X-Git-Url: https://git.whamcloud.com/?p=fs%2Flustre-release.git;a=blobdiff_plain;f=lustre%2Flov%2Flov_io.c;h=1adb722528bd883af6fa95cdf54feb697f53b2dc;hp=b100973279bed1c414eeaed611b01b70038768cf;hb=14db1faa0fbe813fed616435303753d390f45827;hpb=ce61bcac8661e08ffa2a6ec4b9782f11cd3388c6

diff --git a/lustre/lov/lov_io.c b/lustre/lov/lov_io.c
index b100973..1adb722 100644
--- a/lustre/lov/lov_io.c
+++ b/lustre/lov/lov_io.c
@@ -23,11 +23,10 @@
  * Copyright (c) 2008, 2010, Oracle and/or its affiliates. All rights reserved.
  * Use is subject to license terms.
  *
- * Copyright (c) 2011, 2016, Intel Corporation.
+ * Copyright (c) 2011, 2017, Intel Corporation.
  */
 /*
  * This file is part of Lustre, http://www.lustre.org/
- * Lustre is a trademark of Sun Microsystems, Inc.
  *
  * Implementation of cl_io for LOV layer.
  *
@@ -56,7 +55,7 @@ static inline struct lov_io_sub *lov_sub_alloc(struct lov_io *lio, int index)
 		OBD_ALLOC_PTR(sub);
 	}
 
-	if (sub != NULL) {
+	if (sub) {
 		INIT_LIST_HEAD(&sub->sub_list);
 		INIT_LIST_HEAD(&sub->sub_linkage);
 		sub->sub_subio_index = index;
@@ -82,13 +81,22 @@ static void lov_io_sub_fini(const struct lu_env *env, struct lov_io *lio,
 
 	cl_io_fini(sub->sub_env, &sub->sub_io);
 
-	if (sub->sub_env != NULL && !IS_ERR(sub->sub_env)) {
+	if (sub->sub_env && !IS_ERR(sub->sub_env)) {
 		cl_env_put(sub->sub_env, &sub->sub_refcheck);
 		sub->sub_env = NULL;
 	}
 	EXIT;
 }
 
+static inline bool
+is_index_within_mirror(struct lov_object *lov, int index, int mirror_index)
+{
+	struct lov_layout_composite *comp = &lov->u.composite;
+	struct lov_mirror_entry *lre = &comp->lo_mirrors[mirror_index];
+
+	return (index >= lre->lre_start && index <= lre->lre_end);
+}
+
 static int lov_io_sub_init(const struct lu_env *env, struct lov_io *lio,
 			   struct lov_io_sub *sub)
 {
@@ -106,10 +114,19 @@ static int lov_io_sub_init(const struct lu_env *env, struct lov_io *lio,
 		     !lov_r0(lov, index)->lo_sub[stripe]))
 		RETURN(-EIO);
 
+	LASSERTF(ergo(lov_is_flr(lov),
+		      is_index_within_mirror(lov, index,
+					     lio->lis_mirror_index)),
+		 DFID "iot = %d, index = %d, mirror = %d\n",
+		 PFID(lu_object_fid(lov2lu(lov))), io->ci_type, index,
+		 lio->lis_mirror_index);
+
 	/* obtain new environment */
 	sub->sub_env = cl_env_get(&sub->sub_refcheck);
-	if (IS_ERR(sub->sub_env))
+	if (IS_ERR(sub->sub_env)) {
 		result = PTR_ERR(sub->sub_env);
+		RETURN(result);
+	}
 
 	sub_obj = lovsub2cl(lov_r0(lov, index)->lo_sub[stripe]);
 	sub_io  = &sub->sub_io;
@@ -122,8 +139,11 @@ static int lov_io_sub_init(const struct lu_env *env, struct lov_io *lio,
 	sub_io->ci_type    = io->ci_type;
 	sub_io->ci_no_srvlock = io->ci_no_srvlock;
 	sub_io->ci_noatime = io->ci_noatime;
-	sub_io->ci_pio = io->ci_pio;
+	sub_io->ci_async_readahead = io->ci_async_readahead;
 	sub_io->ci_lock_no_expand = io->ci_lock_no_expand;
+	sub_io->ci_ndelay = io->ci_ndelay;
+	sub_io->ci_layout_version = io->ci_layout_version;
+	sub_io->ci_tried_all_mirrors = io->ci_tried_all_mirrors;
 
 	result = cl_io_sub_init(sub->sub_env, sub_io, io->ci_type, sub_obj);
 
@@ -150,7 +170,7 @@ struct lov_io_sub *lov_sub_get(const struct lu_env *env,
 
 	if (rc == 0) {
 		sub = lov_sub_alloc(lio, index);
-		if (sub == NULL)
+		if (!sub)
 			GOTO(out, rc = -ENOMEM);
 
 		rc = lov_io_sub_init(env, lio, sub);
@@ -165,6 +185,8 @@ struct lov_io_sub *lov_sub_get(const struct lu_env *env,
 out:
 	if (rc < 0)
 		sub = ERR_PTR(rc);
+	else
+		sub->sub_io.ci_noquota = lio->lis_cl.cis_io->ci_noquota;
 	RETURN(sub);
 }
 
@@ -173,29 +195,278 @@ out:
  * Lov io operations.
  *
  */
+static int lov_io_subio_init(const struct lu_env *env, struct lov_io *lio,
+                             struct cl_io *io)
+{
+	ENTRY;
+
+	LASSERT(lio->lis_object != NULL);
+
+	INIT_LIST_HEAD(&lio->lis_subios);
+	lio->lis_single_subio_index = -1;
+	lio->lis_nr_subios = 0;
 
-int lov_page_index(const struct cl_page *page)
+	RETURN(0);
+}
+
+/**
+ * Decide if it will need write intent RPC
+ */
+static int lov_io_mirror_write_intent(struct lov_io *lio,
+	struct lov_object *obj, struct cl_io *io)
 {
-	const struct cl_page_slice *slice;
+	struct lov_layout_composite *comp = &obj->u.composite;
+	struct lu_extent *ext = &io->ci_write_intent;
+	struct lov_mirror_entry *lre;
+	struct lov_mirror_entry *primary;
+	struct lov_layout_entry *lle;
+	size_t count = 0;
 	ENTRY;
 
-	slice = cl_page_at(page, &lov_device_type);
-	LASSERT(slice != NULL);
-	LASSERT(slice->cpl_obj != NULL);
+	*ext = (typeof(*ext)) { lio->lis_pos, lio->lis_endpos };
+	io->ci_need_write_intent = 0;
+
+	if (!(io->ci_type == CIT_WRITE || cl_io_is_mkwrite(io) ||
+	      cl_io_is_fallocate(io) || cl_io_is_trunc(io)))
+		RETURN(0);
 
-	RETURN(cl2lov_page(slice)->lps_index);
+	/*
+	 * FLR: check if it needs to send a write intent RPC to server.
+	 * Writing to sync_pending file needs write intent RPC to change
+	 * the file state back to write_pending, so that the layout version
+	 * can be increased when the state changes to sync_pending at a later
+	 * time. Otherwise there exists a chance that an evicted client may
+	 * dirty the file data while resync client is working on it.
+	 * Designated I/O is allowed for resync workload.
+	 */
+	if (lov_flr_state(obj) == LCM_FL_RDONLY ||
+	    (lov_flr_state(obj) == LCM_FL_SYNC_PENDING &&
+	     io->ci_designated_mirror == 0)) {
+		io->ci_need_write_intent = 1;
+		RETURN(0);
+	}
+
+	LASSERT((lov_flr_state(obj) == LCM_FL_WRITE_PENDING));
+	LASSERT(comp->lo_preferred_mirror >= 0);
+
+	/*
+	 * need to iterate all components to see if there are
+	 * multiple components covering the writing component
+	 */
+	primary = &comp->lo_mirrors[comp->lo_preferred_mirror];
+	LASSERT(!primary->lre_stale);
+	lov_foreach_mirror_layout_entry(obj, lle, primary) {
+		LASSERT(lle->lle_valid);
+		if (!lu_extent_is_overlapped(ext, lle->lle_extent))
+			continue;
+
+		ext->e_start = min(ext->e_start, lle->lle_extent->e_start);
+		ext->e_end = max(ext->e_end, lle->lle_extent->e_end);
+		++count;
+	}
+	if (count == 0) {
+		CERROR(DFID ": cannot find any valid components covering "
+		       "file extent "DEXT", mirror: %d\n",
+		       PFID(lu_object_fid(lov2lu(obj))), PEXT(ext),
+		       primary->lre_mirror_id);
+		RETURN(-EIO);
+	}
+
+	count = 0;
+	lov_foreach_mirror_entry(obj, lre) {
+		if (lre == primary)
+			continue;
+
+		lov_foreach_mirror_layout_entry(obj, lle, lre) {
+			if (!lle->lle_valid)
+				continue;
+
+			if (lu_extent_is_overlapped(ext, lle->lle_extent)) {
+				++count;
+				break;
+			}
+		}
+	}
+
+	CDEBUG(D_VFSTRACE, DFID "there are %zd components to be staled to "
+	       "modify file extent "DEXT", iot: %d\n",
+	       PFID(lu_object_fid(lov2lu(obj))), count, PEXT(ext), io->ci_type);
+
+	io->ci_need_write_intent = count > 0;
+
+	RETURN(0);
 }
 
-static int lov_io_subio_init(const struct lu_env *env, struct lov_io *lio,
-                             struct cl_io *io)
+static int lov_io_mirror_init(struct lov_io *lio, struct lov_object *obj,
+			       struct cl_io *io)
 {
+	struct lov_layout_composite *comp = &obj->u.composite;
+	int index;
+	int i;
+	int result;
 	ENTRY;
 
