Commit | Line | Data |
---|---|---|
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 | ||
283c0972 JP |
10 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
11 | ||
1107ba88 AZ |
12 | #include <linux/kernel.h> |
13 | #include <linux/errno.h> | |
14 | #include <linux/module.h> | |
15 | #include <linux/fs.h> | |
16 | #include <linux/magic.h> | |
17 | ||
1ccbf534 JF |
18 | #include <xen/xen.h> |
19 | ||
1107ba88 | 20 | #include "xenfs.h" |
d8414d3c | 21 | #include "../privcmd.h" |
2fb3683e | 22 | #include "../xenbus/xenbus_comms.h" |
1107ba88 AZ |
23 | |
24 | #include <asm/xen/hypervisor.h> | |
25 | ||
26 | MODULE_DESCRIPTION("Xen filesystem"); | |
27 | MODULE_LICENSE("GPL"); | |
28 | ||
818fd206 JF |
29 | static ssize_t capabilities_read(struct file *file, char __user *buf, |
30 | size_t size, loff_t *off) | |
31 | { | |
32 | char *tmp = ""; | |
33 | ||
34 | if (xen_initial_domain()) | |
35 | tmp = "control_d\n"; | |
36 | ||
37 | return simple_read_from_buffer(buf, size, off, tmp, strlen(tmp)); | |
38 | } | |
39 | ||
40 | static const struct file_operations capabilities_file_ops = { | |
41 | .read = capabilities_read, | |
6038f373 | 42 | .llseek = default_llseek, |
818fd206 JF |
43 | }; |
44 | ||
1107ba88 AZ |
45 | static int xenfs_fill_super(struct super_block *sb, void *data, int silent) |
46 | { | |
47 | static struct tree_descr xenfs_files[] = { | |
78c3e473 | 48 | [2] = { "xenbus", &xen_xenbus_fops, S_IRUSR|S_IWUSR }, |
818fd206 | 49 | { "capabilities", &capabilities_file_ops, S_IRUGO }, |
d8414d3c | 50 | { "privcmd", &xen_privcmd_fops, S_IRUSR|S_IWUSR }, |
1107ba88 AZ |
51 | {""}, |
52 | }; | |
53 | ||
78c3e473 AV |
54 | static struct tree_descr xenfs_init_files[] = { |
55 | [2] = { "xenbus", &xen_xenbus_fops, S_IRUSR|S_IWUSR }, | |
56 | { "capabilities", &capabilities_file_ops, S_IRUGO }, | |
57 | { "privcmd", &xen_privcmd_fops, S_IRUSR|S_IWUSR }, | |
58 | { "xsd_kva", &xsd_kva_file_ops, S_IRUSR|S_IWUSR}, | |
59 | { "xsd_port", &xsd_port_file_ops, S_IRUSR|S_IWUSR}, | |
a11f4f0a BO |
60 | #ifdef CONFIG_XEN_SYMS |
61 | { "xensyms", &xensyms_ops, S_IRUSR}, | |
62 | #endif | |
78c3e473 AV |
63 | {""}, |
64 | }; | |
1107ba88 | 65 | |
78c3e473 AV |
66 | return simple_fill_super(sb, XENFS_SUPER_MAGIC, |
67 | xen_initial_domain() ? xenfs_init_files : xenfs_files); | |
1107ba88 AZ |
68 | } |
69 | ||
fe61f1d7 JF |
70 | static struct dentry *xenfs_mount(struct file_system_type *fs_type, |
71 | int flags, const char *dev_name, | |
72 | void *data) | |
1107ba88 | 73 | { |
fc14f2fe | 74 | return mount_single(fs_type, flags, data, xenfs_fill_super); |
1107ba88 AZ |
75 | } |
76 | ||
77 | static struct file_system_type xenfs_type = { | |
78 | .owner = THIS_MODULE, | |
79 | .name = "xenfs", | |
fc14f2fe | 80 | .mount = xenfs_mount, |
1107ba88 AZ |
81 | .kill_sb = kill_litter_super, |
82 | }; | |
7f78e035 | 83 | MODULE_ALIAS_FS("xenfs"); |
1107ba88 AZ |
84 | |
85 | static int __init xenfs_init(void) | |
86 | { | |
9045d47e JF |
87 | if (xen_domain()) |
88 | return register_filesystem(&xenfs_type); | |
1107ba88 | 89 | |
283c0972 | 90 | pr_info("not registering filesystem on non-xen platform\n"); |
9045d47e | 91 | return 0; |
1107ba88 AZ |
92 | } |
93 | ||
94 | static void __exit xenfs_exit(void) | |
95 | { | |
43df95c4 | 96 | if (xen_domain()) |
1107ba88 AZ |
97 | unregister_filesystem(&xenfs_type); |
98 | } | |
99 | ||
100 | module_init(xenfs_init); | |
101 | module_exit(xenfs_exit); | |
102 |