btrfs: update the writepage tracepoint to take a folio

Willy is wanting to get rid of page->index, convert the writepage
tracepoint to take a folio so we can do folio->index instead of
page->index.
Signed-off-by: Josef Bacik <josef@toxicpanda.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>

fs/btrfs/extent_io.c

@@ -1531,7 +1531,7 @@ static int __extent_writepage(struct page *page, struct btrfs_bio_ctrl *bio_ctrl
 	loff_t i_size = i_size_read(inode);
 	unsigned long end_index = i_size >> PAGE_SHIFT;
 
-	trace___extent_writepage(page, inode, bio_ctrl->wbc);
+	trace___extent_writepage(folio, inode, bio_ctrl->wbc);
 
 	WARN_ON(!PageLocked(page));
 

include/trace/events/btrfs.h

@@ -674,10 +674,10 @@ TRACE_EVENT(btrfs_finish_ordered_extent,
 
 DECLARE_EVENT_CLASS(btrfs__writepage,
 
-	TP_PROTO(const struct page *page, const struct inode *inode,
+	TP_PROTO(const struct folio *folio, const struct inode *inode,
 		 const struct writeback_control *wbc),
 
-	TP_ARGS(page, inode, wbc),
+	TP_ARGS(folio, inode, wbc),
 
 	TP_STRUCT__entry_btrfs(
 		__field(	u64,	ino			)
@@ -695,7 +695,7 @@ DECLARE_EVENT_CLASS(btrfs__writepage,
 
 	TP_fast_assign_btrfs(btrfs_sb(inode->i_sb),
 		__entry->ino		= btrfs_ino(BTRFS_I(inode));
-		__entry->index		= page->index;
+		__entry->index		= folio->index;
 		__entry->nr_to_write	= wbc->nr_to_write;
 		__entry->pages_skipped	= wbc->pages_skipped;
 		__entry->range_start	= wbc->range_start;
@@ -723,10 +723,10 @@ DECLARE_EVENT_CLASS(btrfs__writepage,
 
 DEFINE_EVENT(btrfs__writepage, __extent_writepage,
 
-	TP_PROTO(const struct page *page, const struct inode *inode,
+	TP_PROTO(const struct folio *folio, const struct inode *inode,
 		 const struct writeback_control *wbc),
 
-	TP_ARGS(page, inode, wbc)
+	TP_ARGS(folio, inode, wbc)
 );
 
 TRACE_EVENT(btrfs_writepage_end_io_hook,