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From: Richard Weinberger <richard@nod.at>
To: Miquel Raynal <miquel.raynal@bootlin.com>
Cc: Boris Brezillon <boris.brezillon@collabora.com>,
	linux-mtd <linux-mtd@lists.infradead.org>,
	Vignesh Raghavendra <vigneshr@ti.com>,
	Thomas Petazzoni <thomas.petazzoni@bootlin.com>,
	Tudor Ambarus <Tudor.Ambarus@microchip.com>
Subject: Re: [PATCH v2] mtd: implement proper partition handling
Date: Thu, 9 Jan 2020 19:43:04 +0100 (CET)	[thread overview]
Message-ID: <1737779363.17836.1578595384783.JavaMail.zimbra@nod.at> (raw)
In-Reply-To: <20200109191304.636c82e7@xps13>

Miquel,

----- Ursprüngliche Mail -----
>> What problem does this solve?
>> ...beside of a nice diffstat which removes more than it adds. :-)
> 
> It is much easier to escalade to the top most "master" device when
> there are multiple levels of partitioning, which was not cleanly
> described IMHO. Also it is already used in the MLC-in-pseudo-SLC-mode
> series :)

Ok. In fact I "found" this patch my looking at the SLC emulation patches.

>> > +static inline struct mtd_info *mtd_get_master(struct mtd_info *mtd)
>> > +{
>> > +	while (mtd->parent)
>> > +		mtd = mtd->parent;
>> > +
>> > +	return mtd;
>> > +}
>> 
>> So, parent == master?
> 
> top most parent (the one without parent) == master !
> 
>> 
>> When I create a MTD ontop of UBI using gluebi, who will be parent/master?
> 
> I don't really understand the issue here?

Let's say I have mtd0 with an ubi and a volume "xxx". After enabling
gluebi a new mtd1 will arrive on the system.
The stacking is mtd0 -> ubi (volume xxx) -> mtd1.
Is now a relationship between mtd1 and mtd0?

I'd expect mtd1's parent being mtd0.

Thanks,
//richard

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  reply	other threads:[~2020-01-09 18:43 UTC|newest]

Thread overview: 11+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-12-30 11:19 [PATCH v2] mtd: implement proper partition handling Miquel Raynal
2020-01-08 23:34 ` Richard Weinberger
2020-01-09 18:13   ` Miquel Raynal
2020-01-09 18:43     ` Richard Weinberger [this message]
2020-01-09 18:45       ` Miquel Raynal
2020-01-09 19:13         ` Boris Brezillon
2020-01-09 19:23           ` Miquel Raynal
2020-01-09 19:37             ` Boris Brezillon
2020-01-10  8:28               ` Miquel Raynal
2020-01-10  9:46                 ` Boris Brezillon
2020-01-10  9:55                   ` Miquel Raynal

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