func (*NullFS) Attach(req *srv.Req) {
if req.Afid != nil {
req.RespondError(srv.Enoauth)
return
}
req.Fid.Aux = &Fid{NullFile: NullFile{Name: "."}}
req.RespondRattach(dirQids["."])
}
func (f *NullFS) Stat(req *srv.Req) {
fid := req.Fid.Aux.(*Fid)
d := &ninep.Dir{
Qid: *fid.Qid,
Type: uint16(fid.Type),
Mode: uint32(fid.Type) | fid.Version,
Name: fid.Name,
Uid: "root",
Gid: "root",
}
req.RespondRstat(d)
}
func (f *NullFS) Walk(req *srv.Req) {
tc := req.Tc
if len(tc.Wname) > 1 && tc.Qid.Type != ninep.QTDIR {
req.RespondError(ninep.ENOENT)
return
}
// The most common case is walking from '.', so we initialize to '.' and fix it up
// later if needed.
if req.Newfid.Aux == nil {
req.Newfid.Aux = &Fid{NullFile: NullFile{Name: ".", Qid: dirQids["."]}}
}
if len(tc.Wname) == 0 {
req.RespondRwalk([]ninep.Qid{})
return
}
if q, ok := dirQids[tc.Wname[0]]; !ok {
req.RespondError(ninep.ENOENT)
} else {
req.Newfid.Aux.(*Fid).Name = tc.Wname[0]
req.Newfid.Aux.(*Fid).Qid = q
req.RespondRwalk([]ninep.Qid{*q})
}
}
func (f *NullFS) Read(r *srv.Req) {
var count int
ninep.InitRread(r.Rc, r.Tc.Count)
fid := r.Fid.Aux.(*Fid)
if fid.Qid.Path == Qroot {
var dirents []byte
for path, v := range dirQids {
d := &ninep.Dir{
Qid: *v,
Type: uint16(v.Type),
Mode: uint32(v.Type) | v.Version,
Name: path,
Uid: "root",
Gid: "root",
}
b := ninep.PackDir(d, true)
dirents = append(dirents, b...)
count += len(b)
}
// TODO: put this boilerplate into a helper function.
switch {
case r.Tc.Offset > uint64(len(dirents)):
count = 0
case len(dirents[r.Tc.Offset:]) > int(r.Tc.Count):
count = int(r.Tc.Count)
default:
count = len(dirents[r.Tc.Offset:])
}
if count == 0 && int(r.Tc.Offset) < len(dirents) && len(dirents) > 0 {
r.RespondError(&ninep.Error{Err: "too small read size for dir entry", Errornum: ninep.EINVAL})
return
}
copy(r.Rc.Data, dirents[r.Tc.Offset:int(r.Tc.Offset)+count])
} else {
if fid.Qid.Path == Qzero {
count = int(r.Tc.Count)
}
}
ninep.SetRreadCount(r.Rc, uint32(count))
r.Respond()
}
func (*Ufs) Stat(req *srv.Req) {
fid := req.Fid.Aux.(*Fid)
if err := fid.stat(); err != nil {
req.RespondError(err)
return
}
st, err := dir2Dir(fid.path, fid.st, req.Conn.Dotu, req.Conn.Srv.Upool)
if err != nil {
req.RespondError(err)
return
}
req.RespondRstat(st)
}
func (*Ufs) Remove(req *srv.Req) {
fid := req.Fid.Aux.(*Fid)
err := fid.stat()
if err != nil {
req.RespondError(err)
return
}
e := os.Remove(fid.path)
if e != nil {
req.RespondError(toError(e))
return
}
req.RespondRremove()
}
func (*Ufs) Write(req *srv.Req) {
fid := req.Fid.Aux.(*Fid)
tc := req.Tc
err := fid.stat()
if err != nil {
req.RespondError(err)
return
}
n, e := fid.file.WriteAt(tc.Data, int64(tc.Offset))
if e != nil {
req.RespondError(toError(e))
return
}
req.RespondRwrite(uint32(n))
}
func (*Ufs) Open(req *srv.Req) {
fid := req.Fid.Aux.(*Fid)
tc := req.Tc
err := fid.stat()
if err != nil {
req.RespondError(err)
return
}
var e error
fid.file, e = os.OpenFile(fid.path, omode2uflags(tc.Mode), 0)
if e != nil {
req.RespondError(toError(e))
return
}
req.RespondRopen(dir2Qid(fid.st), 0)
}
func (*Ufs) Walk(req *srv.Req) {
fid := req.Fid.Aux.(*Fid)
tc := req.Tc
err := fid.stat()
if err != nil {
req.RespondError(err)
return
}
if req.Newfid.Aux == nil {
req.Newfid.Aux = new(Fid)
}
nfid := req.Newfid.Aux.(*Fid)
wqids := make([]ninep.Qid, len(tc.Wname))
path := fid.path
i := 0
for ; i < len(tc.Wname); i++ {
p := path + "/" + tc.Wname[i]
st, err := os.Lstat(p)
if err != nil {
if i == 0 {
req.RespondError(Enoent)
return
}
break
}
wqids[i] = *dir2Qid(st)
path = p
}
nfid.path = path
req.RespondRwalk(wqids[0:i])
}
func (u *Ufs) Attach(req *srv.Req) {
if req.Afid != nil {
req.RespondError(srv.Enoauth)
return
}
tc := req.Tc
fid := new(Fid)
// You can think of the ufs.Root as a 'chroot' of a sort.
