linux-kernel - [PATCH 3/6] iomap: Use __set_page_dirty

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Message-Id: <20210615162342.1669332-4-willy@infradead.org>
Date:   Tue, 15 Jun 2021 17:23:39 +0100
From:   "Matthew Wilcox (Oracle)" <willy@...radead.org>
To:     Christoph Hellwig <hch@....de>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Jan Kara <jack@...e.cz>, Al Viro <viro@...iv.linux.org.uk>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        linux-mm@...ck.org, linux-fsdevel@...r.kernel.org,
        linux-kernel@...r.kernel.org
Cc:     "Matthew Wilcox (Oracle)" <willy@...radead.org>
Subject: [PATCH 3/6] 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.

Signed-off-by: Matthew Wilcox (Oracle) <willy@...radead.org>
---
 fs/gfs2/aops.c         |  2 +-
 fs/iomap/buffered-io.c | 27 +--------------------------
 fs/xfs/xfs_aops.c      |  2 +-
 fs/zonefs/super.c      |  2 +-
 include/linux/iomap.h  |  1 -
 5 files changed, 4 insertions(+), 30 deletions(-)

diff --git a/fs/gfs2/aops.c b/fs/gfs2/aops.c
index 50dd1771d00c..746b78c3a91d 100644
--- a/fs/gfs2/aops.c
+++ b/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,
diff --git a/fs/iomap/buffered-io.c b/fs/iomap/buffered-io.c
index 2bf4778f2098..41da4f14c00b 100644
--- a/fs/iomap/buffered-io.c
+++ b/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;
 }
 
diff --git a/fs/xfs/xfs_aops.c b/fs/xfs/xfs_aops.c
index 826caa6b4a5a..a335d79dcff8 100644
--- a/fs/xfs/xfs_aops.c
+++ b/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,
diff --git a/fs/zonefs/super.c b/fs/zonefs/super.c
index cd145d318b17..3aacf016c7c2 100644
--- a/fs/zonefs/super.c
+++ b/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,
diff --git a/include/linux/iomap.h b/include/linux/iomap.h
index c87d0cb0de6d..479c1da3e221 100644
--- a/include/linux/iomap.h
+++ b/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);
-- 
2.30.2