xfs: random buffer write failure errortag

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>

diff --git a/fs/xfs/libxfs/xfs_errortag.h b/fs/xfs/libxfs/xfs_errortag.h
index 79e6c4f..2486dab 100644 (file)
--- a/fs/xfs/libxfs/xfs_errortag.h
+++ b/fs/xfs/libxfs/xfs_errortag.h
@@ -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_ */

diff --git a/fs/xfs/xfs_buf.c b/fs/xfs/xfs_buf.c
index 3918270..9d8841a 100644 (file)
--- a/fs/xfs/xfs_buf.c
+++ b/fs/xfs/xfs_buf.c
@@ -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

diff --git a/fs/xfs/xfs_error.c b/fs/xfs/xfs_error.c
index a21e9cc..7f6e208 100644 (file)
--- a/fs/xfs/xfs_error.c
+++ b/fs/xfs/xfs_error.c
@@ -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,
 };