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Date: Tue, 01 Apr 2008 11:45:56 +0300 From: Artem Bityutskiy <dedekind@...dex.ru> To: Tomasz Chmielewski <mangoo@...g.org> CC: LKML <linux-kernel@...r.kernel.org>, penberg@...helsinki.fi, Jörn Engel <joern@...fs.org>, ext-adrian.hunter@...ia.com, jwboyer@...il.com Subject: Re: UBIFS vs Logfs (was [RFC PATCH] UBIFS - new flash file system) Tomasz Chmielewski wrote: > For me, the motivators to wait for LogFS are mainly the facts that it > can work on traditional block devices, and not only on pure flash: Sorry Thomasz, for me this makes zero sense. There are _much_ better file systems for block devices. UBIFS may work on top of a block device as well (just needs few hacks to make it possible) - it is not a problem at all, it is just _senseless_. JFFS2/UBIFS/LogFS is a separate _class_ of file-systems. The are designed for _flash_, which has completely different work model then block device. They are _native_ flash file systems. Here are more details: http://www.linux-mtd.infradead.org/faq/general.html#L_mtd_vs_hdd The traditional FSes _cannot_ work on top of flash. The solution for this is using FTL, which emulates a block device on top of flash. It _hides_ the real device, and fakes a block device for you. And you can use traditional FSes on top of that fake block device. The whole _point_ of this separate class of FSes is because we believe we may do much _better_ job if we use flash _natively_, instead of using FTL. FTL is the place where you loose performance, reliability, and so on. And you are saying about using a native flash FS on top of a block device like an SD card. This is just not sane: SD card first emulates a block device for you, looses performance at this point, then you again emulate a flash on top of this, and suffer from this again. -- Best Regards, Artem Bityutskiy (Артём Битюцкий) -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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