Loading...
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
21struct xfs_inode_log_item;
22struct xfs_dinode;
23
24/*
25 * File incore extent information, present for each of data & attr forks.
26 */
27typedef 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
102struct xfs_ifork *xfs_iext_state_to_fork(struct xfs_inode *ip, int state);
103
104int xfs_iformat_fork(struct xfs_inode *, struct xfs_dinode *);
105void xfs_iflush_fork(struct xfs_inode *, struct xfs_dinode *,
106 struct xfs_inode_log_item *, int);
107void xfs_idestroy_fork(struct xfs_inode *, int);
108void xfs_idata_realloc(struct xfs_inode *, int, int);
109void xfs_iroot_realloc(struct xfs_inode *, int, int);
110int xfs_iread_extents(struct xfs_trans *, struct xfs_inode *, int);
111int xfs_iextents_copy(struct xfs_inode *, struct xfs_bmbt_rec *,
112 int);
113void xfs_init_local_fork(struct xfs_inode *, int, const void *, int);
114
115xfs_extnum_t xfs_iext_count(struct xfs_ifork *ifp);
116void xfs_iext_insert(struct xfs_inode *, struct xfs_iext_cursor *cur,
117 struct xfs_bmbt_irec *, int);
118void xfs_iext_remove(struct xfs_inode *, struct xfs_iext_cursor *,
119 int);
120void xfs_iext_destroy(struct xfs_ifork *);
121
122bool 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);
126bool 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);
130bool xfs_iext_get_extent(struct xfs_ifork *ifp,
131 struct xfs_iext_cursor *cur,
132 struct xfs_bmbt_irec *gotp);
133void xfs_iext_update_extent(struct xfs_inode *ip, int state,
134 struct xfs_iext_cursor *cur,
135 struct xfs_bmbt_irec *gotp);
136
137void xfs_iext_first(struct xfs_ifork *, struct xfs_iext_cursor *);
138void xfs_iext_last(struct xfs_ifork *, struct xfs_iext_cursor *);
139void xfs_iext_next(struct xfs_ifork *, struct xfs_iext_cursor *);
140void xfs_iext_prev(struct xfs_ifork *, struct xfs_iext_cursor *);
141
142static 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
149static 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 */
159static 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 */
171static 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
185extern struct kmem_zone *xfs_ifork_zone;
186
187extern void xfs_ifork_init_cow(struct xfs_inode *ip);
188
189typedef xfs_failaddr_t (*xfs_ifork_verifier_t)(struct xfs_inode *);
190
191struct xfs_ifork_ops {
192 xfs_ifork_verifier_t verify_symlink;
193 xfs_ifork_verifier_t verify_dir;
194 xfs_ifork_verifier_t verify_attr;
195};
196extern struct xfs_ifork_ops xfs_default_ifork_ops;
197
198xfs_failaddr_t xfs_ifork_verify_data(struct xfs_inode *ip,
199 struct xfs_ifork_ops *ops);
200xfs_failaddr_t xfs_ifork_verify_attr(struct xfs_inode *ip,
201 struct xfs_ifork_ops *ops);
202
203#endif /* __XFS_INODE_FORK_H__ */
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
21struct xfs_inode_log_item;
22struct xfs_dinode;
23
24/*
25 * The following xfs_ext_irec_t struct introduces a second (top) level
26 * to the in-core extent allocation scheme. These structs are allocated
27 * in a contiguous block, creating an indirection array where each entry
28 * (irec) contains a pointer to a buffer of in-core extent records which
29 * it manages. Each extent buffer is 4k in size, since 4k is the system
30 * page size on Linux i386 and systems with larger page sizes don't seem
31 * to gain much, if anything, by using their native page size as the
32 * extent buffer size. Also, using 4k extent buffers everywhere provides
33 * a consistent interface for CXFS across different platforms.
34 *
35 * There is currently no limit on the number of irec's (extent lists)
36 * allowed, so heavily fragmented files may require an indirection array
37 * which spans multiple system pages of memory. The number of extents
38 * which would require this amount of contiguous memory is very large
39 * and should not cause problems in the foreseeable future. However,
40 * if the memory needed for the contiguous array ever becomes a problem,
41 * it is possible that a third level of indirection may be required.
42 */
43typedef struct xfs_ext_irec {
44 xfs_bmbt_rec_host_t *er_extbuf; /* block of extent records */
45 xfs_extnum_t er_extoff; /* extent offset in file */
46 xfs_extnum_t er_extcount; /* number of extents in page/block */
47} xfs_ext_irec_t;
48
49/*
50 * File incore extent information, present for each of data & attr forks.
51 */
52#define XFS_IEXT_BUFSZ 4096
53#define XFS_LINEAR_EXTS (XFS_IEXT_BUFSZ / (uint)sizeof(xfs_bmbt_rec_t))
54#define XFS_INLINE_EXTS 2
55#define XFS_INLINE_DATA 32
56typedef struct xfs_ifork {
57 int if_bytes; /* bytes in if_u1 */
58 int if_real_bytes; /* bytes allocated in if_u1 */
59 struct xfs_btree_block *if_broot; /* file's incore btree root */
60 short if_broot_bytes; /* bytes allocated for root */
61 unsigned char if_flags; /* per-fork flags */
62 union {
63 xfs_bmbt_rec_host_t *if_extents;/* linear map file exts */
64 xfs_ext_irec_t *if_ext_irec; /* irec map file exts */
65 char *if_data; /* inline file data */
66 } if_u1;
67 union {
68 xfs_bmbt_rec_host_t if_inline_ext[XFS_INLINE_EXTS];
69 /* very small file extents */
70 char if_inline_data[XFS_INLINE_DATA];
71 /* very small file data */
72 xfs_dev_t if_rdev; /* dev number if special */
73 uuid_t if_uuid; /* mount point value */
74 } if_u2;
75} xfs_ifork_t;
76
77/*
78 * Per-fork incore inode flags.
