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
|
/*
* Copyright (C) 2005-2016 Junjiro R. Okajima
*/
/*
* lookup and dentry operations
*/
#ifndef __AUFS_DENTRY_H__
#define __AUFS_DENTRY_H__
#ifdef __KERNEL__
#include <linux/dcache.h>
#include "rwsem.h"
struct au_hdentry {
struct dentry *hd_dentry;
aufs_bindex_t hd_id;
};
struct au_dinfo {
atomic_t di_generation;
struct au_rwsem di_rwsem;
aufs_bindex_t di_bstart, di_bend, di_bwh, di_bdiropq;
unsigned char di_tmpfile; /* to allow the different name */
struct au_hdentry *di_hdentry;
} ____cacheline_aligned_in_smp;
/* ---------------------------------------------------------------------- */
/* dentry.c */
extern const struct dentry_operations aufs_dop, aufs_dop_noreval;
struct au_branch;
struct dentry *au_sio_lkup_one(struct qstr *name, struct dentry *parent);
int au_h_verify(struct dentry *h_dentry, unsigned int udba, struct inode *h_dir,
struct dentry *h_parent, struct au_branch *br);
int au_lkup_dentry(struct dentry *dentry, aufs_bindex_t bstart, mode_t type);
int au_lkup_neg(struct dentry *dentry, aufs_bindex_t bindex, int wh);
int au_refresh_dentry(struct dentry *dentry, struct dentry *parent);
int au_reval_dpath(struct dentry *dentry, unsigned int sigen);
void au_refresh_dop(struct dentry *dentry, int force_reval);
/* dinfo.c */
void au_di_init_once(void *_di);
struct au_dinfo *au_di_alloc(struct super_block *sb, unsigned int lsc);
void au_di_free(struct au_dinfo *dinfo);
void au_di_swap(struct au_dinfo *a, struct au_dinfo *b);
void au_di_cp(struct au_dinfo *dst, struct au_dinfo *src);
int au_di_init(struct dentry *dentry);
void au_di_fin(struct dentry *dentry);
int au_di_realloc(struct au_dinfo *dinfo, int nbr);
void di_read_lock(struct dentry *d, int flags, unsigned int lsc);
void di_read_unlock(struct dentry *d, int flags);
void di_downgrade_lock(struct dentry *d, int flags);
void di_write_lock(struct dentry *d, unsigned int lsc);
void di_write_unlock(struct dentry *d);
void di_write_lock2_child(struct dentry *d1, struct dentry *d2, int isdir);
void di_write_lock2_parent(struct dentry *d1, struct dentry *d2, int isdir);
void di_write_unlock2(struct dentry *d1, struct dentry *d2);
struct dentry *au_h_dptr(struct dentry *dentry, aufs_bindex_t bindex);
struct dentry *au_h_d_alias(struct dentry *dentry, aufs_bindex_t bindex);
aufs_bindex_t au_dbtail(struct dentry *dentry);
aufs_bindex_t au_dbtaildir(struct dentry *dentry);
void au_set_h_dptr(struct dentry *dentry, aufs_bindex_t bindex,
struct dentry *h_dentry);
int au_digen_test(struct dentry *dentry, unsigned int sigen);
int au_dbrange_test(struct dentry *dentry);
void au_update_digen(struct dentry *dentry);
void au_update_dbrange(struct dentry *dentry, int do_put_zero);
void au_update_dbstart(struct dentry *dentry);
void au_update_dbend(struct dentry *dentry);
int au_find_dbindex(struct dentry *dentry, struct dentry *h_dentry);
/* ---------------------------------------------------------------------- */
static inline struct au_dinfo *au_di(struct dentry *dentry)
{
return dentry->d_fsdata;
}
/* ---------------------------------------------------------------------- */
/* lock subclass for dinfo */
enum {
AuLsc_DI_CHILD, /* child first */
