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Tejun Heo 358f70da49 blk-mq: make blk_abort_request() trigger timeout path 
With issue/complete and timeout paths now using the generation number
and state based synchronization, blk_abort_request() is the only one
which depends on REQ_ATOM_COMPLETE for arbitrating completion.

There's no reason for blk_abort_request() to be a completely separate
path.  This patch makes blk_abort_request() piggyback on the timeout
path instead of trying to terminate the request directly.

This removes the last dependency on REQ_ATOM_COMPLETE in blk-mq.

Note that this makes blk_abort_request() asynchronous - it initiates
abortion but the actual termination will happen after a short while,
even when the caller owns the request.  AFAICS, SCSI and ATA should be
fine with that and I think mtip32xx and dasd should be safe but not
completely sure.  It'd be great if people who know the drivers take a
look.

v2: - Add comment explaining the lack of synchronization around
      ->deadline update as requested by Bart.

Signed-off-by: Tejun Heo <tj@kernel.org>
Cc: Asai Thambi SP <asamymuthupa@micron.com>
Cc: Stefan Haberland <sth@linux.vnet.ibm.com>
Cc: Jan Hoeppner <hoeppner@linux.vnet.ibm.com>
Cc: Bart Van Assche <Bart.VanAssche@wdc.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
 		2018-01-09 09:31:15 -07:00
..
partitions License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
Kconfig License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
Kconfig.iosched License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
Makefile License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
badblocks.c badblocks: fix wrong return value in badblocks_set if badblocks are disabled 2017-11-03 11:29:50 -07:00
bfq-cgroup.c block, bfq: put async queues for root bfq groups too 2018-01-09 08:45:25 -07:00
bfq-iosched.c block, bfq: release oom-queue ref to root group on exit 2018-01-09 08:45:25 -07:00
bfq-iosched.h block, bfq: let a queue be merged only shortly after starting I/O 2018-01-05 09:26:09 -07:00
bfq-wf2q.c block, bfq: let a queue be merged only shortly after starting I/O 2018-01-05 09:26:09 -07:00
bio-integrity.c block: remove unnecessary NULL checks in bioset_integrity_free() 2017-10-06 13:03:12 -06:00
bio.c block: move bio_alloc_pages() to bcache 2018-01-06 09:18:00 -07:00
blk-cgroup.c blkcg: add sanity check for blkcg policy operations 2017-11-04 12:31:15 -06:00
blk-core.c blk-mq: replace timeout synchronization with a RCU and generation based scheme 2018-01-09 09:31:15 -07:00
blk-exec.c block: introduce new block status code type 2017-06-09 09:27:32 -06:00
blk-flush.c blk-mq: don't allocate driver tag upfront for flush rq 2017-11-04 12:40:13 -06:00
blk-integrity.c block: switch bios to blk_status_t 2017-06-09 09:27:32 -06:00
blk-ioc.c License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
blk-lib.c Merge branch 'for-4.15/block' of git://git.kernel.dk/linux-block 2017-11-14 15:32:19 -08:00
blk-map.c Merge branch 'work.iov_iter' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs 2017-11-17 12:08:18 -08:00
blk-merge.c block: blk-merge: remove unnecessary check 2018-01-06 09:18:00 -07:00
blk-mq-cpumap.c blk-mq: map queues to all present CPUs 2017-07-24 10:01:31 -06:00
blk-mq-debugfs.c Merge branch 'for-4.15/block' of git://git.kernel.dk/linux-block 2017-11-14 15:32:19 -08:00
blk-mq-debugfs.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
blk-mq-pci.c blk-mq-pci: add a fallback when pci_irq_get_affinity returns NULL 2017-08-18 08:08:14 -06:00
