1 /* -*- mode: c; c-basic-offset: 8; indent-tabs-mode: nil; -*-
2 * vim:expandtab:shiftwidth=8:tabstop=8:
4 * linux/fs/obdfilter/filter_log.c
6 * Copyright (c) 2001-2003 Cluster File Systems, Inc.
7 * Author: Peter Braam <braam@clusterfs.com>
8 * Author: Andreas Dilger <adilger@clusterfs.com>
9 * Author: Phil Schwan <phil@clusterfs.com>
11 * This file is part of Lustre, http://www.lustre.org.
13 * Lustre is free software; you can redistribute it and/or
14 * modify it under the terms of version 2 of the GNU General Public
15 * License as published by the Free Software Foundation.
17 * Lustre is distributed in the hope that it will be useful,
18 * but WITHOUT ANY WARRANTY; without even the implied warranty of
19 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
20 * GNU General Public License for more details.
22 * You should have received a copy of the GNU General Public License
23 * along with Lustre; if not, write to the Free Software
24 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
27 #define DEBUG_SUBSYSTEM S_FILTER
29 #include <linux/config.h>
30 #include <linux/module.h>
31 #include <linux/version.h>
33 #include <libcfs/list.h>
34 #include <linux/obd_class.h>
35 #include <linux/lustre_dlm.h>
37 #include "filter_internal.h"
39 /* Called with res->lr_lvb_sem held */
40 static int filter_lvbo_init(struct ldlm_resource *res)
42 struct ost_lvb *lvb = NULL;
43 struct filter_obd *filter;
44 struct obd_device *obd;
45 struct dentry *dentry;
51 LASSERT(down_trylock(&res->lr_lvb_sem) != 0);
53 /* we only want lvb's for object resources */
54 /* check for internal locks: these have name[1] != 0 */
55 if (res->lr_name.name[1])
61 OBD_ALLOC(lvb, sizeof(*lvb));
63 GOTO(out, rc = -ENOMEM);
65 res->lr_lvb_data = lvb;
66 res->lr_lvb_len = sizeof(*lvb);
68 obd = res->lr_namespace->ns_lvbp;
69 filter = &obd->u.filter;
72 oid = res->lr_name.name[0];
73 ogr = res->lr_name.name[2];
75 dentry = filter_id2dentry(obd, NULL, ogr, oid);
77 GOTO(out, rc = PTR_ERR(dentry));
79 if (dentry->d_inode == NULL) {
83 /* making client use MDS mtime as this one is zero, bigger one
84 * will be taken and this does not break POSIX. Thanks to
88 lvb->lvb_size = dentry->d_inode->i_size;
89 lvb->lvb_blocks = dentry->d_inode->i_blocks;
90 lvb->lvb_mtime = LTIME_S(dentry->d_inode->i_mtime);
93 CDEBUG(D_DLMTRACE, "res: "LPU64" initial lvb size: "LPU64", "
94 "mtime: "LPU64", blocks: "LPU64"\n", res->lr_name.name[0],
95 lvb->lvb_size, lvb->lvb_mtime, lvb->lvb_blocks);
100 /* don't free lvb data on lookup error */
104 /* This will be called in two ways:
106 * m != NULL : called by the DLM itself after a glimpse callback
107 * m == NULL : called by the filter after a disk write
109 * If 'increase' is true, don't allow values to move backwards.
