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[SCSI] Derive the FLUSH_TIMEOUT from the basic I/O timeout

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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>
This commit is contained in:
James Bottomley 2013-10-04 21:42:24 +00:00 committed by James Bottomley
parent d078b5117f
commit 7e660100d8
2 changed files with 10 additions and 4 deletions
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8
drivers/scsi/sd.c
View file

@ -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;
}

6
drivers/scsi/sd.h
View file

@ -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)
/*