- 11 Aug, 2017 1 commit
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Wen Xiong authored
BugLink: http://bugs.launchpad.net/bugs/1689946 When formatting NVMe to 512B/4K + T10 DIf/DIX, dd with split op returns "Input/output error". Looks block layer split the bio after calling bio_integrity_prep(bio). This patch fixes the issue. Below is how we debug this issue: (1)format nvme to 4K block # size with type 2 DIF (2)dd with block size bigger than 1024k. oflag=direct dd: error writing '/dev/nvme0n1': Input/output error We added some debug code in nvme device driver. It showed us the first op and the second op have the same bi and pi address. This is not correct. 1st op: nvme0n1 Op:Wr slba 0x505 length 0x100, PI ctrl=0x1400, dsmgmt=0x0, AT=0x0 & RT=0x505 Guard 0x00b1, AT 0x0000, RT physical 0x00000505 RT virtual 0x00002828 2nd op: nvme0n1 Op:Wr slba 0x605 length 0x1, PI ctrl=0x1400, dsmgmt=0x0, AT=0x0 & RT=0x605 ==> This op fails and subsequent 5 retires.. Guard 0x00b1, AT 0x0000, RT physical 0x00000605 RT virtual 0x00002828 With the fix, It showed us both of the first op and the second op have correct bi and pi address. 1st op: nvme2n1 Op:Wr slba 0x505 length 0x100, PI ctrl=0x1400, dsmgmt=0x0, AT=0x0 & RT=0x505 Guard 0x5ccb, AT 0x0000, RT physical 0x00000505 RT virtual 0x00002828 2nd op: nvme2n1 Op:Wr slba 0x605 length 0x1, PI ctrl=0x1400, dsmgmt=0x0, AT=0x0 & RT=0x605 Guard 0xab4c, AT 0x0000, RT physical 0x00000605 RT virtual 0x00003028 Signed-off-by:
Wen Xiong <wenxiong@linux.vnet.ibm.com> Signed-off-by:
Jens Axboe <axboe@fb.com> (cherry picked from commit f36ea50c ) Signed-off-by:
Joseph Salisbury <joseph.salisbury@canonical.com> Acked-by:
Stefan Bader <stefan.bader@canonical.com> Acked-by:
Seth Forshee <seth.forshee@canonical.com> Signed-off-by:
Thadeu Lima de Souza Cascardo <cascardo@canonical.com>
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- 08 Mar, 2017 2 commits
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Gabriel Krisman Bertazi authored
BugLink: http://bugs.launchpad.net/bugs/1662666 In blk_mq_map_swqueue, there is a memory optimization that frees the tags of a queue that has gone unmapped. Later, if that hctx is remapped after another topology change, the tags need to be reallocated. If this allocation fails, a simple WARN_ON triggers, but the block layer ends up with an active hctx without any corresponding set of tags. Then, any income IO to that hctx can trigger an Oops. I can reproduce it consistently by running IO, flipping CPUs on and off and eventually injecting a memory allocation failure in that path. In the fix below, if the system experiences a failed allocation of any hctx's tags, we remap all the ctxs of that queue to the hctx_0, which should always keep it's tags. There is a minor performance hit, since our mapping just got worse after the error path, but this is the simplest solution to handle this error path. The performance hit will disappear after another su...
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Gabriel Krisman Bertazi authored
BugLink: http://bugs.launchpad.net/bugs/1662666 While stressing memory and IO at the same time we changed SMT settings, we were able to consistently trigger deadlocks in the mm system, which froze the entire machine. I think that under memory stress conditions, the large allocations performed by blk_mq_init_rq_map may trigger a reclaim, which stalls waiting on the block layer remmaping completion, thus deadlocking the system. The trace below was collected after the machine stalled, waiting for the hotplug event completion. The simplest fix for this is to make allocations in this path non-reclaimable, with GFP_NOIO. With this patch, We couldn't hit the issue anymore. This should apply on top of Jens's for-next branch cleanly. Changes since v1: - Use GFP_NOIO instead of GFP_NOWAIT. Call Trace: [c000000f0160aaf0] [c000000f0160ab50] 0xc000000f0160ab50 (unreliable) [c000000f0160acc0] [c000000000016624] __switch_to+0x2e4/0x430 [c000000f0160ad20] [c000000000b1a880] __schedule+0x310/0x9b0 [c000000f0160ae00] [c000000000b1af68] schedule+0x48/0xc0 [c000000f0160ae30] [c000000000b1b4b0] schedule_preempt_disabled+0x20/0x30 [c000000f0160ae50] [c000000000b1d4fc] __mutex_lock_slowpath+0xec/0x1f0 [c000000f0160aed0] [c000000000b1d678] mutex_lock+0x78/0xa0 [c000000f0160af00] [d000000019413cac] xfs_reclaim_inodes_ag+0x33c/0x380 [xfs] [c000000f0160b0b0] [d000000019415164] xfs_reclaim_inodes_nr+0x54/0x70 [xfs] [c000000f0160b0f0] [d0000000194297f8] xfs_fs_free_cached_objects+0x38/0x60 [xfs] [c000000f0160b120] [c0000000003172c8] super_cache_scan+0x1f8/0x210 [c000000f0160b190] [c00000000026301c] shrink_slab.part.13+0x21c/0x4c0 [c000000f0160b2d0] [c000000000268088] shrink_zone+0x2d8/0x3c0 [c000000f0160b380] [c00000000026834c] do_try_to_free_pages+0x1dc/0x520 [c000000f0160b450] [c00000000026876c] try_to_free_pages+0xdc/0x250 [c000000f0160b4e0] [c000000000251978] __alloc_pages_nodemask+0x868/0x10d0 [c000000f0160b6f0] [c000000000567030] blk_mq_init_rq_map+0x160/0x380 [c000000f0160b7a0] [c00000000056758c] blk_mq_map_swqueue+0x33c/0x360 [c000000f0160b820] [c000000000567904] blk_mq_queue_reinit+0x64/0xb0 [c000000f0160b850] [c00000000056a16c] blk_mq_queue_reinit_notify+0x19c/0x250 [c000000f0160b8a0] [c0000000000f5d38] notifier_call_chain+0x98/0x100 [c000000f0160b8f0] [c0000000000c5fb0] __cpu_notify+0x70/0xe0 [c000000f0160b930] [c0000000000c63c4] notify_prepare+0x44/0xb0 [c000000f0160b9b0] [c0000000000c52f4] cpuhp_invoke_callback+0x84/0x250 [c000000f0160ba10] [c0000000000c570c] cpuhp_up_callbacks+0x5c/0x120 [c000000f0160ba60] [c0000000000c7cb8] _cpu_up+0xf8/0x1d0 [c000000f0160bac0] [c0000000000c7eb0] do_cpu_up+0x120/0x150 [c000000f0160bb40] [c0000000006fe024] cpu_subsys_online+0x64/0xe0 [c000000f0160bb90] [c0000000006f5124] device_online+0xb4/0x120 [c000000f0160bbd0] [c0000000006f5244] online_store+0xb4/0xc0 [c000000f0160bc20] [c0000000006f0a68] dev_attr_store+0x68/0xa0 [c000000f0160bc60] [c0000000003ccc30] sysfs_kf_write+0x80/0xb0 [c000000f0160bca0] [c0000000003cbabc] kernfs_fop_write+0x17c/0x250 [c000000f0160bcf0] [c00000000030fe6c] __vfs_write+0x6c/0x1e0 [c000000f0160bd90] [c000000000311490] vfs_write+0xd0/0x270 [c000000f0160bde0] [c0000000003131fc] SyS_write+0x6c/0x110 [c000000f0160be30] [c000000000009204] system_call+0x38/0xec Signed-off-by:
