diff options
| author | Dan Williams <dan.j.williams@intel.com> | 2010-05-02 03:09:05 +0200 |
|---|---|---|
| committer | NeilBrown <neilb@suse.de> | 2010-05-18 07:27:57 +0200 |
| commit | f1b29bcae116409db5e543622aadab43041c9ae9 (patch) | |
| tree | 05dff62e747d8f0c91d6bd38ce900c0083dcbc98 /drivers/md/raid5.c | |
| parent | md/raid1: delay reads that could overtake behind-writes. (diff) | |
| download | linux-f1b29bcae116409db5e543622aadab43041c9ae9.tar.xz linux-f1b29bcae116409db5e543622aadab43041c9ae9.zip | |
md/raid4: permit raid0 takeover
For consistency allow raid4 to takeover raid0 in addition to raid5 (with a
raid4 layout).
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Diffstat (limited to 'drivers/md/raid5.c')
| -rw-r--r-- | drivers/md/raid5.c | 32 |
1 files changed, 17 insertions, 15 deletions
diff --git a/drivers/md/raid5.c b/drivers/md/raid5.c index 2882a26646fd..81563b7c0357 100644 --- a/drivers/md/raid5.c +++ b/drivers/md/raid5.c @@ -5610,10 +5610,17 @@ static void raid5_quiesce(mddev_t *mddev, int state) } -static void *raid5_takeover_raid0(mddev_t *mddev) +static void *raid45_takeover_raid0(mddev_t *mddev, int level) { + struct raid0_private_data *raid0_priv = mddev->private; - mddev->new_level = 5; + /* for raid0 takeover only one zone is supported */ + if (raid0_priv->nr_strip_zones > 1) { + printk(KERN_ERR "md: cannot takeover raid0 with more than one zone.\n"); + return ERR_PTR(-EINVAL); + } + + mddev->new_level = level; mddev->new_layout = ALGORITHM_PARITY_N; mddev->new_chunk_sectors = mddev->chunk_sectors; mddev->raid_disks += 1; @@ -5749,22 +5756,13 @@ static int raid6_check_reshape(mddev_t *mddev) static void *raid5_takeover(mddev_t *mddev) { /* raid5 can take over: - * raid0 - if all devices are the same - make it a raid4 layout + * raid0 - if there is only one strip zone - make it a raid4 layout * raid1 - if there are two drives. We need to know the chunk size * raid4 - trivial - just use a raid4 layout. * raid6 - Providing it is a *_6 layout */ - if (mddev->level == 0) { - /* for raid0 takeover only one zone is supported */ - struct raid0_private_data *raid0_priv - = mddev->private; - if (raid0_priv->nr_strip_zones > 1) { - printk(KERN_ERR "md: cannot takeover raid 0 with more than one zone.\n"); - return ERR_PTR(-EINVAL); - } - return raid5_takeover_raid0(mddev); - } - + if (mddev->level == 0) + return raid45_takeover_raid0(mddev, 5); if (mddev->level == 1) return raid5_takeover_raid1(mddev); if (mddev->level == 4) { @@ -5780,8 +5778,12 @@ static void *raid5_takeover(mddev_t *mddev) static void *raid4_takeover(mddev_t *mddev) { - /* raid4 can take over raid5 if layout is right. + /* raid4 can take over: + * raid0 - if there is only one strip zone + * raid5 - if layout is right */ + if (mddev->level == 0) + return raid45_takeover_raid0(mddev, 4); if (mddev->level == 5 && mddev->layout == ALGORITHM_PARITY_N) { mddev->new_layout = 0; |