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H A Dfile-posix.c64107dc0 Mon Oct 08 15:27:18 GMT 2018 Kevin Wolf <kwolf@redhat.com> file-posix: Support auto-read-only option

If read-only=off, but auto-read-only=on is given, open the file
read-write if we have the permissions, but instead of erroring out for
read-only files, just degrade to read-only.

Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>