Root/fs/bad_inode.c

Source at commit 9845c1745d3d531a5b9544f5322c62bfb4d4e9bc created 1 year 2 months ago.
By Xiangfu, rtc: jz4740 fix hwclock give time out
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 */
10
11#include <linux/fs.h>
12#include <linux/module.h>
13#include <linux/stat.h>
14#include <linux/time.h>
15#include <linux/namei.h>
16#include <linux/poll.h>
17
18
19static loff_t bad_file_llseek(struct file *file, loff_t offset, int origin)
20{
21    return -EIO;
22}
23
24static ssize_t bad_file_read(struct file *filp, char __user *buf,
25            size_t size, loff_t *ppos)
26{
27        return -EIO;
28}
29
30static ssize_t bad_file_write(struct file *filp, const char __user *buf,
31            size_t siz, loff_t *ppos)
32{
33        return -EIO;
34}
35
36static ssize_t bad_file_aio_read(struct kiocb *iocb, const struct iovec *iov,
37            unsigned long nr_segs, loff_t pos)
38{
39    return -EIO;
40}
41
42static ssize_t bad_file_aio_write(struct kiocb *iocb, const struct iovec *iov,
43            unsigned long nr_segs, loff_t pos)
44{
45    return -EIO;
46}
47
48static int bad_file_readdir(struct file *filp, void *dirent, filldir_t filldir)
49{
50    return -EIO;
51}
52
53static unsigned int bad_file_poll(struct file *filp, poll_table *wait)
54{
55    return POLLERR;
56}
57
58static long bad_file_unlocked_ioctl(struct file *file, unsigned cmd,
59            unsigned long arg)
60{
61    return -EIO;
62}
63
64static long bad_file_compat_ioctl(struct file *file, unsigned int cmd,
65            unsigned long arg)
66{
67    return -EIO;
68}
69
70static int bad_file_mmap(struct file *file, struct vm_area_struct *vma)
71{
72    return -EIO;
73}
74
75static int bad_file_open(struct inode *inode, struct file *filp)
76{
77    return -EIO;
78}
79
80static int bad_file_flush(struct file *file, fl_owner_t id)
81{
82    return -EIO;
83}
84
85static int bad_file_release(struct inode *inode, struct file *filp)
86{
87    return -EIO;
88}
89
90static int bad_file_fsync(struct file *file, loff_t start, loff_t end,
91              int datasync)
92{
93    return -EIO;
94}
95
96static int bad_file_aio_fsync(struct kiocb *iocb, int datasync)
97{
98    return -EIO;
99}
100
101static int bad_file_fasync(int fd, struct file *filp, int on)
102{
103    return -EIO;
104}
105
106static int bad_file_lock(struct file *file, int cmd, struct file_lock *fl)
107{
108    return -EIO;
109}
110
111static ssize_t bad_file_sendpage(struct file *file, struct page *page,
112            int off, size_t len, loff_t *pos, int more)
113{
114    return -EIO;
115}
116
117static unsigned long bad_file_get_unmapped_area(struct file *file,
118                unsigned long addr, unsigned long len,
119                unsigned long pgoff, unsigned long flags)
120{
121    return -EIO;
122}
123
124static int bad_file_check_flags(int flags)
125{
126    return -EIO;
127}
128
129static int bad_file_flock(struct file *filp, int cmd, struct file_lock *fl)
130{
131    return -EIO;
132}
133
134static ssize_t bad_file_splice_write(struct pipe_inode_info *pipe,
135            struct file *out, loff_t *ppos, size_t len,
136            unsigned int flags)
137{
138    return -EIO;
139}
140
141static ssize_t bad_file_splice_read(struct file *in, loff_t *ppos,
142            struct pipe_inode_info *pipe, size_t len,
143            unsigned int flags)
144{
145    return -EIO;
146}
147
148static const struct file_operations bad_file_ops =
149{
150    .llseek = bad_file_llseek,
151    .read = bad_file_read,
152    .write = bad_file_write,
153    .aio_read = bad_file_aio_read,
154    .aio_write = bad_file_aio_write,
155    .readdir = bad_file_readdir,
156    .poll = bad_file_poll,
157    .unlocked_ioctl = bad_file_unlocked_ioctl,
158    .compat_ioctl = bad_file_compat_ioctl,
159    .mmap = bad_file_mmap,
160    .open = bad_file_open,
161    .flush = bad_file_flush,
162    .release = bad_file_release,
163    .fsync = bad_file_fsync,
164    .aio_fsync = bad_file_aio_fsync,
165    .fasync = bad_file_fasync,
166    .lock = bad_file_lock,
167    .sendpage = bad_file_sendpage,
168    .get_unmapped_area = bad_file_get_unmapped_area,
169    .check_flags = bad_file_check_flags,
170    .flock = bad_file_flock,
171    .splice_write = bad_file_splice_write,
172    .splice_read = bad_file_splice_read,
173};
174
175static int bad_inode_create (struct inode *dir, struct dentry *dentry,
176        int mode, struct nameidata *nd)
177{
178    return -EIO;
179}
180
181static struct dentry *bad_inode_lookup(struct inode *dir,
182            struct dentry *dentry, struct nameidata *nd)
183{
184    return ERR_PTR(-EIO);
185}
186
187static int bad_inode_link (struct dentry *old_dentry, struct inode *dir,
