Commit | Line | Data |
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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> | |
15 | #include <linux/smp_lock.h> | |
16 | #include <linux/namei.h> | |
be6aab0e | 17 | #include <linux/poll.h> |
1da177e4 | 18 | |
be6aab0e ES |
19 | |
20 | static loff_t bad_file_llseek(struct file *file, loff_t offset, int origin) | |
21 | { | |
22 | return -EIO; | |
23 | } | |
24 | ||
25 | static ssize_t bad_file_read(struct file *filp, char __user *buf, | |
26 | size_t size, loff_t *ppos) | |
27 | { | |
28 | return -EIO; | |
29 | } | |
30 | ||
31 | static ssize_t bad_file_write(struct file *filp, const char __user *buf, | |
32 | size_t siz, loff_t *ppos) | |
33 | { | |
34 | return -EIO; | |
35 | } | |
36 | ||
37 | static ssize_t bad_file_aio_read(struct kiocb *iocb, const struct iovec *iov, | |
38 | unsigned long nr_segs, loff_t pos) | |
39 | { | |
40 | return -EIO; | |
41 | } | |
42 | ||
43 | static ssize_t bad_file_aio_write(struct kiocb *iocb, const struct iovec *iov, | |
44 | unsigned long nr_segs, loff_t pos) | |
45 | { | |
46 | return -EIO; | |
47 | } | |
48 | ||
49 | static int bad_file_readdir(struct file *filp, void *dirent, filldir_t filldir) | |
50 | { | |
51 | return -EIO; | |
52 | } | |
53 | ||
54 | static unsigned int bad_file_poll(struct file *filp, poll_table *wait) | |
55 | { | |
56 | return POLLERR; | |
57 | } | |
58 | ||
59 | static int bad_file_ioctl (struct inode *inode, struct file *filp, | |
60 | unsigned int cmd, unsigned long arg) | |
61 | { | |
62 | return -EIO; | |
63 | } | |
64 | ||
65 | static long bad_file_unlocked_ioctl(struct file *file, unsigned cmd, | |
66 | unsigned long arg) | |
67 | { | |
68 | return -EIO; | |
69 | } | |
70 | ||
71 | static long bad_file_compat_ioctl(struct file *file, unsigned int cmd, | |
72 | unsigned long arg) | |
73 | { | |
74 | return -EIO; | |
75 | } | |
76 | ||
77 | static int bad_file_mmap(struct file *file, struct vm_area_struct *vma) | |
78 | { | |
79 | return -EIO; | |
80 | } | |
81 | ||
82 | static int bad_file_open(struct inode *inode, struct file *filp) | |
83 | { | |
84 | return -EIO; | |
85 | } | |
86 | ||
87 | static int bad_file_flush(struct file *file, fl_owner_t id) | |
88 | { | |
89 | return -EIO; | |
90 | } | |
91 | ||
92 | static int bad_file_release(struct inode *inode, struct file *filp) | |
93 | { | |
94 | return -EIO; | |
95 | } | |
96 | ||
97 | static int bad_file_fsync(struct file *file, struct dentry *dentry, | |
98 | int datasync) | |
99 | { | |
100 | return -EIO; | |
101 | } | |
102 | ||
103 | static int bad_file_aio_fsync(struct kiocb *iocb, int datasync) | |
104 | { | |
105 | return -EIO; | |
106 | } | |
107 | ||
108 | static int bad_file_fasync(int fd, struct file *filp, int on) | |
109 | { | |
110 | return -EIO; | |
111 | } | |
112 | ||
113 | static int bad_file_lock(struct file *file, int cmd, struct file_lock *fl) | |
114 | { | |
115 | return -EIO; | |
116 | } | |
117 | ||
118 | static ssize_t bad_file_sendfile(struct file *in_file, loff_t *ppos, | |
119 | size_t count, read_actor_t actor, void *target) | |
120 | { | |
121 | return -EIO; | |
122 | } | |
123 | ||
124 | static ssize_t bad_file_sendpage(struct file *file, struct page *page, | |
125 | int off, size_t len, loff_t *pos, int more) | |
126 | { | |
127 | return -EIO; | |
128 | } | |
129 | ||
130 | static unsigned long bad_file_get_unmapped_area(struct file *file, | |
131 | unsigned long addr, unsigned long len, | |
132 | unsigned long pgoff, unsigned long flags) | |
133 | { | |
134 | return -EIO; | |
135 | } | |
136 | ||
137 | static int bad_file_check_flags(int flags) | |
1da177e4 LT |
138 | { |
139 | return -EIO; | |
140 | } | |
141 | ||
be6aab0e ES |
142 | static int bad_file_dir_notify(struct file *file, unsigned long arg) |
