func (c *serveConn) serve(fs FS, r fuse.Request) { intr := make(Intr) req := &serveRequest{Request: r, Intr: intr} fuse.Debugf("<- %s", req) 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() println("missing node", id, len(c.node), snode) fuse.Debugf("-> %#x %v", hdr.ID, fuse.ESTALE) 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? 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{}) { fuse.Debugf("-> %#x %v", hdr.ID, resp) c.meta.Lock() c.req[hdr.ID] = nil c.meta.Unlock() } 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: s := &fuse.InitResponse{ MaxWrite: 4096, } if fs, ok := fs.(FSIniter); ok { if err := fs.Init(r, s, intr); err != nil { done(err) r.RespondError(err) break } } done(s) r.Respond(s) case *fuse.StatfsRequest: s := &fuse.StatfsResponse{} if fs, ok := fs.(FSStatfser); ok { if err := fs.Statfs(r, s, intr); err != nil { done(err) r.RespondError(err) break } } done(s) r.Respond(s) // Node operations. case *fuse.GetattrRequest: s := &fuse.GetattrResponse{} if n, ok := node.(NodeGetattrer); ok { if err := n.Getattr(r, s, intr); err != nil { done(err) r.RespondError(err) break } } else { s.AttrValid = 1 * time.Minute s.Attr = snode.attr() } done(s) r.Respond(s) case *fuse.SetattrRequest: s := &fuse.SetattrResponse{} // Special-case truncation, if no other bits are set // and the open Handles all have a WriteAll method. // // TODO WriteAll mishandles all kinds of cases, e.g. // truncating to non-zero size, noncontiguous writes, etc if r.Valid.Size() && r.Size == 0 { type writeAll interface { WriteAll([]byte, Intr) fuse.Error } switch r.Valid { case fuse.SetattrLockOwner | fuse.SetattrSize, fuse.SetattrSize: // Seen on Linux. Handle isn't set. c.meta.Lock() // it is not safe to assume any handles are open for // this node; calls to truncate(2) can happen at any // time if len(c.nodeHandles) > int(hdr.Node) { for hid := range c.nodeHandles[hdr.Node] { shandle := c.handle[hid] if _, ok := shandle.handle.(writeAll); ok { shandle.trunc = true } } } c.meta.Unlock() case fuse.SetattrHandle | fuse.SetattrSize: // Seen on OS X; the Handle is provided. shandle := c.getHandle(r.Handle) if shandle == nil { fuse.Debugf("-> %#x %v", hdr.ID, fuse.ESTALE) r.RespondError(fuse.ESTALE) return } if _, ok := shandle.handle.(writeAll); ok { shandle.trunc = true } } } log.Printf("setattr %v", r) if n, ok := node.(NodeSetattrer); ok { if err := n.Setattr(r, s, intr); err != nil { done(err) r.RespondError(err) break } done(s) r.Respond(s) break } if s.AttrValid == 0 { s.AttrValid = 1 * time.Minute } s.Attr = snode.attr() done(s) r.Respond(s) case *fuse.SymlinkRequest: s := &fuse.SymlinkResponse{} n, ok := node.(NodeSymlinker) if !ok { done(fuse.EIO) // XXX or EPERM like Mkdir? r.RespondError(fuse.EIO) break } n2, err := n.Symlink(r, intr) if err != nil { done(err) r.RespondError(err) break } c.saveLookup(&s.LookupResponse, snode, r.NewName, n2) done(s) r.Respond(s) case *fuse.ReadlinkRequest: n, ok := node.(NodeReadlinker) if !ok { done(fuse.EIO) /// XXX or EPERM? r.RespondError(fuse.EIO) break } target, err := n.Readlink(r, intr) if err != nil { done(err) r.RespondError(err) break } done(target) r.Respond(target) case *fuse.LinkRequest: n, ok := node.(NodeLinker) if !ok { log.Printf("Node %T doesn't implement fuse Link", node) done(fuse.EIO) /// XXX or EPERM? r.RespondError(fuse.EIO) break } c.meta.Lock() var oldNode *serveNode if int(r.OldNode) < len(c.node) { oldNode = c.node[r.OldNode] } c.meta.Unlock() if oldNode == nil { log.Printf("In LinkRequest, node %d not found", r.OldNode) done(fuse.EIO) r.RespondError(fuse.EIO) break } n2, err := n.Link(r, oldNode.node, intr) if err != nil { done(err) r.RespondError(err) break } s := &fuse.LookupResponse{} c.saveLookup(s, snode, r.NewName, n2) done(s) r.Respond(s) case *fuse.RemoveRequest: n, ok := node.