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ext4: lock i_mutex when truncating orphan inodes
Commit c278531 added a warning when ext4_flush_unwritten_io() is called without i_mutex being taken. It had previously not been taken during orphan cleanup since races weren't possible at that point in the mount process, but as a result of this c278531, we will now see a kernel WARN_ON in this case. Take the i_mutex in ext4_orphan_cleanup() to suppress this warning. Reported-by: Alexander Beregalov <a.beregalov@gmail.com> Signed-off-by: "Theodore Ts'o" <tytso@mit.edu> Reviewed-by: Zheng Liu <wenqing.lz@taobao.com> Cc: stable@vger.kernel.org
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