drbd: cleanup ondisk meta data layout calculations and defines
authorLars Ellenberg <lars.ellenberg@linbit.com>
Tue, 19 Mar 2013 17:16:43 +0000 (18:16 +0100)
committerJens Axboe <axboe@kernel.dk>
Sat, 23 Mar 2013 00:13:59 +0000 (18:13 -0600)
commitae8bf312e97d554b6aa32e7b2ceb993812ad0835
tree7ed6d4fcf6385c1dbc694cf4f43f884436ae104a
parent9114d79569a3fb858a7ecb1f21cb1dec93dc2f21
drbd: cleanup ondisk meta data layout calculations and defines

Add a comment about our meta data layout variants,
and rename a few defines (e.g. MD_RESERVED_SECT -> MD_128MB_SECT)
to make it clear that they are short hand for fixed constants,
and not arbitrarily to be redefined as one may see fit.

Properly pad struct meta_data_on_disk to 4kB,
and initialize to zero not only the first 512 Byte,
but all of it in drbd_md_sync().

Signed-off-by: Philipp Reisner <philipp.reisner@linbit.com>
Signed-off-by: Lars Ellenberg <lars.ellenberg@linbit.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
drivers/block/drbd/drbd_actlog.c
drivers/block/drbd/drbd_bitmap.c
drivers/block/drbd/drbd_int.h
drivers/block/drbd/drbd_main.c
drivers/block/drbd/drbd_nl.c