[Ocfs2-devel] remove most callers of write_one_page v4

[Ocfs2-devel] remove most callers of write_one_page v4

[Christoph Hellwig via Ocfs2-devel]

Hi all,

this series removes most users of the write_one_page API.  These helpers
internally call ->writepage which we are gradually removing from the
kernel.

Changes since v3:
 - drop all patches merged in v6.3-rc1
 - re-add the jfs patch

Changes since v2:
 - more minix error handling fixes

Changes since v1:
 - drop the btrfs changes (queue up in the btrfs tree)
 - drop the finaly move to jfs (can't be done without the btrfs patches)
 - fix the existing minix code to properly propagate errors

Diffstat:
 fs/jfs/jfs_metapage.c   |   39 ++++++++++++++++++++++++++++++++++-----
 fs/ocfs2/refcounttree.c |    9 +++++----
 fs/ufs/dir.c            |   29 +++++++++++++++++++----------
 include/linux/pagemap.h |    6 ------
 mm/page-writeback.c     |   40 ----------------------------------------
 5 files changed, 58 insertions(+), 65 deletions(-)

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[Ocfs2-devel] [PATCH 1/3] ufs: don't flush page immediately for DIRSYNC directories

[Christoph Hellwig via Ocfs2-devel]

We do not need to writeout modified directory blocks immediately when
modifying them while the page is locked. It is enough to do the flush
somewhat later which has the added benefit that inode times can be
flushed as well. It also allows us to stop depending on
write_one_page() function.

Ported from an ext2 patch by Jan Kara.

Signed-off-by: Christoph Hellwig <hch@lst.de>
---
 fs/ufs/dir.c | 29 +++++++++++++++++++----------
 1 file changed, 19 insertions(+), 10 deletions(-)

diff --git a/fs/ufs/dir.c b/fs/ufs/dir.c
index 391efaf1d52897..379d75796a5ce3 100644
--- a/fs/ufs/dir.c
+++ b/fs/ufs/dir.c
@@ -42,11 +42,10 @@ static inline int ufs_match(struct super_block *sb, int len,
 	return !memcmp(name, de->d_name, len);
 }
 
-static int ufs_commit_chunk(struct page *page, loff_t pos, unsigned len)
+static void ufs_commit_chunk(struct page *page, loff_t pos, unsigned len)
 {
 	struct address_space *mapping = page->mapping;
 	struct inode *dir = mapping->host;
-	int err = 0;
 
 	inode_inc_iversion(dir);
 	block_write_end(NULL, mapping, pos, len, len, page, NULL);
@@ -54,10 +53,16 @@ static int ufs_commit_chunk(struct page *page, loff_t pos, unsigned len)
 		i_size_write(dir, pos+len);
 		mark_inode_dirty(dir);
 	}
-	if (IS_DIRSYNC(dir))
-		err = write_one_page(page);
-	else
-		unlock_page(page);
+	unlock_page(page);
+}
+
+static int ufs_handle_dirsync(struct inode *dir)
+{
+	int err;
+
+	err = filemap_write_and_wait(dir->i_mapping);
+	if (!err)
+		err = sync_inode_metadata(dir, 1);
 	return err;
 }
 
@@ -99,11 +104,12 @@ void ufs_set_link(struct inode *dir, struct ufs_dir_entry *de,
 	de->d_ino = cpu_to_fs32(dir->i_sb, inode->i_ino);
 	ufs_set_de_type(dir->i_sb, de, inode->i_mode);
 
-	err = ufs_commit_chunk(page, pos, len);
+	ufs_commit_chunk(page, pos, len);
 	ufs_put_page(page);
 	if (update_times)
 		dir->i_mtime = dir->i_ctime = current_time(dir);
 	mark_inode_dirty(dir);
+	ufs_handle_dirsync(dir);
 }
 
 
@@ -390,10 +396,11 @@ int ufs_add_link(struct dentry *dentry, struct inode *inode)
 	de->d_ino = cpu_to_fs32(sb, inode->i_ino);
 	ufs_set_de_type(sb, de, inode->i_mode);
 
