Commit | Line | Data |
---|---|---|
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 | ||
1a67aafb | 36 | static int minix_mknod(struct inode * dir, struct dentry *dentry, umode_t mode, dev_t rdev) |
1da177e4 LT |
37 | { |
38 | int error; | |
39 | struct inode *inode; | |
40 | ||
41 | if (!old_valid_dev(rdev)) | |
42 | return -EINVAL; | |
43 | ||
9eed1fb7 | 44 | inode = minix_new_inode(dir, mode, &error); |
1da177e4 LT |
45 | |
46 | if (inode) { | |
1da177e4 LT |
47 | minix_set_inode(inode, rdev); |
48 | mark_inode_dirty(inode); | |
49 | error = add_nondir(dentry, inode); | |
50 | } | |
51 | return error; | |
52 | } | |
53 | ||
60545d0d AV |
54 | static int minix_tmpfile(struct inode *dir, struct dentry *dentry, umode_t mode) |
55 | { | |
56 | int error; | |
57 | struct inode *inode = minix_new_inode(dir, mode, &error); | |
58 | if (inode) { | |
59 | minix_set_inode(inode, 0); | |
60 | mark_inode_dirty(inode); | |
61 | d_tmpfile(dentry, inode); | |
62 | } | |
63 | return error; | |
64 | } | |
65 | ||
4acdaf27 | 66 | static int minix_create(struct inode *dir, struct dentry *dentry, umode_t mode, |
ebfc3b49 | 67 | bool excl) |
1da177e4 LT |
68 | { |
69 | return minix_mknod(dir, dentry, mode, 0); | |
70 | } | |
71 | ||
72 | static int minix_symlink(struct inode * dir, struct dentry *dentry, | |
73 | const char * symname) | |
74 | { | |
75 | int err = -ENAMETOOLONG; | |
76 | int i = strlen(symname)+1; | |
77 | struct inode * inode; | |
78 | ||
79 | if (i > dir->i_sb->s_blocksize) | |
80 | goto out; | |
81 | ||
9eed1fb7 | 82 | inode = minix_new_inode(dir, S_IFLNK | 0777, &err); |
1da177e4 LT |
83 | if (!inode) |
84 | goto out; | |
85 | ||
1da177e4 LT |
86 | minix_set_inode(inode, 0); |
87 | err = page_symlink(inode, symname, i); | |
88 | if (err) | |
89 | goto out_fail; | |
90 | ||
91 | err = add_nondir(dentry, inode); | |
92 | out: | |
93 | return err; | |
94 | ||
95 | out_fail: | |
78ec7b69 | 96 | inode_dec_link_count(inode); |
1da177e4 LT |
97 | iput(inode); |
98 | goto out; | |
99 | } | |
100 | ||
101 | static int minix_link(struct dentry * old_dentry, struct inode * dir, | |
102 | struct dentry *dentry) | |
103 | { | |
2b0143b5 | 104 | struct inode *inode = d_inode(old_dentry); |
1da177e4 | 105 | |
02027d42 | 106 | inode->i_ctime = current_time(inode); |
78ec7b69 | 107 | inode_inc_link_count(inode); |
7de9c6ee | 108 | ihold(inode); |
1da177e4 LT |
109 | return add_nondir(dentry, inode); |
110 | } | |
111 | ||
18bb1db3 | 112 | static int minix_mkdir(struct inode * dir, struct dentry *dentry, umode_t mode) |
1da177e4 LT |
113 | { |
114 | struct inode * inode; | |
8de52778 | 115 | int err; |
1da177e4 | 116 | |
78ec7b69 | 117 | inode_inc_link_count(dir); |
1da177e4 | 118 | |
eee743fd | 119 | inode = minix_new_inode(dir, S_IFDIR | mode, &err); |
1da177e4 LT |
120 | if (!inode) |
121 | goto out_dir; | |
122 | ||
1da177e4 LT |
123 | minix_set_inode(inode, 0); |
124 | ||
78ec7b69 | 125 | inode_inc_link_count(inode); |
1da177e4 LT |
126 | |
127 | err = minix_make_empty(inode, dir); | |
128 | if (err) | |
129 | goto out_fail; | |
130 | ||
131 | err = minix_add_link(dentry, inode); | |
132 | if (err) | |
133 | goto out_fail; | |
134 | ||
135 | d_instantiate(dentry, inode); | |
136 | out: | |
137 | return err; | |
138 | ||
139 | out_fail: | |
78ec7b69 AD |
140 | inode_dec_link_count(inode); |
141 | inode_dec_link_count(inode); | |
1da177e4 LT |
142 | iput(inode); |
143 | out_dir: | |
78ec7b69 | 144 | inode_dec_link_count(dir); |
1da177e4 LT |
145 | goto out; |
146 | } | |
147 | ||
148 | static int minix_unlink(struct inode * dir, struct dentry *dentry) | |
149 | { | |
150 | int err = -ENOENT; | |
2b0143b5 | 151 | struct inode * inode = d_inode(dentry); |
1da177e4 LT |
152 | struct page * page; |
153 | struct minix_dir_entry * de; | |
154 | ||
