nfsd4: simplify xdr encoding of nfsv4 names
We can simplify the idmapping code if it does its own encoding and
returns nfs errors.
Signed-off-by: J. Bruce Fields <bfields@redhat.com>
diff --git a/fs/nfsd/nfs4idmap.c b/fs/nfsd/nfs4idmap.c
index 4832fd8..c0dfde6 100644
--- a/fs/nfsd/nfs4idmap.c
+++ b/fs/nfsd/nfs4idmap.c
@@ -551,27 +551,46 @@
return 0;
}
-static int
-idmap_id_to_name(struct svc_rqst *rqstp, int type, u32 id, char *name)
+static __be32 encode_ascii_id(u32 id, __be32 **p, int *buflen)
+{
+ char buf[11];
+ int len;
+ int bytes;
+
+ len = sprintf(buf, "%u", id);
+ bytes = 4 + (XDR_QUADLEN(len) << 2);
+ if (bytes > *buflen)
+ return nfserr_resource;
+ *p = xdr_encode_opaque(*p, buf, len);
+ *buflen -= bytes;
+ return 0;
+}
+
+static __be32 idmap_id_to_name(struct svc_rqst *rqstp, int type, u32 id, __be32 **p, int *buflen)
{
struct ent *item, key = {
.id = id,
.type = type,
};
int ret;
+ int bytes;
struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
strlcpy(key.authname, rqst_authname(rqstp), sizeof(key.authname));
ret = idmap_lookup(rqstp, idtoname_lookup, &key, nn->idtoname_cache, &item);
if (ret == -ENOENT)
- return sprintf(name, "%u", id);
+ return encode_ascii_id(id, p, buflen);
if (ret)
- return ret;
+ return nfserrno(ret);
ret = strlen(item->name);
- BUG_ON(ret > IDMAP_NAMESZ);
- memcpy(name, item->name, ret);
+ WARN_ON_ONCE(ret > IDMAP_NAMESZ);
+ bytes = 4 + (XDR_QUADLEN(ret) << 2);
+ if (bytes > *buflen)
+ return nfserr_resource;
+ *p = xdr_encode_opaque(*p, item->name, ret);
+ *buflen -= bytes;
cache_put(&item->h, nn->idtoname_cache);
- return ret;
+ return 0;
}
static bool
@@ -603,12 +622,11 @@
return idmap_name_to_id(rqstp, type, name, namelen, id);
}
-static int
-do_id_to_name(struct svc_rqst *rqstp, int type, u32 id, char *name)
+static __be32 encode_name_from_id(struct svc_rqst *rqstp, int type, u32 id, __be32 **p, int *buflen)
{
if (nfs4_disable_idmapping && rqstp->rq_cred.cr_flavor < RPC_AUTH_GSS)
- return sprintf(name, "%u", id);
- return idmap_id_to_name(rqstp, type, id, name);
+ return encode_ascii_id(id, p, buflen);
+ return idmap_id_to_name(rqstp, type, id, p, buflen);
}
__be32
@@ -637,16 +655,14 @@
return status;
}
-int
-nfsd_map_uid_to_name(struct svc_rqst *rqstp, kuid_t uid, char *name)
+__be32 nfsd4_encode_user(struct svc_rqst *rqstp, kuid_t uid, __be32 **p, int *buflen)
{
u32 id = from_kuid(&init_user_ns, uid);
- return do_id_to_name(rqstp, IDMAP_TYPE_USER, id, name);
+ return encode_name_from_id(rqstp, IDMAP_TYPE_USER, id, p, buflen);
}
-int
-nfsd_map_gid_to_name(struct svc_rqst *rqstp, kgid_t gid, char *name)
+__be32 nfsd4_encode_group(struct svc_rqst *rqstp, kgid_t gid, __be32 **p, int *buflen)
{
u32 id = from_kgid(&init_user_ns, gid);
- return do_id_to_name(rqstp, IDMAP_TYPE_GROUP, id, name);
+ return encode_name_from_id(rqstp, IDMAP_TYPE_GROUP, id, p, buflen);
}