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1/*
2 * Copyright (c) 2000-2001,2005 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_DIR2_H__
19#define __XFS_DIR2_H__
20
21struct xfs_bmap_free;
22struct xfs_da_args;
23struct xfs_inode;
24struct xfs_mount;
25struct xfs_trans;
26struct xfs_dir2_sf_hdr;
27struct xfs_dir2_sf_entry;
28struct xfs_dir2_data_hdr;
29struct xfs_dir2_data_entry;
30struct xfs_dir2_data_unused;
31
32extern struct xfs_name xfs_name_dotdot;
33
34/*
35 * directory filetype conversion tables.
36 */
37#define S_SHIFT 12
38extern const unsigned char xfs_mode_to_ftype[];
39
40/*
41 * directory operations vector for encode/decode routines
42 */
43struct xfs_dir_ops {
44 int (*sf_entsize)(struct xfs_dir2_sf_hdr *hdr, int len);
45 struct xfs_dir2_sf_entry *
46 (*sf_nextentry)(struct xfs_dir2_sf_hdr *hdr,
47 struct xfs_dir2_sf_entry *sfep);
48 __uint8_t (*sf_get_ftype)(struct xfs_dir2_sf_entry *sfep);
49 void (*sf_put_ftype)(struct xfs_dir2_sf_entry *sfep,
50 __uint8_t ftype);
51 xfs_ino_t (*sf_get_ino)(struct xfs_dir2_sf_hdr *hdr,
52 struct xfs_dir2_sf_entry *sfep);
53 void (*sf_put_ino)(struct xfs_dir2_sf_hdr *hdr,
54 struct xfs_dir2_sf_entry *sfep,
55 xfs_ino_t ino);
56 xfs_ino_t (*sf_get_parent_ino)(struct xfs_dir2_sf_hdr *hdr);
57 void (*sf_put_parent_ino)(struct xfs_dir2_sf_hdr *hdr,
58 xfs_ino_t ino);
59
60 int (*data_entsize)(int len);
61 __uint8_t (*data_get_ftype)(struct xfs_dir2_data_entry *dep);
62 void (*data_put_ftype)(struct xfs_dir2_data_entry *dep,
63 __uint8_t ftype);
64 __be16 * (*data_entry_tag_p)(struct xfs_dir2_data_entry *dep);
65 struct xfs_dir2_data_free *
66 (*data_bestfree_p)(struct xfs_dir2_data_hdr *hdr);
67
68 xfs_dir2_data_aoff_t data_dot_offset;
69 xfs_dir2_data_aoff_t data_dotdot_offset;
70 xfs_dir2_data_aoff_t data_first_offset;
71 size_t data_entry_offset;
72
73 struct xfs_dir2_data_entry *
74 (*data_dot_entry_p)(struct xfs_dir2_data_hdr *hdr);
75 struct xfs_dir2_data_entry *
76 (*data_dotdot_entry_p)(struct xfs_dir2_data_hdr *hdr);
77 struct xfs_dir2_data_entry *
78 (*data_first_entry_p)(struct xfs_dir2_data_hdr *hdr);
79 struct xfs_dir2_data_entry *
80 (*data_entry_p)(struct xfs_dir2_data_hdr *hdr);
81 struct xfs_dir2_data_unused *
82 (*data_unused_p)(struct xfs_dir2_data_hdr *hdr);
83
84 int leaf_hdr_size;
85 void (*leaf_hdr_to_disk)(struct xfs_dir2_leaf *to,
86 struct xfs_dir3_icleaf_hdr *from);
87 void (*leaf_hdr_from_disk)(struct xfs_dir3_icleaf_hdr *to,
88 struct xfs_dir2_leaf *from);
89 int (*leaf_max_ents)(struct xfs_da_geometry *geo);
90 struct xfs_dir2_leaf_entry *
91 (*leaf_ents_p)(struct xfs_dir2_leaf *lp);
92
93 int node_hdr_size;
94 void (*node_hdr_to_disk)(struct xfs_da_intnode *to,
95 struct xfs_da3_icnode_hdr *from);
96 void (*node_hdr_from_disk)(struct xfs_da3_icnode_hdr *to,
97 struct xfs_da_intnode *from);
98 struct xfs_da_node_entry *
99 (*node_tree_p)(struct xfs_da_intnode *dap);
100
101 int free_hdr_size;
102 void (*free_hdr_to_disk)(struct xfs_dir2_free *to,
103 struct xfs_dir3_icfree_hdr *from);
104 void (*free_hdr_from_disk)(struct xfs_dir3_icfree_hdr *to,
105 struct xfs_dir2_free *from);
106 int (*free_max_bests)(struct xfs_da_geometry *geo);
107 __be16 * (*free_bests_p)(struct xfs_dir2_free *free);
108 xfs_dir2_db_t (*db_to_fdb)(struct xfs_da_geometry *geo,
109 xfs_dir2_db_t db);
