selftests: ublk: add _ublk_del_dev helper function

Add _ublk_del_dev() to delete a specific ublk device by ID and
use it in all test scripts instead of calling UBLK_PROG directly.

Also remove unuse

selftests: ublk: add _ublk_del_dev helper function

Add _ublk_del_dev() to delete a specific ublk device by ID and
use it in all test scripts instead of calling UBLK_PROG directly.

Also remove unused _remove_ublk_devices() function.

Signed-off-by: Ming Lei <ming.lei@redhat.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>

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selftests: ublk: derive TID automatically from script name

Add automatic TID derivation in test_common.sh based on the script
filename. The TID is extracted by stripping the "test_" prefix and
".sh"

selftests: ublk: derive TID automatically from script name

Add automatic TID derivation in test_common.sh based on the script
filename. The TID is extracted by stripping the "test_" prefix and
".sh" suffix from the script name (e.g., test_loop_01.sh -> loop_01).

This removes the need for each test script to manually define TID,
reducing boilerplate and preventing potential mismatches between
the script name and TID. Scripts can still override TID after
sourcing test_common.sh if needed.

Reviewed-by: Caleb Sander Mateos <csander@purestorage.com>
Signed-off-by: Ming Lei <ming.lei@redhat.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>

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selftests: ublk: add stop command with --safe option

Add 'stop' subcommand to kublk utility that uses the new
UBLK_CMD_TRY_STOP_DEV command when --safe option is specified.
This allows stopping a de

selftests: ublk: add stop command with --safe option

Add 'stop' subcommand to kublk utility that uses the new
UBLK_CMD_TRY_STOP_DEV command when --safe option is specified.
This allows stopping a device only if it has no active openers,
returning -EBUSY otherwise.

Also add test_generic_16.sh to test the new functionality.

Signed-off-by: Ming Lei <ming.lei@redhat.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>

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