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: Chandan Rajendra <chandan@linux.vnet.ibm.com> Signed-off-by: Chris Mason <clm@fb.com>
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@ -1368,7 +1368,7 @@ int btrfs_defrag_file(struct inode *inode, struct file *file,
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ra_index = max(i, ra_index);
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ra_index = max(i, ra_index);
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btrfs_force_ra(inode->i_mapping, ra, file, ra_index,
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btrfs_force_ra(inode->i_mapping, ra, file, ra_index,
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cluster);
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cluster);
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ra_index += max_cluster;
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ra_index += cluster;
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}
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}
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mutex_lock(&inode->i_mutex);
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mutex_lock(&inode->i_mutex);
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