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drbd: Fixed P_NEG_ACK processing for protocol A and B

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Protocol A has no P_WRITE_ACKs, but has P_NEG_ACKs.
The master bio might already be completed, therefore the
request is no longer in the collision hash.
=> Do not try to validate block_id as request

In Protocol B we might already have got a P_RECV_ACK
but then get a P_NEG_ACK after wards.

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 2011-01-17 18:39:18 +01:00
parent 94f2b05f03
commit 2deb8336d0
1 changed files with 33 additions and 12 deletions
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45
drivers/block/drbd/drbd_receiver.c
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@ -1633,9 +1633,6 @@ static int receive_Data(struct drbd_conf *mdev, enum drbd_packets cmd, unsigned
u32 dp_flags;
if (!get_ldev(mdev)) {
if (__ratelimit(&drbd_ratelimit_state))
dev_err(DEV, "Can not write mirrored data block "
"to local disk.\n");
spin_lock(&mdev->peer_seq_lock);
if (mdev->peer_seq+1 == be32_to_cpu(p->seq_num))
mdev->peer_seq++;
@ -4247,8 +4244,6 @@ static struct drbd_request *_ack_id_to_req(struct drbd_conf *mdev,
return req;
}
}
dev_err(DEV, "_ack_id_to_req: failed to find req %p, sector %llus in list\n",
(void *)(unsigned long)id, (unsigned long long)sector);
return NULL;
}
@ -4266,7 +4261,9 @@ static int validate_req_change_req_state(struct drbd_conf *mdev,
req = validator(mdev, id, sector);
if (unlikely(!req)) {
spin_unlock_irq(&mdev->req_lock);
dev_err(DEV, "%s: got a corrupt block_id/sector pair\n", func);
dev_err(DEV, "%s: failed to find req %p, sector %llus\n", func,
(void *)(unsigned long)id, (unsigned long long)sector);
return false;
}
__req_mod(req, what, &m);
@ -4321,20 +4318,44 @@ static int got_NegAck(struct drbd_conf *mdev, struct p_header80 *h)
{
struct p_block_ack *p = (struct p_block_ack *)h;
sector_t sector = be64_to_cpu(p->sector);
if (__ratelimit(&drbd_ratelimit_state))
dev_warn(DEV, "Got NegAck packet. Peer is in troubles?\n");
int size = be32_to_cpu(p->blksize);
struct drbd_request *req;
struct bio_and_error m;
update_peer_seq(mdev, be32_to_cpu(p->seq_num));
if (is_syncer_block_id(p->block_id)) {
int size = be32_to_cpu(p->blksize);
dec_rs_pending(mdev);
drbd_rs_failed_io(mdev, sector, size);
return true;
}
return validate_req_change_req_state(mdev, p->block_id, sector,
_ack_id_to_req, __func__ , neg_acked);
spin_lock_irq(&mdev->req_lock);
req = _ack_id_to_req(mdev, p->block_id, sector);
if (!req) {
spin_unlock_irq(&mdev->req_lock);
if (mdev->net_conf->wire_protocol == DRBD_PROT_A ||
mdev->net_conf->wire_protocol == DRBD_PROT_B) {
/* Protocol A has no P_WRITE_ACKs, but has P_NEG_ACKs.
The master bio might already be completed, therefore the
request is no longer in the collision hash.
=> Do not try to validate block_id as request. */
/* In Protocol B we might already have got a P_RECV_ACK
but then get a P_NEG_ACK after wards. */
drbd_set_out_of_sync(mdev, sector, size);
return true;
} else {
dev_err(DEV, "%s: failed to find req %p, sector %llus\n", __func__,
(void *)(unsigned long)p->block_id, (unsigned long long)sector);
return false;
}
}
__req_mod(req, neg_acked, &m);
spin_unlock_irq(&mdev->req_lock);
if (m.bio)
complete_master_bio(mdev, &m);
return true;
}
static int got_NegDReply(struct drbd_conf *mdev, struct p_header80 *h)