From: Theodore Tso <tytso@MIT.EDU>
To: Mingming Cao <cmm@us.ibm.com>
Cc: "Aneesh Kumar K.V" <aneesh.kumar@linux.vnet.ibm.com>,
linux-ext4@vger.kernel.org
Subject: Re: [RFC PATCH] ext4: Use page_mkwrite vma_operations to get mmap write notification.
Date: Wed, 5 Mar 2008 18:59:41 -0500 [thread overview]
Message-ID: <20080305235941.GD18188@mit.edu> (raw)
In-Reply-To: <1204760238.3713.4.camel@localhost.localdomain>
On Wed, Mar 05, 2008 at 03:37:18PM -0800, Mingming Cao wrote:
> On Wed, 2008-03-05 at 18:29 -0500, Theodore Tso wrote:
> > On Tue, Mar 04, 2008 at 04:45:51PM -0800, Mingming Cao wrote:
> > > > + /* FIXME!! should we take inode->i_mutex ? Currently we can't because
> > > > + * it has a circular locking dependency with DIO. But migrate expect
> > > > + * i_mutex to ensure no i_data changes
> >
> > Should I worry that we have something in the stable part of the patch
> > queue with this FIXME!! comment? :-)
> >
>
> I think this comment could be moved to the migration.c. We can't take
> i_mutex on mapped IO path. The i_data_mutex is the lock that should
> protect the i_data concurrent changes, which is currently mapped IO
> used. The race with migration could be addressed in migration instead of
> here. I propose we drop this comment for now.
OK, but that still means we have a known bug in the migration code,
which is in mainline....
- Ted
next prev parent reply other threads:[~2008-03-05 23:59 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-03-04 12:42 [RFC PATCH] ext4: Use page_mkwrite vma_operations to get mmap write notification Aneesh Kumar K.V
2008-03-05 0:45 ` Mingming Cao
2008-03-05 23:29 ` Theodore Tso
2008-03-05 23:37 ` Mingming Cao
2008-03-05 23:59 ` Theodore Tso [this message]
-- strict thread matches above, loose matches on Subject: below --
2008-02-28 18:05 [RFC][PATCH] " Aneesh Kumar K.V
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