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LU-8510 dne: set osd_obj_ea_ops::dt_invalidate
[fs/lustre-release.git] / lustre / osd-ldiskfs / osd_handler.c
index facf412..c08f11b 100644 (file)
@@ -60,6 +60,7 @@
 
 #include <ldiskfs/ldiskfs.h>
 #include <ldiskfs/xattr.h>
+#include <ldiskfs/ldiskfs_extents.h>
 #undef ENTRY
 /*
  * struct OBD_{ALLOC,FREE}*()
 #include <lustre_linkea.h>
 
 int ldiskfs_pdo = 1;
-CFS_MODULE_PARM(ldiskfs_pdo, "i", int, 0644,
-                "ldiskfs with parallel directory operations");
+module_param(ldiskfs_pdo, int, 0644);
+MODULE_PARM_DESC(ldiskfs_pdo, "ldiskfs with parallel directory operations");
 
 int ldiskfs_track_declares_assert;
-CFS_MODULE_PARM(ldiskfs_track_declares_assert, "i", int, 0644,
-               "LBUG during tracking of declares");
+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;
@@ -175,6 +176,153 @@ static int osd_root_get(const struct lu_env *env,
 }
 
 /*
+ * 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(idc, sizeof(*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(oti->oti_ins_cache,
+                                oti->oti_ins_cache_used * sizeof(*idc));
+               }
+               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;
+
+       /* new mapping is needed */
+       idc = osd_idc_add(env, osd, fid);
+       if (IS_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;
+}
+
+/*
+ * 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) {
+                       LASSERT(idc->oic_lid.oii_ino == 0);
+                       idc->oic_lid.oii_ino = obj->oo_inode->i_ino;
+                       idc->oic_lid.oii_gen = obj->oo_inode->i_generation;
+               }
+               return 0;
+       }
+
+       /* new mapping is needed */
+       idc = osd_idc_add(env, osd, fid);
+       if (IS_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.
  */
 
@@ -199,6 +347,7 @@ static struct lu_object *osd_object_alloc(const struct lu_env *env,
                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;
         } else {
                 return NULL;
@@ -285,6 +434,53 @@ struct inode *osd_iget(struct osd_thread_info *info, struct osd_device *dev,
        return inode;
 }
 
+int osd_ldiskfs_add_entry(struct osd_thread_info *info,
+                         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) {
+               char fidbuf[FID_LEN + 1];
+               struct lustre_mdt_attrs lma;
+               struct lu_fid fid = { };
+               char *errstr;
+               struct dentry *p_dentry = child->d_parent;
+
+               rc2 = osd_get_lma(info, p_dentry->d_inode, p_dentry,
+                                &lma);
+               if (rc2 == 0) {
+                       fid = lma.lma_self_fid;
+                       snprintf(fidbuf, sizeof(fidbuf), DFID, PFID(&fid));
+               } else if (rc2 == -ENODATA) {
+                       if (unlikely(p_dentry->d_inode ==
+                                    inode->i_sb->s_root->d_inode))
+                               lu_local_obj_fid(&fid, OSD_FS_ROOT_OID);
+                       else if (info->oti_dev && !info->oti_dev->od_is_ost &&
+                                fid_seq_is_mdt0(fid_seq(&fid)))
+                               lu_igif_build(&fid, p_dentry->d_inode->i_ino,
+                                             p_dentry->d_inode->i_generation);
+                       snprintf(fidbuf, sizeof(fidbuf), DFID, PFID(&fid));
+               } else {
+                       snprintf(fidbuf, FID_LEN, "%s", "unknown");
+               }
+
+               if (rc == -ENOSPC)
+                       errstr = "has reached";
+               else
+                       errstr = "is approaching";
+               CWARN("%.16s: directory (inode: %lu FID: %s) %s maximum entry limit\n",
+                       LDISKFS_SB(inode->i_sb)->s_es->s_volume_name,
+                       p_dentry->d_inode->i_ino, fidbuf, errstr);
+               /* ignore such error now */
+               if (rc == -ENOBUFS)
+                       rc = 0;
+       }
+       return rc;
+}
+
+
 static struct inode *
 osd_iget_fid(struct osd_thread_info *info, struct osd_device *dev,
             struct osd_inode_id *id, struct lu_fid *fid)
@@ -580,13 +776,15 @@ static int osd_fid_lookup(const struct lu_env *env, struct osd_object *obj,
        struct osd_device      *dev;
        struct osd_idmap_cache *oic;
        struct osd_inode_id    *id;
-       struct inode           *inode;
+       struct inode           *inode = NULL;
        struct osd_scrub       *scrub;
        struct scrub_file      *sf;
-       int                     result;
-       int                     saved  = 0;
-       bool                    cached  = true;
-       bool                    triggered = false;
+       __u32                   flags = SS_CLEAR_DRYRUN | SS_CLEAR_FAILOUT |
+                                       SS_AUTO_FULL;
+       int                     result  = 0;
+       int                     rc1     = 0;
+       bool                    cached  = true;
+       bool                    remote  = false;
        ENTRY;
 
        LINVRNT(osd_invariant(obj));
@@ -600,7 +798,7 @@ static int osd_fid_lookup(const struct lu_env *env, struct osd_object *obj,
        LASSERT(info);
        oic = &info->oti_cache;
 
-       if (OBD_FAIL_CHECK(OBD_FAIL_OST_ENOENT))
+       if (OBD_FAIL_CHECK(OBD_FAIL_SRV_ENOENT))
                RETURN(-ENOENT);
 
        /* For the object is created as locking anchor, or for the object to
@@ -652,27 +850,6 @@ iget:
                if (result == -EREMCHG) {
 
 trigger:
-                       if (unlikely(triggered))
-                               GOTO(out, result = saved);
-
-                       triggered = true;
-                       if (thread_is_running(&scrub->os_thread)) {
-                               result = -EINPROGRESS;
-                       } else if (!dev->od_noscrub) {
-                               result = osd_scrub_start(dev, SS_AUTO_FULL |
-                                       SS_CLEAR_DRYRUN | SS_CLEAR_FAILOUT);
-                               LCONSOLE_WARN("%.16s: trigger OI scrub by RPC "
-                                             "for "DFID", rc = %d [1]\n",
-                                             osd_name(dev), PFID(fid), result);
-                               if (result == 0 || result == -EALREADY)
-                                       result = -EINPROGRESS;
-                               else
-                                       result = -EREMCHG;
-                       }
-
-                       if (fid_is_on_ost(info, dev, fid, OI_CHECK_FLD))
-                               GOTO(out, result);
-
                        /* 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
@@ -688,18 +865,64 @@ trigger:
                         * 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. */
-                       saved = result;
-                       result = osd_lookup_in_remote_parent(info, dev,
-                                                            fid, id);
-                       if (result == 0) {
-                               cached = true;
-                               goto iget;
+                       if (!remote &&
+                           !fid_is_on_ost(info, dev, fid, OI_CHECK_FLD)) {
+                               rc1 = osd_lookup_in_remote_parent(info, dev,
+                                                                 fid, id);
+                               if (rc1 == 0) {
+                                       remote = true;
+                                       cached = true;
+                                       flags |= SS_AUTO_PARTIAL;
+                                       flags &= ~SS_AUTO_FULL;
+                                       goto iget;
+                               }
                        }
 
