From 242f9dcb8ba6f68fcd217a119a7648a4f69290e9 Mon Sep 17 00:00:00 2001 From: Jens Axboe Date: Sun, 14 Sep 2008 05:55:09 -0700 Subject: block: unify request timeout handling Right now SCSI and others do their own command timeout handling. Move those bits to the block layer. Instead of having a timer per command, we try to be a bit more clever and simply have one per-queue. This avoids the overhead of having to tear down and setup a timer for each command, so it will result in a lot less timer fiddling. Signed-off-by: Mike Anderson Signed-off-by: Jens Axboe --- drivers/scsi/scsi_error.c | 90 +++++++---------------------------------------- 1 file changed, 13 insertions(+), 77 deletions(-) (limited to 'drivers/scsi/scsi_error.c') diff --git a/drivers/scsi/scsi_error.c b/drivers/scsi/scsi_error.c index 39ce3aba1dac..fecefa05cb62 100644 --- a/drivers/scsi/scsi_error.c +++ b/drivers/scsi/scsi_error.c @@ -111,70 +111,9 @@ int scsi_eh_scmd_add(struct scsi_cmnd *scmd, int eh_flag) return ret; } -/** - * scsi_add_timer - Start timeout timer for a single scsi command. - * @scmd: scsi command that is about to start running. - * @timeout: amount of time to allow this command to run. - * @complete: timeout function to call if timer isn't canceled. - * - * Notes: - * This should be turned into an inline function. Each scsi command - * has its own timer, and as it is added to the queue, we set up the - * timer. When the command completes, we cancel the timer. - */ -void scsi_add_timer(struct scsi_cmnd *scmd, int timeout, - void (*complete)(struct scsi_cmnd *)) -{ - - /* - * If the clock was already running for this command, then - * first delete the timer. The timer handling code gets rather - * confused if we don't do this. - */ - if (scmd->eh_timeout.function) - del_timer(&scmd->eh_timeout); - - scmd->eh_timeout.data = (unsigned long)scmd; - scmd->eh_timeout.expires = jiffies + timeout; - scmd->eh_timeout.function = (void (*)(unsigned long)) complete; - - SCSI_LOG_ERROR_RECOVERY(5, printk("%s: scmd: %p, time:" - " %d, (%p)\n", __func__, - scmd, timeout, complete)); - - add_timer(&scmd->eh_timeout); -} - -/** - * scsi_delete_timer - Delete/cancel timer for a given function. - * @scmd: Cmd that we are canceling timer for - * - * Notes: - * This should be turned into an inline function. - * - * Return value: - * 1 if we were able to detach the timer. 0 if we blew it, and the - * timer function has already started to run. - */ -int scsi_delete_timer(struct scsi_cmnd *scmd) -{ - int rtn; - - rtn = del_timer(&scmd->eh_timeout); - - SCSI_LOG_ERROR_RECOVERY(5, printk("%s: scmd: %p," - " rtn: %d\n", __func__, - scmd, rtn)); - - scmd->eh_timeout.data = (unsigned long)NULL; - scmd->eh_timeout.function = NULL; - - return rtn; -} - /** * scsi_times_out - Timeout function for normal scsi commands. - * @scmd: Cmd that is timing out. + * @req: request that is timing out. * * Notes: * We do not need to lock this. There is the potential for a race @@ -182,9 +121,11 @@ int scsi_delete_timer(struct scsi_cmnd *scmd) * normal completion function determines that the timer has already * fired, then it mustn't do anything. */ -void scsi_times_out(struct scsi_cmnd *scmd) +enum blk_eh_timer_return scsi_times_out(struct request *req) { - enum scsi_eh_timer_return (* eh_timed_out)(struct scsi_cmnd *); + struct scsi_cmnd *scmd = req->special; + enum blk_eh_timer_return (*eh_timed_out)(struct scsi_cmnd *); + enum blk_eh_timer_return rtn = BLK_EH_NOT_HANDLED; scsi_log_completion(scmd, TIMEOUT_ERROR); @@ -196,22 +137,20 @@ void scsi_times_out(struct scsi_cmnd *scmd) eh_timed_out = NULL; if (eh_timed_out) - switch (eh_timed_out(scmd)) { - case EH_HANDLED: - __scsi_done(scmd); - return; - case EH_RESET_TIMER: - scsi_add_timer(scmd, scmd->timeout_per_command, - scsi_times_out); - return; - case EH_NOT_HANDLED: + rtn = eh_timed_out(scmd); + switch (rtn) { + case BLK_EH_NOT_HANDLED: break; + default: + return rtn; } if (unlikely(!scsi_eh_scmd_add(scmd, SCSI_EH_CANCEL_CMD))) { scmd->result |= DID_TIME_OUT << 16; - __scsi_done(scmd); + return BLK_EH_HANDLED; } + + return BLK_EH_NOT_HANDLED; } /** @@ -1793,7 +1732,6 @@ scsi_reset_provider(struct scsi_device *dev, int flag) blk_rq_init(NULL, &req); scmd->request = &req; - memset(&scmd->eh_timeout, 0, sizeof(scmd->eh_timeout)); scmd->cmnd = req.cmd; @@ -1804,8 +1742,6 @@ scsi_reset_provider(struct scsi_device *dev, int flag) scmd->sc_data_direction = DMA_BIDIRECTIONAL; - init_timer(&scmd->eh_timeout); - spin_lock_irqsave(shost->host_lock, flags); shost->tmf_in_progress = 1; spin_unlock_irqrestore(shost->host_lock, flags); -- cgit v1.2.3