Gabriel Krisman Bertazi <krisman@linux.vnet.ibm.com> Cc: Brian King <brking@linux.vnet.ibm.com> Cc: Douglas Miller <dougmill@linux.vnet.ibm.com> Cc: linux-block@vger.kernel.org Cc: linux-scsi@vger.kernel.org Signed-off-by:
Tim Gardner <tim.gardner@canonical.com> Acked-by:
Brad Figg <brad.figg@canonical.com> Signed-off-by:
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- 20 Jan, 2017 1 commit
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Gabriel Krisman Bertazi authored
BugLink: http://bugs.launchpad.net/bugs/1658091 commit c02ebfdd upstream. Commit 0e87e58b ("blk-mq: improve warning for running a queue on the wrong CPU") attempts to avoid triggering the WARN_ON in __blk_mq_run_hw_queue when the expected CPU is dead. Problem is, in the last batch execution before round robin, blk_mq_hctx_next_cpu can schedule a dead CPU and also update next_cpu to the next alive CPU in the mask, which will trigger the WARN_ON despite the previous workaround. The following patch fixes this scenario by always scheduling the value in hctx->next_cpu. This changes the moment when we round-robin the CPU running the hctx, but it really doesn't matter, since it still executes BLK_MQ_CPU_WORK_BATCH times in a row before switching to another CPU. Fixes: 0e87e58b ("blk-mq: improve warning for running a queue on the wrong CPU") Signed-off-by:
Greg Kroah-Hartman <gregkh@linuxfoundation.org> Signed-off-by:
Luis Henriques <luis.henriques@canonical.com>
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- 18 Jan, 2017 1 commit
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Omar Sandoval authored
BugLink: https://bugs.launchpad.net/bugs/1657281 Commit 0809e3ac ("block: fix plug list flushing for nomerge queues") updated blk_mq_make_request() to set request_count even when blk_queue_nomerges() returns true. However, blk_mq_make_request() only does limited plugging and doesn't use request_count; blk_sq_make_request() is the one that should have been fixed. Do that and get rid of the unnecessary work in the mq version. Fixes: 0809e3ac ("block: fix plug list flushing for nomerge queues") Signed-off-by:
Omar Sandoval <osandov@fb.com> Reviewed-by:
Ming Lei <tom.leiming@gmail.com> Reviewed-by:
Jeff Moyer <jmoyer@redhat.com> Signed-off-by:
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- 10 Jan, 2017 1 commit
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Bart Van Assche authored
BugLink: http://bugs.launchpad.net/bugs/1654602 commit bc27c01b upstream. The meaning of the BLK_MQ_S_STOPPED flag is "do not call .queue_rq()". Hence modify blk_mq_make_request() such that requests are queued instead of issued if a queue has been stopped. Reported-by:
Bart Van Assche <bart.vanassche@sandisk.com> Reviewed-by:
Christoph Hellwig <hch@lst.de> Reviewed-by:
Hannes Reinecke <hare@suse.com> Reviewed-by:
Johannes Thumshirn <jthumshirn@suse.de> Reviewed-by:
Sagi Grimberg <sagi@grimberg.me> Signed-off-by:
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- 06 Dec, 2016 1 commit
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Ming Lin authored
BugLink: http://bugs.launchpad.net/bugs/1637565 For some protocols like NVMe over Fabrics we need to be able to send initialization commands to a specific queue. Based on an earlier patch from Christoph Hellwig <hch@lst.de>. Signed-off-by:
Ming Lin <ming.l@ssi.samsung.com> [hch: disallow sleeping allocation, req_op fixes] Signed-off-by:
Keith Busch <keith.busch@intel.com> Signed-off-by:
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- 20 Oct, 2016 1 commit
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Omar Sandoval authored
BugLink: http://bugs.launchpad.net/bugs/1631468 commit 52b9c330 upstream. If ->queue_rq() returns BLK_MQ_RQ_QUEUE_OK, we use continue and skip over the rest of the loop body. However, dptr is assigned later in the loop body, and the BLK_MQ_RQ_QUEUE_OK case is exactly the case that we'd want it for. NVMe isn't actually using BLK_MQ_F_DEFER_ISSUE yet, nor is any other in-tree driver, but if the code's going to be there, it might as well work. Fixes: 74c45052 ("blk-mq: add a 'list' parameter to ->queue_rq()") Signed-off-by:
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- 19 Sep, 2016 3 commits
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Jens Axboe authored
BugLink: http://bugs.launchpad.net/bugs/1620317 We do this in a few places, if the CPU is offline. This isn't allowed, though, since on multi queue hardware, we can't just move a request from one software queue to another, if they map to different hardware queues. The request and tag isn't valid on another hardware queue. This can happen if plugging races with CPU offlining. But it does no harm, since it can only happen in the window where we are currently busy freezing the queue and flushing IO, in preparation for redoing the software <-> hardware queue mappings. Signed-off-by:
Kamal Mostafa <kamal@canonical.com>
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Jens Axboe authored
BugLink: http://bugs.launchpad.net/bugs/1620317 __blk_mq_run_hw_queue() currently warns if we are running the queue on a CPU that isn't set in its mask. However, this can happen if a CPU is being offlined, and the workqueue handling will place the work on CPU0 instead. Improve the warning so that it only triggers if the batch cpu in the hardware queue is currently online. If it triggers for that case, then it's indicative of a flow problem in blk-mq, so we want to retain it for that case. Signed-off-by:
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Gabriel Krisman Bertazi authored
