From mboxrd@z Thu Jan 1 00:00:00 1970 From: Kent Overstreet Subject: [PATCH 09/22] block: Convert bio_copy_data() to bvec_iter Date: Wed, 7 Aug 2013 14:54:18 -0700 Message-ID: <1375912471-5106-10-git-send-email-kmo@daterainc.com> References: <1375912471-5106-1-git-send-email-kmo@daterainc.com> Return-path: In-Reply-To: <1375912471-5106-1-git-send-email-kmo@daterainc.com> Sender: linux-kernel-owner@vger.kernel.org To: axboe@kernel.dk Cc: neilb@suse.de, linux-kernel@vger.kernel.org, linux-fsdevel@vger.kernel.org, dm-devel@redhat.com, linux-raid@vger.kernel.org, Kent Overstreet List-Id: linux-raid.ids Our fancy new bvec iterator makes code like this much easier to write. Signed-off-by: Kent Overstreet Cc: Jens Axboe --- fs/bio.c | 60 +++++++++++++++++++++++++----------------------------------- 1 file changed, 25 insertions(+), 35 deletions(-) diff --git a/fs/bio.c b/fs/bio.c index 1c10ccc..eab8487 100644 --- a/fs/bio.c +++ b/fs/bio.c @@ -852,58 +852,48 @@ EXPORT_SYMBOL(bio_alloc_pages); */ void bio_copy_data(struct bio *dst, struct bio *src) { - struct bio_vec *src_bv, *dst_bv; - unsigned src_offset, dst_offset, bytes; + struct bvec_iter src_iter, dst_iter; + struct bio_vec src_bv, dst_bv; void *src_p, *dst_p; + unsigned bytes; - src_bv = __bio_iovec(src); - dst_bv = __bio_iovec(dst); - - src_offset = src_bv->bv_offset; - dst_offset = dst_bv->bv_offset; + src_iter = src->bi_iter; + dst_iter = dst->bi_iter; while (1) { - if (src_offset == src_bv->bv_offset + src_bv->bv_len) { - src_bv++; - if (src_bv == bio_iovec_idx(src, src->bi_vcnt)) { - src = src->bi_next; - if (!src) - break; - - src_bv = __bio_iovec(src); - } + if (!src_iter.bi_size) { + src = src->bi_next; + if (!src) + break; - src_offset = src_bv->bv_offset; + src_iter = src->bi_iter; } - if (dst_offset == dst_bv->bv_offset + dst_bv->bv_len) { - dst_bv++; - if (dst_bv == bio_iovec_idx(dst, dst->bi_vcnt)) { - dst = dst->bi_next; - if (!dst) - break; - - dst_bv = __bio_iovec(dst); - } + if (!dst_iter.bi_size) { + dst = dst->bi_next; + if (!dst) + break; - dst_offset = dst_bv->bv_offset; + dst_iter = dst->bi_iter; } - bytes = min(dst_bv->bv_offset + dst_bv->bv_len - dst_offset, - src_bv->bv_offset + src_bv->bv_len - src_offset); + src_bv = bio_iter_iovec(src, src_iter); + dst_bv = bio_iter_iovec(dst, dst_iter); + + bytes = min(src_bv.bv_len, dst_bv.bv_len); - src_p = kmap_atomic(src_bv->bv_page); - dst_p = kmap_atomic(dst_bv->bv_page); + src_p = kmap_atomic(src_bv.bv_page); + dst_p = kmap_atomic(dst_bv.bv_page); - memcpy(dst_p + dst_bv->bv_offset, - src_p + src_bv->bv_offset, + memcpy(dst_p + dst_bv.bv_offset, + src_p + src_bv.bv_offset, bytes); kunmap_atomic(dst_p); kunmap_atomic(src_p); - src_offset += bytes; - dst_offset += bytes; + bio_advance_iter(src, &src_iter, bytes); + bio_advance_iter(dst, &dst_iter, bytes); } } EXPORT_SYMBOL(bio_copy_data); -- 1.8.4.rc1