[PATCH v15 13/19] scsi: scsi_debug: Support injecting unaligned write errors

Bart Van Assche
2023-11-14T21:19:07Z

Allow user space software, e.g. a blktests test, to inject unaligned
write errors.

Acked-by: Douglas Gilbert <dgilbert@interlog.com>
Reviewed-by: Damien Le Moal <dlemoal@kernel.org>
Cc: Martin K. Petersen <martin.petersen@oracle.com>
Cc: Christoph Hellwig <hch@lst.de>
Cc: Ming Lei <ming.lei@redhat.com>
Signed-off-by: Bart Van Assche <bvanassche@acm.org>
---
drivers/scsi/scsi_debug.c | 12 +++++++++++-
1 file changed, 11 insertions(+), 1 deletion(-)

diff --git a/drivers/scsi/scsi_debug.c b/drivers/scsi/scsi_debug.c
index 6f0c78e727ec..23ea090698df 100644
--- a/drivers/scsi/scsi_debug.c
+++ b/drivers/scsi/scsi_debug.c
@@ -183,6 +183,7 @@ static const char *sdebug_version_date = "20210520";
#define SDEBUG_OPT_NO_CDB_NOISE 0x4000
#define SDEBUG_OPT_HOST_BUSY 0x8000
#define SDEBUG_OPT_CMD_ABORT 0x10000
+#define SDEBUG_OPT_UNALIGNED_WRITE 0x20000
#define SDEBUG_OPT_ALL_NOISE (SDEBUG_OPT_NOISE | SDEBUG_OPT_Q_NOISE | \
SDEBUG_OPT_RESET_NOISE)
#define SDEBUG_OPT_ALL_INJECTING (SDEBUG_OPT_RECOVERED_ERR | \
@@ -190,7 +191,8 @@ static const char *sdebug_version_date = "20210520";
SDEBUG_OPT_DIF_ERR | SDEBUG_OPT_DIX_ERR | \
SDEBUG_OPT_SHORT_TRANSFER | \
SDEBUG_OPT_HOST_BUSY | \
- SDEBUG_OPT_CMD_ABORT)
+ SDEBUG_OPT_CMD_ABORT | \
+ SDEBUG_OPT_UNALIGNED_WRITE)
#define SDEBUG_OPT_RECOV_DIF_DIX (SDEBUG_OPT_RECOVERED_ERR | \
SDEBUG_OPT_DIF_ERR | SDEBUG_OPT_DIX_ERR)

@@ -3898,6 +3900,14 @@ static int resp_write_dt0(struct scsi_cmnd *scp, struct sdebug_dev_info *devip)
struct sdeb_store_info *sip = devip2sip(devip, true);
u8 *cmd = scp->cmnd;

+ if (unlikely(sdebug_opts & SDEBUG_OPT_UNALIGNED_WRITE &&
+ atomic_read(&sdeb_inject_pending))) {
+ atomic_set(&sdeb_inject_pending, 0);
+ mk_sense_buffer(scp, ILLEGAL_REQUEST, LBA_OUT_OF_RANGE,
+ UNALIGNED_WRITE_ASCQ);
+ return check_condition_result;
+ }
+
switch (cmd[0]) {
case WRITE_16:
ei_lba = 0;