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1 | /* |
2 | * Copyright (C) 2005, 2006 | |
27d2e149 | 3 | * Avishay Traeger (avishay@gmail.com) |
e6af00f1 BH |
4 | * Copyright (C) 2008, 2009 |
5 | * Boaz Harrosh <bharrosh@panasas.com> | |
6 | * | |
7 | * Copyrights for code taken from ext2: | |
8 | * Copyright (C) 1992, 1993, 1994, 1995 | |
9 | * Remy Card (card@masi.ibp.fr) | |
10 | * Laboratoire MASI - Institut Blaise Pascal | |
11 | * Universite Pierre et Marie Curie (Paris VI) | |
12 | * from | |
13 | * linux/fs/minix/inode.c | |
14 | * Copyright (C) 1991, 1992 Linus Torvalds | |
15 | * | |
16 | * This file is part of exofs. | |
17 | * | |
18 | * exofs is free software; you can redistribute it and/or modify | |
19 | * it under the terms of the GNU General Public License as published by | |
20 | * the Free Software Foundation. Since it is based on ext2, and the only | |
21 | * valid version of GPL for the Linux kernel is version 2, the only valid | |
22 | * version of GPL for exofs is version 2. | |
23 | * | |
24 | * exofs is distributed in the hope that it will be useful, | |
25 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
26 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
27 | * GNU General Public License for more details. | |
28 | * | |
29 | * You should have received a copy of the GNU General Public License | |
30 | * along with exofs; if not, write to the Free Software | |
31 | * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA | |
32 | */ | |
33 | ||
34 | #include "exofs.h" | |
35 | ||
36 | static inline int exofs_add_nondir(struct dentry *dentry, struct inode *inode) | |
37 | { | |
38 | int err = exofs_add_link(dentry, inode); | |
39 | if (!err) { | |
40 | d_instantiate(dentry, inode); | |
41 | return 0; | |
42 | } | |
43 | inode_dec_link_count(inode); | |
44 | iput(inode); | |
45 | return err; | |
46 | } | |
47 | ||
48 | static struct dentry *exofs_lookup(struct inode *dir, struct dentry *dentry, | |
00cd8dd3 | 49 | unsigned int flags) |
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50 | { |
51 | struct inode *inode; | |
52 | ino_t ino; | |
53 | ||
54 | if (dentry->d_name.len > EXOFS_NAME_LEN) | |
55 | return ERR_PTR(-ENAMETOOLONG); | |
56 | ||
57 | ino = exofs_inode_by_name(dir, dentry); | |
a9049376 | 58 | inode = ino ? exofs_iget(dir->i_sb, ino) : NULL; |
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59 | return d_splice_alias(inode, dentry); |
60 | } | |
61 | ||
4acdaf27 | 62 | static int exofs_create(struct inode *dir, struct dentry *dentry, umode_t mode, |
ebfc3b49 | 63 | bool excl) |
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64 | { |
65 | struct inode *inode = exofs_new_inode(dir, mode); | |
66 | int err = PTR_ERR(inode); | |
67 | if (!IS_ERR(inode)) { | |
68 | inode->i_op = &exofs_file_inode_operations; | |
69 | inode->i_fop = &exofs_file_operations; | |
70 | inode->i_mapping->a_ops = &exofs_aops; | |
71 | mark_inode_dirty(inode); | |
72 | err = exofs_add_nondir(dentry, inode); | |
73 | } | |
74 | return err; | |
75 | } | |
76 | ||
1a67aafb | 77 | static int exofs_mknod(struct inode *dir, struct dentry *dentry, umode_t mode, |
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78 | dev_t rdev) |
79 | { | |
80 | struct inode *inode; | |
81 | int err; | |
82 | ||
83 | if (!new_valid_dev(rdev)) | |
84 | return -EINVAL; | |
85 | ||
86 | inode = exofs_new_inode(dir, mode); | |
87 | err = PTR_ERR(inode); | |
88 | if (!IS_ERR(inode)) { | |
89 | init_special_inode(inode, inode->i_mode, rdev); | |
