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  * GPL HEADER START
   5  *
   6  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   7  *
   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,
  10  * as published by the Free Software Foundation.
  11  *
  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).
  17  *
  18  * You should have received a copy of the GNU General Public License
  19  * version 2 along with this program; If not, see
  20  * http://www.sun.com/software/products/lustre/docs/GPLv2.pdf
  21  *
  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
  24  * have any questions.
  25  *
  26  * GPL HEADER END
  27  */
  28 /*
  29  * Copyright  2008 Sun Microsystems, Inc. All rights reserved
  30  * Use is subject to license terms.
  31  */
  32 /*
  33  * This file is part of Lustre, http://www.lustre.org/
  34  * Lustre is a trademark of Sun Microsystems, Inc.
  35  *
  36  * lustre/obdfilter/filter_lvb.c
  37  *
  38  * Author: Peter Braam <braam@clusterfs.com>
  39  * Author: Andreas Dilger <adilger@clusterfs.com>
  40  * Author: Phil Schwan <phil@clusterfs.com>
  41  */
  42
  43 #define DEBUG_SUBSYSTEM S_FILTER
  44
  45 #ifndef AUTOCONF_INCLUDED
  46 #include <linux/config.h>
  47 #endif
  48 #include <linux/module.h>
  49 #include <linux/version.h>
  50
  51 #include <libcfs/list.h>
  52 #include <obd_class.h>
  53 #include <lustre_dlm.h>
  54
  55 #include "filter_internal.h"
  56
  57 /* Called with res->lr_lvb_sem held */
  58 static int filter_lvbo_init(struct ldlm_resource *res)
  59 {
  60         struct ost_lvb *lvb = NULL;
  61         struct obd_device *obd;
  62         struct dentry *dentry;
  63         int rc = 0;
  64         ENTRY;
  65
  66         LASSERT(res);
  67         LASSERT_SEM_LOCKED(&res->lr_lvb_sem);
  68
  69         if (res->lr_lvb_data)
  70                 RETURN(0);
  71
  72         OBD_ALLOC(lvb, sizeof(*lvb));
  73         if (lvb == NULL)
  74                 RETURN(-ENOMEM);
  75
  76         res->lr_lvb_data = lvb;
  77         res->lr_lvb_len = sizeof(*lvb);
  78
  79         obd = res->lr_namespace->ns_lvbp;
  80         LASSERT(obd != NULL);
  81
  82         CDEBUG(D_INODE, "%s: filter_lvbo_init(o_gr="LPU64", o_id="
  83                LPU64")\n", obd->obd_name, res->lr_name.name[1],
  84                res->lr_name.name[0]);
  85
  86         dentry = filter_fid2dentry(obd, NULL, res->lr_name.name[1],
  87                                               res->lr_name.name[0]);
  88         if (IS_ERR(dentry)) {
  89                 rc = PTR_ERR(dentry);
  90                 CERROR("%s: bad object "LPU64"/"LPU64": rc %d\n", obd->obd_name,
  91                        res->lr_name.name[0], res->lr_name.name[1], rc);
  92                 RETURN(rc);
  93         }
  94
  95         if (dentry->d_inode == NULL)
  96                 /* This is always true for test_brw */
  97                 GOTO(out_dentry, rc = -ENOENT);
  98
  99         inode_init_lvb(dentry->d_inode, lvb);
 100
 101         CDEBUG(D_DLMTRACE, "res: "LPX64" initial lvb size: "LPX64", "
 102                "mtime: "LPX64", blocks: "LPX64"\n",
 103                res->lr_name.name[0], lvb->lvb_size,
 104                lvb->lvb_mtime, lvb->lvb_blocks);
 105
 106         EXIT;
 107 out_dentry:
 108         f_dput(dentry);
 109
 110         if (rc)
 111                 OST_LVB_SET_ERR(lvb->lvb_blocks, rc);
 112         /* Don't free lvb data on lookup error */
 113         return rc;
 114 }
 115
 116 /* This will be called in two ways:
 117  *
 118  *   m != NULL : called by the DLM itself after a glimpse callback
 119  *   m == NULL : called by the filter after a disk write
 120  *
 121  *   If 'increase_only' is true, don't allow values to move backwards.
