From 35f47ef1a1f069cd2f346314fb8212bb49571eac Mon Sep 17 00:00:00 2001 From: Lars Ellenberg Date: Wed, 23 Oct 2013 10:59:19 +0200 Subject: [PATCH] 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 Signed-off-by: Lars Ellenberg Signed-off-by: Jens Axboe --- drivers/block/drbd/drbd_nl.c | 4 ++-- drivers/block/drbd/drbd_req.c | 3 +++ 2 files changed, 5 insertions(+), 2 deletions(-) diff --git a/drivers/block/drbd/drbd_nl.c b/drivers/block/drbd/drbd_nl.c index 37dad18ba153..c706d50a8b06 100644 --- 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 c24379ffd4e3..fec7bef44994 100644 --- 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; } -- 2.39.5