-                       result = saved;
+                       if (thread_is_running(&scrub->os_thread)) {
+                               if (scrub->os_partial_scan &&
+                                   !scrub->os_in_join) {
+                                       goto join;
+                               } else {
+                                       if (inode != NULL && !IS_ERR(inode)) {
+                                               LASSERT(remote);
+
+                                               osd_add_oi_cache(info, dev, id,
+                                                                fid);
+                                               osd_oii_insert(dev, oic, true);
+                                       } else {
+                                               result = -EINPROGRESS;
+                                       }
+                               }
+                       } else if (!dev->od_noscrub) {
+
+join:
+                               rc1 = osd_scrub_start(dev, flags);
+                               LCONSOLE_WARN("%.16s: trigger OI scrub by RPC "
+                                             "for the "DFID" with flags 0x%x,"
+                                             " rc = %d\n", osd_name(dev),
+                                             PFID(fid), flags, rc1);
+                               if (rc1 == 0 || rc1 == -EALREADY) {
+                                       if (inode != NULL && !IS_ERR(inode)) {
+                                               LASSERT(remote);
+
+                                               osd_add_oi_cache(info, dev, id,
+                                                                fid);
+                                               osd_oii_insert(dev, oic, true);
+                                       } else {
+                                               result = -EINPROGRESS;
+                                       }
+                               } else {
+                                       result = -EREMCHG;
+                               }
+                       } else {
+                               result = -EREMCHG;
+                       }
                }
 
-               GOTO(out, result);
+               if (inode == NULL || IS_ERR(inode))
+                       GOTO(out, result);
+       } else if (remote) {
+               goto trigger;
        }
 
        obj->oo_inode = inode;
@@ -737,6 +960,7 @@ trigger:
                }
 
                iput(inode);
+               inode = NULL;
                obj->oo_inode = NULL;
                if (result != -EREMCHG)
                        GOTO(out, result);
@@ -817,13 +1041,157 @@ static int osd_object_init(const struct lu_env *env, struct lu_object *l,
 
        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)
+       if (result == 0 && obj->oo_inode != NULL) {
+               struct osd_thread_info *oti = osd_oti_get(env);
+               struct lustre_mdt_attrs *lma = &oti->oti_mdt_attrs;
+
                osd_object_init0(obj);
+               result = osd_get_lma(oti, obj->oo_inode,
+                                    &oti->oti_obj_dentry, lma);
+               if (result == 0) {
+                       /* Convert LMAI flags to lustre LMA flags
+                        * and cache it to oo_lma_flags */
+                       obj->oo_lma_flags =
+                               lma_to_lustre_flags(lma->lma_incompat);
+               } else if (result == -ENODATA) {
+                       result = 0;
+               }
+       }
 
        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 struct osd_xattr_entry *osd_oxc_lookup(struct osd_object *obj,
+                                             const char *name,
+                                             size_t namelen)
+{
+       struct osd_xattr_entry *oxe;
+
+       list_for_each_entry(oxe, &obj->oo_xattr_list, oxe_list) {
+               if (namelen == oxe->oxe_namelen &&
+                   strncmp(name, oxe->oxe_buf, namelen) == 0)
+                       return oxe;
+       }
+
+       return NULL;
+}
+
+static int osd_oxc_get(struct osd_object *obj, const char *name,
+                      struct lu_buf *buf)
+{
+       struct osd_xattr_entry *oxe;
+       size_t vallen;
+       ENTRY;
+
+       rcu_read_lock();
+       oxe = osd_oxc_lookup(obj, name, strlen(name));
+       if (oxe == NULL) {
+               rcu_read_unlock();
+               RETURN(-ENOENT);
+       }
+
+       if (!oxe->oxe_exist) {
+               rcu_read_unlock();
+               RETURN(-ENODATA);
+       }
+
+       vallen = oxe->oxe_len - sizeof(*oxe) - oxe->oxe_namelen - 1;
+       LASSERT(vallen > 0);
+
+       if (buf->lb_buf == NULL) {
+               rcu_read_unlock();
+               RETURN(vallen);
+       }
+
+       if (buf->lb_len < vallen) {
+               rcu_read_unlock();
+               RETURN(-ERANGE);
+       }
+
+       memcpy(buf->lb_buf, oxe->oxe_buf + oxe->oxe_namelen + 1, vallen);
+       rcu_read_unlock();
+
+       RETURN(vallen);
+}
+
+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 inline void __osd_oxc_del(struct osd_object *obj, const char *name)
+{
+       struct osd_xattr_entry *oxe;
+
+       oxe = osd_oxc_lookup(obj, name, strlen(name));
+       if (oxe != NULL) {
+               list_del(&oxe->oxe_list);
+               call_rcu(&oxe->oxe_rcu, osd_oxc_free);
+       }
+}
+
+static void osd_oxc_add(struct osd_object *obj, const char *name,
+                       const char *buf, int buflen)
+{
+       struct osd_xattr_entry *oxe;
+       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);
+       __osd_oxc_del(obj, name);
+       list_add_tail(&oxe->oxe_list, &obj->oo_xattr_list);
+       spin_unlock(&obj->oo_guard);
+}
+
+static void osd_oxc_del(struct osd_object *obj, const char *name)
+{
+       spin_lock(&obj->oo_guard);
+       __osd_oxc_del(obj, name);
+       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.
@@ -834,6 +1202,7 @@ static void osd_object_free(const struct lu_env *env, struct lu_object *l)
 
         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);
@@ -1002,6 +1371,11 @@ static void osd_trans_commit_cb(struct super_block *sb,
        OBD_FREE_PTR(oh);
 }
 
