1 files changed, 773 insertions, 0 deletions

diff --git a/drivers/staging/lustre/lustre/lov/lov_request.c b/drivers/staging/lustre/lustre/lov/lov_request.c
new file mode 100644
index 000000000..933e2d1f8
--- /dev/null
+++ b/drivers/staging/lustre/lustre/lov/lov_request.c
@@ -0,0 +1,773 @@
+/*
+ * GPL HEADER START
+ *
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 only,
+ * as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License version 2 for more details (a copy is included
+ * in the LICENSE file that accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License
+ * version 2 along with this program; If not, see
+ * http://www.sun.com/software/products/lustre/docs/GPLv2.pdf
+ *
+ * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
+ * CA 95054 USA or visit www.sun.com if you need additional information or
+ * have any questions.
+ *
+ * GPL HEADER END
+ */
+/*
+ * Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved.
+ * Use is subject to license terms.
+ *
+ * Copyright (c) 2011, 2012, Intel Corporation.
+ */
+/*
+ * This file is part of Lustre, http://www.lustre.org/
+ * Lustre is a trademark of Sun Microsystems, Inc.
+ */
+
+#define DEBUG_SUBSYSTEM S_LOV
+
+#include "../../include/linux/libcfs/libcfs.h"
+
+#include "../include/obd_class.h"
+#include "../include/lustre/lustre_idl.h"
+#include "lov_internal.h"
+
+static void lov_init_set(struct lov_request_set *set)
+{
+	set->set_count = 0;
+	atomic_set(&set->set_completes, 0);
+	atomic_set(&set->set_success, 0);
+	atomic_set(&set->set_finish_checked, 0);
+	set->set_cookies = NULL;
+	INIT_LIST_HEAD(&set->set_list);
+	atomic_set(&set->set_refcount, 1);
+	init_waitqueue_head(&set->set_waitq);
+	spin_lock_init(&set->set_lock);
+}
+
+void lov_finish_set(struct lov_request_set *set)
+{
+	struct list_head *pos, *n;
+
+	LASSERT(set);
+	list_for_each_safe(pos, n, &set->set_list) {
+		struct lov_request *req = list_entry(pos,
+							 struct lov_request,
+							 rq_link);
+		list_del_init(&req->rq_link);
+
+		if (req->rq_oi.oi_oa)
+			OBDO_FREE(req->rq_oi.oi_oa);
+		if (req->rq_oi.oi_md)
+			OBD_FREE_LARGE(req->rq_oi.oi_md, req->rq_buflen);
+		if (req->rq_oi.oi_osfs)
+			OBD_FREE(req->rq_oi.oi_osfs,
+				 sizeof(*req->rq_oi.oi_osfs));
+		OBD_FREE(req, sizeof(*req));
+	}
+
+	if (set->set_pga) {
+		int len = set->set_oabufs * sizeof(*set->set_pga);
+		OBD_FREE_LARGE(set->set_pga, len);
+	}
+	if (set->set_lockh)
+		lov_llh_put(set->set_lockh);
+
+	OBD_FREE(set, sizeof(*set));
+}
+
+int lov_set_finished(struct lov_request_set *set, int idempotent)
+{
+	int completes = atomic_read(&set->set_completes);
+
+	CDEBUG(D_INFO, "check set %d/%d\n", completes, set->set_count);
+
+	if (completes == set->set_count) {
