ext4: Convert invalidatepage to invalidate_folio

Extensive changes, but fairly mechanical.
Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Tested-by: Damien Le Moal <damien.lemoal@opensource.wdc.com>
Acked-by: Damien Le Moal <damien.lemoal@opensource.wdc.com>
Tested-by: Mike Marshall <hubcap@omnibond.com> # orangefs
Tested-by: David Howells <dhowells@redhat.com> # afs

fs/ext4/inode.c

@@ -184,7 +184,7 @@ void ext4_evict_inode(struct inode *inode)
 		 * journal. So although mm thinks everything is clean and
 		 * ready for reaping the inode might still have some pages to
 		 * write in the running transaction or waiting to be
-		 * checkpointed. Thus calling jbd2_journal_invalidatepage()
+		 * checkpointed. Thus calling jbd2_journal_invalidate_folio()
 		 * (via truncate_inode_pages()) to discard these buffers can
 		 * cause data loss. Also even if we did not discard these
 		 * buffers, we would have no way to find them after the inode
@@ -3186,7 +3186,7 @@ static void ext4_readahead(struct readahead_control *rac)
 static void ext4_invalidate_folio(struct folio *folio, size_t offset,
 				size_t length)
 {
-	trace_ext4_invalidatepage(&folio->page, offset, length);
+	trace_ext4_invalidate_folio(folio, offset, length);
 
 	/* No journalling happens on data buffers when this function is used */
 	WARN_ON(folio_buffers(folio) && buffer_jbd(folio_buffers(folio)));
@@ -3194,29 +3194,28 @@ static void ext4_invalidate_folio(struct folio *folio, size_t offset,
 	block_invalidate_folio(folio, offset, length);
 }
 
-static int __ext4_journalled_invalidatepage(struct page *page,
-					    unsigned int offset,
-					    unsigned int length)
+static int __ext4_journalled_invalidate_folio(struct folio *folio,
+					    size_t offset, size_t length)
 {
-	journal_t *journal = EXT4_JOURNAL(page->mapping->host);
+	journal_t *journal = EXT4_JOURNAL(folio->mapping->host);
 
-	trace_ext4_journalled_invalidatepage(page, offset, length);
+	trace_ext4_journalled_invalidate_folio(folio, offset, length);
 
 	/*
 	 * If it's a full truncate we just forget about the pending dirtying
 	 */
-	if (offset == 0 && length == PAGE_SIZE)
-		ClearPageChecked(page);
+	if (offset == 0 && length == folio_size(folio))
+		folio_clear_checked(folio);
 
-	return jbd2_journal_invalidatepage(journal, page, offset, length);
+	return jbd2_journal_invalidate_folio(journal, folio, offset, length);
 }
 
 /* Wrapper for aops... */
-static void ext4_journalled_invalidatepage(struct page *page,
-					   unsigned int offset,
-					   unsigned int length)
+static void ext4_journalled_invalidate_folio(struct folio *folio,
+					   size_t offset,
+					   size_t length)
 {
-	WARN_ON(__ext4_journalled_invalidatepage(page, offset, length) < 0);
+	WARN_ON(__ext4_journalled_invalidate_folio(folio, offset, length) < 0);
 }
 
 static int ext4_releasepage(struct page *page, gfp_t wait)
@@ -3601,7 +3600,7 @@ static const struct address_space_operations ext4_journalled_aops = {
 	.write_end		= ext4_journalled_write_end,
 	.set_page_dirty		= ext4_journalled_set_page_dirty,
 	.bmap			= ext4_bmap,
-	.invalidatepage		= ext4_journalled_invalidatepage,
+	.invalidate_folio	= ext4_journalled_invalidate_folio,
 	.releasepage		= ext4_releasepage,
 	.direct_IO		= noop_direct_IO,
 	.is_partially_uptodate  = block_is_partially_uptodate,
@@ -5204,13 +5203,12 @@ int ext4_write_inode(struct inode *inode, struct writeback_control *wbc)
 }
 
 /*
- * In data=journal mode ext4_journalled_invalidatepage() may fail to invalidate
- * buffers that are attached to a page stradding i_size and are undergoing
+ * In data=journal mode ext4_journalled_invalidate_folio() may fail to invalidate
+ * buffers that are attached to a folio straddling i_size and are undergoing
  * commit. In that case we have to wait for commit to finish and try again.
  */
 static void ext4_wait_for_tail_page_commit(struct inode *inode)
 {
-	struct page *page;
 	unsigned offset;
 	journal_t *journal = EXT4_SB(inode->i_sb)->s_journal;
 	tid_t commit_tid = 0;
@@ -5218,25 +5216,25 @@ static void ext4_wait_for_tail_page_commit(struct inode *inode)
 
