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>
diff --git a/fs/ceph/osd_client.c b/fs/ceph/osd_client.c
index 3514f71..22a33f8 100644
--- a/fs/ceph/osd_client.c
+++ b/fs/ceph/osd_client.c
@@ -1087,45 +1087,6 @@
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 @@
}
/*
- * 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 @@
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 @@
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);