1 files changed, 621 insertions, 77 deletions

diff --git a/drivers/staging/lustre/lustre/lov/lov_object.c b/drivers/staging/lustre/lustre/lov/lov_object.c
index 52f736338887..76d4256fa828 100644
--- a/drivers/staging/lustre/lustre/lov/lov_object.c
+++ b/drivers/staging/lustre/lustre/lov/lov_object.c
@@ -39,6 +39,11 @@
 
 #include "lov_cl_internal.h"
 
+static inline struct lov_device *lov_object_dev(struct lov_object *obj)
+{
+	return lu2lov_dev(obj->lo_cl.co_lu.lo_dev);
+}
+
 /** \addtogroup lov
  *  @{
  */
@@ -51,7 +56,7 @@
 
 struct lov_layout_operations {
 	int (*llo_init)(const struct lu_env *env, struct lov_device *dev,
-			struct lov_object *lov,
+			struct lov_object *lov, struct lov_stripe_md *lsm,
 			const struct cl_object_conf *conf,
 			union lov_layout_state *state);
 	int (*llo_delete)(const struct lu_env *env, struct lov_object *lov,
@@ -75,12 +80,11 @@ struct lov_layout_operations {
 
 static int lov_layout_wait(const struct lu_env *env, struct lov_object *lov);
 
-void lov_lsm_put(struct cl_object *unused, struct lov_stripe_md *lsm)
+static void lov_lsm_put(struct lov_stripe_md *lsm)
 {
 	if (lsm)
 		lov_free_memmd(&lsm);
 }
-EXPORT_SYMBOL(lov_lsm_put);
 
 /*****************************************************************************
  *
@@ -97,17 +101,17 @@ static void lov_install_empty(const struct lu_env *env,
 	 */
 }
 
-static int lov_init_empty(const struct lu_env *env,
-			  struct lov_device *dev, struct lov_object *lov,
+static int lov_init_empty(const struct lu_env *env, struct lov_device *dev,
+			  struct lov_object *lov, struct lov_stripe_md *lsm,
 			  const struct cl_object_conf *conf,
-			  union  lov_layout_state *state)
+			  union lov_layout_state *state)
 {
 	return 0;
 }
 
 static void lov_install_raid0(const struct lu_env *env,
 			      struct lov_object *lov,
-			      union  lov_layout_state *state)
+			      union lov_layout_state *state)
 {
 }
 
@@ -212,8 +216,8 @@ static int lov_page_slice_fixup(struct lov_object *lov,
 	return cl_object_header(stripe)->coh_page_bufsize;
 }
 
-static int lov_init_raid0(const struct lu_env *env,
-			  struct lov_device *dev, struct lov_object *lov,
+static int lov_init_raid0(const struct lu_env *env, struct lov_device *dev,
+			  struct lov_object *lov, struct lov_stripe_md *lsm,
 			  const struct cl_object_conf *conf,
 			  union  lov_layout_state *state)
 {
@@ -223,7 +227,6 @@ static int lov_init_raid0(const struct lu_env *env,
 	struct cl_object	*stripe;
 	struct lov_thread_info  *lti     = lov_env_info(env);
 	struct cl_object_conf   *subconf = &lti->lti_stripe_conf;
-	struct lov_stripe_md    *lsm     = conf->u.coc_md->lsm;
 	struct lu_fid	   *ofid    = &lti->lti_fid;
 	struct lov_layout_raid0 *r0      = &state->raid0;
 
@@ -298,13 +301,11 @@ out:
 	return result;
 }
 
-static int lov_init_released(const struct lu_env *env,
-			     struct lov_device *dev, struct lov_object *lov,
+static int lov_init_released(const struct lu_env *env, struct lov_device *dev,
+			     struct lov_object *lov, struct lov_stripe_md *lsm,
 			     const struct cl_object_conf *conf,
 			     union  lov_layout_state *state)
 {
-	struct lov_stripe_md *lsm = conf->u.coc_md->lsm;
-
 	LASSERT(lsm);
 	LASSERT(lsm_is_released(lsm));
 	LASSERT(!lov->lo_lsm);
@@ -313,6 +314,40 @@ static int lov_init_released(const struct lu_env *env,
 	return 0;
 }
 
