diff options
| author | Krzysztof Wojcik <krzysztof.wojcik@intel.com> | 2011-01-31 13:47:13 +1100 |
|---|---|---|
| committer | NeilBrown <neilb@suse.de> | 2011-01-31 13:47:13 +1100 |
| commit | fc3a08b85b7a4f6c1069e5f71f6ad40d925ff55b (patch) | |
| tree | 1d23e67decd38615a38a50769c264f3a2636d582 /drivers/md/raid0.c | |
| parent | f21e9ff7f77d41ceca4e1e5ee5a4efa5ad7a5e40 (diff) | |
| download | linux-fc3a08b85b7a4f6c1069e5f71f6ad40d925ff55b.tar.bz2 | |
Add raid1->raid0 takeover support
This patch introduces raid 1 to raid0 takeover operation
in kernel space.
Signed-off-by: Krzysztof Wojcik <krzysztof.wojcik@intel.com>
Signed-off-by: Neil Brown <neilb@nbeee.brown>
Diffstat (limited to 'drivers/md/raid0.c')
| -rw-r--r-- | drivers/md/raid0.c | 40 |
1 files changed, 40 insertions, 0 deletions
diff --git a/drivers/md/raid0.c b/drivers/md/raid0.c index a39f4c355e55..637a96855edb 100644 --- a/drivers/md/raid0.c +++ b/drivers/md/raid0.c @@ -179,6 +179,14 @@ static int create_strip_zones(mddev_t *mddev, raid0_conf_t **private_conf) rdev1->new_raid_disk = j; } + if (mddev->level == 1) { + /* taiking over a raid1 array- + * we have only one active disk + */ + j = 0; + rdev1->new_raid_disk = j; + } + if (j < 0 || j >= mddev->raid_disks) { printk(KERN_ERR "md/raid0:%s: bad disk number %d - " "aborting!\n", mdname(mddev), j); @@ -644,12 +652,38 @@ static void *raid0_takeover_raid10(mddev_t *mddev) return priv_conf; } +static void *raid0_takeover_raid1(mddev_t *mddev) +{ + raid0_conf_t *priv_conf; + + /* Check layout: + * - (N - 1) mirror drives must be already faulty + */ + if ((mddev->raid_disks - 1) != mddev->degraded) { + printk(KERN_ERR "md/raid0:%s: (N - 1) mirrors drives must be already faulty!\n", + mdname(mddev)); + return ERR_PTR(-EINVAL); + } + + /* Set new parameters */ + mddev->new_level = 0; + mddev->new_layout = 0; + mddev->new_chunk_sectors = 128; /* by default set chunk size to 64k */ + mddev->delta_disks = 1 - mddev->raid_disks; + /* make sure it will be not marked as dirty */ + mddev->recovery_cp = MaxSector; + + create_strip_zones(mddev, &priv_conf); + return priv_conf; +} + static void *raid0_takeover(mddev_t *mddev) { /* raid0 can take over: * raid4 - if all data disks are active. * raid5 - providing it is Raid4 layout and one disk is faulty * raid10 - assuming we have all necessary active disks + * raid1 - with (N -1) mirror drives faulty */ if (mddev->level == 4) return raid0_takeover_raid45(mddev); @@ -665,6 +699,12 @@ static void *raid0_takeover(mddev_t *mddev) if (mddev->level == 10) return raid0_takeover_raid10(mddev); + if (mddev->level == 1) + return raid0_takeover_raid1(mddev); + + printk(KERN_ERR "Takeover from raid%i to raid0 not supported\n", + mddev->level); + return ERR_PTR(-EINVAL); } |