NFSv4: include bitmap in nfsv4 get acl data

[pandora-kernel.git] / fs / nfs / nfs4xdr.c

diff --git a/fs/nfs/nfs4xdr.c b/fs/nfs/nfs4xdr.c
index e6161b2..dcaf693 100644 (file)
--- a/fs/nfs/nfs4xdr.c
+++ b/fs/nfs/nfs4xdr.c
@@ -2517,11 +2517,13 @@ static void nfs4_xdr_enc_getacl(struct rpc_rqst *req, struct xdr_stream *xdr,
        encode_compound_hdr(xdr, req, &hdr);
        encode_sequence(xdr, &args->seq_args, &hdr);
        encode_putfh(xdr, args->fh, &hdr);
-       replen = hdr.replen + op_decode_hdr_maxsz + nfs4_fattr_bitmap_maxsz + 1;
+       replen = hdr.replen + op_decode_hdr_maxsz + 1;
        encode_getattr_two(xdr, FATTR4_WORD0_ACL, 0, &hdr);
 
        xdr_inline_pages(&req->rq_rcv_buf, replen << 2,
                args->acl_pages, args->acl_pgbase, args->acl_len);
+       xdr_set_scratch_buffer(xdr, page_address(args->acl_scratch), PAGE_SIZE);
+
        encode_nops(&hdr);
 }
 
@@ -4957,17 +4959,18 @@ decode_restorefh(struct xdr_stream *xdr)
 }
 
 static int decode_getacl(struct xdr_stream *xdr, struct rpc_rqst *req,
-               size_t *acl_len)
+                        struct nfs_getaclres *res)
 {
-       __be32 *savep;
+       __be32 *savep, *bm_p;
        uint32_t attrlen,
                 bitmap[3] = {0};
        struct kvec *iov = req->rq_rcv_buf.head;
        int status;
 
-       *acl_len = 0;
+       res->acl_len = 0;
        if ((status = decode_op_hdr(xdr, OP_GETATTR)) != 0)
                goto out;
+       bm_p = xdr->p;
        if ((status = decode_attr_bitmap(xdr, bitmap)) != 0)
                goto out;
        if ((status = decode_attr_length(xdr, &attrlen, &savep)) != 0)
@@ -4979,18 +4982,30 @@ static int decode_getacl(struct xdr_stream *xdr, struct rpc_rqst *req,
                size_t hdrlen;
                u32 recvd;
 
+               /* The bitmap (xdr len + bitmaps) and the attr xdr len words
+                * are stored with the acl data to handle the problem of
+                * variable length bitmaps.*/
+               xdr->p = bm_p;
+               res->acl_data_offset = be32_to_cpup(bm_p) + 2;
+               res->acl_data_offset <<= 2;
+
                /* We ignore &savep and don't do consistency checks on
                 * the attr length.  Let userspace figure it out.... */
                hdrlen = (u8 *)xdr->p - (u8 *)iov->iov_base;
+               attrlen += res->acl_data_offset;
                recvd = req->rq_rcv_buf.len - hdrlen;
                if (attrlen > recvd) {
-                       dprintk("NFS: server cheating in getattr"
-                                       " acl reply: attrlen %u > recvd %u\n",
+                       if (res->acl_flags & NFS4_ACL_LEN_REQUEST) {
+                               /* getxattr interface called with a NULL buf */
+                               res->acl_len = attrlen;
+                               goto out;
+                       }
+                       dprintk("NFS: acl reply: attrlen %u > recvd %u\n",
                                        attrlen, recvd);
                        return -EINVAL;
                }
                xdr_read_pages(xdr, attrlen);
-               *acl_len = attrlen;
+               res->acl_len = attrlen;
        } else
                status = -EOPNOTSUPP;
 
@@ -6028,7 +6043,7 @@ nfs4_xdr_dec_getacl(struct rpc_rqst *rqstp, struct xdr_stream *xdr,
        status = decode_putfh(xdr);
        if (status)
                goto out;
-       status = decode_getacl(xdr, rqstp, &res->acl_len);
+       status = decode_getacl(xdr, rqstp, res);
 
 out:
        return status;