From f2071b21553bf8f1eae583e32b9068393f61cbe9 Mon Sep 17 00:00:00 2001 From: Filipe Manana Date: Wed, 12 Feb 2014 15:05:53 +0000 Subject: [PATCH] Btrfs: more efficient split extent state insertion When we split an extent state there's no need to start the rbtree search from the root node - we can start it from the original extent state node, since we would end up in its subtree if we do the search starting at the root node anyway. Signed-off-by: Filipe David Borba Manana Signed-off-by: Josef Bacik --- fs/btrfs/extent_io.c | 13 ++++++++----- 1 file changed, 8 insertions(+), 5 deletions(-) diff --git a/fs/btrfs/extent_io.c b/fs/btrfs/extent_io.c index 2c9fbe3b6eec..fd78c84821c8 100644 --- a/fs/btrfs/extent_io.c +++ b/fs/btrfs/extent_io.c @@ -229,12 +229,14 @@ void free_extent_state(struct extent_state *state) } } -static struct rb_node *tree_insert(struct rb_root *root, u64 offset, +static struct rb_node *tree_insert(struct rb_root *root, + struct rb_node *search_start, + u64 offset, struct rb_node *node, struct rb_node ***p_in, struct rb_node **parent_in) { - struct rb_node **p = &root->rb_node; + struct rb_node **p; struct rb_node *parent = NULL; struct tree_entry *entry; @@ -244,6 +246,7 @@ static struct rb_node *tree_insert(struct rb_root *root, u64 offset, goto do_insert; } + p = search_start ? &search_start : &root->rb_node; while (*p) { parent = *p; entry = rb_entry(parent, struct tree_entry, rb_node); @@ -430,7 +433,7 @@ static int insert_state(struct extent_io_tree *tree, set_state_bits(tree, state, bits); - node = tree_insert(&tree->state, end, &state->rb_node, p, parent); + node = tree_insert(&tree->state, NULL, end, &state->rb_node, p, parent); if (node) { struct extent_state *found; found = rb_entry(node, struct extent_state, rb_node); @@ -477,8 +480,8 @@ static int split_state(struct extent_io_tree *tree, struct extent_state *orig, prealloc->state = orig->state; orig->start = split; - node = tree_insert(&tree->state, prealloc->end, &prealloc->rb_node, - NULL, NULL); + node = tree_insert(&tree->state, &orig->rb_node, prealloc->end, + &prealloc->rb_node, NULL, NULL); if (node) { free_extent_state(prealloc); return -EEXIST; -- 2.11.0