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/module.h> 13#include <linux/stat.h> 14#include <linux/time.h> 15#include <linux/namei.h> 16#include <linux/poll.h> 17 18 19static loff_t bad_file_llseek(struct file *file, loff_t offset, int origin) 20{ 21 return -EIO; 22} 23 24static 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 long bad_file_unlocked_ioctl(struct file *file, unsigned cmd, 59 unsigned long arg) 60{ 61 return -EIO; 62} 63 64static long bad_file_compat_ioctl(struct file *file, unsigned int cmd, 65 unsigned long arg) 66{ 67 return -EIO; 68} 69 70static int bad_file_mmap(struct file *file, struct vm_area_struct *vma) 71{ 72 return -EIO; 73} 74 75static int bad_file_open(struct inode *inode, struct file *filp) 76{ 77 return -EIO; 78} 79 80static int bad_file_flush(struct file *file, fl_owner_t id) 81{ 82 return -EIO; 83} 84 85static int bad_file_release(struct inode *inode, struct file *filp) 86{ 87 return -EIO; 88} 89 90static int bad_file_fsync(struct file *file, int datasync) 91{ 92 return -EIO; 93} 94 95static int bad_file_aio_fsync(struct kiocb *iocb, int datasync) 96{ 97 return -EIO; 98} 99 100static int bad_file_fasync(int fd, struct file *filp, int on) 101{ 102 return -EIO; 103} 104 105static int bad_file_lock(struct file *file, int cmd, struct file_lock *fl) 106{ 107 return -EIO; 108} 109 110static ssize_t bad_file_sendpage(struct file *file, struct page *page, 111 int off, size_t len, loff_t *pos, int more) 112{ 113 return -EIO; 114} 115 116static unsigned long bad_file_get_unmapped_area(struct file *file, 117 unsigned long addr, unsigned long len, 118 unsigned long pgoff, unsigned long flags) 119{ 120 return -EIO; 121} 122 123static int bad_file_check_flags(int flags) 124{ 125 return -EIO; 126} 127 128static int bad_file_flock(struct file *filp, int cmd, struct file_lock *fl) 129{ 130 return -EIO; 131} 132 133static ssize_t bad_file_splice_write(struct pipe_inode_info *pipe, 134 struct file *out, loff_t *ppos, size_t len, 135 unsigned int flags) 136{ 137 return -EIO; 138} 139 140static ssize_t bad_file_splice_read(struct file *in, loff_t *ppos, 141 struct pipe_inode_info *pipe, size_t len, 142 unsigned int flags) 143{ 144 return -EIO; 145} 146 147static const struct file_operations bad_file_ops = 148{ 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, 172}; 173 174static int bad_inode_create (struct inode *dir, struct dentry *dentry, 175 int mode, struct nameidata *nd) 176{ 177 return -EIO; 178} 179 180static struct dentry *bad_inode_lookup(struct inode *dir, 181 struct dentry *dentry, struct nameidata *nd) 182{ 183 return ERR_PTR(-EIO); 184} 185 186static int bad_inode_link (struct dentry *old_dentry, struct inode *dir, 187 struct dentry *dentry) 188{ 189 return -EIO; 190} 191 192static int bad_inode_unlink(struct inode *dir, struct dentry *dentry) 193{ 194 return -EIO; 195} 196 197static int bad_inode_symlink (struct inode *dir, struct dentry *dentry, 198 const char *symname) 199{ 200 return -EIO; 201} 202 203static int bad_inode_mkdir(struct inode *dir, struct dentry *dentry, 204 int mode) 205{ 206 return -EIO; 207} 208 209static int bad_inode_rmdir (struct inode *dir, struct dentry *dentry) 210{ 211 return -EIO; 212} 213 214static int bad_inode_mknod (struct inode *dir, struct dentry *dentry, 215 int mode, dev_t rdev) 216{ 217 return -EIO; 218} 219 220static int bad_inode_rename (struct inode *old_dir, struct dentry *old_dentry, 221 struct inode *new_dir, struct dentry *new_dentry) 222{ 223 return -EIO; 224} 225 226static int bad_inode_readlink(struct dentry *dentry, char __user *buffer, 227 int buflen) 228{ 229 return -EIO; 230} 231 232static int bad_inode_permission(struct inode *inode, int mask) 233{ 234 return -EIO; 235} 236 237static int bad_inode_getattr(struct vfsmount *mnt, struct dentry *dentry, 238 struct kstat *stat) 239{ 240 return -EIO; 241} 242 243static int bad_inode_setattr(struct dentry *direntry, struct iattr *attrs) 244{ 245 return -EIO; 246} 247 248static int bad_inode_setxattr(struct dentry *dentry, const char *name, 249 const void *value, size_t size, int flags) 250{ 251 return -EIO; 252} 253 254static ssize_t bad_inode_getxattr(struct dentry *dentry, const char *name, 255 void *buffer, size_t size) 256{ 257 return -EIO; 258} 259 260static ssize_t bad_inode_listxattr(struct dentry *dentry, char *buffer, 261 size_t buffer_size) 262{ 263 return -EIO; 264} 265 266static int bad_inode_removexattr(struct dentry *dentry, const char *name) 267{ 268 return -EIO; 269} 270 271static const struct inode_operations bad_inode_ops = 272{ 273 .create = bad_inode_create, 274 .lookup = bad_inode_lookup, 275 .link = bad_inode_link, 276 .unlink = bad_inode_unlink, 277 .symlink = bad_inode_symlink, 278 .mkdir = bad_inode_mkdir, 279 .rmdir = bad_inode_rmdir, 280 .mknod = bad_inode_mknod, 281 .rename = bad_inode_rename, 282 .readlink = bad_inode_readlink, 283 /* follow_link must be no-op, otherwise unmounting this inode 284 won't work */ 285 /* put_link returns void */ 286 /* truncate returns void */ 287 .permission = bad_inode_permission, 288 .getattr = bad_inode_getattr, 289 .setattr = bad_inode_setattr, 290 .setxattr = bad_inode_setxattr, 291 .getxattr = bad_inode_getxattr, 292 .listxattr = bad_inode_listxattr, 293 .removexattr = bad_inode_removexattr, 294 /* truncate_range returns void */ 295}; 296 297 298/* 299 * When a filesystem is unable to read an inode due to an I/O error in 300 * its read_inode() function, it can call make_bad_inode() to return a 301 * set of stubs which will return EIO errors as required. 302 * 303 * We only need to do limited initialisation: all other fields are 304 * preinitialised to zero automatically. 305 */ 306 307/** 308 * make_bad_inode - mark an inode bad due to an I/O error 309 * @inode: Inode to mark bad 310 * 311 * When an inode cannot be read due to a media or remote network 312 * failure this function makes the inode "bad" and causes I/O operations 313 * on it to fail from this point on. 314 */ 315 316void make_bad_inode(struct inode *inode) 317{ 318 remove_inode_hash(inode); 319 320 inode->i_mode = S_IFREG; 321 inode->i_atime = inode->i_mtime = inode->i_ctime = 322 current_fs_time(inode->i_sb); 323 inode->i_op = &bad_inode_ops; 324 inode->i_fop = &bad_file_ops; 325} 326EXPORT_SYMBOL(make_bad_inode); 327 328/* 329 * This tests whether an inode has been flagged as bad. The test uses 330 * &bad_inode_ops to cover the case of invalidated inodes as well as 331 * those created by make_bad_inode() above. 332 */ 333 334/** 335 * is_bad_inode - is an inode errored 336 * @inode: inode to test 337 * 338 * Returns true if the inode in question has been marked as bad. 339 */ 340 341int is_bad_inode(struct inode *inode) 342{ 343 return (inode->i_op == &bad_inode_ops); 344} 345 346EXPORT_SYMBOL(is_bad_inode); 347 348/** 349 * iget_failed - Mark an under-construction inode as dead and release it 350 * @inode: The inode to discard 351 * 352 * Mark an under-construction inode as dead and release it. 353 */ 354void iget_failed(struct inode *inode) 355{ 356 make_bad_inode(inode); 357 unlock_new_inode(inode); 358 iput(inode); 359} 360EXPORT_SYMBOL(iget_failed); 361