On Tue, May 12, 2009 at 04:28:06PM +0200, Karel Zak wrote: > Do you mean http://oss.oracle.com/~mkp/patches/io-topology/? Does it > work with device-mapper? Nobody wants to call exec( dmsetup ) from > shared library ;-) A more recent version of it, yes. See http://marc.info/?l=linux-scsi&r=1&b=200904&w=2 for the start of the patch series. Still doesn't do dm, but even one it does we still do need a fallback for older kernels. I don't really see a way around calling dmsetup for now. Maybe we could directly issue the dm ioctls, but I'm not sure it's a that good idea either. > > Maybe addding partitions table reading and probing to libblkid > > makes most sense? > > Good point. I can imagine such solution, the question is how/where > we plan to use the library. The fdisk-like applications usually does > not care about FS type detection etc. > Well, the idea was to create two siblings -- "ptread" and "ptwrite", > where "ptwrite" is able to use/modify/write-to-disk PT description > that was generated by ptread. Cfdisk shows the filesystem type, which I think is a really neat feature, it does howerver currently not detection e.g. LVM volumes. So switching all this to a common backend would be really nice. (Did I mention I really love the cfdisk interface? :)) Also there are uses cases where we just want to know that something is on a partition, e.g. mkfs.xfs requires you to specify -f if a block device contains either a partition table, volume manager or a pre-existing filesystem. Last but not least partition table reading is very little code, and showing that into a shared library of it's own is a bit revolting. Either we have a libfdisk or whatever doing both reading and writing, or we have the partition table detection (and reading is not much more than detecting and reading out a few fields) into the library we use for all the other detection. -- To unsubscribe from this list: send the line "unsubscribe util-linux-ng" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
