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Date: Thu, 2 Nov 2006 23:54:17 +0100 (CET) From: Grzegorz Kulewski <kangur@...com.net> To: Mikulas Patocka <mikulas@...ax.karlin.mff.cuni.cz> Cc: linux-kernel@...r.kernel.org Subject: Re: New filesystem for Linux Hi, On Thu, 2 Nov 2006, Mikulas Patocka wrote: > As my PhD thesis, I am designing and writing a filesystem, and it's now in a > state that it can be released. You can download it from > http://artax.karlin.mff.cuni.cz/~mikulas/spadfs/ "Disk that can atomically write one sector (512 bytes) so that the sector contains either old or new content in case of crash." Well, maybe I am completly wrong but as far as I understand no disk currently will provide such requirement. Disks can have (after halted write): - old data, - new data, - nothing (unreadable sector - result of not full write and disk internal checksum failute for that sector, happens especially often if you have frequent power outages). And possibly some broken drives may also return you something that they think is good data but really is not (shouldn't happen since both disks and cables should be protected by checksums, but hey... you can never be absolutely sure especially on very big storages). So... isn't this making your filesystem a little flawed in design? Thanks, Grzegorz Kulewski - 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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