From 6178d104075a9f83c03fe4e5cad1e7fb271b41a7 Mon Sep 17 00:00:00 2001
From: Christoph Hellwig <hch@lst.de>
Date: Thu, 12 Mar 2020 16:52:51 -0700
Subject: [PATCH] xfs: remove dead code from xfs_log_unmount_write
Git-commit: 6178d104075a9f83c03fe4e5cad1e7fb271b41a7
Patch-mainline: v5.7-rc1
References: git-fixes

When the log is shut down all iclogs are in the XLOG_STATE_IOERROR state,
which means that xlog_state_want_sync and xlog_state_release_iclog are
no-ops.  Remove the whole section of code.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Brian Foster <bfoster@redhat.com>
Reviewed-by: Darrick J. Wong <darrick.wong@oracle.com>
Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
Acked-by: Anthony Iliopoulos <ailiop@suse.com>

---
 fs/xfs/xfs_log.c | 35 +++--------------------------------
 1 file changed, 3 insertions(+), 32 deletions(-)

diff --git a/fs/xfs/xfs_log.c b/fs/xfs/xfs_log.c
index fa499ddedb948..b56432d4a9b8f 100644
--- a/fs/xfs/xfs_log.c
+++ b/fs/xfs/xfs_log.c
@@ -984,38 +984,9 @@ xfs_log_unmount_write(xfs_mount_t *mp)
 		iclog = iclog->ic_next;
 	} while (iclog != first_iclog);
 #endif
-	if (! (XLOG_FORCED_SHUTDOWN(log))) {
-		xfs_log_write_unmount_record(mp);
-	} else {
-		/*
-		 * We're already in forced_shutdown mode, couldn't
-		 * even attempt to write out the unmount transaction.
-		 *
-		 * Go through the motions of sync'ing and releasing
-		 * the iclog, even though no I/O will actually happen,
-		 * we need to wait for other log I/Os that may already
-		 * be in progress.  Do this as a separate section of
-		 * code so we'll know if we ever get stuck here that
-		 * we're in this odd situation of trying to unmount
-		 * a file system that went into forced_shutdown as
-		 * the result of an unmount..
-		 */
-		spin_lock(&log->l_icloglock);
-		iclog = log->l_iclog;
-		atomic_inc(&iclog->ic_refcnt);
-		xlog_state_want_sync(log, iclog);
-		xlog_state_release_iclog(log, iclog);
-		switch (iclog->ic_state) {
-		case XLOG_STATE_ACTIVE:
-		case XLOG_STATE_DIRTY:
-		case XLOG_STATE_IOERROR:
-			spin_unlock(&log->l_icloglock);
-			break;
-		default:
-			xlog_wait(&iclog->ic_force_wait, &log->l_icloglock);
-			break;
-		}
-	}
+	if (XLOG_FORCED_SHUTDOWN(log))
+		return;
+	xfs_log_write_unmount_record(mp);
 }
 
 /*
-- 
2.26.1