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imsm: improve getinfo_super when reshape is in progress. 

If a reshape (migration) is happening, we might need to modify the information
with provide to md so that it can cope with the reshape.
For example, if a migration from 4-device RAID0 to 5-device RAID0 is
happening, we need to tell md that it is reshape from degraded
5-device RAID4 to degraded 6-device RAID4 so md doesn't handle direct
reshape of RAID0.

There may be other migrations supported by IMSM that need special
treatment here.

Signed-off-by: NeilBrown <neilb@suse.de>
This commit is contained in:
NeilBrown 2011-03-08 15:59:09 +11:00
parent e14e59602a
commit 3f83228aa8
1 changed files with 34 additions and 7 deletions
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41
super-intel.c
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@ -1756,14 +1756,47 @@ static void getinfo_super_imsm_volume(struct supertype *st, struct mdinfo *info,
info->custom_array_size = __le32_to_cpu(dev->size_high);
info->custom_array_size <<= 32;
info->custom_array_size |= __le32_to_cpu(dev->size_low);
if (prev_map) {
if (prev_map && map->map_state == prev_map->map_state) {
info->reshape_active = 1;
info->new_level = get_imsm_raid_level(map);
info->new_layout = imsm_level_to_layout(info->new_level);
info->new_chunk = __le16_to_cpu(map->blocks_per_strip) << 9;
info->delta_disks = map->num_members - prev_map->num_members;
/* We shape information that we give to md might have to be
* modify to cope with md's requirement for reshaping arrays.
* For example, when reshaping a RAID0, md requires it to be
* presented as a degraded RAID4.
* Also if a RAID0 is migrating to a RAID5 we need to specify
* the array as already being RAID5, but the 'before' layout
* is a RAID4-like layout.
*/
switch (info->array.level) {
case 0:
switch(info->new_level) {
case 0:
/* conversion is happening as RAID4 */
info->array.level = 4;
info->array.raid_disks += 1;
break;
case 5:
/* conversion is happening as RAID5 */
info->array.level = 5;
info->array.layout = ALGORITHM_PARITY_N;
info->array.raid_disks += 1;
info->delta_disks -= 1;
break;
default:
/* FIXME error message */
info->array.level = UnSet;
break;
}
break;
}
} else {
info->new_level = UnSet;
info->new_layout = UnSet;
info->new_chunk = info->array.chunk_size;
info->delta_disks = 0;
}
info->disk.major = 0;
info->disk.minor = 0;
@ -1777,12 +1810,6 @@ static void getinfo_super_imsm_volume(struct supertype *st, struct mdinfo *info,
__le32_to_cpu(map_to_analyse->blocks_per_member);
memset(info->uuid, 0, sizeof(info->uuid));
info->recovery_start = MaxSector;
info->reshape_active = (prev_map != NULL) &&
(map->map_state == prev_map->map_state);
if (info->reshape_active)
info->delta_disks = map->num_members - prev_map->num_members;
else
info->delta_disks = 0;
info->reshape_progress = 0;
if (map_to_analyse->map_state == IMSM_T_STATE_UNINITIALIZED ||