Commit | Line | Data |
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b2441318 | 1 | // SPDX-License-Identifier: GPL-2.0 |
1da177e4 LT |
2 | /* |
3 | * linux/fs/minix/namei.c | |
4 | * | |
5 | * Copyright (C) 1991, 1992 Linus Torvalds | |
6 | */ | |
7 | ||
8 | #include "minix.h" | |
9 | ||
1da177e4 LT |
10 | static int add_nondir(struct dentry *dentry, struct inode *inode) |
11 | { | |
12 | int err = minix_add_link(dentry, inode); | |
13 | if (!err) { | |
14 | d_instantiate(dentry, inode); | |
15 | return 0; | |
16 | } | |
78ec7b69 | 17 | inode_dec_link_count(inode); |
1da177e4 LT |
18 | iput(inode); |
19 | return err; | |
20 | } | |
21 | ||
00cd8dd3 | 22 | static struct dentry *minix_lookup(struct inode * dir, struct dentry *dentry, unsigned int flags) |
1da177e4 LT |
23 | { |
24 | struct inode * inode = NULL; | |
25 | ino_t ino; | |
26 | ||
1da177e4 LT |
27 | if (dentry->d_name.len > minix_sb(dir->i_sb)->s_namelen) |
28 | return ERR_PTR(-ENAMETOOLONG); | |
29 | ||
30 | ino = minix_inode_by_name(dentry); | |
b0149516 | 31 | if (ino) |
a90a0880 | 32 | inode = minix_iget(dir->i_sb, ino); |
b0149516 | 33 | return d_splice_alias(inode, dentry); |
1da177e4 LT |
34 | } |
35 | ||
549c7297 CB |
36 | static int minix_mknod(struct user_namespace *mnt_userns, struct inode *dir, |
37 | struct dentry *dentry, umode_t mode, dev_t rdev) | |
1da177e4 LT |
38 | { |
39 | int error; | |
40 | struct inode *inode; | |
41 | ||
42 | if (!old_valid_dev(rdev)) | |
43 | return -EINVAL; | |
44 | ||
9eed1fb7 | 45 | inode = minix_new_inode(dir, mode, &error); |
1da177e4 LT |
46 | |
47 | if (inode) { | |
1da177e4 LT |
48 | minix_set_inode(inode, rdev); |
49 | mark_inode_dirty(inode); | |
50 | error = add_nondir(dentry, inode); | |
51 | } | |
52 | return error; | |
53 | } | |
54 | ||
549c7297 | 55 | static int minix_tmpfile(struct user_namespace *mnt_userns, struct inode *dir, |
863f144f | 56 | struct file *file, umode_t mode) |
60545d0d AV |
57 | { |
58 | int error; | |
59 | struct inode *inode = minix_new_inode(dir, mode, &error); | |
60 | if (inode) { | |
61 | minix_set_inode(inode, 0); | |
62 | mark_inode_dirty(inode); | |
863f144f | 63 | d_tmpfile(file, inode); |
60545d0d | 64 | } |
863f144f | 65 | return finish_open_simple(file, error); |
60545d0d AV |
66 | } |
67 | ||
549c7297 CB |
68 | static int minix_create(struct user_namespace *mnt_userns, struct inode *dir, |
69 | struct dentry *dentry, umode_t mode, bool excl) | |
1da177e4 | 70 | { |
549c7297 | 71 | return minix_mknod(mnt_userns, dir, dentry, mode, 0); |
1da177e4 LT |
72 | } |
73 | ||
549c7297 CB |
74 | static int minix_symlink(struct user_namespace *mnt_userns, struct inode *dir, |
75 | struct dentry *dentry, const char *symname) | |
1da177e4 LT |
76 | { |
77 | int err = -ENAMETOOLONG; | |
78 | int i = strlen(symname)+1; | |
79 | struct inode * inode; | |
80 | ||
81 | if (i > dir->i_sb->s_blocksize) | |
82 | goto out; | |
83 | ||
9eed1fb7 | 84 | inode = minix_new_inode(dir, S_IFLNK | 0777, &err); |