110 int (*db_to_fdindex)(struct xfs_da_geometry *geo,
111 xfs_dir2_db_t db);
112};
113
114extern const struct xfs_dir_ops *
115 xfs_dir_get_ops(struct xfs_mount *mp, struct xfs_inode *dp);
116extern const struct xfs_dir_ops *
117 xfs_nondir_get_ops(struct xfs_mount *mp, struct xfs_inode *dp);
118
119/*
120 * Generic directory interface routines
121 */
122extern void xfs_dir_startup(void);
123extern int xfs_da_mount(struct xfs_mount *mp);
124extern void xfs_da_unmount(struct xfs_mount *mp);
125
126extern int xfs_dir_isempty(struct xfs_inode *dp);
127extern int xfs_dir_init(struct xfs_trans *tp, struct xfs_inode *dp,
128 struct xfs_inode *pdp);
129extern int xfs_dir_createname(struct xfs_trans *tp, struct xfs_inode *dp,
130 struct xfs_name *name, xfs_ino_t inum,
131 xfs_fsblock_t *first,
132 struct xfs_bmap_free *flist, xfs_extlen_t tot);
133extern int xfs_dir_lookup(struct xfs_trans *tp, struct xfs_inode *dp,
134 struct xfs_name *name, xfs_ino_t *inum,
135 struct xfs_name *ci_name);
136extern int xfs_dir_removename(struct xfs_trans *tp, struct xfs_inode *dp,
137 struct xfs_name *name, xfs_ino_t ino,
138 xfs_fsblock_t *first,
139 struct xfs_bmap_free *flist, xfs_extlen_t tot);
140extern int xfs_dir_replace(struct xfs_trans *tp, struct xfs_inode *dp,
141 struct xfs_name *name, xfs_ino_t inum,
142 xfs_fsblock_t *first,
143 struct xfs_bmap_free *flist, xfs_extlen_t tot);
144extern int xfs_dir_canenter(struct xfs_trans *tp, struct xfs_inode *dp,
145 struct xfs_name *name);
146
147/*
148 * Direct call from the bmap code, bypassing the generic directory layer.
149 */
150extern int xfs_dir2_sf_to_block(struct xfs_da_args *args);
151
152/*
153 * Interface routines used by userspace utilities
154 */
155extern int xfs_dir2_isblock(struct xfs_da_args *args, int *r);
156extern int xfs_dir2_isleaf(struct xfs_da_args *args, int *r);
157extern int xfs_dir2_shrink_inode(struct xfs_da_args *args, xfs_dir2_db_t db,
158 struct xfs_buf *bp);
159
160extern void xfs_dir2_data_freescan(struct xfs_inode *dp,
161 struct xfs_dir2_data_hdr *hdr, int *loghead);
162extern void xfs_dir2_data_log_entry(struct xfs_da_args *args,
163 struct xfs_buf *bp, struct xfs_dir2_data_entry *dep);
164extern void xfs_dir2_data_log_header(struct xfs_da_args *args,
165 struct xfs_buf *bp);
166extern void xfs_dir2_data_log_unused(struct xfs_da_args *args,
167 struct xfs_buf *bp, struct xfs_dir2_data_unused *dup);
168extern void xfs_dir2_data_make_free(struct xfs_da_args *args,
169 struct xfs_buf *bp, xfs_dir2_data_aoff_t offset,
170 xfs_dir2_data_aoff_t len, int *needlogp, int *needscanp);
171extern void xfs_dir2_data_use_free(struct xfs_da_args *args,
172 struct xfs_buf *bp, struct xfs_dir2_data_unused *dup,
173 xfs_dir2_data_aoff_t offset, xfs_dir2_data_aoff_t len,
174 int *needlogp, int *needscanp);
175
176extern struct xfs_dir2_data_free *xfs_dir2_data_freefind(
177 struct xfs_dir2_data_hdr *hdr, struct xfs_dir2_data_free *bf,
178 struct xfs_dir2_data_unused *dup);
179
180extern const struct xfs_buf_ops xfs_dir3_block_buf_ops;
181extern const struct xfs_buf_ops xfs_dir3_leafn_buf_ops;
182extern const struct xfs_buf_ops xfs_dir3_leaf1_buf_ops;
183extern const struct xfs_buf_ops xfs_dir3_free_buf_ops;
184extern const struct xfs_buf_ops xfs_dir3_data_buf_ops;
185
186/*
187 * Directory offset/block conversion functions.
