diff mbox series

[2/4] buffer: add folio_alloc_buffers() helper

Message ID 20230417123618.22094-3-p.raghav@samsung.com
State New
Headers
Series convert create_page_buffers to folio_create_buffers |

Commit Message

Pankaj Raghav April 17, 2023, 12:36 p.m. UTC 
  Folio version of alloc_page_buffers() helper. This is required to convert
create_page_buffers() to folio_create_buffers() later in the series.

alloc_page_buffers() has been modified to call folio_alloc_buffers()
which adds one call to compound_head() but folio_alloc_buffers() removes
one call to compound_head() compared to the existing alloc_page_buffers()
implementation.

Signed-off-by: Pankaj Raghav <p.raghav@samsung.com>
---
 fs/buffer.c                 | 23 +++++++++++++++--------
 include/linux/buffer_head.h |  2 ++
 2 files changed, 17 insertions(+), 8 deletions(-)

Comments

Matthew Wilcox April 17, 2023, 1:31 p.m. UTC | #1 
On Mon, Apr 17, 2023 at 02:36:16PM +0200, Pankaj Raghav wrote:
> Folio version of alloc_page_buffers() helper. This is required to convert
> create_page_buffers() to folio_create_buffers() later in the series.
> 
> alloc_page_buffers() has been modified to call folio_alloc_buffers()
> which adds one call to compound_head() but folio_alloc_buffers() removes
> one call to compound_head() compared to the existing alloc_page_buffers()
> implementation.
> 
> Signed-off-by: Pankaj Raghav <p.raghav@samsung.com>

Reviewed-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Hannes Reinecke April 17, 2023, 2:03 p.m. UTC | #2 
On 4/17/23 14:36, Pankaj Raghav wrote:
> Folio version of alloc_page_buffers() helper. This is required to convert
> create_page_buffers() to folio_create_buffers() later in the series.
> 
> alloc_page_buffers() has been modified to call folio_alloc_buffers()
> which adds one call to compound_head() but folio_alloc_buffers() removes
> one call to compound_head() compared to the existing alloc_page_buffers()
> implementation.
> 
> Signed-off-by: Pankaj Raghav <p.raghav@samsung.com>
> ---
>   fs/buffer.c                 | 23 +++++++++++++++--------
>   include/linux/buffer_head.h |  2 ++
>   2 files changed, 17 insertions(+), 8 deletions(-)
> 
Reviewed-by: Hannes Reinecke <hare@suse.de>

Cheers,

Hannes
diff mbox series

Patch

diff --git a/fs/buffer.c b/fs/buffer.c
index 7e74bd77a81b..75415170e286 100644
--- a/fs/buffer.c
+++ b/fs/buffer.c
@@ -842,7 +842,7 @@  int remove_inode_buffers(struct inode *inode)
 }
 
 /*
- * Create the appropriate buffers when given a page for data area and
+ * Create the appropriate buffers when given a folio for data area and
  * the size of each buffer.. Use the bh->b_this_page linked list to
  * follow the buffers created.  Return NULL if unable to create more
  * buffers.
@@ -850,8 +850,8 @@  int remove_inode_buffers(struct inode *inode)
  * The retry flag is used to differentiate async IO (paging, swapping)
  * which may not fail from ordinary buffer allocations.
  */
-struct buffer_head *alloc_page_buffers(struct page *page, unsigned long size,
-		bool retry)
+struct buffer_head *folio_alloc_buffers(struct folio *folio, unsigned long size,
+					bool retry)
 {
 	struct buffer_head *bh, *head;
 	gfp_t gfp = GFP_NOFS | __GFP_ACCOUNT;
@@ -861,12 +861,12 @@  struct buffer_head *alloc_page_buffers(struct page *page, unsigned long size,
 	if (retry)
 		gfp |= __GFP_NOFAIL;
 
-	/* The page lock pins the memcg */
-	memcg = page_memcg(page);
+	/* The folio lock pins the memcg */
+	memcg = folio_memcg(folio);
 	old_memcg = set_active_memcg(memcg);
 
 	head = NULL;
-	offset = PAGE_SIZE;
+	offset = folio_size(folio);
 	while ((offset -= size) >= 0) {
 		bh = alloc_buffer_head(gfp);
 		if (!bh)
@@ -878,8 +878,8 @@  struct buffer_head *alloc_page_buffers(struct page *page, unsigned long size,
 
 		bh->b_size = size;
 
-		/* Link the buffer to its page */
-		set_bh_page(bh, page, offset);
+		/* Link the buffer to its folio */
+		folio_set_bh(bh, folio, offset);
 	}
 out:
 	set_active_memcg(old_memcg);
@@ -898,6 +898,13 @@  struct buffer_head *alloc_page_buffers(struct page *page, unsigned long size,
 
 	goto out;
 }
+EXPORT_SYMBOL_GPL(folio_alloc_buffers);
+
+struct buffer_head *alloc_page_buffers(struct page *page, unsigned long size,
+				       bool retry)
+{
+	return folio_alloc_buffers(page_folio(page), size, retry);
+}
 EXPORT_SYMBOL_GPL(alloc_page_buffers);
 
 static inline void
diff --git a/include/linux/buffer_head.h b/include/linux/buffer_head.h
index 7e92d23f4782..0b14eab41bd1 100644
--- a/include/linux/buffer_head.h
+++ b/include/linux/buffer_head.h
@@ -199,6 +199,8 @@  void set_bh_page(struct buffer_head *bh,
 void folio_set_bh(struct buffer_head *bh, struct folio *folio,
 		  unsigned long offset);
 bool try_to_free_buffers(struct folio *);
+struct buffer_head *folio_alloc_buffers(struct folio *folio, unsigned long size,
+					bool retry);
 struct buffer_head *alloc_page_buffers(struct page *page, unsigned long size,
 		bool retry);
 void create_empty_buffers(struct page *, unsigned long,