From: Lars Ellenberg <lars.ellenberg@linbit.com>
Date: Tue, 19 Mar 2013 17:16:43 +0000 (+0100)
Subject: drbd: cleanup ondisk meta data layout calculations and defines
X-Git-Tag: omap-for-v3.10/fixes-for-merge-window-part2~10^2~53
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=ae8bf312e97d554b6aa32e7b2ceb993812ad0835;p=pandora-kernel.git

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>
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