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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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8
include/linux/drbd_limits.h
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@ -102,10 +102,12 @@
#define DRBD_RATE_DEF 250 /* kb/second */
/* less than 7 would hit performance unnecessarily.
* 3833 is the largest prime that still does fit
* into 64 sectors of activity log */
* 919 slots context information per transaction,
* 32k activity log, 4k transaction size,
* one transaction in flight:
* 919 * 7 = 6433 */
#define DRBD_AL_EXTENTS_MIN 7
#define DRBD_AL_EXTENTS_MAX 3833
#define DRBD_AL_EXTENTS_MAX 6433
#define DRBD_AL_EXTENTS_DEF 127
#define DRBD_AFTER_MIN -1