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;		/* cow 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