Messages in this thread | | | Subject | Re: [PATCH] UBI: flush wl before clearing update marker | From | Artem Bityutskiy <> | Date | Fri, 04 Dec 2009 07:42:28 +0200 |
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On Fri, 2009-12-04 at 02:58 +0100, ext Greg KH wrote: > On Thu, Dec 03, 2009 at 09:01:45AM +0200, Artem Bityutskiy wrote: > > On Wed, 2009-12-02 at 16:42 +0100, ext Greg KH wrote: > > > On Wed, Dec 02, 2009 at 08:48:43AM +0200, Artem Bityutskiy wrote: > > > > From: Sebastian Andrzej Siewior <sebastian@breakpoint.cc> > > > > > > > > ubiupdatevol -t does the following: > > > > - ubi_start_update() > > > > - set_update_marker() > > > > - for all LEBs ubi_eba_unmap_leb() > > > > - clear_update_marker() > > > > - ubi_wl_flush() > > > > > > > > ubi_wl_flush() physically erases all PEB, once it returns all PEBs are > > > > empty. clear_update_marker() has the update marker written after return. > > > > If there is a power cut between the last two functions then the UBI > > > > volume has no longer the "update" marker set and may have some valid > > > > LEBs while some of them may be gone. > > > > If that volume in question happens to be a UBIFS volume, then mount > > > > will fail with > > > > > > > > |UBIFS error (pid 1361): ubifs_read_node: bad node type (255 but expected 6) > > > > |UBIFS error (pid 1361): ubifs_read_node: bad node at LEB 0:0 > > > > |Not a node, first 24 bytes: > > > > |00000000: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff > > > > > > > > if there is at least one valid LEB and the wear-leveling worker managed > > > > to clear LEB 0. > > > > > > > > The patch waits for the wl worker to finish prior clearing the "update" > > > > marker on flash. The two new LEB which are scheduled for erasing after > > > > clear_update_marker() should not matter because they are only visible to > > > > UBI. > > > > > > > > Signed-off-by: Sebastian Andrzej Siewior <sebastian@breakpoint.cc> > > > > Signed-off-by: Artem Bityutskiy <Artem.Bityutskiy@nokia.com> > > > > Cc: stable@kernel.org > > > > Cc: linux-kernel@vger.kernel.org > > > > --- > > > > drivers/mtd/ubi/upd.c | 20 +++++++++++--------- > > > > > > > > > I'm not the mtd or ubi maintainer, so why did you send this to me? > > > > Sorry, I thought the protocol to get to -stable is to send to you and CC > > stable. I maintain UBI and just wanted to send this patch to -stable. I > > googled a bit and could not find the right way. > > Look in the Documentation/stable_kernel_rules.txt that shows all you > need is the Cc: stable@kernel.org section in the Signed-off-by area like > you did. > > So when this goes into Linus's tree, I'll automatically get it in the > right inbox and know to apply it to the -stable tree.
Oh, thanks a lot!
-- Best Regards, Artem Bityutskiy (Артём Битюцкий)
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