linux-kernel - [PATCH v2 0/2] btrfs: send: fix failures when processing inodes with no links

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Message-Id: <20220811100912.126447-1-bingjingc@synology.com>
Date:   Thu, 11 Aug 2022 18:09:10 +0800
From:   bingjingc <bingjingc@...ology.com>
To:     fdmanana@...nel.org, josef@...icpanda.com, dsterba@...e.com,
        clm@...com, linux-btrfs@...r.kernel.org,
        linux-kernel@...r.kernel.org
Cc:     bingjingc@...ology.com, robbieko@...ology.com, bxxxjxxg@...il.com
Subject: [PATCH v2 0/2]  btrfs: send: fix failures when processing inodes with no links

From: BingJing Chang <bingjingc@...ology.com>

There is a bug causing send failures when processing an orphan directory
with no links. In commit 46b2f4590aab ("Btrfs: fix send failure when root
has deleted files still open")', the orphan inode issue was addressed. The
send operation fails with a ENOENT error because of any attempts to
generate a path for the inode with a link count of zero. Therefore, in that
patch, sctx->ignore_cur_inode was introduced to be set if the current inode
has a link count of zero for bypassing some unnecessary steps. And a helper
function btrfs_unlink_all_paths() was introduced and called to clean up old
paths found in the parent snapshot. However, not only regular files but
also directories can be orphan inodes. So if the send operation meets an
orphan directory, it will issue a wrong unlink command for that directory
now. Soon the receive operation fails with a EISDIR error. Besides, the
send operation also fails with a ENOENT error later when it tries to
generate a path of it.

BingJing Chang (2):
  btrfs: send: refactor get_inode_info()
  btrfs: send: fix failures when processing inodes with no links

 fs/btrfs/send.c | 364 +++++++++++++++++++++---------------------------
 1 file changed, 162 insertions(+), 202 deletions(-)

-- 
2.37.1