libceph: replace ceph_monc_request_next_osdmap()

... with a wrapper around maybe_request_map() - no need for two
osdmap-specific functions.

Signed-off-by: Ilya Dryomov <idryomov@gmail.com>

drivers/block/rbd.c

@@ -4902,7 +4902,7 @@ again:
 			return ret;
 
 		if (rbdc->client->osdc.osdmap->epoch < newest_epoch) {
-			ceph_monc_request_next_osdmap(&rbdc->client->monc);
+			ceph_osdc_maybe_request_map(&rbdc->client->osdc);
 			(void) ceph_monc_wait_osdmap(&rbdc->client->monc,
 						     newest_epoch,
 						     opts->mount_timeout);

include/linux/ceph/mon_client.h

@@ -128,7 +128,6 @@ bool ceph_monc_want_map(struct ceph_mon_client *monc, int sub, u32 epoch,
 void ceph_monc_got_map(struct ceph_mon_client *monc, int sub, u32 epoch);
 void ceph_monc_renew_subs(struct ceph_mon_client *monc);
 
-extern void ceph_monc_request_next_osdmap(struct ceph_mon_client *monc);
 extern int ceph_monc_wait_osdmap(struct ceph_mon_client *monc, u32 epoch,
 				 unsigned long timeout);
 

include/linux/ceph/osd_client.h

@@ -381,6 +381,7 @@ extern int ceph_osdc_wait_request(struct ceph_osd_client *osdc,
 extern void ceph_osdc_sync(struct ceph_osd_client *osdc);
 
 extern void ceph_osdc_flush_notifies(struct ceph_osd_client *osdc);
+void ceph_osdc_maybe_request_map(struct ceph_osd_client *osdc);
 
 extern int ceph_osdc_readpages(struct ceph_osd_client *osdc,
 			       struct ceph_vino vino,

net/ceph/mon_client.c

@@ -384,20 +384,6 @@ void ceph_monc_renew_subs(struct ceph_mon_client *monc)
 }
 EXPORT_SYMBOL(ceph_monc_renew_subs);
 
-/*
- * Register interest in the next osdmap
- */
-void ceph_monc_request_next_osdmap(struct ceph_mon_client *monc)
-{
-	dout("%s have %u\n", __func__, monc->subs[CEPH_SUB_OSDMAP].have);
-	mutex_lock(&monc->mutex);
-	if (__ceph_monc_want_map(monc, CEPH_SUB_OSDMAP,
-				 monc->subs[CEPH_SUB_OSDMAP].have + 1, false))
-		__send_subscribe(monc);
-	mutex_unlock(&monc->mutex);
-}
-EXPORT_SYMBOL(ceph_monc_request_next_osdmap);
-
 /*
  * Wait for an osdmap with a given epoch.
  *

net/ceph/osd_client.c

@@ -3869,6 +3869,13 @@ void ceph_osdc_flush_notifies(struct ceph_osd_client *osdc)
 }
 EXPORT_SYMBOL(ceph_osdc_flush_notifies);
 
+void ceph_osdc_maybe_request_map(struct ceph_osd_client *osdc)
+{
+	down_read(&osdc->lock);
+	maybe_request_map(osdc);
+	up_read(&osdc->lock);
+}
+EXPORT_SYMBOL(ceph_osdc_maybe_request_map);
 
 /*
  * init, shutdown