/usr/src/kernel-patches/lustre/patches/raid5-large-io-rhel5.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 15 | diff -pur linux-2.6.18-53.orig/drivers/md/raid5.c linux-2.6.18-53/drivers/md/raid5.c
--- linux-2.6.18-53.orig/drivers/md/raid5.c 2007-12-06 17:26:27.000000000 +0800
+++ linux-2.6.18-53/drivers/md/raid5.c 2007-12-06 17:26:55.000000000 +0800
@@ -3340,6 +3340,11 @@ static int run(mddev_t *mddev)
mddev->array_size = mddev->size * (conf->previous_raid_disks -
conf->max_degraded);
+ /* in order to support large I/Os */
+ blk_queue_max_sectors(mddev->queue, conf->chunk_size * conf->previous_raid_disks >> 9);
+ mddev->queue->max_phys_segments = conf->chunk_size * (conf->previous_raid_disks - conf->max_degraded) >> PAGE_SHIFT;
+ mddev->queue->max_hw_segments = conf->chunk_size * conf->previous_raid_disks >> PAGE_SHIFT;;
+
return 0;
abort:
if (conf) {
|