+static struct cl_object *lov_find_subobj(const struct lu_env *env,
+					 struct lov_object *lov,
+					 struct lov_stripe_md *lsm,
+					 int stripe_idx)
+{
+	struct lov_device *dev = lu2lov_dev(lov2lu(lov)->lo_dev);
+	struct lov_oinfo *oinfo = lsm->lsm_oinfo[stripe_idx];
+	struct lov_thread_info *lti = lov_env_info(env);
+	struct lu_fid *ofid = &lti->lti_fid;
+	struct cl_device *subdev;
+	struct cl_object *result;
+	int ost_idx;
+	int rc;
+
+	if (lov->lo_type != LLT_RAID0) {
+		result = NULL;
+		goto out;
+	}
+
+	ost_idx = oinfo->loi_ost_idx;
+	rc = ostid_to_fid(ofid, &oinfo->loi_oi, ost_idx);
+	if (rc) {
+		result = NULL;
+		goto out;
+	}
+
+	subdev = lovsub2cl_dev(dev->ld_target[ost_idx]);
+	result = lov_sub_find(env, subdev, ofid, NULL);
+out:
+	if (!result)
+		result = ERR_PTR(-EINVAL);
+	return result;
+}
+
 static int lov_delete_empty(const struct lu_env *env, struct lov_object *lov,
 			    union lov_layout_state *state)
 {
@@ -687,31 +722,24 @@ static int lov_layout_wait(const struct lu_env *env, struct lov_object *lov)
 }
 
 static int lov_layout_change(const struct lu_env *unused,
-			     struct lov_object *lov,
+			     struct lov_object *lov, struct lov_stripe_md *lsm,
 			     const struct cl_object_conf *conf)
 {
-	int result;
-	enum lov_layout_type llt = LLT_EMPTY;
+	enum lov_layout_type llt = lov_type(lsm);
 	union lov_layout_state *state = &lov->u;
 	const struct lov_layout_operations *old_ops;
 	const struct lov_layout_operations *new_ops;
-
-	void *cookie;
 	struct lu_env *env;
 	int refcheck;
+	int rc;
 
 	LASSERT(0 <= lov->lo_type && lov->lo_type < ARRAY_SIZE(lov_dispatch));
 
-	if (conf->u.coc_md)
-		llt = lov_type(conf->u.coc_md->lsm);
-	LASSERT(0 <= llt && llt < ARRAY_SIZE(lov_dispatch));
-
-	cookie = cl_env_reenter();
 	env = cl_env_get(&refcheck);
-	if (IS_ERR(env)) {
-		cl_env_reexit(cookie);
+	if (IS_ERR(env))
 		return PTR_ERR(env);
-	}
+
+	LASSERT(0 <= llt && llt < ARRAY_SIZE(lov_dispatch));
 
 	CDEBUG(D_INODE, DFID" from %s to %s\n",
 	       PFID(lu_object_fid(lov2lu(lov))),
@@ -720,38 +748,37 @@ static int lov_layout_change(const struct lu_env *unused,
 	old_ops = &lov_dispatch[lov->lo_type];
 	new_ops = &lov_dispatch[llt];
 
-	result = cl_object_prune(env, &lov->lo_cl);
-	if (result != 0)
+	rc = cl_object_prune(env, &lov->lo_cl);
+	if (rc)
+		goto out;
+
+	rc = old_ops->llo_delete(env, lov, &lov->u);
+	if (rc)
 		goto out;
 
-	result = old_ops->llo_delete(env, lov, &lov->u);
-	if (result == 0) {
-		old_ops->llo_fini(env, lov, &lov->u);
+	old_ops->llo_fini(env, lov, &lov->u);
 
-		LASSERT(atomic_read(&lov->lo_active_ios) == 0);
+	LASSERT(!atomic_read(&lov->lo_active_ios));
 
-		lov->lo_type = LLT_EMPTY;
-		/* page bufsize fixup */
-		cl_object_header(&lov->lo_cl)->coh_page_bufsize -=
+	lov->lo_type = LLT_EMPTY;
+
+	/* page bufsize fixup */
+	cl_object_header(&lov->lo_cl)->coh_page_bufsize -=
 			lov_page_slice_fixup(lov, NULL);
 
-		result = new_ops->llo_init(env,
-					lu2lov_dev(lov->lo_cl.co_lu.lo_dev),
-					lov, conf, state);
-		if (result == 0) {
-			new_ops->llo_install(env, lov, state);
-			lov->lo_type = llt;
-		} else {
-			new_ops->llo_delete(env, lov, state);
-			new_ops->llo_fini(env, lov, state);
-			/* this file becomes an EMPTY file. */
-		}
+	rc = new_ops->llo_init(env, lov_object_dev(lov), lov, lsm, conf, state);
+	if (rc) {
+		new_ops->llo_delete(env, lov, state);
+		new_ops->llo_fini(env, lov, state);
+		/* this file becomes an EMPTY file. */
+		goto out;
 	}
 