+#ifndef HAVE_SB_START_WRITE
+# define sb_start_write(sb) do {} while (0)
+# define sb_end_write(sb) do {} while (0)
+#endif
+
 static struct thandle *osd_trans_create(const struct lu_env *env,
                                        struct dt_device *d)
 {
@@ -1014,7 +1388,8 @@ static struct thandle *osd_trans_create(const struct lu_env *env,
        /* on pending IO in this thread should left from prev. request */
        LASSERT(atomic_read(&iobuf->dr_numreqs) == 0);
 
-       th = ERR_PTR(-ENOMEM);
+       sb_start_write(osd_sb(osd_dt_dev(d)));
+
        OBD_ALLOC_GFP(oh, sizeof *oh, GFP_NOFS);
        if (oh != NULL) {
                oh->ot_quota_trans = &oti->oti_quota_trans;
@@ -1034,6 +1409,9 @@ static struct thandle *osd_trans_create(const struct lu_env *env,
                       sizeof(oti->oti_declare_ops_cred));
                memset(oti->oti_declare_ops_used, 0,
                       sizeof(oti->oti_declare_ops_used));
+       } else {
+               sb_end_write(osd_sb(osd_dt_dev(d)));
+               th = ERR_PTR(-ENOMEM);
        }
        RETURN(th);
 }
@@ -1114,16 +1492,13 @@ static int osd_trans_start(const struct lu_env *env, struct dt_device *d,
                static unsigned long last_printed;
                static int last_credits;
 
-               CWARN("%.16s: too many transaction credits (%d > %d)\n",
-                     LDISKFS_SB(osd_sb(dev))->s_es->s_volume_name,
-                     oh->ot_credits,
-                     osd_journal(dev)->j_max_transaction_buffers);
-
-               osd_trans_dump_creds(env, th);
-
+               /* 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 +
-                              msecs_to_jiffies(60 * MSEC_PER_SEC))) {
+                              msecs_to_jiffies(60 * MSEC_PER_SEC)) &&
+                   osd_transaction_size(dev) > 512) {
+                       osd_trans_dump_creds(env, th);
                        libcfs_debug_dumpstack(NULL);
                        last_credits = oh->ot_credits;
                        last_printed = jiffies;
@@ -1216,6 +1591,9 @@ static int osd_trans_stop(const struct lu_env *env, struct dt_device *dt,
 
        oh = container_of0(th, struct osd_thandle, ot_super);
 
+       /* reset OI cache for safety */
+       oti->oti_ins_cache_used = 0;
+
        remove_agents = oh->ot_remove_agents;
 
        qtrans = oh->ot_quota_trans;
@@ -1275,6 +1653,8 @@ static int osd_trans_stop(const struct lu_env *env, struct dt_device *dt,
        if (unlikely(remove_agents != 0))
                osd_process_scheduled_agent_removals(env, osd);
 
+       sb_end_write(osd_sb(osd));
+
        RETURN(rc);
 }
 
@@ -1340,6 +1720,12 @@ static void osd_object_delete(const struct lu_env *env, struct lu_object *l)
 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 */
+       if (unlikely(!o->oo_destroyed && o->oo_inode && o->oo_inode->i_nlink == 0))
+               LBUG();
 }
 
 /*
@@ -1363,18 +1749,17 @@ static int osd_object_print(const struct lu_env *env, void *cookie,
                     d ? d->id_ops->id_name : "plain");
 }
 
-#define GRANT_FOR_LOCAL_OIDS 32 /* 128kB for last_rcvd, quota files, ... */
-
 /*
  * Concurrency: shouldn't matter.
  */
 int osd_statfs(const struct lu_env *env, struct dt_device *d,
                struct obd_statfs *sfs)
 {
-        struct osd_device  *osd = osd_dt_dev(d);
-        struct super_block *sb = osd_sb(osd);
-        struct kstatfs     *ksfs;
-        int result = 0;
+       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;
@@ -1388,34 +1773,40 @@ int osd_statfs(const struct lu_env *env, struct dt_device *d,
                 ksfs = &osd_oti_get(env)->oti_ksfs;
         }
 
-       spin_lock(&osd->od_osfs_lock);
        result = sb->s_op->statfs(sb->s_root, ksfs);
-       if (likely(result == 0)) { /* N.B. statfs can't really fail */
-               statfs_pack(sfs, ksfs);
-               if (unlikely(sb->s_flags & MS_RDONLY))
-                       sfs->os_state = OS_STATE_READONLY;
-               if (LDISKFS_HAS_INCOMPAT_FEATURE(sb,
-                                             LDISKFS_FEATURE_INCOMPAT_EXTENTS))
-                       sfs->os_maxbytes = sb->s_maxbytes;
-               else
-                       sfs->os_maxbytes = LDISKFS_SB(sb)->s_bitmap_maxbytes;
-       }
-       spin_unlock(&osd->od_osfs_lock);
+       if (result)
+               goto out;
+
+       statfs_pack(sfs, ksfs);
+       if (unlikely(sb->s_flags & MS_RDONLY))
+               sfs->os_state = OS_STATE_READONLY;
+       if (LDISKFS_HAS_INCOMPAT_FEATURE(sb,
+                                        LDISKFS_FEATURE_INCOMPAT_EXTENTS))
+               sfs->os_maxbytes = sb->s_maxbytes;
+       else
+               sfs->os_maxbytes = LDISKFS_SB(sb)->s_bitmap_maxbytes;
 
-       if (unlikely(env == NULL))
-                OBD_FREE_PTR(ksfs);
+       /*
+        * 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.
+        */
+       CLASSERT(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;
 
-       /* Reserve a small amount of space for local objects like last_rcvd,
-        * llog, quota files, ... */
-       if (sfs->os_bavail <= GRANT_FOR_LOCAL_OIDS) {
-               sfs->os_bavail = 0;
-       } else {
-               sfs->os_bavail -= GRANT_FOR_LOCAL_OIDS;
-               /** Take out metadata overhead for indirect blocks */
-               sfs->os_bavail -= sfs->os_bavail >> (sb->s_blocksize_bits - 3);
-       }
+       sfs->os_blocks -= reserved;
+       sfs->os_bfree  -= min(reserved, sfs->os_bfree);
+       sfs->os_bavail -= min(reserved, sfs->os_bavail);
 
-        return result;
+out:
+       if (unlikely(env == NULL))
+               OBD_FREE_PTR(ksfs);
+       return result;
 }
 
