ceph: fix up some warnings on W=1 builds

Convert some decodes into unused variables into skips, and fix up some
non-kerneldoc comment headers to not start with "/**".
Signed-off-by: Jeff Layton <jlayton@kernel.org>
Signed-off-by: Ilya Dryomov <idryomov@gmail.com>

fs/ceph/caps.c

@@ -4028,15 +4028,13 @@ void ceph_handle_caps(struct ceph_mds_session *session,
 	}
 
 	if (msg_version >= 8) {
-		u64 flush_tid;
-		u32 caller_uid, caller_gid;
 		u32 pool_ns_len;
 
 		/* version >= 6 */
-		ceph_decode_64_safe(&p, end, flush_tid, bad);
+		ceph_decode_skip_64(&p, end, bad);	// flush_tid
 		/* version >= 7 */
-		ceph_decode_32_safe(&p, end, caller_uid, bad);
-		ceph_decode_32_safe(&p, end, caller_gid, bad);
+		ceph_decode_skip_32(&p, end, bad);	// caller_uid
+		ceph_decode_skip_32(&p, end, bad);	// caller_gid
 		/* version >= 8 */
 		ceph_decode_32_safe(&p, end, pool_ns_len, bad);
 		if (pool_ns_len > 0) {
@@ -4059,9 +4057,8 @@ void ceph_handle_caps(struct ceph_mds_session *session,
 	}
 
 	if (msg_version >= 11) {
-		u32 flags;
 		/* version >= 10 */
-		ceph_decode_32_safe(&p, end, flags, bad);
+		ceph_decode_skip_32(&p, end, bad); // flags
 		/* version >= 11 */
 		extra_info.dirstat_valid = true;
 		ceph_decode_64_safe(&p, end, extra_info.nfiles, bad);

fs/ceph/locks.c

@@ -57,7 +57,7 @@ static const struct file_lock_operations ceph_fl_lock_ops = {
 	.fl_release_private = ceph_fl_release_lock,
 };
 
-/**
+/*
  * Implement fcntl and flock locking functions.
  */
 static int ceph_lock_message(u8 lock_type, u16 operation, struct inode *inode,
@@ -225,7 +225,7 @@ static int try_unlock_file(struct file *file, struct file_lock *fl)
 	return 1;
 }
 
-/**
+/*
  * Attempt to set an fcntl lock.
  * For now, this just goes away to the server. Later it may be more awesome.
  */
@@ -408,7 +408,7 @@ static int lock_to_ceph_filelock(struct file_lock *lock,
 	return err;
 }
 
-/**
+/*
  * Encode the flock and fcntl locks for the given inode into the ceph_filelock
  * array. Must be called with inode->i_lock already held.
  * If we encounter more of a specific lock type than expected, return -ENOSPC.
@@ -458,7 +458,7 @@ int ceph_encode_locks_to_buffer(struct inode *inode,
 	return err;
 }
 
-/**
+/*
  * Copy the encoded flock and fcntl locks into the pagelist.
  * Format is: #fcntl locks, sequential fcntl locks, #flock locks,
  * sequential flock locks.

fs/ceph/mds_client.c

@@ -516,13 +516,9 @@ static int parse_reply_info_create(void **p, void *end,
 			/* Malformed reply? */
 			info->has_create_ino = false;
 		} else if (test_bit(CEPHFS_FEATURE_DELEG_INO, &s->s_features)) {
-			u8 struct_v, struct_compat;
-			u32 len;
-
 			info->has_create_ino = true;
-			ceph_decode_8_safe(p, end, struct_v, bad);
-			ceph_decode_8_safe(p, end, struct_compat, bad);
-			ceph_decode_32_safe(p, end, len, bad);
+			/* struct_v, struct_compat, and len */
+			ceph_decode_skip_n(p, end, 2 + sizeof(u32), bad);
 			ceph_decode_64_safe(p, end, info->ino, bad);
 			ret = ceph_parse_deleg_inos(p, end, s);
 			if (ret)
@@ -4860,10 +4856,8 @@ void ceph_mdsc_handle_fsmap(struct ceph_mds_client *mdsc, struct ceph_msg *msg)
 	void *p = msg->front.iov_base;
 	void *end = p + msg->front.iov_len;
 	u32 epoch;
-	u32 map_len;
 	u32 num_fs;
 	u32 mount_fscid = (u32)-1;
-	u8 struct_v, struct_cv;
 	int err = -EINVAL;
 
 	ceph_decode_need(&p, end, sizeof(u32), bad);
@@ -4871,24 +4865,17 @@ void ceph_mdsc_handle_fsmap(struct ceph_mds_client *mdsc, struct ceph_msg *msg)
 
 	dout("handle_fsmap epoch %u\n", epoch);
 
-	ceph_decode_need(&p, end, 2 + sizeof(u32), bad);
-	struct_v = ceph_decode_8(&p);
-	struct_cv = ceph_decode_8(&p);
-	map_len = ceph_decode_32(&p);
-
-	ceph_decode_need(&p, end, sizeof(u32) * 3, bad);
-	p += sizeof(u32) * 2; /* skip epoch and legacy_client_fscid */
+	/* struct_v, struct_cv, map_len, epoch, legacy_client_fscid */
+	ceph_decode_skip_n(&p, end, 2 + sizeof(u32) * 3, bad);
 
-	num_fs = ceph_decode_32(&p);
+	ceph_decode_32_safe(&p, end, num_fs, bad);
 	while (num_fs-- > 0) {
 		void *info_p, *info_end;
 		u32 info_len;
-		u8 info_v, info_cv;
 		u32 fscid, namelen;
 
 		ceph_decode_need(&p, end, 2 + sizeof(u32), bad);
-		info_v = ceph_decode_8(&p);
-		info_cv = ceph_decode_8(&p);
+		p += 2;		// info_v, info_cv
 		info_len = ceph_decode_32(&p);
 		ceph_decode_need(&p, end, info_len, bad);
 		info_p = p;