1 // SPDX-License-Identifier: GPL-2.0
5 * Copyright (C) 1997, Stephen Tweedie
7 * Provide stub functions for unreadable inodes
9 * Fabian Frederick : August 2003 - All file operations assigned to EIO
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>
20 static int bad_file_open(struct inode *inode, struct file *filp)
25 static const struct file_operations bad_file_ops =
27 .open = bad_file_open,
30 static int bad_inode_create(struct user_namespace *mnt_userns,
31 struct inode *dir, struct dentry *dentry,
32 umode_t mode, bool excl)
37 static struct dentry *bad_inode_lookup(struct inode *dir,
38 struct dentry *dentry, unsigned int flags)
43 static int bad_inode_link (struct dentry *old_dentry, struct inode *dir,
44 struct dentry *dentry)
49 static int bad_inode_unlink(struct inode *dir, struct dentry *dentry)
54 static int bad_inode_symlink(struct user_namespace *mnt_userns,
55 struct inode *dir, struct dentry *dentry,
61 static int bad_inode_mkdir(struct user_namespace *mnt_userns, struct inode *dir,
62 struct dentry *dentry, umode_t mode)
67 static int bad_inode_rmdir (struct inode *dir, struct dentry *dentry)
72 static int bad_inode_mknod(struct user_namespace *mnt_userns, struct inode *dir,
73 struct dentry *dentry, umode_t mode, dev_t rdev)
78 static int bad_inode_rename2(struct user_namespace *mnt_userns,
79 struct inode *old_dir, struct dentry *old_dentry,
80 struct inode *new_dir, struct dentry *new_dentry,
86 static int bad_inode_readlink(struct dentry *dentry, char __user *buffer,
92 static int bad_inode_permission(struct user_namespace *mnt_userns,
93 struct inode *inode, int mask)
98 static int bad_inode_getattr(struct user_namespace *mnt_userns,
99 const struct path *path, struct kstat *stat,
100 u32 request_mask, unsigned int query_flags)
105 static int bad_inode_setattr(struct user_namespace *mnt_userns,
106 struct dentry *direntry, struct iattr *attrs)
111 static ssize_t bad_inode_listxattr(struct dentry *dentry, char *buffer,
117 static const char *bad_inode_get_link(struct dentry *dentry,
119 struct delayed_call *done)
121 return ERR_PTR(-EIO);
124 static struct posix_acl *bad_inode_get_acl(struct inode *inode, int type)
126 return ERR_PTR(-EIO);
129 static int bad_inode_fiemap(struct inode *inode,
130 struct fiemap_extent_info *fieinfo, u64 start,
136 static int bad_inode_update_time(struct inode *inode, struct timespec64 *time,
142 static int bad_inode_atomic_open(struct inode *inode, struct dentry *dentry,
143 struct file *file, unsigned int open_flag,
149 static int bad_inode_tmpfile(struct user_namespace *mnt_userns,
150 struct inode *inode, struct dentry *dentry,
156 static int bad_inode_set_acl(struct user_namespace *mnt_userns,
157 struct inode *inode, struct posix_acl *acl,
163 static const struct inode_operations bad_inode_ops =
165 .create = bad_inode_create,
166 .lookup = bad_inode_lookup,
167 .link = bad_inode_link,
168 .unlink = bad_inode_unlink,
169 .symlink = bad_inode_symlink,
170 .mkdir = bad_inode_mkdir,
171 .rmdir = bad_inode_rmdir,
172 .mknod = bad_inode_mknod,
173 .rename = bad_inode_rename2,
174 .readlink = bad_inode_readlink,
175 .permission = bad_inode_permission,
176 .getattr = bad_inode_getattr,
177 .setattr = bad_inode_setattr,
178 .listxattr = bad_inode_listxattr,
179 .get_link = bad_inode_get_link,
180 .get_acl = bad_inode_get_acl,
181 .fiemap = bad_inode_fiemap,
182 .update_time = bad_inode_update_time,
183 .atomic_open = bad_inode_atomic_open,
184 .tmpfile = bad_inode_tmpfile,
185 .set_acl = bad_inode_set_acl,
190 * When a filesystem is unable to read an inode due to an I/O error in
191 * its read_inode() function, it can call make_bad_inode() to return a
192 * set of stubs which will return EIO errors as required.
194 * We only need to do limited initialisation: all other fields are
195 * preinitialised to zero automatically.
199 * make_bad_inode - mark an inode bad due to an I/O error
200 * @inode: Inode to mark bad
202 * When an inode cannot be read due to a media or remote network
203 * failure this function makes the inode "bad" and causes I/O operations
204 * on it to fail from this point on.
207 void make_bad_inode(struct inode *inode)
209 remove_inode_hash(inode);
211 inode->i_mode = S_IFREG;
212 inode->i_atime = inode->i_mtime = inode->i_ctime =
214 inode->i_op = &bad_inode_ops;
215 inode->i_opflags &= ~IOP_XATTR;
216 inode->i_fop = &bad_file_ops;
218 EXPORT_SYMBOL(make_bad_inode);
221 * This tests whether an inode has been flagged as bad. The test uses
222 * &bad_inode_ops to cover the case of invalidated inodes as well as
223 * those created by make_bad_inode() above.
227 * is_bad_inode - is an inode errored
228 * @inode: inode to test
230 * Returns true if the inode in question has been marked as bad.
233 bool is_bad_inode(struct inode *inode)
235 return (inode->i_op == &bad_inode_ops);
238 EXPORT_SYMBOL(is_bad_inode);
241 * iget_failed - Mark an under-construction inode as dead and release it
242 * @inode: The inode to discard
244 * Mark an under-construction inode as dead and release it.
246 void iget_failed(struct inode *inode)
248 make_bad_inode(inode);
249 unlock_new_inode(inode);
252 EXPORT_SYMBOL(iget_failed);