linux-kernel - [PATCH 1/2] dm: update table type check for dax

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Date:	Tue, 28 Jun 2016 13:37:15 -0600
From:	Toshi Kani <toshi.kani@....com>
To:	snitzer@...hat.com
Cc:	agk@...hat.com, dan.j.williams@...el.com,
	linux-nvdimm@...ts.01.org, dm-devel@...hat.com,
	linux-raid@...r.kernel.org, linux-kernel@...r.kernel.org,
	Toshi Kani <toshi.kani@....com>
Subject: [PATCH 1/2] dm: update table type check for dax

Allow table type DM_TYPE_BIO_BASED to extend with
DM_TYPE_DAX_BIO_BASED since DM_TYPE_DAX_BIO_BASED
supports bio-based requests.

Signed-off-by: Toshi Kani <toshi.kani@....com>
Cc: Mike Snitzer <snitzer@...hat.com>
Cc: Alasdair Kergon <agk@...hat.com>
Cc: Dan Williams <dan.j.williams@...el.com>
---
 drivers/md/dm-ioctl.c |   11 ++++++++++-
 1 file changed, 10 insertions(+), 1 deletion(-)

diff --git a/drivers/md/dm-ioctl.c b/drivers/md/dm-ioctl.c
index b59e3459..0f32791 100644
--- a/drivers/md/dm-ioctl.c
+++ b/drivers/md/dm-ioctl.c
@@ -1267,6 +1267,15 @@ static int populate_table(struct dm_table *table,
 	return dm_table_complete(table);
 }
 
+static bool is_valid_type(unsigned cur, unsigned new)
+{
+	if (cur == new ||
+	    (cur == DM_TYPE_BIO_BASED && new == DM_TYPE_DAX_BIO_BASED))
+		return true;
+
+	return false;
+}
+
 static int table_load(struct dm_ioctl *param, size_t param_size)
 {
 	int r;
@@ -1309,7 +1318,7 @@ static int table_load(struct dm_ioctl *param, size_t param_size)
 			DMWARN("unable to set up device queue for new table.");
 			goto err_unlock_md_type;
 		}
-	} else if (dm_get_md_type(md) != dm_table_get_type(t)) {
+	} else if (!is_valid_type(dm_get_md_type(md), dm_table_get_type(t))) {
 		DMWARN("can't change device type after initial table load.");
 		r = -EINVAL;
 		goto err_unlock_md_type;