#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
-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;
-};
+/* 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 */
-/* 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;
- u64 end; /* inclusive */
- char *addr;
- struct page *pages[];
+struct extent_map_tree {
+ struct rb_root map;
+ spinlock_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);
-
-void extent_map_tree_init(struct extent_map_tree *tree,
- struct address_space *mapping, gfp_t mask);
+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, 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 extent_clean_all_trees(struct extent_map_tree *tree);
-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 set_extent_delalloc(struct extent_map_tree *tree, u64 start, u64 end,
- gfp_t mask);
-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);
+int __init extent_map_init(void);
+void extent_map_exit(void);
#endif