- 06 Mar, 2023 1 commit
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Coly Li authored
This is an already known issue that dm-thin volume cannot be used as swap, otherwise a deadlock may happen when dm-thin internal memory demand triggers swap I/O on the dm-thin volume itself. But thanks to commit a666e5c0 ("dm: fix deadlock when swapping to encrypted device"), the limit_swap_bios target flag can also be used for dm-thin to avoid the recursive I/O when it is used as swap. Fix is to simply set ti->limit_swap_bios to true in both pool_ctr() and thin_ctr(). In my test, I create a dm-thin volume /dev/vg/swap and use it as swap device. Then I run fio on another dm-thin volume /dev/vg/main and use large --blocksize to trigger swap I/O onto /dev/vg/swap. The following fio command line is used in my test, fio --name recursive-swap-io --lockmem 1 --iodepth 128 \ --ioengine libaio --filename /dev/vg/main --rw randrw \ --blocksize 1M --numjobs 32 --time_based --runtime=12h Without this fix, the whole system can be locked up within 15 seconds. With this fix, there is no any deadlock or hung task observed after 2 hours of running fio. Furthermore, if blocksize is changed from 1M to 128M, after around 30 seconds fio has no visible I/O, and the out-of-memory killer message shows up in kernel message. After around 20 minutes all fio processes are killed and the whole system is back to being alive. This is exactly what is expected when recursive I/O happens on dm-thin volume when it is used as swap. Depends-on: a666e5c0 ("dm: fix deadlock when swapping to encrypted device") Cc: stable@vger.kernel.org Signed-off-by:
Coly Li <colyli@suse.de> Acked-by:
Mikulas Patocka <mpatocka@redhat.com> Signed-off-by:
Mike Snitzer <snitzer@kernel.org>
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- 20 Feb, 2023 1 commit
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XU pengfei authored
Pointer variables of void * type do not require type cast. Signed-off-by:
XU pengfei <xupengfei@nfschina.com> Signed-off-by:
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- 17 Feb, 2023 4 commits
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Hou Tao authored
__hash_remove() removes hash_cell with _hash_lock locked, so acquiring _hash_lock can guarantee no-NULL hc returned from dm_get_mdptr() must have not been removed and hc->md must still be md. __hash_remove() also acquires dm_hash_cells_mutex before setting mdptr as NULL. So in dm_copy_name_and_uuid(), after acquiring dm_hash_cells_mutex and ensuring returned hc is not NULL, the returned hc must still be alive and hc->md must still be md. Remove the unnecessary hc->md != md checks when using dm_get_mdptr() with _hash_lock or dm_hash_cells_mutex acquired. Signed-off-by:
Hou Tao <houtao1@huawei.com> Signed-off-by:
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Mike Snitzer authored
Also update dm_early_create() to take _hash_lock when calling both __get_name_cell and __hash_remove -- given dm_early_create()'s early boot usecase this locking isn't about correctness but it allows lockdep_assert_held() to be added to __hash_remove. Signed-off-by: -
Mike Snitzer authored
Otherwise on resource constrained systems these workqueues may be too greedy. Signed-off-by: -
Mike Snitzer authored
Otherwise on resource constrained systems these workqueues may be too greedy. Signed-off-by:
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- 16 Feb, 2023 2 commits
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Mike Snitzer authored
Otherwise the while() loop in dm_wq_requeue_work() can result in a "dead loop" on systems that have preemption disabled. This is particularly problematic on single cpu systems. Fixes: 8b211aac ("dm: add two stage requeue mechanism") Cc: stable@vger.kernel.org Signed-off-by:
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Pingfan Liu authored
Otherwise the while() loop in dm_wq_work() can result in a "dead loop" on systems that have preemption disabled. This is particularly problematic on single cpu systems. Cc: stable@vger.kernel.org Signed-off-by:
Pingfan Liu <piliu@redhat.com> Acked-by:
Ming Lei <ming.lei@redhat.com> Signed-off-by:
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- 14 Feb, 2023 32 commits
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Thomas Weißschuh authored
Since commit ee6d3dd4 ("driver core: make kobj_type constant.") the driver core allows the usage of const struct kobj_type. Take advantage of this to constify the structure definition to prevent modification at runtime. Signed-off-by:
Thomas Weißschuh <linux@weissschuh.net> Signed-off-by:
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Tetsuo Handa authored
Flushing system-wide workqueues is dangerous and will be forbidden. Use a local workqueue in dm-mpath.c, dm-raid1.c, and dm-stripe.c. Link: https://lkml.kernel.org/r/49925af7-78a8-a3dd-bce6-cfc02e1a9236@I-love.SAKURA.ne.jpSigned-off-by:
Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp> Signed-off-by:
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Mike Snitzer authored
Commit acfe0ad7 ("dm: allocate a special workqueue for deferred device removal") switched from using system workqueue to a single workqueue local to DM. But it didn't eliminate the call to flush_scheduled_work() that was introduced purely for the benefit of deferred device removal with commit 2c140a24 ("dm: allow remove to be deferred"). Since DM core uses its own workqueue (and queue_work) there is no need to call flush_scheduled_work() from local_exit(). local_exit()'s destroy_workqueue(deferred_remove_workqueue) handles flushing work started with queue_work(). Fixes: acfe0ad7 ("dm: allocate a special workqueue for deferred device removal") Signed-off-by:
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Heinz Mauelshagen authored
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Heinz Mauelshagen authored
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Heinz Mauelshagen authored
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Heinz Mauelshagen authored
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Heinz Mauelshagen authored
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Heinz Mauelshagen authored
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Heinz Mauelshagen authored
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Heinz Mauelshagen authored
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Heinz Mauelshagen authored
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Heinz Mauelshagen authored
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Heinz Mauelshagen authored
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Heinz Mauelshagen authored
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Heinz Mauelshagen authored
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Heinz Mauelshagen authored
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Heinz Mauelshagen authored
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Heinz Mauelshagen authored
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Heinz Mauelshagen authored
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Heinz Mauelshagen authored
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Heinz Mauelshagen authored
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Heinz Mauelshagen authored
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Heinz Mauelshagen authored
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Heinz Mauelshagen authored
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Heinz Mauelshagen authored
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Heinz Mauelshagen authored
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Heinz Mauelshagen authored
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Heinz Mauelshagen authored
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Heinz Mauelshagen authored
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Heinz Mauelshagen authored
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Heinz Mauelshagen authored
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