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authorFUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>2010-07-09 04:38:26 +0400
committerJens Axboe <jaxboe@fusionio.com>2010-08-07 20:52:41 +0400
commite96f6abe02fc3320d669985443e8c68ff8e83294 (patch)
tree52129ba43d1e57fb4446facde52071efb3a65ff0 /drivers/scsi/sd.c
parent16f2319fd67b169c0b34391d3fa0870fff129891 (diff)
downloadlinux-e96f6abe02fc3320d669985443e8c68ff8e83294.tar.xz
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>
Diffstat (limited to 'drivers/scsi/sd.c')
-rw-r--r--drivers/scsi/sd.c2
1 files changed, 0 insertions, 2 deletions
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;