diff mbox series

[v2,07/28] fs/buffer: Convert __block_write_begin_int() to take a folio

Message ID 20211108040551.1942823-8-willy@infradead.org (mailing list archive)
State New, archived
Headers show
Series iomap/xfs folio patches | expand

Commit Message

Matthew Wilcox Nov. 8, 2021, 4:05 a.m. UTC 
There are no plans to convert buffer_head infrastructure to use multi-page
folios, but __block_write_begin_int() is called from iomap, and it's
more convenient and less error-prone if we pass in a folio from iomap.
It also has a nice saving of almost 200 bytes of code from removing
repeated calls to compound_head().

Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
---
 fs/buffer.c            | 22 +++++++++++-----------
 fs/internal.h          |  2 +-
 fs/iomap/buffered-io.c |  7 +++++--
 3 files changed, 17 insertions(+), 14 deletions(-)

Comments

Christoph Hellwig Nov. 9, 2021, 8:42 a.m. UTC | #1 
>  		get_block_t *get_block)
>  {
> -	return __block_write_begin_int(page, pos, len, get_block, NULL);
> +	return __block_write_begin_int(page_folio(page), pos, len, get_block, NULL);

Overly long line here.

Otherwise looks good:

Reviewed-by: Christoph Hellwig <hch@lst.de>
Darrick J. Wong Nov. 17, 2021, 4:35 a.m. UTC | #2 
On Mon, Nov 08, 2021 at 04:05:30AM +0000, Matthew Wilcox (Oracle) wrote:
> There are no plans to convert buffer_head infrastructure to use multi-page
> folios, but __block_write_begin_int() is called from iomap, and it's
> more convenient and less error-prone if we pass in a folio from iomap.
> It also has a nice saving of almost 200 bytes of code from removing
> repeated calls to compound_head().
> 
> Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>

