github.com/rentongzhang/docker@v1.8.2-rc1/pkg/mount/mounter_freebsd.go (about)

     1  package mount
     2  
     3  /*
     4  #include <errno.h>
     5  #include <stdlib.h>
     6  #include <string.h>
     7  #include <sys/_iovec.h>
     8  #include <sys/mount.h>
     9  #include <sys/param.h>
    10  */
    11  import "C"
    12  
    13  import (
    14  	"fmt"
    15  	"strings"
    16  	"syscall"
    17  	"unsafe"
    18  )
    19  
    20  func allocateIOVecs(options []string) []C.struct_iovec {
    21  	out := make([]C.struct_iovec, len(options))
    22  	for i, option := range options {
    23  		out[i].iov_base = unsafe.Pointer(C.CString(option))
    24  		out[i].iov_len = C.size_t(len(option) + 1)
    25  	}
    26  	return out
    27  }
    28  
    29  func mount(device, target, mType string, flag uintptr, data string) error {
    30  	isNullFS := false
    31  
    32  	xs := strings.Split(data, ",")
    33  	for _, x := range xs {
    34  		if x == "bind" {
    35  			isNullFS = true
    36  		}
    37  	}
    38  
    39  	options := []string{"fspath", target}
    40  	if isNullFS {
    41  		options = append(options, "fstype", "nullfs", "target", device)
    42  	} else {
    43  		options = append(options, "fstype", mType, "from", device)
    44  	}
    45  	rawOptions := allocateIOVecs(options)
    46  	for _, rawOption := range rawOptions {
    47  		defer C.free(rawOption.iov_base)
    48  	}
    49  
    50  	if errno := C.nmount(&rawOptions[0], C.uint(len(options)), C.int(flag)); errno != 0 {
    51  		reason := C.GoString(C.strerror(*C.__error()))
    52  		return fmt.Errorf("Failed to call nmount: %s", reason)
    53  	}
    54  	return nil
    55  }
    56  
    57  func unmount(target string, flag int) error {
    58  	return syscall.Unmount(target, flag)
    59  }