Commit | Line | Data |
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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 | ||
411c49bc RK |
19 | void adfs_object_fixup(struct adfs_dir *dir, struct object_info *obj) |
20 | { | |
adb514a4 RK |
21 | unsigned int i; |
22 | ||
23 | /* | |
24 | * RISC OS allows the use of '/' in directory entry names, so we need | |
25 | * to fix these up. '/' is typically used for FAT compatibility to | |
26 | * represent '.', so do the same conversion here. In any case, '.' | |
27 | * will never be in a RISC OS name since it is used as the pathname | |
28 | * separator. | |
29 | */ | |
30 | for (i = 0; i < obj->name_len; i++) | |
31 | if (obj->name[i] == '/') | |
32 | obj->name[i] = '.'; | |
33 | ||
411c49bc RK |
34 | obj->filetype = -1; |
35 | ||
36 | /* | |
37 | * object is a file and is filetyped and timestamped? | |
38 | * RISC OS 12-bit filetype is stored in load_address[19:8] | |
39 | */ | |
40 | if ((0 == (obj->attr & ADFS_NDA_DIRECTORY)) && | |
41 | (0xfff00000 == (0xfff00000 & obj->loadaddr))) { | |
42 | obj->filetype = (__u16) ((0x000fff00 & obj->loadaddr) >> 8); | |
43 | ||
44 | /* optionally append the ,xyz hex filetype suffix */ | |
45 | if (ADFS_SB(dir->sb)->s_ftsuffix) | |
46 | obj->name_len += | |
47 | append_filetype_suffix( | |
48 | &obj->name[obj->name_len], | |
49 | obj->filetype); | |
50 | } | |
51 | } | |
52 | ||
1da177e4 | 53 | static int |
2638ffba | 54 | adfs_readdir(struct file *file, struct dir_context *ctx) |
1da177e4 | 55 | { |
2638ffba | 56 | struct inode *inode = file_inode(file); |
1da177e4 | 57 | struct super_block *sb = inode->i_sb; |
0125f504 | 58 | const struct adfs_dir_ops *ops = ADFS_SB(sb)->s_dir; |
1da177e4 LT |
59 | struct object_info obj; |
60 | struct adfs_dir dir; | |
61 | int ret = 0; | |
62 | ||
2638ffba AV |
63 | if (ctx->pos >> 32) |
64 | return 0; | |
1da177e4 LT |
65 | |
66 | ret = ops->read(sb, inode->i_ino, inode->i_size, &dir); | |
67 | if (ret) | |
2638ffba | 68 | return ret; |
1da177e4 | 69 | |
2638ffba AV |
70 | if (ctx->pos == 0) { |
71 | if (!dir_emit_dot(file, ctx)) | |
1da177e4 | 72 | goto free_out; |
2638ffba AV |
73 | ctx->pos = 1; |
74 | } | |
75 | if (ctx->pos == 1) { | |
76 | if (!dir_emit(ctx, "..", 2, dir.parent_id, DT_DIR)) | |
1da177e4 | 77 | goto free_out; |
2638ffba | 78 | ctx->pos = 2; |
1da177e4 LT |
79 | } |
80 | ||
81 | read_lock(&adfs_dir_lock); | |
82 | ||
2638ffba | 83 | ret = ops->setpos(&dir, ctx->pos - 2); |
1da177e4 LT |
84 | if (ret) |
85 | goto unlock_out; | |
86 | while (ops->getnext(&dir, &obj) == 0) { | |
2638ffba AV |
87 | if (!dir_emit(ctx, obj.name, obj.name_len, |
88 | obj.file_id, DT_UNKNOWN)) | |
89 | break; | |
90 | ctx->pos++; | |
1da177e4 LT |
91 | } |
92 | ||
93 | unlock_out: | |
94 | read_unlock(&adfs_dir_lock); | |
95 | ||
96 | free_out: | |
97 | ops->free(&dir); | |
1da177e4 LT |
98 | return ret; |
99 | } | |
100 | ||
101 | int | |
