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| author | Lars Ellenberg <lars.ellenberg@linbit.com> | 2010-09-14 17:56:29 +0400 |
|---|---|---|
| committer | Philipp Reisner <philipp.reisner@linbit.com> | 2010-10-14 20:38:41 +0400 |
| commit | 8979d9c9e0bc8e54cf5bd7a89abb2145f087b5e1 (patch) | |
| tree | 2e22d97889ec466d954dd9db39de6b9ba5564703 /drivers/block/drbd/drbd_nl.c | |
| parent | fb22c402ffdf61dd121795b5809de587185d5240 (diff) | |
| download | linux-8979d9c9e0bc8e54cf5bd7a89abb2145f087b5e1.tar.xz | |
drbd: protocol compatibility for maximum packet sizes
Two missing corner cases to the "maximum packet size" handshake.
Signed-off-by: Philipp Reisner <philipp.reisner@linbit.com>
Signed-off-by: Lars Ellenberg <lars.ellenberg@linbit.com>
Diffstat (limited to 'drivers/block/drbd/drbd_nl.c')
| -rw-r--r-- | drivers/block/drbd/drbd_nl.c | 18 |
1 files changed, 15 insertions, 3 deletions
diff --git a/drivers/block/drbd/drbd_nl.c b/drivers/block/drbd/drbd_nl.c index 9ee44568dce3..9ae33a5bcf66 100644 --- a/drivers/block/drbd/drbd_nl.c +++ b/drivers/block/drbd/drbd_nl.c @@ -861,6 +861,7 @@ static int drbd_nl_disk_conf(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp struct inode *inode, *inode2; struct lru_cache *resync_lru = NULL; union drbd_state ns, os; + unsigned int max_seg_s; int rv; int cp_discovered = 0; int logical_block_size; @@ -1133,9 +1134,20 @@ static int drbd_nl_disk_conf(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp mdev->read_cnt = 0; mdev->writ_cnt = 0; - drbd_setup_queue_param(mdev, mdev->state.conn == C_CONNECTED && - mdev->agreed_pro_version < 95 ? - DRBD_MAX_SIZE_H80_PACKET : DRBD_MAX_SEGMENT_SIZE); + max_seg_s = DRBD_MAX_SEGMENT_SIZE; + if (mdev->state.conn == C_CONNECTED) { + /* We are Primary, Connected, and now attach a new local + * backing store. We must not increase the user visible maximum + * bio size on this device to something the peer may not be + * able to handle. */ + if (mdev->agreed_pro_version < 94) + max_seg_s = queue_max_segment_size(mdev->rq_queue); + else if (mdev->agreed_pro_version == 94) + max_seg_s = DRBD_MAX_SIZE_H80_PACKET; + /* else: drbd 8.3.9 and later, stay with default */ + } + + drbd_setup_queue_param(mdev, max_seg_s); /* If I am currently not R_PRIMARY, * but meta data primary indicator is set, |