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[PATCH] xfs: return -EINVAL instead of -EUCLEAN when mounting non-xfs

To: xfs@xxxxxxxxxxx
Subject: [PATCH] xfs: return -EINVAL instead of -EUCLEAN when mounting non-xfs
From: Sergei Trofimovich <slyfox@xxxxxxxxxx>
Date: Sun, 30 Dec 2012 02:16:50 +0300
Cc: Sergei Trofimovich <slyfox@xxxxxxxxxx>, Ben Myers <bpm@xxxxxxx>, Alex Elder <elder@xxxxxxxxxx>, linux-kernel@xxxxxxxxxxxxxxx, Dave Chinner <dchinner@xxxxxxxxxx>, Phil White <pwhite@xxxxxxx>
In-reply-to: <20121230015615.6cc9e03c@sf>
References: <20121230015615.6cc9e03c@sf>
It fixes boot panic when trying to boot from btrfs filesystem.
kernel tries to mount as xfs and gets fatal -EUCLEAN:

[    0.170000] VFS: Cannot open root device "ubda" or unknown-block(98,0): 
error -117
[    0.170000] Please append a correct "root=" boot option; here are the 
available partitions:
[    0.170000] 6200         1048576 ubda  driver: uml-blkdev
[    0.170000] Kernel panic - not syncing: VFS: Unable to mount root fs on 

init/do_mounts.c expects only -EINVAL as 'retry another' option.
Fixes regression introduced by commit 98021821a502db347bd9c7671beeee6e8ce07ea6

Signed-off-by: Sergei Trofimovich <slyfox@xxxxxxxxxx>
CC: Ben Myers <bpm@xxxxxxx>
CC: Alex Elder <elder@xxxxxxxxxx>
CC: xfs@xxxxxxxxxxx
CC: linux-kernel@xxxxxxxxxxxxxxx
CC: Dave Chinner <dchinner@xxxxxxxxxx>
CC: Phil White <pwhite@xxxxxxx>
 fs/xfs/xfs_mount.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/fs/xfs/xfs_mount.c b/fs/xfs/xfs_mount.c
index da50846..379cac1 100644
--- a/fs/xfs/xfs_mount.c
+++ b/fs/xfs/xfs_mount.c
@@ -641,41 +641,41 @@ xfs_sb_read_verify(
  * We may be probed for a filesystem match, so we may not want to emit
  * messages when the superblock buffer is not actually an XFS superblock.
  * If we find an XFS superblock, the run a normal, noisy mount because we are
  * really going to mount it and want to know about errors.
 static void
        struct xfs_buf  *bp)
        struct xfs_sb   sb;
        xfs_sb_from_disk(&sb, XFS_BUF_TO_SBP(bp));
        if (sb.sb_magicnum == XFS_SB_MAGIC) {
                /* XFS filesystem, verify noisily! */
        /* quietly fail */
-       xfs_buf_ioerror(bp, EFSCORRUPTED);
+       xfs_buf_ioerror(bp, EINVAL);
 static void
        struct xfs_buf  *bp)
 const struct xfs_buf_ops xfs_sb_buf_ops = {
        .verify_read = xfs_sb_read_verify,
        .verify_write = xfs_sb_write_verify,
 static const struct xfs_buf_ops xfs_sb_quiet_buf_ops = {
        .verify_read = xfs_sb_quiet_read_verify,
        .verify_write = xfs_sb_write_verify,

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