Re: [PATCH] task_work: add a scheduling point in task_work_run()

[Al Viro]

On Wed, Aug 22, 2012 at 01:27:21PM +0800, Michael Wang wrote:

> And can we make sure that it is safe to sleep(schedule) at this point?
> It may need some totally testing to cover all the situation...

task_work callback can bloody well block, so yes, it is safe.  Hell,
we are doing final close from that; that can lead to any amount of
IO, up to and including on-disk file freeing and, in case of vfsmount
kept alive by an opened file after we'd done umount -l, actual final
unmount of a filesystem.  That can more than just block, that can block
for a long time if that's a network filesystem...
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