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| author | Jens Axboe <jens.axboe@oracle.com> | 2008-09-14 05:55:09 -0700 |
|---|---|---|
| committer | Jens Axboe <jens.axboe@oracle.com> | 2008-10-09 08:56:13 +0200 |
| commit | 242f9dcb8ba6f68fcd217a119a7648a4f69290e9 (patch) | |
| tree | 1bfe245ffbc50d204d76665cd8f90d85100f86a1 /drivers/scsi/scsi_lib.c | |
| parent | 608aeef17a91747d6303de4df5e2c2e6899a95e8 (diff) | |
| download | lwn-242f9dcb8ba6f68fcd217a119a7648a4f69290e9.tar.gz lwn-242f9dcb8ba6f68fcd217a119a7648a4f69290e9.zip | |
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 <andmike@linux.vnet.ibm.com>
Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
Diffstat (limited to 'drivers/scsi/scsi_lib.c')
| -rw-r--r-- | drivers/scsi/scsi_lib.c | 17 |
1 files changed, 13 insertions, 4 deletions
diff --git a/drivers/scsi/scsi_lib.c b/drivers/scsi/scsi_lib.c index 62307bd794a9..e7686500e9dd 100644 --- a/drivers/scsi/scsi_lib.c +++ b/drivers/scsi/scsi_lib.c @@ -1181,7 +1181,6 @@ int scsi_setup_blk_pc_cmnd(struct scsi_device *sdev, struct request *req) cmd->transfersize = req->data_len; cmd->allowed = req->retries; - cmd->timeout_per_command = req->timeout; return BLKPREP_OK; } EXPORT_SYMBOL(scsi_setup_blk_pc_cmnd); @@ -1416,17 +1415,26 @@ static void scsi_kill_request(struct request *req, struct request_queue *q) spin_unlock(shost->host_lock); spin_lock(sdev->request_queue->queue_lock); - __scsi_done(cmd); + blk_complete_request(req); } static void scsi_softirq_done(struct request *rq) { - struct scsi_cmnd *cmd = rq->completion_data; - unsigned long wait_for = (cmd->allowed + 1) * cmd->timeout_per_command; + struct scsi_cmnd *cmd = rq->special; + unsigned long wait_for = (cmd->allowed + 1) * rq->timeout; int disposition; INIT_LIST_HEAD(&cmd->eh_entry); + /* + * Set the serial numbers back to zero + */ + cmd->serial_number = 0; + + atomic_inc(&cmd->device->iodone_cnt); + if (cmd->result) + atomic_inc(&cmd->device->ioerr_cnt); + disposition = scsi_decide_disposition(cmd); if (disposition != SUCCESS && time_before(cmd->jiffies_at_alloc + wait_for, jiffies)) { @@ -1675,6 +1683,7 @@ struct request_queue *scsi_alloc_queue(struct scsi_device *sdev) blk_queue_prep_rq(q, scsi_prep_fn); blk_queue_softirq_done(q, scsi_softirq_done); + blk_queue_rq_timed_out(q, scsi_times_out); return q; } |