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Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
2 * linux/fs/bad_inode.c
3 *
4 * Copyright (C) 1997, Stephen Tweedie
5 *
6 * Provide stub functions for unreadable inodes
7 *
8 * Fabian Frederick : August 2003 - All file operations assigned to EIO
9 */
10
11#include <linux/fs.h>
Paul Gortmaker630d9c42011-11-16 23:57:37 -050012#include <linux/export.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070013#include <linux/stat.h>
14#include <linux/time.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070015#include <linux/namei.h>
Eric Sandeenbe6aab02007-01-05 16:36:36 -080016#include <linux/poll.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070017
Eric Sandeenbe6aab02007-01-05 16:36:36 -080018static int bad_file_open(struct inode *inode, struct file *filp)
19{
20 return -EIO;
21}
22
Arjan van de Ven4b6f5d22006-03-28 01:56:42 -080023static const struct file_operations bad_file_ops =
Linus Torvalds1da177e2005-04-16 15:20:36 -070024{
Eric Sandeenbe6aab02007-01-05 16:36:36 -080025 .open = bad_file_open,
Linus Torvalds1da177e2005-04-16 15:20:36 -070026};
27
Eric Sandeenbe6aab02007-01-05 16:36:36 -080028static int bad_inode_create (struct inode *dir, struct dentry *dentry,
Al Viroebfc3b42012-06-10 18:05:36 -040029 umode_t mode, bool excl)
Eric Sandeenbe6aab02007-01-05 16:36:36 -080030{
31 return -EIO;
32}
33
34static struct dentry *bad_inode_lookup(struct inode *dir,
Al Viro00cd8dd2012-06-10 17:13:09 -040035 struct dentry *dentry, unsigned int flags)
Eric Sandeenbe6aab02007-01-05 16:36:36 -080036{
37 return ERR_PTR(-EIO);
38}
39
40static int bad_inode_link (struct dentry *old_dentry, struct inode *dir,
41 struct dentry *dentry)
42{
43 return -EIO;
44}
45
46static int bad_inode_unlink(struct inode *dir, struct dentry *dentry)
47{
48 return -EIO;
49}
50
51static int bad_inode_symlink (struct inode *dir, struct dentry *dentry,
52 const char *symname)
53{
54 return -EIO;
55}
56
57static int bad_inode_mkdir(struct inode *dir, struct dentry *dentry,
Al Viro18bb1db2011-07-26 01:41:39 -040058 umode_t mode)
Eric Sandeenbe6aab02007-01-05 16:36:36 -080059{
60 return -EIO;
61}
62
63static int bad_inode_rmdir (struct inode *dir, struct dentry *dentry)
64{
65 return -EIO;
66}
67
68static int bad_inode_mknod (struct inode *dir, struct dentry *dentry,
Al Viro1a67aaf2011-07-26 01:52:52 -040069 umode_t mode, dev_t rdev)
Eric Sandeenbe6aab02007-01-05 16:36:36 -080070{
71 return -EIO;
72}
73
Miklos Szeredia0dbc562014-07-23 15:15:31 +020074static int bad_inode_rename2(struct inode *old_dir, struct dentry *old_dentry,
75 struct inode *new_dir, struct dentry *new_dentry,
76 unsigned int flags)
Eric Sandeenbe6aab02007-01-05 16:36:36 -080077{
78 return -EIO;
79}
80
81static int bad_inode_readlink(struct dentry *dentry, char __user *buffer,
82 int buflen)
83{
84 return -EIO;
85}
86
Al Viro10556cb2011-06-20 19:28:19 -040087static int bad_inode_permission(struct inode *inode, int mask)
Eric Sandeenbe6aab02007-01-05 16:36:36 -080088{
89 return -EIO;
90}
91
92static int bad_inode_getattr(struct vfsmount *mnt, struct dentry *dentry,
93 struct kstat *stat)
94{
95 return -EIO;
96}
97
98static int bad_inode_setattr(struct dentry *direntry, struct iattr *attrs)
99{
100 return -EIO;
101}
102
Al Viro3767e252016-05-27 11:06:05 -0400103static int bad_inode_setxattr(struct dentry *dentry, struct inode *inode,
104 const char *name, const void *value, size_t size, int flags)
Eric Sandeenbe6aab02007-01-05 16:36:36 -0800105{
106 return -EIO;
107}
108
Al Viroce23e642016-04-11 00:48:00 -0400109static ssize_t bad_inode_getxattr(struct dentry *dentry, struct inode *inode,
