btrfs: merge btrfs_set_lock_blocking_rw with it's caller

The last caller that does not have a fixed value of lock is
btrfs_set_path_blocking, that actually does the same conditional swtich
by the lock type so we can merge the branches together and remove the
helper.
Reviewed-by: Johannes Thumshirn <jthumshirn@suse.de>
Signed-off-by: David Sterba <dsterba@suse.com>

fs/btrfs/ctree.c

@@ -46,11 +46,18 @@ noinline void btrfs_set_path_blocking(struct btrfs_path *p)
 	for (i = 0; i < BTRFS_MAX_LEVEL; i++) {
 		if (!p->nodes[i] || !p->locks[i])
 			continue;
-		btrfs_set_lock_blocking_rw(p->nodes[i], p->locks[i]);
-		if (p->locks[i] == BTRFS_READ_LOCK)
+		/*
+		 * If we currently have a spinning reader or writer lock this
+		 * will bump the count of blocking holders and drop the
+		 * spinlock.
+		 */
+		if (p->locks[i] == BTRFS_READ_LOCK) {
+			btrfs_set_lock_blocking_read(p->nodes[i]);
 			p->locks[i] = BTRFS_READ_LOCK_BLOCKING;
-		else if (p->locks[i] == BTRFS_WRITE_LOCK)
+		} else if (p->locks[i] == BTRFS_WRITE_LOCK) {
+			btrfs_set_lock_blocking_write(p->nodes[i]);
 			p->locks[i] = BTRFS_WRITE_LOCK_BLOCKING;
+		}
 	}
 }
 

fs/btrfs/locking.h

@@ -39,16 +39,4 @@ static inline void btrfs_tree_unlock_rw(struct extent_buffer *eb, int rw)
 		BUG();
 }
 
-/*
- * If we currently have a spinning reader or writer lock (indicated by the rw
- * flag) this will bump the count of blocking holders and drop the spinlock.
- */
-static inline void btrfs_set_lock_blocking_rw(struct extent_buffer *eb, int rw)
-{
-	if (rw == BTRFS_WRITE_LOCK)
-		btrfs_set_lock_blocking_write(eb);
-	else if (rw == BTRFS_READ_LOCK)
-		btrfs_set_lock_blocking_read(eb);
-}
-
 #endif