tree ab8deaaa5fbbd07cacb8e951d36fd9c7568aee97
parent abebfbe2f7315dd3ec9a0c69596a76e32beb5749
author Dan Williams <dan.j.williams@intel.com> 1496088466 -0700
committer Dan Williams <dan.j.williams@intel.com> 1497562524 -0700

filesystem-dax: convert to dax_flush()

Filesystem-DAX flushes caches whenever it writes to the address returned
through dax_direct_access() and when writing back dirty radix entries.
That flushing is only required in the pmem case, so the dax_flush()
helper skips cache management work when the underlying driver does not
specify a flush method.

We still do all the dirty tracking since the radix entry will already be
there for locking purposes. However, the work to clean the entry will be
a nop for some dax drivers.

Cc: Jeff Moyer <jmoyer@redhat.com>
Cc: Christoph Hellwig <hch@lst.de>
Cc: Matthew Wilcox <mawilcox@microsoft.com>
Cc: Ross Zwisler <ross.zwisler@linux.intel.com>
Reviewed-by: Jan Kara <jack@suse.cz>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>