The iclogbuf ring attached to the struct xlog is circular, hence the
first and last iclogs in the ring can only be determined by
comparing them against the log->l_iclog pointer.

In xfs_cil_push_work(), we want to wait on previous iclogs that were
issued so that we can flush them to stable storage with the commit
record write, and it simply waits on the previous iclog in the ring.
This, however, leads to CIL push hangs in generic/019 like so:

task:kworker/u33:0   state:D stack:12680 pid:    7 ppid:     2 flags:0x00004000
Workqueue: xfs-cil/pmem1 xlog_cil_push_work
Call Trace:
 __schedule+0x30b/0x9f0
 schedule+0x68/0xe0
 xlog_wait_on_iclog+0x121/0x190
 ? wake_up_q+0xa0/0xa0
 xlog_cil_push_work+0x994/0xa10
 ? _raw_spin_lock+0x15/0x20
 ? xfs_swap_extents+0x920/0x920
 process_one_work+0x1ab/0x390
 worker_thread+0x56/0x3d0
 ? rescuer_thread+0x3c0/0x3c0
 kthread+0x14d/0x170
 ? __kthread_bind_mask+0x70/0x70
 ret_from_fork+0x1f/0x30

With other threads blocking in either xlog_state_get_iclog_space()
waiting for iclog space or xlog_grant_head_wait() waiting for log
reservation space.

The problem here is that the previous iclog on the ring might
actually be a future iclog. That is, if log->l_iclog points at
commit_iclog, commit_iclog is the first (oldest) iclog in the ring
and there are no previous iclogs pending as they have all completed
their IO and been activated again. IOWs, commit_iclog->ic_prev
points to an iclog that will be written in the future, not one that
has been written in the past.

Hence, in this case, waiting on the ->ic_prev iclog is incorrect
behaviour, and depending on the state of the future iclog, we can
end up with a circular ABA wait cycle and we hang.

The fix is made more complex by the fact that many iclogs states
cannot be used to determine if the iclog is a past or future iclog.
Hence we have to determine past iclogs by checking the LSN of the
iclog rather than their state. A past ACTIVE iclog will have a LSN
of zero, while a future ACTIVE iclog will have a LSN greater than
the current iclog. We don't wait on either of these cases.

Similarly, a future iclog that hasn't completed IO will have an LSN
greater than the current iclog and so we don't wait on them. A past
iclog that is still undergoing IO completion will have a LSN less
than the current iclog and those are the only iclogs that we need to
wait on.

Hence we can use the iclog LSN to determine what iclogs we need to
wait on here.

Fixes: 5fd9256ce156 ("xfs: separate CIL commit record IO")
Reported-by: Brian Foster <bfoster@redhat.com>
Signed-off-by: Dave Chinner <dchinner@redhat.com>
Reviewed-by: Brian Foster <bfoster@redhat.com>
Reviewed-by: Darrick J. Wong <djwong@kernel.org>
Signed-off-by: Darrick J. Wong <djwong@kernel.org>