BugLink: http://bugs.launchpad.net/bugs/1620317 In case a submitted request gets stuck for some reason, the block layer can prevent the request starvation by starting the scheduled timeout work. If this stuck request occurs at the same time another thread has started a queue freeze, the blk_mq_timeout_work will not be able to acquire the queue reference and will return silently, thus not issuing the timeout. But since the request is already holding a q_usage_counter reference and is unable to complete, it will never release its reference, preventing the queue from completing the freeze started by first thread. This puts the request_queue in a hung state, forever waiting for the freeze completion. This was observed while running IO to a NVMe device at the same time we toggled the CPU hotplug code. Eventually, once a request got stuck requiring a timeout during a queue freeze, we saw the CPU Hotplug notification code get stuck inside blk_mq_freeze_queue_wait, as shown in the trace below. [c000000deaf13690] [c000000deaf13738] 0xc000000deaf13738 (unreliable) [c000000deaf13860] [c000000000015ce8] __switch_to+0x1f8/0x350 [c000000deaf138b0] [c000000000ade0e4] __schedule+0x314/0x990 [c000000deaf13940] [c000000000ade7a8] schedule+0x48/0xc0 [c000000deaf13970] [c0000000005492a4] blk_mq_freeze_queue_wait+0x74/0x110 [c000000deaf139e0] [c00000000054b6a8] blk_mq_queue_reinit_notify+0x1a8/0x2e0 [c000000deaf13a40] [c0000000000e7878] notifier_call_chain+0x98/0x100 [c000000deaf13a90] [c0000000000b8e08] cpu_notify_nofail+0x48/0xa0 [c000000deaf13ac0] [c0000000000b92f0] _cpu_down+0x2a0/0x400 [c000000deaf13b90] [c0000000000b94a8] cpu_down+0x58/0xa0 [c000000deaf13bc0] [c0000000006d5dcc] cpu_subsys_offline+0x2c/0x50 [c000000deaf13bf0] [c0000000006cd244] device_offline+0x104/0x140 [c000000deaf13c30] [c0000000006cd40c] online_store+0x6c/0xc0 [c000000deaf13c80] [c0000000006c8c78] dev_attr_store+0x68/0xa0 [c000000deaf13cc0] [c0000000003974d0] sysfs_kf_write+0x80/0xb0 [c000000deaf13d00] [c0000000003963e8] kernfs_fop_write+0x188/0x200 [c000000deaf13d50] [c0000000002e0f6c] __vfs_write+0x6c/0xe0 [c000000deaf13d90] [c0000000002e1ca0] vfs_write+0xc0/0x230 [c000000deaf13de0] [c0000000002e2cdc] SyS_write+0x6c/0x110 [c000000deaf13e30] [c000000000009204] system_call+0x38/0xb4 The fix is to allow the timeout work to execute in the window between dropping the initial refcount reference and the release of the last reference, which actually marks the freeze completion. This can be achieved with percpu_refcount_tryget, which does not require the counter to be alive. This way the timeout work can do it's job and terminate a stuck request even during a freeze, returning its reference and avoiding the deadlock. Allowing the timeout to run is just a part of the fix, since for some devices, we might get stuck again inside the device driver's timeout handler, should it attempt to allocate a new request in that path - which is a quite common action for Abort commands, which need to be sent after a timeout. In NVMe, for instance, we call blk_mq_alloc_request from inside the timeout handler, which will fail during a freeze, since it also tries to acquire a queue reference. I considered a similar change to blk_mq_alloc_request as a generic solution for further device driver hangs, but we can't do that, since it would allow new requests to disturb the freeze process. I thought about creating a new function in the block layer to support unfreezable requests for these occasions, but after working on it for a while, I feel like this should be handled in a per-driver basis. I'm now experimenting with changes to the NVMe timeout path, but I'm open to suggestions of ways to make this generic. Signed-off-by:
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- 06 Sep, 2016 2 commits
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Thomas Gleixner authored
BugLink: http://bugs.launchpad.net/bugs/1572630 queue_for_each_ctx() iterates over per_cpu variables under the assumption that the possible cpu mask cannot have holes. That's wrong as all cpumasks can have holes. In case there are holes the iteration ends up accessing uninitialized memory and crashing as a result. Replace the macro by a proper for_each_possible_cpu() loop and drop the unused macro blk_ctx_sum() which references queue_for_each_ctx(). Reported-by:
Xiong Zhou <jencce.kernel@gmail.com> Signed-off-by:
Thomas Gleixner <tglx@linutronix.de> Signed-off-by:
Chris J Arges <chris.j.arges@canonical.com>
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Raghavendra K T authored
BugLink: http://bugs.launchpad.net/bugs/1572630 hctx->cpumask is already populated and let the tag cpumask follow that instead of going through a new for loop. Signed-off-by:
Raghavendra K T <raghavendra.kt@linux.vnet.ibm.com> Reviewed-by:
Sagi Grimberg <sagig@mellanox.com> Signed-off-by:
Eric Desrochers <eric.desrochers@canonical.com> Acked-by:
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- 09 Aug, 2016 1 commit
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Christoph Hellwig authored
BugLink: http://bugs.launchpad.net/bugs/1597908 Timer context is not very useful for drivers to perform any meaningful abort action from. So instead of calling the driver from this useless context defer it to a workqueue as soon as possible. Note that while a delayed_work item would seem the right thing here I didn't dare to use it due to the magic in blk_add_timer that pokes deep into timer internals. But maybe this encourages Tejun to add a sensible API for that to the workqueue API and we'll all be fine in the end :) Contains a major update from Keith Bush: "This patch removes synchronizing the timeout work so that the timer can start a freeze on its own queue. The timer enters the queue, so timer context can only start a freeze, but not wait for frozen." Signed-off-by:
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- 10 Jun, 2016 1 commit
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Keith Busch authored
