Release 4.7 include/linux/blockgroup_lock.h

#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

/*
 * We want a power-of-two.  Is there a better way than this?
 */

#if NR_CPUS >= 32

#define NR_BG_LOCKS	128
#elif NR_CPUS >= 16

#define NR_BG_LOCKS	64
#elif NR_CPUS >= 8

#define NR_BG_LOCKS	32
#elif NR_CPUS >= 4

#define NR_BG_LOCKS	16
#elif NR_CPUS >= 2

#define NR_BG_LOCKS	8
#else

#define NR_BG_LOCKS	4
#endif

#else	/* CONFIG_SMP */

#define NR_BG_LOCKS	1
#endif	/* CONFIG_SMP */


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);
}

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/*
 * The accessor is a macro so we can embed a blockgroup_lock into different
 * superblock types
 */

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;
}

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#endif
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Directory: include/linux

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