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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(const struct mnt_idmap *idmap,
31 struct inode *dir, struct dentry *dentry,
32 umode_t mode)
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(const struct mnt_idmap *idmap,
55 struct inode *dir, struct dentry *dentry,
56 const char *symname)
57{
58 return -EIO;
59}
60
61static struct dentry *bad_inode_mkdir(const struct mnt_idmap *idmap, struct inode *dir,
62 struct dentry *dentry, umode_t mode)
63{
64 return ERR_PTR(-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(const 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(const 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(const struct mnt_idmap *idmap,
93 struct inode *inode, int mask)
94{
95 return -EIO;
96}
97
98static int bad_inode_getattr(const 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(const 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, enum fs_update_time type,
137 unsigned int flags)
138{
139 return -EIO;
140}
141
142static int bad_inode_atomic_open(struct inode *inode, struct dentry *dentry,
143 struct file *file, unsigned int open_flag,
144 umode_t create_mode)
145{
146 return -EIO;
147}
148
149static int bad_inode_tmpfile(const struct mnt_idmap *idmap,
150 struct inode *inode, struct file *file,
151 umode_t mode)
152{
153 return -EIO;
154}
155
156static int bad_inode_set_acl(const struct mnt_idmap *idmap,
157 struct dentry *dentry, struct posix_acl *acl,
158 int type)
159{
160 return -EIO;
161}
162
163static const struct inode_operations bad_inode_ops =
164{
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_inode_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,
186};
187
188
189/*
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.
193 *
194 * We only need to do limited initialisation: all other fields are
195 * preinitialised to zero automatically.
196 */
197
198/**
199 * make_bad_inode - mark an inode bad due to an I/O error
200 * @inode: Inode to mark bad
201 *
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.
205 */
206
207void make_bad_inode(struct inode *inode)
208{
209 remove_inode_hash(inode);
210
211 inode->i_mode = S_IFREG;
212 simple_inode_init_ts(inode);
213 inode->i_op = &bad_inode_ops;
214 inode->i_opflags &= ~IOP_XATTR;
215 inode->i_fop = &bad_file_ops;
216}
217EXPORT_SYMBOL(make_bad_inode);
218
219/*
220 * This tests whether an inode has been flagged as bad. The test uses
221 * &bad_inode_ops to cover the case of invalidated inodes as well as
222 * those created by make_bad_inode() above.
223 */
224
225/**
226 * is_bad_inode - is an inode errored
227 * @inode: inode to test
228 *
229 * Returns true if the inode in question has been marked as bad.
230 */
231
232bool is_bad_inode(struct inode *inode)
233{
234 return (inode->i_op == &bad_inode_ops);
235}
236
237EXPORT_SYMBOL(is_bad_inode);
238
239/**
240 * iget_failed - Mark an under-construction inode as dead and release it
241 * @inode: The inode to discard
242 *
243 * Mark an under-construction inode as dead and release it.
244 */
245void iget_failed(struct inode *inode)
246{
247 make_bad_inode(inode);
248 unlock_new_inode(inode);
249 iput(inode);
250}
251EXPORT_SYMBOL(iget_failed);