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1// SPDX-License-Identifier: GPL-2.02/*3 * linux/fs/bad_inode.c4 *5 * Copyright (C) 1997, Stephen Tweedie6 *7 * Provide stub functions for unreadable inodes8 *9 * Fabian Frederick : August 2003 - All file operations assigned to EIO10 */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 in190 * its read_inode() function, it can call make_bad_inode() to return a191 * set of stubs which will return EIO errors as required. 192 *193 * We only need to do limited initialisation: all other fields are194 * preinitialised to zero automatically.195 */196 197/**198 * make_bad_inode - mark an inode bad due to an I/O error199 * @inode: Inode to mark bad200 *201 * When an inode cannot be read due to a media or remote network202 * failure this function makes the inode "bad" and causes I/O operations203 * 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 uses220 * &bad_inode_ops to cover the case of invalidated inodes as well as221 * those created by make_bad_inode() above.222 */223 224/**225 * is_bad_inode - is an inode errored226 * @inode: inode to test227 *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 it240 * @inode: The inode to discard241 *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