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
20 static int bad_file_open(struct inode *inode, struct file *filp)
21 {
22 return -EIO;
23 }
24
25 static const struct file_operations bad_file_ops =
26 {
27 .open = bad_file_open,
28 };
29
30 static 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
37 static struct dentry *bad_inode_lookup(struct inode *dir,
38 struct dentry *dentry, unsigned int flags)
39 {
40 return ERR_PTR(-EIO);
41 }
42
43 static int bad_inode_link (struct dentry *old_dentry, struct inode *dir,
44 struct dentry *dentry)
45 {
46 return -EIO;
47 }
48
49 static int bad_inode_unlink(struct inode *dir, struct dentry *dentry)
50 {
51 return -EIO;
52 }
53
54 static 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
61 static int bad_inode_mkdir(struct mnt_idmap *idmap, struct inode *dir,
62 struct dentry *dentry, umode_t mode)
63 {
64 return -EIO;
65 }
66
67 static int bad_inode_rmdir (struct inode *dir, struct dentry *dentry)
68 {
69 return -EIO;
70 }
71
72 static 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
78 static 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
86 static int bad_inode_readlink(struct dentry *dentry, char __user *buffer,
87 int buflen)
88 {
89 return -EIO;
90 }
91
92 static int bad_inode_permission(struct mnt_idmap *idmap,
93 struct inode *inode, int mask)
94 {
95 return -EIO;
96 }
97
98 static 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
105 static int bad_inode_setattr(struct mnt_idmap *idmap,
106 struct dentry *direntry, struct iattr *attrs)
107 {
108 return -EIO;
109 }
110
111 static ssize_t bad_inode_listxattr(struct dentry *dentry, char *buffer,
112 size_t buffer_size)
113 {
114 return -EIO;
115 }
116
117 static 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
124 static struct posix_acl *bad_inode_get_acl(struct inode *inode, int type, bool rcu)
125 {
126 return ERR_PTR(-EIO);
127 }
128
129 static int bad_inode_fiemap(struct inode *inode,
130 struct fiemap_extent_info *fieinfo, u64 start,
131 u64 len)
132 {
133 return -EIO;
134 }
135
136 static int bad_inode_update_time(struct inode *inode, int flags)
137 {
138 return -EIO;
139 }
140
141 static 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
148 static 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
155 static 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
162 static 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
206 void 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 }
216 EXPORT_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
231 bool is_bad_inode(struct inode *inode)
232 {
233 return (inode->i_op == &bad_inode_ops);
234 }
235
236 EXPORT_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 */
244 void iget_failed(struct inode *inode)
245 {
246 make_bad_inode(inode);
247 unlock_new_inode(inode);
248 iput(inode);
249 }
250 EXPORT_SYMBOL(iget_failed);
251
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