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btrfs: add an ordered_extent pointer to struct btrfs_bio

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Add a pointer to the ordered_extent to the existing union in struct
btrfs_bio, so all code dealing with data write bios can just use a
pointer dereference to retrieve the ordered_extent instead of doing
multiple rbtree lookups per I/O.

The reference to this ordered_extent is dropped at end I/O time,
which implies that an extra one must be acquired when the bio is split.
This also requires moving the btrfs_extract_ordered_extent call into
btrfs_split_bio so that the invariant of always having a valid
ordered_extent reference for the btrfs_bio is kept.

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 09:54:02 +02:00
committed by David Sterba
parent 112397acc3
commit ec63b84d46
6 changed files with 49 additions and 23 deletions
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2
fs/btrfs/compression.c
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@@ -303,10 +303,10 @@ void btrfs_submit_compressed_write(struct btrfs_ordered_extent *ordered,
INIT_WORK(&cb->write_end_work, btrfs_finish_compressed_write_work);
cb->nr_pages = nr_pages;
cb->bbio.bio.bi_iter.bi_sector = ordered->disk_bytenr >> SECTOR_SHIFT;
cb->bbio.ordered = ordered;
btrfs_add_compressed_bio_pages(cb);
btrfs_submit_bio(&cb->bbio, 0);
btrfs_put_ordered_extent(ordered);
}
/*