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1 | /* |
2 | * linux/fs/minix/namei.c |
3 | * |
4 | * Copyright (C) 1991, 1992 Linus Torvalds |
5 | */ |
6 | |
7 | #include "minix.h" |
8 | |
9 | static int add_nondir(struct dentry *dentry, struct inode *inode) |
10 | { |
11 | int err = minix_add_link(dentry, inode); |
12 | if (!err) { |
13 | d_instantiate(dentry, inode); |
14 | return 0; |
15 | } |
16 | inode_dec_link_count(inode); |
17 | iput(inode); |
18 | return err; |
19 | } |
20 | |
21 | static struct dentry *minix_lookup(struct inode * dir, struct dentry *dentry, struct nameidata *nd) |
22 | { |
23 | struct inode * inode = NULL; |
24 | ino_t ino; |
25 | |
26 | dentry->d_op = dir->i_sb->s_root->d_op; |
27 | |
28 | if (dentry->d_name.len > minix_sb(dir->i_sb)->s_namelen) |
29 | return ERR_PTR(-ENAMETOOLONG); |
30 | |
31 | ino = minix_inode_by_name(dentry); |
32 | if (ino) { |
33 | inode = minix_iget(dir->i_sb, ino); |
34 | if (IS_ERR(inode)) |
35 | return ERR_CAST(inode); |
36 | } |
37 | d_add(dentry, inode); |
38 | return NULL; |
39 | } |
40 | |
41 | static int minix_mknod(struct inode * dir, struct dentry *dentry, int mode, dev_t rdev) |
42 | { |
43 | int error; |
44 | struct inode *inode; |
45 | |
46 | if (!old_valid_dev(rdev)) |
47 | return -EINVAL; |
48 | |
49 | inode = minix_new_inode(dir, &error); |
50 | |
51 | if (inode) { |
52 | inode->i_mode = mode; |
53 | minix_set_inode(inode, rdev); |
54 | mark_inode_dirty(inode); |
55 | error = add_nondir(dentry, inode); |
56 | } |
57 | return error; |
58 | } |
59 | |
60 | static int minix_create(struct inode * dir, struct dentry *dentry, int mode, |
61 | struct nameidata *nd) |
62 | { |
63 | return minix_mknod(dir, dentry, mode, 0); |
64 | } |
65 | |
66 | static int minix_symlink(struct inode * dir, struct dentry *dentry, |
67 | const char * symname) |
68 | { |
69 | int err = -ENAMETOOLONG; |
70 | int i = strlen(symname)+1; |
71 | struct inode * inode; |
72 | |
73 | if (i > dir->i_sb->s_blocksize) |
74 | goto out; |
75 | |
76 | inode = minix_new_inode(dir, &err); |
77 | if (!inode) |
78 | goto out; |
79 | |
80 | inode->i_mode = S_IFLNK | 0777; |
81 | minix_set_inode(inode, 0); |
82 | err = page_symlink(inode, symname, i); |
83 | if (err) |
84 | goto out_fail; |
85 | |
86 | err = add_nondir(dentry, inode); |
87 | out: |
88 | return err; |
89 | |
90 | out_fail: |
91 | inode_dec_link_count(inode); |
92 | iput(inode); |
93 | goto out; |
94 | } |
95 | |
96 | static int minix_link(struct dentry * old_dentry, struct inode * dir, |
97 | struct dentry *dentry) |
98 | { |
99 | struct inode *inode = old_dentry->d_inode; |
100 | |
101 | if (inode->i_nlink >= minix_sb(inode->i_sb)->s_link_max) |
102 | return -EMLINK; |
103 | |
104 | inode->i_ctime = CURRENT_TIME_SEC; |
105 | inode_inc_link_count(inode); |
106 | atomic_inc(&inode->i_count); |
107 | return add_nondir(dentry, inode); |
108 | } |
109 | |
110 | static int minix_mkdir(struct inode * dir, struct dentry *dentry, int mode) |
111 | { |
112 | struct inode * inode; |
113 | int err = -EMLINK; |
114 | |
115 | if (dir->i_nlink >= minix_sb(dir->i_sb)->s_link_max) |
116 | goto out; |
117 | |
118 | inode_inc_link_count(dir); |
119 | |
120 | inode = minix_new_inode(dir, &err); |
121 | if (!inode) |
122 | goto out_dir; |
123 | |
124 | inode->i_mode = S_IFDIR | mode; |
125 | if (dir->i_mode & S_ISGID) |
126 | inode->i_mode |= S_ISGID; |
127 | minix_set_inode(inode, 0); |
128 | |
129 | inode_inc_link_count(inode); |
130 | |
131 | err = minix_make_empty(inode, dir); |
132 | if (err) |
133 | goto out_fail; |
134 | |
135 | err = minix_add_link(dentry, inode); |
136 | if (err) |
137 | goto out_fail; |
138 | |
139 | d_instantiate(dentry, inode); |
140 | out: |
141 | return err; |
142 | |
143 | out_fail: |
144 | inode_dec_link_count(inode); |
145 | inode_dec_link_count(inode); |
146 | iput(inode); |
