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[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>
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@ -830,7 +830,7 @@ static int sd_setup_write_same_cmnd(struct scsi_device *sdp, struct request *rq)
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static int scsi_setup_flush_cmnd(struct scsi_device *sdp, struct request *rq)
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{
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rq->timeout = SD_FLUSH_TIMEOUT;
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rq->timeout *= SD_FLUSH_TIMEOUT_MULTIPLIER;
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rq->retries = SD_MAX_RETRIES;
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rq->cmd[0] = SYNCHRONIZE_CACHE;
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rq->cmd_len = 10;
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@ -1434,6 +1434,8 @@ static int sd_sync_cache(struct scsi_disk *sdkp)
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{
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int retries, res;
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struct scsi_device *sdp = sdkp->device;
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const int timeout = sdp->request_queue->rq_timeout
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* SD_FLUSH_TIMEOUT_MULTIPLIER;
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struct scsi_sense_hdr sshdr;
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if (!scsi_device_online(sdp))
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@ -1448,8 +1450,8 @@ static int sd_sync_cache(struct scsi_disk *sdkp)
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* flush everything.
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*/
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res = scsi_execute_req_flags(sdp, cmd, DMA_NONE, NULL, 0,
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&sshdr, SD_FLUSH_TIMEOUT,
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SD_MAX_RETRIES, NULL, REQ_PM);
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&sshdr, timeout, SD_MAX_RETRIES,
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NULL, REQ_PM);
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if (res == 0)
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break;
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}
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@ -13,7 +13,11 @@
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*/
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#define SD_TIMEOUT (30 * HZ)
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#define SD_MOD_TIMEOUT (75 * HZ)
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#define SD_FLUSH_TIMEOUT (60 * HZ)
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/*
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* Flush timeout is a multiplier over the standard device timeout which is
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* user modifiable via sysfs but initially set to SD_TIMEOUT
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*/
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#define SD_FLUSH_TIMEOUT_MULTIPLIER 2
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#define SD_WRITE_SAME_TIMEOUT (120 * HZ)
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/*
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