1 |
1275 |
phoenix |
/*
|
2 |
|
|
* Copyright (c) 2000 Silicon Graphics, Inc. All Rights Reserved.
|
3 |
|
|
*
|
4 |
|
|
* This program is free software; you can redistribute it and/or modify it
|
5 |
|
|
* under the terms of version 2 of the GNU General Public License as
|
6 |
|
|
* published by the Free Software Foundation.
|
7 |
|
|
*
|
8 |
|
|
* This program is distributed in the hope that it would be useful, but
|
9 |
|
|
* WITHOUT ANY WARRANTY; without even the implied warranty of
|
10 |
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
|
11 |
|
|
*
|
12 |
|
|
* Further, this software is distributed without any warranty that it is
|
13 |
|
|
* free of the rightful claim of any third person regarding infringement
|
14 |
|
|
* or the like. Any license provided herein, whether implied or
|
15 |
|
|
* otherwise, applies only to this software file. Patent licenses, if
|
16 |
|
|
* any, provided herein do not apply to combinations of this program with
|
17 |
|
|
* other software, or any other product whatsoever.
|
18 |
|
|
*
|
19 |
|
|
* You should have received a copy of the GNU General Public License along
|
20 |
|
|
* with this program; if not, write the Free Software Foundation, Inc., 59
|
21 |
|
|
* Temple Place - Suite 330, Boston MA 02111-1307, USA.
|
22 |
|
|
*
|
23 |
|
|
* Contact information: Silicon Graphics, Inc., 1600 Amphitheatre Pkwy,
|
24 |
|
|
* Mountain View, CA 94043, or:
|
25 |
|
|
*
|
26 |
|
|
* http://www.sgi.com
|
27 |
|
|
*
|
28 |
|
|
* For further information regarding this notice, see:
|
29 |
|
|
*
|
30 |
|
|
* http://oss.sgi.com/projects/GenInfo/SGIGPLNoticeExplan/
|
31 |
|
|
*/
|
32 |
|
|
#ifndef __XFS_DIR2_DATA_H__
|
33 |
|
|
#define __XFS_DIR2_DATA_H__
|
34 |
|
|
|
35 |
|
|
/*
|
36 |
|
|
* Directory format 2, data block structures.
|
37 |
|
|
*/
|
38 |
|
|
|
39 |
|
|
struct xfs_dabuf;
|
40 |
|
|
struct xfs_da_args;
|
41 |
|
|
struct xfs_inode;
|
42 |
|
|
struct xfs_trans;
|
43 |
|
|
|
44 |
|
|
/*
|
45 |
|
|
* Constants.
|
46 |
|
|
*/
|
47 |
|
|
#define XFS_DIR2_DATA_MAGIC 0x58443244 /* XD2D: for multiblock dirs */
|
48 |
|
|
#define XFS_DIR2_DATA_ALIGN_LOG 3 /* i.e., 8 bytes */
|
49 |
|
|
#define XFS_DIR2_DATA_ALIGN (1 << XFS_DIR2_DATA_ALIGN_LOG)
|
50 |
|
|
#define XFS_DIR2_DATA_FREE_TAG 0xffff
|
51 |
|
|
#define XFS_DIR2_DATA_FD_COUNT 3
|
52 |
|
|
|
53 |
|
|
/*
|
54 |
|
|
* Directory address space divided into sections,
|
55 |
|
|
* spaces separated by 32gb.
