[PATCH 5.4 CANDIDATE 13/17] xfs: report corruption only as a regular error

[Chandan Babu R <chandan.babu@oracle.com>]

From: "Darrick J. Wong" <darrick.wong@oracle.com>

commit 6519f708cc355c4834edbe1885c8542c0e7ef907 uptream.

[ Slightly modify fs/xfs/xfs_linux.h to resolve merge conflicts ]

Redefine XFS_IS_CORRUPT so that it reports corruptions only via
xfs_corruption_report.  Since these are on-disk contents (and not checks
of internal state), we don't ever want to panic the kernel.  This also
amends the corruption report to recommend unmounting and running
xfs_repair.

Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Chandan Babu R <chandan.babu@oracle.com>
---
 fs/xfs/xfs_error.c | 2 +-
 fs/xfs/xfs_linux.h | 6 ++++++
 2 files changed, 7 insertions(+), 1 deletion(-)

diff --git a/fs/xfs/xfs_error.c b/fs/xfs/xfs_error.c
index e9acd58248f9..182b70464b71 100644
--- a/fs/xfs/xfs_error.c
+++ b/fs/xfs/xfs_error.c
@@ -335,7 +335,7 @@ xfs_corruption_error(
 	int			linenum,
 	xfs_failaddr_t		failaddr)
 {
-	if (level <= xfs_error_level)
+	if (buf && level <= xfs_error_level)
 		xfs_hex_dump(buf, bufsize);
 	xfs_error_report(tag, level, mp, filename, linenum, failaddr);
 	xfs_alert(mp, "Corruption detected. Unmount and run xfs_repair");
diff --git a/fs/xfs/xfs_linux.h b/fs/xfs/xfs_linux.h
index f4f52ac5628c..4f6f09157f0d 100644
--- a/fs/xfs/xfs_linux.h
+++ b/fs/xfs/xfs_linux.h
@@ -217,6 +217,12 @@ int xfs_rw_bdev(struct block_device *bdev, sector_t sector, unsigned int count,
 #endif /* XFS_WARN */
 #endif /* DEBUG */
 
+#define XFS_IS_CORRUPT(mp, expr)	\
+	(unlikely(expr) ? xfs_corruption_error(#expr, XFS_ERRLEVEL_LOW, (mp), \
+					       NULL, 0, __FILE__, __LINE__, \
+					       __this_address), \
+			  true : false)
+
 #define STATIC static noinline
 
 #ifdef CONFIG_XFS_RT
-- 
2.39.1