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b2441318 | 1 | // SPDX-License-Identifier: GPL-2.0 |
1da177e4 LT |
2 | /* |
3 | * linux/fs/ufs/namei.c | |
4 | * | |
b71034e5 ED |
5 | * Migration to usage of "page cache" on May 2006 by |
6 | * Evgeniy Dushistov <dushistov@mail.ru> based on ext2 code base. | |
7 | * | |
1da177e4 LT |
8 | * Copyright (C) 1998 |
9 | * Daniel Pirkl <daniel.pirkl@email.cz> | |
10 | * Charles University, Faculty of Mathematics and Physics | |
11 | * | |
12 | * from | |
13 | * | |
14 | * linux/fs/ext2/namei.c | |
15 | * | |
16 | * Copyright (C) 1992, 1993, 1994, 1995 | |
17 | * Remy Card (card@masi.ibp.fr) | |
18 | * Laboratoire MASI - Institut Blaise Pascal | |
19 | * Universite Pierre et Marie Curie (Paris VI) | |
20 | * | |
21 | * from | |
22 | * | |
23 | * linux/fs/minix/namei.c | |
24 | * | |
25 | * Copyright (C) 1991, 1992 Linus Torvalds | |
26 | * | |
27 | * Big-endian to little-endian byte-swapping/bitmaps by | |
28 | * David S. Miller (davem@caip.rutgers.edu), 1995 | |
29 | */ | |
30 | ||
31 | #include <linux/time.h> | |
32 | #include <linux/fs.h> | |
e5420598 MF |
33 | |
34 | #include "ufs_fs.h" | |
bcd6d4ec | 35 | #include "ufs.h" |
1da177e4 LT |
36 | #include "util.h" |
37 | ||
1da177e4 LT |
38 | static inline int ufs_add_nondir(struct dentry *dentry, struct inode *inode) |
39 | { | |
40 | int err = ufs_add_link(dentry, inode); | |
41 | if (!err) { | |
1e2e547a | 42 | d_instantiate_new(dentry, inode); |
1da177e4 LT |
43 | return 0; |
44 | } | |
3257545e | 45 | inode_dec_link_count(inode); |
dd549927 | 46 | discard_new_inode(inode); |
1da177e4 LT |
47 | return err; |
48 | } | |
49 | ||
00cd8dd3 | 50 | static struct dentry *ufs_lookup(struct inode * dir, struct dentry *dentry, unsigned int flags) |
1da177e4 LT |
51 | { |
52 | struct inode * inode = NULL; | |
53 | ino_t ino; | |
54 | ||
55 | if (dentry->d_name.len > UFS_MAXNAMLEN) | |
56 | return ERR_PTR(-ENAMETOOLONG); | |
57 | ||
08049707 | 58 | ino = ufs_inode_by_name(dir, &dentry->d_name); |
642c937b | 59 | if (ino) |
b55c460d | 60 | inode = ufs_iget(dir->i_sb, ino); |
642c937b | 61 | return d_splice_alias(inode, dentry); |
1da177e4 LT |
62 | } |
63 | ||
64 | /* | |
65 | * By the time this is called, we already have created | |
66 | * the directory cache entry for the new file, but it | |
67 | * is so far negative - it has no inode. | |
68 | * | |
69 | * If the create succeeds, we fill in the inode information | |
70 | * with d_instantiate(). | |
71 | */ | |
4acdaf27 | 72 | static int ufs_create (struct inode * dir, struct dentry * dentry, umode_t mode, |
ebfc3b49 | 73 | bool excl) |
1da177e4 | 74 | { |
abf5d15f | 75 | struct inode *inode; |
907f4554 | 76 | |
abf5d15f | 77 | inode = ufs_new_inode(dir, mode); |
a50e4a02 AV |
78 | if (IS_ERR(inode)) |
79 | return PTR_ERR(inode); | |
abf5d15f | 80 | |
a50e4a02 AV |
81 | inode->i_op = &ufs_file_inode_operations; |
82 | inode->i_fop = &ufs_file_operations; | |
