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/namei.h>
16 #include <linux/poll.h>
17
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_sendpage(struct file *file, struct page *page,
118 int off, size_t len, loff_t *pos, int more)
119 {
120 return -EIO;
121 }
122
123 static unsigned long bad_file_get_unmapped_area(struct file *file,
124 unsigned long addr, unsigned long len,
125 unsigned long pgoff, unsigned long flags)
126 {
127 return -EIO;
128 }
129
130 static int bad_file_check_flags(int flags)
131 {
132 return -EIO;
133 }
134
135 static int bad_file_flock(struct file *filp, int cmd, struct file_lock *fl)
136 {
137 return -EIO;
138 }
139
140 static ssize_t bad_file_splice_write(struct pipe_inode_info *pipe,
141 struct file *out, loff_t *ppos, size_t len,
142 unsigned int flags)
143 {
144 return -EIO;
145 }
146
147 static ssize_t bad_file_splice_read(struct file *in, loff_t *ppos,
148 struct pipe_inode_info *pipe, size_t len,
149 unsigned int flags)
150 {
151 return -EIO;
152 }
153
154 static const struct file_operations bad_file_ops =
155 {
156 .llseek = bad_file_llseek,
157 .read = bad_file_read,
158 .write = bad_file_write,
159 .aio_read = bad_file_aio_read,
160 .aio_write = bad_file_aio_write,
161 .readdir = bad_file_readdir,
162 .poll = bad_file_poll,
163 .ioctl = bad_file_ioctl,
164 .unlocked_ioctl = bad_file_unlocked_ioctl,
165 .compat_ioctl = bad_file_compat_ioctl,
166 .mmap = bad_file_mmap,
167 .open = bad_file_open,
168 .flush = bad_file_flush,
169 .release = bad_file_release,
170 .fsync = bad_file_fsync,
171 .aio_fsync = bad_file_aio_fsync,
172 .fasync = bad_file_fasync,
173 .lock = bad_file_lock,
174 .sendpage = bad_file_sendpage,
175 .get_unmapped_area = bad_file_get_unmapped_area,
176 .check_flags = bad_file_check_flags,
177 .flock = bad_file_flock,
178 .splice_write = bad_file_splice_write,
179 .splice_read = bad_file_splice_read,
180 };
181
182 static int bad_inode_create (struct inode *dir, struct dentry *dentry,
183 int mode, struct nameidata *nd)
184 {
185 return -EIO;
186 }
187
188 static struct dentry *bad_inode_lookup(struct inode *dir,
189 struct dentry *dentry, struct nameidata *nd)
190 {
191 return ERR_PTR(-EIO);
192 }
193
194 static int bad_inode_link (struct dentry *old_dentry, struct inode *dir,
195 struct dentry *dentry)
196 {
197 return -EIO;
198 }
199
200 static int bad_inode_unlink(struct inode *dir, struct dentry *dentry)
201 {
202 return -EIO;
203 }
204
205 static int bad_inode_symlink (struct inode *dir, struct dentry *dentry,
206 const char *symname)
207 {
208 return -EIO;
209 }
210
211 static int bad_inode_mkdir(struct inode *dir, struct dentry *dentry,
212 int mode)
213 {
214 return -EIO;
215 }
216
217 static int bad_inode_rmdir (struct inode *dir, struct dentry *dentry)
218 {
219 return -EIO;
220 }
221
222 static int bad_inode_mknod (struct inode *dir, struct dentry *dentry,
223 int mode, dev_t rdev)
224 {
225 return -EIO;
226 }
227
228 static int bad_inode_rename (struct inode *old_dir, struct dentry *old_dentry,
229 struct inode *new_dir, struct dentry *new_dentry)
230 {
231 return -EIO;
232 }
233
234 static int bad_inode_readlink(struct dentry *dentry, char __user *buffer,
235 int buflen)
236 {
237 return -EIO;
238 }
239
240 static int bad_inode_permission(struct inode *inode, int mask)
241 {
242 return -EIO;
243 }
244
245 static int bad_inode_getattr(struct vfsmount *mnt, struct dentry *dentry,
246 struct kstat *stat)