155 | de = minix_find_entry(dentry, &page); | |
156 | if (!de) | |
157 | goto end_unlink; | |
158 | ||
159 | err = minix_delete_entry(de, page); | |
160 | if (err) | |
161 | goto end_unlink; | |
162 | ||
163 | inode->i_ctime = dir->i_ctime; | |
78ec7b69 | 164 | inode_dec_link_count(inode); |
1da177e4 LT |
165 | end_unlink: |
166 | return err; | |
167 | } | |
168 | ||
169 | static int minix_rmdir(struct inode * dir, struct dentry *dentry) | |
170 | { | |
2b0143b5 | 171 | struct inode * inode = d_inode(dentry); |
1da177e4 LT |
172 | int err = -ENOTEMPTY; |
173 | ||
174 | if (minix_empty_dir(inode)) { | |
175 | err = minix_unlink(dir, dentry); | |
176 | if (!err) { | |
78ec7b69 AD |
177 | inode_dec_link_count(dir); |
178 | inode_dec_link_count(inode); | |
1da177e4 LT |
179 | } |
180 | } | |
181 | return err; | |
182 | } | |
183 | ||
184 | static int minix_rename(struct inode * old_dir, struct dentry *old_dentry, | |
f03b8ad8 MS |
185 | struct inode * new_dir, struct dentry *new_dentry, |
186 | unsigned int flags) | |
1da177e4 | 187 | { |
2b0143b5 DH |
188 | struct inode * old_inode = d_inode(old_dentry); |
189 | struct inode * new_inode = d_inode(new_dentry); | |
1da177e4 LT |
190 | struct page * dir_page = NULL; |
191 | struct minix_dir_entry * dir_de = NULL; | |
192 | struct page * old_page; | |
193 | struct minix_dir_entry * old_de; | |
194 | int err = -ENOENT; | |
195 | ||
f03b8ad8 MS |
196 | if (flags & ~RENAME_NOREPLACE) |
197 | return -EINVAL; | |
198 | ||
1da177e4 LT |
199 | old_de = minix_find_entry(old_dentry, &old_page); |
200 | if (!old_de) | |
201 | goto out; | |
202 | ||
203 | if (S_ISDIR(old_inode->i_mode)) { | |
204 | err = -EIO; | |
205 | dir_de = minix_dotdot(old_inode, &dir_page); | |
206 | if (!dir_de) | |
207 | goto out_old; | |
208 | } | |
209 | ||
210 | if (new_inode) { | |
211 | struct page * new_page; | |
212 | struct minix_dir_entry * new_de; | |
213 | ||
214 | err = -ENOTEMPTY; | |
215 | if (dir_de && !minix_empty_dir(new_inode)) | |
216 | goto out_dir; | |
217 | ||
218 | err = -ENOENT; | |
219 | new_de = minix_find_entry(new_dentry, &new_page); | |
220 | if (!new_de) | |
221 | goto out_dir; | |
1da177e4 | 222 | minix_set_link(new_de, new_page, old_inode); |
02027d42 | 223 | new_inode->i_ctime = current_time(new_inode); |
1da177e4 | 224 | if (dir_de) |
9a53c3a7 | 225 | drop_nlink(new_inode); |
78ec7b69 | 226 | inode_dec_link_count(new_inode); |
1da177e4 | 227 | } else { |
1da177e4 | 228 | err = minix_add_link(new_dentry, old_inode); |
6f88049c | 229 | if (err) |
1da177e4 | 230 | goto out_dir; |
1da177e4 | 231 | if (dir_de) |
78ec7b69 | 232 | inode_inc_link_count(new_dir); |
1da177e4 LT |
233 | } |
234 | ||
235 | minix_delete_entry(old_de, old_page); | |
6f88049c | 236 | mark_inode_dirty(old_inode); |
1da177e4 LT |
237 | |
238 | if (dir_de) { | |
239 | minix_set_link(dir_de, dir_page, new_dir); | |
78ec7b69 | 240 | inode_dec_link_count(old_dir); |
1da177e4 LT |
241 | } |
242 | return 0; | |
243 | ||
244 | out_dir: | |
245 | if (dir_de) { | |
246 | kunmap(dir_page); | |
09cbfeaf | 247 | put_page(dir_page); |
1da177e4 LT |
248 | } |
249 | out_old: | |
250 | kunmap(old_page); | |
09cbfeaf | 251 | put_page(old_page); |
1da177e4 LT |
252 | out: |
253 | return err; | |
254 | } | |
255 | ||
256 | /* | |
257 | * directories can handle most operations... | |
258 | */ | |
92e1d5be | 259 | const struct inode_operations minix_dir_inode_operations = { |
1da177e4 LT |
260 | .create = minix_create, |
261 | .lookup = minix_lookup, | |
262 | .link = minix_link, | |
263 | .unlink = minix_unlink, | |
264 | .symlink = minix_symlink, | |
265 | .mkdir = minix_mkdir, | |
266 | .rmdir = minix_rmdir, | |
267 | .mknod = minix_mknod, | |
268 | .rename = minix_rename, | |
269 | .getattr = minix_getattr, | |
60545d0d | 270 | .tmpfile = minix_tmpfile, |
1da177e4 | 271 | }; |