- 27 Sep, 2022 5 commits
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Christoph Hellwig authored
The combinations of an error check with an ERR_PTR return and a lookup with a NULL return leads to ugly handling of the return values in the callers. Just open coding the check and the lookup is much simpler. Signed-off-by:
Christoph Hellwig <hch@lst.de> Reviewed-by:
Andreas Herrmann <aherrmann@suse.de> Acked-by:
Tejun Heo <tj@kernel.org> Link: https://lore.kernel.org/r/20220921180501.1539876-6-hch@lst.deSigned-off-by:
Jens Axboe <axboe@kernel.dk>
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Christoph Hellwig authored
Add a fully inlined blkg_lookup as the extra two checks aren't going to generated a lot more code vs the call to the slowpath routine, and open code the hint update in the two callers that care. Signed-off-by:
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Christoph Hellwig authored
Use blkg_lookup instead of open coding it. Signed-off-by:
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Christoph Hellwig authored
Just open code it in the only caller and drop the unused !BLK_CGROUP stub. Signed-off-by:
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Christoph Hellwig authored
When blk_throtl_init fails, we need to call blk_ioprio_exit. Switch to proper goto based unwinding to fix this. Signed-off-by:
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- 24 Sep, 2022 9 commits
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Liu Song authored
High-performance NVMe devices usually support a large hw queues, which ensures a 1:1 mapping of hctx and ctx. In this case there will be no remote request, so we don't need to care about it. Signed-off-by:
Liu Song <liusong@linux.alibaba.com> Link: https://lore.kernel.org/r/1663731123-81536-1-git-send-email-liusong@linux.alibaba.comSigned-off-by:
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Yu Kuai authored
"tg->has_rules" is extended to "tg->has_rules_iops/bps", thus bios that don't need to be throttled can be checked accurately. With this patch, bio will be throttled if: 1) Bio is read/write, and corresponding read/write iops limit exist. 2) If corresponding doesn't exist, corresponding bps limit exist and bio is not throttled before. Signed-off-by:
Yu Kuai <yukuai3@huawei.com> Acked-by:
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Yu Kuai authored
Currently, "tg->has_rules" and "tg->flags & THROTL_TG_HAS_IOPS_LIMIT" both try to bypass bios that don't need to be throttled, however, they are a little redundant and both not perfect: 1) "tg->has_rules" only distinguish read and write, but not iops and bps limit. 2) "tg->flags & THROTL_TG_HAS_IOPS_LIMIT" only check if iops limit exist, read and write is not distinguished, and bps limit is not checked. tg->has_rules will extended to distinguish bps and iops in the following patch. There is no need to keep the flag. Signed-off-by:
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ZiyangZhang authored
START_USER_RECOVERY and END_USER_RECOVERY are two new control commands to support user recovery feature. After a crash, user should send START_USER_RECOVERY, it will: (1) check if (a)current ublk_device is UBLK_S_DEV_QUIESCED which was set by quiesce_work and (b)chardev is released (2) reinit all ubqs, including: (a) put the task_struct and reset ->ubq_daemon to NULL. (b) reset all ublk_io. (3) reset ub->mm to NULL. Then, user should start a new process and send FETCH_REQ on each ubq_daemon. Finally, user should send END_USER_RECOVERY, it will: (1) wait for all new ubq_daemons getting ready. (2) update ublksrv_pid (3) unquiesce the request queue and expect incoming ublk_queue_rq() (4) convert ub's state to UBLK_S_DEV_LIVE Note: we can handle STOP_DEV between START_USER_RECOVERY and END_USER_RECOVERY. This is helpful to users who cannot start new process after sending START_USER_RECOVERY ctrl-cmd. Signed-off-by:ZiyangZhang <ZiyangZhang@linux.alibaba.com> Reviewed-by:
