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1/*
2 * linux/fs/adfs/dir.c
3 *
4 * Copyright (C) 1999-2000 Russell King
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License version 2 as
8 * published by the Free Software Foundation.
9 *
10 * Common directory handling for ADFS
11 */
12#include "adfs.h"
13
14/*
15 * For future. This should probably be per-directory.
16 */
17static DEFINE_RWLOCK(adfs_dir_lock);
18
19static int
20adfs_readdir(struct file *file, struct dir_context *ctx)
21{
22 struct inode *inode = file_inode(file);
23 struct super_block *sb = inode->i_sb;
24 struct adfs_dir_ops *ops = ADFS_SB(sb)->s_dir;
25 struct object_info obj;
26 struct adfs_dir dir;
27 int ret = 0;
28
29 if (ctx->pos >> 32)
30 return 0;
31
32 ret = ops->read(sb, inode->i_ino, inode->i_size, &dir);
33 if (ret)
34 return ret;
35
36 if (ctx->pos == 0) {
37 if (!dir_emit_dot(file, ctx))
38 goto free_out;
39 ctx->pos = 1;
40 }
41 if (ctx->pos == 1) {
42 if (!dir_emit(ctx, "..", 2, dir.parent_id, DT_DIR))
43 goto free_out;
44 ctx->pos = 2;
45 }
46
47 read_lock(&adfs_dir_lock);
48
49 ret = ops->setpos(&dir, ctx->pos - 2);
50 if (ret)
51 goto unlock_out;
52 while (ops->getnext(&dir, &obj) == 0) {
53 if (!dir_emit(ctx, obj.name, obj.name_len,
54 obj.file_id, DT_UNKNOWN))
55 break;
56 ctx->pos++;
57 }
58
59unlock_out:
60 read_unlock(&adfs_dir_lock);
61
62free_out:
63 ops->free(&dir);
64 return ret;
65}
66
67int
68adfs_dir_update(struct super_block *sb, struct object_info *obj, int wait)
69{
70 int ret = -EINVAL;
71#ifdef CONFIG_ADFS_FS_RW
72 struct adfs_dir_ops *ops = ADFS_SB(sb)->s_dir;
73 struct adfs_dir dir;
74
75 printk(KERN_INFO "adfs_dir_update: object %06X in dir %06X\n",
76 obj->file_id, obj->parent_id);
77
78 if (!ops->update) {
79 ret = -EINVAL;
80 goto out;
81 }
82
83 ret = ops->read(sb, obj->parent_id, 0, &dir);
84 if (ret)
85 goto out;
86
87 write_lock(&adfs_dir_lock);
88 ret = ops->update(&dir, obj);
89 write_unlock(&adfs_dir_lock);
90
91 if (wait) {
92 int err = ops->sync(&dir);
93 if (!ret)
94 ret = err;
95 }
96
97 ops->free(&dir);
98out:
99#endif
100 return ret;
101}
102
103static int
104adfs_match(struct qstr *name, struct object_info *obj)
105{
106 int i;
107
108 if (name->len != obj->name_len)
109 return 0;
110
111 for (i = 0; i < name->len; i++) {
112 char c1, c2;
113
114 c1 = name->name[i];
115 c2 = obj->name[i];
116
117 if (c1 >= 'A' && c1 <= 'Z')
118 c1 += 'a' - 'A';
119 if (c2 >= 'A' && c2 <= 'Z')
120 c2 += 'a' - 'A';
121
122 if (c1 != c2)
123 return 0;
124 }
125 return 1;
126}
127
128static int
129adfs_dir_lookup_byname(struct inode *inode, struct qstr *name, struct object_info *obj)
130{
131 struct super_block *sb = inode->i_sb;
132 struct adfs_dir_ops *ops = ADFS_SB(sb)->s_dir;
133 struct adfs_dir dir;
134 int ret;
135
136 ret = ops->read(sb, inode->i_ino, inode->i_size, &dir);
137 if (ret)
138 goto out;
139
140 if (ADFS_I(inode)->parent_id != dir.parent_id) {
141 adfs_error(sb, "parent directory changed under me! (%lx but got %lx)\n",
142 ADFS_I(inode)->parent_id, dir.parent_id);
143 ret = -EIO;
144 goto free_out;
145 }
146
147 obj->parent_id = inode->i_ino;
148
149 /*
150 * '.' is handled by reserved_lookup() in fs/namei.c
151 */
152 if (name->len == 2 && name->name[0] == '.' && name->name[1] == '.') {
153 /*
154 * Currently unable to fill in the rest of 'obj',
155 * but this is better than nothing. We need to
156 * ascend one level to find it's parent.
