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drbd: bitmap keep track of changes vs on-disk bitmap

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When we set or clear bits in a bitmap page,
also set a flag in the page->private pointer.

This allows us to skip writes of unchanged pages.

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
2010-12-15 08:59:11 +01:00
committed by Philipp Reisner
parent 95a0f10cdd
commit 19f843aa08
6 changed files with 374 additions and 221 deletions
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drivers/block/drbd/drbd_worker.c
+2 -5
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@@ -907,10 +907,8 @@ out:
drbd_md_sync(mdev);
if (test_and_clear_bit(WRITE_BM_AFTER_RESYNC, &mdev->flags)) {
dev_info(DEV, "Writing the whole bitmap\n");
drbd_queue_bitmap_io(mdev, &drbd_bm_write, NULL, "write from resync_finished");
}
dev_info(DEV, "Writing changed bitmap pages\n");
drbd_queue_bitmap_io(mdev, &drbd_bm_write, NULL, "write from resync_finished");
if (khelper_cmd)
drbd_khelper(mdev, khelper_cmd);
@@ -1127,7 +1125,6 @@ void drbd_ov_oos_found(struct drbd_conf *mdev, sector_t sector, int size)
mdev->ov_last_oos_size = size>>9;
}
drbd_set_out_of_sync(mdev, sector, size);
set_bit(WRITE_BM_AFTER_RESYNC, &mdev->flags);
}
int w_e_end_ov_reply(struct drbd_conf *mdev, struct drbd_work *w, int cancel)