From: Zygo Blaxell <ce3g8jdj@umail.furryterror.org>
Date: Tue, 3 Dec 2019 16:31:55 +0000 (-0500)
Subject: zygo: btrfs: check for dead roots
X-Git-Url: http://git.hungrycats.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=be7f1587feddf14a9070e7ccddc9e1d9d343f830;p=linux

zygo: btrfs: check for dead roots

(cherry picked from commit 1d9c5ddd8e5e71c9aeeca8cc516ed713ce0281b9)
---

diff --git a/fs/btrfs/relocation.c b/fs/btrfs/relocation.c
index 0395b8233c90..3ded9fc4dd5f 100644
--- a/fs/btrfs/relocation.c
+++ b/fs/btrfs/relocation.c
@@ -4655,6 +4655,11 @@ int btrfs_reloc_post_snapshot(struct btrfs_trans_handle *trans,
 	if (!root->reloc_root)
 		return 0;
 
+	if (test_bit(BTRFS_ROOT_DEAD_RELOC_TREE, &root->reloc_root->state)) {
+		WARN_ON(1);
+		return 0;
+	}
+
 	rc = root->fs_info->reloc_ctl;
 	rc->merging_rsv_size += rc->nodes_relocated;