(NodeRemover) if !ok { done(fuse.EIO) /// XXX or EPERM? r.RespondError(fuse.EIO) break } err := n.Remove(r, intr) if err != nil { done(err) r.RespondError(err) break } done(nil) r.Respond() case *fuse.AccessRequest: if n, ok := node.(NodeAccesser); ok { if err := n.Access(r, intr); err != nil { done(err) r.RespondError(err) break } } done(r) r.Respond() case *fuse.LookupRequest: var n2 Node var err fuse.Error s := &fuse.LookupResponse{} if n, ok := node.(NodeStringLookuper); ok { n2, err = n.Lookup(r.Name, intr) } else if n, ok := node.(NodeRequestLookuper); ok { n2, err = n.Lookup(r, s, 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, 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: s := &fuse.OpenResponse{Flags: fuse.OpenDirectIO} var h2 Handle if n, ok := node.(NodeOpener); ok { hh, err := n.Open(r, s, intr) if err != nil { done(err) r.RespondError(err) break } h2 = hh } else { h2 = node } s.Handle, _ = c.saveHandle(h2, hdr.Node) done(s) r.Respond(s) case *fuse.CreateRequest: n, ok := node.(NodeCreater) if !ok { // If we send back ENOSYS, FUSE will try mknod+open. done(fuse.EPERM) r.RespondError(fuse.EPERM) break } s := &fuse.CreateResponse{OpenResponse: fuse.OpenResponse{Flags: fuse.OpenDirectIO}} n2, h2, err := n.Create(r, s, intr) if err != nil { done(err) r.RespondError(err) break } c.saveLookup(&s.LookupResponse, snode, r.Name, n2) h, shandle := c.saveHandle(h2, hdr.Node) s.Handle = h type writeAll interface { WriteAll([]byte, Intr) fuse.Error } if _, ok := shandle.handle.(writeAll); ok { shandle.trunc = true } done(s) r.Respond(s) case *fuse.GetxattrRequest, *fuse.SetxattrRequest, *fuse.ListxattrRequest, *fuse.RemovexattrRequest: // TODO: Use n. done(fuse.ENOSYS) r.RespondError(fuse.ENOSYS) case *fuse.ForgetRequest: n, ok := node.(NodeForgetter) if ok { n.Forget() } c.dropNode(hdr.Node) done(r) r.Respond() // Handle operations. case *fuse.ReadRequest: shandle := c.getHandle(r.Handle) if shandle == nil { fuse.Debugf("-> %#x %v", hdr.ID, fuse.ESTALE) r.RespondError(fuse.ESTALE) return } handle := shandle.handle s := &fuse.ReadResponse{Data: make([]byte, 0, r.Size)} if r.Dir { if h, ok := handle.(HandleReadDirer); ok { 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 { dir.Inode = hash(path.Join(snode.name, dir.Name)) } data = fuse.AppendDirent(data, dir) } shandle.readData = data } fuseutil.HandleRead(r, s, shandle.readData) done(s) r.Respond(s) break } } else { if h, ok := handle.(HandleReadAller); ok { if shandle.readData == nil { data, err := h.ReadAll(intr) if err != nil { done(err) r.RespondError(err) break } if data == nil { data = []byte{} } shandle.readData = data } fuseutil.HandleRead(r, s, shandle.readData) done(s) r.Respond(s) break } h, ok := handle.(HandleReader) if !ok { fmt.Printf("NO READ FOR %T\n", handle) done(fuse.EIO) r.RespondError(fuse.EIO) break } if err := h.Read(r, s, intr); err != nil { done(err) r.RespondError(err) break } } done(s) r.Respond(s) case *fuse.WriteRequest: shandle := c.getHandle(r.Handle) if shandle == nil { fuse.Debugf("-> %#x %v", hdr.ID, fuse.ESTALE) r.RespondError(fuse.ESTALE) return } s := &fuse.WriteResponse{} if shandle.trunc && r.Offset == int64(len(shandle.writeData)) { shandle.writeData = append(shandle.writeData, r.Data...) s.Size = len(r.Data) done(s) r.Respond(s) break } if h, ok := shandle.handle.(HandleWriter); ok { if err := h.Write(r, s, intr); err != nil { done(err) r.RespondError(err) break } done(s) r.Respond(s) break } println("NO WRITE") done(fuse.EIO) r.RespondError(fuse.EIO) case *fuse.FlushRequest: shandle := c.getHandle(r.Handle) if shandle == nil { fuse.Debugf("-> %#x %v", hdr.ID, fuse.ESTALE) r.RespondError(fuse.ESTALE) return } handle := shandle.handle if shandle.trunc { h := handle.(HandleWriteAller) if err := h.WriteAll(shandle.writeData, intr); err != nil { done(err) r.RespondError(err) break } shandle.writeData = nil shandle.trunc = false } if h, ok := handle.