[mirror_ubuntu-artful-kernel.git] / fs / ext4 / extents_status.h

/*
 *  fs/ext4/extents_status.h
 *
 * Written by Yongqiang Yang <xiaoqiangnk@gmail.com>
 * Modified by
 *	Allison Henderson <achender@linux.vnet.ibm.com>
 *	Zheng Liu <wenqing.lz@taobao.com>
 *
 */

#ifndef _EXT4_EXTENTS_STATUS_H
#define _EXT4_EXTENTS_STATUS_H

/*
 * Turn on ES_DEBUG__ to get lots of info about extent status operations.
 */
#ifdef ES_DEBUG__
#define es_debug(fmt, ...)	printk(fmt, ##__VA_ARGS__)
#else
#define es_debug(fmt, ...)	no_printk(fmt, ##__VA_ARGS__)
#endif

/*
 * With ES_AGGRESSIVE_TEST defined, the result of es caching will be
 * checked with old map_block's result.
 */
#define ES_AGGRESSIVE_TEST__

/*
 * These flags live in the high bits of extent_status.es_pblk
 */
enum {
	ES_WRITTEN_B,
	ES_UNWRITTEN_B,
	ES_DELAYED_B,
	ES_HOLE_B,
	ES_REFERENCED_B,
	ES_FLAGS
};

#define ES_SHIFT (sizeof(ext4_fsblk_t)*8 - ES_FLAGS)
#define ES_MASK (~((ext4_fsblk_t)0) << ES_SHIFT)

#define EXTENT_STATUS_WRITTEN	(1 << ES_WRITTEN_B)
#define EXTENT_STATUS_UNWRITTEN (1 << ES_UNWRITTEN_B)
#define EXTENT_STATUS_DELAYED	(1 << ES_DELAYED_B)
#define EXTENT_STATUS_HOLE	(1 << ES_HOLE_B)
#define EXTENT_STATUS_REFERENCED	(1 << ES_REFERENCED_B)

#define ES_TYPE_MASK	((ext4_fsblk_t)(EXTENT_STATUS_WRITTEN | \
			  EXTENT_STATUS_UNWRITTEN | \
			  EXTENT_STATUS_DELAYED | \
			  EXTENT_STATUS_HOLE) << ES_SHIFT)

struct ext4_sb_info;
struct ext4_extent;

struct extent_status {
	struct rb_node rb_node;
	ext4_lblk_t es_lblk;	/* first logical block extent covers */
	ext4_lblk_t es_len;	/* length of extent in block */
	ext4_fsblk_t es_pblk;	/* first physical block */
};

struct ext4_es_tree {
	struct rb_root root;
	struct extent_status *cache_es;	/* recently accessed extent */
};

struct ext4_es_stats {
	unsigned long es_stats_shrunk;
	unsigned long es_stats_cache_hits;
	unsigned long es_stats_cache_misses;
	u64 es_stats_scan_time;
	u64 es_stats_max_scan_time;
	struct percpu_counter es_stats_all_cnt;
	struct percpu_counter es_stats_shk_cnt;
};

extern int __init ext4_init_es(void);
extern void ext4_exit_es(void);
extern void ext4_es_init_tree(struct ext4_es_tree *tree);

extern int ext4_es_insert_extent(struct inode *inode, ext4_lblk_t lblk,
				 ext4_lblk_t len, ext4_fsblk_t pblk,
				 unsigned int status);
extern void ext4_es_cache_extent(struct inode *inode, ext4_lblk_t lblk,
				 ext4_lblk_t len, ext4_fsblk_t pblk,
				 unsigned int status);
extern int ext4_es_remove_extent(struct inode *inode, ext4_lblk_t lblk,
				 ext4_lblk_t len);
extern void ext4_es_find_delayed_extent_range(struct inode *inode,
					ext4_lblk_t lblk, ext4_lblk_t end,
					struct extent_status *es);
extern int ext4_es_lookup_extent(struct inode *inode, ext4_lblk_t lblk,
				 struct extent_status *es);