+		if (idempotent)
+			return 1;
+		if (atomic_inc_return(&set->set_finish_checked) == 1)
+			return 1;
+	}
+	return 0;
+}
+
+void lov_update_set(struct lov_request_set *set,
+		    struct lov_request *req, int rc)
+{
+	req->rq_complete = 1;
+	req->rq_rc = rc;
+
+	atomic_inc(&set->set_completes);
+	if (rc == 0)
+		atomic_inc(&set->set_success);
+
+	wake_up(&set->set_waitq);
+}
+
+int lov_update_common_set(struct lov_request_set *set,
+			  struct lov_request *req, int rc)
+{
+	struct lov_obd *lov = &set->set_exp->exp_obd->u.lov;
+
+	lov_update_set(set, req, rc);
+
+	/* grace error on inactive ost */
+	if (rc && !(lov->lov_tgts[req->rq_idx] &&
+		    lov->lov_tgts[req->rq_idx]->ltd_active))
+		rc = 0;
+
+	/* FIXME in raid1 regime, should return 0 */
+	return rc;
+}
+
+void lov_set_add_req(struct lov_request *req, struct lov_request_set *set)
+{
+	list_add_tail(&req->rq_link, &set->set_list);
+	set->set_count++;
+	req->rq_rqset = set;
+}
+
+static int lov_check_set(struct lov_obd *lov, int idx)
+{
+	int rc;
+	struct lov_tgt_desc *tgt;
+
+	mutex_lock(&lov->lov_lock);
+	tgt = lov->lov_tgts[idx];
+	rc = !tgt || tgt->ltd_active ||
+		(tgt->ltd_exp &&
+		 class_exp2cliimp(tgt->ltd_exp)->imp_connect_tried);
+	mutex_unlock(&lov->lov_lock);
+
+	return rc;
+}
+
+/* Check if the OSC connection exists and is active.
+ * If the OSC has not yet had a chance to connect to the OST the first time,
+ * wait once for it to connect instead of returning an error.
+ */
+int lov_check_and_wait_active(struct lov_obd *lov, int ost_idx)
+{
+	wait_queue_head_t waitq;
+	struct l_wait_info lwi;
+	struct lov_tgt_desc *tgt;
+	int rc = 0;
+
+	mutex_lock(&lov->lov_lock);
+
+	tgt = lov->lov_tgts[ost_idx];
+
+	if (unlikely(tgt == NULL)) {
+		rc = 0;
+		goto out;
+	}
+
+	if (likely(tgt->ltd_active)) {
+		rc = 1;
+		goto out;
+	}
+
+	if (tgt->ltd_exp && class_exp2cliimp(tgt->ltd_exp)->imp_connect_tried) {
+		rc = 0;
+		goto out;
+	}
+
+	mutex_unlock(&lov->lov_lock);
+
+	init_waitqueue_head(&waitq);
+	lwi = LWI_TIMEOUT_INTERVAL(cfs_time_seconds(obd_timeout),
+				   cfs_time_seconds(1), NULL, NULL);
+
+	rc = l_wait_event(waitq, lov_check_set(lov, ost_idx), &lwi);
+	if (tgt != NULL && tgt->ltd_active)
+		return 1;
+
+	return 0;
+
+out:
+	mutex_unlock(&lov->lov_lock);
+	return rc;
+}
+
+static int common_attr_done(struct lov_request_set *set)
+{
+	struct list_head *pos;
+	struct lov_request *req;
+	struct obdo *tmp_oa;
+	int rc = 0, attrset = 0;
+
+	LASSERT(set->set_oi != NULL);
+
+	if (set->set_oi->oi_oa == NULL)
+		return 0;
+
+	if (!atomic_read(&set->set_success))
+		return -EIO;
+
+	OBDO_ALLOC(tmp_oa);
+	if (tmp_oa == NULL) {
+		rc = -ENOMEM;
+		goto out;
+	}
+
+	list_for_each(pos, &set->set_list) {
