From: Darrick J. Wong <darrick.wong@xxxxxxxxxx>
If one of the backup superblocks is found to differ seriously from
superblock 0, write out a fresh copy from the in-core sb.
Signed-off-by: Darrick J. Wong <darrick.wong@xxxxxxxxxx>
---
fs/xfs/scrub/agheader.c | 35 +++++++++++++++++++++++++++++++++++
fs/xfs/scrub/repair.h | 1 +
fs/xfs/scrub/scrub.c | 1 +
3 files changed, 37 insertions(+)
diff --git a/fs/xfs/scrub/agheader.c b/fs/xfs/scrub/agheader.c
index 8507153..d59444c 100644
--- a/fs/xfs/scrub/agheader.c
+++ b/fs/xfs/scrub/agheader.c
@@ -472,6 +472,41 @@ xfs_scrub_superblock(
return error;
}
+/* Repair the superblock. */
+int
+xfs_repair_superblock(
+ struct xfs_scrub_context *sc)
+{
+ struct xfs_mount *mp = sc->mp;
+ struct xfs_buf *bp;
+ struct xfs_dsb *sbp;
+ xfs_agnumber_t agno;
+ int error;
+
+ /* Don't try to repair AG 0's sb; let xfs_repair deal with it. */
+ agno = sc->sm->sm_agno;
+ if (agno == 0)
+ return -EOPNOTSUPP;
+
+ error = xfs_trans_read_buf(mp, sc->tp, mp->m_ddev_targp,
+ XFS_AG_DADDR(mp, agno, XFS_SB_BLOCK(mp)),
+ XFS_FSS_TO_BB(mp, 1), 0, &bp, NULL);
+ if (error)
+ return error;
+ bp->b_ops = &xfs_sb_buf_ops;
+
+ /* Copy AG 0's superblock to this one. */
+ sbp = XFS_BUF_TO_SBP(bp);
+ memset(sbp, 0, mp->m_sb.sb_sectsize);
+ xfs_sb_to_disk(sbp, &mp->m_sb);
+ sbp->sb_bad_features2 = sbp->sb_features2;
+
+ /* Write this to disk. */
+ xfs_trans_buf_set_type(sc->tp, bp, XFS_BLFT_SB_BUF);
+ xfs_trans_log_buf(sc->tp, bp, 0, mp->m_sb.sb_sectsize - 1);
+ return error;
+}
+
/* AGF */
/* Tally freespace record lengths. */
diff --git a/fs/xfs/scrub/repair.h b/fs/xfs/scrub/repair.h
index e0d3690..fc5dcaa 100644
--- a/fs/xfs/scrub/repair.h
+++ b/fs/xfs/scrub/repair.h
@@ -70,5 +70,6 @@ xfs_extlen_t xfs_repair_calc_ag_resblks(struct xfs_scrub_context *sc);
int xfs_repair_setup_btree_extent_collection(struct xfs_scrub_context *sc);
/* Metadata repairers */
+int xfs_repair_superblock(struct xfs_scrub_context *sc);
#endif /* __XFS_SCRUB_REPAIR_H__ */
diff --git a/fs/xfs/scrub/scrub.c b/fs/xfs/scrub/scrub.c
index 9c2372e..401a446 100644
--- a/fs/xfs/scrub/scrub.c
+++ b/fs/xfs/scrub/scrub.c
@@ -216,6 +216,7 @@ static const struct xfs_scrub_meta_ops meta_scrub_ops[] = {
{ /* superblock */
.setup = xfs_scrub_setup_ag_header,
.scrub = xfs_scrub_superblock,
+ .repair = xfs_repair_superblock,
},
{ /* agf */
.setup = xfs_scrub_setup_ag_header,
--
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