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scsi: core: Support failing requests while recovering

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The current behavior for SCSI commands submitted while error recovery is
ongoing is to retry command submission after error recovery has finished.
See also the scsi_host_in_recovery() check in scsi_host_queue_ready(). Add
support for failing SCSI commands while host recovery is in progress. This
functionality will be used to fix a deadlock in the UFS driver.

Cc: Christoph Hellwig <hch@lst.de>
Cc: Ming Lei <ming.lei@redhat.com>
Cc: John Garry <john.garry@huawei.com>
Cc: Mike Christie <michael.christie@oracle.com>
Cc: Hannes Reinecke <hare@suse.de>
Signed-off-by: Bart Van Assche <bvanassche@acm.org>
Link: https://lore.kernel.org/r/20221018202958.1902564-4-bvanassche@acm.org
Reviewed-by: Mike Christie <michael.christie@oracle.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
This commit is contained in:
Bart Van Assche 2022-10-18 13:29:51 -07:00 committed by Martin K. Petersen
parent dee7121e8c
commit 310bcaef6d
2 changed files with 7 additions and 4 deletions
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8
drivers/scsi/scsi_lib.c
View file

@ -1341,9 +1341,6 @@ static inline int scsi_host_queue_ready(struct request_queue *q,
struct scsi_device *sdev,
struct scsi_cmnd *cmd)
{
if (scsi_host_in_recovery(shost))
return 0;
if (atomic_read(&shost->host_blocked) > 0) {
if (scsi_host_busy(shost) > 0)
goto starved;
@ -1732,6 +1729,11 @@ static blk_status_t scsi_queue_rq(struct blk_mq_hw_ctx *hctx,
ret = BLK_STS_RESOURCE;
if (!scsi_target_queue_ready(shost, sdev))
goto out_put_budget;
if (unlikely(scsi_host_in_recovery(shost))) {
if (cmd->flags & SCMD_FAIL_IF_RECOVERING)
ret = BLK_STS_OFFLINE;
goto out_dec_target_busy;
}
if (!scsi_host_queue_ready(q, shost, sdev, cmd))
goto out_dec_target_busy;

3
include/scsi/scsi_cmnd.h
View file

@ -52,8 +52,9 @@ struct scsi_pointer {
#define SCMD_TAGGED (1 << 0)
#define SCMD_INITIALIZED (1 << 1)
#define SCMD_LAST (1 << 2)
#define SCMD_FAIL_IF_RECOVERING (1 << 4)
/* flags preserved across unprep / reprep */
#define SCMD_PRESERVED_FLAGS (SCMD_INITIALIZED)
#define SCMD_PRESERVED_FLAGS (SCMD_INITIALIZED | SCMD_FAIL_IF_RECOVERING)
/* for scmd->state */
#define SCMD_STATE_COMPLETE 0