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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>
This commit is contained in:
Lars Ellenberg 2010-09-14 15:56:29 +02:00 committed by Philipp Reisner
parent fb22c402ff
commit 8979d9c9e0
2 changed files with 17 additions and 3 deletions
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18
drivers/block/drbd/drbd_nl.c
View File

@ -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,

2
drivers/block/drbd/drbd_receiver.c
View File

@ -3088,6 +3088,8 @@ static int receive_sizes(struct drbd_conf *mdev, enum drbd_packets cmd, unsigned
if (mdev->agreed_pro_version < 94)
max_seg_s = be32_to_cpu(p->max_segment_size);
else if (mdev->agreed_pro_version == 94)
max_seg_s = DRBD_MAX_SIZE_H80_PACKET;
else /* drbd 8.3.8 onwards */
max_seg_s = DRBD_MAX_SEGMENT_SIZE;