-	LASSERT(lio->lis_object != NULL);
+	if (!lov_is_flr(obj)) {
+		/* only locks/pages are manipulated for CIT_MISC op, no
+		 * cl_io_loop() will be called, don't check/set mirror info.
+		 */
+		if (io->ci_type != CIT_MISC) {
+			LASSERT(comp->lo_preferred_mirror == 0);
+			lio->lis_mirror_index = comp->lo_preferred_mirror;
+		}
+		io->ci_ndelay = 0;
+		RETURN(0);
+	}
 
-	INIT_LIST_HEAD(&lio->lis_subios);
-	lio->lis_single_subio_index = -1;
-	lio->lis_nr_subios = 0;
+	/* transfer the layout version for verification */
+	if (io->ci_layout_version == 0)
+		io->ci_layout_version = obj->lo_lsm->lsm_layout_gen;
+
+	/* find the corresponding mirror for designated mirror IO */
+	if (io->ci_designated_mirror > 0) {
+		struct lov_mirror_entry *entry;
+
+		LASSERT(!io->ci_ndelay);
+
+		CDEBUG(D_LAYOUT, "designated I/O mirror state: %d\n",
+		      lov_flr_state(obj));
+
+		if ((cl_io_is_trunc(io) || io->ci_type == CIT_WRITE ||
+		     cl_io_is_fallocate(io)) &&
+		    (io->ci_layout_version != obj->lo_lsm->lsm_layout_gen)) {
+			/*
+			 * For resync I/O, the ci_layout_version was the layout
+			 * version when resync starts. If it doesn't match the
+			 * current object layout version, it means the layout
+			 * has been changed
+			 */
+			RETURN(-ESTALE);
+		}
+
+		io->ci_layout_version |= LU_LAYOUT_RESYNC;
+
+		index = 0;
+		lio->lis_mirror_index = -1;
+		lov_foreach_mirror_entry(obj, entry) {
+			if (entry->lre_mirror_id ==
+			    io->ci_designated_mirror) {
+				lio->lis_mirror_index = index;
+				break;
+			}
+
+			index++;
+		}
+
+		RETURN(lio->lis_mirror_index < 0 ? -EINVAL : 0);
+	}
+
+	result = lov_io_mirror_write_intent(lio, obj, io);
+	if (result)
+		RETURN(result);
+
+	if (io->ci_need_write_intent) {
+		CDEBUG(D_VFSTRACE, DFID " need write intent for [%llu, %llu)\n",
+		       PFID(lu_object_fid(lov2lu(obj))),
+		       lio->lis_pos, lio->lis_endpos);
+
+		if (cl_io_is_trunc(io)) {
+			/**
+			 * for truncate, we uses [size, EOF) to judge whether
+			 * a write intent needs to be send, but we need to
+			 * restore the write extent to [0, size], in truncate,
+			 * the byte in the size position is accessed.
+			 */
+			io->ci_write_intent.e_start = 0;
+			io->ci_write_intent.e_end =
+					io->u.ci_setattr.sa_attr.lvb_size + 1;
+		}
+		/* stop cl_io_init() loop */
+		RETURN(1);
+	}
+
+	if (io->ci_ndelay_tried == 0 || /* first time to try */
+	    /* reset the mirror index if layout has changed */
+	    lio->lis_mirror_layout_gen != obj->lo_lsm->lsm_layout_gen) {
+		lio->lis_mirror_layout_gen = obj->lo_lsm->lsm_layout_gen;
+		index = lio->lis_mirror_index = comp->lo_preferred_mirror;
+	} else {
+		index = lio->lis_mirror_index;
+		LASSERT(index >= 0);
+
+		/* move mirror index to the next one */
+		index = (index + 1) % comp->lo_mirror_count;
+	}
+
+	for (i = 0; i < comp->lo_mirror_count; i++) {
+		struct lu_extent ext = { .e_start = lio->lis_pos,
+					 .e_end   = lio->lis_pos + 1 };
+		struct lov_mirror_entry *lre;
+		struct lov_layout_entry *lle;
+		bool found = false;
+
+		lre = &comp->lo_mirrors[(index + i) % comp->lo_mirror_count];
+		if (!lre->lre_valid)
+			continue;
+
+		if (lre->lre_foreign)
+			continue;
+
+		lov_foreach_mirror_layout_entry(obj, lle, lre) {
+			if (!lle->lle_valid)
+				continue;
+
+			if (lu_extent_is_overlapped(&ext, lle->lle_extent)) {
+				found = true;
+				break;
+			}
+		} /* each component of the mirror */
+		if (found) {
+			index = (index + i) % comp->lo_mirror_count;
+			break;
+		}
+	} /* each mirror */
+
+	if (i == comp->lo_mirror_count) {
+		CERROR(DFID": failed to find a component covering "
+		       "I/O region at %llu\n",
+		       PFID(lu_object_fid(lov2lu(obj))), lio->lis_pos);
+
+		dump_lsm(D_ERROR, obj->lo_lsm);
+
+		RETURN(-EIO);
+	}
+
+	CDEBUG(D_VFSTRACE, DFID ": flr state: %d, move mirror from %d to %d, "
+	       "have retried: %d, mirror count: %d\n",
+	       PFID(lu_object_fid(lov2lu(obj))), lov_flr_state(obj),
+	       lio->lis_mirror_index, index, io->ci_ndelay_tried,
+	       comp->lo_mirror_count);
+
+	lio->lis_mirror_index = index;
+
+	/*
+	 * FLR: if all mirrors have been tried once, most likely the network
+	 * of this client has been partitioned. We should relinquish CPU for
+	 * a while before trying again.
+	 */
+	if (io->ci_ndelay && io->ci_ndelay_tried > 0 &&
+	    (io->ci_ndelay_tried % comp->lo_mirror_count == 0)) {
+		schedule_timeout_interruptible(cfs_time_seconds(1) / 100);
+		if (signal_pending(current))
+			RETURN(-EINTR);
+
+		/**
+		 * we'd set ci_tried_all_mirrors to turn off fast mirror
+		 * switching for read after we've tried all mirrors several
+		 * rounds.
+		 */
+		io->ci_tried_all_mirrors = io->ci_ndelay_tried %
+					   (comp->lo_mirror_count * 4) == 0;
+	}
+	++io->ci_ndelay_tried;
+
+	CDEBUG(D_VFSTRACE, "use %sdelayed RPC state for this IO\n",
+	       io->ci_ndelay ? "non-" : "");
 
 	RETURN(0);
 }
@@ -203,52 +474,61 @@ static int lov_io_subio_init(const struct lu_env *env, struct lov_io *lio,
 static int lov_io_slice_init(struct lov_io *lio,
 			     struct lov_object *obj, struct cl_io *io)
 {
+	int index;
+	int result = 0;
 	ENTRY;
 
 	io->ci_result = 0;
 	lio->lis_object = obj;
-
-	LASSERT(obj->lo_lsm != NULL);
+	lio->lis_cached_entry = LIS_CACHE_ENTRY_NONE;
 
 	switch (io->ci_type) {
 	case CIT_READ:
 	case CIT_WRITE:
-		lio->lis_pos = io->u.ci_rw.rw_range.cir_pos;
-		lio->lis_endpos = lio->lis_pos + io->u.ci_rw.rw_range.cir_count;
+		lio->lis_pos = io->u.ci_rw.crw_pos;
+		lio->lis_endpos = io->u.ci_rw.crw_pos + io->u.ci_rw.crw_count;
 		lio->lis_io_endpos = lio->lis_endpos;
 		if (cl_io_is_append(io)) {
 			LASSERT(io->ci_type == CIT_WRITE);
 
-			/* If there is LOV EA hole, then we may cannot locate
-			 * the current file-tail exactly. */
+			/*
+			 * If there is LOV EA hole, then we may cannot locate
+			 * the current file-tail exactly.
+			 */
 			if (unlikely(obj->lo_lsm->lsm_entries[0]->lsme_pattern &
 				     LOV_PATTERN_F_HOLE))
-				RETURN(-EIO);
+				GOTO(out, result = -EIO);
 
 			lio->lis_pos = 0;
 			lio->lis_endpos = OBD_OBJECT_EOF;
 		}
 		break;
 
-        case CIT_SETATTR:
-                if (cl_io_is_trunc(io))
-                        lio->lis_pos = io->u.ci_setattr.sa_attr.lvb_size;
-                else
-                        lio->lis_pos = 0;
-                lio->lis_endpos = OBD_OBJECT_EOF;
-                break;
+	case CIT_SETATTR:
+		if (cl_io_is_fallocate(io)) {
+			lio->lis_pos = io->u.ci_setattr.sa_falloc_offset;
+			lio->lis_endpos = io->u.ci_setattr.sa_falloc_end;
+		} else if (cl_io_is_trunc(io)) {
+			lio->lis_pos = io->u.ci_setattr.sa_attr.lvb_size;
+			lio->lis_endpos = OBD_OBJECT_EOF;
+		} else {
+			lio->lis_pos = 0;
+			lio->lis_endpos = OBD_OBJECT_EOF;
+		}
+		break;
 
 	case CIT_DATA_VERSION:
 		lio->lis_pos = 0;
 		lio->lis_endpos = OBD_OBJECT_EOF;
 		break;
 
-        case CIT_FAULT: {
-                pgoff_t index = io->u.ci_fault.ft_index;
-                lio->lis_pos = cl_offset(io->ci_obj, index);
-                lio->lis_endpos = cl_offset(io->ci_obj, index + 1);
-                break;
-        }
+	case CIT_FAULT: {
+		pgoff_t index = io->u.ci_fault.ft_index;
+
+		lio->lis_pos = cl_offset(io->ci_obj, index);
+		lio->lis_endpos = cl_offset(io->ci_obj, index + 1);
+		break;
+	}
 
 	case CIT_FSYNC: {
 		lio->lis_pos = io->u.ci_fsync.fi_start;
@@ -262,40 +542,114 @@ static int lov_io_slice_init(struct lov_io *lio,
 		break;
 	}
 
