btrfs: handle allocation failure in btrfs_wq_submit_bio gracefully

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btrfs_wq_submit_bio is used for writeback under memory pressure.
Instead of failing the I/O when we can't allocate the async_submit_bio,
just punt back to the synchronous submission path.

Reviewed-by: Nikolay Borisov <nborisov@suse.com>
Tested-by: Nikolay Borisov <nborisov@suse.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: David Sterba <dsterba@suse.com>

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Christoph Hellwig 2022-06-17 12:04:12 +02:00 • committed by David Sterba

parent 82443fd55c

commit ea1f0cedef

3 changed files with 36 additions and 30 deletions

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43

fs/btrfs/disk-io.c

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6

fs/btrfs/disk-io.h

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17

fs/btrfs/inode.c

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