linux-kernel - Re: [PATCH 2/2] vfs: grab the lock instead of blocking in __fd

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Message-ID: <CANn89iLNATFw_q2KVsmCq+gtu3LbJ6mz-5JqgrNnwvsZUz5D+g@mail.gmail.com>
Date:   Tue, 3 Oct 2017 07:41:11 -0700
From:   Eric Dumazet <edumazet@...gle.com>
To:     Mateusz Guzik <mguzik@...hat.com>
Cc:     Al Viro <viro@...iv.linux.org.uk>, mszeredi@...hat.com,
        linux-fsdevel@...r.kernel.org, LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 2/2] vfs: grab the lock instead of blocking in
 __fd_install during resizing

On Tue, Oct 3, 2017 at 3:58 AM, Mateusz Guzik <mguzik@...hat.com> wrote:
> Explicit locking in the fallback case provides a safe state of the
> table. Getting rid of blocking semantics makes __fd_install usable
> again in non-sleepable contexts, which easies backporting efforts.
>
> There is a side effect of slightly nicer assembly for the common case
> as might_sleep can now be removed.
>
> Signed-off-by: Mateusz Guzik <mguzik@...hat.com>
> ---
>  Documentation/filesystems/porting |  4 ----
>  fs/file.c                         | 11 +++++++----
>  2 files changed, 7 insertions(+), 8 deletions(-)

Nice change !

Reviewed-by: Eric Dumazet <edumazet@...gle.com>