1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
|
/*
* Copyright (c) 2000-2001,2005 Silicon Graphics, Inc.
* All Rights Reserved.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation.
*
* This program is distributed in the hope that it would be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
#ifndef __XFS_DIR2_H__
#define __XFS_DIR2_H__
#include "xfs_da_format.h"
#include "xfs_da_btree.h"
struct xfs_defer_ops;
struct xfs_da_args;
struct xfs_inode;
struct xfs_mount;
struct xfs_trans;
struct xfs_dir2_sf_hdr;
struct xfs_dir2_sf_entry;
struct xfs_dir2_data_hdr;
struct xfs_dir2_data_entry;
struct xfs_dir2_data_unused;
extern struct xfs_name xfs_name_dotdot;
/*
* Convert inode mode to directory entry filetype
*/
extern unsigned char xfs_mode_to_ftype(int mode);
/*
* directory operations vector for encode/decode routines
*/
struct xfs_dir_ops {
int (*sf_entsize)(struct xfs_dir2_sf_hdr *hdr, int len);
struct xfs_dir2_sf_entry *
(*sf_nextentry)(struct xfs_dir2_sf_hdr *hdr,
struct xfs_dir2_sf_entry *sfep);
uint8_t (*sf_get_ftype)(struct xfs_dir2_sf_entry *sfep);
void (*sf_put_ftype)(struct xfs_dir2_sf_entry *sfep,
uint8_t ftype);
xfs_ino_t (*sf_get_ino)(struct xfs_dir2_sf_hdr *hdr,
struct xfs_dir2_sf_entry *sfep);
void (*sf_put_ino)(struct xfs_dir2_sf_hdr *hdr,
struct xfs_dir2_sf_entry *sfep,
xfs_ino_t ino);
xfs_ino_t (*sf_get_parent_ino)(struct xfs_dir2_sf_hdr *hdr);
void (*sf_put_parent_ino)(struct xfs_dir2_sf_hdr *hdr,
xfs_ino_t ino);
int (*data_entsize)(int len);
uint8_t (*data_get_ftype)(struct xfs_dir2_data_entry *dep);
void (*data_put_ftype)(struct xfs_dir2_data_entry *dep,
uint8_t ftype);
__be16 * (*data_entry_tag_p)(struct xfs_dir2_data_entry *dep);
struct xfs_dir2_data_free *
(*data_bestfree_p)(struct xfs_dir2_data_hdr *hdr);
xfs_dir2_data_aoff_t data_dot_offset;
xfs_dir2_data_aoff_t data_dotdot_offset;
xfs_dir2_data_aoff_t data_first_offset;
size_t data_entry_offset;
struct xfs_dir2_data_entry *
(*data_dot_entry_p)(struct xfs_dir2_data_hdr *hdr);
struct xfs_dir2_data_entry *
(*data_dotdot_entry_p)(struct xfs_dir2_data_hdr *hdr);
struct xfs_dir2_data_entry *
(*data_first_entry_p)(struct xfs_dir2_data_hdr *hdr);
struct xfs_dir2_data_entry *
(*data_entry_p)(struct xfs_dir2_data_hdr *hdr);
struct xfs_dir2_data_unused *
(*data_unused_p)(struct xfs_dir2_data_hdr *hdr);
int leaf_hdr_size;
void (*leaf_hdr_to_disk)(struct xfs_dir2_leaf *to,
struct xfs_dir3_icleaf_hdr *from);
void (*leaf_hdr_from_disk)(struct xfs_dir3_icleaf_hdr *to,
struct xfs_dir2_leaf *from);
int (*leaf_max_ents)(struct xfs_da_geometry *geo);
struct xfs_dir2_leaf_entry *
(*leaf_ents_p)(struct xfs_dir2_leaf *lp);
int node_hdr_size;
void (*node_hdr_to_disk)(struct xfs_da_intnode *to,
struct xfs_da3_icnode_hdr *from);
void (*node_hdr_from_disk)(struct xfs_da3_icnode_hdr *to,
struct xfs_da_intnode *from);
struct xfs_da_node_entry *
(*node_tree_p)(struct xfs_da_intnode *dap);
int free_hdr_size;
void (*free_hdr_to_disk)(struct xfs_dir2_free *to,
struct xfs_dir3_icfree_hdr *from);
void (*free_hdr_from_disk)(struct xfs_dir3_icfree_hdr *to,
struct xfs_dir2_free *from);
int (*free_max_bests)(struct xfs_da_geometry *geo);
__be16 * (*free_bests_p)(struct xfs_dir2_free *free);
xfs_dir2_db_t (*db_to_fdb)(struct xfs_da_geometry *geo,
xfs_dir2_db_t db);
int (*db_to_fdindex)(struct xfs_da_geometry *geo,
xfs_dir2_db_t db);
};
extern const struct xfs_dir_ops *
xfs_dir_get_ops(struct xfs_mount *mp, struct xfs_inode *dp);
