2ecec0d6a5
The helper extent_map_block_end() is currently not used anywhere outside extent_map.c, so move into from extent_map.h into extent_map.c. While at it, also make the extent map pointer argument as const. Reviewed-by: Josef Bacik <josef@toxicpanda.com> Signed-off-by: Filipe Manana <fdmanana@suse.com> Reviewed-by: David Sterba <dsterba@suse.com> Signed-off-by: David Sterba <dsterba@suse.com>
108 lines
3.0 KiB
C
108 lines
3.0 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
|
|
|
|
#ifndef BTRFS_EXTENT_MAP_H
|
|
#define BTRFS_EXTENT_MAP_H
|
|
|
|
#include <linux/rbtree.h>
|
|
#include <linux/refcount.h>
|
|
|
|
#define EXTENT_MAP_LAST_BYTE ((u64)-4)
|
|
#define EXTENT_MAP_HOLE ((u64)-3)
|
|
#define EXTENT_MAP_INLINE ((u64)-2)
|
|
/* used only during fiemap calls */
|
|
#define EXTENT_MAP_DELALLOC ((u64)-1)
|
|
|
|
/* bits for the extent_map::flags field */
|
|
enum {
|
|
/* this entry not yet on disk, don't free it */
|
|
EXTENT_FLAG_PINNED,
|
|
EXTENT_FLAG_COMPRESSED,
|
|
/* pre-allocated extent */
|
|
EXTENT_FLAG_PREALLOC,
|
|
/* Logging this extent */
|
|
EXTENT_FLAG_LOGGING,
|
|
/* Filling in a preallocated extent */
|
|
EXTENT_FLAG_FILLING,
|
|
/* filesystem extent mapping type */
|
|
EXTENT_FLAG_FS_MAPPING,
|
|
/* This em is merged from two or more physically adjacent ems */
|
|
EXTENT_FLAG_MERGED,
|
|
};
|
|
|
|
struct extent_map {
|
|
struct rb_node rb_node;
|
|
|
|
/* all of these are in bytes */
|
|
u64 start;
|
|
u64 len;
|
|
u64 mod_start;
|
|
u64 mod_len;
|
|
u64 orig_start;
|
|
u64 orig_block_len;
|
|
u64 ram_bytes;
|
|
u64 block_start;
|
|
u64 block_len;
|
|
|
|
/*
|
|
* Generation of the extent map, for merged em it's the highest
|
|
* generation of all merged ems.
|
|
* For non-merged extents, it's from btrfs_file_extent_item::generation.
|
|
*/
|
|
u64 generation;
|
|
unsigned long flags;
|
|
/* Used for chunk mappings, flag EXTENT_FLAG_FS_MAPPING must be set */
|
|
struct map_lookup *map_lookup;
|
|
refcount_t refs;
|
|
unsigned int compress_type;
|
|
struct list_head list;
|
|
};
|
|
|
|
struct extent_map_tree {
|
|
struct rb_root_cached map;
|
|
struct list_head modified_extents;
|
|
rwlock_t lock;
|
|
};
|
|
|
|
struct btrfs_inode;
|
|
|
|
static inline int extent_map_in_tree(const struct extent_map *em)
|
|
{
|
|
return !RB_EMPTY_NODE(&em->rb_node);
|
|
}
|
|
|
|
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;
|
|
}
|
|
|
|
void extent_map_tree_init(struct extent_map_tree *tree);
|
|
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 modified);
|
|
void remove_extent_mapping(struct extent_map_tree *tree, struct extent_map *em);
|
|
int split_extent_map(struct btrfs_inode *inode, u64 start, u64 len, u64 pre,
|
|
u64 new_logical);
|
|
|
|
struct extent_map *alloc_extent_map(void);
|
|
void free_extent_map(struct extent_map *em);
|
|
int __init extent_map_init(void);
|
|
void __cold extent_map_exit(void);
|
|
int unpin_extent_cache(struct extent_map_tree *tree, u64 start, u64 len, u64 gen);
|
|
void clear_em_logging(struct extent_map_tree *tree, struct extent_map *em);
|
|
struct extent_map *search_extent_mapping(struct extent_map_tree *tree,
|
|
u64 start, u64 len);
|
|
int btrfs_add_extent_mapping(struct btrfs_fs_info *fs_info,
|
|
struct extent_map_tree *em_tree,
|
|
struct extent_map **em_in, u64 start, u64 len);
|
|
void btrfs_drop_extent_map_range(struct btrfs_inode *inode,
|
|
u64 start, u64 end,
|
|
bool skip_pinned);
|
|
int btrfs_replace_extent_map_range(struct btrfs_inode *inode,
|
|
struct extent_map *new_em,
|
|
bool modified);
|
|
|
|
#endif
|