[PATCH] knfsd: nfsd4: fix corruption of returned data when using 64k pages

In v4 we grab an extra page just for the padding of returned data.  The
formula that the rpc server uses to allocate pages for the response doesn't
take into account this extra page.

Instead of adjusting those formulae, we adopt the same solution as v2 and v3,
and put the "tail" data in the same page as the "head" data.

Signed-off-by: J. Bruce Fields <bfields@citi.umich.edu>
Signed-off-by: Neil Brown <neilb@suse.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

1 files changed, 17 insertions, 25 deletions

diff --git a/fs/nfsd/nfs4xdr.c b/fs/nfsd/nfs4xdr.c
index 845f25251d81..f2710cfc0bc5 100644
--- a/fs/nfsd/nfs4xdr.c
+++ b/fs/nfsd/nfs4xdr.c
@@ -2084,27 +2084,20 @@ nfsd4_encode_read(struct nfsd4_compoundres *resp, int nfserr, struct nfsd4_read
         WRITE32(eof);
         WRITE32(maxcount);
         ADJUST_ARGS();
-        resp->xbuf->head[0].iov_len = ((char*)resp->p) - (char*)resp->xbuf->head[0].iov_base;
-
+        resp->xbuf->head[0].iov_len = (char*)p
+                                        - (char*)resp->xbuf->head[0].iov_base;
         resp->xbuf->page_len = maxcount;
 
-        /* read zero bytes -> don't set up tail */
-        if(!maxcount)
-                return 0;        
-
-        /* set up page for remaining responses */
-        svc_take_page(resp->rqstp);
-        resp->xbuf->tail[0].iov_base = 
-                page_address(resp->rqstp->rq_respages[resp->rqstp->rq_resused-1]);
-        resp->rqstp->rq_restailpage = resp->rqstp->rq_resused-1;
+        /* Use rest of head for padding and remaining ops: */
+        resp->rqstp->rq_restailpage = 0;
+        resp->xbuf->tail[0].iov_base = p;
         resp->xbuf->tail[0].iov_len = 0;
-        resp->p = resp->xbuf->tail[0].iov_base;
-        resp->end = resp->p + PAGE_SIZE/4;
-
         if (maxcount&3) {
-                *(resp->p)++ = 0;
+                RESERVE_SPACE(4);
+                WRITE32(0);
                 resp->xbuf->tail[0].iov_base += maxcount&3;
                 resp->xbuf->tail[0].iov_len = 4 - (maxcount&3);
+                ADJUST_ARGS();
         }
         return 0;
 }
@@ -2141,21 +2134,20 @@ nfsd4_encode_readlink(struct nfsd4_compoundres *resp, int nfserr, struct nfsd4_r
 
         WRITE32(maxcount);
         ADJUST_ARGS();
-        resp->xbuf->head[0].iov_len = ((char*)resp->p) - (char*)resp->xbuf->head[0].iov_base;
+        resp->xbuf->head[0].iov_len = (char*)p
+                                - (char*)resp->xbuf->head[0].iov_base;
+        resp->xbuf->page_len = maxcount;
 
-        svc_take_page(resp->rqstp);
-        resp->xbuf->tail[0].iov_base = 
-                page_address(resp->rqstp->rq_respages[resp->rqstp->rq_resused-1]);
-        resp->rqstp->rq_restailpage = resp->rqstp->rq_resused-1;
+        /* Use rest of head for padding and remaining ops: */
+        resp->rqstp->rq_restailpage = 0;
+        resp->xbuf->tail[0].iov_base = p;
         resp->xbuf->tail[0].iov_len = 0;
-        resp->p = resp->xbuf->tail[0].iov_base;
-        resp->end = resp->p + PAGE_SIZE/4;
-
-        resp->xbuf->page_len = maxcount;
         if (maxcount&3) {
-                *(resp->p)++ = 0;
+                RESERVE_SPACE(4);
+                WRITE32(0);
                 resp->xbuf->tail[0].iov_base += maxcount&3;
                 resp->xbuf->tail[0].iov_len = 4 - (maxcount&3);
+                ADJUST_ARGS();
         }
         return 0;
 }