libceph: kill ceph_msg->pagelist_count

The pagelist_count field is never actually used, so get rid of it.
Signed-off-by: Alex Elder <elder@inktank.com>
Reviewed-by: Josh Durgin <josh.durgin@inktank.com>

fs/ceph/mds_client.c

@@ -2604,7 +2604,6 @@ static void send_mds_reconnect(struct ceph_mds_client *mdsc,
 	}
 
 	reply->pagelist = pagelist;
-	reply->pagelist_count = calc_pages_for(0, pagelist->length);
 	if (recon_state.flock)
 		reply->hdr.version = cpu_to_le16(2);
 	reply->hdr.data_len = cpu_to_le32(pagelist->length);

include/linux/ceph/messenger.h

@@ -78,7 +78,6 @@ struct ceph_msg {
 	unsigned page_count;		/* size of page array */
 	unsigned page_alignment;        /* io offset in first page */
 	struct ceph_pagelist *pagelist; /* instead of pages */
-	unsigned int pagelist_count;	/* number of pages in pagelist */
 
 	struct ceph_connection *con;
 	struct list_head list_head;

net/ceph/messenger.c

@@ -2718,7 +2718,6 @@ struct ceph_msg *ceph_msg_new(int type, int front_len, gfp_t flags,
 	m->page_count = 0;
 	m->page_alignment = 0;
 	m->pages = NULL;
-	m->pagelist_count = 0;
 	m->pagelist = NULL;
 #ifdef	CONFIG_BLOCK
 	m->bio = NULL;
@@ -2898,7 +2897,6 @@ void ceph_msg_last_put(struct kref *kref)
 		ceph_pagelist_release(m->pagelist);
 		kfree(m->pagelist);
 		m->pagelist = NULL;
-		m->pagelist_count = 0;
 	}
 
 	m->trail = NULL;