+		req = list_entry(pos, struct lov_request, rq_link);
+
+		if (!req->rq_complete || req->rq_rc)
+			continue;
+		if (req->rq_oi.oi_oa->o_valid == 0)   /* inactive stripe */
+			continue;
+		lov_merge_attrs(tmp_oa, req->rq_oi.oi_oa,
+				req->rq_oi.oi_oa->o_valid,
+				set->set_oi->oi_md, req->rq_stripe, &attrset);
+	}
+	if (!attrset) {
+		CERROR("No stripes had valid attrs\n");
+		rc = -EIO;
+	}
+	if ((set->set_oi->oi_oa->o_valid & OBD_MD_FLEPOCH) &&
+	    (set->set_oi->oi_md->lsm_stripe_count != attrset)) {
+		/* When we take attributes of some epoch, we require all the
+		 * ost to be active. */
+		CERROR("Not all the stripes had valid attrs\n");
+		rc = -EIO;
+		goto out;
+	}
+
+	tmp_oa->o_oi = set->set_oi->oi_oa->o_oi;
+	memcpy(set->set_oi->oi_oa, tmp_oa, sizeof(*set->set_oi->oi_oa));
+out:
+	if (tmp_oa)
+		OBDO_FREE(tmp_oa);
+	return rc;
+
+}
+
+int lov_fini_getattr_set(struct lov_request_set *set)
+{
+	int rc = 0;
+
+	if (set == NULL)
+		return 0;
+	LASSERT(set->set_exp);
+	if (atomic_read(&set->set_completes))
+		rc = common_attr_done(set);
+
+	lov_put_reqset(set);
+
+	return rc;
+}
+
+/* The callback for osc_getattr_async that finalizes a request info when a
+ * response is received. */
+static int cb_getattr_update(void *cookie, int rc)
+{
+	struct obd_info *oinfo = cookie;
+	struct lov_request *lovreq;
+
+	lovreq = container_of(oinfo, struct lov_request, rq_oi);
+	return lov_update_common_set(lovreq->rq_rqset, lovreq, rc);
+}
+
+int lov_prep_getattr_set(struct obd_export *exp, struct obd_info *oinfo,
+			 struct lov_request_set **reqset)
+{
+	struct lov_request_set *set;
+	struct lov_obd *lov = &exp->exp_obd->u.lov;
+	int rc = 0, i;
+
+	OBD_ALLOC(set, sizeof(*set));
+	if (set == NULL)
+		return -ENOMEM;
+	lov_init_set(set);
+
+	set->set_exp = exp;
+	set->set_oi = oinfo;
+
+	for (i = 0; i < oinfo->oi_md->lsm_stripe_count; i++) {
+		struct lov_oinfo *loi;
+		struct lov_request *req;
+
+		loi = oinfo->oi_md->lsm_oinfo[i];
+		if (lov_oinfo_is_dummy(loi))
+			continue;
+
+		if (!lov_check_and_wait_active(lov, loi->loi_ost_idx)) {
+			CDEBUG(D_HA, "lov idx %d inactive\n", loi->loi_ost_idx);
+			if (oinfo->oi_oa->o_valid & OBD_MD_FLEPOCH) {
+				/* SOM requires all the OSTs to be active. */
+				rc = -EIO;
+				goto out_set;
+			}
+			continue;
+		}
+
+		OBD_ALLOC(req, sizeof(*req));
+		if (req == NULL) {
+			rc = -ENOMEM;
+			goto out_set;
+		}
+
+		req->rq_stripe = i;
+		req->rq_idx = loi->loi_ost_idx;
+
+		OBDO_ALLOC(req->rq_oi.oi_oa);
+		if (req->rq_oi.oi_oa == NULL) {
+			OBD_FREE(req, sizeof(*req));
+			rc = -ENOMEM;
+			goto out_set;
+		}
+		memcpy(req->rq_oi.oi_oa, oinfo->oi_oa,
+		       sizeof(*req->rq_oi.oi_oa));
+		req->rq_oi.oi_oa->o_oi = loi->loi_oi;
