xfs: fix and streamline error handling in xfs_end_io
There are two different cases of buffered I/O errors: - first we can have an already shutdown fs. In that case we should skip any on-disk operations and just clean up the appen transaction if present and destroy the ioend - a real I/O error. In that case we should cleanup any lingering COW blocks. This gets skipped in the current code and is fixed by this patch. Signed-off-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Darrick J. Wong <darrick.wong@oracle.com> Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
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