1 /* -*- mode: c; c-basic-offset: 8; indent-tabs-mode: nil; -*-
2 * vim:expandtab:shiftwidth=8:tabstop=8:
6 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License version 2 only,
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12 * This program is distributed in the hope that it will be useful, but
13 * WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * General Public License version 2 for more details (a copy is included
16 * in the LICENSE file that accompanied this code).
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19 * version 2 along with this program; If not, see
20 * http://www.sun.com/software/products/lustre/docs/GPLv2.pdf
22 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
23 * CA 95054 USA or visit www.sun.com if you need additional information or
29 * Copyright 2008 Sun Microsystems, Inc. All rights reserved
30 * Use is subject to license terms.
33 * This file is part of Lustre, http://www.lustre.org/
34 * Lustre is a trademark of Sun Microsystems, Inc.
38 # define EXPORT_SYMTAB
40 #define DEBUG_SUBSYSTEM S_LOV
43 #include <libcfs/libcfs.h>
45 #include <liblustre.h>
48 #include <obd_class.h>
51 #include "lov_internal.h"
53 /* Merge the lock value block(&lvb) attributes from each of the stripes in a
54 * file into a single lvb. It is expected that the caller initializes the
55 * current atime, mtime, ctime to avoid regressing a more uptodate time on
58 * If @kms_only is set then we do not consider the recently seen size (rss)
59 * when updating the known minimum size (kms). Even when merging RSS, we will
60 * take the KMS value if it's larger. This prevents getattr from stomping on
61 * dirty cached pages which extend the file size. */
62 int lov_merge_lvb(struct obd_export *exp, struct lov_stripe_md *lsm,
63 struct ost_lvb *lvb, int kms_only)
67 __u64 current_mtime = lvb->lvb_mtime;
68 __u64 current_atime = lvb->lvb_atime;
69 __u64 current_ctime = lvb->lvb_ctime;
73 LASSERT_SPIN_LOCKED(&lsm->lsm_lock);
75 LASSERT(lsm->lsm_lock_owner == cfs_curproc_pid());
78 for (i = 0; i < lsm->lsm_stripe_count; i++) {
79 struct lov_oinfo *loi = lsm->lsm_oinfo[i];
80 obd_size lov_size, tmpsize;
82 if (OST_LVB_IS_ERR(loi->loi_lvb.lvb_blocks)) {
83 rc = OST_LVB_GET_ERR(loi->loi_lvb.lvb_blocks);
87 tmpsize = loi->loi_kms;
88 if (kms_only == 0 && loi->loi_lvb.lvb_size > tmpsize)
89 tmpsize = loi->loi_lvb.lvb_size;
91 lov_size = lov_stripe_size(lsm, tmpsize, i);
94 /* merge blocks, mtime, atime */
95 blocks += loi->loi_lvb.lvb_blocks;
96 if (loi->loi_lvb.lvb_atime > current_atime)
97 current_atime = loi->loi_lvb.lvb_atime;
99 /* mtime is always updated with ctime, but can be set in past.
100 As write and utime(2) may happen within 1 second, and utime's
101 mtime has a priority over write's one, leave mtime from mds
102 for the same ctimes. */
103 if (loi->loi_lvb.lvb_ctime > current_ctime) {
104 current_ctime = loi->loi_lvb.lvb_ctime;
105 current_mtime = loi->loi_lvb.lvb_mtime;
109 lvb->lvb_size = size;
110 lvb->lvb_blocks = blocks;
111 lvb->lvb_mtime = current_mtime;
112 lvb->lvb_atime = current_atime;
113 lvb->lvb_ctime = current_ctime;
117 /* Must be called under the lov_stripe_lock() */
118 int lov_adjust_kms(struct obd_export *exp, struct lov_stripe_md *lsm,
119 obd_off size, int shrink)
121 struct lov_oinfo *loi;
126 LASSERT_SPIN_LOCKED(&lsm->lsm_lock);
128 LASSERT(lsm->lsm_lock_owner == cfs_curproc_pid());
132 for (; stripe < lsm->lsm_stripe_count; stripe++) {
133 struct lov_oinfo *loi = lsm->lsm_oinfo[stripe];
134 kms = lov_size_to_stripe(lsm, size, stripe);
136 "stripe %d KMS %sing "LPU64"->"LPU64"\n",
137 stripe, kms > loi->loi_kms ? "increas":"shrink",
139 loi_kms_set(loi, loi->loi_lvb.lvb_size = kms);
145 stripe = lov_stripe_number(lsm, size - 1);
146 kms = lov_size_to_stripe(lsm, size, stripe);
147 loi = lsm->lsm_oinfo[stripe];
149 CDEBUG(D_INODE, "stripe %d KMS %sincreasing "LPU64"->"LPU64"\n",
150 stripe, kms > loi->loi_kms ? "" : "not ", loi->loi_kms, kms);
151 if (kms > loi->loi_kms)
152 loi_kms_set(loi, kms);
157 void lov_merge_attrs(struct obdo *tgt, struct obdo *src, obd_flag valid,
158 struct lov_stripe_md *lsm, int stripeno, int *set)
160 valid &= src->o_valid;
163 if (valid & OBD_MD_FLSIZE) {
164 /* this handles sparse files properly */
167 lov_size = lov_stripe_size(lsm, src->o_size, stripeno);
168 if (lov_size > tgt->o_size)
169 tgt->o_size = lov_size;
171 if (valid & OBD_MD_FLBLOCKS)
172 tgt->o_blocks += src->o_blocks;
173 if (valid & OBD_MD_FLBLKSZ)
174 tgt->o_blksize += src->o_blksize;
175 if (valid & OBD_MD_FLCTIME && tgt->o_ctime < src->o_ctime)
176 tgt->o_ctime = src->o_ctime;
177 /* Only mtime from OSTs are merged here, as they cannot be set
178 in past (only MDS's mtime can) do not look at ctime. */
179 if (valid & OBD_MD_FLMTIME && tgt->o_mtime < src->o_mtime)
180 tgt->o_mtime = src->o_mtime;
182 memcpy(tgt, src, sizeof(*tgt));
183 tgt->o_id = lsm->lsm_object_id;
184 if (valid & OBD_MD_FLSIZE)
185 tgt->o_size = lov_stripe_size(lsm,src->o_size,stripeno);