xref: /openbmc/linux/fs/xfs/libxfs/xfs_inode_fork.h (revision 68198dca)
1 /*
2  * Copyright (c) 2000-2003,2005 Silicon Graphics, Inc.
3  * All Rights Reserved.
4  *
5  * This program is free software; you can redistribute it and/or
6  * modify it under the terms of the GNU General Public License as
7  * published by the Free Software Foundation.
8  *
9  * This program is distributed in the hope that it would be useful,
10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
12  * GNU General Public License for more details.
13  *
14  * You should have received a copy of the GNU General Public License
15  * along with this program; if not, write the Free Software Foundation,
16  * Inc.,  51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
17  */
18 #ifndef	__XFS_INODE_FORK_H__
19 #define	__XFS_INODE_FORK_H__
20 
21 struct xfs_inode_log_item;
22 struct xfs_dinode;
23 
24 /*
25  * File incore extent information, present for each of data & attr forks.
26  */
27 typedef struct xfs_ifork {
28 	int			if_bytes;	/* bytes in if_u1 */
29 	int			if_real_bytes;	/* bytes allocated in if_u1 */
30 	struct xfs_btree_block	*if_broot;	/* file's incore btree root */
31 	short			if_broot_bytes;	/* bytes allocated for root */
32 	unsigned char		if_flags;	/* per-fork flags */
33 	int			if_height;	/* height of the extent tree */
34 	union {
35 		void		*if_root;	/* extent tree root */
36 		char		*if_data;	/* inline file data */
37 	} if_u1;
38 } xfs_ifork_t;
39 
40 /*
41  * Per-fork incore inode flags.
42  */
43 #define	XFS_IFINLINE	0x01	/* Inline data is read in */
44 #define	XFS_IFEXTENTS	0x02	/* All extent pointers are read in */
45 #define	XFS_IFBROOT	0x04	/* i_broot points to the bmap b-tree root */
46 
47 /*
48  * Fork handling.
49  */
50 
51 #define XFS_IFORK_Q(ip)			((ip)->i_d.di_forkoff != 0)
52 #define XFS_IFORK_BOFF(ip)		((int)((ip)->i_d.di_forkoff << 3))
53 
54 #define XFS_IFORK_PTR(ip,w)		\
55 	((w) == XFS_DATA_FORK ? \
56 		&(ip)->i_df : \
57 		((w) == XFS_ATTR_FORK ? \
58 			(ip)->i_afp : \
59 			(ip)->i_cowfp))
60 #define XFS_IFORK_DSIZE(ip) \
61 	(XFS_IFORK_Q(ip) ? \
62 		XFS_IFORK_BOFF(ip) : \
63 		XFS_LITINO((ip)->i_mount, (ip)->i_d.di_version))
64 #define XFS_IFORK_ASIZE(ip) \
65 	(XFS_IFORK_Q(ip) ? \
66 		XFS_LITINO((ip)->i_mount, (ip)->i_d.di_version) - \
67 			XFS_IFORK_BOFF(ip) : \
68 		0)
69 #define XFS_IFORK_SIZE(ip,w) \
70 	((w) == XFS_DATA_FORK ? \
71 		XFS_IFORK_DSIZE(ip) : \
72 		((w) == XFS_ATTR_FORK ? \
73 			XFS_IFORK_ASIZE(ip) : \
74 			0))
75 #define XFS_IFORK_FORMAT(ip,w) \
76 	((w) == XFS_DATA_FORK ? \
77 		(ip)->i_d.di_format : \
78 		((w) == XFS_ATTR_FORK ? \
79 			(ip)->i_d.di_aformat : \
80 			(ip)->i_cformat))
81 #define XFS_IFORK_FMT_SET(ip,w,n) \
82 	((w) == XFS_DATA_FORK ? \
83 		((ip)->i_d.di_format = (n)) : \
84 		((w) == XFS_ATTR_FORK ? \
85 			((ip)->i_d.di_aformat = (n)) : \
86 			((ip)->i_cformat = (n))))
87 #define XFS_IFORK_NEXTENTS(ip,w) \
88 	((w) == XFS_DATA_FORK ? \
89 		(ip)->i_d.di_nextents : \
90 		((w) == XFS_ATTR_FORK ? \
91 			(ip)->i_d.di_anextents : \
92 			(ip)->i_cnextents))
93 #define XFS_IFORK_NEXT_SET(ip,w,n) \
94 	((w) == XFS_DATA_FORK ? \
95 		((ip)->i_d.di_nextents = (n)) : \
96 		((w) == XFS_ATTR_FORK ? \
97 			((ip)->i_d.di_anextents = (n)) : \
98 			((ip)->i_cnextents = (n))))
99 #define XFS_IFORK_MAXEXT(ip, w) \
100 	(XFS_IFORK_SIZE(ip, w) / sizeof(xfs_bmbt_rec_t))
