Commit 388bc034 authored by Shiyang Ruan's avatar Shiyang Ruan Committed by Andrew Morton
Browse files

fsdax: dax_unshare_iter() should return a valid length 

The copy_mc_to_kernel() will return 0 if it executed successfully.  Then
the return value should be set to the length it copied.

[akpm@linux-foundation.org: don't mess up `ret', per Matthew]
Link: https://lkml.kernel.org/r/1675341227-14-1-git-send-email-ruansy.fnst@fujitsu.com


Fixes: d984648e ("fsdax,xfs: port unshare to fsdax")
Signed-off-by: default avatarShiyang Ruan <ruansy.fnst@fujitsu.com>
Cc: Darrick J. Wong <djwong@kernel.org>
Cc: Alistair Popple <apopple@nvidia.com>
Cc: Dan Williams <dan.j.williams@intel.com>
Cc: Dave Chinner <david@fromorbit.com>
Cc: Jason Gunthorpe <jgg@nvidia.com>
Cc: John Hubbard <jhubbard@nvidia.com>
Cc: Matthew Wilcox <willy@infradead.org>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
parent aa1e6a93

fs/dax.c

+3 −2
Original line number Diff line number Diff line
@@ -1271,8 +1271,9 @@ static s64 dax_unshare_iter(struct iomap_iter *iter) 
	if (ret < 0)

		goto out_unlock;



	ret = copy_mc_to_kernel(daddr, saddr, length);

	if (ret)

	if (copy_mc_to_kernel(daddr, saddr, length) == 0)

		ret = length;

	else

		ret = -EIO;



out_unlock: