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go-fuse
Commit 1bb5cc5e authored by Ivan Krasin's avatar Ivan Krasin
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splitted mount.go and fuse.go

parent 9f3e25d0
Show whitespace changes
Inline Side-by-side
Showing with 173 additions and 162 deletions
fuse/Makefile
View file @ 1bb5cc5e
......@@ -5,6 +5,7 @@ TARG=github.com/krasin/go-fuse-zip/fuse
GOFILES=\
fuse.go\
mount.go\
types.go\
include $(GOROOT)/src/Make.pkg
......
fuse/fuse.go
View file @ 1bb5cc5e
......@@ -6,15 +6,7 @@ import (
"bytes"
"encoding/binary"
"fmt"
"net"
"os"
"path"
"syscall"
"unsafe"
)
const (
bufSize = 66000
)
type FileSystem interface {
......@@ -22,66 +14,28 @@ type FileSystem interface {
GetAttr(h *InHeader, in *GetAttrIn) (out *AttrOut, code Error)
}
type MountPoint struct {
mountPoint string
f *os.File
fs FileSystem
}
var was bool
// Mount create a fuse fs on the specified mount point.
func Mount(mountPoint string, fs FileSystem) (m *MountPoint, err os.Error, errors chan os.Error) {
local, remote, err := net.Socketpair("unixgram")
if err != nil {
return
}
defer local.Close()
defer remote.Close()
mountPoint = path.Clean(mountPoint)
if !path.Rooted(mountPoint) {
cwd, err := os.Getwd()
if err != nil {
return
}
mountPoint = path.Clean(path.Join(cwd, mountPoint))
}
pid, err := os.ForkExec("/bin/fusermount",
[]string{"/bin/fusermount", mountPoint},
[]string{"_FUSE_COMMFD=3"},
"",
[]*os.File{nil, nil, nil, remote.File()})
if err != nil {
return
}
w, err := os.Wait(pid, 0)
if err != nil {
return
}
if w.ExitStatus() != 0 {
err = os.NewError(fmt.Sprintf("fusermount exited with code %d\n", w.ExitStatus()))
return
}
type Mounted interface {
Unmount() (err os.Error)
}
f, err := getFuseConn(local)
func Mount(mountPoint string, fs FileSystem) (m Mounted, err os.Error, errors chan os.Error) {
f, m, err := mount(mountPoint)
if err != nil {
return
}
m = &MountPoint{mountPoint, f, fs}
errors = make(chan os.Error, 100)
go m.loop(errors)
go loop(f, fs, errors)
return
}
func (m *MountPoint) loop(errors chan os.Error) {
func loop(f *os.File, fs FileSystem, errors chan os.Error) {
buf := make([]byte, bufSize)
f := m.f
defer close(errors)
toW := make(chan [][]byte, 100)
defer close(toW)
go m.writer(f, toW, errors)
go writer(f, toW, errors)
for {
n, err := f.Read(buf)
if err == os.EOF {
......@@ -92,7 +46,7 @@ func (m *MountPoint) loop(errors chan os.Error) {
break
}
handle(m.fs, buf[0:n], toW, errors)
handle(fs, buf[0:n], toW, errors)
}
}
......@@ -230,7 +184,7 @@ func handle(fs FileSystem, in_data []byte, toW chan [][]byte, errors chan os.Err
toW <- [][]byte{b.Bytes()}
}
func (m *MountPoint) writer(f *os.File, in chan [][]byte, errors chan os.Error) {
func writer(f *os.File, in chan [][]byte, errors chan os.Error) {
fd := f.Fd()
for packet := range in {
fmt.Printf("writer, packet: %v\n", packet)
