1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
|
/*
* Copyright (C) 2005-2015 Junjiro R. Okajima
*/
/*
* sub-routines for VFS
*/
#ifndef __AUFS_VFSUB_H__
#define __AUFS_VFSUB_H__
#ifdef __KERNEL__
#include <linux/fs.h>
#include <linux/mount.h>
#include <linux/xattr.h>
#include "debug.h"
/* copied from linux/fs/internal.h */
/* todo: BAD approach!! */
extern void __mnt_drop_write(struct vfsmount *);
extern int open_check_o_direct(struct file *f);
/* ---------------------------------------------------------------------- */
/* lock subclass for lower inode */
/* default MAX_LOCKDEP_SUBCLASSES(8) is not enough */
/* reduce? gave up. */
enum {
AuLsc_I_Begin = I_MUTEX_PARENT2, /* 5 */
AuLsc_I_PARENT, /* lower inode, parent first */
AuLsc_I_PARENT2, /* copyup dirs */
AuLsc_I_PARENT3, /* copyup wh */
AuLsc_I_CHILD,
AuLsc_I_CHILD2,
AuLsc_I_End
};
/* to debug easier, do not make them inlined functions */
#define MtxMustLock(mtx) AuDebugOn(!mutex_is_locked(mtx))
#define IMustLock(i) MtxMustLock(&(i)->i_mutex)
/* ---------------------------------------------------------------------- */
static inline void vfsub_drop_nlink(struct inode *inode)
{
AuDebugOn(!inode->i_nlink);
drop_nlink(inode);
}
static inline void vfsub_dead_dir(struct inode *inode)
{
AuDebugOn(!S_ISDIR(inode->i_mode));
inode->i_flags |= S_DEAD;
clear_nlink(inode);
}
static inline int vfsub_native_ro(struct inode *inode)
{
return (inode->i_sb->s_flags & MS_RDONLY)
|| IS_RDONLY(inode)
/* || IS_APPEND(inode) */
|| IS_IMMUTABLE(inode);
}
/* ---------------------------------------------------------------------- */
int vfsub_update_h_iattr(struct path *h_path, int *did);
struct file *vfsub_dentry_open(struct path *path, int flags);
struct file *vfsub_filp_open(const char *path, int oflags, int mode);
struct vfsub_aopen_args {
struct file *file;
unsigned int open_flag;
umode_t create_mode;
int *opened;
};
struct au_branch;
int vfsub_atomic_open(struct inode *dir, struct dentry *dentry,
struct vfsub_aopen_args *args, struct au_branch *br);
int vfsub_kern_path(const char *name, unsigned int flags, struct path *path);
struct dentry *vfsub_lookup_one_len(const char *name, struct dentry *parent,
int len);
struct vfsub_lkup_one_args {
struct dentry **errp;
struct qstr *name;
struct dentry *parent;
};
static inline struct dentry *vfsub_lkup_one(struct qstr *name,
struct dentry *parent)
{
return vfsub_lookup_one_len(name->name, parent, name->len);
}
void vfsub_call_lkup_one(void *args);
/* ---------------------------------------------------------------------- */
static inline int vfsub_mnt_want_write(struct vfsmount *mnt)
{
int err;
lockdep_off();
err = mnt_want_write(mnt);
lockdep_on();
return err;
}
static inline void vfsub_mnt_drop_write(struct vfsmount *mnt)
{
lockdep_off();
mnt_drop_write(mnt);
lockdep_on();
}
#if 0 /* reserved */
static inline void vfsub_mnt_drop_write_file(struct file *file)
{
lockdep_off();
mnt_drop_write_file(file);
lockdep_on();
}
#endif
/* ---------------------------------------------------------------------- */
struct au_hinode;
struct dentry *vfsub_lock_rename(struct dentry *d1, struct au_hinode *hdir1,
struct dentry *d2, struct au_hinode *hdir2);
void vfsub_unlock_rename(struct dentry *d1, struct au_hinode *hdir1,
struct dentry *d2, struct au_hinode *hdir2);
int vfsub_create(struct inode *dir, struct path *path, int mode,
bool want_excl);
int vfsub_symlink(struct inode *dir, struct path *path,
const char *symname);
int vfsub_mknod(struct inode *dir, struct path *path, int mode, dev_t dev);
int vfsub_link(struct dentry *src_dentry, struct inode *dir,
