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 <portals/list.h>
34 #include <linux/obd_class.h>
35 #include <linux/lustre_dlm.h>
37 #include "filter_internal.h"
39 static int filter_lvbo_init(struct ldlm_resource *res)
42 struct ost_lvb *lvb = NULL;
43 struct obd_device *obd;
44 struct obdo *oa = NULL;
45 struct dentry *dentry;
50 /* we only want lvb's for object resources */
51 /* check for internal locks: these have name[1] != 0 */
52 if (res->lr_name.name[1])
55 down(&res->lr_lvb_sem);
59 OBD_ALLOC(lvb, sizeof(*lvb));
61 GOTO(out, rc = -ENOMEM);
63 res->lr_lvb_data = lvb;
64 res->lr_lvb_len = sizeof(*lvb);
66 obd = res->lr_namespace->ns_lvbp;
71 GOTO(out, rc = -ENOMEM);
73 oa->o_id = res->lr_name.name[0];
75 dentry = filter_oa2dentry(obd, oa);
77 GOTO(out, rc = PTR_ERR(dentry));
79 /* Limit the valid bits in the return data to what we actually use */
80 oa->o_valid = OBD_MD_FLID;
81 obdo_from_inode(oa, dentry->d_inode, FILTER_VALID_FLAGS);
84 lvb->lvb_size = dentry->d_inode->i_size;
85 lvb->lvb_mtime = LTIME_S(dentry->d_inode->i_mtime);
86 CDEBUG(D_DLMTRACE, "res: "LPU64" initial lvb size: "LPU64", mtime: "
87 LPU64"\n", res->lr_name.name[0], lvb->lvb_size, lvb->lvb_mtime);
92 if (rc && lvb != NULL) {
93 OBD_FREE(lvb, sizeof(*lvb));
94 res->lr_lvb_data = NULL;
101 /* This will be called in two ways:
103 * m != NULL : called by the DLM itself after a glimpse callback
104 * m == NULL : called by the filter after a disk write
106 * If 'increase' is true, don't allow values to move backwards.
108 static int filter_lvbo_update(struct ldlm_resource *res, struct lustre_msg *m,
109 int buf_idx, int increase)
112 struct ost_lvb *lvb = res->lr_lvb_data;
113 struct obd_device *obd;
114 struct obdo *oa = NULL;
115 struct dentry *dentry;
120 /* we only want lvb's for object resources */
121 /* check for internal locks: these have name[1] != 0 */
122 if (res->lr_name.name[1])
125 down(&res->lr_lvb_sem);
126 if (!res->lr_lvb_data) {
127 CERROR("No lvb when running lvbo_update!\n");
131 /* Update the LVB from the network message */
135 new = lustre_swab_buf(m, buf_idx, sizeof(*new),
136 lustre_swab_ost_lvb);
138 CERROR("lustre_swab_buf failed\n");
139 //GOTO(out, rc = -EPROTO);
142 if (new->lvb_size > lvb->lvb_size || !increase) {
143 CDEBUG(D_DLMTRACE, "res: "LPU64" updating lvb size: "
144 LPU64" -> "LPU64"\n", res->lr_name.name[0],
145 lvb->lvb_size, new->lvb_size);
146 lvb->lvb_size = new->lvb_size;
148 if (new->lvb_mtime > lvb->lvb_mtime || !increase) {
149 CDEBUG(D_DLMTRACE, "res: "LPU64" updating lvb mtime: "
150 LPU64" -> "LPU64"\n", res->lr_name.name[0],
151 lvb->lvb_mtime, new->lvb_mtime);
152 lvb->lvb_mtime = new->lvb_mtime;
157 /* Update the LVB from the disk inode */
158 obd = res->lr_namespace->ns_lvbp;
163 GOTO(out, rc = -ENOMEM);
165 oa->o_id = res->lr_name.name[0];
167 dentry = filter_oa2dentry(obd, oa);
169 GOTO(out, rc = PTR_ERR(dentry));
171 /* Limit the valid bits in the return data to what we actually use */
172 oa->o_valid = OBD_MD_FLID;
173 obdo_from_inode(oa, dentry->d_inode, FILTER_VALID_FLAGS);
175 if (dentry->d_inode->i_size > lvb->lvb_size || !increase) {
176 CDEBUG(D_DLMTRACE, "res: "LPU64" updating lvb size from disk: "
177 LPU64" -> %llu\n", res->lr_name.name[0],
178 lvb->lvb_size, dentry->d_inode->i_size);
179 lvb->lvb_size = dentry->d_inode->i_size;
181 if (LTIME_S(dentry->d_inode->i_mtime) > lvb->lvb_mtime || !increase) {
182 CDEBUG(D_DLMTRACE, "res: "LPU64" updating lvb mtime from disk: "
183 LPU64" -> %lu\n", res->lr_name.name[0],
184 lvb->lvb_mtime, LTIME_S(dentry->d_inode->i_mtime));
185 lvb->lvb_mtime = LTIME_S(dentry->d_inode->i_mtime);
192 up(&res->lr_lvb_sem);
198 struct ldlm_valblock_ops filter_lvbo = {
199 lvbo_init: filter_lvbo_init,
200 lvbo_update: filter_lvbo_update