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
|
/*
* QNX4 file system, Linux implementation.
*
* Version : 0.1
*
* Using parts of the xiafs filesystem.
*
* History :
*
* 24-03-1998 by Richard Frowijn : first release.
*/
#include <linux/config.h>
#include <linux/errno.h>
#include <linux/time.h>
#include <linux/stat.h>
#include <linux/fcntl.h>
#include <linux/smp_lock.h>
#include <linux/buffer_head.h>
#include <linux/fs.h>
#include <linux/qnx4_fs.h>
#include <asm/system.h>
/*
* The functions for qnx4 fs file synchronization.
*/
#ifdef CONFIG_QNX4FS_RW
static int sync_block(struct inode *inode, unsigned short *block, int wait)
{
struct buffer_head *bh;
unsigned short tmp;
if (!*block)
return 0;
tmp = *block;
bh = sb_find_get_block(inode->i_sb, *block);
if (!bh)
return 0;
if (*block != tmp) {
brelse(bh);
return 1;
}
if (wait && buffer_req(bh) && !buffer_uptodate(bh)) {
brelse(bh);
return -1;
}
if (wait || !buffer_uptodate(bh) || !buffer_dirty(bh)) {
brelse(bh);
return 0;
}
ll_rw_block(WRITE, 1, &bh);
atomic_dec(&bh->b_count);
return 0;
}
#ifdef WTF
static int sync_iblock(struct inode *inode, unsigned short *iblock,
struct buffer_head **bh, int wait)
{
int rc;
unsigned short tmp;
*bh = NULL;
tmp = *iblock;
if (!tmp)
return 0;
rc = sync_block(inode, iblock, wait);
if (rc)
return rc;
*bh = sb_bread(inode->i_sb, tmp);
if (tmp != *iblock) {
brelse(*bh);
*bh = NULL;
return 1;
}
if (!*bh)
return -1;
return 0;
}
#endif
static int sync_direct(struct inode *inode, int wait)
{
int i;
int rc, err = 0;
for (i = 0; i < 7; i++) {
rc = sync_block(inode,
(unsigned short *) qnx4_raw_inode(inode)->di_first_xtnt.xtnt_blk + i, wait);
if (rc > 0)
break;
if (rc)
err = rc;
}
return err;
}
#ifdef WTF
static int sync_indirect(struct inode *inode, unsigned short *iblock, int wait)
{
int i;
struct buffer_head *ind_bh;
int rc, err = 0;
rc = sync_iblock(inode, iblock, &ind_bh, wait);
if (rc || !ind_bh)
return rc;
for (i = 0; i < 512; i++) {
rc = sync_block(inode,
((unsigned short *) ind_bh->b_data) + i,
wait);
if (rc > 0)
break;
if (rc)
err = rc;
}
brelse(ind_bh);
return err;
}
static int sync_dindirect(struct inode *inode, unsigned short *diblock,
int wait)
{
int i;
struct buffer_head *dind_bh;
int rc, err = 0;
rc = sync_iblock(inode, diblock, &dind_bh, wait);
if (rc || !dind_bh)
return rc;
for (i = 0; i < 512; i++) {
rc = sync_indirect(inode,
((unsigned short *) dind_bh->b_data) + i,
wait);
if (rc > 0)
break;
if (rc)
err = rc;
}
brelse(dind_bh);
return err;
}
#endif
int qnx4_sync_file(struct file *file, struct dentry *dentry, int unused)
{
struct inode *inode = dentry->d_inode;
int wait, err = 0;
(void) file;
if (!(S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode) ||
S_ISLNK(inode->i_mode)))
return -EINVAL;
lock_kernel();
for (wait = 0; wait <= 1; wait++) {
err |= sync_direct(inode, wait);
}
err |= qnx4_sync_inode(inode);
unlock_kernel();
return (err < 0) ? -EIO : 0;
}
#endif
|
