linux-kernel - [PATCH 4.9 003/171] btrfs: handle ENOENT in btrfs_uuid_tree

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Message-Id: <20200102220547.376342956@linuxfoundation.org>
Date:   Thu,  2 Jan 2020 23:05:34 +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>,
        Johannes Thumshirn <jthumshirn@...e.de>,
        Josef Bacik <josef@...icpanda.com>,
        David Sterba <dsterba@...e.com>
Subject: [PATCH 4.9 003/171] btrfs: handle ENOENT in btrfs_uuid_tree_iterate

From: Josef Bacik <josef@...icpanda.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.

CC: stable@...r.kernel.org # 4.4+
Reviewed-by: Filipe Manana <fdmanana@...e.com>
Reviewed-by: Johannes Thumshirn <jthumshirn@...e.de>
Signed-off-by: Josef Bacik <josef@...icpanda.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/uuid-tree.c |    2 ++
 1 file changed, 2 insertions(+)

--- a/fs/btrfs/uuid-tree.c
+++ b/fs/btrfs/uuid-tree.c
@@ -335,6 +335,8 @@ 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);