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Commit 818fd206 authored by Jeremy Fitzhardinge's avatar Jeremy Fitzhardinge Committed by Jeremy Fitzhardinge
Browse files

xen: add "capabilities" file 



The xenfs capabilities file allows usermode to determine what
capabilities the domain has.  The only one at present is "control_d"
in a privileged domain.

Signed-off-by: default avatarJeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>
parent 6d02c426

drivers/xen/xenfs/super.c

+18 −1
Original line number Diff line number Diff line
@@ -20,10 +20,27 @@ 
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,

};



static int xenfs_fill_super(struct super_block *sb, void *data, int silent)

{

	static struct tree_descr xenfs_files[] = {

		[2] = {"xenbus", &xenbus_file_ops, S_IRUSR|S_IWUSR},

		[1] = {},

		{ "xenbus", &xenbus_file_ops, S_IRUSR|S_IWUSR },

		{ "capabilities", &capabilities_file_ops, S_IRUGO },

		{""},

	};