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Viewing file:     blockgroup_lock.h (1.09 KB)      -rw-r--r--
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#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);
}

/*
 * The accessor is a macro so we can embed a blockgroup_lock into different
 * superblock types
 */
#define sb_bgl_lock(sb, block_group) \
    (&(sb)->s_blockgroup_lock.locks[(block_group) & (NR_BG_LOCKS-1)].lock)

#endif

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