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path: root/drivers/md/dm.c
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Diffstat (limited to 'drivers/md/dm.c')
-rw-r--r--drivers/md/dm.c20
1 files changed, 20 insertions, 0 deletions
diff --git a/drivers/md/dm.c b/drivers/md/dm.c
index 1fb1333fefec..b7c0ad01084d 100644
--- a/drivers/md/dm.c
+++ b/drivers/md/dm.c
@@ -1107,6 +1107,25 @@ static long dm_dax_direct_access(struct dax_device *dax_dev, pgoff_t pgoff,
return ret;
}
+static bool dm_dax_supported(struct dax_device *dax_dev, struct block_device *bdev,
+ int blocksize, sector_t start, sector_t len)
+{
+ struct mapped_device *md = dax_get_private(dax_dev);
+ struct dm_table *map;
+ int srcu_idx;
+ bool ret;
+
+ map = dm_get_live_table(md, &srcu_idx);
+ if (!map)
+ return false;
+
+ ret = dm_table_supports_dax(map, blocksize);
+
+ dm_put_live_table(md, srcu_idx);
+
+ return ret;
+}
+
static size_t dm_dax_copy_from_iter(struct dax_device *dax_dev, pgoff_t pgoff,
void *addr, size_t bytes, struct iov_iter *i)
{
@@ -3192,6 +3211,7 @@ static const struct block_device_operations dm_blk_dops = {
static const struct dax_operations dm_dax_ops = {
.direct_access = dm_dax_direct_access,
+ .dax_supported = dm_dax_supported,
.copy_from_iter = dm_dax_copy_from_iter,
.copy_to_iter = dm_dax_copy_to_iter,
};