ACK: [PATCH][SRU][BIONIC] UBUNTU: SAUCE: (noup) Update zfs to 0.7.5-1ubuntu16.6

[Andrea Righi]

On Thu, May 30, 2019 at 01:57:56PM +0100, Colin King wrote:
> From: Colin Ian King <colin.king at canonical.com>
> 
> https://bugs.launchpad.net/bugs/1772412
> 
> Sync from zfs 0.7.5-1ubuntu16.6 that contains a backport of upstream zfs
> commit 77d8a0f1a4d0b2f59cee63088f7987cb38e66538 ("Fix hung z_zvol tasks
> during 'zfs receive'").
> 
> Adds a dedicated, per-pool, prefetch taskq to prevent the traverse
> code from monopolizing the global (and limited) system_taskq by
> inappropriately scheduling long running tasks on it. This fixes
> z_zvol hung tasks when performing large I/O operations, for example
> when performing huge ZFS send/receives (on slow media).
> 
> Signed-off-by: Colin Ian King <colin.king at canonical.com>

It's a small fix, clean upstream cherry-pick (minor offset changes), all
good to me.

Acked-by: Andrea Righi <andrea.righi at canonical.com>