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ceph: simplify page setup for incoming data 

Drop largely useless helper __prepare_pages(), and simplify sanity checks.

Signed-off-by: Sage Weil <sage@newdream.net>
This commit is contained in:
Sage Weil 2010-03-04 10:22:59 -08:00
parent 81a6cf2d30
commit 21b667f69b
1 changed files with 12 additions and 44 deletions
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56
fs/ceph/osd_client.c
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@ -1087,45 +1087,6 @@ bad:
return;
}
/*
* A read request prepares specific pages that data is to be read into.
* When a message is being read off the wire, we call prepare_pages to
* find those pages.
* 0 = success, -1 failure.
*/
static int __prepare_pages(struct ceph_connection *con,
struct ceph_msg_header *hdr,
struct ceph_osd_request *req,
u64 tid,
struct ceph_msg *m)
{
struct ceph_osd *osd = con->private;
struct ceph_osd_client *osdc;
int ret = -1;
int data_len = le32_to_cpu(hdr->data_len);
unsigned data_off = le16_to_cpu(hdr->data_off);
int want = calc_pages_for(data_off & ~PAGE_MASK, data_len);
if (!osd)
return -1;
osdc = osd->o_osdc;
dout("__prepare_pages on msg %p tid %llu, has %d pages, want %d\n", m,
tid, req->r_num_pages, want);
if (unlikely(req->r_num_pages < want))
goto out;
m->pages = req->r_pages;
m->nr_pages = req->r_num_pages;
ret = 0; /* success */
out:
BUG_ON(ret < 0 || m->nr_pages < want);
return ret;
}
/*
* Register request, send initial attempt.
*/
@ -1394,7 +1355,8 @@ static void dispatch(struct ceph_connection *con, struct ceph_msg *msg)
}
/*
* lookup and return message for incoming reply
* lookup and return message for incoming reply. set up reply message
* pages.
*/
static struct ceph_msg *get_reply(struct ceph_connection *con,
struct ceph_msg_header *hdr,
@ -1407,7 +1369,6 @@ static struct ceph_msg *get_reply(struct ceph_connection *con,
int front = le32_to_cpu(hdr->front_len);
int data_len = le32_to_cpu(hdr->data_len);
u64 tid;
int err;
tid = le64_to_cpu(hdr->tid);
mutex_lock(&osdc->request_mutex);
@ -1439,12 +1400,19 @@ static struct ceph_msg *get_reply(struct ceph_connection *con,
m = ceph_msg_get(req->r_reply);
if (data_len > 0) {
err = __prepare_pages(con, hdr, req, tid, m);
if (err < 0) {
unsigned data_off = le16_to_cpu(hdr->data_off);
int want = calc_pages_for(data_off & ~PAGE_MASK, data_len);
if (unlikely(req->r_num_pages < want)) {
pr_warning("tid %lld reply %d > expected %d pages\n",
tid, want, m->nr_pages);
*skip = 1;
ceph_msg_put(m);
m = ERR_PTR(err);
m = ERR_PTR(-EIO);
goto out;
}
m->pages = req->r_pages;
m->nr_pages = req->r_num_pages;
}
*skip = 0;
req->r_con_filling_msg = ceph_con_get(con);