(HandleFlusher); ok { if err := h.Flush(r, intr); err != nil { done(err) r.RespondError(err) break } } done(nil) r.Respond() case *fuse.ReleaseRequest: shandle := c.getHandle(r.Handle) if shandle == nil { fuse.Debugf("-> %#x %v", hdr.ID, fuse.ESTALE) r.RespondError(fuse.ESTALE) return } handle := shandle.handle // No matter what, release the handle. c.dropHandle(r.Handle) if h, ok := handle.(HandleReleaser); ok { if err := h.Release(r, intr); err != nil { done(err) r.RespondError(err) break } } done(nil) r.Respond() case *fuse.DestroyRequest: if fs, ok := fs.(FSDestroyer); ok { fs.Destroy() } 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 { println("RENAME NEW DIR NODE NOT FOUND") done(fuse.EIO) r.RespondError(fuse.EIO) break } n, ok := node.(NodeRenamer) if !ok { log.Printf("Node %T missing Rename method", node) done(fuse.EIO) // XXX or EPERM like Mkdir? r.RespondError(fuse.EIO) break } err := n.Rename(r, newDirNode.node, intr) if err != nil { done(err) r.RespondError(err) break } done(nil) r.Respond() case *fuse.MknodRequest: n, ok := node.(NodeMknoder) if !ok { log.Printf("Node %T missing Mknod method", node) done(fuse.EIO) r.RespondError(fuse.EIO) break } n2, err := n.Mknod(r, intr) if err != nil { done(err) r.RespondError(err) break } s := &fuse.LookupResponse{} c.saveLookup(s, snode, r.Name, n2) done(s) r.Respond(s) case *fuse.FsyncRequest: n, ok := node.(NodeFsyncer) if !ok { log.Printf("Node %T missing Fsync method", node) done(fuse.EIO) r.RespondError(fuse.EIO) break } err := n.Fsync(r, 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) */ } }
func (c *serveConn) serve(r fuse.Request) { intr := make(Intr) req := &serveRequest{Request: r, Intr: intr} c.debug(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() c.debug(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 } c.debug(msg) c.meta.Lock() delete(c.req, hdr.ID) c.meta.Unlock() } 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: s := &fuse.InitResponse{ MaxWrite: 128 * 1024, Flags: fuse.InitBigWrites, } if fs, ok := c.fs.(FSIniter); ok { if err := fs.Init(r, s, intr); err != nil { done(err) r.RespondError(err) break } } done(s) r.Respond(s) case *fuse.StatfsRequest: s := &fuse.StatfsResponse{} if fs, ok := c.fs.(FSStatfser); ok { if err := fs.Statfs(r, s, intr); err != nil { done(err) r.RespondError(err) break } } done(s) r.Respond(s) // Node operations. case *fuse.GetattrRequest: s := &fuse.GetattrResponse{} if n, ok := node.(NodeGetattrer); ok { if err := n.Getattr(r, s, intr); err != nil { done(err) r.RespondError(err) break } } else { s.AttrValid = attrValidTime s.Attr = snode.attr() } done(s) r.Respond(s) case *fuse.SetattrRequest: s := &fuse.SetattrResponse{} if n, ok := node.(NodeSetattrer); ok { if err := n.Setattr(r, s, intr); err != nil { done(err) r.RespondError(err) break } done(s) r.Respond(s) break } if s.AttrValid == 0 { s.AttrValid = attrValidTime } s.Attr = snode.attr() done(s) r.Respond(s) case *fuse.SymlinkRequest: s := &fuse.SymlinkResponse{} n, ok := node.(NodeSymlinker) if !ok { done(fuse.EIO) // XXX or EPERM like Mkdir? r.RespondError(fuse.EIO) break } n2, err := n.Symlink(r, intr) if err != nil { done(err) r.RespondError(err) break } c.saveLookup(&s.LookupResponse, snode, r.NewName, n2) done(s) r.Respond(s) case *fuse.ReadlinkRequest: n, ok := node.(NodeReadlinker) if !ok { done(fuse.EIO) /// XXX or EPERM? r.RespondError(fuse.EIO) break } target, err := n.Readlink(r, intr) if err != nil { done(err) r.RespondError(err) break } done(target) r.Respond(target) case *fuse.LinkRequest: n, ok := node.