Andriy Gapon f3b7b054dd add ZFS_ENTER protection to .zfs/snapshot vnode operations that need it
Those operations, zfsctl_snapdir_readdir and zfsctl_snapdir_getattr,
access the filesystem's objset and it can be unstable during operations
like receive and rollback.

MFC after:	2 weeks
2018-02-27 14:08:54 +00:00
..