50 typedef void (bh_end_io_t)(struct buffer_head *bh, int uptodate);
89 static __always_inline void set_buffer_##name(struct buffer_head *bh)	\
91 	if (!test_bit(BH_##bit, &(bh)->b_state))			\
92 		set_bit(BH_##bit, &(bh)->b_state);			\
94 static __always_inline void clear_buffer_##name(struct buffer_head *bh)	\
96 	clear_bit(BH_##bit, &(bh)->b_state);				\
98 static __always_inline int buffer_##name(const struct buffer_head *bh)	\
100 	return test_bit(BH_##bit, &(bh)->b_state);			\
107 static __always_inline int test_set_buffer_##name(struct buffer_head *bh) \
109 	return test_and_set_bit(BH_##bit, &(bh)->b_state);		\
111 static __always_inline int test_clear_buffer_##name(struct buffer_head *bh) \
113 	return test_and_clear_bit(BH_##bit, &(bh)->b_state);		\
138 static __always_inline void set_buffer_uptodate(struct buffer_head *bh)  in BUFFER_FNS()
148 	if (test_bit(BH_Uptodate, &bh->b_state))  in BUFFER_FNS()
156 	set_bit(BH_Uptodate, &bh->b_state);  in BUFFER_FNS()
159 static __always_inline void clear_buffer_uptodate(struct buffer_head *bh)  in clear_buffer_uptodate()  argument
161 	clear_bit(BH_Uptodate, &bh->b_state);  in clear_buffer_uptodate()
164 static __always_inline int buffer_uptodate(const struct buffer_head *bh)  in buffer_uptodate()  argument
170 	return test_bit_acquire(BH_Uptodate, &bh->b_state);  in buffer_uptodate()
173 #define bh_offset(bh)		((unsigned long)(bh)->b_data & ~PAGE_MASK)  argument
191 void mark_buffer_dirty(struct buffer_head *bh);
192 void mark_buffer_write_io_error(struct buffer_head *bh);
193 void touch_buffer(struct buffer_head *bh);
194 void set_bh_page(struct buffer_head *bh,
201 void end_buffer_read_sync(struct buffer_head *bh, int uptodate);
202 void end_buffer_write_sync(struct buffer_head *bh, int uptodate);
203 void end_buffer_async_write(struct buffer_head *bh, int uptodate);
206 void mark_buffer_dirty_inode(struct buffer_head *bh, struct inode *inode);
213 static inline void clean_bdev_bh_alias(struct buffer_head *bh)  in clean_bdev_bh_alias()  argument
215 	clean_bdev_aliases(bh->b_bdev, bh->b_blocknr, 1);  in clean_bdev_bh_alias()
218 void mark_buffer_async_write(struct buffer_head *bh);
220 wait_queue_head_t *bh_waitq_head(struct buffer_head *bh);
234 void free_buffer_head(struct buffer_head * bh);
235 void unlock_buffer(struct buffer_head *bh);
236 void __lock_buffer(struct buffer_head *bh);
237 int sync_dirty_buffer(struct buffer_head *bh);
238 int __sync_dirty_buffer(struct buffer_head *bh, blk_opf_t op_flags);
239 void write_dirty_buffer(struct buffer_head *bh, blk_opf_t op_flags);
243 int bh_uptodate_or_lock(struct buffer_head *bh);
244 int __bh_read(struct buffer_head *bh, blk_opf_t op_flags, bool wait);
312 static inline void get_bh(struct buffer_head *bh)  in get_bh()  argument
314         atomic_inc(&bh->b_count);  in get_bh()
317 static inline void put_bh(struct buffer_head *bh)  in put_bh()  argument
320         atomic_dec(&bh->b_count);  in put_bh()
323 static inline void brelse(struct buffer_head *bh)  in brelse()  argument
325 	if (bh)  in brelse()
326 		__brelse(bh);  in brelse()
329 static inline void bforget(struct buffer_head *bh)  in bforget()  argument
331 	if (bh)  in bforget()
332 		__bforget(bh);  in bforget()
373 map_bh(struct buffer_head *bh, struct super_block *sb, sector_t block)  in map_bh()  argument
375 	set_buffer_mapped(bh);  in map_bh()
376 	bh->b_bdev = sb->s_bdev;  in map_bh()
377 	bh->b_blocknr = block;  in map_bh()
378 	bh->b_size = sb->s_blocksize;  in map_bh()
381 static inline void wait_on_buffer(struct buffer_head *bh)  in wait_on_buffer()  argument
384 	if (buffer_locked(bh))  in wait_on_buffer()
385 		__wait_on_buffer(bh);  in wait_on_buffer()
388 static inline int trylock_buffer(struct buffer_head *bh)  in trylock_buffer()  argument
390 	return likely(!test_and_set_bit_lock(BH_Lock, &bh->b_state));  in trylock_buffer()
393 static inline void lock_buffer(struct buffer_head *bh)  in lock_buffer()  argument
396 	if (!trylock_buffer(bh))  in lock_buffer()
397 		__lock_buffer(bh);  in lock_buffer()
414 static inline void bh_readahead(struct buffer_head *bh, blk_opf_t op_flags)  in bh_readahead()  argument
416 	if (!buffer_uptodate(bh) && trylock_buffer(bh)) {  in bh_readahead()
417 		if (!buffer_uptodate(bh))  in bh_readahead()
418 			__bh_read(bh, op_flags, false);  in bh_readahead()
420 			unlock_buffer(bh);  in bh_readahead()
424 static inline void bh_read_nowait(struct buffer_head *bh, blk_opf_t op_flags)  in bh_read_nowait()  argument
426 	if (!bh_uptodate_or_lock(bh))  in bh_read_nowait()
427 		__bh_read(bh, op_flags, false);  in bh_read_nowait()
431 static inline int bh_read(struct buffer_head *bh, blk_opf_t op_flags)  in bh_read()  argument
433 	if (bh_uptodate_or_lock(bh))  in bh_read()
435 	return __bh_read(bh, op_flags, true);  in bh_read()