gfs2: Add GLF_PENDING_REPLY flag

[ Upstream commit 8bbfde08 ]

Introduce a new GLF_PENDING_REPLY flag to indicate that a reply from DLM
is expected.  Include that flag in glock dumps to show more clearly
what's going on.  (When the GLF_PENDING_REPLY flag is set, the GLF_LOCK
flag will also be set but the GLF_LOCK flag alone isn't sufficient to
tell that we are waiting for a DLM reply.)

Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com>
Stable-dep-of: 2c63986d ("gfs2: deallocate inodes in gfs2_create_inode")
Signed-off-by: Sasha Levin <sashal@kernel.org>