static inline unsigned int ext4_es_status(struct extent_status *es)
{
	return es->es_pblk >> ES_SHIFT;
}

static inline unsigned int ext4_es_type(struct extent_status *es)
{
	return (es->es_pblk & ES_TYPE_MASK) >> ES_SHIFT;
}

static inline int ext4_es_is_written(struct extent_status *es)
{
	return (ext4_es_type(es) & EXTENT_STATUS_WRITTEN) != 0;
}

static inline int ext4_es_is_unwritten(struct extent_status *es)
{
	return (ext4_es_type(es) & EXTENT_STATUS_UNWRITTEN) != 0;
}

static inline int ext4_es_is_delayed(struct extent_status *es)
{
	return (ext4_es_type(es) & EXTENT_STATUS_DELAYED) != 0;
}

static inline int ext4_es_is_hole(struct extent_status *es)
{
	return (ext4_es_type(es) & EXTENT_STATUS_HOLE) != 0;
}

static inline void ext4_es_set_referenced(struct extent_status *es)
{
	es->es_pblk |= ((ext4_fsblk_t)EXTENT_STATUS_REFERENCED) << ES_SHIFT;
}

static inline void ext4_es_clear_referenced(struct extent_status *es)
{
	es->es_pblk &= ~(((ext4_fsblk_t)EXTENT_STATUS_REFERENCED) << ES_SHIFT);
}

static inline int ext4_es_is_referenced(struct extent_status *es)
{
	return (ext4_es_status(es) & EXTENT_STATUS_REFERENCED) != 0;
}

static inline ext4_fsblk_t ext4_es_pblock(struct extent_status *es)
{
	return es->es_pblk & ~ES_MASK;
}

static inline void ext4_es_store_pblock(struct extent_status *es,
					ext4_fsblk_t pb)
{
	ext4_fsblk_t block;

	block = (pb & ~ES_MASK) | (es->es_pblk & ES_MASK);
	es->es_pblk = block;
}

static inline void ext4_es_store_status(struct extent_status *es,
					unsigned int status)
{
	es->es_pblk = (((ext4_fsblk_t)status << ES_SHIFT) & ES_MASK) |
		      (es->es_pblk & ~ES_MASK);
}

static inline void ext4_es_store_pblock_status(struct extent_status *es,
					       ext4_fsblk_t pb,
					       unsigned int status)
{
	es->es_pblk = (((ext4_fsblk_t)status << ES_SHIFT) & ES_MASK) |
		      (pb & ~ES_MASK);
}

extern int ext4_es_register_shrinker(struct ext4_sb_info *sbi);
extern void ext4_es_unregister_shrinker(struct ext4_sb_info *sbi);

extern int ext4_seq_es_shrinker_info_show(struct seq_file *seq, void *v);

