[PATCH] fs/cifs: don't translate SFM_SLASH (U+F026) to backslash

[Steve French]

Tentatively merged into cifs-2.6.git for-next but would like a little
more experimentation with it if possible (or description of what
scenarios/servers have been tried)
On Mon, Jul 9, 2018 at 9:53 AM Jon Kuhn <jkuhn at barracuda.com> wrote:
>
> When a Mac client saves an item containing a backslash to a file server
> the backslash is represented in the CIFS/SMB protocol as as U+F026.
> Before this change, listing a directory containing an item with a
> backslash in its name will return that item with the backslash
> represented with a true backslash character (U+005C) because
> convert_sfm_character mapped U+F026 to U+005C when interpretting the
> CIFS/SMB protocol response.  However, attempting to open or stat the
> path using a true backslash will result in an error because
> convert_to_sfm_char does not map U+005C back to U+F026 causing the
> CIFS/SMB request to be made with the backslash represented as U+005C.
>
> This change simply prevents the U+F026 to U+005C conversion from
> happenning.  This is analogous to how the code does not do any
> translation of UNI_SLASH (U+F000).
>
> Signed-off-by: Jon Kuhn <jkuhn at barracuda.com>
> ---
>  fs/cifs/cifs_unicode.c | 3 ---
>  1 file changed, 3 deletions(-)
>
> diff --git a/fs/cifs/cifs_unicode.c b/fs/cifs/cifs_unicode.c
> index b380e087..a2b2355e 100644
> --- a/fs/cifs/cifs_unicode.c
> +++ b/fs/cifs/cifs_unicode.c
> @@ -105,9 +105,6 @@ convert_sfm_char(const __u16 src_char, char *target)
>         case SFM_LESSTHAN:
>                 *target = '<';
>                 break;
> -       case SFM_SLASH:
> -               *target = '\\';
> -               break;
>         case SFM_SPACE:
>                 *target = ' ';
>                 break;
> --
> 2.17.1
>
>
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-- 
Thanks,

Steve