ffdc9064 | 102 | adfs_dir_update(struct super_block *sb, struct object_info *obj, int wait) |
1da177e4 LT |
103 | { |
104 | int ret = -EINVAL; | |
105 | #ifdef CONFIG_ADFS_FS_RW | |
0125f504 | 106 | const struct adfs_dir_ops *ops = ADFS_SB(sb)->s_dir; |
1da177e4 LT |
107 | struct adfs_dir dir; |
108 | ||
109 | printk(KERN_INFO "adfs_dir_update: object %06X in dir %06X\n", | |
110 | obj->file_id, obj->parent_id); | |
111 | ||
112 | if (!ops->update) { | |
113 | ret = -EINVAL; | |
114 | goto out; | |
115 | } | |
116 | ||
117 | ret = ops->read(sb, obj->parent_id, 0, &dir); | |
118 | if (ret) | |
119 | goto out; | |
120 | ||
121 | write_lock(&adfs_dir_lock); | |
122 | ret = ops->update(&dir, obj); | |
123 | write_unlock(&adfs_dir_lock); | |
124 | ||
ffdc9064 AV |
125 | if (wait) { |
126 | int err = ops->sync(&dir); | |
127 | if (!ret) | |
128 | ret = err; | |
129 | } | |
130 | ||
1da177e4 LT |
131 | ops->free(&dir); |
132 | out: | |
133 | #endif | |
134 | return ret; | |
135 | } | |
136 | ||
525715d0 RK |
137 | static unsigned char adfs_tolower(unsigned char c) |
138 | { | |
139 | if (c >= 'A' && c <= 'Z') | |
140 | c += 'a' - 'A'; | |
141 | return c; | |
142 | } | |
143 | ||
1e504cf8 RK |
144 | static int __adfs_compare(const unsigned char *qstr, u32 qlen, |
145 | const char *str, u32 len) | |
1da177e4 | 146 | { |
1e504cf8 | 147 | u32 i; |
1da177e4 | 148 | |
1e504cf8 RK |
149 | if (qlen != len) |
150 | return 1; | |
1da177e4 | 151 | |
525715d0 RK |
152 | for (i = 0; i < qlen; i++) |
153 | if (adfs_tolower(qstr[i]) != adfs_tolower(str[i])) | |
1e504cf8 | 154 | return 1; |
525715d0 | 155 | |
1e504cf8 | 156 | return 0; |
1da177e4 LT |
157 | } |
158 | ||
1e504cf8 RK |
159 | static int adfs_dir_lookup_byname(struct inode *inode, const struct qstr *qstr, |
160 | struct object_info *obj) | |
1da177e4 LT |
161 | { |
162 | struct super_block *sb = inode->i_sb; | |
0125f504 | 163 | const struct adfs_dir_ops *ops = ADFS_SB(sb)->s_dir; |
1e504cf8 | 164 | const unsigned char *name; |
1da177e4 | 165 | struct adfs_dir dir; |
1e504cf8 | 166 | u32 name_len; |
1da177e4 LT |
167 | int ret; |
168 | ||
169 | ret = ops->read(sb, inode->i_ino, inode->i_size, &dir); | |
170 | if (ret) | |
171 | goto out; | |
172 | ||
173 | if (ADFS_I(inode)->parent_id != dir.parent_id) { | |
19bdd41a | 174 | adfs_error(sb, "parent directory changed under me! (%lx but got %x)\n", |
1da177e4 LT |
175 | ADFS_I(inode)->parent_id, dir.parent_id); |
176 | ret = -EIO; | |
177 | goto free_out; | |
178 | } | |
179 | ||
180 | obj->parent_id = inode->i_ino; | |
181 | ||
1da177e4 LT |
182 | read_lock(&adfs_dir_lock); |
183 | ||
184 | ret = ops->setpos(&dir, 0); | |
185 | if (ret) | |
186 | goto unlock_out; | |
187 | ||
188 | ret = -ENOENT; | |
1e504cf8 RK |
189 | name = qstr->name; |
190 | name_len = qstr->len; | |
1da177e4 | 191 | while (ops->getnext(&dir, obj) == 0) { |
1e504cf8 | 192 | if (!__adfs_compare(name, name_len, obj->name, obj->name_len)) { |
