fs/xfs/xfs_dquot_buf.c

   1 /*
   2  * Copyright (c) 2000-2006 Silicon Graphics, Inc.
   3  * Copyright (c) 2013 Red Hat, Inc.
   4  * All Rights Reserved.
   5  *
   6  * This program is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU General Public License as
   8  * published by the Free Software Foundation.
   9  *
  10  * This program is distributed in the hope that it would be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  * GNU General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License
  16  * along with this program; if not, write the Free Software Foundation,
  17  * Inc.,  51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
  18  */
  19 #include "xfs.h"
  20 #include "xfs_fs.h"
  21 #include "xfs_format.h"
  22 #include "xfs_log_format.h"
  23 #include "xfs_trans_resv.h"
  24 #include "xfs_bit.h"
  25 #include "xfs_sb.h"
  26 #include "xfs_ag.h"
  27 #include "xfs_mount.h"
  28 #include "xfs_bmap_btree.h"
  29 #include "xfs_inode.h"
  30 #include "xfs_quota.h"
  31 #include "xfs_trans.h"
  32 #include "xfs_qm.h"
  33 #include "xfs_error.h"
  34 #include "xfs_cksum.h"
  35 #include "xfs_trace.h"
  36
  37 int
  38 xfs_calc_dquots_per_chunk(
  39         struct xfs_mount        *mp,
  40         unsigned int            nbblks) /* basic block units */
  41 {
  42         unsigned int    ndquots;
  43
  44         ASSERT(nbblks > 0);
  45         ndquots = BBTOB(nbblks);
  46         do_div(ndquots, sizeof(xfs_dqblk_t));
  47
  48         return ndquots;
  49 }
  50
  51 /*
  52  * Do some primitive error checking on ondisk dquot data structures.
  53  */
  54 int
  55 xfs_dqcheck(
  56         struct xfs_mount *mp,
  57         xfs_disk_dquot_t *ddq,
  58         xfs_dqid_t       id,
  59         uint             type,    /* used only when IO_dorepair is true */
  60         uint             flags,
  61         char             *str)
  62 {
  63         xfs_dqblk_t      *d = (xfs_dqblk_t *)ddq;
  64         int             errs = 0;
  65
  66         /*
  67          * We can encounter an uninitialized dquot buffer for 2 reasons:
  68          * 1. If we crash while deleting the quotainode(s), and those blks got
  69          *    used for user data. This is because we take the path of regular
  70          *    file deletion; however, the size field of quotainodes is never
  71          *    updated, so all the tricks that we play in itruncate_finish
  72          *    don't quite matter.
  73          *
  74          * 2. We don't play the quota buffers when there's a quotaoff logitem.
  75          *    But the allocation will be replayed so we'll end up with an
  76          *    uninitialized quota block.
  77          *
  78          * This is all fine; things are still consistent, and we haven't lost
  79          * any quota information. Just don't complain about bad dquot blks.
  80          */
  81         if (ddq->d_magic != cpu_to_be16(XFS_DQUOT_MAGIC)) {
  82                 if (flags & XFS_QMOPT_DOWARN)
  83                         xfs_alert(mp,
  84                         "%s : XFS dquot ID 0x%x, magic 0x%x != 0x%x",
  85                         str, id, be16_to_cpu(ddq->d_magic), XFS_DQUOT_MAGIC);
  86                 errs++;
  87         }
  88         if (ddq->d_version != XFS_DQUOT_VERSION) {
  89                 if (flags & XFS_QMOPT_DOWARN)
  90                         xfs_alert(mp,
  91                         "%s : XFS dquot ID 0x%x, version 0x%x != 0x%x",
  92                         str, id, ddq->d_version, XFS_DQUOT_VERSION);
  93                 errs++;
  94         }
  95
  96         if (ddq->d_flags != XFS_DQ_USER &&
  97             ddq->d_flags != XFS_DQ_PROJ &&
  98             ddq->d_flags != XFS_DQ_GROUP) {
  99                 if (flags & XFS_QMOPT_DOWARN)
 100                         xfs_alert(mp,
 101                         "%s : XFS dquot ID 0x%x, unknown flags 0x%x",
 102                         str, id, ddq->d_flags);
 103                 errs++;