AuLsc_DI_CHILD2, /* rename(2), link(2), and cpup at hnotify */
AuLsc_DI_CHILD3, /* copyup dirs */
AuLsc_DI_PARENT,
AuLsc_DI_PARENT2,
AuLsc_DI_PARENT3,
AuLsc_DI_TMP /* temp for replacing dinfo */
};
/*
* di_read_lock_child, di_write_lock_child,
* di_read_lock_child2, di_write_lock_child2,
* di_read_lock_child3, di_write_lock_child3,
* di_read_lock_parent, di_write_lock_parent,
* di_read_lock_parent2, di_write_lock_parent2,
* di_read_lock_parent3, di_write_lock_parent3,
*/
#define AuReadLockFunc(name, lsc) \
static inline void di_read_lock_##name(struct dentry *d, int flags) \
{ di_read_lock(d, flags, AuLsc_DI_##lsc); }
#define AuWriteLockFunc(name, lsc) \
static inline void di_write_lock_##name(struct dentry *d) \
{ di_write_lock(d, AuLsc_DI_##lsc); }
#define AuRWLockFuncs(name, lsc) \
AuReadLockFunc(name, lsc) \
AuWriteLockFunc(name, lsc)
AuRWLockFuncs(child, CHILD);
AuRWLockFuncs(child2, CHILD2);
AuRWLockFuncs(child3, CHILD3);
AuRWLockFuncs(parent, PARENT);
AuRWLockFuncs(parent2, PARENT2);
AuRWLockFuncs(parent3, PARENT3);
#undef AuReadLockFunc
#undef AuWriteLockFunc
#undef AuRWLockFuncs
#define DiMustNoWaiters(d) AuRwMustNoWaiters(&au_di(d)->di_rwsem)
#define DiMustAnyLock(d) AuRwMustAnyLock(&au_di(d)->di_rwsem)
#define DiMustWriteLock(d) AuRwMustWriteLock(&au_di(d)->di_rwsem)
/* ---------------------------------------------------------------------- */
/* todo: memory barrier? */
static inline unsigned int au_digen(struct dentry *d)
{
return atomic_read(&au_di(d)->di_generation);
}
static inline void au_h_dentry_init(struct au_hdentry *hdentry)
{
hdentry->hd_dentry = NULL;
}
static inline void au_hdput(struct au_hdentry *hd)
{
if (hd)
dput(hd->hd_dentry);
}
static inline aufs_bindex_t au_dbstart(struct dentry *dentry)
{
DiMustAnyLock(dentry);
return au_di(dentry)->di_bstart;
}
static inline aufs_bindex_t au_dbend(struct dentry *dentry)
{
DiMustAnyLock(dentry);
return au_di(dentry)->di_bend;
}
static inline aufs_bindex_t au_dbwh(struct dentry *dentry)
{
DiMustAnyLock(dentry);
return au_di(dentry)->di_bwh;
}
static inline aufs_bindex_t au_dbdiropq(struct dentry *dentry)
{
DiMustAnyLock(dentry);
return au_di(dentry)->di_bdiropq;
}
/* todo: hard/soft set? */
static inline void au_set_dbstart(struct dentry *dentry, aufs_bindex_t bindex)
{
DiMustWriteLock(dentry);
au_di(dentry)->di_bstart = bindex;
}
static inline void au_set_dbend(struct dentry *dentry, aufs_bindex_t bindex)
{
DiMustWriteLock(dentry);
au_di(dentry)->di_bend = bindex;
}
static inline void au_set_dbwh(struct dentry *dentry, aufs_bindex_t bindex)
{
DiMustWriteLock(dentry);
/* dbwh can be outside of bstart - bend range */
au_di(dentry)->di_bwh = bindex;
}
static inline void au_set_dbdiropq(struct dentry *dentry, aufs_bindex_t bindex)
{
DiMustWriteLock(dentry);
au_di(dentry)->di_bdiropq = bindex;
}
/* ---------------------------------------------------------------------- */
#ifdef CONFIG_AUFS_HNOTIFY
static inline void au_digen_dec(struct dentry *d)
{
atomic_dec(&au_di(d)->di_generation);
}
static inline void au_hn_di_reinit(struct dentry *dentry)
{
dentry->d_fsdata = NULL;
}
#else
AuStubVoid(au_hn_di_reinit, struct dentry *dentry __maybe_unused)
#endif /* CONFIG_AUFS_HNOTIFY */
#endif /* __KERNEL__ */
#endif /* __AUFS_DENTRY_H__ */
|
