diff mbox

[4/6] lightnvm: pblk: free padded entries in write buffer

Message ID 1504710066-4699-5-git-send-email-javier@cnexlabs.com (mailing list archive)
State New, archived
Headers show

Commit Message

=?UTF-8?q?Javier=20Gonz=C3=A1lez?= Sept. 6, 2017, 3:01 p.m. UTC 
When a REQ_FLUSH reaches pblk, the bio cannot be directly completed.
Instead, data on the write buffer is flushed and the bio is completed on
the completion pah. This might require some sectors to be padded in
order to guarantee a successful write.

This patch fixes a memory leak on the padded pages. A consequence of
this bad free was that internal bios not containing data (only a flush)
were not being completed.

Fixes: a4bd217b4326 ("lightnvm: physical block device (pblk) target")
Signed-off-by: Javier González <javier@cnexlabs.com>
Signed-off-by: Matias Bjørling <matias@cnexlabs.com>
---
 drivers/lightnvm/pblk-core.c  |  1 -
 drivers/lightnvm/pblk-write.c | 14 +++++++++++---
 2 files changed, 11 insertions(+), 4 deletions(-)

Comments

Johannes Thumshirn Sept. 6, 2017, 3:22 p.m. UTC | #1 
On Wed, Sep 06, 2017 at 05:01:04PM +0200, Javier González wrote:
> the completion pah. This might require some sectors to be padded in
                 ^ path

Looks good otherwise,
Reviewed-by: Johannes Thumshirn <jthumshirn@suse.de>
diff mbox

Patch

diff --git a/drivers/lightnvm/pblk-core.c b/drivers/lightnvm/pblk-core.c
index acb07bbcb416..84bff271abd8 100644
--- a/drivers/lightnvm/pblk-core.c
+++ b/drivers/lightnvm/pblk-core.c
@@ -192,7 +192,6 @@  void pblk_bio_free_pages(struct pblk *pblk, struct bio *bio, int off,
 
 	WARN_ON(off + nr_pages != bio->bi_vcnt);
 
-	bio_advance(bio, off * PBLK_EXPOSED_PAGE_SIZE);
 	for (i = off; i < nr_pages + off; i++) {
 		bv = bio->bi_io_vec[i];
 		mempool_free(bv.bv_page, pblk->page_pool);
diff --git a/drivers/lightnvm/pblk-write.c b/drivers/lightnvm/pblk-write.c
index 3ad9e56d2473..6acb4a92435f 100644
--- a/drivers/lightnvm/pblk-write.c
+++ b/drivers/lightnvm/pblk-write.c
@@ -25,13 +25,20 @@  static unsigned long pblk_end_w_bio(struct pblk *pblk, struct nvm_rq *rqd,
 	unsigned long ret;
 	int i;
 
-	for (i = 0; i < c_ctx->nr_valid; i++) {
+	i = 0;
+	do {
 		struct pblk_w_ctx *w_ctx;
 
 		w_ctx = pblk_rb_w_ctx(&pblk->rwb, c_ctx->sentry + i);
 		while ((original_bio = bio_list_pop(&w_ctx->bios)))
 			bio_endio(original_bio);
-	}
+
+		i++;
+	} while (i < c_ctx->nr_valid);
+
+	if (c_ctx->nr_padded)
+		pblk_bio_free_pages(pblk, rqd->bio, c_ctx->nr_valid,
+							c_ctx->nr_padded);
 
 #ifdef CONFIG_NVM_DEBUG
 	atomic_long_add(c_ctx->nr_valid, &pblk->sync_writes);
@@ -521,7 +528,8 @@  static void pblk_free_write_rqd(struct pblk *pblk, struct nvm_rq *rqd)
 	struct bio *bio = rqd->bio;
 
 	if (c_ctx->nr_padded)
-		pblk_bio_free_pages(pblk, bio, rqd->nr_ppas, c_ctx->nr_padded);
+		pblk_bio_free_pages(pblk, bio, c_ctx->nr_valid,
+							c_ctx->nr_padded);
 }
 
 static int pblk_submit_write(struct pblk *pblk)