#endif /* _EXT4_EXTENTS_STATUS_H */
Commit	Line	Data
c0677e6d ZL	1	/*
	2	* fs/ext4/extents_status.h
	3	*
	4	* Written by Yongqiang Yang <xiaoqiangnk@gmail.com>
	5	* Modified by
	6	* Allison Henderson <achender@linux.vnet.ibm.com>
	7	* Zheng Liu <wenqing.lz@taobao.com>
	8	*
	9	*/
	10
	11	#ifndef _EXT4_EXTENTS_STATUS_H
	12	#define _EXT4_EXTENTS_STATUS_H
	13
654598be ZL	14	/*
	15	* Turn on ES_DEBUG__ to get lots of info about extent status operations.
	16	*/
	17	#ifdef ES_DEBUG__
	18	#define es_debug(fmt, ...) printk(fmt, ##__VA_ARGS__)
	19	#else
	20	#define es_debug(fmt, ...) no_printk(fmt, ##__VA_ARGS__)
	21	#endif
	22
921f266b DM	23	/*
	24	* With ES_AGGRESSIVE_TEST defined, the result of es caching will be
	25	* checked with old map_block's result.
	26	*/
	27	#define ES_AGGRESSIVE_TEST__
	28
8e919d13 TT	29	/*
	30	* These flags live in the high bits of extent_status.es_pblk
	31	*/
624d0f1d JK	32	enum {
	33	ES_WRITTEN_B,
	34	ES_UNWRITTEN_B,
	35	ES_DELAYED_B,
	36	ES_HOLE_B,
2be12de9	37	ES_REFERENCED_B,
624d0f1d JK	38	ES_FLAGS
624d0f1d JK	39	};
fdc0212e	40
624d0f1d JK	41	#define ES_SHIFT (sizeof(ext4_fsblk_t)*8 - ES_FLAGS)
624d0f1d JK	42	#define ES_MASK (~((ext4_fsblk_t)0) << ES_SHIFT)
3be78c73	43
624d0f1d JK	44	#define EXTENT_STATUS_WRITTEN (1 << ES_WRITTEN_B)
	45	#define EXTENT_STATUS_UNWRITTEN (1 << ES_UNWRITTEN_B)
	46	#define EXTENT_STATUS_DELAYED (1 << ES_DELAYED_B)
	47	#define EXTENT_STATUS_HOLE (1 << ES_HOLE_B)
2be12de9 JK	48	#define EXTENT_STATUS_REFERENCED (1 << ES_REFERENCED_B)
	49
	50	#define ES_TYPE_MASK ((ext4_fsblk_t)(EXTENT_STATUS_WRITTEN \| \
	51	EXTENT_STATUS_UNWRITTEN \| \
	52	EXTENT_STATUS_DELAYED \| \
	53	EXTENT_STATUS_HOLE) << ES_SHIFT)
3be78c73	54
d3922a77	55	struct ext4_sb_info;
adb23551 ZL	56	struct ext4_extent;
adb23551 ZL	57
c0677e6d ZL	58	struct extent_status {
c0677e6d ZL	59	struct rb_node rb_node;
06b0c886 ZL	60	ext4_lblk_t es_lblk; /* first logical block extent covers */
06b0c886 ZL	61	ext4_lblk_t es_len; /* length of extent in block */
fdc0212e	62	ext4_fsblk_t es_pblk; /* first physical block */
c0677e6d ZL	63	};
	64
	65	struct ext4_es_tree {
	66	struct rb_root root;
	67	struct extent_status cache_es; / recently accessed extent */
	68	};
	69
eb68d0e2	70	struct ext4_es_stats {
eb68d0e2 ZL	71	unsigned long es_stats_shrunk;
	72	unsigned long es_stats_cache_hits;
	73	unsigned long es_stats_cache_misses;
	74	u64 es_stats_scan_time;
	75	u64 es_stats_max_scan_time;
	76	struct percpu_counter es_stats_all_cnt;
edaa53ca	77	struct percpu_counter es_stats_shk_cnt;
eb68d0e2 ZL	78	};
eb68d0e2 ZL	79
654598be ZL	80	extern int __init ext4_init_es(void);
	81	extern void ext4_exit_es(void);
	82	extern void ext4_es_init_tree(struct ext4_es_tree *tree);
	83
06b0c886	84	extern int ext4_es_insert_extent(struct inode *inode, ext4_lblk_t lblk,
fdc0212e	85	ext4_lblk_t len, ext4_fsblk_t pblk,
3be78c73	86	unsigned int status);
107a7bd3 TT	87	extern void ext4_es_cache_extent(struct inode *inode, ext4_lblk_t lblk,
	88	ext4_lblk_t len, ext4_fsblk_t pblk,
	89	unsigned int status);
06b0c886	90	extern int ext4_es_remove_extent(struct inode *inode, ext4_lblk_t lblk,
