btrfs: limit write bios to a single ordered extent

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Currently buffered writeback bios are allowed to span multiple
ordered_extents, although that basically never actually happens since
commit 4a445b7b61 ("btrfs: don't merge pages into bio if their page
offset is not contiguous").

Supporting bios than span ordered_extents complicates the file
checksumming code, and prevents us from adding an ordered_extent pointer
to the btrfs_bio structure.  Use the existing code to limit a bio to
single ordered_extent for zoned device writes for all writes.

This allows to remove the REQ_BTRFS_ONE_ORDERED flags, and the
handling of multiple ordered_extents in btrfs_csum_one_bio.

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

...

This commit is contained in:

Christoph Hellwig 2023-05-31 09:53:55 +02:00 • committed by David Sterba

parent c731cd0b6d

commit a39da514eb

5 changed files with 2 additions and 55 deletions

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3

fs/btrfs/bio.c

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3

fs/btrfs/bio.h

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2

fs/btrfs/compression.c

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11

fs/btrfs/extent_io.c

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38

fs/btrfs/file-item.c

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