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From:   Ben Hutchings <ben@decadent.org.uk>
To:     linux-kernel@vger.kernel.org, stable@vger.kernel.org
CC:     akpm@linux-foundation.org, Denis Kirjanov <kda@linux-powerpc.org>,
        "David Sterba" <dsterba@suse.com>,
        "Johannes Thumshirn" <jthumshirn@suse.de>,
        "Filipe Manana" <fdmanana@suse.com>,
        "Josef Bacik" <josef@toxicpanda.com>
Date:   Fri, 24 Apr 2020 00:05:43 +0100
Message-ID: <lsq.1587683028.968684714@decadent.org.uk>
Subject: [PATCH 3.16 116/245] btrfs: handle ENOENT in btrfs_uuid_tree_iterate
In-Reply-To: <lsq.1587683027.831233700@decadent.org.uk>
Sender: linux-kernel-owner@vger.kernel.org
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3.16.83-rc1 review patch.  If anyone has any objections, please let me know.

------------------

From: Josef Bacik <josef@toxicpanda.com>

commit 714cd3e8cba6841220dce9063a7388a81de03825 upstream.

If we get an -ENOENT back from btrfs_uuid_iter_rem when iterating the
uuid tree we'll just continue and do btrfs_next_item().  However we've
done a btrfs_release_path() at this point and no longer have a valid
path.  So increment the key and go back and do a normal search.

Reviewed-by: Filipe Manana <fdmanana@suse.com>
Reviewed-by: Johannes Thumshirn <jthumshirn@suse.de>
Signed-off-by: Josef Bacik <josef@toxicpanda.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
---
 fs/btrfs/uuid-tree.c | 2 ++
 1 file changed, 2 insertions(+)

--- a/fs/btrfs/uuid-tree.c
+++ b/fs/btrfs/uuid-tree.c
@@ -333,6 +333,8 @@ again_search_slot:
 				}
 				if (ret < 0 && ret != -ENOENT)
 					goto out;
+				key.offset++;
+				goto again_search_slot;
 			}
 			item_size -= sizeof(subid_le);
 			offset += sizeof(subid_le);