From a3c98d5728701d455e036d7687e3f7dbbb6100e5 Mon Sep 17 00:00:00 2001
From: TulsiJain <tulsi.jain@Tulsi-Jains-MacBook-Pro.local>
Date: Tue, 28 May 2019 14:14:23 -0700
Subject: [PATCH] Make zfs_async_block_max_blocks handle zero correctly

Reviewed-by: Matt Ahrens <mahrens@delphix.com>
Reviewed-by: Paul Dagnelie <pcd@delphix.com>
Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: TulsiJain <tulsi.jain@delphix.com>
Closes #8829
Closes #8289
---
 module/zfs/dsl_scan.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/module/zfs/dsl_scan.c b/module/zfs/dsl_scan.c
index b15c39ac9c..04a439fad5 100644
--- a/module/zfs/dsl_scan.c
+++ b/module/zfs/dsl_scan.c
@@ -3025,8 +3025,10 @@ dsl_scan_async_block_should_pause(dsl_scan_t *scn)
 	if (zfs_recover)
 		return (B_FALSE);
 
-	if (scn->scn_visited_this_txg >= zfs_async_block_max_blocks)
+	if (zfs_async_block_max_blocks != 0 &&
+	    scn->scn_visited_this_txg >= zfs_async_block_max_blocks) {
 		return (B_TRUE);
+	}
 
 	elapsed_nanosecs = gethrtime() - scn->scn_sync_start_time;
 	return (elapsed_nanosecs / NANOSEC > zfs_txg_timeout ||