 /**
@@ -1444,21 +1835,23 @@ static void osd_conf_get(const struct lu_env *env,
          */
         param->ddp_max_name_len = LDISKFS_NAME_LEN;
         param->ddp_max_nlink    = LDISKFS_LINK_MAX;
-       param->ddp_block_shift  = sb->s_blocksize_bits;
+       param->ddp_symlink_max  = sb->s_blocksize;
        param->ddp_mount_type     = LDD_MT_LDISKFS;
        if (LDISKFS_HAS_INCOMPAT_FEATURE(sb, LDISKFS_FEATURE_INCOMPAT_EXTENTS))
                param->ddp_maxbytes = sb->s_maxbytes;
        else
                param->ddp_maxbytes = LDISKFS_SB(sb)->s_bitmap_maxbytes;
-       /* Overhead estimate should be fairly accurate, so we really take a tiny
-        * error margin which also avoids fragmenting the filesystem too much */
-       param->ddp_grant_reserved = 2; /* end up to be 1.9% after conversion */
        /* inode are statically allocated, so per-inode space consumption
         * is the space consumed by the directory entry */
        param->ddp_inodespace     = PER_OBJ_USAGE;
-       /* per-fragment overhead to be used by the client code */
-       param->ddp_grant_frag     = 6 * LDISKFS_BLOCK_SIZE(sb);
-        param->ddp_mntopts      = 0;
+       /* EXT_INIT_MAX_LEN is the theoretical maximum extent size  (32k blocks
+        * = 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. */
+       param->ddp_max_extent_blks = EXT_INIT_MAX_LEN >> 2;
+       /* 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))
@@ -1537,6 +1930,12 @@ static int osd_ro(const struct lu_env *env, struct dt_device *d)
 #ifdef HAVE_DEV_SET_RDONLY
        CERROR("*** setting %s read-only ***\n", osd_dt_dev(d)->od_svname);
 
+       if (sb->s_op->freeze_fs) {
+               rc = sb->s_op->freeze_fs(sb);
+               if (rc)
+                       goto out;
+       }
+
        if (jdev && (jdev != dev)) {
                CDEBUG(D_IOCTL | D_HA, "set journal dev %lx rdonly\n",
                       (long)jdev);
@@ -1544,10 +1943,16 @@ static int osd_ro(const struct lu_env *env, struct dt_device *d)
        }
        CDEBUG(D_IOCTL | D_HA, "set dev %lx rdonly\n", (long)dev);
        dev_set_rdonly(dev);
-#else
-       CERROR("%s: %lx CANNOT BE SET READONLY: rc = %d\n",
-              osd_dt_dev(d)->od_svname, (long)dev, rc);
+
+       if (sb->s_op->unfreeze_fs)
+               sb->s_op->unfreeze_fs(sb);
+
+out:
 #endif
+       if (rc)
+               CERROR("%s: %lx CANNOT BE SET READONLY: rc = %d\n",
+                      osd_dt_dev(d)->od_svname, (long)dev, rc);
+
        RETURN(rc);
 }
 
@@ -1703,7 +2108,6 @@ static struct timespec *osd_inode_time(const struct lu_env *env,
        return t;
 }
 
-
 static void osd_inode_getattr(const struct lu_env *env,
                              struct inode *inode, struct lu_attr *attr)
 {
@@ -1720,7 +2124,7 @@ static void osd_inode_getattr(const struct lu_env *env,
        attr->la_blocks  = inode->i_blocks;
        attr->la_uid     = i_uid_read(inode);
        attr->la_gid     = i_gid_read(inode);
-       attr->la_flags   = LDISKFS_I(inode)->i_flags;
+       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;
@@ -1733,7 +2137,9 @@ static int osd_attr_get(const struct lu_env *env,
 {
        struct osd_object *obj = osd_dt_obj(dt);
 
-       if (!dt_object_exists(dt))
+       if (unlikely(!dt_object_exists(dt)))
+               return -ENOENT;
+       if (unlikely(obj->oo_destroyed))
                return -ENOENT;
 
        LASSERT(!dt_object_remote(dt));
@@ -1741,7 +2147,10 @@ static int osd_attr_get(const struct lu_env *env,
 
        spin_lock(&obj->oo_guard);
        osd_inode_getattr(env, obj->oo_inode, attr);
+       if (obj->oo_lma_flags & LUSTRE_ORPHAN_FL)
+               attr->la_flags |= LUSTRE_ORPHAN_FL;
        spin_unlock(&obj->oo_guard);
+
        return 0;
 }
 
@@ -1773,6 +2182,9 @@ static int osd_declare_attr_set(const struct lu_env *env,
        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);
 
@@ -1901,23 +2313,19 @@ static int osd_inode_setattr(const struct lu_env *env,
        if (bits == 0)
                return 0;
 
-        if (bits & LA_ATIME)
-                inode->i_atime  = *osd_inode_time(env, inode, attr->la_atime);
-        if (bits & LA_CTIME)
-                inode->i_ctime  = *osd_inode_time(env, inode, attr->la_ctime);
-        if (bits & LA_MTIME)
-                inode->i_mtime  = *osd_inode_time(env, inode, attr->la_mtime);
-        if (bits & LA_SIZE) {
-                LDISKFS_I(inode)->i_disksize = attr->la_size;
-                i_size_write(inode, attr->la_size);
-        }
+       if (bits & LA_ATIME)
+               inode->i_atime  = *osd_inode_time(env, inode, attr->la_atime);
+       if (bits & LA_CTIME)
+               inode->i_ctime  = *osd_inode_time(env, inode, attr->la_ctime);
+       if (bits & LA_MTIME)
+               inode->i_mtime  = *osd_inode_time(env, inode, attr->la_mtime);
+       if (bits & LA_SIZE) {
+               LDISKFS_I(inode)->i_disksize = attr->la_size;
+               i_size_write(inode, attr->la_size);
+       }
 
-#if 0
-        /* OSD should not change "i_blocks" which is used by quota.
-         * "i_blocks" should be changed by ldiskfs only. */
-        if (bits & LA_BLOCKS)
-                inode->i_blocks = attr->la_blocks;
-#endif
+       /* 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);
@@ -1930,12 +2338,12 @@ static int osd_inode_setattr(const struct lu_env *env,
        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;
-        }
-        return 0;
+       if (bits & LA_FLAGS) {
+               /* always keep S_NOCMTIME */
+               inode->i_flags = ll_ext_to_inode_flags(attr->la_flags) |
+                                S_NOCMTIME;
+       }
+       return 0;
 }
 
 static int osd_quota_transfer(struct inode *inode, const struct lu_attr *attr)
@@ -2017,10 +2425,41 @@ static int osd_attr_set(const struct lu_env *env,
        spin_lock(&obj->oo_guard);
        rc = osd_inode_setattr(env, inode, attr);
        spin_unlock(&obj->oo_guard);
+       if (rc != 0)
+               GOTO(out, rc);
 
