ext4: introduce ext4_get_group_number()
Currently on many places in ext4 we're using
ext4_get_group_no_and_offset() even though we're only interested in
knowing the block group of the particular block, not the offset within
the block group so we can use more efficient way to compute block
group.
This patch introduces ext4_get_group_number() which computes block
group for a given block much more efficiently. Use this function
instead of ext4_get_group_no_and_offset() everywhere where we're only
interested in knowing the block group.
Signed-off-by: Lukas Czerner <lczerner@redhat.com>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
diff --git a/fs/ext4/ext4.h b/fs/ext4/ext4.h
index cc58aa8..a0637e5 100644
--- a/fs/ext4/ext4.h
+++ b/fs/ext4/ext4.h
@@ -1793,9 +1793,6 @@
*/
#define ERR_BAD_DX_DIR -75000
-void ext4_get_group_no_and_offset(struct super_block *sb, ext4_fsblk_t blocknr,
- ext4_group_t *blockgrpp, ext4_grpblk_t *offsetp);
-
/*
* Timeout and state flag for lazy initialization inode thread.
*/
@@ -1917,6 +1914,13 @@
struct buffer_head *bh);
/* balloc.c */
+extern void ext4_get_group_no_and_offset(struct super_block *sb,
+ ext4_fsblk_t blocknr,
+ ext4_group_t *blockgrpp,
+ ext4_grpblk_t *offsetp);
+extern ext4_group_t ext4_get_group_number(struct super_block *sb,
+ ext4_fsblk_t block);
+
extern void ext4_validate_block_bitmap(struct super_block *sb,
struct ext4_group_desc *desc,
unsigned int block_group,