+	case CIT_LSEEK: {
+		lio->lis_pos = io->u.ci_lseek.ls_start;
+		lio->lis_endpos = OBD_OBJECT_EOF;
+		break;
+	}
+
 	case CIT_GLIMPSE:
 		lio->lis_pos = 0;
 		lio->lis_endpos = OBD_OBJECT_EOF;
 
-		if ((obj->lo_lsm->lsm_flags & LCM_FL_FLR_MASK) == LCM_FL_RDONLY)
-			RETURN(1); /* SoM is accurate, no need glimpse */
+		if (lov_flr_state(obj) == LCM_FL_RDONLY &&
+		    !OBD_FAIL_CHECK(OBD_FAIL_FLR_GLIMPSE_IMMUTABLE))
+			/* SoM is accurate, no need glimpse */
+			GOTO(out, result = 1);
 		break;
 
-        case CIT_MISC:
-                lio->lis_pos = 0;
-                lio->lis_endpos = OBD_OBJECT_EOF;
-                break;
+	case CIT_MISC:
+		lio->lis_pos = 0;
+		lio->lis_endpos = OBD_OBJECT_EOF;
+		break;
 
-        default:
-                LBUG();
-        }
+	default:
+		LBUG();
+	}
 
-	RETURN(0);
+	/*
+	 * CIT_MISC + ci_ignore_layout can identify the I/O from the OSC layer,
+	 * it won't care/access lov layout related info.
+	 */
+	if (io->ci_ignore_layout && io->ci_type == CIT_MISC)
+		GOTO(out, result = 0);
+
+	LASSERT(obj->lo_lsm != NULL);
+
+	result = lov_io_mirror_init(lio, obj, io);
+	if (result)
+		GOTO(out, result);
+
+	/* check if it needs to instantiate layout */
+	if (!(io->ci_type == CIT_WRITE || cl_io_is_mkwrite(io) ||
+	      cl_io_is_fallocate(io) ||
+	      (cl_io_is_trunc(io) && io->u.ci_setattr.sa_attr.lvb_size > 0)))
+		GOTO(out, result = 0);
+
+	/*
+	 * for truncate, it only needs to instantiate the components
+	 * before the truncated size.
+	 */
+	if (cl_io_is_trunc(io)) {
+		io->ci_write_intent.e_start = 0;
+		/* for writes, e_end is endpos, the location of the file
+		 * pointer after the write is completed, so it is not accessed.
+		 * For truncate, 'end' is the size, and *is* acccessed.
+		 * In other words, writes are [start, end), but truncate is
+		 * [start, size], where both are included.  So add 1 to the
+		 * size when creating the write intent to account for this.
+		 */
+		io->ci_write_intent.e_end =
+			io->u.ci_setattr.sa_attr.lvb_size + 1;
+	} else {
+		io->ci_write_intent.e_start = lio->lis_pos;
+		io->ci_write_intent.e_end = lio->lis_endpos;
+	}
+
+	index = 0;
+	lov_foreach_io_layout(index, lio, &io->ci_write_intent) {
+		if (!lsm_entry_inited(obj->lo_lsm, index)) {
+			io->ci_need_write_intent = 1;
+			break;
+		}
+	}
+
+	if (io->ci_need_write_intent && io->ci_designated_mirror > 0) {
+		/*
+		 * REINT_SYNC RPC has already tried to instantiate all of the
+		 * components involved, obviously it didn't succeed. Skip this
+		 * mirror for now. The server won't be able to figure out
+		 * which mirror it should instantiate components
+		 */
+		CERROR(DFID": trying to instantiate components for designated "
+		       "I/O, file state: %d\n",
+		       PFID(lu_object_fid(lov2lu(obj))), lov_flr_state(obj));
+
+		io->ci_need_write_intent = 0;
+		GOTO(out, result = -EIO);
+	}
+
+	if (io->ci_need_write_intent)
+		GOTO(out, result = 1);
+
+	EXIT;
+
+out:
+	return result;
 }
 
 static void lov_io_fini(const struct lu_env *env, const struct cl_io_slice *ios)
 {
 	struct lov_io *lio = cl2lov_io(env, ios);
 	struct lov_object *lov = cl2lov(ios->cis_obj);
+	struct lov_io_sub *sub;
 
 	ENTRY;
-
 	LASSERT(list_empty(&lio->lis_active));
 
-	while (!list_empty(&lio->lis_subios)) {
-		struct lov_io_sub *sub = list_entry(lio->lis_subios.next,
-						    struct lov_io_sub,
-						    sub_list);
-
+	while ((sub = list_first_entry_or_null(&lio->lis_subios,
+					       struct lov_io_sub,
+					       sub_list)) != NULL) {
 		list_del_init(&sub->sub_list);
 		lio->lis_nr_subios--;
 
@@ -306,7 +660,7 @@ static void lov_io_fini(const struct lu_env *env, const struct cl_io_slice *ios)
 
 	LASSERT(atomic_read(&lov->lo_active_ios) > 0);
 	if (atomic_dec_and_test(&lov->lo_active_ios))
-		wake_up_all(&lov->lo_waitq);
+		wake_up(&lov->lo_waitq);
 	EXIT;
 }
 
@@ -319,16 +673,28 @@ static void lov_io_sub_inherit(struct lov_io_sub *sub, struct lov_io *lio,
 	int index = lov_comp_entry(sub->sub_subio_index);
 	int stripe = lov_comp_stripe(sub->sub_subio_index);
 
-	io->ci_pio = parent->ci_pio;
 	switch (io->ci_type) {
 	case CIT_SETATTR: {
 		io->u.ci_setattr.sa_attr = parent->u.ci_setattr.sa_attr;
 		io->u.ci_setattr.sa_attr_flags =
 			parent->u.ci_setattr.sa_attr_flags;
-		io->u.ci_setattr.sa_valid = parent->u.ci_setattr.sa_valid;
+		io->u.ci_setattr.sa_avalid = parent->u.ci_setattr.sa_avalid;
+		io->u.ci_setattr.sa_xvalid = parent->u.ci_setattr.sa_xvalid;
+		io->u.ci_setattr.sa_falloc_mode =
+			parent->u.ci_setattr.sa_falloc_mode;
 		io->u.ci_setattr.sa_stripe_index = stripe;
 		io->u.ci_setattr.sa_parent_fid =
 					parent->u.ci_setattr.sa_parent_fid;
+		/* For SETATTR(fallocate) pass the subtype to lower IO */
+		io->u.ci_setattr.sa_subtype = parent->u.ci_setattr.sa_subtype;
+		if (cl_io_is_fallocate(io)) {
+			io->u.ci_setattr.sa_falloc_offset = start;
+			io->u.ci_setattr.sa_falloc_end = end;
+			io->u.ci_setattr.sa_falloc_uid =
+				parent->u.ci_setattr.sa_falloc_uid;
+			io->u.ci_setattr.sa_falloc_gid =
+				parent->u.ci_setattr.sa_falloc_gid;
+		}
 		if (cl_io_is_trunc(io)) {
 			loff_t new_size = parent->u.ci_setattr.sa_attr.lvb_size;
 
@@ -364,16 +730,13 @@ static void lov_io_sub_inherit(struct lov_io_sub *sub, struct lov_io *lio,
 	}
 	case CIT_READ:
 	case CIT_WRITE: {
-		io->u.ci_rw.rw_ptask = parent->u.ci_rw.rw_ptask;
-		io->u.ci_rw.rw_iter = parent->u.ci_rw.rw_iter;
-		io->u.ci_rw.rw_iocb = parent->u.ci_rw.rw_iocb;
-		io->u.ci_rw.rw_file = parent->u.ci_rw.rw_file;
-		io->u.ci_rw.rw_sync = parent->u.ci_rw.rw_sync;
+		io->u.ci_wr.wr_sync = cl_io_is_sync_write(parent);
+		io->ci_tried_all_mirrors = parent->ci_tried_all_mirrors;
 		if (cl_io_is_append(parent)) {
-			io->u.ci_rw.rw_append = 1;
+			io->u.ci_wr.wr_append = 1;
 		} else {
-			io->u.ci_rw.rw_range.cir_pos = start;
-			io->u.ci_rw.rw_range.cir_count = end - start;
+			io->u.ci_rw.crw_pos = start;
+			io->u.ci_rw.crw_count = end - start;
 		}
 		break;
 	}
@@ -385,6 +748,12 @@ static void lov_io_sub_inherit(struct lov_io_sub *sub, struct lov_io *lio,
 		io->u.ci_ladvise.li_flags = parent->u.ci_ladvise.li_flags;
 		break;
 	}
+	case CIT_LSEEK: {
+		io->u.ci_lseek.ls_start = start;
+		io->u.ci_lseek.ls_whence = parent->u.ci_lseek.ls_whence;
+		io->u.ci_lseek.ls_result = parent->u.ci_lseek.ls_result;
+		break;
+	}
 	case CIT_GLIMPSE:
 	case CIT_MISC:
 	default:
@@ -394,63 +763,78 @@ static void lov_io_sub_inherit(struct lov_io_sub *sub, struct lov_io *lio,
 
 static loff_t lov_offset_mod(loff_t val, int delta)
 {
-        if (val != OBD_OBJECT_EOF)
-                val += delta;
-        return val;
+	if (val != OBD_OBJECT_EOF)
+		val += delta;
+	return val;
 }
 