+		req->rq_oi.oi_cb_up = cb_getattr_update;
+		req->rq_oi.oi_capa = oinfo->oi_capa;
+
+		lov_set_add_req(req, set);
+	}
+	if (!set->set_count) {
+		rc = -EIO;
+		goto out_set;
+	}
+	*reqset = set;
+	return rc;
+out_set:
+	lov_fini_getattr_set(set);
+	return rc;
+}
+
+int lov_fini_destroy_set(struct lov_request_set *set)
+{
+	if (set == NULL)
+		return 0;
+	LASSERT(set->set_exp);
+	if (atomic_read(&set->set_completes)) {
+		/* FIXME update qos data here */
+	}
+
+	lov_put_reqset(set);
+
+	return 0;
+}
+
+int lov_prep_destroy_set(struct obd_export *exp, struct obd_info *oinfo,
+			 struct obdo *src_oa, struct lov_stripe_md *lsm,
+			 struct obd_trans_info *oti,
+			 struct lov_request_set **reqset)
+{
+	struct lov_request_set *set;
+	struct lov_obd *lov = &exp->exp_obd->u.lov;
+	int rc = 0, i;
+
+	OBD_ALLOC(set, sizeof(*set));
+	if (set == NULL)
+		return -ENOMEM;
+	lov_init_set(set);
+
+	set->set_exp = exp;
+	set->set_oi = oinfo;
+	set->set_oi->oi_md = lsm;
+	set->set_oi->oi_oa = src_oa;
+	set->set_oti = oti;
+	if (oti != NULL && src_oa->o_valid & OBD_MD_FLCOOKIE)
+		set->set_cookies = oti->oti_logcookies;
+
+	for (i = 0; i < lsm->lsm_stripe_count; i++) {
+		struct lov_oinfo *loi;
+		struct lov_request *req;
+
+		loi = lsm->lsm_oinfo[i];
+		if (lov_oinfo_is_dummy(loi))
+			continue;
+
+		if (!lov_check_and_wait_active(lov, loi->loi_ost_idx)) {
+			CDEBUG(D_HA, "lov idx %d inactive\n", loi->loi_ost_idx);
+			continue;
+		}
+
+		OBD_ALLOC(req, sizeof(*req));
+		if (req == NULL) {
+			rc = -ENOMEM;
+			goto out_set;
+		}
+
+		req->rq_stripe = i;
+		req->rq_idx = loi->loi_ost_idx;
+
+		OBDO_ALLOC(req->rq_oi.oi_oa);
+		if (req->rq_oi.oi_oa == NULL) {
+			OBD_FREE(req, sizeof(*req));
+			rc = -ENOMEM;
+			goto out_set;
+		}
+		memcpy(req->rq_oi.oi_oa, src_oa, sizeof(*req->rq_oi.oi_oa));
+		req->rq_oi.oi_oa->o_oi = loi->loi_oi;
+		lov_set_add_req(req, set);
+	}
+	if (!set->set_count) {
+		rc = -EIO;
+		goto out_set;
+	}
+	*reqset = set;
+	return rc;
+out_set:
+	lov_fini_destroy_set(set);
+	return rc;
+}
+
+int lov_fini_setattr_set(struct lov_request_set *set)
+{
+	int rc = 0;
+
+	if (set == NULL)
+		return 0;
+	LASSERT(set->set_exp);
+	if (atomic_read(&set->set_completes)) {
+		rc = common_attr_done(set);
+		/* FIXME update qos data here */
+	}
+
+	lov_put_reqset(set);
+	return rc;
+}
+
+int lov_update_setattr_set(struct lov_request_set *set,
+			   struct lov_request *req, int rc)
+{
+	struct lov_obd *lov = &req->rq_rqset->set_exp->exp_obd->u.lov;
+	struct lov_stripe_md *lsm = req->rq_rqset->set_oi->oi_md;
+
+	lov_update_set(set, req, rc);
+
+	/* grace error on inactive ost */
+	if (rc && !(lov->lov_tgts[req->rq_idx] &&
+		    lov->lov_tgts[req->rq_idx]->ltd_active))
