btrfs: make btrfs_set_range_writeback() subpage compatible

Function btrfs_set_range_writeback() currently just sets the page
writeback unconditionally.

Change it to call the subpage helper so that we can handle both cases
well.

Since the subpage helpers needs btrfs_fs_info, also change the parameter
to accept btrfs_inode.

Tested-by: Ritesh Harjani <riteshh@linux.ibm.com> # [ppc64]
Tested-by: Anand Jain <anand.jain@oracle.com> # [aarch64]
Signed-off-by: Qu Wenruo <wqu@suse.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>

fs/btrfs/ctree.h

@@ -3157,7 +3157,7 @@ void btrfs_split_delalloc_extent(struct inode *inode,
 				 struct extent_state *orig, u64 split);
 int btrfs_bio_fits_in_stripe(struct page *page, size_t size, struct bio *bio,
 			     unsigned long bio_flags);
-void btrfs_set_range_writeback(struct extent_io_tree *tree, u64 start, u64 end);
+void btrfs_set_range_writeback(struct btrfs_inode *inode, u64 start, u64 end);
 vm_fault_t btrfs_page_mkwrite(struct vm_fault *vmf);
 int btrfs_readpage(struct file *file, struct page *page);
 void btrfs_evict_inode(struct inode *inode);

fs/btrfs/extent_io.c

@@ -3800,7 +3800,6 @@ static noinline_for_stack int __extent_writepage_io(struct btrfs_inode *inode,
 				 int *nr_ret)
 {
 	struct btrfs_fs_info *fs_info = inode->root->fs_info;
-	struct extent_io_tree *tree = &inode->io_tree;
 	u64 start = page_offset(page);
 	u64 end = start + PAGE_SIZE - 1;
 	u64 cur = start;
@@ -3879,7 +3878,7 @@ static noinline_for_stack int __extent_writepage_io(struct btrfs_inode *inode,
 			continue;
 		}
 
-		btrfs_set_range_writeback(tree, cur, cur + iosize - 1);
+		btrfs_set_range_writeback(inode, cur, cur + iosize - 1);
 		if (!PageWriteback(page)) {
 			btrfs_err(inode->root->fs_info,
 				   "page %lu not writeback, cur %llu end %llu",

fs/btrfs/inode.c

@@ -10234,17 +10234,21 @@ out:
 	return ret;
 }
 
-void btrfs_set_range_writeback(struct extent_io_tree *tree, u64 start, u64 end)
+void btrfs_set_range_writeback(struct btrfs_inode *inode, u64 start, u64 end)
 {
-	struct inode *inode = tree->private_data;
+	struct btrfs_fs_info *fs_info = inode->root->fs_info;
 	unsigned long index = start >> PAGE_SHIFT;
 	unsigned long end_index = end >> PAGE_SHIFT;
 	struct page *page;
+	u32 len;
 
+	ASSERT(end + 1 - start <= U32_MAX);
+	len = end + 1 - start;
 	while (index <= end_index) {
-		page = find_get_page(inode->i_mapping, index);
+		page = find_get_page(inode->vfs_inode.i_mapping, index);
 		ASSERT(page); /* Pages should be in the extent_io_tree */
-		set_page_writeback(page);
+
+		btrfs_page_set_writeback(fs_info, page, start, len);
 		put_page(page);
 		index++;
 	}