lustre/obdfilter/filter_lvb.c

   1 /* -*- mode: c; c-basic-offset: 8; indent-tabs-mode: nil; -*-
   2  * vim:expandtab:shiftwidth=8:tabstop=8:
   3  *
   4  *  linux/fs/obdfilter/filter_log.c
   5  *
   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>
  10  *
  11  *   This file is part of the Lustre file system, http://www.lustre.org
  12  *   Lustre is a trademark of Cluster File Systems, Inc.
  13  *
  14  *   You may have signed or agreed to another license before downloading
  15  *   this software.  If so, you are bound by the terms and conditions
  16  *   of that agreement, and the following does not apply to you.  See the
  17  *   LICENSE file included with this distribution for more information.
  18  *
  19  *   If you did not agree to a different license, then this copy of Lustre
  20  *   is open source software; you can redistribute it and/or modify it
  21  *   under the terms of version 2 of the GNU General Public License as
  22  *   published by the Free Software Foundation.
  23  *
  24  *   In either case, Lustre is distributed in the hope that it will be
  25  *   useful, but WITHOUT ANY WARRANTY; without even the implied warranty
  26  *   of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  27  *   license text for more details.
  28  */
  29
  30 #define DEBUG_SUBSYSTEM S_FILTER
  31
  32 #ifndef AUTOCONF_INCLUDED
  33 #include <linux/config.h>
  34 #endif
  35 #include <linux/module.h>
  36 #include <linux/version.h>
  37
  38 #include <libcfs/list.h>
  39 #include <obd_class.h>
  40 #include <lustre_dlm.h>
  41
  42 #include "filter_internal.h"
  43
  44 /* Called with res->lr_lvb_sem held */
  45 static int filter_lvbo_init(struct ldlm_resource *res)
  46 {
  47         struct ost_lvb *lvb = NULL;
  48         struct obd_device *obd;
  49         struct dentry *dentry;
  50         int rc = 0;
  51         ENTRY;
  52
  53         LASSERT(res);
  54         LASSERT_SEM_LOCKED(&res->lr_lvb_sem);
  55
  56         if (res->lr_lvb_data)
  57                 RETURN(0);
  58
  59         OBD_ALLOC(lvb, sizeof(*lvb));
  60         if (lvb == NULL)
  61                 RETURN(-ENOMEM);
  62
  63         res->lr_lvb_data = lvb;
  64         res->lr_lvb_len = sizeof(*lvb);
  65
  66         obd = res->lr_namespace->ns_lvbp;
  67         LASSERT(obd != NULL);
  68
  69         dentry = filter_fid2dentry(obd, NULL, res->lr_name.name[1],
  70                                               res->lr_name.name[0]);
  71         if (IS_ERR(dentry)) {
  72                 rc = PTR_ERR(dentry);
  73                 CERROR("%s: bad object "LPU64"/"LPU64": rc %d\n", obd->obd_name,
  74                        res->lr_name.name[0], res->lr_name.name[1], rc);
  75                 RETURN(rc);
  76         }
  77
  78         if (dentry->d_inode == NULL)
  79                 /* This is always true for test_brw */
  80                 GOTO(out_dentry, rc = -ENOENT);
  81
  82         inode_init_lvb(dentry->d_inode, lvb);
  83
  84         CDEBUG(D_DLMTRACE, "res: "LPX64" initial lvb size: "LPX64", "
  85                "mtime: "LPX64", blocks: "LPX64"\n",
  86                res->lr_name.name[0], lvb->lvb_size,
  87                lvb->lvb_mtime, lvb->lvb_blocks);
  88
  89         EXIT;
  90 out_dentry:
  91         f_dput(dentry);
  92
  93         if (rc)
  94                 OST_LVB_SET_ERR(lvb->lvb_blocks, rc);
  95         /* Don't free lvb data on lookup error */
  96         return rc;
  97 }
  98
  99 /* This will be called in two ways:
 100  *
 101  *   m != NULL : called by the DLM itself after a glimpse callback
 102  *   m == NULL : called by the filter after a disk write
 103  *
 104  *   If 'increase_only' is true, don't allow values to move backwards.
