Refactored kernelResponse methods into a single big function.
Aaron Jacobs
parent
35d5c4c3fe
commit
a7bcfed288
462
ops.go
462
ops.go
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@ -15,7 +15,7 @@
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package fuse
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import (
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"fmt"
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"syscall"
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"unsafe"
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"github.com/jacobsa/fuse/fuseops"
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@ -23,352 +23,126 @@ import (
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"github.com/jacobsa/fuse/internal/fusekernel"
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)
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type opCommon struct {
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}
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// Given an op, return the response that should be sent to the kernel. If the
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// op requires no response, return a nil response. If the op is unknown, return
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// an error that should be sent to the kernel.
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func kernelResponse(
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untyped fuseops.Op,
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protocol fusekernel.Protocol) (b buffer.OutMessage, err error) {
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switch o := untyped.(type) {
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case *fuseops.LookUpInodeOp:
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size := fusekernel.EntryOutSize(protocol)
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b = buffer.NewOutMessage(size)
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out := (*fusekernel.EntryOut)(b.Grow(size))
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convertChildInodeEntry(&o.wrapped.Entry, out)
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////////////////////////////////////////////////////////////////////////
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// Inodes
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////////////////////////////////////////////////////////////////////////
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case *fuseops.GetInodeAttributesOp:
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size := fusekernel.AttrOutSize(o.protocol)
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b = buffer.NewOutMessage(size)
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out := (*fusekernel.AttrOut)(b.Grow(size))
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out.AttrValid, out.AttrValidNsec = convertExpirationTime(o.AttributesExpiration)
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convertAttributes(o.Inode, &o.Attributes, &out.Attr)
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type lookUpInodeOp struct {
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opCommon
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wrapped fuseops.LookUpInodeOp
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}
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case *fuseops.SetInodeAttributesOp:
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size := fusekernel.AttrOutSize(o.protocol)
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b = buffer.NewOutMessage(size)
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out := (*fusekernel.AttrOut)(b.Grow(size))
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out.AttrValid, out.AttrValidNsec = convertExpirationTime(o.AttributesExpiration)
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convertAttributes(o.Inode, &o.Attributes, &out.Attr)
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func (o *lookUpInodeOp) kernelResponse(
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protocol fusekernel.Protocol) (b buffer.OutMessage) {
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size := fusekernel.EntryOutSize(protocol)
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b = buffer.NewOutMessage(size)
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out := (*fusekernel.EntryOut)(b.Grow(size))
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convertChildInodeEntry(&o.wrapped.Entry, out)
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return
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}
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type getInodeAttributesOp struct {
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opCommon
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wrapped fuseops.GetInodeAttributesOp
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}
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func (o *getInodeAttributesOp) kernelResponse() (b buffer.OutMessage) {
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size := fusekernel.AttrOutSize(o.protocol)
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b = buffer.NewOutMessage(size)
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out := (*fusekernel.AttrOut)(b.Grow(size))
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out.AttrValid, out.AttrValidNsec = convertExpirationTime(o.AttributesExpiration)
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convertAttributes(o.Inode, &o.Attributes, &out.Attr)
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return
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}
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type setInodeAttributesOp struct {
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opCommon
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wrapped fuseops.SetInodeAttributesOp
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}
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func (o *setInodeAttributesOp) kernelResponse() (b buffer.OutMessage) {
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size := fusekernel.AttrOutSize(o.protocol)
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b = buffer.NewOutMessage(size)
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out := (*fusekernel.AttrOut)(b.Grow(size))
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out.AttrValid, out.AttrValidNsec = convertExpirationTime(o.AttributesExpiration)
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convertAttributes(o.Inode, &o.Attributes, &out.Attr)
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return
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}
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type forgetInodeOp struct {
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opCommon
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wrapped fuseops.ForgetInodeOp
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}
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func (o *forgetInodeOp) kernelResponse() (b buffer.OutMessage) {
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// No response.
