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md: allow array to be resized while bitmap is present. 

Now that bitmaps can be resized, we can allow an array to be resized
while the bitmap is present.

This only covers resizing that involves changing the effective size
of member devices, not resizing that changes the number of devices.

Signed-off-by: NeilBrown <neilb@suse.de>
This commit is contained in:
NeilBrown 2012-05-22 13:55:27 +10:00
parent b81a040481
commit a4a6125a07
4 changed files with 28 additions and 13 deletions
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6
drivers/md/md.c
View File

@ -6153,11 +6153,7 @@ static int update_size(struct mddev *mddev, sector_t num_sectors)
*/
if (mddev->sync_thread)
return -EBUSY;
if (mddev->bitmap)
/* Sorry, cannot grow a bitmap yet, just remove it,
* grow, and re-add.
*/
return -EBUSY;
rdev_for_each(rdev, mddev) {
sector_t avail = rdev->sectors;

11
drivers/md/raid1.c
View File

@ -2752,9 +2752,16 @@ static int raid1_resize(struct mddev *mddev, sector_t sectors)
* any io in the removed space completes, but it hardly seems
* worth it.
*/
md_set_array_sectors(mddev, raid1_size(mddev, sectors, 0));
if (mddev->array_sectors > raid1_size(mddev, sectors, 0))
sector_t newsize = raid1_size(mddev, sectors, 0);
if (mddev->external_size &&
mddev->array_sectors > newsize)
return -EINVAL;
if (mddev->bitmap) {
int ret = bitmap_resize(mddev->bitmap, newsize, 0, 0);
if (ret)
return ret;
}
md_set_array_sectors(mddev, newsize);
set_capacity(mddev->gendisk, mddev->array_sectors);
revalidate_disk(mddev->gendisk);
if (sectors > mddev->dev_sectors &&

10
drivers/md/raid10.c
View File

@ -3678,9 +3678,15 @@ static int raid10_resize(struct mddev *mddev, sector_t sectors)
oldsize = raid10_size(mddev, 0, 0);
size = raid10_size(mddev, sectors, 0);
md_set_array_sectors(mddev, size);
if (mddev->array_sectors > size)
if (mddev->external_size &&
mddev->array_sectors > size)
return -EINVAL;
if (mddev->bitmap) {
int ret = bitmap_resize(mddev->bitmap, size, 0, 0);
if (ret)
return ret;
}
md_set_array_sectors(mddev, size);
set_capacity(mddev->gendisk, mddev->array_sectors);
revalidate_disk(mddev->gendisk);
if (sectors > mddev->dev_sectors &&

14
drivers/md/raid5.c
View File

@ -5503,12 +5503,18 @@ static int raid5_resize(struct mddev *mddev, sector_t sectors)
* any io in the removed space completes, but it hardly seems
* worth it.
*/
sector_t newsize;
sectors &= ~((sector_t)mddev->chunk_sectors - 1);
md_set_array_sectors(mddev, raid5_size(mddev, sectors,
mddev->raid_disks));
if (mddev->array_sectors >
raid5_size(mddev, sectors, mddev->raid_disks))
newsize = raid5_size(mddev, sectors, mddev->raid_disks);
if (mddev->external_size &&
mddev->array_sectors > newsize)
return -EINVAL;
if (mddev->bitmap) {
int ret = bitmap_resize(mddev->bitmap, sectors, 0, 0);
if (ret)
return ret;
}
md_set_array_sectors(mddev, newsize);
set_capacity(mddev->gendisk, mddev->array_sectors);
revalidate_disk(mddev->gendisk);
if (sectors > mddev->dev_sectors &&