157 */
158 obj->name_len = 0;
159 obj->file_id = obj->parent_id;
160 goto free_out;
161 }
162
163 read_lock(&adfs_dir_lock);
164
165 ret = ops->setpos(&dir, 0);
166 if (ret)
167 goto unlock_out;
168
169 ret = -ENOENT;
170 while (ops->getnext(&dir, obj) == 0) {
171 if (adfs_match(name, obj)) {
172 ret = 0;
173 break;
174 }
175 }
176
177unlock_out:
178 read_unlock(&adfs_dir_lock);
179
180free_out:
181 ops->free(&dir);
182out:
183 return ret;
184}
185
186const struct file_operations adfs_dir_operations = {
187 .read = generic_read_dir,
188 .llseek = generic_file_llseek,
189 .iterate = adfs_readdir,
190 .fsync = generic_file_fsync,
191};
192
193static int
194adfs_hash(const struct dentry *parent, struct qstr *qstr)
195{
196 const unsigned int name_len = ADFS_SB(parent->d_sb)->s_namelen;
197 const unsigned char *name;
198 unsigned long hash;
199 int i;
200
201 if (qstr->len < name_len)
202 return 0;
203
204 /*
205 * Truncate the name in place, avoids
206 * having to define a compare function.
207 */
208 qstr->len = i = name_len;
209 name = qstr->name;
210 hash = init_name_hash();
211 while (i--) {
212 char c;
213
214 c = *name++;
215 if (c >= 'A' && c <= 'Z')
216 c += 'a' - 'A';
217
218 hash = partial_name_hash(c, hash);
219 }
220 qstr->hash = end_name_hash(hash);
221
222 return 0;
223}
224
225/*
226 * Compare two names, taking note of the name length
227 * requirements of the underlying filesystem.
228 */
229static int
230adfs_compare(const struct dentry *parent, const struct dentry *dentry,
231 unsigned int len, const char *str, const struct qstr *name)
232{
233 int i;
234
235 if (len != name->len)
236 return 1;
237
238 for (i = 0; i < name->len; i++) {
239 char a, b;
240
241 a = str[i];
242 b = name->name[i];
243
244 if (a >= 'A' && a <= 'Z')
245 a += 'a' - 'A';
246 if (b >= 'A' && b <= 'Z')
247 b += 'a' - 'A';
248
249 if (a != b)
250 return 1;
251 }
252 return 0;
253}
254
255const struct dentry_operations adfs_dentry_operations = {
256 .d_hash = adfs_hash,
257 .d_compare = adfs_compare,
258};
259
260static struct dentry *
261adfs_lookup(struct inode *dir, struct dentry *dentry, unsigned int flags)
262{
263 struct inode *inode = NULL;
264 struct object_info obj;
265 int error;
266
267 error = adfs_dir_lookup_byname(dir, &dentry->d_name, &obj);
268 if (error == 0) {
269 error = -EACCES;
270 /*
271 * This only returns NULL if get_empty_inode
272 * fails.
273 */
274 inode = adfs_iget(dir->i_sb, &obj);
275 if (inode)
276 error = 0;
277 }
278 d_add(dentry, inode);
279 return ERR_PTR(error);
280}
281
282/*
283 * directories can handle most operations...
284 */
285const struct inode_operations adfs_dir_inode_operations = {
286 .lookup = adfs_lookup,
287 .setattr = adfs_notify_change,
288};
1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * linux/fs/adfs/dir.c
4 *
5 * Copyright (C) 1999-2000 Russell King
6 *
7 * Common directory handling for ADFS
8 */
9#include "adfs.h"
10
11/*
12 * For future. This should probably be per-directory.
