[PATCH 4/6] fsconfig: parse "subtype" param for old internal API

[Miklos Szeredi]

This subtype thing is specific to "fuse" and "fuseblk" filesystems.  When these
are switched over to the new context API, the handling of this parameter can be
moved from legacy_parse_param() into fuse.

Signed-off-by: Miklos Szeredi <mszer...@redhat.com>
---
 fs/fs_context.c | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/fs/fs_context.c b/fs/fs_context.c
index c0ecbb1ecdfe..0192456712d2 100644
--- a/fs/fs_context.c
+++ b/fs/fs_context.c
@@ -574,6 +574,16 @@ static int legacy_parse_param(struct fs_context *fc, 
struct fs_parameter *param)
                param->string = NULL;
                return 0;
        }
+       if ((fc->fs_type->fs_flags & FS_HAS_SUBTYPE) &&
+           strcmp(param->key, "subtype") == 0) {
+               if (param->type != fs_value_is_string)
+                       return invalf(fc, "VFS: Legacy: Non-string subtype");
+               if (fc->subtype)
+                       return invalf(fc, "VFS: Legacy: Multiple subtype");
+               fc->subtype = param->string;
+               param->string= NULL;
+               return 0;
+       }
 
        if (ctx->param_type != LEGACY_FS_UNSET_PARAMS &&
            ctx->param_type != LEGACY_FS_INDIVIDUAL_PARAMS)
-- 
2.14.3