110 const char *name, void *buffer, size_t size)
Eric Sandeenbe6aab02007-01-05 16:36:36 -0800111{
112 return -EIO;
113}
114
115static ssize_t bad_inode_listxattr(struct dentry *dentry, char *buffer,
116 size_t buffer_size)
117{
118 return -EIO;
119}
120
121static int bad_inode_removexattr(struct dentry *dentry, const char *name)
122{
123 return -EIO;
124}
125
Arjan van de Ven754661f2007-02-12 00:55:38 -0800126static const struct inode_operations bad_inode_ops =
Linus Torvalds1da177e2005-04-16 15:20:36 -0700127{
Eric Sandeenbe6aab02007-01-05 16:36:36 -0800128 .create = bad_inode_create,
129 .lookup = bad_inode_lookup,
130 .link = bad_inode_link,
131 .unlink = bad_inode_unlink,
132 .symlink = bad_inode_symlink,
133 .mkdir = bad_inode_mkdir,
134 .rmdir = bad_inode_rmdir,
135 .mknod = bad_inode_mknod,
Miklos Szeredia0dbc562014-07-23 15:15:31 +0200136 .rename2 = bad_inode_rename2,
Eric Sandeenbe6aab02007-01-05 16:36:36 -0800137 .readlink = bad_inode_readlink,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700138 /* follow_link must be no-op, otherwise unmounting this inode
139 won't work */
Eric Sandeenbe6aab02007-01-05 16:36:36 -0800140 /* put_link returns void */
141 /* truncate returns void */
142 .permission = bad_inode_permission,
143 .getattr = bad_inode_getattr,
144 .setattr = bad_inode_setattr,
145 .setxattr = bad_inode_setxattr,
146 .getxattr = bad_inode_getxattr,
147 .listxattr = bad_inode_listxattr,
148 .removexattr = bad_inode_removexattr,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700149};
150
151
152/*
153 * When a filesystem is unable to read an inode due to an I/O error in
154 * its read_inode() function, it can call make_bad_inode() to return a
155 * set of stubs which will return EIO errors as required.
156 *
157 * We only need to do limited initialisation: all other fields are
158 * preinitialised to zero automatically.
159 */
160
161/**
162 * make_bad_inode - mark an inode bad due to an I/O error
163 * @inode: Inode to mark bad
164 *
165 * When an inode cannot be read due to a media or remote network
166 * failure this function makes the inode "bad" and causes I/O operations
167 * on it to fail from this point on.
168 */
169
Eric Sandeenbe6aab02007-01-05 16:36:36 -0800170void make_bad_inode(struct inode *inode)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700171{
172 remove_inode_hash(inode);
173
174 inode->i_mode = S_IFREG;
175 inode->i_atime = inode->i_mtime = inode->i_ctime =
176 current_fs_time(inode->i_sb);
177 inode->i_op = &bad_inode_ops;
178 inode->i_fop = &bad_file_ops;
179}
180EXPORT_SYMBOL(make_bad_inode);
181
182/*
183 * This tests whether an inode has been flagged as bad. The test uses
184 * &bad_inode_ops to cover the case of invalidated inodes as well as
185 * those created by make_bad_inode() above.
186 */
187
188/**
189 * is_bad_inode - is an inode errored
190 * @inode: inode to test
191 *
192 * Returns true if the inode in question has been marked as bad.
193 */
194
Yaowei Bai0e3ef1f2015-11-19 21:00:11 +0800195bool is_bad_inode(struct inode *inode)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700196{
197 return (inode->i_op == &bad_inode_ops);
198}
199
200EXPORT_SYMBOL(is_bad_inode);
David Howellsb46980f2008-02-07 00:15:27 -0800201
202/**
203 * iget_failed - Mark an under-construction inode as dead and release it
204 * @inode: The inode to discard
205 *
206 * Mark an under-construction inode as dead and release it.
207 */
208void iget_failed(struct inode *inode)
209{
210 make_bad_inode(inode);
211 unlock_new_inode(inode);
212 iput(inode);
213}
214EXPORT_SYMBOL(iget_failed);