xfs: extract xfs_da_buf_copy() helper function
This patch does not modify logic. xfs_da_buf_copy() will copy one block from src xfs_buf to dst xfs_buf, and update the block metadata in dst directly. Signed-off-by:Zhang Tianci <zhangtianci.1997@bytedance.com> Suggested-by:
Christoph Hellwig <hch@lst.de> Reviewed-by:
Christoph Hellwig <hch@lst.de> Signed-off-by:
Chandan Babu R <chandanbabu@kernel.org>
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