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Ming Lei 3a762de55b block: save irq state in blkg_lookup_create() 
blkg_lookup_create() may be called from pool_map() in which
irq state is saved, so we have to do that in blkg_lookup_create().

Otherwise, the following lockdep warning can be triggered:

[  104.258537] ================================
[  104.259129] WARNING: inconsistent lock state
[  104.259725] 4.20.0-rc6+ #545 Not tainted
[  104.260268] --------------------------------
[  104.260865] inconsistent {SOFTIRQ-ON-W} -> {IN-SOFTIRQ-W} usage.
[  104.261727] swapper/49/0 [HC0[0]:SC1[1]:HE0:SE0] takes:
[  104.262444] 00000000db365b5d (&(&pool->lock)->rlock#3){+.?.}, at: thin_endio+0xcf/0x2a3 [dm_thin_pool]
[  104.263747] {SOFTIRQ-ON-W} state was registered at:
[  104.264417]   _raw_spin_unlock_irq+0x29/0x4c
[  104.265014]   blkg_lookup_create+0xdc/0xe6
[  104.265609]   bio_associate_blkg_from_css+0xd3/0x13f
[  104.266312]   bio_associate_blkg+0x15a/0x1bb
[  104.266913]   pool_map+0xe8/0x103 [dm_thin_pool]
[  104.267572]   __map_bio+0x98/0x29c [dm_mod]
[  104.268162]   __split_and_process_non_flush+0x29e/0x306 [dm_mod]
[  104.269003]   __split_and_process_bio+0x16a/0x25b [dm_mod]
[  104.269971]   __dm_make_request.isra.14+0xdc/0x124 [dm_mod]
[  104.270973]   generic_make_request+0x3f5/0x68b
[  104.271676]   process_prepared_mapping+0x166/0x1ef [dm_thin_pool]
[  104.272531]   schedule_zero+0x239/0x273 [dm_thin_pool]
[  104.273245]   process_cell+0x60c/0x6f1 [dm_thin_pool]
[  104.273967]   do_worker+0x60c/0xca8 [dm_thin_pool]
[  104.274635]   process_one_work+0x4eb/0x834
[  104.275203]   worker_thread+0x318/0x484
[  104.275740]   kthread+0x1d1/0x1e1
[  104.276203]   ret_from_fork+0x3a/0x50
[  104.276714] irq event stamp: 170003
[  104.277201] hardirqs last  enabled at (170002): [<ffffffff81bcc33e>] _raw_spin_unlock_irqrestore+0x44/0x6b
[  104.278535] hardirqs last disabled at (170003): [<ffffffff81bcc1ad>] _raw_spin_lock_irqsave+0x20/0x55
[  104.280273] softirqs last  enabled at (169978): [<ffffffff810d13d4>] irq_enter+0x4c/0x73
[  104.281617] softirqs last disabled at (169979): [<ffffffff810d1479>] irq_exit+0x7e/0x11d
[  104.282744]
[  104.282744] other info that might help us debug this:
[  104.283640]  Possible unsafe locking scenario:
[  104.283640]
[  104.284452]        CPU0
[  104.284803]        ----
[  104.285150]   lock(&(&pool->lock)->rlock#3);
[  104.285762]   <Interrupt>
[  104.286130]     lock(&(&pool->lock)->rlock#3);
[  104.286750]
[  104.286750]  *** DEADLOCK ***
[  104.286750]
[  104.287564] no locks held by swapper/49/0.
