diff options
author | Dimitri John Ledkov <xnox@ubuntu.com> | 2016-08-11 12:45:00 +0100 |
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committer | Dimitri John Ledkov <xnox@ubuntu.com> | 2016-08-11 12:45:00 +0100 |
commit | ffd998be34a1a3d208106d051e85058ff9ac9667 (patch) | |
tree | 3f93a4a7362dcbdbadf5086e9404dc58ea22200a /extent_io.h | |
parent | 3d69435ee3292b4b1db2d61c4784789d75883821 (diff) |
Imported Upstream version 4.7
Diffstat (limited to 'extent_io.h')
-rw-r--r-- | extent_io.h | 53 |
1 files changed, 36 insertions, 17 deletions
diff --git a/extent_io.h b/extent_io.h index a9a73535..d9594c32 100644 --- a/extent_io.h +++ b/extent_io.h @@ -29,25 +29,44 @@ #include <btrfs/list.h> #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; @@ -76,7 +95,7 @@ struct extent_buffer { struct list_head lru; struct list_head recow; int refs; - int flags; + u32 flags; int fd; char data[]; }; |