 104         }
 105
 106         if (id != -1 && id != be32_to_cpu(ddq->d_id)) {
 107                 if (flags & XFS_QMOPT_DOWARN)
 108                         xfs_alert(mp,
 109                         "%s : ondisk-dquot 0x%p, ID mismatch: "
 110                         "0x%x expected, found id 0x%x",
 111                         str, ddq, id, be32_to_cpu(ddq->d_id));
 112                 errs++;
 113         }
 114
 115         if (!errs && ddq->d_id) {
 116                 if (ddq->d_blk_softlimit &&
 117                     be64_to_cpu(ddq->d_bcount) >
 118                                 be64_to_cpu(ddq->d_blk_softlimit)) {
 119                         if (!ddq->d_btimer) {
 120                                 if (flags & XFS_QMOPT_DOWARN)
 121                                         xfs_alert(mp,
 122                         "%s : Dquot ID 0x%x (0x%p) BLK TIMER NOT STARTED",
 123                                         str, (int)be32_to_cpu(ddq->d_id), ddq);
 124                                 errs++;
 125                         }
 126                 }
 127                 if (ddq->d_ino_softlimit &&
 128                     be64_to_cpu(ddq->d_icount) >
 129                                 be64_to_cpu(ddq->d_ino_softlimit)) {
 130                         if (!ddq->d_itimer) {
 131                                 if (flags & XFS_QMOPT_DOWARN)
 132                                         xfs_alert(mp,
 133                         "%s : Dquot ID 0x%x (0x%p) INODE TIMER NOT STARTED",
 134                                         str, (int)be32_to_cpu(ddq->d_id), ddq);
 135                                 errs++;
 136                         }
 137                 }
 138                 if (ddq->d_rtb_softlimit &&
 139                     be64_to_cpu(ddq->d_rtbcount) >
 140                                 be64_to_cpu(ddq->d_rtb_softlimit)) {
 141                         if (!ddq->d_rtbtimer) {
 142                                 if (flags & XFS_QMOPT_DOWARN)
 143                                         xfs_alert(mp,
 144                         "%s : Dquot ID 0x%x (0x%p) RTBLK TIMER NOT STARTED",
 145                                         str, (int)be32_to_cpu(ddq->d_id), ddq);
 146                                 errs++;
 147                         }
 148                 }
 149         }
 150
 151         if (!errs || !(flags & XFS_QMOPT_DQREPAIR))
 152                 return errs;
 153
 154         if (flags & XFS_QMOPT_DOWARN)
 155                 xfs_notice(mp, "Re-initializing dquot ID 0x%x", id);
 156
 157         /*
 158          * Typically, a repair is only requested by quotacheck.
 159          */
 160         ASSERT(id != -1);
 161         ASSERT(flags & XFS_QMOPT_DQREPAIR);
 162         memset(d, 0, sizeof(xfs_dqblk_t));
 163
 164         d->dd_diskdq.d_magic = cpu_to_be16(XFS_DQUOT_MAGIC);
 165         d->dd_diskdq.d_version = XFS_DQUOT_VERSION;
 166         d->dd_diskdq.d_flags = type;
 167         d->dd_diskdq.d_id = cpu_to_be32(id);
 168
 169         if (xfs_sb_version_hascrc(&mp->m_sb)) {
 170                 uuid_copy(&d->dd_uuid, &mp->m_sb.sb_uuid);
 171                 xfs_update_cksum((char *)d, sizeof(struct xfs_dqblk),
 172                                  XFS_DQUOT_CRC_OFF);
 173         }
 174
 175         return errs;
 176 }
 177
 178 STATIC bool
 179 xfs_dquot_buf_verify_crc(
 180         struct xfs_mount        *mp,
 181         struct xfs_buf          *bp)
 182 {
 183         struct xfs_dqblk        *d = (struct xfs_dqblk *)bp->b_addr;
 184         int                     ndquots;
 185         int                     i;
 186
 187         if (!xfs_sb_version_hascrc(&mp->m_sb))
 188                 return true;
 189
 190         /*
 191          * if we are in log recovery, the quota subsystem has not been
 192          * initialised so we have no quotainfo structure. In that case, we need
 193          * to manually calculate the number of dquots in the buffer.