188 *
189 * DB blocks here are logical directory block numbers, not filesystem blocks.
190 */
191
192/*
193 * Convert dataptr to byte in file space
194 */
195static inline xfs_dir2_off_t
196xfs_dir2_dataptr_to_byte(xfs_dir2_dataptr_t dp)
197{
198 return (xfs_dir2_off_t)dp << XFS_DIR2_DATA_ALIGN_LOG;
199}
200
201/*
202 * Convert byte in file space to dataptr. It had better be aligned.
203 */
204static inline xfs_dir2_dataptr_t
205xfs_dir2_byte_to_dataptr(xfs_dir2_off_t by)
206{
207 return (xfs_dir2_dataptr_t)(by >> XFS_DIR2_DATA_ALIGN_LOG);
208}
209
210/*
211 * Convert byte in space to (DB) block
212 */
213static inline xfs_dir2_db_t
214xfs_dir2_byte_to_db(struct xfs_da_geometry *geo, xfs_dir2_off_t by)
215{
216 return (xfs_dir2_db_t)(by >> geo->blklog);
217}
218
219/*
220 * Convert dataptr to a block number
221 */
222static inline xfs_dir2_db_t
223xfs_dir2_dataptr_to_db(struct xfs_da_geometry *geo, xfs_dir2_dataptr_t dp)
224{
225 return xfs_dir2_byte_to_db(geo, xfs_dir2_dataptr_to_byte(dp));
226}
227
228/*
229 * Convert byte in space to offset in a block
230 */
231static inline xfs_dir2_data_aoff_t
232xfs_dir2_byte_to_off(struct xfs_da_geometry *geo, xfs_dir2_off_t by)
233{
234 return (xfs_dir2_data_aoff_t)(by & (geo->blksize - 1));
235}
236
237/*
238 * Convert dataptr to a byte offset in a block
239 */
240static inline xfs_dir2_data_aoff_t
241xfs_dir2_dataptr_to_off(struct xfs_da_geometry *geo, xfs_dir2_dataptr_t dp)
242{
243 return xfs_dir2_byte_to_off(geo, xfs_dir2_dataptr_to_byte(dp));
244}
245
246/*
247 * Convert block and offset to byte in space
248 */
249static inline xfs_dir2_off_t
250xfs_dir2_db_off_to_byte(struct xfs_da_geometry *geo, xfs_dir2_db_t db,
251 xfs_dir2_data_aoff_t o)
252{
253 return ((xfs_dir2_off_t)db << geo->blklog) + o;
254}
255
256/*
257 * Convert block (DB) to block (dablk)
258 */
259static inline xfs_dablk_t
260xfs_dir2_db_to_da(struct xfs_da_geometry *geo, xfs_dir2_db_t db)
261{
262 return (xfs_dablk_t)(db << (geo->blklog - geo->fsblog));
263}
264
265/*
266 * Convert byte in space to (DA) block
267 */
268static inline xfs_dablk_t
269xfs_dir2_byte_to_da(struct xfs_da_geometry *geo, xfs_dir2_off_t by)
270{
271 return xfs_dir2_db_to_da(geo, xfs_dir2_byte_to_db(geo, by));
272}
273
274/*
275 * Convert block and offset to dataptr
276 */
277static inline xfs_dir2_dataptr_t
278xfs_dir2_db_off_to_dataptr(struct xfs_da_geometry *geo, xfs_dir2_db_t db,
279 xfs_dir2_data_aoff_t o)
280{
281 return xfs_dir2_byte_to_dataptr(xfs_dir2_db_off_to_byte(geo, db, o));
282}
283
284/*
285 * Convert block (dablk) to block (DB)
286 */
287static inline xfs_dir2_db_t
288xfs_dir2_da_to_db(struct xfs_da_geometry *geo, xfs_dablk_t da)
289{
290 return (xfs_dir2_db_t)(da >> (geo->blklog - geo->fsblog));
291}
292
293/*
294 * Convert block (dablk) to byte offset in space
295 */
296static inline xfs_dir2_off_t
297xfs_dir2_da_to_byte(struct xfs_da_geometry *geo, xfs_dablk_t da)
298{
299 return xfs_dir2_db_off_to_byte(geo, xfs_dir2_da_to_db(geo, da), 0);
300}
301
302/*
303 * Directory tail pointer accessor functions. Based on block geometry.