111 static int filter_lvbo_update(struct ldlm_resource *res, struct lustre_msg *m,
112 int buf_idx, int increase)
114 struct ost_lvb *lvb = res->lr_lvb_data;
115 struct obd_device *obd;
116 struct obdo *oa = NULL;
117 struct dentry *dentry;
123 /* we only want lvb's for object resources */
124 /* check for internal locks: these have name[1] != 0 */
125 if (res->lr_name.name[1])
128 down(&res->lr_lvb_sem);
129 if (!res->lr_lvb_data) {
130 CERROR("No lvb when running lvbo_update!\n");
134 /* Update the LVB from the network message */
138 new = lustre_swab_buf(m, buf_idx, sizeof(*new),
139 lustre_swab_ost_lvb);
141 CERROR("lustre_swab_buf failed\n");
142 //GOTO(out, rc = -EPROTO);
147 if (new->lvb_size > lvb->lvb_size || !increase) {
148 CDEBUG(D_DLMTRACE, "res: "LPU64" updating lvb size: "
149 LPU64" -> "LPU64"\n", res->lr_name.name[0],
150 lvb->lvb_size, new->lvb_size);
151 lvb->lvb_size = new->lvb_size;
153 if (new->lvb_mtime > lvb->lvb_mtime || !increase) {
154 CDEBUG(D_DLMTRACE, "res: "LPU64" updating lvb mtime: "
155 LPU64" -> "LPU64"\n", res->lr_name.name[0],
156 lvb->lvb_mtime, new->lvb_mtime);
157 lvb->lvb_mtime = new->lvb_mtime;
159 if (new->lvb_atime > lvb->lvb_atime || !increase) {
160 CDEBUG(D_DLMTRACE, "res: "LPU64" updating lvb atime: "
161 LPU64" -> "LPU64"\n", res->lr_name.name[0],
162 lvb->lvb_atime, new->lvb_atime);
163 lvb->lvb_atime = new->lvb_atime;
165 if (new->lvb_ctime > lvb->lvb_ctime || !increase) {
166 CDEBUG(D_DLMTRACE, "res: "LPU64" updating lvb ctime: "
167 LPU64" -> "LPU64"\n", res->lr_name.name[0],
168 lvb->lvb_ctime, new->lvb_ctime);
169 lvb->lvb_ctime = new->lvb_ctime;
174 /* Update the LVB from the disk inode */
175 obd = res->lr_namespace->ns_lvbp;
180 GOTO(out, rc = -ENOMEM);
182 oa->o_id = res->lr_name.name[0];
183 oa->o_gr = res->lr_name.name[2];
184 oa->o_valid = OBD_MD_FLID | OBD_MD_FLGROUP;
185 dentry = filter_oa2dentry(obd, oa);
187 GOTO(out, rc = PTR_ERR(dentry));
189 /* Limit the valid bits in the return data to what we actually use */
190 oa->o_valid = OBD_MD_FLID | OBD_MD_FLGROUP;
191 obdo_from_inode(oa, dentry->d_inode, FILTER_VALID_FLAGS);
194 if (dentry->d_inode->i_size > lvb->lvb_size || !increase) {
195 CDEBUG(D_DLMTRACE, "res: "LPU64" updating lvb size from disk: "
196 LPU64" -> %llu\n", res->lr_name.name[0],
197 lvb->lvb_size, dentry->d_inode->i_size);
198 lvb->lvb_size = dentry->d_inode->i_size;
201 if (LTIME_S(dentry->d_inode->i_mtime) > lvb->lvb_mtime || !increase) {
202 CDEBUG(D_DLMTRACE, "res: "LPU64" updating lvb mtime from disk: "
203 LPU64" -> %lu\n", res->lr_name.name[0],
204 lvb->lvb_mtime, LTIME_S(dentry->d_inode->i_mtime));
205 lvb->lvb_mtime = LTIME_S(dentry->d_inode->i_mtime);
207 if (LTIME_S(dentry->d_inode->i_atime) > lvb->lvb_atime || !increase) {
208 CDEBUG(D_DLMTRACE, "res: "LPU64" updating lvb atime from disk: "
209 LPU64" -> %lu\n", res->lr_name.name[0],
210 lvb->lvb_atime, LTIME_S(dentry->d_inode->i_atime));
211 lvb->lvb_atime = LTIME_S(dentry->d_inode->i_atime);
213 if (LTIME_S(dentry->d_inode->i_ctime) > lvb->lvb_ctime || !increase) {
214 CDEBUG(D_DLMTRACE, "res: "LPU64" updating lvb ctime from disk: "
215 LPU64" -> %lu\n", res->lr_name.name[0],
216 lvb->lvb_ctime, LTIME_S(dentry->d_inode->i_ctime));
217 lvb->lvb_ctime = LTIME_S(dentry->d_inode->i_ctime);
219 CDEBUG(D_DLMTRACE, "res: "LPU64" updating lvb blocks from disk: "
220 LPU64" -> %lu\n", res->lr_name.name[0],
221 lvb->lvb_blocks, dentry->d_inode->i_blocks);
222 lvb->lvb_blocks = dentry->d_inode->i_blocks;
229 up(&res->lr_lvb_sem);
233 struct ldlm_valblock_ops filter_lvbo = {
234 lvbo_init: filter_lvbo_init,
235 lvbo_update: filter_lvbo_update