ext4: Use atomic_t's in struct flex_groups
Reduce pressure on the sb_bgl_lock family of locks by using atomic_t's
to track the number of free blocks and inodes in each flex_group.
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
diff --git a/fs/ext4/ext4.h b/fs/ext4/ext4.h
index e5c273f..e52b48f 100644
--- a/fs/ext4/ext4.h
+++ b/fs/ext4/ext4.h
@@ -170,8 +170,8 @@
*/
struct flex_groups {
- __u32 free_inodes;
- __u32 free_blocks;
+ atomic_t free_inodes;
+ atomic_t free_blocks;
};
#define EXT4_BG_INODE_UNINIT 0x0001 /* Inode table/bitmap not in use */