+static int lov_io_add_sub(const struct lu_env *env, struct lov_io *lio,
+			  struct lov_io_sub *sub, u64 start, u64 end)
+{
+	int rc;
+
+	end = lov_offset_mod(end, 1);
+	lov_io_sub_inherit(sub, lio, start, end);
+	rc = cl_io_iter_init(sub->sub_env, &sub->sub_io);
+	if (rc != 0) {
+		cl_io_iter_fini(sub->sub_env, &sub->sub_io);
+		return rc;
+	}
+
+	list_add_tail(&sub->sub_linkage, &lio->lis_active);
+
+	return rc;
+}
 static int lov_io_iter_init(const struct lu_env *env,
 			    const struct cl_io_slice *ios)
 {
-	struct cl_io         *io = ios->cis_io;
-	struct lov_io        *lio = cl2lov_io(env, ios);
+	struct lov_io *lio = cl2lov_io(env, ios);
 	struct lov_stripe_md *lsm = lio->lis_object->lo_lsm;
-	struct lov_io_sub    *sub;
-	struct lov_layout_entry *le;
+	struct lov_io_sub *sub;
 	struct lu_extent ext;
 	int index;
 	int rc = 0;
 
-        ENTRY;
+	ENTRY;
 
 	ext.e_start = lio->lis_pos;
 	ext.e_end = lio->lis_endpos;
 
-	index = 0;
-	lov_foreach_layout_entry(lio->lis_object, le) {
+	lov_foreach_io_layout(index, lio, &ext) {
+		struct lov_layout_entry *le = lov_entry(lio->lis_object, index);
 		struct lov_layout_raid0 *r0 = &le->lle_raid0;
 		u64 start;
 		u64 end;
 		int stripe;
+		bool tested_trunc_stripe = false;
 
-		index++;
-		if (!lu_extent_is_overlapped(&ext, &le->lle_extent))
-			continue;
+		r0->lo_trunc_stripeno = -1;
 
 		CDEBUG(D_VFSTRACE, "component[%d] flags %#x\n",
-		       index - 1, lsm->lsm_entries[index - 1]->lsme_flags);
-		if (!lsm_entry_inited(lsm, index - 1)) {
-			/* truncate IO will trigger write intent as well, and
-			 * it's handled in lov_io_setattr_iter_init() */
-			if (io->ci_type == CIT_WRITE || cl_io_is_mkwrite(io)) {
-				io->ci_need_write_intent = 1;
-				/* execute it in main thread */
-				io->ci_pio = 0;
-				rc = -ENODATA;
-				break;
-			}
+		       index, lsm->lsm_entries[index]->lsme_flags);
+		if (!lsm_entry_inited(lsm, index)) {
+			/*
+			 * Read from uninitialized components should return
+			 * zero filled pages.
+			 */
+			continue;
+		}
 
-			/* Read from uninitialized components should return
-			 * zero filled pages. */
+		if (lsm_entry_is_foreign(lsm, index))
 			continue;
+
+		if (!le->lle_valid && !ios->cis_io->ci_designated_mirror) {
+			CERROR("I/O to invalid component: %d, mirror: %d\n",
+			       index, lio->lis_mirror_index);
+			RETURN(-EIO);
 		}
 
 		for (stripe = 0; stripe < r0->lo_nr; stripe++) {
-			if (!lov_stripe_intersects(lsm, index - 1, stripe,
+			if (!lov_stripe_intersects(lsm, index, stripe,
 						   &ext, &start, &end))
 				continue;
 
-			if (unlikely(r0->lo_sub[stripe] == NULL)) {
+			if (unlikely(!r0->lo_sub[stripe])) {
 				if (ios->cis_io->ci_type == CIT_READ ||
 				    ios->cis_io->ci_type == CIT_WRITE ||
 				    ios->cis_io->ci_type == CIT_FAULT)
@@ -459,29 +843,79 @@ static int lov_io_iter_init(const struct lu_env *env,
 				continue;
 			}
 
-			end = lov_offset_mod(end, 1);
+			if (cl_io_is_trunc(ios->cis_io) &&
+			    !tested_trunc_stripe) {
+				int prev;
+				u64 tr_start;
+
+				prev = (stripe == 0) ? r0->lo_nr - 1 :
+							stripe - 1;
+				/**
+				 * Only involving previous stripe if the
+				 * truncate in this component is at the
+				 * beginning of this stripe.
+				 */
+				tested_trunc_stripe = true;
+				if (ext.e_start < lsm->lsm_entries[index]->
+							lsme_extent.e_start) {
+					/* need previous stripe involvement */
+					r0->lo_trunc_stripeno = prev;
+				} else {
+					tr_start = ext.e_start;
+					tr_start = lov_do_div64(tr_start,
+						      stripe_width(lsm, index));
+					/* tr_start %= stripe_swidth */
+					if (tr_start == stripe * lsm->
+							lsm_entries[index]->
+							lsme_stripe_size)
+						r0->lo_trunc_stripeno = prev;
+				}
+			}
+
+			/* if the last stripe is the trunc stripeno */
+			if (r0->lo_trunc_stripeno == stripe)
+				r0->lo_trunc_stripeno = -1;
+
 			sub = lov_sub_get(env, lio,
-					  lov_comp_index(index - 1, stripe));
-			if (IS_ERR(sub)) {
-				rc = PTR_ERR(sub);
+					  lov_comp_index(index, stripe));
+			if (IS_ERR(sub))
+				return PTR_ERR(sub);
+
+			rc = lov_io_add_sub(env, lio, sub, start, end);
+			if (rc != 0)
 				break;
+		}
+		if (rc != 0)
+			break;
+
+		if (r0->lo_trunc_stripeno != -1) {
+			stripe = r0->lo_trunc_stripeno;
+			if (unlikely(!r0->lo_sub[stripe])) {
+				r0->lo_trunc_stripeno = -1;
+				continue;
+			}
+			sub = lov_sub_get(env, lio,
+					  lov_comp_index(index, stripe));
+			if (IS_ERR(sub))
+				return PTR_ERR(sub);
+
+			/**
+			 * the prev sub could be used by another truncate, we'd
+			 * skip it. LU-14128 happends when expand truncate +
+			 * read get wrong kms.
+			 */
+			if (!list_empty(&sub->sub_linkage)) {
+				r0->lo_trunc_stripeno = -1;
+				continue;
 			}
 
-			lov_io_sub_inherit(sub, lio, start, end);
-			rc = cl_io_iter_init(sub->sub_env, &sub->sub_io);
-			if (rc != 0)
-				cl_io_iter_fini(sub->sub_env, &sub->sub_io);
+			(void)lov_stripe_intersects(lsm, index, stripe, &ext,
+						    &start, &end);
+			rc = lov_io_add_sub(env, lio, sub, start, end);
 			if (rc != 0)
 				break;
 
-			CDEBUG(D_VFSTRACE,
-				"shrink stripe: {%d, %d} range: [%llu, %llu)\n",
-				index, stripe, start, end);
-
-			list_add_tail(&sub->sub_linkage, &lio->lis_active);
 		}
-		if (rc != 0)
-			break;
 	}
 	RETURN(rc);
 }
@@ -489,12 +923,10 @@ static int lov_io_iter_init(const struct lu_env *env,
 static int lov_io_rw_iter_init(const struct lu_env *env,
 			       const struct cl_io_slice *ios)
 {
-	struct cl_io *io = ios->cis_io;
 	struct lov_io *lio = cl2lov_io(env, ios);
-	struct lov_stripe_md *lsm = lio->lis_object->lo_lsm;
+	struct cl_io *io = ios->cis_io;
 	struct lov_stripe_md_entry *lse;
-	struct cl_io_range *range = &io->u.ci_rw.rw_range;
-	loff_t start = range->cir_pos;
+	loff_t start = io->u.ci_rw.crw_pos;
 	loff_t next;
 	int index;
 
@@ -504,14 +936,14 @@ static int lov_io_rw_iter_init(const struct lu_env *env,
 	if (cl_io_is_append(io))
 		RETURN(lov_io_iter_init(env, ios));
 
-	index = lov_lsm_entry(lsm, range->cir_pos);
+	index = lov_io_layout_at(lio, io->u.ci_rw.crw_pos);
 	if (index < 0) { /* non-existing layout component */
 		if (io->ci_type == CIT_READ) {
-			/* TODO: it needs to detect the next component and
-			 * then set the next pos */
+			/*
+			 * TODO: it needs to detect the next component and
+			 * then set the next pos
+			 */
 			io->ci_continue = 0;
-			/* execute it in main thread */
-			io->ci_pio = 0;
 
 			RETURN(lov_io_iter_init(env, ios));
 		}
@@ -519,8 +951,15 @@ static int lov_io_rw_iter_init(const struct lu_env *env,
 		RETURN(-ENODATA);
 	}
 
+	if (!lov_entry(lio->lis_object, index)->lle_valid &&
+	    !io->ci_designated_mirror)
+		RETURN(io->ci_type == CIT_READ ? -EAGAIN : -EIO);
+
 	lse = lov_lse(lio->lis_object, index);
 
+	if (lsme_is_foreign(lse))
+		RETURN(-EINVAL);
+
 	next = MAX_LFS_FILESIZE;
 	if (lse->lsme_stripe_count > 1) {
 		unsigned long ssize = lse->lsme_stripe_size;
@@ -531,37 +970,20 @@ static int lov_io_rw_iter_init(const struct lu_env *env,
 			next = MAX_LFS_FILESIZE;
 	}
 
-	LASSERTF(range->cir_pos >= lse->lsme_extent.e_start,
-		 "pos %lld, [%lld, %lld)\n", range->cir_pos,
+	LASSERTF(io->u.ci_rw.crw_pos >= lse->lsme_extent.e_start,
+		 "pos %lld, [%lld, %lld)\n", io->u.ci_rw.crw_pos,
 		 lse->lsme_extent.e_start, lse->lsme_extent.e_end);
 	next = min_t(__u64, next, lse->lsme_extent.e_end);
 	next = min_t(loff_t, next, lio->lis_io_endpos);
 
