Re: A little question about safe mode

on 18/10/2012 18:33 Andriy Gapon said the following:
> on 18/10/2012 18:20 Andriy Gapon said the following:
>> My guess is that the easiest way to avoid this ambiguity and the confusion that it
>> causes (like the problem you described above) is to prepend "/dev/", if it's
>> missing, right in vfs_mountroot.c before calling kernel_mount().
> 
> A patch (not tested):
> 
> --- a/sys/kern/vfs_mountroot.c
> +++ b/sys/kern/vfs_mountroot.c
> _at__at_ -676,6 +676,7 _at__at_ static int
>  parse_mount(char **conf)
>  {
>  	char errmsg[255];
> +	char devbuf[MNAMELEN];
>  	struct mntarg *ma;
>  	char *dev, *fs, *opts, *tok;
>  	int delay, error, timeout;
> _at__at_ -693,6 +694,11 _at__at_ parse_mount(char **conf)
>  	parse_advance(&tok);
>  	dev = tok;
> 
> +	if (dev[0] != '\0' && strncmp(dev, "/dev/", 5) != 0) {
> +		snprintf(devbuf, sizeof(devbuf), "/dev/%s", dev);
> +		dev = devbuf;
> +	}
> +
>  	if (root_mount_mddev != -1) {
>  		/* Handle substitution for the md unit number. */
>  		tok = strstr(dev, "md#");
> 
> 

Oops, the patch incorrectly assumes that all "device names" are device names,
which is incorrect e.g. for ZFS.  Maybe some other filesystems too.
So don't try it :-)

-- 
Andriy Gapon