83 | inode->i_mapping->a_ops = &ufs_aops; | |
84 | mark_inode_dirty(inode); | |
85 | return ufs_add_nondir(dentry, inode); | |
1da177e4 LT |
86 | } |
87 | ||
1a67aafb | 88 | static int ufs_mknod(struct inode *dir, struct dentry *dentry, umode_t mode, dev_t rdev) |
1da177e4 LT |
89 | { |
90 | struct inode *inode; | |
91 | int err; | |
92 | ||
93 | if (!old_valid_dev(rdev)) | |
94 | return -EINVAL; | |
907f4554 | 95 | |
1da177e4 LT |
96 | inode = ufs_new_inode(dir, mode); |
97 | err = PTR_ERR(inode); | |
98 | if (!IS_ERR(inode)) { | |
99 | init_special_inode(inode, mode, rdev); | |
1da177e4 LT |
100 | ufs_set_inode_dev(inode->i_sb, UFS_I(inode), rdev); |
101 | mark_inode_dirty(inode); | |
1da177e4 | 102 | err = ufs_add_nondir(dentry, inode); |
1da177e4 LT |
103 | } |
104 | return err; | |
105 | } | |
106 | ||
107 | static int ufs_symlink (struct inode * dir, struct dentry * dentry, | |
108 | const char * symname) | |
109 | { | |
110 | struct super_block * sb = dir->i_sb; | |
a50e4a02 | 111 | int err; |
1da177e4 LT |
112 | unsigned l = strlen(symname)+1; |
113 | struct inode * inode; | |
114 | ||
115 | if (l > sb->s_blocksize) | |
a50e4a02 | 116 | return -ENAMETOOLONG; |
1da177e4 | 117 | |
1da177e4 LT |
118 | inode = ufs_new_inode(dir, S_IFLNK | S_IRWXUGO); |
119 | err = PTR_ERR(inode); | |
120 | if (IS_ERR(inode)) | |
a50e4a02 | 121 | return err; |
1da177e4 LT |
122 | |
123 | if (l > UFS_SB(sb)->s_uspi->s_maxsymlinklen) { | |
124 | /* slow symlink */ | |
9cdce3c0 | 125 | inode->i_op = &page_symlink_inode_operations; |
21fc61c7 | 126 | inode_nohighmem(inode); |
1da177e4 LT |
127 | inode->i_mapping->a_ops = &ufs_aops; |
128 | err = page_symlink(inode, symname, l); | |
129 | if (err) | |
130 | goto out_fail; | |
131 | } else { | |
132 | /* fast symlink */ | |
9cdce3c0 | 133 | inode->i_op = &simple_symlink_inode_operations; |
4b8061a6 AV |
134 | inode->i_link = (char *)UFS_I(inode)->i_u1.i_symlink; |
135 | memcpy(inode->i_link, symname, l); | |
1da177e4 LT |
136 | inode->i_size = l-1; |
137 | } | |
138 | mark_inode_dirty(inode); | |
139 | ||
a50e4a02 | 140 | return ufs_add_nondir(dentry, inode); |
1da177e4 LT |
141 | |
142 | out_fail: | |
3257545e | 143 | inode_dec_link_count(inode); |
dd549927 | 144 | discard_new_inode(inode); |
a50e4a02 | 145 | return err; |
1da177e4 LT |
146 | } |
147 | ||
148 | static int ufs_link (struct dentry * old_dentry, struct inode * dir, | |
149 | struct dentry *dentry) | |
150 | { | |
2b0143b5 | 151 | struct inode *inode = d_inode(old_dentry); |
1da177e4 LT |
152 | int error; |
153 | ||
02027d42 | 154 | inode->i_ctime = current_time(inode); |
3257545e | 155 | inode_inc_link_count(inode); |
7de9c6ee | 156 | ihold(inode); |
1da177e4 | 157 | |
12ecbb4b JK |
158 | error = ufs_add_link(dentry, inode); |
159 | if (error) { | |
160 | inode_dec_link_count(inode); | |
161 | iput(inode); | |
162 | } else | |
163 | d_instantiate(dentry, inode); | |
1da177e4 LT |
164 | return error; |
165 | } | |
166 | ||
