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devicemapper: Use device/inode of the root dir, not the image

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This way the devicemapper prefix stays stable even if we're not
using loopback mounted devices.
Upstream-commit: e6a73e65a23163273fa63d54b8f12530f7eef104
Component: engine
This commit is contained in:
Alexander Larsson
2013-10-17 09:53:09 +02:00
parent d2fc2c3021
commit 9f21580deb
1 changed files with 3 additions and 3 deletions
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6
components/engine/devmapper/deviceset_devmapper.go
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@@ -361,11 +361,11 @@ func (devices *DeviceSetDM) initDevmapper() error {
return err
}
// Set the device prefix from the device id and inode of the data image
// Set the device prefix from the device id and inode of the docker root dir
st, err := os.Stat(data)
st, err := os.Stat(devices.root)
if err != nil {
return fmt.Errorf("Error looking up data image %s: %s", data, err)
return fmt.Errorf("Error looking up dir %s: %s", devices.root, err)
}
sysSt := st.Sys().(*syscall.Stat_t)
// "reg-" stands for "regular file".