linux-kernel - [PATCH 5.5 111/119] btrfs: fix removal of raid[56|1c34} incompat flags after removing block group

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Date:   Tue, 24 Mar 2020 14:11:36 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Filipe Manana <fdmanana@...e.com>,
        David Sterba <dsterba@...e.com>
Subject: [PATCH 5.5 111/119] btrfs: fix removal of raid[56|1c34} incompat flags after removing block group

From: Filipe Manana <fdmanana@...e.com>

commit d8e6fd5c7991033037842b32c9774370a038e902 upstream.

We are incorrectly dropping the raid56 and raid1c34 incompat flags when
there are still raid56 and raid1c34 block groups, not when we do not any
of those anymore. The logic just got unintentionally broken after adding
the support for the raid1c34 modes.

Fix this by clear the flags only if we do not have block groups with the
respective profiles.

Fixes: 9c907446dce3 ("btrfs: drop incompat bit for raid1c34 after last block group is gone")
Signed-off-by: Filipe Manana <fdmanana@...e.com>
Reviewed-by: David Sterba <dsterba@...e.com>
Signed-off-by: David Sterba <dsterba@...e.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 fs/btrfs/block-group.c |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

--- a/fs/btrfs/block-group.c
+++ b/fs/btrfs/block-group.c
@@ -849,9 +849,9 @@ static void clear_incompat_bg_bits(struc
 				found_raid1c34 = true;
 			up_read(&sinfo->groups_sem);
 		}
-		if (found_raid56)
+		if (!found_raid56)
 			btrfs_clear_fs_incompat(fs_info, RAID56);
-		if (found_raid1c34)
+		if (!found_raid1c34)
 			btrfs_clear_fs_incompat(fs_info, RAID1C34);
 	}
 }