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authorLiu Bo <bo.liu@linux.alibaba.com>2018-08-23 03:51:50 +0800
committerDavid Sterba <dsterba@suse.com>2018-10-15 17:23:33 +0200
commite3d039656384288bbe952413d8d404b3035fe7d7 (patch)
tree0a1f7bfe1f829f2ba99c938ab0ffb03eb27fa6ac /fs/btrfs/backref.c
parent5c9d028b3b174e5cf3678a7b0c14e21e51665793 (diff)
downloadlinux-e3d039656384288bbe952413d8d404b3035fe7d7.tar.bz2
Btrfs: delayed-refs: use rb_first_cached for ref_tree
rb_first_cached() trades an extra pointer "leftmost" for doing the same job as rb_first() but in O(1). Functions manipulating href->ref_tree need to get the first entry, this converts href->ref_tree to use rb_first_cached(). For more details about the optimization see patch "Btrfs: delayed-refs: use rb_first_cached for href_root". Tested-by: Holger Hoffstätte <holger@applied-asynchrony.com> Signed-off-by: Liu Bo <bo.liu@linux.alibaba.com> Reviewed-by: David Sterba <dsterba@suse.com> Signed-off-by: David Sterba <dsterba@suse.com>
Diffstat (limited to 'fs/btrfs/backref.c')
-rw-r--r--fs/btrfs/backref.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/fs/btrfs/backref.c b/fs/btrfs/backref.c
index 84006e3dd105..1854835e082b 100644
--- a/fs/btrfs/backref.c
+++ b/fs/btrfs/backref.c
@@ -769,7 +769,7 @@ static int add_delayed_refs(const struct btrfs_fs_info *fs_info,
btrfs_disk_key_to_cpu(&tmp_op_key, &extent_op->key);
spin_lock(&head->lock);
- for (n = rb_first(&head->ref_tree); n; n = rb_next(n)) {
+ for (n = rb_first_cached(&head->ref_tree); n; n = rb_next(n)) {
node = rb_entry(n, struct btrfs_delayed_ref_node,
ref_node);
if (node->seq > seq)