From 78c747a1b3a1d585f8a8066242de7a1d5bd02657 Mon Sep 17 00:00:00 2001 From: "Matthew Wilcox (Oracle)" Date: Fri, 5 Nov 2021 14:24:09 -0400 Subject: [PATCH] iomap: Convert __iomap_zero_iter to use a folio The zero iterator can work in folio-sized chunks instead of page-sized chunks. This will save a lot of page cache lookups if the file is cached in large folios. Signed-off-by: Matthew Wilcox (Oracle) Reviewed-by: Christoph Hellwig Reviewed-by: Darrick J. Wong --- fs/iomap/buffered-io.c | 13 ++++++++----- 1 file changed, 8 insertions(+), 5 deletions(-) diff --git a/fs/iomap/buffered-io.c b/fs/iomap/buffered-io.c index 67fcd3b9928d..bbde6d4f27cd 100644 --- a/fs/iomap/buffered-io.c +++ b/fs/iomap/buffered-io.c @@ -890,20 +890,23 @@ EXPORT_SYMBOL_GPL(iomap_file_unshare); static s64 __iomap_zero_iter(struct iomap_iter *iter, loff_t pos, u64 length) { + struct folio *folio; struct page *page; int status; - unsigned offset = offset_in_page(pos); + size_t offset; if (length > UINT_MAX) length = UINT_MAX; status = iomap_write_begin(iter, pos, length, &page); if (status) return status; - if (length > PAGE_SIZE - offset) - length = PAGE_SIZE - offset; + folio = page_folio(page); - zero_user(page, offset, length); - mark_page_accessed(page); + offset = offset_in_folio(folio, pos); + if (length > folio_size(folio) - offset) + length = folio_size(folio) - offset; + folio_zero_range(folio, offset, length); + folio_mark_accessed(folio); return iomap_write_end(iter, pos, length, length, page); } -- 2.50.1