linux-kernel - Re: [PATCH 15/13] sysfs: Protect sysfs_refresh

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Date:	Wed, 04 Nov 2009 12:51:03 -0800
From:	ebiederm@...ssion.com (Eric W. Biederman)
To:	"Serge E. Hallyn" <serue@...ibm.com>
Cc:	Greg Kroah-Hartman <gregkh@...e.de>,
	Kay Sievers <kay.sievers@...y.org>, Greg KH <greg@...ah.com>,
	linux-kernel@...r.kernel.org, Tejun Heo <tj@...nel.org>,
	Cornelia Huck <cornelia.huck@...ibm.com>,
	linux-fsdevel@...r.kernel.org,
	Eric Dumazet <eric.dumazet@...il.com>,
	Benjamin LaHaise <bcrl@...et.ca>
Subject: Re: [PATCH 15/13] sysfs: Protect sysfs_refresh_inode with inode mutex.

"Serge E. Hallyn" <serue@...ibm.com> writes:

> Quoting Eric W. Biederman (ebiederm@...ssion.com):
>> 
>> In general everything that writes to vfs inodes holds the
>> inode mutex, so hold the inode mutex over sysfs_refresh_inode.
>> The sysfs data structures don't need this but it looks like the
>> vfs might.
>> 
>> Signed-off-by: Eric W. Biederman <ebiederm@...stanetworks.com>
>
> Oh right so pls disregard my last reply to patch 9 :)

I also checked and nfs has the same basic structure and does take the
inode mutex on these paths, inside of nfs_refresh_inode which is
called from __nfs_revalidate_inode.

So it is definitely the consistent thing to do.

Eric
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