'''Improvements'''

* do_lock(): open file in read/write mode ({{B|2730}})

* ploop_send: use ioctl_device for PLOOP_IOC_SYNC

* ploop-check.c: rename uppercased functions

* ploop snapshot-list usage: fit to 80 cols

* fsck: use fsck.ext4 not e2fsck ({{B|2812}})

* check_size(): limit max ploop size to 16T