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authorLinus Torvalds <torvalds@linux-foundation.org>2014-10-18 22:53:51 +0400
committerLinus Torvalds <torvalds@linux-foundation.org>2014-10-18 22:53:51 +0400
commitd3dc366bbaf07c125561e90d6da4bb147741101a (patch)
tree6eb7e79a8ec9df1fa705393c6d15ccea3d104661 /drivers/scsi/scsi_lib.c
parent511c41d9e6665a07aca94eb00983cf6d77dd87ff (diff)
parente19a8a0ad2d255316830ead05b59c5a704434cbb (diff)
downloadlinux-d3dc366bbaf07c125561e90d6da4bb147741101a.tar.xz
Merge branch 'for-3.18/core' of git://git.kernel.dk/linux-block
Pull core block layer changes from Jens Axboe: "This is the core block IO pull request for 3.18. Apart from the new and improved flush machinery for blk-mq, this is all mostly bug fixes and cleanups. - blk-mq timeout updates and fixes from Christoph. - Removal of REQ_END, also from Christoph. We pass it through the ->queue_rq() hook for blk-mq instead, freeing up one of the request bits. The space was overly tight on 32-bit, so Martin also killed REQ_KERNEL since it's no longer used. - blk integrity updates and fixes from Martin and Gu Zheng. - Update to the flush machinery for blk-mq from Ming Lei. Now we have a per hardware context flush request, which both cleans up the code should scale better for flush intensive workloads on blk-mq. - Improve the error printing, from Rob Elliott. - Backing device improvements and cleanups from Tejun. - Fixup of a misplaced rq_complete() tracepoint from Hannes. - Make blk_get_request() return error pointers, fixing up issues where we NULL deref when a device goes bad or missing. From Joe Lawrence. - Prep work for drastically reducing the memory consumption of dm devices from Junichi Nomura. This allows creating clone bio sets without preallocating a lot of memory. - Fix a blk-mq hang on certain combinations of queue depths and hardware queues from me. - Limit memory consumption for blk-mq devices for crash dump scenarios and drivers that use crazy high depths (certain SCSI shared tag setups). We now just use a single queue and limited depth for that" * 'for-3.18/core' of git://git.kernel.dk/linux-block: (58 commits) block: Remove REQ_KERNEL blk-mq: allocate cpumask on the home node bio-integrity: remove the needless fail handle of bip_slab creating block: include func name in __get_request prints block: make blk_update_request print prefix match ratelimited prefix blk-merge: don't compute bi_phys_segments from bi_vcnt for cloned bio block: fix alignment_offset math that assumes io_min is a power-of-2 blk-mq: Make bt_clear_tag() easier to read blk-mq: fix potential hang if rolling wakeup depth is too high block: add bioset_create_nobvec() block: use bio_clone_fast() in blk_rq_prep_clone() block: misplaced rq_complete tracepoint sd: Honor block layer integrity handling flags block: Replace strnicmp with strncasecmp block: Add T10 Protection Information functions block: Don't merge requests if integrity flags differ block: Integrity checksum flag block: Relocate bio integrity flags block: Add a disk flag to block integrity profile block: Add prefix to block integrity profile flags ...
Diffstat (limited to 'drivers/scsi/scsi_lib.c')
-rw-r--r--drivers/scsi/scsi_lib.c24
1 files changed, 19 insertions, 5 deletions
diff --git a/drivers/scsi/scsi_lib.c b/drivers/scsi/scsi_lib.c
index db8c449282f9..9eff8a375132 100644
--- a/drivers/scsi/scsi_lib.c
+++ b/drivers/scsi/scsi_lib.c
@@ -221,7 +221,7 @@ int scsi_execute(struct scsi_device *sdev, const unsigned char *cmd,
int ret = DRIVER_ERROR << 24;
req = blk_get_request(sdev->request_queue, write, __GFP_WAIT);
- if (!req)
+ if (IS_ERR(req))
return ret;
blk_rq_set_block_pc(req);
@@ -715,7 +715,7 @@ static bool scsi_end_request(struct request *req, int error,
if (req->mq_ctx) {
/*
- * In the MQ case the command gets freed by __blk_mq_end_io,
+ * In the MQ case the command gets freed by __blk_mq_end_request,
* so we have to do all cleanup that depends on it earlier.
*
* We also can't kick the queues from irq context, so we
@@ -723,7 +723,7 @@ static bool scsi_end_request(struct request *req, int error,
*/
scsi_mq_uninit_cmd(cmd);
- __blk_mq_end_io(req, error);
+ __blk_mq_end_request(req, error);
if (scsi_target(sdev)->single_lun ||
!list_empty(&sdev->host->starved_list))
@@ -1847,6 +1847,8 @@ static int scsi_mq_prep_fn(struct request *req)
next_rq->special = bidi_sdb;
}
+ blk_mq_start_request(req);
+
return scsi_setup_cmnd(sdev, req);
}
@@ -1856,7 +1858,8 @@ static void scsi_mq_done(struct scsi_cmnd *cmd)
blk_mq_complete_request(cmd->request);
}
-static int scsi_queue_rq(struct blk_mq_hw_ctx *hctx, struct request *req)
+static int scsi_queue_rq(struct blk_mq_hw_ctx *hctx, struct request *req,
+ bool last)
{
struct request_queue *q = req->q;
struct scsi_device *sdev = q->queuedata;
@@ -1880,11 +1883,14 @@ static int scsi_queue_rq(struct blk_mq_hw_ctx *hctx, struct request *req)
if (!scsi_host_queue_ready(q, shost, sdev))
goto out_dec_target_busy;
+
if (!(req->cmd_flags & REQ_DONTPREP)) {
ret = prep_to_mq(scsi_mq_prep_fn(req));
if (ret)
goto out_dec_host_busy;
req->cmd_flags |= REQ_DONTPREP;
+ } else {
+ blk_mq_start_request(req);
}
scsi_init_cmd_errh(cmd);
@@ -1931,6 +1937,14 @@ out:
return ret;
}
+static enum blk_eh_timer_return scsi_timeout(struct request *req,
+ bool reserved)
+{
+ if (reserved)
+ return BLK_EH_RESET_TIMER;
+ return scsi_times_out(req);
+}
+
static int scsi_init_request(void *data, struct request *rq,
unsigned int hctx_idx, unsigned int request_idx,
unsigned int numa_node)
@@ -2042,7 +2056,7 @@ static struct blk_mq_ops scsi_mq_ops = {
.map_queue = blk_mq_map_queue,
.queue_rq = scsi_queue_rq,
.complete = scsi_softirq_done,
- .timeout = scsi_times_out,
+ .timeout = scsi_timeout,
.init_request = scsi_init_request,
.exit_request = scsi_exit_request,
};