[sheepdog] [PATCH] add early test for xattr support

[MORITA Kazutaka]

At Wed, 18 Jul 2012 12:12:59 +0200,
Dietmar Maurer wrote:
> 
> We want to detect that early and prevent startup. Else the daemon starts
> and simply crash with panic() later.
> 
> Signed-off-by: Dietmar Maurer <dietmar at proxmox.com>
> ---
>  sheep/sheep.c |    6 ++++++
>  1 files changed, 6 insertions(+), 0 deletions(-)
> 
> diff --git a/sheep/sheep.c b/sheep/sheep.c
> index b3a12e3..307d013 100644
> --- a/sheep/sheep.c
> +++ b/sheep/sheep.c
> @@ -20,6 +20,7 @@
>  #include <linux/limits.h>
>  #include <sys/syslog.h>
>  #include <sys/types.h>
> +#include <sys/xattr.h>
>  #include <sys/stat.h>
>  #include <fcntl.h>
>  #include <errno.h>
> @@ -258,6 +259,11 @@ int main(int argc, char **argv)
>  	if (ret)
>  		exit(1);
>  
> +	if ((listxattr(dir, NULL, 0) == -1) && (errno == ENOTSUP)) {
> +		fprintf(stderr, "missing xattr support on %s\n", dir);
> +		exit(1);
> +	}
> +

Should we check this in farm_init() since only farm uses extended
attributes?  Currently, there is no other storage driver than farm and
the check will be executed in either way, though.

Thanks,

Kazutaka