diff options
Diffstat (limited to 'fs/btrfs/extent_map.h')
-rw-r--r-- | fs/btrfs/extent_map.h | 77 |
1 files changed, 52 insertions, 25 deletions
diff --git a/fs/btrfs/extent_map.h b/fs/btrfs/extent_map.h index 35d27c756e08..e380fc08bbe4 100644 --- a/fs/btrfs/extent_map.h +++ b/fs/btrfs/extent_map.h @@ -5,30 +5,33 @@ #include <linux/rbtree.h> #include <linux/refcount.h> +#include "compression.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, + ENUM_BIT(EXTENT_FLAG_PINNED), + ENUM_BIT(EXTENT_FLAG_COMPRESS_ZLIB), + ENUM_BIT(EXTENT_FLAG_COMPRESS_LZO), + ENUM_BIT(EXTENT_FLAG_COMPRESS_ZSTD), /* pre-allocated extent */ - EXTENT_FLAG_PREALLOC, + ENUM_BIT(EXTENT_FLAG_PREALLOC), /* Logging this extent */ - EXTENT_FLAG_LOGGING, + ENUM_BIT(EXTENT_FLAG_LOGGING), /* Filling in a preallocated extent */ - EXTENT_FLAG_FILLING, - /* filesystem extent mapping type */ - EXTENT_FLAG_FS_MAPPING, + ENUM_BIT(EXTENT_FLAG_FILLING), /* This em is merged from two or more physically adjacent ems */ - EXTENT_FLAG_MERGED, + ENUM_BIT(EXTENT_FLAG_MERGED), }; +/* + * Keep this structure as compact as possible, as we can have really large + * amounts of allocated extent maps at any time. + */ struct extent_map { struct rb_node rb_node; @@ -49,11 +52,8 @@ struct extent_map { * 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; + u32 flags; refcount_t refs; - unsigned int compress_type; struct list_head list; }; @@ -65,30 +65,57 @@ struct extent_map_tree { struct btrfs_inode; +static inline void extent_map_set_compression(struct extent_map *em, + enum btrfs_compression_type type) +{ + if (type == BTRFS_COMPRESS_ZLIB) + em->flags |= EXTENT_FLAG_COMPRESS_ZLIB; + else if (type == BTRFS_COMPRESS_LZO) + em->flags |= EXTENT_FLAG_COMPRESS_LZO; + else if (type == BTRFS_COMPRESS_ZSTD) + em->flags |= EXTENT_FLAG_COMPRESS_ZSTD; +} + +static inline enum btrfs_compression_type extent_map_compression(const struct extent_map *em) +{ + if (em->flags & EXTENT_FLAG_COMPRESS_ZLIB) + return BTRFS_COMPRESS_ZLIB; + + if (em->flags & EXTENT_FLAG_COMPRESS_LZO) + return BTRFS_COMPRESS_LZO; + + if (em->flags & EXTENT_FLAG_COMPRESS_ZSTD) + return BTRFS_COMPRESS_ZSTD; + + return BTRFS_COMPRESS_NONE; +} + +/* + * More efficient way to determine if extent is compressed, instead of using + * 'extent_map_compression() != BTRFS_COMPRESS_NONE'. + */ +static inline bool extent_map_is_compressed(const struct extent_map *em) +{ + return (em->flags & (EXTENT_FLAG_COMPRESS_ZLIB | + EXTENT_FLAG_COMPRESS_LZO | + EXTENT_FLAG_COMPRESS_ZSTD)) != 0; +} + 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) +static inline u64 extent_map_end(const 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); 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); @@ -97,7 +124,7 @@ 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); +int unpin_extent_cache(struct btrfs_inode *inode, 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); |