+	new_ops->llo_install(env, lov, state);
+	lov->lo_type = llt;
 out:
 	cl_env_put(env, &refcheck);
-	cl_env_reexit(cookie);
-	return result;
+	return rc;
 }
 
 /*****************************************************************************
@@ -762,26 +789,38 @@ out:
 int lov_object_init(const struct lu_env *env, struct lu_object *obj,
 		    const struct lu_object_conf *conf)
 {
-	struct lov_device	    *dev   = lu2lov_dev(obj->lo_dev);
 	struct lov_object	    *lov   = lu2lov(obj);
+	struct lov_device *dev = lov_object_dev(lov);
 	const struct cl_object_conf  *cconf = lu2cl_conf(conf);
 	union  lov_layout_state      *set   = &lov->u;
 	const struct lov_layout_operations *ops;
-	int result;
+	struct lov_stripe_md *lsm = NULL;
+	int rc;
 
 	init_rwsem(&lov->lo_type_guard);
 	atomic_set(&lov->lo_active_ios, 0);
 	init_waitqueue_head(&lov->lo_waitq);
-
 	cl_object_page_init(lu2cl(obj), sizeof(struct lov_page));
 
+	lov->lo_type = LLT_EMPTY;
+	if (cconf->u.coc_layout.lb_buf) {
+		lsm = lov_unpackmd(dev->ld_lov,
+				   cconf->u.coc_layout.lb_buf,
+				   cconf->u.coc_layout.lb_len);
+		if (IS_ERR(lsm))
+			return PTR_ERR(lsm);
+	}
+
 	/* no locking is necessary, as object is being created */
-	lov->lo_type = lov_type(cconf->u.coc_md->lsm);
+	lov->lo_type = lov_type(lsm);
 	ops = &lov_dispatch[lov->lo_type];
-	result = ops->llo_init(env, dev, lov, cconf, set);
-	if (result == 0)
+	rc = ops->llo_init(env, dev, lov, lsm, cconf, set);
+	if (!rc)
 		ops->llo_install(env, lov, set);
-	return result;
+
+	lov_lsm_put(lsm);
+
+	return rc;
 }
 
 static int lov_conf_set(const struct lu_env *env, struct cl_object *obj,
@@ -791,6 +830,15 @@ static int lov_conf_set(const struct lu_env *env, struct cl_object *obj,
 	struct lov_object	*lov = cl2lov(obj);
 	int			 result = 0;
 
+	if (conf->coc_opc == OBJECT_CONF_SET &&
+	    conf->u.coc_layout.lb_buf) {
+		lsm = lov_unpackmd(lov_object_dev(lov)->ld_lov,
+				   conf->u.coc_layout.lb_buf,
+				   conf->u.coc_layout.lb_len);
+		if (IS_ERR(lsm))
+			return PTR_ERR(lsm);
+	}
+
 	lov_conf_lock(lov);
 	if (conf->coc_opc == OBJECT_CONF_INVALIDATE) {
 		lov->lo_layout_invalid = true;
@@ -810,8 +858,6 @@ static int lov_conf_set(const struct lu_env *env, struct cl_object *obj,
 
 	LASSERT(conf->coc_opc == OBJECT_CONF_SET);
 
-	if (conf->u.coc_md)
-		lsm = conf->u.coc_md->lsm;
 	if ((!lsm && !lov->lo_lsm) ||
 	    ((lsm && lov->lo_lsm) &&
 	     (lov->lo_lsm->lsm_layout_gen == lsm->lsm_layout_gen) &&
@@ -829,11 +875,12 @@ static int lov_conf_set(const struct lu_env *env, struct cl_object *obj,
 		goto out;
 	}
 
-	result = lov_layout_change(env, lov, conf);
+	result = lov_layout_change(env, lov, lsm, conf);
 	lov->lo_layout_invalid = result != 0;
 
 out:
 	lov_conf_unlock(lov);
+	lov_lsm_put(lsm);
 	CDEBUG(D_INODE, DFID" lo_layout_invalid=%d\n",
 	       PFID(lu_object_fid(lov2lu(lov))), lov->lo_layout_invalid);
 	return result;
@@ -911,6 +958,473 @@ int lov_lock_init(const struct lu_env *env, struct cl_object *obj,
 				    io);
 }
 
