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xfs: random buffer write failure errortag

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Introduce an error tag to randomly fail async buffer writes. This is
primarily to facilitate testing of the XFS error configuration
mechanism.

Signed-off-by: Brian Foster <bfoster@redhat.com>
Reviewed-by: Allison Collins <allison.henderson@oracle.com>
Reviewed-by: Dave Chinner <dchinner@redhat.com>
Reviewed-by: Darrick J. Wong <darrick.wong@oracle.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
This commit is contained in:
Brian Foster 2020-05-06 13:29:19 -07:00 committed by Darrick J. Wong
parent 88fc187984
commit 7376d74547
3 changed files with 12 additions and 1 deletions
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4
fs/xfs/libxfs/xfs_errortag.h
View file

@ -55,7 +55,8 @@
#define XFS_ERRTAG_FORCE_SCRUB_REPAIR 32
#define XFS_ERRTAG_FORCE_SUMMARY_RECALC 33
#define XFS_ERRTAG_IUNLINK_FALLBACK 34
#define XFS_ERRTAG_MAX 35
#define XFS_ERRTAG_BUF_IOERROR 35
#define XFS_ERRTAG_MAX 36
/*
* Random factors for above tags, 1 means always, 2 means 1/2 time, etc.
@ -95,5 +96,6 @@
#define XFS_RANDOM_FORCE_SCRUB_REPAIR 1
#define XFS_RANDOM_FORCE_SUMMARY_RECALC 1
#define XFS_RANDOM_IUNLINK_FALLBACK (XFS_RANDOM_DEFAULT/10)
#define XFS_RANDOM_BUF_IOERROR XFS_RANDOM_DEFAULT
#endif /* __XFS_ERRORTAG_H_ */

6
fs/xfs/xfs_buf.c
View file

@ -1289,6 +1289,12 @@ xfs_buf_bio_end_io(
struct bio *bio)
{
struct xfs_buf *bp = (struct xfs_buf *)bio->bi_private;
struct xfs_mount *mp = bp->b_mount;
if (!bio->bi_status &&
(bp->b_flags & XBF_WRITE) && (bp->b_flags & XBF_ASYNC) &&
XFS_TEST_ERROR(false, mp, XFS_ERRTAG_BUF_IOERROR))
bio->bi_status = BLK_STS_IOERR;
/*
* don't overwrite existing errors - otherwise we can lose errors on

3
fs/xfs/xfs_error.c
View file

@ -53,6 +53,7 @@ static unsigned int xfs_errortag_random_default[] = {
XFS_RANDOM_FORCE_SCRUB_REPAIR,
XFS_RANDOM_FORCE_SUMMARY_RECALC,
XFS_RANDOM_IUNLINK_FALLBACK,
XFS_RANDOM_BUF_IOERROR,
};
struct xfs_errortag_attr {
@ -162,6 +163,7 @@ XFS_ERRORTAG_ATTR_RW(buf_lru_ref, XFS_ERRTAG_BUF_LRU_REF);
XFS_ERRORTAG_ATTR_RW(force_repair, XFS_ERRTAG_FORCE_SCRUB_REPAIR);
XFS_ERRORTAG_ATTR_RW(bad_summary, XFS_ERRTAG_FORCE_SUMMARY_RECALC);
XFS_ERRORTAG_ATTR_RW(iunlink_fallback, XFS_ERRTAG_IUNLINK_FALLBACK);
XFS_ERRORTAG_ATTR_RW(buf_ioerror, XFS_ERRTAG_BUF_IOERROR);
static struct attribute *xfs_errortag_attrs[] = {
XFS_ERRORTAG_ATTR_LIST(noerror),
@ -199,6 +201,7 @@ static struct attribute *xfs_errortag_attrs[] = {
XFS_ERRORTAG_ATTR_LIST(force_repair),
XFS_ERRORTAG_ATTR_LIST(bad_summary),
XFS_ERRORTAG_ATTR_LIST(iunlink_fallback),
XFS_ERRORTAG_ATTR_LIST(buf_ioerror),
NULL,
};