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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>
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6d02c42698
commit
818fd20673
@ -20,10 +20,27 @@
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MODULE_DESCRIPTION("Xen filesystem");
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MODULE_LICENSE("GPL");
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static ssize_t capabilities_read(struct file *file, char __user *buf,
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size_t size, loff_t *off)
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{
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char *tmp = "";
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if (xen_initial_domain())
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tmp = "control_d\n";
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return simple_read_from_buffer(buf, size, off, tmp, strlen(tmp));
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}
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static const struct file_operations capabilities_file_ops = {
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.read = capabilities_read,
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};
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static int xenfs_fill_super(struct super_block *sb, void *data, int silent)
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{
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static struct tree_descr xenfs_files[] = {
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[2] = {"xenbus", &xenbus_file_ops, S_IRUSR|S_IWUSR},
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[1] = {},
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{ "xenbus", &xenbus_file_ops, S_IRUSR|S_IWUSR },
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{ "capabilities", &capabilities_file_ops, S_IRUGO },
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{""},
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};
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