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
|
/*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation; version 2.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*/
#include <common.h>
#include <fs.h>
#include <linux/fs.h>
/*
* Lookup the data. This is trivial - if the dentry didn't already
* exist, we know it is negative. Set d_op to delete negative dentries.
*/
struct dentry *simple_lookup(struct inode *dir, struct dentry *dentry, unsigned int flags)
{
return NULL;
}
/* Relationship between i_mode and the DT_xxx types */
static inline unsigned char dt_type(struct inode *inode)
{
return (inode->i_mode >> 12) & 15;
}
int dcache_readdir(struct file *file, struct dir_context *ctx)
{
struct dentry *dentry = file->f_path.dentry;
struct dentry *d;
dir_emit_dots(file, ctx);
list_for_each_entry(d, &dentry->d_subdirs, d_child) {
if (d_is_negative(d))
continue;
dir_emit(ctx, d->d_name.name, d->d_name.len,
d_inode(d)->i_ino, dt_type(d_inode(d)));
}
return 0;
}
const struct file_operations simple_dir_operations = {
.iterate = dcache_readdir,
};
int simple_empty(struct dentry *dentry)
{
struct dentry *child;
int ret = 0;
list_for_each_entry(child, &dentry->d_subdirs, d_child) {
if (d_is_positive(child))
goto out;
}
ret = 1;
out:
return ret;
}
int simple_unlink(struct inode *dir, struct dentry *dentry)
{
struct inode *inode = d_inode(dentry);
drop_nlink(inode);
dput(dentry);
return 0;
}
int simple_rmdir(struct inode *dir, struct dentry *dentry)
{
if (IS_ROOT(dentry))
return -EBUSY;
if (!simple_empty(dentry))
return -ENOTEMPTY;
drop_nlink(d_inode(dentry));
simple_unlink(dir, dentry);
drop_nlink(dir);
return 0;
}
const char *simple_get_link(struct dentry *dentry, struct inode *inode)
{
return inode->i_link;
}
const struct inode_operations simple_symlink_inode_operations = {
.get_link = simple_get_link,
};
|