(NodeLinker) if !ok { done(fuse.EIO) /// XXX or EPERM? r.RespondError(fuse.EIO) break } c.meta.Lock() var oldNode *serveNode if int(r.OldNode) < len(c.node) { oldNode = c.node[r.OldNode] } c.meta.Unlock() if oldNode == nil { c.debug(logLinkRequestOldNodeNotFound{ Request: r.Hdr(), In: r, }) done(fuse.EIO) r.RespondError(fuse.EIO) break } n2, err := n.Link(r, oldNode.node, intr) if err != nil { done(err) r.RespondError(err) break } s := &fuse.LookupResponse{} c.saveLookup(s, snode, r.NewName, n2) done(s) r.Respond(s) case *fuse.RemoveRequest: n, ok := node.(NodeRemover) if !ok { done(fuse.EIO) /// XXX or EPERM? r.RespondError(fuse.EIO) break } err := n.Remove(r, intr) if err != nil { done(err) r.RespondError(err) break } done(nil) r.Respond() case *fuse.AccessRequest: if n, ok := node.(NodeAccesser); ok { if err := n.Access(r, intr); err != nil { done(err) r.RespondError(err) break } } done(nil) r.Respond() case *fuse.LookupRequest: var n2 Node var err fuse.Error s := &fuse.LookupResponse{} if n, ok := node.(NodeStringLookuper); ok { n2, err = n.Lookup(r.Name, intr) } else if n, ok := node.(NodeRequestLookuper); ok { n2, err = n.Lookup(r, s, 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, 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: s := &fuse.OpenResponse{} var h2 Handle if n, ok := node.(NodeOpener); ok { hh, err := n.Open(r, s, intr) if err != nil { done(err) r.RespondError(err) break } h2 = hh } else { h2 = node } s.Handle = c.saveHandle(h2, hdr.Node) done(s) r.Respond(s) case *fuse.CreateRequest: n, ok := node.(NodeCreater) if !ok { // If we send back ENOSYS, FUSE will try mknod+open. done(fuse.EPERM) r.RespondError(fuse.EPERM) break } s := &fuse.CreateResponse{OpenResponse: fuse.OpenResponse{}} n2, h2, err := n.Create(r, s, 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.GetxattrRequest: n, ok := node.(NodeGetxattrer) if !ok { done(fuse.ENOTSUP) r.RespondError(fuse.ENOTSUP) break } s := &fuse.GetxattrResponse{} err := n.Getxattr(r, s, intr) if err != nil { done(err) r.RespondError(err) break } if r.Size != 0 && uint64(len(s.Xattr)) > uint64(r.Size) { done(fuse.ERANGE) r.RespondError(fuse.ERANGE) break } done(s) r.Respond(s) case *fuse.ListxattrRequest: n, ok := node.(NodeListxattrer) if !ok { done(fuse.ENOTSUP) r.RespondError(fuse.ENOTSUP) break } s := &fuse.ListxattrResponse{} err := n.Listxattr(r, s, intr) if err != nil { done(err) r.RespondError(err) break } if r.Size != 0 && uint64(len(s.Xattr)) > uint64(r.Size) { done(fuse.ERANGE) r.RespondError(fuse.ERANGE) break } done(s) r.Respond(s) case *fuse.SetxattrRequest: n, ok := node.(NodeSetxattrer) if !ok { done(fuse.ENOTSUP) r.RespondError(fuse.ENOTSUP) break } err := n.Setxattr(r, intr) if err != nil { done(err) r.RespondError(err) break } done(nil) r.Respond() case *fuse.RemovexattrRequest: n, ok := node.(NodeRemovexattrer) if !ok { done(fuse.ENOTSUP) r.RespondError(fuse.ENOTSUP) break } err := n.Removexattr(r, intr) if err != nil { done(err) r.RespondError(err) break } done(nil) r.Respond() case *fuse.ForgetRequest: forget := c.dropNode(hdr.Node, r.N) if forget { n, ok := node.(NodeForgetter) if ok { n.Forget() } } 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 { if h, ok := handle.(HandleReadDirer); ok { 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 { dir.Inode = c.dynamicInode(snode.inode, dir.Name) } data = fuse.AppendDirent(data, dir) } shandle.readData = data } fuseutil.HandleRead(r, s, shandle.readData) done(s) r.Respond(s) break } } else { if h, ok := handle.(HandleReadAller); ok { if shandle.readData == nil { data, err := h.ReadAll(intr) if err != nil { done(err) r.RespondError(err) break } if data == nil { data = []byte{} } shandle.readData = data } fuseutil.HandleRead(r, s, shandle.readData) done(s) r.Respond(s) break } h, ok := handle.