Affects Version/s: None
Fix Version/s: None
ll_migrate() takes inode_lock and sends OST_GETATTR
via ll_data_version(). The server sends BL AST to
a truncate on the same client to release osc lock
but it waits for the inode lock.
It's a wrong locking order beacause all osc operations
take ldlm locks before inode_lock.
inode_lock was added to protect from simultaneous migrates
from 1 client. But lli_lsm_sem is taken for parent,
so inode_lock isn't needed.