linux/include/linux/blockgroup_lock.h

/* SPDX-License-Identifier: GPL-2.0 */
#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 …
#else
#define NR_BG_LOCKS …
#endif

struct bgl_lock { … } ____cacheline_aligned_in_smp;

struct blockgroup_lock { … };

static inline void bgl_lock_init(struct blockgroup_lock *bgl)
{ … }

static inline spinlock_t *
bgl_lock_ptr(struct blockgroup_lock *bgl, unsigned int block_group)
{ … }

#endif