linux-kernel - Re: [PATCH 10/19] USB: gadget/legacy: remove sb

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Date:   Tue, 26 Sep 2023 11:24:27 +0200
From:   Christoph Hellwig <hch@....de>
To:     Alan Stern <stern@...land.harvard.edu>
Cc:     Christoph Hellwig <hch@....de>,
        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 10/19] USB: gadget/legacy: remove sb_mutex

On Wed, Sep 13, 2023 at 12:10:56PM -0400, Alan Stern wrote:
> On Wed, Sep 13, 2023 at 08:10:04AM -0300, Christoph Hellwig wrote:
> > Creating new a new super_block vs freeing the old one for single instance
> > file systems is serialized by the wait for SB_DEAD.
> > 
> > Remove the superfluous sb_mutex.
> > 
> > Signed-off-by: Christoph Hellwig <hch@....de>
> > ---
> 
> You might mention that this is essentially a reversion of commit 
> d18dcfe9860e ("USB: gadgetfs: Fix race between mounting and 
> unmounting").

The difference we have now is that sb creation waits for the
old one to go way, but I'll add a notice on all that.