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xfs: Introduce XFS_PTAG_VERIFIER_ERROR panic mask

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Currently we have a few PTAGs in place allowing us to transform a filesystem
error in a BUG() call.  However, we don't have a panic tag for corrupt
metadata, so introduce XFS_PTAG_VERIFIER_ERROR so that the administrator can
use the fs.xfs.panic_mask sysctl knob to convert any error detected by buffer
verifiers into a kernel panic.

Signed-off-by: Marco Benatto <mbenatto@redhat.com>
Reviewed-by: Eric Sandeen <sandeen@redhat.com>
[darrick: light editing of commit message]
Reviewed-by: Darrick J. Wong <darrick.wong@oracle.com>
Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
This commit is contained in:
Marco Benatto 2019-02-01 09:12:20 -08:00 committed by Darrick J. Wong
parent e88db81645
commit d519da41e2
4 changed files with 6 additions and 3 deletions
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3
Documentation/filesystems/xfs.txt
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@ -272,7 +272,7 @@ The following sysctls are available for the XFS filesystem:
XFS_ERRLEVEL_LOW: 1 XFS_ERRLEVEL_LOW: 1
XFS_ERRLEVEL_HIGH: 5 XFS_ERRLEVEL_HIGH: 5
fs.xfs.panic_mask (Min: 0 Default: 0 Max: 255) fs.xfs.panic_mask (Min: 0 Default: 0 Max: 256)
Causes certain error conditions to call BUG(). Value is a bitmask; Causes certain error conditions to call BUG(). Value is a bitmask;
OR together the tags which represent errors which should cause panics: OR together the tags which represent errors which should cause panics:
@ -285,6 +285,7 @@ The following sysctls are available for the XFS filesystem:
XFS_PTAG_SHUTDOWN_IOERROR 0x00000020 XFS_PTAG_SHUTDOWN_IOERROR 0x00000020
XFS_PTAG_SHUTDOWN_LOGERROR 0x00000040 XFS_PTAG_SHUTDOWN_LOGERROR 0x00000040
XFS_PTAG_FSBLOCK_ZERO 0x00000080 XFS_PTAG_FSBLOCK_ZERO 0x00000080
XFS_PTAG_VERIFIER_ERROR 0x00000100
This option is intended for debugging only. This option is intended for debugging only.

3
fs/xfs/xfs_error.c
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@ -357,7 +357,8 @@ xfs_buf_verifier_error(
fa = failaddr ? failaddr : __return_address; fa = failaddr ? failaddr : __return_address;
__xfs_buf_ioerror(bp, error, fa); __xfs_buf_ioerror(bp, error, fa);
xfs_alert(mp, "Metadata %s detected at %pS, %s block 0x%llx %s", xfs_alert_tag(mp, XFS_PTAG_VERIFIER_ERROR,
"Metadata %s detected at %pS, %s block 0x%llx %s",
bp->b_error == -EFSBADCRC ? "CRC error" : "corruption", bp->b_error == -EFSBADCRC ? "CRC error" : "corruption",
fa, bp->b_ops->name, bp->b_bn, name); fa, bp->b_ops->name, bp->b_bn, name);

1
fs/xfs/xfs_error.h
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@ -98,5 +98,6 @@ extern int xfs_errortag_clearall(struct xfs_mount *mp);
#define XFS_PTAG_SHUTDOWN_IOERROR 0x00000020 #define XFS_PTAG_SHUTDOWN_IOERROR 0x00000020
#define XFS_PTAG_SHUTDOWN_LOGERROR 0x00000040 #define XFS_PTAG_SHUTDOWN_LOGERROR 0x00000040
#define XFS_PTAG_FSBLOCK_ZERO 0x00000080 #define XFS_PTAG_FSBLOCK_ZERO 0x00000080
#define XFS_PTAG_VERIFIER_ERROR 0x00000100
#endif /* __XFS_ERROR_H__ */ #endif /* __XFS_ERROR_H__ */

2
fs/xfs/xfs_globals.c
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@ -16,7 +16,7 @@ xfs_param_t xfs_params = {
/* MIN DFLT MAX */ /* MIN DFLT MAX */
.sgid_inherit = { 0, 0, 1 }, .sgid_inherit = { 0, 0, 1 },
.symlink_mode = { 0, 0, 1 }, .symlink_mode = { 0, 0, 1 },
.panic_mask = { 0, 0, 255 }, .panic_mask = { 0, 0, 256 },
.error_level = { 0, 3, 11 }, .error_level = { 0, 3, 11 },
.syncd_timer = { 1*100, 30*100, 7200*100}, .syncd_timer = { 1*100, 30*100, 7200*100},
.stats_clear = { 0, 0, 1 }, .stats_clear = { 0, 0, 1 },