304 */
305static inline struct xfs_dir2_block_tail *
306xfs_dir2_block_tail_p(struct xfs_da_geometry *geo, struct xfs_dir2_data_hdr *hdr)
307{
308 return ((struct xfs_dir2_block_tail *)
309 ((char *)hdr + geo->blksize)) - 1;
310}
311
312static inline struct xfs_dir2_leaf_tail *
313xfs_dir2_leaf_tail_p(struct xfs_da_geometry *geo, struct xfs_dir2_leaf *lp)
314{
315 return (struct xfs_dir2_leaf_tail *)
316 ((char *)lp + geo->blksize -
317 sizeof(struct xfs_dir2_leaf_tail));
318}
319
320#endif /* __XFS_DIR2_H__ */
1/* SPDX-License-Identifier: GPL-2.0 */
2/*
3 * Copyright (c) 2000-2001,2005 Silicon Graphics, Inc.
4 * All Rights Reserved.
5 */
6#ifndef __XFS_DIR2_H__
7#define __XFS_DIR2_H__
8
9#include "xfs_da_format.h"
10#include "xfs_da_btree.h"
11
12struct xfs_da_args;
13struct xfs_inode;
14struct xfs_mount;
15struct xfs_trans;
16struct xfs_dir2_sf_hdr;
17struct xfs_dir2_sf_entry;
18struct xfs_dir2_data_hdr;
19struct xfs_dir2_data_entry;
20struct xfs_dir2_data_unused;
21struct xfs_dir3_icfree_hdr;
22struct xfs_dir3_icleaf_hdr;
23
24extern const struct xfs_name xfs_name_dotdot;
25
26/*
27 * Convert inode mode to directory entry filetype
28 */
29extern unsigned char xfs_mode_to_ftype(int mode);
30
31/*
32 * Generic directory interface routines
33 */
34extern void xfs_dir_startup(void);
35extern int xfs_da_mount(struct xfs_mount *mp);
36extern void xfs_da_unmount(struct xfs_mount *mp);
37
38extern int xfs_dir_isempty(struct xfs_inode *dp);
39extern int xfs_dir_init(struct xfs_trans *tp, struct xfs_inode *dp,
40 struct xfs_inode *pdp);
41extern int xfs_dir_createname(struct xfs_trans *tp, struct xfs_inode *dp,
42 const struct xfs_name *name, xfs_ino_t inum,
43 xfs_extlen_t tot);
44extern int xfs_dir_lookup(struct xfs_trans *tp, struct xfs_inode *dp,
45 const struct xfs_name *name, xfs_ino_t *inum,
46 struct xfs_name *ci_name);
47extern int xfs_dir_removename(struct xfs_trans *tp, struct xfs_inode *dp,
48 struct xfs_name *name, xfs_ino_t ino,
49 xfs_extlen_t tot);
50extern int xfs_dir_replace(struct xfs_trans *tp, struct xfs_inode *dp,
51 const struct xfs_name *name, xfs_ino_t inum,
52 xfs_extlen_t tot);
53extern int xfs_dir_canenter(struct xfs_trans *tp, struct xfs_inode *dp,
54 struct xfs_name *name);
55
56/*
57 * Direct call from the bmap code, bypassing the generic directory layer.