Pretty straightforward,
Reviewed-by: Darrick J. Wong <djwong@kernel.org>

--D

> ---
>  fs/buffer.c            | 22 +++++++++++-----------
>  fs/internal.h          |  2 +-
>  fs/iomap/buffered-io.c |  7 +++++--
>  3 files changed, 17 insertions(+), 14 deletions(-)
> 
> diff --git a/fs/buffer.c b/fs/buffer.c
> index 46bc589b7a03..b1d722b26fe9 100644
> --- a/fs/buffer.c
> +++ b/fs/buffer.c
> @@ -1969,34 +1969,34 @@ iomap_to_bh(struct inode *inode, sector_t block, struct buffer_head *bh,
>  	}
>  }
>  
> -int __block_write_begin_int(struct page *page, loff_t pos, unsigned len,
> +int __block_write_begin_int(struct folio *folio, loff_t pos, unsigned len,
>  		get_block_t *get_block, const struct iomap *iomap)
>  {
>  	unsigned from = pos & (PAGE_SIZE - 1);
>  	unsigned to = from + len;
> -	struct inode *inode = page->mapping->host;
> +	struct inode *inode = folio->mapping->host;
>  	unsigned block_start, block_end;
>  	sector_t block;
>  	int err = 0;
>  	unsigned blocksize, bbits;
>  	struct buffer_head *bh, *head, *wait[2], **wait_bh=wait;
>  
> -	BUG_ON(!PageLocked(page));
> +	BUG_ON(!folio_test_locked(folio));
>  	BUG_ON(from > PAGE_SIZE);
>  	BUG_ON(to > PAGE_SIZE);
>  	BUG_ON(from > to);
>  
> -	head = create_page_buffers(page, inode, 0);
> +	head = create_page_buffers(&folio->page, inode, 0);
>  	blocksize = head->b_size;
>  	bbits = block_size_bits(blocksize);
>  
> -	block = (sector_t)page->index << (PAGE_SHIFT - bbits);
> +	block = (sector_t)folio->index << (PAGE_SHIFT - bbits);
>  
>  	for(bh = head, block_start = 0; bh != head || !block_start;
>  	    block++, block_start=block_end, bh = bh->b_this_page) {
>  		block_end = block_start + blocksize;
>  		if (block_end <= from || block_start >= to) {
> -			if (PageUptodate(page)) {
> +			if (folio_test_uptodate(folio)) {
>  				if (!buffer_uptodate(bh))
>  					set_buffer_uptodate(bh);
>  			}
> @@ -2016,20 +2016,20 @@ int __block_write_begin_int(struct page *page, loff_t pos, unsigned len,
>  
>  			if (buffer_new(bh)) {
>  				clean_bdev_bh_alias(bh);
> -				if (PageUptodate(page)) {
> +				if (folio_test_uptodate(folio)) {
>  					clear_buffer_new(bh);
>  					set_buffer_uptodate(bh);
>  					mark_buffer_dirty(bh);
>  					continue;
>  				}
>  				if (block_end > to || block_start < from)
> -					zero_user_segments(page,
> +					folio_zero_segments(folio,
>  						to, block_end,
>  						block_start, from);
>  				continue;
>  			}
>  		}
> -		if (PageUptodate(page)) {
> +		if (folio_test_uptodate(folio)) {
>  			if (!buffer_uptodate(bh))
>  				set_buffer_uptodate(bh);
>  			continue; 
> @@ -2050,14 +2050,14 @@ int __block_write_begin_int(struct page *page, loff_t pos, unsigned len,
>  			err = -EIO;
>  	}
>  	if (unlikely(err))
> -		page_zero_new_buffers(page, from, to);
> +		page_zero_new_buffers(&folio->page, from, to);
>  	return err;
>  }
>  
>  int __block_write_begin(struct page *page, loff_t pos, unsigned len,
>  		get_block_t *get_block)
>  {
> -	return __block_write_begin_int(page, pos, len, get_block, NULL);
> +	return __block_write_begin_int(page_folio(page), pos, len, get_block, NULL);
>  }
>  EXPORT_SYMBOL(__block_write_begin);
>  
> diff --git a/fs/internal.h b/fs/internal.h
> index cdd83d4899bb..afc13443392b 100644
> --- a/fs/internal.h
> +++ b/fs/internal.h
> @@ -37,7 +37,7 @@ static inline int emergency_thaw_bdev(struct super_block *sb)
>  /*
>   * buffer.c
>   */
> -int __block_write_begin_int(struct page *page, loff_t pos, unsigned len,
> +int __block_write_begin_int(struct folio *folio, loff_t pos, unsigned len,
>  		get_block_t *get_block, const struct iomap *iomap);
>  
>  /*
> diff --git a/fs/iomap/buffered-io.c b/fs/iomap/buffered-io.c
> index 1753c26c8e76..4e09ea823148 100644
> --- a/fs/iomap/buffered-io.c
> +++ b/fs/iomap/buffered-io.c
> @@ -597,6 +597,7 @@ static int iomap_write_begin(const struct iomap_iter *iter, loff_t pos,
>  	const struct iomap_page_ops *page_ops = iter->iomap.page_ops;
>  	const struct iomap *srcmap = iomap_iter_srcmap(iter);
>  	struct page *page;
> +	struct folio *folio;
>  	int status = 0;
>  
>  	BUG_ON(pos + len > iter->iomap.offset + iter->iomap.length);
> @@ -618,11 +619,12 @@ static int iomap_write_begin(const struct iomap_iter *iter, loff_t pos,
>  		status = -ENOMEM;
>  		goto out_no_page;
>  	}
> +	folio = page_folio(page);
>  
>  	if (srcmap->type == IOMAP_INLINE)
>  		status = iomap_write_begin_inline(iter, page);
>  	else if (srcmap->flags & IOMAP_F_BUFFER_HEAD)
> -		status = __block_write_begin_int(page, pos, len, NULL, srcmap);
> +		status = __block_write_begin_int(folio, pos, len, NULL, srcmap);
>  	else
>  		status = __iomap_write_begin(iter, pos, len, page);
>  
> @@ -954,11 +956,12 @@ EXPORT_SYMBOL_GPL(iomap_truncate_page);
>  static loff_t iomap_page_mkwrite_iter(struct iomap_iter *iter,
>  		struct page *page)
>  {
> +	struct folio *folio = page_folio(page);
>  	loff_t length = iomap_length(iter);
>  	int ret;
>  
>  	if (iter->iomap.flags & IOMAP_F_BUFFER_HEAD) {
> -		ret = __block_write_begin_int(page, iter->pos, length, NULL,
> +		ret = __block_write_begin_int(folio, iter->pos, length, NULL,
>  					      &iter->iomap);
>  		if (ret)
>  			return ret;
> -- 
> 2.33.0
>
diff mbox series

Patch

diff --git a/fs/buffer.c b/fs/buffer.c
index 46bc589b7a03..b1d722b26fe9 100644
--- a/fs/buffer.c
+++ b/fs/buffer.c
@@ -1969,34 +1969,34 @@  iomap_to_bh(struct inode *inode, sector_t block, struct buffer_head *bh,
 	}
 }
 
-int __block_write_begin_int(struct page *page, loff_t pos, unsigned len,
+int __block_write_begin_int(struct folio *folio, loff_t pos, unsigned len,
 		get_block_t *get_block, const struct iomap *iomap)
 {
 	unsigned from = pos & (PAGE_SIZE - 1);
 	unsigned to = from + len;
-	struct inode *inode = page->mapping->host;
+	struct inode *inode = folio->mapping->host;
 	unsigned block_start, block_end;
 	sector_t block;
 	int err = 0;
 	unsigned blocksize, bbits;
 	struct buffer_head *bh, *head, *wait[2], **wait_bh=wait;
 
-	BUG_ON(!PageLocked(page));
+	BUG_ON(!folio_test_locked(folio));
 	BUG_ON(from > PAGE_SIZE);
 	BUG_ON(to > PAGE_SIZE);
 	BUG_ON(from > to);
 
