On 03/04/2013 01:05 PM, Gregory Farnum wrote:
> This looks like a faithful reshuffling to me.
>
> But...
> On Mon, Mar 4, 2013 at 10:12 AM, Alex Elder <el...@inktank.com> wrote:
>> 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_alloc_middle(struct
>> ceph_connection *con, struct ceph_msg *msg)
>> 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;
>
> This looks like a memory leak to me? I'm not familiar with the skip
> infrastructure; is there something that cleans up those messages in
> the background, or should this actually be a BUG_ON?
It looks that way to me too, but the con->ops->get(con) call before
it makes it a little tricky. I will investigate and get back
to you, and if it is a leak I'll insert a fix for it ahead of this
in the series.
I really appreciate your reviewing these.
-Alex
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