Ming Lei <ming.lei@redhat.com> Link: https://lore.kernel.org/r/20220923153919.44078-7-ZiyangZhang@linux.alibaba.comSigned-off-by:
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ZiyangZhang authored
UBLK_F_USER_RECOVERY_REISSUE implies that: With a dying ubq_daemon, ublk_drv let monitor_work requeues rq issued to userspace(ublksrv) before the ubq_daemon is dying. UBLK_F_USER_RECOVERY_REISSUE is designed for backends which: (1) tolerate double-write since ublk_drv may issue the same rq twice. (2) does not let frontend users get I/O error, such as read-only FS and VM backend. Signed-off-by: -
ZiyangZhang authored
With USER_RECOVERY feature enabled, the monitor_work schedules quiesce_work after finding a dying ubq_daemon. The monitor_work should also abort all rqs issued to userspace before the ubq_daemon is dying. The quiesce_work's job is to: (1) quiesce request queue. (2) check if there is any INFLIGHT rq. If so, we retry until all these rqs are requeued and become IDLE. These rqs should be requeued by ublk_queue_rq(), task work, io_uring fallback wq or monitor_work. (3) complete all ioucmds by calling io_uring_cmd_done(). We are safe to do so because no ioucmd can be referenced now. (5) set ub's state to UBLK_S_DEV_QUIESCED, which means we are ready for recovery. This state is exposed to userspace by GET_DEV_INFO. The driver can always handle STOP_DEV and cleanup everything no matter ub's state is LIVE or QUIESCED. After ub's state is UBLK_S_DEV_QUIESCED, user can recover with new process. Note: we do not change the default behavior with reocvery feature disabled. monitor_work still schedules stop_work and abort inflight rqs. And finally ublk_device is released. Signed-off-by: -
ZiyangZhang authored
With recovery feature enabled, in ublk_queue_rq or task work (in exit_task_work or fallback wq), we requeue rqs instead of ending(aborting) them. Besides, No matter recovery feature is enabled or disabled, we schedule monitor_work immediately. Signed-off-by:
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ZiyangZhang authored
Define some macros for recovery feature. UBLK_S_DEV_QUIESCED implies that ublk_device is quiesced and is ready for recovery. This state can be observed by userspace. UBLK_F_USER_RECOVERY implies that: (1) ublk_drv enables recovery feature. It won't let monitor_work to automatically abort rqs and release the device. (2) With a dying ubq_daemon, ublk_drv ends(aborts) rqs issued to userspace(ublksrv) before crash. (3) With a dying ubq_daemon, in task work and ublk_queue_rq(), ublk_drv requeues rqs. Signed-off-by: -
ZiyangZhang authored
This check is not atomic. So with recovery feature, ubq_daemon may be modified simultaneously by recovery task. Instead, check 'current' is safe here because 'current' never changes. Also add comment explaining this check, which is really important for understanding recovery feature. Signed-off-by:
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- 23 Sep, 2022 1 commit
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Jens Axboe authored
