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Subject[PATCH 4.17 211/220] pmem: only set QUEUE_FLAG_DAX for fsdax mode
4.17-stable review patch.  If anyone has any objections, please let me know.


From: Ross Zwisler <>

commit 4557641b4c7046625c026fb809c47ef0d43ae595 upstream.

QUEUE_FLAG_DAX is an indication that a given block device supports
filesystem DAX and should not be set for PMEM namespaces which are in "raw"
mode. These namespaces lack struct page and are prevented from
participating in filesystem DAX as of commit 569d0365f571 ("dax: require
'struct page' by default for filesystem dax").

Signed-off-by: Ross Zwisler <>
Suggested-by: Mike Snitzer <>
Fixes: 569d0365f571 ("dax: require 'struct page' by default for filesystem dax")
Acked-by: Dan Williams <>
Reviewed-by: Toshi Kani <>
Signed-off-by: Mike Snitzer <>
Signed-off-by: Greg Kroah-Hartman <>

drivers/nvdimm/pmem.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)

--- a/drivers/nvdimm/pmem.c
+++ b/drivers/nvdimm/pmem.c
@@ -387,7 +387,8 @@ static int pmem_attach_disk(struct devic
blk_queue_logical_block_size(q, pmem_sector_size(ndns));
blk_queue_max_hw_sectors(q, UINT_MAX);
blk_queue_flag_set(QUEUE_FLAG_NONROT, q);
- blk_queue_flag_set(QUEUE_FLAG_DAX, q);
+ if (pmem->pfn_flags & PFN_MAP)
+ blk_queue_flag_set(QUEUE_FLAG_DAX, q);
q->queuedata = pmem;

disk = alloc_disk_node(0, nid);

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