1da177e4 LT |
85 | if (!inode) |
86 | goto out; | |
87 | ||
1da177e4 LT |
88 | minix_set_inode(inode, 0); |
89 | err = page_symlink(inode, symname, i); | |
90 | if (err) | |
91 | goto out_fail; | |
92 | ||
93 | err = add_nondir(dentry, inode); | |
94 | out: | |
95 | return err; | |
96 | ||
97 | out_fail: | |
78ec7b69 | 98 | inode_dec_link_count(inode); |
1da177e4 LT |
99 | iput(inode); |
100 | goto out; | |
101 | } | |
102 | ||
103 | static int minix_link(struct dentry * old_dentry, struct inode * dir, | |
104 | struct dentry *dentry) | |
105 | { | |
2b0143b5 | 106 | struct inode *inode = d_inode(old_dentry); |
1da177e4 | 107 | |
02027d42 | 108 | inode->i_ctime = current_time(inode); |
78ec7b69 | 109 | inode_inc_link_count(inode); |
7de9c6ee | 110 | ihold(inode); |
1da177e4 LT |
111 | return add_nondir(dentry, inode); |
112 | } | |
113 | ||
549c7297 CB |
114 | static int minix_mkdir(struct user_namespace *mnt_userns, struct inode *dir, |
115 | struct dentry *dentry, umode_t mode) | |
1da177e4 LT |
116 | { |
117 | struct inode * inode; | |
8de52778 | 118 | int err; |
1da177e4 | 119 | |
78ec7b69 | 120 | inode_inc_link_count(dir); |
1da177e4 | 121 | |
eee743fd | 122 | inode = minix_new_inode(dir, S_IFDIR | mode, &err); |
1da177e4 LT |
123 | if (!inode) |
124 | goto out_dir; | |
125 | ||
1da177e4 LT |
126 | minix_set_inode(inode, 0); |
127 | ||
78ec7b69 | 128 | inode_inc_link_count(inode); |
1da177e4 LT |
129 | |
130 | err = minix_make_empty(inode, dir); | |
131 | if (err) | |
132 | goto out_fail; | |
133 | ||
134 | err = minix_add_link(dentry, inode); | |
135 | if (err) | |
136 | goto out_fail; | |
137 | ||
138 | d_instantiate(dentry, inode); | |
139 | out: | |
140 | return err; | |
141 | ||
142 | out_fail: | |
78ec7b69 AD |
143 | inode_dec_link_count(inode); |
144 | inode_dec_link_count(inode); | |
1da177e4 LT |
145 | iput(inode); |
146 | out_dir: | |
78ec7b69 | 147 | inode_dec_link_count(dir); |
1da177e4 LT |
148 | goto out; |
149 | } | |
150 | ||
151 | static int minix_unlink(struct inode * dir, struct dentry *dentry) | |
152 | { | |
153 | int err = -ENOENT; | |
2b0143b5 | 154 | struct inode * inode = d_inode(dentry); |
1da177e4 LT |
155 | struct page * page; |
156 | struct minix_dir_entry * de; | |
157 | ||
158 | de = minix_find_entry(dentry, &page); | |
159 | if (!de) | |
160 | goto end_unlink; | |
161 | ||
162 | err = minix_delete_entry(de, page); | |
163 | if (err) | |
164 | goto end_unlink; | |
165 | ||
166 | inode->i_ctime = dir->i_ctime; | |
78ec7b69 | 167 | inode_dec_link_count(inode); |
1da177e4 LT |
168 | end_unlink: |
169 | return err; | |
170 | } | |
171 | ||
172 | static int minix_rmdir(struct inode * dir, struct dentry *dentry) | |
173 | { | |
2b0143b5 | 174 | struct inode * inode = d_inode(dentry); |
1da177e4 LT |
175 | int err = -ENOTEMPTY; |
176 | ||
177 | if (minix_empty_dir(inode)) { | |
178 | err = minix_unlink(dir, dentry); | |
179 | if (!err) { | |
78ec7b69 AD |
180 | inode_dec_link_count(dir); |
181 | inode_dec_link_count(inode); | |
