func (c *serveConn) saveNode(inode uint64, node Node) (id fuse.NodeID, gen uint64) {
c.meta.Lock()
defer c.meta.Unlock()
var ref *NodeRef
if nodeRef, ok := node.(nodeRef); ok {
ref = nodeRef.nodeRef()
if ref.id != 0 {
// dropNode guarantees that NodeRef is zeroed at the same
// time as the NodeID is removed from serveConn.node, as
// guarded by c.meta; this means sn cannot be nil here
sn := c.node[ref.id]
sn.refs++
return ref.id, ref.generation
}
}
sn := &serveNode{inode: inode, node: node, refs: 1}
if n := len(c.freeNode); n > 0 {
id = c.freeNode[n-1]
c.freeNode = c.freeNode[:n-1]
c.node[id] = sn
c.nodeGen++
} else {
id = fuse.NodeID(len(c.node))
c.node = append(c.node, sn)
}
gen = c.nodeGen
if ref != nil {
ref.id = id
ref.generation = gen
}
return
}
func (c *serveConn) serve(r fuse.Request) {
intr := make(Intr)
req := &serveRequest{Request: r, Intr: intr}
dprintf("%v\n", request{
Op: opName(r),
Request: r.Hdr(),
In: r,
})
var node Node
var snode *serveNode
c.meta.Lock()
hdr := r.Hdr()
if id := hdr.Node; id != 0 {
if id < fuse.NodeID(len(c.node)) {
snode = c.node[uint(id)]
}
if snode == nil {
c.meta.Unlock()
dprintf("%v\n", response{
Op: opName(r),
Request: logResponseHeader{ID: hdr.ID},
Error: fuse.ESTALE.ErrnoName(),
// this is the only place that sets both Error and
// Out; not sure if i want to do that; might get rid
// of len(c.node) things altogether
Out: logMissingNode{
MaxNode: fuse.NodeID(len(c.node)),
},
})
r.RespondError(fuse.ESTALE)
return
}
node = snode.node
}
if c.req[hdr.ID] != nil {
// This happens with OSXFUSE. Assume it's okay and
// that we'll never see an interrupt for this one.
// Otherwise everything wedges. TODO: Report to OSXFUSE?
//
// TODO this might have been because of missing done() calls
intr = nil
} else {
c.req[hdr.ID] = req
}
c.meta.Unlock()
// Call this before responding.
// After responding is too late: we might get another request
// with the same ID and be very confused.
done := func(resp interface{}) {
msg := response{
Op: opName(r),
Request: logResponseHeader{ID: hdr.ID},
}
if err, ok := resp.(error); ok {
msg.Error = err.Error()
if ferr, ok := err.(fuse.ErrorNumber); ok {
errno := ferr.Errno()
msg.Errno = errno.ErrnoName()
if errno == err {
// it's just a fuse.Errno with no extra detail;
// skip the textual message for log readability
msg.Error = ""
}
} else {
msg.Errno = fuse.DefaultErrno.ErrnoName()
}
} else {
msg.Out = resp
}
dprintf("%v\n", msg)
c.meta.Lock()
delete(c.req, hdr.ID)
c.meta.Unlock()
}
Req:
switch r := r.(type) {
default:
// Note: To FUSE, ENOSYS means "this server never implements this request."
// It would be inappropriate to return ENOSYS for other operations in this
// switch that might only be unavailable in some contexts, not all.
done(fuse.ENOSYS)
r.RespondError(fuse.ENOSYS)
// FS operations.
case *fuse.InitRequest:
uid = r.Header.Uid
gid = r.Header.Gid
s := &fuse.InitResponse{
MaxWrite: 16*1024,
}
done(s)
r.Respond(s)
case *fuse.StatfsRequest:
// fake it so the other end always thinks we have resources
s := &fuse.StatfsResponse{}
done(s)
r.Respond(s)
// Node operations.
case *fuse.GetattrRequest:
s := &fuse.GetattrResponse{}
s.AttrValid = attrValidTime
a, err := snode.attr()
if err != nil {
done(err)
r.RespondError(err)
break
}
s.Attr = a
done(s)
r.Respond(s)
case *fuse.SetattrRequest:
s := &fuse.SetattrResponse{}
n, ok := node.(NodeSetAttrer)
if !ok {
done(fuse.EPERM)
r.RespondError(fuse.EPERM)
break
}
if err := n.SetAttr(r, intr); err != nil {
done(err)
r.RespondError(err)
break
}
if s.AttrValid == 0 {
s.AttrValid = attrValidTime
}
a, err := snode.attr()
if err != nil {
done(err)
r.RespondError(err)
break
}
s.Attr = a
done(s)
r.Respond(s)
case *fuse.GetxattrRequest:
s := &fuse.GetxattrResponse{}
n, ok := node.(NodeXAttrer)
if !ok || r.Position>0 {
done(fuse.ENODATA)
r.RespondError(fuse.ENODATA)
break
}
v, err := n.Xattr(r.Name)
if err != nil {
done(fuse.ENODATA)
r.RespondError(fuse.ENODATA)
break
}
s.Xattr = v
done(s)
r.Respond(s)
case *fuse.ListxattrRequest:
s := &fuse.ListxattrResponse{}
if n, ok := node.(NodeXAttrer); ok && r.Position==0 {
v := n.Xattrs()
if len(v) > 0 {
s.Append(v...)
