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 int64_t if_bytes; /* bytes in if_u1 */
17 struct xfs_btree_block *if_broot; /* file's incore btree root */
18 unsigned int if_seq; /* fork mod counter */
19 int if_height; /* height of the extent tree */
20 union {
21 void *if_root; /* extent tree root */
22 char *if_data; /* inline file data */
23 } if_u1;
24 short if_broot_bytes; /* bytes allocated for root */
25 unsigned char if_flags; /* per-fork flags */
26 int8_t if_format; /* format of this fork */
27 xfs_extnum_t if_nextents; /* # of extents in this fork */
28 };
29
30 /*
31 * Per-fork incore inode flags.
32 */
33 #define XFS_IFINLINE 0x01 /* Inline data is read in */
34 #define XFS_IFEXTENTS 0x02 /* All extent pointers are read in */
35 #define XFS_IFBROOT 0x04 /* i_broot points to the bmap b-tree root */
36
37 /*
38 * Fork handling.
39 */
40
41 #define XFS_IFORK_Q(ip) ((ip)->i_d.di_forkoff != 0)
42 #define XFS_IFORK_BOFF(ip) ((int)((ip)->i_d.di_forkoff << 3))
43
44 #define XFS_IFORK_PTR(ip,w) \
45 ((w) == XFS_DATA_FORK ? \
46 &(ip)->i_df : \
47 ((w) == XFS_ATTR_FORK ? \
48 (ip)->i_afp : \
49 (ip)->i_cowfp))
50 #define XFS_IFORK_DSIZE(ip) \
51 (XFS_IFORK_Q(ip) ? XFS_IFORK_BOFF(ip) : XFS_LITINO((ip)->i_mount))
52 #define XFS_IFORK_ASIZE(ip) \
53 (XFS_IFORK_Q(ip) ? XFS_LITINO((ip)->i_mount) - XFS_IFORK_BOFF(ip) : 0)
54 #define XFS_IFORK_SIZE(ip,w) \
55 ((w) == XFS_DATA_FORK ? \
56 XFS_IFORK_DSIZE(ip) : \
57 ((w) == XFS_ATTR_FORK ? \
58 XFS_IFORK_ASIZE(ip) : \
59 0))
60 #define XFS_IFORK_MAXEXT(ip, w) \
61 (XFS_IFORK_SIZE(ip, w) / sizeof(xfs_bmbt_rec_t))
62
xfs_ifork_has_extents(struct xfs_ifork * ifp)63 static inline bool xfs_ifork_has_extents(struct xfs_ifork *ifp)
64 {
65 return ifp->if_format == XFS_DINODE_FMT_EXTENTS ||
66 ifp->if_format == XFS_DINODE_FMT_BTREE;
67 }
68
xfs_ifork_nextents(struct xfs_ifork * ifp)69 static inline xfs_extnum_t xfs_ifork_nextents(struct xfs_ifork *ifp)
70 {
71 if (!ifp)
72 return 0;
73 return ifp->if_nextents;
74 }
75
xfs_ifork_format(struct xfs_ifork * ifp)76 static inline int8_t xfs_ifork_format(struct xfs_ifork *ifp)
77 {
78 if (!ifp)
79 return XFS_DINODE_FMT_EXTENTS;
80 return ifp->if_format;
81 }
82
83 struct xfs_ifork *xfs_iext_state_to_fork(struct xfs_inode *ip, int state);
84
85 int xfs_iformat_data_fork(struct xfs_inode *, struct xfs_dinode *);
86 int xfs_iformat_attr_fork(struct xfs_inode *, struct xfs_dinode *);
87 void xfs_iflush_fork(struct xfs_inode *, struct xfs_dinode *,
88 struct xfs_inode_log_item *, int);
89 void xfs_idestroy_fork(struct xfs_ifork *ifp);
90 void xfs_idata_realloc(struct xfs_inode *ip, int64_t byte_diff,
91 int whichfork);
92 void xfs_iroot_realloc(struct xfs_inode *, int, int);
93 int xfs_iread_extents(struct xfs_trans *, struct xfs_inode *, int);
94 int xfs_iextents_copy(struct xfs_inode *, struct xfs_bmbt_rec *,
95 int);
96 void xfs_init_local_fork(struct xfs_inode *ip, int whichfork,
97 const void *data, int64_t size);
98
99 xfs_extnum_t xfs_iext_count(struct xfs_ifork *ifp);
100 void xfs_iext_insert(struct xfs_inode *, struct xfs_iext_cursor *cur,