654598be	91	ext4_lblk_t len);
e30b5dca YZ	92	extern void ext4_es_find_delayed_extent_range(struct inode *inode,
e30b5dca YZ	93	ext4_lblk_t lblk, ext4_lblk_t end,
be401363	94	struct extent_status *es);
d100eef2 ZL	95	extern int ext4_es_lookup_extent(struct inode *inode, ext4_lblk_t lblk,
d100eef2 ZL	96	struct extent_status *es);
654598be	97
624d0f1d JK	98	static inline unsigned int ext4_es_status(struct extent_status *es)
	99	{
	100	return es->es_pblk >> ES_SHIFT;
	101	}
	102
2be12de9 JK	103	static inline unsigned int ext4_es_type(struct extent_status *es)
	104	{
	105	return (es->es_pblk & ES_TYPE_MASK) >> ES_SHIFT;
	106	}
	107
fdc0212e ZL	108	static inline int ext4_es_is_written(struct extent_status *es)
fdc0212e ZL	109	{
2be12de9	110	return (ext4_es_type(es) & EXTENT_STATUS_WRITTEN) != 0;
fdc0212e ZL	111	}
	112
	113	static inline int ext4_es_is_unwritten(struct extent_status *es)
	114	{
2be12de9	115	return (ext4_es_type(es) & EXTENT_STATUS_UNWRITTEN) != 0;
fdc0212e ZL	116	}
	117
	118	static inline int ext4_es_is_delayed(struct extent_status *es)
	119	{
2be12de9	120	return (ext4_es_type(es) & EXTENT_STATUS_DELAYED) != 0;
fdc0212e ZL	121	}
	122
	123	static inline int ext4_es_is_hole(struct extent_status *es)
	124	{
2be12de9 JK	125	return (ext4_es_type(es) & EXTENT_STATUS_HOLE) != 0;
	126	}
	127
	128	static inline void ext4_es_set_referenced(struct extent_status *es)
	129	{
	130	es->es_pblk \|= ((ext4_fsblk_t)EXTENT_STATUS_REFERENCED) << ES_SHIFT;
	131	}
	132
	133	static inline void ext4_es_clear_referenced(struct extent_status *es)
	134	{
	135	es->es_pblk &= ~(((ext4_fsblk_t)EXTENT_STATUS_REFERENCED) << ES_SHIFT);
	136	}
	137
	138	static inline int ext4_es_is_referenced(struct extent_status *es)
	139	{
	140	return (ext4_es_status(es) & EXTENT_STATUS_REFERENCED) != 0;
fdc0212e ZL	141	}
	142
	143	static inline ext4_fsblk_t ext4_es_pblock(struct extent_status *es)
	144	{
3be78c73	145	return es->es_pblk & ~ES_MASK;
fdc0212e ZL	146	}
	147
	148	static inline void ext4_es_store_pblock(struct extent_status *es,
	149	ext4_fsblk_t pb)
	150	{
	151	ext4_fsblk_t block;
	152
3be78c73	153	block = (pb & ~ES_MASK) \| (es->es_pblk & ES_MASK);
fdc0212e ZL	154	es->es_pblk = block;
	155	}
	156
	157	static inline void ext4_es_store_status(struct extent_status *es,
3be78c73	158	unsigned int status)
fdc0212e	159	{
624d0f1d JK	160	es->es_pblk = (((ext4_fsblk_t)status << ES_SHIFT) & ES_MASK) \|
624d0f1d JK	161	(es->es_pblk & ~ES_MASK);
fdc0212e ZL	162	}
fdc0212e ZL	163
9a6633b1 TT	164	static inline void ext4_es_store_pblock_status(struct extent_status *es,
	165	ext4_fsblk_t pb,
	166	unsigned int status)
	167	{
624d0f1d JK	168	es->es_pblk = (((ext4_fsblk_t)status << ES_SHIFT) & ES_MASK) \|
624d0f1d JK	169	(pb & ~ES_MASK);
9a6633b1 TT	170	}
9a6633b1 TT	171
eb68d0e2	172	extern int ext4_es_register_shrinker(struct ext4_sb_info *sbi);
d3922a77	173	extern void ext4_es_unregister_shrinker(struct ext4_sb_info *sbi);
74cd15cd	174
ebd173be TT	175	extern int ext4_seq_es_shrinker_info_show(struct seq_file seq, void v);
ebd173be TT	176
c0677e6d	177	#endif /* _EXT4_EXTENTS_STATUS_H */