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How to use use_fsdev_lib method in autotest

Best Python code snippet using autotest_python

fsdev_disks.py

...269FSDEV_RESTORE = None270FSDEV_PREP_CNT = 0271FSDEV_DISK1_ONLY = None272FSDEV_DISKLIST = None273def use_fsdev_lib(fs_desc, disk1_only, reinit_disks):274    """275    Called from the control file to indicate that fsdev is to be used.276    """277    global FSDEV_FS_DESC278    global FSDEV_RESTORE279    global FSDEV_DISK1_ONLY280    global FSDEV_PREP_CNT281    # This is a bit tacky - we simply save the arguments in global variables282    FSDEV_FS_DESC = fs_desc283    FSDEV_DISK1_ONLY = disk1_only284    FSDEV_RESTORE = reinit_disks285    # We need to keep track how many times 'prepare' is called286    FSDEV_PREP_CNT = 0287def prepare_fsdev(job):288    """289    Called from the test file to get the necessary drive(s) ready; return290    a pair of values: the absolute path to the first drive's mount point291    plus the complete disk list (which is useful for tests that need to292    use more than one drive).293    """294    global FSDEV_JOB295    global FSDEV_DISKLIST296    global FSDEV_PREP_CNT297    if not FSDEV_FS_DESC:298        return (None, None)299    # Avoid preparing the same thing more than once300    FSDEV_PREP_CNT += 1301    if FSDEV_PREP_CNT > 1:302        return (FSDEV_DISKLIST[0]['mountpt'], FSDEV_DISKLIST)303    FSDEV_JOB = job304    (path, toss, disks) = prepare_disks(job, fs_desc=FSDEV_FS_DESC,305                                        disk1_only=FSDEV_DISK1_ONLY,306                                        disk_list=None)307    FSDEV_DISKLIST = disks308    return (path, disks)309def finish_fsdev(force_cleanup=False):310    """311    This method can be called from the test file to optionally restore312    all the drives used by the test to a standard ext2 format. Note that313    if use_fsdev_lib() was invoked with 'reinit_disks' not set to True,314    this method does nothing. Note also that only fsdev "server-side"315    dynamic control files should ever set force_cleanup to True.316    """317    if FSDEV_PREP_CNT == 1 or force_cleanup:318        restore_disks(job=FSDEV_JOB,319                      restore=FSDEV_RESTORE,320                      disk_list=FSDEV_DISKLIST)321#322class fsdev_disks:323    """324    Disk drive handling class used for file system development325    """326    def __init__(self, job):327        self.job = job...

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