btrfs: clean up le_bitmap_{set, clear}()

[sfrench/cifs-2.6.git] / fs / btrfs / free-space-tree.c

diff --git a/fs/btrfs/free-space-tree.c b/fs/btrfs/free-space-tree.c
index 32a0f6cb55948aac654bc30e986adbeeaf5b451b..e03830d8331184e8580b6a7aea994ee5035da543 100644 (file)
--- a/fs/btrfs/free-space-tree.c
+++ b/fs/btrfs/free-space-tree.c
@@ -157,6 +157,26 @@ static u8 *alloc_bitmap(u32 bitmap_size)
        return ret;
 }
 
+static void le_bitmap_set(u8 *map, unsigned int start, int len)
+{
+       u8 *p = map + BIT_BYTE(start);
+       const unsigned int size = start + len;
+       int bits_to_set = BITS_PER_BYTE - (start % BITS_PER_BYTE);
+       u8 mask_to_set = BITMAP_FIRST_BYTE_MASK(start);
+
+       while (len - bits_to_set >= 0) {
+               *p |= mask_to_set;
+               len -= bits_to_set;
+               bits_to_set = BITS_PER_BYTE;
+               mask_to_set = ~0;
+               p++;
+       }
+       if (len) {
+               mask_to_set &= BITMAP_LAST_BYTE_MASK(size);
+               *p |= mask_to_set;
+       }
+}
+
 int convert_free_space_to_bitmaps(struct btrfs_trans_handle *trans,
                                  struct btrfs_fs_info *fs_info,
                                  struct btrfs_block_group_cache *block_group,