(HandleReader) if !ok { fmt.Printf("NO READ FOR %T\n", handle) done(fuse.EIO) r.RespondError(fuse.EIO) break } if err := h.Read(r, s, intr); err != nil { done(err) r.RespondError(err) break } } 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 { if err := h.Write(r, s, intr); err != nil { done(err) r.RespondError(err) break } done(s) r.Respond(s) break } done(fuse.EIO) r.RespondError(fuse.EIO) case *fuse.FlushRequest: shandle := c.getHandle(r.Handle) if shandle == nil { done(fuse.ESTALE) r.RespondError(fuse.ESTALE) return } handle := shandle.handle if h, ok := handle.(HandleFlusher); ok { if err := h.Flush(r, 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.(HandleReleaser); ok { if err := h.Release(r, intr); err != nil { done(err) r.RespondError(err) break } } done(nil) r.Respond() case *fuse.DestroyRequest: if fs, ok := c.fs.(FSDestroyer); ok { fs.Destroy() } 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 { c.debug(renameNewDirNodeNotFound{ Request: r.Hdr(), In: r, }) done(fuse.EIO) r.RespondError(fuse.EIO) break } n, ok := node.(NodeRenamer) if !ok { done(fuse.EIO) // XXX or EPERM like Mkdir? r.RespondError(fuse.EIO) break } err := n.Rename(r, newDirNode.node, intr) if err != nil { done(err) r.RespondError(err) break } done(nil) r.Respond() case *fuse.MknodRequest: n, ok := node.(NodeMknoder) if !ok { done(fuse.EIO) r.RespondError(fuse.EIO) break } n2, err := n.Mknod(r, intr) if err != nil { done(err) r.RespondError(err) break } s := &fuse.LookupResponse{} c.saveLookup(s, snode, r.Name, n2) done(s) r.Respond(s) case *fuse.FsyncRequest: n, ok := node.(NodeFsyncer) if !ok { done(fuse.EIO) r.RespondError(fuse.EIO) break } err := n.Fsync(r, 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) */ } }
// Record a fuse.Request, after zeroing header fields that are hard to // reproduce. // // Make sure to record a copy, not the original request. func (r *RequestRecorder) RecordRequest(req fuse.Request) { hdr := req.Hdr() *hdr = fuse.Header{} r.rec.Record(req) }
// handleRequest will either a) call done(s) and r.Respond(s) OR b) return an error. func (c *Server) handleRequest(ctx context.Context, node Node, snode *serveNode, r fuse.Request, done func(resp interface{})) error { 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. return fuse.ENOSYS case *fuse.StatfsRequest: s := &fuse.StatfsResponse{} if fs, ok := c.fs.(FSStatfser); ok { if err := fs.Statfs(ctx, r, s); err != nil { return err } } done(s) r.Respond(s) return nil // Node operations. case *fuse.GetattrRequest: s := &fuse.GetattrResponse{} if n, ok := node.(NodeGetattrer); ok { if err := n.Getattr(ctx, r, s); err != nil { return err } } else { if err := snode.attr(ctx, &s.Attr); err != nil { return err } } done(s) r.Respond(s) return nil case *fuse.SetattrRequest: s := &fuse.SetattrResponse{} if n, ok := node.(NodeSetattrer); ok { if err := n.Setattr(ctx, r, s); err != nil { return err } } if err := snode.attr(ctx, &s.Attr); err != nil { return err } done(s) r.Respond(s) return nil case *fuse.SymlinkRequest: s := &fuse.SymlinkResponse{} initLookupResponse(&s.LookupResponse) n, ok := node.(NodeSymlinker) if !ok { return fuse.EIO // XXX or EPERM like Mkdir? } n2, err := n.Symlink(ctx, r) if err != nil { return err } if err := c.saveLookup(ctx, &s.LookupResponse, snode, r.NewName, n2); err != nil { return err } done(s) r.Respond(s) return nil case *fuse.ReadlinkRequest: n, ok := node.(NodeReadlinker) if !ok { return fuse.EIO /// XXX or EPERM? } target, err := n.Readlink(ctx, r) if err != nil { return err } done(target) r.Respond(target) return nil case *fuse.LinkRequest: n, ok := node.(NodeLinker) if !ok { return fuse.EIO /// XXX or EPERM? } c.meta.Lock() var oldNode *serveNode if int(r.OldNode) < len(c.node) { oldNode = c.node[r.OldNode] } c.meta.Unlock() if oldNode == nil { c.debug(logLinkRequestOldNodeNotFound{ Request: r.Hdr(), In: r, }) return fuse.EIO } n2, err := n.Link(ctx, r, oldNode.node) if err != nil { return err } s := &fuse.LookupResponse{} initLookupResponse(s) if err := c.saveLookup(ctx, s, snode, r.NewName, n2); err != nil { return err } done(s) r.Respond(s) return nil case *fuse.RemoveRequest: n, ok := node.