1da177e4 LT |
193 | ret = 0; |
194 | break; | |
195 | } | |
196 | } | |
197 | ||
198 | unlock_out: | |
199 | read_unlock(&adfs_dir_lock); | |
200 | ||
201 | free_out: | |
202 | ops->free(&dir); | |
203 | out: | |
204 | return ret; | |
205 | } | |
206 | ||
4b6f5d20 | 207 | const struct file_operations adfs_dir_operations = { |
1da177e4 | 208 | .read = generic_read_dir, |
59af1584 | 209 | .llseek = generic_file_llseek, |
2638ffba | 210 | .iterate = adfs_readdir, |
1b061d92 | 211 | .fsync = generic_file_fsync, |
1da177e4 LT |
212 | }; |
213 | ||
214 | static int | |
da53be12 | 215 | adfs_hash(const struct dentry *parent, struct qstr *qstr) |
1da177e4 | 216 | { |
1da177e4 LT |
217 | const unsigned char *name; |
218 | unsigned long hash; | |
2eb0684f | 219 | u32 len; |
1da177e4 | 220 | |
2eb0684f RK |
221 | if (qstr->len > ADFS_SB(parent->d_sb)->s_namelen) |
222 | return -ENAMETOOLONG; | |
1da177e4 | 223 | |
2eb0684f | 224 | len = qstr->len; |
1da177e4 | 225 | name = qstr->name; |
8387ff25 | 226 | hash = init_name_hash(parent); |
2eb0684f | 227 | while (len--) |
525715d0 | 228 | hash = partial_name_hash(adfs_tolower(*name++), hash); |
1da177e4 LT |
229 | qstr->hash = end_name_hash(hash); |
230 | ||
231 | return 0; | |
232 | } | |
233 | ||
234 | /* | |
235 | * Compare two names, taking note of the name length | |
236 | * requirements of the underlying filesystem. | |
237 | */ | |
1e504cf8 RK |
238 | static int adfs_compare(const struct dentry *dentry, unsigned int len, |
239 | const char *str, const struct qstr *qstr) | |
1da177e4 | 240 | { |
1e504cf8 | 241 | return __adfs_compare(qstr->name, qstr->len, str, len); |
1da177e4 LT |
242 | } |
243 | ||
e16404ed | 244 | const struct dentry_operations adfs_dentry_operations = { |
1da177e4 LT |
245 | .d_hash = adfs_hash, |
246 | .d_compare = adfs_compare, | |
247 | }; | |
248 | ||
249 | static struct dentry * | |
00cd8dd3 | 250 | adfs_lookup(struct inode *dir, struct dentry *dentry, unsigned int flags) |
1da177e4 LT |
251 | { |
252 | struct inode *inode = NULL; | |
253 | struct object_info obj; | |
254 | int error; | |
255 | ||
1da177e4 LT |
256 | error = adfs_dir_lookup_byname(dir, &dentry->d_name, &obj); |
257 | if (error == 0) { | |
1da177e4 LT |
258 | /* |
259 | * This only returns NULL if get_empty_inode | |
260 | * fails. | |
261 | */ | |
262 | inode = adfs_iget(dir->i_sb, &obj); | |
9a7dddca AV |
263 | if (!inode) |
264 | inode = ERR_PTR(-EACCES); | |
265 | } else if (error != -ENOENT) { | |
266 | inode = ERR_PTR(error); | |
1da177e4 | 267 | } |
9a7dddca | 268 | return d_splice_alias(inode, dentry); |
1da177e4 LT |
269 | } |
270 | ||
271 | /* | |
272 | * directories can handle most operations... | |
273 | */ | |
754661f1 | 274 | const struct inode_operations adfs_dir_inode_operations = { |
1da177e4 LT |
275 | .lookup = adfs_lookup, |
276 | .setattr = adfs_notify_change, | |
277 | }; |