Btrfs: btrfs_defrag_file: Fix ra_index computation.
Read-ahead is done for the pages in the range [ra_index, ra_index + cluster - 1]. So the next read-ahead should be starting from the page at index 'ra_index + cluster' (unless we deemed that the extent at 'ra_index + cluster' as non-defraggable) rather than from the page at index 'ra_index + max_cluster'. This patch fixes this. I did run the xfstests suite to make sure that the code does not regress. Signed-off-by: NChandan Rajendra <chandan@linux.vnet.ibm.com> Signed-off-by: NChris Mason <clm@fb.com>
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