From: Josef Bacik <josef@toxicpanda.com>
Date: Fri, 9 Oct 2020 09:28:24 -0400
Subject: btrfs: check reclaim_size in need_preemptive_reclaim
Git-commit: f205edf77315a33eee82a7615fb57e9297957fe9
Patch-mainline: v5.12-rc1
References: bsc#1202528

If we're flushing space for tickets then we have
space_info->reclaim_size set and we do not need to do background
reclaim.

Reviewed-by: Nikolay Borisov <nborisov@suse.com>
Signed-off-by: Josef Bacik <josef@toxicpanda.com>
Signed-off-by: David Sterba <dsterba@suse.com>
Acked-by: Nikolay Borisov <nborisov@suse.com>
---
 fs/btrfs/space-info.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/fs/btrfs/space-info.c b/fs/btrfs/space-info.c
index effb9b73a418..9f30d6837eb5 100644
--- a/fs/btrfs/space-info.c
+++ b/fs/btrfs/space-info.c
@@ -818,6 +818,13 @@ static bool need_preemptive_reclaim(struct btrfs_fs_info *fs_info,
 	if ((space_info->bytes_used + space_info->bytes_reserved) >= thresh)
 		return false;
 
+	/*
+	 * We have tickets queued, bail so we don't compete with the async
+	 * flushers.
+	 */
+	if (space_info->reclaim_size)
+		return false;
+
 	if (!btrfs_calc_reclaim_metadata_size(fs_info, space_info))
 		return false;