[PATCH] libceph: be explicit in masking bottom 16 bits

[Alex Elder <elder@inktank.com>]

In ceph_osdc_build_request() there is a call to cpu_to_le16() which
provides a 64-bit value as its argument.  Because of the implied
byte swapping going on it looked pretty suspect to me.

At the moment it turns out the behavior is well defined, but masking
off those bottom bits explicitly eliminates this distraction, and is
in fact more directly related to the purpose of the message header's
data_off field.

This resolves:
    http://tracker.ceph.com/issues/4125

Signed-off-by: Alex Elder <elder@inktank.com>
---
 net/ceph/osd_client.c |   14 ++++++++++++--
 1 file changed, 12 insertions(+), 2 deletions(-)

diff --git a/net/ceph/osd_client.c b/net/ceph/osd_client.c
index 3b6657f..015bf9f 100644
--- a/net/ceph/osd_client.c
+++ b/net/ceph/osd_client.c
@@ -419,8 +419,18 @@ void ceph_osdc_build_request(struct
ceph_osd_request *req,
 	p += 4;

 	/* data */
-	if (flags & CEPH_OSD_FLAG_WRITE)
-		req->r_request->hdr.data_off = cpu_to_le16(off);
+	if (flags & CEPH_OSD_FLAG_WRITE) {
+		u16 data_off;
+
+		/*
+		 * The header "data_off" is a hint to the receiver
+		 * allowing it to align received data into its
+		 * buffers such that there's no need to re-copy
+		 * it before writing it to disk (direct I/O).
+		 */
+		data_off = (u16) (off & 0xffff);
+		req->r_request->hdr.data_off = cpu_to_le16(data_off);
+	}
 	req->r_request->hdr.data_len = cpu_to_le32(data_len);

 	BUG_ON(p > msg->front.iov_base + msg->front.iov_len);
-- 
1.7.9.5