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1 | /* | |
2 | * linux/fs/ufs/namei.c | |
3 | * | |
4 | * Migration to usage of "page cache" on May 2006 by | |
5 | * Evgeniy Dushistov <dushistov@mail.ru> based on ext2 code base. | |
6 | * | |
7 | * Copyright (C) 1998 | |
8 | * Daniel Pirkl <daniel.pirkl@email.cz> | |
9 | * Charles University, Faculty of Mathematics and Physics | |
10 | * | |
11 | * from | |
12 | * | |
13 | * linux/fs/ext2/namei.c | |
14 | * | |
15 | * Copyright (C) 1992, 1993, 1994, 1995 | |
16 | * Remy Card (card@masi.ibp.fr) | |
17 | * Laboratoire MASI - Institut Blaise Pascal | |
18 | * Universite Pierre et Marie Curie (Paris VI) | |
19 | * | |
20 | * from | |
21 | * | |
22 | * linux/fs/minix/namei.c | |
23 | * | |
24 | * Copyright (C) 1991, 1992 Linus Torvalds | |
25 | * | |
26 | * Big-endian to little-endian byte-swapping/bitmaps by | |
27 | * David S. Miller (davem@caip.rutgers.edu), 1995 | |
28 | */ | |
29 | ||
30 | #include <linux/time.h> | |
31 | #include <linux/fs.h> | |
32 | ||
33 | #include "ufs_fs.h" | |
34 | #include "ufs.h" | |
35 | #include "util.h" | |
36 | ||
37 | static inline int ufs_add_nondir(struct dentry *dentry, struct inode *inode) | |
38 | { | |
39 | int err = ufs_add_link(dentry, inode); | |
40 | if (!err) { | |
41 | unlock_new_inode(inode); | |
42 | d_instantiate(dentry, inode); | |
43 | return 0; | |
44 | } | |
45 | inode_dec_link_count(inode); | |
46 | unlock_new_inode(inode); | |
47 | iput(inode); | |
48 | return err; | |
49 | } | |
50 | ||
51 | static struct dentry *ufs_lookup(struct inode * dir, struct dentry *dentry, unsigned int flags) | |
52 | { | |
53 | struct inode * inode = NULL; | |
54 | ino_t ino; | |
55 | ||
56 | if (dentry->d_name.len > UFS_MAXNAMLEN) | |
57 | return ERR_PTR(-ENAMETOOLONG); | |
58 | ||
59 | ino = ufs_inode_by_name(dir, &dentry->d_name); | |
60 | if (ino) | |
61 | inode = ufs_iget(dir->i_sb, ino); | |
62 | return d_splice_alias(inode, dentry); | |
63 | } | |
64 | ||
65 | /* | |
66 | * By the time this is called, we already have created | |
67 | * the directory cache entry for the new file, but it | |
68 | * is so far negative - it has no inode. | |
69 | * | |
70 | * If the create succeeds, we fill in the inode information | |
71 | * with d_instantiate(). | |
72 | */ | |
73 | static int ufs_create (struct inode * dir, struct dentry * dentry, umode_t mode, | |
74 | bool excl) | |
75 | { | |
76 | struct inode *inode; | |
77 | ||
78 | inode = ufs_new_inode(dir, mode); | |
79 | if (IS_ERR(inode)) | |
80 | return PTR_ERR(inode); | |
81 | ||
82 | inode->i_op = &ufs_file_inode_operations; | |
83 | inode->i_fop = &ufs_file_operations; | |
84 | inode->i_mapping->a_ops = &ufs_aops; | |
85 | mark_inode_dirty(inode); | |
86 | return ufs_add_nondir(dentry, inode); | |
87 | } | |
88 | ||
89 | static int ufs_mknod(struct inode *dir, struct dentry *dentry, umode_t mode, dev_t rdev) | |
90 | { | |
91 | struct inode *inode; | |
92 | int err; | |
93 | ||
94 | if (!old_valid_dev(rdev)) | |
95 | return -EINVAL; | |
96 | ||
97 | inode = ufs_new_inode(dir, mode); | |
98 | err = PTR_ERR(inode); | |
99 | if (!IS_ERR(inode)) { | |
100 | init_special_inode(inode, mode, rdev); | |
101 | ufs_set_inode_dev(inode->i_sb, UFS_I(inode), rdev); | |
102 | mark_inode_dirty(inode); | |
103 | err = ufs_add_nondir(dentry, inode); | |
104 | } | |
105 | return err; | |
106 | } | |
107 | ||
108 | static int ufs_symlink (struct inode * dir, struct dentry * dentry, | |