......@@ -243,109 +197,3 @@ func (m *MountPoint) writer(f *os.File, in chan [][]byte, errors chan os.Error)
}
}
func (m *MountPoint) Unmount() (err os.Error) {
if m == nil {
return nil
}
pid, err := os.ForkExec("/bin/fusermount",
[]string{"/bin/fusermount", "-u", m.mountPoint},
nil,
"",
[]*os.File{nil, nil, os.Stderr})
if err != nil {
return
}
w, err := os.Wait(pid, 0)
if err != nil {
return
}
if w.ExitStatus() != 0 {
return os.NewError(fmt.Sprintf("fusermount exited with code %d\n", w.ExitStatus()))
}
m.f.Close()
return
}
func recvmsg(fd int, msg *syscall.Msghdr, flags int) (n int, errno int) {
n1, _, e1 := syscall.Syscall(syscall.SYS_RECVMSG, uintptr(fd), uintptr(unsafe.Pointer(msg)), uintptr(flags))
n = int(n1)
errno = int(e1)
return
}
func Recvmsg(fd int, msg *syscall.Msghdr, flags int) (n int, err os.Error) {
n, errno := recvmsg(fd, msg, flags)
if n == 0 && errno == 0 {
return 0, os.EOF
}
if errno != 0 {
err = os.NewSyscallError("recvmsg", errno)
}
return
}
func writev(fd int, iovecs *syscall.Iovec, cnt int) (n int, errno int) {
n1, _, e1 := syscall.Syscall(syscall.SYS_WRITEV, uintptr(fd), uintptr(unsafe.Pointer(iovecs)), uintptr(cnt))
n = int(n1)
errno = int(e1)
return
}
func Writev(fd int, packet [][]byte) (n int, err os.Error) {
if len(packet) == 0 {
return
}
iovecs := make([]syscall.Iovec, len(packet))
for i, v := range packet {
if v == nil {
continue
}
iovecs[i].Base = (*byte)(unsafe.Pointer(&packet[i][0]))
iovecs[i].Len = uint64(len(packet[i]))
}
n, errno := writev(fd, (*syscall.Iovec)(unsafe.Pointer(&iovecs[0])), len(iovecs))
if errno != 0 {
err = os.NewSyscallError("writev", errno)
return
}
return
}
func getFuseConn(local net.Conn) (f *os.File, err os.Error) {
var msg syscall.Msghdr
var iov syscall.Iovec
base := make([]int32, 256)
control := make([]int32, 256)
iov.Base = (*byte)(unsafe.Pointer(&base[0]))
iov.Len = uint64(len(base) * 4)
msg.Iov = (*syscall.Iovec)(unsafe.Pointer(&iov))
msg.Iovlen = 1
msg.Control = (*byte)(unsafe.Pointer(&control[0]))
msg.Controllen = uint64(len(control) * 4)
_, err = Recvmsg(local.File().Fd(), &msg, 0)
if err != nil {
return
}
length := control[0]
typ := control[2] // syscall.Cmsghdr.Type
fd := control[4]
if typ != 1 {
err = os.NewError(fmt.Sprintf("getFuseConn: recvmsg returned wrong control type: %d", typ))
return
}
if length < 20 {
err = os.NewError(fmt.Sprintf("getFuseConn: too short control message. Length: %d", length))
return
}
if fd < 0 {
err = os.NewError(fmt.Sprintf("getFuseConn: fd < 0: %d", fd))
return
}
f = os.NewFile(int(fd), "fuse-conn")
return
}
fuse/mount.go 0 → 100644
View file @ 1bb5cc5e
package fuse
// Written with a look to http://ptspts.blogspot.com/2009/11/fuse-protocol-tutorial-for-linux-26.html
import (
"fmt"
"net"
"os"
"path"
"syscall"
"unsafe"
)
const (
bufSize = 66000
)
type mounted string
// Mount create a fuse fs on the specified mount point.
