Do not initiate MMP writes while pool is suspended

While the pool is suspended on host A, it may be imported on host B. If host A continued to write MMP blocks, it would be blindly overwriting MMP blocks written by host B, and the blocks written by host A would have outdated txg information. Reviewed-by: Giuseppe Di Natale <[email protected]> Reviewed-by: Brian Behlendorf <[email protected]> Signed-off-by: Olaf Faaland <[email protected]> Closes #7182
openzfs · Mar 14, 2018 · b1f61f0 · b1f61f0
1 parent e5ba614
commit b1f61f0
Showing 1 changed file with 1 addition and 1 deletion.
diff --git a/module/zfs/mmp.c b/module/zfs/mmp.c
@@ -437,7 +437,7 @@ mmp_thread(spa_t *spa)
 			zio_suspend(spa, NULL);
 		}
 
-		if (multihost)
+		if (multihost && !suspended)
 			mmp_write_uberblock(spa);
 
 		CALLB_CPR_SAFE_BEGIN(&cpr);