nfsd4: fix error return when pseudoroot missing
We really shouldn't hit this case at all, and forthcoming kernel and
nfs-utils changes should eliminate this case; if it does happen,
consider it a bug rather than reporting an error that doesn't really
make sense for the operation (since there's no reason for a server to be
accepting v4 traffic yet have no root filehandle).
Also move some exp_pseudoroot code into a helper function while we're
here.
Signed-off-by: J. Bruce Fields <bfields@citi.umich.edu>
diff --git a/fs/nfsd/export.c b/fs/nfsd/export.c
index c1c9e03..b73baba 100644
--- a/fs/nfsd/export.c
+++ b/fs/nfsd/export.c
@@ -1320,6 +1320,23 @@
return exp;
}
+static struct svc_export *find_fsidzero_export(struct svc_rqst *rqstp)
+{
+ struct svc_export *exp;
+ u32 fsidv[2];
+
+ mk_fsid(FSID_NUM, fsidv, 0, 0, 0, NULL);
+
+ exp = rqst_exp_find(rqstp, FSID_NUM, fsidv);
+ /*
+ * We shouldn't have accepting an nfsv4 request at all if we
+ * don't have a pseudoexport!:
+ */
+ if (IS_ERR(exp) && PTR_ERR(exp) == -ENOENT)
+ exp = ERR_PTR(-ESERVERFAULT);
+ return exp;
+}
+
/*
* Called when we need the filehandle for the root of the pseudofs,
* for a given NFSv4 client. The root is defined to be the
@@ -1330,11 +1347,8 @@
{
struct svc_export *exp;
__be32 rv;
- u32 fsidv[2];
- mk_fsid(FSID_NUM, fsidv, 0, 0, 0, NULL);
-
- exp = rqst_exp_find(rqstp, FSID_NUM, fsidv);
+ exp = find_fsidzero_export(rqstp);
if (IS_ERR(exp))
return nfserrno(PTR_ERR(exp));
rv = fh_compose(fhp, exp, exp->ex_path.dentry, NULL);