Line data Source code
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 0 : static int bad_file_open(struct inode *inode, struct file *filp)
21 : {
22 0 : return -EIO;
23 : }
24 :
25 : static const struct file_operations bad_file_ops =
26 : {
27 : .open = bad_file_open,
28 : };
29 :
30 0 : static int bad_inode_create(struct user_namespace *mnt_userns,
31 : struct inode *dir, struct dentry *dentry,
32 : umode_t mode, bool excl)
33 : {
34 0 : return -EIO;
35 : }
36 :
37 0 : static struct dentry *bad_inode_lookup(struct inode *dir,
38 : struct dentry *dentry, unsigned int flags)
39 : {
40 0 : return ERR_PTR(-EIO);
41 : }
42 :
43 0 : static int bad_inode_link (struct dentry *old_dentry, struct inode *dir,
44 : struct dentry *dentry)
45 : {
46 0 : return -EIO;
47 : }
48 :
49 0 : static int bad_inode_unlink(struct inode *dir, struct dentry *dentry)
50 : {
51 0 : return -EIO;
52 : }
53 :
54 0 : static int bad_inode_symlink(struct user_namespace *mnt_userns,
55 : struct inode *dir, struct dentry *dentry,
56 : const char *symname)
57 : {
58 0 : return -EIO;
59 : }
60 :
61 0 : static int bad_inode_mkdir(struct user_namespace *mnt_userns, struct inode *dir,
62 : struct dentry *dentry, umode_t mode)
63 : {
64 0 : return -EIO;
65 : }
66 :
67 0 : static int bad_inode_rmdir (struct inode *dir, struct dentry *dentry)
68 : {
69 0 : return -EIO;
70 : }
71 :
72 0 : static int bad_inode_mknod(struct user_namespace *mnt_userns, struct inode *dir,
73 : struct dentry *dentry, umode_t mode, dev_t rdev)
74 : {
75 0 : return -EIO;
76 : }
77 :
78 0 : 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,
81 : unsigned int flags)
82 : {
83 0 : return -EIO;
84 : }
85 :
86 0 : static int bad_inode_readlink(struct dentry *dentry, char __user *buffer,
87 : int buflen)
88 : {
89 0 : return -EIO;
90 : }
91 :
92 0 : static int bad_inode_permission(struct user_namespace *mnt_userns,
93 : struct inode *inode, int mask)
94 : {
95 0 : return -EIO;
96 : }
97 :
98 0 : 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)
101 : {
102 0 : return -EIO;
103 : }
104 :
105 0 : static int bad_inode_setattr(struct user_namespace *mnt_userns,
106 : struct dentry *direntry, struct iattr *attrs)
107 : {
108 0 : return -EIO;
109 : }
110 :
111 0 : static ssize_t bad_inode_listxattr(struct dentry *dentry, char *buffer,
112 : size_t buffer_size)
113 : {
114 0 : return -EIO;
115 : }
116 :
117 0 : static const char *bad_inode_get_link(struct dentry *dentry,
118 : struct inode *inode,
119 : struct delayed_call *done)
120 : {
121 0 : return ERR_PTR(-EIO);
122 : }
123 :
124 0 : static struct posix_acl *bad_inode_get_acl(struct inode *inode, int type)
125 : {
126 0 : return ERR_PTR(-EIO);
127 : }
128 :
129 0 : static int bad_inode_fiemap(struct inode *inode,
130 : struct fiemap_extent_info *fieinfo, u64 start,
131 : u64 len)
132 : {
133 0 : return -EIO;
134 : }
135 :
136 0 : static int bad_inode_update_time(struct inode *inode, struct timespec64 *time,
137 : int flags)
138 : {
139 0 : return -EIO;
140 : }
141 :
142 0 : static 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 0 : return -EIO;
147 : }
148 :
149 0 : static int bad_inode_tmpfile(struct user_namespace *mnt_userns,
150 : struct inode *inode, struct dentry *dentry,
151 : umode_t mode)
152 : {
153 0 : return -EIO;
154 : }
155 :
156 0 : static int bad_inode_set_acl(struct user_namespace *mnt_userns,
157 : struct inode *inode, struct posix_acl *acl,
158 : int type)
159 : {
160 0 : return -EIO;
161 : }
162 :
163 : static 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_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 :
207 0 : void make_bad_inode(struct inode *inode)
208 : {
209 0 : remove_inode_hash(inode);
210 :
211 0 : inode->i_mode = S_IFREG;
212 0 : inode->i_atime = inode->i_mtime = inode->i_ctime =
213 0 : current_time(inode);
214 0 : inode->i_op = &bad_inode_ops;
215 0 : inode->i_opflags &= ~IOP_XATTR;
216 0 : inode->i_fop = &bad_file_ops;
217 0 : }
218 : EXPORT_SYMBOL(make_bad_inode);
219 :
220 : /*
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.
224 : */
225 :
226 : /**
227 : * is_bad_inode - is an inode errored
228 : * @inode: inode to test
229 : *
230 : * Returns true if the inode in question has been marked as bad.
231 : */
232 :
233 1905 : bool is_bad_inode(struct inode *inode)
234 : {
235 1905 : return (inode->i_op == &bad_inode_ops);
236 : }
237 :
238 : EXPORT_SYMBOL(is_bad_inode);
239 :
240 : /**
241 : * iget_failed - Mark an under-construction inode as dead and release it
242 : * @inode: The inode to discard
243 : *
244 : * Mark an under-construction inode as dead and release it.
245 : */
246 0 : void iget_failed(struct inode *inode)
247 : {
248 0 : make_bad_inode(inode);
249 0 : unlock_new_inode(inode);
250 0 : iput(inode);
251 0 : }
252 : EXPORT_SYMBOL(iget_failed);
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