58 */
59extern int xfs_dir2_sf_to_block(struct xfs_da_args *args);
60
61/*
62 * Interface routines used by userspace utilities
63 */
64extern int xfs_dir2_isblock(struct xfs_da_args *args, bool *isblock);
65extern int xfs_dir2_isleaf(struct xfs_da_args *args, bool *isleaf);
66extern int xfs_dir2_shrink_inode(struct xfs_da_args *args, xfs_dir2_db_t db,
67 struct xfs_buf *bp);
68
69extern void xfs_dir2_data_freescan(struct xfs_mount *mp,
70 struct xfs_dir2_data_hdr *hdr, int *loghead);
71extern void xfs_dir2_data_log_entry(struct xfs_da_args *args,
72 struct xfs_buf *bp, struct xfs_dir2_data_entry *dep);
73extern void xfs_dir2_data_log_header(struct xfs_da_args *args,
74 struct xfs_buf *bp);
75extern void xfs_dir2_data_log_unused(struct xfs_da_args *args,
76 struct xfs_buf *bp, struct xfs_dir2_data_unused *dup);
77extern void xfs_dir2_data_make_free(struct xfs_da_args *args,
78 struct xfs_buf *bp, xfs_dir2_data_aoff_t offset,
79 xfs_dir2_data_aoff_t len, int *needlogp, int *needscanp);
80extern int xfs_dir2_data_use_free(struct xfs_da_args *args,
81 struct xfs_buf *bp, struct xfs_dir2_data_unused *dup,
82 xfs_dir2_data_aoff_t offset, xfs_dir2_data_aoff_t len,
83 int *needlogp, int *needscanp);
84
85extern struct xfs_dir2_data_free *xfs_dir2_data_freefind(
86 struct xfs_dir2_data_hdr *hdr, struct xfs_dir2_data_free *bf,
87 struct xfs_dir2_data_unused *dup);
88
89extern int xfs_dir_ino_validate(struct xfs_mount *mp, xfs_ino_t ino);
90
91extern const struct xfs_buf_ops xfs_dir3_block_buf_ops;
92extern const struct xfs_buf_ops xfs_dir3_leafn_buf_ops;
93extern const struct xfs_buf_ops xfs_dir3_leaf1_buf_ops;
94extern const struct xfs_buf_ops xfs_dir3_free_buf_ops;
95extern const struct xfs_buf_ops xfs_dir3_data_buf_ops;
96
97/*
98 * Directory offset/block conversion functions.
99 *
100 * DB blocks here are logical directory block numbers, not filesystem blocks.
101 */
102
103/*
104 * Convert dataptr to byte in file space
105 */
106static inline xfs_dir2_off_t
107xfs_dir2_dataptr_to_byte(xfs_dir2_dataptr_t dp)
108{
109 return (xfs_dir2_off_t)dp << XFS_DIR2_DATA_ALIGN_LOG;
110}
111
112/*
113 * Convert byte in file space to dataptr. It had better be aligned.
114 */
115static inline xfs_dir2_dataptr_t
116xfs_dir2_byte_to_dataptr(xfs_dir2_off_t by)
117{
118 return (xfs_dir2_dataptr_t)(by >> XFS_DIR2_DATA_ALIGN_LOG);
119}
120
121/*
122 * Convert byte in space to (DB) block
123 */
124static inline xfs_dir2_db_t
125xfs_dir2_byte_to_db(struct xfs_da_geometry *geo, xfs_dir2_off_t by)
126{
127 return (xfs_dir2_db_t)(by >> geo->blklog);
128}
129
130/*
131 * Convert dataptr to a block number
132 */
133static inline xfs_dir2_db_t
134xfs_dir2_dataptr_to_db(struct xfs_da_geometry *geo, xfs_dir2_dataptr_t dp)
135{
136 return xfs_dir2_byte_to_db(geo, xfs_dir2_dataptr_to_byte(dp));
137}
138
139/*
140 * Convert byte in space to offset in a block
141 */
142static inline xfs_dir2_data_aoff_t
143xfs_dir2_byte_to_off(struct xfs_da_geometry *geo, xfs_dir2_off_t by)
144{
145 return (xfs_dir2_data_aoff_t)(by & (geo->blksize - 1));
146}
147
148/*
149 * Convert dataptr to a byte offset in a block
150 */
151static inline xfs_dir2_data_aoff_t
152xfs_dir2_dataptr_to_off(struct xfs_da_geometry *geo, xfs_dir2_dataptr_t dp)
153{
154 return xfs_dir2_byte_to_off(geo, xfs_dir2_dataptr_to_byte(dp));
155}
156
157/*
158 * Convert block and offset to byte in space
159 */
160static inline xfs_dir2_off_t
161xfs_dir2_db_off_to_byte(struct xfs_da_geometry *geo, xfs_dir2_db_t db,
162 xfs_dir2_data_aoff_t o)
163{
164 return ((xfs_dir2_off_t)db << geo->blklog) + o;
165}
166
167/*
168 * Convert block (DB) to block (dablk)
169 */
170static inline xfs_dablk_t
171xfs_dir2_db_to_da(struct xfs_da_geometry *geo, xfs_dir2_db_t db)
172{
