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41 lines
810 B
41 lines
810 B
/* SPDX-License-Identifier: GPL-2.0 */ |
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#ifndef _LINUX_BLOCKGROUP_LOCK_H |
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#define _LINUX_BLOCKGROUP_LOCK_H |
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/* |
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* Per-blockgroup locking for ext2 and ext3. |
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* |
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* Simple hashed spinlocking. |
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*/ |
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#include <linux/spinlock.h> |
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#include <linux/cache.h> |
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#ifdef CONFIG_SMP |
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#define NR_BG_LOCKS (4 << ilog2(NR_CPUS < 32 ? NR_CPUS : 32)) |
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#else |
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#define NR_BG_LOCKS 1 |
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#endif |
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struct bgl_lock { |
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spinlock_t lock; |
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} ____cacheline_aligned_in_smp; |
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struct blockgroup_lock { |
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struct bgl_lock locks[NR_BG_LOCKS]; |
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}; |
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static inline void bgl_lock_init(struct blockgroup_lock *bgl) |
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{ |
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int i; |
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for (i = 0; i < NR_BG_LOCKS; i++) |
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spin_lock_init(&bgl->locks[i].lock); |
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} |
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static inline spinlock_t * |
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bgl_lock_ptr(struct blockgroup_lock *bgl, unsigned int block_group) |
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{ |
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return &bgl->locks[block_group & (NR_BG_LOCKS-1)].lock; |
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} |
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#endif
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