1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * Copyright (c) 2000-2003,2005 Silicon Graphics, Inc.
4 * All Rights Reserved.
5 */
6 #ifndef __XFS_INODE_FORK_H__
7 #define __XFS_INODE_FORK_H__
8
9 struct xfs_inode_log_item;
10 struct xfs_dinode;
11
12 /*
13 * File incore extent information, present for each of data & attr forks.
14 */
15 struct xfs_ifork {
16 int if_bytes; /* bytes in if_u1 */
17 unsigned int if_seq; /* fork mod counter */
18 struct xfs_btree_block *if_broot; /* file's incore btree root */
19 short if_broot_bytes; /* bytes allocated for root */
20 unsigned char if_flags; /* per-fork flags */
21 int if_height; /* height of the extent tree */
22 union {
23 void *if_root; /* extent tree root */
24 char *if_data; /* inline file data */
25 } if_u1;
26 };
27
28 /*
29 * Per-fork incore inode flags.
30 */
31 #define XFS_IFINLINE 0x01 /* Inline data is read in */
32 #define XFS_IFEXTENTS 0x02 /* All extent pointers are read in */
33 #define XFS_IFBROOT 0x04 /* i_broot points to the bmap b-tree root */
34
35 /*
36 * Fork handling.
37 */
38
39 #define XFS_IFORK_Q(ip) ((ip)->i_d.di_forkoff != 0)
40 #define XFS_IFORK_BOFF(ip) ((int)((ip)->i_d.di_forkoff << 3))
41
42 #define XFS_IFORK_PTR(ip,w) \
43 ((w) == XFS_DATA_FORK ? \
44 &(ip)->i_df : \
45 ((w) == XFS_ATTR_FORK ? \
46 (ip)->i_afp : \
47 (ip)->i_cowfp))
48 #define XFS_IFORK_DSIZE(ip) \
49 (XFS_IFORK_Q(ip) ? \
50 XFS_IFORK_BOFF(ip) : \
51 XFS_LITINO((ip)->i_mount, (ip)->i_d.di_version))
52 #define XFS_IFORK_ASIZE(ip) \
53 (XFS_IFORK_Q(ip) ? \
54 XFS_LITINO((ip)->i_mount, (ip)->i_d.di_version) - \
55 XFS_IFORK_BOFF(ip) : \
56 0)
57 #define XFS_IFORK_SIZE(ip,w) \
58 ((w) == XFS_DATA_FORK ? \
59 XFS_IFORK_DSIZE(ip) : \
60 ((w) == XFS_ATTR_FORK ? \
61 XFS_IFORK_ASIZE(ip) : \
62 0))
63 #define XFS_IFORK_FORMAT(ip,w) \
64 ((w) == XFS_DATA_FORK ? \
65 (ip)->i_d.di_format : \
66 ((w) == XFS_ATTR_FORK ? \
67 (ip)->i_d.di_aformat : \
68 (ip)->i_cformat))
69 #define XFS_IFORK_FMT_SET(ip,w,n) \
70 ((w) == XFS_DATA_FORK ? \
71 ((ip)->i_d.di_format = (n)) : \
72 ((w) == XFS_ATTR_FORK ? \
73 ((ip)->i_d.di_aformat = (n)) : \
74 ((ip)->i_cformat = (n))))
75 #define XFS_IFORK_NEXTENTS(ip,w) \
76 ((w) == XFS_DATA_FORK ? \
77 (ip)->i_d.di_nextents : \
78 ((w) == XFS_ATTR_FORK ? \
79 (ip)->i_d.di_anextents : \
80 (ip)->i_cnextents))
81 #define XFS_IFORK_NEXT_SET(ip,w,n) \
82 ((w) == XFS_DATA_FORK ? \
83 ((ip)->i_d.di_nextents = (n)) : \
84 ((w) == XFS_ATTR_FORK ? \
85 ((ip)->i_d.di_anextents = (n)) : \
86 ((ip)->i_cnextents = (n))))
87 #define XFS_IFORK_MAXEXT(ip, w) \
88 (XFS_IFORK_SIZE(ip, w) / sizeof(xfs_bmbt_rec_t))
89
90 struct xfs_ifork *xfs_iext_state_to_fork(struct xfs_inode *ip, int state);
91
92 int xfs_iformat_fork(struct xfs_inode *, struct xfs_dinode *);
93 void xfs_iflush_fork(struct xfs_inode *, struct xfs_dinode *,
94 struct xfs_inode_log_item *, int);
95 void xfs_idestroy_fork(struct xfs_inode *, int);
96 void xfs_idata_realloc(struct xfs_inode *, int, int);
97 void xfs_iroot_realloc(struct xfs_inode *, int, int);
98 int xfs_iread_extents(struct xfs_trans *, struct xfs_inode *, int);
99 int xfs_iextents_copy(struct xfs_inode *, struct xfs_bmbt_rec *,
100 int);
101 void xfs_init_local_fork(struct xfs_inode *, int, const void *, int);
102
103 xfs_extnum_t xfs_iext_count(struct xfs_ifork *ifp);
104 void xfs_iext_insert(struct xfs_inode *, struct xfs_iext_cursor *cur,
105 struct xfs_bmbt_irec *, int);
