commit 15256f6cc4b44f2e70503758150267fd2a53c0d6 upstream.
Add an explicit check for QUEUE_FLAG_DAX to __bdev_dax_supported(). This is needed for DM configurations where the first element in the dm-linear or dm-stripe target supports DAX, but other elements do not. Without this check __bdev_dax_supported() will pass for such devices, letting a filesystem on that device mount with the DAX option.
Signed-off-by: Ross Zwisler ross.zwisler@linux.intel.com Suggested-by: Mike Snitzer snitzer@redhat.com Fixes: commit 545ed20e6df6 ("dm: add infrastructure for DAX support") Cc: stable@vger.kernel.org Acked-by: Dan Williams dan.j.williams@intel.com Reviewed-by: Toshi Kani toshi.kani@hpe.com Signed-off-by: Mike Snitzer snitzer@redhat.com --- drivers/dax/super.c | 8 ++++++++ 1 file changed, 8 insertions(+)
diff --git a/drivers/dax/super.c b/drivers/dax/super.c index 1d7bd96511f0..1d2de641cabb 100644 --- a/drivers/dax/super.c +++ b/drivers/dax/super.c @@ -85,6 +85,7 @@ EXPORT_SYMBOL_GPL(fs_dax_get_by_bdev); bool __bdev_dax_supported(struct block_device *bdev, int blocksize) { struct dax_device *dax_dev; + struct request_queue *q; pgoff_t pgoff; int err, id; void *kaddr; @@ -98,6 +99,13 @@ bool __bdev_dax_supported(struct block_device *bdev, int blocksize) return false; }
+ q = bdev_get_queue(bdev); + if (!q || !blk_queue_dax(q)) { + pr_debug("%s: error: request queue doesn't support dax\n", + bdevname(bdev, buf)); + return false; + } + err = bdev_dax_pgoff(bdev, 0, PAGE_SIZE, &pgoff); if (err) { pr_debug("%s: error: unaligned partition for dax\n",