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| author | James Bottomley <jbottomley@parallels.com> | 2013-10-04 21:42:24 +0000 |
|---|---|---|
| committer | James Bottomley <JBottomley@Parallels.com> | 2013-10-25 09:58:16 +0100 |
| commit | 7e660100d85af860e7ad763202fff717adcdaacd (patch) | |
| tree | 851008ff72523b38313ddc4609001904e7d400d9 /drivers/scsi | |
| parent | d078b5117f18dce57b895df640d9bf2614864829 (diff) | |
| download | linux-7e660100d85af860e7ad763202fff717adcdaacd.tar.gz linux-7e660100d85af860e7ad763202fff717adcdaacd.tar.bz2 linux-7e660100d85af860e7ad763202fff717adcdaacd.zip | |
[SCSI] Derive the FLUSH_TIMEOUT from the basic I/O timeout
Rather than having a separate constant for specifying the timeout on FLUSH
operations, use the basic I/O timeout value that is already configurable
on a per target basis to derive the FLUSH timeout. Looking at the current
definitions of these timeout values, the FLUSH operation is supposed to have
a value that is twice the normal timeout value. This patch preserves this
relationship while leveraging the flexibility of specifying the I/O timeout.
Based on a prior patch by KY Srinivasan <kys@microsoft.com>
Reviewed-by: KY Srinivasan <kys@microsoft.com>
Signed-off-by: James Bottomley <JBottomley@Parallels.com>
Diffstat (limited to 'drivers/scsi')
| -rw-r--r-- | drivers/scsi/sd.c | 8 | ||||
| -rw-r--r-- | drivers/scsi/sd.h | 6 |
2 files changed, 10 insertions, 4 deletions
diff --git a/drivers/scsi/sd.c b/drivers/scsi/sd.c index 3824e754ca1d..fd874b846dc1 100644 --- a/drivers/scsi/sd.c +++ b/drivers/scsi/sd.c @@ -830,7 +830,7 @@ static int sd_setup_write_same_cmnd(struct scsi_device *sdp, struct request *rq) static int scsi_setup_flush_cmnd(struct scsi_device *sdp, struct request *rq) { - rq->timeout = SD_FLUSH_TIMEOUT; + rq->timeout *= SD_FLUSH_TIMEOUT_MULTIPLIER; rq->retries = SD_MAX_RETRIES; rq->cmd[0] = SYNCHRONIZE_CACHE; rq->cmd_len = 10; @@ -1434,6 +1434,8 @@ static int sd_sync_cache(struct scsi_disk *sdkp) { int retries, res; struct scsi_device *sdp = sdkp->device; + const int timeout = sdp->request_queue->rq_timeout + * SD_FLUSH_TIMEOUT_MULTIPLIER; struct scsi_sense_hdr sshdr; if (!scsi_device_online(sdp)) @@ -1448,8 +1450,8 @@ static int sd_sync_cache(struct scsi_disk *sdkp) * flush everything. */ res = scsi_execute_req_flags(sdp, cmd, DMA_NONE, NULL, 0, - &sshdr, SD_FLUSH_TIMEOUT, - SD_MAX_RETRIES, NULL, REQ_PM); + &sshdr, timeout, SD_MAX_RETRIES, + NULL, REQ_PM); if (res == 0) break; } diff --git a/drivers/scsi/sd.h b/drivers/scsi/sd.h index 7a049de22051..26895ff247c5 100644 --- a/drivers/scsi/sd.h +++ b/drivers/scsi/sd.h @@ -13,7 +13,11 @@ */ #define SD_TIMEOUT (30 * HZ) #define SD_MOD_TIMEOUT (75 * HZ) -#define SD_FLUSH_TIMEOUT (60 * HZ) +/* + * Flush timeout is a multiplier over the standard device timeout which is + * user modifiable via sysfs but initially set to SD_TIMEOUT + */ +#define SD_FLUSH_TIMEOUT_MULTIPLIER 2 #define SD_WRITE_SAME_TIMEOUT (120 * HZ) /* |