+		rc = 0;
+
+	if (rc == 0) {
+		if (req->rq_oi.oi_oa->o_valid & OBD_MD_FLCTIME)
+			lsm->lsm_oinfo[req->rq_stripe]->loi_lvb.lvb_ctime =
+				req->rq_oi.oi_oa->o_ctime;
+		if (req->rq_oi.oi_oa->o_valid & OBD_MD_FLMTIME)
+			lsm->lsm_oinfo[req->rq_stripe]->loi_lvb.lvb_mtime =
+				req->rq_oi.oi_oa->o_mtime;
+		if (req->rq_oi.oi_oa->o_valid & OBD_MD_FLATIME)
+			lsm->lsm_oinfo[req->rq_stripe]->loi_lvb.lvb_atime =
+				req->rq_oi.oi_oa->o_atime;
+	}
+
+	return rc;
+}
+
+/* The callback for osc_setattr_async that finalizes a request info when a
+ * response is received. */
+static int cb_setattr_update(void *cookie, int rc)
+{
+	struct obd_info *oinfo = cookie;
+	struct lov_request *lovreq;
+
+	lovreq = container_of(oinfo, struct lov_request, rq_oi);
+	return lov_update_setattr_set(lovreq->rq_rqset, lovreq, rc);
+}
+
+int lov_prep_setattr_set(struct obd_export *exp, struct obd_info *oinfo,
+			 struct obd_trans_info *oti,
+			 struct lov_request_set **reqset)
+{
+	struct lov_request_set *set;
+	struct lov_obd *lov = &exp->exp_obd->u.lov;
+	int rc = 0, i;
+
+	OBD_ALLOC(set, sizeof(*set));
+	if (set == NULL)
+		return -ENOMEM;
+	lov_init_set(set);
+
+	set->set_exp = exp;
+	set->set_oti = oti;
+	set->set_oi = oinfo;
+	if (oti != NULL && oinfo->oi_oa->o_valid & OBD_MD_FLCOOKIE)
+		set->set_cookies = oti->oti_logcookies;
+
+	for (i = 0; i < oinfo->oi_md->lsm_stripe_count; i++) {
+		struct lov_oinfo *loi = oinfo->oi_md->lsm_oinfo[i];
+		struct lov_request *req;
+
+		if (lov_oinfo_is_dummy(loi))
+			continue;
+
+		if (!lov_check_and_wait_active(lov, loi->loi_ost_idx)) {
+			CDEBUG(D_HA, "lov idx %d inactive\n", loi->loi_ost_idx);
+			continue;
+		}
+
+		OBD_ALLOC(req, sizeof(*req));
+		if (req == NULL) {
+			rc = -ENOMEM;
+			goto out_set;
+		}
+		req->rq_stripe = i;
+		req->rq_idx = loi->loi_ost_idx;
+
+		OBDO_ALLOC(req->rq_oi.oi_oa);
+		if (req->rq_oi.oi_oa == NULL) {
+			OBD_FREE(req, sizeof(*req));
+			rc = -ENOMEM;
+			goto out_set;
+		}
+		memcpy(req->rq_oi.oi_oa, oinfo->oi_oa,
+		       sizeof(*req->rq_oi.oi_oa));
+		req->rq_oi.oi_oa->o_oi = loi->loi_oi;
+		req->rq_oi.oi_oa->o_stripe_idx = i;
+		req->rq_oi.oi_cb_up = cb_setattr_update;
+		req->rq_oi.oi_capa = oinfo->oi_capa;
+
+		if (oinfo->oi_oa->o_valid & OBD_MD_FLSIZE) {
+			int off = lov_stripe_offset(oinfo->oi_md,
+						    oinfo->oi_oa->o_size, i,
+						    &req->rq_oi.oi_oa->o_size);
+
+			if (off < 0 && req->rq_oi.oi_oa->o_size)
+				req->rq_oi.oi_oa->o_size--;
+
+			CDEBUG(D_INODE, "stripe %d has size %llu/%llu\n",
+			       i, req->rq_oi.oi_oa->o_size,
+			       oinfo->oi_oa->o_size);
+		}
+		lov_set_add_req(req, set);
+	}
+	if (!set->set_count) {
+		rc = -EIO;
+		goto out_set;
+	}
