You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
40 lines
771 B
40 lines
771 B
#ifndef _LINUX_BLOCKGROUP_LOCK_H
|
|
#define _LINUX_BLOCKGROUP_LOCK_H
|
|
/*
|
|
* Per-blockgroup locking for ext2 and ext3.
|
|
*
|
|
* Simple hashed spinlocking.
|
|
*/
|
|
|
|
#include <linux/spinlock.h>
|
|
#include <linux/cache.h>
|
|
|
|
#ifdef CONFIG_SMP
|
|
#define NR_BG_LOCKS (4 << ilog2(NR_CPUS < 32 ? NR_CPUS : 32))
|
|
#else
|
|
#define NR_BG_LOCKS 1
|
|
#endif
|
|
|
|
struct bgl_lock {
|
|
spinlock_t lock;
|
|
} ____cacheline_aligned_in_smp;
|
|
|
|
struct blockgroup_lock {
|
|
struct bgl_lock locks[NR_BG_LOCKS];
|
|
};
|
|
|
|
static inline void bgl_lock_init(struct blockgroup_lock *bgl)
|
|
{
|
|
int i;
|
|
|
|
for (i = 0; i < NR_BG_LOCKS; i++)
|
|
spin_lock_init(&bgl->locks[i].lock);
|
|
}
|
|
|
|
static inline spinlock_t *
|
|
bgl_lock_ptr(struct blockgroup_lock *bgl, unsigned int block_group)
|
|
{
|
|
return &bgl->locks[block_group & (NR_BG_LOCKS-1)].lock;
|
|
}
|
|
|
|
#endif
|
|
|