On Fri, Aug 12, 2011 at 02:14:15PM +0200, Jan Schmidt wrote:
> (1) Normally, requests to the file system go through ioctls (on the fd
> of the mountpoint) and the result is small enough to be returned when
> the ioctl finishes. That said, I thought of passing a user land fd along
> with this ioctl to the kernel and make it dump the generated bits there.
> Only, I don't see how to turn a fd into a struct file pointer. And I
> don't know if that would be considered really ugly by a lot of people.
struct file *filp = fget(fd);
...
fput(filp);
That said, why not have the ioctl mutate the existing fd?
ie in userspace:
int fd = open("/mnt/btrfs");
ioctl(fd, BTRFS_IOC_STREAM);
while (...) {
read(fd, buf, 4096);
...
}
close(fd);
--
Matthew Wilcox Intel Open Source Technology Centre
"Bill, look, we understand that you're interested in selling us this
operating system, but compare it to ours. We can't possibly take such
a retrograde step."
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