filemap: Convert filemap_read() to use a folio
We know the pagevec always contains folios, but use page_folio() anyway
instead of casting. Removes a few calls to legacy functions.
Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: William Kucharski <william.kucharski@oracle.com>
diff --git a/mm/filemap.c b/mm/filemap.c
index 72ea824..ea5460e 100644
--- a/mm/filemap.c
+++ b/mm/filemap.c
@@ -2668,30 +2668,26 @@ ssize_t filemap_read(struct kiocb *iocb, struct iov_iter *iter,
mark_page_accessed(pvec.pages[0]);
for (i = 0; i < pagevec_count(&pvec); i++) {
- struct page *page = pvec.pages[i];
- size_t page_size = thp_size(page);
- size_t offset = iocb->ki_pos & (page_size - 1);
+ struct folio *folio = page_folio(pvec.pages[i]);
+ size_t fsize = folio_size(folio);
+ size_t offset = iocb->ki_pos & (fsize - 1);
size_t bytes = min_t(loff_t, end_offset - iocb->ki_pos,
- page_size - offset);
+ fsize - offset);
size_t copied;
- if (end_offset < page_offset(page))
+ if (end_offset < folio_pos(folio))
break;
if (i > 0)
- mark_page_accessed(page);
+ folio_mark_accessed(folio);
/*
- * If users can be writing to this page using arbitrary
- * virtual addresses, take care about potential aliasing
- * before reading the page on the kernel side.
+ * If users can be writing to this folio using arbitrary
+ * virtual addresses, take care of potential aliasing
+ * before reading the folio on the kernel side.
*/
- if (writably_mapped) {
- int j;
+ if (writably_mapped)
+ flush_dcache_folio(folio);
- for (j = 0; j < thp_nr_pages(page); j++)
- flush_dcache_page(page + j);
- }
-
- copied = copy_page_to_iter(page, offset, bytes, iter);
+ copied = copy_folio_to_iter(folio, offset, bytes, iter);
already_read += copied;
iocb->ki_pos += copied;