-        if (!rc)
-               ll_dirty_inode(inode, I_DIRTY_DATASYNC);
+       ll_dirty_inode(inode, I_DIRTY_DATASYNC);
 
+       if (!(attr->la_valid & LA_FLAGS))
+               GOTO(out, rc);
+
+       /* Let's check if there are extra flags need to be set into LMA */
+       if (attr->la_flags & LUSTRE_LMA_FL_MASKS) {
+               struct osd_thread_info *info = osd_oti_get(env);
+               struct lustre_mdt_attrs *lma = &info->oti_mdt_attrs;
+
+               rc = osd_get_lma(info, inode, &info->oti_obj_dentry, lma);
+               if (rc != 0)
+                       GOTO(out, rc);
+
+               lma->lma_incompat |=
+                       lustre_to_lma_flags(attr->la_flags);
+               lustre_lma_swab(lma);
+               rc = __osd_xattr_set(info, inode, XATTR_NAME_LMA,
+                                    lma, sizeof(*lma), XATTR_REPLACE);
+               if (rc != 0) {
+                       struct osd_device *osd = osd_obj2dev(obj);
+
+                       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:
        osd_trans_exec_check(env, handle, OSD_OT_ATTR_SET);
 
         return rc;
@@ -2238,6 +2677,12 @@ static void osd_ah_init(const struct lu_env *env, struct dt_allocation_hint *ah,
 
         ah->dah_parent = parent;
         ah->dah_mode = child_mode;
+
+       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,
@@ -2262,20 +2707,20 @@ static void osd_attr_init(struct osd_thread_info *info, struct osd_object *obj,
        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).
-                 */
+       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);
                ll_dirty_inode(inode, I_DIRTY_DATASYNC);
-        }
+       }
 
-        attr->la_valid = valid;
+       attr->la_valid = valid;
 }
 
 /**
@@ -2342,7 +2787,8 @@ static int __osd_oi_insert(const struct lu_env *env, struct osd_object *obj,
        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);
+       rc = osd_oi_insert(info, osd, fid, id, oh->ot_handle,
+                          OI_CHECK_FLD, NULL);
        osd_trans_exec_check(env, th, OSD_OT_INSERT);
 
        return rc;
@@ -2413,6 +2859,10 @@ static int osd_declare_object_create(const struct lu_env *env,
        if (rc != 0)
                RETURN(rc);
 
+       /* 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));
+
        RETURN(rc);
 }
 
@@ -2488,6 +2938,13 @@ static int osd_declare_object_destroy(const struct lu_env *env,
        /* data to be truncated */
        rc = osd_declare_inode_qid(env, i_uid_read(inode), i_gid_read(inode),
                                   0, oh, obj, true, NULL, false);
+       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);
 }
 
@@ -2835,7 +3292,7 @@ static int osd_object_ea_create(const struct lu_env *env, struct dt_object *dt,
        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;
+       int                      result, on_ost = 0;
 
        ENTRY;
 
@@ -2861,13 +3318,15 @@ static int osd_object_ea_create(const struct lu_env *env, struct dt_object *dt,
 
                        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,
-                               fid_is_on_ost(info, osd_obj2dev(obj),
-                                             fid, OI_CHECK_FLD) ?
-                               LMAC_FID_ON_OST : 0, 0);
+                                               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;
@@ -2876,6 +3335,15 @@ static int osd_object_ea_create(const struct lu_env *env, struct dt_object *dt,
        if (result == 0)
                result = __osd_oi_insert(env, obj, fid, th);
 
+       /* 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));
@@ -2911,7 +3379,7 @@ static int osd_object_ref_add(const struct lu_env *env,
        struct osd_thandle *oh;
        int                 rc = 0;
 
-       if (!dt_object_exists(dt))
+       if (!dt_object_exists(dt) || obj->oo_destroyed)
                return -ENOENT;
 
        LINVRNT(osd_invariant(obj));
@@ -3048,15 +3516,17 @@ static int osd_object_version_get(const struct lu_env *env,
 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;
+       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;
 
-        /* version get is not real XATTR but uses xattr API */
-        if (strcmp(name, XATTR_NAME_VERSION) == 0) {
-                /* for version we are just using xattr API but change inode
-                 * field instead */
+       /* version get is not real XATTR but uses xattr API */
+       if (strcmp(name, XATTR_NAME_VERSION) == 0) {
+               /* for version we are just using xattr API but change inode
+                * field instead */
                if (buf->lb_len == 0)
                        return sizeof(dt_obj_version_t);
 
@@ -3066,7 +3536,7 @@ static int osd_xattr_get(const struct lu_env *env, struct dt_object *dt,
                osd_object_version_get(env, dt, buf->lb_buf);
 
                return sizeof(dt_obj_version_t);
-        }
+       }
 
        if (!dt_object_exists(dt))
                return -ENOENT;
@@ -3075,9 +3545,26 @@ static int osd_xattr_get(const struct lu_env *env, struct dt_object *dt,
        LASSERT(inode->i_op != NULL);
        LASSERT(inode->i_op->getxattr != NULL);
 
-       return __osd_xattr_get(inode, dentry, name, buf->lb_buf, buf->lb_len);
-}
+       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;
+       }
 
+       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,
@@ -3176,16 +3663,16 @@ static int osd_xattr_set(const struct lu_env *env, struct dt_object *dt,
        int                     rc;
        ENTRY;
 
-        LASSERT(handle != NULL);
+       LASSERT(handle != NULL);
 
-        /* version set is not real XATTR */
-        if (strcmp(name, XATTR_NAME_VERSION) == 0) {
-                /* for version we are just using xattr API but change inode
-                 * field instead */
-                LASSERT(buf->lb_len == sizeof(dt_obj_version_t));
-                osd_object_version_set(env, dt, buf->lb_buf);
-                return sizeof(dt_obj_version_t);
-        }
+       /* version set is not real XATTR */
+       if (strcmp(name, XATTR_NAME_VERSION) == 0) {
+               /* for version we are just using xattr API but change inode
+                * field instead */
+               LASSERT(buf->lb_len == sizeof(dt_obj_version_t));
+               osd_object_version_set(env, dt, buf->lb_buf);
+               return sizeof(dt_obj_version_t);
+       }
 
