Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * linux/fs/bad_inode.c | |
3 | * | |
4 | * Copyright (C) 1997, Stephen Tweedie | |
5 | * | |
6 | * Provide stub functions for unreadable inodes | |
7 | * | |
8 | * Fabian Frederick : August 2003 - All file operations assigned to EIO | |
9 | */ | |
10 | ||
11 | #include <linux/fs.h> | |
12 | #include <linux/module.h> | |
13 | #include <linux/stat.h> | |
14 | #include <linux/time.h> | |
1da177e4 | 15 | #include <linux/namei.h> |
be6aab0e | 16 | #include <linux/poll.h> |
1da177e4 | 17 | |
be6aab0e ES |
18 | |
19 | static loff_t bad_file_llseek(struct file *file, loff_t offset, int origin) | |
20 | { | |
21 | return -EIO; | |
22 | } | |
23 | ||
24 | static ssize_t bad_file_read(struct file *filp, char __user *buf, | |
25 | size_t size, loff_t *ppos) | |
26 | { | |
27 | return -EIO; | |
28 | } | |
29 | ||
30 | static ssize_t bad_file_write(struct file *filp, const char __user *buf, | |
31 | size_t siz, loff_t *ppos) | |
32 | { | |
33 | return -EIO; | |
34 | } | |
35 | ||
36 | static ssize_t bad_file_aio_read(struct kiocb *iocb, const struct iovec *iov, | |
37 | unsigned long nr_segs, loff_t pos) | |
38 | { | |
39 | return -EIO; | |
40 | } | |
41 | ||
42 | static ssize_t bad_file_aio_write(struct kiocb *iocb, const struct iovec *iov, | |
43 | unsigned long nr_segs, loff_t pos) | |
44 | { | |
45 | return -EIO; | |
46 | } | |
47 | ||
48 | static int bad_file_readdir(struct file *filp, void *dirent, filldir_t filldir) | |
49 | { | |
50 | return -EIO; | |
51 | } | |
52 | ||
53 | static unsigned int bad_file_poll(struct file *filp, poll_table *wait) | |
54 | { | |
55 | return POLLERR; | |
56 | } | |
57 | ||
58 | static int bad_file_ioctl (struct inode *inode, struct file *filp, | |
59 | unsigned int cmd, unsigned long arg) | |
60 | { | |
61 | return -EIO; | |
62 | } | |
63 | ||
64 | static long bad_file_unlocked_ioctl(struct file *file, unsigned cmd, | |
65 | unsigned long arg) | |
66 | { | |
67 | return -EIO; | |
68 | } | |
69 | ||
70 | static long bad_file_compat_ioctl(struct file *file, unsigned int cmd, | |
71 | unsigned long arg) | |
72 | { | |
73 | return -EIO; | |
74 | } | |
75 | ||
76 | static int bad_file_mmap(struct file *file, struct vm_area_struct *vma) | |
77 | { | |
78 | return -EIO; | |
79 | } | |
80 | ||
81 | static int bad_file_open(struct inode *inode, struct file *filp) | |
82 | { | |
83 | return -EIO; | |
84 | } | |
85 | ||
86 | static int bad_file_flush(struct file *file, fl_owner_t id) | |
87 | { | |
88 | return -EIO; | |
89 | } | |
90 | ||
91 | static int bad_file_release(struct inode *inode, struct file *filp) | |
92 | { | |
93 | return -EIO; | |
94 | } | |
95 | ||
96 | static int bad_file_fsync(struct file *file, struct dentry *dentry, | |
97 | int datasync) | |
98 | { | |
99 | return -EIO; | |
100 | } | |
101 | ||
102 | static int bad_file_aio_fsync(struct kiocb *iocb, int datasync) | |
103 | { | |
104 | return -EIO; | |
105 | } | |
106 | ||
107 | static int bad_file_fasync(int fd, struct file *filp, int on) | |
108 | { | |
109 | return -EIO; | |
110 | } | |
111 | ||
112 | static int bad_file_lock(struct file *file, int cmd, struct file_lock *fl) | |
113 | { | |
114 | return -EIO; | |
115 | } | |
116 | ||
117 | static ssize_t bad_file_sendfile(struct file *in_file, loff_t *ppos, | |
118 | size_t count, read_actor_t actor, void *target) | |
119 | { | |
120 | return -EIO; | |
121 | } | |
122 | ||
123 | static ssize_t bad_file_sendpage(struct file *file, struct page *page, | |
124 | int off, size_t len, loff_t *pos, int more) | |
125 | { | |
126 | return -EIO; | |
127 | } | |
128 | ||
129 | static unsigned long bad_file_get_unmapped_area(struct file *file, | |
130 | unsigned long addr, unsigned long len, | |
131 | unsigned long pgoff, unsigned long flags) | |
132 | { | |
133 | return -EIO; | |
134 | } | |
135 | ||
