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SubjectRe: [PATCH v2] acct: fix possible deadlock in acct_pin_kill
On Thu, Apr 04, 2019 at 07:44:48PM +0100, Al Viro wrote:

> Huh? sb_writers is taken when we *open* the new file. Then we replace
> its ->path.mnt with a clone and transfer the write count from the original
> to new one. And close the old file while we are at it.
>
> >From sb_writers POV mainline has
> sb_start_write(new_sb) // in open
> sb_start_write(new_sb) // mnt_want_write() on clone
> last write to old_sb, then sb_end_write(old_sb) // acct_pin_kill()
> sb_end_write(new_sb) // mnt_drop_write(mnt)
> and you flip the order of the last two lines.
>
> Could you explain how exactly does your patch help whatever
> problem overlayfs has?

Ow... Sorry, -ENOCOFFEE...

Let me wake up properly and look at that thing again.

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