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| author |   Ross Zwisler <ross.zwisler@linux.intel.com> | 2018-06-26 16:30:41 -0600 |
|---|---|---|
| committer |   Mike Snitzer <snitzer@redhat.com> | 2018-06-28 16:06:14 -0400 |
| commit | dbc626597c39b24cefce09fbd8e9dea85869a801 (patch) | |
| tree | 4f787a40331cc8bcf1fa6c40b03449a7c57dd7d8 /drivers/md/dm.c | |
| parent | dax: check for QUEUE_FLAG_DAX in bdev_dax_supported() (diff) | |
| download | linux-dev-dbc626597c39b24cefce09fbd8e9dea85869a801.tar.xz linux-dev-dbc626597c39b24cefce09fbd8e9dea85869a801.zip | |
dm: prevent DAX mounts if not supported
Currently device_supports_dax() just checks to see if the QUEUE_FLAG_DAX
flag is set on the device's request queue to decide whether or not the
device supports filesystem DAX. Really we should be using
bdev_dax_supported() like filesystems do at mount time. This performs
other tests like checking to make sure the dax_direct_access() path works.
We also explicitly clear QUEUE_FLAG_DAX on the DM device's request queue if
any of the underlying devices do not support DAX. This makes the handling
of QUEUE_FLAG_DAX consistent with the setting/clearing of most other flags
in dm_table_set_restrictions().
Now that bdev_dax_supported() explicitly checks for QUEUE_FLAG_DAX, this
will ensure that filesystems built upon DM devices will only be able to
mount with DAX if all underlying devices also support DAX.
Signed-off-by: Ross Zwisler <ross.zwisler@linux.intel.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>
Diffstat (limited to 'drivers/md/dm.c')
| -rw-r--r-- | drivers/md/dm.c | 3 |
1 files changed, 1 insertions, 2 deletions
diff --git a/drivers/md/dm.c b/drivers/md/dm.c index a3b103e8e3ce..b0dd7027848b 100644 --- a/drivers/md/dm.c +++ b/drivers/md/dm.c @@ -1056,8 +1056,7 @@ static long dm_dax_direct_access(struct dax_device *dax_dev, pgoff_t pgoff, if (len < 1) goto out; nr_pages = min(len, nr_pages); - if (ti->type->direct_access) - ret = ti->type->direct_access(ti, pgoff, nr_pages, kaddr, pfn); + ret = ti->type->direct_access(ti, pgoff, nr_pages, kaddr, pfn); out: dm_put_live_table(md, srcu_idx); |