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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/multipath.c
parent93ed05e2a56b5ee06c0100a169433b11c4aa5d0b (diff)
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/multipath.c')
-rw-r--r--drivers/md/multipath.c11
1 files changed, 10 insertions, 1 deletions
diff --git a/drivers/md/multipath.c b/drivers/md/multipath.c
index 87accf74e4b..a3f6d8668bb 100644
--- a/drivers/md/multipath.c
+++ b/drivers/md/multipath.c
@@ -406,6 +406,14 @@ static void multipathd (mddev_t *mddev)
spin_unlock_irqrestore(&conf->device_lock, flags);
}
+static sector_t multipath_size(mddev_t *mddev, sector_t sectors, int raid_disks)
+{
+ WARN_ONCE(sectors || raid_disks,
+ "%s does not support generic reshape\n", __func__);
+
+ return mddev->dev_sectors;
+}
+
static int multipath_run (mddev_t *mddev)
{
multipath_conf_t *conf;
@@ -502,7 +510,7 @@ static int multipath_run (mddev_t *mddev)
/*
* Ok, everything is just fine now
*/
- mddev->array_sectors = mddev->dev_sectors;
+ mddev->array_sectors = multipath_size(mddev, 0, 0);
mddev->queue->unplug_fn = multipath_unplug;
mddev->queue->backing_dev_info.congested_fn = multipath_congested;
@@ -547,6 +555,7 @@ static struct mdk_personality multipath_personality =
.error_handler = multipath_error,
.hot_add_disk = multipath_add_disk,
.hot_remove_disk= multipath_remove_disk,
+ .size = multipath_size,
};
static int __init multipath_init (void)