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Commit 4257e085 authored by Heinz Mauelshagen's avatar Heinz Mauelshagen Committed by Mike Snitzer
Browse files

dm raid: support to change bitmap region size 



Signed-off-by: default avatarHeinz Mauelshagen <heinzm@redhat.com>
Signed-off-by: default avatarMike Snitzer <snitzer@redhat.com>
parent d41bfed0

drivers/md/dm-raid.c

+11 −0
Original line number Diff line number Diff line
@@ -217,6 +217,7 @@ struct raid_set { 
	int delta_disks;

	int data_offset;

	int raid10_copies;

	int requested_bitmap_chunk_sectors;



	struct mddev md;

	struct raid_type *raid_type;
@@ -1277,6 +1278,7 @@ static int parse_raid_params(struct raid_set *rs, struct dm_arg_set *as, 
			}



			region_size = value;

			rs->requested_bitmap_chunk_sectors = value;

		} else if (!strcasecmp(key, dm_raid_arg_name_by_flag(CTR_FLAG_RAID10_COPIES))) {

			if (test_and_set_bit(__CTR_FLAG_RAID10_COPIES, &rs->ctr_flags)) {

				rs->ti->error = "Only one raid10_copies argument pair allowed";
@@ -3401,6 +3403,15 @@ static int raid_preresume(struct dm_target *ti) 
	if (r)

		return r;



	/* Resize bitmap to adjust to changed region size (aka MD bitmap chunksize) */

	if (test_bit(RT_FLAG_RS_BITMAP_LOADED, &rs->runtime_flags) &&

	    mddev->bitmap_info.chunksize != to_bytes(rs->requested_bitmap_chunk_sectors)) {

		r = bitmap_resize(mddev->bitmap, mddev->dev_sectors,

				  to_bytes(rs->requested_bitmap_chunk_sectors), 0);

		if (r)

			DMERR("Failed to resize bitmap");

	}



	/* Check for any resize/reshape on @rs and adjust/initiate */

	/* Be prepared for mddev_resume() in raid_resume() */

	set_bit(MD_RECOVERY_FROZEN, &mddev->recovery);