109 | const char * symname) | |
110 | { | |
111 | struct super_block * sb = dir->i_sb; | |
112 | int err; | |
113 | unsigned l = strlen(symname)+1; | |
114 | struct inode * inode; | |
115 | ||
116 | if (l > sb->s_blocksize) | |
117 | return -ENAMETOOLONG; | |
118 | ||
119 | inode = ufs_new_inode(dir, S_IFLNK | S_IRWXUGO); | |
120 | err = PTR_ERR(inode); | |
121 | if (IS_ERR(inode)) | |
122 | return err; | |
123 | ||
124 | if (l > UFS_SB(sb)->s_uspi->s_maxsymlinklen) { | |
125 | /* slow symlink */ | |
126 | inode->i_op = &page_symlink_inode_operations; | |
127 | inode_nohighmem(inode); | |
128 | inode->i_mapping->a_ops = &ufs_aops; | |
129 | err = page_symlink(inode, symname, l); | |
130 | if (err) | |
131 | goto out_fail; | |
132 | } else { | |
133 | /* fast symlink */ | |
134 | inode->i_op = &simple_symlink_inode_operations; | |
135 | inode->i_link = (char *)UFS_I(inode)->i_u1.i_symlink; | |
136 | memcpy(inode->i_link, symname, l); | |
137 | inode->i_size = l-1; | |
138 | } | |
139 | mark_inode_dirty(inode); | |
140 | ||
141 | return ufs_add_nondir(dentry, inode); | |
142 | ||
143 | out_fail: | |
144 | inode_dec_link_count(inode); | |
145 | unlock_new_inode(inode); | |
146 | iput(inode); | |
147 | return err; | |
148 | } | |
149 | ||
150 | static int ufs_link (struct dentry * old_dentry, struct inode * dir, | |
151 | struct dentry *dentry) | |
152 | { | |
153 | struct inode *inode = d_inode(old_dentry); | |
154 | int error; | |
155 | ||
156 | inode->i_ctime = CURRENT_TIME_SEC; | |
157 | inode_inc_link_count(inode); | |
158 | ihold(inode); | |
159 | ||
160 | error = ufs_add_link(dentry, inode); | |
161 | if (error) { | |
162 | inode_dec_link_count(inode); | |
163 | iput(inode); | |
164 | } else | |
165 | d_instantiate(dentry, inode); | |
166 | return error; | |
167 | } | |
168 | ||
169 | static int ufs_mkdir(struct inode * dir, struct dentry * dentry, umode_t mode) | |
170 | { | |
171 | struct inode * inode; | |
172 | int err; | |
173 | ||
174 | inode_inc_link_count(dir); | |
175 | ||
176 | inode = ufs_new_inode(dir, S_IFDIR|mode); | |
177 | err = PTR_ERR(inode); | |
178 | if (IS_ERR(inode)) | |
179 | goto out_dir; | |
180 | ||
181 | inode->i_op = &ufs_dir_inode_operations; | |
182 | inode->i_fop = &ufs_dir_operations; | |
183 | inode->i_mapping->a_ops = &ufs_aops; | |
184 | ||
185 | inode_inc_link_count(inode); | |
186 | ||
187 | err = ufs_make_empty(inode, dir); | |
188 | if (err) | |
189 | goto out_fail; | |
190 | ||
191 | err = ufs_add_link(dentry, inode); | |
192 | if (err) | |
193 | goto out_fail; | |
194 | ||
195 | unlock_new_inode(inode); | |
196 | d_instantiate(dentry, inode); | |
197 | return 0; | |
198 | ||
199 | out_fail: | |
200 | inode_dec_link_count(inode); | |
201 | inode_dec_link_count(inode); | |
202 | unlock_new_inode(inode); | |
203 | iput (inode); | |
204 | out_dir: | |
205 | inode_dec_link_count(dir); | |
206 | return err; | |
207 | } | |
208 | ||
209 | static int ufs_unlink(struct inode *dir, struct dentry *dentry) | |
210 | { | |
211 | struct inode * inode = d_inode(dentry); | |
212 | struct ufs_dir_entry *de; | |
213 | struct page *page; | |
214 | int err = -ENOENT; | |
215 | ||
216 | de = ufs_find_entry(dir, &dentry->d_name, &page); | |
217 | if (!de) | |
218 | goto out; | |
219 | ||
220 | err = ufs_delete_entry(dir, de, page); | |
221 | if (err) | |
222 | goto out; | |
223 | ||
224 | inode->i_ctime = dir->i_ctime; | |