+/**
+ * We calculate on which OST the mapping will end. If the length of mapping
+ * is greater than (stripe_size * stripe_count) then the last_stripe will
+ * will be one just before start_stripe. Else we check if the mapping
+ * intersects each OST and find last_stripe.
+ * This function returns the last_stripe and also sets the stripe_count
+ * over which the mapping is spread
+ *
+ * \param lsm [in]		striping information for the file
+ * \param fm_start [in]		logical start of mapping
+ * \param fm_end [in]		logical end of mapping
+ * \param start_stripe [in]	starting stripe of the mapping
+ * \param stripe_count [out]	the number of stripes across which to map is
+ *				returned
+ *
+ * \retval last_stripe		return the last stripe of the mapping
+ */
+static int fiemap_calc_last_stripe(struct lov_stripe_md *lsm,
+				   loff_t fm_start, loff_t fm_end,
+				   int start_stripe, int *stripe_count)
+{
+	int last_stripe;
+	loff_t obd_start;
+	loff_t obd_end;
+	int i, j;
+
+	if (fm_end - fm_start > lsm->lsm_stripe_size * lsm->lsm_stripe_count) {
+		last_stripe = (start_stripe < 1 ? lsm->lsm_stripe_count - 1 :
+			       start_stripe - 1);
+		*stripe_count = lsm->lsm_stripe_count;
+	} else {
+		for (j = 0, i = start_stripe; j < lsm->lsm_stripe_count;
+		     i = (i + 1) % lsm->lsm_stripe_count, j++) {
+			if (!(lov_stripe_intersects(lsm, i, fm_start, fm_end,
+						    &obd_start, &obd_end)))
+				break;
+		}
+		*stripe_count = j;
+		last_stripe = (start_stripe + j - 1) % lsm->lsm_stripe_count;
+	}
+
+	return last_stripe;
+}
+
+/**
+ * Set fe_device and copy extents from local buffer into main return buffer.
+ *
+ * \param fiemap [out]		fiemap to hold all extents
+ * \param lcl_fm_ext [in]	array of fiemap extents get from OSC layer
+ * \param ost_index [in]	OST index to be written into the fm_device
+ *				field for each extent
+ * \param ext_count [in]	number of extents to be copied
+ * \param current_extent [in]	where to start copying in the extent array
+ */
+static void fiemap_prepare_and_copy_exts(struct fiemap *fiemap,
+					 struct fiemap_extent *lcl_fm_ext,
+					 int ost_index, unsigned int ext_count,
+					 int current_extent)
+{
+	unsigned int ext;
+	char *to;
+
+	for (ext = 0; ext < ext_count; ext++) {
+		lcl_fm_ext[ext].fe_device = ost_index;
+		lcl_fm_ext[ext].fe_flags |= FIEMAP_EXTENT_NET;
+	}
+
+	/* Copy fm_extent's from fm_local to return buffer */
+	to = (char *)fiemap + fiemap_count_to_size(current_extent);
+	memcpy(to, lcl_fm_ext, ext_count * sizeof(struct fiemap_extent));
+}
+
+#define FIEMAP_BUFFER_SIZE 4096
+
+/**
+ * Non-zero fe_logical indicates that this is a continuation FIEMAP
+ * call. The local end offset and the device are sent in the first
+ * fm_extent. This function calculates the stripe number from the index.
+ * This function returns a stripe_no on which mapping is to be restarted.
+ *
+ * This function returns fm_end_offset which is the in-OST offset at which
+ * mapping should be restarted. If fm_end_offset=0 is returned then caller
+ * will re-calculate proper offset in next stripe.
+ * Note that the first extent is passed to lov_get_info via the value field.
+ *
+ * \param fiemap [in]		fiemap request header
+ * \param lsm [in]		striping information for the file
+ * \param fm_start [in]		logical start of mapping
+ * \param fm_end [in]		logical end of mapping
+ * \param start_stripe [out]	starting stripe will be returned in this
+ */
+static loff_t fiemap_calc_fm_end_offset(struct fiemap *fiemap,
+					struct lov_stripe_md *lsm,
+					loff_t fm_start, loff_t fm_end,
+					int *start_stripe)
