fsdax: add dax_iomap_cow_copy() for dax zero
authorShiyang Ruan <ruansy.fnst@fujitsu.com>
Fri, 3 Jun 2022 05:37:35 +0000 (13:37 +0800)
committerakpm <akpm@linux-foundation.org>
Mon, 18 Jul 2022 00:14:31 +0000 (17:14 -0700)
commit8dbfc76da30472cfa07218a27eaaa538f0a49551
tree982c897aababc1dcca77affc011c0d4967bbbbd1
parente5d6df73302c8d1e7ab2d3555f0faafd0d4b0027
fsdax: add dax_iomap_cow_copy() for dax zero

Punch hole on a reflinked file needs dax_iomap_cow_copy() too.  Otherwise,
data in not aligned area will be not correct.  So, add the CoW operation
for not aligned case in dax_memzero().

Link: https://lkml.kernel.org/r/20220603053738.1218681-12-ruansy.fnst@fujitsu.com
Signed-off-by: Shiyang Ruan <ruansy.fnst@fujitsu.com>
Reviewed-by: Ritesh Harjani <riteshh@linux.ibm.com>
Reviewed-by: Darrick J. Wong <djwong@kernel.org>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Cc: Dan Williams <dan.j.wiliams@intel.com>
Cc: Dan Williams <dan.j.williams@intel.com>
Cc: Dave Chinner <david@fromorbit.com>
Cc: Goldwyn Rodrigues <rgoldwyn@suse.com>
Cc: Goldwyn Rodrigues <rgoldwyn@suse.de>
Cc: Jane Chu <jane.chu@oracle.com>
Cc: Matthew Wilcox <willy@infradead.org>
Cc: Miaohe Lin <linmiaohe@huawei.com>
Cc: Naoya Horiguchi <naoya.horiguchi@nec.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
fs/dax.c