-	io->ci_continue  = next < lio->lis_io_endpos;
-	range->cir_count = next - range->cir_pos;
-	lio->lis_pos     = range->cir_pos;
-	lio->lis_endpos  = range->cir_pos + range->cir_count;
+	io->ci_continue = next < lio->lis_io_endpos;
+	io->u.ci_rw.crw_count = next - io->u.ci_rw.crw_pos;
+	lio->lis_pos    = io->u.ci_rw.crw_pos;
+	lio->lis_endpos = io->u.ci_rw.crw_pos + io->u.ci_rw.crw_count;
 	CDEBUG(D_VFSTRACE,
-	       "stripe: {%d, %llu} range: [%llu, %llu) end: %llu, count: %zd\n",
-	       index, start, lio->lis_pos, lio->lis_endpos,
-	       lio->lis_io_endpos, range->cir_count);
-
-	if (!io->ci_continue) {
-		/* the last piece of IO, execute it in main thread */
-		io->ci_pio = 0;
-	}
-
-	if (io->ci_pio) {
-		/* it only splits IO here for parallel IO,
-		 * there will be no actual IO going to occur,
-		 * so it doesn't need to invoke lov_io_iter_init()
-		 * to initialize sub IOs. */
-		if (!lsm_entry_inited(lsm, index)) {
-			io->ci_need_write_intent = 1;
-			RETURN(-ENODATA);
-		}
-		RETURN(0);
-	}
+	       "stripe: %llu chunk: [%llu, %llu) %llu, %zd\n",
+	       (__u64)start, lio->lis_pos, lio->lis_endpos,
+	       (__u64)lio->lis_io_endpos, io->u.ci_rw.crw_count);
 
 	/*
 	 * XXX The following call should be optimized: we know, that
@@ -575,19 +997,14 @@ static int lov_io_setattr_iter_init(const struct lu_env *env,
 {
 	struct lov_io *lio = cl2lov_io(env, ios);
 	struct cl_io *io = ios->cis_io;
-	struct lov_stripe_md *lsm = lio->lis_object->lo_lsm;
 	int index;
 	ENTRY;
 
 	if (cl_io_is_trunc(io) && lio->lis_pos > 0) {
-		index = lov_lsm_entry(lsm, lio->lis_pos - 1);
+		index = lov_io_layout_at(lio, lio->lis_pos - 1);
 		/* no entry found for such offset */
-		if (index < 0) {
+		if (index < 0)
 			RETURN(io->ci_result = -ENODATA);
-		} else if (!lsm_entry_inited(lsm, index)) {
-			io->ci_need_write_intent = 1;
-			RETURN(io->ci_result = -ENODATA);
-		}
 	}
 
 	RETURN(lov_io_iter_init(env, ios));
@@ -614,49 +1031,54 @@ static int lov_io_call(const struct lu_env *env, struct lov_io *lio,
 
 static int lov_io_lock(const struct lu_env *env, const struct cl_io_slice *ios)
 {
-        ENTRY;
-        RETURN(lov_io_call(env, cl2lov_io(env, ios), cl_io_lock));
+	ENTRY;
+	RETURN(lov_io_call(env, cl2lov_io(env, ios), cl_io_lock));
 }
 
 static int lov_io_start(const struct lu_env *env, const struct cl_io_slice *ios)
 {
-        ENTRY;
-        RETURN(lov_io_call(env, cl2lov_io(env, ios), cl_io_start));
+	ENTRY;
+	RETURN(lov_io_call(env, cl2lov_io(env, ios), cl_io_start));
 }
 
 static int lov_io_end_wrapper(const struct lu_env *env, struct cl_io *io)
 {
-        ENTRY;
-        /*
-         * It's possible that lov_io_start() wasn't called against this
-         * sub-io, either because previous sub-io failed, or upper layer
-         * completed IO.
-         */
-        if (io->ci_state == CIS_IO_GOING)
-                cl_io_end(env, io);
-        else
-                io->ci_state = CIS_IO_FINISHED;
-        RETURN(0);
+	ENTRY;
+	/*
+	 * It's possible that lov_io_start() wasn't called against this
+	 * sub-io, either because previous sub-io failed, or upper layer
+	 * completed IO.
+	 */
+	if (io->ci_state == CIS_IO_GOING)
+		cl_io_end(env, io);
+	else
+		io->ci_state = CIS_IO_FINISHED;
+	RETURN(0);
 }
 
 static int lov_io_iter_fini_wrapper(const struct lu_env *env, struct cl_io *io)
 {
-        cl_io_iter_fini(env, io);
-        RETURN(0);
+	cl_io_iter_fini(env, io);
+	RETURN(0);
 }
 
 static int lov_io_unlock_wrapper(const struct lu_env *env, struct cl_io *io)
 {
-        cl_io_unlock(env, io);
-        RETURN(0);
+	cl_io_unlock(env, io);
+	RETURN(0);
 }
 
 static void lov_io_end(const struct lu_env *env, const struct cl_io_slice *ios)
 {
-        int rc;
+	int rc;
+
+	/* Before ending each i/o, we must set lis_cached_entry to tell the
+	 * next i/o not to use stale cached lis information.
+	 */
+	cl2lov_io(env, ios)->lis_cached_entry = LIS_CACHE_ENTRY_NONE;
 
-        rc = lov_io_call(env, cl2lov_io(env, ios), lov_io_end_wrapper);
-        LASSERT(rc == 0);
+	rc = lov_io_call(env, cl2lov_io(env, ios), lov_io_end_wrapper);
+	LASSERT(rc == 0);
 }
 
 static void
@@ -664,14 +1086,18 @@ lov_io_data_version_end(const struct lu_env *env, const struct cl_io_slice *ios)
 {
 	struct lov_io *lio = cl2lov_io(env, ios);
 	struct cl_io *parent = lio->lis_cl.cis_io;
+	struct cl_data_version_io *pdv = &parent->u.ci_data_version;
 	struct lov_io_sub *sub;
 
 	ENTRY;
 	list_for_each_entry(sub, &lio->lis_active, sub_linkage) {
-		lov_io_end_wrapper(env, &sub->sub_io);
+		struct cl_data_version_io *sdv = &sub->sub_io.u.ci_data_version;
 
-		parent->u.ci_data_version.dv_data_version +=
-			sub->sub_io.u.ci_data_version.dv_data_version;
+		lov_io_end_wrapper(sub->sub_env, &sub->sub_io);
+
+		pdv->dv_data_version += sdv->dv_data_version;
+		if (pdv->dv_layout_version > sdv->dv_layout_version)
+			pdv->dv_layout_version = sdv->dv_layout_version;
 
 		if (parent->ci_result == 0)
 			parent->ci_result = sub->sub_io.ci_result;
@@ -683,26 +1109,26 @@ lov_io_data_version_end(const struct lu_env *env, const struct cl_io_slice *ios)
 static void lov_io_iter_fini(const struct lu_env *env,
                              const struct cl_io_slice *ios)
 {
-        struct lov_io *lio = cl2lov_io(env, ios);
-        int rc;
+	struct lov_io *lio = cl2lov_io(env, ios);
+	int rc;
 
-        ENTRY;
-        rc = lov_io_call(env, lio, lov_io_iter_fini_wrapper);
-        LASSERT(rc == 0);
+	ENTRY;
+	rc = lov_io_call(env, lio, lov_io_iter_fini_wrapper);
+	LASSERT(rc == 0);
 	while (!list_empty(&lio->lis_active))
 		list_del_init(lio->lis_active.next);
-        EXIT;
+	EXIT;
 }
 
 static void lov_io_unlock(const struct lu_env *env,
                           const struct cl_io_slice *ios)
 {
-        int rc;
+	int rc;
 
-        ENTRY;
-        rc = lov_io_call(env, cl2lov_io(env, ios), lov_io_unlock_wrapper);
-        LASSERT(rc == 0);
-        EXIT;
+	ENTRY;
+	rc = lov_io_call(env, cl2lov_io(env, ios), lov_io_unlock_wrapper);
+	LASSERT(rc == 0);
+	EXIT;
 }
 
 static int lov_io_read_ahead(const struct lu_env *env,
@@ -724,14 +1150,19 @@ static int lov_io_read_ahead(const struct lu_env *env,
 	ENTRY;
 
 	offset = cl_offset(obj, start);
-	index = lov_lsm_entry(loo->lo_lsm, offset);
-	if (index < 0 || !lsm_entry_inited(loo->lo_lsm, index))
+	index = lov_io_layout_at(lio, offset);
+	if (index < 0 || !lsm_entry_inited(loo->lo_lsm, index) ||
+	    lsm_entry_is_foreign(loo->lo_lsm, index))
 		RETURN(-ENODATA);
 
+	/* avoid readahead to expand to stale components */
+	if (!lov_entry(loo, index)->lle_valid)
+		RETURN(-EIO);
+
 	stripe = lov_stripe_number(loo->lo_lsm, index, offset);
 
 	r0 = lov_r0(loo, index);
-	if (unlikely(r0->lo_sub[stripe] == NULL))
+	if (unlikely(!r0->lo_sub[stripe]))
 		RETURN(-EIO);
 
 	sub = lov_sub_get(env, lio, lov_comp_index(index, stripe));
@@ -744,7 +1175,8 @@ static int lov_io_read_ahead(const struct lu_env *env,
 			      ra);
 
 	CDEBUG(D_READA, DFID " cra_end = %lu, stripes = %d, rc = %d\n",
-	       PFID(lu_object_fid(lov2lu(loo))), ra->cra_end, r0->lo_nr, rc);
+	       PFID(lu_object_fid(lov2lu(loo))), ra->cra_end_idx,
+		    r0->lo_nr, rc);
 	if (rc != 0)
 		RETURN(rc);
 
@@ -756,29 +1188,83 @@ static int lov_io_read_ahead(const struct lu_env *env,
 	 */
 