+{
+	loff_t local_end = fiemap->fm_extents[0].fe_logical;
+	loff_t lun_start, lun_end;
+	loff_t fm_end_offset;
+	int stripe_no = -1;
+	int i;
+
+	if (!fiemap->fm_extent_count || !fiemap->fm_extents[0].fe_logical)
+		return 0;
+
+	/* Find out stripe_no from ost_index saved in the fe_device */
+	for (i = 0; i < lsm->lsm_stripe_count; i++) {
+		struct lov_oinfo *oinfo = lsm->lsm_oinfo[i];
+
+		if (lov_oinfo_is_dummy(oinfo))
+			continue;
+
+		if (oinfo->loi_ost_idx == fiemap->fm_extents[0].fe_device) {
+			stripe_no = i;
+			break;
+		}
+	}
+
+	if (stripe_no == -1)
+		return -EINVAL;
+
+	/*
+	 * If we have finished mapping on previous device, shift logical
+	 * offset to start of next device
+	 */
+	if (lov_stripe_intersects(lsm, stripe_no, fm_start, fm_end,
+				  &lun_start, &lun_end) &&
+	    local_end < lun_end) {
+		fm_end_offset = local_end;
+		*start_stripe = stripe_no;
+	} else {
+		/* This is a special value to indicate that caller should
+		 * calculate offset in next stripe.
+		 */
+		fm_end_offset = 0;
+		*start_stripe = (stripe_no + 1) % lsm->lsm_stripe_count;
+	}
+
+	return fm_end_offset;
+}
+
+/**
+ * Break down the FIEMAP request and send appropriate calls to individual OSTs.
+ * This also handles the restarting of FIEMAP calls in case mapping overflows
+ * the available number of extents in single call.
+ *
+ * \param env [in]		lustre environment
+ * \param obj [in]		file object
+ * \param fmkey [in]		fiemap request header and other info
+ * \param fiemap [out]		fiemap buffer holding retrived map extents
+ * \param buflen [in/out]	max buffer length of @fiemap, when iterate
+ *				each OST, it is used to limit max map needed
+ * \retval 0	success
+ * \retval < 0	error
+ */
+static int lov_object_fiemap(const struct lu_env *env, struct cl_object *obj,
+			     struct ll_fiemap_info_key *fmkey,
+			     struct fiemap *fiemap, size_t *buflen)
+{
+	struct lov_obd *lov = lu2lov_dev(obj->co_lu.lo_dev)->ld_lov;
+	unsigned int buffer_size = FIEMAP_BUFFER_SIZE;
+	struct fiemap_extent *lcl_fm_ext;
+	struct cl_object *subobj = NULL;
+	struct fiemap *fm_local = NULL;
+	struct lov_stripe_md *lsm;
+	loff_t fm_start;
+	loff_t fm_end;
+	loff_t fm_length;
+	loff_t fm_end_offset;
+	int count_local;
+	int ost_index = 0;
+	int start_stripe;
+	int current_extent = 0;
+	int rc = 0;
+	int last_stripe;
+	int cur_stripe = 0;
+	int cur_stripe_wrap = 0;
+	int stripe_count;
+	/* Whether have we collected enough extents */
+	bool enough = false;
+	/* EOF for object */
+	bool ost_eof = false;
+	/* done with required mapping for this OST? */
+	bool ost_done = false;
+
+	lsm = lov_lsm_addref(cl2lov(obj));
+	if (!lsm)
+		return -ENODATA;
+
+	/**
+	 * If the stripe_count > 1 and the application does not understand
+	 * DEVICE_ORDER flag, it cannot interpret the extents correctly.
+	 */
+	if (lsm->lsm_stripe_count > 1 &&
+	    !(fiemap->fm_flags & FIEMAP_FLAG_DEVICE_ORDER)) {
+		rc = -ENOTSUPP;
+		goto out;
+	}
+
+	if (lsm_is_released(lsm)) {
+		if (fiemap->fm_start < fmkey->lfik_oa.o_size) {
+			/**
+			 * released file, return a minimal FIEMAP if
+			 * request fits in file-size.
+			 */
+			fiemap->fm_mapped_extents = 1;
+			fiemap->fm_extents[0].fe_logical = fiemap->fm_start;
+			if (fiemap->fm_start + fiemap->fm_length <
+			    fmkey->lfik_oa.o_size)
+				fiemap->fm_extents[0].fe_length =
+					 fiemap->fm_length;
+			else
+				fiemap->fm_extents[0].fe_length =
+					fmkey->lfik_oa.o_size -
+					fiemap->fm_start;
+			fiemap->fm_extents[0].fe_flags |=
+				FIEMAP_EXTENT_UNKNOWN | FIEMAP_EXTENT_LAST;
+		}
+		rc = 0;
+		goto out;
