udf: move calculating of nr_groups into helper function

Signed-off-by: Marcin Slusarz <marcin.slusarz@gmail.com>
Cc: Ben Fennema <bfennema@falcon.csc.calpoly.edu>
Acked-by: Jan Kara <jack@suse.cz>
Cc: Christoph Hellwig <hch@infradead.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 10 insertions, 6 deletions

diff --git a/fs/udf/super.c b/fs/udf/super.c
index 86aa2238bc7b..c19ee38e85b3 100644
--- a/fs/udf/super.c
+++ b/fs/udf/super.c
@@ -937,18 +937,22 @@ static void udf_load_fileset(struct super_block *sb, struct buffer_head *bh,
                   root->logicalBlockNum, root->partitionReferenceNum);
 }
 
+int udf_compute_nr_groups(struct super_block *sb, u32 partition)
+{
+        struct udf_part_map *map = &UDF_SB(sb)->s_partmaps[partition];
+        return (map->s_partition_len +
+                (sizeof(struct spaceBitmapDesc) << 3) +
+                (sb->s_blocksize * 8) - 1) /
+                (sb->s_blocksize * 8);
+}
+
 static struct udf_bitmap *udf_sb_alloc_bitmap(struct super_block *sb, u32 index)
 {
-        struct udf_part_map *map = &UDF_SB(sb)->s_partmaps[index];
         struct udf_bitmap *bitmap;
         int nr_groups;
         int size;
 
-        /* TODO: move calculating of nr_groups into helper function */
-        nr_groups = (map->s_partition_len +
-                        (sizeof(struct spaceBitmapDesc) << 3) +
-                        (sb->s_blocksize * 8) - 1) /
-                        (sb->s_blocksize * 8);
+        nr_groups = udf_compute_nr_groups(sb, index);
         size = sizeof(struct udf_bitmap) +
                 (sizeof(struct buffer_head *) * nr_groups);