linux-kernel - [PATCH 3/6] pmem: pmem_dax_direct_access() to honor the DAXDEV_F

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Date:   Wed, 20 Oct 2021 18:10:56 -0600
From:   Jane Chu <jane.chu@...cle.com>
To:     david@...morbit.com, djwong@...nel.org, dan.j.williams@...el.com,
        hch@...radead.org, vishal.l.verma@...el.com, dave.jiang@...el.com,
        agk@...hat.com, snitzer@...hat.com, dm-devel@...hat.com,
        ira.weiny@...el.com, willy@...radead.org, vgoyal@...hat.com,
        linux-fsdevel@...r.kernel.org, nvdimm@...ts.linux.dev,
        linux-kernel@...r.kernel.org, linux-xfs@...r.kernel.org
Subject: [PATCH 3/6] pmem: pmem_dax_direct_access() to honor the DAXDEV_F_RECOVERY flag

Let pmem_dax_direct_access() skip badblock checking if the caller
intends to do data recovery by providing the DAXDEV_F_RECOVERY flag.

Signed-off-by: Jane Chu <jane.chu@...cle.com>
---
 drivers/nvdimm/pmem.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/drivers/nvdimm/pmem.c b/drivers/nvdimm/pmem.c
index b0b7fd40560e..ed699416655b 100644
--- a/drivers/nvdimm/pmem.c
+++ b/drivers/nvdimm/pmem.c
@@ -260,8 +260,9 @@ __weak long __pmem_direct_access(struct pmem_device *pmem, pgoff_t pgoff,
 {
 	resource_size_t offset = PFN_PHYS(pgoff) + pmem->data_offset;
 
-	if (unlikely(is_bad_pmem(&pmem->bb, PFN_PHYS(pgoff) / 512,
-					PFN_PHYS(nr_pages))))
+	if (unlikely(!(flags & DAXDEV_F_RECOVERY) &&
+		is_bad_pmem(&pmem->bb, PFN_PHYS(pgoff) / 512,
+				PFN_PHYS(nr_pages))))
 		return -EIO;
 
 	if (kaddr)
-- 
2.18.4