[PATCH RFC 11/24] nfsd: allow DELEGRETURN on directories

[Jeff Layton <jlayton@kernel.org>]

fh_verify only allows you to filter on a single type of inode, so have
nfsd4_delegreturn not filter by type. Once fh_verify returns, do the
appropriate check of the type and return an error if it's not a regular
file or directory.

Signed-off-by: Jeff Layton <jlayton@kernel.org>
---
 fs/nfsd/nfs4state.c | 14 +++++++++++++-
 1 file changed, 13 insertions(+), 1 deletion(-)

diff --git a/fs/nfsd/nfs4state.c b/fs/nfsd/nfs4state.c
index 17d09d72632b..c52e807f9672 100644
--- a/fs/nfsd/nfs4state.c
+++ b/fs/nfsd/nfs4state.c
@@ -7425,12 +7425,24 @@ nfsd4_delegreturn(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 	struct nfs4_delegation *dp;
 	stateid_t *stateid = &dr->dr_stateid;
 	struct nfs4_stid *s;
+	umode_t mode;
 	__be32 status;
 	struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
 
-	if ((status = fh_verify(rqstp, &cstate->current_fh, S_IFREG, 0)))
+	if ((status = fh_verify(rqstp, &cstate->current_fh, 0, 0)))
 		return status;
 
+	mode = d_inode(cstate->current_fh.fh_dentry)->i_mode & S_IFMT;
+	switch(mode) {
+	case S_IFREG:
+	case S_IFDIR:
+		break;
+	case S_IFLNK:
+		return nfserr_symlink;
+	default:
+		return nfserr_inval;
+	}
+
 	status = nfsd4_lookup_stateid(cstate, stateid, SC_TYPE_DELEG, 0, &s, nn);
 	if (status)
 		goto out;

-- 
2.44.0