225 | inode_dec_link_count(inode); | |
226 | err = 0; | |
227 | out: | |
228 | return err; | |
229 | } | |
230 | ||
231 | static int ufs_rmdir (struct inode * dir, struct dentry *dentry) | |
232 | { | |
233 | struct inode * inode = d_inode(dentry); | |
234 | int err= -ENOTEMPTY; | |
235 | ||
236 | if (ufs_empty_dir (inode)) { | |
237 | err = ufs_unlink(dir, dentry); | |
238 | if (!err) { | |
239 | inode->i_size = 0; | |
240 | inode_dec_link_count(inode); | |
241 | inode_dec_link_count(dir); | |
242 | } | |
243 | } | |
244 | return err; | |
245 | } | |
246 | ||
247 | static int ufs_rename(struct inode *old_dir, struct dentry *old_dentry, | |
248 | struct inode *new_dir, struct dentry *new_dentry, | |
249 | unsigned int flags) | |
250 | { | |
251 | struct inode *old_inode = d_inode(old_dentry); | |
252 | struct inode *new_inode = d_inode(new_dentry); | |
253 | struct page *dir_page = NULL; | |
254 | struct ufs_dir_entry * dir_de = NULL; | |
255 | struct page *old_page; | |
256 | struct ufs_dir_entry *old_de; | |
257 | int err = -ENOENT; | |
258 | ||
259 | if (flags & ~RENAME_NOREPLACE) | |
260 | return -EINVAL; | |
261 | ||
262 | old_de = ufs_find_entry(old_dir, &old_dentry->d_name, &old_page); | |
263 | if (!old_de) | |
264 | goto out; | |
265 | ||
266 | if (S_ISDIR(old_inode->i_mode)) { | |
267 | err = -EIO; | |
268 | dir_de = ufs_dotdot(old_inode, &dir_page); | |
269 | if (!dir_de) | |
270 | goto out_old; | |
271 | } | |
272 | ||
273 | if (new_inode) { | |
274 | struct page *new_page; | |
275 | struct ufs_dir_entry *new_de; | |
276 | ||
277 | err = -ENOTEMPTY; | |
278 | if (dir_de && !ufs_empty_dir(new_inode)) | |
279 | goto out_dir; | |
280 | ||
281 | err = -ENOENT; | |
282 | new_de = ufs_find_entry(new_dir, &new_dentry->d_name, &new_page); | |
283 | if (!new_de) | |
284 | goto out_dir; | |
285 | ufs_set_link(new_dir, new_de, new_page, old_inode, 1); | |
286 | new_inode->i_ctime = CURRENT_TIME_SEC; | |
287 | if (dir_de) | |
288 | drop_nlink(new_inode); | |
289 | inode_dec_link_count(new_inode); | |
290 | } else { | |
291 | err = ufs_add_link(new_dentry, old_inode); | |
292 | if (err) | |
293 | goto out_dir; | |
294 | if (dir_de) | |
295 | inode_inc_link_count(new_dir); | |
296 | } | |
297 | ||
298 | /* | |
299 | * Like most other Unix systems, set the ctime for inodes on a | |
300 | * rename. | |
301 | */ | |
302 | old_inode->i_ctime = CURRENT_TIME_SEC; | |
303 | ||
304 | ufs_delete_entry(old_dir, old_de, old_page); | |
305 | mark_inode_dirty(old_inode); | |
306 | ||
307 | if (dir_de) { | |
308 | if (old_dir != new_dir) | |
309 | ufs_set_link(old_inode, dir_de, dir_page, new_dir, 0); | |
310 | else { | |
311 | kunmap(dir_page); | |
312 | put_page(dir_page); | |
313 | } | |
314 | inode_dec_link_count(old_dir); | |
315 | } | |
316 | return 0; | |
317 | ||
318 | ||
319 | out_dir: | |
320 | if (dir_de) { | |
321 | kunmap(dir_page); | |
322 | put_page(dir_page); | |
323 | } | |
324 | out_old: | |
325 | kunmap(old_page); | |
326 | put_page(old_page); | |
327 | out: | |
328 | return err; | |
329 | } | |
330 | ||
331 | const struct inode_operations ufs_dir_inode_operations = { | |
332 | .create = ufs_create, | |
333 | .lookup = ufs_lookup, | |
334 | .link = ufs_link, | |
335 | .unlink = ufs_unlink, | |
336 | .symlink = ufs_symlink, | |
337 | .mkdir = ufs_mkdir, | |
338 | .rmdir = ufs_rmdir, | |
339 | .mknod = ufs_mknod, | |
340 | .rename2 = ufs_rename, | |
341 | }; |