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btrfs: do not try to unlock the extent for non-subpage metadata reads 

Only subpage metadata reads lock the extent.  Don't try to unlock it and
waste cycles in the extent tree lookup for PAGE_SIZE or larger metadata.

Reviewed-by: Johannes Thumshirn <johannes.thumshirn@wdc.com>
Reviewed-by: Josef Bacik <josef@toxicpanda.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
Christoph Hellwig 2023-05-03 17:24:29 +02:00 committed by David Sterba
parent 046b562b20
commit 3d66b4b27d
1 changed files with 4 additions and 2 deletions
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6
fs/btrfs/extent_io.c
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@ -4208,8 +4208,10 @@ static void extent_buffer_read_end_io(struct btrfs_bio *bbio)
bio_offset += bvec->bv_len;
}
unlock_extent(&bbio->inode->io_tree, eb->start,
eb->start + bio_offset - 1, NULL);
if (eb->fs_info->nodesize < PAGE_SIZE) {
unlock_extent(&bbio->inode->io_tree, eb->start,
eb->start + bio_offset - 1, NULL);
}
free_extent_buffer(eb);
bio_put(&bbio->bio);