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TOMOYO Linux Cross Reference
Linux/include/linux/blockgroup_lock.h

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  1 #ifndef _LINUX_BLOCKGROUP_LOCK_H
  2 #define _LINUX_BLOCKGROUP_LOCK_H
  3 /*
  4  * Per-blockgroup locking for ext2 and ext3.
  5  *
  6  * Simple hashed spinlocking.
  7  */
  8 
  9 #include <linux/spinlock.h>
 10 #include <linux/cache.h>
 11 
 12 #ifdef CONFIG_SMP
 13 #define NR_BG_LOCKS     (4 << ilog2(NR_CPUS < 32 ? NR_CPUS : 32))
 14 #else
 15 #define NR_BG_LOCKS     1
 16 #endif
 17 
 18 struct bgl_lock {
 19         spinlock_t lock;
 20 } ____cacheline_aligned_in_smp;
 21 
 22 struct blockgroup_lock {
 23         struct bgl_lock locks[NR_BG_LOCKS];
 24 };
 25 
 26 static inline void bgl_lock_init(struct blockgroup_lock *bgl)
 27 {
 28         int i;
 29 
 30         for (i = 0; i < NR_BG_LOCKS; i++)
 31                 spin_lock_init(&bgl->locks[i].lock);
 32 }
 33 
 34 static inline spinlock_t *
 35 bgl_lock_ptr(struct blockgroup_lock *bgl, unsigned int block_group)
 36 {
 37         return &bgl->locks[block_group & (NR_BG_LOCKS-1)].lock;
 38 }
 39 
 40 #endif
 41 

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