101 
102 struct xfs_ifork *xfs_iext_state_to_fork(struct xfs_inode *ip, int state);
103 
104 int		xfs_iformat_fork(struct xfs_inode *, struct xfs_dinode *);
105 void		xfs_iflush_fork(struct xfs_inode *, struct xfs_dinode *,
106 				struct xfs_inode_log_item *, int);
107 void		xfs_idestroy_fork(struct xfs_inode *, int);
108 void		xfs_idata_realloc(struct xfs_inode *, int, int);
109 void		xfs_iroot_realloc(struct xfs_inode *, int, int);
110 int		xfs_iread_extents(struct xfs_trans *, struct xfs_inode *, int);
111 int		xfs_iextents_copy(struct xfs_inode *, struct xfs_bmbt_rec *,
112 				  int);
113 void		xfs_init_local_fork(struct xfs_inode *, int, const void *, int);
114 
115 xfs_extnum_t	xfs_iext_count(struct xfs_ifork *ifp);
116 void		xfs_iext_insert(struct xfs_inode *, struct xfs_iext_cursor *cur,
117 			struct xfs_bmbt_irec *, int);
118 void		xfs_iext_remove(struct xfs_inode *, struct xfs_iext_cursor *,
119 			int);
120 void		xfs_iext_destroy(struct xfs_ifork *);
121 
122 bool		xfs_iext_lookup_extent(struct xfs_inode *ip,
123 			struct xfs_ifork *ifp, xfs_fileoff_t bno,
124 			struct xfs_iext_cursor *cur,
125 			struct xfs_bmbt_irec *gotp);
126 bool		xfs_iext_lookup_extent_before(struct xfs_inode *ip,
127 			struct xfs_ifork *ifp, xfs_fileoff_t *end,
128 			struct xfs_iext_cursor *cur,
129 			struct xfs_bmbt_irec *gotp);
130 bool		xfs_iext_get_extent(struct xfs_ifork *ifp,
131 			struct xfs_iext_cursor *cur,
132 			struct xfs_bmbt_irec *gotp);
133 void		xfs_iext_update_extent(struct xfs_inode *ip, int state,
134 			struct xfs_iext_cursor *cur,
135 			struct xfs_bmbt_irec *gotp);
136 
137 void		xfs_iext_first(struct xfs_ifork *, struct xfs_iext_cursor *);
138 void		xfs_iext_last(struct xfs_ifork *, struct xfs_iext_cursor *);
139 void		xfs_iext_next(struct xfs_ifork *, struct xfs_iext_cursor *);
140 void		xfs_iext_prev(struct xfs_ifork *, struct xfs_iext_cursor *);
141 
142 static inline bool xfs_iext_next_extent(struct xfs_ifork *ifp,
143 		struct xfs_iext_cursor *cur, struct xfs_bmbt_irec *gotp)
144 {
145 	xfs_iext_next(ifp, cur);
146 	return xfs_iext_get_extent(ifp, cur, gotp);
147 }
148 
149 static inline bool xfs_iext_prev_extent(struct xfs_ifork *ifp,
150 		struct xfs_iext_cursor *cur, struct xfs_bmbt_irec *gotp)
151 {
152 	xfs_iext_prev(ifp, cur);
153 	return xfs_iext_get_extent(ifp, cur, gotp);
154 }
155 
156 /*
157  * Return the extent after cur in gotp without updating the cursor.
158  */
159 static inline bool xfs_iext_peek_next_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_next(ifp, &ncur);
165 	return xfs_iext_get_extent(ifp, &ncur, gotp);
166 }
167 
168 /*
169  * Return the extent before cur in gotp without updating the cursor.
170  */
171 static inline bool xfs_iext_peek_prev_extent(struct xfs_ifork *ifp,
172 		struct xfs_iext_cursor *cur, struct xfs_bmbt_irec *gotp)
173 {
174 	struct xfs_iext_cursor ncur = *cur;
175 
176 	xfs_iext_prev(ifp, &ncur);
177 	return xfs_iext_get_extent(ifp, &ncur, gotp);
178 }
179 
180 #define for_each_xfs_iext(ifp, ext, got)		\
181 	for (xfs_iext_first((ifp), (ext));		\
182 	     xfs_iext_get_extent((ifp), (ext), (got));	\
183 	     xfs_iext_next((ifp), (ext)))
184 
185 extern struct kmem_zone	*xfs_ifork_zone;
186 
187 extern void xfs_ifork_init_cow(struct xfs_inode *ip);
188 
189 #endif	/* __XFS_INODE_FORK_H__ */
190