blob: efeab2fab40b743e55718de1c365ec278804664c [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
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>
Eric Sandeenbe6aab02007-01-05 16:36:36 -080017#include <linux/poll.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070018
Eric Sandeenbe6aab02007-01-05 16:36:36 -080019
20static loff_t bad_file_llseek(struct file *file, loff_t offset, int origin)
Linus Torvalds1da177e2005-04-16 15:20:36 -070021{
22 return -EIO;
23}
24
Eric Sandeenbe6aab02007-01-05 16:36:36 -080025static ssize_t bad_file_read(struct file *filp, char __user *buf,
26 size_t size, loff_t *ppos)
27{
28 return -EIO;
29}
30
31static 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
37static 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
43static 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
49static int bad_file_readdir(struct file *filp, void *dirent, filldir_t filldir)
50{
51 return -EIO;
52}
53
54static unsigned int bad_file_poll(struct file *filp, poll_table *wait)
55{
56 return POLLERR;
57}
58
59static int bad_file_ioctl (struct inode *inode, struct file *filp,
60 unsigned int cmd, unsigned long arg)
61{
62 return -EIO;
63}
64
65static long bad_file_unlocked_ioctl(struct file *file, unsigned cmd,
66 unsigned long arg)
67{
68 return -EIO;
69}
70
71static long bad_file_compat_ioctl(struct file *file, unsigned int cmd,
72 unsigned long arg)
73{
74 return -EIO;
75}
76
77static int bad_file_mmap(struct file *file, struct vm_area_struct *vma)
78{
79 return -EIO;
80}
81
82static int bad_file_open(struct inode *inode, struct file *filp)
83{
84 return -EIO;
85}
86
87static int bad_file_flush(struct file *file, fl_owner_t id)
88{
89 return -EIO;
90}
91
92static int bad_file_release(struct inode *inode, struct file *filp)
93{
94 return -EIO;
95}
96
97static int bad_file_fsync(struct file *file, struct dentry *dentry,
98 int datasync)
99{
100 return -EIO;
101}
102
103static int bad_file_aio_fsync(struct kiocb *iocb, int datasync)
104{
105 return -EIO;
106}
107
108static int bad_file_fasync(int fd, struct file *filp, int on)
109{
110 return -EIO;
111}
112
113static int bad_file_lock(struct file *file, int cmd, struct file_lock *fl)
114{
115 return -EIO;
116}
117
118static 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
124static 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
130static 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
137static int bad_file_check_flags(int flags)
138{
139 return -EIO;
140}
141
142static int bad_file_dir_notify(struct file *file, unsigned long arg)
143{
144 return -EIO;
145}
146
147static int bad_file_flock(struct file *filp, int cmd, struct file_lock *fl)
148{
149 return -EIO;
150}
151
152static 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
159static 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}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700165
Arjan van de Ven4b6f5d22006-03-28 01:56:42 -0800166static const struct file_operations bad_file_ops =
Linus Torvalds1da177e2005-04-16 15:20:36 -0700167{
Eric Sandeenbe6aab02007-01-05 16:36:36 -0800168 .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,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700194};
195
Eric Sandeenbe6aab02007-01-05 16:36:36 -0800196static int bad_inode_create (struct inode *dir, struct dentry *dentry,
197 int mode, struct nameidata *nd)
198{
199 return -EIO;
200}
201
202static struct dentry *bad_inode_lookup(struct inode *dir,
203 struct dentry *dentry, struct nameidata *nd)
204{
205 return ERR_PTR(-EIO);
206}
207
208static int bad_inode_link (struct dentry *old_dentry, struct inode *dir,
209 struct dentry *dentry)
210{
211 return -EIO;
212}
213
214static int bad_inode_unlink(struct inode *dir, struct dentry *dentry)
215{
216 return -EIO;
217}
218
219static int bad_inode_symlink (struct inode *dir, struct dentry *dentry,
220 const char *symname)
221{
222 return -EIO;
223}
224
225static int bad_inode_mkdir(struct inode *dir, struct dentry *dentry,
226 int mode)
227{
228 return -EIO;
229}
230
231static int bad_inode_rmdir (struct inode *dir, struct dentry *dentry)
232{
233 return -EIO;
234}
235
236static int bad_inode_mknod (struct inode *dir, struct dentry *dentry,
237 int mode, dev_t rdev)
238{
239 return -EIO;
240}
241
242static 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
248static int bad_inode_readlink(struct dentry *dentry, char __user *buffer,
249 int buflen)
250{
251 return -EIO;
252}
253
254static int bad_inode_permission(struct inode *inode, int mask,
255 struct nameidata *nd)
256{
257 return -EIO;
258}
259
260static int bad_inode_getattr(struct vfsmount *mnt, struct dentry *dentry,
261 struct kstat *stat)
262{
263 return -EIO;
264}
265
266static int bad_inode_setattr(struct dentry *direntry, struct iattr *attrs)
267{
268 return -EIO;
269}
270
271static 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
277static ssize_t bad_inode_getxattr(struct dentry *dentry, const char *name,
278 void *buffer, size_t size)
279{
280 return -EIO;
281}
282
283static ssize_t bad_inode_listxattr(struct dentry *dentry, char *buffer,
284 size_t buffer_size)
285{
286 return -EIO;
287}
288
289static int bad_inode_removexattr(struct dentry *dentry, const char *name)
290{
291 return -EIO;
292}
293
Arjan van de Ven754661f2007-02-12 00:55:38 -0800294static const struct inode_operations bad_inode_ops =
Linus Torvalds1da177e2005-04-16 15:20:36 -0700295{
Eric Sandeenbe6aab02007-01-05 16:36:36 -0800296 .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,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700306 /* follow_link must be no-op, otherwise unmounting this inode
307 won't work */
Eric Sandeenbe6aab02007-01-05 16:36:36 -0800308 /* 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 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700318};
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
Eric Sandeenbe6aab02007-01-05 16:36:36 -0800339void make_bad_inode(struct inode *inode)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700340{
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}
349EXPORT_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
Eric Sandeenbe6aab02007-01-05 16:36:36 -0800364int is_bad_inode(struct inode *inode)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700365{
366 return (inode->i_op == &bad_inode_ops);
367}
368
369EXPORT_SYMBOL(is_bad_inode);