iomap: use __set_page_dirty_nobuffers

The only difference between iomap_set_page_dirty() and
__set_page_dirty_nobuffers() is that the latter includes a debugging check
that a !Uptodate page has private data.

Link: https://lkml.kernel.org/r/20210615162342.1669332-4-willy@infradead.org
Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Cc: Dan Williams <dan.j.williams@intel.com>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Jan Kara <jack@suse.cz>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

fs/gfs2/aops.c

@@ -784,7 +784,7 @@ static const struct address_space_operations gfs2_aops = {
 	.writepages = gfs2_writepages,
 	.readpage = gfs2_readpage,
 	.readahead = gfs2_readahead,
-	.set_page_dirty = iomap_set_page_dirty,
+	.set_page_dirty = __set_page_dirty_nobuffers,
 	.releasepage = iomap_releasepage,
 	.invalidatepage = iomap_invalidatepage,
 	.bmap = gfs2_bmap,

fs/iomap/buffered-io.c

@@ -640,31 +640,6 @@ iomap_write_begin(struct inode *inode, loff_t pos, unsigned len, unsigned flags,
 	return status;
 }
 
-int
-iomap_set_page_dirty(struct page *page)
-{
-	struct address_space *mapping = page_mapping(page);
-	int newly_dirty;
-
-	if (unlikely(!mapping))
-		return !TestSetPageDirty(page);
-
-	/*
-	 * Lock out page's memcg migration to keep PageDirty
-	 * synchronized with per-memcg dirty page counters.
-	 */
-	lock_page_memcg(page);
-	newly_dirty = !TestSetPageDirty(page);
-	if (newly_dirty)
-		__set_page_dirty(page, mapping, 0);
-	unlock_page_memcg(page);
-
-	if (newly_dirty)
-		__mark_inode_dirty(mapping->host, I_DIRTY_PAGES);
-	return newly_dirty;
-}
-EXPORT_SYMBOL_GPL(iomap_set_page_dirty);
-
 static size_t __iomap_write_end(struct inode *inode, loff_t pos, size_t len,
 		size_t copied, struct page *page)
 {
@@ -684,7 +659,7 @@ static size_t __iomap_write_end(struct inode *inode, loff_t pos, size_t len,
 	if (unlikely(copied < len && !PageUptodate(page)))
 		return 0;
 	iomap_set_range_uptodate(page, offset_in_page(pos), len);
-	iomap_set_page_dirty(page);
+	__set_page_dirty_nobuffers(page);
 	return copied;
 }
 

fs/xfs/xfs_aops.c

@@ -561,7 +561,7 @@ const struct address_space_operations xfs_address_space_operations = {
 	.readahead		= xfs_vm_readahead,
 	.writepage		= xfs_vm_writepage,
 	.writepages		= xfs_vm_writepages,
-	.set_page_dirty		= iomap_set_page_dirty,
+	.set_page_dirty		= __set_page_dirty_nobuffers,
 	.releasepage		= iomap_releasepage,
 	.invalidatepage		= iomap_invalidatepage,
 	.bmap			= xfs_vm_bmap,

fs/zonefs/super.c

@@ -185,7 +185,7 @@ static const struct address_space_operations zonefs_file_aops = {
 	.readahead		= zonefs_readahead,
 	.writepage		= zonefs_writepage,
 	.writepages		= zonefs_writepages,
-	.set_page_dirty		= iomap_set_page_dirty,
+	.set_page_dirty		= __set_page_dirty_nobuffers,
 	.releasepage		= iomap_releasepage,
 	.invalidatepage		= iomap_invalidatepage,
 	.migratepage		= iomap_migrate_page,

include/linux/iomap.h

@@ -159,7 +159,6 @@ ssize_t iomap_file_buffered_write(struct kiocb *iocb, struct iov_iter *from,
 		const struct iomap_ops *ops);
 int iomap_readpage(struct page *page, const struct iomap_ops *ops);
 void iomap_readahead(struct readahead_control *, const struct iomap_ops *ops);
-int iomap_set_page_dirty(struct page *page);
 int iomap_is_partially_uptodate(struct page *page, unsigned long from,
 		unsigned long count);
 int iomap_releasepage(struct page *page, gfp_t gfp_mask);