blob: 33a7890b1f4091479df52d7a13c1532ba911ce76 [file] [log] [blame]
Chris Masona52d9a82007-08-27 16:49:44 -04001#ifndef __EXTENTMAP__
2#define __EXTENTMAP__
3
4#include <linux/rbtree.h>
5
Chris Masond1310b22008-01-24 16:13:08 -05006#define EXTENT_MAP_LAST_BYTE (u64)-4
Chris Mason5f39d392007-10-15 16:14:19 -04007#define EXTENT_MAP_HOLE (u64)-3
Chris Masona52d9a82007-08-27 16:49:44 -04008#define EXTENT_MAP_INLINE (u64)-2
9#define EXTENT_MAP_DELALLOC (u64)-1
10
Chris Mason7f3c74f2008-07-18 12:01:11 -040011/* bits for the flags field */
12#define EXTENT_FLAG_PINNED 0 /* this entry not yet on disk, don't free it */
Chris Masonc8b97812008-10-29 14:49:59 -040013#define EXTENT_FLAG_COMPRESSED 1
Yan Zheng9036c102008-10-30 14:19:41 -040014#define EXTENT_FLAG_VACANCY 2 /* no file extent item found */
Yan Zhengd899e052008-10-30 14:25:28 -040015#define EXTENT_FLAG_PREALLOC 3 /* pre-allocated extent */
Chris Mason7f3c74f2008-07-18 12:01:11 -040016
Chris Masond1310b22008-01-24 16:13:08 -050017struct extent_map {
18 struct rb_node rb_node;
Chris Mason5f39d392007-10-15 16:14:19 -040019
Chris Masond1310b22008-01-24 16:13:08 -050020 /* all of these are in bytes */
21 u64 start;
22 u64 len;
Yan Zhengff5b7ee2008-11-10 07:34:43 -050023 u64 orig_start;
Chris Masond1310b22008-01-24 16:13:08 -050024 u64 block_start;
Chris Masonc8b97812008-10-29 14:49:59 -040025 u64 block_len;
Chris Masond1310b22008-01-24 16:13:08 -050026 unsigned long flags;
27 struct block_device *bdev;
28 atomic_t refs;
Li Zefan261507a02010-12-17 14:21:50 +080029 unsigned int in_tree:1;
30 unsigned int compress_type:4;
Chris Mason07157aa2007-08-30 08:50:51 -040031};
32
Chris Masona52d9a82007-08-27 16:49:44 -040033struct extent_map_tree {
34 struct rb_root map;
Chris Mason890871b2009-09-02 16:24:52 -040035 rwlock_t lock;
Chris Masona52d9a82007-08-27 16:49:44 -040036};
37
Chris Masond1310b22008-01-24 16:13:08 -050038static inline u64 extent_map_end(struct extent_map *em)
39{
40 if (em->start + em->len < em->start)
41 return (u64)-1;
42 return em->start + em->len;
43}
Chris Masona52d9a82007-08-27 16:49:44 -040044
Chris Masond1310b22008-01-24 16:13:08 -050045static inline u64 extent_map_block_end(struct extent_map *em)
46{
Chris Masonc8b97812008-10-29 14:49:59 -040047 if (em->block_start + em->block_len < em->block_start)
Chris Masond1310b22008-01-24 16:13:08 -050048 return (u64)-1;
Chris Masonc8b97812008-10-29 14:49:59 -040049 return em->block_start + em->block_len;
Chris Masond1310b22008-01-24 16:13:08 -050050}
Chris Mason07157aa2007-08-30 08:50:51 -040051
David Sterbaa8067e02011-04-21 00:34:43 +020052void extent_map_tree_init(struct extent_map_tree *tree);
Chris Masona52d9a82007-08-27 16:49:44 -040053struct extent_map *lookup_extent_mapping(struct extent_map_tree *tree,
Chris Masond1310b22008-01-24 16:13:08 -050054 u64 start, u64 len);
Chris Masona52d9a82007-08-27 16:49:44 -040055int add_extent_mapping(struct extent_map_tree *tree,
56 struct extent_map *em);
57int remove_extent_mapping(struct extent_map_tree *tree, struct extent_map *em);
Chris Masond1310b22008-01-24 16:13:08 -050058
David Sterba172ddd62011-04-21 00:48:27 +020059struct extent_map *alloc_extent_map(void);
Chris Masona52d9a82007-08-27 16:49:44 -040060void free_extent_map(struct extent_map *em);
Wyatt Banks2f4cbe62007-11-19 10:22:33 -050061int __init extent_map_init(void);
Christian Hesse17636e02007-12-11 09:25:06 -050062void extent_map_exit(void);
Chris Masona1ed8352009-09-11 12:27:37 -040063int unpin_extent_cache(struct extent_map_tree *tree, u64 start, u64 len);
Chris Masonb917b7c2009-09-18 16:07:03 -040064struct extent_map *search_extent_mapping(struct extent_map_tree *tree,
65 u64 start, u64 len);
Chris Masona52d9a82007-08-27 16:49:44 -040066#endif