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cifs: mapchars mount option ignored

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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: 24e0a1eff9 ("cifs: switch to new mount api")
Signed-off-by: Steve French <stfrench@microsoft.com>
This commit is contained in:
Steve French 2023-05-24 03:26:19 -05:00
parent 8b4dd44f9b
commit cb8b02fd63
1 changed files with 8 additions and 0 deletions
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8
fs/cifs/fs_context.c
View file

@ -904,6 +904,14 @@ static int smb3_fs_context_parse_param(struct fs_context *fc,
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;