linux-kernel - [PATCH] lightnvm: invalidate addresses on multipage fail

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Message-Id: <1454332202-13368-1-git-send-email-javier@javigon.com>
Date:	Mon,  1 Feb 2016 14:10:02 +0100
From:	"Javier González" <jg@...htnvm.io>
To:	mb@...htnvm.io
Cc:	linux-kernel@...r.kernel.org, linux-block@...r.kernel.org,
	Javier González <javier@...xlabs.com>
Subject: [PATCH] lightnvm: invalidate addresses on multipage fail

If a page mapping fails when mapping several pages in a single write bio
request, make sure that already mapped pages are invalidated. Since
other legit mappings coming from a different bio request might have
occurred, rolling back the failed bio is a difficult, unnecessary
overhead; in part because when a mapping fails something bad has
happened already. Still, invalidating pages in the failed bio will help
GC.

Signed-off-by: Javier González <javier@...xlabs.com>
---
 drivers/lightnvm/rrpc.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/lightnvm/rrpc.c b/drivers/lightnvm/rrpc.c
index c4d0b04..29befe9 100644
--- a/drivers/lightnvm/rrpc.c
+++ b/drivers/lightnvm/rrpc.c
@@ -730,6 +730,7 @@ static int rrpc_read_ppalist_rq(struct rrpc *rrpc, struct bio *bio,
 		} else {
 			BUG_ON(is_gc);
 			rrpc_unlock_laddr(rrpc, r);
+			rrpc_invalidate_range(rrpc, laddr, i + 1);
 			nvm_dev_dma_free(rrpc->dev, rqd->ppa_list,
 							rqd->dma_ppa_list);
 			return NVM_IO_DONE;
-- 
2.1.4