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-rw-r--r--fs/btrfs/extent_io.c76
1 files changed, 55 insertions, 21 deletions
diff --git a/fs/btrfs/extent_io.c b/fs/btrfs/extent_io.c
index 01a141245862..5fc9481515f3 100644
--- a/fs/btrfs/extent_io.c
+++ b/fs/btrfs/extent_io.c
@@ -224,12 +224,20 @@ void free_extent_state(struct extent_state *state)
}
static struct rb_node *tree_insert(struct rb_root *root, u64 offset,
- struct rb_node *node)
+ struct rb_node *node,
+ struct rb_node ***p_in,
+ struct rb_node **parent_in)
{
struct rb_node **p = &root->rb_node;
struct rb_node *parent = NULL;
struct tree_entry *entry;
+ if (p_in && parent_in) {
+ p = *p_in;
+ parent = *parent_in;
+ goto do_insert;
+ }
+
while (*p) {
parent = *p;
entry = rb_entry(parent, struct tree_entry, rb_node);
@@ -242,35 +250,43 @@ static struct rb_node *tree_insert(struct rb_root *root, u64 offset,
return parent;
}
+do_insert:
rb_link_node(node, parent, p);
rb_insert_color(node, root);
return NULL;
}
static struct rb_node *__etree_search(struct extent_io_tree *tree, u64 offset,
- struct rb_node **prev_ret,
- struct rb_node **next_ret)
+ struct rb_node **prev_ret,
+ struct rb_node **next_ret,
+ struct rb_node ***p_ret,
+ struct rb_node **parent_ret)
{
struct rb_root *root = &tree->state;
- struct rb_node *n = root->rb_node;
+ struct rb_node **n = &root->rb_node;
struct rb_node *prev = NULL;
struct rb_node *orig_prev = NULL;
struct tree_entry *entry;
struct tree_entry *prev_entry = NULL;
- while (n) {
- entry = rb_entry(n, struct tree_entry, rb_node);
- prev = n;
+ while (*n) {
+ prev = *n;
+ entry = rb_entry(prev, struct tree_entry, rb_node);
prev_entry = entry;
if (offset < entry->start)
- n = n->rb_left;
+ n = &(*n)->rb_left;
else if (offset > entry->end)
- n = n->rb_right;
+ n = &(*n)->rb_right;
else
- return n;
+ return *n;
}
+ if (p_ret)
+ *p_ret = n;
+ if (parent_ret)
+ *parent_ret = prev;
+
if (prev_ret) {
orig_prev = prev;
while (prev && offset > prev_entry->end) {
@@ -292,18 +308,27 @@ static struct rb_node *__etree_search(struct extent_io_tree *tree, u64 offset,
return NULL;
}
-static inline struct rb_node *tree_search(struct extent_io_tree *tree,
- u64 offset)
+static inline struct rb_node *
+tree_search_for_insert(struct extent_io_tree *tree,
+ u64 offset,
+ struct rb_node ***p_ret,
+ struct rb_node **parent_ret)
{
struct rb_node *prev = NULL;
struct rb_node *ret;
- ret = __etree_search(tree, offset, &prev, NULL);
+ ret = __etree_search(tree, offset, &prev, NULL, p_ret, parent_ret);
if (!ret)
return prev;
return ret;
}
+static inline struct rb_node *tree_search(struct extent_io_tree *tree,
+ u64 offset)
+{
+ return tree_search_for_insert(tree, offset, NULL, NULL);
+}
+
static void merge_cb(struct extent_io_tree *tree, struct extent_state *new,
struct extent_state *other)
{
@@ -385,6 +410,8 @@ static void set_state_bits(struct extent_io_tree *tree,
*/
static int insert_state(struct extent_io_tree *tree,
struct extent_state *state, u64 start, u64 end,
+ struct rb_node ***p,
+ struct rb_node **parent,
unsigned long *bits)
{
struct rb_node *node;
@@ -397,7 +424,7 @@ static int insert_state(struct extent_io_tree *tree,
set_state_bits(tree, state, bits);
- node = tree_insert(&tree->state, end, &state->rb_node);
+ node = tree_insert(&tree->state, end, &state->rb_node, p, parent);
if (node) {
struct extent_state *found;
found = rb_entry(node, struct extent_state, rb_node);
@@ -444,7 +471,8 @@ 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);
+ node = tree_insert(&tree->state, prealloc->end, &prealloc->rb_node,
+ NULL, NULL);
if (node) {
free_extent_state(prealloc);
return -EEXIST;
@@ -783,6 +811,8 @@ __set_extent_bit(struct extent_io_tree *tree, u64 start, u64 end,
struct extent_state *state;
struct extent_state *prealloc = NULL;
struct rb_node *node;
+ struct rb_node **p;
+ struct rb_node *parent;
int err = 0;
u64 last_start;
u64 last_end;
@@ -809,11 +839,12 @@ again:
* this search will find all the extents that end after
* our range starts.
*/
- node = tree_search(tree, start);
+ node = tree_search_for_insert(tree, start, &p, &parent);
if (!node) {
prealloc = alloc_extent_state_atomic(prealloc);
BUG_ON(!prealloc);
- err = insert_state(tree, prealloc, start, end, &bits);
+ err = insert_state(tree, prealloc, start, end,
+ &p, &parent, &bits);
if (err)
extent_io_tree_panic(tree, err);
@@ -920,7 +951,7 @@ hit_next:
* the later extent.
*/
err = insert_state(tree, prealloc, start, this_end,
- &bits);
+ NULL, NULL, &bits);
if (err)
extent_io_tree_panic(tree, err);
@@ -1006,6 +1037,8 @@ int convert_extent_bit(struct extent_io_tree *tree, u64 start, u64 end,
struct extent_state *state;
struct extent_state *prealloc = NULL;
struct rb_node *node;
+ struct rb_node **p;
+ struct rb_node *parent;
int err = 0;
u64 last_start;
u64 last_end;
@@ -1033,14 +1066,15 @@ again:
* this search will find all the extents that end after
* our range starts.
*/
- node = tree_search(tree, start);
+ node = tree_search_for_insert(tree, start, &p, &parent);
if (!node) {
prealloc = alloc_extent_state_atomic(prealloc);
if (!prealloc) {
err = -ENOMEM;
goto out;
}
- err = insert_state(tree, prealloc, start, end, &bits);
+ err = insert_state(tree, prealloc, start, end,
+ &p, &parent, &bits);
if (err)
extent_io_tree_panic(tree, err);
cache_state(prealloc, cached_state);
@@ -1137,7 +1171,7 @@ hit_next:
* the later extent.
*/
err = insert_state(tree, prealloc, start, this_end,
- &bits);
+ NULL, NULL, &bits);
if (err)
extent_io_tree_panic(tree, err);
cache_state(prealloc, cached_state);
generated by cgit v1.2.3 (git 2.0.4) at 2024-11-18 22:26:11 +0000