BugLink: http://bugs.launchpad.net/bugs/1581034 Go directly to ending a request if it wasn't started. Previously, completing a request may invoke a driver callback for a request it didn't initialize. Signed-off-by:
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- 29 Feb, 2016 1 commit
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Christoph Hellwig authored
BugLink: http://bugs.launchpad.net/bugs/1531539 We already have the reserved flag, and a nowait flag awkwardly encoded as a gfp_t. Add a real flags argument to make the scheme more extensible and allow for a nicer calling convention. Signed-off-by:
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- 21 Nov, 2015 1 commit
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Jens Axboe authored
Liu reported that running certain parts of xfstests threw the following error: BUG: sleeping function called from invalid context at mm/page_alloc.c:3190 in_atomic(): 1, irqs_disabled(): 0, pid: 6, name: kworker/u16:0 3 locks held by kworker/u16:0/6: #0: ("writeback"){++++.+}, at: [<ffffffff8107f083>] process_one_work+0x173/0x730 #1: ((&(&wb->dwork)->work)){+.+.+.}, at: [<ffffffff8107f083>] process_one_work+0x173/0x730 #2: (&type->s_umount_key#44){+++++.}, at: [<ffffffff811e6805>] trylock_super+0x25/0x60 CPU: 5 PID: 6 Comm: kworker/u16:0 Tainted: G OE 4.3.0+ #3 Hardware name: Red Hat KVM, BIOS Bochs 01/01/2011 Workqueue: writeback wb_workfn (flush-btrfs-108) ffffffff81a3abab ffff88042e282ba8 ffffffff8130191b ffffffff81a3abab 0000000000000c76 ffff88042e282ba8 ffff88042e27c180 ffff88042e282bd8 ffffffff8108ed95 ffff880400000004 0000000000000000 0000000000000c76 Call Trace: [<ffffffff8130191b>] dump_stack+0x4f/0x74 [<ffffffff8108ed95>] ___might_sleep+0x185/0x240 [<ffffffff8108eea2>] __might_sleep+0x52/0x90 [<ffffffff811817e8>] __alloc_pages_nodemask+0x268/0x410 [<ffffffff8109a43c>] ? sched_clock_local+0x1c/0x90 [<ffffffff8109a6d1>] ? local_clock+0x21/0x40 [<ffffffff810b9eb0>] ? __lock_release+0x420/0x510 [<ffffffff810b534c>] ? __lock_acquired+0x16c/0x3c0 [<ffffffff811ca265>] alloc_pages_current+0xc5/0x210 [<ffffffffa0577105>] ? rbio_is_full+0x55/0x70 [btrfs] [<ffffffff810b7ed8>] ? mark_held_locks+0x78/0xa0 [<ffffffff81666d50>] ? _raw_spin_unlock_irqrestore+0x40/0x60 [<ffffffffa0578c0a>] full_stripe_write+0x5a/0xc0 [btrfs] [<ffffffffa0578ca9>] __raid56_parity_write+0x39/0x60 [btrfs] [<ffffffffa0578deb>] run_plug+0x11b/0x140 [btrfs] [<ffffffffa0578e33>] btrfs_raid_unplug+0x23/0x70 [btrfs] [<ffffffff812d36c2>] blk_flush_plug_list+0x82/0x1f0 [<ffffffff812e0349>] blk_sq_make_request+0x1f9/0x740 [<ffffffff812ceba2>] ? generic_make_request_checks+0x222/0x7c0 [<ffffffff812cf264>] ? blk_queue_enter+0x124/0x310 [<ffffffff812cf1d2>] ? blk_queue_enter+0x92/0x310 [<ffffffff812d0ae2>] generic_make_request+0x172/0x2c0 [<ffffffff812d0ad4>] ? generic_make_request+0x164/0x2c0 [<ffffffff812d0ca0>] submit_bio+0x70/0x140 [<ffffffffa0577b29>] ? rbio_add_io_page+0x99/0x150 [btrfs] [<ffffffffa0578a89>] finish_rmw+0x4d9/0x600 [btrfs] [<ffffffffa0578c4c>] full_stripe_write+0x9c/0xc0 [btrfs] [<ffffffffa057ab7f>] raid56_parity_write+0xef/0x160 [btrfs] [<ffffffffa052bd83>] btrfs_map_bio+0xe3/0x2d0 [btrfs] [<ffffffffa04fbd6d>] btrfs_submit_bio_hook+0x8d/0x1d0 [btrfs] [<ffffffffa05173c4>] submit_one_bio+0x74/0xb0 [btrfs] [<ffffffffa0517f55>] submit_extent_page+0xe5/0x1c0 [btrfs] [<ffffffffa0519b18>] __extent_writepage_io+0x408/0x4c0 [btrfs] [<ffffffffa05179c0>] ? alloc_dummy_extent_buffer+0x140/0x140 [btrfs] [<ffffffffa051dc88>] __extent_writepage+0x218/0x3a0 [btrfs] [<ffffffff810b7ed8>] ? mark_held_locks+0x78/0xa0 [<ffffffffa051e2c9>] extent_write_cache_pages.clone.0+0x2f9/0x400 [btrfs] [<ffffffffa051e422>] extent_writepages+0x52/0x70 [btrfs] [<ffffffffa05001f0>] ? btrfs_set_inode_index+0x70/0x70 [btrfs] [<ffffffffa04fcc17>] btrfs_writepages+0x27/0x30 [btrfs] [<ffffffff81184df3>] do_writepages+0x23/0x40 [<ffffffff81212229>] __writeback_single_inode+0x89/0x4d0 [<ffffffff81212a60>] ? writeback_sb_inodes+0x260/0x480 [<ffffffff81212a60>] ? writeback_sb_inodes+0x260/0x480 [<ffffffff8121295f>] ? writeback_sb_inodes+0x15f/0x480 [<ffffffff81212ad2>] writeback_sb_inodes+0x2d2/0x480 [<ffffffff810b1397>] ? down_read_trylock+0x57/0x60 [<ffffffff811e6805>] ? trylock_super+0x25/0x60 [<ffffffff810d629f>] ? rcu_read_lock_sched_held+0x4f/0x90 [<ffffffff81212d0c>] __writeback_inodes_wb+0x8c/0xc0 [<ffffffff812130b5>] wb_writeback+0x2b5/0x500 [<ffffffff810b7ed8>] ? mark_held_locks+0x78/0xa0 [<ffffffff810660a8>] ? __local_bh_enable_ip+0x68/0xc0 [<ffffffff81213362>] ? wb_do_writeback+0x62/0x310 [<ffffffff812133c1>] wb_do_writeback+0xc1/0x310 [<ffffffff8107c3d9>] ? set_worker_desc+0x79/0x90 [<ffffffff81213842>] wb_workfn+0x92/0x330 [<ffffffff8107f133>] process_one_work+0x223/0x730 [<ffffffff8107f083>] ? process_one_work+0x173/0x730 [<ffffffff8108035f>] ? worker_thread+0x18f/0x430 [<ffffffff810802ed>] worker_thread+0x11d/0x430 [<ffffffff810801d0>] ? maybe_create_worker+0xf0/0xf0 [<ffffffff810801d0>] ? maybe_create_worker+0xf0/0xf0 [<ffffffff810858df>] kthread+0xef/0x110 [<ffffffff8108f74e>] ? schedule_tail+0x1e/0xd0 [<ffffffff810857f0>] ? __init_kthread_worker+0x70/0x70 [<ffffffff816673bf>] ret_from_fork+0x3f/0x70 [<ffffffff810857f0>] ? __init_kthread_worker+0x70/0x70 The issue is that we've got the software context pinned while calling blk_flush_plug_list(), which flushes callbacks that are allowed to sleep. btrfs and raid has such callbacks. Flip the checks around a bit, so we can enable preempt a bit earlier and flush plugs without having preempt disabled. This only affects blk-mq driven devices, and only those that register a single queue. Reported-by:Liu Bo <bo.li.liu@oracle.com> Tested-by:
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- 11 Nov, 2015 1 commit
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Jens Axboe authored
It's no longer used outside of blk-mq core. Signed-off-by:
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- 07 Nov, 2015 4 commits
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Jens Axboe authored
