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From: Richard Weinberger <richard@nod.at>
To: dedekind1@gmail.com
Cc: linux-mtd@lists.infradead.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH 3/4] UBI: Fastmap: Care about the protection queue
Date: Mon, 20 Oct 2014 18:17:13 +0200	[thread overview]
Message-ID: <54453589.50507@nod.at> (raw)
In-Reply-To: <1413821350.7906.392.camel@sauron.fi.intel.com>

Am 20.10.2014 um 18:09 schrieb Artem Bityutskiy:
> On Mon, 2014-10-20 at 17:59 +0200, Richard Weinberger wrote:
>>> Also, say, PEB X is in the work queue waiting for erasure. Fastmap comes
>>> along and saves it as "must be erased" in the fastmap. Fastmap finishes
>>> its job, PEB X gets erased, and I write my data there, so PEB X is
>>> referred to by LEB Y. Now I have power cut. Then I attach the flash
>>> again. Surely it is not that fastmap just erases PEB X and I lose the
>>> contents of LEB Y?
>>
>> This cannot happen. If X is erased you cannot write data do it. I must first go
>> thought the pool and the pool is scanned while attaching.
> 
> Just noticed from the code that we first add PEBs to the erase list, and
> then we go an scan the pools.

In the attach code, yes. But this does not matter.
It cannot happen that a fastmap is written with a PEB being in a pool
and the erase job list.

If you figure out such a state, please tell me. I'll fix it. :-)

Thanks,
//richard

  reply	other threads:[~2014-10-20 16:17 UTC|newest]

Thread overview: 45+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2014-09-29 22:20 UBI: Fastmap fixes - round one Richard Weinberger
2014-09-29 22:20 ` [PATCH 1/4] UBI: Ensure that all fastmap work is done upon WL shutdown Richard Weinberger
2014-09-30  6:26   ` Artem Bityutskiy
2014-09-30  6:58     ` Richard Weinberger
2014-09-30  7:53       ` Bityutskiy, Artem
2014-09-30  8:07         ` Richard Weinberger
2014-10-03 12:52           ` Artem Bityutskiy
2014-10-02 13:05   ` Tanya Brokhman
2014-10-02 13:18     ` Richard Weinberger
2014-09-29 22:20 ` [PATCH 2/4] UBI: Fastmap: Calc fastmap size correctly Richard Weinberger
2014-10-02 13:14   ` Tanya Brokhman
2014-10-02 13:18     ` Richard Weinberger
2014-10-02 14:04   ` Tanya Brokhman
2014-10-03 14:38   ` Artem Bityutskiy
2014-09-29 22:20 ` [PATCH 3/4] UBI: Fastmap: Care about the protection queue Richard Weinberger
2014-10-02 13:28   ` Tanya Brokhman
2014-10-02 13:32     ` Richard Weinberger
2014-10-02 14:14       ` Tanya Brokhman
2014-10-03 14:31   ` Artem Bityutskiy
2014-10-03 19:06     ` Richard Weinberger
2014-10-13 13:17       ` Artem Bityutskiy
2014-10-13 14:30         ` Richard Weinberger
2014-10-13 15:23           ` Artem Bityutskiy
2014-10-13 15:28             ` Bityutskiy, Artem
2014-10-13 21:04             ` Richard Weinberger
2014-10-14 10:23               ` Artem Bityutskiy
2014-10-14 12:21                 ` Tanya Brokhman
2014-10-14 13:02                   ` Artem Bityutskiy
2014-10-14 13:35                     ` Tanya Brokhman
2014-10-16 10:06                 ` Richard Weinberger
2014-10-16 10:15                   ` Artem Bityutskiy
2014-10-16 11:07                     ` Richard Weinberger
2014-10-20 14:46                   ` Artem Bityutskiy
2014-10-20 15:17                     ` Richard Weinberger
2014-10-20 15:40                       ` Artem Bityutskiy
2014-10-20 15:59                         ` Richard Weinberger
2014-10-20 16:09                           ` Artem Bityutskiy
2014-10-20 16:17                             ` Richard Weinberger [this message]
2014-10-20 20:46                         ` Richard Weinberger
2014-09-29 22:20 ` [PATCH 4/4] UBI: Fastmap: Ensure that only one fastmap work is scheduled Richard Weinberger
2014-09-30  6:45   ` Bityutskiy, Artem
2014-09-30  6:59     ` Richard Weinberger
2014-09-30  7:39       ` Bityutskiy, Artem
2014-09-30  7:44         ` Richard Weinberger
2014-10-02 14:22           ` Tanya Brokhman

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