From: Christoph Hellwig <hch@lst.de>
Date: Wed, 3 May 2023 15:24:29 +0000 (+0200)
Subject: btrfs: do not try to unlock the extent for non-subpage metadata reads
X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=3d66b4b27d2b7f5e74071256acea38108f9dbeb5;p=linux.git

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>
---

diff --git a/fs/btrfs/extent_io.c b/fs/btrfs/extent_io.c
index 4581ee5a08350..e35dfae57e50f 100644
--- a/fs/btrfs/extent_io.c
+++ b/fs/btrfs/extent_io.c
@@ -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);