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md: Increment version for clustered bitmaps

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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: Goldwyn Rodrigues <rgoldwyn@suse.com>
Signed-off-by: NeilBrown <neilb@suse.com>
This commit is contained in:
Goldwyn Rodrigues 2015-08-19 07:35:54 +10:00
parent 9ed38ff530
commit 3c462c880b
4 changed files with 11 additions and 6 deletions
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10
drivers/md/bitmap.c
View file

@ -613,12 +613,10 @@ re_read:
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 @@ re_read:
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";

2
drivers/md/bitmap.h
View file

@ -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
/*

3
drivers/md/md.c
View file

@ -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)

2
include/uapi/linux/raid/md_p.h
View file

@ -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