On Tue, 2009-04-28 at 19:34 +0200, Thomas Glanzmann wrote: > Hello, > > > I wouldn't rely on crc32: it is not a strong hash, > > Such deduplication can lead to various problems, > > including security ones. > > sure thing, did you think of replacing crc32 with sha1 or md5, is this > even possible (is there enough space reserved so that the change can be > done without changing the filesystem layout) at the moment with btrfs? It is possible, there's room in the metadata for about about 4k of checksum for each 4k of data. The initial btrfs code used sha256, but the real limiting factor is the CPU time used. -chris -- To unsubscribe from this list: send the line "unsubscribe linux-btrfs" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
