[GitHub/mt8127/android_kernel_alcatel_ttab.git] / fs / xfs / xfs_buf_item.h

/*
 * Copyright (c) 2000-2001,2005 Silicon Graphics, Inc.
 * All Rights Reserved.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License as
 * published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it would be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write the Free Software Foundation,
 * Inc.,  51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
 */
#ifndef	__XFS_BUF_ITEM_H__
#define	__XFS_BUF_ITEM_H__

extern kmem_zone_t	*xfs_buf_item_zone;

/*
 * This flag indicates that the buffer contains on disk inodes
 * and requires special recovery handling.
 */
#define	XFS_BLF_INODE_BUF	(1<<0)
/*
 * This flag indicates that the buffer should not be replayed
 * during recovery because its blocks are being freed.
 */
#define	XFS_BLF_CANCEL		(1<<1)

/*
 * This flag indicates that the buffer contains on disk
 * user or group dquots and may require special recovery handling.
 */
#define	XFS_BLF_UDQUOT_BUF	(1<<2)
#define XFS_BLF_PDQUOT_BUF	(1<<3)
#define	XFS_BLF_GDQUOT_BUF	(1<<4)

#define	XFS_BLF_CHUNK		128
#define	XFS_BLF_SHIFT		7
#define	BIT_TO_WORD_SHIFT	5
#define	NBWORD			(NBBY * sizeof(unsigned int))

/*
 * This is the structure used to lay out a buf log item in the
 * log.  The data map describes which 128 byte chunks of the buffer
 * have been logged.
 */
#define XFS_BLF_DATAMAP_SIZE	((XFS_MAX_BLOCKSIZE / XFS_BLF_CHUNK) / NBWORD)

typedef struct xfs_buf_log_format {
	unsigned short	blf_type;	/* buf log item type indicator */
	unsigned short	blf_size;	/* size of this item */
	ushort		blf_flags;	/* misc state */
	ushort		blf_len;	/* number of blocks in this buf */
	__int64_t	blf_blkno;	/* starting blkno of this buf */
	unsigned int	blf_map_size;	/* used size of data bitmap in words */
	unsigned int	blf_data_map[XFS_BLF_DATAMAP_SIZE]; /* dirty bitmap */
} xfs_buf_log_format_t;

/*
 * All buffers now need to tell recovery where the magic number
 * is so that it can verify and calculate the CRCs on the buffer correctly
 * once the changes have been replayed into the buffer.
 *
 * The type value is held in the upper 5 bits of the blf_flags field, which is
 * an unsigned 16 bit field. Hence we need to shift it 11 bits up and down.
 */
#define XFS_BLFT_BITS	5
#define XFS_BLFT_SHIFT	11
#define XFS_BLFT_MASK	(((1 << XFS_BLFT_BITS) - 1) << XFS_BLFT_SHIFT)

enum xfs_blft {
	XFS_BLFT_UNKNOWN_BUF = 0,
	XFS_BLFT_UDQUOT_BUF,
	XFS_BLFT_PDQUOT_BUF,
	XFS_BLFT_GDQUOT_BUF,
	XFS_BLFT_BTREE_BUF,
	XFS_BLFT_AGF_BUF,
	XFS_BLFT_AGFL_BUF,
	XFS_BLFT_AGI_BUF,
	XFS_BLFT_DINO_BUF,
	XFS_BLFT_SYMLINK_BUF,
	XFS_BLFT_DIR_BLOCK_BUF,
	XFS_BLFT_DIR_DATA_BUF,
	XFS_BLFT_DIR_FREE_BUF,
	XFS_BLFT_DIR_LEAF1_BUF,
	XFS_BLFT_DIR_LEAFN_BUF,
	XFS_BLFT_DA_NODE_BUF,
	XFS_BLFT_ATTR_LEAF_BUF,
	XFS_BLFT_ATTR_RMT_BUF,
	XFS_BLFT_SB_BUF,
	XFS_BLFT_MAX_BUF = (1 << XFS_BLFT_BITS),
};

static inline void
xfs_blft_to_flags(struct xfs_buf_log_format *blf, enum xfs_blft type)
{
	ASSERT(type > XFS_BLFT_UNKNOWN_BUF && type < XFS_BLFT_MAX_BUF);
	blf->blf_flags &= ~XFS_BLFT_MASK;
	blf->blf_flags |= ((type << XFS_BLFT_SHIFT) & XFS_BLFT_MASK);
}

static inline __uint16_t
xfs_blft_from_flags(struct xfs_buf_log_format *blf)
{
	return (blf->blf_flags & XFS_BLFT_MASK) >> XFS_BLFT_SHIFT;
}

