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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#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;
21
22extern struct xfs_name xfs_name_dotdot;
23
24/*
25 * Convert inode mode to directory entry filetype
26 */
27extern unsigned char xfs_mode_to_ftype(int mode);
28
29/*
30 * directory operations vector for encode/decode routines
31 */
32struct xfs_dir_ops {
33 int (*sf_entsize)(struct xfs_dir2_sf_hdr *hdr, int len);
34 struct xfs_dir2_sf_entry *
35 (*sf_nextentry)(struct xfs_dir2_sf_hdr *hdr,
36 struct xfs_dir2_sf_entry *sfep);
37 uint8_t (*sf_get_ftype)(struct xfs_dir2_sf_entry *sfep);
38 void (*sf_put_ftype)(struct xfs_dir2_sf_entry *sfep,
39 uint8_t ftype);
40 xfs_ino_t (*sf_get_ino)(struct xfs_dir2_sf_hdr *hdr,
41 struct xfs_dir2_sf_entry *sfep);
42 void (*sf_put_ino)(struct xfs_dir2_sf_hdr *hdr,
43 struct xfs_dir2_sf_entry *sfep,
44 xfs_ino_t ino);
45 xfs_ino_t (*sf_get_parent_ino)(struct xfs_dir2_sf_hdr *hdr);
46 void (*sf_put_parent_ino)(struct xfs_dir2_sf_hdr *hdr,
47 xfs_ino_t ino);
48
49 int (*data_entsize)(int len);
50 uint8_t (*data_get_ftype)(struct xfs_dir2_data_entry *dep);
51 void (*data_put_ftype)(struct xfs_dir2_data_entry *dep,
52 uint8_t ftype);
53 __be16 * (*data_entry_tag_p)(struct xfs_dir2_data_entry *dep);
54 struct xfs_dir2_data_free *
55 (*data_bestfree_p)(struct xfs_dir2_data_hdr *hdr);
56
57 xfs_dir2_data_aoff_t data_dot_offset;
58 xfs_dir2_data_aoff_t data_dotdot_offset;
59 xfs_dir2_data_aoff_t data_first_offset;
60 size_t data_entry_offset;
61
62 struct xfs_dir2_data_entry *
63 (*data_dot_entry_p)(struct xfs_dir2_data_hdr *hdr);
64 struct xfs_dir2_data_entry *
65 (*data_dotdot_entry_p)(struct xfs_dir2_data_hdr *hdr);
66 struct xfs_dir2_data_entry *
67 (*data_first_entry_p)(struct xfs_dir2_data_hdr *hdr);
68 struct xfs_dir2_data_entry *
69 (*data_entry_p)(struct xfs_dir2_data_hdr *hdr);
70 struct xfs_dir2_data_unused *
71 (*data_unused_p)(struct xfs_dir2_data_hdr *hdr);
72
73 int leaf_hdr_size;
74 void (*leaf_hdr_to_disk)(struct xfs_dir2_leaf *to,
75 struct xfs_dir3_icleaf_hdr *from);
76 void (*leaf_hdr_from_disk)(struct xfs_dir3_icleaf_hdr *to,
77 struct xfs_dir2_leaf *from);
78 int (*leaf_max_ents)(struct xfs_da_geometry *geo);
79 struct xfs_dir2_leaf_entry *
80 (*leaf_ents_p)(struct xfs_dir2_leaf *lp);
81
82 int node_hdr_size;
83 void (*node_hdr_to_disk)(struct xfs_da_intnode *to,
84 struct xfs_da3_icnode_hdr *from);
85 void (*node_hdr_from_disk)(struct xfs_da3_icnode_hdr *to,
86 struct xfs_da_intnode *from);
87 struct xfs_da_node_entry *
88 (*node_tree_p)(struct xfs_da_intnode *dap);
89
90 int free_hdr_size;
91 void (*free_hdr_to_disk)(struct xfs_dir2_free *to,
92 struct xfs_dir3_icfree_hdr *from);
93 void (*free_hdr_from_disk)(struct xfs_dir3_icfree_hdr *to,
94 struct xfs_dir2_free *from);
95 int (*free_max_bests)(struct xfs_da_geometry *geo);
96 __be16 * (*free_bests_p)(struct xfs_dir2_free *free);
97 xfs_dir2_db_t (*db_to_fdb)(struct xfs_da_geometry *geo,
98 xfs_dir2_db_t db);
99 int (*db_to_fdindex)(struct xfs_da_geometry *geo,
100 xfs_dir2_db_t db);
101};
102
103extern const struct xfs_dir_ops *
104 xfs_dir_get_ops(struct xfs_mount *mp, struct xfs_inode *dp);
105extern const struct xfs_dir_ops *
106 xfs_nondir_get_ops(struct xfs_mount *mp, struct xfs_inode *dp);
107
108/*
109 * Generic directory interface routines
110 */
111extern void xfs_dir_startup(void);
112extern int xfs_da_mount(struct xfs_mount *mp);
113extern void xfs_da_unmount(struct xfs_mount *mp);
114
115extern int xfs_dir_isempty(struct xfs_inode *dp);
116extern int xfs_dir_init(struct xfs_trans *tp, struct xfs_inode *dp,
117 struct xfs_inode *pdp);
118extern int xfs_dir_createname(struct xfs_trans *tp, struct xfs_inode *dp,
119 struct xfs_name *name, xfs_ino_t inum,
120 xfs_extlen_t tot);
121extern int xfs_dir_lookup(struct xfs_trans *tp, struct xfs_inode *dp,
122 struct xfs_name *name, xfs_ino_t *inum,
123 struct xfs_name *ci_name);
124extern int xfs_dir_removename(struct xfs_trans *tp, struct xfs_inode *dp,
125 struct xfs_name *name, xfs_ino_t ino,
126 xfs_extlen_t tot);
127extern int xfs_dir_replace(struct xfs_trans *tp, struct xfs_inode *dp,
128 struct xfs_name *name, xfs_ino_t inum,
129 xfs_extlen_t tot);
130extern int xfs_dir_canenter(struct xfs_trans *tp, struct xfs_inode *dp,
131 struct xfs_name *name);
132
133/*
134 * Direct call from the bmap code, bypassing the generic directory layer.
