btrfs: scrub: move scrub_setup_ctx allocation out of device_list_mutex

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The scrub context is allocated with GFP_KERNEL and called from
btrfs_scrub_dev under the fs_info::device_list_mutex. This is not safe
regarding reclaim that could try to flush filesystem data in order to
get the memory. And the device_list_mutex is held during superblock
commit, so this would cause a lockup.

Move the alocation and initialization before any changes that require
the mutex.

Signed-off-by: David Sterba <dsterba@suse.com>

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This commit is contained in:

David Sterba 2018-12-04 16:11:56 +01:00

parent 92f7ba434f

commit 0e94c4f45d

1 changed files with 18 additions and 12 deletions

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fs/btrfs/scrub.c

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