blob: a05287a23f62e1d28d66b28dc101b74db3690971 [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>
Linus Torvalds1da177e2005-04-16 15:20:36 -070015#include <linux/namei.h>
Eric Sandeenbe6aab02007-01-05 16:36:36 -080016#include <linux/poll.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070017
Eric Sandeenbe6aab02007-01-05 16:36:36 -080018
19static loff_t bad_file_llseek(struct file *file, loff_t offset, int origin)
Linus Torvalds1da177e2005-04-16 15:20:36 -070020{
21 return -EIO;
22}
23
Eric Sandeenbe6aab02007-01-05 16:36:36 -080024static ssize_t bad_file_read(struct file *filp, char __user *buf,
25 size_t size, loff_t *ppos)
26{
27 return -EIO;
28}
29
30static 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
36static 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
42static 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
48static int bad_file_readdir(struct file *filp, void *dirent, filldir_t filldir)
49{
50 return -EIO;
51}
52
53static unsigned int bad_file_poll(struct file *filp, poll_table *wait)
54{
55 return POLLERR;
56}
57
58static int bad_file_ioctl (struct inode *inode, struct file *filp,
59 unsigned int cmd, unsigned long arg)
60{
61 return -EIO;
62}
63
64static long bad_file_unlocked_ioctl(struct file *file, unsigned cmd,
65 unsigned long arg)
66{
67 return -EIO;
68}
69
70static long bad_file_compat_ioctl(struct file *file, unsigned int cmd,
71 unsigned long arg)
72{
73 return -EIO;
74}
75
76static int bad_file_mmap(struct file *file, struct vm_area_struct *vma)
77{
78 return -EIO;
79}
80
81static int bad_file_open(struct inode *inode, struct file *filp)
82{
83 return -EIO;
84}
85
86static int bad_file_flush(struct file *file, fl_owner_t id)
87{
88 return -EIO;
89}
90
91static int bad_file_release(struct inode *inode, struct file *filp)
92{
93 return -EIO;
94}
95
96static int bad_file_fsync(struct file *file, struct dentry *dentry,
97 int datasync)
98{
99 return -EIO;
100}
101
102static int bad_file_aio_fsync(struct kiocb *iocb, int datasync)
103{
104 return -EIO;
105}
106
107static int bad_file_fasync(int fd, struct file *filp, int on)
108{
109 return -EIO;
110}
111
112static int bad_file_lock(struct file *file, int cmd, struct file_lock *fl)
113{
114 return -EIO;
115}
116
Eric Sandeenbe6aab02007-01-05 16:36:36 -0800117static 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
123static 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
130static int bad_file_check_flags(int flags)
131{
132 return -EIO;
133}
134
Eric Sandeenbe6aab02007-01-05 16:36:36 -0800135static int bad_file_flock(struct file *filp, int cmd, struct file_lock *fl)
136{
137 return -EIO;
138}
139
140static 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
147static 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}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700153
Arjan van de Ven4b6f5d22006-03-28 01:56:42 -0800154static const struct file_operations bad_file_ops =
Linus Torvalds1da177e2005-04-16 15:20:36 -0700155{
Eric Sandeenbe6aab02007-01-05 16:36:36 -0800156 .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,
Eric Sandeenbe6aab02007-01-05 16:36:36 -0800174 .sendpage = bad_file_sendpage,
175 .get_unmapped_area = bad_file_get_unmapped_area,
176 .check_flags = bad_file_check_flags,
Eric Sandeenbe6aab02007-01-05 16:36:36 -0800177 .flock = bad_file_flock,
178 .splice_write = bad_file_splice_write,
179 .splice_read = bad_file_splice_read,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700180};
181
Eric Sandeenbe6aab02007-01-05 16:36:36 -0800182static int bad_inode_create (struct inode *dir, struct dentry *dentry,
183 int mode, struct nameidata *nd)
184{
185 return -EIO;
186}
187
188static struct dentry *bad_inode_lookup(struct inode *dir,
189 struct dentry *dentry, struct nameidata *nd)
190{
191 return ERR_PTR(-EIO);
192}
193
194static int bad_inode_link (struct dentry *old_dentry, struct inode *dir,
195 struct dentry *dentry)
196{
197 return -EIO;
198}
199
200static int bad_inode_unlink(struct inode *dir, struct dentry *dentry)
201{
202 return -EIO;
203}
204
205static int bad_inode_symlink (struct inode *dir, struct dentry *dentry,
206 const char *symname)
207{
208 return -EIO;
209}
210
211static int bad_inode_mkdir(struct inode *dir, struct dentry *dentry,
212 int mode)
213{
214 return -EIO;
215}
216
217static int bad_inode_rmdir (struct inode *dir, struct dentry *dentry)
218{
219 return -EIO;
220}
221
222static int bad_inode_mknod (struct inode *dir, struct dentry *dentry,
223 int mode, dev_t rdev)
224{
225 return -EIO;
226}
227
228static 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
234static int bad_inode_readlink(struct dentry *dentry, char __user *buffer,
235 int buflen)
236{
237 return -EIO;
238}
239
Al Viroe6305c42008-07-15 21:03:57 -0400240static int bad_inode_permission(struct inode *inode, int mask)
Eric Sandeenbe6aab02007-01-05 16:36:36 -0800241{
242 return -EIO;
243}
244
245static int bad_inode_getattr(struct vfsmount *mnt, struct dentry *dentry,
246 struct kstat *stat)
247{
248 return -EIO;
249}
250
251static int bad_inode_setattr(struct dentry *direntry, struct iattr *attrs)
252{
253 return -EIO;
254}
255
256static 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
262static ssize_t bad_inode_getxattr(struct dentry *dentry, const char *name,
263 void *buffer, size_t size)
264{
265 return -EIO;
266}
267
268static ssize_t bad_inode_listxattr(struct dentry *dentry, char *buffer,
269 size_t buffer_size)
270{
271 return -EIO;
272}
273
274static int bad_inode_removexattr(struct dentry *dentry, const char *name)
275{
276 return -EIO;
277}
278
Arjan van de Ven754661f2007-02-12 00:55:38 -0800279static const struct inode_operations bad_inode_ops =
Linus Torvalds1da177e2005-04-16 15:20:36 -0700280{
Eric Sandeenbe6aab02007-01-05 16:36:36 -0800281 .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,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700291 /* follow_link must be no-op, otherwise unmounting this inode
292 won't work */
Eric Sandeenbe6aab02007-01-05 16:36:36 -0800293 /* 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 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700303};
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
Eric Sandeenbe6aab02007-01-05 16:36:36 -0800324void make_bad_inode(struct inode *inode)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700325{
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}
334EXPORT_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
Eric Sandeenbe6aab02007-01-05 16:36:36 -0800349int is_bad_inode(struct inode *inode)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700350{
351 return (inode->i_op == &bad_inode_ops);
352}
353
354EXPORT_SYMBOL(is_bad_inode);
David Howellsb46980f2008-02-07 00:15:27 -0800355
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 */
362void iget_failed(struct inode *inode)
363{
364 make_bad_inode(inode);
365 unlock_new_inode(inode);
366 iput(inode);
367}
368EXPORT_SYMBOL(iget_failed);