90 | mark_inode_dirty(inode); | |
91 | err = exofs_add_nondir(dentry, inode); | |
92 | } | |
93 | return err; | |
94 | } | |
95 | ||
96 | static int exofs_symlink(struct inode *dir, struct dentry *dentry, | |
97 | const char *symname) | |
98 | { | |
99 | struct super_block *sb = dir->i_sb; | |
100 | int err = -ENAMETOOLONG; | |
101 | unsigned l = strlen(symname)+1; | |
102 | struct inode *inode; | |
103 | struct exofs_i_info *oi; | |
104 | ||
105 | if (l > sb->s_blocksize) | |
106 | goto out; | |
107 | ||
108 | inode = exofs_new_inode(dir, S_IFLNK | S_IRWXUGO); | |
109 | err = PTR_ERR(inode); | |
110 | if (IS_ERR(inode)) | |
111 | goto out; | |
112 | ||
113 | oi = exofs_i(inode); | |
114 | if (l > sizeof(oi->i_data)) { | |
115 | /* slow symlink */ | |
116 | inode->i_op = &exofs_symlink_inode_operations; | |
117 | inode->i_mapping->a_ops = &exofs_aops; | |
118 | memset(oi->i_data, 0, sizeof(oi->i_data)); | |
119 | ||
120 | err = page_symlink(inode, symname, l); | |
121 | if (err) | |
122 | goto out_fail; | |
123 | } else { | |
124 | /* fast symlink */ | |
125 | inode->i_op = &exofs_fast_symlink_inode_operations; | |
126 | memcpy(oi->i_data, symname, l); | |
127 | inode->i_size = l-1; | |
128 | } | |
129 | mark_inode_dirty(inode); | |
130 | ||
131 | err = exofs_add_nondir(dentry, inode); | |
132 | out: | |
133 | return err; | |
134 | ||
135 | out_fail: | |
136 | inode_dec_link_count(inode); | |
137 | iput(inode); | |
138 | goto out; | |
139 | } | |
140 | ||
141 | static int exofs_link(struct dentry *old_dentry, struct inode *dir, | |
142 | struct dentry *dentry) | |
143 | { | |
144 | struct inode *inode = old_dentry->d_inode; | |
145 | ||
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146 | inode->i_ctime = CURRENT_TIME; |
147 | inode_inc_link_count(inode); | |
7de9c6ee | 148 | ihold(inode); |
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149 | |
150 | return exofs_add_nondir(dentry, inode); | |
151 | } | |
152 | ||
18bb1db3 | 153 | static int exofs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode) |
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154 | { |
155 | struct inode *inode; | |
8de52778 | 156 | int err; |
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157 | |
158 | inode_inc_link_count(dir); | |
159 | ||
160 | inode = exofs_new_inode(dir, S_IFDIR | mode); | |
161 | err = PTR_ERR(inode); | |
162 | if (IS_ERR(inode)) | |
163 | goto out_dir; | |
164 | ||
165 | inode->i_op = &exofs_dir_inode_operations; | |
166 | inode->i_fop = &exofs_dir_operations; | |
167 | inode->i_mapping->a_ops = &exofs_aops; | |
168 | ||
169 | inode_inc_link_count(inode); | |
170 | ||
171 | err = exofs_make_empty(inode, dir); | |
172 | if (err) | |
173 | goto out_fail; | |
174 | ||
175 | err = exofs_add_link(dentry, inode); | |
176 | if (err) | |
177 | goto out_fail; | |
178 | ||
179 | d_instantiate(dentry, inode); | |
180 | out: | |
181 | return err; | |
182 | ||
183 | out_fail: | |
184 | inode_dec_link_count(inode); | |
185 | inode_dec_link_count(inode); | |
186 | iput(inode); | |
187 | out_dir: | |
188 | inode_dec_link_count(dir); | |
189 | goto out; | |
190 | } | |
191 | ||
192 | static int exofs_unlink(struct inode *dir, struct dentry *dentry) | |
193 | { | |
194 | struct inode *inode = dentry->d_inode; | |
195 | struct exofs_dir_entry *de; | |
196 | struct page *page; | |
197 | int err = -ENOENT; | |
198 | ||
199 | de = exofs_find_entry(dir, dentry, &page); | |
200 | if (!de) | |
201 | goto out; | |
202 | ||
203 | err = exofs_delete_entry(de, page); | |