|
56 |
|
|
*/
|
57 |
|
|
#define XFS_DIR2_SPACE_SIZE (1ULL << (32 + XFS_DIR2_DATA_ALIGN_LOG))
|
58 |
|
|
#define XFS_DIR2_DATA_SPACE 0
|
59 |
|
|
#define XFS_DIR2_DATA_OFFSET (XFS_DIR2_DATA_SPACE * XFS_DIR2_SPACE_SIZE)
|
60 |
|
|
#define XFS_DIR2_DATA_FIRSTDB(mp) \
|
61 |
|
|
XFS_DIR2_BYTE_TO_DB(mp, XFS_DIR2_DATA_OFFSET)
|
62 |
|
|
|
63 |
|
|
/*
|
64 |
|
|
* Offsets of . and .. in data space (always block 0)
|
65 |
|
|
*/
|
66 |
|
|
#define XFS_DIR2_DATA_DOT_OFFSET \
|
67 |
|
|
((xfs_dir2_data_aoff_t)sizeof(xfs_dir2_data_hdr_t))
|
68 |
|
|
#define XFS_DIR2_DATA_DOTDOT_OFFSET \
|
69 |
|
|
(XFS_DIR2_DATA_DOT_OFFSET + XFS_DIR2_DATA_ENTSIZE(1))
|
70 |
|
|
#define XFS_DIR2_DATA_FIRST_OFFSET \
|
71 |
|
|
(XFS_DIR2_DATA_DOTDOT_OFFSET + XFS_DIR2_DATA_ENTSIZE(2))
|
72 |
|
|
|
73 |
|
|
/*
|
74 |
|
|
* Structures.
|
75 |
|
|
*/
|
76 |
|
|
|
77 |
|
|
/*
|
78 |
|
|
* Describe a free area in the data block.
|
79 |
|
|
* The freespace will be formatted as a xfs_dir2_data_unused_t.
|
80 |
|
|
*/
|
81 |
|
|
typedef struct xfs_dir2_data_free {
|
82 |
|
|
xfs_dir2_data_off_t offset; /* start of freespace */
|
83 |
|
|
xfs_dir2_data_off_t length; /* length of freespace */
|
84 |
|
|
} xfs_dir2_data_free_t;
|
85 |
|
|
|
86 |
|
|
/*
|
87 |
|
|
* Header for the data blocks.
|
88 |
|
|
* Always at the beginning of a directory-sized block.
|
89 |
|
|
* The code knows that XFS_DIR2_DATA_FD_COUNT is 3.
|
90 |
|
|
*/
|
91 |
|
|
typedef struct xfs_dir2_data_hdr {
|
92 |
|
|
__uint32_t magic; /* XFS_DIR2_DATA_MAGIC */
|
93 |
|
|
/* or XFS_DIR2_BLOCK_MAGIC */
|
94 |
|
|
xfs_dir2_data_free_t bestfree[XFS_DIR2_DATA_FD_COUNT];
|
95 |
|
|
} xfs_dir2_data_hdr_t;
|
96 |
|
|
|
97 |
|
|
/*
|
98 |
|
|
* Active entry in a data block. Aligned to 8 bytes.
|
99 |
|
|
* Tag appears as the last 2 bytes.
|
100 |
|
|
*/
|
101 |
|
|
typedef struct xfs_dir2_data_entry {
|
102 |
|
|
xfs_ino_t inumber; /* inode number */
|
103 |
|
|
__uint8_t namelen; /* name length */
|
104 |
|
|
__uint8_t name[1]; /* name bytes, no null */
|
105 |
|
|
/* variable offset */
|
106 |
|
|
xfs_dir2_data_off_t tag; /* starting offset of us */
|
107 |
|
|
} xfs_dir2_data_entry_t;
|
108 |
|
|
|
109 |
|
|
/*
|
110 |
|
|
* Unused entry in a data block. Aligned to 8 bytes.
|
111 |
|
|
* Tag appears as the last 2 bytes.
