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(I'm so sorry!) Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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C
123456789101112131415161718192021222324252627282930313233343536373839404142/* 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 (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