Since block I/O is always done in unit of 512 bytes, add BI_SECTOR_SIZE
and BI_SECTOR_SHIFT macros and to_sector() and to_bytes() for later
use.
Although the best position to define such things should be bvec.h, and
to_sector() to_bytes() are also defined in device-mapper.h, there are
a lot of code defining their own SECTOR_SIZE and to_bytes() in
device-mapper is not using u64 (unsigned long long) but unsigned long,
which doesn't fit btrfs usage.
So define btrfs' own macros and inlined converters.
Signed-off-by: Qu Wenruo <wqu@xxxxxxxx>
---
fs/btrfs/ctree.h | 13 +++++++++++++
1 file changed, 13 insertions(+)
diff --git a/fs/btrfs/ctree.h b/fs/btrfs/ctree.h
index 8fc690384c58..8f6f57167661 100644
--- a/fs/btrfs/ctree.h
+++ b/fs/btrfs/ctree.h
@@ -3734,4 +3734,17 @@ static inline int btrfs_is_testing(struct btrfs_fs_info *fs_info)
#endif
return 0;
}
+
+#define BI_SECTOR_SHIFT (9)
+#define BI_SECTOR_SIZE (1 << BI_SECTOR_SHIFT)
+
+static inline u64 to_bytes(sector_t n)
+{
+ return ((u64)n << BI_SECTOR_SHIFT);
+}
+
+static inline sector_t to_sector(u64 n)
+{
+ return (n >> BI_SECTOR_SHIFT);
+}
#endif
--
2.15.0
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