ia64/linux-2.6.18-xen.hg

view fs/bad_inode.c @ 524:7f8b544237bf

netfront: Allow netfront in domain 0.

This is useful if your physical network device is in a utility domain.

Signed-off-by: Ian Campbell <ian.campbell@citrix.com>
author Keir Fraser <keir.fraser@citrix.com>
date Tue Apr 15 15:18:58 2008 +0100 (2008-04-15)
parents 831230e53067
children
line source
1 /*
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 */
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>
18 static int return_EIO(void)
19 {
20 return -EIO;
21 }
23 #define EIO_ERROR ((void *) (return_EIO))
25 static const struct file_operations bad_file_ops =
26 {
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 };
50 static struct inode_operations bad_inode_ops =
51 {
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 };
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 */
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 */
93 void make_bad_inode(struct inode * inode)
94 {
95 remove_inode_hash(inode);
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 }
103 EXPORT_SYMBOL(make_bad_inode);
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 */
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 */
118 int is_bad_inode(struct inode * inode)
119 {
120 return (inode->i_op == &bad_inode_ops);
121 }
123 EXPORT_SYMBOL(is_bad_inode);