Get a folio from the page cache instead of a page, then use the
folio API throughout. Removes a few calls to compound_head()
and may be needed to support block size > PAGE_SIZE.
Signed-off-by: Matthew Wilcox (Oracle) <willy@xxxxxxxxxxxxx>
---
fs/buffer.c | 34 +++++++++++++++-------------------
1 file changed, 15 insertions(+), 19 deletions(-)
diff --git a/fs/buffer.c b/fs/buffer.c
index 5f758bab5bcb..c4fc4b3b8aab 100644
--- a/fs/buffer.c
+++ b/fs/buffer.c
@@ -976,7 +976,7 @@ grow_dev_page(struct block_device *bdev, sector_t block,
pgoff_t index, int size, int sizebits, gfp_t gfp)
{
struct inode *inode = bdev->bd_inode;
- struct page *page;
+ struct folio *folio;
struct buffer_head *bh;
sector_t end_block;
int ret = 0;
@@ -992,42 +992,38 @@ grow_dev_page(struct block_device *bdev, sector_t block,
*/
gfp_mask |= __GFP_NOFAIL;
- page = find_or_create_page(inode->i_mapping, index, gfp_mask);
-
- BUG_ON(!PageLocked(page));
+ folio = __filemap_get_folio(inode->i_mapping, index,
+ FGP_LOCK | FGP_ACCESSED | FGP_CREAT, gfp_mask);
- if (page_has_buffers(page)) {
- bh = page_buffers(page);
+ bh = folio_buffers(folio);
+ if (bh) {
if (bh->b_size == size) {
- end_block = init_page_buffers(page, bdev,
+ end_block = init_page_buffers(&folio->page, bdev,
(sector_t)index << sizebits,
size);
goto done;
}
- if (!try_to_free_buffers(page_folio(page)))
+ if (!try_to_free_buffers(folio))
goto failed;
}
- /*
- * Allocate some buffers for this page
- */
- bh = alloc_page_buffers(page, size, true);
+ bh = folio_alloc_buffers(folio, size, true);
/*
- * Link the page to the buffers and initialise them. Take the
+ * Link the folio to the buffers and initialise them. Take the
* lock to be atomic wrt __find_get_block(), which does not
- * run under the page lock.
+ * run under the folio lock.
*/
spin_lock(&inode->i_mapping->private_lock);
- link_dev_buffers(page, bh);
- end_block = init_page_buffers(page, bdev, (sector_t)index << sizebits,
- size);
+ link_dev_buffers(&folio->page, bh);
+ end_block = init_page_buffers(&folio->page, bdev,
+ (sector_t)index << sizebits, size);
spin_unlock(&inode->i_mapping->private_lock);
done:
ret = (block < end_block) ? 1 : -ENXIO;
failed:
- unlock_page(page);
- put_page(page);
+ folio_unlock(folio);
+ folio_put(folio);
return ret;
}
--
2.39.2
