ovl: punt write aio completion to workqueue

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We want to protect concurrent updates of ovl inode size and mtime
(i.e. ovl_copyattr()) from aio completion context.

Punt write aio completion to a workqueue so that we can protect
ovl_copyattr() with a spinlock.

Export sb_init_dio_done_wq(), so that overlayfs can use its own
dio workqueue to punt aio completions.

Suggested-by: Jens Axboe <axboe@kernel.dk>
Link: https://lore.kernel.org/r/8620dfd3-372d-4ae0-aa3f-2fe97dda1bca@kernel.dk/
Signed-off-by: Amir Goldstein <amir73il@gmail.com>

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This commit is contained in:

Amir Goldstein 2023-08-22 20:50:59 +03:00

parent 5f034d3473

commit 389a4a4a19

2 changed files with 42 additions and 1 deletions

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42

fs/overlayfs/file.c

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1

fs/super.c

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