tree c433c9be537b65ddbdff135cd25824a7cc09cdc8
parent c7b474474c793e9a82bd0d84868fdf7367c89696
author NeilBrown <neilb@suse.de> 1242105955 +1000
committer NeilBrown <neilb@suse.de> 1242105955 +1000

Create: add --reserve-space support to reserve space at the start of each device

This only works for 1.x metadata.
The idea is to reserve some space at the start of each device for
storing a boot loader.
As a boot loader will need sector 0, metadata 1.1 doesn't make sense.

The number given to reserve-space will be in kilobytes, though a
suffix of M can give Megabytes (or G gigabytes, but 2 is the limit).

When a spare is added to an array, we preserve the amount of reserved
space.

It is not yet possible to hot-add an internal bitmap to a 1.1 or 1.2
array with reserved space.

This option is not yet documented.

In future, we might copy the content of the reserved space from one
drive to any new spare that is added.

Signed-off-by: NeilBrown <neilb@suse.de>