+ fsdax-dax_unshare_iter-should-return-a-valid-length.patch added to mm-hotfixes-unstable branch

+ fsdax-dax_unshare_iter-should-return-a-valid-length.patch added to mm-hotfixes-unstable branch

[Andrew Morton]

The patch titled
     Subject: fsdax: dax_unshare_iter() should return a valid length
has been added to the -mm mm-hotfixes-unstable branch.  Its filename is
     fsdax-dax_unshare_iter-should-return-a-valid-length.patch

This patch will shortly appear at
     https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/fsdax-dax_unshare_iter-should-return-a-valid-length.patch

This patch will later appear in the mm-hotfixes-unstable branch at
    git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm

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------------------------------------------------------
From: Shiyang Ruan <ruansy.fnst@fujitsu.com>
Subject: fsdax: dax_unshare_iter() should return a valid length
Date: Thu, 2 Feb 2023 12:33:47 +0000

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

Link: https://lkml.kernel.org/r/1675341227-14-1-git-send-email-ruansy.fnst@fujitsu.com
Fixes: d984648e428b ("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>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---


--- a/fs/dax.c~fsdax-dax_unshare_iter-should-return-a-valid-length
+++ a/fs/dax.c
@@ -1274,6 +1274,7 @@ static s64 dax_unshare_iter(struct iomap
 	ret = copy_mc_to_kernel(daddr, saddr, length);
 	if (ret)
 		ret = -EIO;
+	ret = length;
 
 out_unlock:
 	dax_read_unlock(id);
_

Patches currently in -mm which might be from ruansy.fnst@fujitsu.com are

fsdax-dax_unshare_iter-should-return-a-valid-length.patch