 105  */
 106 static int filter_lvbo_update(struct ldlm_resource *res, struct lustre_msg *m,
 107                               int buf_idx, int increase_only)
 108 {
 109         int rc = 0;
 110         struct ost_lvb *lvb;
 111         struct obd_device *obd;
 112         struct dentry *dentry;
 113         ENTRY;
 114
 115         LASSERT(res);
 116
 117         down(&res->lr_lvb_sem);
 118         lvb = res->lr_lvb_data;
 119         if (lvb == NULL) {
 120                 CERROR("No lvb when running lvbo_update!\n");
 121                 GOTO(out, rc = 0);
 122         }
 123
 124         /* Update the LVB from the network message */
 125         if (m != NULL) {
 126                 struct ost_lvb *new;
 127
 128                 new = lustre_swab_buf(m, buf_idx, sizeof(*new),
 129                                       lustre_swab_ost_lvb);
 130                 if (new == NULL) {
 131                         CERROR("lustre_swab_buf failed\n");
 132                         goto disk_update;
 133                 }
 134                 if (new->lvb_size > lvb->lvb_size || !increase_only) {
 135                         CDEBUG(D_DLMTRACE, "res: "LPU64" updating lvb size: "
 136                                LPU64" -> "LPU64"\n", res->lr_name.name[0],
 137                                lvb->lvb_size, new->lvb_size);
 138                         lvb->lvb_size = new->lvb_size;
 139                 }
 140                 if (new->lvb_mtime > lvb->lvb_mtime || !increase_only) {
 141                         CDEBUG(D_DLMTRACE, "res: "LPU64" updating lvb mtime: "
 142                                LPU64" -> "LPU64"\n", res->lr_name.name[0],
 143                                lvb->lvb_mtime, new->lvb_mtime);
 144                         lvb->lvb_mtime = new->lvb_mtime;
 145                 }
 146                 if (new->lvb_atime > lvb->lvb_atime || !increase_only) {
 147                         CDEBUG(D_DLMTRACE, "res: "LPU64" updating lvb atime: "
 148                                LPU64" -> "LPU64"\n", res->lr_name.name[0],
 149                                lvb->lvb_atime, new->lvb_atime);
 150                         lvb->lvb_atime = new->lvb_atime;
 151                 }
 152                 if (new->lvb_ctime > lvb->lvb_ctime || !increase_only) {
 153                         CDEBUG(D_DLMTRACE, "res: "LPU64" updating lvb ctime: "
 154                                LPU64" -> "LPU64"\n", res->lr_name.name[0],
 155                                lvb->lvb_ctime, new->lvb_ctime);
 156                         lvb->lvb_ctime = new->lvb_ctime;
 157                 }
 158         }
 159
 160  disk_update:
 161         /* Update the LVB from the disk inode */
 162         obd = res->lr_namespace->ns_lvbp;
 163         LASSERT(obd);
 164
 165         dentry = filter_fid2dentry(obd, NULL, res->lr_name.name[1],
 166                                               res->lr_name.name[0]);
 167         if (IS_ERR(dentry))
 168                 GOTO(out, rc = PTR_ERR(dentry));
 169
 170         if (dentry->d_inode == NULL)
 171                 GOTO(out_dentry, rc = -ENOENT);
 172
 173         if (i_size_read(dentry->d_inode) > lvb->lvb_size || !increase_only) {
 174                 CDEBUG(D_DLMTRACE, "res: "LPU64" updating lvb size from disk: "
 175                        LPU64" -> %llu\n", res->lr_name.name[0],
 176                        lvb->lvb_size, i_size_read(dentry->d_inode));
 177                 lvb->lvb_size = i_size_read(dentry->d_inode);
 178         }
 179
 180         if (LTIME_S(dentry->d_inode->i_mtime) >lvb->lvb_mtime|| !increase_only){
 181                 CDEBUG(D_DLMTRACE, "res: "LPU64" updating lvb mtime from disk: "
 182                        LPU64" -> %lu\n", res->lr_name.name[0],
 183                        lvb->lvb_mtime, LTIME_S(dentry->d_inode->i_mtime));
 184                 lvb->lvb_mtime = LTIME_S(dentry->d_inode->i_mtime);
 185         }
 186         if (LTIME_S(dentry->d_inode->i_atime) >lvb->lvb_atime|| !increase_only){
 187                 CDEBUG(D_DLMTRACE, "res: "LPU64" updating lvb atime from disk: "
 188                        LPU64" -> %lu\n", res->lr_name.name[0],
 189                        lvb->lvb_atime, LTIME_S(dentry->d_inode->i_atime));
 190                 lvb->lvb_atime = LTIME_S(dentry->d_inode->i_atime);
 191         }
 192         if (LTIME_S(dentry->d_inode->i_ctime) >lvb->lvb_ctime|| !increase_only){
 193                 CDEBUG(D_DLMTRACE, "res: "LPU64" updating lvb ctime from disk: "
 194                        LPU64" -> %lu\n", res->lr_name.name[0],
 195                        lvb->lvb_ctime, LTIME_S(dentry->d_inode->i_ctime));
 196                 lvb->lvb_ctime = LTIME_S(dentry->d_inode->i_ctime);
 197         }
 198         if (lvb->lvb_blocks != dentry->d_inode->i_blocks) {
 199                 CDEBUG(D_DLMTRACE,"res: "LPU64" updating lvb blocks from disk: "
 200                        LPU64" -> %llu\n", res->lr_name.name[0],
 201                        lvb->lvb_blocks, (unsigned long long)dentry->d_inode->i_blocks);
 202                 lvb->lvb_blocks = dentry->d_inode->i_blocks;
 203         }
 204
 205 out_dentry:
 206         f_dput(dentry);
 207
 208 out:
 209         up(&res->lr_lvb_sem);
 210         return rc;
 211 }
 212
 213 struct ldlm_valblock_ops filter_lvbo = {
 214         lvbo_init: filter_lvbo_init,
 215         lvbo_update: filter_lvbo_update
 216 };