func mount(mountPoint string) (f *os.File, m mounted, err os.Error) {
local, remote, err := net.Socketpair("unixgram")
if err != nil {
return
}
defer local.Close()
defer remote.Close()
mountPoint = path.Clean(mountPoint)
if !path.Rooted(mountPoint) {
cwd, err := os.Getwd()
if err != nil {
return
}
mountPoint = path.Clean(path.Join(cwd, mountPoint))
}
pid, err := os.ForkExec("/bin/fusermount",
[]string{"/bin/fusermount", mountPoint},
[]string{"_FUSE_COMMFD=3"},
"",
[]*os.File{nil, nil, nil, remote.File()})
if err != nil {
return
}
w, err := os.Wait(pid, 0)
if err != nil {
return
}
if w.ExitStatus() != 0 {
err = os.NewError(fmt.Sprintf("fusermount exited with code %d\n", w.ExitStatus()))
return
}
f, err = getFuseConn(local)
m = mounted(mountPoint)
return
}
func (m mounted) Unmount() (err os.Error) {
mountPoint := string(m)
pid, err := os.ForkExec("/bin/fusermount",
[]string{"/bin/fusermount", "-u", mountPoint},
nil,
"",
[]*os.File{nil, nil, os.Stderr})
if err != nil {
return
}
w, err := os.Wait(pid, 0)
if err != nil {
return
}
if w.ExitStatus() != 0 {
return os.NewError(fmt.Sprintf("fusermount exited with code %d\n", w.ExitStatus()))
}
return
}
func recvmsg(fd int, msg *syscall.Msghdr, flags int) (n int, errno int) {
n1, _, e1 := syscall.Syscall(syscall.SYS_RECVMSG, uintptr(fd), uintptr(unsafe.Pointer(msg)), uintptr(flags))
n = int(n1)
errno = int(e1)
return
}
func Recvmsg(fd int, msg *syscall.Msghdr, flags int) (n int, err os.Error) {
n, errno := recvmsg(fd, msg, flags)
if n == 0 && errno == 0 {
return 0, os.EOF
}
if errno != 0 {
err = os.NewSyscallError("recvmsg", errno)
}
return
}
func writev(fd int, iovecs *syscall.Iovec, cnt int) (n int, errno int) {
n1, _, e1 := syscall.Syscall(syscall.SYS_WRITEV, uintptr(fd), uintptr(unsafe.Pointer(iovecs)), uintptr(cnt))
n = int(n1)
errno = int(e1)
return
}
func Writev(fd int, packet [][]byte) (n int, err os.Error) {
if len(packet) == 0 {
return
}
iovecs := make([]syscall.Iovec, len(packet))
for i, v := range packet {
if v == nil {
continue
}
iovecs[i].Base = (*byte)(unsafe.Pointer(&packet[i][0]))
iovecs[i].Len = uint64(len(packet[i]))
}
n, errno := writev(fd, (*syscall.Iovec)(unsafe.Pointer(&iovecs[0])), len(iovecs))
if errno != 0 {
err = os.NewSyscallError("writev", errno)
return
}
return
}
func getFuseConn(local net.Conn) (f *os.File, err os.Error) {
var msg syscall.Msghdr
var iov syscall.Iovec
base := make([]int32, 256)
control := make([]int32, 256)
iov.Base = (*byte)(unsafe.Pointer(&base[0]))
iov.Len = uint64(len(base) * 4)
msg.Iov = (*syscall.Iovec)(unsafe.Pointer(&iov))
msg.Iovlen = 1
msg.Control = (*byte)(unsafe.Pointer(&control[0]))
msg.Controllen = uint64(len(control) * 4)
_, err = Recvmsg(local.File().Fd(), &msg, 0)
if err != nil {
return
}
length := control[0]
typ := control[2] // syscall.Cmsghdr.Type
fd := control[4]
if typ != 1 {
err = os.NewError(fmt.Sprintf("getFuseConn: recvmsg returned wrong control type: %d", typ))
return
}
if length < 20 {
err = os.NewError(fmt.Sprintf("getFuseConn: too short control message. Length: %d", length))
return
}
if fd < 0 {
err = os.NewError(fmt.Sprintf("getFuseConn: fd < 0: %d", fd))
return
}
f = os.NewFile(int(fd), "fuse-conn")
return
}
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