(NodeRemover) if !ok { return fuse.EIO /// XXX or EPERM? } err := n.Remove(ctx, r) if err != nil { return err } done(nil) r.Respond() return nil case *fuse.AccessRequest: if n, ok := node.(NodeAccesser); ok { if err := n.Access(ctx, r); err != nil { return err } } done(nil) r.Respond() return nil case *fuse.LookupRequest: var n2 Node var err error s := &fuse.LookupResponse{} initLookupResponse(s) if n, ok := node.(NodeStringLookuper); ok { n2, err = n.Lookup(ctx, r.Name) } else if n, ok := node.(NodeRequestLookuper); ok { n2, err = n.Lookup(ctx, r, s) } else { return fuse.ENOENT } if err != nil { return err } if err := c.saveLookup(ctx, s, snode, r.Name, n2); err != nil { return err } done(s) r.Respond(s) return nil case *fuse.MkdirRequest: s := &fuse.MkdirResponse{} initLookupResponse(&s.LookupResponse) n, ok := node.(NodeMkdirer) if !ok { return fuse.EPERM } n2, err := n.Mkdir(ctx, r) if err != nil { return err } if err := c.saveLookup(ctx, &s.LookupResponse, snode, r.Name, n2); err != nil { return err } done(s) r.Respond(s) return nil case *fuse.OpenRequest: s := &fuse.OpenResponse{} var h2 Handle if n, ok := node.(NodeOpener); ok { hh, err := n.Open(ctx, r, s) if err != nil { return err } h2 = hh } else { h2 = node } s.Handle = c.saveHandle(h2, r.Hdr().Node) done(s) r.Respond(s) return nil case *fuse.CreateRequest: n, ok := node.(NodeCreater) if !ok { // If we send back ENOSYS, FUSE will try mknod+open. return fuse.EPERM } s := &fuse.CreateResponse{OpenResponse: fuse.OpenResponse{}} initLookupResponse(&s.LookupResponse) n2, h2, err := n.Create(ctx, r, s) if err != nil { return err } if err := c.saveLookup(ctx, &s.LookupResponse, snode, r.Name, n2); err != nil { return err } s.Handle = c.saveHandle(h2, r.Hdr().Node) done(s) r.Respond(s) return nil case *fuse.GetxattrRequest: n, ok := node.(NodeGetxattrer) if !ok { return fuse.ENOTSUP } s := &fuse.GetxattrResponse{} err := n.Getxattr(ctx, r, s) if err != nil { return err } if r.Size != 0 && uint64(len(s.Xattr)) > uint64(r.Size) { return fuse.ERANGE } done(s) r.Respond(s) return nil case *fuse.ListxattrRequest: n, ok := node.(NodeListxattrer) if !ok { return fuse.ENOTSUP } s := &fuse.ListxattrResponse{} err := n.Listxattr(ctx, r, s) if err != nil { return err } if r.Size != 0 && uint64(len(s.Xattr)) > uint64(r.Size) { return fuse.ERANGE } done(s) r.Respond(s) return nil case *fuse.SetxattrRequest: n, ok := node.(NodeSetxattrer) if !ok { return fuse.ENOTSUP } err := n.Setxattr(ctx, r) if err != nil { return err } done(nil) r.Respond() return nil case *fuse.RemovexattrRequest: n, ok := node.(NodeRemovexattrer) if !ok { return fuse.ENOTSUP } err := n.Removexattr(ctx, r) if err != nil { return err } done(nil) r.Respond() return nil case *fuse.ForgetRequest: forget := c.dropNode(r.Hdr().Node, r.N) if forget { n, ok := node.(NodeForgetter) if ok { n.Forget() } } done(nil) r.Respond() return nil // Handle operations. case *fuse.ReadRequest: shandle := c.getHandle(r.Handle) if shandle == nil { return fuse.ESTALE } handle := shandle.handle s := &fuse.ReadResponse{Data: make([]byte, 0, r.Size)} if r.Dir { if h, ok := handle.(HandleReadDirAller); ok { // detect rewinddir(3) or similar seek and refresh // contents if r.Offset == 0 { shandle.readData = nil } if shandle.readData == nil { dirs, err := h.ReadDirAll(ctx) if err != nil { return err } var data []byte for _, dir := range dirs { if dir.Inode == 0 { dir.Inode = c.dynamicInode(snode.inode, dir.Name) } data = fuse.AppendDirent(data, dir) } shandle.readData = data } fuseutil.HandleRead(r, s, shandle.readData) done(s) r.Respond(s) return nil } } else { if h, ok := handle.