4 * Copyright (C) 1997, Stephen Tweedie
6 * Provide stub functions for unreadable inodes
8 * Fabian Frederick : August 2003 - All file operations assigned to EIO
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)
23 #define EIO_ERROR ((void *) (return_EIO))
25 static struct file_operations bad_file_ops =
28 .aio_read = EIO_ERROR,
31 .aio_write = EIO_ERROR,
40 .aio_fsync = EIO_ERROR,
45 .sendfile = EIO_ERROR,
46 .sendpage = EIO_ERROR,
47 .get_unmapped_area = EIO_ERROR,
50 struct inode_operations bad_inode_ops =
61 .readlink = EIO_ERROR,
62 /* follow_link must be no-op, otherwise unmounting this inode
64 .truncate = EIO_ERROR,
65 .permission = EIO_ERROR,
68 .setxattr = EIO_ERROR,
69 .getxattr = EIO_ERROR,
70 .listxattr = EIO_ERROR,
71 .removexattr = EIO_ERROR,
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.
80 * We only need to do limited initialisation: all other fields are
81 * preinitialised to zero automatically.
85 * make_bad_inode - mark an inode bad due to an I/O error
86 * @inode: Inode to mark bad
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.
93 void make_bad_inode(struct inode * inode)
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;
103 EXPORT_SYMBOL(make_bad_inode);
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.
112 * is_bad_inode - is an inode errored
113 * @inode: inode to test
115 * Returns true if the inode in question has been marked as bad.
118 int is_bad_inode(struct inode * inode)
120 return (inode->i_op == &bad_inode_ops);
123 EXPORT_SYMBOL(is_bad_inode);