136 | static int bad_file_check_flags(int flags) | |
1da177e4 LT |
137 | { |
138 | return -EIO; | |
139 | } | |
140 | ||
be6aab0e ES |
141 | static int bad_file_dir_notify(struct file *file, unsigned long arg) |
142 | { | |
143 | return -EIO; | |
144 | } | |
145 | ||
146 | static int bad_file_flock(struct file *filp, int cmd, struct file_lock *fl) | |
147 | { | |
148 | return -EIO; | |
149 | } | |
150 | ||
151 | static ssize_t bad_file_splice_write(struct pipe_inode_info *pipe, | |
152 | struct file *out, loff_t *ppos, size_t len, | |
153 | unsigned int flags) | |
154 | { | |
155 | return -EIO; | |
156 | } | |
157 | ||
158 | static ssize_t bad_file_splice_read(struct file *in, loff_t *ppos, | |
159 | struct pipe_inode_info *pipe, size_t len, | |
160 | unsigned int flags) | |
161 | { | |
162 | return -EIO; | |
163 | } | |
1da177e4 | 164 | |
4b6f5d20 | 165 | static const struct file_operations bad_file_ops = |
1da177e4 | 166 | { |
be6aab0e ES |
167 | .llseek = bad_file_llseek, |
168 | .read = bad_file_read, | |
169 | .write = bad_file_write, | |
170 | .aio_read = bad_file_aio_read, | |
171 | .aio_write = bad_file_aio_write, | |
172 | .readdir = bad_file_readdir, | |
173 | .poll = bad_file_poll, | |
174 | .ioctl = bad_file_ioctl, | |
175 | .unlocked_ioctl = bad_file_unlocked_ioctl, | |
176 | .compat_ioctl = bad_file_compat_ioctl, | |
177 | .mmap = bad_file_mmap, | |
178 | .open = bad_file_open, | |
179 | .flush = bad_file_flush, | |
180 | .release = bad_file_release, | |
181 | .fsync = bad_file_fsync, | |
182 | .aio_fsync = bad_file_aio_fsync, | |
183 | .fasync = bad_file_fasync, | |
184 | .lock = bad_file_lock, | |
185 | .sendfile = bad_file_sendfile, | |
186 | .sendpage = bad_file_sendpage, | |
187 | .get_unmapped_area = bad_file_get_unmapped_area, | |
188 | .check_flags = bad_file_check_flags, | |
189 | .dir_notify = bad_file_dir_notify, | |
190 | .flock = bad_file_flock, | |
191 | .splice_write = bad_file_splice_write, | |
192 | .splice_read = bad_file_splice_read, | |
1da177e4 LT |
193 | }; |
194 | ||
be6aab0e ES |
195 | static int bad_inode_create (struct inode *dir, struct dentry *dentry, |
196 | int mode, struct nameidata *nd) | |
197 | { | |
198 | return -EIO; | |
199 | } | |
200 | ||
201 | static struct dentry *bad_inode_lookup(struct inode *dir, | |
202 | struct dentry *dentry, struct nameidata *nd) | |
203 | { | |
204 | return ERR_PTR(-EIO); | |
205 | } | |
206 | ||
207 | static int bad_inode_link (struct dentry *old_dentry, struct inode *dir, | |
208 | struct dentry *dentry) | |
209 | { | |
210 | return -EIO; | |
211 | } | |
212 | ||
213 | static int bad_inode_unlink(struct inode *dir, struct dentry *dentry) | |
214 | { | |
215 | return -EIO; | |
216 | } | |
217 | ||
218 | static int bad_inode_symlink (struct inode *dir, struct dentry *dentry, | |
219 | const char *symname) | |
220 | { | |
221 | return -EIO; | |
222 | } | |
223 | ||
224 | static int bad_inode_mkdir(struct inode *dir, struct dentry *dentry, | |
225 | int mode) | |
226 | { | |
227 | return -EIO; | |
228 | } | |
229 | ||
230 | static int bad_inode_rmdir (struct inode *dir, struct dentry *dentry) | |
231 | { | |
232 | return -EIO; | |
233 | } | |
234 | ||
235 | static int bad_inode_mknod (struct inode *dir, struct dentry *dentry, | |
236 | int mode, dev_t rdev) | |
237 | { | |
238 | return -EIO; | |
239 | } | |
240 | ||
241 | static int bad_inode_rename (struct inode *old_dir, struct dentry *old_dentry, | |
242 | struct inode *new_dir, struct dentry *new_dentry) | |
243 | { | |
244 | return -EIO; | |
245 | } | |
246 | ||
247 | static int bad_inode_readlink(struct dentry *dentry, char __user *buffer, | |
248 | int buflen) | |
249 | { | |
250 | return -EIO; | |
251 | } | |
252 | ||
253 | static int bad_inode_permission(struct inode *inode, int mask, | |
254 | struct nameidata *nd) | |
255 | { | |
256 | return -EIO; | |
257 | } | |