Merge branch 'md-next' of https://git.kernel.org/pub/scm/linux/kernel/git/song/md into for-6.1/block Pull MD updates and fixes from Song: "1. Various raid5 fix and clean up, by Logan Gunthorpe and David Sloan. 2. Raid10 performance optimization, by Yu Kuai." * 'md-next' of https://git.kernel.org/pub/scm/linux/kernel/git/song/md: md: Fix spelling mistake in comments of r5l_log md/raid5: Wait for MD_SB_CHANGE_PENDING in raid5d md/raid10: convert resync_lock to use seqlock md/raid10: fix improper BUG_ON() in raise_barrier() md/raid10: prevent unnecessary calls to wake_up() in fast path md/raid10: don't modify 'nr_waitng' in wait_barrier() for the case nowait md/raid10: factor out code from wait_barrier() to stop_waiting_barrier() md: Remove extra mddev_get() in md_seq_start() md/raid5: Remove unnecessary bio_put() in raid5_read_one_chunk() md/raid5: Ensure stripe_fill happens on non-read IO with journal md/raid5: Don't read ->active_stripes if it's not needed md/raid5: Cleanup prototype of raid5_get_active_stripe() md/raid5: Drop extern on function declarations in raid5.h md/raid5: Refactor raid5_get_active_stripe() md: Replace snprintf with scnprintf md/raid10: fix compile warning md/raid5: Fix spelling mistakes in comments
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- 22 Sep, 2022 23 commits
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Zhou nan authored
Fix spelling of dones't in comments. Signed-off-by:
Zhou nan <zhounan@nfschina.com> Signed-off-by:
Song Liu <song@kernel.org>
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Logan Gunthorpe authored
A complicated deadlock exists when using the journal and an elevated group_thrtead_cnt. It was found with loop devices, but its not clear whether it can be seen with real disks. The deadlock can occur simply by writing data with an fio script. When the deadlock occurs, multiple threads will hang in different ways: 1) The group threads will hang in the blk-wbt code with bios waiting to be submitted to the block layer: io_schedule+0x70/0xb0 rq_qos_wait+0x153/0x210 wbt_wait+0x115/0x1b0 io_schedule+0x70/0xb0 rq_qos_wait+0x153/0x210 wbt_wait+0x115/0x1b0 __rq_qos_throttle+0x38/0x60 blk_mq_submit_bio+0x589/0xcd0 wbt_wait+0x115/0x1b0 __rq_qos_throttle+0x38/0x60 blk_mq_submit_bio+0x589/0xcd0 __submit_bio+0xe6/0x100 submit_bio_noacct_nocheck+0x42e/0x470 submit_bio_noacct+0x4c2/0xbb0 ops_run_io+0x46b/0x1a30 handle_stripe+0xcd3/0x36b0 handle_active_stripes.constprop.0+0x6f6/0xa60 raid5_do_work+0x177/0x330 Or: io_schedule+0x70/0xb0 rq_qos_wait+0x153/0x210 wbt_wait+0x115/0x1b0 __rq_qos_throttle+0x38/0x60 blk_mq_submit_bio+0x589/0xcd0 __submit_bio+0xe6/0x100 submit_bio_noacct_nocheck+0x42e/0x470 submit_bio_noacct+0x4c2/0xbb0 flush_deferred_bios+0x136/0x170 raid5_do_work+0x262/0x330 2) The r5l_reclaim thread will hang in the same way, submitting a bio to the block layer: io_schedule+0x70/0xb0 rq_qos_wait+0x153/0x210 wbt_wait+0x115/0x1b0 __rq_qos_throttle+0x38/0x60 blk_mq_submit_bio+0x589/0xcd0 __submit_bio+0xe6/0x100 submit_bio_noacct_nocheck+0x42e/0x470 submit_bio_noacct+0x4c2/0xbb0 submit_bio+0x3f/0xf0 md_super_write+0x12f/0x1b0 md_update_sb.part.0+0x7c6/0xff0 md_update_sb+0x30/0x60 r5l_do_reclaim+0x4f9/0x5e0 r5l_reclaim_thread+0x69/0x30b However, before hanging, the MD_SB_CHANGE_PENDING flag will be set for sb_flags in r5l_write_super_and_discard_space(). This flag will never be cleared because the submit_bio() call never returns. 3) Due to the MD_SB_CHANGE_PENDING flag being set, handle_stripe() will do no processing on any pending stripes and re-set STRIPE_HANDLE. This will cause the raid5d thread to enter an infinite loop, constantly trying to handle the same stripes stuck in the queue. The raid5d thread has a blk_plug that holds a number of bios that are also stuck waiting seeing the thread is in a loop that never schedules. These bios have been accounted for by blk-wbt thus preventing the other threads above from continuing when they try to submit bios. --Deadlock. To fix