Return a cookie, blk_qc_t, from the blk-mq make request functions, that allows a later caller to uniquely identify a specific IO. The cookie doesn't mean anything to the caller, but the caller can use it to later pass back to the block layer. The block layer can then identify the hardware queue and request from that cookie. Signed-off-by:
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Jens Axboe authored
No functional changes in this patch, but it prepares us for returning a more useful cookie related to the IO that was queued up. Signed-off-by:
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Mel Gorman authored
__GFP_WAIT was used to signal that the caller was in atomic context and could not sleep. Now it is possible to distinguish between true atomic context and callers that are not willing to sleep. The latter should clear __GFP_DIRECT_RECLAIM so kswapd will still wake. As clearing __GFP_WAIT behaves differently, there is a risk that people will clear the wrong flags. This patch renames __GFP_WAIT to __GFP_RECLAIM to clearly indicate what it does -- setting it allows all reclaim activity, clearing them prevents it. [akpm@linux-foundation.org: fix build] [akpm@linux-foundation.org: coding-style fixes] Signed-off-by:
Mel Gorman <mgorman@techsingularity.net> Acked-by:
Michal Hocko <mhocko@suse.com> Acked-by:
Vlastimil Babka <vbabka@suse.cz> Acked-by:
Johannes Weiner <hannes@cmpxchg.org> Cc: Christoph Lameter <cl@linux.com> Acked-by:
David Rientjes <rientjes@google.com> Cc: Vitaly Wool <vitalywool@gmail.com> Cc: Rik van Riel <riel@redhat.com> Signed-off-by:
Andrew Morton <akpm@linux-foundation.org> Signed-off-by:
Linus Torvalds <torvalds@linux-foundation.org>
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Mel Gorman authored
mm, page_alloc: distinguish between being unable to sleep, unwilling to sleep and avoiding waking kswapd __GFP_WAIT has been used to identify atomic context in callers that hold spinlocks or are in interrupts. They are expected to be high priority and have access one of two watermarks lower than "min" which can be referred to as the "atomic reserve". __GFP_HIGH users get access to the first lower watermark and can be called the "high priority reserve". Over time, callers had a requirement to not block when fallback options were available. Some have abused __GFP_WAIT leading to a situation where an optimisitic allocation with a fallback option can access atomic reserves. This patch uses __GFP_ATOMIC to identify callers that are truely atomic, cannot sleep and have no alternative. High priority users continue to use __GFP_HIGH. __GFP_DIRECT_RECLAIM identifies callers that can sleep and are willing to enter direct reclaim. __GFP_KSWAPD_RECLAIM to identify callers that want to wake kswapd for background reclaim. __GFP_WAIT is redefined as a caller that is willing to enter direct reclaim and wake kswapd for background reclaim. This patch then converts a number of sites o __GFP_ATOMIC is used by callers that are high priority and have memory pools for those requests. GFP_ATOMIC uses this flag. o Callers that have a limited mempool to guarantee forward progress clear __GFP_DIRECT_RECLAIM but keep __GFP_KSWAPD_RECLAIM. bio allocations fall into this category where kswapd will still be woken but atomic reserves are not used as there is a one-entry mempool to guarantee progress. o Callers that are checking if they are non-blocking should use the helper gfpflags_allow_blocking() where possible. This is because checking for __GFP_WAIT as was done historically now can trigger false positives. Some exceptions like dm-crypt.c exist where the code intent is clearer if __GFP_DIRECT_RECLAIM is used instead of the helper due to flag manipulations. o Callers that built their own GFP flags instead of starting with GFP_KERNEL and friends now also need to specify __GFP_KSWAPD_RECLAIM. The first key hazard to watch out for is callers that removed __GFP_WAIT and was depending on access to atomic reserves for inconspicuous reasons. In some cases it may be appropriate for them to use __GFP_HIGH. The second key hazard is callers that assembled their own combination of GFP flags instead of starting with something like GFP_KERNEL. They may now wish to specify __GFP_KSWAPD_RECLAIM. It's almost certainly harmless if it's missed in most cases as other activity will wake kswapd. Signed-off-by:
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- 03 Nov, 2015 1 commit
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Jeff Moyer authored
Hi, Zhangqing Luo reported long boot times on a system with thousands of LUNs when scsi-mq was enabled. He narrowed the problem down to blk_mq_add_queue_tag_set, where every queue is frozen in order to set the BLK_MQ_F_TAG_SHARED flag. Each added device will freeze all queues added before it in sequence, which involves waiting for an RCU grace period for each one. We don't need to do this. After the second queue is added, only new queues need to be initialized with the shared tag. We can do that by percolating the flag up to the blk_mq_tag_set, and updating the newly added queue's hctxs if the flag is set. This problem was introduced by commit 0d2602ca (blk-mq: improve support for shared tags maps). Reported-and-tested-by:
Jason Luo <zhangqing.luo@oracle.com> Reviewed-by:
Ming Lei <ming.lei@canonical.com> Signed-off-by:
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- 21 Oct, 2015 5 commits
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Ming Lei authored
Most of times, flush plug should be the hottest I/O path, so mark ctx as pending after all requests in the list are inserted. Reviewed-by:
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Ming Lei authored
The trace point is for tracing plug event of each request queue instead of each task, so we should check the request count in the plug list from current queue instead of current task. Signed-off-by:
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Ming Lei authored
