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Add raid1->raid0 takeover support 

Add support for raid1 to raid0 takeover operation in user space.
This patch includes support for native and imsm metadata.

Signed-off-by: Krzysztof Wojcik <krzysztof.wojcik@intel.com>
Signed-off-by: NeilBrown <neilb@suse.de>
This commit is contained in:
Krzysztof Wojcik 2011-01-27 08:42:41 +11:00 committed by NeilBrown
parent 26d6e1574a
commit dfe77a9ed2
2 changed files with 34 additions and 11 deletions
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39
Grow.c
View File

@ -653,15 +653,20 @@ void abort_reshape(struct mdinfo *sra)
sysfs_set_str(sra, NULL, "sync_max", "max");
}
int remove_disks_on_raid10_to_raid0_takeover(struct supertype *st,
struct mdinfo *sra,
int layout)
int remove_disks_for_takeover(struct supertype *st,
struct mdinfo *sra,
int layout)
{
int nr_of_copies;
struct mdinfo *remaining;
int slot;
nr_of_copies = layout & 0xff;
if (sra->array.level == 10)
nr_of_copies = layout & 0xff;
else if (sra->array.level == 1)
nr_of_copies = sra->array.raid_disks;
else
return 1;
remaining = sra->devs;
sra->devs = NULL;
@ -913,8 +918,18 @@ char *analyse_change(struct mdinfo *info, struct reshape *re)
switch (info->array.level) {
case 1:
/* RAID1 can convert to RAID1 with different disks, or
* raid5 with 2 disks
* raid5 with 2 disks, or
* raid0 with 1 disk
*/
if (info->new_level == 0) {
re->level = 0;
re->before.data_disks = 1;
re->after.data_disks = 1;
re->before.layout = 0;
re->backup_blocks = 0;
re->parity = 0;
return NULL;
}
if (info->new_level == 1) {
if (info->delta_disks == UnSet)
/* Don't know what to do */
@ -1450,15 +1465,17 @@ int Grow_reshape(char *devname, int fd, int quiet, char *backup_file,
size = array.size;
}
/* ========= check for Raid10 -> Raid0 conversion ===============
/* ========= check for Raid10/Raid1 -> Raid0 conversion ===============
* current implementation assumes that following conditions must be met:
* - far_copies == 1
* - near_copies == 2
* - RAID10:
* - far_copies == 1
* - near_copies == 2
*/
if (level == 0 && array.level == 10 && sra &&
array.layout == ((1 << 8) + 2) && !(array.raid_disks & 1)) {
if ((level == 0 && array.level == 10 && sra &&
array.layout == ((1 << 8) + 2) && !(array.raid_disks & 1)) ||
(level == 0 && array.level == 1 && sra)) {
int err;
err = remove_disks_on_raid10_to_raid0_takeover(st, sra, array.layout);
err = remove_disks_for_takeover(st, sra, array.layout);
if (err) {
dprintf(Name": Array cannot be reshaped\n");
if (cfd > -1)

6
super-intel.c
View File

@ -6916,6 +6916,12 @@ enum imsm_reshape_type imsm_analyze_change(struct supertype *st,
check_devs = 1;
}
break;
case 1:
if (geo->level == 0) {
change = CH_TAKEOVER;
check_devs = 1;
}
break;
case 5:
if (geo->level != 0)
change = CH_LEVEL_MIGRATION;