btrfs: extent_buffer_uptodate() make it static and inline

extent_buffer_uptodate() is a trivial wrapper around test_bit() and
nothing else. So make it static and inline, save on code space and call
indirection.

Before:
   text	   data	    bss	    dec	    hex	filename
1131257	  82898	  18992	1233147	 12d0fb	fs/btrfs/btrfs.ko

After:
   text	   data	    bss	    dec	    hex	filename
1131090	  82898	  18992	1232980	 12d054	fs/btrfs/btrfs.ko

Signed-off-by: Anand Jain <anand.jain@oracle.com>
Reviewed-by: Nikolay Borisov <nborisov@suse.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>

fs/btrfs/extent_io.c

@@ -5230,11 +5230,6 @@ void set_extent_buffer_uptodate(struct extent_buffer *eb)
 	}
 }
 
-int extent_buffer_uptodate(struct extent_buffer *eb)
-{
-	return test_bit(EXTENT_BUFFER_UPTODATE, &eb->bflags);
-}
-
 int read_extent_buffer_pages(struct extent_io_tree *tree,
 			     struct extent_buffer *eb, int wait, int mirror_num)
 {

fs/btrfs/extent_io.h

@@ -455,6 +455,11 @@ static inline void extent_buffer_get(struct extent_buffer *eb)
 	atomic_inc(&eb->refs);
 }
 
+static inline int extent_buffer_uptodate(struct extent_buffer *eb)
+{
+	return test_bit(EXTENT_BUFFER_UPTODATE, &eb->bflags);
+}
+
 int memcmp_extent_buffer(const struct extent_buffer *eb, const void *ptrv,
 			 unsigned long start, unsigned long len);
 void read_extent_buffer(const struct extent_buffer *eb, void *dst,
@@ -489,7 +494,6 @@ void clear_extent_buffer_dirty(struct extent_buffer *eb);
 int set_extent_buffer_dirty(struct extent_buffer *eb);
 void set_extent_buffer_uptodate(struct extent_buffer *eb);
 void clear_extent_buffer_uptodate(struct extent_buffer *eb);
-int extent_buffer_uptodate(struct extent_buffer *eb);
 int extent_buffer_under_io(struct extent_buffer *eb);
 int map_private_extent_buffer(const struct extent_buffer *eb,
 			      unsigned long offset, unsigned long min_len,