[PATCH] xfs: xfs_sb_read_verify() doesn't flag bad crcs on primary sb

[Eric Sandeen <sandeen@xxxxxxxxxx>]

My earlier commit 10e6e65 deserves a layer or two of brown paper
bags.  The logic in that commit means that a CRC failure on the
primary superblock will *never* result in an error return.

Hopefully this fixes it, so that we always return the error
if it's a primary superblock, otherwise only if the filesystem
has CRCs enabled.

Signed-off-by: Eric Sandeen <sandeen@xxxxxxxxxx>
---

diff --git a/fs/xfs/xfs_sb.c b/fs/xfs/xfs_sb.c
index b7c9aea..5071ccb 100644
--- a/fs/xfs/xfs_sb.c
+++ b/fs/xfs/xfs_sb.c
@@ -614,7 +614,7 @@ xfs_sb_read_verify(
                if (!xfs_verify_cksum(bp->b_addr, be16_to_cpu(dsb->sb_sectsize),
                                      offsetof(struct xfs_sb, sb_crc))) {
                        /* Only fail bad secondaries on a known V5 filesystem */
-                       if (bp->b_bn != XFS_SB_DADDR &&
+                       if (bp->b_bn == XFS_SB_DADDR ||
                            xfs_sb_version_hascrc(&mp->m_sb)) {
                                error = EFSCORRUPTED;
                                goto out_error;