On Wed, 21 March 2007 12:25:34 +0100, Thomas Gleixner wrote: > On Wed, 2007-03-21 at 12:05 +0100, Jörn Engel wrote: > > > > Also LogFS currently requires erasesizes of 2^n. > > Last time I talked to you about that, you said it would be possible and > fixable.
Actually, no. LogFS is not broken, there is nothing to fix. And there is no fundamental reason why UBI should export blocks with non-power-of-two sizes. UBI currently consists of two parts that are intimately intertwined in the current implementation, but have relatively little connection otherwise. 1. Logical volume management. 2. Static volumes. Logical volume management can just as easily move its management information into a table, instead of having it spread across all blocks. Blocks can keep their original size. Since you have to scan flash anyway, you can also scan for a table, compare a magical number and do some extra check to protect yourself against a UBI image inside some logical volume. No big deal. Static volumes can keep a header inside their volumes. The tiny first-stage bootloader is currently scanning flash and can continue to do so. But at least this header no longer causes trouble for LogFS or any other UBI user. UBI is just as broken as LogFS is. It works with every user in mainline (which comes down to JFFS2). LogFS works with every MTD device in mainline. The only combination that doesn't work is LogFS on UBI - due to deliberate design decisions on both sides. Jörn -- Joern's library part 8: http://citeseer.ist.psu.edu/plank97tutorial.html - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
