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authorChris Mason <chris.mason@oracle.com>2008-02-18 12:12:38 -0500
committerChris Mason <chris.mason@oracle.com>2008-09-25 11:04:00 -0400
commitd7fc640e6fed46932f7c74e14f9b58b8637c66cf (patch)
tree525eda21f9e0d6d18bd55fd23d3a31814b224aa8 /fs/btrfs/extent_io.h
parent9afbb0b752ef30a429c45b9de6706e28ad1a36e1 (diff)
Btrfs: Allocator improvements
Reduce CPU time searching for free blocks by optimizing find_first_extent_bit Fix find_free_extent to make better use of the last_alloc hint. Before it was often finding blocks just before the hint. Signed-off-by: Chris Mason <chris.mason@oracle.com>
Diffstat (limited to 'fs/btrfs/extent_io.h')
-rw-r--r--fs/btrfs/extent_io.h11
1 files changed, 11 insertions, 0 deletions
diff --git a/fs/btrfs/extent_io.h b/fs/btrfs/extent_io.h
index 151fdada4dc..fcc4bb078c2 100644
--- a/fs/btrfs/extent_io.h
+++ b/fs/btrfs/extent_io.h
@@ -81,6 +81,15 @@ struct extent_buffer {
struct extent_map_tree;
+static inline struct extent_state *extent_state_next(struct extent_state *state)
+{
+ struct rb_node *node;
+ node = rb_next(&state->rb_node);
+ if (!node)
+ return NULL;
+ return rb_entry(node, struct extent_state, rb_node);
+}
+
typedef struct extent_map *(get_extent_t)(struct inode *inode,
struct page *page,
size_t page_offset,
@@ -122,6 +131,8 @@ int set_extent_delalloc(struct extent_io_tree *tree, u64 start, u64 end,
gfp_t mask);
int find_first_extent_bit(struct extent_io_tree *tree, u64 start,
u64 *start_ret, u64 *end_ret, int bits);
+struct extent_state *find_first_extent_bit_state(struct extent_io_tree *tree,
+ u64 start, int bits);
int extent_invalidatepage(struct extent_io_tree *tree,
struct page *page, unsigned long offset);
int extent_write_full_page(struct extent_io_tree *tree, struct page *page,