From 04c8e958517867ae95dcb225d2b5cb30fee439e8 Mon Sep 17 00:00:00 2001 From: Christoph Hellwig Date: Fri, 21 Mar 2025 13:43:38 +0100 Subject: [PATCH] block: add a bio_add_virt_nofail helper Add a helper to add a directly mapped kernel virtual address to a bio so that callers don't have to convert to pages or folios. For now only the _nofail variant is provided as that is what all the obvious callers want. Signed-off-by: Christoph Hellwig --- include/linux/bio.h | 17 +++++++++++++++++ 1 file changed, 17 insertions(+) diff --git a/include/linux/bio.h b/include/linux/bio.h index cafc7c215de8..0678b67162ee 100644 --- a/include/linux/bio.h +++ b/include/linux/bio.h @@ -417,6 +417,23 @@ void __bio_add_page(struct bio *bio, struct page *page, unsigned int len, unsigned int off); void bio_add_folio_nofail(struct bio *bio, struct folio *folio, size_t len, size_t off); + +/** + * bio_add_virt_nofail - add data in the diret kernel mapping to a bio + * @bio: destination bio + * @vaddr: data to add + * @len: length of the data to add, may cross pages + * + * Add the data at @vaddr to @bio. The caller must have ensure a segment + * is available for the added data. No merging into an existing segment + * will be performed. + */ +static inline void bio_add_virt_nofail(struct bio *bio, void *vaddr, + unsigned len) +{ + __bio_add_page(bio, virt_to_page(vaddr), len, offset_in_page(vaddr)); +} + int bio_iov_iter_get_pages(struct bio *bio, struct iov_iter *iter); void bio_iov_bvec_set(struct bio *bio, const struct iov_iter *iter); void __bio_release_pages(struct bio *bio, bool mark_dirty); -- 2.49.0