summaryrefslogtreecommitdiff
path: root/fs/xfs/libxfs/xfs_inode_fork.h
blob: 781b1603df5e277687a06097111fb4cb2f99a25a (plain)
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
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
// SPDX-License-Identifier: GPL-2.0
/*
 * Copyright (c) 2000-2003,2005 Silicon Graphics, Inc.
 * All Rights Reserved.
 */
#ifndef	__XFS_INODE_FORK_H__
#define	__XFS_INODE_FORK_H__

struct xfs_inode_log_item;
struct xfs_dinode;

/*
 * File incore extent information, present for each of data & attr forks.
 */
typedef struct xfs_ifork {
	int			if_bytes;	/* bytes in if_u1 */
	int			if_real_bytes;	/* bytes allocated in if_u1 */
	struct xfs_btree_block	*if_broot;	/* file's incore btree root */
	short			if_broot_bytes;	/* bytes allocated for root */
	unsigned char		if_flags;	/* per-fork flags */
	int			if_height;	/* height of the extent tree */
	union {
		void		*if_root;	/* extent tree root */
		char		*if_data;	/* inline file data */
	} if_u1;
} xfs_ifork_t;

/*
 * Per-fork incore inode flags.
 */
#define	XFS_IFINLINE	0x01	/* Inline data is read in */
#define	XFS_IFEXTENTS	0x02	/* All extent pointers are read in */
#define	XFS_IFBROOT	0x04	/* i_broot points to the bmap b-tree root */

/*
 * Fork handling.
 */

#define XFS_IFORK_Q(ip)			((ip)->i_d.di_forkoff != 0)
#define XFS_IFORK_BOFF(ip)		((int)((ip)->i_d.di_forkoff << 3))

#define XFS_IFORK_PTR(ip,w)		\
	((w) == XFS_DATA_FORK ? \
		&(ip)->i_df : \
		((w) == XFS_ATTR_FORK ? \
			(ip)->i_afp : \
			(ip)->i_cowfp))
#define XFS_IFORK_DSIZE(ip) \
	(XFS_IFORK_Q(ip) ? \
		XFS_IFORK_BOFF(ip) : \
		XFS_LITINO((ip)->i_mount, (ip)->i_d.di_version))
#define XFS_IFORK_ASIZE(ip) \
	(XFS_IFORK_Q(ip) ? \
		XFS_LITINO((ip)->i_mount, (ip)->i_d.di_version) - \
			XFS_IFORK_BOFF(ip) : \
		0)
#define XFS_IFORK_SIZE(ip,w) \
	((w) == XFS_DATA_FORK ? \
		XFS_IFORK_DSIZE(ip) : \
		((w) == XFS_ATTR_FORK ? \
			XFS_IFORK_ASIZE(ip) : \
			0))
#define XFS_IFORK_FORMAT(ip,w) \
	((w) == XFS_DATA_FORK ? \
		(ip)->i_d.di_format : \
		((w) == XFS_ATTR_FORK ? \
			(ip)->i_d.di_aformat : \
			(ip)->i_cformat))
#define XFS_IFORK_FMT_SET(ip,w,n) \
	((w) == XFS_DATA_FORK ? \
		((ip)->i_d.di_format = (n)) : \
		((w) == XFS_ATTR_FORK ? \
			((ip)->i_d.di_aformat = (n)) : \
			((ip)->i_cformat = (n))))
#define XFS_IFORK_NEXTENTS(ip,w) \
	((w) == XFS_DATA_FORK ? \
		(ip)->i_d.di_nextents : \
		((w) == XFS_ATTR_FORK ? \
			(ip)->i_d.di_anextents : \
			(ip)->i_cnextents))
#define XFS_IFORK_NEXT_SET(ip,w,n) \
	((w) == XFS_DATA_FORK ? \
		((ip)->i_d.di_nextents = (n)) : \
		((w) == XFS_ATTR_FORK ? \
			((ip)->i_d.di_anextents = (n)) : \
			((ip)->i_cnextents = (n))))
#define XFS_IFORK_MAXEXT(ip, w) \
	(XFS_IFORK_SIZE(ip, w) / sizeof(xfs_bmbt_rec_t))

struct xfs_ifork *xfs_iext_state_to_fork(struct xfs_inode *ip, int state);

