X-Git-Url: http://review.tizen.org/git/?a=blobdiff_plain;f=extent_io.h;h=d407d93d617e983eea0475297bedcdbeb81f558b;hb=e181c03d420ef36c8bedd86492dc5c7b229be8a9;hp=27c4b6931c974816797514fe987195d46387fcc5;hpb=005c470888ac2c04ba9263845d0ed3b19e9e6c69;p=platform%2Fupstream%2Fbtrfs-progs.git diff --git a/extent_io.h b/extent_io.h index 27c4b69..d407d93 100644 --- a/extent_io.h +++ b/extent_io.h @@ -29,25 +29,44 @@ #include #endif /* BTRFS_FLAT_INCLUDES */ -#define EXTENT_DIRTY 1 -#define EXTENT_WRITEBACK (1 << 1) -#define EXTENT_UPTODATE (1 << 2) -#define EXTENT_LOCKED (1 << 3) -#define EXTENT_NEW (1 << 4) -#define EXTENT_DELALLOC (1 << 5) -#define EXTENT_DEFRAG (1 << 6) -#define EXTENT_DEFRAG_DONE (1 << 7) -#define EXTENT_BUFFER_FILLED (1 << 8) -#define EXTENT_CSUM (1 << 9) -#define EXTENT_BAD_TRANSID (1 << 10) -#define EXTENT_BUFFER_DUMMY (1 << 11) +#define EXTENT_DIRTY (1U << 0) +#define EXTENT_WRITEBACK (1U << 1) +#define EXTENT_UPTODATE (1U << 2) +#define EXTENT_LOCKED (1U << 3) +#define EXTENT_NEW (1U << 4) +#define EXTENT_DELALLOC (1U << 5) +#define EXTENT_DEFRAG (1U << 6) +#define EXTENT_DEFRAG_DONE (1U << 7) +#define EXTENT_BUFFER_FILLED (1U << 8) +#define EXTENT_CSUM (1U << 9) +#define EXTENT_BAD_TRANSID (1U << 10) +#define EXTENT_BUFFER_DUMMY (1U << 11) #define EXTENT_IOBITS (EXTENT_LOCKED | EXTENT_WRITEBACK) -#define BLOCK_GROUP_DATA EXTENT_WRITEBACK -#define BLOCK_GROUP_METADATA EXTENT_UPTODATE -#define BLOCK_GROUP_SYSTEM EXTENT_NEW +#define BLOCK_GROUP_DATA (1U << 1) +#define BLOCK_GROUP_METADATA (1U << 2) +#define BLOCK_GROUP_SYSTEM (1U << 4) -#define BLOCK_GROUP_DIRTY EXTENT_DIRTY +#define BLOCK_GROUP_DIRTY (1U) + +/* + * The extent buffer bitmap operations are done with byte granularity instead of + * word granularity for two reasons: + * 1. The bitmaps must be little-endian on disk. + * 2. Bitmap items are not guaranteed to be aligned to a word and therefore a + * single word in a bitmap may straddle two pages in the extent buffer. + */ +#define BIT_BYTE(nr) ((nr) / BITS_PER_BYTE) +#define BYTE_MASK ((1 << BITS_PER_BYTE) - 1) +#define BITMAP_FIRST_BYTE_MASK(start) \ + ((BYTE_MASK << ((start) & (BITS_PER_BYTE - 1))) & BYTE_MASK) +#define BITMAP_LAST_BYTE_MASK(nbits) \ + (BYTE_MASK >> (-(nbits) & (BITS_PER_BYTE - 1))) + +static inline int le_test_bit(int nr, const u8 *addr) +{ + return 1U & (addr[BIT_BYTE(nr)] >> (nr & (BITS_PER_BYTE-1))); +} struct btrfs_fs_info; @@ -56,6 +75,7 @@ struct extent_io_tree { struct cache_tree cache; struct list_head lru; u64 cache_size; + u64 max_cache_size; }; struct extent_state { @@ -71,14 +91,15 @@ struct extent_buffer { struct cache_extent cache_node; u64 start; u64 dev_bytenr; - u32 len; struct extent_io_tree *tree; struct list_head lru; struct list_head recow; + u32 len; int refs; - int flags; + u32 flags; int fd; - char data[]; + struct btrfs_fs_info *fs_info; + char data[] __attribute__((aligned(8))); }; static inline void extent_buffer_get(struct extent_buffer *eb) @@ -87,27 +108,24 @@ static inline void extent_buffer_get(struct extent_buffer *eb) } void extent_io_tree_init(struct extent_io_tree *tree); +void extent_io_tree_init_cache_max(struct extent_io_tree *tree, + u64 max_cache_size); void extent_io_tree_cleanup(struct extent_io_tree *tree); -int set_extent_bits(struct extent_io_tree *tree, u64 start, - u64 end, int bits, gfp_t mask); -int clear_extent_bits(struct extent_io_tree *tree, u64 start, - u64 end, int bits, gfp_t mask); +int set_extent_bits(struct extent_io_tree *tree, u64 start, u64 end, int bits); +int clear_extent_bits(struct extent_io_tree *tree, u64 start, u64 end, int bits); int find_first_extent_bit(struct extent_io_tree *tree, u64 start, u64 *start_ret, u64 *end_ret, int bits); int test_range_bit(struct extent_io_tree *tree, u64 start, u64 end, int bits, int filled); -int set_extent_dirty(struct extent_io_tree *tree, u64 start, - u64 end, gfp_t mask); -int clear_extent_dirty(struct extent_io_tree *tree, u64 start, - u64 end, gfp_t mask); +int set_extent_dirty(struct extent_io_tree *tree, u64 start, u64 end); +int clear_extent_dirty(struct extent_io_tree *tree, u64 start, u64 end); static inline int set_extent_buffer_uptodate(struct extent_buffer *eb) { eb->flags |= EXTENT_UPTODATE; return 0; } -static inline int clear_extent_buffer_uptodate(struct extent_io_tree *tree, - struct extent_buffer *eb) +static inline int clear_extent_buffer_uptodate(struct extent_buffer *eb) { eb->flags &= ~EXTENT_UPTODATE; return 0; @@ -128,10 +146,11 @@ struct extent_buffer *find_extent_buffer(struct extent_io_tree *tree, u64 bytenr, u32 blocksize); struct extent_buffer *find_first_extent_buffer(struct extent_io_tree *tree, u64 start); -struct extent_buffer *alloc_extent_buffer(struct extent_io_tree *tree, +struct extent_buffer *alloc_extent_buffer(struct btrfs_fs_info *fs_info, u64 bytenr, u32 blocksize); struct extent_buffer *btrfs_clone_extent_buffer(struct extent_buffer *src); void free_extent_buffer(struct extent_buffer *eb); +void free_extent_buffer_nocache(struct extent_buffer *eb); int read_extent_from_disk(struct extent_buffer *eb, unsigned long offset, unsigned long len); int write_extent_to_disk(struct extent_buffer *eb); @@ -148,6 +167,8 @@ void memmove_extent_buffer(struct extent_buffer *dst, unsigned long dst_offset, unsigned long src_offset, unsigned long len); void memset_extent_buffer(struct extent_buffer *eb, char c, unsigned long start, unsigned long len); +int extent_buffer_test_bit(struct extent_buffer *eb, unsigned long start, + unsigned long nr); int set_extent_buffer_dirty(struct extent_buffer *eb); int clear_extent_buffer_dirty(struct extent_buffer *eb); int read_data_from_disk(struct btrfs_fs_info *info, void *buf, u64 offset,