[XFS] factor out xfs_read_agi helper
Add a helper to read the AGI header and perform basic verification.
Based on hunks from a larger patch from Dave Chinner.
(First sent on Juli 23rd)
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Dave Chinner <david@fromorbit.com>
Signed-off-by: Niv Sardi <xaiki@sgi.com>
diff --git a/fs/xfs/xfs_log_recover.c b/fs/xfs/xfs_log_recover.c
index b411d494..b552676 100644
--- a/fs/xfs/xfs_log_recover.c
+++ b/fs/xfs/xfs_log_recover.c
@@ -3117,19 +3117,16 @@
int error;
tp = xfs_trans_alloc(mp, XFS_TRANS_CLEAR_AGI_BUCKET);
- error = xfs_trans_reserve(tp, 0, XFS_CLEAR_AGI_BUCKET_LOG_RES(mp), 0, 0, 0);
- if (!error)
- error = xfs_trans_read_buf(mp, tp, mp->m_ddev_targp,
- XFS_AG_DADDR(mp, agno, XFS_AGI_DADDR(mp)),
- XFS_FSS_TO_BB(mp, 1), 0, &agibp);
+ error = xfs_trans_reserve(tp, 0, XFS_CLEAR_AGI_BUCKET_LOG_RES(mp),
+ 0, 0, 0);
if (error)
goto out_abort;
- error = EINVAL;
- agi = XFS_BUF_TO_AGI(agibp);
- if (be32_to_cpu(agi->agi_magicnum) != XFS_AGI_MAGIC)
+ error = xfs_read_agi(mp, tp, agno, &agibp);
+ if (error)
goto out_abort;
+ agi = XFS_BUF_TO_AGI(agibp);
agi->agi_unlinked[bucket] = cpu_to_be32(NULLAGINO);
offset = offsetof(xfs_agi_t, agi_unlinked) +
(sizeof(xfs_agino_t) * bucket);
@@ -3190,16 +3187,17 @@
/*
* Find the agi for this ag.
*/
- agibp = xfs_buf_read(mp->m_ddev_targp,
- XFS_AG_DADDR(mp, agno, XFS_AGI_DADDR(mp)),
- XFS_FSS_TO_BB(mp, 1), 0);
- if (XFS_BUF_ISERROR(agibp)) {
- xfs_ioerror_alert("xlog_recover_process_iunlinks(#1)",
- log->l_mp, agibp,
- XFS_AG_DADDR(mp, agno, XFS_AGI_DADDR(mp)));
+ error = xfs_read_agi(mp, NULL, agno, &agibp);
+ if (error) {
+ /*
+ * AGI is b0rked. Don't process it.
+ *
+ * We should probably mark the filesystem as corrupt
+ * after we've recovered all the ag's we can....
+ */
+ continue;
}
agi = XFS_BUF_TO_AGI(agibp);
- ASSERT(XFS_AGI_MAGIC == be32_to_cpu(agi->agi_magicnum));
for (bucket = 0; bucket < XFS_AGI_UNLINKED_BUCKETS; bucket++) {
@@ -3278,22 +3276,12 @@
/*
* Reacquire the agibuffer and continue around
- * the loop.
+ * the loop. This should never fail as we know
+ * the buffer was good earlier on.
*/
- agibp = xfs_buf_read(mp->m_ddev_targp,
- XFS_AG_DADDR(mp, agno,
- XFS_AGI_DADDR(mp)),
- XFS_FSS_TO_BB(mp, 1), 0);
- if (XFS_BUF_ISERROR(agibp)) {
- xfs_ioerror_alert(
- "xlog_recover_process_iunlinks(#2)",
- log->l_mp, agibp,
- XFS_AG_DADDR(mp, agno,
- XFS_AGI_DADDR(mp)));
- }
+ error = xfs_read_agi(mp, NULL, agno, &agibp);
+ ASSERT(error == 0);
agi = XFS_BUF_TO_AGI(agibp);
- ASSERT(XFS_AGI_MAGIC == be32_to_cpu(
- agi->agi_magicnum));
}
}
@@ -3980,11 +3968,9 @@
{
xfs_mount_t *mp;
xfs_agf_t *agfp;
- xfs_agi_t *agip;
xfs_buf_t *agfbp;
xfs_buf_t *agibp;
xfs_daddr_t agfdaddr;
- xfs_daddr_t agidaddr;
xfs_buf_t *sbbp;
#ifdef XFS_LOUD_RECOVERY
xfs_sb_t *sbp;
@@ -3993,6 +3979,7 @@
__uint64_t freeblks;
__uint64_t itotal;
__uint64_t ifree;
+ int error;
mp = log->l_mp;
@@ -4016,21 +4003,14 @@
be32_to_cpu(agfp->agf_flcount);
xfs_buf_relse(agfbp);
- agidaddr = XFS_AG_DADDR(mp, agno, XFS_AGI_DADDR(mp));
- agibp = xfs_buf_read(mp->m_ddev_targp, agidaddr,
- XFS_FSS_TO_BB(mp, 1), 0);
- if (XFS_BUF_ISERROR(agibp)) {
- xfs_ioerror_alert("xlog_recover_check_summary(agi)",
- mp, agibp, agidaddr);
- }
- agip = XFS_BUF_TO_AGI(agibp);
- ASSERT(XFS_AGI_MAGIC == be32_to_cpu(agip->agi_magicnum));
- ASSERT(XFS_AGI_GOOD_VERSION(be32_to_cpu(agip->agi_versionnum)));
- ASSERT(be32_to_cpu(agip->agi_seqno) == agno);
+ error = xfs_read_agi(mp, NULL, agno, &agibp);
+ if (!error) {
+ struct xfs_agi *agi = XFS_BUF_TO_AGI(agibp);
- itotal += be32_to_cpu(agip->agi_count);
- ifree += be32_to_cpu(agip->agi_freecount);
- xfs_buf_relse(agibp);
+ itotal += be32_to_cpu(agi->agi_count);
+ ifree += be32_to_cpu(agi->agi_freecount);
+ xfs_buf_relse(agibp);
+ }
}
sbbp = xfs_getsb(mp, 0);
