diff options
Diffstat (limited to 'drivers/dax/super.c')
| -rw-r--r-- | drivers/dax/super.c | 13 |
1 files changed, 13 insertions, 0 deletions
diff --git a/drivers/dax/super.c b/drivers/dax/super.c index 6ed32aac8bbe..dd299e55f65d 100644 --- a/drivers/dax/super.c +++ b/drivers/dax/super.c @@ -18,6 +18,7 @@ #include <linux/cdev.h> #include <linux/hash.h> #include <linux/slab.h> +#include <linux/uio.h> #include <linux/dax.h> #include <linux/fs.h> @@ -172,6 +173,18 @@ long dax_direct_access(struct dax_device *dax_dev, pgoff_t pgoff, long nr_pages, } EXPORT_SYMBOL_GPL(dax_direct_access); +size_t dax_copy_from_iter(struct dax_device *dax_dev, pgoff_t pgoff, void *addr, + size_t bytes, struct iov_iter *i) +{ + if (!dax_alive(dax_dev)) + return 0; + + if (!dax_dev->ops->copy_from_iter) + return copy_from_iter(addr, bytes, i); + return dax_dev->ops->copy_from_iter(dax_dev, pgoff, addr, bytes, i); +} +EXPORT_SYMBOL_GPL(dax_copy_from_iter); + bool dax_alive(struct dax_device *dax_dev) { lockdep_assert_held(&dax_srcu); |