147 | out_dir: |
148 | inode_dec_link_count(dir); |
149 | goto out; |
150 | } |
151 | |
152 | static int minix_unlink(struct inode * dir, struct dentry *dentry) |
153 | { |
154 | int err = -ENOENT; |
155 | struct inode * inode = dentry->d_inode; |
156 | struct page * page; |
157 | struct minix_dir_entry * de; |
158 | |
159 | de = minix_find_entry(dentry, &page); |
160 | if (!de) |
161 | goto end_unlink; |
162 | |
163 | err = minix_delete_entry(de, page); |
164 | if (err) |
165 | goto end_unlink; |
166 | |
167 | inode->i_ctime = dir->i_ctime; |
168 | inode_dec_link_count(inode); |
169 | end_unlink: |
170 | return err; |
171 | } |
172 | |
173 | static int minix_rmdir(struct inode * dir, struct dentry *dentry) |
174 | { |
175 | struct inode * inode = dentry->d_inode; |
176 | int err = -ENOTEMPTY; |
177 | |
178 | if (minix_empty_dir(inode)) { |
179 | err = minix_unlink(dir, dentry); |
180 | if (!err) { |
181 | inode_dec_link_count(dir); |
182 | inode_dec_link_count(inode); |
183 | } |
184 | } |
185 | return err; |
186 | } |
187 | |
188 | static int minix_rename(struct inode * old_dir, struct dentry *old_dentry, |
189 | struct inode * new_dir, struct dentry *new_dentry) |
190 | { |
191 | struct minix_sb_info * info = minix_sb(old_dir->i_sb); |
192 | struct inode * old_inode = old_dentry->d_inode; |
193 | struct inode * new_inode = new_dentry->d_inode; |
194 | struct page * dir_page = NULL; |
195 | struct minix_dir_entry * dir_de = NULL; |
196 | struct page * old_page; |
197 | struct minix_dir_entry * old_de; |
198 | int err = -ENOENT; |
199 | |
200 | old_de = minix_find_entry(old_dentry, &old_page); |
201 | if (!old_de) |
202 | goto out; |
203 | |
204 | if (S_ISDIR(old_inode->i_mode)) { |
205 | err = -EIO; |
206 | dir_de = minix_dotdot(old_inode, &dir_page); |
207 | if (!dir_de) |
208 | goto out_old; |
209 | } |
210 | |
211 | if (new_inode) { |
212 | struct page * new_page; |
213 | struct minix_dir_entry * new_de; |
214 | |
215 | err = -ENOTEMPTY; |
216 | if (dir_de && !minix_empty_dir(new_inode)) |
217 | goto out_dir; |
218 | |
219 | err = -ENOENT; |
220 | new_de = minix_find_entry(new_dentry, &new_page); |
221 | if (!new_de) |
222 | goto out_dir; |
223 | inode_inc_link_count(old_inode); |
224 | minix_set_link(new_de, new_page, old_inode); |
225 | new_inode->i_ctime = CURRENT_TIME_SEC; |
226 | if (dir_de) |
227 | drop_nlink(new_inode); |
228 | inode_dec_link_count(new_inode); |
229 | } else { |
230 | if (dir_de) { |
231 | err = -EMLINK; |
232 | if (new_dir->i_nlink >= info->s_link_max) |
233 | goto out_dir; |
234 | } |
235 | inode_inc_link_count(old_inode); |
236 | err = minix_add_link(new_dentry, old_inode); |
237 | if (err) { |
238 | inode_dec_link_count(old_inode); |
239 | goto out_dir; |
240 | } |
241 | if (dir_de) |
242 | inode_inc_link_count(new_dir); |
243 | } |
244 | |
245 | minix_delete_entry(old_de, old_page); |
246 | inode_dec_link_count(old_inode); |
247 | |
248 | if (dir_de) { |
249 | minix_set_link(dir_de, dir_page, new_dir); |
250 | inode_dec_link_count(old_dir); |
251 | } |
252 | return 0; |
253 | |
254 | out_dir: |
255 | if (dir_de) { |
256 | kunmap(dir_page); |
257 | page_cache_release(dir_page); |
258 | } |
259 | out_old: |
260 | kunmap(old_page); |
261 | page_cache_release(old_page); |
262 | out: |
263 | return err; |
264 | } |
265 | |
266 | /* |
267 | * directories can handle most operations... |
268 | */ |
269 | const struct inode_operations minix_dir_inode_operations = { |
270 | .create = minix_create, |
271 | .lookup = minix_lookup, |
272 | .link = minix_link, |
273 | .unlink = minix_unlink, |
274 | .symlink = minix_symlink, |
275 | .mkdir = minix_mkdir, |
276 | .rmdir = minix_rmdir, |
277 | .mknod = minix_mknod, |
278 | .rename = minix_rename, |
279 | .getattr = minix_getattr, |
280 | }; |
281 |
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