-	err = ufs_commit_chunk(page, pos, rec_len);
+	ufs_commit_chunk(page, pos, rec_len);
 	dir->i_mtime = dir->i_ctime = current_time(dir);
 
 	mark_inode_dirty(dir);
+	err = ufs_handle_dirsync(dir);
 	/* OFFSET_CACHE */
 out_put:
 	ufs_put_page(page);
@@ -531,9 +538,10 @@ int ufs_delete_entry(struct inode *inode, struct ufs_dir_entry *dir,
 	if (pde)
 		pde->d_reclen = cpu_to_fs16(sb, to - from);
 	dir->d_ino = 0;
-	err = ufs_commit_chunk(page, pos, to - from);
+	ufs_commit_chunk(page, pos, to - from);
 	inode->i_ctime = inode->i_mtime = current_time(inode);
 	mark_inode_dirty(inode);
+	err = ufs_handle_dirsync(inode);
 out:
 	ufs_put_page(page);
 	UFSD("EXIT\n");
@@ -579,7 +587,8 @@ int ufs_make_empty(struct inode * inode, struct inode *dir)
 	strcpy (de->d_name, "..");
 	kunmap(page);
 
-	err = ufs_commit_chunk(page, 0, chunk_size);
+	ufs_commit_chunk(page, 0, chunk_size);
+	err = ufs_handle_dirsync(inode);
 fail:
 	put_page(page);
 	return err;
-- 
2.39.1


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[Ocfs2-devel] [PATCH 2/3] ocfs2: don't use write_one_page in ocfs2_duplicate_clusters_by_page

[Christoph Hellwig via Ocfs2-devel]

Use filemap_write_and_wait_range to write back the range of the dirty
page instead of write_one_page in preparation of removing write_one_page
and eventually ->writepage.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Jan Kara <jack@suse.cz>
Reviewed-by: Joseph Qi <joseph.qi@linux.alibaba.com>
---
 fs/ocfs2/refcounttree.c | 9 +++++----
 1 file changed, 5 insertions(+), 4 deletions(-)

diff --git a/fs/ocfs2/refcounttree.c b/fs/ocfs2/refcounttree.c
index 5a656dc683f108..564ab48d03effa 100644
--- a/fs/ocfs2/refcounttree.c
+++ b/fs/ocfs2/refcounttree.c
@@ -2952,10 +2952,11 @@ int ocfs2_duplicate_clusters_by_page(handle_t *handle,
 		 */
 		if (PAGE_SIZE <= OCFS2_SB(sb)->s_clustersize) {
 			if (PageDirty(page)) {
-				/*
-				 * write_on_page will unlock the page on return
-				 */
-				ret = write_one_page(page);
+				unlock_page(page);
+				put_page(page);
+
+				ret = filemap_write_and_wait_range(mapping,
+						offset, map_end - 1);
 				goto retry;
 			}
 		}
-- 
2.39.1


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[Ocfs2-devel] [PATCH 3/3] mm, jfs: move write_one_page/folio_write_one to jfs

[Christoph Hellwig via Ocfs2-devel]

The last remaining user of folio_write_one through the write_one_page
wrapper is jfs, so move the functionality there and hard code the
call to metapage_writepage.

Note that the use of the pagecache by the JFS 'metapage' buffer cache
is a bit odd, and we could probably do without VM-level dirty tracking
at all, but that's a change for another time.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Acked-by: Dave Kleikamp <dave.kleikamp@oracle.com>
---
 fs/jfs/jfs_metapage.c   | 39 ++++++++++++++++++++++++++++++++++-----
 include/linux/pagemap.h |  6 ------
 mm/page-writeback.c     | 40 ----------------------------------------
 3 files changed, 34 insertions(+), 51 deletions(-)

diff --git a/fs/jfs/jfs_metapage.c b/fs/jfs/jfs_metapage.c
index 2e8461ce74de69..961569c1115901 100644
--- a/fs/jfs/jfs_metapage.c
+++ b/fs/jfs/jfs_metapage.c
@@ -691,6 +691,35 @@ void grab_metapage(struct metapage * mp)
 	unlock_page(mp->page);
 }
 