247 {
248 return -EIO;
249 }
250
251 static int bad_inode_setattr(struct dentry *direntry, struct iattr *attrs)
252 {
253 return -EIO;
254 }
255
256 static int bad_inode_setxattr(struct dentry *dentry, const char *name,
257 const void *value, size_t size, int flags)
258 {
259 return -EIO;
260 }
261
262 static ssize_t bad_inode_getxattr(struct dentry *dentry, const char *name,
263 void *buffer, size_t size)
264 {
265 return -EIO;
266 }
267
268 static ssize_t bad_inode_listxattr(struct dentry *dentry, char *buffer,
269 size_t buffer_size)
270 {
271 return -EIO;
272 }
273
274 static int bad_inode_removexattr(struct dentry *dentry, const char *name)
275 {
276 return -EIO;
277 }
278
279 static const struct inode_operations bad_inode_ops =
280 {
281 .create = bad_inode_create,
282 .lookup = bad_inode_lookup,
283 .link = bad_inode_link,
284 .unlink = bad_inode_unlink,
285 .symlink = bad_inode_symlink,
286 .mkdir = bad_inode_mkdir,
287 .rmdir = bad_inode_rmdir,
288 .mknod = bad_inode_mknod,
289 .rename = bad_inode_rename,
290 .readlink = bad_inode_readlink,
291 /* follow_link must be no-op, otherwise unmounting this inode
292 won't work */
293 /* put_link returns void */
294 /* truncate returns void */
295 .permission = bad_inode_permission,
296 .getattr = bad_inode_getattr,
297 .setattr = bad_inode_setattr,
298 .setxattr = bad_inode_setxattr,
299 .getxattr = bad_inode_getxattr,
300 .listxattr = bad_inode_listxattr,
301 .removexattr = bad_inode_removexattr,
302 /* truncate_range returns void */
303 };
304
305
306 /*
307 * When a filesystem is unable to read an inode due to an I/O error in
308 * its read_inode() function, it can call make_bad_inode() to return a
309 * set of stubs which will return EIO errors as required.
310 *
311 * We only need to do limited initialisation: all other fields are
312 * preinitialised to zero automatically.
313 */
314
315 /**
316 * make_bad_inode - mark an inode bad due to an I/O error
317 * @inode: Inode to mark bad
318 *
319 * When an inode cannot be read due to a media or remote network
320 * failure this function makes the inode "bad" and causes I/O operations
321 * on it to fail from this point on.
322 */
323
324 void make_bad_inode(struct inode *inode)
325 {
326 remove_inode_hash(inode);
327
328 inode->i_mode = S_IFREG;
329 inode->i_atime = inode->i_mtime = inode->i_ctime =
330 current_fs_time(inode->i_sb);
331 inode->i_op = &bad_inode_ops;
332 inode->i_fop = &bad_file_ops;
333 }
334 EXPORT_SYMBOL(make_bad_inode);
335
336 /*
337 * This tests whether an inode has been flagged as bad. The test uses
338 * &bad_inode_ops to cover the case of invalidated inodes as well as
339 * those created by make_bad_inode() above.
340 */
341
342 /**
343 * is_bad_inode - is an inode errored
344 * @inode: inode to test
345 *
346 * Returns true if the inode in question has been marked as bad.
347 */
348
349 int is_bad_inode(struct inode *inode)
350 {
351 return (inode->i_op == &bad_inode_ops);
352 }
353
354 EXPORT_SYMBOL(is_bad_inode);
355
356 /**
357 * iget_failed - Mark an under-construction inode as dead and release it
358 * @inode: The inode to discard
359 *
360 * Mark an under-construction inode as dead and release it.
361 */
362 void iget_failed(struct inode *inode)
363 {
364 make_bad_inode(inode);
365 unlock_new_inode(inode);
366 iput(inode);
367 }
368 EXPORT_SYMBOL(iget_failed);
369
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