[PATCH v2] btrfs: 210: Ignore output from "quota rescan" after "quota enable"

[Marcos Paulo de Souza <marcos@mpdesouza.com>]

From: Marcos Paulo de Souza <mpdesouza@suse.com>

Command "quota enable" triggers a quota rescan, but it can finish quick
in some machines leading to the next command "quota rescan" to be able
to start scanning again, and then printing "quota rescan started" making
the test fail.

In some machines this don't happen because the first rescan initiated by
"quota enable" is still running when "quota rescan" is executed, returning
-EINPROGRESS from ioctl BTRFS_IOC_QUOTA_RESCAN_STATUS and not printing the
message.

Ignoring any output from "quota rescan" solves the issue in both cases, and
this is already being done by others tests as well.

Signed-off-by: Marcos Paulo de Souza <mpdesouza@suse.com>
---
 Patch v1 can be found here:
 https://www.spinics.net/lists/linux-btrfs/msg103177.html

 tests/btrfs/210 | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tests/btrfs/210 b/tests/btrfs/210
index daa76a87..13d1a87b 100755
--- a/tests/btrfs/210
+++ b/tests/btrfs/210
@@ -46,7 +46,7 @@ _pwrite_byte 0xcd 0 16M "$SCRATCH_MNT/src/file" > /dev/null
 # by qgroup
 sync
 $BTRFS_UTIL_PROG quota enable "$SCRATCH_MNT"
-$BTRFS_UTIL_PROG quota rescan -w "$SCRATCH_MNT"
+$BTRFS_UTIL_PROG quota rescan -w "$SCRATCH_MNT" > /dev/null
 $BTRFS_UTIL_PROG qgroup create 1/0 "$SCRATCH_MNT"
 
 # Create a snapshot with qgroup inherit
-- 
2.27.0