linux-kernel - Re: [PATCH v3 0/4] fs/9p: fix mmap regression

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Date:   Mon, 24 Jul 2023 16:39:41 -0500
From:   Eric Van Hensbergen <ericvh@...nel.org>
To:     Robert Schwebel <r.schwebel@...gutronix.de>
Cc:     Latchesar Ionkov <lucho@...kov.net>,
        Dominique Martinet <asmadeus@...ewreck.org>,
        Christian Schoenebeck <linux_oss@...debyte.com>,
        v9fs@...ts.linux.dev, linux-kernel@...r.kernel.org,
        stable@...r.kernel.org, kernel@...gutronix.de
Subject: Re: [PATCH v3 0/4] fs/9p: fix mmap regression

Awesome, thanks for verifying Robert.  Will send a pull request for
this in a few days.

      -eric

On Mon, Jul 24, 2023 at 4:17 PM Robert Schwebel
<r.schwebel@...gutronix.de> wrote:
>
> Hi Eric,
>
> On Wed, Jul 19, 2023 at 03:17:04PM +0000, Eric Van Hensbergen wrote:
> > This series attempts to fix a reported exception with mmap
> > on newer kernels.
> >
> > Fixes: 1543b4c5071c ("fs/9p: remove writeback fid and fix per-file modes")
> > Link: https://lore.kernel.org/v9fs/ZK25XZ%2BGpR3KHIB%2F@pengutronix.de/
> > Reported-by: Robert Schwebel <r.schwebel@...gutronix.de>
> > Signed-off-by: Eric Van Hensbergen <ericvh@...nel.org>
> > ---
> > Changes in v3:
> > - Clarify debug print to read-only mmap mode versus no mmap mode in
> >   v9fs_file_mmap
> > - Fix suggested regression tags and propagate across series
> > - Link to v2: https://lore.kernel.org/r/20230716-fixes-overly-restrictive-mmap-v2-0-147d6b93f699@kernel.org
> >
> > Changes in v2:
> > - fix requested changes in commit messages
> > - add patch to remove unnecessary invalidate_inode_pages in mmap readonly path
> > - Link to v1: https://lore.kernel.org/r/20230716-fixes-overly-restrictive-mmap-v1-0-0683b283b932@kernel.org
>
> I've tested this patch series with my qemu setup and it resolves the
> issue. Thanks for taking care!
>
> Tested-by: Robert Schwebel <r.schwebel@...gutronix.de>
>
> ----------8<----------
>
> rsc@...e05:~/work/DistroKit$ configs/platform-v7a/run
> Forwarding SSH port 127.0.0.1:24910 -> qemu:22
> [    0.000000] L2C: platform modifies aux control register: 0x02020000 -> 0x02420000
> [    0.000000] L2C: DT/platform modifies aux control register: 0x02020000 -> 0x02420000
> [    0.004896] smp_twd: clock not found -2
> [    0.726397] simple-pm-bus bus@...00000:motherboard-bus@...00000:iofpga@7,00000000: Failed to create device link (0x180) with dcc:tcrefclk
> [    0.742338] simple-pm-bus bus@...00000:motherboard-bus@...00000:iofpga@7,00000000: Failed to create device link (0x180) with dcc:tcrefclk
> [    0.809910] physmap-flash 48000000.psram: map_probe failed
> [    1.201306] 9pnet_virtio: no channels available for device root
>
>  ____                        _                   _
> |  _ \ ___ _ __   __ _ _   _| |_ _ __ ___  _ __ (_)_  __
> | |_) / _ \ '_ \ / _` | | | | __| '__/ _ \| '_ \| \ \/ /
> |  __/  __/ | | | (_| | |_| | |_| | | (_) | | | | |>  <
> |_|   \___|_| |_|\__, |\__,_|\__|_|  \___/|_| |_|_/_/\_\
>                  |___/
>
>  ____  _     _             _  ___ _
> |  _ \(_)___| |_ _ __ ___ | |/ (_) |_
> | | | | / __| __| '__/ _ \| ' /| | __|
> | |_| | \__ \ |_| | | (_) | . \| | |_
> |____/|_|___/\__|_|  \___/|_|\_\_|\__|
>
>
> OSELAS(R)-DistroKit-2019.12.0-00429-g57ffae760eb9 / v7a-2019.12.0-00429-g57ffae760eb9
> ptxdist-2023.07.1/2023-07-11T19:56:50+0200
>
> DistroKit login: root
> root@...troKit:~ mount / -o remount,rw
> root@...troKit:~ ldconfig
> root@...troKit:~ uname -a
> Linux DistroKit 6.4.0 #1 SMP PREEMPT 2023-07-01T00:00:00+00:00 armv7l GNU/Linux
>
> ----------8<----------
>
> rsc
> --
> Pengutronix e.K.                           | Dipl.-Ing. Robert Schwebel  |
> Steuerwalder Str. 21                       | https://www.pengutronix.de/ |
> 31137 Hildesheim, Germany                  | Phone: +49-5121-206917-0    |
> Amtsgericht Hildesheim, HRA 2686           | Fax:   +49-5121-206917-9    |
>