This source file includes following definitions.
- sync_block
- sync_iblock
- sync_direct
- sync_indirect
- sync_dindirect
- minix_sync_file
1
2
3
4
5
6
7
8
9
10
11 #include <linux/errno.h>
12 #include <linux/sched.h>
13 #include <linux/stat.h>
14 #include <linux/fcntl.h>
15 #include <linux/locks.h>
16
17 #include <linux/fs.h>
18 #include <linux/minix_fs.h>
19
20 #include <asm/segment.h>
21 #include <asm/system.h>
22
23 #define blocksize BLOCK_SIZE
24 #define addr_per_block 512
25
26 static int sync_block (struct inode * inode, unsigned short * block, int wait)
27 {
28 struct buffer_head * bh;
29 unsigned short tmp;
30
31 if (!*block)
32 return 0;
33 tmp = *block;
34 bh = get_hash_table(inode->i_dev, *block, blocksize);
35 if (!bh)
36 return 0;
37 if (*block != tmp) {
38 brelse (bh);
39 return 1;
40 }
41 if (wait && buffer_req(bh) && !buffer_uptodate(bh)) {
42 brelse(bh);
43 return -1;
44 }
45 if (wait || !buffer_uptodate(bh) || !buffer_dirty(bh))
46 {
47 brelse(bh);
48 return 0;
49 }
50 ll_rw_block(WRITE, 1, &bh);
51 bh->b_count--;
52 return 0;
53 }
54
55 static int sync_iblock (struct inode * inode, unsigned short * iblock,
56 struct buffer_head **bh, int wait)
57 {
58 int rc;
59 unsigned short tmp;
60
61 *bh = NULL;
62 tmp = *iblock;
63 if (!tmp)
64 return 0;
65 rc = sync_block (inode, iblock, wait);
66 if (rc)
67 return rc;
68 *bh = bread(inode->i_dev, tmp, blocksize);
69 if (tmp != *iblock) {
70 brelse(*bh);
71 *bh = NULL;
72 return 1;
73 }
74 if (!*bh)
75 return -1;
76 return 0;
77 }
78
79
80 static int sync_direct(struct inode *inode, int wait)
81 {
82 int i;
83 int rc, err = 0;
84
85 for (i = 0; i < 7; i++) {
86 rc = sync_block (inode, inode->u.minix_i.i_data + i, wait);
87 if (rc > 0)
88 break;
89 if (rc)
90 err = rc;
91 }
92 return err;
93 }
94
95 static int sync_indirect(struct inode *inode, unsigned short *iblock, int wait)
96 {
97 int i;
98 struct buffer_head * ind_bh;
99 int rc, err = 0;
100
101 rc = sync_iblock (inode, iblock, &ind_bh, wait);
102 if (rc || !ind_bh)
103 return rc;
104
105 for (i = 0; i < addr_per_block; i++) {
106 rc = sync_block (inode,
107 ((unsigned short *) ind_bh->b_data) + i,
108 wait);
109 if (rc > 0)
110 break;
111 if (rc)
112 err = rc;
113 }
114 brelse(ind_bh);
115 return err;
116 }
117
118 static int sync_dindirect(struct inode *inode, unsigned short *diblock,
119 int wait)
120 {
121 int i;
122 struct buffer_head * dind_bh;
123 int rc, err = 0;
124
125 rc = sync_iblock (inode, diblock, &dind_bh, wait);
126 if (rc || !dind_bh)
127 return rc;
128
129 for (i = 0; i < addr_per_block; i++) {
130 rc = sync_indirect (inode,
131 ((unsigned short *) dind_bh->b_data) + i,
132 wait);
133 if (rc > 0)
134 break;
135 if (rc)
136 err = rc;
137 }
138 brelse(dind_bh);
139 return err;
140 }
141
142 int minix_sync_file(struct inode * inode, struct file * file)
143 {
144 int wait, err = 0;
145
146 if (!(S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode) ||
147 S_ISLNK(inode->i_mode)))
148 return -EINVAL;
149
150 for (wait=0; wait<=1; wait++)
151 {
152 err |= sync_direct(inode, wait);
153 err |= sync_indirect(inode, inode->u.minix_i.i_data+7, wait);
154 err |= sync_dindirect(inode, inode->u.minix_i.i_data+8, wait);
155 }
156 err |= minix_sync_inode (inode);
157 return (err < 0) ? -EIO : 0;
158 }