204 | if (err) | |
205 | goto out; | |
206 | ||
207 | inode->i_ctime = dir->i_ctime; | |
208 | inode_dec_link_count(inode); | |
209 | err = 0; | |
210 | out: | |
211 | return err; | |
212 | } | |
213 | ||
214 | static int exofs_rmdir(struct inode *dir, struct dentry *dentry) | |
215 | { | |
216 | struct inode *inode = dentry->d_inode; | |
217 | int err = -ENOTEMPTY; | |
218 | ||
219 | if (exofs_empty_dir(inode)) { | |
220 | err = exofs_unlink(dir, dentry); | |
221 | if (!err) { | |
222 | inode->i_size = 0; | |
223 | inode_dec_link_count(inode); | |
224 | inode_dec_link_count(dir); | |
225 | } | |
226 | } | |
227 | return err; | |
228 | } | |
229 | ||
230 | static int exofs_rename(struct inode *old_dir, struct dentry *old_dentry, | |
231 | struct inode *new_dir, struct dentry *new_dentry) | |
232 | { | |
233 | struct inode *old_inode = old_dentry->d_inode; | |
234 | struct inode *new_inode = new_dentry->d_inode; | |
235 | struct page *dir_page = NULL; | |
236 | struct exofs_dir_entry *dir_de = NULL; | |
237 | struct page *old_page; | |
238 | struct exofs_dir_entry *old_de; | |
239 | int err = -ENOENT; | |
240 | ||
241 | old_de = exofs_find_entry(old_dir, old_dentry, &old_page); | |
242 | if (!old_de) | |
243 | goto out; | |
244 | ||
245 | if (S_ISDIR(old_inode->i_mode)) { | |
246 | err = -EIO; | |
247 | dir_de = exofs_dotdot(old_inode, &dir_page); | |
248 | if (!dir_de) | |
249 | goto out_old; | |
250 | } | |
251 | ||
252 | if (new_inode) { | |
253 | struct page *new_page; | |
254 | struct exofs_dir_entry *new_de; | |
255 | ||
256 | err = -ENOTEMPTY; | |
257 | if (dir_de && !exofs_empty_dir(new_inode)) | |
258 | goto out_dir; | |
259 | ||
260 | err = -ENOENT; | |
261 | new_de = exofs_find_entry(new_dir, new_dentry, &new_page); | |
262 | if (!new_de) | |
263 | goto out_dir; | |
e6af00f1 BH |
264 | err = exofs_set_link(new_dir, new_de, new_page, old_inode); |
265 | new_inode->i_ctime = CURRENT_TIME; | |
266 | if (dir_de) | |
267 | drop_nlink(new_inode); | |
268 | inode_dec_link_count(new_inode); | |
269 | if (err) | |
270 | goto out_dir; | |
271 | } else { | |
e6af00f1 | 272 | err = exofs_add_link(new_dentry, old_inode); |
babfe560 | 273 | if (err) |
e6af00f1 | 274 | goto out_dir; |
e6af00f1 BH |
275 | if (dir_de) |
276 | inode_inc_link_count(new_dir); | |
277 | } | |
278 | ||
279 | old_inode->i_ctime = CURRENT_TIME; | |
280 | ||
281 | exofs_delete_entry(old_de, old_page); | |
babfe560 | 282 | mark_inode_dirty(old_inode); |
e6af00f1 BH |
283 | |
284 | if (dir_de) { | |
285 | err = exofs_set_link(old_inode, dir_de, dir_page, new_dir); | |
286 | inode_dec_link_count(old_dir); | |
287 | if (err) | |
288 | goto out_dir; | |
289 | } | |
290 | return 0; | |
291 | ||
292 | ||
293 | out_dir: | |
294 | if (dir_de) { | |
295 | kunmap(dir_page); | |
296 | page_cache_release(dir_page); | |
297 | } | |
298 | out_old: | |
299 | kunmap(old_page); | |
300 | page_cache_release(old_page); | |
301 | out: | |
302 | return err; | |
303 | } | |
304 | ||
305 | const struct inode_operations exofs_dir_inode_operations = { | |
306 | .create = exofs_create, | |
307 | .lookup = exofs_lookup, | |
308 | .link = exofs_link, | |
309 | .unlink = exofs_unlink, | |
310 | .symlink = exofs_symlink, | |
311 | .mkdir = exofs_mkdir, | |
312 | .rmdir = exofs_rmdir, | |
313 | .mknod = exofs_mknod, | |
314 | .rename = exofs_rename, | |
315 | .setattr = exofs_setattr, | |
316 | }; | |
317 | ||
318 | const struct inode_operations exofs_special_inode_operations = { | |
319 | .setattr = exofs_setattr, | |
320 | }; |