 	/* cra_end is stripe level, convert it into file level */
-	ra_end = ra->cra_end;
+	ra_end = ra->cra_end_idx;
 	if (ra_end != CL_PAGE_EOF)
-		ra->cra_end = lov_stripe_pgoff(loo->lo_lsm, index,
-					       ra_end, stripe);
+		ra->cra_end_idx = lov_stripe_pgoff(loo->lo_lsm, index,
+						   ra_end, stripe);
 
 	/* boundary of current component */
-	ra_end = cl_index(obj, (loff_t)lov_lse(loo, index)->lsme_extent.e_end);
-	if (ra_end != CL_PAGE_EOF && ra->cra_end >= ra_end)
-		ra->cra_end = ra_end - 1;
+	ra_end = cl_index(obj, (loff_t)lov_io_extent(lio, index)->e_end);
+	if (ra_end != CL_PAGE_EOF && ra->cra_end_idx >= ra_end)
+		ra->cra_end_idx = ra_end - 1;
 
 	if (r0->lo_nr == 1) /* single stripe file */
 		RETURN(0);
 
 	pps = lov_lse(loo, index)->lsme_stripe_size >> PAGE_SHIFT;
 
-	CDEBUG(D_READA, DFID " max_index = %lu, pps = %u, index = %u, "
+	CDEBUG(D_READA, DFID " max_index = %lu, pps = %u, index = %d, "
 	       "stripe_size = %u, stripe no = %u, start index = %lu\n",
-	       PFID(lu_object_fid(lov2lu(loo))), ra->cra_end, pps, index,
+	       PFID(lu_object_fid(lov2lu(loo))), ra->cra_end_idx, pps, index,
 	       lov_lse(loo, index)->lsme_stripe_size, stripe, start);
 
 	/* never exceed the end of the stripe */
-	ra->cra_end = min_t(pgoff_t,
-			    ra->cra_end, start + pps - start % pps - 1);
+	ra->cra_end_idx = min_t(pgoff_t, ra->cra_end_idx,
+				start + pps - start % pps - 1);
+	RETURN(0);
+}
+
+int lov_io_lru_reserve(const struct lu_env *env,
+		       const struct cl_io_slice *ios, loff_t pos, size_t bytes)
+{
+	struct lov_io *lio = cl2lov_io(env, ios);
+	struct lov_stripe_md *lsm = lio->lis_object->lo_lsm;
+	struct lov_io_sub *sub;
+	struct lu_extent ext;
+	int index;
+	int rc = 0;
+
+	ENTRY;
+
+	ext.e_start = pos;
+	ext.e_end = pos + bytes;
+	lov_foreach_io_layout(index, lio, &ext) {
+		struct lov_layout_entry *le = lov_entry(lio->lis_object, index);
+		struct lov_layout_raid0 *r0 = &le->lle_raid0;
+		u64 start;
+		u64 end;
+		int stripe;
+
+		if (!lsm_entry_inited(lsm, index))
+			continue;
+
+		if (!le->lle_valid && !ios->cis_io->ci_designated_mirror) {
+			CERROR(DFID": I/O to invalid component: %d, mirror: %d\n",
+			       PFID(lu_object_fid(lov2lu(lio->lis_object))),
+			       index, lio->lis_mirror_index);
+			RETURN(-EIO);
+		}
+
+		for (stripe = 0; stripe < r0->lo_nr; stripe++) {
+			if (!lov_stripe_intersects(lsm, index, stripe,
+						   &ext, &start, &end))
+				continue;
+
+			if (unlikely(!r0->lo_sub[stripe]))
+				RETURN(-EIO);
+
+			sub = lov_sub_get(env, lio,
+					  lov_comp_index(index, stripe));
+			if (IS_ERR(sub))
+				return PTR_ERR(sub);
+
+			rc = cl_io_lru_reserve(sub->sub_env, &sub->sub_io, start,
+					       end - start + 1);
+			if (rc != 0)
+				RETURN(rc);
+		}
+	}
+
 	RETURN(0);
 }
 
@@ -805,38 +1291,49 @@ static int lov_io_submit(const struct lu_env *env,
 	struct lov_io		*lio = cl2lov_io(env, ios);
 	struct lov_io_sub	*sub;
 	struct cl_page_list	*plist = &lov_env_info(env)->lti_plist;
-	struct cl_page		*page;
+	struct cl_page		*page = cl_page_list_first(qin);
+	struct cl_page		*tmp;
+	bool dio = false;
 	int index;
 	int rc = 0;
 	ENTRY;
 
-	if (lio->lis_nr_subios == 1) {
-		int idx = lio->lis_single_subio_index;
-
-		sub = lov_sub_get(env, lio, idx);
-		LASSERT(!IS_ERR(sub));
-		LASSERT(sub == &lio->lis_single_subio);
-		rc = cl_io_submit_rw(sub->sub_env, &sub->sub_io,
-				     crt, queue);
-		RETURN(rc);
-	}
+	if (page->cp_type == CPT_TRANSIENT)
+		dio = true;
 
 	cl_page_list_init(plist);
 	while (qin->pl_nr > 0) {
 		struct cl_2queue  *cl2q = &lov_env_info(env)->lti_cl2q;
 
-		cl_2queue_init(cl2q);
-
 		page = cl_page_list_first(qin);
+		if (lov_page_is_empty(page)) {
+			cl_page_list_move(&queue->c2_qout, qin, page);
+
+			/*
+			 * it could only be mirror read to get here therefore
+			 * the pages will be transient. We don't care about
+			 * the return code of cl_page_prep() at all.
+			 */
+			(void) cl_page_prep(env, ios->cis_io, page, crt);
+			cl_page_completion(env, page, crt, 0);
+			continue;
+		}
+
+		cl_2queue_init(cl2q);
 		cl_page_list_move(&cl2q->c2_qin, qin, page);
 
-		index = lov_page_index(page);
-		while (qin->pl_nr > 0) {
-			page = cl_page_list_first(qin);
-			if (index != lov_page_index(page))
-				break;
+		index = page->cp_lov_index;
+		/* DIO is already split by stripe */
+		if (!dio) {
+			cl_page_list_for_each_safe(page, tmp, qin) {
+				/* this page is not on this stripe */
+				if (index != page->cp_lov_index)
+					continue;
 
-			cl_page_list_move(&cl2q->c2_qin, qin, page);
+				cl_page_list_move(&cl2q->c2_qin, qin, page);
+			}
+		} else {
+			cl_page_list_splice(qin, &cl2q->c2_qin);
 		}
 
 		sub = lov_sub_get(env, lio, index);
@@ -867,7 +1364,7 @@ static int lov_io_commit_async(const struct lu_env *env,
 			       cl_commit_cbt cb)
 {
 	struct cl_page_list *plist = &lov_env_info(env)->lti_plist;
-	struct lov_io     *lio = cl2lov_io(env, ios);
+	struct lov_io *lio = cl2lov_io(env, ios);
 	struct lov_io_sub *sub;
 	struct cl_page *page;
 	int rc = 0;
@@ -876,6 +1373,8 @@ static int lov_io_commit_async(const struct lu_env *env,
 	if (lio->lis_nr_subios == 1) {
 		int idx = lio->lis_single_subio_index;
 
+		LASSERT(!lov_page_is_empty(cl_page_list_first(queue)));
+
 		sub = lov_sub_get(env, lio, idx);
 		LASSERT(!IS_ERR(sub));
 		LASSERT(sub == &lio->lis_single_subio);
@@ -891,12 +1390,14 @@ static int lov_io_commit_async(const struct lu_env *env,
 
 		LASSERT(plist->pl_nr == 0);
 		page = cl_page_list_first(queue);
+		LASSERT(!lov_page_is_empty(page));
+
 		cl_page_list_move(plist, queue, page);
 
-		index = lov_page_index(page);
+		index = page->cp_lov_index;
 		while (queue->pl_nr > 0) {
 			page = cl_page_list_first(queue);
-			if (index != lov_page_index(page))
+			if (index != page->cp_lov_index)
 				break;
 
 			cl_page_list_move(plist, queue, page);
@@ -918,6 +1419,10 @@ static int lov_io_commit_async(const struct lu_env *env,
 			break;
 
 		from = 0;
+
+		if (lov_comp_entry(index) !=
+		    lov_comp_entry(page->cp_lov_index))
+			cl_io_extent_release(sub->sub_env, &sub->sub_io);
 	}
 
 	/* for error case, add the page back into the qin list */
@@ -937,17 +1442,82 @@ static int lov_io_fault_start(const struct lu_env *env,
 	struct cl_fault_io *fio;
 	struct lov_io      *lio;
 	struct lov_io_sub  *sub;
+	loff_t offset;
+	int entry;
+	int stripe;
 
 	ENTRY;
 
 	fio = &ios->cis_io->u.ci_fault;
 	lio = cl2lov_io(env, ios);
-	sub = lov_sub_get(env, lio, lov_page_index(fio->ft_page));
+
+	/**
+	 * LU-14502: ft_page could be an existing cl_page associated with
+	 * the vmpage covering the fault index, and the page may still
+	 * refer to another mirror of an old IO.
+	 */
+	if (lov_is_flr(lio->lis_object)) {
+		offset = cl_offset(ios->cis_obj, fio->ft_index);
+		entry = lov_io_layout_at(lio, offset);
+		if (entry < 0) {
+			CERROR(DFID": page fault index %lu invalid component: "
+			       "%d, mirror: %d\n",
+			       PFID(lu_object_fid(&ios->cis_obj->co_lu)),
+			       fio->ft_index, entry,
+			       lio->lis_mirror_index);
+			RETURN(-EIO);
+		}
+		stripe = lov_stripe_number(lio->lis_object->lo_lsm,
+					   entry, offset);
+
+		if (fio->ft_page->cp_lov_index !=
+		    lov_comp_index(entry, stripe)) {
+			CDEBUG(D_INFO, DFID": page fault at index %lu, "
+			       "at mirror %u comp entry %u stripe %u, "
+			       "been used with comp entry %u stripe %u\n",
+			       PFID(lu_object_fid(&ios->cis_obj->co_lu)),
+			       fio->ft_index, lio->lis_mirror_index,
+			       entry, stripe,
+			       lov_comp_entry(fio->ft_page->cp_lov_index),
+			       lov_comp_stripe(fio->ft_page->cp_lov_index));
+
+			fio->ft_page->cp_lov_index =
+					lov_comp_index(entry, stripe);
+		}
+	}
+
+	sub = lov_sub_get(env, lio, fio->ft_page->cp_lov_index);
 	sub->sub_io.u.ci_fault.ft_nob = fio->ft_nob;
 
