Commit-ID: 818fd20673df82031e604bb784d836f1fc2e2451
Gitweb: http://git.kernel.org/tip/818fd20673df82031e604bb784d836f1fc2e2451
Author: Jeremy Fitzhardinge <jeremy@xxxxxxxx>
AuthorDate: Fri, 6 Feb 2009 18:46:47 -0800
Committer: Jeremy Fitzhardinge <jeremy.fitzhardinge@xxxxxxxxxx>
CommitDate: Mon, 30 Mar 2009 09:59:20 -0700
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: Jeremy Fitzhardinge <jeremy.fitzhardinge@xxxxxxxxxx>
---
drivers/xen/xenfs/super.c | 19 ++++++++++++++++++-
1 files changed, 18 insertions(+), 1 deletions(-)
diff --git a/drivers/xen/xenfs/super.c b/drivers/xen/xenfs/super.c
index 515741a..6559e0c 100644
--- a/drivers/xen/xenfs/super.c
+++ b/drivers/xen/xenfs/super.c
@@ -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 },
{""},
};
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