fs/xfs/xfs_dquot_item_recover.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * Copyright (c) 2000-2006 Silicon Graphics, Inc.
   4  * All Rights Reserved.
   5  */
   6 #include "xfs.h"
   7 #include "xfs_fs.h"
   8 #include "xfs_shared.h"
   9 #include "xfs_format.h"
  10 #include "xfs_log_format.h"
  11 #include "xfs_trans_resv.h"
  12 #include "xfs_mount.h"
  13 #include "xfs_inode.h"
  14 #include "xfs_quota.h"
  15 #include "xfs_trans.h"
  16 #include "xfs_buf_item.h"
  17 #include "xfs_trans_priv.h"
  18 #include "xfs_qm.h"
  19 #include "xfs_log.h"
  20 #include "xfs_log_priv.h"
  21 #include "xfs_log_recover.h"
  22
  23 STATIC void
  24 xlog_recover_dquot_ra_pass2(
  25         struct xlog                     *log,
  26         struct xlog_recover_item        *item)
  27 {
  28         struct xfs_mount        *mp = log->l_mp;
  29         struct xfs_disk_dquot   *recddq;
  30         struct xfs_dq_logformat *dq_f;
  31         uint                    type;
  32
  33         if (mp->m_qflags == 0)
  34                 return;
  35
  36         recddq = item->ri_buf[1].i_addr;
  37         if (recddq == NULL)
  38                 return;
  39         if (item->ri_buf[1].i_len < sizeof(struct xfs_disk_dquot))
  40                 return;
  41
  42         type = recddq->d_type & XFS_DQTYPE_REC_MASK;
  43         ASSERT(type);
  44         if (log->l_quotaoffs_flag & type)
  45                 return;
  46
  47         dq_f = item->ri_buf[0].i_addr;
  48         ASSERT(dq_f);
  49         ASSERT(dq_f->qlf_len == 1);
  50
  51         xlog_buf_readahead(log, dq_f->qlf_blkno,
  52                         XFS_FSB_TO_BB(mp, dq_f->qlf_len),
  53                         &xfs_dquot_buf_ra_ops);
  54 }
  55
  56 /*
  57  * Recover a dquot record
  58  */
  59 STATIC int
  60 xlog_recover_dquot_commit_pass2(
  61         struct xlog                     *log,
  62         struct list_head                *buffer_list,
  63         struct xlog_recover_item        *item,
  64         xfs_lsn_t                       current_lsn)
  65 {
  66         struct xfs_mount                *mp = log->l_mp;
  67         struct xfs_buf                  *bp;
  68         struct xfs_disk_dquot           *ddq, *recddq;
  69         struct xfs_dq_logformat         *dq_f;
  70         xfs_failaddr_t                  fa;
  71         int                             error;
  72         uint                            type;
  73
  74         /*
  75          * Filesystems are required to send in quota flags at mount time.
  76          */
  77         if (mp->m_qflags == 0)
  78                 return 0;
  79
  80         recddq = item->ri_buf[1].i_addr;
  81         if (recddq == NULL) {
  82                 xfs_alert(log->l_mp, "NULL dquot in %s.", __func__);
  83                 return -EFSCORRUPTED;
  84         }
  85         if (item->ri_buf[1].i_len < sizeof(struct xfs_disk_dquot)) {
  86                 xfs_alert(log->l_mp, "dquot too small (%d) in %s.",
  87                         item->ri_buf[1].i_len, __func__);
  88                 return -EFSCORRUPTED;
  89         }
  90
  91         /*
  92          * This type of quotas was turned off, so ignore this record.
  93          */
  94         type = recddq->d_type & XFS_DQTYPE_REC_MASK;
  95         ASSERT(type);
  96         if (log->l_quotaoffs_flag & type)
  97                 return 0;
  98
  99         /*
 100          * At this point we know that quota was _not_ turned off.
 101          * Since the mount flags are not indicating to us otherwise, this
 102          * must mean that quota is on, and the dquot needs to be replayed.
 103          * Remember that we may not have fully recovered the superblock yet,
 104          * so we can't do the usual trick of looking at the SB quota bits.
 105          *
 106          * The other possibility, of course, is that the quota subsystem was
 107          * removed since the last mount - ENOSYS.