 	RETURN(lov_io_start(env, ios));
 }
 
+static int lov_io_setattr_start(const struct lu_env *env,
+				const struct cl_io_slice *ios)
+{
+	struct lov_io *lio = cl2lov_io(env, ios);
+	struct cl_io *parent = ios->cis_io;
+	struct lov_io_sub *sub;
+	struct lov_stripe_md *lsm = lio->lis_object->lo_lsm;
+
+	ENTRY;
+
+	if (cl_io_is_fallocate(parent)) {
+		list_for_each_entry(sub, &lio->lis_active, sub_linkage) {
+			loff_t size = parent->u.ci_setattr.sa_attr.lvb_size;
+			int index = lov_comp_entry(sub->sub_subio_index);
+			int stripe = lov_comp_stripe(sub->sub_subio_index);
+
+			size = lov_size_to_stripe(lsm, index, size, stripe);
+			sub->sub_io.u.ci_setattr.sa_attr.lvb_size = size;
+			sub->sub_io.u.ci_setattr.sa_avalid =
+						parent->u.ci_setattr.sa_avalid;
+		}
+	}
+
+	RETURN(lov_io_start(env, ios));
+}
+
 static void lov_io_fsync_end(const struct lu_env *env,
 			     const struct cl_io_slice *ios)
 {
@@ -968,53 +1538,148 @@ static void lov_io_fsync_end(const struct lu_env *env,
 	RETURN_EXIT;
 }
 
+static void lov_io_lseek_end(const struct lu_env *env,
+			     const struct cl_io_slice *ios)
+{
+	struct lov_io *lio = cl2lov_io(env, ios);
+	struct cl_io *io = lio->lis_cl.cis_io;
+	struct lov_stripe_md *lsm = lio->lis_object->lo_lsm;
+	struct lov_io_sub *sub;
+	loff_t offset = -ENXIO;
+	__u64 hole_off = 0;
+	bool seek_hole = io->u.ci_lseek.ls_whence == SEEK_HOLE;
+
+	ENTRY;
+
+	list_for_each_entry(sub, &lio->lis_active, sub_linkage) {
+		struct cl_io *subio = &sub->sub_io;
+		int index = lov_comp_entry(sub->sub_subio_index);
+		int stripe = lov_comp_stripe(sub->sub_subio_index);
+		loff_t sub_off, lov_off;
+		__u64 comp_end = lsm->lsm_entries[index]->lsme_extent.e_end;
+
+		lov_io_end_wrapper(sub->sub_env, subio);
+
+		if (io->ci_result == 0)
+			io->ci_result = sub->sub_io.ci_result;
+
+		if (io->ci_result)
+			continue;
+
+		CDEBUG(D_INFO, DFID": entry %x stripe %u: SEEK_%s from %lld\n",
+		       PFID(lu_object_fid(lov2lu(lio->lis_object))),
+		       index, stripe, seek_hole ? "HOLE" : "DATA",
+		       subio->u.ci_lseek.ls_start);
+
+		/* first subio with positive result is what we need */
+		sub_off = subio->u.ci_lseek.ls_result;
+		/* Expected error, offset is out of stripe file size */
+		if (sub_off == -ENXIO)
+			continue;
+		/* Any other errors are not expected with ci_result == 0 */
+		if (sub_off < 0) {
+			CDEBUG(D_INFO, "unexpected error: rc = %lld\n",
+			       sub_off);
+			io->ci_result = sub_off;
+			continue;
+		}
+		lov_off = lov_stripe_size(lsm, index, sub_off + 1, stripe) - 1;
+		if (lov_off < 0) {
+			/* the only way to get negatove lov_off here is too big
+			 * result. Return -EOVERFLOW then.
+			 */
+			io->ci_result = -EOVERFLOW;
+			CDEBUG(D_INFO, "offset %llu is too big: rc = %d\n",
+			       (u64)lov_off, io->ci_result);
+			continue;
+		}
+		if (lov_off < io->u.ci_lseek.ls_start) {
+			io->ci_result = -EINVAL;
+			CDEBUG(D_INFO, "offset %lld < start %lld: rc = %d\n",
+			       sub_off, io->u.ci_lseek.ls_start, io->ci_result);
+			continue;
+		}
+		/* resulting offset can be out of component range if stripe
+		 * object is full and its file size was returned as virtual
+		 * hole start. Skip this result, the next component will give
+		 * us correct lseek result but keep possible hole offset in
+		 * case there is no more components ahead
+		 */
+		if (lov_off >= comp_end) {
+			/* must be SEEK_HOLE case */
+			if (likely(seek_hole)) {
+				/* save comp end as potential hole offset */
+				hole_off = max_t(__u64, comp_end, hole_off);
+			} else {
+				io->ci_result = -EINVAL;
+				CDEBUG(D_INFO,
+				       "off %lld >= comp_end %llu: rc = %d\n",
+				       lov_off, comp_end, io->ci_result);
+			}
+			continue;
+		}
+
+		CDEBUG(D_INFO, "SEEK_%s: %lld->%lld/%lld: rc = %d\n",
+		       seek_hole ? "HOLE" : "DATA",
+		       subio->u.ci_lseek.ls_start, sub_off, lov_off,
+		       sub->sub_io.ci_result);
+		offset = min_t(__u64, offset, lov_off);
+	}
+	/* no result but some component returns hole as component end */
+	if (seek_hole && offset == -ENXIO && hole_off > 0)
+		offset = hole_off;
+
+	io->u.ci_lseek.ls_result = offset;
+	RETURN_EXIT;
+}
+
 static const struct cl_io_operations lov_io_ops = {
-        .op = {
-                [CIT_READ] = {
-                        .cio_fini      = lov_io_fini,
-                        .cio_iter_init = lov_io_rw_iter_init,
-                        .cio_iter_fini = lov_io_iter_fini,
-                        .cio_lock      = lov_io_lock,
-                        .cio_unlock    = lov_io_unlock,
-                        .cio_start     = lov_io_start,
-                        .cio_end       = lov_io_end
-                },
-                [CIT_WRITE] = {
-                        .cio_fini      = lov_io_fini,
-                        .cio_iter_init = lov_io_rw_iter_init,
-                        .cio_iter_fini = lov_io_iter_fini,
-                        .cio_lock      = lov_io_lock,
-                        .cio_unlock    = lov_io_unlock,
-                        .cio_start     = lov_io_start,
-                        .cio_end       = lov_io_end
-                },
+	.op = {
+		[CIT_READ] = {
+			.cio_fini      = lov_io_fini,
+			.cio_iter_init = lov_io_rw_iter_init,
+			.cio_iter_fini = lov_io_iter_fini,
+			.cio_lock      = lov_io_lock,
+			.cio_unlock    = lov_io_unlock,
+			.cio_start     = lov_io_start,
+			.cio_end       = lov_io_end
+		},
+		[CIT_WRITE] = {
+			.cio_fini      = lov_io_fini,
+			.cio_iter_init = lov_io_rw_iter_init,
+			.cio_iter_fini = lov_io_iter_fini,
+			.cio_lock      = lov_io_lock,
+			.cio_unlock    = lov_io_unlock,
+			.cio_start     = lov_io_start,
+			.cio_end       = lov_io_end
+		},
 		[CIT_SETATTR] = {
 			.cio_fini      = lov_io_fini,
 			.cio_iter_init = lov_io_setattr_iter_init,
 			.cio_iter_fini = lov_io_iter_fini,
 			.cio_lock      = lov_io_lock,
 			.cio_unlock    = lov_io_unlock,
-			.cio_start     = lov_io_start,
+			.cio_start     = lov_io_setattr_start,
 			.cio_end       = lov_io_end
 		},
 		[CIT_DATA_VERSION] = {
-			.cio_fini	= lov_io_fini,
-			.cio_iter_init	= lov_io_iter_init,
-			.cio_iter_fini	= lov_io_iter_fini,
-			.cio_lock	= lov_io_lock,
-			.cio_unlock	= lov_io_unlock,
-			.cio_start	= lov_io_start,
-			.cio_end	= lov_io_data_version_end,
+			.cio_fini       = lov_io_fini,
+			.cio_iter_init  = lov_io_iter_init,
+			.cio_iter_fini  = lov_io_iter_fini,
+			.cio_lock       = lov_io_lock,
+			.cio_unlock     = lov_io_unlock,
+			.cio_start      = lov_io_start,
+			.cio_end        = lov_io_data_version_end,
+		},
+		[CIT_FAULT] = {
+			.cio_fini      = lov_io_fini,
+			.cio_iter_init = lov_io_iter_init,
+			.cio_iter_fini = lov_io_iter_fini,
+			.cio_lock      = lov_io_lock,
+			.cio_unlock    = lov_io_unlock,
+			.cio_start     = lov_io_fault_start,
+			.cio_end       = lov_io_end
 		},
-                [CIT_FAULT] = {
-                        .cio_fini      = lov_io_fini,
-                        .cio_iter_init = lov_io_iter_init,
-                        .cio_iter_fini = lov_io_iter_fini,
-                        .cio_lock      = lov_io_lock,
-                        .cio_unlock    = lov_io_unlock,
-                        .cio_start     = lov_io_fault_start,
-                        .cio_end       = lov_io_end
-                },
 		[CIT_FSYNC] = {
 			.cio_fini      = lov_io_fini,
 			.cio_iter_init = lov_io_iter_init,
@@ -1033,6 +1698,15 @@ static const struct cl_io_operations lov_io_ops = {
 			.cio_start     = lov_io_start,
 			.cio_end       = lov_io_end
 		},
+		[CIT_LSEEK] = {
+			.cio_fini      = lov_io_fini,
+			.cio_iter_init = lov_io_iter_init,
+			.cio_iter_fini = lov_io_iter_fini,
+			.cio_lock      = lov_io_lock,
+			.cio_unlock    = lov_io_unlock,
+			.cio_start     = lov_io_start,
+			.cio_end       = lov_io_lseek_end
+		},
 		[CIT_GLIMPSE] = {
 			.cio_fini      = lov_io_fini,
 		},
@@ -1040,7 +1714,8 @@ static const struct cl_io_operations lov_io_ops = {
 			.cio_fini      = lov_io_fini
 		}
 	},
-	.cio_read_ahead		       = lov_io_read_ahead,
+	.cio_read_ahead                = lov_io_read_ahead,
+	.cio_lru_reserve	       = lov_io_lru_reserve,
 	.cio_submit                    = lov_io_submit,
 	.cio_commit_async              = lov_io_commit_async,
 };
@@ -1058,7 +1733,7 @@ static void lov_empty_io_fini(const struct lu_env *env,
 	ENTRY;
 
