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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/config.h> #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; }; 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