xfs: add zone reset error injection

Add a new errortag to test that zone reset errors are handled correctly.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Carlos Maiolino <cmaiolino@redhat.com>
Reviewed-by: Hans Holmberg <hans.holmberg@wdc.com>
Reviewed-by: Darrick J. Wong <djwong@kernel.org>
Signed-off-by: Carlos Maiolino <cem@kernel.org>

Author: Christoph Hellwig

fs/xfs/libxfs/xfs_errortag.h

@@ -74,7 +74,8 @@
 #define XFS_ERRTAG_EXCHMAPS_FINISH_ONE			44
 #define XFS_ERRTAG_METAFILE_RESV_CRITICAL		45
 #define XFS_ERRTAG_FORCE_ZERO_RANGE			46
-#define XFS_ERRTAG_MAX					47
+#define XFS_ERRTAG_ZONE_RESET				47
+#define XFS_ERRTAG_MAX					48
 
 /*
  * Random factors for above tags, 1 means always, 2 means 1/2 time, etc.
@@ -135,7 +136,8 @@ XFS_ERRTAG(WB_DELAY_MS,		wb_delay_ms,		3000) \
 XFS_ERRTAG(WRITE_DELAY_MS,	write_delay_ms,		3000) \
 XFS_ERRTAG(EXCHMAPS_FINISH_ONE,	exchmaps_finish_one,	1) \
 XFS_ERRTAG(METAFILE_RESV_CRITICAL, metafile_resv_crit,	4) \
-XFS_ERRTAG(FORCE_ZERO_RANGE,	force_zero_range,	4)
+XFS_ERRTAG(FORCE_ZERO_RANGE,	force_zero_range,	4) \
+XFS_ERRTAG(ZONE_RESET,		zone_reset,		1)
 #endif /* XFS_ERRTAG */
 
 #endif /* __XFS_ERRORTAG_H_ */

fs/xfs/xfs_zone_gc.c

@@ -16,6 +16,8 @@
 #include "xfs_rmap.h"
 #include "xfs_rtbitmap.h"
 #include "xfs_rtrmap_btree.h"
+#include "xfs_errortag.h"
+#include "xfs_error.h"
 #include "xfs_zone_alloc.h"
 #include "xfs_zone_priv.h"
 #include "xfs_zones.h"
@@ -898,9 +900,17 @@ xfs_submit_zone_reset_bio(
 	struct xfs_rtgroup	*rtg,
 	struct bio		*bio)
 {
+	struct xfs_mount	*mp = rtg_mount(rtg);
+
 	trace_xfs_zone_reset(rtg);
 
 	ASSERT(rtg_rmap(rtg)->i_used_blocks == 0);
+
+	if (XFS_TEST_ERROR(mp, XFS_ERRTAG_ZONE_RESET)) {
+		bio_io_error(bio);
+		return;
+	}
+
 	bio->bi_iter.bi_sector = xfs_gbno_to_daddr(&rtg->rtg_group, 0);
 	if (!bdev_zone_is_seq(bio->bi_bdev, bio->bi_iter.bi_sector)) {
 		/*
@@ -913,8 +923,7 @@ xfs_submit_zone_reset_bio(
 		}
 		bio->bi_opf &= ~REQ_OP_ZONE_RESET;
 		bio->bi_opf |= REQ_OP_DISCARD;
-		bio->bi_iter.bi_size =
-			XFS_FSB_TO_B(rtg_mount(rtg), rtg_blocks(rtg));
+		bio->bi_iter.bi_size = XFS_FSB_TO_B(mp, rtg_blocks(rtg));
 	}
 
 	submit_bio(bio);