Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755051Ab2JOUMS (ORCPT ); Mon, 15 Oct 2012 16:12:18 -0400 Received: from mail-da0-f46.google.com ([209.85.210.46]:47102 "EHLO mail-da0-f46.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S932079Ab2JOUK5 (ORCPT ); Mon, 15 Oct 2012 16:10:57 -0400 From: Kent Overstreet To: linux-bcache@vger.kernel.org, linux-kernel@vger.kernel.org, dm-devel@redhat.com Cc: Kent Overstreet , tj@kernel.org, axboe@kernel.dk, neilb@suse.de Subject: [PATCH v2 22/26] block: Add bio_alloc_pages() Date: Mon, 15 Oct 2012 13:09:25 -0700 Message-Id: <1350331769-14856-52-git-send-email-koverstreet@google.com> X-Mailer: git-send-email 1.7.12 In-Reply-To: <1350331769-14856-1-git-send-email-koverstreet@google.com> References: <1350331769-14856-1-git-send-email-koverstreet@google.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1953 Lines: 68 More utility code to replace stuff that's getting open coded. Signed-off-by: Kent Overstreet CC: Jens Axboe --- fs/bio.c | 28 ++++++++++++++++++++++++++++ include/linux/bio.h | 1 + 2 files changed, 29 insertions(+) diff --git a/fs/bio.c b/fs/bio.c index d88ad77..65e6eac 100644 --- a/fs/bio.c +++ b/fs/bio.c @@ -828,6 +828,34 @@ void bio_advance(struct bio *bio, unsigned bytes) EXPORT_SYMBOL(bio_advance); /** + * bio_alloc_pages - allocates a single page for each bvec in a bio + * @bio: bio to allocate pages for + * @gfp_mask: flags for allocation + * + * Allocates pages up to @bio->bi_vcnt. + * + * Returns 0 on success, -ENOMEM on failure. On failure, any allocated pages are + * freed. + */ +int bio_alloc_pages(struct bio *bio, gfp_t gfp_mask) +{ + int i; + struct bio_vec *bv; + + bio_for_each_segment_all(bv, bio, i) { + bv->bv_page = alloc_page(gfp_mask); + if (!bv->bv_page) { + while (bv-- != bio->bi_io_vec) + __free_page(bv->bv_page); + return -ENOMEM; + } + } + + return 0; +} +EXPORT_SYMBOL(bio_alloc_pages); + +/** * bio_copy_data - copy contents of data buffers from one chain of bios to * another * @src: source bio list diff --git a/include/linux/bio.h b/include/linux/bio.h index b433ff8..bd45154 100644 --- a/include/linux/bio.h +++ b/include/linux/bio.h @@ -289,6 +289,7 @@ static inline void bio_flush_dcache_pages(struct bio *bi) #endif extern void bio_copy_data(struct bio *dst, struct bio *src); +extern int bio_alloc_pages(struct bio *bio, gfp_t gfp); extern struct bio *bio_copy_user(struct request_queue *, struct rq_map_data *, unsigned long, unsigned int, int, gfp_t); -- 1.7.12 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/