258 | ||
259 | static int bad_inode_getattr(struct vfsmount *mnt, struct dentry *dentry, | |
260 | struct kstat *stat) | |
261 | { | |
262 | return -EIO; | |
263 | } | |
264 | ||
265 | static int bad_inode_setattr(struct dentry *direntry, struct iattr *attrs) | |
266 | { | |
267 | return -EIO; | |
268 | } | |
269 | ||
270 | static int bad_inode_setxattr(struct dentry *dentry, const char *name, | |
271 | const void *value, size_t size, int flags) | |
272 | { | |
273 | return -EIO; | |
274 | } | |
275 | ||
276 | static ssize_t bad_inode_getxattr(struct dentry *dentry, const char *name, | |
277 | void *buffer, size_t size) | |
278 | { | |
279 | return -EIO; | |
280 | } | |
281 | ||
282 | static ssize_t bad_inode_listxattr(struct dentry *dentry, char *buffer, | |
283 | size_t buffer_size) | |
284 | { | |
285 | return -EIO; | |
286 | } | |
287 | ||
288 | static int bad_inode_removexattr(struct dentry *dentry, const char *name) | |
289 | { | |
290 | return -EIO; | |
291 | } | |
292 | ||
754661f1 | 293 | static const struct inode_operations bad_inode_ops = |
1da177e4 | 294 | { |
be6aab0e ES |
295 | .create = bad_inode_create, |
296 | .lookup = bad_inode_lookup, | |
297 | .link = bad_inode_link, | |
298 | .unlink = bad_inode_unlink, | |
299 | .symlink = bad_inode_symlink, | |
300 | .mkdir = bad_inode_mkdir, | |
301 | .rmdir = bad_inode_rmdir, | |
302 | .mknod = bad_inode_mknod, | |
303 | .rename = bad_inode_rename, | |
304 | .readlink = bad_inode_readlink, | |
1da177e4 LT |
305 | /* follow_link must be no-op, otherwise unmounting this inode |
306 | won't work */ | |
be6aab0e ES |
307 | /* put_link returns void */ |
308 | /* truncate returns void */ | |
309 | .permission = bad_inode_permission, | |
310 | .getattr = bad_inode_getattr, | |
311 | .setattr = bad_inode_setattr, | |
312 | .setxattr = bad_inode_setxattr, | |
313 | .getxattr = bad_inode_getxattr, | |
314 | .listxattr = bad_inode_listxattr, | |
315 | .removexattr = bad_inode_removexattr, | |
316 | /* truncate_range returns void */ | |
1da177e4 LT |
317 | }; |
318 | ||
319 | ||
320 | /* | |
321 | * When a filesystem is unable to read an inode due to an I/O error in | |
322 | * its read_inode() function, it can call make_bad_inode() to return a | |
323 | * set of stubs which will return EIO errors as required. | |
324 | * | |
325 | * We only need to do limited initialisation: all other fields are | |
326 | * preinitialised to zero automatically. | |
327 | */ | |
328 | ||
329 | /** | |
330 | * make_bad_inode - mark an inode bad due to an I/O error | |
331 | * @inode: Inode to mark bad | |
332 | * | |
333 | * When an inode cannot be read due to a media or remote network | |
334 | * failure this function makes the inode "bad" and causes I/O operations | |
335 | * on it to fail from this point on. | |
336 | */ | |
337 | ||
be6aab0e | 338 | void make_bad_inode(struct inode *inode) |
1da177e4 LT |
339 | { |
340 | remove_inode_hash(inode); | |
341 | ||
342 | inode->i_mode = S_IFREG; | |
343 | inode->i_atime = inode->i_mtime = inode->i_ctime = | |
344 | current_fs_time(inode->i_sb); | |
345 | inode->i_op = &bad_inode_ops; | |
346 | inode->i_fop = &bad_file_ops; | |
347 | } | |
348 | EXPORT_SYMBOL(make_bad_inode); | |
349 | ||
350 | /* | |
351 | * This tests whether an inode has been flagged as bad. The test uses | |
352 | * &bad_inode_ops to cover the case of invalidated inodes as well as | |
353 | * those created by make_bad_inode() above. | |
354 | */ | |
355 | ||
356 | /** | |
357 | * is_bad_inode - is an inode errored | |
358 | * @inode: inode to test | |
359 | * | |
360 | * Returns true if the inode in question has been marked as bad. | |
361 | */ | |
362 | ||
be6aab0e | 363 | int is_bad_inode(struct inode *inode) |
1da177e4 LT |
364 | { |
365 | return (inode->i_op == &bad_inode_ops); | |
366 | } | |
367 | ||
368 | EXPORT_SYMBOL(is_bad_inode); |