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authorFUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>2010-07-09 09:38:26 +0900
committerJens Axboe <jaxboe@fusionio.com>2010-08-07 18:52:41 +0200
commite96f6abe02fc3320d669985443e8c68ff8e83294 (patch)
tree52129ba43d1e57fb4446facde52071efb3a65ff0
parent16f2319fd67b169c0b34391d3fa0870fff129891 (diff)
scsi: use REQ_TYPE_FS for flush request
scsi-ml uses REQ_TYPE_BLOCK_PC for flush requests from file systems. The definition of REQ_TYPE_BLOCK_PC is that we don't retry requests even when we can (e.g. UNIT ATTENTION) and we send the response to the callers (then the callers can decide what they want). We need a workaround such as the commit 77a4229719e511a0d38d9c355317ae1469adeb54 to retry BLOCK_PC flush requests. We will need the similar workaround for discard requests too since SCSI-ml handle them as BLOCK_PC internally. This uses REQ_TYPE_FS for flush requests from file systems instead of REQ_TYPE_BLOCK_PC. scsi-ml retries only REQ_TYPE_FS requests that have data to transfer when we can retry them (e.g. UNIT_ATTENTION). However, we also need to retry REQ_TYPE_FS requests without data because the callers don't. This also changes scsi_check_sense() to retry all the REQ_TYPE_FS requests when appropriate. Thanks to scsi_noretry_cmd(), REQ_TYPE_BLOCK_PC requests don't be retried as before. Note that basically, this reverts the commit 77a4229719e511a0d38d9c355317ae1469adeb54 since now we use REQ_TYPE_FS for flush requests. Signed-off-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp> Signed-off-by: Jens Axboe <jaxboe@fusionio.com>
-rw-r--r--drivers/scsi/scsi_error.c19
-rw-r--r--drivers/scsi/sd.c2
2 files changed, 4 insertions, 17 deletions
diff --git a/drivers/scsi/scsi_error.c b/drivers/scsi/scsi_error.c
index 1b88af89d0c7..2768bf6ffe59 100644
--- a/drivers/scsi/scsi_error.c
+++ b/drivers/scsi/scsi_error.c
@@ -307,20 +307,7 @@ static int scsi_check_sense(struct scsi_cmnd *scmd)
(sshdr.asc == 0x04) && (sshdr.ascq == 0x02))
return FAILED;
- if (scmd->request->cmd_flags & REQ_HARDBARRIER)
- /*
- * barrier requests should always retry on UA
- * otherwise block will get a spurious error
- */
- return NEEDS_RETRY;
- else
- /*
- * for normal (non barrier) commands, pass the
- * UA upwards for a determination in the
- * completion functions
- */
- return SUCCESS;
-
+ return NEEDS_RETRY;
/* these three are not supported */
case COPY_ABORTED:
case VOLUME_OVERFLOW:
@@ -1336,7 +1323,9 @@ int scsi_noretry_cmd(struct scsi_cmnd *scmd)
* assume caller has checked sense and determinted
* the check condition was retryable.
*/
- return (scmd->request->cmd_flags & REQ_FAILFAST_DEV);
+ if (scmd->request->cmd_flags & REQ_FAILFAST_DEV ||
+ scmd->request->cmd_type == REQ_TYPE_BLOCK_PC)
+ return 1;
}
return 0;
diff --git a/drivers/scsi/sd.c b/drivers/scsi/sd.c
index e63b85ac8cd1..108daead7ae8 100644
--- a/drivers/scsi/sd.c
+++ b/drivers/scsi/sd.c
@@ -477,8 +477,6 @@ static int scsi_setup_discard_cmnd(struct scsi_device *sdp, struct request *rq)
static int scsi_setup_flush_cmnd(struct scsi_device *sdp, struct request *rq)
{
- /* for now, we use REQ_TYPE_BLOCK_PC. */
- rq->cmd_type = REQ_TYPE_BLOCK_PC;
rq->timeout = SD_TIMEOUT;
rq->retries = SD_MAX_RETRIES;
rq->cmd[0] = SYNCHRONIZE_CACHE;