(HandleReadAller); ok { if shandle.readData == nil { data, err := h.ReadAll(ctx) if err != nil { return err } if data == nil { data = []byte{} } shandle.readData = data } fuseutil.HandleRead(r, s, shandle.readData) done(s) r.Respond(s) return nil } h, ok := handle.(HandleReader) if !ok { err := handleNotReaderError{handle: handle} return err } if err := h.Read(ctx, r, s); err != nil { return err } } done(s) r.Respond(s) return nil case *fuse.WriteRequest: shandle := c.getHandle(r.Handle) if shandle == nil { return fuse.ESTALE } s := &fuse.WriteResponse{} if h, ok := shandle.handle.(HandleWriter); ok { if err := h.Write(ctx, r, s); err != nil { return err } done(s) r.Respond(s) return nil } return fuse.EIO case *fuse.FlushRequest: shandle := c.getHandle(r.Handle) if shandle == nil { return fuse.ESTALE } handle := shandle.handle if h, ok := handle.(HandleFlusher); ok { if err := h.Flush(ctx, r); err != nil { return err } } done(nil) r.Respond() return nil case *fuse.ReleaseRequest: shandle := c.getHandle(r.Handle) if shandle == nil { return fuse.ESTALE } handle := shandle.handle // No matter what, release the handle. c.dropHandle(r.Handle) if h, ok := handle.(HandleReleaser); ok { if err := h.Release(ctx, r); err != nil { return err } } done(nil) r.Respond() return nil case *fuse.DestroyRequest: if fs, ok := c.fs.(FSDestroyer); ok { fs.Destroy() } done(nil) r.Respond() return nil 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 { c.debug(renameNewDirNodeNotFound{ Request: r.Hdr(), In: r, }) return fuse.EIO } n, ok := node.(NodeRenamer) if !ok { return fuse.EIO // XXX or EPERM like Mkdir? } err := n.Rename(ctx, r, newDirNode.node) if err != nil { return err } done(nil) r.Respond() return nil case *fuse.MknodRequest: n, ok := node.(NodeMknoder) if !ok { return fuse.EIO } n2, err := n.Mknod(ctx, r) if err != nil { return err } s := &fuse.LookupResponse{} initLookupResponse(s) if err := c.saveLookup(ctx, s, snode, r.Name, n2); err != nil { return err } done(s) r.Respond(s) return nil case *fuse.FsyncRequest: n, ok := node.(NodeFsyncer) if !ok { return fuse.EIO } err := n.Fsync(ctx, r) if err != nil { return err } done(nil) r.Respond() return nil case *fuse.InterruptRequest: c.meta.Lock() ireq := c.req[r.IntrID] if ireq != nil && ireq.cancel != nil { ireq.cancel() ireq.cancel = nil } c.meta.Unlock() done(nil) r.Respond() return nil /* case *FsyncdirRequest: return ENOSYS case *GetlkRequest, *SetlkRequest, *SetlkwRequest: return ENOSYS case *BmapRequest: return ENOSYS case *SetvolnameRequest, *GetxtimesRequest, *ExchangeRequest: return ENOSYS */ } panic("not reached") }
func (c *Server) serve(r fuse.Request) { ctx, cancel := context.WithCancel(context.Background()) defer cancel() parentCtx := ctx if c.context != nil { ctx = c.context(ctx, r) } req := &serveRequest{Request: r, cancel: cancel} c.debug(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() c.debug(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 } 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 } c.debug(msg) c.meta.Lock() delete(c.req, hdr.ID) c.meta.Unlock() } var responded bool defer func() { if rec := recover(); rec != nil { const size = 1 << 16 buf := make([]byte, size) n := runtime.Stack(buf, false) buf = buf[:n] log.Printf("fuse: panic in handler for %v: %v\n%s", r, rec, buf) err := handlerPanickedError{ Request: r, Err: rec, } done(err) r.RespondError(err) return } if !responded { err := handlerTerminatedError{ Request: r, } done(err) r.RespondError(err) } }() if err := c.handleRequest(ctx, node, snode, r, done); err != nil { if err == context.Canceled { select { case <-parentCtx.Done(): // We canceled the parent context because of an // incoming interrupt request, so return EINTR // to trigger the right behavior in the client app. // // Only do this when it's the parent context that was // canceled, not a context controlled by the program // using this library, so we don't return EINTR too // eagerly -- it might cause busy loops. // // Decent write-up on role of EINTR: // http://250bpm.com/blog:12 err = fuse.EINTR default: // nothing } } done(err) r.RespondError(err) } // disarm runtime.Goexit protection responded = true }
