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-rw-r--r--fs/xfs/xfs_linux.h12
1 files changed, 12 insertions, 0 deletions
diff --git a/fs/xfs/xfs_linux.h b/fs/xfs/xfs_linux.h
index e9d317a3da..d7873e0360 100644
--- a/fs/xfs/xfs_linux.h
+++ b/fs/xfs/xfs_linux.h
@@ -198,6 +198,18 @@ static inline uint64_t howmany_64(uint64_t x, uint32_t y)
return x;
}
+/* 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);