It isn't necessary to try to merge the bio which is marked as NOMERGE. Reviewed-by:
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Jeff Moyer authored
Request queues with merging disabled will not flush the plug list after BLK_MAX_REQUEST_COUNT requests have been queued, since the code relies on blk_attempt_plug_merge to compute the request_count. Fix this by computing the number of queued requests even for nomerge queues. Signed-off-by:
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Dan Williams authored
Allow pmem, and other synchronous/bio-based block drivers, to fallback on a per-cpu reference count managed by the core for tracking queue live/dead state. The existing per-cpu reference count for the blk_mq case is promoted to be used in all block i/o scenarios. This involves initializing it by default, waiting for it to drop to zero at exit, and holding a live reference over the invocation of q->make_request_fn() in generic_make_request(). The blk_mq code continues to take its own reference per blk_mq request and retains the ability to freeze the queue, but the check that the queue is frozen is moved to generic_make_request(). This fixes crash signatures like the following: BUG: unable to handle kernel paging request at ffff880140000000 [..] Call Trace: [<ffffffff8145e8bf>] ? copy_user_handle_tail+0x5f/0x70 [<ffffffffa004e1e0>] pmem_do_bvec.isra.11+0x70/0xf0 [nd_pmem] [<ffffffffa004e331>] pmem_make_request+0xd1/0x200 [nd_pmem] [<ffffffff811c3162>] ? mempool_alloc+0x72/0x1a0 [<ffffffff8141f8b6>] generic_make_request+0xd6/0x110 [<ffffffff8141f966>] submit_bio+0x76/0x170 [<ffffffff81286dff>] submit_bh_wbc+0x12f/0x160 [<ffffffff81286e62>] submit_bh+0x12/0x20 [<ffffffff813395bd>] jbd2_write_superblock+0x8d/0x170 [<ffffffff8133974d>] jbd2_mark_journal_empty+0x5d/0x90 [<ffffffff813399cb>] jbd2_journal_destroy+0x24b/0x270 [<ffffffff810bc4ca>] ? put_pwq_unlocked+0x2a/0x30 [<ffffffff810bc6f5>] ? destroy_workqueue+0x225/0x250 [<ffffffff81303494>] ext4_put_super+0x64/0x360 [<ffffffff8124ab1a>] generic_shutdown_super+0x6a/0xf0 Cc: Jens Axboe <axboe@kernel.dk> Cc: Keith Busch <keith.busch@intel.com> Cc: Ross Zwisler <ross.zwisler@linux.intel.com> Suggested-by:
Ross Zwisler <ross.zwisler@linux.intel.com> Signed-off-by:
Dan Williams <dan.j.williams@intel.com> Signed-off-by:
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- 15 Oct, 2015 1 commit
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Junichi Nomura authored
tags is freed in blk_mq_free_rq_map() and should not be used after that. The problem doesn't manifest if CONFIG_CPUMASK_OFFSTACK is false because free_cpumask_var() is nop. tags->cpumask is allocated in blk_mq_init_tags() so it's natural to free cpumask in its counter part, blk_mq_free_tags(). Fixes: f26cdc85 ("blk-mq: Shared tag enhancements") Signed-off-by:
Jun'ichi Nomura <j-nomura@ce.jp.nec.com> Cc: Keith Busch <keith.busch@intel.com> Reviewed-by:
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- 01 Oct, 2015 2 commits
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Christoph Hellwig authored
And replace the blk_mq_tag_busy_iter with it - the driver use has been replaced with a new helper a while ago, and internal to the block we only need the new version. Signed-off-by:
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Christoph Hellwig authored
blk_mq_complete_request may be a no-op if the request has already been completed by others means (e.g. a timeout or cancellation), but currently drivers have to set rq->errors before calling blk_mq_complete_request, which might leave us with the wrong error value. Add an error parameter to blk_mq_complete_request so that we can defer setting rq->errors until we known we won the race to complete the request. Signed-off-by:
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- 29 Sep, 2015 6 commits
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Akinobu Mita authored
CPU hotplug handling for blk-mq (blk_mq_queue_reinit) acquires all_q_mutex in blk_mq_queue_reinit_notify() and then removes sysfs entries by blk_mq_sysfs_unregister(). Removing sysfs entry needs to be blocked until the active reference of the kernfs_node to be zero. On the other hand, reading blk_mq_hw_sysfs_cpu sysfs entry (e.g. /sys/block/nullb0/mq/0/cpu_list) acquires all_q_mutex in blk_mq_hw_sysfs_cpus_show(). If these happen at the same time, a deadlock can happen. Because one can wait for the active reference to be zero with holding all_q_mutex, and the other tries to acquire all_q_mutex with holding the active reference. The reason that all_q_mutex is acquired in blk_mq_hw_sysfs_cpus_show() is to avoid reading an imcomplete hctx->cpumask. Since reading sysfs entry for blk-mq needs to acquire q->sysfs_lock, we can avoid deadlock and reading an imcomplete hctx->cpumask by protecting q->sysfs_lock while hctx->cpumask is being updated. Signed-off-by:
Akinobu Mita <akinobu.mita@gmail.com> Reviewed-by:
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Akinobu Mita authored
Notifier callbacks for CPU_ONLINE action can be run on the other CPU than the CPU which was just onlined. So it is possible for the process running on the just onlined CPU to insert request and run hw queue before establishing new mapping which is done by blk_mq_queue_reinit_notify(). This can cause a problem when the CPU has just been onlined first time since the request queue was initialized. At this time ctx->index_hw for the CPU, which is the index in hctx->ctxs[] for this ctx, is still zero before blk_mq_queue_reinit_notify() is called by notifier callbacks for CPU_ONLINE action. For example, there is a single hw queue (hctx) and two CPU queues (ctx0 for CPU0, and ctx1 for CPU1). Now CPU1 is just onlined and a request is inserted into ctx1->rq_list and set bit0 in pending bitmap as ctx1->index_hw is still zero. And then while running hw queue, flush_busy_ctxs() finds bit0 is set in pending bitmap and tries to retrieve requests in ...
