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dax: check for QUEUE_FLAG_DAX in bdev_dax_supported()

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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 <[email protected]>
Suggested-by: Mike Snitzer <[email protected]>
Fixes: commit 545ed20e6d ("dm: add infrastructure for DAX support")
Cc: [email protected]
Acked-by: Dan Williams <[email protected]>
Reviewed-by: Toshi Kani <[email protected]>
Signed-off-by: Mike Snitzer <[email protected]>
This commit is contained in:
Ross Zwisler 2018-06-26 16:30:40 -06:00 • committed by Mike Snitzer
commit 15256f6cc4
1 changed files with 8 additions and 0 deletions
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8
drivers/dax/super.c
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@ -86,6 +86,7 @@ bool __bdev_dax_supported(struct block_device *bdev, int blocksize)
{
struct dax_device *dax_dev;
bool dax_enabled = false;
struct request_queue *q;
pgoff_t pgoff;
int err, id;
void *kaddr;
@ -99,6 +100,13 @@ 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",