From: Miquel Raynal <miquel.raynal@bootlin.com>
To: Richard Weinberger <richard@nod.at>
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 19:45:56 +0100 [thread overview]
Message-ID: <20200109194556.34cf67dc@xps13> (raw)
In-Reply-To: <1737779363.17836.1578595384783.JavaMail.zimbra@nod.at>
Hi Richard,
Richard Weinberger <richard@nod.at> wrote on Thu, 9 Jan 2020 19:43:04
+0100 (CET):
> 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.
This is much clearer, thanks!
> Is now a relationship between mtd1 and mtd0?
No there is none.
> I'd expect mtd1's parent being mtd0.
This would be a new feature, right? I don't think it is the case today.
Thanks,
Miquèl
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next prev parent reply other threads:[~2020-01-09 18:46 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
2020-01-09 18:45 ` Miquel Raynal [this message]
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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