ext4: use ext4_ext_next_allocated_block instead of mext_next_extent

This allows us to make mext_next_extent static and potentially get rid
of it.
Signed-off-by: Dmitry Monakhov <dmonakhov@openvz.org>
Signed-off-by: Theodore Ts'o <tytso@mit.edu>

fs/ext4/ext4.h

@@ -2753,8 +2753,6 @@ extern void ext4_double_up_write_data_sem(struct inode *orig_inode,
 extern int ext4_move_extents(struct file *o_filp, struct file *d_filp,
 			     __u64 start_orig, __u64 start_donor,
 			     __u64 len, __u64 *moved_len);
-extern int mext_next_extent(struct inode *inode, struct ext4_ext_path *path,
-			    struct ext4_extent **extent);
 
 /* page-io.c */
 extern int __init ext4_init_pageio(void);

fs/ext4/extents.c

@@ -5304,7 +5304,7 @@ ext4_ext_shift_extents(struct inode *inode, handle_t *handle,
 	struct ext4_ext_path *path;
 	int ret = 0, depth;
 	struct ext4_extent *extent;
-	ext4_lblk_t stop_block, current_block;
+	ext4_lblk_t stop_block;
 	ext4_lblk_t ex_start, ex_end;
 
 	/* Let path point to the last extent */
@@ -5365,17 +5365,15 @@ ext4_ext_shift_extents(struct inode *inode, handle_t *handle,
 					 (unsigned long) start);
 			return -EIO;
 		}
-
-		current_block = le32_to_cpu(extent->ee_block);
-		if (start > current_block) {
+		if (start > le32_to_cpu(extent->ee_block)) {
 			/* Hole, move to the next extent */
-			ret = mext_next_extent(inode, path, &extent);
-			if (ret != 0) {
+			if (extent < EXT_LAST_EXTENT(path[depth].p_hdr)) {
+				path[depth].p_ext++;
+			} else {
+				start = ext4_ext_next_allocated_block(path);
 				ext4_ext_drop_refs(path);
 				kfree(path);
-				if (ret == 1)
-					ret = 0;
-				break;
+				continue;
 			}
 		}
 		ret = ext4_ext_shift_path_extents(path, shift, inode,

fs/ext4/move_extent.c

@@ -76,7 +76,7 @@ copy_extent_status(struct ext4_extent *src, struct ext4_extent *dest)
  * ext4_ext_path structure refers to the last extent, or a negative error
  * value on failure.
  */
-int
+static int
 mext_next_extent(struct inode *inode, struct ext4_ext_path *path,
 		      struct ext4_extent **extent)
 {