6413573 deadlock between fsflush() and zfs_create()

[mark.may...@sun.com]

Author: maybee
Repository: /hg/onnv/onnv-gate
Revision: 2dd24a5efe8bb703f8a0b96d0cbaab6d4f744456
Log message:
6413573 deadlock between fsflush() and zfs_create()
6416101 du inside snapshot produces bad sizes and paths

Files:
        update: usr/src/uts/common/fs/zfs/sys/zfs_znode.h
        update: usr/src/uts/common/fs/zfs/zfs_dir.c
        update: usr/src/uts/common/fs/zfs/zfs_vnops.c
        update: usr/src/uts/common/fs/zfs/zfs_znode.c