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| H A D | dax.c | 708dfad2 Thu Dec 01 09:28:53 CST 2022 Shiyang Ruan <ruansy.fnst@fujitsu.com> fsdax: zero the edges if source is HOLE or UNWRITTEN
If srcmap contains invalid data, such as HOLE and UNWRITTEN, the dest page
should be zeroed. Otherwise, since it's a pmem, old data may remains on
the dest page, the result of CoW will be incorrect.
The function name is also not easy to understand, rename it to
"dax_iomap_copy_around()", which means it copies data around the range.
[akpm@linux-foundation.org: update dax_iomap_copy_around() kerneldoc, per Darrick]
Link: https://lkml.kernel.org/r/1669973145-318-1-git-send-email-ruansy.fnst@fujitsu.com
Link: https://lkml.kernel.org/r/1669908538-55-4-git-send-email-ruansy.fnst@fujitsu.com
Signed-off-by: Shiyang Ruan <ruansy.fnst@fujitsu.com>
Reviewed-by: Darrick J. Wong <djwong@kernel.org>
Reviewed-by: Allison Henderson <allison.henderson@oracle.com>
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>
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