+static int metapage_write_one(struct page *page)
+{
+	struct folio *folio = page_folio(page);
+	struct address_space *mapping = folio->mapping;
+	struct writeback_control wbc = {
+		.sync_mode = WB_SYNC_ALL,
+		.nr_to_write = folio_nr_pages(folio),
+	};
+	int ret = 0;
+
+	BUG_ON(!folio_test_locked(folio));
+
+	folio_wait_writeback(folio);
+
+	if (folio_clear_dirty_for_io(folio)) {
+		folio_get(folio);
+		ret = metapage_writepage(page, &wbc);
+		if (ret == 0)
+			folio_wait_writeback(folio);
+		folio_put(folio);
+	} else {
+		folio_unlock(folio);
+	}
+
+	if (!ret)
+		ret = filemap_check_errors(mapping);
+	return ret;
+}
+
 void force_metapage(struct metapage *mp)
 {
 	struct page *page = mp->page;
@@ -700,8 +729,8 @@ void force_metapage(struct metapage *mp)
 	get_page(page);
 	lock_page(page);
 	set_page_dirty(page);
-	if (write_one_page(page))
-		jfs_error(mp->sb, "write_one_page() failed\n");
+	if (metapage_write_one(page))
+		jfs_error(mp->sb, "metapage_write_one() failed\n");
 	clear_bit(META_forcewrite, &mp->flag);
 	put_page(page);
 }
@@ -746,9 +775,9 @@ void release_metapage(struct metapage * mp)
 		set_page_dirty(page);
 		if (test_bit(META_sync, &mp->flag)) {
 			clear_bit(META_sync, &mp->flag);
-			if (write_one_page(page))
-				jfs_error(mp->sb, "write_one_page() failed\n");
-			lock_page(page); /* write_one_page unlocks the page */
+			if (metapage_write_one(page))
+				jfs_error(mp->sb, "metapage_write_one() failed\n");
+			lock_page(page);
 		}
 	} else if (mp->lsn)	/* discard_metapage doesn't remove it */
 		remove_from_logsync(mp);
diff --git a/include/linux/pagemap.h b/include/linux/pagemap.h
index 0acb8e1fb7afdc..853184a46411f4 100644
--- a/include/linux/pagemap.h
+++ b/include/linux/pagemap.h
@@ -1066,12 +1066,6 @@ static inline void folio_cancel_dirty(struct folio *folio)
 bool folio_clear_dirty_for_io(struct folio *folio);
 bool clear_page_dirty_for_io(struct page *page);
 void folio_invalidate(struct folio *folio, size_t offset, size_t length);
-int __must_check folio_write_one(struct folio *folio);
-static inline int __must_check write_one_page(struct page *page)
-{
-	return folio_write_one(page_folio(page));
-}
-
 int __set_page_dirty_nobuffers(struct page *page);
 bool noop_dirty_folio(struct address_space *mapping, struct folio *folio);
 
diff --git a/mm/page-writeback.c b/mm/page-writeback.c
index 516b1aa247e83f..db794399900734 100644
--- a/mm/page-writeback.c
+++ b/mm/page-writeback.c
@@ -2583,46 +2583,6 @@ int do_writepages(struct address_space *mapping, struct writeback_control *wbc)
 	return ret;
 }
 
-/**
- * folio_write_one - write out a single folio and wait on I/O.
- * @folio: The folio to write.
- *
- * The folio must be locked by the caller and will be unlocked upon return.
- *
- * Note that the mapping's AS_EIO/AS_ENOSPC flags will be cleared when this
- * function returns.
- *
- * Return: %0 on success, negative error code otherwise
- */
-int folio_write_one(struct folio *folio)
-{
-	struct address_space *mapping = folio->mapping;
-	int ret = 0;
-	struct writeback_control wbc = {
-		.sync_mode = WB_SYNC_ALL,
-		.nr_to_write = folio_nr_pages(folio),
-	};
-
-	BUG_ON(!folio_test_locked(folio));
-
-	folio_wait_writeback(folio);
-
-	if (folio_clear_dirty_for_io(folio)) {
-		folio_get(folio);
-		ret = mapping->a_ops->writepage(&folio->page, &wbc);
-		if (ret == 0)
-			folio_wait_writeback(folio);
-		folio_put(folio);
-	} else {
-		folio_unlock(folio);
-	}
-
-	if (!ret)
-		ret = filemap_check_errors(mapping);
-	return ret;
-}
-EXPORT_SYMBOL(folio_write_one);
-
 /*
  * For address_spaces which do not use buffers nor write back.
  */
-- 
2.39.1