+	}
+
+	if (fiemap_count_to_size(fiemap->fm_extent_count) < buffer_size)
+		buffer_size = fiemap_count_to_size(fiemap->fm_extent_count);
+
+	fm_local = libcfs_kvzalloc(buffer_size, GFP_NOFS);
+	if (!fm_local) {
+		rc = -ENOMEM;
+		goto out;
+	}
+	lcl_fm_ext = &fm_local->fm_extents[0];
+	count_local = fiemap_size_to_count(buffer_size);
+
+	fm_start = fiemap->fm_start;
+	fm_length = fiemap->fm_length;
+	/* Calculate start stripe, last stripe and length of mapping */
+	start_stripe = lov_stripe_number(lsm, fm_start);
+	fm_end = (fm_length == ~0ULL) ? fmkey->lfik_oa.o_size :
+					fm_start + fm_length - 1;
+	/* If fm_length != ~0ULL but fm_start_fm_length-1 exceeds file size */
+	if (fm_end > fmkey->lfik_oa.o_size)
+		fm_end = fmkey->lfik_oa.o_size;
+
+	last_stripe = fiemap_calc_last_stripe(lsm, fm_start, fm_end,
+					      start_stripe, &stripe_count);
+	fm_end_offset = fiemap_calc_fm_end_offset(fiemap, lsm, fm_start, fm_end,
+						  &start_stripe);
+	if (fm_end_offset == -EINVAL) {
+		rc = -EINVAL;
+		goto out;
+	}
+
+	/**
+	 * Requested extent count exceeds the fiemap buffer size, shrink our
+	 * ambition.
+	 */
+	if (fiemap_count_to_size(fiemap->fm_extent_count) > *buflen)
+		fiemap->fm_extent_count = fiemap_size_to_count(*buflen);
+	if (!fiemap->fm_extent_count)
+		count_local = 0;
+
+	/* Check each stripe */
+	for (cur_stripe = start_stripe; stripe_count > 0;
+	     --stripe_count,
+	     cur_stripe = (cur_stripe + 1) % lsm->lsm_stripe_count) {
+		loff_t req_fm_len; /* Stores length of required mapping */
+		loff_t len_mapped_single_call;
+		loff_t lun_start;
+		loff_t lun_end;
+		loff_t obd_object_end;
+		unsigned int ext_count;
+
+		cur_stripe_wrap = cur_stripe;
+
+		/* Find out range of mapping on this stripe */
+		if (!(lov_stripe_intersects(lsm, cur_stripe, fm_start, fm_end,
+					    &lun_start, &obd_object_end)))
+			continue;
+
+		if (lov_oinfo_is_dummy(lsm->lsm_oinfo[cur_stripe])) {
+			rc = -EIO;
+			goto out;
+		}
+
+		/*
+		 * If this is a continuation FIEMAP call and we are on
+		 * starting stripe then lun_start needs to be set to
+		 * fm_end_offset
+		 */
+		if (fm_end_offset && cur_stripe == start_stripe)
+			lun_start = fm_end_offset;
+
+		if (fm_length != ~0ULL) {
+			/* Handle fm_start + fm_length overflow */
+			if (fm_start + fm_length < fm_start)
+				fm_length = ~0ULL - fm_start;
+			lun_end = lov_size_to_stripe(lsm, fm_start + fm_length,
+						     cur_stripe);
+		} else {
+			lun_end = ~0ULL;
+		}
+
+		if (lun_start == lun_end)
+			continue;
+
+		req_fm_len = obd_object_end - lun_start;
+		fm_local->fm_length = 0;
+		len_mapped_single_call = 0;
+
+		/* find lobsub object */
+		subobj = lov_find_subobj(env, cl2lov(obj), lsm,
+					 cur_stripe);
+		if (IS_ERR(subobj)) {
+			rc = PTR_ERR(subobj);
+			goto out;
+		}
+		/*
+		 * If the output buffer is very large and the objects have many
+		 * extents we may need to loop on a single OST repeatedly
+		 */
+		ost_eof = false;
+		ost_done = false;
+		do {
+			if (fiemap->fm_extent_count > 0) {
+				/* Don't get too many extents. */
+				if (current_extent + count_local >
+				    fiemap->fm_extent_count)
+					count_local = fiemap->fm_extent_count -
+						      current_extent;
+			}
+
+			lun_start += len_mapped_single_call;
+			fm_local->fm_length = req_fm_len -
+					      len_mapped_single_call;
+			req_fm_len = fm_local->fm_length;
+			fm_local->fm_extent_count = enough ? 1 : count_local;
+			fm_local->fm_mapped_extents = 0;
+			fm_local->fm_flags = fiemap->fm_flags;
+
+			ost_index = lsm->lsm_oinfo[cur_stripe]->loi_ost_idx;
+
