X-Git-Url: http://ftp.safe.ca/?a=blobdiff_plain;f=fs%2Fbtrfs%2Fextent_map.h;h=ab6d74b6e6477dcfb1bf65df494c5749cc8d80d9;hb=4434ade8c9334a3ab975d8993de456f06841899e;hp=f1dc28d260eb0b3d4404957f7404f1188b93d9d8;hpb=810191ff3087e8143b41a944fcf4fd8c693f00e3;p=safe%2Fjmp%2Flinux-2.6

diff --git a/fs/btrfs/extent_map.h b/fs/btrfs/extent_map.h
index f1dc28d..ab6d74b 100644
--- a/fs/btrfs/extent_map.h
+++ b/fs/btrfs/extent_map.h
@@ -3,189 +3,63 @@
 
 #include <linux/rbtree.h>
 
+#define EXTENT_MAP_LAST_BYTE (u64)-4
 #define EXTENT_MAP_HOLE (u64)-3
 #define EXTENT_MAP_INLINE (u64)-2
 #define EXTENT_MAP_DELALLOC (u64)-1
 
-/* bits for the extent state */
-#define EXTENT_DIRTY 1
-#define EXTENT_WRITEBACK (1 << 1)
-#define EXTENT_UPTODATE (1 << 2)
-#define EXTENT_LOCKED (1 << 3)
-#define EXTENT_NEW (1 << 4)
-#define EXTENT_DELALLOC (1 << 5)
-#define EXTENT_DEFRAG (1 << 6)
-#define EXTENT_DEFRAG_DONE (1 << 7)
-#define EXTENT_BUFFER_FILLED (1 << 8)
-#define EXTENT_IOBITS (EXTENT_LOCKED | EXTENT_WRITEBACK)
+/* bits for the flags field */
+#define EXTENT_FLAG_PINNED 0 /* this entry not yet on disk, don't free it */
+#define EXTENT_FLAG_COMPRESSED 1
+#define EXTENT_FLAG_VACANCY 2 /* no file extent item found */
+#define EXTENT_FLAG_PREALLOC 3 /* pre-allocated extent */
 
-
-struct extent_map_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);
-};
-
-struct extent_map_tree {
-	struct rb_root map;
-	struct rb_root state;
-	struct address_space *mapping;
-	rwlock_t lock;
-	struct extent_map_ops *ops;
-	spinlock_t lru_lock;
-	struct list_head buffer_lru;
-	int lru_size;
-};
-
-/* note, this must start with the same fields as fs/extent_map.c:tree_entry */
 struct extent_map {
-	u64 start;
-	u64 end; /* inclusive */
-	int in_tree;
 	struct rb_node rb_node;
-	/* block_start and block_end are in bytes */
+
+	/* all of these are in bytes */
+	u64 start;
+	u64 len;
+	u64 orig_start;
 	u64 block_start;
-	u64 block_end; /* inclusive */
+	u64 block_len;
+	unsigned long flags;
 	struct block_device *bdev;
 	atomic_t refs;
-};
-
-/* note, this must start with the same fields as fs/extent_map.c:tree_entry */
-struct extent_state {
-	u64 start;
-	u64 end; /* inclusive */
 	int in_tree;
-	struct rb_node rb_node;
-	wait_queue_head_t wq;
-	atomic_t refs;
-	unsigned long state;
-
-	/* for use by the FS */
-	u64 private;
-
-	struct list_head list;
 };
 
-struct extent_buffer {
-	u64 start;
-	unsigned long len;
-	char *map_token;
-	char *kaddr;
-	unsigned long map_start;
-	unsigned long map_len;
-	struct page *first_page;
-	struct list_head lru;
-	atomic_t refs;
-	int flags;
+struct extent_map_tree {
+	struct rb_root map;
+	rwlock_t lock;
 };
 
-typedef struct extent_map *(get_extent_t)(struct inode *inode,
-					  struct page *page,
-					  size_t page_offset,
-					  u64 start, u64 end,
-					  int create);
+static inline u64 extent_map_end(struct extent_map *em)
+{
+	if (em->start + em->len < em->start)
+		return (u64)-1;
+	return em->start + em->len;
+}
+
+static inline u64 extent_map_block_end(struct extent_map *em)
+{
+	if (em->block_start + em->block_len < em->block_start)
+		return (u64)-1;
+	return em->block_start + em->block_len;
+}
 