+	*reqset = set;
+	return rc;
+out_set:
+	lov_fini_setattr_set(set);
+	return rc;
+}
+
+#define LOV_U64_MAX ((__u64)~0ULL)
+#define LOV_SUM_MAX(tot, add)					   \
+	do {							    \
+		if ((tot) + (add) < (tot))			      \
+			(tot) = LOV_U64_MAX;			    \
+		else						    \
+			(tot) += (add);				 \
+	} while (0)
+
+int lov_fini_statfs(struct obd_device *obd, struct obd_statfs *osfs,
+		    int success)
+{
+	if (success) {
+		__u32 expected_stripes = lov_get_stripecnt(&obd->u.lov,
+							   LOV_MAGIC, 0);
+		if (osfs->os_files != LOV_U64_MAX)
+			lov_do_div64(osfs->os_files, expected_stripes);
+		if (osfs->os_ffree != LOV_U64_MAX)
+			lov_do_div64(osfs->os_ffree, expected_stripes);
+
+		spin_lock(&obd->obd_osfs_lock);
+		memcpy(&obd->obd_osfs, osfs, sizeof(*osfs));
+		obd->obd_osfs_age = cfs_time_current_64();
+		spin_unlock(&obd->obd_osfs_lock);
+		return 0;
+	}
+
+	return -EIO;
+}
+
+int lov_fini_statfs_set(struct lov_request_set *set)
+{
+	int rc = 0;
+
+	if (set == NULL)
+		return 0;
+
+	if (atomic_read(&set->set_completes)) {
+		rc = lov_fini_statfs(set->set_obd, set->set_oi->oi_osfs,
+				     atomic_read(&set->set_success));
+	}
+	lov_put_reqset(set);
+	return rc;
+}
+
+void lov_update_statfs(struct obd_statfs *osfs, struct obd_statfs *lov_sfs,
+		       int success)
+{
+	int shift = 0, quit = 0;
+	__u64 tmp;
+
+	if (success == 0) {
+		memcpy(osfs, lov_sfs, sizeof(*lov_sfs));
+	} else {
+		if (osfs->os_bsize != lov_sfs->os_bsize) {
+			/* assume all block sizes are always powers of 2 */
+			/* get the bits difference */
+			tmp = osfs->os_bsize | lov_sfs->os_bsize;
+			for (shift = 0; shift <= 64; ++shift) {
+				if (tmp & 1) {
+					if (quit)
+						break;
+					else
+						quit = 1;
+					shift = 0;
+				}
+				tmp >>= 1;
+			}
+		}
+
+		if (osfs->os_bsize < lov_sfs->os_bsize) {
+			osfs->os_bsize = lov_sfs->os_bsize;
+
+			osfs->os_bfree  >>= shift;
+			osfs->os_bavail >>= shift;
+			osfs->os_blocks >>= shift;
+		} else if (shift != 0) {
+			lov_sfs->os_bfree  >>= shift;
+			lov_sfs->os_bavail >>= shift;
+			lov_sfs->os_blocks >>= shift;
+		}
+		osfs->os_bfree += lov_sfs->os_bfree;
+		osfs->os_bavail += lov_sfs->os_bavail;
+		osfs->os_blocks += lov_sfs->os_blocks;
+		/* XXX not sure about this one - depends on policy.
+		 *   - could be minimum if we always stripe on all OBDs
+		 *     (but that would be wrong for any other policy,
+		 *     if one of the OBDs has no more objects left)
+		 *   - could be sum if we stripe whole objects
+		 *   - could be average, just to give a nice number
+		 *
+		 * To give a "reasonable" (if not wholly accurate)
+		 * number, we divide the total number of free objects
+		 * by expected stripe count (watch out for overflow).
