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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 */
Josef Bacikff44c6e2012-09-14 12:59:20 -040016#define EXTENT_FLAG_LOGGING 4 /* Logging this extent */
Josef Bacikb11e2342012-12-03 10:58:15 -050017#define EXTENT_FLAG_FILLING 5 /* Filling in a preallocated extent */
Chris Mason7f3c74f2008-07-18 12:01:11 -040018
Chris Masond1310b22008-01-24 16:13:08 -050019struct extent_map {
20 struct rb_node rb_node;
Chris Mason5f39d392007-10-15 16:14:19 -040021
Chris Masond1310b22008-01-24 16:13:08 -050022 /* all of these are in bytes */
23 u64 start;
24 u64 len;
Liu Bo4e2f84e2012-08-27 10:52:20 -060025 u64 mod_start;
26 u64 mod_len;
Yan Zhengff5b7ee2008-11-10 07:34:43 -050027 u64 orig_start;
Josef Bacikb4939682012-12-03 10:31:19 -050028 u64 orig_block_len;
Chris Masond1310b22008-01-24 16:13:08 -050029 u64 block_start;
Chris Masonc8b97812008-10-29 14:49:59 -040030 u64 block_len;
Josef Bacik5dc562c2012-08-17 13:14:17 -040031 u64 generation;
Chris Masond1310b22008-01-24 16:13:08 -050032 unsigned long flags;
33 struct block_device *bdev;
34 atomic_t refs;
David Sterbac08782d2012-01-26 15:01:12 -050035 unsigned int in_tree;
36 unsigned int compress_type;
Josef Bacik5dc562c2012-08-17 13:14:17 -040037 struct list_head list;
Chris Mason07157aa2007-08-30 08:50:51 -040038};
39
Chris Masona52d9a82007-08-27 16:49:44 -040040struct extent_map_tree {
41 struct rb_root map;
Josef Bacik5dc562c2012-08-17 13:14:17 -040042 struct list_head modified_extents;
Chris Mason890871b2009-09-02 16:24:52 -040043 rwlock_t lock;
Chris Masona52d9a82007-08-27 16:49:44 -040044};
45
Chris Masond1310b22008-01-24 16:13:08 -050046static inline u64 extent_map_end(struct extent_map *em)
47{
48 if (em->start + em->len < em->start)
49 return (u64)-1;
50 return em->start + em->len;
51}
Chris Masona52d9a82007-08-27 16:49:44 -040052
Chris Masond1310b22008-01-24 16:13:08 -050053static inline u64 extent_map_block_end(struct extent_map *em)
54{
Chris Masonc8b97812008-10-29 14:49:59 -040055 if (em->block_start + em->block_len < em->block_start)
Chris Masond1310b22008-01-24 16:13:08 -050056 return (u64)-1;
Chris Masonc8b97812008-10-29 14:49:59 -040057 return em->block_start + em->block_len;
Chris Masond1310b22008-01-24 16:13:08 -050058}
Chris Mason07157aa2007-08-30 08:50:51 -040059
David Sterbaa8067e02011-04-21 00:34:43 +020060void extent_map_tree_init(struct extent_map_tree *tree);
Chris Masona52d9a82007-08-27 16:49:44 -040061struct extent_map *lookup_extent_mapping(struct extent_map_tree *tree,
Chris Masond1310b22008-01-24 16:13:08 -050062 u64 start, u64 len);
Chris Masona52d9a82007-08-27 16:49:44 -040063int add_extent_mapping(struct extent_map_tree *tree,
64 struct extent_map *em);
65int remove_extent_mapping(struct extent_map_tree *tree, struct extent_map *em);
Chris Masond1310b22008-01-24 16:13:08 -050066
David Sterba172ddd62011-04-21 00:48:27 +020067struct extent_map *alloc_extent_map(void);
Chris Masona52d9a82007-08-27 16:49:44 -040068void free_extent_map(struct extent_map *em);
Wyatt Banks2f4cbe62007-11-19 10:22:33 -050069int __init extent_map_init(void);
Christian Hesse17636e02007-12-11 09:25:06 -050070void extent_map_exit(void);
Josef Bacik5dc562c2012-08-17 13:14:17 -040071int unpin_extent_cache(struct extent_map_tree *tree, u64 start, u64 len, u64 gen);
Josef Bacik201a9032013-01-24 12:02:07 -050072void clear_em_logging(struct extent_map_tree *tree, struct extent_map *em);
Chris Masonb917b7c2009-09-18 16:07:03 -040073struct extent_map *search_extent_mapping(struct extent_map_tree *tree,
74 u64 start, u64 len);
Chris Masona52d9a82007-08-27 16:49:44 -040075#endif