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Btrfs: Index extent buffers in an rbtree

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Before, extent buffers were a temporary object, meant to map a number of pages
at once and collect operations on them.

But, a few extra fields have crept in, and they are also the best place to
store a per-tree block lock field as well.  This commit puts the extent
buffers into an rbtree, and ensures a single extent buffer for each
tree block.

Signed-off-by: Chris Mason <chris.mason@oracle.com>
This commit is contained in:
Chris Mason
2008-07-22 11:18:07 -04:00
parent 4a09675279
commit 6af118ce51
4 changed files with 129 additions and 220 deletions
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11
fs/btrfs/extent_io.h
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@@ -54,13 +54,12 @@ struct extent_io_ops {
struct extent_io_tree {
struct rb_root state;
struct rb_root buffer;
struct address_space *mapping;
u64 dirty_bytes;
spinlock_t lock;
spinlock_t buffer_lock;
struct extent_io_ops *ops;
spinlock_t lru_lock;
struct list_head buffer_lru;
int lru_size;
struct extent_state *last;
};
@@ -87,10 +86,10 @@ struct extent_buffer {
unsigned long map_start;
unsigned long map_len;
struct page *first_page;
struct list_head lru;
atomic_t refs;
int flags;
struct list_head leak_list;
struct rb_node rb_node;
};
struct extent_map_tree;
@@ -112,10 +111,10 @@ typedef struct extent_map *(get_extent_t)(struct inode *inode,
void extent_io_tree_init(struct extent_io_tree *tree,
struct address_space *mapping, gfp_t mask);
void extent_io_tree_empty_lru(struct extent_io_tree *tree);
int try_release_extent_mapping(struct extent_map_tree *map,
struct extent_io_tree *tree, struct page *page,
gfp_t mask);
int try_release_extent_buffer(struct extent_io_tree *tree, struct page *page);
int try_release_extent_state(struct extent_map_tree *map,
struct extent_io_tree *tree, struct page *page,
gfp_t mask);
@@ -241,8 +240,6 @@ int map_private_extent_buffer(struct extent_buffer *eb, unsigned long offset,
unsigned long *map_start,
unsigned long *map_len, int km);
void unmap_extent_buffer(struct extent_buffer *eb, char *token, int km);
int invalidate_extent_lru(struct extent_io_tree *tree, u64 start,
unsigned long len);
int release_extent_buffer_tail_pages(struct extent_buffer *eb);
int extent_range_uptodate(struct extent_io_tree *tree,
u64 start, u64 end);