-	head = create_page_buffers(page, inode, 0);
+	head = create_page_buffers(&folio->page, inode, 0);
 	blocksize = head->b_size;
 	bbits = block_size_bits(blocksize);
 
-	block = (sector_t)page->index << (PAGE_SHIFT - bbits);
+	block = (sector_t)folio->index << (PAGE_SHIFT - bbits);
 
 	for(bh = head, block_start = 0; bh != head || !block_start;
 	    block++, block_start=block_end, bh = bh->b_this_page) {
 		block_end = block_start + blocksize;
 		if (block_end <= from || block_start >= to) {
-			if (PageUptodate(page)) {
+			if (folio_test_uptodate(folio)) {
 				if (!buffer_uptodate(bh))
 					set_buffer_uptodate(bh);
 			}
@@ -2016,20 +2016,20 @@  int __block_write_begin_int(struct page *page, loff_t pos, unsigned len,
 
 			if (buffer_new(bh)) {
 				clean_bdev_bh_alias(bh);
-				if (PageUptodate(page)) {
+				if (folio_test_uptodate(folio)) {
 					clear_buffer_new(bh);
 					set_buffer_uptodate(bh);
 					mark_buffer_dirty(bh);
 					continue;
 				}
 				if (block_end > to || block_start < from)
-					zero_user_segments(page,
+					folio_zero_segments(folio,
 						to, block_end,
 						block_start, from);
 				continue;
 			}
 		}
-		if (PageUptodate(page)) {
+		if (folio_test_uptodate(folio)) {
 			if (!buffer_uptodate(bh))
 				set_buffer_uptodate(bh);
 			continue; 
@@ -2050,14 +2050,14 @@  int __block_write_begin_int(struct page *page, loff_t pos, unsigned len,
 			err = -EIO;
 	}
 	if (unlikely(err))
-		page_zero_new_buffers(page, from, to);
+		page_zero_new_buffers(&folio->page, from, to);
 	return err;
 }
 
 int __block_write_begin(struct page *page, loff_t pos, unsigned len,
 		get_block_t *get_block)
 {
-	return __block_write_begin_int(page, pos, len, get_block, NULL);
+	return __block_write_begin_int(page_folio(page), pos, len, get_block, NULL);
 }
 EXPORT_SYMBOL(__block_write_begin);
 
diff --git a/fs/internal.h b/fs/internal.h
index cdd83d4899bb..afc13443392b 100644
--- a/fs/internal.h
+++ b/fs/internal.h
@@ -37,7 +37,7 @@  static inline int emergency_thaw_bdev(struct super_block *sb)
 /*
  * buffer.c
  */
-int __block_write_begin_int(struct page *page, loff_t pos, unsigned len,
+int __block_write_begin_int(struct folio *folio, loff_t pos, unsigned len,
 		get_block_t *get_block, const struct iomap *iomap);
 
 /*
diff --git a/fs/iomap/buffered-io.c b/fs/iomap/buffered-io.c
index 1753c26c8e76..4e09ea823148 100644
--- a/fs/iomap/buffered-io.c
+++ b/fs/iomap/buffered-io.c
@@ -597,6 +597,7 @@  static int iomap_write_begin(const struct iomap_iter *iter, loff_t pos,
 	const struct iomap_page_ops *page_ops = iter->iomap.page_ops;
 	const struct iomap *srcmap = iomap_iter_srcmap(iter);
 	struct page *page;
+	struct folio *folio;
 	int status = 0;
 
 	BUG_ON(pos + len > iter->iomap.offset + iter->iomap.length);
@@ -618,11 +619,12 @@  static int iomap_write_begin(const struct iomap_iter *iter, loff_t pos,
 		status = -ENOMEM;
 		goto out_no_page;
 	}
+	folio = page_folio(page);
 
 	if (srcmap->type == IOMAP_INLINE)
 		status = iomap_write_begin_inline(iter, page);
 	else if (srcmap->flags & IOMAP_F_BUFFER_HEAD)
-		status = __block_write_begin_int(page, pos, len, NULL, srcmap);
+		status = __block_write_begin_int(folio, pos, len, NULL, srcmap);
 	else
 		status = __iomap_write_begin(iter, pos, len, page);
 
@@ -954,11 +956,12 @@  EXPORT_SYMBOL_GPL(iomap_truncate_page);
 static loff_t iomap_page_mkwrite_iter(struct iomap_iter *iter,
 		struct page *page)
 {
+	struct folio *folio = page_folio(page);
 	loff_t length = iomap_length(iter);
 	int ret;
 
 	if (iter->iomap.flags & IOMAP_F_BUFFER_HEAD) {
-		ret = __block_write_begin_int(page, iter->pos, length, NULL,
+		ret = __block_write_begin_int(folio, iter->pos, length, NULL,
 					      &iter->iomap);
 		if (ret)
 			return ret;