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ceph: refactor messages data section allocation 

Signed-off-by: Yehuda Sadeh <yehuda@hq.newdream.net>
This commit is contained in:
Yehuda Sadeh 2010-01-11 10:32:02 -08:00 committed by Sage Weil
parent 2450418c47
commit 9d7f0f139e
1 changed files with 39 additions and 28 deletions
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67
fs/ceph/messenger.c
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@ -1315,7 +1315,7 @@ static int read_partial_message(struct ceph_connection *con)
struct ceph_msg *m = con->in_msg;
void *p;
int ret;
int to, want, left;
int to, left;
unsigned front_len, middle_len, data_len, data_off;
int datacrc = con->msgr->nocrc;
int skip;
@ -1351,6 +1351,7 @@ static int read_partial_message(struct ceph_connection *con)
data_len = le32_to_cpu(con->in_hdr.data_len);
if (data_len > CEPH_MSG_MAX_DATA_LEN)
return -EIO;
data_off = le16_to_cpu(con->in_hdr.data_off);
/* allocate message? */
if (!con->in_msg) {
@ -1375,7 +1376,10 @@ static int read_partial_message(struct ceph_connection *con)
m->front.iov_len = 0; /* haven't read it yet */
if (m->middle)
m->middle->vec.iov_len = 0;
memcpy(&m->hdr, &con->in_hdr, sizeof(con->in_hdr));
con->in_msg_pos.page = 0;
con->in_msg_pos.page_pos = data_off & ~PAGE_MASK;
con->in_msg_pos.data_pos = 0;
}
/* front */
@ -1393,31 +1397,6 @@ static int read_partial_message(struct ceph_connection *con)
}
/* (page) data */
data_off = le16_to_cpu(m->hdr.data_off);
if (data_len == 0)
goto no_data;
if (m->nr_pages == 0) {
con->in_msg_pos.page = 0;
con->in_msg_pos.page_pos = data_off & ~PAGE_MASK;
con->in_msg_pos.data_pos = 0;
/* find pages for data payload */
want = calc_pages_for(data_off & ~PAGE_MASK, data_len);
ret = -1;
mutex_unlock(&con->mutex);
if (con->ops->prepare_pages)
ret = con->ops->prepare_pages(con, m, want);
mutex_lock(&con->mutex);
if (ret < 0) {
dout("%p prepare_pages failed, skipping payload\n", m);
con->in_base_pos = -data_len - sizeof(m->footer);
ceph_msg_put(con->in_msg);
con->in_msg = NULL;
con->in_tag = CEPH_MSGR_TAG_READY;
return 0;
}
BUG_ON(m->nr_pages < want);
}
while (con->in_msg_pos.data_pos < data_len) {
left = min((int)(data_len - con->in_msg_pos.data_pos),
(int)(PAGE_SIZE - con->in_msg_pos.page_pos));
@ -1440,7 +1419,6 @@ static int read_partial_message(struct ceph_connection *con)
}
}
no_data:
/* footer */
to = sizeof(m->hdr) + sizeof(m->footer);
while (con->in_base_pos < to) {
@ -2136,6 +2114,25 @@ static int ceph_alloc_middle(struct ceph_connection *con, struct ceph_msg *msg)
return 0;
}
static int ceph_alloc_data_section(struct ceph_connection *con, struct ceph_msg *msg)
{
int ret;
int want;
int data_len = le32_to_cpu(msg->hdr.data_len);
unsigned data_off = le16_to_cpu(msg->hdr.data_off);
want = calc_pages_for(data_off & ~PAGE_MASK, data_len);
ret = -1;
mutex_unlock(&con->mutex);
if (con->ops->prepare_pages)
ret = con->ops->prepare_pages(con, msg, want);
mutex_lock(&con->mutex);
BUG_ON(msg->nr_pages < want);
return ret;
}
/*
* Generic message allocator, for incoming messages.
*/
@ -2146,6 +2143,7 @@ static struct ceph_msg *ceph_alloc_msg(struct ceph_connection *con,
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);
int data_len = le32_to_cpu(hdr->data_len);
struct ceph_msg *msg = NULL;
int ret;
@ -2166,6 +2164,7 @@ static struct ceph_msg *ceph_alloc_msg(struct ceph_connection *con,
return ERR_PTR(-ENOMEM);
}
}
memcpy(&msg->hdr, &con->in_hdr, sizeof(con->in_hdr));
if (middle_len) {
ret = ceph_alloc_middle(con, msg);
@ -2175,6 +2174,18 @@ static struct ceph_msg *ceph_alloc_msg(struct ceph_connection *con,
return msg;
}
}
if (data_len) {
ret = ceph_alloc_data_section(con, msg);
if (ret < 0) {
*skip = 1;
ceph_msg_put(msg);
return NULL;
}
}
return msg;
}