143 | { | |
144 | return -EIO; | |
145 | } | |
146 | ||
147 | static int bad_file_flock(struct file *filp, int cmd, struct file_lock *fl) | |
148 | { | |
149 | return -EIO; | |
150 | } | |
151 | ||
152 | static ssize_t bad_file_splice_write(struct pipe_inode_info *pipe, | |
153 | struct file *out, loff_t *ppos, size_t len, | |
154 | unsigned int flags) | |
155 | { | |
156 | return -EIO; | |
157 | } | |
158 | ||
159 | static ssize_t bad_file_splice_read(struct file *in, loff_t *ppos, | |
160 | struct pipe_inode_info *pipe, size_t len, | |
161 | unsigned int flags) | |
162 | { | |
163 | return -EIO; | |
164 | } | |
1da177e4 | 165 | |
4b6f5d20 | 166 | static const struct file_operations bad_file_ops = |
1da177e4 | 167 | { |
be6aab0e ES |
168 | .llseek = bad_file_llseek, |
169 | .read = bad_file_read, | |
170 | .write = bad_file_write, | |
171 | .aio_read = bad_file_aio_read, | |
172 | .aio_write = bad_file_aio_write, | |
173 | .readdir = bad_file_readdir, | |
174 | .poll = bad_file_poll, | |
175 | .ioctl = bad_file_ioctl, | |
176 | .unlocked_ioctl = bad_file_unlocked_ioctl, | |
177 | .compat_ioctl = bad_file_compat_ioctl, | |
178 | .mmap = bad_file_mmap, | |
179 | .open = bad_file_open, | |
180 | .flush = bad_file_flush, | |
181 | .release = bad_file_release, | |
182 | .fsync = bad_file_fsync, | |
183 | .aio_fsync = bad_file_aio_fsync, | |
184 | .fasync = bad_file_fasync, | |
185 | .lock = bad_file_lock, | |
186 | .sendfile = bad_file_sendfile, | |
187 | .sendpage = bad_file_sendpage, | |
188 | .get_unmapped_area = bad_file_get_unmapped_area, | |
189 | .check_flags = bad_file_check_flags, | |
190 | .dir_notify = bad_file_dir_notify, | |
191 | .flock = bad_file_flock, | |
192 | .splice_write = bad_file_splice_write, | |
193 | .splice_read = bad_file_splice_read, | |
1da177e4 LT |
194 | }; |
195 | ||
be6aab0e ES |
196 | static int bad_inode_create (struct inode *dir, struct dentry *dentry, |
197 | int mode, struct nameidata *nd) | |
198 | { | |
199 | return -EIO; | |
200 | } | |
201 | ||
202 | static struct dentry *bad_inode_lookup(struct inode *dir, | |
203 | struct dentry *dentry, struct nameidata *nd) | |
204 | { | |
205 | return ERR_PTR(-EIO); | |
206 | } | |
207 | ||
208 | static int bad_inode_link (struct dentry *old_dentry, struct inode *dir, | |
209 | struct dentry *dentry) | |
210 | { | |
211 | return -EIO; | |
212 | } | |
213 | ||
214 | static int bad_inode_unlink(struct inode *dir, struct dentry *dentry) | |
215 | { | |
216 | return -EIO; | |
217 | } | |
218 | ||
219 | static int bad_inode_symlink (struct inode *dir, struct dentry *dentry, | |
220 | const char *symname) | |
221 | { | |
222 | return -EIO; | |
223 | } | |
224 | ||
225 | static int bad_inode_mkdir(struct inode *dir, struct dentry *dentry, | |
226 | int mode) | |
227 | { | |
228 | return -EIO; | |
229 | } | |
230 | ||
231 | static int bad_inode_rmdir (struct inode *dir, struct dentry *dentry) | |
232 | { | |
233 | return -EIO; | |
234 | } | |
235 | ||
236 | static int bad_inode_mknod (struct inode *dir, struct dentry *dentry, | |
237 | int mode, dev_t rdev) | |
238 | { | |
239 | return -EIO; | |
240 | } | |
241 | ||
242 | static int bad_inode_rename (struct inode *old_dir, struct dentry *old_dentry, | |
243 | struct inode *new_dir, struct dentry *new_dentry) | |
244 | { | |
245 | return -EIO; | |
246 | } | |
247 | ||
248 | static int bad_inode_readlink(struct dentry *dentry, char __user *buffer, | |
249 | int buflen) | |
250 | { | |
251 | return -EIO; | |
252 | } | |
253 | ||
254 | static int bad_inode_permission(struct inode *inode, int mask, | |
255 | struct nameidata *nd) | |
256 | { | |
257 | return -EIO; | |
258 | } | |
259 | ||
260 | static int bad_inode_getattr(struct vfsmount *mnt, struct dentry *dentry, | |
