Commit | Line | Data |
---|---|---|
1da177e4 LT |
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 | */ | |
1da177e4 LT |
12 | #include "adfs.h" |
13 | ||
14 | /* | |
15 | * For future. This should probably be per-directory. | |
16 | */ | |
17 | static DEFINE_RWLOCK(adfs_dir_lock); | |
18 | ||
19 | static int | |
2638ffba | 20 | adfs_readdir(struct file *file, struct dir_context *ctx) |
1da177e4 | 21 | { |
2638ffba | 22 | struct inode *inode = file_inode(file); |
1da177e4 | 23 | struct super_block *sb = inode->i_sb; |
0125f504 | 24 | const struct adfs_dir_ops *ops = ADFS_SB(sb)->s_dir; |
1da177e4 LT |
25 | struct object_info obj; |
26 | struct adfs_dir dir; | |
27 | int ret = 0; | |
28 | ||
2638ffba AV |
29 | if (ctx->pos >> 32) |
30 | return 0; | |
1da177e4 LT |
31 | |
32 | ret = ops->read(sb, inode->i_ino, inode->i_size, &dir); | |
33 | if (ret) | |
2638ffba | 34 | return ret; |
1da177e4 | 35 | |
2638ffba AV |
36 | if (ctx->pos == 0) { |
37 | if (!dir_emit_dot(file, ctx)) | |
1da177e4 | 38 | goto free_out; |
2638ffba AV |
39 | ctx->pos = 1; |
40 | } | |
41 | if (ctx->pos == 1) { | |
42 | if (!dir_emit(ctx, "..", 2, dir.parent_id, DT_DIR)) | |
1da177e4 | 43 | goto free_out; |
2638ffba | 44 | ctx->pos = 2; |
1da177e4 LT |
45 | } |
46 | ||
47 | read_lock(&adfs_dir_lock); | |
48 | ||
2638ffba | 49 | ret = ops->setpos(&dir, ctx->pos - 2); |
1da177e4 LT |
50 | if (ret) |
51 | goto unlock_out; | |
52 | while (ops->getnext(&dir, &obj) == 0) { | |
2638ffba AV |
53 | if (!dir_emit(ctx, obj.name, obj.name_len, |
54 | obj.file_id, DT_UNKNOWN)) | |
55 | break; | |
56 | ctx->pos++; | |
1da177e4 LT |
57 | } |
58 | ||
59 | unlock_out: | |
60 | read_unlock(&adfs_dir_lock); | |
61 | ||
62 | free_out: | |
63 | ops->free(&dir); | |
1da177e4 LT |
64 | return ret; |
65 | } | |
66 | ||
67 | int | |
ffdc9064 | 68 | adfs_dir_update(struct super_block *sb, struct object_info *obj, int wait) |
1da177e4 LT |
69 | { |
70 | int ret = -EINVAL; | |
71 | #ifdef CONFIG_ADFS_FS_RW | |
0125f504 | 72 | const struct adfs_dir_ops *ops = ADFS_SB(sb)->s_dir; |
1da177e4 LT |
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 | ||
ffdc9064 AV |
91 | if (wait) { |
92 | int err = ops->sync(&dir); | |
93 | if (!ret) | |
94 | ret = err; | |
95 | } | |
96 | ||
1da177e4 LT |
97 | ops->free(&dir); |
98 | out: | |
99 | #endif | |
100 | return ret; | |
101 | } | |
102 | ||
103 | static int | |
19a6d89d | 104 | adfs_match(const struct qstr *name, struct object_info *obj) |
1da177e4 LT |
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 | ||
128 | static int | |
19a6d89d | 129 | adfs_dir_lookup_byname(struct inode *inode, const struct qstr *name, struct object_info *obj) |
1da177e4 LT |
130 | { |
131 | struct super_block *sb = inode->i_sb; | |
0125f504 | 132 | const struct adfs_dir_ops *ops = ADFS_SB(sb)->s_dir; |
1da177e4 LT |
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) { | |
19bdd41a | 141 | adfs_error(sb, "parent directory changed under me! (%lx but got %x)\n", |
1da177e4 LT |
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 | ||
1da177e4 LT |
149 | read_lock(&adfs_dir_lock); |
150 | ||
151 | ret = ops->setpos(&dir, 0); | |
152 | if (ret) | |
153 | goto unlock_out; | |
154 | ||
155 | ret = -ENOENT; | |
156 | while (ops->getnext(&dir, obj) == 0) { | |
157 | if (adfs_match(name, obj)) { | |
158 | ret = 0; | |
159 | break; | |
160 | } | |
161 | } | |
162 | ||
