On Wed, Sep 04, 2013 at 08:54:57AM +0800, Ian Kent wrote:
> +static int kern_path_top(const char *pathname,
> + unsigned int flags, struct path *path)
> +{
> + struct dentry *dentry;
> + struct qstr name;
> + const char *tmp;
> + unsigned int len;
> + int err;
> +
> + len = strlen(pathname);
> + if (len <= 1)
> + return -EINVAL;
> +
> + tmp = pathname + len - 1;
> + len = 0;
> + if (*tmp == '/')
> + tmp--;
> + do {
> + if (*tmp == '/')
> + break;
> + len++;
> + } while (--tmp >= pathname);
> + tmp++;
> +
> + err = kern_path(pathname, flags | LOOKUP_PARENT, path);
> + if (err)
> + return err;
> +
> + name.name = tmp;
> + name.len = len;
> + name.hash = full_name_hash(tmp, len);
> +
> + dentry = d_lookup(path->dentry, &name);
> + if (!dentry) {
> + path_put(path);
> + return -ENOENT;
> + }
> + dput(path->dentry);
> + path->dentry = dentry;
> +
> + while (follow_down_one(path))
> + ;
> +
> + return 0;
> +}
Ewwww... NAK in that form. Just what will happen if the last component
given to that sucker will be . or .., for starters? Or a symlink, with
'/' added to it to force following the damn thing?
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