/usr/src/kernel-patches/lustre/patches/raid6-large-io.patch is in linux-patch-lustre 1.8.5+dfsg-3ubuntu1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 | --- linux-2.6.9.orig/drivers/md/raid6main.c 2006-09-07 23:12:09.000000000 +0800
+++ linux-2.6.9/drivers/md/raid6main.c 2006-09-07 23:12:44.000000000 +0800
@@ -1775,6 +1775,11 @@ static int run (mddev_t *mddev)
mddev->queue->unplug_fn = raid6_unplug_device;
mddev->queue->issue_flush_fn = raid6_issue_flush;
+ /* in order to support large I/Os */
+ blk_queue_max_sectors(mddev->queue, mddev->chunk_size * mddev->raid_disks >> 9);
+ mddev->queue->max_phys_segments = mddev->chunk_size * mddev->raid_disks >> PAGE_SHIFT;
+ mddev->queue->max_hw_segments = mddev->chunk_size * mddev->raid_disks >> PAGE_SHIFT;
+
PRINTK("raid6: run(%s) called.\n", mdname(mddev));
ITERATE_RDEV(mddev,rdev,tmp) {
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