1// SPDX-License-Identifier: GPL-2.0 2/* 3 * linux/fs/bad_inode.c 4 * 5 * Copyright (C) 1997, Stephen Tweedie 6 * 7 * Provide stub functions for unreadable inodes 8 * 9 * Fabian Frederick : August 2003 - All file operations assigned to EIO 10 */ 11 12#include <linux/fs.h> 13#include <linux/export.h> 14#include <linux/stat.h> 15#include <linux/time.h> 16#include <linux/namei.h> 17#include <linux/poll.h> 18#include <linux/fiemap.h> 19 20static int bad_file_open(struct inode *inode, struct file *filp) 21{ 22 return -EIO; 23} 24 25static const struct file_operations bad_file_ops = 26{ 27 .open = bad_file_open, 28}; 29 30static int bad_inode_create(struct mnt_idmap *idmap, 31 struct inode *dir, struct dentry *dentry, 32 umode_t mode, bool excl) 33{ 34 return -EIO; 35} 36 37static struct dentry *bad_inode_lookup(struct inode *dir, 38 struct dentry *dentry, unsigned int flags) 39{ 40 return ERR_PTR(-EIO); 41} 42 43static int bad_inode_link (struct dentry *old_dentry, struct inode *dir, 44 struct dentry *dentry) 45{ 46 return -EIO; 47} 48 49static int bad_inode_unlink(struct inode *dir, struct dentry *dentry) 50{ 51 return -EIO; 52} 53 54static int bad_inode_symlink(struct mnt_idmap *idmap, 55 struct inode *dir, struct dentry *dentry, 56 const char *symname) 57{ 58 return -EIO; 59} 60 61static int bad_inode_mkdir(struct mnt_idmap *idmap, struct inode *dir, 62 struct dentry *dentry, umode_t mode) 63{ 64 return -EIO; 65} 66 67static int bad_inode_rmdir (struct inode *dir, struct dentry *dentry) 68{ 69 return -EIO; 70} 71 72static int bad_inode_mknod(struct mnt_idmap *idmap, struct inode *dir, 73 struct dentry *dentry, umode_t mode, dev_t rdev) 74{ 75 return -EIO; 76} 77 78static int bad_inode_rename2(struct mnt_idmap *idmap, 79 struct inode *old_dir, struct dentry *old_dentry, 80 struct inode *new_dir, struct dentry *new_dentry, 81 unsigned int flags) 82{ 83 return -EIO; 84} 85 86static int bad_inode_readlink(struct dentry *dentry, char __user *buffer, 87 int buflen) 88{ 89 return -EIO; 90} 91 92static int bad_inode_permission(struct mnt_idmap *idmap, 93 struct inode *inode, int mask) 94{ 95 return -EIO; 96} 97 98static int bad_inode_getattr(struct mnt_idmap *idmap, 99 const struct path *path, struct kstat *stat, 100 u32 request_mask, unsigned int query_flags) 101{ 102 return -EIO; 103} 104 105static int bad_inode_setattr(struct mnt_idmap *idmap, 106 struct dentry *direntry, struct iattr *attrs) 107{ 108 return -EIO; 109} 110 111static ssize_t bad_inode_listxattr(struct dentry *dentry, char *buffer, 112 size_t buffer_size) 113{ 114 return -EIO; 115} 116 117static const char *bad_inode_get_link(struct dentry *dentry, 118 struct inode *inode, 119 struct delayed_call *done) 120{ 121 return ERR_PTR(-EIO); 122} 123 124static struct posix_acl *bad_inode_get_acl(struct inode *inode, int type, bool rcu) 125{ 126 return ERR_PTR(-EIO); 127} 128 129static int bad_inode_fiemap(struct inode *inode, 130 struct fiemap_extent_info *fieinfo, u64 start, 131 u64 len) 132{ 133 return -EIO; 134} 135 136static int bad_inode_update_time(struct inode *inode, int flags) 137{ 138 return -EIO; 139} 140 141static int bad_inode_atomic_open(struct inode *inode, struct dentry *dentry, 142 struct file *file, unsigned int open_flag, 143 umode_t create_mode) 144{ 145 return -EIO; 146} 147 148static int bad_inode_tmpfile(struct mnt_idmap *idmap, 149 struct inode *inode, struct file *file, 150 umode_t mode) 151{ 152 return -EIO; 153} 154 155static int bad_inode_set_acl(struct mnt_idmap *idmap, 156 struct dentry *dentry, struct posix_acl *acl, 157 int type) 158{ 159 return -EIO; 160} 161 162static const struct inode_operations bad_inode_ops = 163{ 164 .create = bad_inode_create, 165 .lookup = bad_inode_lookup, 166 .link = bad_inode_link, 167 .unlink = bad_inode_unlink, 168 .symlink = bad_inode_symlink, 169 .mkdir = bad_inode_mkdir, 170 .rmdir = bad_inode_rmdir, 171 .mknod = bad_inode_mknod, 172 .rename = bad_inode_rename2, 173 .readlink = bad_inode_readlink, 174 .permission = bad_inode_permission, 175 .getattr = bad_inode_getattr, 176 .setattr = bad_inode_setattr, 177 .listxattr = bad_inode_listxattr, 178 .get_link = bad_inode_get_link, 179 .get_inode_acl = bad_inode_get_acl, 180 .fiemap = bad_inode_fiemap, 181 .update_time = bad_inode_update_time, 182 .atomic_open = bad_inode_atomic_open, 183 .tmpfile = bad_inode_tmpfile, 184 .set_acl = bad_inode_set_acl, 185}; 186 187 188/* 189 * When a filesystem is unable to read an inode due to an I/O error in 190 * its read_inode() function, it can call make_bad_inode() to return a 191 * set of stubs which will return EIO errors as required. 192 * 193 * We only need to do limited initialisation: all other fields are 194 * preinitialised to zero automatically. 195 */ 196 197/** 198 * make_bad_inode - mark an inode bad due to an I/O error 199 * @inode: Inode to mark bad 200 * 201 * When an inode cannot be read due to a media or remote network 202 * failure this function makes the inode "bad" and causes I/O operations 203 * on it to fail from this point on. 204 */ 205 206void make_bad_inode(struct inode *inode) 207{ 208 remove_inode_hash(inode); 209 210 inode->i_mode = S_IFREG; 211 simple_inode_init_ts(inode); 212 inode->i_op = &bad_inode_ops; 213 inode->i_opflags &= ~IOP_XATTR; 214 inode->i_fop = &bad_file_ops; 215} 216EXPORT_SYMBOL(make_bad_inode); 217 218/* 219 * This tests whether an inode has been flagged as bad. The test uses 220 * &bad_inode_ops to cover the case of invalidated inodes as well as 221 * those created by make_bad_inode() above. 222 */ 223 224/** 225 * is_bad_inode - is an inode errored 226 * @inode: inode to test 227 * 228 * Returns true if the inode in question has been marked as bad. 229 */ 230 231bool is_bad_inode(struct inode *inode) 232{ 233 return (inode->i_op == &bad_inode_ops); 234} 235 236EXPORT_SYMBOL(is_bad_inode); 237 238/** 239 * iget_failed - Mark an under-construction inode as dead and release it 240 * @inode: The inode to discard 241 * 242 * Mark an under-construction inode as dead and release it. 243 */ 244void iget_failed(struct inode *inode) 245{ 246 make_bad_inode(inode); 247 unlock_new_inode(inode); 248 iput(inode); 249} 250EXPORT_SYMBOL(iget_failed); 251