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[PATCH 1/6] xfs: limit superblock corruption errors to actual corruption

To: Eric Sandeen <sandeen@xxxxxxxxxx>, xfs-oss <xfs@xxxxxxxxxxx>
Subject: [PATCH 1/6] xfs: limit superblock corruption errors to actual corruption
From: Eric Sandeen <sandeen@xxxxxxxxxxx>
Date: Sun, 09 Feb 2014 20:20:33 -0600
Delivered-to: xfs@xxxxxxxxxxx
In-reply-to: <52F83630.4020008@xxxxxxxxxx>
References: <52F83630.4020008@xxxxxxxxxx>
User-agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.9; rv:24.0) Gecko/20100101 Thunderbird/24.2.0
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: Eric Sandeen <sandeen@xxxxxxxxxx>

Thanks to Brian for pointing out this better solution to my
earlier patch.

 fs/xfs/xfs_sb.c |    5 ++---
 1 files changed, 2 insertions(+), 3 deletions(-)

diff --git a/fs/xfs/xfs_sb.c b/fs/xfs/xfs_sb.c
index b7c9aea..efaef71 100644
--- a/fs/xfs/xfs_sb.c
+++ b/fs/xfs/xfs_sb.c
@@ -295,8 +295,7 @@ 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);
@@ -625,7 +624,7 @@ 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);
-- 1.7.1

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