On Thu, Jul 12, 2018 at 07:15:05PM +0200, Greg KH wrote:
> On Tue, Jul 10, 2018 at 11:44:09PM +0100, David Howells wrote:
> > Provide an fsopen() system call that starts the process of preparing to
> > create a superblock that will then be mountable, using an fd as a context
> > handle. fsopen() is given the name of the filesystem that will be used:
> >
> > int mfd = fsopen(const char *fsname, unsigned int flags);
> >
> > where flags can be 0 or FSOPEN_CLOEXEC.
> >
> > For example:
> >
> > sfd = fsopen("ext4", FSOPEN_CLOEXEC);
> > write(sfd, "s /dev/sdb1"); // note I'm ignoring write's length arg
> > write(sfd, "o noatime");
> > write(sfd, "o acl");
> > write(sfd, "o user_attr");
> > write(sfd, "o iversion");
> > write(sfd, "o ");
> > write(sfd, "r /my/container"); // root inside the fs
> > write(sfd, "x create"); // create the superblock
>
> Ugh, creating configfs again in a syscall form? I know people love
> file descriptors, but can't you do this with a configfs entry instead if
> you really want to do this type of thing from userspace in this type of
> "style"?
>
> Why reinvent the wheel again?
The damn thing REALLY, REALLY depends upon the fs type. How would
you map it on configfs?
