btrfs: introduce submit_compressed_bio() for compression

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The new helper, submit_compressed_bio(), will aggregate the following
work:

- Increase compressed_bio::pending_bios
- Remap the endio function
- Map and submit the bio

This slightly reorders calls to btrfs_csum_one_bio or
btrfs_lookup_bio_sums but but none of them does anything regarding IO
submission so this is effectively no change. We mainly care about order
of

- atomic_inc
- btrfs_bio_wq_end_io
- btrfs_map_bio

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

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Qu Wenruo 2021-09-27 15:21:52 +08:00 • committed by David Sterba

parent 6853c64a6e

commit 2d4e0b84b4

1 changed files with 19 additions and 26 deletions

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fs/btrfs/compression.c

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