# \[PATCH 14/16\] xfs: add error injection for lazy bounce buffering - From: Christoph Hellwig \ - Date: 2026-09-09 06:10:56 - List: linux-block - Page: https://ratatoskr.run/linux-block/2026/09/17535476 - Thread: https://ratatoskr.run/linux-block/2026/09/17535462/t.md ```text Add an error injection knob to exercise the lazy bounce buffering code path, i.e. to inject direct I/O re-read using the bounce buffer. Signed-off-by: Christoph Hellwig Reviewed-by: "Darrick J. Wong" --- fs/xfs/libxfs/xfs_errortag.h | 6 ++++-- fs/xfs/xfs_ioend.c | 5 ++++- 2 files changed, 8 insertions(+), 3 deletions(-) diff --git a/fs/xfs/libxfs/xfs_errortag.h b/fs/xfs/libxfs/xfs_errortag.h index 6de207fed2d8..2dc441da0333 100644 --- a/fs/xfs/libxfs/xfs_errortag.h +++ b/fs/xfs/libxfs/xfs_errortag.h @@ -75,7 +75,8 @@ #define XFS_ERRTAG_METAFILE_RESV_CRITICAL 45 #define XFS_ERRTAG_FORCE_ZERO_RANGE 46 #define XFS_ERRTAG_ZONE_RESET 47 -#define XFS_ERRTAG_MAX 48 +#define XFS_ERRTAG_BOUNCE_REREAD 48 +#define XFS_ERRTAG_MAX 49 /* * Random factors for above tags, 1 means always, 2 means 1/2 time, etc. @@ -137,7 +138,8 @@ 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(ZONE_RESET, zone_reset, 1) +XFS_ERRTAG(ZONE_RESET, zone_reset, 1) \ +XFS_ERRTAG(BOUNCE_REREAD, bounce_reread, XFS_RANDOM_DEFAULT) #endif /* XFS_ERRTAG */ #endif /* __XFS_ERRORTAG_H_ */ diff --git a/fs/xfs/xfs_ioend.c b/fs/xfs/xfs_ioend.c index 4fba8558d8d2..e70be5b86f0b 100644 --- a/fs/xfs/xfs_ioend.c +++ b/fs/xfs/xfs_ioend.c @@ -16,6 +16,8 @@ #include "xfs_reflink.h" #include "xfs_zone_alloc.h" #include "xfs_ioend.h" +#include "xfs_error.h" +#include "xfs_errortag.h" #include static void @@ -107,7 +109,8 @@ xfs_end_io_read( * but right now we can't distinguish them from other * (i.e, reftag) errors. */ - if (error) { + if (error || + XFS_TEST_ERROR(mp, XFS_ERRTAG_BOUNCE_REREAD)) { xfs_read_bounce_and_resubmit(ioend); return; } -- 2.53.0 ```