struct path *path, struct inode **delegated_inode);
int vfsub_rename(struct inode *src_hdir, struct dentry *src_dentry,
struct inode *hdir, struct path *path,
struct inode **delegated_inode);
int vfsub_mkdir(struct inode *dir, struct path *path, int mode);
int vfsub_rmdir(struct inode *dir, struct path *path);
/* ---------------------------------------------------------------------- */
ssize_t vfsub_read_u(struct file *file, char __user *ubuf, size_t count,
loff_t *ppos);
ssize_t vfsub_read_k(struct file *file, void *kbuf, size_t count,
loff_t *ppos);
ssize_t vfsub_write_u(struct file *file, const char __user *ubuf, size_t count,
loff_t *ppos);
ssize_t vfsub_write_k(struct file *file, void *kbuf, size_t count,
loff_t *ppos);
int vfsub_flush(struct file *file, fl_owner_t id);
int vfsub_iterate_dir(struct file *file, struct dir_context *ctx);
static inline loff_t vfsub_f_size_read(struct file *file)
{
return i_size_read(file_inode(file));
}
static inline unsigned int vfsub_file_flags(struct file *file)
{
unsigned int flags;
spin_lock(&file->f_lock);
flags = file->f_flags;
spin_unlock(&file->f_lock);
return flags;
}
#if 0 /* reserved */
static inline void vfsub_file_accessed(struct file *h_file)
{
file_accessed(h_file);
vfsub_update_h_iattr(&h_file->f_path, /*did*/NULL); /*ignore*/
}
#endif
#if 0 /* reserved */
static inline void vfsub_touch_atime(struct vfsmount *h_mnt,
struct dentry *h_dentry)
{
struct path h_path = {
.dentry = h_dentry,
.mnt = h_mnt
};
touch_atime(&h_path);
vfsub_update_h_iattr(&h_path, /*did*/NULL); /*ignore*/
}
#endif
static inline int vfsub_update_time(struct inode *h_inode, struct timespec *ts,
int flags)
{
return generic_update_time(h_inode, ts, flags);
/* no vfsub_update_h_iattr() since we don't have struct path */
}
long vfsub_splice_to(struct file *in, loff_t *ppos,
struct pipe_inode_info *pipe, size_t len,
unsigned int flags);
long vfsub_splice_from(struct pipe_inode_info *pipe, struct file *out,
loff_t *ppos, size_t len, unsigned int flags);
static inline long vfsub_truncate(struct path *path, loff_t length)
{
long err;
lockdep_off();
err = vfs_truncate(path, length);
lockdep_on();
return err;
}
int vfsub_trunc(struct path *h_path, loff_t length, unsigned int attr,
struct file *h_file);
int vfsub_fsync(struct file *file, struct path *path, int datasync);
/* ---------------------------------------------------------------------- */
static inline loff_t vfsub_llseek(struct file *file, loff_t offset, int origin)
{
loff_t err;
lockdep_off();
err = vfs_llseek(file, offset, origin);
lockdep_on();
return err;
}
/* ---------------------------------------------------------------------- */
int vfsub_sio_mkdir(struct inode *dir, struct path *path, int mode);
int vfsub_sio_rmdir(struct inode *dir, struct path *path);
int vfsub_sio_notify_change(struct path *path, struct iattr *ia,
struct inode **delegated_inode);
int vfsub_notify_change(struct path *path, struct iattr *ia,
struct inode **delegated_inode);
int vfsub_unlink(struct inode *dir, struct path *path,
struct inode **delegated_inode, int force);
/* ---------------------------------------------------------------------- */
static inline int vfsub_setxattr(struct dentry *dentry, const char *name,
const void *value, size_t size, int flags)
{
int err;
lockdep_off();
err = vfs_setxattr(dentry, name, value, size, flags);
lockdep_on();
return err;
}
static inline int vfsub_removexattr(struct dentry *dentry, const char *name)
{
int err;
lockdep_off();
err = vfs_removexattr(dentry, name);
lockdep_on();
return err;
}
#endif /* __KERNEL__ */
#endif /* __AUFS_VFSUB_H__ */
|
