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Message-Id: <20200304165845.3081-2-vgoyal@redhat.com>
Date: Wed, 4 Mar 2020 11:58:26 -0500
From: Vivek Goyal <vgoyal@...hat.com>
To: linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
linux-nvdimm@...ts.01.org, virtio-fs@...hat.com, miklos@...redi.hu
Cc: vgoyal@...hat.com, stefanha@...hat.com, dgilbert@...hat.com,
mst@...hat.com
Subject: [PATCH 01/20] dax: Modify bdev_dax_pgoff() to handle NULL bdev
virtiofs does not have a block device. Modify bdev_dax_pgoff() to be
able to handle that.
If there is no bdev, that means dax offset is 0. (It can't be a partition
block device starting at an offset in dax device).
Signed-off-by: Stefan Hajnoczi <stefanha@...hat.com>
Signed-off-by: Vivek Goyal <vgoyal@...hat.com>
---
drivers/dax/super.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/drivers/dax/super.c b/drivers/dax/super.c
index 0aa4b6bc5101..c34f21f2f199 100644
--- a/drivers/dax/super.c
+++ b/drivers/dax/super.c
@@ -46,7 +46,8 @@ EXPORT_SYMBOL_GPL(dax_read_unlock);
int bdev_dax_pgoff(struct block_device *bdev, sector_t sector, size_t size,
pgoff_t *pgoff)
{
- phys_addr_t phys_off = (get_start_sect(bdev) + sector) * 512;
+ sector_t start_sect = bdev ? get_start_sect(bdev) : 0;
+ phys_addr_t phys_off = (start_sect + sector) * 512;
if (pgoff)
*pgoff = PHYS_PFN(phys_off);
--
2.20.1
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