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| author | NeilBrown <neilb@suse.de> | 2009-03-31 14:57:20 +1100 |
|---|---|---|
| committer | NeilBrown <neilb@suse.de> | 2009-03-31 14:57:20 +1100 |
| commit | fc9739c6d626ee79a148ec367d143b0601299a9d (patch) | |
| tree | 492a3a29fe44fdd99d9177bef77b16a463a771f9 /drivers | |
| parent | e9d4758f6e93488dc719a1445ce54659a570938f (diff) | |
| download | linux-3.10-fc9739c6d626ee79a148ec367d143b0601299a9d.tar.gz linux-3.10-fc9739c6d626ee79a148ec367d143b0601299a9d.tar.bz2 linux-3.10-fc9739c6d626ee79a148ec367d143b0601299a9d.zip | |
md: add takeover support for converting raid6 back into raid5
If a raid6 is still in the layout that comes from converting raid5
into a raid6. this will allow us to convert it back again.
Signed-off-by: NeilBrown <neilb@suse.de>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/md/raid5.c | 35 |
1 files changed, 35 insertions, 0 deletions
diff --git a/drivers/md/raid5.c b/drivers/md/raid5.c index 95953273c4d..70b50af2bcd 100644 --- a/drivers/md/raid5.c +++ b/drivers/md/raid5.c @@ -4912,6 +4912,39 @@ static void *raid5_takeover_raid1(mddev_t *mddev) return setup_conf(mddev); } +static void *raid5_takeover_raid6(mddev_t *mddev) +{ + int new_layout; + + switch (mddev->layout) { + case ALGORITHM_LEFT_ASYMMETRIC_6: + new_layout = ALGORITHM_LEFT_ASYMMETRIC; + break; + case ALGORITHM_RIGHT_ASYMMETRIC_6: + new_layout = ALGORITHM_RIGHT_ASYMMETRIC; + break; + case ALGORITHM_LEFT_SYMMETRIC_6: + new_layout = ALGORITHM_LEFT_SYMMETRIC; + break; + case ALGORITHM_RIGHT_SYMMETRIC_6: + new_layout = ALGORITHM_RIGHT_SYMMETRIC; + break; + case ALGORITHM_PARITY_0_6: + new_layout = ALGORITHM_PARITY_0; + break; + case ALGORITHM_PARITY_N: + new_layout = ALGORITHM_PARITY_N; + break; + default: + return ERR_PTR(-EINVAL); + } + mddev->new_level = 5; + mddev->new_layout = new_layout; + mddev->delta_disks = -1; + mddev->raid_disks -= 1; + return setup_conf(mddev); +} + static int raid5_reconfig(mddev_t *mddev, int new_layout, int new_chunk) { @@ -4972,6 +5005,8 @@ static void *raid5_takeover(mddev_t *mddev) mddev->new_level = 5; return setup_conf(mddev); } + if (mddev->level == 6) + return raid5_takeover_raid6(mddev); return ERR_PTR(-EINVAL); } |