13 */
14static DEFINE_RWLOCK(adfs_dir_lock);
15
16void adfs_object_fixup(struct adfs_dir *dir, struct object_info *obj)
17{
18 unsigned int dots, i;
19
20 /*
21 * RISC OS allows the use of '/' in directory entry names, so we need
22 * to fix these up. '/' is typically used for FAT compatibility to
23 * represent '.', so do the same conversion here. In any case, '.'
24 * will never be in a RISC OS name since it is used as the pathname
25 * separator. Handle the case where we may generate a '.' or '..'
26 * name, replacing the first character with '^' (the RISC OS "parent
27 * directory" character.)
28 */
29 for (i = dots = 0; i < obj->name_len; i++)
30 if (obj->name[i] == '/') {
31 obj->name[i] = '.';
32 dots++;
33 }
34
35 if (obj->name_len <= 2 && dots == obj->name_len)
36 obj->name[0] = '^';
37
38 /*
39 * If the object is a file, and the user requested the ,xyz hex
40 * filetype suffix to the name, check the filetype and append.
41 */
42 if (!(obj->attr & ADFS_NDA_DIRECTORY) && ADFS_SB(dir->sb)->s_ftsuffix) {
43 u16 filetype = adfs_filetype(obj->loadaddr);
44
45 if (filetype != ADFS_FILETYPE_NONE) {
46 obj->name[obj->name_len++] = ',';
47 obj->name[obj->name_len++] = hex_asc_lo(filetype >> 8);
48 obj->name[obj->name_len++] = hex_asc_lo(filetype >> 4);
49 obj->name[obj->name_len++] = hex_asc_lo(filetype >> 0);
50 }
51 }
52}
53
54static int
55adfs_readdir(struct file *file, struct dir_context *ctx)
56{
57 struct inode *inode = file_inode(file);
58 struct super_block *sb = inode->i_sb;
59 const struct adfs_dir_ops *ops = ADFS_SB(sb)->s_dir;
60 struct object_info obj;
61 struct adfs_dir dir;
62 int ret = 0;
63
64 if (ctx->pos >> 32)
65 return 0;
66
67 ret = ops->read(sb, inode->i_ino, inode->i_size, &dir);
68 if (ret)
69 return ret;
70
71 if (ctx->pos == 0) {
72 if (!dir_emit_dot(file, ctx))
73 goto free_out;
74 ctx->pos = 1;
75 }
76 if (ctx->pos == 1) {
77 if (!dir_emit(ctx, "..", 2, dir.parent_id, DT_DIR))
78 goto free_out;
79 ctx->pos = 2;
80 }
81
82 read_lock(&adfs_dir_lock);
83
84 ret = ops->setpos(&dir, ctx->pos - 2);
85 if (ret)
86 goto unlock_out;
87 while (ops->getnext(&dir, &obj) == 0) {
88 if (!dir_emit(ctx, obj.name, obj.name_len,
89 obj.indaddr, DT_UNKNOWN))
90 break;
91 ctx->pos++;
92 }
93
94unlock_out:
95 read_unlock(&adfs_dir_lock);
96
97free_out:
98 ops->free(&dir);
99 return ret;
100}
101
102int
103adfs_dir_update(struct super_block *sb, struct object_info *obj, int wait)
104{
105 int ret = -EINVAL;
106#ifdef CONFIG_ADFS_FS_RW
107 const struct adfs_dir_ops *ops = ADFS_SB(sb)->s_dir;
108 struct adfs_dir dir;
109
110 printk(KERN_INFO "adfs_dir_update: object %06x in dir %06x\n",
111 obj->indaddr, obj->parent_id);
112
113 if (!ops->update) {
114 ret = -EINVAL;
115 goto out;
116 }
117
118 ret = ops->read(sb, obj->parent_id, 0, &dir);
119 if (ret)
120 goto out;
121
122 write_lock(&adfs_dir_lock);
123 ret = ops->update(&dir, obj);
124 write_unlock(&adfs_dir_lock);
125
126 if (wait) {
127 int err = ops->sync(&dir);
128 if (!ret)
129 ret = err;
130 }
131
132 ops->free(&dir);
133out:
134#endif
135 return ret;
136}
137
138static unsigned char adfs_tolower(unsigned char c)
139{
140 if (c >= 'A' && c <= 'Z')
141 c += 'a' - 'A';
142 return c;
143}
144