        CDEBUG(D_INODE, DFID" set xattr '%s' with size %zu\n",
               PFID(lu_object_fid(&dt->do_lu)), name, buf->lb_len);
@@ -3221,6 +3708,11 @@ static int osd_xattr_set(const struct lu_env *env, struct dt_object *dt,
                               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;
 }
 
@@ -3298,6 +3790,12 @@ static int osd_xattr_del(const struct lu_env *env, struct dt_object *dt,
        dentry->d_sb = inode->i_sb;
        rc = inode->i_op->removexattr(dentry, 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;
 }
 
@@ -3325,6 +3823,11 @@ static int osd_object_sync(const struct lu_env *env, struct dt_object *dt,
        RETURN(rc);
 }
 
+static int osd_invalidate(const struct lu_env *env, struct dt_object *dt)
+{
+       return 0;
+}
+
 /*
  * Index operations.
  */
@@ -3397,7 +3900,7 @@ static int osd_index_try(const struct lu_env *env, struct dt_object *dt,
                 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))
+               if (obj->oo_inode == NULL || S_ISDIR(obj->oo_inode->i_mode))
                         result = 0;
                 else
                         result = -ENOTDIR;
@@ -3492,6 +3995,7 @@ static const struct dt_object_operations osd_obj_ops = {
         .do_xattr_del         = osd_xattr_del,
         .do_xattr_list        = osd_xattr_list,
         .do_object_sync       = osd_object_sync,
+       .do_invalidate        = osd_invalidate,
 };
 
 /**
@@ -3524,6 +4028,7 @@ static const struct dt_object_operations osd_obj_ea_ops = {
         .do_xattr_del         = osd_xattr_del,
         .do_xattr_list        = osd_xattr_list,
         .do_object_sync       = osd_object_sync,
+       .do_invalidate        = osd_invalidate,
 };
 
 static const struct dt_object_operations osd_obj_otable_it_ops = {
@@ -3721,7 +4226,7 @@ static int osd_index_ea_delete(const struct lu_env *env, struct dt_object *dt,
         }
 
         bh = osd_ldiskfs_find_entry(dir, &dentry->d_name, &de, NULL, hlock);
-        if (bh) {
+       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.
@@ -3750,11 +4255,11 @@ static int osd_index_ea_delete(const struct lu_env *env, struct dt_object *dt,
                                                le32_to_cpu(de->inode));
                        }
                }
-                rc = ldiskfs_delete_entry(oh->ot_handle, dir, de, bh);
-                brelse(bh);
-        } else {
-                rc = -ENOENT;
-        }
+               rc = ldiskfs_delete_entry(oh->ot_handle, dir, de, bh);
+               brelse(bh);
+       } else {
+               rc = PTR_ERR(bh);
+       }
         if (hlock != NULL)
                 ldiskfs_htree_unlock(hlock);
         else
@@ -3971,7 +4476,8 @@ static int __osd_ea_add_rec(struct osd_thread_info *info,
        child = osd_child_dentry_get(info->oti_env, pobj, name, strlen(name));
        child->d_fsdata = (void *)ldp;
        ll_vfs_dq_init(pobj->oo_inode);
-       rc = osd_ldiskfs_add_entry(oth->ot_handle, child, cinode, hlock);
+       rc = osd_ldiskfs_add_entry(info, oth->ot_handle, child,
+                                  cinode, hlock);
        if (rc == 0 && OBD_FAIL_CHECK(OBD_FAIL_LFSCK_BAD_TYPE)) {
                struct ldiskfs_dir_entry_2      *de;
                struct buffer_head              *bh;
@@ -3979,7 +4485,7 @@ static int __osd_ea_add_rec(struct osd_thread_info *info,
 
                bh = osd_ldiskfs_find_entry(pobj->oo_inode, &child->d_name, &de,
                                            NULL, hlock);
-               if (bh != NULL) {
+               if (!IS_ERR(bh)) {
                        rc1 = ldiskfs_journal_get_write_access(oth->ot_handle,
                                                               bh);
                        if (rc1 == 0) {
@@ -3991,8 +4497,8 @@ static int __osd_ea_add_rec(struct osd_thread_info *info,
                                                        LDISKFS_FT_DIR;
                                ldiskfs_handle_dirty_metadata(oth->ot_handle,
                                                              NULL, bh);
-                               brelse(bh);
                        }
+                       brelse(bh);
                }
        }
 
@@ -4030,7 +4536,7 @@ static int osd_add_dot_dotdot(struct osd_thread_info *info,
                 if (dir->oo_compat_dot_created) {
                         result = -EEXIST;
                 } else {
-                        LASSERT(inode == parent_dir);
+                       LASSERT(inode->i_ino == parent_dir->i_ino);
                         dir->oo_compat_dot_created = 1;
                         result = 0;
                 }
@@ -4337,7 +4843,7 @@ static int osd_ea_lookup_rec(const struct lu_env *env, struct osd_object *obj,
        }
 
        bh = osd_ldiskfs_find_entry(dir, &dentry->d_name, &de, NULL, hlock);
-       if (bh) {
+       if (!IS_ERR(bh)) {
                struct osd_thread_info *oti = osd_oti_get(env);
                struct osd_inode_id *id = &oti->oti_id;
                struct osd_idmap_cache *oic = &oti->oti_cache;
@@ -4383,7 +4889,7 @@ static int osd_ea_lookup_rec(const struct lu_env *env, struct osd_object *obj,
                if (rc != 0)
                        fid_zero(&oic->oic_fid);
        } else {
-               rc = -ENOENT;
+               rc = PTR_ERR(bh);
        }
 