 122  */
 123 static int filter_lvbo_update(struct ldlm_resource *res, struct lustre_msg *m,
 124                               int buf_idx, int increase_only)
 125 {
 126         int rc = 0;
 127         struct ost_lvb *lvb;
 128         struct obd_device *obd;
 129         struct dentry *dentry;
 130         ENTRY;
 131
 132         LASSERT(res);
 133
 134         down(&res->lr_lvb_sem);
 135         lvb = res->lr_lvb_data;
 136         if (lvb == NULL) {
 137                 CERROR("No lvb when running lvbo_update!\n");
 138                 GOTO(out, rc = 0);
 139         }
 140
 141         /* Update the LVB from the network message */
 142         if (m != NULL) {
 143                 struct ost_lvb *new;
 144
 145                 new = lustre_swab_buf(m, buf_idx, sizeof(*new),
 146                                       lustre_swab_ost_lvb);
 147                 if (new == NULL) {
 148                         CERROR("lustre_swab_buf failed\n");
 149                         goto disk_update;
 150                 }
 151                 if (new->lvb_size > lvb->lvb_size || !increase_only) {
 152                         CDEBUG(D_DLMTRACE, "res: "LPU64" updating lvb size: "
 153                                LPU64" -> "LPU64"\n", res->lr_name.name[0],
 154                                lvb->lvb_size, new->lvb_size);
 155                         lvb->lvb_size = new->lvb_size;
 156                 }
 157                 if (new->lvb_mtime > lvb->lvb_mtime || !increase_only) {
 158                         CDEBUG(D_DLMTRACE, "res: "LPU64" updating lvb mtime: "
 159                                LPU64" -> "LPU64"\n", res->lr_name.name[0],
 160                                lvb->lvb_mtime, new->lvb_mtime);
 161                         lvb->lvb_mtime = new->lvb_mtime;
 162                 }
 163                 if (new->lvb_atime > lvb->lvb_atime || !increase_only) {
 164                         CDEBUG(D_DLMTRACE, "res: "LPU64" updating lvb atime: "
 165                                LPU64" -> "LPU64"\n", res->lr_name.name[0],
 166                                lvb->lvb_atime, new->lvb_atime);
 167                         lvb->lvb_atime = new->lvb_atime;
 168                 }
 169                 if (new->lvb_ctime > lvb->lvb_ctime || !increase_only) {
 170                         CDEBUG(D_DLMTRACE, "res: "LPU64" updating lvb ctime: "
 171                                LPU64" -> "LPU64"\n", res->lr_name.name[0],
 172                                lvb->lvb_ctime, new->lvb_ctime);
 173                         lvb->lvb_ctime = new->lvb_ctime;
 174                 }
 175         }
 176
 177  disk_update:
 178         /* Update the LVB from the disk inode */
 179         obd = res->lr_namespace->ns_lvbp;
 180         LASSERT(obd);
 181
 182         dentry = filter_fid2dentry(obd, NULL, res->lr_name.name[1],
 183                                               res->lr_name.name[0]);
 184         if (IS_ERR(dentry))
 185                 GOTO(out, rc = PTR_ERR(dentry));
 186
 187         if (dentry->d_inode == NULL)
 188                 GOTO(out_dentry, rc = -ENOENT);
 189
 190         if (i_size_read(dentry->d_inode) > lvb->lvb_size || !increase_only) {
 191                 CDEBUG(D_DLMTRACE, "res: "LPU64" updating lvb size from disk: "
 192                        LPU64" -> %llu\n", res->lr_name.name[0],
 193                        lvb->lvb_size, i_size_read(dentry->d_inode));
 194                 lvb->lvb_size = i_size_read(dentry->d_inode);
 195         }
 196
 197         if (LTIME_S(dentry->d_inode->i_mtime) >lvb->lvb_mtime|| !increase_only){
 198                 CDEBUG(D_DLMTRACE, "res: "LPU64" updating lvb mtime from disk: "
 199                        LPU64" -> %lu\n", res->lr_name.name[0],
 200                        lvb->lvb_mtime, LTIME_S(dentry->d_inode->i_mtime));
 201                 lvb->lvb_mtime = LTIME_S(dentry->d_inode->i_mtime);
 202         }
 203         if (LTIME_S(dentry->d_inode->i_atime) >lvb->lvb_atime|| !increase_only){
 204                 CDEBUG(D_DLMTRACE, "res: "LPU64" updating lvb atime from disk: "
 205                        LPU64" -> %lu\n", res->lr_name.name[0],
 206                        lvb->lvb_atime, LTIME_S(dentry->d_inode->i_atime));
 207                 lvb->lvb_atime = LTIME_S(dentry->d_inode->i_atime);
 208         }
 209         if (LTIME_S(dentry->d_inode->i_ctime) >lvb->lvb_ctime|| !increase_only){
 210                 CDEBUG(D_DLMTRACE, "res: "LPU64" updating lvb ctime from disk: "
 211                        LPU64" -> %lu\n", res->lr_name.name[0],
 212                        lvb->lvb_ctime, LTIME_S(dentry->d_inode->i_ctime));
 213                 lvb->lvb_ctime = LTIME_S(dentry->d_inode->i_ctime);
 214         }
 215         if (lvb->lvb_blocks != dentry->d_inode->i_blocks) {
 216                 CDEBUG(D_DLMTRACE,"res: "LPU64" updating lvb blocks from disk: "
 217                        LPU64" -> %llu\n", res->lr_name.name[0],
 218                        lvb->lvb_blocks, (unsigned long long)dentry->d_inode->i_blocks);
 219                 lvb->lvb_blocks = dentry->d_inode->i_blocks;
 220         }
 221
 222 out_dentry:
 223         f_dput(dentry);
 224
 225 out:
 226         up(&res->lr_lvb_sem);
 227         return rc;
 228 }
 229
 230 struct ldlm_valblock_ops filter_lvbo = {
 231         lvbo_init: filter_lvbo_init,
 232         lvbo_update: filter_lvbo_update
 233 };