1da177e4 LT |
182 | } |
183 | } | |
184 | return err; | |
185 | } | |
186 | ||
549c7297 CB |
187 | static int minix_rename(struct user_namespace *mnt_userns, |
188 | struct inode *old_dir, struct dentry *old_dentry, | |
189 | struct inode *new_dir, struct dentry *new_dentry, | |
f03b8ad8 | 190 | unsigned int flags) |
1da177e4 | 191 | { |
2b0143b5 DH |
192 | struct inode * old_inode = d_inode(old_dentry); |
193 | struct inode * new_inode = d_inode(new_dentry); | |
1da177e4 LT |
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 | ||
f03b8ad8 MS |
200 | if (flags & ~RENAME_NOREPLACE) |
201 | return -EINVAL; | |
202 | ||
1da177e4 LT |
203 | old_de = minix_find_entry(old_dentry, &old_page); |
204 | if (!old_de) | |
205 | goto out; | |
206 | ||
207 | if (S_ISDIR(old_inode->i_mode)) { | |
208 | err = -EIO; | |
209 | dir_de = minix_dotdot(old_inode, &dir_page); | |
210 | if (!dir_de) | |
211 | goto out_old; | |
212 | } | |
213 | ||
214 | if (new_inode) { | |
215 | struct page * new_page; | |
216 | struct minix_dir_entry * new_de; | |
217 | ||
218 | err = -ENOTEMPTY; | |
219 | if (dir_de && !minix_empty_dir(new_inode)) | |
220 | goto out_dir; | |
221 | ||
222 | err = -ENOENT; | |
223 | new_de = minix_find_entry(new_dentry, &new_page); | |
224 | if (!new_de) | |
225 | goto out_dir; | |
1da177e4 | 226 | minix_set_link(new_de, new_page, old_inode); |
02027d42 | 227 | new_inode->i_ctime = current_time(new_inode); |
1da177e4 | 228 | if (dir_de) |
9a53c3a7 | 229 | drop_nlink(new_inode); |
78ec7b69 | 230 | inode_dec_link_count(new_inode); |
1da177e4 | 231 | } else { |
1da177e4 | 232 | err = minix_add_link(new_dentry, old_inode); |
6f88049c | 233 | if (err) |
1da177e4 | 234 | goto out_dir; |
1da177e4 | 235 | if (dir_de) |
78ec7b69 | 236 | inode_inc_link_count(new_dir); |
1da177e4 LT |
237 | } |
238 | ||
239 | minix_delete_entry(old_de, old_page); | |
6f88049c | 240 | mark_inode_dirty(old_inode); |
1da177e4 LT |
241 | |
242 | if (dir_de) { | |
243 | minix_set_link(dir_de, dir_page, new_dir); | |
78ec7b69 | 244 | inode_dec_link_count(old_dir); |
1da177e4 LT |
245 | } |
246 | return 0; | |
247 | ||
248 | out_dir: | |
249 | if (dir_de) { | |
250 | kunmap(dir_page); | |
09cbfeaf | 251 | put_page(dir_page); |
1da177e4 LT |
252 | } |
253 | out_old: | |
254 | kunmap(old_page); | |
09cbfeaf | 255 | put_page(old_page); |
1da177e4 LT |
256 | out: |
257 | return err; | |
258 | } | |
259 | ||
260 | /* | |
261 | * directories can handle most operations... | |
262 | */ | |
92e1d5be | 263 | const struct inode_operations minix_dir_inode_operations = { |
1da177e4 LT |
264 | .create = minix_create, |
265 | .lookup = minix_lookup, | |
266 | .link = minix_link, | |
267 | .unlink = minix_unlink, | |
268 | .symlink = minix_symlink, | |
269 | .mkdir = minix_mkdir, | |
270 | .rmdir = minix_rmdir, | |
271 | .mknod = minix_mknod, | |
272 | .rename = minix_rename, | |
273 | .getattr = minix_getattr, | |
60545d0d | 274 | .tmpfile = minix_tmpfile, |
1da177e4 | 275 | }; |