173 return (xfs_dablk_t)(db << (geo->blklog - geo->fsblog));
174}
175
176/*
177 * Convert byte in space to (DA) block
178 */
179static inline xfs_dablk_t
180xfs_dir2_byte_to_da(struct xfs_da_geometry *geo, xfs_dir2_off_t by)
181{
182 return xfs_dir2_db_to_da(geo, xfs_dir2_byte_to_db(geo, by));
183}
184
185/*
186 * Convert block and offset to dataptr
187 */
188static inline xfs_dir2_dataptr_t
189xfs_dir2_db_off_to_dataptr(struct xfs_da_geometry *geo, xfs_dir2_db_t db,
190 xfs_dir2_data_aoff_t o)
191{
192 return xfs_dir2_byte_to_dataptr(xfs_dir2_db_off_to_byte(geo, db, o));
193}
194
195/*
196 * Convert block (dablk) to block (DB)
197 */
198static inline xfs_dir2_db_t
199xfs_dir2_da_to_db(struct xfs_da_geometry *geo, xfs_dablk_t da)
200{
201 return (xfs_dir2_db_t)(da >> (geo->blklog - geo->fsblog));
202}
203
204/*
205 * Convert block (dablk) to byte offset in space
206 */
207static inline xfs_dir2_off_t
208xfs_dir2_da_to_byte(struct xfs_da_geometry *geo, xfs_dablk_t da)
209{
210 return xfs_dir2_db_off_to_byte(geo, xfs_dir2_da_to_db(geo, da), 0);
211}
212
213/*
214 * Directory tail pointer accessor functions. Based on block geometry.
215 */
216static inline struct xfs_dir2_block_tail *
217xfs_dir2_block_tail_p(struct xfs_da_geometry *geo, struct xfs_dir2_data_hdr *hdr)
218{
219 return ((struct xfs_dir2_block_tail *)
220 ((char *)hdr + geo->blksize)) - 1;
221}
222
223static inline struct xfs_dir2_leaf_tail *
224xfs_dir2_leaf_tail_p(struct xfs_da_geometry *geo, struct xfs_dir2_leaf *lp)
225{
226 return (struct xfs_dir2_leaf_tail *)
227 ((char *)lp + geo->blksize -
228 sizeof(struct xfs_dir2_leaf_tail));
229}
230
231/*
232 * The Linux API doesn't pass down the total size of the buffer
233 * we read into down to the filesystem. With the filldir concept
234 * it's not needed for correct information, but the XFS dir2 leaf
235 * code wants an estimate of the buffer size to calculate it's
236 * readahead window and size the buffers used for mapping to
237 * physical blocks.
238 *
239 * Try to give it an estimate that's good enough, maybe at some
240 * point we can change the ->readdir prototype to include the
241 * buffer size. For now we use the current glibc buffer size.
242 * musl libc hardcodes 2k and dietlibc uses PAGE_SIZE.
243 */
244#define XFS_READDIR_BUFSIZE (32768)
245
246unsigned char xfs_dir3_get_dtype(struct xfs_mount *mp, uint8_t filetype);
247unsigned int xfs_dir3_data_end_offset(struct xfs_da_geometry *geo,
248 struct xfs_dir2_data_hdr *hdr);
249bool xfs_dir2_namecheck(const void *name, size_t length);
250
251/*
252 * The "ascii-ci" feature was created to speed up case-insensitive lookups for
253 * a Samba product. Because of the inherent problems with CI and UTF-8
254 * encoding, etc, it was decided that Samba would be configured to export
255 * latin1/iso 8859-1 encodings as that covered >90% of the target markets for
256 * the product. Hence the "ascii-ci" casefolding code could be encoded into
257 * the XFS directory operations and remove all the overhead of casefolding from
258 * Samba.
259 *
260 * To provide consistent hashing behavior between the userspace and kernel,
261 * these functions prepare names for hashing by transforming specific bytes
262 * to other bytes. Robustness with other encodings is not guaranteed.
263 */
264static inline bool xfs_ascii_ci_need_xfrm(unsigned char c)
265{
266 if (c >= 0x41 && c <= 0x5a) /* A-Z */
267 return true;
268 if (c >= 0xc0 && c <= 0xd6) /* latin A-O with accents */
269 return true;
270 if (c >= 0xd8 && c <= 0xde) /* latin O-Y with accents */
271 return true;
272 return false;
273}
274
275static inline unsigned char xfs_ascii_ci_xfrm(unsigned char c)
276{
277 if (xfs_ascii_ci_need_xfrm(c))
278 c -= 'A' - 'a';
279 return c;
280}
281
282#endif /* __XFS_DIR2_H__ */