| From | "Matthew Wilcox (Oracle)" <> | Subject | [PATCH v2 19/28] iomap: Convert __iomap_zero_iter to use a folio | Date | Mon, 8 Nov 2021 04:05:42 +0000 |
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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 multi-page folios.
Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org> --- 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 64e54981b651..9c61d12028ca 100644 --- a/fs/iomap/buffered-io.c +++ b/fs/iomap/buffered-io.c @@ -881,17 +881,20 @@ 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); - unsigned bytes = min_t(u64, PAGE_SIZE - offset, length); + size_t offset, bytes; - status = iomap_write_begin(iter, pos, bytes, &page); + status = iomap_write_begin(iter, pos, length, &page); if (status) return status; + folio = page_folio(page); - zero_user(page, offset, bytes); - mark_page_accessed(page); + offset = offset_in_folio(folio, pos); + bytes = min_t(u64, folio_size(folio) - offset, length); + folio_zero_range(folio, offset, bytes); + folio_mark_accessed(folio); return iomap_write_end(iter, pos, bytes, bytes, page); } -- 2.33.0
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