Re: RFC: generalize jffs2_nand_flash_setup

On Thursday 29 April 2004 16:31, Josh Boyer wrote:
> Hello,
>
> Below is a patch to fs.c to remove an unneeded if statement around
> jffs2_nand_flash_setup that I would like to get applied to the CVS
> tree.  I have two reasons for this.
>
> One is that the if (jffs2_cleanmarker_oob(c)) is unneeded since the
> jffs2_nand_flash_setup function is #defined to (0) unless
> CONFIG_JFFS2_FS_NAND is set.

But it is neccecary, if you have a board with NOR _and_ NAND flash so the fs 
driver _must_ decide whether to call this or not.

> The other reason is, I see some benefit in generalizing
> jffs2_nand_flash_setup into something that can be used for more than
> just NAND flash.  The comment in that code says "NAND (or other bizarre)
> flash... do setup accordingly".  Well, I have the "other bizarre" flash
> case because I am using NOR flash with transparent ECC.  This requires
> some of the same things that NAND does (mainly the wbuf), but it doesn't
> have OOB data like NAND, so CONFIG_JFFS2_FS_NAND can't be used directly.

Sure

> jffs2_nand_flash_setup could be renamed jffs2_flash_setup so that it is
> more general, and adding support for bizarre flashes is easier.  MTD
> already supports some of these flashes (see cfi_cmdset_0020.c), so now
> it's just a matter of getting JFFS2 support there.

having jffs2_flash_setup() and jffs2_flash_cleanup() is ok, but this functions 
should look like

void jffs2_flash_setup(struct jffs2_sb_info *c)
{
	if (isbizzarre1(c))
		setup_bizarre1(c);
	if (bizzarre2(c))
		setup_bizarre2(c);
	.....
}

The "if (jffs2_cleanmarker_oob(c))" is the (isbizzarre1(c)) for NAND

-- 
Thomas
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