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Linux/fs/bad_inode.c

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  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/export.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 whence)
 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 *file, struct dir_context *ctx)
 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 long bad_file_unlocked_ioctl(struct file *file, unsigned cmd,
 59                         unsigned long arg)
 60 {
 61         return -EIO;
 62 }
 63 
 64 static long bad_file_compat_ioctl(struct file *file, unsigned int cmd,
 65                         unsigned long arg)
 66 {
 67         return -EIO;
 68 }
 69 
 70 static int bad_file_mmap(struct file *file, struct vm_area_struct *vma)
 71 {
 72         return -EIO;
 73 }
 74 
 75 static int bad_file_open(struct inode *inode, struct file *filp)
 76 {
 77         return -EIO;
 78 }
 79 
 80 static int bad_file_flush(struct file *file, fl_owner_t id)
 81 {
 82         return -EIO;
 83 }
 84 
 85 static int bad_file_release(struct inode *inode, struct file *filp)
 86 {
 87         return -EIO;
 88 }
 89 
 90 static int bad_file_fsync(struct file *file, loff_t start, loff_t end,
 91                           int datasync)
 92 {
 93         return -EIO;
 94 }
 95 
 96 static int bad_file_aio_fsync(struct kiocb *iocb, int datasync)
 97 {
 98         return -EIO;
 99 }
100 
101 static int bad_file_fasync(int fd, struct file *filp, int on)
102 {
103         return -EIO;
104 }
105 
106 static int bad_file_lock(struct file *file, int cmd, struct file_lock *fl)
107 {
108         return -EIO;
109 }
110 
111 static ssize_t bad_file_sendpage(struct file *file, struct page *page,
112                         int off, size_t len, loff_t *pos, int more)
113 {
114         return -EIO;
115 }
116 
117 static unsigned long bad_file_get_unmapped_area(struct file *file,
118                                 unsigned long addr, unsigned long len,
119                                 unsigned long pgoff, unsigned long flags)
120 {
121         return -EIO;
122 }
123 
124 static int bad_file_check_flags(int flags)
125 {
126         return -EIO;
127 }
128 
129 static int bad_file_flock(struct file *filp, int cmd, struct file_lock *fl)
130 {
131         return -EIO;
132 }
133 
134 static ssize_t bad_file_splice_write(struct pipe_inode_info *pipe,
135                         struct file *out, loff_t *ppos, size_t len,
136                         unsigned int flags)
137 {
138         return -EIO;
139 }
140 
141 static ssize_t bad_file_splice_read(struct file *in, loff_t *ppos,
142                         struct pipe_inode_info *pipe, size_t len,
143                         unsigned int flags)
144 {
145         return -EIO;
146 }
147 
148 static const struct file_operations bad_file_ops =
149 {
150         .llseek         = bad_file_llseek,
151         .read           = bad_file_read,
152         .write          = bad_file_write,
153         .aio_read       = bad_file_aio_read,
154         .aio_write      = bad_file_aio_write,
155         .iterate        = bad_file_readdir,
156         .poll           = bad_file_poll,
157         .unlocked_ioctl = bad_file_unlocked_ioctl,
158         .compat_ioctl   = bad_file_compat_ioctl,
159         .mmap           = bad_file_mmap,
160         .open           = bad_file_open,
161         .flush          = bad_file_flush,
162         .release        = bad_file_release,
163         .fsync          = bad_file_fsync,
164         .aio_fsync      = bad_file_aio_fsync,
165         .fasync         = bad_file_fasync,
166         .lock           = bad_file_lock,
167         .sendpage       = bad_file_sendpage,
168         .get_unmapped_area = bad_file_get_unmapped_area,
169         .check_flags    = bad_file_check_flags,
170         .flock          = bad_file_flock,
171         .splice_write   = bad_file_splice_write,
172         .splice_read    = bad_file_splice_read,
173 };
174 
175 static int bad_inode_create (struct inode *dir, struct dentry *dentry,
176                 umode_t mode, bool excl)
177 {
178         return -EIO;
179 }
180 
181 static struct dentry *bad_inode_lookup(struct inode *dir,
182                         struct dentry *dentry, unsigned int flags)
183 {
184         return ERR_PTR(-EIO);
185 }
186 
187 static int bad_inode_link (struct dentry *old_dentry, struct inode *dir,
188                 struct dentry *dentry)
189 {
190         return -EIO;
191 }
192 
193 static int bad_inode_unlink(struct inode *dir, struct dentry *dentry)
194 {
195         return -EIO;
196 }
197 
198 static int bad_inode_symlink (struct inode *dir, struct dentry *dentry,
199                 const char *symname)
200 {
201         return -EIO;
202 }
203 
204 static int bad_inode_mkdir(struct inode *dir, struct dentry *dentry,
205                         umode_t mode)
206 {
207         return -EIO;
