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dax: remove default copy_from_iter fallback

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Require all dax-drivers to register a ->copy_from_iter() operation so
that it is clear which dax_operations are optional and which must be
implemented for filesystem-dax to operate.

Cc: Gerald Schaefer <[email protected]>
Suggested-by: Christoph Hellwig <[email protected]>
Signed-off-by: Dan Williams <[email protected]>
This commit is contained in:
Dan Williams 2017-06-27 13:06:22 -07:00
commit 5d61e43b39
5 changed files with 25 additions and 3 deletions
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8
drivers/s390/block/dcssblk.c
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@ -18,6 +18,7 @@
#include <linux/interrupt.h>
#include <linux/platform_device.h>
#include <linux/pfn_t.h>
#include <linux/uio.h>
#include <linux/dax.h>
#include <asm/extmem.h>
#include <asm/io.h>
@ -43,8 +44,15 @@ static const struct block_device_operations dcssblk_devops = {
.release = dcssblk_release,
};
static size_t dcssblk_dax_copy_from_iter(struct dax_device *dax_dev,
pgoff_t pgoff, void *addr, size_t bytes, struct iov_iter *i)
{
return copy_from_iter(addr, bytes, i);
}
static const struct dax_operations dcssblk_dax_ops = {
.direct_access = dcssblk_dax_direct_access,
.copy_from_iter = dcssblk_dax_copy_from_iter,
};
struct dcssblk_dev_info {