btrfs: add an ordered_extent pointer to struct btrfs_bio
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>
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112397ac
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