Kernel Bug Tracker – Bug 16334
reiserfs locking (v2)
Last modified: 2013-12-10 21:48:04 UTC
Subject : reiserfs locking (v2)
Submitter : Sergey Senozhatsky <email@example.com>
Date : 2010-07-02 9:34
Message-ID : 20100702093451.GA3973@swordfish.minsk.epam.com
References : http://marc.info/?l=linux-kernel&m=127806306303590&w=2
This entry is being used for tracking a regression from 2.6.34. Please don't
close it until the problem is fixed in the mainline.
On Friday, July 09, 2010, Frederic Weisbecker wrote:
> On Thu, Jul 08, 2010 at 06:34:25PM -0700, Linus Torvalds wrote:
> > On Thu, Jul 8, 2010 at 4:33 PM, Rafael J. Wysocki <firstname.lastname@example.org> wrote:
> > > Bug-Entry : http://bugzilla.kernel.org/show_bug.cgi?id=16334
> > > Subject : reiserfs locking (v2)
> > > Submitter : Sergey Senozhatsky <email@example.com>
> > > Date : 2010-07-02 9:34 (7 days old)
> > > Message-ID : <20100702093451.GA3973@swordfish.minsk.epam.com>
> > > References : http://marc.info/?l=linux-kernel&m=127806306303590&w=2
> > Frederic? Al? I assume this is some late fallout from the BKL removal
> > ages ago.. It's the old filldir-vs-mmap crud, but normally it should
> > be impossible to trigger because the inode for a directory should
> > never be mmap'able, so we should never have the same i_mutex lock used
> > for both mmap and for filldir protection.
> > We saw some of that oddity long ago, I wonder if it's lockdep being
> > confused about some inodes.
> I think it has been there from the beginning. At least it was there before
> the reiserfs bkl removal in .32.
> Indeed the readdir <-> unmap/release inversion problem can not happen.
> But Al said that can happen between write and release. (Although I don't see
> where write takes the inode mutex).
> He also highlighted the fact that reiserfs refcounting based on i_count
> was totally broken.
> He has a fix the whole in the vfs tree, in the for-next branch on commit
> "Fix reiserfs_file_release()"
> No more uses of the i_mutex on release after that, nor i_count, but a private
> openers refcount and a tailpack mutex per reiserfs inode.
Not a recent regression, dropping from the list.
*** Bug 15805 has been marked as a duplicate of this bug. ***