135 */
136extern int xfs_dir2_sf_to_block(struct xfs_da_args *args);
137
138/*
139 * Interface routines used by userspace utilities
140 */
141extern int xfs_dir2_isblock(struct xfs_da_args *args, int *r);
142extern int xfs_dir2_isleaf(struct xfs_da_args *args, int *r);
143extern int xfs_dir2_shrink_inode(struct xfs_da_args *args, xfs_dir2_db_t db,
144 struct xfs_buf *bp);
145
146extern void xfs_dir2_data_freescan_int(struct xfs_da_geometry *geo,
147 const struct xfs_dir_ops *ops,
148 struct xfs_dir2_data_hdr *hdr, int *loghead);
149extern void xfs_dir2_data_freescan(struct xfs_inode *dp,
150 struct xfs_dir2_data_hdr *hdr, int *loghead);
151extern void xfs_dir2_data_log_entry(struct xfs_da_args *args,
152 struct xfs_buf *bp, struct xfs_dir2_data_entry *dep);
153extern void xfs_dir2_data_log_header(struct xfs_da_args *args,
154 struct xfs_buf *bp);
155extern void xfs_dir2_data_log_unused(struct xfs_da_args *args,
156 struct xfs_buf *bp, struct xfs_dir2_data_unused *dup);
157extern void xfs_dir2_data_make_free(struct xfs_da_args *args,
158 struct xfs_buf *bp, xfs_dir2_data_aoff_t offset,
159 xfs_dir2_data_aoff_t len, int *needlogp, int *needscanp);
160extern int xfs_dir2_data_use_free(struct xfs_da_args *args,
161 struct xfs_buf *bp, struct xfs_dir2_data_unused *dup,
162 xfs_dir2_data_aoff_t offset, xfs_dir2_data_aoff_t len,
163 int *needlogp, int *needscanp);
164
165extern struct xfs_dir2_data_free *xfs_dir2_data_freefind(
166 struct xfs_dir2_data_hdr *hdr, struct xfs_dir2_data_free *bf,
167 struct xfs_dir2_data_unused *dup);
168
169extern int xfs_dir_ino_validate(struct xfs_mount *mp, xfs_ino_t ino);
170
171extern const struct xfs_buf_ops xfs_dir3_block_buf_ops;
172extern const struct xfs_buf_ops xfs_dir3_leafn_buf_ops;
173extern const struct xfs_buf_ops xfs_dir3_leaf1_buf_ops;
174extern const struct xfs_buf_ops xfs_dir3_free_buf_ops;
175extern const struct xfs_buf_ops xfs_dir3_data_buf_ops;
176
177/*
178 * Directory offset/block conversion functions.
179 *
180 * DB blocks here are logical directory block numbers, not filesystem blocks.
181 */
182
183/*
184 * Convert dataptr to byte in file space
185 */
186static inline xfs_dir2_off_t
187xfs_dir2_dataptr_to_byte(xfs_dir2_dataptr_t dp)
188{
189 return (xfs_dir2_off_t)dp << XFS_DIR2_DATA_ALIGN_LOG;
190}
191
192/*
193 * Convert byte in file space to dataptr. It had better be aligned.
