[PATCH] better block device detection for linux 2.6

[Andres Salomon]

Hi,

The root problem of my prior patch was due to the sketchy probing of
partitions in linux, using /proc/partitions and attempting to understand
the names.  Linux 2.6 now includes /sys/block, which contains all block
devices on the system (and their partitions underneath that).  The
attached patch makes parted attempt to probe devices via /sys/block, and
fall back to /proc/partitions if /sys isn't mounted.

This is against some cvs version of parted, but applies to 1.6.25.1.
There are probably additional entries that should be ignored (currently
I've got just dm-*, loop*, and ram*).  Those can be added as necessary.

Partitions can also be probed via /sys/block as well, if it's desirable
to do that instead of reading the partition table from the block device;
I didn't bother to write any code to do it, since I didn't see the
necessity.

patch2.patch
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