9p/net: Fix zero-copy path in the 9p virtio transport
authorChirantan Ekbote <chirantan@chromium.org>
Tue, 17 Jul 2018 00:35:29 +0000 (17:35 -0700)
committerDominique Martinet <dominique.martinet@cea.fr>
Mon, 13 Aug 2018 00:34:59 +0000 (09:34 +0900)
The zero-copy optimization when reading or writing large chunks of data
is quite useful.  However, the 9p messages created through the zero-copy
write path have an incorrect message size: it should be the size of the
header + size of the data being written but instead it's just the size
of the header.

This only works if the server ignores the size field of the message and
otherwise breaks the framing of the protocol. Fix this by re-writing the
message size field with the correct value.

Tested by running `dd if=/dev/zero of=out bs=4k count=1` inside a
virtio-9p mount.

Link: http://lkml.kernel.org/r/20180717003529.114368-1-chirantan@chromium.org
Signed-off-by: Chirantan Ekbote <chirantan@chromium.org>
Reviewed-by: Greg Kurz <groug@kaod.org>
Tested-by: Greg Kurz <groug@kaod.org>
Cc: Dylan Reid <dgreid@chromium.org>
Cc: Guenter Roeck <groeck@chromium.org>
Cc: stable@vger.kernel.org
Signed-off-by: Dominique Martinet <dominique.martinet@cea.fr>

index 3f69c428ddf957def2ebe9989afb5f99167223a9..bf61ca20e6a5ea88ed5fa9d9189d6cbbe58985b0 100644 (file)
@@ -406,6 +406,7 @@ p9_virtio_zc_request(struct p9_client *client, struct p9_req_t *req,
        p9_debug(P9_DEBUG_TRANS, "virtio request\n");
        if (uodata) {
+               __le32 sz;
                int n = p9_get_mapped_pages(chan, &out_pages, uodata,
                                            outlen, &offs, &need_drop);
                if (n < 0)
@@ -416,6 +417,12 @@ p9_virtio_zc_request(struct p9_client *client, struct p9_req_t *req,
                        memcpy(&req->tc->sdata[req->tc->size - 4], &v, 4);
                        outlen = n;
+               /* The size field of the message must include the length of the
+                * header and the length of the data.  We didn't actually know
+                * the length of the data until this point so add it in now.
+                */
+               sz = cpu_to_le32(req->tc->size + outlen);
+               memcpy(&req->tc->sdata[0], &sz, sizeof(sz));
        } else if (uidata) {
                int n = p9_get_mapped_pages(chan, &in_pages, uidata,
                                            inlen, &offs, &need_drop);