+			if (ost_index < 0 ||
+			    ost_index >= lov->desc.ld_tgt_count) {
+				rc = -EINVAL;
+				goto obj_put;
+			}
+			/*
+			 * If OST is inactive, return extent with UNKNOWN
+			 * flag.
+			 */
+			if (!lov->lov_tgts[ost_index]->ltd_active) {
+				fm_local->fm_flags |= FIEMAP_EXTENT_LAST;
+				fm_local->fm_mapped_extents = 1;
+
+				lcl_fm_ext[0].fe_logical = lun_start;
+				lcl_fm_ext[0].fe_length = obd_object_end -
+							  lun_start;
+				lcl_fm_ext[0].fe_flags |= FIEMAP_EXTENT_UNKNOWN;
+
+				goto inactive_tgt;
+			}
+
+			fm_local->fm_start = lun_start;
+			fm_local->fm_flags &= ~FIEMAP_FLAG_DEVICE_ORDER;
+			memcpy(&fmkey->lfik_fiemap, fm_local, sizeof(*fm_local));
+			*buflen = fiemap_count_to_size(fm_local->fm_extent_count);
+
+			rc = cl_object_fiemap(env, subobj, fmkey, fm_local,
+					      buflen);
+			if (rc)
+				goto obj_put;
+inactive_tgt:
+			ext_count = fm_local->fm_mapped_extents;
+			if (!ext_count) {
+				ost_done = true;
+				/*
+				 * If last stripe has hold at the end,
+				 * we need to return
+				 */
+				if (cur_stripe_wrap == last_stripe) {
+					fiemap->fm_mapped_extents = 0;
+					goto finish;
+				}
+				break;
+			} else if (enough) {
+				/*
+				 * We've collected enough extents and there are
+				 * more extents after it.
+				 */
+				goto finish;
+			}
+
+			/* If we just need num of extents, got to next device */
+			if (!fiemap->fm_extent_count) {
+				current_extent += ext_count;
+				break;
+			}
+
+			/* prepare to copy retrived map extents */
+			len_mapped_single_call =
+				lcl_fm_ext[ext_count - 1].fe_logical -
+				lun_start + lcl_fm_ext[ext_count - 1].fe_length;
+
+			/* Have we finished mapping on this device? */
+			if (req_fm_len <= len_mapped_single_call)
+				ost_done = true;
+
+			/*
+			 * Clear the EXTENT_LAST flag which can be present on
+			 * the last extent
+			 */
+			if (lcl_fm_ext[ext_count - 1].fe_flags &
+			    FIEMAP_EXTENT_LAST)
+				lcl_fm_ext[ext_count - 1].fe_flags &=
+					~FIEMAP_EXTENT_LAST;
+
+			if (lov_stripe_size(lsm,
+					    lcl_fm_ext[ext_count - 1].fe_logical +
+					    lcl_fm_ext[ext_count - 1].fe_length,
+					    cur_stripe) >= fmkey->lfik_oa.o_size)
+				ost_eof = true;
+
+			fiemap_prepare_and_copy_exts(fiemap, lcl_fm_ext,
+						     ost_index, ext_count,
+						     current_extent);
+			current_extent += ext_count;
+
+			/* Ran out of available extents? */
+			if (current_extent >= fiemap->fm_extent_count)
+				enough = true;
+		} while (!ost_done && !ost_eof);
+
+		cl_object_put(env, subobj);
+		subobj = NULL;
+
+		if (cur_stripe_wrap == last_stripe)
+			goto finish;
+	} /* for each stripe */
+finish:
+	/*
+	 * Indicate that we are returning device offsets unless file just has
+	 * single stripe
+	 */
+	if (lsm->lsm_stripe_count > 1)
+		fiemap->fm_flags |= FIEMAP_FLAG_DEVICE_ORDER;
+
+	if (!fiemap->fm_extent_count)
+		goto skip_last_device_calc;
+
+	/*
+	 * Check if we have reached the last stripe and whether mapping for that
+	 * stripe is done.
+	 */
+	if ((cur_stripe_wrap == last_stripe) && (ost_done || ost_eof))
+		fiemap->fm_extents[current_extent - 1].fe_flags |=
+							FIEMAP_EXTENT_LAST;
+skip_last_device_calc:
+	fiemap->fm_mapped_extents = current_extent;
+obj_put:
+	if (subobj)
+		cl_object_put(env, subobj);
+out:
+	kvfree(fm_local);
+	lov_lsm_put(lsm);
+	return rc;
+}
+
 static int lov_object_getstripe(const struct lu_env *env, struct cl_object *obj,
 				struct lov_user_md __user *lum)
 {
@@ -923,10 +1437,53 @@ static int lov_object_getstripe(const struct lu_env *env, struct cl_object *obj,
 		return -ENODATA;
 