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Akinobu Mita authored
CPU hotplug handling for blk-mq (blk_mq_queue_reinit) accesses q->mq_usage_counter while freezing all request queues in all_q_list. On the other hand, q->mq_usage_counter is deinitialized in blk_mq_free_queue() before deleting the queue from all_q_list. So if CPU hotplug event occurs in the window, percpu_ref_kill() is called with q->mq_usage_counter which has already been marked dead, and it triggers warning. Fix it by deleting the queue from all_q_list earlier than destroying q->mq_usage_counter. Signed-off-by:
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Akinobu Mita authored
CPU hotplug handling for blk-mq (blk_mq_queue_reinit) updates q->mq_map by blk_mq_update_queue_map() for all request queues in all_q_list. On the other hand, q->mq_map is released before deleting the queue from all_q_list. So if CPU hotplug event occurs in the window, invalid memory access can happen. Fix it by releasing q->mq_map in blk_mq_release() to make it happen latter than removal from all_q_list. Signed-off-by:
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Akinobu Mita authored
There is a race between cpu hotplug handling and adding/deleting gendisk for blk-mq, where both are trying to register and unregister the same sysfs entries. null_add_dev --> blk_mq_init_queue --> blk_mq_init_allocated_queue --> add to 'all_q_list' (*) --> add_disk --> blk_register_queue --> blk_mq_register_disk (++) null_del_dev --> del_gendisk --> blk_unregister_queue --> blk_mq_unregister_disk (--) --> blk_cleanup_queue --> blk_mq_free_queue --> del from 'all_q_list' (*) blk_mq_queue_reinit --> blk_mq_sysfs_unregister (-) --> blk_mq_sysfs_register (+) While the request queue is added to 'all_q_list' (*), blk_mq_queue_reinit() can be called for the queue anytime by CPU hotplug callback. But blk_mq_sysfs_unregister (-) and blk_mq_sysfs_register (+) in blk_mq_queue_reinit must not be called before blk_mq_register_disk (++) and after blk_mq_unregister_disk (--) is finished. Because '/sys/block/*/mq/' is not exists. There has already been BLK_MQ_F_SYSFS_UP flag in hctx->flags which can be used to track these sysfs stuff, but it is only fixing this issue partially. In order to fix it completely, we just need per-queue flag instead of per-hctx flag with appropriate locking. So this introduces q->mq_sysfs_init_done which is properly protected with all_q_mutex. Also, we need to ensure that blk_mq_map_swqueue() is called with all_q_mutex is held. Since hctx->nr_ctx is reset temporarily and updated in blk_mq_map_swqueue(), so we should avoid blk_mq_register_hctx() seeing the temporary hctx->nr_ctx value in CPU hotplug handling or adding/deleting gendisk . Signed-off-by: -
Akinobu Mita authored
When unmapped hw queue is remapped after CPU topology is changed, hctx->tags->cpumask has to be set after hctx->tags is setup in blk_mq_map_swqueue(), otherwise it causes null pointer dereference. Fixes: f26cdc85 ("blk-mq: Shared tag enhancements") Signed-off-by:
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- 23 Sep, 2015 1 commit
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Catalin Marinas authored
The pages allocated for struct request contain pointers to other slab allocations (via ops->init_request). Since kmemleak does not track/scan page allocations, the slab objects will be reported as leaks (false positives). This patch adds kmemleak callbacks to allow tracking of such pages. Signed-off-by:
Catalin Marinas <catalin.marinas@arm.com> Reported-by:
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- 15 Aug, 2015 1 commit
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Ming Lei authored
Inside timeout handler, blk_mq_tag_to_rq() is called to retrieve the request from one tag. This way is obviously wrong because the request can be freed any time and some fiedds of the request can't be trusted, then kernel oops might be triggered[1]. Currently wrt. blk_mq_tag_to_rq(), the only special case is that the flush request can share same tag with the request cloned from, and the two requests can't be active at the same time, so this patch fixes the above issue by updating tags->rqs[tag] with the active request(either flush rq or the request cloned from) of the tag. Also blk_mq_tag_to_rq() gets much simplified with this patch. Given blk_mq_tag_to_rq() is mainly for drivers and the caller must make sure the request can't be freed, so in bt_for_each() this helper is replaced with tags->rqs[tag]. [1] kernel oops log [ 439.696220] BUG: unable to handle kernel NULL pointer dereference at 0000000000000158^M [ 439.697162] IP: [<ffffffff812d89ba>] blk_mq_tag_to_rq+0x21/0x6e^M [ 439.700653] PGD 7ef765067 PUD 7ef764067 PMD 0 ^M [ 439.700653] Oops: 0000 [#1] PREEMPT SMP DEBUG_PAGEALLOC ^M [ 439.700653] Dumping ftrace buffer:^M [ 439.700653] (ftrace buffer empty)^M [ 439.700653] Modules linked in: nbd ipv6 kvm_intel kvm serio_raw^M [ 439.700653] CPU: 6 PID: 2779 Comm: stress-ng-sigfd Not tainted 4.2.0-rc5-next-20150805+ #265^M [ 439.730500] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Bochs 01/01/2011^M [ 439.730500] task: ffff880605308000 ti: ffff88060530c000 task.ti: ffff88060530c000^M [ 439.730500] RIP: 0010:[<ffffffff812d89ba>] [<ffffffff812d89ba>] blk_mq_tag_to_rq+0x21/0x6e^M [ 439.730500] RSP: 0018:ffff880819203da0 EFLAGS: 00010283^M [ 439.730500] RAX: ffff880811b0e000 RBX: ffff8800bb465f00 RCX: 0000000000000002^M [ 439.730500] RDX: 0000000000000000 RSI: 0000000000000202 RDI: 0000000000000000^M [ 439.730500] RBP: ffff880819203db0 R08: 0000000000000002 R09: 0000000000000000^M [ 439.730500] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000202^M [ 