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/namei.h>
16 #include <linux/poll.h>
19 static loff_t bad_file_llseek(struct file *file, loff_t offset, int origin)
24 static ssize_t bad_file_read(struct file *filp, char __user *buf,
25 size_t size, loff_t *ppos)
30 static ssize_t bad_file_write(struct file *filp, const char __user *buf,
31 size_t siz, loff_t *ppos)
36 static ssize_t bad_file_aio_read(struct kiocb *iocb, const struct iovec *iov,
37 unsigned long nr_segs, loff_t pos)
42 static ssize_t bad_file_aio_write(struct kiocb *iocb, const struct iovec *iov,
43 unsigned long nr_segs, loff_t pos)
48 static int bad_file_readdir(struct file *filp, void *dirent, filldir_t filldir)
53 static unsigned int bad_file_poll(struct file *filp, poll_table *wait)
58 static long bad_file_unlocked_ioctl(struct file *file, unsigned cmd,
64 static long bad_file_compat_ioctl(struct file *file, unsigned int cmd,
70 static int bad_file_mmap(struct file *file, struct vm_area_struct *vma)
75 static int bad_file_open(struct inode *inode, struct file *filp)
80 static int bad_file_flush(struct file *file, fl_owner_t id)
85 static int bad_file_release(struct inode *inode, struct file *filp)
90 static int bad_file_fsync(struct file *file, int datasync)
95 static int bad_file_aio_fsync(struct kiocb *iocb, int datasync)
100 static int bad_file_fasync(int fd, struct file *filp, int on)
105 static int bad_file_lock(struct file *file, int cmd, struct file_lock *fl)
110 static ssize_t bad_file_sendpage(struct file *file, struct page *page,
111 int off, size_t len, loff_t *pos, int more)
116 static unsigned long bad_file_get_unmapped_area(struct file *file,
117 unsigned long addr, unsigned long len,
118 unsigned long pgoff, unsigned long flags)
123 static int bad_file_check_flags(int flags)
128 static int bad_file_flock(struct file *filp, int cmd, struct file_lock *fl)
133 static ssize_t bad_file_splice_write(struct pipe_inode_info *pipe,
134 struct file *out, loff_t *ppos, size_t len,
140 static ssize_t bad_file_splice_read(struct file *in, loff_t *ppos,
141 struct pipe_inode_info *pipe, size_t len,
147 static const struct file_operations bad_file_ops =
149 .llseek = bad_file_llseek,
150 .read = bad_file_read,
151 .write = bad_file_write,
152 .aio_read = bad_file_aio_read,
153 .aio_write = bad_file_aio_write,
154 .readdir = bad_file_readdir,
155 .poll = bad_file_poll,
156 .unlocked_ioctl = bad_file_unlocked_ioctl,
157 .compat_ioctl = bad_file_compat_ioctl,
158 .mmap = bad_file_mmap,
159 .open = bad_file_open,
160 .flush = bad_file_flush,
161 .release = bad_file_release,
162 .fsync = bad_file_fsync,
163 .aio_fsync = bad_file_aio_fsync,
164 .fasync = bad_file_fasync,
165 .lock = bad_file_lock,
166 .sendpage = bad_file_sendpage,
167 .get_unmapped_area = bad_file_get_unmapped_area,
168 .check_flags = bad_file_check_flags,
169 .flock = bad_file_flock,
170 .splice_write = bad_file_splice_write,
171 .splice_read = bad_file_splice_read,
174 static int bad_inode_create (struct inode *dir, struct dentry *dentry,
175 int mode, struct nameidata *nd)
180 static struct dentry *bad_inode_lookup(struct inode *dir,
181 struct dentry *dentry, struct nameidata *nd)
183 return ERR_PTR(-EIO);
186 static int bad_inode_link (struct dentry *old_dentry, struct inode *dir,
187 struct dentry *dentry)
192 static int bad_inode_unlink(struct inode *dir, struct dentry *dentry)
197 static int bad_inode_symlink (struct inode *dir, struct dentry *dentry,
203 static int bad_inode_mkdir(struct inode *dir, struct dentry *dentry,
