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md/raid5: enhance raid5_size to work correctly with negative delta_disks 

This is the first of four patches which combine to allow md/raid5 to
reduce the number of devices in the array by restriping the data over
a subset of the devices.

If the number of disks in a raid4/5/6 is being reduced, then the
default size must be based on the new number, not the old number
of devices.
In general, it should be based on the smaller of new and old.

Signed-off-by: NeilBrown <neilb@suse.de>
This commit is contained in:
NeilBrown 2009-03-31 15:10:36 +11:00
parent 34e04e87fb
commit 7ec0547838
1 changed files with 7 additions and 2 deletions
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9
drivers/md/raid5.c
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@ -4169,8 +4169,13 @@ raid5_size(mddev_t *mddev, sector_t sectors, int raid_disks)
if (!sectors)
sectors = mddev->dev_sectors;
if (!raid_disks)
raid_disks = conf->previous_raid_disks;
if (!raid_disks) {
/* size is defined by the smallest of previous and new size */
if (conf->raid_disks < conf->previous_raid_disks)
raid_disks = conf->raid_disks;
else
raid_disks = conf->previous_raid_disks;
}
sectors &= ~((sector_t)mddev->chunk_size/512 - 1);
return sectors * (raid_disks - conf->max_degraded);