From 010bfbc9342468b419247bae250e72a81e5828d1 Mon Sep 17 00:00:00 2001 From: Heiner Litz Date: Fri, 21 Jun 2019 11:11:59 +0200 Subject: [PATCH] lightnvm: pblk: fix freeing of merged pages MIME-Version: 1.0 Content-Type: text/plain; charset=utf8 Content-Transfer-Encoding: 8bit [ Upstream commit 510fd8ea98fcb586c01aef93d87c060a159ac30a ] bio_add_pc_page() may merge pages when a bio is padded due to a flush. Fix iteration over the bio to free the correct pages in case of a merge. Signed-off-by: Heiner Litz Reviewed-by: Javier González Signed-off-by: Matias Bjørling Signed-off-by: Jens Axboe Signed-off-by: Sasha Levin --- drivers/lightnvm/pblk-core.c | 18 ++++++++++-------- 1 file changed, 10 insertions(+), 8 deletions(-) diff --git a/drivers/lightnvm/pblk-core.c b/drivers/lightnvm/pblk-core.c index 95be6e3..80710c6 100644 --- a/drivers/lightnvm/pblk-core.c +++ b/drivers/lightnvm/pblk-core.c @@ -288,14 +288,16 @@ void pblk_free_rqd(struct pblk *pblk, struct nvm_rq *rqd, int type) void pblk_bio_free_pages(struct pblk *pblk, struct bio *bio, int off, int nr_pages) { - struct bio_vec bv; - int i; - - WARN_ON(off + nr_pages != bio->bi_vcnt); - - for (i = off; i < nr_pages + off; i++) { - bv = bio->bi_io_vec[i]; - mempool_free(bv.bv_page, &pblk->page_bio_pool); + struct bio_vec *bv; + struct page *page; + int i, e, nbv = 0; + + for (i = 0; i < bio->bi_vcnt; i++) { + bv = &bio->bi_io_vec[i]; + page = bv->bv_page; + for (e = 0; e < bv->bv_len; e += PBLK_EXPOSED_PAGE_SIZE, nbv++) + if (nbv >= off) + mempool_free(page++, &pblk->page_bio_pool); } } -- 2.7.4