blob: 80599ae339669d3a3a962d64d974f62fb30a58d6 [file] [log] [blame]
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>
12#include <linux/module.h>
13#include <linux/stat.h>
14#include <linux/time.h>
15#include <linux/smp_lock.h>
16#include <linux/namei.h>
17
18static int return_EIO(void)
19{
20 return -EIO;
21}
22
23#define EIO_ERROR ((void *) (return_EIO))
24
Arjan van de Ven4b6f5d22006-03-28 01:56:42 -080025static const struct file_operations bad_file_ops =
Linus Torvalds1da177e2005-04-16 15:20:36 -070026{
27 .llseek = EIO_ERROR,
28 .aio_read = EIO_ERROR,
29 .read = EIO_ERROR,
30 .write = EIO_ERROR,
31 .aio_write = EIO_ERROR,
32 .readdir = EIO_ERROR,
33 .poll = EIO_ERROR,
34 .ioctl = EIO_ERROR,
35 .mmap = EIO_ERROR,
36 .open = EIO_ERROR,
37 .flush = EIO_ERROR,
38 .release = EIO_ERROR,
39 .fsync = EIO_ERROR,
40 .aio_fsync = EIO_ERROR,
41 .fasync = EIO_ERROR,
42 .lock = EIO_ERROR,
43 .readv = EIO_ERROR,
44 .writev = EIO_ERROR,
45 .sendfile = EIO_ERROR,
46 .sendpage = EIO_ERROR,
47 .get_unmapped_area = EIO_ERROR,
48};
49
Adrian Bunk75c96f82005-05-05 16:16:09 -070050static struct inode_operations bad_inode_ops =
Linus Torvalds1da177e2005-04-16 15:20:36 -070051{
52 .create = EIO_ERROR,
53 .lookup = EIO_ERROR,
54 .link = EIO_ERROR,
55 .unlink = EIO_ERROR,
56 .symlink = EIO_ERROR,
57 .mkdir = EIO_ERROR,
58 .rmdir = EIO_ERROR,
59 .mknod = EIO_ERROR,
60 .rename = EIO_ERROR,
61 .readlink = EIO_ERROR,
62 /* follow_link must be no-op, otherwise unmounting this inode
63 won't work */
64 .truncate = EIO_ERROR,
65 .permission = EIO_ERROR,
66 .getattr = EIO_ERROR,
67 .setattr = EIO_ERROR,
68 .setxattr = EIO_ERROR,
69 .getxattr = EIO_ERROR,
70 .listxattr = EIO_ERROR,
71 .removexattr = EIO_ERROR,
72};
73
74
75/*
76 * When a filesystem is unable to read an inode due to an I/O error in
77 * its read_inode() function, it can call make_bad_inode() to return a
78 * set of stubs which will return EIO errors as required.
79 *
80 * We only need to do limited initialisation: all other fields are
81 * preinitialised to zero automatically.
82 */
83
84/**
85 * make_bad_inode - mark an inode bad due to an I/O error
86 * @inode: Inode to mark bad
87 *
88 * When an inode cannot be read due to a media or remote network
89 * failure this function makes the inode "bad" and causes I/O operations
90 * on it to fail from this point on.
91 */
92
93void make_bad_inode(struct inode * inode)
94{
95 remove_inode_hash(inode);
96
97 inode->i_mode = S_IFREG;
98 inode->i_atime = inode->i_mtime = inode->i_ctime =
99 current_fs_time(inode->i_sb);
100 inode->i_op = &bad_inode_ops;
101 inode->i_fop = &bad_file_ops;
102}
103EXPORT_SYMBOL(make_bad_inode);
104
105/*
106 * This tests whether an inode has been flagged as bad. The test uses
107 * &bad_inode_ops to cover the case of invalidated inodes as well as
108 * those created by make_bad_inode() above.
109 */
110
111/**
112 * is_bad_inode - is an inode errored
113 * @inode: inode to test
114 *
115 * Returns true if the inode in question has been marked as bad.
116 */
117
118int is_bad_inode(struct inode * inode)
119{
120 return (inode->i_op == &bad_inode_ops);
121}
122
123EXPORT_SYMBOL(is_bad_inode);