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Commit | Line | Data |
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b2441318 | 1 | // SPDX-License-Identifier: GPL-2.0 |
1da177e4 LT |
2 | /* |
3 | * linux/fs/sysv/namei.c | |
4 | * | |
5 | * minix/namei.c | |
6 | * Copyright (C) 1991, 1992 Linus Torvalds | |
7 | * | |
8 | * coh/namei.c | |
9 | * Copyright (C) 1993 Pascal Haible, Bruno Haible | |
10 | * | |
11 | * sysv/namei.c | |
12 | * Copyright (C) 1993 Bruno Haible | |
13 | * Copyright (C) 1997, 1998 Krzysztof G. Baranowski | |
14 | */ | |
15 | ||
16 | #include <linux/pagemap.h> | |
1da177e4 LT |
17 | #include "sysv.h" |
18 | ||
1da177e4 LT |
19 | static int add_nondir(struct dentry *dentry, struct inode *inode) |
20 | { | |
21 | int err = sysv_add_link(dentry, inode); | |
22 | if (!err) { | |
23 | d_instantiate(dentry, inode); | |
24 | return 0; | |
25 | } | |
4e907c3d | 26 | inode_dec_link_count(inode); |
1da177e4 LT |
27 | iput(inode); |
28 | return err; | |
29 | } | |
30 | ||
00cd8dd3 | 31 | static struct dentry *sysv_lookup(struct inode * dir, struct dentry * dentry, unsigned int flags) |
1da177e4 LT |
32 | { |
33 | struct inode * inode = NULL; | |
34 | ino_t ino; | |
35 | ||
1da177e4 LT |
36 | if (dentry->d_name.len > SYSV_NAMELEN) |
37 | return ERR_PTR(-ENAMETOOLONG); | |
38 | ino = sysv_inode_by_name(dentry); | |
5bf35449 | 39 | if (ino) |
b8e1343f | 40 | inode = sysv_iget(dir->i_sb, ino); |
5bf35449 | 41 | return d_splice_alias(inode, dentry); |
1da177e4 LT |
42 | } |
43 | ||
1a67aafb | 44 | static int sysv_mknod(struct inode * dir, struct dentry * dentry, umode_t mode, dev_t rdev) |
1da177e4 LT |
45 | { |
46 | struct inode * inode; | |
47 | int err; | |
48 | ||
49 | if (!old_valid_dev(rdev)) | |
50 | return -EINVAL; | |
51 | ||
52 | inode = sysv_new_inode(dir, mode); | |
53 | err = PTR_ERR(inode); | |
54 | ||
55 | if (!IS_ERR(inode)) { | |
56 | sysv_set_inode(inode, rdev); | |
57 | mark_inode_dirty(inode); | |
58 | err = add_nondir(dentry, inode); | |
59 | } | |
60 | return err; | |
61 | } | |
62 | ||
ebfc3b49 | 63 | static int sysv_create(struct inode * dir, struct dentry * dentry, umode_t mode, bool excl) |
1da177e4 LT |
64 | { |
65 | return sysv_mknod(dir, dentry, mode, 0); | |
66 | } | |
67 | ||
68 | static int sysv_symlink(struct inode * dir, struct dentry * dentry, | |
69 | const char * symname) | |
70 | { | |
71 | int err = -ENAMETOOLONG; | |
72 | int l = strlen(symname)+1; | |
73 | struct inode * inode; | |
74 | ||
75 | if (l > dir->i_sb->s_blocksize) | |
76 | goto out; | |
77 | ||
78 | inode = sysv_new_inode(dir, S_IFLNK|0777); | |
79 | err = PTR_ERR(inode); | |
80 | if (IS_ERR(inode)) | |
81 | goto out; | |
82 | ||
83 | sysv_set_inode(inode, 0); | |
84 | err = page_symlink(inode, symname, l); | |
85 | if (err) | |
86 | goto out_fail; | |
87 | ||
88 | mark_inode_dirty(inode); | |
89 | err = add_nondir(dentry, inode); | |
90 | out: | |
91 | return err; | |
92 | ||
93 | out_fail: | |
4e907c3d | 94 | inode_dec_link_count(inode); |
1da177e4 LT |
95 | iput(inode); |
96 | goto out; | |
97 | } | |
98 | ||
99 | static int sysv_link(struct dentry * old_dentry, struct inode * dir, | |
100 | struct dentry * dentry) | |
101 | { | |
2b0143b5 | 102 | struct inode *inode = d_inode(old_dentry); |
1da177e4 | 103 | |
02027d42 | 104 | inode->i_ctime = current_time(inode); |
4e907c3d | 105 | inode_inc_link_count(inode); |
7de9c6ee | 106 | ihold(inode); |
1da177e4 LT |
107 | |
108 | return add_nondir(dentry, inode); | |
109 | } | |
110 | ||
18bb1db3 | 111 | static int sysv_mkdir(struct inode * dir, struct dentry *dentry, umode_t mode) |
1da177e4 LT |
112 | { |
113 | struct inode * inode; | |
8de52778 | 114 | int err; |
1da177e4 | 115 | |
4e907c3d | 116 | inode_inc_link_count(dir); |
1da177e4 LT |
117 | |
118 | inode = sysv_new_inode(dir, S_IFDIR|mode); | |
119 | err = PTR_ERR(inode); | |
120 | if (IS_ERR(inode)) | |
121 | goto out_dir; | |
122 | ||
123 | sysv_set_inode(inode, 0); | |
124 | ||
4e907c3d | 125 | inode_inc_link_count(inode); |
1da177e4 LT |
126 | |
127 | err = sysv_make_empty(inode, dir); | |
128 | if (err) | |
129 | goto out_fail; | |
130 | ||
131 | err = sysv_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: | |
4e907c3d AD |
140 | inode_dec_link_count(inode); |