106 void xfs_iext_remove(struct xfs_inode *, struct xfs_iext_cursor *,
107 int);
108 void xfs_iext_destroy(struct xfs_ifork *);
109
110 bool xfs_iext_lookup_extent(struct xfs_inode *ip,
111 struct xfs_ifork *ifp, xfs_fileoff_t bno,
112 struct xfs_iext_cursor *cur,
113 struct xfs_bmbt_irec *gotp);
114 bool xfs_iext_lookup_extent_before(struct xfs_inode *ip,
115 struct xfs_ifork *ifp, xfs_fileoff_t *end,
116 struct xfs_iext_cursor *cur,
117 struct xfs_bmbt_irec *gotp);
118 bool xfs_iext_get_extent(struct xfs_ifork *ifp,
119 struct xfs_iext_cursor *cur,
120 struct xfs_bmbt_irec *gotp);
121 void xfs_iext_update_extent(struct xfs_inode *ip, int state,
122 struct xfs_iext_cursor *cur,
123 struct xfs_bmbt_irec *gotp);
124
125 void xfs_iext_first(struct xfs_ifork *, struct xfs_iext_cursor *);
126 void xfs_iext_last(struct xfs_ifork *, struct xfs_iext_cursor *);
127 void xfs_iext_next(struct xfs_ifork *, struct xfs_iext_cursor *);
128 void xfs_iext_prev(struct xfs_ifork *, struct xfs_iext_cursor *);
129
xfs_iext_next_extent(struct xfs_ifork * ifp,struct xfs_iext_cursor * cur,struct xfs_bmbt_irec * gotp)130 static inline bool xfs_iext_next_extent(struct xfs_ifork *ifp,
131 struct xfs_iext_cursor *cur, struct xfs_bmbt_irec *gotp)
132 {
133 xfs_iext_next(ifp, cur);
134 return xfs_iext_get_extent(ifp, cur, gotp);
135 }
136
xfs_iext_prev_extent(struct xfs_ifork * ifp,struct xfs_iext_cursor * cur,struct xfs_bmbt_irec * gotp)137 static inline bool xfs_iext_prev_extent(struct xfs_ifork *ifp,
138 struct xfs_iext_cursor *cur, struct xfs_bmbt_irec *gotp)
139 {
140 xfs_iext_prev(ifp, cur);
141 return xfs_iext_get_extent(ifp, cur, gotp);
142 }
143
144 /*
145 * Return the extent after cur in gotp without updating the cursor.
146 */
xfs_iext_peek_next_extent(struct xfs_ifork * ifp,struct xfs_iext_cursor * cur,struct xfs_bmbt_irec * gotp)147 static inline bool xfs_iext_peek_next_extent(struct xfs_ifork *ifp,
148 struct xfs_iext_cursor *cur, struct xfs_bmbt_irec *gotp)
149 {
150 struct xfs_iext_cursor ncur = *cur;
151
152 xfs_iext_next(ifp, &ncur);
153 return xfs_iext_get_extent(ifp, &ncur, gotp);
154 }
155
156 /*
157 * Return the extent before cur in gotp without updating the cursor.
158 */
xfs_iext_peek_prev_extent(struct xfs_ifork * ifp,struct xfs_iext_cursor * cur,struct xfs_bmbt_irec * gotp)159 static inline bool xfs_iext_peek_prev_extent(struct xfs_ifork *ifp,
160 struct xfs_iext_cursor *cur, struct xfs_bmbt_irec *gotp)
161 {
162 struct xfs_iext_cursor ncur = *cur;
163
164 xfs_iext_prev(ifp, &ncur);
165 return xfs_iext_get_extent(ifp, &ncur, gotp);
166 }
167
168 #define for_each_xfs_iext(ifp, ext, got) \
169 for (xfs_iext_first((ifp), (ext)); \
170 xfs_iext_get_extent((ifp), (ext), (got)); \
171 xfs_iext_next((ifp), (ext)))
172
173 extern struct kmem_zone *xfs_ifork_zone;
174
175 extern void xfs_ifork_init_cow(struct xfs_inode *ip);
176
177 typedef xfs_failaddr_t (*xfs_ifork_verifier_t)(struct xfs_inode *);
178
179 struct xfs_ifork_ops {
180 xfs_ifork_verifier_t verify_symlink;
181 xfs_ifork_verifier_t verify_dir;
182 xfs_ifork_verifier_t verify_attr;
183 };
184 extern struct xfs_ifork_ops xfs_default_ifork_ops;
185
186 xfs_failaddr_t xfs_ifork_verify_data(struct xfs_inode *ip,
187 struct xfs_ifork_ops *ops);
188 xfs_failaddr_t xfs_ifork_verify_attr(struct xfs_inode *ip,
189 struct xfs_ifork_ops *ops);
190
191 #endif /* __XFS_INODE_FORK_H__ */
192
