Re: [PATCH v2 6/8] bdev: add open_finish.

From: Michal Suchánek
Date: Thu Nov 21 2019 - 05:15:37 EST


On Thu, Oct 24, 2019 at 06:12:54AM -0700, Matthew Wilcox wrote:
> On Thu, Oct 24, 2019 at 10:55:14AM +0200, Michal Suchánek wrote:
> > On Wed, Oct 23, 2019 at 07:22:32PM -0700, Christoph Hellwig wrote:
> > > On Wed, Oct 23, 2019 at 02:52:45PM +0200, Michal Suchanek wrote:
> > > > Opening a block device may require a long operation such as waiting for
> > > > the cdrom tray to close. Performing this operation with locks held locks
> > > > out other attempts to open the device. These processes waiting to open
> > > > the device are not killable.
>
> You can use mutex_lock_killable() to fix that.
>
That fixes only half of the problem.

Other processes still cannot access the device while you wait on
mutex_lock_killable

Thanks

Michal