188        struct dentry *dentry)
189{
190    return -EIO;
191}
192
193static int bad_inode_unlink(struct inode *dir, struct dentry *dentry)
194{
195    return -EIO;
196}
197
198static int bad_inode_symlink (struct inode *dir, struct dentry *dentry,
199        const char *symname)
200{
201    return -EIO;
202}
203
204static int bad_inode_mkdir(struct inode *dir, struct dentry *dentry,
205            int mode)
206{
207    return -EIO;
208}
209
210static int bad_inode_rmdir (struct inode *dir, struct dentry *dentry)
211{
212    return -EIO;
213}
214
215static int bad_inode_mknod (struct inode *dir, struct dentry *dentry,
216            int mode, dev_t rdev)
217{
218    return -EIO;
219}
220
221static int bad_inode_rename (struct inode *old_dir, struct dentry *old_dentry,
222        struct inode *new_dir, struct dentry *new_dentry)
223{
224    return -EIO;
225}
226
227static int bad_inode_readlink(struct dentry *dentry, char __user *buffer,
228        int buflen)
229{
230    return -EIO;
231}
232
233static int bad_inode_permission(struct inode *inode, int mask)
234{
235    return -EIO;
236}
237
238static int bad_inode_getattr(struct vfsmount *mnt, struct dentry *dentry,
239            struct kstat *stat)
240{
241    return -EIO;
242}
243
244static int bad_inode_setattr(struct dentry *direntry, struct iattr *attrs)
245{
246    return -EIO;
247}
248
249static int bad_inode_setxattr(struct dentry *dentry, const char *name,
250        const void *value, size_t size, int flags)
251{
252    return -EIO;
253}
254
255static ssize_t bad_inode_getxattr(struct dentry *dentry, const char *name,
256            void *buffer, size_t size)
257{
258    return -EIO;
259}
260
261static ssize_t bad_inode_listxattr(struct dentry *dentry, char *buffer,
262            size_t buffer_size)
263{
264    return -EIO;
265}
266
267static int bad_inode_removexattr(struct dentry *dentry, const char *name)
268{
269    return -EIO;
270}
271
272static const struct inode_operations bad_inode_ops =
273{
274    .create = bad_inode_create,
275    .lookup = bad_inode_lookup,
276    .link = bad_inode_link,
277    .unlink = bad_inode_unlink,
278    .symlink = bad_inode_symlink,
279    .mkdir = bad_inode_mkdir,
280    .rmdir = bad_inode_rmdir,
281    .mknod = bad_inode_mknod,
282    .rename = bad_inode_rename,
283    .readlink = bad_inode_readlink,
284    /* follow_link must be no-op, otherwise unmounting this inode
285       won't work */
286    /* put_link returns void */
287    /* truncate returns void */
288    .permission = bad_inode_permission,
289    .getattr = bad_inode_getattr,
290    .setattr = bad_inode_setattr,
291    .setxattr = bad_inode_setxattr,
292    .getxattr = bad_inode_getxattr,
293    .listxattr = bad_inode_listxattr,
294    .removexattr = bad_inode_removexattr,
295    /* truncate_range returns void */
296};
297
298
299/*
300 * When a filesystem is unable to read an inode due to an I/O error in
301 * its read_inode() function, it can call make_bad_inode() to return a
302 * set of stubs which will return EIO errors as required.
303 *
304 * We only need to do limited initialisation: all other fields are
305 * preinitialised to zero automatically.
306 */
307 
308/**
309 * make_bad_inode - mark an inode bad due to an I/O error
310 * @inode: Inode to mark bad
311 *
312 * When an inode cannot be read due to a media or remote network
313 * failure this function makes the inode "bad" and causes I/O operations
314 * on it to fail from this point on.
315 */
316 
317void make_bad_inode(struct inode *inode)
318{
319    remove_inode_hash(inode);
320
321    inode->i_mode = S_IFREG;
322    inode->i_atime = inode->i_mtime = inode->i_ctime =
323        current_fs_time(inode->i_sb);
324    inode->i_op = &bad_inode_ops;
325    inode->i_fop = &bad_file_ops;
326}
327EXPORT_SYMBOL(make_bad_inode);
328
329/*
330 * This tests whether an inode has been flagged as bad. The test uses
331 * &bad_inode_ops to cover the case of invalidated inodes as well as
332 * those created by make_bad_inode() above.
333 */
334 
335/**
336 * is_bad_inode - is an inode errored
337 * @inode: inode to test
338 *
339 * Returns true if the inode in question has been marked as bad.
340 */
341 
342int is_bad_inode(struct inode *inode)
343{
344    return (inode->i_op == &bad_inode_ops);
345}
346
347EXPORT_SYMBOL(is_bad_inode);
348
349/**
350 * iget_failed - Mark an under-construction inode as dead and release it
351 * @inode: The inode to discard
352 *
353 * Mark an under-construction inode as dead and release it.
354 */
355void iget_failed(struct inode *inode)
356{
357    make_bad_inode(inode);
358    unlock_new_inode(inode);
359    iput(inode);
360}
361EXPORT_SYMBOL(iget_failed);
362

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