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| author | Chris Mason <chris.mason@oracle.com> | 2008-01-29 14:59:12 (GMT) |
|---|---|---|
| committer | Chris Mason <chris.mason@oracle.com> | 2008-09-25 15:03:59 (GMT) |
| commit | 70dec8079d78691e476cc6c7cede40656078ad30 (patch) | |
| tree | 19ab80f247fc026c3f5a5713381e98372737227b /fs/btrfs/extent_io.h | |
| parent | aadfeb6e39ad6bde080cb3ab23f4da57ccb25f4a (diff) | |
| download | linux-70dec8079d78691e476cc6c7cede40656078ad30.tar.xz | |
Btrfs: extent_io and extent_state optimizations
The end_bio routines are changed to take a pointer to the extent state
struct, and the state tree is walked in order to set/clear appropriate
bits as IO completes. This greatly reduces the number of rbtree searches
done by the end_bio handlers, and reduces lock contention.
The extent_io releasepage function is changed to avoid expensive searches
for locked state.
Signed-off-by: Chris Mason <chris.mason@oracle.com>
Diffstat (limited to 'fs/btrfs/extent_io.h')
| -rw-r--r-- | fs/btrfs/extent_io.h | 15 |
1 files changed, 10 insertions, 5 deletions
diff --git a/fs/btrfs/extent_io.h b/fs/btrfs/extent_io.h index 06be1fe..f1e8bf2 100644 --- a/fs/btrfs/extent_io.h +++ b/fs/btrfs/extent_io.h @@ -23,19 +23,23 @@ #define EXTENT_PAGE_PRIVATE 1 #define EXTENT_PAGE_PRIVATE_FIRST_PAGE 3 +struct extent_state; + struct extent_io_ops { int (*fill_delalloc)(struct inode *inode, u64 start, u64 end); int (*writepage_io_hook)(struct page *page, u64 start, u64 end); int (*readpage_io_hook)(struct page *page, u64 start, u64 end); - int (*readpage_end_io_hook)(struct page *page, u64 start, u64 end); - void (*writepage_end_io_hook)(struct page *page, u64 start, u64 end); + int (*readpage_end_io_hook)(struct page *page, u64 start, u64 end, + struct extent_state *state); + void (*writepage_end_io_hook)(struct page *page, u64 start, u64 end, + struct extent_state *state); }; struct extent_io_tree { struct rb_root state; struct address_space *mapping; u64 dirty_bytes; - rwlock_t lock; + spinlock_t lock; struct extent_io_ops *ops; spinlock_t lru_lock; struct list_head buffer_lru; @@ -45,8 +49,8 @@ struct extent_io_tree { struct extent_state { u64 start; u64 end; /* inclusive */ - int in_tree; struct rb_node rb_node; + struct extent_io_tree *tree; wait_queue_head_t wq; atomic_t refs; unsigned long state; @@ -82,7 +86,8 @@ 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); + struct extent_io_tree *tree, struct page *page, + gfp_t mask); int lock_extent(struct extent_io_tree *tree, u64 start, u64 end, gfp_t mask); int unlock_extent(struct extent_io_tree *tree, u64 start, u64 end, gfp_t mask); int extent_read_full_page(struct extent_io_tree *tree, struct page *page, |