 	offset = inode->i_size & (PAGE_SIZE - 1);
 	/*
-	 * If the page is fully truncated, we don't need to wait for any commit
-	 * (and we even should not as __ext4_journalled_invalidatepage() may
-	 * strip all buffers from the page but keep the page dirty which can then
-	 * confuse e.g. concurrent ext4_writepage() seeing dirty page without
+	 * If the folio is fully truncated, we don't need to wait for any commit
+	 * (and we even should not as __ext4_journalled_invalidate_folio() may
+	 * strip all buffers from the folio but keep the folio dirty which can then
+	 * confuse e.g. concurrent ext4_writepage() seeing dirty folio without
 	 * buffers). Also we don't need to wait for any commit if all buffers in
-	 * the page remain valid. This is most beneficial for the common case of
+	 * the folio remain valid. This is most beneficial for the common case of
 	 * blocksize == PAGESIZE.
 	 */
 	if (!offset || offset > (PAGE_SIZE - i_blocksize(inode)))
 		return;
 	while (1) {
-		page = find_lock_page(inode->i_mapping,
+		struct folio *folio = filemap_lock_folio(inode->i_mapping,
 				      inode->i_size >> PAGE_SHIFT);
-		if (!page)
+		if (!folio)
 			return;
-		ret = __ext4_journalled_invalidatepage(page, offset,
-						PAGE_SIZE - offset);
-		unlock_page(page);
-		put_page(page);
+		ret = __ext4_journalled_invalidate_folio(folio, offset,
+						folio_size(folio) - offset);
+		folio_unlock(folio);
+		folio_put(folio);
 		if (ret != -EBUSY)
 			return;
 		commit_tid = 0;

fs/jbd2/journal.c

@@ -86,7 +86,7 @@ EXPORT_SYMBOL(jbd2_journal_start_commit);
 EXPORT_SYMBOL(jbd2_journal_force_commit_nested);
 EXPORT_SYMBOL(jbd2_journal_wipe);
 EXPORT_SYMBOL(jbd2_journal_blocks_per_page);
-EXPORT_SYMBOL(jbd2_journal_invalidatepage);
+EXPORT_SYMBOL(jbd2_journal_invalidate_folio);
 EXPORT_SYMBOL(jbd2_journal_try_to_free_buffers);
 EXPORT_SYMBOL(jbd2_journal_force_commit);
 EXPORT_SYMBOL(jbd2_journal_inode_ranged_write);

fs/jbd2/transaction.c

@@ -2219,14 +2219,14 @@ static int __dispose_buffer(struct journal_head *jh, transaction_t *transaction)
 }
 
 /*
- * jbd2_journal_invalidatepage
+ * jbd2_journal_invalidate_folio
  *
  * This code is tricky.  It has a number of cases to deal with.
  *
  * There are two invariants which this code relies on:
  *
- * i_size must be updated on disk before we start calling invalidatepage on the
- * data.
+ * i_size must be updated on disk before we start calling invalidate_folio
+ * on the data.
  *
  *  This is done in ext3 by defining an ext3_setattr method which
  *  updates i_size before truncate gets going.  By maintaining this
@@ -2428,9 +2428,9 @@ static int journal_unmap_buffer(journal_t *journal, struct buffer_head *bh,
 }
 
 /**
- * jbd2_journal_invalidatepage()
+ * jbd2_journal_invalidate_folio()
  * @journal: journal to use for flush...
- * @page:    page to flush
+ * @folio:    folio to flush
  * @offset:  start of the range to invalidate
  * @length:  length of the range to invalidate
  *
@@ -2439,30 +2439,29 @@ static int journal_unmap_buffer(journal_t *journal, struct buffer_head *bh,
  * the page is straddling i_size. Caller then has to wait for current commit
  * and try again.
  */
-int jbd2_journal_invalidatepage(journal_t *journal,
-				struct page *page,
-				unsigned int offset,
-				unsigned int length)
+int jbd2_journal_invalidate_folio(journal_t *journal, struct folio *folio,
+				size_t offset, size_t length)
 {
 	struct buffer_head *head, *bh, *next;
 	unsigned int stop = offset + length;
 	unsigned int curr_off = 0;
-	int partial_page = (offset || length < PAGE_SIZE);
+	int partial_page = (offset || length < folio_size(folio));
 	int may_free = 1;
 	int ret = 0;
 
-	if (!PageLocked(page))
+	if (!folio_test_locked(folio))
 		BUG();
-	if (!page_has_buffers(page))
+	head = folio_buffers(folio);
+	if (!head)
 		return 0;
 
-	BUG_ON(stop > PAGE_SIZE || stop < length);
+	BUG_ON(stop > folio_size(folio) || stop < length);
 
 	/* We will potentially be playing with lists other than just the
 	 * data lists (especially for journaled data mode), so be
 	 * cautious in our locking. */
 