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Re: [Ocfs2-devel] [PATCH 3/3] mm, jfs: move write_one_page/folio_write_one to jfs

[Dave Kleikamp via Ocfs2-devel]

On 3/7/23 8:31AM, Christoph Hellwig wrote:
> The last remaining user of folio_write_one through the write_one_page
> wrapper is jfs, so move the functionality there and hard code the
> call to metapage_writepage.
> 
> Note that the use of the pagecache by the JFS 'metapage' buffer cache
> is a bit odd, and we could probably do without VM-level dirty tracking
> at all, but that's a change for another time.
> 
> Signed-off-by: Christoph Hellwig <hch@lst.de>
> Acked-by: Dave Kleikamp <dave.kleikamp@oracle.com>

Was about to ack this and noticed I must have done it earlier. For the 
record, it looks good to me.

Shaggy

> ---
>   fs/jfs/jfs_metapage.c   | 39 ++++++++++++++++++++++++++++++++++-----
>   include/linux/pagemap.h |  6 ------
>   mm/page-writeback.c     | 40 ----------------------------------------
>   3 files changed, 34 insertions(+), 51 deletions(-)
> 
> diff --git a/fs/jfs/jfs_metapage.c b/fs/jfs/jfs_metapage.c
> index 2e8461ce74de69..961569c1115901 100644
> --- a/fs/jfs/jfs_metapage.c
> +++ b/fs/jfs/jfs_metapage.c
> @@ -691,6 +691,35 @@ void grab_metapage(struct metapage * mp)
>   	unlock_page(mp->page);
>   }
>   
> +static int metapage_write_one(struct page *page)
> +{
> +	struct folio *folio = page_folio(page);
> +	struct address_space *mapping = folio->mapping;
> +	struct writeback_control wbc = {
> +		.sync_mode = WB_SYNC_ALL,
> +		.nr_to_write = folio_nr_pages(folio),
> +	};
> +	int ret = 0;
> +
> +	BUG_ON(!folio_test_locked(folio));
> +
> +	folio_wait_writeback(folio);
> +
> +	if (folio_clear_dirty_for_io(folio)) {
> +		folio_get(folio);
> +		ret = metapage_writepage(page, &wbc);
> +		if (ret == 0)
> +			folio_wait_writeback(folio);
> +		folio_put(folio);
> +	} else {
> +		folio_unlock(folio);
> +	}
> +
> +	if (!ret)
> +		ret = filemap_check_errors(mapping);
> +	return ret;
> +}
> +
>   void force_metapage(struct metapage *mp)
>   {
>   	struct page *page = mp->page;
> @@ -700,8 +729,8 @@ void force_metapage(struct metapage *mp)
>   	get_page(page);
>   	lock_page(page);
>   	set_page_dirty(page);
> -	if (write_one_page(page))
> -		jfs_error(mp->sb, "write_one_page() failed\n");
> +	if (metapage_write_one(page))
> +		jfs_error(mp->sb, "metapage_write_one() failed\n");
>   	clear_bit(META_forcewrite, &mp->flag);
>   	put_page(page);
>   }
> @@ -746,9 +775,9 @@ void release_metapage(struct metapage * mp)
>   		set_page_dirty(page);
>   		if (test_bit(META_sync, &mp->flag)) {
>   			clear_bit(META_sync, &mp->flag);
> -			if (write_one_page(page))
> -				jfs_error(mp->sb, "write_one_page() failed\n");
> -			lock_page(page); /* write_one_page unlocks the page */
> +			if (metapage_write_one(page))
> +				jfs_error(mp->sb, "metapage_write_one() failed\n");
> +			lock_page(page);
>   		}
>   	} else if (mp->lsn)	/* discard_metapage doesn't remove it */
>   		remove_from_logsync(mp);
> diff --git a/include/linux/pagemap.h b/include/linux/pagemap.h
> index 0acb8e1fb7afdc..853184a46411f4 100644
> --- a/include/linux/pagemap.h