 	rc = lov_getstripe(cl2lov(obj), lsm, lum);
-	lov_lsm_put(obj, lsm);
+	lov_lsm_put(lsm);
 	return rc;
 }
 
+static int lov_object_layout_get(const struct lu_env *env,
+				 struct cl_object *obj,
+				 struct cl_layout *cl)
+{
+	struct lov_object *lov = cl2lov(obj);
+	struct lov_stripe_md *lsm = lov_lsm_addref(lov);
+	struct lu_buf *buf = &cl->cl_buf;
+	ssize_t rc;
+
+	if (!lsm) {
+		cl->cl_size = 0;
+		cl->cl_layout_gen = CL_LAYOUT_GEN_EMPTY;
+		cl->cl_is_released = false;
+
+		return 0;
+	}
+
+	cl->cl_size = lov_mds_md_size(lsm->lsm_stripe_count, lsm->lsm_magic);
+	cl->cl_layout_gen = lsm->lsm_layout_gen;
+	cl->cl_is_released = lsm_is_released(lsm);
+
+	rc = lov_lsm_pack(lsm, buf->lb_buf, buf->lb_len);
+	lov_lsm_put(lsm);
+
+	return rc < 0 ? rc : 0;
+}
+
+static loff_t lov_object_maxbytes(struct cl_object *obj)
+{
+	struct lov_object *lov = cl2lov(obj);
+	struct lov_stripe_md *lsm = lov_lsm_addref(lov);
+	loff_t maxbytes;
+
+	if (!lsm)
+		return LLONG_MAX;
+
+	maxbytes = lsm->lsm_maxbytes;
+
+	lov_lsm_put(lsm);
+
+	return maxbytes;
+}
+
 static const struct cl_object_operations lov_ops = {
 	.coo_page_init = lov_page_init,
 	.coo_lock_init = lov_lock_init,
@@ -934,7 +1491,10 @@ static const struct cl_object_operations lov_ops = {
 	.coo_attr_get  = lov_attr_get,
 	.coo_attr_update = lov_attr_update,
 	.coo_conf_set  = lov_conf_set,
-	.coo_getstripe = lov_object_getstripe
+	.coo_getstripe = lov_object_getstripe,
+	.coo_layout_get	 = lov_object_layout_get,
+	.coo_maxbytes	 = lov_object_maxbytes,
+	.coo_fiemap	 = lov_object_fiemap,
 };
 
 static const struct lu_object_operations lov_lu_obj_ops = {
@@ -986,22 +1546,6 @@ struct lov_stripe_md *lov_lsm_addref(struct lov_object *lov)
 	return lsm;
 }
 
-struct lov_stripe_md *lov_lsm_get(struct cl_object *clobj)
-{
-	struct lu_object *luobj;
-	struct lov_stripe_md *lsm = NULL;
-
-	if (!clobj)
-		return NULL;
-
-	luobj = lu_object_locate(&cl_object_header(clobj)->coh_lu,
-				 &lov_device_type);
-	if (luobj)
-		lsm = lov_lsm_addref(lu2lov(luobj));
-	return lsm;
-}
-EXPORT_SYMBOL(lov_lsm_get);
-
 int lov_read_and_clear_async_rc(struct cl_object *clob)
 {
 	struct lu_object *luobj;