linux-kernel - Re: [PATCH 15/19] kernfs: split ->kill

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Date:   Mon, 18 Sep 2023 17:24:11 +0200
From:   Michal Koutný <mkoutny@...e.com>
To:     Christoph Hellwig <hch@....de>
Cc:     Christian Brauner <brauner@...nel.org>,
        Al Viro <viro@...iv.linux.org.uk>,
        Heiko Carstens <hca@...ux.ibm.com>,
        Vasily Gorbik <gor@...ux.ibm.com>,
        Alexander Gordeev <agordeev@...ux.ibm.com>,
        Fenghua Yu <fenghua.yu@...el.com>,
        Reinette Chatre <reinette.chatre@...el.com>,
        Miquel Raynal <miquel.raynal@...tlin.com>,
        Richard Weinberger <richard@....at>,
        Vignesh Raghavendra <vigneshr@...com>,
        Dennis Dalessandro <dennis.dalessandro@...nelisnetworks.com>,
        Tejun Heo <tj@...nel.org>,
        Trond Myklebust <trond.myklebust@...merspace.com>,
        Anna Schumaker <anna@...nel.org>,
        Kees Cook <keescook@...omium.org>,
        Damien Le Moal <dlemoal@...nel.org>,
        Naohiro Aota <naohiro.aota@....com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-s390@...r.kernel.org, linux-rdma@...r.kernel.org,
        linux-nfs@...r.kernel.org, linux-hardening@...r.kernel.org,
        cgroups@...r.kernel.org
Subject: Re: [PATCH 15/19] kernfs: split ->kill_sb

On Wed, Sep 13, 2023 at 08:10:09AM -0300, Christoph Hellwig <hch@....de> wrote:
> Split the kernfs_kill_sb helper into helpers for the new split
> shutdown_sb and free_sb methods.  Note that resctrl has very odd
> locking in ->kill_sb, so this commit only releases the locking
> acquired in rdt_shutdown_sb in rdt_free_sb.  This is not very good
> code and relies on ->shutdown_sb and ->free_sb to always be called
> in pairs, which it currently is.  The next commit will try to clean
> this up.
> 
> Signed-off-by: Christoph Hellwig <hch@....de>
> ---
>  arch/x86/kernel/cpu/resctrl/rdtgroup.c | 12 +++++++++---
>  fs/kernfs/mount.c                      | 18 ++++++++----------
>  fs/sysfs/mount.c                       |  7 ++++---
>  include/linux/kernfs.h                 |  5 ++---
>  kernel/cgroup/cgroup.c                 | 10 ++++++----
>  5 files changed, 29 insertions(+), 23 deletions(-)

Reviewed-by: Michal Koutný <mkoutny@...e.com>

(Also, I didn't find a necessity to have kernfs_free_sb(sb) under
rdtgroup_mutex, so folding the following patch of the series may be fine
too.)


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