209 static int bad_inode_rmdir (struct inode *dir, struct dentry *dentry)
214 static int bad_inode_mknod (struct inode *dir, struct dentry *dentry,
215 int mode, dev_t rdev)
220 static int bad_inode_rename (struct inode *old_dir, struct dentry *old_dentry,
221 struct inode *new_dir, struct dentry *new_dentry)
226 static int bad_inode_readlink(struct dentry *dentry, char __user *buffer,
232 static int bad_inode_permission(struct inode *inode, int mask, unsigned int flags)
234 if (flags & IPERM_FLAG_RCU)
240 static int bad_inode_getattr(struct vfsmount *mnt, struct dentry *dentry,
246 static int bad_inode_setattr(struct dentry *direntry, struct iattr *attrs)
251 static int bad_inode_setxattr(struct dentry *dentry, const char *name,
252 const void *value, size_t size, int flags)
257 static ssize_t bad_inode_getxattr(struct dentry *dentry, const char *name,
258 void *buffer, size_t size)
263 static ssize_t bad_inode_listxattr(struct dentry *dentry, char *buffer,
269 static int bad_inode_removexattr(struct dentry *dentry, const char *name)
274 static const struct inode_operations bad_inode_ops =
276 .create = bad_inode_create,
277 .lookup = bad_inode_lookup,
278 .link = bad_inode_link,
279 .unlink = bad_inode_unlink,
280 .symlink = bad_inode_symlink,
281 .mkdir = bad_inode_mkdir,
282 .rmdir = bad_inode_rmdir,
283 .mknod = bad_inode_mknod,
284 .rename = bad_inode_rename,
285 .readlink = bad_inode_readlink,
286 /* follow_link must be no-op, otherwise unmounting this inode
288 /* put_link returns void */
289 /* truncate returns void */
290 .permission = bad_inode_permission,
291 .getattr = bad_inode_getattr,
292 .setattr = bad_inode_setattr,
293 .setxattr = bad_inode_setxattr,
294 .getxattr = bad_inode_getxattr,
295 .listxattr = bad_inode_listxattr,
296 .removexattr = bad_inode_removexattr,
297 /* truncate_range returns void */
302 * When a filesystem is unable to read an inode due to an I/O error in
303 * its read_inode() function, it can call make_bad_inode() to return a
304 * set of stubs which will return EIO errors as required.
306 * We only need to do limited initialisation: all other fields are
307 * preinitialised to zero automatically.
311 * make_bad_inode - mark an inode bad due to an I/O error
312 * @inode: Inode to mark bad
314 * When an inode cannot be read due to a media or remote network
315 * failure this function makes the inode "bad" and causes I/O operations
316 * on it to fail from this point on.
319 void make_bad_inode(struct inode *inode)
321 remove_inode_hash(inode);
323 inode->i_mode = S_IFREG;
324 inode->i_atime = inode->i_mtime = inode->i_ctime =
325 current_fs_time(inode->i_sb);
326 inode->i_op = &bad_inode_ops;
327 inode->i_fop = &bad_file_ops;
329 EXPORT_SYMBOL(make_bad_inode);
332 * This tests whether an inode has been flagged as bad. The test uses
333 * &bad_inode_ops to cover the case of invalidated inodes as well as
334 * those created by make_bad_inode() above.
338 * is_bad_inode - is an inode errored
339 * @inode: inode to test
341 * Returns true if the inode in question has been marked as bad.
344 int is_bad_inode(struct inode *inode)
346 return (inode->i_op == &bad_inode_ops);
349 EXPORT_SYMBOL(is_bad_inode);
352 * iget_failed - Mark an under-construction inode as dead and release it
353 * @inode: The inode to discard
355 * Mark an under-construction inode as dead and release it.
357 void iget_failed(struct inode *inode)
359 make_bad_inode(inode);
360 unlock_new_inode(inode);
363 EXPORT_SYMBOL(iget_failed);