diff options
| author |   Jeremy Fitzhardinge <jeremy@goop.org> | 2009-02-06 18:46:47 -0800 |
|---|---|---|
| committer |   Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com> | 2009-03-30 09:59:20 -0700 |
| commit | 818fd20673df82031e604bb784d836f1fc2e2451 (patch) | |
| tree | 2517bba7961d62b650003fbf7e049f446bd9c3a1 /drivers/xen | |
| parent | xen: clean up gate trap/interrupt constants (diff) | |
| download | linux-dev-818fd20673df82031e604bb784d836f1fc2e2451.tar.xz linux-dev-818fd20673df82031e604bb784d836f1fc2e2451.zip | |
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@citrix.com>
Diffstat (limited to 'drivers/xen')
| -rw-r--r-- | 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 515741a8e6b8..6559e0c752ce 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 }, {""}, }; |