-void extent_map_tree_init(struct extent_map_tree *tree,
-			  struct address_space *mapping, gfp_t mask);
-void extent_map_tree_cleanup(struct extent_map_tree *tree);
+void extent_map_tree_init(struct extent_map_tree *tree, gfp_t mask);
 struct extent_map *lookup_extent_mapping(struct extent_map_tree *tree,
-					 u64 start, u64 end);
+					 u64 start, u64 len);
 int add_extent_mapping(struct extent_map_tree *tree,
 		       struct extent_map *em);
 int remove_extent_mapping(struct extent_map_tree *tree, struct extent_map *em);
-int try_release_extent_mapping(struct extent_map_tree *tree, struct page *page);
-int lock_extent(struct extent_map_tree *tree, u64 start, u64 end, gfp_t mask);
-int unlock_extent(struct extent_map_tree *tree, u64 start, u64 end, gfp_t mask);
+
 struct extent_map *alloc_extent_map(gfp_t mask);
 void free_extent_map(struct extent_map *em);
-int extent_read_full_page(struct extent_map_tree *tree, struct page *page,
-			  get_extent_t *get_extent);
-void __init extent_map_init(void);
-void __exit extent_map_exit(void);
-
-int test_range_bit(struct extent_map_tree *tree, u64 start, u64 end,
-		   int bits, int filled);
-int clear_extent_bits(struct extent_map_tree *tree, u64 start, u64 end,
-		      int bits, gfp_t mask);
-int set_extent_bits(struct extent_map_tree *tree, u64 start, u64 end,
-		    int bits, gfp_t mask);
-int set_extent_uptodate(struct extent_map_tree *tree, u64 start, u64 end,
-			gfp_t mask);
-int set_extent_new(struct extent_map_tree *tree, u64 start, u64 end,
-		   gfp_t mask);
-int set_extent_dirty(struct extent_map_tree *tree, u64 start, u64 end,
-		     gfp_t mask);
-int clear_extent_dirty(struct extent_map_tree *tree, u64 start, u64 end,
-		       gfp_t mask);
-int set_extent_delalloc(struct extent_map_tree *tree, u64 start, u64 end,
-		     gfp_t mask);
-int find_first_extent_bit(struct extent_map_tree *tree, u64 start,
-			  u64 *start_ret, u64 *end_ret, int bits);
-int extent_invalidatepage(struct extent_map_tree *tree,
-			  struct page *page, unsigned long offset);
-int extent_write_full_page(struct extent_map_tree *tree, struct page *page,
-			  get_extent_t *get_extent,
-			  struct writeback_control *wbc);
-int extent_prepare_write(struct extent_map_tree *tree,
-			 struct inode *inode, struct page *page,
-			 unsigned from, unsigned to, get_extent_t *get_extent);
-int extent_commit_write(struct extent_map_tree *tree,
-			struct inode *inode, struct page *page,
-			unsigned from, unsigned to);
-sector_t extent_bmap(struct address_space *mapping, sector_t iblock,
-		get_extent_t *get_extent);
-int set_range_dirty(struct extent_map_tree *tree, u64 start, u64 end);
-int set_state_private(struct extent_map_tree *tree, u64 start, u64 private);
-int get_state_private(struct extent_map_tree *tree, u64 start, u64 *private);
-void set_page_extent_mapped(struct page *page);
-
-struct extent_buffer *alloc_extent_buffer(struct extent_map_tree *tree,
-					  u64 start, unsigned long len,
-					  gfp_t mask);
-struct extent_buffer *find_extent_buffer(struct extent_map_tree *tree,
-					 u64 start, unsigned long len,
-					  gfp_t mask);
-void free_extent_buffer(struct extent_buffer *eb);
-int read_extent_buffer_pages(struct extent_map_tree *tree,
-			     struct extent_buffer *eb, int wait);
-
-static inline void extent_buffer_get(struct extent_buffer *eb)
-{
-	atomic_inc(&eb->refs);
-}
-
-int memcmp_extent_buffer(struct extent_buffer *eb, const void *ptrv,
-			  unsigned long start,
-			  unsigned long len);
-void read_extent_buffer(struct extent_buffer *eb, void *dst,
-			unsigned long start,
-			unsigned long len);
-void write_extent_buffer(struct extent_buffer *eb, const void *src,
-			 unsigned long start, unsigned long len);
-void copy_extent_buffer(struct extent_buffer *dst, struct extent_buffer *src,
-			unsigned long dst_offset, unsigned long src_offset,
-			unsigned long len);
-void memcpy_extent_buffer(struct extent_buffer *dst, unsigned long dst_offset,
-			   unsigned long src_offset, unsigned long len);
-void memmove_extent_buffer(struct extent_buffer *dst, unsigned long dst_offset,
-			   unsigned long src_offset, unsigned long len);
-void memset_extent_buffer(struct extent_buffer *eb, char c,
-			  unsigned long start, unsigned long len);
-int wait_on_extent_buffer_writeback(struct extent_map_tree *tree,
-				    struct extent_buffer *eb);
-int clear_extent_buffer_dirty(struct extent_map_tree *tree,
-			      struct extent_buffer *eb);
-int set_extent_buffer_dirty(struct extent_map_tree *tree,
-			     struct extent_buffer *eb);
-int set_extent_buffer_uptodate(struct extent_map_tree *tree,
-			       struct extent_buffer *eb);
-int extent_buffer_uptodate(struct extent_map_tree *tree,
-			   struct extent_buffer *eb);
-int map_extent_buffer(struct extent_buffer *eb, unsigned long offset,
-		      unsigned long min_len, char **token, char **map,
-		      unsigned long *map_start,
-		      unsigned long *map_len, int km);
-void unmap_extent_buffer(struct extent_buffer *eb, char *token, int km);
+int __init extent_map_init(void);
+void extent_map_exit(void);
+int unpin_extent_cache(struct extent_map_tree *tree, u64 start, u64 len);
+struct extent_map *search_extent_mapping(struct extent_map_tree *tree,
+					 u64 start, u64 len);
 #endif