// client attaches are not allowed to go outside the
// directory represented by ufs.Root
fid.path = path.Join(u.Root, tc.Aname)
req.Fid.Aux = fid
err := fid.stat()
if err != nil {
req.RespondError(err)
return
}
qid := dir2Qid(fid.st)
req.RespondRattach(qid)
}
func (f *NullFS) Create(r *srv.Req) {
r.RespondError(srv.Eperm)
}
func (*NullFS) Clunk(req *srv.Req) { req.RespondRclunk() }
// Write handles writes for writeable files and always succeeds.
// Only the null files has w so we don't bother checking Path.
func (f *NullFS) Write(r *srv.Req) {
var count uint32
ninep.SetRreadCount(r.Rc, uint32(count))
r.Respond()
}
func (u *Ufs) Read(req *srv.Req) {
dbg := u.Debuglevel&srv.DbgLogFcalls != 0
fid := req.Fid.Aux.(*Fid)
tc := req.Tc
rc := req.Rc
err := fid.stat()
if err != nil {
req.RespondError(err)
return
}
ninep.InitRread(rc, tc.Count)
var count int
var e error
if fid.st.IsDir() {
if tc.Offset == 0 {
var e error
// If we got here, it was open. Can't really seek
// in most cases, just close and reopen it.
fid.file.Close()
if fid.file, e = os.OpenFile(fid.path, omode2uflags(req.Fid.Omode), 0); e != nil {
req.RespondError(toError(e))
return
}
if fid.dirs, e = fid.file.Readdir(-1); e != nil {
req.RespondError(toError(e))
return
}
if dbg {
log.Printf("Read: read %d entries", len(fid.dirs))
}
fid.dirents = nil
fid.direntends = nil
for i := 0; i < len(fid.dirs); i++ {
path := fid.path + "/" + fid.dirs[i].Name()
st, err := dir2Dir(path, fid.dirs[i], req.Conn.Dotu, req.Conn.Srv.Upool)
if err != nil {
if dbg {
log.Printf("dbg: stat of %v: %v", path, err)
}
continue
}
if dbg {
log.Printf("Stat: %v is %v", path, st)
}
b := ninep.PackDir(st, req.Conn.Dotu)
fid.dirents = append(fid.dirents, b...)
count += len(b)
fid.direntends = append(fid.direntends, count)
if dbg {
log.Printf("fid.direntends is %v\n", fid.direntends)
}
}
}
switch {
case tc.Offset > uint64(len(fid.dirents)):
count = 0
case len(fid.dirents[tc.Offset:]) > int(tc.Count):
count = int(tc.Count)
default:
count = len(fid.dirents[tc.Offset:])
}
if dbg {
log.Printf("readdir: count %v @ offset %v", count, tc.Offset)
}
nextend := sort.SearchInts(fid.direntends, int(tc.Offset)+count)
if nextend < len(fid.direntends) {
if fid.direntends[nextend] > int(tc.Offset)+count {
if nextend > 0 {
count = fid.direntends[nextend-1] - int(tc.Offset)
} else {
count = 0
}
}
}
if dbg {
log.Printf("readdir: count adjusted %v @ offset %v", count, tc.Offset)
}
if count == 0 && int(tc.Offset) < len(fid.dirents) && len(fid.dirents) > 0 {
req.RespondError(&ninep.Error{"too small read size for dir entry", ninep.EINVAL})
return
}
copy(rc.Data, fid.dirents[tc.Offset:int(tc.Offset)+count])
} else {
count, e = fid.file.ReadAt(rc.Data, int64(tc.Offset))
if e != nil && e != io.EOF {
req.RespondError(toError(e))
return
}
}
ninep.SetRreadCount(rc, uint32(count))
req.Respond()
}
func (*Ufs) Create(req *srv.Req) {
fid := req.Fid.Aux.(*Fid)
tc := req.Tc
err := fid.stat()
if err != nil {
req.RespondError(err)
return
}
path := fid.path + "/" + tc.Name
var e error = nil
var file *os.File = nil
switch {
case tc.Perm&ninep.DMDIR != 0:
e = os.Mkdir(path, os.FileMode(tc.Perm&0777))
case tc.Perm&ninep.DMSYMLINK != 0:
e = os.Symlink(tc.Ext, path)
case tc.Perm&ninep.DMLINK != 0:
n, e := strconv.ParseUint(tc.Ext, 10, 0)
if e != nil {
break
}
ofid := req.Conn.FidGet(uint32(n))
if ofid == nil {
req.RespondError(srv.Eunknownfid)
return
}
e = os.Link(ofid.Aux.(*Fid).path, path)
ofid.DecRef()
case tc.Perm&ninep.DMNAMEDPIPE != 0:
