On Fri, Jul 20, 2012 at 12:18:59PM -0600, Zach Brown wrote:
> > +static int is_ssd(const char *file)
> > +{
> > + char *dev = strrchr(file, '/');
>
> [ ... ]
>
> > + snprintf(path, PATH_MAX, "/sys/block/%s/queue/rotational", dev);
> > + fd = open(path, O_RDONLY);
>
> Hmm, this doesn't seem right. The last path component can have nothing
> to do with the underlying device name. And /sys/block doesn't have
> entries for partition devices.
>
> After some poking around (and hints from Eric), it looks like the thing
> to do is stat the file to find that it's a block device and then use
> blkid_devno_to_wholedisk(). That parses the link from
> /sys/dev/block/$maj:$min to find the containing device.
>
> Then it'll work for partitions and nutty udev vanity symlinks.
>
Partitions are for losers.
Josef
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