btrfs: rename __extent_writepage() and drop double underscores

The function does not follow the pattern where the underscores would be
justified, so rename it.
Reviewed-by: Qu Wenruo <wqu@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>

fs/btrfs/extent_io.c

@@ -1177,7 +1177,7 @@ int btrfs_read_folio(struct file *file, struct folio *folio)
 }
 
 /*
- * helper for __extent_writepage, doing all of the delayed allocation setup.
+ * helper for extent_writepage(), doing all of the delayed allocation setup.
  *
  * This returns 1 if btrfs_run_delalloc_range function did all the work required
  * to write the page (copy into inline extent).  In this case the IO has
@@ -1398,14 +1398,14 @@ static int submit_one_sector(struct btrfs_inode *inode,
 }
 
 /*
- * helper for __extent_writepage.  This calls the writepage start hooks,
+ * Helper for extent_writepage().  This calls the writepage start hooks,
  * and does the loop to map the page into extents and bios.
  *
  * We return 1 if the IO is started and the page is unlocked,
  * 0 if all went well (page still locked)
  * < 0 if there were errors (page still locked)
  */
-static noinline_for_stack int __extent_writepage_io(struct btrfs_inode *inode,
+static noinline_for_stack int extent_writepage_io(struct btrfs_inode *inode,
 						  struct folio *folio,
 						  u64 start, u32 len,
 						  struct btrfs_bio_ctrl *bio_ctrl,
@@ -1500,7 +1500,7 @@ static noinline_for_stack int __extent_writepage_io(struct btrfs_inode *inode,
  * Return 0 if everything goes well.
  * Return <0 for error.
  */
-static int __extent_writepage(struct folio *folio, struct btrfs_bio_ctrl *bio_ctrl)
+static int extent_writepage(struct folio *folio, struct btrfs_bio_ctrl *bio_ctrl)
 {
 	struct inode *inode = folio->mapping->host;
 	const u64 page_start = folio_pos(folio);
@@ -1509,7 +1509,7 @@ static int __extent_writepage(struct folio *folio, struct btrfs_bio_ctrl *bio_ct
 	loff_t i_size = i_size_read(inode);
 	unsigned long end_index = i_size >> PAGE_SHIFT;
 
-	trace___extent_writepage(folio, inode, bio_ctrl->wbc);
+	trace_extent_writepage(folio, inode, bio_ctrl->wbc);
 
 	WARN_ON(!folio_test_locked(folio));
 
@@ -1534,7 +1534,7 @@ static int __extent_writepage(struct folio *folio, struct btrfs_bio_ctrl *bio_ct
 	if (ret)
 		goto done;
 
-	ret = __extent_writepage_io(BTRFS_I(inode), folio, folio_pos(folio),
+	ret = extent_writepage_io(BTRFS_I(inode), folio, folio_pos(folio),
 				  PAGE_SIZE, bio_ctrl, i_size);
 	if (ret == 1)
 		return 0;
@@ -2202,7 +2202,7 @@ static int extent_write_cache_pages(struct address_space *mapping,
 				continue;
 			}
 
-			ret = __extent_writepage(folio, bio_ctrl);
+			ret = extent_writepage(folio, bio_ctrl);
 			if (ret < 0) {
 				done = 1;
 				break;
@@ -2293,7 +2293,7 @@ void extent_write_locked_range(struct inode *inode, const struct folio *locked_f
 		if (pages_dirty && folio != locked_folio)
 			ASSERT(folio_test_dirty(folio));
 
-		ret = __extent_writepage_io(BTRFS_I(inode), folio, cur, cur_len,
+		ret = extent_writepage_io(BTRFS_I(inode), folio, cur, cur_len,
 					  &bio_ctrl, i_size);
 		if (ret == 1)
 			goto next_page;

fs/btrfs/inode.c

@@ -747,7 +747,7 @@ static noinline int cow_file_range_inline(struct btrfs_inode *inode,
 	/*
 	 * In the successful case (ret == 0 here), cow_file_range will return 1.
 	 *
-	 * Quite a bit further up the callstack in __extent_writepage, ret == 1
+	 * Quite a bit further up the callstack in extent_writepage(), ret == 1
 	 * is treated as a short circuited success and does not unlock the folio,
 	 * so we must do it here.
 	 *

fs/btrfs/subpage.c

@@ -705,7 +705,7 @@ void btrfs_folio_assert_not_dirty(const struct btrfs_fs_info *fs_info,
  * - Page locked by plain lock_page()
  *   It should not have any subpage::writers count.
  *   Can be unlocked by unlock_page().
- *   This is the most common locked page for __extent_writepage() called
+ *   This is the most common locked page for extent_writepage() called
  *   inside extent_write_cache_pages().
  *   Rarer cases include the @locked_page from extent_write_locked_range().
  *
@@ -829,7 +829,7 @@ bool btrfs_subpage_find_writer_locked(const struct btrfs_fs_info *fs_info,
  * Unlike btrfs_folio_end_writer_lock() which unlocks a specified subpage range,
  * this ends all writer locked ranges of a page.
  *
- * This is for the locked page of __extent_writepage(), as the locked page
+ * This is for the locked page of extent_writepage(), as the locked page
  * can contain several locked subpage ranges.
  */
 void btrfs_folio_end_all_writers(const struct btrfs_fs_info *fs_info, struct folio *folio)

include/trace/events/btrfs.h

@@ -721,7 +721,7 @@ DECLARE_EVENT_CLASS(btrfs__writepage,
 		  __entry->writeback_index)
 );
 
-DEFINE_EVENT(btrfs__writepage, __extent_writepage,
+DEFINE_EVENT(btrfs__writepage, extent_writepage,
 
 	TP_PROTO(const struct folio *folio, const struct inode *inode,
 		 const struct writeback_control *wbc),