int		xfs_iformat_fork(struct xfs_inode *, struct xfs_dinode *);
void		xfs_iflush_fork(struct xfs_inode *, struct xfs_dinode *,
				struct xfs_inode_log_item *, int);
void		xfs_idestroy_fork(struct xfs_inode *, int);
void		xfs_idata_realloc(struct xfs_inode *, int, int);
void		xfs_iroot_realloc(struct xfs_inode *, int, int);
int		xfs_iread_extents(struct xfs_trans *, struct xfs_inode *, int);
int		xfs_iextents_copy(struct xfs_inode *, struct xfs_bmbt_rec *,
				  int);
void		xfs_init_local_fork(struct xfs_inode *, int, const void *, int);

xfs_extnum_t	xfs_iext_count(struct xfs_ifork *ifp);
void		xfs_iext_insert(struct xfs_inode *, struct xfs_iext_cursor *cur,
			struct xfs_bmbt_irec *, int);
void		xfs_iext_remove(struct xfs_inode *, struct xfs_iext_cursor *,
			int);
void		xfs_iext_destroy(struct xfs_ifork *);

bool		xfs_iext_lookup_extent(struct xfs_inode *ip,
			struct xfs_ifork *ifp, xfs_fileoff_t bno,
			struct xfs_iext_cursor *cur,
			struct xfs_bmbt_irec *gotp);
bool		xfs_iext_lookup_extent_before(struct xfs_inode *ip,
			struct xfs_ifork *ifp, xfs_fileoff_t *end,
			struct xfs_iext_cursor *cur,
			struct xfs_bmbt_irec *gotp);
bool		xfs_iext_get_extent(struct xfs_ifork *ifp,
			struct xfs_iext_cursor *cur,
			struct xfs_bmbt_irec *gotp);
void		xfs_iext_update_extent(struct xfs_inode *ip, int state,
			struct xfs_iext_cursor *cur,
			struct xfs_bmbt_irec *gotp);

void		xfs_iext_first(struct xfs_ifork *, struct xfs_iext_cursor *);
void		xfs_iext_last(struct xfs_ifork *, struct xfs_iext_cursor *);
void		xfs_iext_next(struct xfs_ifork *, struct xfs_iext_cursor *);
void		xfs_iext_prev(struct xfs_ifork *, struct xfs_iext_cursor *);

static inline bool xfs_iext_next_extent(struct xfs_ifork *ifp,
		struct xfs_iext_cursor *cur, struct xfs_bmbt_irec *gotp)
{
	xfs_iext_next(ifp, cur);
	return xfs_iext_get_extent(ifp, cur, gotp);
}

static inline bool xfs_iext_prev_extent(struct xfs_ifork *ifp,
		struct xfs_iext_cursor *cur, struct xfs_bmbt_irec *gotp)
{
	xfs_iext_prev(ifp, cur);
	return xfs_iext_get_extent(ifp, cur, gotp);
}

/*
 * Return the extent after cur in gotp without updating the cursor.
 */
static inline bool xfs_iext_peek_next_extent(struct xfs_ifork *ifp,
		struct xfs_iext_cursor *cur, struct xfs_bmbt_irec *gotp)
{
	struct xfs_iext_cursor ncur = *cur;

	xfs_iext_next(ifp, &ncur);
	return xfs_iext_get_extent(ifp, &ncur, gotp);
}

/*
 * Return the extent before cur in gotp without updating the cursor.
 */
static inline bool xfs_iext_peek_prev_extent(struct xfs_ifork *ifp,
		struct xfs_iext_cursor *cur, struct xfs_bmbt_irec *gotp)
{
	struct xfs_iext_cursor ncur = *cur;

	xfs_iext_prev(ifp, &ncur);
	return xfs_iext_get_extent(ifp, &ncur, gotp);
}

#define for_each_xfs_iext(ifp, ext, got)		\
	for (xfs_iext_first((ifp), (ext));		\
	     xfs_iext_get_extent((ifp), (ext), (got));	\
	     xfs_iext_next((ifp), (ext)))

extern struct kmem_zone	*xfs_ifork_zone;

extern void xfs_ifork_init_cow(struct xfs_inode *ip);

typedef xfs_failaddr_t (*xfs_ifork_verifier_t)(struct xfs_inode *);

struct xfs_ifork_ops {
	xfs_ifork_verifier_t	verify_symlink;
	xfs_ifork_verifier_t	verify_dir;
	xfs_ifork_verifier_t	verify_attr;
};
extern struct xfs_ifork_ops	xfs_default_ifork_ops;

xfs_failaddr_t xfs_ifork_verify_data(struct xfs_inode *ip,
		struct xfs_ifork_ops *ops);
xfs_failaddr_t xfs_ifork_verify_attr(struct xfs_inode *ip,
		struct xfs_ifork_ops *ops);

#endif	/* __XFS_INODE_FORK_H__ */