From: Steve French stfrench@microsoft.com
commit cb8b02fd6343228966324528adf920bfb8b8e681 upstream.
There are two ways that special characters (not allowed in some other operating systems like Windows, but allowed in POSIX) have been mapped in the past ("SFU" and "SFM" mappings) to allow them to be stored in a range reserved for special chars. The default for Linux has been to use "mapposix" (ie the SFM mapping) but the conversion to the new mount API in the 5.11 kernel broke the ability to override the default mapping of the reserved characters (like '?' and '*' and '') via "mapchars" mount option.
This patch fixes that - so can now mount with "mapchars" mount option to override the default ("mapposix" ie SFM) mapping.
Reported-by: Tyler Spivey tspivey8@gmail.com Fixes: 24e0a1eff9e2 ("cifs: switch to new mount api") Signed-off-by: Steve French stfrench@microsoft.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- fs/cifs/fs_context.c | 8 ++++++++ 1 file changed, 8 insertions(+)
--- a/fs/cifs/fs_context.c +++ b/fs/cifs/fs_context.c @@ -884,6 +884,14 @@ static int smb3_fs_context_parse_param(s ctx->sfu_remap = false; /* disable SFU mapping */ } break; + case Opt_mapchars: + if (result.negated) + ctx->sfu_remap = false; + else { + ctx->sfu_remap = true; + ctx->remap = false; /* disable SFM (mapposix) mapping */ + } + break; case Opt_user_xattr: if (result.negated) ctx->no_xattr = 1;