blob: df3a863714099914251c70abdc53f85c817bdbcc (
plain)
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
|
/*
FUSE: Filesystem in Userspace
Copyright (C) 2001 Miklos Szeredi (mszeredi@inf.bme.hu)
This program can be distributed under the terms of the GNU GPL.
See the file COPYING.
*/
#include "fuse_i.h"
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/pagemap.h>
static int fuse_open(struct inode *inode, struct file *file)
{
struct fuse_conn *fc = INO_FC(inode);
struct fuse_in in = FUSE_IN_INIT;
struct fuse_out out = FUSE_OUT_INIT;
struct fuse_open_in arg;
arg.flags = file->f_flags & ~O_EXCL;
in.h.opcode = FUSE_OPEN;
in.h.ino = inode->i_ino;
in.argsize = sizeof(arg);
in.arg = &arg;
request_send(fc, &in, &out);
return out.h.error;
}
static int fuse_readpage(struct file *file, struct page *page)
{
struct inode *inode = page->mapping->host;
struct fuse_conn *fc = INO_FC(inode);
struct fuse_in in = FUSE_IN_INIT;
struct fuse_out out = FUSE_OUT_INIT;
struct fuse_read_in arg;
char *buffer;
buffer = kmap(page);
arg.offset = page->index << PAGE_CACHE_SHIFT;
arg.size = PAGE_CACHE_SIZE;
in.h.opcode = FUSE_READ;
in.h.ino = inode->i_ino;
in.argsize = sizeof(arg);
in.arg = &arg;
out.argsize = PAGE_CACHE_SIZE;
out.argvar = 1;
out.arg = buffer;
request_send(fc, &in, &out);
if(!out.h.error) {
if(out.argsize < PAGE_CACHE_SIZE)
memset(buffer + out.argsize, 0,
PAGE_CACHE_SIZE - out.argsize);
SetPageUptodate(page);
}
kunmap(page);
UnlockPage(page);
return out.h.error;
}
static struct file_operations fuse_file_operations = {
open: fuse_open,
read: generic_file_read,
};
static struct address_space_operations fuse_file_aops = {
readpage: fuse_readpage,
};
void fuse_init_file_inode(struct inode *inode)
{
inode->i_fop = &fuse_file_operations;
inode->i_data.a_ops = &fuse_file_aops;
}
/*
* Local Variables:
* indent-tabs-mode: t
* c-basic-offset: 8
* End:
*/
|
