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moby--moby/daemon/graphdriver/zfs/zfs_solaris.go

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// +build solaris,cgo
package zfs
/*
#include <sys/statvfs.h>
#include <stdlib.h>
static inline struct statvfs *getstatfs(char *s) {
struct statvfs *buf;
int err;
buf = (struct statvfs *)malloc(sizeof(struct statvfs));
err = statvfs(s, buf);
return buf;
}
*/
import "C"
import (
"path/filepath"
"strings"
"unsafe"
"github.com/Sirupsen/logrus"
"github.com/docker/docker/daemon/graphdriver"
)
func checkRootdirFs(rootdir string) error {
cs := C.CString(filepath.Dir(rootdir))
buf := C.getstatfs(cs)
// on Solaris buf.f_basetype contains ['z', 'f', 's', 0 ... ]
if (buf.f_basetype[0] != 122) || (buf.f_basetype[1] != 102) || (buf.f_basetype[2] != 115) ||
(buf.f_basetype[3] != 0) {
logrus.Debugf("[zfs] no zfs dataset found for rootdir '%s'", rootdir)
C.free(unsafe.Pointer(buf))
return graphdriver.ErrPrerequisites
}
C.free(unsafe.Pointer(buf))
C.free(unsafe.Pointer(cs))
return nil
}
/* rootfs is introduced to comply with the OCI spec
which states that root filesystem must be mounted at <CID>/rootfs/ instead of <CID>/
*/
func getMountpoint(id string) string {
maxlen := 12
// we need to preserve filesystem suffix
suffix := strings.SplitN(id, "-", 2)
if len(suffix) > 1 {
return filepath.Join(id[:maxlen]+"-"+suffix[1], "rootfs", "root")
}
return filepath.Join(id[:maxlen], "rootfs", "root")
}