        GOTO(out, rc);
@@ -4397,65 +4903,6 @@ out:
 }
 
 /**
- * Find the osd object for given fid.
- *
- * \param fid need to find the osd object having this fid
- *
- * \retval osd_object on success
- * \retval        -ve on error
- */
-static struct osd_object *osd_object_find(const struct lu_env *env,
-                                         struct dt_object *dt,
-                                         const struct lu_fid *fid)
-{
-        struct lu_device  *ludev = dt->do_lu.lo_dev;
-        struct osd_object *child = NULL;
-        struct lu_object  *luch;
-        struct lu_object  *lo;
-
-       /*
-        * at this point topdev might not exist yet
-        * (i.e. MGS is preparing profiles). so we can
-        * not rely on topdev and instead lookup with
-        * our device passed as topdev. this can't work
-        * if the object isn't cached yet (as osd doesn't
-        * allocate lu_header). IOW, the object must be
-        * in the cache, otherwise lu_object_alloc() crashes
-        * -bzzz
-        */
-       luch = lu_object_find_at(env, ludev->ld_site->ls_top_dev == NULL ?
-                                ludev : ludev->ld_site->ls_top_dev,
-                                fid, NULL);
-       if (!IS_ERR(luch)) {
-               if (lu_object_exists(luch)) {
-                       lo = lu_object_locate(luch->lo_header, ludev->ld_type);
-                       if (lo != NULL)
-                               child = osd_obj(lo);
-                       else
-                               LU_OBJECT_DEBUG(D_ERROR, env, luch,
-                                               "lu_object can't be located"
-                                               DFID"\n", PFID(fid));
-
-                        if (child == NULL) {
-                                lu_object_put(env, luch);
-                                CERROR("Unable to get osd_object\n");
-                                child = ERR_PTR(-ENOENT);
-                        }
-                } else {
-                        LU_OBJECT_DEBUG(D_ERROR, env, luch,
-                                        "lu_object does not exists "DFID"\n",
-                                        PFID(fid));
-                       lu_object_put(env, luch);
-                        child = ERR_PTR(-ENOENT);
-                }
-       } else {
-               child = ERR_CAST(luch);
-       }
-
-       return child;
-}
-
-/**
  * Put the osd object once done with it.
  *
  * \param obj osd object that needs to be put
@@ -4474,28 +4921,34 @@ static int osd_index_declare_ea_insert(const struct lu_env *env,
 {
        struct osd_thandle      *oh;
        struct osd_device       *osd   = osd_dev(dt->do_lu.lo_dev);
-       struct lu_fid           *fid = (struct lu_fid *)rec;
+       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_of0(handle, struct osd_thandle, ot_super);
        LASSERT(oh->ot_handle == NULL);
 
        credits = osd_dto_credits_noquota[DTO_INDEX_INSERT];
-       if (fid != NULL) {
-               rc = osd_remote_fid(env, osd, fid);
-               if (unlikely(rc < 0))
-                       RETURN(rc);
-               if (rc > 0) {
-                       /* 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];
-               }
-               rc = 0;
+
+       /* 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);
@@ -4536,9 +4989,8 @@ static int osd_index_ea_insert(const struct lu_env *env, struct dt_object *dt,
        const struct lu_fid     *fid    = rec1->rec_fid;
        const char              *name = (const char *)key;
        struct osd_thread_info  *oti   = osd_oti_get(env);
-       struct osd_inode_id     *id    = &oti->oti_id;
        struct inode            *child_inode = NULL;
-       struct osd_object       *child = NULL;
+       struct osd_idmap_cache  *idc;
        int                     rc;
        ENTRY;
 
@@ -4553,14 +5005,22 @@ static int osd_index_ea_insert(const struct lu_env *env, struct dt_object *dt,
 
        LASSERTF(fid_is_sane(fid), "fid"DFID" is insane!\n", PFID(fid));
 
-       rc = osd_remote_fid(env, osd, fid);
-       if (rc < 0) {
-               CERROR("%s: Can not find object "DFID" rc %d\n",
-                      osd_name(osd), PFID(fid), rc);
-               RETURN(rc);
+       idc = osd_idc_find(env, osd, fid);
+       if (unlikely(idc == NULL)) {
+               /* 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 */
+               CERROR("%s: "DFID" wasn't declared for insert\n",
+                      osd_name(osd), PFID(fid));
+               dump_stack();
+               idc = osd_idc_find_or_init(env, osd, fid);
+               if (IS_ERR(idc))
+                       RETURN(PTR_ERR(idc));
        }
 
-       if (rc == 1) {
+       if (idc->oic_remote) {
                /* Insert remote entry */
                if (strcmp(name, dotdot) == 0 && strlen(name) == 2) {
                        struct osd_mdobj_map    *omm = osd->od_mdt_map;
@@ -4586,15 +5046,23 @@ static int osd_index_ea_insert(const struct lu_env *env, struct dt_object *dt,
                }
        } else {
                /* Insert local entry */
-               child = osd_object_find(env, dt, fid);
-               if (IS_ERR(child)) {
-                       CERROR("%s: Can not find object "DFID"%u:%u: rc = %d\n",
-                              osd_name(osd), PFID(fid),
-                              id->oii_ino, id->oii_gen,
-                              (int)PTR_ERR(child));
-                       RETURN(PTR_ERR(child));
+               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 = igrab(child->oo_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);
@@ -4602,9 +5070,8 @@ static int osd_index_ea_insert(const struct lu_env *env, struct dt_object *dt,
        CDEBUG(D_INODE, "parent %lu insert %s:%lu rc = %d\n",
               obj->oo_inode->i_ino, name, child_inode->i_ino, rc);
 
-       iput(child_inode);
-       if (child != NULL)
-               osd_object_put(env, child);
+       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);
@@ -5020,11 +5487,17 @@ struct osd_filldir_cbs {
  * \retval 0 on success
  * \retval 1 on buffer full
  */
+#ifdef HAVE_FILLDIR_USE_CTX
+static int osd_ldiskfs_filldir(struct dir_context  *buf,
+                              const char *name, int namelen,
+#else
 static int osd_ldiskfs_filldir(void *buf, const char *name, int namelen,
+#endif
                                loff_t offset, __u64 ino,
                                unsigned d_type)
 {
-       struct osd_it_ea        *it   = ((struct osd_filldir_cbs *)buf)->it;
+       struct osd_it_ea        *it   =
+               ((struct osd_filldir_cbs *)buf)->it;
        struct osd_object       *obj  = it->oie_obj;
         struct osd_it_ea_dirent *ent  = it->oie_dirent;
         struct lu_fid           *fid  = &ent->oied_fid;
@@ -5239,6 +5712,7 @@ osd_dirent_reinsert(const struct lu_env *env, handle_t *jh,
        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_INCOMPAT_FEATURE(inode->i_sb,
@@ -5272,7 +5746,7 @@ osd_dirent_reinsert(const struct lu_env *env, handle_t *jh,
        osd_get_ldiskfs_dirent_param(ldp, fid);
        dentry->d_fsdata = (void *)ldp;
        ll_vfs_dq_init(dir);
-       rc = osd_ldiskfs_add_entry(jh, dentry, inode, hlock);
+       rc = osd_ldiskfs_add_entry(info, jh, dentry, inode, hlock);
        /* It is too bad, we cannot reinsert the name entry back.
         * That means we lose it! */
        if (rc != 0)
@@ -5401,7 +5875,7 @@ again:
         * For the whole directory, only dot/dotdot entry have no FID-in-dirent
         * and needs to get FID from LMA when readdir, it will not affect the
         * performance much. */
-       if ((bh == NULL) || (le32_to_cpu(de->inode) != inode->i_ino) ||
+       if (IS_ERR(bh) || (le32_to_cpu(de->inode) != inode->i_ino) ||
            (dot_dotdot != 0 && !osd_dot_dotdot_has_space(de, dot_dotdot))) {
                *attr |= LUDA_IGNORE;
 