79 */
80#define XFS_IFINLINE 0x01 /* Inline data is read in */
81#define XFS_IFEXTENTS 0x02 /* All extent pointers are read in */
82#define XFS_IFBROOT 0x04 /* i_broot points to the bmap b-tree root */
83#define XFS_IFEXTIREC 0x08 /* Indirection array of extent blocks */
84
85/*
86 * Fork handling.
87 */
88
89#define XFS_IFORK_Q(ip) ((ip)->i_d.di_forkoff != 0)
90#define XFS_IFORK_BOFF(ip) ((int)((ip)->i_d.di_forkoff << 3))
91
92#define XFS_IFORK_PTR(ip,w) \
93 ((w) == XFS_DATA_FORK ? \
94 &(ip)->i_df : \
95 (ip)->i_afp)
96#define XFS_IFORK_DSIZE(ip) \
97 (XFS_IFORK_Q(ip) ? \
98 XFS_IFORK_BOFF(ip) : \
99 XFS_LITINO((ip)->i_mount, (ip)->i_d.di_version))
100#define XFS_IFORK_ASIZE(ip) \
101 (XFS_IFORK_Q(ip) ? \
102 XFS_LITINO((ip)->i_mount, (ip)->i_d.di_version) - \
103 XFS_IFORK_BOFF(ip) : \
104 0)
105#define XFS_IFORK_SIZE(ip,w) \
106 ((w) == XFS_DATA_FORK ? \
107 XFS_IFORK_DSIZE(ip) : \
108 XFS_IFORK_ASIZE(ip))
109#define XFS_IFORK_FORMAT(ip,w) \
110 ((w) == XFS_DATA_FORK ? \
111 (ip)->i_d.di_format : \
112 (ip)->i_d.di_aformat)
113#define XFS_IFORK_FMT_SET(ip,w,n) \
114 ((w) == XFS_DATA_FORK ? \
115 ((ip)->i_d.di_format = (n)) : \
116 ((ip)->i_d.di_aformat = (n)))
117#define XFS_IFORK_NEXTENTS(ip,w) \
118 ((w) == XFS_DATA_FORK ? \
119 (ip)->i_d.di_nextents : \
120 (ip)->i_d.di_anextents)
121#define XFS_IFORK_NEXT_SET(ip,w,n) \
122 ((w) == XFS_DATA_FORK ? \
123 ((ip)->i_d.di_nextents = (n)) : \
124 ((ip)->i_d.di_anextents = (n)))
125#define XFS_IFORK_MAXEXT(ip, w) \
126 (XFS_IFORK_SIZE(ip, w) / sizeof(xfs_bmbt_rec_t))
127
128int xfs_iformat_fork(struct xfs_inode *, struct xfs_dinode *);
129void xfs_iflush_fork(struct xfs_inode *, struct xfs_dinode *,
130 struct xfs_inode_log_item *, int);
131void xfs_idestroy_fork(struct xfs_inode *, int);
132void xfs_idata_realloc(struct xfs_inode *, int, int);
133void xfs_iroot_realloc(struct xfs_inode *, int, int);
134int xfs_iread_extents(struct xfs_trans *, struct xfs_inode *, int);
135int xfs_iextents_copy(struct xfs_inode *, struct xfs_bmbt_rec *,
136 int);
137
138struct xfs_bmbt_rec_host *
139 xfs_iext_get_ext(struct xfs_ifork *, xfs_extnum_t);
140void xfs_iext_insert(struct xfs_inode *, xfs_extnum_t, xfs_extnum_t,
141 struct xfs_bmbt_irec *, int);
142void xfs_iext_add(struct xfs_ifork *, xfs_extnum_t, int);
143void xfs_iext_add_indirect_multi(struct xfs_ifork *, int,
144 xfs_extnum_t, int);
145void xfs_iext_remove(struct xfs_inode *, xfs_extnum_t, int, int);
146void xfs_iext_remove_inline(struct xfs_ifork *, xfs_extnum_t, int);
147void xfs_iext_remove_direct(struct xfs_ifork *, xfs_extnum_t, int);
148void xfs_iext_remove_indirect(struct xfs_ifork *, xfs_extnum_t, int);
149void xfs_iext_realloc_direct(struct xfs_ifork *, int);
150void xfs_iext_direct_to_inline(struct xfs_ifork *, xfs_extnum_t);
151void xfs_iext_inline_to_direct(struct xfs_ifork *, int);
152void xfs_iext_destroy(struct xfs_ifork *);
153struct xfs_bmbt_rec_host *
154 xfs_iext_bno_to_ext(struct xfs_ifork *, xfs_fileoff_t, int *);
155struct xfs_ext_irec *
156 xfs_iext_bno_to_irec(struct xfs_ifork *, xfs_fileoff_t, int *);
157struct xfs_ext_irec *
158 xfs_iext_idx_to_irec(struct xfs_ifork *, xfs_extnum_t *, int *,
159 int);
160void xfs_iext_irec_init(struct xfs_ifork *);
161struct xfs_ext_irec *
162 xfs_iext_irec_new(struct xfs_ifork *, int);
163void xfs_iext_irec_remove(struct xfs_ifork *, int);
164void xfs_iext_irec_compact(struct xfs_ifork *);
165void xfs_iext_irec_compact_pages(struct xfs_ifork *);
166void xfs_iext_irec_compact_full(struct xfs_ifork *);
167void xfs_iext_irec_update_extoffs(struct xfs_ifork *, int, int);
168
169extern struct kmem_zone *xfs_ifork_zone;
170
171#endif /* __XFS_INODE_FORK_H__ */