}
}
done(s)
r.Respond(s)
case *fuse.SetxattrRequest:
n, ok := node.(NodeXAttrer)
if !ok || r.Position>0 {
done(fuse.EPERM)
r.RespondError(fuse.EPERM)
break
}
err := n.Wxattr(r.Name, r.Xattr)
if err != nil {
done(fuse.EPERM)
r.RespondError(fuse.EPERM)
break
}
done(nil)
r.Respond()
case *fuse.RemovexattrRequest:
n, ok := node.(NodeXAttrer)
if !ok {
done(fuse.ENOTSUP)
r.RespondError(fuse.ENOTSUP)
break
}
err := n.Wxattr(r.Name, nil)
if err != nil {
done(fuse.EPERM)
r.RespondError(fuse.EPERM)
break
}
done(nil)
r.Respond()
case *fuse.SymlinkRequest:
done(fuse.EPERM)
r.RespondError(fuse.EPERM)
case *fuse.ReadlinkRequest:
done(fuse.EPERM)
r.RespondError(fuse.EPERM)
case *fuse.LinkRequest:
done(fuse.EPERM)
r.RespondError(fuse.EPERM)
case *fuse.RemoveRequest:
n, ok := node.(NodeRemover)
if !ok {
done(fuse.EIO) /// XXX or EPERM?
r.RespondError(fuse.EIO)
break
}
err := n.Remove(r.Name, intr)
if err != nil {
done(err)
r.RespondError(err)
break
}
done(nil)
r.Respond()
case *fuse.AccessRequest:
done(nil)
r.Respond()
case *fuse.LookupRequest:
var n2 Node
var err fuse.Error
s := &fuse.LookupResponse{}
if n, ok := node.(NodeLookuper); ok {
n2, err = n.Lookup(r.Name, intr)
} else {
done(fuse.ENOENT)
r.RespondError(fuse.ENOENT)
break
}
if err != nil {
done(err)
r.RespondError(err)
break
}
c.saveLookup(s, snode, r.Name, n2)
done(s)
r.Respond(s)
case *fuse.MkdirRequest:
s := &fuse.MkdirResponse{}
n, ok := node.(NodeMkdirer)
if !ok {
done(fuse.EPERM)
r.RespondError(fuse.EPERM)
break
}
n2, err := n.Mkdir(r.Name, r.Mode, intr)
if err != nil {
done(err)
r.RespondError(err)
break
}
c.saveLookup(&s.LookupResponse, snode, r.Name, n2)
done(s)
r.Respond(s)
case *fuse.OpenRequest:
var h2 Handle
n := node
hh, err := n.Open(r.Flags, intr)
if err != nil {
done(err)
r.RespondError(err)
break
}
h2 = hh
// Using DirectIO requires buffers to be page aligned for exec
// to work on served files.
// But not using DirectIO means that UNIX stats the file and
// then reads the data, which means we can't use it for Ctl files.
flags := fuse.OpenPurgeAttr | fuse.OpenPurgeUBC
if xh, ok := hh.(HandleIsCtler); ok && xh.IsCtl() {
flags = fuse.OpenDirectIO
}
if r.Flags&3==fuse.OpenFlags(os.O_WRONLY) &&
runtime.GOOS=="darwin" {
/*
This is required for append on osx
*/
flags = fuse.OpenPurgeAttr | fuse.OpenPurgeUBC
}
s := &fuse.OpenResponse{Flags: flags}
s.Handle = c.saveHandle(h2, hdr.Node)
done(s)
r.Respond(s)
case *fuse.CreateRequest:
n, ok := node.(NodeCreater)
if !ok {
done(fuse.EPERM)
r.RespondError(fuse.EPERM)
break
}
flags := fuse.OpenPurgeAttr | fuse.OpenPurgeUBC
// flags := fuse.OpenDirectIO
s := &fuse.CreateResponse{OpenResponse: fuse.OpenResponse{Flags: flags}}
n2, h2, err := n.Create(r.Name, r.Flags, r.Mode, intr)
if err != nil {
done(err)
r.RespondError(err)
break
}
c.saveLookup(&s.LookupResponse, snode, r.Name, n2)
s.Handle = c.saveHandle(h2, hdr.Node)
done(s)
r.Respond(s)
case *fuse.ForgetRequest:
forget := c.dropNode(hdr.Node, r.N)
if forget {
n, ok := node.(NodePuter)
if ok {
n.PutNode()
}
}
done(nil)
r.Respond()
// Handle operations.