194 */
195static inline xfs_dir2_dataptr_t
196xfs_dir2_byte_to_dataptr(xfs_dir2_off_t by)
197{
198 return (xfs_dir2_dataptr_t)(by >> XFS_DIR2_DATA_ALIGN_LOG);
199}
200
201/*
202 * Convert byte in space to (DB) block
203 */
204static inline xfs_dir2_db_t
205xfs_dir2_byte_to_db(struct xfs_da_geometry *geo, xfs_dir2_off_t by)
206{
207 return (xfs_dir2_db_t)(by >> geo->blklog);
208}
209
210/*
211 * Convert dataptr to a block number
212 */
213static inline xfs_dir2_db_t
214xfs_dir2_dataptr_to_db(struct xfs_da_geometry *geo, xfs_dir2_dataptr_t dp)
215{
216 return xfs_dir2_byte_to_db(geo, xfs_dir2_dataptr_to_byte(dp));
217}
218
219/*
220 * Convert byte in space to offset in a block
221 */
222static inline xfs_dir2_data_aoff_t
223xfs_dir2_byte_to_off(struct xfs_da_geometry *geo, xfs_dir2_off_t by)
224{
225 return (xfs_dir2_data_aoff_t)(by & (geo->blksize - 1));
226}
227
228/*
229 * Convert dataptr to a byte offset in a block
230 */
231static inline xfs_dir2_data_aoff_t
232xfs_dir2_dataptr_to_off(struct xfs_da_geometry *geo, xfs_dir2_dataptr_t dp)
233{
234 return xfs_dir2_byte_to_off(geo, xfs_dir2_dataptr_to_byte(dp));
235}
236
237/*
238 * Convert block and offset to byte in space
239 */
240static inline xfs_dir2_off_t
241xfs_dir2_db_off_to_byte(struct xfs_da_geometry *geo, xfs_dir2_db_t db,
242 xfs_dir2_data_aoff_t o)
243{
244 return ((xfs_dir2_off_t)db << geo->blklog) + o;
245}
246
247/*
248 * Convert block (DB) to block (dablk)
249 */
250static inline xfs_dablk_t
251xfs_dir2_db_to_da(struct xfs_da_geometry *geo, xfs_dir2_db_t db)
252{
253 return (xfs_dablk_t)(db << (geo->blklog - geo->fsblog));
254}
255
256/*
257 * Convert byte in space to (DA) block
258 */
259static inline xfs_dablk_t
260xfs_dir2_byte_to_da(struct xfs_da_geometry *geo, xfs_dir2_off_t by)
261{
262 return xfs_dir2_db_to_da(geo, xfs_dir2_byte_to_db(geo, by));
263}
264
265/*
266 * Convert block and offset to dataptr
267 */
268static inline xfs_dir2_dataptr_t
269xfs_dir2_db_off_to_dataptr(struct xfs_da_geometry *geo, xfs_dir2_db_t db,
270 xfs_dir2_data_aoff_t o)
271{
272 return xfs_dir2_byte_to_dataptr(xfs_dir2_db_off_to_byte(geo, db, o));
273}
274
275/*
276 * Convert block (dablk) to block (DB)
277 */
278static inline xfs_dir2_db_t
279xfs_dir2_da_to_db(struct xfs_da_geometry *geo, xfs_dablk_t da)
280{
281 return (xfs_dir2_db_t)(da >> (geo->blklog - geo->fsblog));
282}
283
284/*
285 * Convert block (dablk) to byte offset in space
286 */
287static inline xfs_dir2_off_t
288xfs_dir2_da_to_byte(struct xfs_da_geometry *geo, xfs_dablk_t da)
289{
290 return xfs_dir2_db_off_to_byte(geo, xfs_dir2_da_to_db(geo, da), 0);
291}
292
293/*
294 * Directory tail pointer accessor functions. Based on block geometry.
295 */
296static inline struct xfs_dir2_block_tail *
297xfs_dir2_block_tail_p(struct xfs_da_geometry *geo, struct xfs_dir2_data_hdr *hdr)
298{
299 return ((struct xfs_dir2_block_tail *)
300 ((char *)hdr + geo->blksize)) - 1;
301}
302
303static inline struct xfs_dir2_leaf_tail *
304xfs_dir2_leaf_tail_p(struct xfs_da_geometry *geo, struct xfs_dir2_leaf *lp)
305{
306 return (struct xfs_dir2_leaf_tail *)
307 ((char *)lp + geo->blksize -
308 sizeof(struct xfs_dir2_leaf_tail));
309}
310
311/*
312 * The Linux API doesn't pass down the total size of the buffer
313 * we read into down to the filesystem. With the filldir concept
314 * it's not needed for correct information, but the XFS dir2 leaf
315 * code wants an estimate of the buffer size to calculate it's
316 * readahead window and size the buffers used for mapping to
317 * physical blocks.
318 *
319 * Try to give it an estimate that's good enough, maybe at some
320 * point we can change the ->readdir prototype to include the
321 * buffer size. For now we use the current glibc buffer size.
322 * musl libc hardcodes 2k and dietlibc uses PAGE_SIZE.
323 */
324#define XFS_READDIR_BUFSIZE (32768)
325
326unsigned char xfs_dir3_get_dtype(struct xfs_mount *mp, uint8_t filetype);
327void *xfs_dir3_data_endp(struct xfs_da_geometry *geo,
328 struct xfs_dir2_data_hdr *hdr);
329bool xfs_dir2_namecheck(const void *name, size_t length);
330
331#endif /* __XFS_DIR2_H__ */