On Saturday 05 April 2008, Rusty Russell wrote:
> +asmlinkage long sys_vringfd(void __user *addr,
> + unsigned num_descs,
> + u16 __user *last_used)
> +{
> + int fd, err;
> + struct file *filp;
> + struct vring_info *vr;
> +
> + /* Must be a power of two, and representable by u16 */
> + if (!num_descs || (num_descs & (num_descs-1)) || num_descs > 65536) {
> + err = -EINVAL;
> + goto out;
> + }
> +
> + fd = get_unused_fd();
> + if (fd < 0) {
> + err = fd;
> + goto out;
> + }
> +
> + filp = alloc_file(vring_mnt, dget(vring_mnt->mnt_root), FMODE_WRITE,
> + &vring_fops);
> + if (!filp) {
> + err = -ENFILE;
> + goto put_fd;
> + }
This looks like a candidate for anon_inode_getfd(), which would let you
get rid of the code for registering your own file system.
Arnd <><
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