func (sc *serveConn) serve(req fuse.Request) { switch req := req.(type) { default: // ENOSYS means "this server never implements this request." //done(fuse.ENOSYS) fuse.Debug(fmt.Sprintf("ENOSYS: %+v", req)) req.RespondError(fuse.ENOSYS) case *fuse.InitRequest: resp := fuse.InitResponse{MaxWrite: 128 * 1024, Flags: fuse.InitBigWrites & fuse.InitAsyncRead, } req.Respond(&resp) case *fuse.StatfsRequest: var numfiles uint64 if f, err := sc.db.AllFileIds(); err != nil { numfiles = uint64(len(f)) } req.Respond( &fuse.StatfsResponse{ Files: numfiles, Bsize: blockSize, }, ) case *fuse.GetattrRequest: sc.getattr(req) case *fuse.LookupRequest: sc.lookup(req) // Ack that the kernel has forgotten the metadata about an inode case *fuse.ForgetRequest: req.Respond() // Hand back the inode as the HandleID case *fuse.OpenRequest: sc.open(req) // Silently ignore attempts to change permissions case *fuse.SetattrRequest: inode := uint64(req.Header.Node) f, err := sc.db.FileByInode(inode) if err != nil { fuse.Debug(fmt.Sprintf("FileByInode(%v): %v", inode, err)) req.RespondError(fuse.EIO) return } req.Respond(&fuse.SetattrResponse{Attr: sc.attrFromFile(*f)}) case *fuse.CreateRequest: // TODO: if allow_other, require uid == invoking uid to allow writes sc.create(req) // Return Dirents for directories, or requested portion of file case *fuse.ReadRequest: if req.Dir { sc.readDir(req) } else { sc.read(req) } // Return MkdirResponse (it's LookupResponse, essentially) of new dir case *fuse.MkdirRequest: sc.mkdir(req) // Removes the inode described by req.Header.Node // Respond() for success, RespondError otherwise case *fuse.RemoveRequest: sc.remove(req) // req.Header.Node describes the current parent directory // req.NewDir describes the target directory (may be the same) // req.OldName and req.NewName describe any (or no) change in name case *fuse.RenameRequest: sc.rename(req) // Responds with the number of bytes written on success, RespondError otherwise case *fuse.WriteRequest: sc.write(req) // Ack that the kernel has forgotten the metadata about an inode case *fuse.FlushRequest: req.Respond() // Ack release of the kernel's mapping an inode->fileId case *fuse.ReleaseRequest: sc.release(req) case *fuse.DestroyRequest: req.Respond() } }
// Handle fuse request func (f *fs) handle(r fuse.Request) { switch r := r.(type) { default: log.Printf("Unhandled request: %v", r) r.RespondError(fuse.ENOSYS) case *fuse.GetattrRequest: f.handleGetattr(r) case *fuse.LookupRequest: f.handleLookup(r) case *fuse.MkdirRequest: f.handleMkdir(r) case *fuse.OpenRequest: f.handleOpen(r) case *fuse.ReadRequest: f.handleRead(r) case *fuse.WriteRequest: f.handleWrite(r) case *fuse.CreateRequest: f.handleCreate(r) case *fuse.SetattrRequest: f.handleSetattr(r) case *fuse.ReleaseRequest: f.handleRelease(r) case *fuse.FlushRequest: f.handleFlush(r) case *fuse.InterruptRequest: f.handleInterrupt(r) case *fuse.ForgetRequest: f.handleForget(r) case *fuse.RemoveRequest: f.handleRemove(r) case *fuse.AccessRequest: f.handleAccess(r) case *fuse.SymlinkRequest: f.handleSymlink(r) case *fuse.ReadlinkRequest: f.handleReadlink(r) case *fuse.GetxattrRequest: f.handleGetxattr(r) case *fuse.ListxattrRequest: f.handleListxattr(r) case *fuse.SetxattrRequest: f.handleSetxattr(r) case *fuse.RemovexattrRequest: f.handleRemovexattr(r) case *fuse.RenameRequest: f.handleRename(r) case *fuse.StatfsRequest: f.handleStatfs(r) /* case *fuse.InitRequest: f.handleInit(r) case *fuse.MknodRequest: f.handleMknod(r) case *fuse.LinkRequest: f.handleLink(r) case *fuse.DestroyRequest: f.handleDestroy(r) case *fuse.FsyncRequest: f.handleFsync(r) */ } }