101 struct xfs_bmbt_irec *, int);
102 void xfs_iext_remove(struct xfs_inode *, struct xfs_iext_cursor *,
103 int);
104 void xfs_iext_destroy(struct xfs_ifork *);
105
106 bool xfs_iext_lookup_extent(struct xfs_inode *ip,
107 struct xfs_ifork *ifp, xfs_fileoff_t bno,
108 struct xfs_iext_cursor *cur,
109 struct xfs_bmbt_irec *gotp);
110 bool xfs_iext_lookup_extent_before(struct xfs_inode *ip,
111 struct xfs_ifork *ifp, xfs_fileoff_t *end,
112 struct xfs_iext_cursor *cur,
113 struct xfs_bmbt_irec *gotp);
114 bool xfs_iext_get_extent(struct xfs_ifork *ifp,
115 struct xfs_iext_cursor *cur,
116 struct xfs_bmbt_irec *gotp);
117 void xfs_iext_update_extent(struct xfs_inode *ip, int state,
118 struct xfs_iext_cursor *cur,
119 struct xfs_bmbt_irec *gotp);
120
121 void xfs_iext_first(struct xfs_ifork *, struct xfs_iext_cursor *);
122 void xfs_iext_last(struct xfs_ifork *, struct xfs_iext_cursor *);
123 void xfs_iext_next(struct xfs_ifork *, struct xfs_iext_cursor *);
124 void xfs_iext_prev(struct xfs_ifork *, struct xfs_iext_cursor *);
125
xfs_iext_next_extent(struct xfs_ifork * ifp,struct xfs_iext_cursor * cur,struct xfs_bmbt_irec * gotp)126 static inline bool xfs_iext_next_extent(struct xfs_ifork *ifp,
127 struct xfs_iext_cursor *cur, struct xfs_bmbt_irec *gotp)
128 {
129 xfs_iext_next(ifp, cur);
130 return xfs_iext_get_extent(ifp, cur, gotp);
131 }
132
xfs_iext_prev_extent(struct xfs_ifork * ifp,struct xfs_iext_cursor * cur,struct xfs_bmbt_irec * gotp)133 static inline bool xfs_iext_prev_extent(struct xfs_ifork *ifp,
134 struct xfs_iext_cursor *cur, struct xfs_bmbt_irec *gotp)
135 {
136 xfs_iext_prev(ifp, cur);
137 return xfs_iext_get_extent(ifp, cur, gotp);
138 }
139
140 /*
141 * Return the extent after cur in gotp without updating the cursor.
142 */
xfs_iext_peek_next_extent(struct xfs_ifork * ifp,struct xfs_iext_cursor * cur,struct xfs_bmbt_irec * gotp)143 static inline bool xfs_iext_peek_next_extent(struct xfs_ifork *ifp,
144 struct xfs_iext_cursor *cur, struct xfs_bmbt_irec *gotp)
145 {
146 struct xfs_iext_cursor ncur = *cur;
147
148 xfs_iext_next(ifp, &ncur);
149 return xfs_iext_get_extent(ifp, &ncur, gotp);
150 }
151
152 /*
153 * Return the extent before cur in gotp without updating the cursor.
154 */
xfs_iext_peek_prev_extent(struct xfs_ifork * ifp,struct xfs_iext_cursor * cur,struct xfs_bmbt_irec * gotp)155 static inline bool xfs_iext_peek_prev_extent(struct xfs_ifork *ifp,
156 struct xfs_iext_cursor *cur, struct xfs_bmbt_irec *gotp)
157 {
158 struct xfs_iext_cursor ncur = *cur;
159
160 xfs_iext_prev(ifp, &ncur);
161 return xfs_iext_get_extent(ifp, &ncur, gotp);
162 }
163
164 #define for_each_xfs_iext(ifp, ext, got) \
165 for (xfs_iext_first((ifp), (ext)); \
166 xfs_iext_get_extent((ifp), (ext), (got)); \
167 xfs_iext_next((ifp), (ext)))
168
169 extern struct kmem_zone *xfs_ifork_zone;
170
171 extern void xfs_ifork_init_cow(struct xfs_inode *ip);
172
173 int xfs_ifork_verify_local_data(struct xfs_inode *ip);
174 int xfs_ifork_verify_local_attr(struct xfs_inode *ip);
175
176 #endif /* __XFS_INODE_FORK_H__ */
177