[  104.288129]
[  104.288129] stack backtrace:
[  104.288738] CPU: 49 PID: 0 Comm: swapper/49 Not tainted 4.20.0-rc6+ #545
[  104.289700] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.10.2-2.fc27 04/01/2014
[  104.290858] Call Trace:
[  104.291204]  <IRQ>
[  104.291502]  dump_stack+0x9a/0xe6
[  104.291968]  mark_lock+0x56c/0x7a6
[  104.292442]  ? check_usage_backwards+0x209/0x209
[  104.293086]  __lock_acquire+0x400/0x15bf
[  104.293662]  ? check_chain_key+0x150/0x1aa
[  104.294236]  lock_acquire+0x1a6/0x1e3
[  104.294768]  ? thin_endio+0xcf/0x2a3 [dm_thin_pool]
[  104.295444]  ? _raw_spin_unlock_irqrestore+0x44/0x6b
[  104.296143]  ? process_prepared_discard_fail+0x36/0x36 [dm_thin_pool]
[  104.297031]  _raw_spin_lock_irqsave+0x46/0x55
[  104.297659]  ? thin_endio+0xcf/0x2a3 [dm_thin_pool]
[  104.298335]  thin_endio+0xcf/0x2a3 [dm_thin_pool]
[  104.298997]  ? process_prepared_discard_fail+0x36/0x36 [dm_thin_pool]
[  104.299886]  ? check_flags+0x20a/0x20a
[  104.300408]  ? lock_acquire+0x1a6/0x1e3
[  104.300954]  ? process_prepared_discard_fail+0x36/0x36 [dm_thin_pool]
[  104.301865]  clone_endio+0x1bb/0x22d [dm_mod]
[  104.302491]  ? disable_write_zeroes+0x20/0x20 [dm_mod]
[  104.303200]  ? bio_disassociate_blkg+0xc6/0x15f
[  104.303836]  ? bio_endio+0x2b2/0x2da
[  104.304349]  clone_endio+0x1f3/0x22d [dm_mod]
[  104.304978]  ? disable_write_zeroes+0x20/0x20 [dm_mod]
[  104.305709]  ? bio_disassociate_blkg+0xc6/0x15f
[  104.306333]  ? bio_endio+0x2b2/0x2da
[  104.306853]  clone_endio+0x1f3/0x22d [dm_mod]
[  104.307476]  ? disable_write_zeroes+0x20/0x20 [dm_mod]
[  104.308185]  ? bio_disassociate_blkg+0xc6/0x15f
[  104.308817]  ? bio_endio+0x2b2/0x2da
[  104.309319]  blk_update_request+0x2de/0x4cc
[  104.309927]  blk_mq_end_request+0x2a/0x183
[  104.310498]  blk_done_softirq+0x16a/0x1a6
[  104.311051]  ? blk_softirq_cpu_dead+0xe2/0xe2
[  104.311653]  ? __lock_is_held+0x2a/0x87
[  104.312186]  __do_softirq+0x250/0x4e8
[  104.312705]  irq_exit+0x7e/0x11d
[  104.313157]  call_function_single_interrupt+0xf/0x20
[  104.313860]  </IRQ>
[  104.314163] RIP: 0010:native_safe_halt+0x2/0x3
[  104.314792] Code: 63 02 df f0 83 44 24 fc 00 48 89 df e8 cc 3f 7a ff 48 8b 03 a8 08 74 0b 65 81 25 9d 31 45 7e ff ff ff 7f 5b 5d 41 5c c3 fb f4 <c3> f4 c3 0f 1f 44 00 00 41 56 41 55 41 54 55 53 e8 a2 0d 5c ff e8
[  104.317339] RSP: 0018:ffff888106c9fdc0 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff04
[  104.318390] RAX: 1ffff11020d92100 RBX: 0000000000000000 RCX: ffffffff81159ac7
[  104.319366] RDX: 1ffffffff05d5e69 RSI: 0000000000000007 RDI: ffff888106c90d1c
[  104.320339] RBP: 0000000000000000 R08: dffffc0000000000 R09: 0000000000000001
[  104.321313] R10: ffffed1025d57ba0 R11: ffffed1025d57b9f R12: 1ffff11020d93fbf
[  104.322328] R13: 0000000000000031 R14: ffff888106c90040 R15: 0000000000000000
[  104.323307]  ? lockdep_hardirqs_on+0x26b/0x278
[  104.323927]  default_idle+0xd9/0x1a8
[  104.324427]  do_idle+0x162/0x2b2
[  104.324891]  ? arch_cpu_idle_exit+0x28/0x28
[  104.325467]  ? mark_held_locks+0x28/0x7f
[  104.326031]  ? _raw_spin_unlock_irqrestore+0x44/0x6b
[  104.326719]  cpu_startup_entry+0x1d/0x1f
[  104.327261]  start_secondary+0x2cb/0x308
[  104.327806]  ? set_cpu_sibling_map+0x8a3/0x8a3
[  104.328421]  secondary_startup_64+0xa4/0xb0

Fixes: b978962ad4 ("blkcg: update blkg_lookup_create() to do locking")
Cc: Mike Snitzer <snitzer@redhat.com>
Cc: Dennis Zhou <dennis@kernel.org>
Signed-off-by: Ming Lei <ming.lei@redhat.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
2018-12-19 09:35:45 -07:00
..
