NFSv4: Ensure continued open and lockowner name uniqueness
In order to enable migration support, we will want to move some of the
structures that are subject to migration into the struct nfs_server.
In particular, if we are to move the state_owner and state_owner_id to
being a per-filesystem structure, then we should label the resulting
open/lock owners with a per-filesytem label to ensure global uniqueness.
This patch does so by adding the super block s_dev to the open/lock owner
name.
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
diff --git a/fs/nfs/nfs4xdr.c b/fs/nfs/nfs4xdr.c
index 3cbdd0c..8e49688 100644
--- a/fs/nfs/nfs4xdr.c
+++ b/fs/nfs/nfs4xdr.c
@@ -71,8 +71,8 @@
/* lock,open owner id:
* we currently use size 2 (u64) out of (NFS4_OPAQUE_LIMIT >> 2)
*/
-#define open_owner_id_maxsz (1 + 4)
-#define lock_owner_id_maxsz (1 + 4)
+#define open_owner_id_maxsz (1 + 1 + 4)
+#define lock_owner_id_maxsz (1 + 1 + 4)
#define decode_lockowner_maxsz (1 + XDR_QUADLEN(IDMAP_NAMESZ))
#define compound_encode_hdr_maxsz (3 + (NFS4_MAXTAGLEN >> 2))
#define compound_decode_hdr_maxsz (3 + (NFS4_MAXTAGLEN >> 2))
@@ -1088,10 +1088,11 @@
{
__be32 *p;
- p = reserve_space(xdr, 28);
+ p = reserve_space(xdr, 32);
p = xdr_encode_hyper(p, lowner->clientid);
- *p++ = cpu_to_be32(16);
+ *p++ = cpu_to_be32(20);
p = xdr_encode_opaque_fixed(p, "lock id:", 8);
+ *p++ = cpu_to_be32(lowner->s_dev);
xdr_encode_hyper(p, lowner->id);
}
@@ -1210,10 +1211,11 @@
*p++ = cpu_to_be32(OP_OPEN);
*p = cpu_to_be32(arg->seqid->sequence->counter);
encode_share_access(xdr, arg->fmode);
- p = reserve_space(xdr, 28);
+ p = reserve_space(xdr, 32);
p = xdr_encode_hyper(p, arg->clientid);
- *p++ = cpu_to_be32(16);
+ *p++ = cpu_to_be32(20);
p = xdr_encode_opaque_fixed(p, "open id:", 8);
+ *p++ = cpu_to_be32(arg->server->s_dev);
xdr_encode_hyper(p, arg->id);
}