141 | inode_dec_link_count(inode); | |
1da177e4 LT |
142 | iput(inode); |
143 | out_dir: | |
4e907c3d | 144 | inode_dec_link_count(dir); |
1da177e4 LT |
145 | goto out; |
146 | } | |
147 | ||
148 | static int sysv_unlink(struct inode * dir, struct dentry * dentry) | |
149 | { | |
2b0143b5 | 150 | struct inode * inode = d_inode(dentry); |
1da177e4 LT |
151 | struct page * page; |
152 | struct sysv_dir_entry * de; | |
153 | int err = -ENOENT; | |
154 | ||
155 | de = sysv_find_entry(dentry, &page); | |
156 | if (!de) | |
157 | goto out; | |
158 | ||
159 | err = sysv_delete_entry (de, page); | |
160 | if (err) | |
161 | goto out; | |
162 | ||
163 | inode->i_ctime = dir->i_ctime; | |
4e907c3d | 164 | inode_dec_link_count(inode); |
1da177e4 LT |
165 | out: |
166 | return err; | |
167 | } | |
168 | ||
169 | static int sysv_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 (sysv_empty_dir(inode)) { | |
175 | err = sysv_unlink(dir, dentry); | |
176 | if (!err) { | |
177 | inode->i_size = 0; | |
4e907c3d AD |
178 | inode_dec_link_count(inode); |
179 | inode_dec_link_count(dir); | |
1da177e4 LT |
180 | } |
181 | } | |
182 | return err; | |
183 | } | |
184 | ||
185 | /* | |
186 | * Anybody can rename anything with this: the permission checks are left to the | |
187 | * higher-level routines. | |
188 | */ | |
189 | static int sysv_rename(struct inode * old_dir, struct dentry * old_dentry, | |
f03b8ad8 MS |
190 | struct inode * new_dir, struct dentry * new_dentry, |
191 | unsigned int flags) | |
1da177e4 | 192 | { |
2b0143b5 DH |
193 | struct inode * old_inode = d_inode(old_dentry); |
194 | struct inode * new_inode = d_inode(new_dentry); | |
1da177e4 LT |
195 | struct page * dir_page = NULL; |
196 | struct sysv_dir_entry * dir_de = NULL; | |
197 | struct page * old_page; | |
198 | struct sysv_dir_entry * old_de; | |
199 | int err = -ENOENT; | |
200 | ||
f03b8ad8 MS |
201 | if (flags & ~RENAME_NOREPLACE) |
202 | return -EINVAL; | |
203 | ||
1da177e4 LT |
204 | old_de = sysv_find_entry(old_dentry, &old_page); |
205 | if (!old_de) | |
206 | goto out; | |
207 | ||
208 | if (S_ISDIR(old_inode->i_mode)) { | |
209 | err = -EIO; | |
210 | dir_de = sysv_dotdot(old_inode, &dir_page); | |
211 | if (!dir_de) | |
212 | goto out_old; | |
213 | } | |
214 | ||
215 | if (new_inode) { | |
216 | struct page * new_page; | |
217 | struct sysv_dir_entry * new_de; | |
218 | ||
219 | err = -ENOTEMPTY; | |
220 | if (dir_de && !sysv_empty_dir(new_inode)) | |
221 | goto out_dir; | |
222 | ||
223 | err = -ENOENT; | |
224 | new_de = sysv_find_entry(new_dentry, &new_page); | |
225 | if (!new_de) | |
226 | goto out_dir; | |
1da177e4 | 227 | sysv_set_link(new_de, new_page, old_inode); |
02027d42 | 228 | new_inode->i_ctime = current_time(new_inode); |
1da177e4 | 229 | if (dir_de) |
9a53c3a7 | 230 | drop_nlink(new_inode); |
4e907c3d | 231 | inode_dec_link_count(new_inode); |
1da177e4 | 232 | } else { |
1da177e4 | 233 | err = sysv_add_link(new_dentry, old_inode); |
4787d45f | 234 | if (err) |
1da177e4 | 235 | goto out_dir; |
1da177e4 | 236 | if (dir_de) |
4e907c3d | 237 | inode_inc_link_count(new_dir); |
1da177e4 LT |
238 | } |
239 | ||
240 | sysv_delete_entry(old_de, old_page); | |
4787d45f | 241 | mark_inode_dirty(old_inode); |
1da177e4 LT |
242 | |
243 | if (dir_de) { | |
244 | sysv_set_link(dir_de, dir_page, new_dir); | |
4e907c3d | 245 | inode_dec_link_count(old_dir); |
1da177e4 LT |
246 | } |
247 | return 0; | |
248 | ||
249 | out_dir: | |
250 | if (dir_de) { | |
251 | kunmap(dir_page); | |
09cbfeaf | 252 | put_page(dir_page); |
1da177e4 LT |
253 | } |
254 | out_old: | |
255 | kunmap(old_page); | |
09cbfeaf | 256 | put_page(old_page); |
1da177e4 LT |
257 | out: |
258 | return err; | |
259 | } | |
260 | ||
261 | /* | |
262 | * directories can handle most operations... | |
263 | */ | |
c5ef1c42 | 264 | const struct inode_operations sysv_dir_inode_operations = { |
1da177e4 LT |
265 | .create = sysv_create, |
266 | .lookup = sysv_lookup, | |
267 | .link = sysv_link, | |
268 | .unlink = sysv_unlink, | |
269 | .symlink = sysv_symlink, | |
270 | .mkdir = sysv_mkdir, | |
271 | .rmdir = sysv_rmdir, | |
272 | .mknod = sysv_mknod, | |
273 | .rename = sysv_rename, | |
274 | .getattr = sysv_getattr, | |
275 | }; |