libceph: define mds_alloc_msg() method
The only user of the ceph messenger that doesn't define an alloc_msg
method is the mds client. Define one, such that it works just like
it did before, and simplify ceph_con_in_msg_alloc() by assuming the
alloc_msg method is always present.
This and the next patch resolve:
http://tracker.ceph.com/issues/4322
Signed-off-by: Alex Elder <elder@inktank.com>
Reviewed-by: Greg Farnum <greg@inktank.com>
diff --git a/net/ceph/messenger.c b/net/ceph/messenger.c
index 6ec6051..c7d4278 100644
--- a/net/ceph/messenger.c
+++ b/net/ceph/messenger.c
@@ -2804,55 +2804,34 @@
static int ceph_con_in_msg_alloc(struct ceph_connection *con, int *skip)
{
struct ceph_msg_header *hdr = &con->in_hdr;
- int type = le16_to_cpu(hdr->type);
- int front_len = le32_to_cpu(hdr->front_len);
int middle_len = le32_to_cpu(hdr->middle_len);
struct ceph_msg *msg;
int ret = 0;
BUG_ON(con->in_msg != NULL);
+ BUG_ON(!con->ops->alloc_msg);
- if (con->ops->alloc_msg) {
- mutex_unlock(&con->mutex);
- msg = con->ops->alloc_msg(con, hdr, skip);
- mutex_lock(&con->mutex);
- if (con->state != CON_STATE_OPEN) {
- if (msg)
- ceph_msg_put(msg);
- return -EAGAIN;
- }
- con->in_msg = msg;
- if (con->in_msg) {
- con->in_msg->con = con->ops->get(con);
- BUG_ON(con->in_msg->con == NULL);
- }
- if (*skip) {
- con->in_msg = NULL;
- return 0;
- }
- if (!con->in_msg) {
- con->error_msg =
- "error allocating memory for incoming message";
- return -ENOMEM;
- }
- }
- if (!con->in_msg) {
- mutex_unlock(&con->mutex);
- msg = ceph_msg_new(type, front_len, GFP_NOFS, false);
- mutex_lock(&con->mutex);
- if (!msg) {
- pr_err("unable to allocate msg type %d len %d\n",
- type, front_len);
- return -ENOMEM;
- }
- if (con->state != CON_STATE_OPEN) {
+ mutex_unlock(&con->mutex);
+ msg = con->ops->alloc_msg(con, hdr, skip);
+ mutex_lock(&con->mutex);
+ if (con->state != CON_STATE_OPEN) {
+ if (msg)
ceph_msg_put(msg);
- return -EAGAIN;
- }
- con->in_msg = msg;
+ return -EAGAIN;
+ }
+ con->in_msg = msg;
+ if (con->in_msg) {
con->in_msg->con = con->ops->get(con);
BUG_ON(con->in_msg->con == NULL);
- con->in_msg->page_alignment = le16_to_cpu(hdr->data_off);
+ }
+ if (*skip) {
+ con->in_msg = NULL;
+ return 0;
+ }
+ if (!con->in_msg) {
+ con->error_msg =
+ "error allocating memory for incoming message";
+ return -ENOMEM;
}
memcpy(&con->in_msg->hdr, &con->in_hdr, sizeof(con->in_hdr));