933a90bf4f
Pull vfs mount updates from Al Viro: "The first part of mount updates. Convert filesystems to use the new mount API" * 'work.mount0' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs: (63 commits) mnt_init(): call shmem_init() unconditionally constify ksys_mount() string arguments don't bother with registering rootfs init_rootfs(): don't bother with init_ramfs_fs() vfs: Convert smackfs to use the new mount API vfs: Convert selinuxfs to use the new mount API vfs: Convert securityfs to use the new mount API vfs: Convert apparmorfs to use the new mount API vfs: Convert openpromfs to use the new mount API vfs: Convert xenfs to use the new mount API vfs: Convert gadgetfs to use the new mount API vfs: Convert oprofilefs to use the new mount API vfs: Convert ibmasmfs to use the new mount API vfs: Convert qib_fs/ipathfs to use the new mount API vfs: Convert efivarfs to use the new mount API vfs: Convert configfs to use the new mount API vfs: Convert binfmt_misc to use the new mount API convenience helper: get_tree_single() convenience helper get_tree_nodev() vfs: Kill sget_userns() ...
112 lines
2.6 KiB
C
112 lines
2.6 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
|
|
/*
|
|
* xenfs.c - a filesystem for passing info between the a domain and
|
|
* the hypervisor.
|
|
*
|
|
* 2008-10-07 Alex Zeffertt Replaced /proc/xen/xenbus with xenfs filesystem
|
|
* and /proc/xen compatibility mount point.
|
|
* Turned xenfs into a loadable module.
|
|
*/
|
|
|
|
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
|
|
|
|
#include <linux/kernel.h>
|
|
#include <linux/errno.h>
|
|
#include <linux/module.h>
|
|
#include <linux/fs.h>
|
|
#include <linux/fs_context.h>
|
|
#include <linux/magic.h>
|
|
|
|
#include <xen/xen.h>
|
|
#include <xen/xenbus.h>
|
|
|
|
#include "xenfs.h"
|
|
#include "../privcmd.h"
|
|
|
|
#include <asm/xen/hypervisor.h>
|
|
|
|
MODULE_DESCRIPTION("Xen filesystem");
|
|
MODULE_LICENSE("GPL");
|
|
|
|
static ssize_t capabilities_read(struct file *file, char __user *buf,
|
|
size_t size, loff_t *off)
|
|
{
|
|
char *tmp = "";
|
|
|
|
if (xen_initial_domain())
|
|
tmp = "control_d\n";
|
|
|
|
return simple_read_from_buffer(buf, size, off, tmp, strlen(tmp));
|
|
}
|
|
|
|
static const struct file_operations capabilities_file_ops = {
|
|
.read = capabilities_read,
|
|
.llseek = default_llseek,
|
|
};
|
|
|
|
static int xenfs_fill_super(struct super_block *sb, struct fs_context *fc)
|
|
{
|
|
static const struct tree_descr xenfs_files[] = {
|
|
[2] = { "xenbus", &xen_xenbus_fops, S_IRUSR|S_IWUSR },
|
|
{ "capabilities", &capabilities_file_ops, S_IRUGO },
|
|
{ "privcmd", &xen_privcmd_fops, S_IRUSR|S_IWUSR },
|
|
{""},
|
|
};
|
|
|
|
static const struct tree_descr xenfs_init_files[] = {
|
|
[2] = { "xenbus", &xen_xenbus_fops, S_IRUSR|S_IWUSR },
|
|
{ "capabilities", &capabilities_file_ops, S_IRUGO },
|
|
{ "privcmd", &xen_privcmd_fops, S_IRUSR|S_IWUSR },
|
|
{ "xsd_kva", &xsd_kva_file_ops, S_IRUSR|S_IWUSR},
|
|
{ "xsd_port", &xsd_port_file_ops, S_IRUSR|S_IWUSR},
|
|
#ifdef CONFIG_XEN_SYMS
|
|
{ "xensyms", &xensyms_ops, S_IRUSR},
|
|
#endif
|
|
{""},
|
|
};
|
|
|
|
return simple_fill_super(sb, XENFS_SUPER_MAGIC,
|
|
xen_initial_domain() ? xenfs_init_files : xenfs_files);
|
|
}
|
|
|
|
static int xenfs_get_tree(struct fs_context *fc)
|
|
{
|
|
return get_tree_single(fc, xenfs_fill_super);
|
|
}
|
|
|
|
static const struct fs_context_operations xenfs_context_ops = {
|
|
.get_tree = xenfs_get_tree,
|
|
};
|
|
|
|
static int xenfs_init_fs_context(struct fs_context *fc)
|
|
{
|
|
fc->ops = &xenfs_context_ops;
|
|
return 0;
|
|
}
|
|
|
|
static struct file_system_type xenfs_type = {
|
|
.owner = THIS_MODULE,
|
|
.name = "xenfs",
|
|
.init_fs_context = xenfs_init_fs_context,
|
|
.kill_sb = kill_litter_super,
|
|
};
|
|
MODULE_ALIAS_FS("xenfs");
|
|
|
|
static int __init xenfs_init(void)
|
|
{
|
|
if (xen_domain())
|
|
return register_filesystem(&xenfs_type);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void __exit xenfs_exit(void)
|
|
{
|
|
if (xen_domain())
|
|
unregister_filesystem(&xenfs_type);
|
|
}
|
|
|
|
module_init(xenfs_init);
|
|
module_exit(xenfs_exit);
|
|
|