drbd: avoid to shrink max_bio_size due to peer re-configuration

For a long time, the receiving side has spread "too large" incoming
requests over multiple bios.  No need to shrink our max_bio_size
(max_hw_sectors) if the peer is reconfigured to use a different storage.

The problem manifests itself if we are not the top of the device stack
(DRBD is used a LVM PV).

A hardware reconfiguration on the peer may cause the supported
max_bio_size to shrink, and the connection handshake would now
unnecessarily shrink the max_bio_size on the active node.

There is no way to notify upper layers that they have to "re-stack"
their limits. So they won't notice at all, and may keep submitting bios
that are suddenly considered "too large for device".

We already check for compatibility and ignore changes on the peer,
the code only was masked out unless we have a fully established connection.
We just need to allow it a bit earlier during the handshake.

Also consider max_hw_sectors in our merge bvec function, just in case.

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>

diff --git a/drivers/block/drbd/drbd_nl.c b/drivers/block/drbd/drbd_nl.c
index 37dad18ba153a8ec1004fc3ac1c7e84e979d1f56..c706d50a8b0674aeabd58a548551b8898168b88e 100644 (file)
--- a/drivers/block/drbd/drbd_nl.c
+++ b/drivers/block/drbd/drbd_nl.c
@@ -1132,9 +1132,9 @@ void drbd_reconsider_max_bio_size(struct drbd_conf *mdev)
        /* We may ignore peer limits if the peer is modern enough.
           Because new from 8.3.8 onwards the peer can use multiple
           BIOs for a single peer_request */
-       if (mdev->state.conn >= C_CONNECTED) {
+       if (mdev->state.conn >= C_WF_REPORT_PARAMS) {
                if (mdev->tconn->agreed_pro_version < 94)
-                       peer = min( mdev->peer_max_bio_size, DRBD_MAX_SIZE_H80_PACKET);
+                       peer = min(mdev->peer_max_bio_size, DRBD_MAX_SIZE_H80_PACKET);
                        /* Correct old drbd (up to 8.3.7) if it believes it can do more than 32KiB */
                else if (mdev->tconn->agreed_pro_version == 94)
                        peer = DRBD_MAX_SIZE_H80_PACKET;

diff --git a/drivers/block/drbd/drbd_req.c b/drivers/block/drbd/drbd_req.c
index c24379ffd4e309cb0344f138854a131e12cc804e..fec7bef44994cf8b76e595f69b5e34b42cdaf230 100644 (file)
--- a/drivers/block/drbd/drbd_req.c
+++ b/drivers/block/drbd/drbd_req.c
@@ -1306,6 +1306,7 @@ int drbd_merge_bvec(struct request_queue *q, struct bvec_merge_data *bvm, struct
        int backing_limit;
 
        if (bio_size && get_ldev(mdev)) {
+               unsigned int max_hw_sectors = queue_max_hw_sectors(q);
                struct request_queue * const b =
                        mdev->ldev->backing_bdev->bd_disk->queue;
                if (b->merge_bvec_fn) {
@@ -1313,6 +1314,8 @@ int drbd_merge_bvec(struct request_queue *q, struct bvec_merge_data *bvm, struct
                        limit = min(limit, backing_limit);
                }
                put_ldev(mdev);
+               if ((limit >> 9) > max_hw_sectors)
+                       limit = max_hw_sectors << 9;
        }
        return limit;
 }