From: Liu Bo <bo.li.liu@oracle.com>
Date: Fri, 18 Aug 2017 15:15:22 -0600
Subject: Btrfs: remove BUG() in add_data_reference
Git-commit: b14c55a191263889c379aeee85223bb72501824d
Patch-mainline: v4.14-rc1
References: bsc#1149325

Now that we have a helper to report invalid value of extent inline ref
type, we need to quit gracefully instead of throwing out a kernel panic.

Signed-off-by: Liu Bo <bo.li.liu@oracle.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
Acked-by: Johannes Thumshirn <jthumshirn@suse.de>
---
 fs/btrfs/relocation.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/fs/btrfs/relocation.c b/fs/btrfs/relocation.c
index 96f816aa9ed3..1c086d0667be 100644
--- a/fs/btrfs/relocation.c
+++ b/fs/btrfs/relocation.c
@@ -3772,7 +3772,10 @@ int add_data_references(struct reloc_control *rc,
 			ret = find_data_references(rc, extent_key,
 						   eb, dref, blocks);
 		} else {
-			BUG();
+			ret = -EINVAL;
+			btrfs_err(rc->extent_root->fs_info,
+		     "extent %llu slot %d has an invalid inline ref type",
+			     eb->start, path->slots[0]);
 		}
 		if (ret) {
 			err = ret;