Re: [Qemu-devel] [PATCH 4/6] fsdev: Error out when unsupported option is passed

[Greg Kurz <groug@kaod.org>]

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On Wed, 8 May 2019 11:23:46 -0500
Eric Blake <eblake@redhat.com> wrote:

> On 5/7/19 3:45 AM, Greg Kurz wrote:
> > Each fsdriver only supports a subset of the options that can be passed
> > to -fsdev. Unsupported options are simply ignored. This could cause the
> > user to erroneously think QEMU has a bug.
> > 
> > Enforce strict checking of supported options for all fsdrivers. This
> > shouldn't impact libvirt, since it doesn't know about he synth and  
> 
> s/he/the/
> 
> > proxy fsdrivers.
> > 
> > Signed-off-by: Greg Kurz <groug@kaod.org>
> > ---
> >  fsdev/qemu-fsdev.c |   74 ++++++++++++++++++++++++++++++++++++++++++++++++++--
> >  1 file changed, 71 insertions(+), 3 deletions(-)
> >   
> 
> > 
> > +#define COMMON_FS_DRIVER_OPTIONS "id", "fsdriver", "readonly"
> > +
> >  static FsDriverTable FsDrivers[] = {
> > -    { .name = "local", .ops = &local_ops},
> > -    { .name = "synth", .ops = &synth_ops},
> > -    { .name = "proxy", .ops = &proxy_ops},
> > +    {
> > +        .name = "local",
> > +        .ops = &local_ops,
> > +        .opts = (const char * []) {
> > +            COMMON_FS_DRIVER_OPTIONS,
> > +            "security_model",  
> 
> 
> > +static int validate_opt(void *opaque, const char *name, const char *value,
> > +                        Error **errp)
> > +{
> > +    FsDriverTable *drv = opaque;
> > +    const char **opt;
> > +
> > +    for (opt = drv->opts; *opt; opt++) {
> > +        if (!strcmp(*opt, name)) {
> > +            return 0;
> > +        }
> > +    }
> > +
> > +    error_setg(errp, "'%s' is invalid for fsdriver '%s'", name, drv->name);
> > +    return -1;
> > +}  
> 
> When we ever reach command-line QAPIfication, this might go away. In the
> meantime, this is an improvement.
> 
> Reviewed-by: Eric Blake <eblake@redhat.com>
> 

Fixed the typo in the changelog and applied to https://github.com/gkurz/qemu/commits/9p-next 

Cheers,

--
Greg

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