 194          */
 195         if (mp->m_quotainfo)
 196                 ndquots = mp->m_quotainfo->qi_dqperchunk;
 197         else
 198                 ndquots = xfs_calc_dquots_per_chunk(mp,
 199                                         XFS_BB_TO_FSB(mp, bp->b_length));
 200
 201         for (i = 0; i < ndquots; i++, d++) {
 202                 if (!xfs_verify_cksum((char *)d, sizeof(struct xfs_dqblk),
 203                                  XFS_DQUOT_CRC_OFF))
 204                         return false;
 205                 if (!uuid_equal(&d->dd_uuid, &mp->m_sb.sb_uuid))
 206                         return false;
 207         }
 208         return true;
 209 }
 210
 211 STATIC bool
 212 xfs_dquot_buf_verify(
 213         struct xfs_mount        *mp,
 214         struct xfs_buf          *bp)
 215 {
 216         struct xfs_dqblk        *d = (struct xfs_dqblk *)bp->b_addr;
 217         xfs_dqid_t              id = 0;
 218         int                     ndquots;
 219         int                     i;
 220
 221         /*
 222          * if we are in log recovery, the quota subsystem has not been
 223          * initialised so we have no quotainfo structure. In that case, we need
 224          * to manually calculate the number of dquots in the buffer.
 225          */
 226         if (mp->m_quotainfo)
 227                 ndquots = mp->m_quotainfo->qi_dqperchunk;
 228         else
 229                 ndquots = xfs_calc_dquots_per_chunk(mp, bp->b_length);
 230
 231         /*
 232          * On the first read of the buffer, verify that each dquot is valid.
 233          * We don't know what the id of the dquot is supposed to be, just that
 234          * they should be increasing monotonically within the buffer. If the
 235          * first id is corrupt, then it will fail on the second dquot in the
 236          * buffer so corruptions could point to the wrong dquot in this case.
 237          */
 238         for (i = 0; i < ndquots; i++) {
 239                 struct xfs_disk_dquot   *ddq;
 240                 int                     error;
 241
 242                 ddq = &d[i].dd_diskdq;
 243
 244                 if (i == 0)
 245                         id = be32_to_cpu(ddq->d_id);
 246
 247                 error = xfs_dqcheck(mp, ddq, id + i, 0, XFS_QMOPT_DOWARN,
 248                                        "xfs_dquot_buf_verify");
 249                 if (error)
 250                         return false;
 251         }
 252         return true;
 253 }
 254
 255 static void
 256 xfs_dquot_buf_read_verify(
 257         struct xfs_buf  *bp)
 258 {
 259         struct xfs_mount        *mp = bp->b_target->bt_mount;
 260
 261         if (!xfs_dquot_buf_verify_crc(mp, bp) || !xfs_dquot_buf_verify(mp, bp)) {
 262                 XFS_CORRUPTION_ERROR(__func__, XFS_ERRLEVEL_LOW, mp, bp->b_addr);
 263                 xfs_buf_ioerror(bp, EFSCORRUPTED);
 264         }
 265 }
 266
 267 /*
 268  * we don't calculate the CRC here as that is done when the dquot is flushed to
 269  * the buffer after the update is done. This ensures that the dquot in the
 270  * buffer always has an up-to-date CRC value.
 271  */
 272 void
 273 xfs_dquot_buf_write_verify(
 274         struct xfs_buf  *bp)
 275 {
 276         struct xfs_mount        *mp = bp->b_target->bt_mount;
 277
 278         if (!xfs_dquot_buf_verify(mp, bp)) {
 279                 XFS_CORRUPTION_ERROR(__func__, XFS_ERRLEVEL_LOW, mp, bp->b_addr);
 280                 xfs_buf_ioerror(bp, EFSCORRUPTED);
 281                 return;
 282         }
 283 }
 284
 285 const struct xfs_buf_ops xfs_dquot_buf_ops = {
 286         .verify_read = xfs_dquot_buf_read_verify,
 287         .verify_write = xfs_dquot_buf_write_verify,
 288 };
 289