57 lines
1 KiB
C
57 lines
1 KiB
C
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#ifndef _LINUX_LOCKS_H
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#define _LINUX_LOCKS_H
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/*
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* Buffer cache locking - note that interrupts may only unlock, not
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* lock buffers.
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*/
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extern void __wait_on_buffer(struct buffer_head *);
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extern inline void wait_on_buffer(struct buffer_head * bh)
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{
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if (bh->b_lock)
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__wait_on_buffer(bh);
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}
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extern inline void lock_buffer(struct buffer_head * bh)
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{
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if (bh->b_lock)
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__wait_on_buffer(bh);
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bh->b_lock = 1;
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}
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extern inline void unlock_buffer(struct buffer_head * bh)
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{
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bh->b_lock = 0;
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wake_up(&bh->b_wait);
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}
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/*
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* super-block locking. Again, interrupts may only unlock
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* a super-block (although even this isn't done right now.
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* nfs may need it).
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*/
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extern void __wait_on_super(struct super_block *);
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extern inline void wait_on_super(struct super_block * sb)
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{
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if (sb->s_lock)
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__wait_on_super(sb);
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}
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extern inline void lock_super(struct super_block * sb)
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{
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if (sb->s_lock)
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__wait_on_super(sb);
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sb->s_lock = 1;
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}
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extern inline void unlock_super(struct super_block * sb)
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{
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sb->s_lock = 0;
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wake_up(&sb->s_wait);
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}
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#endif /* _LINUX_LOCKS_H */
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