|
112 |
|
|
*/
|
113 |
|
|
typedef struct xfs_dir2_data_unused {
|
114 |
|
|
__uint16_t freetag; /* XFS_DIR2_DATA_FREE_TAG */
|
115 |
|
|
xfs_dir2_data_off_t length; /* total free length */
|
116 |
|
|
/* variable offset */
|
117 |
|
|
xfs_dir2_data_off_t tag; /* starting offset of us */
|
118 |
|
|
} xfs_dir2_data_unused_t;
|
119 |
|
|
|
120 |
|
|
typedef union {
|
121 |
|
|
xfs_dir2_data_entry_t entry;
|
122 |
|
|
xfs_dir2_data_unused_t unused;
|
123 |
|
|
} xfs_dir2_data_union_t;
|
124 |
|
|
|
125 |
|
|
/*
|
126 |
|
|
* Generic data block structure, for xfs_db.
|
127 |
|
|
*/
|
128 |
|
|
typedef struct xfs_dir2_data {
|
129 |
|
|
xfs_dir2_data_hdr_t hdr; /* magic XFS_DIR2_DATA_MAGIC */
|
130 |
|
|
xfs_dir2_data_union_t u[1];
|
131 |
|
|
} xfs_dir2_data_t;
|
132 |
|
|
|
133 |
|
|
/*
|
134 |
|
|
* Macros.
|
135 |
|
|
*/
|
136 |
|
|
|
137 |
|
|
/*
|
138 |
|
|
* Size of a data entry.
|
139 |
|
|
*/
|
140 |
|
|
#if XFS_WANT_FUNCS || (XFS_WANT_SPACE && XFSSO_XFS_DIR2_DATA_ENTSIZE)
|
141 |
|
|
int xfs_dir2_data_entsize(int n);
|
142 |
|
|
#define XFS_DIR2_DATA_ENTSIZE(n) xfs_dir2_data_entsize(n)
|
143 |
|
|
#else
|
144 |
|
|
#define XFS_DIR2_DATA_ENTSIZE(n) \
|
145 |
|
|
((int)(roundup(offsetof(xfs_dir2_data_entry_t, name[0]) + (n) + \
|
146 |
|
|
(uint)sizeof(xfs_dir2_data_off_t), XFS_DIR2_DATA_ALIGN)))
|
147 |
|
|
#endif
|
148 |
|
|
|
149 |
|
|
/*
|
150 |
|
|
* Pointer to an entry's tag word.
|
151 |
|
|
*/
|
152 |
|
|
#if XFS_WANT_FUNCS || (XFS_WANT_SPACE && XFSSO_XFS_DIR2_DATA_ENTRY_TAG_P)
|
153 |
|
|
xfs_dir2_data_off_t *xfs_dir2_data_entry_tag_p(xfs_dir2_data_entry_t *dep);
|
154 |
|
|
#define XFS_DIR2_DATA_ENTRY_TAG_P(dep) xfs_dir2_data_entry_tag_p(dep)
|
155 |
|
|
#else
|
156 |
|
|
#define XFS_DIR2_DATA_ENTRY_TAG_P(dep) \
|
157 |
|
|
((xfs_dir2_data_off_t *)\
|
158 |
|
|
((char *)(dep) + XFS_DIR2_DATA_ENTSIZE((dep)->namelen) - \
|
159 |
|
|
(uint)sizeof(xfs_dir2_data_off_t)))
|
160 |
|
|
#endif
|
161 |
|
|
|
162 |
|
|
/*
|
163 |
|
|
* Pointer to a freespace's tag word.
|
164 |
|
|
*/
|
165 |
|
|
#if XFS_WANT_FUNCS || (XFS_WANT_SPACE && XFSSO_XFS_DIR2_DATA_UNUSED_TAG_P)
|
166 |
|
|
xfs_dir2_data_off_t *xfs_dir2_data_unused_tag_p_arch(
|
167 |
|
|
xfs_dir2_data_unused_t *dup, xfs_arch_t arch);
|
168 |
|
|
#define XFS_DIR2_DATA_UNUSED_TAG_P_ARCH(dup,arch) \
|
169 |
|
|
xfs_dir2_data_unused_tag_p_arch(dup,arch)
|
170 |
|
|
#else
|
171 |
|
|
#define XFS_DIR2_DATA_UNUSED_TAG_P_ARCH(dup,arch) \
|
172 |
|
|
((xfs_dir2_data_off_t *)\
|
173 |
|
|
((char *)(dup) + INT_GET((dup)->length, arch) \
|
174 |
|
|
- (uint)sizeof(xfs_dir2_data_off_t)))
|
175 |
|
|
#endif
|
176 |
|
|
|
177 |
|
|
/*
|
178 |
|
|
* Function declarations.