208 }
209 
210 static int bad_inode_rmdir (struct inode *dir, struct dentry *dentry)
211 {
212         return -EIO;
213 }
214 
215 static int bad_inode_mknod (struct inode *dir, struct dentry *dentry,
216                         umode_t mode, dev_t rdev)
217 {
218         return -EIO;
219 }
220 
221 static int bad_inode_rename2(struct inode *old_dir, struct dentry *old_dentry,
222                              struct inode *new_dir, struct dentry *new_dentry,
223                              unsigned int flags)
224 {
225         return -EIO;
226 }
227 
228 static int bad_inode_readlink(struct dentry *dentry, char __user *buffer,
229                 int buflen)
230 {
231         return -EIO;
232 }
233 
234 static int bad_inode_permission(struct inode *inode, int mask)
235 {
236         return -EIO;
237 }
238 
239 static int bad_inode_getattr(struct vfsmount *mnt, struct dentry *dentry,
240                         struct kstat *stat)
241 {
242         return -EIO;
243 }
244 
245 static int bad_inode_setattr(struct dentry *direntry, struct iattr *attrs)
246 {
247         return -EIO;
248 }
249 
250 static int bad_inode_setxattr(struct dentry *dentry, const char *name,
251                 const void *value, size_t size, int flags)
252 {
253         return -EIO;
254 }
255 
256 static ssize_t bad_inode_getxattr(struct dentry *dentry, const char *name,
257                         void *buffer, size_t size)
258 {
259         return -EIO;
260 }
261 
262 static ssize_t bad_inode_listxattr(struct dentry *dentry, char *buffer,
263                         size_t buffer_size)
264 {
265         return -EIO;
266 }
267 
268 static int bad_inode_removexattr(struct dentry *dentry, const char *name)
269 {
270         return -EIO;
271 }
272 
273 static const struct inode_operations bad_inode_ops =
274 {
275         .create         = bad_inode_create,
276         .lookup         = bad_inode_lookup,
277         .link           = bad_inode_link,
278         .unlink         = bad_inode_unlink,
279         .symlink        = bad_inode_symlink,
280         .mkdir          = bad_inode_mkdir,
281         .rmdir          = bad_inode_rmdir,
282         .mknod          = bad_inode_mknod,
283         .rename2        = bad_inode_rename2,
284         .readlink       = bad_inode_readlink,
285         /* follow_link must be no-op, otherwise unmounting this inode
286            won't work */
287         /* put_link returns void */
288         /* truncate returns void */
289         .permission     = bad_inode_permission,
290         .getattr        = bad_inode_getattr,
291         .setattr        = bad_inode_setattr,
292         .setxattr       = bad_inode_setxattr,
293         .getxattr       = bad_inode_getxattr,
294         .listxattr      = bad_inode_listxattr,
295         .removexattr    = bad_inode_removexattr,
296 };
297 
298 
299 /*
300  * When a filesystem is unable to read an inode due to an I/O error in
301  * its read_inode() function, it can call make_bad_inode() to return a
302  * set of stubs which will return EIO errors as required. 
303  *
304  * We only need to do limited initialisation: all other fields are
305  * preinitialised to zero automatically.
306  */
307  
308 /**
309  *      make_bad_inode - mark an inode bad due to an I/O error
310  *      @inode: Inode to mark bad
311  *
312  *      When an inode cannot be read due to a media or remote network
313  *      failure this function makes the inode "bad" and causes I/O operations
314  *      on it to fail from this point on.
315  */
316  
317 void make_bad_inode(struct inode *inode)
318 {
319         remove_inode_hash(inode);
320 
321         inode->i_mode = S_IFREG;
322         inode->i_atime = inode->i_mtime = inode->i_ctime =
323                 current_fs_time(inode->i_sb);
324         inode->i_op = &bad_inode_ops;   
325         inode->i_fop = &bad_file_ops;   
326 }
327 EXPORT_SYMBOL(make_bad_inode);
328 
329 /*
330  * This tests whether an inode has been flagged as bad. The test uses
331  * &bad_inode_ops to cover the case of invalidated inodes as well as
332  * those created by make_bad_inode() above.
333  */
334  
335 /**
336  *      is_bad_inode - is an inode errored
337  *      @inode: inode to test
338  *
339  *      Returns true if the inode in question has been marked as bad.
340  */
341  
342 int is_bad_inode(struct inode *inode)
343 {
344         return (inode->i_op == &bad_inode_ops); 
345 }
346 
347 EXPORT_SYMBOL(is_bad_inode);
348 
349 /**
350  * iget_failed - Mark an under-construction inode as dead and release it
351  * @inode: The inode to discard
352  *
353  * Mark an under-construction inode as dead and release it.
354  */
355 void iget_failed(struct inode *inode)
356 {
357         make_bad_inode(inode);
358         unlock_new_inode(inode);
359         iput(inode);
360 }
361 EXPORT_SYMBOL(iget_failed);
362 

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