NULL);
}

static int osd_process_config(const struct lu_env *env,
			      struct lu_device *d, struct lustre_cfg *cfg)
{
	struct osd_device *o = osd_dev(d);
	ssize_t count;
	int rc;

	ENTRY;

	switch (cfg->lcfg_command) {
	case LCFG_SETUP:
		rc = osd_mount(env, o, cfg);
		break;
	case LCFG_CLEANUP:
		/*
		 * For the case LCFG_PRE_CLEANUP is not called in advance,
		 * that may happend if hit failure during mount process.
		 */
		osd_index_backup(env, o, false);
		lu_dev_del_linkage(d->ld_site, d);
		rc = osd_shutdown(env, o);
		break;
	case LCFG_PARAM:
		LASSERT(&o->od_dt_dev);
		count  = class_modify_config(cfg, PARAM_OSD,
					     &o->od_dt_dev.dd_kobj);
		if (count < 0)
			count = class_modify_config(cfg, PARAM_OST,
						    &o->od_dt_dev.dd_kobj);
		rc = count > 0 ? 0 : count;
		break;
	case LCFG_PRE_CLEANUP:
		osd_scrub_stop(o);
		osd_index_backup(env, o,
				 o->od_index_backup_policy != LIBP_NONE);
		rc = 0;
		break;
	default:
		rc = -ENOSYS;
	}

	RETURN(rc);
}

static int osd_recovery_complete(const struct lu_env *env,
				 struct lu_device *d)
{
	struct osd_device *osd = osd_dev(d);
	int rc = 0;

	ENTRY;

	if (osd->od_quota_slave_md == NULL && osd->od_quota_slave_dt == NULL)
		RETURN(0);

	/*
	 * start qsd instance on recovery completion, this notifies the quota
	 * slave code that we are about to process new requests now
	 */
	rc = qsd_start(env, osd->od_quota_slave_dt);
	if (rc == 0 && osd->od_quota_slave_md != NULL)
		rc = qsd_start(env, osd->od_quota_slave_md);

	RETURN(rc);
}

/*
 * we use exports to track all osd users
 */
static int osd_obd_connect(const struct lu_env *env, struct obd_export **exp,
			   struct obd_device *obd, struct obd_uuid *cluuid,
			   struct obd_connect_data *data, void *localdata)
{
	struct osd_device *osd = osd_dev(obd->obd_lu_dev);
	struct lustre_handle conn;
	int rc;

	ENTRY;

	CDEBUG(D_CONFIG, "connect #%d\n", osd->od_connects);

	rc = class_connect(&conn, obd, cluuid);
	if (rc)
		RETURN(rc);

	*exp = class_conn2export(&conn);

	spin_lock(&osd->od_osfs_lock);
	osd->od_connects++;
	spin_unlock(&osd->od_osfs_lock);

	RETURN(0);
}

/*
 * once last export (we don't count self-export) disappeared
 * osd can be released
 */
static int osd_obd_disconnect(struct obd_export *exp)
{
	struct obd_device *obd = exp->exp_obd;
	struct osd_device *osd = osd_dev(obd->obd_lu_dev);
	int rc, release = 0;

	ENTRY;

	/* Only disconnect the underlying layers on the final disconnect. */
	spin_lock(&osd->od_osfs_lock);
	osd->od_connects--;
	if (osd->od_connects == 0)
		release = 1;
	spin_unlock(&osd->od_osfs_lock);

	rc = class_disconnect(exp); /* bz 9811 */

	if (rc == 0 && release)
		class_manual_cleanup(obd);
	RETURN(rc);
}

static int osd_prepare(const struct lu_env *env, struct lu_device *pdev,
		       struct lu_device *dev)
{
	struct osd_device *osd = osd_dev(dev);
	struct lr_server_data *lsd =
			&osd->od_dt_dev.dd_lu_dev.ld_site->ls_tgt->lut_lsd;
	int result = 0;

	ENTRY;

	if (osd->od_quota_slave_md != NULL) {
		/* set up quota slave objects for inode */
		result = qsd_prepare(env, osd->od_quota_slave_md);
		if (result != 0)
			RETURN(result);
	}

	if (osd->od_quota_slave_dt != NULL) {
		/* set up quota slave objects for block */
		result = qsd_prepare(env, osd->od_quota_slave_dt);
		if (result != 0)
			RETURN(result);
	}


	if (lsd->lsd_feature_incompat & OBD_COMPAT_OST) {
#if LUSTRE_VERSION_CODE < OBD_OCD_VERSION(3, 0, 52, 0)
		if (lsd->lsd_feature_rocompat & OBD_ROCOMPAT_IDX_IN_IDIF) {
			osd->od_index_in_idif = 1;
		} else {
			osd->od_index_in_idif = 0;
			result = osd_register_proc_index_in_idif(osd);
			if (result != 0)
				RETURN(result);
		}
#else
		osd->od_index_in_idif = 1;
#endif
	}

	result = osd_fid_init(env, osd);

