[LTP] [PATCH 1/1] loop: Fix occasional uevent drop

[Christoph Hellwig]

On Wed, Nov 11, 2020 at 07:08:46PM +0100, Petr Vorel wrote:
> 716ad0986cbd caused to occasional drop of loop device uevent, which was
> no longer triggered in loop_set_size() but in a different part of code.
> 
> Bug is reproducible with LTP test uevent01 [1]:
> 
> i=0; while true; do
>     i=$((i+1)); echo "== $i =="
>     lsmod |grep -q loop && rmmod -f loop
>     ./uevent01 || break
> done
> 
> Put back triggering through code called in loop_set_size().
> 
> Fix required to add yet another parameter to
> set_capacity_revalidate_and_notify().

I don't like where this is heading, especially as I've rewritten the whole
area pending inclusion for 5.11. I think the you want something like what
I did in this three commits with a loop commit equivalent to the last
commit for nbd:

http://git.infradead.org/users/hch/block.git/commitdiff/89348f9f510d77d0bf69994f096eb6b71199e0f4

http://git.infradead.org/users/hch/block.git/commitdiff/89348f9f510d77d0bf69994f096eb6b71199e0f4

Jens, maybe I should rebase things so that a version of that first
commit can go into 5.10 and stable?