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Diffstat (limited to 'fs/xfs/xfs_sb.c')
-rw-r--r--fs/xfs/xfs_sb.c13
1 files changed, 11 insertions, 2 deletions
diff --git a/fs/xfs/xfs_sb.c b/fs/xfs/xfs_sb.c
index 13c7834b0e65..b7c9aea77f8f 100644
--- a/fs/xfs/xfs_sb.c
+++ b/fs/xfs/xfs_sb.c
@@ -588,6 +588,11 @@ xfs_sb_verify(
* single bit error could clear the feature bit and unused parts of the
* superblock are supposed to be zero. Hence a non-null crc field indicates that
* we've potentially lost a feature bit and we should check it anyway.
+ *
+ * However, past bugs (i.e. in growfs) left non-zeroed regions beyond the
+ * last field in V4 secondary superblocks. So for secondary superblocks,
+ * we are more forgiving, and ignore CRC failures if the primary doesn't
+ * indicate that the fs version is V5.
*/
static void
xfs_sb_read_verify(
@@ -608,8 +613,12 @@ xfs_sb_read_verify(
if (!xfs_verify_cksum(bp->b_addr, be16_to_cpu(dsb->sb_sectsize),
offsetof(struct xfs_sb, sb_crc))) {
- error = EFSCORRUPTED;
- goto out_error;
+ /* Only fail bad secondaries on a known V5 filesystem */
+ if (bp->b_bn != XFS_SB_DADDR &&
+ xfs_sb_version_hascrc(&mp->m_sb)) {
+ error = EFSCORRUPTED;
+ goto out_error;
+ }
}
}
error = xfs_sb_verify(bp, true);