case *fuse.ReadRequest:
shandle := c.getHandle(r.Handle)
if shandle == nil {
done(fuse.ESTALE)
r.RespondError(fuse.ESTALE)
return
}
handle := shandle.handle
s := &fuse.ReadResponse{Data: make([]byte, 0, r.Size)}
if r.Dir {
h := handle
if shandle.readData == nil {
dirs, err := h.ReadDir(intr)
if err != nil {
done(err)
r.RespondError(err)
break
}
var data []byte
for _, dir := range dirs {
if dir.Inode == 0 {
err := errors.New("bad inode")
done(err)
r.RespondError(err)
break Req
}
data = fuse.AppendDirent(data, dir)
}
shandle.readData = data
}
fuseutil.HandleRead(r, s, shandle.readData)
done(s)
r.Respond(s)
break
}
h := handle
rdata, err := h.Read(r.Offset, r.Size, intr)
if err != nil {
done(err)
r.RespondError(err)
break
}
s.Data = rdata
done(s)
r.Respond(s)
case *fuse.WriteRequest:
shandle := c.getHandle(r.Handle)
if shandle == nil {
done(fuse.ESTALE)
r.RespondError(fuse.ESTALE)
return
}
s := &fuse.WriteResponse{}
if h, ok := shandle.handle.(HandleWriter); ok {
n, err := h.Write(r.Data, r.Offset, intr)
if err != nil {
done(err)
r.RespondError(err)
break
}
s.Size = n
done(s)
r.Respond(s)
break
}
done(fuse.EPERM)
r.RespondError(fuse.EPERM)
case *fuse.FlushRequest:
shandle := c.getHandle(r.Handle)
if shandle == nil {
done(fuse.ESTALE)
r.RespondError(fuse.ESTALE)
return
}
handle := shandle.handle
h := handle
if err := h.Close(intr); err != nil {
done(err)
r.RespondError(err)
break
}
done(nil)
r.Respond()
case *fuse.ReleaseRequest:
shandle := c.getHandle(r.Handle)
if shandle == nil {
done(fuse.ESTALE)
r.RespondError(fuse.ESTALE)
return
}
handle := shandle.handle
// No matter what, release the handle.
c.dropHandle(r.Handle)
if h, ok := handle.(HandlePuter); ok {
h.PutHandle()
}
done(nil)
r.Respond()
case *fuse.DestroyRequest:
done(nil)
r.Respond()
case *fuse.RenameRequest:
c.meta.Lock()
var newDirNode *serveNode
if int(r.NewDir) < len(c.node) {
newDirNode = c.node[r.NewDir]
}
c.meta.Unlock()
if newDirNode == nil {
dprintf("%v\n", renameNewDirNodeNotFound{
Request: r.Hdr(),
In: r,
})
done(fuse.EIO)
r.RespondError(fuse.EIO)
break
}
n, ok := node.(NodeRenamer)
if !ok {
done(fuse.EPERM)
r.RespondError(fuse.EPERM)
break
}
err := n.Rename(r.OldName, r.NewName, newDirNode.node, intr)
if err != nil {
done(err)
r.RespondError(err)
break
}
done(nil)
r.Respond()
case *fuse.MknodRequest:
done(fuse.EIO)
r.RespondError(fuse.EIO)
case *fuse.FsyncRequest:
n, ok := node.(NodeFsyncer)
if !ok {
// if there's no implementation, we pretend it's done.
done(nil)
r.Respond()
break
}
err := n.Fsync(intr)
if err != nil {
done(err)
r.RespondError(err)
break
}
done(nil)
r.Respond()
case *fuse.InterruptRequest:
c.meta.Lock()
ireq := c.req[r.IntrID]
if ireq!=nil && ireq.Intr!=nil {
close(ireq.Intr)
ireq.Intr = nil
}
c.meta.Unlock()
done(nil)
r.Respond()
/* case *FsyncdirRequest:
done(ENOSYS)
r.RespondError(ENOSYS)
case *GetlkRequest, *SetlkRequest, *SetlkwRequest:
done(ENOSYS)
r.RespondError(ENOSYS)
case *BmapRequest:
done(ENOSYS)
r.RespondError(ENOSYS)
case *SetvolnameRequest, *GetxtimesRequest, *ExchangeRequest:
done(ENOSYS)
r.RespondError(ENOSYS)
*/
}
}