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Reintroduce split teardown (teardown() calls teardown_devs()) because
t-topology-support.sh only needs the teardown_devs() subset of the full
teardown() between each iteration of the topology tests -- in particular
the $TESTDIR must not get removed between each topology test iteration.
prepare_loop() must return if prepare_scsi_debug_dev() already
established $LOOP.
Also fix (and simplify) the unsafe scsi-debug device discovery in
prepare_scsi_debug_dev().
LVM2 test (rather than using the traditional loop device).
prepare_scsi_debug_dev currently assumes exclussive access to the
scsi_debug module. Any script that tries to use prepare_scsi_debug_dev
when scsi_debug is unavailable or already loaded into the kernel will be
skipped.
t-topology-support.sh shows how prepare_scsi_debug_dev function can be
used repeatedly (within a script) to test LVM2 ontop of a ramdisk-based
SCSI device w/ arbitrary scsi_debug features.
(So the tests can run under cluster locking and do not require
cluster mirror or snapshots.)
Add vgscan before block device readahead change
(flush long running process - clvmd - dev cache.)
We can temporarily violate max_lv during mirror conversion etc.
(If the operation fails, orphan mirror images are visible to administrator
for manual remove for example. Not that this should ever happen:-)
Force limit only for lvcreate (and vg merge) command.
Patch also adds simple max_lv tests into testsuite
for losetup, break out of the loop when successful setup of loop device,
and only look at 7 loop devices (default loop module setting)
for blockdev, use old option if new one is not available
