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imsm: confirm raid10 layout, fix up handling raid10 failures 

1/ near-2 indeed matches how the Windows driver lays out the data
2/ update imsm_check_degraded to check for rebuilding disks in the
   raid10 case

Signed-off-by: Dan Williams <dan.j.williams@intel.com>
This commit is contained in:
Dan Williams 2008-10-15 14:15:47 -07:00
parent 5c3db629a6
commit c92a2527e1
1 changed files with 23 additions and 18 deletions
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41
super-intel.c
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@ -678,7 +678,7 @@ static int imsm_level_to_layout(int level)
case 6:
return ALGORITHM_LEFT_ASYMMETRIC;
case 10:
return 0x102; //FIXME is this correct?
return 0x102;
}
return -1;
}
@ -2310,30 +2310,35 @@ static __u8 imsm_check_degraded(struct intel_super *super, struct imsm_dev *dev,
case 10:
{
/**
* check to see if any mirrors have failed,
* otherwise we are degraded
* check to see if any mirrors have failed, otherwise we
* are degraded. Even numbered slots are mirrored on
* slot+1
*/
int device_per_mirror = 2; /* FIXME is this always the case?
* and are they always adjacent?
*/
int r10fail = 0;
int i;
int insync;
for (i = 0; i < map->num_members; i++) {
int idx = get_imsm_disk_idx(dev, i);
struct imsm_disk *disk = get_imsm_disk(super, idx);
__u32 ord = get_imsm_ord_tbl_ent(dev, i);
int idx = ord_to_idx(ord);
struct imsm_disk *disk;
if (!disk)
r10fail++;
else if (__le32_to_cpu(disk->status) & FAILED_DISK)
r10fail++;
/* reset the potential in-sync count on even-numbered
* slots. num_copies is always 2 for imsm raid10
*/
if ((i & 1) == 0)
insync = 2;
if (r10fail >= device_per_mirror)
disk = get_imsm_disk(super, idx);
if (!disk ||
__le32_to_cpu(disk->status) & FAILED_DISK ||
ord & IMSM_ORD_REBUILD)
insync--;
/* no in-sync disks left in this mirror the
* array has failed
*/
if (insync == 0)
return IMSM_T_STATE_FAILED;
/* reset 'r10fail' for next mirror set */
if (!((i + 1) % device_per_mirror))
r10fail = 0;
}
return IMSM_T_STATE_DEGRADED;