ceph: kill ceph_osdc_writepages() "nofail" parameter

There is only one caller of ceph_osdc_writepages(), and it always
passes the value true as its "nofail" argument.  Get rid of that
argument and replace its use in ceph_osdc_writepages() with the
constant value true.

This and a number of cleanup patches that follow resolve:
    http://tracker.ceph.com/issues/4126

Signed-off-by: Alex Elder <elder@inktank.com>
Reviewed-by: Josh Durgin <josh.durgin@inktank.com>
diff --git a/net/ceph/osd_client.c b/net/ceph/osd_client.c
index d9d58bb..dd01b13 100644
--- a/net/ceph/osd_client.c
+++ b/net/ceph/osd_client.c
@@ -1867,7 +1867,7 @@
 			 u32 truncate_seq, u64 truncate_size,
 			 struct timespec *mtime,
 			 struct page **pages, int num_pages,
-			 int flags, int do_sync, bool nofail)
+			 int flags, int do_sync)
 {
 	struct ceph_osd_request *req;
 	int rc = 0;
@@ -1880,7 +1880,7 @@
 					    CEPH_OSD_FLAG_WRITE,
 				    snapc, do_sync,
 				    truncate_seq, truncate_size, mtime,
-				    nofail, 1, page_align);
+				    true, 1, page_align);
 	if (IS_ERR(req))
 		return PTR_ERR(req);
 
@@ -1889,7 +1889,7 @@
 	dout("writepages %llu~%llu (%d pages)\n", off, len,
 	     req->r_num_pages);
 
-	rc = ceph_osdc_start_request(osdc, req, nofail);
+	rc = ceph_osdc_start_request(osdc, req, true);
 	if (!rc)
 		rc = ceph_osdc_wait_request(osdc, req);