From d09dc5980c3e4840352c3c7b575975cbb72e7270 Mon Sep 17 00:00:00 2001
From: DeHackEd <DeHackEd@users.noreply.github.com>
Date: Sun, 16 Feb 2020 15:44:08 -0500
Subject: [PATCH] Honour sync=disabled when relinking tpmfiles

Unlinked files don't respect synchronous flush commands, but when they get relinked
their state is unknown. Previously we force flushed all such files even when
sync=disabled. Correct this case.

Reviewed-by: Chunwei Chen <tuxoko@gmail.com>
Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Reviewed-by: George Melikov <mail@gmelikov.ru>
Signed-off-by: DHE <git@dehacked.net>
Closes #10005
---
 module/os/linux/zfs/zfs_vnops.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/module/os/linux/zfs/zfs_vnops.c b/module/os/linux/zfs/zfs_vnops.c
index 406cd7ef22..ec870957ff 100644
--- a/module/os/linux/zfs/zfs_vnops.c
+++ b/module/os/linux/zfs/zfs_vnops.c
@@ -4431,7 +4431,7 @@ top:
 	if (!is_tmpfile && zfsvfs->z_os->os_sync == ZFS_SYNC_ALWAYS)
 		zil_commit(zilog, 0);
 
-	if (is_tmpfile)
+	if (is_tmpfile && zfsvfs->z_os->os_sync != ZFS_SYNC_DISABLED)
 		txg_wait_synced(dmu_objset_pool(zfsvfs->z_os), txg);
 
 	zfs_inode_update(tdzp);