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[PATCH 05/13] libxfs: limit superblock corruption errors to actual corru

To: xfs@xxxxxxxxxxx
Subject: [PATCH 05/13] libxfs: limit superblock corruption errors to actual corruption
From: Dave Chinner <david@xxxxxxxxxxxxx>
Date: Tue, 4 Mar 2014 19:51:49 +1100
Delivered-to: xfs@xxxxxxxxxxx
In-reply-to: <1393923117-9559-1-git-send-email-david@xxxxxxxxxxxxx>
References: <1393923117-9559-1-git-send-email-david@xxxxxxxxxxxxx>
From: Dave Chinner <dchinner@xxxxxxxxxx>

[userspace port]

Today, if


detects superblock corruption, it'll be extremely noisy, dumping
2 stacks, 2 hexdumps, etc.

This is because we call XFS_CORRUPTION_ERROR in xfs_mount_validate_sb
as well as in xfs_sb_read_verify.

Also, *any* errors in xfs_mount_validate_sb which are not corruption
per se; things like too-big-blocksize, bad version, bad magic, v1 dirs,
rw-incompat etc - things which do not return EFSCORRUPTED - will
still do the whole XFS_CORRUPTION_ERROR spew when xfs_sb_read_verify
sees any error at all.  And it suggests to the user that they
should run xfs_repair, even if the root cause of the mount failure
is a simple incompatibility.

I'll submit that the probably-not-corrupted errors don't warrant
this much noise, so this patch removes the warning for anything
other than EFSCORRUPTED returns, and replaces the lower-level
XFS_CORRUPTION_ERROR with an xfs_notice().

Signed-off-by: Dave Chinner <dchinner@xxxxxxxxxx>
 libxfs/xfs_sb.c | 5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

diff --git a/libxfs/xfs_sb.c b/libxfs/xfs_sb.c
index 6ad99a5..05bc860 100644
--- a/libxfs/xfs_sb.c
+++ b/libxfs/xfs_sb.c
@@ -266,8 +266,7 @@ xfs_mount_validate_sb(
            sbp->sb_dblocks == 0                                        ||
            sbp->sb_dblocks > XFS_MAX_DBLOCKS(sbp)                      ||
            sbp->sb_dblocks < XFS_MIN_DBLOCKS(sbp))) {
-               XFS_CORRUPTION_ERROR("SB sanity check failed",
-                               XFS_ERRLEVEL_LOW, mp, sbp);
+               xfs_notice(mp, "SB sanity check failed");
                return XFS_ERROR(EFSCORRUPTED);
@@ -580,7 +579,7 @@ xfs_sb_read_verify(
        if (error) {
-               if (error != EWRONGFS)
+               if (error == EFSCORRUPTED)
                        XFS_CORRUPTION_ERROR(__func__, XFS_ERRLEVEL_LOW,
                                             mp, bp->b_addr);
                xfs_buf_ioerror(bp, error);

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