 	if (atomic_dec_and_test(&lov->lo_active_ios))
-		wake_up_all(&lov->lo_waitq);
+		wake_up(&lov->lo_waitq);
 	EXIT;
 }
 
@@ -1072,7 +1747,7 @@ static int lov_empty_io_submit(const struct lu_env *env,
 static void lov_empty_impossible(const struct lu_env *env,
                                  struct cl_io_slice *ios)
 {
-        LBUG();
+	LBUG();
 }
 
 #define LOV_EMPTY_IMPOSSIBLE ((void *)lov_empty_impossible)
@@ -1081,37 +1756,37 @@ static void lov_empty_impossible(const struct lu_env *env,
  * An io operation vector for files without stripes.
  */
 static const struct cl_io_operations lov_empty_io_ops = {
-        .op = {
-                [CIT_READ] = {
-                        .cio_fini       = lov_empty_io_fini,
+	.op = {
+		[CIT_READ] = {
+			.cio_fini       = lov_empty_io_fini,
 #if 0
-                        .cio_iter_init  = LOV_EMPTY_IMPOSSIBLE,
-                        .cio_lock       = LOV_EMPTY_IMPOSSIBLE,
-                        .cio_start      = LOV_EMPTY_IMPOSSIBLE,
-                        .cio_end        = LOV_EMPTY_IMPOSSIBLE
+			.cio_iter_init  = LOV_EMPTY_IMPOSSIBLE,
+			.cio_lock       = LOV_EMPTY_IMPOSSIBLE,
+			.cio_start      = LOV_EMPTY_IMPOSSIBLE,
+			.cio_end        = LOV_EMPTY_IMPOSSIBLE
 #endif
-                },
-                [CIT_WRITE] = {
-                        .cio_fini      = lov_empty_io_fini,
-                        .cio_iter_init = LOV_EMPTY_IMPOSSIBLE,
-                        .cio_lock      = LOV_EMPTY_IMPOSSIBLE,
-                        .cio_start     = LOV_EMPTY_IMPOSSIBLE,
-                        .cio_end       = LOV_EMPTY_IMPOSSIBLE
-                },
-                [CIT_SETATTR] = {
-                        .cio_fini      = lov_empty_io_fini,
-                        .cio_iter_init = LOV_EMPTY_IMPOSSIBLE,
-                        .cio_lock      = LOV_EMPTY_IMPOSSIBLE,
-                        .cio_start     = LOV_EMPTY_IMPOSSIBLE,
-                        .cio_end       = LOV_EMPTY_IMPOSSIBLE
-                },
-                [CIT_FAULT] = {
-                        .cio_fini      = lov_empty_io_fini,
-                        .cio_iter_init = LOV_EMPTY_IMPOSSIBLE,
-                        .cio_lock      = LOV_EMPTY_IMPOSSIBLE,
-                        .cio_start     = LOV_EMPTY_IMPOSSIBLE,
-                        .cio_end       = LOV_EMPTY_IMPOSSIBLE
-                },
+		},
+		[CIT_WRITE] = {
+			.cio_fini      = lov_empty_io_fini,
+			.cio_iter_init = LOV_EMPTY_IMPOSSIBLE,
+			.cio_lock      = LOV_EMPTY_IMPOSSIBLE,
+			.cio_start     = LOV_EMPTY_IMPOSSIBLE,
+			.cio_end       = LOV_EMPTY_IMPOSSIBLE
+		},
+		[CIT_SETATTR] = {
+			.cio_fini      = lov_empty_io_fini,
+			.cio_iter_init = LOV_EMPTY_IMPOSSIBLE,
+			.cio_lock      = LOV_EMPTY_IMPOSSIBLE,
+			.cio_start     = LOV_EMPTY_IMPOSSIBLE,
+			.cio_end       = LOV_EMPTY_IMPOSSIBLE
+		},
+		[CIT_FAULT] = {
+			.cio_fini      = lov_empty_io_fini,
+			.cio_iter_init = LOV_EMPTY_IMPOSSIBLE,
+			.cio_lock      = LOV_EMPTY_IMPOSSIBLE,
+			.cio_start     = LOV_EMPTY_IMPOSSIBLE,
+			.cio_end       = LOV_EMPTY_IMPOSSIBLE
+		},
 		[CIT_FSYNC] = {
 			.cio_fini      = lov_empty_io_fini
 		},
@@ -1132,9 +1807,10 @@ static const struct cl_io_operations lov_empty_io_ops = {
 int lov_io_init_composite(const struct lu_env *env, struct cl_object *obj,
 			  struct cl_io *io)
 {
-	struct lov_io       *lio = lov_env_io(env);
-	struct lov_object   *lov = cl2lov(obj);
+	struct lov_io *lio = lov_env_io(env);
+	struct lov_object *lov = cl2lov(obj);
 	int result;
+
 	ENTRY;
 
 	INIT_LIST_HEAD(&lio->lis_active);
@@ -1172,6 +1848,7 @@ int lov_io_init_empty(const struct lu_env *env, struct cl_object *obj,
 		break;
 	case CIT_FSYNC:
 	case CIT_LADVISE:
+	case CIT_LSEEK:
 	case CIT_SETATTR:
 	case CIT_DATA_VERSION:
 		result = +1;
@@ -1210,20 +1887,24 @@ int lov_io_init_released(const struct lu_env *env, struct cl_object *obj,
 		LASSERTF(0, "invalid type %d\n", io->ci_type);
 		result = -EOPNOTSUPP;
 		break;
-	case CIT_MISC:
 	case CIT_GLIMPSE:
+	case CIT_MISC:
 	case CIT_FSYNC:
 	case CIT_LADVISE:
 	case CIT_DATA_VERSION:
 		result = 1;
 		break;
 	case CIT_SETATTR:
-		/* the truncate to 0 is managed by MDT:
+		/*
+		 * the truncate to 0 is managed by MDT:
 		 * - in open, for open O_TRUNC
 		 * - in setattr, for truncate
 		 */
-		/* the truncate is for size > 0 so triggers a restore */
-		if (cl_io_is_trunc(io)) {
+		/*
+		 * the truncate is for size > 0 so triggers a restore,
+		 * also trigger a restore for prealloc/punch
+		 */
+		if (cl_io_is_trunc(io) || cl_io_is_fallocate(io)) {
 			io->ci_restore_needed = 1;
 			result = -ENODATA;
 		} else
@@ -1232,6 +1913,7 @@ int lov_io_init_released(const struct lu_env *env, struct cl_object *obj,
 	case CIT_READ:
 	case CIT_WRITE:
 	case CIT_FAULT:
+	case CIT_LSEEK:
 		io->ci_restore_needed = 1;
 		result = -ENODATA;
 		break;
@@ -1245,4 +1927,47 @@ int lov_io_init_released(const struct lu_env *env, struct cl_object *obj,
 	io->ci_result = result < 0 ? result : 0;
 	RETURN(result);
 }
+
+/**
+ * Return the index in composite:lo_entries by the file offset
+ */
+int lov_io_layout_at(struct lov_io *lio, __u64 offset)
+{
+	struct lov_object *lov = lio->lis_object;
+	struct lov_layout_composite *comp = &lov->u.composite;
+	int start_index = 0;
+	int end_index = comp->lo_entry_count - 1;
+	int i;
+
+	LASSERT(lov->lo_type == LLT_COMP);
+
+	/* This is actual file offset so nothing can cover eof. */
+	if (offset == LUSTRE_EOF)
+		return -1;
+
+	if (lov_is_flr(lov)) {
+		struct lov_mirror_entry *lre;
+
+		LASSERT(lio->lis_mirror_index >= 0);
+
+		lre = &comp->lo_mirrors[lio->lis_mirror_index];
+		start_index = lre->lre_start;
+		end_index = lre->lre_end;
+	}
+
+	for (i = start_index; i <= end_index; i++) {
+		struct lov_layout_entry *lle = lov_entry(lov, i);
+
+		LASSERT(!lsme_is_foreign(lle->lle_lsme));
+
+		if ((offset >= lle->lle_extent->e_start &&
+		     offset < lle->lle_extent->e_end) ||
+		    (offset == OBD_OBJECT_EOF &&
+		     lle->lle_extent->e_end == OBD_OBJECT_EOF))
+			return i;
+	}
+
+	return -1;
+}
+
 /** @} lov */