> +++ b/include/linux/pagemap.h
> @@ -1066,12 +1066,6 @@ static inline void folio_cancel_dirty(struct folio *folio)
>   bool folio_clear_dirty_for_io(struct folio *folio);
>   bool clear_page_dirty_for_io(struct page *page);
>   void folio_invalidate(struct folio *folio, size_t offset, size_t length);
> -int __must_check folio_write_one(struct folio *folio);
> -static inline int __must_check write_one_page(struct page *page)
> -{
> -	return folio_write_one(page_folio(page));
> -}
> -
>   int __set_page_dirty_nobuffers(struct page *page);
>   bool noop_dirty_folio(struct address_space *mapping, struct folio *folio);
>   
> diff --git a/mm/page-writeback.c b/mm/page-writeback.c
> index 516b1aa247e83f..db794399900734 100644
> --- a/mm/page-writeback.c
> +++ b/mm/page-writeback.c
> @@ -2583,46 +2583,6 @@ int do_writepages(struct address_space *mapping, struct writeback_control *wbc)
>   	return ret;
>   }
>   
> -/**
> - * folio_write_one - write out a single folio and wait on I/O.
> - * @folio: The folio to write.
> - *
> - * The folio must be locked by the caller and will be unlocked upon return.
> - *
> - * Note that the mapping's AS_EIO/AS_ENOSPC flags will be cleared when this
> - * function returns.
> - *
> - * Return: %0 on success, negative error code otherwise
> - */
> -int folio_write_one(struct folio *folio)
> -{
> -	struct address_space *mapping = folio->mapping;
> -	int ret = 0;
> -	struct writeback_control wbc = {
> -		.sync_mode = WB_SYNC_ALL,
> -		.nr_to_write = folio_nr_pages(folio),
> -	};
> -
> -	BUG_ON(!folio_test_locked(folio));
> -
> -	folio_wait_writeback(folio);
> -
> -	if (folio_clear_dirty_for_io(folio)) {
> -		folio_get(folio);
> -		ret = mapping->a_ops->writepage(&folio->page, &wbc);
> -		if (ret == 0)
> -			folio_wait_writeback(folio);
> -		folio_put(folio);
> -	} else {
> -		folio_unlock(folio);
> -	}
> -
> -	if (!ret)
> -		ret = filemap_check_errors(mapping);
> -	return ret;
> -}
> -EXPORT_SYMBOL(folio_write_one);
> -
>   /*
>    * For address_spaces which do not use buffers nor write back.
>    */

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Re: [Ocfs2-devel] [PATCH 2/3] ocfs2: don't use write_one_page in ocfs2_duplicate_clusters_by_page

[Al Viro via Ocfs2-devel]

On Tue, Mar 07, 2023 at 03:31:24PM +0100, Christoph Hellwig wrote:
> Use filemap_write_and_wait_range to write back the range of the dirty
> page instead of write_one_page in preparation of removing write_one_page
> and eventually ->writepage.

That one is in vfs.git #work.misc (sorry, missed -next last cycle).

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Re: [Ocfs2-devel] [PATCH 1/3] ufs: don't flush page immediately for DIRSYNC directories

[Al Viro via Ocfs2-devel]

On Tue, Mar 07, 2023 at 03:31:23PM +0100, Christoph Hellwig wrote:
> We do not need to writeout modified directory blocks immediately when
> modifying them while the page is locked. It is enough to do the flush
> somewhat later which has the added benefit that inode times can be
> flushed as well. It also allows us to stop depending on
> write_one_page() function.
> 
> Ported from an ext2 patch by Jan Kara.

