On Mon, Jul 20, 2009 at 12:32:44AM +0200, Christoph Hellwig wrote:
> This patch is a first draft at adding support for the sysfs I/O
thanks
> topologies exported by kernels 2.6.30 or newer. The parsing code is
> taken straight from patches that Mike Snitzer sent to the LVM list.
>
> Right now we only add the attributes to the tags, as a demonstration
> how it this can be embedded into libblkid. Unfortunately that
> meanso
we have to integrate this to the low-level probing interface
(blkid_do_[safe]prob() functions). I'll try it this week.
> We will have to add lowlevel probing functions for these
> tools which could also return the information in binary format
> instead of having to go to and back from ASCII for the tagged format.
hmm.. currently, the API is completely based on strings, so you have
to call:
char *data;
unsigned long x;
blkid_probe_set_device(pr, device_fd, 0, 0);
blkid_do_probe(pr);
blkid_probe_lookup_value(pr, "ALIGNMENT_OFFSET", &data, NULL);
x = strtoul(data, NULL, 10);
.. but for partitions parsing code we will probably also need some
binary interface. Maybe something like:
blkid_probe_enable_binary(pr);
blkid_do_probe(pr);
x = blkid_probe_lookup_ulong(pr, "ALIGNMENT_OFFSET");
and internally store the values as unsigned long integers.
The high-level interface (tags, -- e.g. blkid_get_tag_value()) is
probably better to keep based on strings only.
Karel
--
Karel Zak <kzak@xxxxxxxxxx>
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