	RETURN(result);
}

/**
 * Implementation of lu_device_operations::ldo_fid_alloc() for OSD
 *
 * Allocate FID.
 *
 * see include/lu_object.h for the details.
 */
static int osd_fid_alloc(const struct lu_env *env, struct lu_device *d,
			 struct lu_fid *fid, struct lu_object *parent,
			 const struct lu_name *name)
{
	struct osd_device *osd = osd_dev(d);

	return seq_client_alloc_fid(env, osd->od_cl_seq, fid);
}

static const struct lu_object_operations osd_lu_obj_ops = {
	.loo_object_init      = osd_object_init,
	.loo_object_delete    = osd_object_delete,
	.loo_object_release   = osd_object_release,
	.loo_object_free      = osd_object_free,
	.loo_object_print     = osd_object_print,
	.loo_object_invariant = osd_object_invariant
};

const struct lu_device_operations osd_lu_ops = {
	.ldo_object_alloc      = osd_object_alloc,
	.ldo_process_config    = osd_process_config,
	.ldo_recovery_complete = osd_recovery_complete,
	.ldo_prepare           = osd_prepare,
	.ldo_fid_alloc	       = osd_fid_alloc,
};

static const struct lu_device_type_operations osd_device_type_ops = {
	.ldto_init = osd_type_init,
	.ldto_fini = osd_type_fini,

	.ldto_start = osd_type_start,
	.ldto_stop  = osd_type_stop,

	.ldto_device_alloc = osd_device_alloc,
	.ldto_device_free  = osd_device_free,

	.ldto_device_init = osd_device_init,
	.ldto_device_fini = osd_device_fini
};

static struct lu_device_type osd_device_type = {
	.ldt_tags     = LU_DEVICE_DT,
	.ldt_name     = LUSTRE_OSD_LDISKFS_NAME,
	.ldt_ops      = &osd_device_type_ops,
	.ldt_ctx_tags = LCT_LOCAL,
};

static int osd_health_check(const struct lu_env *env, struct obd_device *obd)
{
	struct osd_device *osd = osd_dev(obd->obd_lu_dev);
	struct super_block *sb = osd_sb(osd);

	return (osd->od_mnt == NULL || sb->s_flags & SB_RDONLY);
}

/*
 * lprocfs legacy support.
 */
static const struct obd_ops osd_obd_device_ops = {
	.o_owner = THIS_MODULE,
	.o_connect	= osd_obd_connect,
	.o_disconnect	= osd_obd_disconnect,
	.o_health_check = osd_health_check,
};

static ssize_t track_declares_assert_show(struct kobject *kobj,
				   struct attribute *attr,
				   char *buf)
{
	return sprintf(buf, "%d\n", ldiskfs_track_declares_assert);
}

static ssize_t track_declares_assert_store(struct kobject *kobj,
					   struct attribute *attr,
					   const char *buffer, size_t count)
{
	bool track_declares_assert;
	int rc;

	rc = kstrtobool(buffer, &track_declares_assert);
	if (rc)
		return rc;

	ldiskfs_track_declares_assert = track_declares_assert;

	return count;
}
LUSTRE_RW_ATTR(track_declares_assert);

static int __init osd_init(void)
{
	struct kobject *kobj;
	int rc;

	BUILD_BUG_ON(BH_DXLock >=
		     sizeof(((struct buffer_head *)0)->b_state) * 8);
#if !defined(CONFIG_DEBUG_MUTEXES) && !defined(CONFIG_DEBUG_SPINLOCK)
	/* please, try to keep osd_thread_info smaller than a page */
	BUILD_BUG_ON(sizeof(struct osd_thread_info) > PAGE_SIZE);
#endif

	osd_oi_mod_init();

	rc = lu_kmem_init(ldiskfs_caches);
	if (rc)
		return rc;

	rc = class_register_type(&osd_obd_device_ops, NULL, true,
				 LUSTRE_OSD_LDISKFS_NAME, &osd_device_type);
	if (rc) {
		lu_kmem_fini(ldiskfs_caches);
		return rc;
	}

	kobj = kset_find_obj(lustre_kset, LUSTRE_OSD_LDISKFS_NAME);
	if (kobj) {
		rc = sysfs_create_file(kobj,
				       &lustre_attr_track_declares_assert.attr);
		kobject_put(kobj);
		if (rc) {
			CWARN("osd-ldiskfs: track_declares_assert failed to register with sysfs\n");
			rc = 0;
		}
	}

	return rc;
}

static void __exit osd_exit(void)
{
	struct kobject *kobj;

	kobj = kset_find_obj(lustre_kset, LUSTRE_OSD_LDISKFS_NAME);
	if (kobj) {
		sysfs_remove_file(kobj,
				  &lustre_attr_track_declares_assert.attr);
		kobject_put(kobj);
	}
	class_unregister_type(LUSTRE_OSD_LDISKFS_NAME);
	lu_kmem_fini(ldiskfs_caches);
}

MODULE_AUTHOR("OpenSFS, Inc. <http://www.lustre.org/>");
MODULE_DESCRIPTION("Lustre Object Storage Device ("LUSTRE_OSD_LDISKFS_NAME")");
MODULE_VERSION(LUSTRE_VERSION_STRING);
MODULE_LICENSE("GPL");

module_init(osd_init);
module_exit(osd_exit);