18bb1db3 | 167 | static int ufs_mkdir(struct inode * dir, struct dentry * dentry, umode_t mode) |
1da177e4 LT |
168 | { |
169 | struct inode * inode; | |
8de52778 | 170 | int err; |
1da177e4 | 171 | |
13b987ea FF |
172 | inode_inc_link_count(dir); |
173 | ||
1da177e4 | 174 | inode = ufs_new_inode(dir, S_IFDIR|mode); |
13b987ea | 175 | err = PTR_ERR(inode); |
1da177e4 | 176 | if (IS_ERR(inode)) |
13b987ea | 177 | goto out_dir; |
1da177e4 LT |
178 | |
179 | inode->i_op = &ufs_dir_inode_operations; | |
180 | inode->i_fop = &ufs_dir_operations; | |
826843a3 | 181 | inode->i_mapping->a_ops = &ufs_aops; |
1da177e4 | 182 | |
3257545e | 183 | inode_inc_link_count(inode); |
1da177e4 LT |
184 | |
185 | err = ufs_make_empty(inode, dir); | |
186 | if (err) | |
187 | goto out_fail; | |
188 | ||
189 | err = ufs_add_link(dentry, inode); | |
190 | if (err) | |
191 | goto out_fail; | |
1da177e4 | 192 | |
1e2e547a | 193 | d_instantiate_new(dentry, inode); |
a50e4a02 | 194 | return 0; |
1da177e4 LT |
195 | |
196 | out_fail: | |
3257545e AD |
197 | inode_dec_link_count(inode); |
198 | inode_dec_link_count(inode); | |
dd549927 | 199 | discard_new_inode(inode); |
13b987ea | 200 | out_dir: |
3257545e | 201 | inode_dec_link_count(dir); |
a50e4a02 | 202 | return err; |
1da177e4 LT |
203 | } |
204 | ||
b71034e5 | 205 | static int ufs_unlink(struct inode *dir, struct dentry *dentry) |
1da177e4 | 206 | { |
2b0143b5 | 207 | struct inode * inode = d_inode(dentry); |
b71034e5 ED |
208 | struct ufs_dir_entry *de; |
209 | struct page *page; | |
1da177e4 LT |
210 | int err = -ENOENT; |
211 | ||
08049707 | 212 | de = ufs_find_entry(dir, &dentry->d_name, &page); |
1da177e4 LT |
213 | if (!de) |
214 | goto out; | |
215 | ||
b71034e5 | 216 | err = ufs_delete_entry(dir, de, page); |
1da177e4 LT |
217 | if (err) |
218 | goto out; | |
219 | ||
220 | inode->i_ctime = dir->i_ctime; | |
3257545e | 221 | inode_dec_link_count(inode); |
1da177e4 LT |
222 | err = 0; |
223 | out: | |
1da177e4 LT |
224 | return err; |
225 | } | |
226 | ||
227 | static int ufs_rmdir (struct inode * dir, struct dentry *dentry) | |
228 | { | |
2b0143b5 | 229 | struct inode * inode = d_inode(dentry); |
1da177e4 LT |
230 | int err= -ENOTEMPTY; |
231 | ||
1da177e4 LT |
232 | if (ufs_empty_dir (inode)) { |
233 | err = ufs_unlink(dir, dentry); | |
234 | if (!err) { | |
235 | inode->i_size = 0; | |
3257545e AD |
236 | inode_dec_link_count(inode); |
237 | inode_dec_link_count(dir); | |
1da177e4 LT |
238 | } |
239 | } | |
1da177e4 LT |
240 | return err; |
241 | } | |
242 | ||
b71034e5 | 243 | static int ufs_rename(struct inode *old_dir, struct dentry *old_dentry, |
f03b8ad8 MS |
244 | struct inode *new_dir, struct dentry *new_dentry, |
245 | unsigned int flags) | |
1da177e4 | 246 | { |
2b0143b5 DH |
247 | struct inode *old_inode = d_inode(old_dentry); |
248 | struct inode *new_inode = d_inode(new_dentry); | |
b71034e5 ED |
249 | struct page *dir_page = NULL; |
250 | struct ufs_dir_entry * dir_de = NULL; | |
