From: Omar Sandoval <osandov@fb.com>
Date: Fri, 11 May 2018 13:13:31 -0700
Subject: Btrfs: don't BUG_ON() in btrfs_truncate_inode_items()
Git-commit: 0552210997badb6a60740a26ff9d976a416510f0
Patch-mainline: v4.18-rc1
References: bsc#1111469

btrfs_free_extent() can fail because of ENOMEM. There's no reason to
panic here, we can just abort the transaction.

Fixes: f4b9aa8d3b87 ("btrfs_truncate")
Reviewed-by: Nikolay Borisov <nborisov@suse.com>
Signed-off-by: Omar Sandoval <osandov@fb.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
Acked-by: Nikolay Borisov <nborisov@suse.com>
---
 fs/btrfs/inode.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c
index e0863deea1a5..c966fd6e2cef 100644
--- a/fs/btrfs/inode.c
+++ b/fs/btrfs/inode.c
@@ -4918,7 +4918,10 @@ int btrfs_truncate_inode_items(struct btrfs_trans_handle *trans,
 						extent_num_bytes, 0,
 						btrfs_header_owner(leaf),
 						ino, extent_offset);
-			BUG_ON(ret);
+			if (ret) {
+				btrfs_abort_transaction(trans, ret);
+				break;
+			}
 			if (btrfs_should_throttle_delayed_refs(trans, fs_info))
 				btrfs_async_run_delayed_refs(fs_info,
 					trans->delayed_ref_updates * 2,