145static int __adfs_compare(const unsigned char *qstr, u32 qlen,
146 const char *str, u32 len)
147{
148 u32 i;
149
150 if (qlen != len)
151 return 1;
152
153 for (i = 0; i < qlen; i++)
154 if (adfs_tolower(qstr[i]) != adfs_tolower(str[i]))
155 return 1;
156
157 return 0;
158}
159
160static int adfs_dir_lookup_byname(struct inode *inode, const struct qstr *qstr,
161 struct object_info *obj)
162{
163 struct super_block *sb = inode->i_sb;
164 const struct adfs_dir_ops *ops = ADFS_SB(sb)->s_dir;
165 const unsigned char *name;
166 struct adfs_dir dir;
167 u32 name_len;
168 int ret;
169
170 ret = ops->read(sb, inode->i_ino, inode->i_size, &dir);
171 if (ret)
172 goto out;
173
174 if (ADFS_I(inode)->parent_id != dir.parent_id) {
175 adfs_error(sb,
176 "parent directory changed under me! (%06x but got %06x)\n",
177 ADFS_I(inode)->parent_id, dir.parent_id);
178 ret = -EIO;
179 goto free_out;
180 }
181
182 obj->parent_id = inode->i_ino;
183
184 read_lock(&adfs_dir_lock);
185
186 ret = ops->setpos(&dir, 0);
187 if (ret)
188 goto unlock_out;
189
190 ret = -ENOENT;
191 name = qstr->name;
192 name_len = qstr->len;
193 while (ops->getnext(&dir, obj) == 0) {
194 if (!__adfs_compare(name, name_len, obj->name, obj->name_len)) {
195 ret = 0;
196 break;
197 }
198 }
199
200unlock_out:
201 read_unlock(&adfs_dir_lock);
202
203free_out:
204 ops->free(&dir);
205out:
206 return ret;
207}
208
209const struct file_operations adfs_dir_operations = {
210 .read = generic_read_dir,
211 .llseek = generic_file_llseek,
212 .iterate = adfs_readdir,
213 .fsync = generic_file_fsync,
214};
215
216static int
217adfs_hash(const struct dentry *parent, struct qstr *qstr)
218{
219 const unsigned char *name;
220 unsigned long hash;
221 u32 len;
222
223 if (qstr->len > ADFS_SB(parent->d_sb)->s_namelen)
224 return -ENAMETOOLONG;
225
226 len = qstr->len;
227 name = qstr->name;
228 hash = init_name_hash(parent);
229 while (len--)
230 hash = partial_name_hash(adfs_tolower(*name++), hash);
231 qstr->hash = end_name_hash(hash);
232
233 return 0;
234}
235
236/*
237 * Compare two names, taking note of the name length
238 * requirements of the underlying filesystem.
239 */
240static int adfs_compare(const struct dentry *dentry, unsigned int len,
241 const char *str, const struct qstr *qstr)
242{
243 return __adfs_compare(qstr->name, qstr->len, str, len);
244}
245
246const struct dentry_operations adfs_dentry_operations = {
247 .d_hash = adfs_hash,
248 .d_compare = adfs_compare,
249};
250
251static struct dentry *
252adfs_lookup(struct inode *dir, struct dentry *dentry, unsigned int flags)
253{
254 struct inode *inode = NULL;
255 struct object_info obj;
256 int error;
257
258 error = adfs_dir_lookup_byname(dir, &dentry->d_name, &obj);
259 if (error == 0) {
260 /*
261 * This only returns NULL if get_empty_inode
262 * fails.
263 */
264 inode = adfs_iget(dir->i_sb, &obj);
265 if (!inode)
266 inode = ERR_PTR(-EACCES);
267 } else if (error != -ENOENT) {
268 inode = ERR_PTR(error);
269 }
270 return d_splice_alias(inode, dentry);
271}
272
273/*
274 * directories can handle most operations...
275 */
276const struct inode_operations adfs_dir_inode_operations = {
277 .lookup = adfs_lookup,
278 .setattr = adfs_notify_change,
279};