extern const struct xfs_dir_ops *
xfs_nondir_get_ops(struct xfs_mount *mp, struct xfs_inode *dp);
/*
* Generic directory interface routines
*/
extern void xfs_dir_startup(void);
extern int xfs_da_mount(struct xfs_mount *mp);
extern void xfs_da_unmount(struct xfs_mount *mp);
extern int xfs_dir_isempty(struct xfs_inode *dp);
extern int xfs_dir_init(struct xfs_trans *tp, struct xfs_inode *dp,
struct xfs_inode *pdp);
extern int xfs_dir_createname(struct xfs_trans *tp, struct xfs_inode *dp,
struct xfs_name *name, xfs_ino_t inum,
xfs_fsblock_t *first,
struct xfs_defer_ops *dfops, xfs_extlen_t tot);
extern int xfs_dir_lookup(struct xfs_trans *tp, struct xfs_inode *dp,
struct xfs_name *name, xfs_ino_t *inum,
struct xfs_name *ci_name);
extern int xfs_dir_removename(struct xfs_trans *tp, struct xfs_inode *dp,
struct xfs_name *name, xfs_ino_t ino,
xfs_fsblock_t *first,
struct xfs_defer_ops *dfops, xfs_extlen_t tot);
extern int xfs_dir_replace(struct xfs_trans *tp, struct xfs_inode *dp,
struct xfs_name *name, xfs_ino_t inum,
xfs_fsblock_t *first,
struct xfs_defer_ops *dfops, xfs_extlen_t tot);
extern int xfs_dir_canenter(struct xfs_trans *tp, struct xfs_inode *dp,
struct xfs_name *name);
/*
* Direct call from the bmap code, bypassing the generic directory layer.
*/
extern int xfs_dir2_sf_to_block(struct xfs_da_args *args);
/*
* Interface routines used by userspace utilities
*/
extern int xfs_dir2_isblock(struct xfs_da_args *args, int *r);
extern int xfs_dir2_isleaf(struct xfs_da_args *args, int *r);
extern int xfs_dir2_shrink_inode(struct xfs_da_args *args, xfs_dir2_db_t db,
struct xfs_buf *bp);
extern void xfs_dir2_data_freescan_int(struct xfs_da_geometry *geo,
const struct xfs_dir_ops *ops,
struct xfs_dir2_data_hdr *hdr, int *loghead);
extern void xfs_dir2_data_freescan(struct xfs_inode *dp,
struct xfs_dir2_data_hdr *hdr, int *loghead);
extern void xfs_dir2_data_log_entry(struct xfs_da_args *args,
struct xfs_buf *bp, struct xfs_dir2_data_entry *dep);
extern void xfs_dir2_data_log_header(struct xfs_da_args *args,
struct xfs_buf *bp);
extern void xfs_dir2_data_log_unused(struct xfs_da_args *args,
struct xfs_buf *bp, struct xfs_dir2_data_unused *dup);
extern void xfs_dir2_data_make_free(struct xfs_da_args *args,
struct xfs_buf *bp, xfs_dir2_data_aoff_t offset,
xfs_dir2_data_aoff_t len, int *needlogp, int *needscanp);
extern int xfs_dir2_data_use_free(struct xfs_da_args *args,
struct xfs_buf *bp, struct xfs_dir2_data_unused *dup,
xfs_dir2_data_aoff_t offset, xfs_dir2_data_aoff_t len,
int *needlogp, int *needscanp);
extern struct xfs_dir2_data_free *xfs_dir2_data_freefind(
struct xfs_dir2_data_hdr *hdr, struct xfs_dir2_data_free *bf,
struct xfs_dir2_data_unused *dup);
extern int xfs_dir_ino_validate(struct xfs_mount *mp, xfs_ino_t ino);
extern const struct xfs_buf_ops xfs_dir3_block_buf_ops;
extern const struct xfs_buf_ops xfs_dir3_leafn_buf_ops;
extern const struct xfs_buf_ops xfs_dir3_leaf1_buf_ops;
extern const struct xfs_buf_ops xfs_dir3_free_buf_ops;
extern const struct xfs_buf_ops xfs_dir3_data_buf_ops;
/*
* Directory offset/block conversion functions.
*
* DB blocks here are logical directory block numbers, not filesystem blocks.
*/
/*
* Convert dataptr to byte in file space
*/
static inline xfs_dir2_off_t
xfs_dir2_dataptr_to_byte(xfs_dir2_dataptr_t dp)
{
return (xfs_dir2_off_t)dp << XFS_DIR2_DATA_ALIGN_LOG;
}
/*
* Convert byte in file space to dataptr. It had better be aligned.