|
179 |
|
|
*/
|
180 |
|
|
|
181 |
|
|
#ifdef DEBUG
|
182 |
|
|
extern void
|
183 |
|
|
xfs_dir2_data_check(struct xfs_inode *dp, struct xfs_dabuf *bp);
|
184 |
|
|
#else
|
185 |
|
|
#define xfs_dir2_data_check(dp,bp)
|
186 |
|
|
#endif
|
187 |
|
|
|
188 |
|
|
extern xfs_dir2_data_free_t *
|
189 |
|
|
xfs_dir2_data_freefind(xfs_dir2_data_t *d,
|
190 |
|
|
xfs_dir2_data_unused_t *dup);
|
191 |
|
|
|
192 |
|
|
extern xfs_dir2_data_free_t *
|
193 |
|
|
xfs_dir2_data_freeinsert(xfs_dir2_data_t *d,
|
194 |
|
|
xfs_dir2_data_unused_t *dup, int *loghead);
|
195 |
|
|
|
196 |
|
|
extern void
|
197 |
|
|
xfs_dir2_data_freeremove(xfs_dir2_data_t *d,
|
198 |
|
|
xfs_dir2_data_free_t *dfp, int *loghead);
|
199 |
|
|
|
200 |
|
|
extern void
|
201 |
|
|
xfs_dir2_data_freescan(struct xfs_mount *mp, xfs_dir2_data_t *d,
|
202 |
|
|
int *loghead, char *aendp);
|
203 |
|
|
|
204 |
|
|
extern int
|
205 |
|
|
xfs_dir2_data_init(struct xfs_da_args *args, xfs_dir2_db_t blkno,
|
206 |
|
|
struct xfs_dabuf **bpp);
|
207 |
|
|
|
208 |
|
|
extern void
|
209 |
|
|
xfs_dir2_data_log_entry(struct xfs_trans *tp, struct xfs_dabuf *bp,
|
210 |
|
|
xfs_dir2_data_entry_t *dep);
|
211 |
|
|
|
212 |
|
|
extern void
|
213 |
|
|
xfs_dir2_data_log_header(struct xfs_trans *tp, struct xfs_dabuf *bp);
|
214 |
|
|
|
215 |
|
|
extern void
|
216 |
|
|
xfs_dir2_data_log_unused(struct xfs_trans *tp, struct xfs_dabuf *bp,
|
217 |
|
|
xfs_dir2_data_unused_t *dup);
|
218 |
|
|
|
219 |
|
|
extern void
|
220 |
|
|
xfs_dir2_data_make_free(struct xfs_trans *tp, struct xfs_dabuf *bp,
|
221 |
|
|
xfs_dir2_data_aoff_t offset,
|
222 |
|
|
xfs_dir2_data_aoff_t len, int *needlogp,
|
223 |
|
|
int *needscanp);
|
224 |
|
|
|
225 |
|
|
extern void
|
226 |
|
|
xfs_dir2_data_use_free(struct xfs_trans *tp, struct xfs_dabuf *bp,
|
227 |
|
|
xfs_dir2_data_unused_t *dup,
|
228 |
|
|
xfs_dir2_data_aoff_t offset,
|
229 |
|
|
xfs_dir2_data_aoff_t len, int *needlogp,
|
230 |
|
|
int *needscanp);
|
231 |
|
|
|
232 |
|
|
#endif /* __XFS_DIR2_DATA_H__ */
|