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dm snapshot: don't define direct_access if we don't support it

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Don't define a direct_access function that fails, dm_dax_direct_access
already fails with -EIO if the pointer is zero;

Signed-off-by: Mikulas Patocka <mpatocka@redhat.com>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
This commit is contained in:
Mikulas Patocka 2019-02-27 12:02:05 -05:00 committed by Mike Snitzer
parent de7180ff90
commit c439ca69d5
1 changed files with 0 additions and 8 deletions
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8
drivers/md/dm-snap.c
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@ -2338,13 +2338,6 @@ static int origin_map(struct dm_target *ti, struct bio *bio)
return do_origin(o->dev, bio); return do_origin(o->dev, bio);
} }
static long origin_dax_direct_access(struct dm_target *ti, pgoff_t pgoff,
long nr_pages, void **kaddr, pfn_t *pfn)
{
DMWARN("device does not support dax.");
return -EIO;
}
/* /*
* Set the target "max_io_len" field to the minimum of all the snapshots' * Set the target "max_io_len" field to the minimum of all the snapshots'
* chunk sizes. * chunk sizes.
@ -2404,7 +2397,6 @@ static struct target_type origin_target = {
.postsuspend = origin_postsuspend, .postsuspend = origin_postsuspend,
.status = origin_status, .status = origin_status,
.iterate_devices = origin_iterate_devices, .iterate_devices = origin_iterate_devices,
.direct_access = origin_dax_direct_access,
}; };
static struct target_type snapshot_target = { static struct target_type snapshot_target = {