439.730500] R13: ffff880814104800 R14: 0000000000000002 R15: ffff880811a2ea00^M [ 439.730500] FS: 00007f165b3f5740(0000) GS:ffff880819200000(0000) knlGS:0000000000000000^M [ 439.730500] CS: 0010 DS: 0000 ES: 0000 CR0: 000000008005003b^M [ 439.730500] CR2: 0000000000000158 CR3: 00000007ef766000 CR4: 00000000000006e0^M [ 439.730500] Stack:^M [ 439.730500] 0000000000000008 ffff8808114eed90 ffff880819203e00 ffffffff812dc104^M [ 439.755663] ffff880819203e40 ffffffff812d9f5e 0000020000000000 ffff8808114eed80^M [ 439.755663] Call Trace:^M [ 439.755663] <IRQ> ^M [ 439.755663] [<ffffffff812dc104>] bt_for_each+0x6e/0xc8^M [ 439.755663] [<ffffffff812d9f5e>] ? blk_mq_rq_timed_out+0x6a/0x6a^M [ 439.755663] [<ffffffff812d9f5e>] ? blk_mq_rq_timed_out+0x6a/0x6a^M [ 439.755663] [<ffffffff812dc1b3>] blk_mq_tag_busy_iter+0x55/0x5e^M [ 439.755663] [<ffffffff812d88b4>] ? blk_mq_bio_to_request+0x38/0x38^M [ 439.755663] [<ffffffff812d8911>] blk_mq_rq_timer+0x5d/0xd4^M [ 439.755663] [<ffffffff810a3e10>] call_timer_fn+0xf7/0x284^M [ 439.755663] [<ffffffff810a3d1e>] ? call_timer_fn+0x5/0x284^M [ 439.755663] [<ffffffff812d88b4>] ? blk_mq_bio_to_request+0x38/0x38^M [ 439.755663] [<ffffffff810a46d6>] run_timer_softirq+0x1ce/0x1f8^M [ 439.755663] [<ffffffff8104c367>] __do_softirq+0x181/0x3a4^M [ 439.755663] [<ffffffff8104c76e>] irq_exit+0x40/0x94^M [ 439.755663] [<ffffffff81031482>] smp_apic_timer_interrupt+0x33/0x3e^M [ 439.755663] [<ffffffff815559a4>] apic_timer_interrupt+0x84/0x90^M [ 439.755663] <EOI> ^M [ 439.755663] [<ffffffff81554350>] ? _raw_spin_unlock_irq+0x32/0x4a^M [ 439.755663] [<ffffffff8106a98b>] finish_task_switch+0xe0/0x163^M [ 439.755663] [<ffffffff8106a94d>] ? finish_task_switch+0xa2/0x163^M [ 439.755663] [<ffffffff81550066>] __schedule+0x469/0x6cd^M [ 439.755663] [<ffffffff8155039b>] schedule+0x82/0x9a^M [ 439.789267] [<ffffffff8119b28b>] signalfd_read+0x186/0x49a^M [ 439.790911] [<ffffffff8106d86a>] ? wake_up_q+0x47/0x47^M [ 439.790911] [<ffffffff811618c2>] __vfs_read+0x28/0x9f^M [ 439.790911] [<ffffffff8117a289>] ? __fget_light+0x4d/0x74^M [ 439.790911] [<ffffffff811620a7>] vfs_read+0x7a/0xc6^M [ 439.790911] [<ffffffff8116292b>] SyS_read+0x49/0x7f^M [ 439.790911] [<ffffffff81554c17>] entry_SYSCALL_64_fastpath+0x12/0x6f^M [ 439.790911] Code: 48 89 e5 e8 a9 b8 e7 ff 5d c3 0f 1f 44 00 00 55 89 f2 48 89 e5 41 54 41 89 f4 53 48 8b 47 60 48 8b 1c d0 48 8b 7b 30 48 8b 53 38 <48> 8b 87 58 01 00 00 48 85 c0 75 09 48 8b 97 88 0c 00 00 eb 10 ^M [ 439.790911] RIP [<ffffffff812d89ba>] blk_mq_tag_to_rq+0x21/0x6e^M [ 439.790911] RSP <ffff880819203da0>^M [ 439.790911] CR2: 0000000000000158^M [ 439.790911] ---[ end trace d40af58949325661 ]---^M Cc: <stable@vger.kernel.org> Signed-off-by:
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- 13 Aug, 2015 1 commit
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Kent Overstreet authored
The way the block layer is currently written, it goes to great lengths to avoid having to split bios; upper layer code (such as bio_add_page()) checks what the underlying device can handle and tries to always create bios that don't need to be split. But this approach becomes unwieldy and eventually breaks down with stacked devices and devices with dynamic limits, and it adds a lot of complexity. If the block layer could split bios as needed, we could eliminate a lot of complexity elsewhere - particularly in stacked drivers. Code that creates bios can then create whatever size bios are convenient, and more importantly stacked drivers don't have to deal with both their own bio size limitations and the limitations of the (potentially multiple) devices underneath them. In the future this will let us delete merge_bvec_fn and a bunch of other code. We do this by adding calls to blk_queue_split() to the various make_request functions that need it - a few can already handle arbitrary size bios. Note that we add the call _after_ any call to blk_queue_bounce(); this means that blk_queue_split() and blk_recalc_rq_segments() don't need to be concerned with bouncing affecting segment merging. Some make_request_fn() callbacks were simple enough to audit and verify they don't need blk_queue_split() calls. The skipped ones are: * nfhd_make_request (arch/m68k/emu/nfblock.c) * axon_ram_make_request (arch/powerpc/sysdev/axonram.c) * simdisk_make_request (arch/xtensa/platforms/iss/simdisk.c) * brd_make_request (ramdisk - drivers/block/brd.c) * mtip_submit_request (drivers/block/mtip32xx/mtip32xx.c) * loop_make_request * null_queue_bio * bcache's make_request fns Some others are almost certainly safe to remove now, but will be left for future patches. Cc: Jens Axboe <axboe@kernel.dk> Cc: Christoph Hellwig <hch@infradead.org> Cc: Al Viro <viro@zeniv.linux.org.uk> Cc: Ming Lei <ming.lei@canonical.com> Cc: Neil Brown <neilb@suse.de> Cc: Alasdair Kergon <agk@redhat.com> Cc: Mike Snitzer <snitzer@redhat.com> Cc: dm-devel@redhat.com Cc: Lars Ellenberg <drbd-dev@lists.linbit.com> Cc: drbd-user@lists.linbit.com Cc: Jiri Kosina <jkosina@suse.cz> Cc: Geoff Levand <geoff@infradead.org> Cc: Jim Paris <jim@jtan.com> Cc: Philip Kelleher <pjk1939@linux.vnet.ibm.com> Cc: Minchan Kim <minchan@kernel.org> Cc: Nitin Gupta <ngupta@vflare.org> Cc: Oleg Drokin <oleg.drokin@intel.com> Cc: Andreas Dilger <andreas.dilger@intel.com> Acked-by: NeilBrown <neilb@suse.de> (for the 'md/md.c' bits) Acked-by:
Mike Snitzer <snitzer@redhat.com> Reviewed-by:
Martin K. Petersen <martin.petersen@oracle.com> Signed-off-by:
Kent Overstreet <kent.overstreet@gmail.com> [dpark: skip more mq-based drivers, resolve merge conflicts, etc.] Signed-off-by:
Dongsu Park <dpark@posteo.net> Signed-off-by:
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