/*
 * buf log item flags
 */
#define	XFS_BLI_HOLD		0x01
#define	XFS_BLI_DIRTY		0x02
#define	XFS_BLI_STALE		0x04
#define	XFS_BLI_LOGGED		0x08
#define	XFS_BLI_INODE_ALLOC_BUF	0x10
#define XFS_BLI_STALE_INODE	0x20
#define	XFS_BLI_INODE_BUF	0x40

#define XFS_BLI_FLAGS \
	{ XFS_BLI_HOLD,		"HOLD" }, \
	{ XFS_BLI_DIRTY,	"DIRTY" }, \
	{ XFS_BLI_STALE,	"STALE" }, \
	{ XFS_BLI_LOGGED,	"LOGGED" }, \
	{ XFS_BLI_INODE_ALLOC_BUF, "INODE_ALLOC" }, \
	{ XFS_BLI_STALE_INODE,	"STALE_INODE" }, \
	{ XFS_BLI_INODE_BUF,	"INODE_BUF" }


#ifdef __KERNEL__

struct xfs_buf;
struct xfs_mount;
struct xfs_buf_log_item;

/*
 * This is the in core log item structure used to track information
 * needed to log buffers.  It tracks how many times the lock has been
 * locked, and which 128 byte chunks of the buffer are dirty.
 */
typedef struct xfs_buf_log_item {
	xfs_log_item_t		bli_item;	/* common item structure */
	struct xfs_buf		*bli_buf;	/* real buffer pointer */
	unsigned int		bli_flags;	/* misc flags */
	unsigned int		bli_recur;	/* lock recursion count */
	atomic_t		bli_refcount;	/* cnt of tp refs */
	int			bli_format_count;	/* count of headers */
	struct xfs_buf_log_format *bli_formats;	/* array of in-log header ptrs */
	struct xfs_buf_log_format __bli_format;	/* embedded in-log header */
} xfs_buf_log_item_t;

void	xfs_buf_item_init(struct xfs_buf *, struct xfs_mount *);
void	xfs_buf_item_relse(struct xfs_buf *);
void	xfs_buf_item_log(xfs_buf_log_item_t *, uint, uint);
uint	xfs_buf_item_dirty(xfs_buf_log_item_t *);
void	xfs_buf_attach_iodone(struct xfs_buf *,
			      void(*)(struct xfs_buf *, xfs_log_item_t *),
			      xfs_log_item_t *);
void	xfs_buf_iodone_callbacks(struct xfs_buf *);
void	xfs_buf_iodone(struct xfs_buf *, struct xfs_log_item *);

void	xfs_trans_buf_set_type(struct xfs_trans *, struct xfs_buf *,
			       enum xfs_blft);
void	xfs_trans_buf_copy_type(struct xfs_buf *dst_bp, struct xfs_buf *src_bp);

