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    Subject[PATCH 18/24] xen: add "capabilities" file
    Date
    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>
    ---
    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 },
    {""},
    };

    --
    1.6.0.6


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