+		 */
+		LOV_SUM_MAX(osfs->os_files, lov_sfs->os_files);
+		LOV_SUM_MAX(osfs->os_ffree, lov_sfs->os_ffree);
+	}
+}
+
+/* The callback for osc_statfs_async that finalizes a request info when a
+ * response is received. */
+static int cb_statfs_update(void *cookie, int rc)
+{
+	struct obd_info *oinfo = cookie;
+	struct lov_request *lovreq;
+	struct lov_request_set *set;
+	struct obd_statfs *osfs, *lov_sfs;
+	struct lov_obd *lov;
+	struct lov_tgt_desc *tgt;
+	struct obd_device *lovobd, *tgtobd;
+	int success;
+
+	lovreq = container_of(oinfo, struct lov_request, rq_oi);
+	set = lovreq->rq_rqset;
+	lovobd = set->set_obd;
+	lov = &lovobd->u.lov;
+	osfs = set->set_oi->oi_osfs;
+	lov_sfs = oinfo->oi_osfs;
+	success = atomic_read(&set->set_success);
+	/* XXX: the same is done in lov_update_common_set, however
+	   lovset->set_exp is not initialized. */
+	lov_update_set(set, lovreq, rc);
+	if (rc)
+		goto out;
+
+	obd_getref(lovobd);
+	tgt = lov->lov_tgts[lovreq->rq_idx];
+	if (!tgt || !tgt->ltd_active)
+		goto out_update;
+
+	tgtobd = class_exp2obd(tgt->ltd_exp);
+	spin_lock(&tgtobd->obd_osfs_lock);
+	memcpy(&tgtobd->obd_osfs, lov_sfs, sizeof(*lov_sfs));
+	if ((oinfo->oi_flags & OBD_STATFS_FROM_CACHE) == 0)
+		tgtobd->obd_osfs_age = cfs_time_current_64();
+	spin_unlock(&tgtobd->obd_osfs_lock);
+
+out_update:
+	lov_update_statfs(osfs, lov_sfs, success);
+	obd_putref(lovobd);
+
+out:
+	if (set->set_oi->oi_flags & OBD_STATFS_PTLRPCD &&
+	    lov_set_finished(set, 0)) {
+		lov_statfs_interpret(NULL, set, set->set_count !=
+				     atomic_read(&set->set_success));
+	}
+
+	return 0;
+}
+
+int lov_prep_statfs_set(struct obd_device *obd, struct obd_info *oinfo,
+			struct lov_request_set **reqset)
+{
+	struct lov_request_set *set;
+	struct lov_obd *lov = &obd->u.lov;
+	int rc = 0, i;
+
+	OBD_ALLOC(set, sizeof(*set));
+	if (set == NULL)
+		return -ENOMEM;
+	lov_init_set(set);
+
+	set->set_obd = obd;
+	set->set_oi = oinfo;
+
+	/* We only get block data from the OBD */
+	for (i = 0; i < lov->desc.ld_tgt_count; i++) {
+		struct lov_request *req;
+
+		if (lov->lov_tgts[i] == NULL ||
+		    (!lov_check_and_wait_active(lov, i) &&
+		     (oinfo->oi_flags & OBD_STATFS_NODELAY))) {
+			CDEBUG(D_HA, "lov idx %d inactive\n", i);
+			continue;
+		}
+
+		/* skip targets that have been explicitly disabled by the
+		 * administrator */
+		if (!lov->lov_tgts[i]->ltd_exp) {
+			CDEBUG(D_HA, "lov idx %d administratively disabled\n", i);
+			continue;
+		}
+
+		OBD_ALLOC(req, sizeof(*req));
+		if (req == NULL) {
+			rc = -ENOMEM;
+			goto out_set;
+		}
+
+		OBD_ALLOC(req->rq_oi.oi_osfs, sizeof(*req->rq_oi.oi_osfs));
+		if (req->rq_oi.oi_osfs == NULL) {
+			OBD_FREE(req, sizeof(*req));
+			rc = -ENOMEM;
+			goto out_set;
+		}
+
+		req->rq_idx = i;
+		req->rq_oi.oi_cb_up = cb_statfs_update;
+		req->rq_oi.oi_flags = oinfo->oi_flags;
+
+		lov_set_add_req(req, set);
+	}
+	if (!set->set_count) {
+		rc = -EIO;
+		goto out_set;
+	}
+	*reqset = set;
+	return rc;
+out_set:
+	lov_fini_statfs_set(set);
+	return rc;
+}