#endif	/* __KERNEL__ */

#endif	/* __XFS_BUF_ITEM_H__ */
Commit	Line	Data
1da177e4	1	/*
7b718769 NS	2	* Copyright (c) 2000-2001,2005 Silicon Graphics, Inc.
7b718769 NS	3	* All Rights Reserved.
1da177e4	4	*
7b718769 NS	5	* This program is free software; you can redistribute it and/or
7b718769 NS	6	* modify it under the terms of the GNU General Public License as
1da177e4 LT	7	* published by the Free Software Foundation.
1da177e4 LT	8	*
7b718769 NS	9	* This program is distributed in the hope that it would be useful,
	10	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	11	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	12	* GNU General Public License for more details.
1da177e4	13	*
7b718769 NS	14	* You should have received a copy of the GNU General Public License
	15	* along with this program; if not, write the Free Software Foundation,
	16	* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
1da177e4 LT	17	*/
	18	#ifndef __XFS_BUF_ITEM_H__
	19	#define __XFS_BUF_ITEM_H__
	20
a8272ce0 DC	21	extern kmem_zone_t *xfs_buf_item_zone;
a8272ce0 DC	22
1da177e4 LT	23	/*
	24	* This flag indicates that the buffer contains on disk inodes
	25	* and requires special recovery handling.
	26	*/
ee1a47ab	27	#define XFS_BLF_INODE_BUF (1<<0)
1da177e4 LT	28	/*
	29	* This flag indicates that the buffer should not be replayed
	30	* during recovery because its blocks are being freed.
	31	*/
ee1a47ab CH	32	#define XFS_BLF_CANCEL (1<<1)
ee1a47ab CH	33
1da177e4 LT	34	/*
	35	* This flag indicates that the buffer contains on disk
	36	* user or group dquots and may require special recovery handling.
	37	*/
ee1a47ab CH	38	#define XFS_BLF_UDQUOT_BUF (1<<2)
	39	#define XFS_BLF_PDQUOT_BUF (1<<3)
	40	#define XFS_BLF_GDQUOT_BUF (1<<4)
	41
c1155410 DC	42	#define XFS_BLF_CHUNK 128
c1155410 DC	43	#define XFS_BLF_SHIFT 7
1da177e4 LT	44	#define BIT_TO_WORD_SHIFT 5
	45	#define NBWORD (NBBY * sizeof(unsigned int))
	46
77c1a08f DC	47	/*
	48	* This is the structure used to lay out a buf log item in the
	49	* log. The data map describes which 128 byte chunks of the buffer
	50	* have been logged.
	51	*/
	52	#define XFS_BLF_DATAMAP_SIZE ((XFS_MAX_BLOCKSIZE / XFS_BLF_CHUNK) / NBWORD)
	53
	54	typedef struct xfs_buf_log_format {
	55	unsigned short blf_type; /* buf log item type indicator */
	56	unsigned short blf_size; /* size of this item */
	57	ushort blf_flags; /* misc state */
	58	ushort blf_len; /* number of blocks in this buf */
	59	__int64_t blf_blkno; /* starting blkno of this buf */
	60	unsigned int blf_map_size; /* used size of data bitmap in words */
	61	unsigned int blf_data_map[XFS_BLF_DATAMAP_SIZE]; /* dirty bitmap */
	62	} xfs_buf_log_format_t;
	63
61fe135c DC	64	/*
	65	* All buffers now need to tell recovery where the magic number
	66	* is so that it can verify and calculate the CRCs on the buffer correctly
	67	* once the changes have been replayed into the buffer.
	68	*
	69	* The type value is held in the upper 5 bits of the blf_flags field, which is
	70	* an unsigned 16 bit field. Hence we need to shift it 11 bits up and down.
	71	*/
	72	#define XFS_BLFT_BITS 5
	73	#define XFS_BLFT_SHIFT 11
	74	#define XFS_BLFT_MASK (((1 << XFS_BLFT_BITS) - 1) << XFS_BLFT_SHIFT)
	75
	76	enum xfs_blft {
	77	XFS_BLFT_UNKNOWN_BUF = 0,
	78	XFS_BLFT_UDQUOT_BUF,
	79	XFS_BLFT_PDQUOT_BUF,
