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Commit | Line | Data |
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1107ba88 AZ |
1 | /* |
2 | * xenfs.c - a filesystem for passing info between the a domain and | |
3 | * the hypervisor. | |
4 | * | |
5 | * 2008-10-07 Alex Zeffertt Replaced /proc/xen/xenbus with xenfs filesystem | |
6 | * and /proc/xen compatibility mount point. | |
7 | * Turned xenfs into a loadable module. | |
8 | */ | |
9 | ||
10 | #include <linux/kernel.h> | |
11 | #include <linux/errno.h> | |
12 | #include <linux/module.h> | |
13 | #include <linux/fs.h> | |
14 | #include <linux/magic.h> | |
15 | ||
1ccbf534 JF |
16 | #include <xen/xen.h> |
17 | ||
1107ba88 | 18 | #include "xenfs.h" |
d8414d3c | 19 | #include "../privcmd.h" |
2fb3683e | 20 | #include "../xenbus/xenbus_comms.h" |
1107ba88 AZ |
21 | |
22 | #include <asm/xen/hypervisor.h> | |
23 | ||
24 | MODULE_DESCRIPTION("Xen filesystem"); | |
25 | MODULE_LICENSE("GPL"); | |
26 | ||
818fd206 JF |
27 | static ssize_t capabilities_read(struct file *file, char __user *buf, |
28 | size_t size, loff_t *off) | |
29 | { | |
30 | char *tmp = ""; | |
31 | ||
32 | if (xen_initial_domain()) | |
33 | tmp = "control_d\n"; | |
34 | ||
35 | return simple_read_from_buffer(buf, size, off, tmp, strlen(tmp)); | |
36 | } | |
37 | ||
38 | static const struct file_operations capabilities_file_ops = { | |
39 | .read = capabilities_read, | |
6038f373 | 40 | .llseek = default_llseek, |
818fd206 JF |
41 | }; |
42 | ||
1107ba88 AZ |
43 | static int xenfs_fill_super(struct super_block *sb, void *data, int silent) |
44 | { | |
45 | static struct tree_descr xenfs_files[] = { | |
78c3e473 | 46 | [2] = { "xenbus", &xen_xenbus_fops, S_IRUSR|S_IWUSR }, |
818fd206 | 47 | { "capabilities", &capabilities_file_ops, S_IRUGO }, |
d8414d3c | 48 | { "privcmd", &xen_privcmd_fops, S_IRUSR|S_IWUSR }, |
1107ba88 AZ |
49 | {""}, |
50 | }; | |
51 | ||
78c3e473 AV |
52 | static struct tree_descr xenfs_init_files[] = { |
53 | [2] = { "xenbus", &xen_xenbus_fops, S_IRUSR|S_IWUSR }, | |
54 | { "capabilities", &capabilities_file_ops, S_IRUGO }, | |
55 | { "privcmd", &xen_privcmd_fops, S_IRUSR|S_IWUSR }, | |
56 | { "xsd_kva", &xsd_kva_file_ops, S_IRUSR|S_IWUSR}, | |
57 | { "xsd_port", &xsd_port_file_ops, S_IRUSR|S_IWUSR}, | |
58 | {""}, | |
59 | }; | |
1107ba88 | 60 | |
78c3e473 AV |
61 | return simple_fill_super(sb, XENFS_SUPER_MAGIC, |
62 | xen_initial_domain() ? xenfs_init_files : xenfs_files); | |
1107ba88 AZ |
63 | } |
64 | ||
fe61f1d7 JF |
65 | static struct dentry *xenfs_mount(struct file_system_type *fs_type, |
66 | int flags, const char *dev_name, | |
67 | void *data) | |
1107ba88 | 68 | { |
fc14f2fe | 69 | return mount_single(fs_type, flags, data, xenfs_fill_super); |
1107ba88 AZ |
70 | } |
71 | ||
72 | static struct file_system_type xenfs_type = { | |
73 | .owner = THIS_MODULE, | |
74 | .name = "xenfs", | |
fc14f2fe | 75 | .mount = xenfs_mount, |
1107ba88 AZ |
76 | .kill_sb = kill_litter_super, |
77 | }; | |
7f78e035 | 78 | MODULE_ALIAS_FS("xenfs"); |
1107ba88 AZ |
79 | |
80 | static int __init xenfs_init(void) | |
81 | { | |
9045d47e JF |
82 | if (xen_domain()) |
83 | return register_filesystem(&xenfs_type); | |
1107ba88 | 84 | |
9045d47e JF |
85 | printk(KERN_INFO "XENFS: not registering filesystem on non-xen platform\n"); |
86 | return 0; | |
1107ba88 AZ |
87 | } |
88 | ||
89 | static void __exit xenfs_exit(void) | |
90 | { | |
43df95c4 | 91 | if (xen_domain()) |
1107ba88 AZ |
92 | unregister_filesystem(&xenfs_type); |
93 | } | |
94 | ||
95 | module_init(xenfs_init); | |
96 | module_exit(xenfs_exit); | |
97 |