[Bug 11941] losetup and partprobe fail when partitions exist

[bugzilla at busybox.net]

https://bugs.busybox.net/show_bug.cgi?id=11941

Denys Vlasenko <vda.linux at googlemail.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
         Resolution|---                         |FIXED

--- Comment #3 from Denys Vlasenko <vda.linux at googlemail.com> ---
losetup -P was implemented this May.

This does not solve partprobe / blockdev --rereadpt examples (in busybox, they
both boil down to calling ioctl(BLKRRPART)) - from what I see in strace,
partprobe from GNU parted 3.2 does not use this ioctl at all, it does some
complicated magic with newer APIs designed to set up arbitrary pertitioning
schemes from userspace without having kernel to know anything about partition
tables.

"blockdev --rereadpt" does not work for util-linux's blockdev as well, since it
also simply calls ioctl(BLKRRPART).

IOW: "losetup -P" issue is fixed, "extend partprobe" issue is a significantly
taller order.

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