func (srv *Srv) read(req *Req) {
tc := req.Tc
fid := req.Fid
if tc.Count+ninep.IOHDRSZ > req.Conn.Msize {
req.RespondError(Etoolarge)
return
}
if (fid.Type & ninep.QTAUTH) != 0 {
var n int
rc := req.Rc
err := ninep.InitRread(rc, tc.Count)
if err != nil {
req.RespondError(err)
return
}
if op, ok := (req.Conn.Srv.ops).(AuthOps); ok {
n, err = op.AuthRead(fid, tc.Offset, rc.Data)
if err != nil {
req.RespondError(err)
return
}
ninep.SetRreadCount(rc, uint32(n))
req.Respond()
} else {
req.RespondError(Enotimpl)
}
return
}
if !fid.opened || (fid.Omode&3) == ninep.OWRITE {
req.RespondError(Ebaduse)
return
}
if (fid.Type & ninep.QTDIR) != 0 {
fid.Lock()
if tc.Offset == 0 {
fid.Diroffset = 0
} else if tc.Offset != fid.Diroffset {
// This used to be an error, at this
// level. But maybe the provider can handle
// offsets that change. In one version of 9p
// we were able to support arbitrary
// offsets. At the least, we're going to let
// the provider decide if this is an error.
fid.Diroffset = tc.Offset
}
fid.Unlock()
}
(req.Conn.Srv.ops).(ReqOps).Read(req)
}
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 (*Fsrv) Read(req *Req) {
var i, n int
var err error
fid := req.Fid.Aux.(*FFid)
f := fid.F
tc := req.Tc
rc := req.Rc
ninep.InitRread(rc, tc.Count)
if f.Mode&ninep.DMDIR != 0 {
// directory
f.Lock()
if tc.Offset == 0 {
var g *File
for n, g = 0, f.cfirst; g != nil; n, g = n+1, g.next {
}
fid.dirs = make([]*File, n)
for n, g = 0, f.cfirst; g != nil; n, g = n+1, g.next {
fid.dirs[n] = g
}
}
n = 0
b := rc.Data
// only return whole entries.
for i = 0; i < len(fid.dirs); i++ {
g := fid.dirs[i]
g.Lock()
if (g.flags & Fremoved) != 0 {
g.Unlock()
continue
}
nd := ninep.PackDir(&g.Dir, req.Conn.Dotu)
g.Unlock()
if len(nd) > len(b) {
break
}
copy(b, nd)
b = b[len(nd):]
n += len(nd)
}
fid.dirs = fid.dirs[i:]
f.Unlock()
} else {
// file
if rop, ok := f.Ops.(FReadOp); ok {
n, err = rop.Read(fid, rc.Data, tc.Offset)
if err != nil {
req.RespondError(err)
return
}
} else {
req.RespondError(Eperm)
return
}
}
ninep.SetRreadCount(rc, uint32(n))
req.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()
}