md:Add support for Raid0->Raid5 takeover (54071b38) · Commits · e / devices / android_kernel_xiaomi_markw

drivers/md/md.c

+14 −0

Original line number	Diff line number	Diff line
		@@ -3017,6 +3017,20 @@ level_store(mddev_t mddev, const char buf, size_t len)
		mddev->to_remove = &md_redundancy_group;
		}

		if (mddev->pers->sync_request == NULL &&
		mddev->external) {
		/* We are converting from a no-redundancy array
		* to a redundancy array and metadata is managed
		* externally so we need to be sure that writes
		* won't block due to a need to transition
		* clean->dirty
		* until external management is started.
		*/
		mddev->in_sync = 0;
		mddev->safemode_delay = 0;
		mddev->safemode = 0;
		}

		module_put(mddev->pers->owner);
		/* Invalidate devices that are now superfluous */
		list_for_each_entry(rdev, &mddev->disks, same_set)

+26 −0

Original line number	Diff line number	Diff line
		@@ -52,6 +52,7 @@
		#include <linux/cpu.h>
		#include "md.h"
		#include "raid5.h"
		#include "raid0.h"
		#include "bitmap.h"

		/*
		@@ -5619,6 +5620,21 @@ static void raid5_quiesce(mddev_t *mddev, int state)
		}


		static void raid5_takeover_raid0(mddev_t mddev)
		{

		mddev->new_level = 5;
		mddev->new_layout = ALGORITHM_PARITY_N;
		mddev->new_chunk_sectors = mddev->chunk_sectors;
		mddev->raid_disks += 1;
		mddev->delta_disks = 1;
		/* make sure it will be not marked as dirty */
		mddev->recovery_cp = MaxSector;

		return setup_conf(mddev);
		}


		static void raid5_takeover_raid1(mddev_t mddev)
		{
		int chunksect;
		@@ -5748,6 +5764,16 @@ static void raid5_takeover(mddev_t mddev)
		* raid4 - trivial - just use a raid4 layout.
		* raid6 - Providing it is a *_6 layout
		*/
		if (mddev->level == 0) {
		/* for raid0 takeover only one zone is supported */
		struct raid0_private_data *raid0_priv
		= mddev->private;
		if (raid0_priv->nr_strip_zones > 1) {
		printk(KERN_ERR "md: cannot takeover raid 0 with more than one zone.\n");
		return ERR_PTR(-EINVAL);
		}
		return raid5_takeover_raid0(mddev);
		}

		if (mddev->level == 1)
		return raid5_takeover_raid1(mddev);