*/
static inline xfs_dir2_dataptr_t
xfs_dir2_byte_to_dataptr(xfs_dir2_off_t by)
{
return (xfs_dir2_dataptr_t)(by >> XFS_DIR2_DATA_ALIGN_LOG);
}
/*
* Convert byte in space to (DB) block
*/
static inline xfs_dir2_db_t
xfs_dir2_byte_to_db(struct xfs_da_geometry *geo, xfs_dir2_off_t by)
{
return (xfs_dir2_db_t)(by >> geo->blklog);
}
/*
* Convert dataptr to a block number
*/
static inline xfs_dir2_db_t
xfs_dir2_dataptr_to_db(struct xfs_da_geometry *geo, xfs_dir2_dataptr_t dp)
{
return xfs_dir2_byte_to_db(geo, xfs_dir2_dataptr_to_byte(dp));
}
/*
* Convert byte in space to offset in a block
*/
static inline xfs_dir2_data_aoff_t
xfs_dir2_byte_to_off(struct xfs_da_geometry *geo, xfs_dir2_off_t by)
{
return (xfs_dir2_data_aoff_t)(by & (geo->blksize - 1));
}
/*
* Convert dataptr to a byte offset in a block
*/
static inline xfs_dir2_data_aoff_t
xfs_dir2_dataptr_to_off(struct xfs_da_geometry *geo, xfs_dir2_dataptr_t dp)
{
return xfs_dir2_byte_to_off(geo, xfs_dir2_dataptr_to_byte(dp));
}
/*
* Convert block and offset to byte in space
*/
static inline xfs_dir2_off_t
xfs_dir2_db_off_to_byte(struct xfs_da_geometry *geo, xfs_dir2_db_t db,
xfs_dir2_data_aoff_t o)
{
return ((xfs_dir2_off_t)db << geo->blklog) + o;
}
/*
* Convert block (DB) to block (dablk)
*/
static inline xfs_dablk_t
xfs_dir2_db_to_da(struct xfs_da_geometry *geo, xfs_dir2_db_t db)
{
return (xfs_dablk_t)(db << (geo->blklog - geo->fsblog));
}
/*
* Convert byte in space to (DA) block
*/
static inline xfs_dablk_t
xfs_dir2_byte_to_da(struct xfs_da_geometry *geo, xfs_dir2_off_t by)
{
return xfs_dir2_db_to_da(geo, xfs_dir2_byte_to_db(geo, by));
}
/*
* Convert block and offset to dataptr
*/
static inline xfs_dir2_dataptr_t
xfs_dir2_db_off_to_dataptr(struct xfs_da_geometry *geo, xfs_dir2_db_t db,
xfs_dir2_data_aoff_t o)
{
return xfs_dir2_byte_to_dataptr(xfs_dir2_db_off_to_byte(geo, db, o));
}
/*
* Convert block (dablk) to block (DB)
*/
static inline xfs_dir2_db_t
xfs_dir2_da_to_db(struct xfs_da_geometry *geo, xfs_dablk_t da)
{
return (xfs_dir2_db_t)(da >> (geo->blklog - geo->fsblog));
}
/*
* Convert block (dablk) to byte offset in space
*/
static inline xfs_dir2_off_t
xfs_dir2_da_to_byte(struct xfs_da_geometry *geo, xfs_dablk_t da)
{
return xfs_dir2_db_off_to_byte(geo, xfs_dir2_da_to_db(geo, da), 0);
}
/*
* Directory tail pointer accessor functions. Based on block geometry.
*/
static inline struct xfs_dir2_block_tail *
xfs_dir2_block_tail_p(struct xfs_da_geometry *geo, struct xfs_dir2_data_hdr *hdr)
{
return ((struct xfs_dir2_block_tail *)
((char *)hdr + geo->blksize)) - 1;
}
static inline struct xfs_dir2_leaf_tail *
xfs_dir2_leaf_tail_p(struct xfs_da_geometry *geo, struct xfs_dir2_leaf *lp)
{
return (struct xfs_dir2_leaf_tail *)
((char *)lp + geo->blksize -
sizeof(struct xfs_dir2_leaf_tail));
}
/*
* The Linux API doesn't pass down the total size of the buffer
* we read into down to the filesystem. With the filldir concept
* it's not needed for correct information, but the XFS dir2 leaf
* code wants an estimate of the buffer size to calculate it's
* readahead window and size the buffers used for mapping to
* physical blocks.
*
* Try to give it an estimate that's good enough, maybe at some
* point we can change the ->readdir prototype to include the
* buffer size. For now we use the current glibc buffer size.
* musl libc hardcodes 2k and dietlibc uses PAGE_SIZE.
*/
#define XFS_READDIR_BUFSIZE (32768)
unsigned char xfs_dir3_get_dtype(struct xfs_mount *mp, uint8_t filetype);
void *xfs_dir3_data_endp(struct xfs_da_geometry *geo,
struct xfs_dir2_data_hdr *hdr);
#endif /* __XFS_DIR2_H__ */
|
