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scsi: sd: Have midlayer retry sd_sync_cache() errors

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This has sd_sync_cache() have the SCSI midlayer retry errors instead of
driving them itself.

There is one behavior change where we no longer retry when
scsi_execute_cmd() returns < 0, but we should be ok. We don't need to retry
for failures like the queue being removed, and for the case where there are
no tags/reqs the block layer waits/retries for us. For possible memory
allocation failures from blk_rq_map_kern() we use GFP_NOIO, so retrying
will probably not help.

Signed-off-by: Mike Christie <michael.christie@oracle.com>
Link: https://lore.kernel.org/r/20240123002220.129141-10-michael.christie@oracle.com
Acked-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
This commit is contained in:
Mike Christie
2024-01-22 18:22:10 -06:00
committed by Martin K. Petersen
parent 5dbf104736
commit 183053203d
1 changed files with 17 additions and 18 deletions
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35
drivers/scsi/sd.c
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@@ -1645,36 +1645,35 @@ static unsigned int sd_check_events(struct gendisk *disk, unsigned int clearing)
static int sd_sync_cache(struct scsi_disk *sdkp)
{
int retries, res;
int res;
struct scsi_device *sdp = sdkp->device;
const int timeout = sdp->request_queue->rq_timeout
* SD_FLUSH_TIMEOUT_MULTIPLIER;
/* Leave the rest of the command zero to indicate flush everything. */
const unsigned char cmd[16] = { sdp->use_16_for_sync ?
SYNCHRONIZE_CACHE_16 : SYNCHRONIZE_CACHE };
struct scsi_sense_hdr sshdr;
struct scsi_failure failure_defs[] = {
{
.allowed = 3,
.result = SCMD_FAILURE_RESULT_ANY,
},
{}
};
struct scsi_failures failures = {
.failure_definitions = failure_defs,
};
const struct scsi_exec_args exec_args = {
.req_flags = BLK_MQ_REQ_PM,
.sshdr = &sshdr,
.failures = &failures,
};
if (!scsi_device_online(sdp))
return -ENODEV;
for (retries = 3; retries > 0; --retries) {
unsigned char cmd[16] = { 0 };
if (sdp->use_16_for_sync)
cmd[0] = SYNCHRONIZE_CACHE_16;
else
cmd[0] = SYNCHRONIZE_CACHE;
/*
* Leave the rest of the command zero to indicate
* flush everything.
*/
res = scsi_execute_cmd(sdp, cmd, REQ_OP_DRV_IN, NULL, 0,
timeout, sdkp->max_retries, &exec_args);
if (res == 0)
break;
}
res = scsi_execute_cmd(sdp, cmd, REQ_OP_DRV_IN, NULL, 0, timeout,
sdkp->max_retries, &exec_args);
if (res) {
sd_print_result(sdkp, "Synchronize Cache(10) failed", res);