this, add the same wait_event() that is used in raid5_do_work() to raid5d() such that if MD_SB_CHANGE_PENDING is set, the thread will schedule and wait until the flag is cleared. The schedule action will flush the plug which will allow the r5l_reclaim thread to continue, thus preventing the deadlock. However, md_check_recovery() calls can also clear MD_SB_CHANGE_PENDING from the same thread and can thus deadlock if the thread is put to sleep. So avoid waiting if md_check_recovery() is being called in the loop. It's not clear when the deadlock was introduced, but the similar wait_event() call in raid5_do_work() was added in 2017 by this commit: 16d997b7 ("md/raid5: simplfy delaying of writes while metadata is updated.") Link: https://lore.kernel.org/r/7f3b87b6-b52a-f737-51d7-a4eec5c44112@deltatee.comSigned-off-by:Logan Gunthorpe <logang@deltatee.com> Signed-off-by:
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Song Liu authored
This patchset tries to avoid that two locks are held unconditionally in hot path. Test environment: Architecture: aarch64 Huawei KUNPENG 920 x86 Intel(R) Xeon(R) Platinum 8380 Raid10 initialize: mdadm --create /dev/md0 --level 10 --bitmap none --raid-devices 4 \ /dev/nvme0n1 /dev/nvme1n1 /dev/nvme2n1 /dev/nvme3n1 Test cmd: (task set -c 0-15) fio -name=0 -ioengine=libaio -direct=1 -\ group_reporting=1 -randseed=2022 -rwmixread=70 -refill_buffers \ -filename=/dev/md0 -numjobs=16 -runtime=60s -bs=4k -iodepth=256 \ -rw=randread Test result: aarch64: before this patchset: 3.2 GiB/s bind node before this patchset: 6.9 Gib/s after this patchset: 7.9 Gib/s bind node after this patchset: 8.0 Gib/s x86:(bind node is not tested yet) before this patchset: 7.0 GiB/s after this patchset : 9.3 GiB/s Please noted that in the test machine, memory access latency is very bad across nodes compare to local node in aarch64, which is why bandwidth while bind node is much better. -
Yu Kuai authored
Currently, wait_barrier() will hold 'resync_lock' to read 'conf->barrier', and io can't be dispatched until 'barrier' is dropped. Since holding the 'barrier' is not common, convert 'resync_lock' to use seqlock so that holding lock can be avoided in fast path. Signed-off-by:
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Yu Kuai authored
'conf->barrier' is protected by 'conf->resync_lock', reading 'conf->barrier' without holding the lock is wrong. Signed-off-by:
Guoqing Jiang <guoqing.jiang@linux.dev> Signed-off-by:
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Yu Kuai authored
Currently, wake_up() is called unconditionally in fast path such as raid10_make_request(), which will cause lock contention under high concurrency: raid10_make_request wake_up __wake_up_common_lock spin_lock_irqsave Improve performance by only call wake_up() if waitqueue is not empty in allow_barrier() and raid10_make_request(). Signed-off-by:
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Yu Kuai authored
For the case nowait in wait_barrier(), there is no point to increase nr_waiting and then decrease it. Signed-off-by:
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Yu Kuai authored
Currently the nasty condition in wait_barrier() is hard to read. This patch factors out the condition into a function. There are no functional changes. Signed-off-by:
Paul Menzel <pmenzel@molgen.mpg.de> Reviewed-by:
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Logan Gunthorpe authored
