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authorDan Williams <dan.j.williams@intel.com>2009-03-17 18:10:40 -0700
committerDan Williams <dan.j.williams@intel.com>2009-03-31 14:57:49 +1100
commit80c3a6ce4ba4470379b9e6a4d9bcd9d2ee26ae03 (patch)
treede88622f05a7e681ac7bff7714e8f2d8953b66ac /drivers/md/raid0.c
parent93ed05e2a56b5ee06c0100a169433b11c4aa5d0b (diff)
downloadop-kernel-dev-80c3a6ce4ba4470379b9e6a4d9bcd9d2ee26ae03.zip
op-kernel-dev-80c3a6ce4ba4470379b9e6a4d9bcd9d2ee26ae03.tar.gz
md: add 'size' as a personality method
In preparation for giving userspace control over ->array_sectors we need to be able to retrieve the 'default' size, and the 'anticipated' size when a reshape is requested. For personalities that do not reshape emit a warning if anything but the default size is requested. In the raid5 case we need to update ->previous_raid_disks to make the new 'default' size available. Reviewed-by: Andre Noll <maan@systemlinux.org> Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Diffstat (limited to 'drivers/md/raid0.c')
-rw-r--r--drivers/md/raid0.c20
1 files changed, 16 insertions, 4 deletions
diff --git a/drivers/md/raid0.c b/drivers/md/raid0.c
index 9aebb4c..bb0df6a 100644
--- a/drivers/md/raid0.c
+++ b/drivers/md/raid0.c
@@ -263,12 +263,25 @@ static int raid0_mergeable_bvec(struct request_queue *q,
return max;
}
+static sector_t raid0_size(mddev_t *mddev, sector_t sectors, int raid_disks)
+{
+ sector_t array_sectors = 0;
+ mdk_rdev_t *rdev;
+
+ WARN_ONCE(sectors || raid_disks,
+ "%s does not support generic reshape\n", __func__);
+
+ list_for_each_entry(rdev, &mddev->disks, same_set)
+ array_sectors += rdev->sectors;
+
+ return array_sectors;
+}
+
static int raid0_run (mddev_t *mddev)
{
unsigned cur=0, i=0, nb_zone;
s64 sectors;
raid0_conf_t *conf;
- mdk_rdev_t *rdev;
if (mddev->chunk_size == 0) {
printk(KERN_ERR "md/raid0: non-zero chunk size required.\n");
@@ -293,9 +306,7 @@ static int raid0_run (mddev_t *mddev)
goto out_free_conf;
/* calculate array device size */
- mddev->array_sectors = 0;
- list_for_each_entry(rdev, &mddev->disks, same_set)
- mddev->array_sectors += rdev->sectors;
+ mddev->array_sectors = raid0_size(mddev, 0, 0);
printk(KERN_INFO "raid0 : md_size is %llu sectors.\n",
(unsigned long long)mddev->array_sectors);
@@ -511,6 +522,7 @@ static struct mdk_personality raid0_personality=
.run = raid0_run,
.stop = raid0_stop,
.status = raid0_status,
+ .size = raid0_size,
};
static int __init raid0_init (void)
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