	80	XFS_BLFT_GDQUOT_BUF,
	81	XFS_BLFT_BTREE_BUF,
	82	XFS_BLFT_AGF_BUF,
	83	XFS_BLFT_AGFL_BUF,
	84	XFS_BLFT_AGI_BUF,
	85	XFS_BLFT_DINO_BUF,
	86	XFS_BLFT_SYMLINK_BUF,
	87	XFS_BLFT_DIR_BLOCK_BUF,
	88	XFS_BLFT_DIR_DATA_BUF,
	89	XFS_BLFT_DIR_FREE_BUF,
	90	XFS_BLFT_DIR_LEAF1_BUF,
	91	XFS_BLFT_DIR_LEAFN_BUF,
	92	XFS_BLFT_DA_NODE_BUF,
	93	XFS_BLFT_ATTR_LEAF_BUF,
	94	XFS_BLFT_ATTR_RMT_BUF,
	95	XFS_BLFT_SB_BUF,
	96	XFS_BLFT_MAX_BUF = (1 << XFS_BLFT_BITS),
	97	};
	98
	99	static inline void
	100	xfs_blft_to_flags(struct xfs_buf_log_format *blf, enum xfs_blft type)
	101	{
	102	ASSERT(type > XFS_BLFT_UNKNOWN_BUF && type < XFS_BLFT_MAX_BUF);
	103	blf->blf_flags &= ~XFS_BLFT_MASK;
	104	blf->blf_flags \|= ((type << XFS_BLFT_SHIFT) & XFS_BLFT_MASK);
	105	}
	106
	107	static inline __uint16_t
	108	xfs_blft_from_flags(struct xfs_buf_log_format *blf)
	109	{
	110	return (blf->blf_flags & XFS_BLFT_MASK) >> XFS_BLFT_SHIFT;
	111	}
	112
1da177e4 LT	113	/*
	114	* buf log item flags
	115	*/
	116	#define XFS_BLI_HOLD 0x01
	117	#define XFS_BLI_DIRTY 0x02
	118	#define XFS_BLI_STALE 0x04
	119	#define XFS_BLI_LOGGED 0x08
	120	#define XFS_BLI_INODE_ALLOC_BUF 0x10
	121	#define XFS_BLI_STALE_INODE 0x20
ccf7c23f	122	#define XFS_BLI_INODE_BUF 0x40
1da177e4	123
0b1b213f CH	124	#define XFS_BLI_FLAGS \
	125	{ XFS_BLI_HOLD, "HOLD" }, \
	126	{ XFS_BLI_DIRTY, "DIRTY" }, \
	127	{ XFS_BLI_STALE, "STALE" }, \
	128	{ XFS_BLI_LOGGED, "LOGGED" }, \
	129	{ XFS_BLI_INODE_ALLOC_BUF, "INODE_ALLOC" }, \
ccf7c23f DC	130	{ XFS_BLI_STALE_INODE, "STALE_INODE" }, \
ccf7c23f DC	131	{ XFS_BLI_INODE_BUF, "INODE_BUF" }
0b1b213f	132
1da177e4 LT	133
	134	#ifdef __KERNEL__
	135
	136	struct xfs_buf;
1da177e4 LT	137	struct xfs_mount;
	138	struct xfs_buf_log_item;
	139
1da177e4 LT	140	/*
	141	* This is the in core log item structure used to track information
	142	* needed to log buffers. It tracks how many times the lock has been
	143	* locked, and which 128 byte chunks of the buffer are dirty.
	144	*/
	145	typedef struct xfs_buf_log_item {
	146	xfs_log_item_t bli_item; /* common item structure */
	147	struct xfs_buf bli_buf; / real buffer pointer */
	148	unsigned int bli_flags; /* misc flags */
	149	unsigned int bli_recur; /* lock recursion count */
	150	atomic_t bli_refcount; /* cnt of tp refs */
372cc85e DC	151	int bli_format_count; /* count of headers */
372cc85e DC	152	struct xfs_buf_log_format bli_formats; / array of in-log header ptrs */
b9438173	153	struct xfs_buf_log_format __bli_format; /* embedded in-log header */
1da177e4 LT	154	} xfs_buf_log_item_t;
1da177e4 LT	155
1da177e4 LT	156	void xfs_buf_item_init(struct xfs_buf , struct xfs_mount );
	157	void xfs_buf_item_relse(struct xfs_buf *);
	158	void xfs_buf_item_log(xfs_buf_log_item_t *, uint, uint);
	159	uint xfs_buf_item_dirty(xfs_buf_log_item_t *);
	160	void xfs_buf_attach_iodone(struct xfs_buf *,
	161	void()(struct xfs_buf , xfs_log_item_t *),
	162	xfs_log_item_t *);
	163	void xfs_buf_iodone_callbacks(struct xfs_buf *);
ca30b2a7	164	void xfs_buf_iodone(struct xfs_buf , struct xfs_log_item );
1da177e4	165
61fe135c DC	166	void xfs_trans_buf_set_type(struct xfs_trans , struct xfs_buf ,
	167	enum xfs_blft);
	168	void xfs_trans_buf_copy_type(struct xfs_buf dst_bp, struct xfs_buf src_bp);
	169
1da177e4 LT	170	#endif /* __KERNEL__ */
	171
	172	#endif /* __XFS_BUF_ITEM_H__ */