partitions partitions/aix: append null character to print data from disk 2018-07-27 09:17:41 -06:00
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 blkcg: fix ref count issue with bio_blkcg() using task_css 2018-12-07 22:26:36 -07:00
bfq-iosched.c Linux 4.20-rc6 2018-12-09 17:45:40 -07:00
bfq-iosched.h block, bfq: fix decrement of num_active_groups 2018-12-07 07:40:07 -07:00
bfq-wf2q.c block, bfq: fix decrement of num_active_groups 2018-12-07 07:40:07 -07:00
bio-integrity.c block: remove the bio_integrity_advance export 2018-12-16 08:33:57 -07:00
bio.c block: remove the unused bio_set_pages_dirty and bio_check_pages_dirty exports 2018-12-14 06:17:58 -07:00
blk-cgroup.c block: save irq state in blkg_lookup_create() 2018-12-19 09:35:45 -07:00
blk-core.c block: clear REQ_HIPRI if polling is not supported 2018-12-16 09:01:38 -07:00
blk-exec.c block: remove dead elevator code 2018-11-07 13:42:32 -07:00
blk-flush.c block: add queue_is_mq() helper 2018-11-16 08:34:06 -07:00
blk-integrity.c block: merge BIOVEC_SEG_BOUNDARY into biovec_phys_mergeable 2018-09-24 12:33:57 -06:00
blk-ioc.c block: remove the queue_lock indirection 2018-11-15 12:17:28 -07:00
blk-iolatency.c block: fix blk-iolatency accounting underflow 2018-12-17 11:19:54 -07:00
blk-lib.c block: fix 32 bit overflow in __blkdev_issue_discard() 2018-11-14 08:17:18 -07:00
blk-map.c Merge branch 'for-4.16/block' of git://git.kernel.dk/linux-block 2018-01-29 11:51:49 -08:00
blk-merge.c block: remove the blk_recount_segments export 2018-12-14 06:17:55 -07:00
blk-mq-cpumap.c blk-mq: initial support for multiple queue maps 2018-11-07 13:45:00 -07:00
blk-mq-debugfs-zoned.c block: Make struct request_queue smaller for CONFIG_BLK_DEV_ZONED=n 2018-07-09 09:07:52 -06:00
blk-mq-debugfs.c blk-mq: fix dispatch from sw queue 2018-12-17 11:19:54 -07:00
blk-mq-debugfs.h blk-mq-debugfs: support rq_qos 2018-12-16 19:53:47 -07:00
blk-mq-pci.c blk-mq: initial support for multiple queue maps 2018-11-07 13:45:00 -07:00
blk-mq-rdma.c blk-mq-rdma: pass in queue map to blk_mq_rdma_map_queues 2018-12-13 09:59:08 +01:00
blk-mq-sched.c blk-mq: fix dispatch from sw queue 2018-12-17 11:19:54 -07:00
blk-mq-sched.h block: mq-deadline: Fix write completion handling 2018-12-17 11:19:39 -07:00
blk-mq-sysfs.c blk-mq: export hctx->type in debugfs instead of sysfs 2018-12-17 05:44:45 -07:00
blk-mq-tag.c sbitmap: optimize wakeup check 2018-11-30 14:48:04 -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: initial support for multiple queue maps 2018-11-07 13:45:00 -07:00
blk-mq.c block: make request_to_qc_t public 2018-12-18 17:50:47 +01:00
blk-mq.h blk-mq: fix dispatch from sw queue 2018-12-17 11:19:54 -07:00
