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block: unify request timeout handling

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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 <andmike@linux.vnet.ibm.com>
Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
This commit is contained in:
Jens Axboe
2008-09-14 05:55:09 -07:00
parent 608aeef17a
commit 242f9dcb8b
39 changed files with 399 additions and 339 deletions
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9
include/scsi/scsi_host.h
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@@ -43,13 +43,6 @@ struct blk_queue_tags;
#define DISABLE_CLUSTERING 0
#define ENABLE_CLUSTERING 1
enum scsi_eh_timer_return {
EH_NOT_HANDLED,
EH_HANDLED,
EH_RESET_TIMER,
};
struct scsi_host_template {
struct module *module;
const char *name;
@@ -347,7 +340,7 @@ struct scsi_host_template {
*
* Status: OPTIONAL
*/
enum scsi_eh_timer_return (* eh_timed_out)(struct scsi_cmnd *);
enum blk_eh_timer_return (*eh_timed_out)(struct scsi_cmnd *);
/*
* Name of proc directory