diff options
| author | merge <null@invalid> | 2009-01-22 13:55:32 +0000 |
|---|---|---|
| committer | Andy Green <agreen@octopus.localdomain> | 2009-01-22 13:55:32 +0000 |
| commit | aa6f5ffbdba45aa8e19e5048648fc6c7b25376d3 (patch) | |
| tree | fbb786d0ac6f8a774fd834e9ce951197e60fbffa /fs/btrfs/extent_map.h | |
| parent | f2d78193eae5dccd3d588d2c8ea0866efc368332 (diff) | |
MERGE-via-pending-tracking-hist-MERGE-via-stable-tracking-MERGE-via-mokopatches-tracking-fix-stray-endmenu-patch-1232632040-1232632141
pending-tracking-hist top was MERGE-via-stable-tracking-MERGE-via-mokopatches-tracking-fix-stray-endmenu-patch-1232632040-1232632141 / fdf777a63bcb59e0dfd78bfe2c6242e01f6d4eb9 ... parent commitmessage:
From: merge <null@invalid>
MERGE-via-stable-tracking-hist-MERGE-via-mokopatches-tracking-fix-stray-endmenu-patch-1232632040
stable-tracking-hist top was MERGE-via-mokopatches-tracking-fix-stray-endmenu-patch-1232632040 / 90463bfd2d5a3c8b52f6e6d71024a00e052b0ced ... parent commitmessage:
From: merge <null@invalid>
MERGE-via-mokopatches-tracking-hist-fix-stray-endmenu-patch
mokopatches-tracking-hist top was fix-stray-endmenu-patch / 3630e0be570de8057e7f8d2fe501ed353cdf34e6 ... parent commitmessage:
From: Andy Green <andy@openmoko.com>
fix-stray-endmenu.patch
Signed-off-by: Andy Green <andy@openmoko.com>
Diffstat (limited to 'fs/btrfs/extent_map.h')
| -rw-r--r-- | fs/btrfs/extent_map.h | 62 |
1 files changed, 62 insertions, 0 deletions
diff --git a/fs/btrfs/extent_map.h b/fs/btrfs/extent_map.h new file mode 100644 index 00000000000..fb6eeef06bb --- /dev/null +++ b/fs/btrfs/extent_map.h @@ -0,0 +1,62 @@ +#ifndef __EXTENTMAP__ +#define __EXTENTMAP__ + +#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 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 { + struct rb_node rb_node; + + /* all of these are in bytes */ + u64 start; + u64 len; + u64 orig_start; + u64 block_start; + u64 block_len; + unsigned long flags; + struct block_device *bdev; + atomic_t refs; + int in_tree; +}; + +struct extent_map_tree { + struct rb_root map; + spinlock_t lock; +}; + +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 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); + +struct extent_map *alloc_extent_map(gfp_t mask); +void free_extent_map(struct extent_map *em); +int __init extent_map_init(void); +void extent_map_exit(void); +#endif |