ceph: kill ceph_osdc_writepages() "dosync" parameter

There is only one caller of ceph_osdc_writepages(), and it always
passes 0 as its "dosync" argument.  Get rid of that argument and
replace its use in ceph_osdc_writepages() with 0.
Signed-off-by: Alex Elder <elder@inktank.com>
Reviewed-by: Josh Durgin <josh.durgin@inktank.com>

fs/ceph/addr.c

@@ -493,7 +493,7 @@ static int writepage_nounlock(struct page *page, struct writeback_control *wbc)
 				   page_off, len,
 				   ci->i_truncate_seq, ci->i_truncate_size,
 				   &inode->i_mtime,
-				   &page, 1, 0, 0);
+				   &page, 1, 0);
 	if (err < 0) {
 		dout("writepage setting page/mapping error %d %p\n", err, page);
 		SetPageError(page);

include/linux/ceph/osd_client.h

@@ -275,7 +275,7 @@ extern int ceph_osdc_writepages(struct ceph_osd_client *osdc,
 				u32 truncate_seq, u64 truncate_size,
 				struct timespec *mtime,
 				struct page **pages, int nr_pages,
-				int flags, int do_sync);
+				int flags);
 
 /* watch/notify events */
 extern int ceph_osdc_create_event(struct ceph_osd_client *osdc,

net/ceph/osd_client.c

@@ -1867,7 +1867,7 @@ int ceph_osdc_writepages(struct ceph_osd_client *osdc, struct ceph_vino vino,
 			 u32 truncate_seq, u64 truncate_size,
 			 struct timespec *mtime,
 			 struct page **pages, int num_pages,
-			 int flags, int do_sync)
+			 int flags)
 {
 	struct ceph_osd_request *req;
 	int rc = 0;
@@ -1878,7 +1878,7 @@ int ceph_osdc_writepages(struct ceph_osd_client *osdc, struct ceph_vino vino,
 				    CEPH_OSD_OP_WRITE,
 				    flags | CEPH_OSD_FLAG_ONDISK |
 					    CEPH_OSD_FLAG_WRITE,
-				    snapc, do_sync,
+				    snapc, 0,
 				    truncate_seq, truncate_size, mtime,
 				    true, 1, page_align);
 	if (IS_ERR(req))