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drbd: new on-disk activity log transaction format

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Use a new on-disk transaction format for the activity log, which allows
for multiple changes to the active set per transaction.

Using 4k transaction blocks, we can now get rid of the work-around code
to deal with devices not supporting 512 byte logical block size.

Signed-off-by: Philipp Reisner <philipp.reisner@linbit.com>
Signed-off-by: Lars Ellenberg <lars.ellenberg@linbit.com>
This commit is contained in:
Lars Ellenberg 2011-02-21 13:21:03 +01:00 • committed by Philipp Reisner
parent 46a15bc3ec
commit 7ad651b522
6 changed files with 300 additions and 207 deletions
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4
include/linux/drbd.h
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@ -336,6 +336,10 @@ enum drbd_timeout_flag {
#define DRBD_MAGIC 0x83740267
#define DRBD_MAGIC_BIG 0x835a
/* how I came up with this magic?
* base64 decode "actlog==" ;) */
#define DRBD_AL_MAGIC 0x69cb65a2
/* these are of type "int" */
#define DRBD_MD_INDEX_INTERNAL -1
#define DRBD_MD_INDEX_FLEX_EXT -2