163 | unlock_out: | |
164 | read_unlock(&adfs_dir_lock); | |
165 | ||
166 | free_out: | |
167 | ops->free(&dir); | |
168 | out: | |
169 | return ret; | |
170 | } | |
171 | ||
4b6f5d20 | 172 | const struct file_operations adfs_dir_operations = { |
1da177e4 | 173 | .read = generic_read_dir, |
59af1584 | 174 | .llseek = generic_file_llseek, |
2638ffba | 175 | .iterate = adfs_readdir, |
1b061d92 | 176 | .fsync = generic_file_fsync, |
1da177e4 LT |
177 | }; |
178 | ||
179 | static int | |
da53be12 | 180 | adfs_hash(const struct dentry *parent, struct qstr *qstr) |
1da177e4 LT |
181 | { |
182 | const unsigned int name_len = ADFS_SB(parent->d_sb)->s_namelen; | |
183 | const unsigned char *name; | |
184 | unsigned long hash; | |
185 | int i; | |
186 | ||
187 | if (qstr->len < name_len) | |
188 | return 0; | |
189 | ||
190 | /* | |
191 | * Truncate the name in place, avoids | |
192 | * having to define a compare function. | |
193 | */ | |
194 | qstr->len = i = name_len; | |
195 | name = qstr->name; | |
8387ff25 | 196 | hash = init_name_hash(parent); |
1da177e4 LT |
197 | while (i--) { |
198 | char c; | |
199 | ||
200 | c = *name++; | |
201 | if (c >= 'A' && c <= 'Z') | |
202 | c += 'a' - 'A'; | |
203 | ||
204 | hash = partial_name_hash(c, hash); | |
205 | } | |
206 | qstr->hash = end_name_hash(hash); | |
207 | ||
208 | return 0; | |
209 | } | |
210 | ||
211 | /* | |
212 | * Compare two names, taking note of the name length | |
213 | * requirements of the underlying filesystem. | |
214 | */ | |
215 | static int | |
6fa67e70 | 216 | adfs_compare(const struct dentry *dentry, |
621e155a | 217 | unsigned int len, const char *str, const struct qstr *name) |
1da177e4 LT |
218 | { |
219 | int i; | |
220 | ||
621e155a | 221 | if (len != name->len) |
1da177e4 LT |
222 | return 1; |
223 | ||
224 | for (i = 0; i < name->len; i++) { | |
225 | char a, b; | |
226 | ||
621e155a | 227 | a = str[i]; |
1da177e4 LT |
228 | b = name->name[i]; |
229 | ||
230 | if (a >= 'A' && a <= 'Z') | |
231 | a += 'a' - 'A'; | |
232 | if (b >= 'A' && b <= 'Z') | |
233 | b += 'a' - 'A'; | |
234 | ||
235 | if (a != b) | |
236 | return 1; | |
237 | } | |
238 | return 0; | |
239 | } | |
240 | ||
e16404ed | 241 | const struct dentry_operations adfs_dentry_operations = { |
1da177e4 LT |
242 | .d_hash = adfs_hash, |
243 | .d_compare = adfs_compare, | |
244 | }; | |
245 | ||
246 | static struct dentry * | |
00cd8dd3 | 247 | adfs_lookup(struct inode *dir, struct dentry *dentry, unsigned int flags) |
1da177e4 LT |
248 | { |
249 | struct inode *inode = NULL; | |
250 | struct object_info obj; | |
251 | int error; | |
252 | ||
1da177e4 LT |
253 | error = adfs_dir_lookup_byname(dir, &dentry->d_name, &obj); |
254 | if (error == 0) { | |
1da177e4 LT |
255 | /* |
256 | * This only returns NULL if get_empty_inode | |
257 | * fails. | |
258 | */ | |
259 | inode = adfs_iget(dir->i_sb, &obj); | |
9a7dddca AV |
260 | if (!inode) |
261 | inode = ERR_PTR(-EACCES); | |
262 | } else if (error != -ENOENT) { | |
263 | inode = ERR_PTR(error); | |
1da177e4 | 264 | } |
9a7dddca | 265 | return d_splice_alias(inode, dentry); |
1da177e4 LT |
266 | } |
267 | ||
268 | /* | |
269 | * directories can handle most operations... | |
270 | */ | |
754661f1 | 271 | const struct inode_operations adfs_dir_inode_operations = { |
1da177e4 LT |
272 | .lookup = adfs_lookup, |
273 | .setattr = adfs_notify_change, | |
274 | }; |