libblkid: fix swap-area version

 * v1: hdr->version = 1, magic string = SWAPSPACE2
 * v0: no versio in header, magic string = SWAP-SPACE

The mistake has been introduced in the old udev volume_id
binary where the version was set according to magic string.

Reported-by: Phillip Susi <psusi@ubuntu.com>
Signed-off-by: Karel Zak <kzak@redhat.com>
libmount: allow to use -s (sloppy) for all external helpers

Signed-off-by: Karel Zak <kzak@redhat.com>
libmount: update utab after successful extern helper mount

This patch allows to maintain private utab libmount file also for
external mount/umount helpers that are not linked with libmount.

The libmount check if utab has been updated after successful extern
helper execution (status=0). If not then the file is updated.

This patch affects only 'user' fstab mount option. So, for example
with suid mount.cifs you can use:

 //server/foo    /mnt  cifs   username=foo,noauto,user

Signed-off-by: Karel Zak <kzak@redhat.com>
blkdiscard: BLKSSZGET fills in an int, not a uint64

Reported-by: Jason Cipriani <jason.cipriani@gmail.com>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
blockdev: don't use HDIO_GETGEO

blockdev was still using this depreciated ioctl and that was
causing blockdev --report to fail on loop and nbd devices.
Switch to reading the partition start from sysfs instead.
This also allows it to correctly report > 2^32 sector counts.

[kzak@redhat.com: - check sysfs_init() return,
                  - use uint64_t rather than unsigned long long]

Signed-off-by: Phillip Susi <psusi@ubuntu.com>
Signed-off-by: Karel Zak <kzak@redhat.com>
lscpu: support non sequentially numbering of CPUs

lscpu don't work correctly on my system with:

 $ cat /sys/devices/system/cpu/possible
 0-1,4-5,8-9,12-13

[kzak@redhat.com: - coding style,
                  - add commit message
                  - add real_cpu_num() macro,
                  - fix functions where we need idx as well as CPU number]

Signed-off-by: Karel Zak <kzak@redhat.com>
tests: add sparc64 lscpu test

Signed-off-by: Karel Zak <kzak@redhat.com>