blk-mq-rdma.c block: Add rdma affinity based queue mapping helper 2017-08-08 14:58:03 -04:00
blk-mq-sched.c blk-mq: remove confusing comment of blk_mq_sched_dispatch_requests 2018-01-05 08:36:33 -07:00
blk-mq-sched.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
blk-mq-sysfs.c blk-mq: untangle debugfs and sysfs 2017-05-04 08:24:13 -06:00
blk-mq-tag.c blk-mq: improve heavily contended tag case 2017-12-22 11:09:37 -07:00
blk-mq-tag.h Merge branch 'for-4.15/block' of git://git.kernel.dk/linux-block 2017-11-14 15:32:19 -08:00
blk-mq-virtio.c blk-mq: provide a default queue mapping for virtio device 2017-02-27 20:54:05 +02:00
blk-mq.c blk-mq: make blk_abort_request() trigger timeout path 2018-01-09 09:31:15 -07:00
blk-mq.h blk-mq: make blk_abort_request() trigger timeout path 2018-01-09 09:31:15 -07:00
blk-settings.c block: remove __bio_kmap_atomic 2017-11-10 19:53:25 -07:00
blk-softirq.c License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
blk-stat.c treewide: setup_timer() -> timer_setup() 2017-11-21 15:57:07 -08:00
blk-stat.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
blk-sysfs.c blk-sysfs: remove NULL pointer checking in queue_wb_lat_store 2017-11-23 22:00:17 -07:00
blk-tag.c License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
blk-throttle.c treewide: setup_timer() -> timer_setup() 2017-11-21 15:57:07 -08:00
blk-timeout.c blk-mq: make blk_abort_request() trigger timeout path 2018-01-09 09:31:15 -07:00
blk-wbt.c blk-wbt: fix comments typo 2017-11-23 22:00:20 -07:00
blk-wbt.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
blk-zoned.c block: introduce zoned block devices zone write locking 2018-01-05 09:22:17 -07:00
blk.h blk-mq: replace timeout synchronization with a RCU and generation based scheme 2018-01-09 09:31:15 -07:00
bounce.c block: bounce: don't access bio->bi_io_vec in copy_to_high_bio_irq 2018-01-06 09:18:00 -07:00
bsg-lib.c bsg-lib: fix use-after-free under memory-pressure 2017-10-04 08:35:04 -06:00
bsg.c block: pass full fmode_t to blk_verify_command 2017-11-10 19:53:25 -07:00
cfq-iosched.c block/cfq: cache rightmost rb_node 2017-09-08 18:26:49 -07:00
cmdline-parser.c License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
compat_ioctl.c License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
deadline-iosched.c deadline-iosched: Introduce zone locking support 2018-01-05 09:22:17 -07:00
elevator.c blk-mq: quiesce queue during switching io sched and updating nr_requests 2018-01-06 09:25:36 -07:00
genhd.c block: genhd.c: fix message typo 2017-11-19 11:02:19 -07:00
ioctl.c block: move CAP_SYS_ADMIN check in blkdev_roset() 2017-10-25 12:25:00 -06:00
ioprio.c block: Add fallthrough markers to switch statements 2017-06-21 11:46:07 -06:00
kyber-iosched.c block: kyber: check if there are requests in ctx in kyber_has_work() 2017-11-01 08:20:02 -06:00
mq-deadline.c mq-deadline: make it clear that __dd_dispatch_request() works on all hw queues 2018-01-06 09:23:11 -07:00
noop-iosched.c block: move existing elevator ops to union 2017-01-17 10:03:33 -07:00
opal_proto.h block: sed-opal: Set MBRDone on S3 resume path if TPER is MBREnabled 2017-09-11 09:45:52 -06:00
partition-generic.c License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
scsi_ioctl.c block: pass full fmode_t to blk_verify_command 2017-11-10 19:53:25 -07:00
sed-opal.c block: sed-opal: Set MBRDone on S3 resume path if TPER is MBREnabled 2017-09-11 09:45:52 -06:00
t10-pi.c t10-pi: Move opencoded contants to common header 2017-07-03 16:56:25 -06:00