1 /**************************************************************************** 2 **************************************************************************** 3 *** 4 *** This header was automatically generated from a Linux kernel header 5 *** of the same name, to make information necessary for userspace to 6 *** call into the kernel available to libc. It contains only constants, 7 *** structures, and macros generated from the original header, and thus, 8 *** contains no copyrightable information. 9 *** 10 **************************************************************************** 11 ****************************************************************************/ 12 #ifndef _LINUX_BLOCKGROUP_LOCK_H 13 #define _LINUX_BLOCKGROUP_LOCK_H 14 15 #include <linux/spinlock.h> 16 #include <linux/cache.h> 17 18 #define NR_BG_LOCKS 1 19 20 struct bgl_lock { 21 spinlock_t lock; 22 } ____cacheline_aligned_in_smp; 23 24 struct blockgroup_lock { 25 struct bgl_lock locks[NR_BG_LOCKS]; 26 }; 27 28 #define sb_bgl_lock(sb, block_group) (&(sb)->s_blockgroup_lock.locks[(block_group) & (NR_BG_LOCKS-1)].lock) 29 #endif 30