From: Kent Overstreet <kent.overstreet@gmail.com>
Date: Fri, 24 May 2019 18:45:33 +0000 (-0400)
Subject: bcachefs: Fix starting copygc when already started
X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=5884fddfe732183aa2be4d11444543dfae6e044b;p=linux.git

bcachefs: Fix starting copygc when already started

We can sometimes call bch2_dev_read_write() when the device is already
RW (in error paths).

Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>
---

diff --git a/fs/bcachefs/movinggc.c b/fs/bcachefs/movinggc.c
index d97be76da58fc..44e235ef3de01 100644
--- a/fs/bcachefs/movinggc.c
+++ b/fs/bcachefs/movinggc.c
@@ -283,7 +283,8 @@ int bch2_copygc_start(struct bch_fs *c, struct bch_dev *ca)
 {
 	struct task_struct *t;
 
-	BUG_ON(ca->copygc_thread);
+	if (ca->copygc_thread)
+		return 0;
 
 	if (c->opts.nochanges)
 		return 0;