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drbd: Finished the "on-no-data-accessible suspend-io;" functionality

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When no data is accessible (no connection to the peer, nor a local disk)
allow the user to select to freeze all IO operations instead of getting
IO errors.

Signed-off-by: Philipp Reisner <philipp.reisner@linbit.com>
Signed-off-by: Lars Ellenberg <lars.ellenberg@linbit.com>
This commit is contained in:
Philipp Reisner
2010-05-31 10:14:17 +02:00
parent 905cd7d8ac
commit 265be2d098
9 changed files with 90 additions and 1 deletions
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drivers/block/drbd/drbd_worker.c
+18
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@@ -1173,6 +1173,24 @@ int w_send_read_req(struct drbd_conf *mdev, struct drbd_work *w, int cancel)
return ok;
}
int w_restart_disk_io(struct drbd_conf *mdev, struct drbd_work *w, int cancel)
{
struct drbd_request *req = container_of(w, struct drbd_request, w);
if (bio_data_dir(req->master_bio) == WRITE)
drbd_al_begin_io(mdev, req->sector);
/* Calling drbd_al_begin_io() out of the worker might deadlocks
theoretically. Practically it can not deadlock, since this is
only used when unfreezing IOs. All the extents of the requests
that made it into the TL are already active */
drbd_req_make_private_bio(req, req->master_bio);
req->private_bio->bi_bdev = mdev->ldev->backing_bdev;
generic_make_request(req->private_bio);
return 1;
}
static int _drbd_may_sync_now(struct drbd_conf *mdev)
{
struct drbd_conf *odev = mdev;