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Message-ID: <vqax7efvf5h4agxge5g43pdl6tsa5on5mob74bydydd5vdxwb5@5fj2qgmuxjj3>
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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