*
* Copyright (C) 2002, 2003 Cluster File Systems, Inc.
*
- * This file is part of Lustre, http://www.lustre.org.
+ * This file is part of the Lustre file system, http://www.lustre.org
+ * Lustre is a trademark of Cluster File Systems, Inc.
*
- * Lustre is free software; you can redistribute it and/or
- * modify it under the terms of version 2 of the GNU General Public
- * License as published by the Free Software Foundation.
+ * You may have signed or agreed to another license before downloading
+ * this software. If so, you are bound by the terms and conditions
+ * of that agreement, and the following does not apply to you. See the
+ * LICENSE file included with this distribution for more information.
*
- * Lustre 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 for more details.
+ * If you did not agree to a different license, then this copy of Lustre
+ * is open source software; you can redistribute it and/or modify it
+ * under the terms of version 2 of the GNU General Public License as
+ * published by the Free Software Foundation.
*
- * You should have received a copy of the GNU General Public License
- * along with Lustre; if not, write to the Free Software
- * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ * In either case, Lustre 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
+ * license text for more details.
*/
#ifndef EXPORT_SYMTAB
#define DEBUG_SUBSYSTEM S_LOV
#ifdef __KERNEL__
-#include <asm/div64.h>
+#include <libcfs/libcfs.h>
#else
#include <liblustre.h>
#endif
-#include <linux/obd_class.h>
-#include <linux/obd_lov.h>
+#include <obd_class.h>
+#include <obd_lov.h>
#include "lov_internal.h"
-/* Merge rss if kms == 0
+/* Merge the lock value block(&lvb) attributes from each of the stripes in a
+ * file into a single lvb. It is expected that the caller initializes the
+ * current atime, mtime, ctime to avoid regressing a more uptodate time on
+ * the local client.
*
- * Even when merging RSS, we will take the KMS value if it's larger.
- * This prevents getattr from stomping on dirty cached pages which
- * extend the file size. */
-__u64 lov_merge_size(struct lov_stripe_md *lsm, int kms)
+ * If @kms_only is set then we do not consider the recently seen size (rss)
+ * when updating the known minimum size (kms). Even when merging RSS, we will
+ * take the KMS value if it's larger. This prevents getattr from stomping on
+ * dirty cached pages which extend the file size. */
+int lov_merge_lvb(struct obd_export *exp, struct lov_stripe_md *lsm,
+ struct ost_lvb *lvb, int kms_only)
{
struct lov_oinfo *loi;
__u64 size = 0;
+ __u64 blocks = 0;
+ __u64 current_mtime = lvb->lvb_mtime;
+ __u64 current_atime = lvb->lvb_atime;
+ __u64 current_ctime = lvb->lvb_ctime;
int i;
+ LASSERT_SPIN_LOCKED(&lsm->lsm_lock);
+#ifdef __KERNEL__
+ LASSERT(lsm->lsm_lock_owner == cfs_current());
+#endif
+
for (i = 0, loi = lsm->lsm_oinfo; i < lsm->lsm_stripe_count;
i++, loi++) {
obd_size lov_size, tmpsize;
tmpsize = loi->loi_kms;
- if (kms == 0 && loi->loi_rss > tmpsize)
- tmpsize = loi->loi_rss;
+ if (kms_only == 0 && loi->loi_lvb.lvb_size > tmpsize)
+ tmpsize = loi->loi_lvb.lvb_size;
lov_size = lov_stripe_size(lsm, tmpsize, i);
if (lov_size > size)
size = lov_size;
+ /* merge blocks, mtime, atime */
+ blocks += loi->loi_lvb.lvb_blocks;
+ if (loi->loi_lvb.lvb_atime > current_atime)
+ current_atime = loi->loi_lvb.lvb_atime;
+
+ /* mtime is always updated with ctime, but can be set in past.
+ As write and utime(2) may happen within 1 second, and utime's
+ mtime has a priority over write's one, leave mtime from mds
+ for the same ctimes. */
+ if (loi->loi_lvb.lvb_ctime > current_ctime) {
+ current_ctime = loi->loi_lvb.lvb_ctime;
+ current_mtime = loi->loi_lvb.lvb_mtime;
+ }
}
- return size;
-}
-EXPORT_SYMBOL(lov_merge_size);
-
-/* Merge blocks */
-__u64 lov_merge_blocks(struct lov_stripe_md *lsm)
-{
- struct lov_oinfo *loi;
- __u64 blocks = 0;
- int i;
-
- for (i = 0, loi = lsm->lsm_oinfo; i < lsm->lsm_stripe_count; i++, loi++)
- blocks += loi->loi_blocks;
- return blocks;
-}
-EXPORT_SYMBOL(lov_merge_blocks);
-
-__u64 lov_merge_mtime(struct lov_stripe_md *lsm, __u64 current_time)
-{
- struct lov_oinfo *loi;
- int i;
-
- for (i = 0, loi = lsm->lsm_oinfo; i < lsm->lsm_stripe_count; i++, loi++)
- if (loi->loi_mtime > current_time)
- current_time = loi->loi_mtime;
- return current_time;
+ lvb->lvb_size = size;
+ lvb->lvb_blocks = blocks;
+ lvb->lvb_mtime = current_mtime;
+ lvb->lvb_atime = current_atime;
+ lvb->lvb_ctime = current_ctime;
+ RETURN(0);
}
-EXPORT_SYMBOL(lov_merge_mtime);
+/* Must be called under the lov_stripe_lock() */
int lov_adjust_kms(struct obd_export *exp, struct lov_stripe_md *lsm,
obd_off size, int shrink)
{
__u64 kms;
ENTRY;
+ LASSERT_SPIN_LOCKED(&lsm->lsm_lock);
+#ifdef __KERNEL__
+ LASSERT(lsm->lsm_lock_owner == cfs_current());
+#endif
+
if (shrink) {
struct lov_oinfo *loi;
- int i = 0;
- for (loi = lsm->lsm_oinfo; i < lsm->lsm_stripe_count;
- i++, loi++) {
- kms = lov_size_to_stripe(lsm, size, i);
- loi->loi_kms = loi->loi_rss = kms;
+ for (loi = lsm->lsm_oinfo; stripe < lsm->lsm_stripe_count;
+ stripe++, loi++) {
+ kms = lov_size_to_stripe(lsm, size, stripe);
+ CDEBUG(D_INODE,
+ "stripe %d KMS %sing "LPU64"->"LPU64"\n",
+ stripe, kms > loi->loi_kms ? "increas" :
+ kms < loi->loi_kms ? "shrink" : "leav",
+ loi->loi_kms, kms);
+ loi->loi_kms = loi->loi_lvb.lvb_size = kms;
}
RETURN(0);
}
RETURN(0);
}
-EXPORT_SYMBOL(lov_adjust_kms);
-void lov_merge_attrs(struct obdo *tgt, struct obdo *src, obd_flags valid,
+void lov_merge_attrs(struct obdo *tgt, struct obdo *src, obd_flag valid,
struct lov_stripe_md *lsm, int stripeno, int *set)
{
valid &= src->o_valid;
tgt->o_blksize += src->o_blksize;
if (valid & OBD_MD_FLCTIME && tgt->o_ctime < src->o_ctime)
tgt->o_ctime = src->o_ctime;
+ /* Only mtime from OSTs are merged here, as they cannot be set
+ in past (only MDS's mtime can) do not look at ctime. */
if (valid & OBD_MD_FLMTIME && tgt->o_mtime < src->o_mtime)
tgt->o_mtime = src->o_mtime;
} else {
git://git.whamcloud.com / fs / lustre-release.git / blobdiff