Umm...  I'll throw it in ufs pile, I guess (tomorrow - I'll need to
sort out Fabio's patches in the area as well; IIRC, the latest
had been in late December).

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Re: [Ocfs2-devel] [PATCH 1/3] ufs: don't flush page immediately for DIRSYNC directories

[Christoph Hellwig via Ocfs2-devel]

On Fri, Mar 10, 2023 at 03:53:53AM +0000, Al Viro wrote:
> On Tue, Mar 07, 2023 at 03:31:23PM +0100, Christoph Hellwig wrote:
> > We do not need to writeout modified directory blocks immediately when
> > modifying them while the page is locked. It is enough to do the flush
> > somewhat later which has the added benefit that inode times can be
> > flushed as well. It also allows us to stop depending on
> > write_one_page() function.
> > 
> > Ported from an ext2 patch by Jan Kara.
> 
> Umm...  I'll throw it in ufs pile, I guess (tomorrow - I'll need to
> sort out Fabio's patches in the area as well; IIRC, the latest
> had been in late December).

Well, the three patches really should go together, otherwise we miss
yet another merge window.

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Re: [Ocfs2-devel] [PATCH 1/3] ufs: don't flush page immediately for DIRSYNC directories

[Al Viro via Ocfs2-devel]

On Fri, Mar 10, 2023 at 07:37:56AM +0100, Christoph Hellwig wrote:
> On Fri, Mar 10, 2023 at 03:53:53AM +0000, Al Viro wrote:
> > On Tue, Mar 07, 2023 at 03:31:23PM +0100, Christoph Hellwig wrote:
> > > We do not need to writeout modified directory blocks immediately when
> > > modifying them while the page is locked. It is enough to do the flush
> > > somewhat later which has the added benefit that inode times can be
> > > flushed as well. It also allows us to stop depending on
> > > write_one_page() function.
> > > 
> > > Ported from an ext2 patch by Jan Kara.
> > 
> > Umm...  I'll throw it in ufs pile, I guess (tomorrow - I'll need to
> > sort out Fabio's patches in the area as well; IIRC, the latest
> > had been in late December).
> 
> Well, the three patches really should go together, otherwise we miss
> yet another merge window.

Umm...  Do you need them in the same (never-rebased?) branch, or would
it suffice to have all of them reach mainline by 6.4-rc1?

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Re: [Ocfs2-devel] [PATCH 1/3] ufs: don't flush page immediately for DIRSYNC directories

[Christoph Hellwig via Ocfs2-devel]

On Fri, Mar 10, 2023 at 06:52:35AM +0000, Al Viro wrote:
> > > Umm...  I'll throw it in ufs pile, I guess (tomorrow - I'll need to
> > > sort out Fabio's patches in the area as well; IIRC, the latest
> > > had been in late December).
> > 
> > Well, the three patches really should go together, otherwise we miss
> > yet another merge window.
> 
> Umm...  Do you need them in the same (never-rebased?) branch, or would
> it suffice to have all of them reach mainline by 6.4-rc1?

The latter.  But patch 3 depends on 1 and 2.

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Re: [Ocfs2-devel] [PATCH 1/3] ufs: don't flush page immediately for DIRSYNC directories

[Al Viro via Ocfs2-devel]

On Fri, Mar 10, 2023 at 08:00:47AM +0100, Christoph Hellwig wrote:
> On Fri, Mar 10, 2023 at 06:52:35AM +0000, Al Viro wrote:
> > > > Umm...  I'll throw it in ufs pile, I guess (tomorrow - I'll need to
> > > > sort out Fabio's patches in the area as well; IIRC, the latest
> > > > had been in late December).
> > > 
> > > Well, the three patches really should go together, otherwise we miss
> > > yet another merge window.
> > 
> > Umm...  Do you need them in the same (never-rebased?) branch, or would
> > it suffice to have all of them reach mainline by 6.4-rc1?
> 
> The latter.  But patch 3 depends on 1 and 2.

Obviously, but that's not hard to arrange.  OK, will do tomorrow; remind me
if all three are not in vfs.git by Monday...

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