A regression is seen where mddev devices stay permanently after they are stopped due to an elevated reference count. This was tracked down to an extra mddev_get() in md_seq_start(). It only happened rarely because most of the time the md_seq_start() is called with a zero offset. The path with an extra mddev_get() only happens when it starts with a non-zero offset. The commit noted below changed an mddev_get() to check its success but inadvertently left the original call in. Remove the extra call. Fixes: 12a6caf2 ("md: only delete entries from all_mddevs when the disk is freed") Signed-off-by:
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David Sloan authored
When running chunk-sized reads on disks with badblocks duplicate bio free/puts are observed: ============================================================================= BUG bio-200 (Not tainted): Object already free ----------------------------------------------------------------------------- Allocated in mempool_alloc_slab+0x17/0x20 age=3 cpu=2 pid=7504 __slab_alloc.constprop.0+0x5a/0xb0 kmem_cache_alloc+0x31e/0x330 mempool_alloc_slab+0x17/0x20 mempool_alloc+0x100/0x2b0 bio_alloc_bioset+0x181/0x460 do_mpage_readpage+0x776/0xd00 mpage_readahead+0x166/0x320 blkdev_readahead+0x15/0x20 read_pages+0x13f/0x5f0 page_cache_ra_unbounded+0x18d/0x220 force_page_cache_ra+0x181/0x1c0 page_cache_sync_ra+0x65/0xb0 filemap_get_pages+0x1df/0xaf0 filemap_read+0x1e1/0x700 blkdev_read_iter+0x1e5/0x330 vfs_read+0x42a/0x570 Freed in mempool_free_slab+0x17/0x20 age=3 cpu=2 pid=7504 kmem_cache_free+0x46d/0x490 mempool_free_slab+0x17/0x20 mempool_free+0x66/0x190 bio_free+0x78/0x90 bio_put+0x100/0x1a0 raid5_make_request+0x2259/0x2450 md_handle_request+0x402/0x600 md_submit_bio+0xd9/0x120 __submit_bio+0x11f/0x1b0 submit_bio_noacct_nocheck+0x204/0x480 submit_bio_noacct+0x32e/0xc70 submit_bio+0x98/0x1a0 mpage_readahead+0x250/0x320 blkdev_readahead+0x15/0x20 read_pages+0x13f/0x5f0 page_cache_ra_unbounded+0x18d/0x220 Slab 0xffffea000481b600 objects=21 used=0 fp=0xffff8881206d8940 flags=0x17ffffc0010201(locked|slab|head|node=0|zone=2|lastcpupid=0x1fffff) CPU: 0 PID: 34525 Comm: kworker/u24:2 Not tainted 6.0.0-rc2-localyes-265166-gf11c5343fa3f #143 Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.13.0-1ubuntu1.1 04/01/2014 Workqueue: raid5wq raid5_do_work Call Trace: <TASK> dump_stack_lvl+0x5a/0x78 dump_stack+0x10/0x16 print_trailer+0x158/0x165 object_err+0x35/0x50 free_debug_processing.cold+0xb7/0xbe __slab_free+0x1ae/0x330 kmem_cache_free+0x46d/0x490 mempool_free_slab+0x17/0x20 mempool_free+0x66/0x190 bio_free+0x78/0x90 bio_put+0x100/0x1a0 mpage_end_io+0x36/0x150 bio_endio+0x2fd/0x360 md_end_io_acct+0x7e/0x90 bio_endio+0x2fd/0x360 handle_failed_stripe+0x960/0xb80 handle_stripe+0x1348/0x3760 handle_active_stripes.constprop.0+0x72a/0xaf0 raid5_do_work+0x177/0x330 process_one_work+0x616/0xb20 worker_thread+0x2bd/0x6f0 kthread+0x179/0x1b0 ret_from_fork+0x22/0x30 </TASK> The double free is caused by an unnecessary bio_put() in the if(is_badblock(...)) error path in raid5_read_one_chunk(). The error path was moved ahead of bio_alloc_clone() in c82aa1b7 ("md/raid5: move checking badblock before clone bio in raid5_read_one_chunk"). The previous code checked and freed align_bio which required a bio_put. After the move that is no longer needed as raid_bio is returned to the control of the common io path which performs its own endio resulting in a double free on bad device blocks. Fixes: c82aa1b7 ("md/raid5: move checking badblock before clone bio in raid5_read_one_chunk") Signed-off-by:David Sloan <david.sloan@eideticom.com> Signed-off-by:
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Logan Gunthorpe authored