@@ -5445,11 +5919,13 @@ again:
 
                        if (jh == NULL) {
                                brelse(bh);
-                               if (hlock != NULL)
+                               dev->od_dirent_journal = 1;
+                               if (hlock != NULL) {
                                        ldiskfs_htree_unlock(hlock);
-                               else
+                                       hlock = NULL;
+                               } else {
                                        up_read(&obj->oo_ext_idx_sem);
-                               dev->od_dirent_journal = 1;
+                               }
 
                                goto again;
                        }
@@ -5479,11 +5955,13 @@ again:
 
                        if (jh == NULL) {
                                brelse(bh);
-                               if (hlock != NULL)
+                               dev->od_dirent_journal = 1;
+                               if (hlock != NULL) {
                                        ldiskfs_htree_unlock(hlock);
-                               else
+                                       hlock = NULL;
+                               } else {
                                        up_read(&obj->oo_ext_idx_sem);
-                               dev->od_dirent_journal = 1;
+                               }
 
                                goto again;
                        }
@@ -5519,11 +5997,13 @@ again:
 
                if (jh == NULL) {
                        brelse(bh);
-                       if (hlock != NULL)
+                       dev->od_dirent_journal = 1;
+                       if (hlock != NULL) {
                                ldiskfs_htree_unlock(hlock);
-                       else
+                               hlock = NULL;
+                       } else {
                                up_read(&obj->oo_ext_idx_sem);
-                       dev->od_dirent_journal = 1;
+                       }
 
                        goto again;
                }
@@ -5563,7 +6043,8 @@ again:
        GOTO(out, rc);
 
 out:
-       brelse(bh);
+       if (!IS_ERR(bh))
+               brelse(bh);
        if (hlock != NULL) {
                ldiskfs_htree_unlock(hlock);
        } else {
@@ -5822,6 +6303,7 @@ static void osd_key_fini(const struct lu_context *ctx,
 {
        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_inode != NULL)
                OBD_FREE_PTR(lli);
@@ -5831,6 +6313,12 @@ static void osd_key_fini(const struct lu_context *ctx,
        lu_buf_free(&info->oti_iobuf.dr_pg_buf);
        lu_buf_free(&info->oti_iobuf.dr_bl_buf);
        lu_buf_free(&info->oti_big_buf);
+       if (idc != NULL) {
+               LASSERT(info->oti_ins_cache_size > 0);
+               OBD_FREE(idc, sizeof(*idc) * info->oti_ins_cache_size);
+               info->oti_ins_cache = NULL;
+               info->oti_ins_cache_size = 0;
+       }
        OBD_FREE_PTR(info);
 }
 
@@ -5955,7 +6443,7 @@ static int osd_mount(const struct lu_env *env,
        struct osd_thread_info  *info = osd_oti_get(env);
        struct lu_fid           *fid = &info->oti_fid;
        struct inode            *inode;
-       int                      rc = 0, force_over_128tb = 0;
+       int                      rc = 0, force_over_256tb = 0;
         ENTRY;
 
        if (o->od_mnt != NULL)
@@ -5979,10 +6467,17 @@ static int osd_mount(const struct lu_env *env,
                RETURN(-EINVAL);
        }
 #endif
-       if (opts != NULL && strstr(opts, "force_over_128tb") != NULL)
-               force_over_128tb = 1;
+       if (opts != NULL && strstr(opts, "force_over_128tb") != NULL) {
+               CWARN("force_over_128tb option is depricated."
+                     "Filesystems less then 256TB can be created without any"
+                     "force options. Use force_over_256tb option for"
+                     "filesystems greather then 256TB.\n");
+       }
+
+       if (opts != NULL && strstr(opts, "force_over_256tb") != NULL)
+               force_over_256tb = 1;
 
-       __page = alloc_page(GFP_IOFS);
+       __page = alloc_page(GFP_KERNEL);
        if (__page == NULL)
                GOTO(out, rc = -ENOMEM);
        page = (unsigned long)page_address(__page);
@@ -5999,7 +6494,12 @@ static int osd_mount(const struct lu_env *env,
                        "noextents",
                        /* strip out option we processed in osd */
                        "bigendian_extents",
-                       "force_over_128tb",
+#if LUSTRE_VERSION_CODE >= OBD_OCD_VERSION(3,0,53,0)
+#warning "remove force_over_128 option"
+#else
+                       "force_over_128tb (deprecated)",
+#endif
+                       "force_over_256tb",
                        NULL
                };
                strcat(options, opts);
@@ -6027,7 +6527,7 @@ static int osd_mount(const struct lu_env *env,
        /* Glom up mount options */
        if (*options != '\0')
                strcat(options, ",");
-       strlcat(options, "no_mbcache", PAGE_CACHE_SIZE);
+       strlcat(options, "no_mbcache", PAGE_SIZE);
 
        type = get_fs_type("ldiskfs");
        if (!type) {
@@ -6045,11 +6545,11 @@ static int osd_mount(const struct lu_env *env,
                GOTO(out, rc);
        }
 
-       if (ldiskfs_blocks_count(LDISKFS_SB(osd_sb(o))->s_es) > (8ULL << 32) &&
-           force_over_128tb == 0) {
+       if (ldiskfs_blocks_count(LDISKFS_SB(osd_sb(o))->s_es) > (64ULL << 30) &&
+           force_over_256tb == 0) {
                CERROR("%s: device %s LDISKFS does not support filesystems "
-                      "greater than 128TB and can cause data corruption. "
-                      "Use \"force_over_128tb\" mount option to override.\n",
+                      "greater than 256TB and can cause data corruption. "
+                      "Use \"force_over_256tb\" mount option to override.\n",
                       name, dev);
                GOTO(out, rc = -EINVAL);
        }