The quilt patch titled
Subject: buffer: make block_write_full_page() handle large folios correctly
has been removed from the -mm tree. Its filename was
buffer-make-block_write_full_page-handle-large-folios-correctly.patch
This patch was dropped because it was merged into the mm-stable branch
of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
------------------------------------------------------
From: "Matthew Wilcox (Oracle)" <willy@xxxxxxxxxxxxx>
Subject: buffer: make block_write_full_page() handle large folios correctly
Date: Mon, 12 Jun 2023 22:01:33 +0100
Keep the interface as struct page, but work entirely on the folio
internally. Removes several PAGE_SIZE assumptions and removes some
references to page->index and page->mapping.
Link: https://lkml.kernel.org/r/20230612210141.730128-7-willy@xxxxxxxxxxxxx
Signed-off-by: Matthew Wilcox (Oracle) <willy@xxxxxxxxxxxxx>
Tested-by: Bob Peterson <rpeterso@xxxxxxxxxx>
Reviewed-by: Bob Peterson <rpeterso@xxxxxxxxxx>
Cc: Andreas Gruenbacher <agruenba@xxxxxxxxxx>
Cc: Hannes Reinecke <hare@xxxxxxxx>
Cc: Luis Chamberlain <mcgrof@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
fs/buffer.c | 22 ++++++++++------------
1 file changed, 10 insertions(+), 12 deletions(-)
--- a/fs/buffer.c~buffer-make-block_write_full_page-handle-large-folios-correctly
+++ a/fs/buffer.c
@@ -2678,33 +2678,31 @@ int block_write_full_page(struct page *p
struct writeback_control *wbc)
{
struct folio *folio = page_folio(page);
- struct inode * const inode = page->mapping->host;
+ struct inode * const inode = folio->mapping->host;
loff_t i_size = i_size_read(inode);
- const pgoff_t end_index = i_size >> PAGE_SHIFT;
- unsigned offset;
- /* Is the page fully inside i_size? */
- if (page->index < end_index)
+ /* Is the folio fully inside i_size? */
+ if (folio_pos(folio) + folio_size(folio) <= i_size)
return __block_write_full_folio(inode, folio, get_block, wbc,
end_buffer_async_write);
- /* Is the page fully outside i_size? (truncate in progress) */
- offset = i_size & (PAGE_SIZE-1);
- if (page->index >= end_index+1 || !offset) {
+ /* Is the folio fully outside i_size? (truncate in progress) */
+ if (folio_pos(folio) >= i_size) {
folio_unlock(folio);
return 0; /* don't care */
}
/*
- * The page straddles i_size. It must be zeroed out on each and every
+ * The folio straddles i_size. It must be zeroed out on each and every
* writepage invocation because it may be mmapped. "A file is mapped
* in multiples of the page size. For a file that is not a multiple of
- * the page size, the remaining memory is zeroed when mapped, and
+ * the page size, the remaining memory is zeroed when mapped, and
* writes to that region are not written out to the file."
*/
- zero_user_segment(page, offset, PAGE_SIZE);
+ folio_zero_segment(folio, offset_in_folio(folio, i_size),
+ folio_size(folio));
return __block_write_full_folio(inode, folio, get_block, wbc,
- end_buffer_async_write);
+ end_buffer_async_write);
}
EXPORT_SYMBOL(block_write_full_page);
_
Patches currently in -mm which might be from willy@xxxxxxxxxxxxx are
