4 * Copyright (C) 1997, Stephen Tweedie
6 * Provide stub functions for unreadable inodes
8 * Fabian Frederick : August 2003 - All file operations assigned to EIO
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>
17 #include <linux/poll.h>
20 static loff_t bad_file_llseek(struct file *file, loff_t offset, int origin)
25 static ssize_t bad_file_read(struct file *filp, char __user *buf,
26 size_t size, loff_t *ppos)
31 static ssize_t bad_file_write(struct file *filp, const char __user *buf,
32 size_t siz, loff_t *ppos)
37 static ssize_t bad_file_aio_read(struct kiocb *iocb, const struct iovec *iov,
38 unsigned long nr_segs, loff_t pos)
43 static ssize_t bad_file_aio_write(struct kiocb *iocb, const struct iovec *iov,
44 unsigned long nr_segs, loff_t pos)
49 static int bad_file_readdir(struct file *filp, void *dirent, filldir_t filldir)
54 static unsigned int bad_file_poll(struct file *filp, poll_table *wait)
59 static int bad_file_ioctl (struct inode *inode, struct file *filp,
60 unsigned int cmd, unsigned long arg)
65 static long bad_file_unlocked_ioctl(struct file *file, unsigned cmd,
71 static long bad_file_compat_ioctl(struct file *file, unsigned int cmd,
77 static int bad_file_mmap(struct file *file, struct vm_area_struct *vma)
82 static int bad_file_open(struct inode *inode, struct file *filp)
87 static int bad_file_flush(struct file *file, fl_owner_t id)
92 static int bad_file_release(struct inode *inode, struct file *filp)
97 static int bad_file_fsync(struct file *file, struct dentry *dentry,
103 static int bad_file_aio_fsync(struct kiocb *iocb, int datasync)
108 static int bad_file_fasync(int fd, struct file *filp, int on)
113 static int bad_file_lock(struct file *file, int cmd, struct file_lock *fl)
118 static ssize_t bad_file_sendfile(struct file *in_file, loff_t *ppos,
119 size_t count, read_actor_t actor, void *target)
124 static ssize_t bad_file_sendpage(struct file *file, struct page *page,
125 int off, size_t len, loff_t *pos, int more)
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)
137 static int bad_file_check_flags(int flags)
142 static int bad_file_dir_notify(struct file *file, unsigned long arg)
147 static int bad_file_flock(struct file *filp, int cmd, struct file_lock *fl)
152 static ssize_t bad_file_splice_write(struct pipe_inode_info *pipe,
153 struct file *out, loff_t *ppos, size_t len,
159 static ssize_t bad_file_splice_read(struct file *in, loff_t *ppos,
160 struct pipe_inode_info *pipe, size_t len,
166 static const struct file_operations bad_file_ops =
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,
196 static int bad_inode_create (struct inode *dir, struct dentry *dentry,
197 int mode, struct nameidata *nd)
202 static struct dentry *bad_inode_lookup(struct inode *dir,
203 struct dentry *dentry, struct nameidata *nd)
205 return ERR_PTR(-EIO);
208 static int bad_inode_link (struct dentry *old_dentry, struct inode *dir,
209 struct dentry *dentry)
214 static int bad_inode_unlink(struct inode *dir, struct dentry *dentry)
219 static int bad_inode_symlink (struct inode *dir, struct dentry *dentry,
225 static int bad_inode_mkdir(struct inode *dir, struct dentry *dentry,
231 static int bad_inode_rmdir (struct inode *dir, struct dentry *dentry)
236 static int bad_inode_mknod (struct inode *dir, struct dentry *dentry,
237 int mode, dev_t rdev)
242 static int bad_inode_rename (struct inode *old_dir, struct dentry *old_dentry,
243 struct inode *new_dir, struct dentry *new_dentry)
248 static int bad_inode_readlink(struct dentry *dentry, char __user *buffer,
254 static int bad_inode_permission(struct inode *inode, int mask,
255 struct nameidata *nd)
260 static int bad_inode_getattr(struct vfsmount *mnt, struct dentry *dentry,
266 static int bad_inode_setattr(struct dentry *direntry, struct iattr *attrs)
271 static int bad_inode_setxattr(struct dentry *dentry, const char *name,
272 const void *value, size_t size, int flags)
277 static ssize_t bad_inode_getxattr(struct dentry *dentry, const char *name,
278 void *buffer, size_t size)
283 static ssize_t bad_inode_listxattr(struct dentry *dentry, char *buffer,
289 static int bad_inode_removexattr(struct dentry *dentry, const char *name)
294 static struct inode_operations bad_inode_ops =
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,
306 /* follow_link must be no-op, otherwise unmounting this inode
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 */
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.
326 * We only need to do limited initialisation: all other fields are
327 * preinitialised to zero automatically.
331 * make_bad_inode - mark an inode bad due to an I/O error
332 * @inode: Inode to mark bad
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.
339 void make_bad_inode(struct inode *inode)
341 remove_inode_hash(inode);
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;
349 EXPORT_SYMBOL(make_bad_inode);
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.
358 * is_bad_inode - is an inode errored
359 * @inode: inode to test
361 * Returns true if the inode in question has been marked as bad.
364 int is_bad_inode(struct inode *inode)
366 return (inode->i_op == &bad_inode_ops);
369 EXPORT_SYMBOL(is_bad_inode);