case tc.Perm&ninep.DMDEVICE != 0:
req.RespondError(&ninep.Error{"not implemented", ninep.EIO})
return
default:
var mode uint32 = tc.Perm & 0777
if req.Conn.Dotu {
if tc.Perm&ninep.DMSETUID > 0 {
mode |= syscall.S_ISUID
}
if tc.Perm&ninep.DMSETGID > 0 {
mode |= syscall.S_ISGID
}
}
file, e = os.OpenFile(path, omode2uflags(tc.Mode)|os.O_CREATE, os.FileMode(mode))
}
if file == nil && e == nil {
file, e = os.OpenFile(path, omode2uflags(tc.Mode), 0)
}
if e != nil {
req.RespondError(toError(e))
return
}
fid.path = path
fid.file = file
err = fid.stat()
if err != nil {
req.RespondError(err)
return
}
req.RespondRcreate(dir2Qid(fid.st), 0)
}
func (f *NullFS) Wstat(r *srv.Req) {
r.RespondError(srv.Eperm)
}
func (*Ufs) Clunk(req *srv.Req) { req.RespondRclunk() }
func (f *NullFS) Remove(r *srv.Req) {
r.RespondError(srv.Eperm)
}
func (f *NullFS) Open(r *srv.Req) {
r.RespondRopen(&r.Tc.Qid, 0)
}
func (u *Ufs) Wstat(req *srv.Req) {
var changed bool
fid := req.Fid.Aux.(*Fid)
err := fid.stat()
if err != nil {
req.RespondError(err)
return
}
dir := &req.Tc.Dir
if dir.Mode != 0xFFFFFFFF {
changed = true
mode := dir.Mode & 0777
if req.Conn.Dotu {
if dir.Mode&ninep.DMSETUID > 0 {
mode |= syscall.S_ISUID
}
if dir.Mode&ninep.DMSETGID > 0 {
mode |= syscall.S_ISGID
}
}
e := os.Chmod(fid.path, os.FileMode(mode))
if e != nil {
req.RespondError(toError(e))
return
}
}
uid, gid := ninep.NOUID, ninep.NOUID
if req.Conn.Dotu {
uid = dir.Uidnum
gid = dir.Gidnum
}
// Try to find local uid, gid by name.
if (dir.Uid != "" || dir.Gid != "") && !req.Conn.Dotu {
changed = true
uid, err = lookup(dir.Uid, false)
if err != nil {
req.RespondError(err)
return
}
// BUG(akumar): Lookup will never find gids
// corresponding to group names, because
// it only operates on user names.
gid, err = lookup(dir.Gid, true)
if err != nil {
req.RespondError(err)
return
}
}
if uid != ninep.NOUID || gid != ninep.NOUID {
changed = true
e := os.Chown(fid.path, int(uid), int(gid))
if e != nil {
req.RespondError(toError(e))
return
}
}
if dir.Name != "" {
changed = true
// If we path.Join dir.Name to / before adding it to
// the fid path, that ensures nobody gets to walk out of the
// root of this server.
newname := path.Join(path.Dir(fid.path), path.Join("/", dir.Name))
// absolute renaming. Ufs can do this, so let's support it.
// We'll allow an absolute path in the Name and, if it is,
// we will make it relative to root. This is a gigantic performance
// improvement in systems that allow it.
if filepath.IsAbs(dir.Name) {
newname = path.Join(u.Root, dir.Name)
}
err := syscall.Rename(fid.path, newname)
if err != nil {
req.RespondError(toError(err))
return
}
fid.path = newname
}
if dir.Length != 0xFFFFFFFFFFFFFFFF {
changed = true
e := os.Truncate(fid.path, int64(dir.Length))
if e != nil {
req.RespondError(toError(e))
return
}
}
// If either mtime or atime need to be changed, then
// we must change both.
if dir.Mtime != ^uint32(0) || dir.Atime != ^uint32(0) {
changed = true
mt, at := time.Unix(int64(dir.Mtime), 0), time.Unix(int64(dir.Atime), 0)
if cmt, cat := (dir.Mtime == ^uint32(0)), (dir.Atime == ^uint32(0)); cmt || cat {
st, e := os.Stat(fid.path)
if e != nil {
req.RespondError(toError(e))
return
}
switch cmt {
case true:
mt = st.ModTime()
default:
at = atime(st.Sys().(*syscall.Stat_t))
}
}
e := os.Chtimes(fid.path, at, mt)
if e != nil {
req.RespondError(toError(e))
return
}
}
if !changed && fid.file != nil {
fid.file.Sync()
}
req.RespondRwstat()
}