diff options
Diffstat (limited to 'fs/xfs/xfs_linux.h')
-rw-r--r-- | fs/xfs/xfs_linux.h | 12 |
1 files changed, 12 insertions, 0 deletions
diff --git a/fs/xfs/xfs_linux.h b/fs/xfs/xfs_linux.h index 4b14cf9a750f..4f40e57531ea 100644 --- a/fs/xfs/xfs_linux.h +++ b/fs/xfs/xfs_linux.h @@ -198,6 +198,18 @@ static inline bool isaligned_64(uint64_t x, uint32_t y) return do_div(x, y) == 0; } +/* If @b is a power of 2, return log2(b). Else return -1. */ +static inline int8_t log2_if_power2(unsigned long b) +{ + return is_power_of_2(b) ? ilog2(b) : -1; +} + +/* If @b is a power of 2, return a mask of the lower bits, else return zero. */ +static inline unsigned long long mask64_if_power2(unsigned long b) +{ + return is_power_of_2(b) ? b - 1 : 0; +} + int xfs_rw_bdev(struct block_device *bdev, sector_t sector, unsigned int count, char *data, enum req_op op); |