about proxy_store, is this a bug?

[sigma]

my config:
        location / {
            root /data/www;
            error_page 404 = /fetch$uri;
        }
        location /fetch {
            internal;
            proxy_pass http://backend;
            proxy_store on;
            proxy_store_access user:rw group:r all:r;
            proxy_temp_path /tmp;
            alias /data/www;
        }

the /tmp is in /dev/sda1 and the /data/www is in /dev/mapper/data(LVM)

then proxy_store  invalid

the error_log:
2008/07/24 04:15:12 [crit] 28123#0: *2555263 rename() "/tmp/0000370403" to
"/data/www/dm/g/gsmmx21/Vol_289/017.jpg" failed (18: Invalid cross-device
link) while reading upstream, ....

is it a bug?

Thanks !

-- 
Best Regards, sigma

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