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From: Richard Weinberger <richard@nod.at>
To: Daniel Golle <daniel@makrotopia.org>
Cc: Jens Axboe <axboe@kernel.dk>,
	Miquel Raynal <miquel.raynal@bootlin.com>,
	Vignesh Raghavendra <vigneshr@ti.com>,
	Davidlohr Bueso <dave@stgolabs.net>,
	Matthew Wilcox <willy@infradead.org>,
	"Martin K. Petersen" <martin.petersen@oracle.com>,
	Chaitanya Kulkarni <kch@nvidia.com>,
	Ming Lei <ming.lei@redhat.com>,
	linux-block <linux-block@vger.kernel.org>,
	linux-kernel <linux-kernel@vger.kernel.org>,
	linux-mtd <linux-mtd@lists.infradead.org>,
	linux-efi <linux-efi@vger.kernel.org>
Subject: Re: [PATCH v4 4/5] mtd_blkdevs: add option to enable scanning for partitions
Date: Thu, 10 Nov 2022 21:12:35 +0100 (CET)	[thread overview]
Message-ID: <871124728.219224.1668111155161.JavaMail.zimbra@nod.at> (raw)
In-Reply-To: <Y21ZXRKJF3hZg8wk@makrotopia.org>

----- Ursprüngliche Mail -----
> On Thu, Nov 10, 2022 at 08:44:53PM +0100, Richard Weinberger wrote:
>> ----- Ursprüngliche Mail -----
>> > Von: "Daniel Golle" <daniel@makrotopia.org>
>> > +
>> > +		if (!IS_ENABLED(CONFIG_MTD_BLOCK_PARTITIONS) || mtd_type_is_nand(new->mtd))
>> > +			gd->flags |= GENHD_FL_NO_PART;
>> 
>> I know that NAND should not get used with mtdblock because lack of wearleveling
>> and
>> in general too many writes. But what exactly is the rationale to deny part
>> scanning for NAND?
> 
> As UBI should be used on NAND, partition scanning should be enabled for
> ubiblock devices to have uImage.FIT filesystem subimages mapped by the
> partition parser.
> 
> If not skipping partition scanning on NAND-backed mtdblock devices the
> scanning itself will already trigger multiple warnings which now happen
> every time when a NAND-backed mtdblock device is being opened since
> commit 96a3295c ("mtdblock: warn if opened on NAND").

I see, you want to promote UBI. Makes sense.
In case you do a v5 series, please add a comment to the code.

Thanks,
//richard

WARNING: multiple messages have this Message-ID (diff)
From: Richard Weinberger <richard@nod.at>
To: Daniel Golle <daniel@makrotopia.org>
Cc: Jens Axboe <axboe@kernel.dk>,
	Miquel Raynal <miquel.raynal@bootlin.com>,
	 Vignesh Raghavendra <vigneshr@ti.com>,
	 Davidlohr Bueso <dave@stgolabs.net>,
	 Matthew Wilcox <willy@infradead.org>,
	 "Martin K. Petersen" <martin.petersen@oracle.com>,
	 Chaitanya Kulkarni <kch@nvidia.com>,
	Ming Lei <ming.lei@redhat.com>,
	 linux-block <linux-block@vger.kernel.org>,
	 linux-kernel <linux-kernel@vger.kernel.org>,
	 linux-mtd <linux-mtd@lists.infradead.org>,
	 linux-efi <linux-efi@vger.kernel.org>
Subject: Re: [PATCH v4 4/5] mtd_blkdevs: add option to enable scanning for partitions
Date: Thu, 10 Nov 2022 21:12:35 +0100 (CET)	[thread overview]
Message-ID: <871124728.219224.1668111155161.JavaMail.zimbra@nod.at> (raw)
In-Reply-To: <Y21ZXRKJF3hZg8wk@makrotopia.org>

----- Ursprüngliche Mail -----
> On Thu, Nov 10, 2022 at 08:44:53PM +0100, Richard Weinberger wrote:
>> ----- Ursprüngliche Mail -----
>> > Von: "Daniel Golle" <daniel@makrotopia.org>
>> > +
>> > +		if (!IS_ENABLED(CONFIG_MTD_BLOCK_PARTITIONS) || mtd_type_is_nand(new->mtd))
>> > +			gd->flags |= GENHD_FL_NO_PART;
>> 
>> I know that NAND should not get used with mtdblock because lack of wearleveling
>> and
>> in general too many writes. But what exactly is the rationale to deny part
>> scanning for NAND?
> 
> As UBI should be used on NAND, partition scanning should be enabled for
> ubiblock devices to have uImage.FIT filesystem subimages mapped by the
> partition parser.
> 
> If not skipping partition scanning on NAND-backed mtdblock devices the
> scanning itself will already trigger multiple warnings which now happen
> every time when a NAND-backed mtdblock device is being opened since
> commit 96a3295c ("mtdblock: warn if opened on NAND").

I see, you want to promote UBI. Makes sense.
In case you do a v5 series, please add a comment to the code.

Thanks,
//richard

______________________________________________________
Linux MTD discussion mailing list
http://lists.infradead.org/mailman/listinfo/linux-mtd/

  reply	other threads:[~2022-11-10 20:12 UTC|newest]

Thread overview: 14+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2022-11-08 23:04 [PATCH v4 4/5] mtd_blkdevs: add option to enable scanning for partitions Daniel Golle
2022-11-08 23:04 ` Daniel Golle
2022-11-09 12:45 ` Miquel Raynal
2022-11-09 12:45   ` Miquel Raynal
2022-11-09 13:10   ` Daniel Golle
2022-11-09 13:10     ` Daniel Golle
2022-11-10 19:44 ` Richard Weinberger
2022-11-10 19:44   ` Richard Weinberger
2022-11-10 20:04   ` Daniel Golle
2022-11-10 20:04     ` Daniel Golle
2022-11-10 20:12     ` Richard Weinberger [this message]
2022-11-10 20:12       ` Richard Weinberger
2022-11-11  0:39       ` Daniel Golle
2022-11-11  0:39         ` Daniel Golle

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