-	head = bh = page_buffers(page);
+	bh = head;
 	do {
 		unsigned int next_off = curr_off + bh->b_size;
 		next = bh->b_this_page;
@@ -2485,8 +2484,8 @@ int jbd2_journal_invalidatepage(journal_t *journal,
 	} while (bh != head);
 
 	if (!partial_page) {
-		if (may_free && try_to_free_buffers(page))
-			J_ASSERT(!page_has_buffers(page));
+		if (may_free && try_to_free_buffers(&folio->page))
+			J_ASSERT(!folio_buffers(folio));
 	}
 	return 0;
 }

include/linux/jbd2.h

@@ -1530,8 +1530,8 @@ void		 jbd2_journal_set_triggers(struct buffer_head *,
 					   struct jbd2_buffer_trigger_type *type);
 extern int	 jbd2_journal_dirty_metadata (handle_t *, struct buffer_head *);
 extern int	 jbd2_journal_forget (handle_t *, struct buffer_head *);
-extern int	 jbd2_journal_invalidatepage(journal_t *,
-				struct page *, unsigned int, unsigned int);
+int jbd2_journal_invalidate_folio(journal_t *, struct folio *,
+					size_t offset, size_t length);
 extern int	 jbd2_journal_try_to_free_buffers(journal_t *journal, struct page *page);
 extern int	 jbd2_journal_stop(handle_t *);
 extern int	 jbd2_journal_flush(journal_t *journal, unsigned int flags);

include/linux/pagemap.h

@@ -422,6 +422,24 @@ static inline struct folio *filemap_get_folio(struct address_space *mapping,
 	return __filemap_get_folio(mapping, index, 0, 0);
 }
 
+/**
+ * filemap_lock_folio - Find and lock a folio.
+ * @mapping: The address_space to search.
+ * @index: The page index.
+ *
+ * Looks up the page cache entry at @mapping & @index.  If a folio is
+ * present, it is returned locked with an increased refcount.
+ *
+ * Context: May sleep.
+ * Return: A folio or %NULL if there is no folio in the cache for this
+ * index.  Will not return a shadow, swap or DAX entry.
+ */
+static inline struct folio *filemap_lock_folio(struct address_space *mapping,
+					pgoff_t index)
+{
+	return __filemap_get_folio(mapping, index, FGP_LOCK, 0);
+}
+
 /**
  * find_get_page - find and get a page reference
  * @mapping: the address_space to search

include/trace/events/ext4.h

@@ -597,44 +597,44 @@ DEFINE_EVENT(ext4__page_op, ext4_releasepage,
 	TP_ARGS(page)
 );
 
-DECLARE_EVENT_CLASS(ext4_invalidatepage_op,
-	TP_PROTO(struct page *page, unsigned int offset, unsigned int length),
+DECLARE_EVENT_CLASS(ext4_invalidate_folio_op,
+	TP_PROTO(struct folio *folio, size_t offset, size_t length),
 
-	TP_ARGS(page, offset, length),
+	TP_ARGS(folio, offset, length),
 
 	TP_STRUCT__entry(
 		__field(	dev_t,	dev			)
 		__field(	ino_t,	ino			)
 		__field(	pgoff_t, index			)
-		__field(	unsigned int, offset		)
-		__field(	unsigned int, length		)
+		__field(	size_t, offset			)
+		__field(	size_t, length			)
 	),
 
 	TP_fast_assign(
-		__entry->dev	= page->mapping->host->i_sb->s_dev;
-		__entry->ino	= page->mapping->host->i_ino;
-		__entry->index	= page->index;
+		__entry->dev	= folio->mapping->host->i_sb->s_dev;
+		__entry->ino	= folio->mapping->host->i_ino;
+		__entry->index	= folio->index;
 		__entry->offset	= offset;
 		__entry->length	= length;
 	),
 
-	TP_printk("dev %d,%d ino %lu page_index %lu offset %u length %u",
+	TP_printk("dev %d,%d ino %lu folio_index %lu offset %zu length %zu",
 		  MAJOR(__entry->dev), MINOR(__entry->dev),
 		  (unsigned long) __entry->ino,
 		  (unsigned long) __entry->index,
 		  __entry->offset, __entry->length)
 );
 
-DEFINE_EVENT(ext4_invalidatepage_op, ext4_invalidatepage,
-	TP_PROTO(struct page *page, unsigned int offset, unsigned int length),
+DEFINE_EVENT(ext4_invalidate_folio_op, ext4_invalidate_folio,
+	TP_PROTO(struct folio *folio, size_t offset, size_t length),
 
-	TP_ARGS(page, offset, length)
+	TP_ARGS(folio, offset, length)
 );
 
-DEFINE_EVENT(ext4_invalidatepage_op, ext4_journalled_invalidatepage,
-	TP_PROTO(struct page *page, unsigned int offset, unsigned int length),
+DEFINE_EVENT(ext4_invalidate_folio_op, ext4_journalled_invalidate_folio,
+	TP_PROTO(struct folio *folio, size_t offset, size_t length),
 
-	TP_ARGS(page, offset, length)
+	TP_ARGS(folio, offset, length)
 );
 
 TRACE_EVENT(ext4_discard_blocks,