Re: [RFC PATCH v2] fs/namespace: use percpu_rw_semaphore for writer holding

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To: Sebastian Andrzej Siewior <bigeasy@xxxxxxxxxxxxx>
Subject: Re: [RFC PATCH v2] fs/namespace: use percpu_rw_semaphore for writer holding
From: Al Viro <viro@xxxxxxxxxxxxxxxxxx>
Date: Sun, 19 Jul 2020 02:49:54 +0100
Cc: linux-fsdevel@xxxxxxxxxxxxxxx, linux-kernel@xxxxxxxxxxxxxxx, John Ogness <john.ogness@xxxxxxxxxxxxx>, Thomas Gleixner <tglx@xxxxxxxxxxxxx>, Peter Zijlstra <peterz@xxxxxxxxxxxxx>
In-reply-to: <20200702154646.qkrzchuttrywvuud@linutronix.de>

On Thu, Jul 02, 2020 at 05:46:46PM +0200, Sebastian Andrzej Siewior wrote:

> The MNT_WRITE_HOLD flag is used to manually implement a rwsem.

Could you show me where does it currently sleep?  Your version does,
unless I'm misreading it...

Follow-Ups:
- Re: [RFC PATCH v2] fs/namespace: use percpu_rw_semaphore for writer holding
  - From: John Ogness

References:
- [RFC PATCH v2] fs/namespace: use percpu_rw_semaphore for writer holding
  - From: Sebastian Andrzej Siewior

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