[GitHub/mt8127/android_kernel_alcatel_ttab.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
 */
#define EXTENT_STATUS_WRITTEN	(1ULL << 63)
#define EXTENT_STATUS_UNWRITTEN (1ULL << 62)
#define EXTENT_STATUS_DELAYED	(1ULL << 61)
#define EXTENT_STATUS_HOLE	(1ULL << 60)

#define EXTENT_STATUS_FLAGS	(EXTENT_STATUS_WRITTEN | \
				 EXTENT_STATUS_UNWRITTEN | \
				 EXTENT_STATUS_DELAYED | \
				 EXTENT_STATUS_HOLE)

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 */
};

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 long long 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(struct inode *inode, ext4_lblk_t lblk,
					struct extent_status *es);
extern int ext4_es_lookup_extent(struct inode *inode, ext4_lblk_t lblk,
				 struct extent_status *es);
extern int ext4_es_zeroout(struct inode *inode, struct ext4_extent *ex);

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

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

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

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

static inline ext4_fsblk_t ext4_es_status(struct extent_status *es)
{
	return (es->es_pblk & EXTENT_STATUS_FLAGS);
}

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

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

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

static inline void ext4_es_store_status(struct extent_status *es,
					unsigned long long status)
{
	ext4_fsblk_t block;

	block = (status & EXTENT_STATUS_FLAGS) |
		(es->es_pblk & ~EXTENT_STATUS_FLAGS);
	es->es_pblk = block;
}

extern void ext4_es_register_shrinker(struct super_block *sb);
extern void ext4_es_unregister_shrinker(struct super_block *sb);
extern void ext4_es_lru_add(struct inode *inode);
extern void ext4_es_lru_del(struct inode *inode);

#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	*/
	32	#define EXTENT_STATUS_WRITTEN (1ULL << 63)
	33	#define EXTENT_STATUS_UNWRITTEN (1ULL << 62)
	34	#define EXTENT_STATUS_DELAYED (1ULL << 61)
	35	#define EXTENT_STATUS_HOLE (1ULL << 60)
fdc0212e ZL	36
	37	#define EXTENT_STATUS_FLAGS (EXTENT_STATUS_WRITTEN \| \
	38	EXTENT_STATUS_UNWRITTEN \| \
	39	EXTENT_STATUS_DELAYED \| \
	40	EXTENT_STATUS_HOLE)
	41
adb23551 ZL	42	struct ext4_extent;
adb23551 ZL	43
c0677e6d ZL	44	struct extent_status {
c0677e6d ZL	45	struct rb_node rb_node;
06b0c886 ZL	46	ext4_lblk_t es_lblk; /* first logical block extent covers */
06b0c886 ZL	47	ext4_lblk_t es_len; /* length of extent in block */
fdc0212e	48	ext4_fsblk_t es_pblk; /* first physical block */
c0677e6d ZL	49	};
	50
	51	struct ext4_es_tree {
	52	struct rb_root root;
	53	struct extent_status cache_es; / recently accessed extent */
	54	};
	55
654598be ZL	56	extern int __init ext4_init_es(void);
	57	extern void ext4_exit_es(void);
	58	extern void ext4_es_init_tree(struct ext4_es_tree *tree);
	59
06b0c886	60	extern int ext4_es_insert_extent(struct inode *inode, ext4_lblk_t lblk,
fdc0212e ZL	61	ext4_lblk_t len, ext4_fsblk_t pblk,
fdc0212e ZL	62	unsigned long long status);
06b0c886	63	extern int ext4_es_remove_extent(struct inode *inode, ext4_lblk_t lblk,
654598be	64	ext4_lblk_t len);
be401363 ZL	65	extern void ext4_es_find_delayed_extent(struct inode *inode, ext4_lblk_t lblk,
be401363 ZL	66	struct extent_status *es);
d100eef2 ZL	67	extern int ext4_es_lookup_extent(struct inode *inode, ext4_lblk_t lblk,
d100eef2 ZL	68	struct extent_status *es);
adb23551	69	extern int ext4_es_zeroout(struct inode inode, struct ext4_extent ex);
654598be	70
fdc0212e ZL	71	static inline int ext4_es_is_written(struct extent_status *es)
fdc0212e ZL	72	{
8e919d13	73	return (es->es_pblk & EXTENT_STATUS_WRITTEN) != 0;
fdc0212e ZL	74	}
	75
	76	static inline int ext4_es_is_unwritten(struct extent_status *es)
	77	{
8e919d13	78	return (es->es_pblk & EXTENT_STATUS_UNWRITTEN) != 0;
fdc0212e ZL	79	}
	80
	81	static inline int ext4_es_is_delayed(struct extent_status *es)
	82	{
8e919d13	83	return (es->es_pblk & EXTENT_STATUS_DELAYED) != 0;
fdc0212e ZL	84	}
	85
	86	static inline int ext4_es_is_hole(struct extent_status *es)
	87	{
8e919d13	88	return (es->es_pblk & EXTENT_STATUS_HOLE) != 0;
fdc0212e ZL	89	}
	90
	91	static inline ext4_fsblk_t ext4_es_status(struct extent_status *es)
	92	{
	93	return (es->es_pblk & EXTENT_STATUS_FLAGS);
	94	}
	95
	96	static inline ext4_fsblk_t ext4_es_pblock(struct extent_status *es)
	97	{
	98	return (es->es_pblk & ~EXTENT_STATUS_FLAGS);
	99	}
	100
	101	static inline void ext4_es_store_pblock(struct extent_status *es,
	102	ext4_fsblk_t pb)
	103	{
	104	ext4_fsblk_t block;
	105
	106	block = (pb & ~EXTENT_STATUS_FLAGS) \|
	107	(es->es_pblk & EXTENT_STATUS_FLAGS);
	108	es->es_pblk = block;
	109	}
	110
	111	static inline void ext4_es_store_status(struct extent_status *es,
	112	unsigned long long status)
	113	{
	114	ext4_fsblk_t block;
	115
	116	block = (status & EXTENT_STATUS_FLAGS) \|
	117	(es->es_pblk & ~EXTENT_STATUS_FLAGS);
	118	es->es_pblk = block;
	119	}
	120
74cd15cd ZL	121	extern void ext4_es_register_shrinker(struct super_block *sb);
	122	extern void ext4_es_unregister_shrinker(struct super_block *sb);
	123	extern void ext4_es_lru_add(struct inode *inode);
	124	extern void ext4_es_lru_del(struct inode *inode);
	125
c0677e6d	126	#endif /* _EXT4_EXTENTS_STATUS_H */