251 | struct page *old_page; | |
1da177e4 LT |
252 | struct ufs_dir_entry *old_de; |
253 | int err = -ENOENT; | |
254 | ||
f03b8ad8 MS |
255 | if (flags & ~RENAME_NOREPLACE) |
256 | return -EINVAL; | |
257 | ||
08049707 | 258 | old_de = ufs_find_entry(old_dir, &old_dentry->d_name, &old_page); |
1da177e4 LT |
259 | if (!old_de) |
260 | goto out; | |
261 | ||
262 | if (S_ISDIR(old_inode->i_mode)) { | |
263 | err = -EIO; | |
b71034e5 | 264 | dir_de = ufs_dotdot(old_inode, &dir_page); |
1da177e4 LT |
265 | if (!dir_de) |
266 | goto out_old; | |
267 | } | |
268 | ||
269 | if (new_inode) { | |
b71034e5 | 270 | struct page *new_page; |
1da177e4 LT |
271 | struct ufs_dir_entry *new_de; |
272 | ||
273 | err = -ENOTEMPTY; | |
b71034e5 | 274 | if (dir_de && !ufs_empty_dir(new_inode)) |
1da177e4 | 275 | goto out_dir; |
b71034e5 | 276 | |
1da177e4 | 277 | err = -ENOENT; |
08049707 | 278 | new_de = ufs_find_entry(new_dir, &new_dentry->d_name, &new_page); |
1da177e4 LT |
279 | if (!new_de) |
280 | goto out_dir; | |
70d45cdb | 281 | ufs_set_link(new_dir, new_de, new_page, old_inode, 1); |
02027d42 | 282 | new_inode->i_ctime = current_time(new_inode); |
1da177e4 | 283 | if (dir_de) |
9a53c3a7 | 284 | drop_nlink(new_inode); |
3257545e | 285 | inode_dec_link_count(new_inode); |
1da177e4 | 286 | } else { |
1da177e4 | 287 | err = ufs_add_link(new_dentry, old_inode); |
37750cdd | 288 | if (err) |
1da177e4 | 289 | goto out_dir; |
1da177e4 | 290 | if (dir_de) |
3257545e | 291 | inode_inc_link_count(new_dir); |
1da177e4 LT |
292 | } |
293 | ||
b71034e5 ED |
294 | /* |
295 | * Like most other Unix systems, set the ctime for inodes on a | |
296 | * rename. | |
b71034e5 | 297 | */ |
02027d42 | 298 | old_inode->i_ctime = current_time(old_inode); |
1da177e4 | 299 | |
b71034e5 | 300 | ufs_delete_entry(old_dir, old_de, old_page); |
37750cdd | 301 | mark_inode_dirty(old_inode); |
1da177e4 LT |
302 | |
303 | if (dir_de) { | |
70d45cdb AV |
304 | if (old_dir != new_dir) |
305 | ufs_set_link(old_inode, dir_de, dir_page, new_dir, 0); | |
306 | else { | |
307 | kunmap(dir_page); | |
09cbfeaf | 308 | put_page(dir_page); |
70d45cdb | 309 | } |
3257545e | 310 | inode_dec_link_count(old_dir); |
1da177e4 | 311 | } |
1da177e4 LT |
312 | return 0; |
313 | ||
b71034e5 | 314 | |
1da177e4 | 315 | out_dir: |
b71034e5 ED |
316 | if (dir_de) { |
317 | kunmap(dir_page); | |
09cbfeaf | 318 | put_page(dir_page); |
b71034e5 | 319 | } |
1da177e4 | 320 | out_old: |
b71034e5 | 321 | kunmap(old_page); |
09cbfeaf | 322 | put_page(old_page); |
1da177e4 | 323 | out: |
1da177e4 LT |
324 | return err; |
325 | } | |
326 | ||
c5ef1c42 | 327 | const struct inode_operations ufs_dir_inode_operations = { |
1da177e4 LT |
328 | .create = ufs_create, |
329 | .lookup = ufs_lookup, | |
330 | .link = ufs_link, | |
331 | .unlink = ufs_unlink, | |
332 | .symlink = ufs_symlink, | |
333 | .mkdir = ufs_mkdir, | |
334 | .rmdir = ufs_rmdir, | |
335 | .mknod = ufs_mknod, | |
336 | .rename = ufs_rename, | |
337 | }; |