When doing degrade/recover tests using the journal a kernel BUG is hit at drivers/md/raid5.c:4381 in handle_parity_checks5(): BUG_ON(!test_bit(R5_UPTODATE, &dev->flags)); This was found to occur because handle_stripe_fill() was skipped for stripes in the journal due to a condition in that function. Thus blocks were not fetched and R5_UPTODATE was not set when the code reached handle_parity_checks5(). To fix this, don't skip handle_stripe_fill() unless the stripe is for read. Fixes: 07e83364 ("md/r5cache: shift complex rmw from read path to write path") Link: https://lore.kernel.org/linux-raid/e05c4239-41a9-d2f7-3cfa-4aa9d2cea8c1@deltatee.com/Suggested-by:
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Logan Gunthorpe authored
The atomic_read() is not needed in many cases so only do the read after the first checks are done. Suggested-by:
Christoph Hellwig <hch@infradead.org> Signed-off-by:
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Logan Gunthorpe authored
Drop the three bools in the prototype of raid5_get_active_stripe() and replace them with a flags parameter. At the same time, drop the distinction with __raid5_get_active_stripe(). Suggested-by:
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Logan Gunthorpe authored
externs should not be used in function declarations, so clean those up. Signed-off-by:
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Logan Gunthorpe authored
Refactor raid5_get_active_stripe() without the gotos with an explicit infinite loop and some additional nesting. Suggested-by:
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Saurabh Sengar authored
Current code produces a warning as shown below when total characters in the constituent block device names plus the slashes exceeds 200. snprintf() returns the number of characters generated from the given input, which could cause the expression “200 – len” to wrap around to a large positive number. Fix this by using scnprintf() instead, which returns the actual number of characters written into the buffer. [ 1513.267938] ------------[ cut here ]------------ [ 1513.267943] WARNING: CPU: 15 PID: 37247 at <snip>/lib/vsprintf.c:2509 vsnprintf+0x2c8/0x510 [ 1513.267944] Modules linked in: <snip> [ 1513.267969] CPU: 15 PID: 37247 Comm: mdadm Not tainted 5.4.0-1085-azure #90~18.04.1-Ubuntu [ 1513.267969] Hardware name: Microsoft Corporation Virtual Machine/Virtual Machine, BIOS Hyper-V UEFI Release v4.1 05/09/2022 [ 1513.267971] RIP: 0010:vsnprintf+0x2c8/0x510 <-snip-> [ 1513.267982] Call Trace: [ 1513.267986] snprintf+0x45/0x70 [ 1513.267990] ? disk_name+0x71/0xa0 [ 1513.267993] dump_zones+0x114/0x240 [raid0] [ 1513.267996] ? _cond_resched+0x19/0x40 [ 1513.267998] raid0_run+0x19e/0x270 [raid0] [ 1513.268000] md_run+0x5e0/0xc50 [ 1513.268003] ? security_capable+0x3f/0x60 [ 1513.268005] do_md_run+0x19/0x110 [ 1513.268006] md_ioctl+0x195e/0x1f90 [ 1513.268007] blkdev_ioctl+0x91f/0x9f0 [ 1513.268010] block_ioctl+0x3d/0x50 [ 1513.268012] do_vfs_ioctl+0xa9/0x640 [ 1513.268014] ? __fput+0x162/0x260 [ 1513.268016] ksys_ioctl+0x75/0x80 [ 1513.268017] __x64_sys_ioctl+0x1a/0x20 [ 1513.268019] do_syscall_64+0x5e/0x200 [ 1513.268021] entry_SYSCALL_64_after_hwframe+0x44/0xa9 Fixes: 76603884 ("md/raid0: replace printk() with pr_*()") Reviewed-by:
Michael Kelley <mikelley@microsoft.com> Acked-by:
Saurabh Sengar <ssengar@linux.microsoft.com> Signed-off-by:
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Guoqing Jiang authored
With W=1, compiler complains. drivers/md/raid10.c:1983: warning: bad line: Signed-off-by:
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XU pengfei authored
Fix spelling of 'waitting' in comments. Signed-off-by:
XU pengfei <xupengfei@nfschina.com> Signed-off-by:
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Li Jinlin authored
Since blk-ioprio handing was converted from a rqos policy to a direct call, RQ_QOS_IOPRIO is not used anymore, just delete it. Signed-off-by:
