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/*
* 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) 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 <linux/libcfs/libcfs.h>
#include <obd_class.h>
#include "lov_internal.h"
/** Merge the lock value block(&lvb) attributes and KMS 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.
*/
int lov_merge_lvb_kms(struct lov_stripe_md *lsm,
struct ost_lvb *lvb, __u64 *kms_place)
{
__u64 size = 0;
__u64 kms = 0;
__u64 blocks = 0;
obd_time current_mtime = lvb->lvb_mtime;
obd_time current_atime = lvb->lvb_atime;
obd_time current_ctime = lvb->lvb_ctime;
int i;
int rc = 0;
assert_spin_locked(&lsm->lsm_lock);
LASSERT(lsm->lsm_lock_owner == current_pid());
CDEBUG(D_INODE, "MDT ID "DOSTID" initial value: s="LPU64" m="LPU64
" a="LPU64" c="LPU64" b="LPU64"\n", POSTID(&lsm->lsm_oi),
lvb->lvb_size, lvb->lvb_mtime, lvb->lvb_atime, lvb->lvb_ctime,
lvb->lvb_blocks);
for (i = 0; i < lsm->lsm_stripe_count; i++) {
struct lov_oinfo *loi = lsm->lsm_oinfo[i];
obd_size lov_size, tmpsize;
if (OST_LVB_IS_ERR(loi->loi_lvb.lvb_blocks)) {
rc = OST_LVB_GET_ERR(loi->loi_lvb.lvb_blocks);
continue;
}
tmpsize = loi->loi_kms;
lov_size = lov_stripe_size(lsm, tmpsize, i);
if (lov_size > kms)
kms = lov_size;
if (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_mtime > current_mtime)
current_mtime = loi->loi_lvb.lvb_mtime;
if (loi->loi_lvb.lvb_atime > current_atime)
current_atime = loi->loi_lvb.lvb_atime;
if (loi->loi_lvb.lvb_ctime > current_ctime)
current_ctime = loi->loi_lvb.lvb_ctime;
CDEBUG(D_INODE, "MDT ID "DOSTID" on OST[%u]: s="LPU64" m="LPU64
" a="LPU64" c="LPU64" b="LPU64"\n", POSTID(&lsm->lsm_oi),
loi->loi_ost_idx, loi->loi_lvb.lvb_size,
loi->loi_lvb.lvb_mtime, loi->loi_lvb.lvb_atime,
loi->loi_lvb.lvb_ctime, loi->loi_lvb.lvb_blocks);
}
*kms_place = kms;
lvb->lvb_size = size;
lvb->lvb_blocks = blocks;
lvb->lvb_mtime = current_mtime;
lvb->lvb_atime = current_atime;
lvb->lvb_ctime = current_ctime;
return rc;
}
/** 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.
*
* If \a 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)
{
int rc;
__u64 kms;
lov_stripe_lock(lsm);
rc = lov_merge_lvb_kms(lsm, lvb, &kms);
lov_stripe_unlock(lsm);
if (kms_only)
lvb->lvb_size = kms;
CDEBUG(D_INODE, "merged for ID "DOSTID" s="LPU64" m="LPU64" a="LPU64
" c="LPU64" b="LPU64"\n", POSTID(&lsm->lsm_oi), lvb->lvb_size,
lvb->lvb_mtime, lvb->lvb_atime, lvb->lvb_ctime, lvb->lvb_blocks);
return rc;
}
/* 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)
{
struct lov_oinfo *loi;
int stripe = 0;
__u64 kms;
assert_spin_locked(&lsm->lsm_lock);
LASSERT(lsm->lsm_lock_owner == current_pid());
if (shrink) {
for (; stripe < lsm->lsm_stripe_count; stripe++) {
struct lov_oinfo *loi = lsm->lsm_oinfo[stripe];
kms = lov_size_to_stripe(lsm, size, stripe);
CDEBUG(D_INODE,
"stripe %d KMS %sing "LPU64"->"LPU64"\n",
stripe, kms > loi->loi_kms ? "increase":"shrink",
loi->loi_kms, kms);
loi_kms_set(loi, loi->loi_lvb.lvb_size = kms);
}
return 0;
}
if (size > 0)
stripe = lov_stripe_number(lsm, size - 1);
kms = lov_size_to_stripe(lsm, size, stripe);
loi = lsm->lsm_oinfo[stripe];
CDEBUG(D_INODE, "stripe %d KMS %sincreasing "LPU64"->"LPU64"\n",
stripe, kms > loi->loi_kms ? "" : "not ", loi->loi_kms, kms);
if (kms > loi->loi_kms)
loi_kms_set(loi, kms);
return 0;
}
void lov_merge_attrs(struct obdo *tgt, struct obdo *src, obd_valid valid,
struct lov_stripe_md *lsm, int stripeno, int *set)
{
valid &= src->o_valid;
if (*set) {
if (valid & OBD_MD_FLSIZE) {
/* this handles sparse files properly */
obd_size lov_size;
lov_size = lov_stripe_size(lsm, src->o_size, stripeno);
if (lov_size > tgt->o_size)
tgt->o_size = lov_size;
}
if (valid & OBD_MD_FLBLOCKS)
tgt->o_blocks += src->o_blocks;
if (valid & OBD_MD_FLBLKSZ)
tgt->o_blksize += src->o_blksize;
if (valid & OBD_MD_FLCTIME && tgt->o_ctime < src->o_ctime)
tgt->o_ctime = src->o_ctime;
if (valid & OBD_MD_FLMTIME && tgt->o_mtime < src->o_mtime)
tgt->o_mtime = src->o_mtime;
if (valid & OBD_MD_FLDATAVERSION)
tgt->o_data_version += src->o_data_version;
} else {
memcpy(tgt, src, sizeof(*tgt));
tgt->o_oi = lsm->lsm_oi;
if (valid & OBD_MD_FLSIZE)
tgt->o_size = lov_stripe_size(lsm, src->o_size,
stripeno);
}
/* data_version needs to be valid on all stripes to be correct! */
if (!(valid & OBD_MD_FLDATAVERSION))
tgt->o_valid &= ~OBD_MD_FLDATAVERSION;
*set += 1;
}
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