blk-pm.c block: remove the queue_lock indirection 2018-11-15 12:17:28 -07:00
blk-pm.h block: remove the queue_lock indirection 2018-11-15 12:17:28 -07:00
blk-rq-qos.c blk-mq-debugfs: support rq_qos 2018-12-16 19:53:47 -07:00
blk-rq-qos.h block: fix blk-iolatency accounting underflow 2018-12-17 11:19:54 -07:00
blk-settings.c block: use atomic bitops for ->queue_flags 2018-11-15 12:13:19 -07:00
blk-softirq.c block: remove a few unused exports 2018-11-15 12:13:25 -07:00
blk-stat.c block: remove a few unused exports 2018-11-15 12:13:25 -07:00
blk-stat.h block: deactivate blk_stat timer in wbt_disable_default() 2018-12-12 06:47:51 -07:00
blk-sysfs.c blk-mq: enable IO poll if .nr_queues of type poll > 0 2018-12-17 21:35:07 -07:00
blk-throttle.c blkcg: consolidate bio_issue_init() to be a part of core 2018-12-07 22:26:37 -07:00
blk-timeout.c block: don't hold the queue_lock over blk_abort_request 2018-11-15 12:13:18 -07:00
blk-wbt.c blk-wbt: export internal state via debugfs 2018-12-16 19:53:49 -07:00
blk-wbt.h block: remove external dependency on wbt_flags 2018-07-09 09:07:54 -06:00
blk-zoned.c block: add queue_is_mq() helper 2018-11-16 08:34:06 -07:00
blk.h block: sum requests in the plug structure 2018-11-26 10:35:22 -07:00
bounce.c blkcg: remove bio->bi_css and instead use bio->bi_blkg 2018-12-07 22:26:37 -07:00
bsg-lib.c bsg: move bsg-lib parts outside of request queue 2018-11-07 13:42:33 -07:00
bsg.c block: add queue_is_mq() helper 2018-11-16 08:34:06 -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
elevator.c block: add queue_is_mq() helper 2018-11-16 08:34:06 -07:00
genhd.c block: return just one value from part_in_flight 2018-12-10 08:30:38 -07:00
ioctl.c block: Introduce BLKGETNRZONES ioctl 2018-10-25 11:17:40 -06:00
ioprio.c block: add ioprio_check_cap function 2018-05-31 10:50:54 -04:00
Kconfig blk-wbt: kill check for legacy queue type 2018-11-07 13:42:32 -07:00
Kconfig.iosched block: remove legacy IO schedulers 2018-11-07 13:42:32 -07:00
kyber-iosched.c blk-mq: allow software queue to map to multiple hardware queues 2018-11-07 13:44:59 -07:00
Makefile block: remove legacy IO schedulers 2018-11-07 13:42:32 -07:00
mq-deadline.c block: mq-deadline: Fix write completion handling 2018-12-17 11:19:39 -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 block: return just one value from part_in_flight 2018-12-10 08:30:38 -07:00
scsi_ioctl.c block: consistently use GFP_NOIO instead of __GFP_NORECLAIM 2018-05-14 08:55:18 -06:00
sed-opal.c block: sed-opal: Fix a couple off by one bugs 2018-06-20 12:04:06 -06:00
t10-pi.c block: move dif_prepare/dif_complete functions to block layer 2018-07-30 08:27:02 -06:00