diff options
| author | Ross Zwisler <ross.zwisler@linux.intel.com> | 2018-06-26 16:30:41 -0600 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2018-07-11 16:29:23 +0200 |
| commit | 74ec37d03a12b001120c81fecfcb878e5e9d4382 (patch) | |
| tree | 13a962949ed77c3d5cf5959884a3a6f6c741a361 | |
| parent | 0605fa6daa6642c276ef037b3246595e4de53491 (diff) | |
| download | linux-stable-74ec37d03a12b001120c81fecfcb878e5e9d4382.tar.gz linux-stable-74ec37d03a12b001120c81fecfcb878e5e9d4382.tar.bz2 linux-stable-74ec37d03a12b001120c81fecfcb878e5e9d4382.zip | |
dm: prevent DAX mounts if not supported
commit dbc626597c39b24cefce09fbd8e9dea85869a801 upstream.
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>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| -rw-r--r-- | drivers/md/dm-table.c | 7 | ||||
| -rw-r--r-- | drivers/md/dm.c | 3 |
2 files changed, 5 insertions, 5 deletions
diff --git a/drivers/md/dm-table.c b/drivers/md/dm-table.c index 94849435c487..f9cd81375f28 100644 --- a/drivers/md/dm-table.c +++ b/drivers/md/dm-table.c @@ -883,9 +883,7 @@ EXPORT_SYMBOL_GPL(dm_table_set_type); static int device_supports_dax(struct dm_target *ti, struct dm_dev *dev, sector_t start, sector_t len, void *data) { - struct request_queue *q = bdev_get_queue(dev->bdev); - - return q && blk_queue_dax(q); + return bdev_dax_supported(dev->bdev, PAGE_SIZE); } static bool dm_table_supports_dax(struct dm_table *t) @@ -1815,6 +1813,9 @@ void dm_table_set_restrictions(struct dm_table *t, struct request_queue *q, if (dm_table_supports_dax(t)) queue_flag_set_unlocked(QUEUE_FLAG_DAX, q); + else + queue_flag_clear_unlocked(QUEUE_FLAG_DAX, q); + if (dm_table_supports_dax_write_cache(t)) dax_write_cache(t->md->dax_dev, true); diff --git a/drivers/md/dm.c b/drivers/md/dm.c index b721f0a16711..24ec6e039448 100644 --- a/drivers/md/dm.c +++ b/drivers/md/dm.c @@ -961,8 +961,7 @@ 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); |