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ceph: reset front len on return to msgpool; BUG on mismatched front iov 

Reset msg front len when a message is returned to the pool: the caller
may have changed it.

BUG if we try to send a message with a hdr.front_len that doesn't match
the front iov.

Signed-off-by: Sage Weil <sage@newdream.net>
This commit is contained in:
Sage Weil 2010-03-01 15:25:00 -08:00
parent 70edb55bdf
commit 3ca02ef96e
2 changed files with 6 additions and 0 deletions
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2
fs/ceph/messenger.c
View File

@ -1954,6 +1954,8 @@ void ceph_con_send(struct ceph_connection *con, struct ceph_msg *msg)
msg->hdr.src.addr = con->msgr->my_enc_addr; msg->hdr.src.addr = con->msgr->my_enc_addr;
msg->hdr.orig_src = msg->hdr.src; msg->hdr.orig_src = msg->hdr.src;
BUG_ON(msg->front.iov_len != le32_to_cpu(msg->hdr.front_len));
/* queue */ /* queue */
mutex_lock(&con->mutex); mutex_lock(&con->mutex);
BUG_ON(!list_empty(&msg->list_head)); BUG_ON(!list_empty(&msg->list_head));

4
fs/ceph/msgpool.c
View File

@ -166,6 +166,10 @@ void ceph_msgpool_put(struct ceph_msgpool *pool, struct ceph_msg *msg)
{ {
spin_lock(&pool->lock); spin_lock(&pool->lock);
if (pool->num < pool->min) { if (pool->num < pool->min) {
/* reset msg front_len; user may have changed it */
msg->front.iov_len = pool->front_len;
msg->hdr.front_len = cpu_to_le32(pool->front_len);
kref_set(&msg->kref, 1); /* retake a single ref */ kref_set(&msg->kref, 1); /* retake a single ref */
list_add(&msg->list_head, &pool->msgs); list_add(&msg->list_head, &pool->msgs);
pool->num++; pool->num++;