btrfs: allow btrfs_submit_bio to split bios

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Currently the I/O submitters have to split bios according to the chunk
stripe boundaries.  This leads to extra lookups in the extent trees and
a lot of boilerplate code.

To drop this requirement, split the bio when __btrfs_map_block returns a
mapping that is smaller than the requested size and keep a count of
pending bios in the original btrfs_bio so that the upper level
completion is only invoked when all clones have completed.

Based on a patch from Qu Wenruo.

Reviewed-by: Josef Bacik <josef@toxicpanda.com>
Reviewed-by: Johannes Thumshirn <johannes.thumshirn@wdc.com>
Reviewed-by: Qu Wenruo <wqu@suse.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: David Sterba <dsterba@suse.com>

...

This commit is contained in:

Christoph Hellwig 2023-01-21 07:50:20 +01:00 • committed by David Sterba

parent 542e300e83

commit 852eee62d3

2 changed files with 93 additions and 18 deletions

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110

fs/btrfs/bio.c

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1

fs/btrfs/bio.h

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