261 | struct kstat *stat) | |
262 | { | |
263 | return -EIO; | |
264 | } | |
265 | ||
266 | static int bad_inode_setattr(struct dentry *direntry, struct iattr *attrs) | |
267 | { | |
268 | return -EIO; | |
269 | } | |
270 | ||
271 | static int bad_inode_setxattr(struct dentry *dentry, const char *name, | |
272 | const void *value, size_t size, int flags) | |
273 | { | |
274 | return -EIO; | |
275 | } | |
276 | ||
277 | static ssize_t bad_inode_getxattr(struct dentry *dentry, const char *name, | |
278 | void *buffer, size_t size) | |
279 | { | |
280 | return -EIO; | |
281 | } | |
282 | ||
283 | static ssize_t bad_inode_listxattr(struct dentry *dentry, char *buffer, | |
284 | size_t buffer_size) | |
285 | { | |
286 | return -EIO; | |
287 | } | |
288 | ||
289 | static int bad_inode_removexattr(struct dentry *dentry, const char *name) | |
290 | { | |
291 | return -EIO; | |
292 | } | |
293 | ||
75c96f85 | 294 | static struct inode_operations bad_inode_ops = |
1da177e4 | 295 | { |
be6aab0e ES |
296 | .create = bad_inode_create, |
297 | .lookup = bad_inode_lookup, | |
298 | .link = bad_inode_link, | |
299 | .unlink = bad_inode_unlink, | |
300 | .symlink = bad_inode_symlink, | |
301 | .mkdir = bad_inode_mkdir, | |
302 | .rmdir = bad_inode_rmdir, | |
303 | .mknod = bad_inode_mknod, | |
304 | .rename = bad_inode_rename, | |
305 | .readlink = bad_inode_readlink, | |
1da177e4 LT |
306 | /* follow_link must be no-op, otherwise unmounting this inode |
307 | won't work */ | |
be6aab0e ES |
308 | /* put_link returns void */ |
309 | /* truncate returns void */ | |
310 | .permission = bad_inode_permission, | |
311 | .getattr = bad_inode_getattr, | |
312 | .setattr = bad_inode_setattr, | |
313 | .setxattr = bad_inode_setxattr, | |
314 | .getxattr = bad_inode_getxattr, | |
315 | .listxattr = bad_inode_listxattr, | |
316 | .removexattr = bad_inode_removexattr, | |
317 | /* truncate_range returns void */ | |
1da177e4 LT |
318 | }; |
319 | ||
320 | ||
321 | /* | |
322 | * When a filesystem is unable to read an inode due to an I/O error in | |
323 | * its read_inode() function, it can call make_bad_inode() to return a | |
324 | * set of stubs which will return EIO errors as required. | |
325 | * | |
326 | * We only need to do limited initialisation: all other fields are | |
327 | * preinitialised to zero automatically. | |
328 | */ | |
329 | ||
330 | /** | |
331 | * make_bad_inode - mark an inode bad due to an I/O error | |
332 | * @inode: Inode to mark bad | |
333 | * | |
334 | * When an inode cannot be read due to a media or remote network | |
335 | * failure this function makes the inode "bad" and causes I/O operations | |
336 | * on it to fail from this point on. | |
337 | */ | |
338 | ||
be6aab0e | 339 | void make_bad_inode(struct inode *inode) |
1da177e4 LT |
340 | { |
341 | remove_inode_hash(inode); | |
342 | ||
343 | inode->i_mode = S_IFREG; | |
344 | inode->i_atime = inode->i_mtime = inode->i_ctime = | |
345 | current_fs_time(inode->i_sb); | |
346 | inode->i_op = &bad_inode_ops; | |
347 | inode->i_fop = &bad_file_ops; | |
348 | } | |
349 | EXPORT_SYMBOL(make_bad_inode); | |
350 | ||
351 | /* | |
352 | * This tests whether an inode has been flagged as bad. The test uses | |
353 | * &bad_inode_ops to cover the case of invalidated inodes as well as | |
354 | * those created by make_bad_inode() above. | |
355 | */ | |
356 | ||
357 | /** | |
358 | * is_bad_inode - is an inode errored | |
359 | * @inode: inode to test | |
360 | * | |
361 | * Returns true if the inode in question has been marked as bad. | |
362 | */ | |
363 | ||
be6aab0e | 364 | int is_bad_inode(struct inode *inode) |
1da177e4 LT |
365 | { |
366 | return (inode->i_op == &bad_inode_ops); | |
367 | } | |
368 | ||
369 | EXPORT_SYMBOL(is_bad_inode); |