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fsdax: dax_unshare_iter() should return a valid length

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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: d984648e42 ("fsdax,xfs: port unshare to fsdax")
Signed-off-by: Shiyang 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: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Shiyang Ruan 2023-02-02 12:33:47 +00:00 committed by Andrew Morton
parent aa1e6a932c
commit 388bc034d9
1 changed files with 3 additions and 2 deletions
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5
fs/dax.c
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@ -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: