ceph: pass the request to parse_reply_info_readdir()

Instead of passing just the r_reply_info to the readdir reply parser,
pass the request pointer directly instead. This will facilitate
implementing readdir on fscrypted directories.

Signed-off-by: Xiubo Li <xiubli@redhat.com>
Reviewed-by: Jeff Layton <jlayton@kernel.org>
Reviewed-and-tested-by: Luís Henriques <lhenriques@suse.de>
Reviewed-by: Milind Changire <mchangir@redhat.com>
Signed-off-by: Ilya Dryomov <idryomov@gmail.com>

Author: lxbsz

fs/ceph/mds_client.c

@@ -407,9 +407,10 @@ static int parse_reply_info_trace(void **p, void *end,
  * parse readdir results
  */
 static int parse_reply_info_readdir(void **p, void *end,
-				struct ceph_mds_reply_info_parsed *info,
-				u64 features)
+				    struct ceph_mds_request *req,
+				    u64 features)
 {
+	struct ceph_mds_reply_info_parsed *info = &req->r_reply_info;
 	u32 num, i = 0;
 	int err;
 
@@ -651,15 +652,16 @@ static int parse_reply_info_getvxattr(void **p, void *end,
  * parse extra results
  */
 static int parse_reply_info_extra(void **p, void *end,
-				  struct ceph_mds_reply_info_parsed *info,
+				  struct ceph_mds_request *req,
 				  u64 features, struct ceph_mds_session *s)
 {
+	struct ceph_mds_reply_info_parsed *info = &req->r_reply_info;
 	u32 op = le32_to_cpu(info->head->op);
 
 	if (op == CEPH_MDS_OP_GETFILELOCK)
 		return parse_reply_info_filelock(p, end, info, features);
 	else if (op == CEPH_MDS_OP_READDIR || op == CEPH_MDS_OP_LSSNAP)
-		return parse_reply_info_readdir(p, end, info, features);
+		return parse_reply_info_readdir(p, end, req, features);
 	else if (op == CEPH_MDS_OP_CREATE)
 		return parse_reply_info_create(p, end, info, features, s);
 	else if (op == CEPH_MDS_OP_GETVXATTR)
@@ -672,9 +674,9 @@ static int parse_reply_info_extra(void **p, void *end,
  * parse entire mds reply
  */
 static int parse_reply_info(struct ceph_mds_session *s, struct ceph_msg *msg,
-			    struct ceph_mds_reply_info_parsed *info,
-			    u64 features)
+			    struct ceph_mds_request *req, u64 features)
 {
+	struct ceph_mds_reply_info_parsed *info = &req->r_reply_info;
 	void *p, *end;
 	u32 len;
 	int err;
@@ -696,7 +698,7 @@ static int parse_reply_info(struct ceph_mds_session *s, struct ceph_msg *msg,
 	ceph_decode_32_safe(&p, end, len, bad);
 	if (len > 0) {
 		ceph_decode_need(&p, end, len, bad);
-		err = parse_reply_info_extra(&p, p+len, info, features, s);
+		err = parse_reply_info_extra(&p, p+len, req, features, s);
 		if (err < 0)
 			goto out_bad;
 	}
@@ -3598,14 +3600,15 @@ static void handle_reply(struct ceph_mds_session *session, struct ceph_msg *msg)
 	}
 
 	dout("handle_reply tid %lld result %d\n", tid, result);
-	rinfo = &req->r_reply_info;
 	if (test_bit(CEPHFS_FEATURE_REPLY_ENCODING, &session->s_features))
-		err = parse_reply_info(session, msg, rinfo, (u64)-1);
+		err = parse_reply_info(session, msg, req, (u64)-1);
 	else
-		err = parse_reply_info(session, msg, rinfo, session->s_con.peer_features);
+		err = parse_reply_info(session, msg, req,
+				       session->s_con.peer_features);
 	mutex_unlock(&mdsc->mutex);
 
 	/* Must find target inode outside of mutexes to avoid deadlocks */
+	rinfo = &req->r_reply_info;
 	if ((err >= 0) && rinfo->head->is_target) {
 		struct inode *in = xchg(&req->r_new_inode, NULL);
 		struct ceph_vino tvino = {