Li Jinlin <lijinlin3@huawei.com> Reviewed-by:
Jan Kara <jack@suse.cz> Reviewed-by:
Bart Van Assche <bvanassche@acm.org> Reviewed-by:
Chaitanya Kulkarni <kch@nvidia.com> Link: https://lore.kernel.org/r/20220916023241.32926-1-lijinlin3@huawei.comSigned-off-by:
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Liu Shixin authored
Use DEFINE_SHOW_ATTRIBUTE helper macro to simplify the code. Signed-off-by:
Liu Shixin <liushixin2@huawei.com> Link: https://lore.kernel.org/r/20220915023424.3198940-1-liushixin2@huawei.comSigned-off-by:
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Wolfram Sang authored
Follow the advice of the below link and prefer 'strscpy' in this subsystem. Conversion is 1:1 because the return value is not used. Generated by a coccinelle script. Link: https://lore.kernel.org/r/CAHk-=wgfRnXz0W3D37d01q3JFkr_i_uTL=V6A6G1oUZcprmknw@mail.gmail.com/Signed-off-by:
Wolfram Sang <wsa+renesas@sang-engineering.com> Acked-by:
Christoph Böhmwalder <christoph.boehmwalder@linbit.com> Acked-by:
Geoff Levand <geoff@infradead.org> Link: https://lore.kernel.org/r/20220818205958.6552-1-wsa+renesas@sang-engineering.comSigned-off-by:
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Gaosheng Cui authored
All implementations of req->collision, _req_may_be_done and drbd_fail_pending_reads have been removed, so remove the comments in receive_DataReply() that provide no useful information. Signed-off-by:
Gaosheng Cui <cuigaosheng1@huawei.com> Acked-by:
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Gaosheng Cui authored
The _req_may_be_done() has been removed by commit 6870ca6d ("drbd: factor out master_bio completion and drbd_request destruction paths"), so remove the orphan declaration. Signed-off-by:
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- 21 Sep, 2022 2 commits
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Yu Kuai authored
Our test found a problem that wbt inflight counter is negative, which will cause io hang(noted that this problem doesn't exist in mainline): t1: device create t2: issue io add_disk blk_register_queue wbt_enable_default wbt_init rq_qos_add // wb_normal is still 0 /* * in mainline, disk can't be opened before * bdev_add(), however, in old kernels, disk * can be opened before blk_register_queue(). */ blkdev_issue_flush // disk size is 0, however, it's not checked submit_bio_wait submit_bio blk_mq_submit_bio rq_qos_throttle wbt_wait bio_to_wbt_flags rwb_enabled // wb_normal is 0, inflight is not increased wbt_queue_depth_changed(&rwb->rqos); wbt_update_limits // wb_normal is initialized rq_qos_track wbt_track rq->wbt_flags |= bio_to_wbt_flags(rwb, bio); // wb_normal is not 0，wbt_flags will be set t3: io completion blk_mq_free_request rq_qos_done wbt_done wbt_is_tracked // return true __wbt_done wbt_rqw_done atomic_dec_return(&rqw->inflight); // inflight is decreased commit 8235b5c1 ("block: call bdev_add later in device_add_disk") can avoid this problem, however it's better to fix this problem in wbt: 1) Lower kernel can't backport this patch due to lots of refactor. 2) Root cause is that wbt call rq_qos_add() before wb_normal is initialized. Fixes: e34cbd30 ("blk-wbt: add general throttling mechanism") Cc: <stable@vger.kernel.org> Signed-off-by: -
Christoph Hellwig authored
Given that rnbd_srv_sess_dev already has an open_flags member, there is no need for the rnbd_dev indirection as a simple block_device pointer works just as well. Signed-off-by:
Jack Wang <jinpu.wang@ionos.com> Link: https://lore.kernel.org/r/20220909131509.3263924-5-hch@lst.deSigned-off-by:
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