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(error: -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(error: -EIO); |
122 | } |
123 | |
124 | static struct posix_acl *bad_inode_get_acl(struct inode *inode, int type, bool rcu) |
125 | { |
126 | return ERR_PTR(error: -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 | |