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block: unify request timeout handling

Browse source 
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 <[email protected]>
Signed-off-by: Jens Axboe <[email protected]>
This commit is contained in:
Jens Axboe 2008-09-14 05:55:09 -07:00
commit 242f9dcb8b
39 changed files with 399 additions and 339 deletions
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13
drivers/ata/libata-eh.c
View file

@ -33,6 +33,7 @@
*/
#include <linux/kernel.h>
#include <linux/blkdev.h>
#include <linux/pci.h>
#include <scsi/scsi.h>
#include <scsi/scsi_host.h>
@ -457,29 +458,29 @@ static void ata_eh_clear_action(struct ata_link *link, struct ata_device *dev,
* RETURNS:
* EH_HANDLED or EH_NOT_HANDLED
*/
enum scsi_eh_timer_return ata_scsi_timed_out(struct scsi_cmnd *cmd)
enum blk_eh_timer_return ata_scsi_timed_out(struct scsi_cmnd *cmd)
{
struct Scsi_Host *host = cmd->device->host;
struct ata_port *ap = ata_shost_to_port(host);
unsigned long flags;
struct ata_queued_cmd *qc;
enum scsi_eh_timer_return ret;
enum blk_eh_timer_return ret;
DPRINTK("ENTER\n");
if (ap->ops->error_handler) {
ret = EH_NOT_HANDLED;
ret = BLK_EH_NOT_HANDLED;
goto out;
}
ret = EH_HANDLED;
ret = BLK_EH_HANDLED;
spin_lock_irqsave(ap->lock, flags);
qc = ata_qc_from_tag(ap, ap->link.active_tag);
if (qc) {
WARN_ON(qc->scsicmd != cmd);
qc->flags |= ATA_QCFLAG_EH_SCHEDULED;
qc->err_mask |= AC_ERR_TIMEOUT;
ret = EH_NOT_HANDLED;
ret = BLK_EH_NOT_HANDLED;
}
spin_unlock_irqrestore(ap->lock, flags);
@ -831,7 +832,7 @@ void ata_qc_schedule_eh(struct ata_queued_cmd *qc)
* Note that ATA_QCFLAG_FAILED is unconditionally set after
* this function completes.
*/
scsi_req_abort_cmd(qc->scsicmd);
blk_abort_request(qc->scsicmd->request);
}
/**

2
drivers/ata/libata.h
View file

@ -152,7 +152,7 @@ extern int ata_bus_probe(struct ata_port *ap);
/* libata-eh.c */
extern unsigned long ata_internal_cmd_timeout(struct ata_device *dev, u8 cmd);
extern void ata_internal_cmd_timed_out(struct ata_device *dev, u8 cmd);
extern enum scsi_eh_timer_return ata_scsi_timed_out(struct scsi_cmnd *cmd);
extern enum blk_eh_timer_return ata_scsi_timed_out(struct scsi_cmnd *cmd);
extern void ata_scsi_error(struct Scsi_Host *host);
extern void ata_port_wait_eh(struct ata_port *ap);
extern void ata_eh_fastdrain_timerfn(unsigned long arg);