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imsm: Add support for general migration 

Internal IMSM procedures need to support the General Migration.
It is used during operations like:
- Online Capacity Expansion,
- migration initialization,
- finishing migration,
- apply changes to raid disks etc.

Signed-off-by: Adam Kwolek <adam.kwolek@intel.com>
Signed-off-by: NeilBrown <neilb@suse.de>
This commit is contained in:
Adam Kwolek 2010-11-29 12:28:01 +11:00 committed by NeilBrown
parent 6d11ec6fc2
commit 28bce06f17
1 changed files with 55 additions and 7 deletions
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62
super-intel.c
View File

@ -2183,7 +2183,8 @@ static void migrate(struct imsm_dev *dev, __u8 to_state, int migr_type)
/* duplicate and then set the target end state in map[0] */
memcpy(dest, src, sizeof_imsm_map(src));
if (migr_type == MIGR_REBUILD) {
if ((migr_type == MIGR_REBUILD) ||
(migr_type == MIGR_GEN_MIGR)) {
__u32 ord;
int i;
@ -2200,18 +2201,26 @@ static void end_migration(struct imsm_dev *dev, __u8 map_state)
{
struct imsm_map *map = get_imsm_map(dev, 0);
struct imsm_map *prev = get_imsm_map(dev, dev->vol.migr_state);
int i;
int i, j;
/* merge any IMSM_ORD_REBUILD bits that were not successfully
* completed in the last migration.
*
* FIXME add support for online capacity expansion and
* raid-level-migration
* FIXME add support for raid-level-migration
*/
for (i = 0; i < prev->num_members; i++)
map->disk_ord_tbl[i] |= prev->disk_ord_tbl[i];
for (j = 0; j < map->num_members; j++)
/* during online capacity expansion
* disks position can be changed if takeover is used
*/
if (ord_to_idx(map->disk_ord_tbl[j]) ==
ord_to_idx(prev->disk_ord_tbl[i])) {
map->disk_ord_tbl[j] |= prev->disk_ord_tbl[i];
break;
}
dev->vol.migr_state = 0;
dev->vol.migr_type = 0;
dev->vol.curr_migr_unit = 0;
map->map_state = map_state;
}
@ -4323,6 +4332,17 @@ static int update_subarray_imsm(struct supertype *st, char *subarray,
}
#endif /* MDASSEMBLE */
static int is_gen_migration(struct imsm_dev *dev)
{
if (!dev->vol.migr_state)
return 0;
if (migr_type(dev) == MIGR_GEN_MIGR)
return 1;
return 0;
}
static int is_rebuilding(struct imsm_dev *dev)
{
struct imsm_map *migr_map;
@ -4413,8 +4433,7 @@ static struct mdinfo *container_content_imsm(struct supertype *st, char *subarra
* unsupported migration
*/
if (dev->vol.migr_state &&
(migr_type(dev) == MIGR_GEN_MIGR ||
migr_type(dev) == MIGR_STATE_CHANGE)) {
(migr_type(dev) == MIGR_STATE_CHANGE)) {
fprintf(stderr, Name ": cannot assemble volume '%.16s':"
" unsupported migration in progress\n",
dev->volume);
@ -4697,6 +4716,8 @@ static void handle_missing(struct intel_super *super, struct imsm_dev *dev)
super->updates_pending++;
}
static void imsm_set_disk(struct active_array *a, int n, int state);
/* Handle dirty -> clean transititions and resync. Degraded and rebuild
* states are handled in imsm_set_disk() with one exception, when a
* resync is stopped due to a new failure this routine will set the
@ -4772,6 +4793,16 @@ static int imsm_set_array_state(struct active_array *a, int consistent)
dev->vol.dirty = 1;
super->updates_pending++;
}
/* finalize online capacity expansion/reshape */
if ((a->curr_action != reshape) &&
(a->prev_action == reshape)) {
struct mdinfo *mdi;
for (mdi = a->info.devs; mdi; mdi = mdi->next)
imsm_set_disk(a, mdi->disk.raid_disk, mdi->curr_state);
}
return consistent;
}
@ -4835,6 +4866,23 @@ static void imsm_set_disk(struct active_array *a, int n, int state)
end_migration(dev, map_state);
super->updates_pending++;
a->last_checkpoint = 0;
} else if (is_gen_migration(dev)) {
dprintf("imsm: Detected General Migration in state: ");
if (map_state == IMSM_T_STATE_NORMAL) {
end_migration(dev, map_state);
map = get_imsm_map(dev, 0);
map->failed_disk_num = ~0;
dprintf("normal\n");
} else {
if (map_state == IMSM_T_STATE_DEGRADED) {
printf("degraded\n");
end_migration(dev, map_state);
} else {
dprintf("failed\n");
}
map->map_state = map_state;
}
super->updates_pending++;
}
}