Ceph » bluestore

The alloc unit has already forbidden changed for bluestore, what's more, it should forbidden increased in bluefs. Otherwise, it can leads to coredump or bad data. Let's explain it use Bitmap Allocater, it has two presentations: * in BitmapAllocator::init_rm_free(offset, length), (offset + length) should bigger than offs. But when get_min_alloc_size() changed bigger, this can not be guaranteed. * if init_rm_free() are successfully in luck, then in rocksdb compact, when release() be called, it release a small extent but may leads to larger extents be released to Bitmap. As a result, rocksdb data is corrupted, and the osd can not be booted again.