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Commit 3c462c88 authored by Goldwyn Rodrigues's avatar Goldwyn Rodrigues
Browse files

md: Increment version for clustered bitmaps 



Add BITMAP_MAJOR_CLUSTERED as 5, in order to prevent older kernels
to assemble a clustered device.

In order to maximize compatibility, the major version is set to
BITMAP_MAJOR_CLUSTERED *only* if the bitmap is clustered.

Added MD_FEATURE_CLUSTERED in order to return error for older
kernels which would assemble MD even if the bitmap is corrupted.

Signed-off-by: default avatarGoldwyn Rodrigues <rgoldwyn@suse.com>
Signed-off-by: default avatarNeilBrown <neilb@suse.com>
parent 9ed38ff5

drivers/md/bitmap.c

+4 −6
Original line number Diff line number Diff line
@@ -613,12 +613,10 @@ static int bitmap_read_sb(struct bitmap *bitmap) 
	daemon_sleep = le32_to_cpu(sb->daemon_sleep) * HZ;

	write_behind = le32_to_cpu(sb->write_behind);

	sectors_reserved = le32_to_cpu(sb->sectors_reserved);

	/* XXX: This is a hack to ensure that we don't use clustering

	 *  in case:

	 *	- dm-raid is in use and

	 *	- the nodes written in bitmap_sb is erroneous.

	/* Setup nodes/clustername only if bitmap version is

	 * cluster-compatible

	 */

	if (!bitmap->mddev->sync_super) {

	if (sb->version == cpu_to_le32(BITMAP_MAJOR_CLUSTERED)) {

		nodes = le32_to_cpu(sb->nodes);

		strlcpy(bitmap->mddev->bitmap_info.cluster_name,

				sb->cluster_name, 64);
@@ -628,7 +626,7 @@ static int bitmap_read_sb(struct bitmap *bitmap) 
	if (sb->magic != cpu_to_le32(BITMAP_MAGIC))

		reason = "bad magic";

	else if (le32_to_cpu(sb->version) < BITMAP_MAJOR_LO ||

		 le32_to_cpu(sb->version) > BITMAP_MAJOR_HI)

		 le32_to_cpu(sb->version) > BITMAP_MAJOR_CLUSTERED)

		reason = "unrecognized superblock version";

	else if (chunksize < 512)

		reason = "bitmap chunksize too small";

drivers/md/bitmap.h

+2 −0
Original line number Diff line number Diff line
@@ -9,8 +9,10 @@ 
#define BITMAP_MAJOR_LO 3

/* version 4 insists the bitmap is in little-endian order

 * with version 3, it is host-endian which is non-portable

 * Version 5 is currently set only for clustered devices

 */

#define BITMAP_MAJOR_HI 4

#define BITMAP_MAJOR_CLUSTERED 5

#define	BITMAP_MAJOR_HOSTENDIAN 3



/*

drivers/md/md.c

+3 −0
Original line number Diff line number Diff line
@@ -1735,6 +1735,9 @@ static void super_1_sync(struct mddev *mddev, struct md_rdev *rdev) 
		}

	}



	if (mddev_is_clustered(mddev))

		sb->feature_map |= cpu_to_le32(MD_FEATURE_CLUSTERED);



	if (rdev->badblocks.count == 0)

		/* Nothing to do for bad blocks*/ ;

	else if (sb->bblog_offset == 0)

include/uapi/linux/raid/md_p.h

+2 −0
Original line number Diff line number Diff line
@@ -302,6 +302,7 @@ struct mdp_superblock_1 { 
#define	MD_FEATURE_RECOVERY_BITMAP	128 /* recovery that is happening

					     * is guided by bitmap.

					     */

#define MD_FEATURE_CLUSTERED		256 /* clustered MD */

#define	MD_FEATURE_ALL			(MD_FEATURE_BITMAP_OFFSET	\

					|MD_FEATURE_RECOVERY_OFFSET	\

					|MD_FEATURE_RESHAPE_ACTIVE	\
@@ -310,6 +311,7 @@ struct mdp_superblock_1 { 
					|MD_FEATURE_RESHAPE_BACKWARDS	\

					|MD_FEATURE_NEW_OFFSET		\

					|MD_FEATURE_RECOVERY_BITMAP	\

					|MD_FEATURE_CLUSTERED		\

					)



#endif