aboutsummaryrefslogtreecommitdiffstats
path: root/fs/xfs/xfs_buf_item.h
blob: 0f1c247dc680031fe06554a4bd41f6f962290a53 (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
/*
 * 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_ORDERED		0x80

#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" }, \
	{ XFS_BLI_ORDERED,	"ORDERED" }


#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__ */