 108          */
 109         dq_f = item->ri_buf[0].i_addr;
 110         ASSERT(dq_f);
 111         fa = xfs_dquot_verify(mp, recddq, dq_f->qlf_id);
 112         if (fa) {
 113                 xfs_alert(mp, "corrupt dquot ID 0x%x in log at %pS",
 114                                 dq_f->qlf_id, fa);
 115                 return -EFSCORRUPTED;
 116         }
 117         ASSERT(dq_f->qlf_len == 1);
 118
 119         /*
 120          * At this point we are assuming that the dquots have been allocated
 121          * and hence the buffer has valid dquots stamped in it. It should,
 122          * therefore, pass verifier validation. If the dquot is bad, then the
 123          * we'll return an error here, so we don't need to specifically check
 124          * the dquot in the buffer after the verifier has run.
 125          */
 126         error = xfs_trans_read_buf(mp, NULL, mp->m_ddev_targp, dq_f->qlf_blkno,
 127                                    XFS_FSB_TO_BB(mp, dq_f->qlf_len), 0, &bp,
 128                                    &xfs_dquot_buf_ops);
 129         if (error)
 130                 return error;
 131
 132         ASSERT(bp);
 133         ddq = xfs_buf_offset(bp, dq_f->qlf_boffset);
 134
 135         /*
 136          * If the dquot has an LSN in it, recover the dquot only if it's less
 137          * than the lsn of the transaction we are replaying.
 138          */
 139         if (xfs_has_crc(mp)) {
 140                 struct xfs_dqblk *dqb = (struct xfs_dqblk *)ddq;
 141                 xfs_lsn_t       lsn = be64_to_cpu(dqb->dd_lsn);
 142
 143                 if (lsn && lsn != -1 && XFS_LSN_CMP(lsn, current_lsn) >= 0) {
 144                         goto out_release;
 145                 }
 146         }
 147
 148         memcpy(ddq, recddq, item->ri_buf[1].i_len);
 149         if (xfs_has_crc(mp)) {
 150                 xfs_update_cksum((char *)ddq, sizeof(struct xfs_dqblk),
 151                                  XFS_DQUOT_CRC_OFF);
 152         }
 153
 154         ASSERT(dq_f->qlf_size == 2);
 155         ASSERT(bp->b_mount == mp);
 156         bp->b_flags |= _XBF_LOGRECOVERY;
 157         xfs_buf_delwri_queue(bp, buffer_list);
 158
 159 out_release:
 160         xfs_buf_relse(bp);
 161         return 0;
 162 }
 163
 164 const struct xlog_recover_item_ops xlog_dquot_item_ops = {
 165         .item_type              = XFS_LI_DQUOT,
 166         .ra_pass2               = xlog_recover_dquot_ra_pass2,
 167         .commit_pass2           = xlog_recover_dquot_commit_pass2,
 168 };
 169
 170 /*
 171  * Recover QUOTAOFF records. We simply make a note of it in the xlog
 172  * structure, so that we know not to do any dquot item or dquot buffer recovery,
 173  * of that type.
 174  */
 175 STATIC int
 176 xlog_recover_quotaoff_commit_pass1(
 177         struct xlog                     *log,
 178         struct xlog_recover_item        *item)
 179 {
 180         struct xfs_qoff_logformat       *qoff_f = item->ri_buf[0].i_addr;
 181         ASSERT(qoff_f);
 182
 183         /*
 184          * The logitem format's flag tells us if this was user quotaoff,
 185          * group/project quotaoff or both.
 186          */
 187         if (qoff_f->qf_flags & XFS_UQUOTA_ACCT)
 188                 log->l_quotaoffs_flag |= XFS_DQTYPE_USER;
 189         if (qoff_f->qf_flags & XFS_PQUOTA_ACCT)
 190                 log->l_quotaoffs_flag |= XFS_DQTYPE_PROJ;
 191         if (qoff_f->qf_flags & XFS_GQUOTA_ACCT)
 192                 log->l_quotaoffs_flag |= XFS_DQTYPE_GROUP;
 193
 194         return 0;
 195 }
 196
 197 const struct xlog_recover_item_ops xlog_quotaoff_item_ops = {
 198         .item_type              = XFS_LI_QUOTAOFF,
 199         .commit_pass1           = xlog_recover_quotaoff_commit_pass1,
 200         /* nothing to commit in pass2 */
 201 };