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return
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}
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////////////////////////////////////////////////////////////////////////
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// Inode creation
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////////////////////////////////////////////////////////////////////////
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type mkDirOp struct {
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opCommon
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wrapped fuseops.MkDirOp
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}
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func (o *mkDirOp) kernelResponse() (b buffer.OutMessage) {
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size := fusekernel.EntryOutSize(o.protocol)
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b = buffer.NewOutMessage(size)
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out := (*fusekernel.EntryOut)(b.Grow(size))
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convertChildInodeEntry(&o.Entry, out)
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return
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}
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type createFileOp struct {
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opCommon
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wrapped fuseops.CreateFileOp
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}
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func (o *createFileOp) kernelResponse() (b buffer.OutMessage) {
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eSize := fusekernel.EntryOutSize(o.protocol)
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b = buffer.NewOutMessage(eSize + unsafe.Sizeof(fusekernel.OpenOut{}))
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e := (*fusekernel.EntryOut)(b.Grow(eSize))
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convertChildInodeEntry(&o.Entry, e)
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oo := (*fusekernel.OpenOut)(b.Grow(unsafe.Sizeof(fusekernel.OpenOut{})))
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oo.Fh = uint64(o.Handle)
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return
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}
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type createSymlinkOp struct {
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opCommon
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wrapped fuseops.CreateSymlinkOp
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}
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func (o *createSymlinkOp) kernelResponse() (b buffer.OutMessage) {
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size := fusekernel.EntryOutSize(o.protocol)
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b = buffer.NewOutMessage(size)
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out := (*fusekernel.EntryOut)(b.Grow(size))
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convertChildInodeEntry(&o.Entry, out)
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return
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}
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////////////////////////////////////////////////////////////////////////
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// Unlinking
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////////////////////////////////////////////////////////////////////////
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type renameOp struct {
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opCommon
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wrapped fuseops.RenameOp
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}
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func (o *renameOp) kernelResponse() (b buffer.OutMessage) {
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b = buffer.NewOutMessage(0)
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return
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}
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type rmDirOp struct {
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opCommon
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wrapped fuseops.RmDirOp
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}
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func (o *rmDirOp) kernelResponse() (b buffer.OutMessage) {
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b = buffer.NewOutMessage(0)
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return
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}
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type unlinkOp struct {
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opCommon
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wrapped fuseops.UnlinkOp
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}
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func (o *unlinkOp) kernelResponse() (b buffer.OutMessage) {
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b = buffer.NewOutMessage(0)
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return
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}
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////////////////////////////////////////////////////////////////////////
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// Directory handles
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////////////////////////////////////////////////////////////////////////
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type openDirOp struct {
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opCommon
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wrapped fuseops.OpenDirOp
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}
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func (o *openDirOp) kernelResponse() (b buffer.OutMessage) {
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b = buffer.NewOutMessage(unsafe.Sizeof(fusekernel.OpenOut{}))
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out := (*fusekernel.OpenOut)(b.Grow(unsafe.Sizeof(fusekernel.OpenOut{})))
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out.Fh = uint64(o.Handle)
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return
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}
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type readDirOp struct {
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opCommon
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wrapped fuseops.ReadDirOp
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}
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func (o *readDirOp) kernelResponse() (b buffer.OutMessage) {
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b = buffer.NewOutMessage(uintptr(len(o.Data)))
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b.Append(o.Data)
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return
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}
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type releaseDirHandleOp struct {
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opCommon
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wrapped fuseops.ReleaseDirHandleOp
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}
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func (o *releaseDirHandleOp) kernelResponse() (b buffer.OutMessage) {
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b = buffer.NewOutMessage(0)
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return
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}
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////////////////////////////////////////////////////////////////////////
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// File handles
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////////////////////////////////////////////////////////////////////////
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type openFileOp struct {
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opCommon
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wrapped fuseops.OpenFileOp
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}
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func (o *openFileOp) kernelResponse() (b buffer.OutMessage) {
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b = buffer.NewOutMessage(unsafe.Sizeof(fusekernel.OpenOut{}))
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out := (*fusekernel.OpenOut)(b.Grow(unsafe.Sizeof(fusekernel.OpenOut{})))
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out.Fh = uint64(o.Handle)
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return
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}
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type readFileOp struct {
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opCommon
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wrapped fuseops.ReadFileOp
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}
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func (o *readFileOp) kernelResponse() (b buffer.OutMessage) {
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b = buffer.NewOutMessage(uintptr(len(o.Data)))
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b.Append(o.Data)
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return
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}
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type writeFileOp struct {
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opCommon
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wrapped fuseops.WriteFileOp
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}
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func (o *writeFileOp) kernelResponse() (b buffer.OutMessage) {
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b = buffer.NewOutMessage(unsafe.Sizeof(fusekernel.WriteOut{}))
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out := (*fusekernel.WriteOut)(b.Grow(unsafe.Sizeof(fusekernel.WriteOut{})))
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out.Size = uint32(len(o.Data))
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return
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}
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type syncFileOp struct {
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opCommon
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wrapped fuseops.SyncFileOp
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}
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func (o *syncFileOp) kernelResponse() (b buffer.OutMessage) {
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b = buffer.NewOutMessage(0)
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return
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}
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type flushFileOp struct {
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opCommon
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wrapped fuseops.FlushFileOp
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}
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func (o *flushFileOp) kernelResponse() (b buffer.OutMessage) {
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b = buffer.NewOutMessage(0)
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return
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}
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type releaseFileHandleOp struct {
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opCommon
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wrapped fuseops.ReleaseFileHandleOp
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}
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func (o *releaseFileHandleOp) kernelResponse() (b buffer.OutMessage) {
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b = buffer.NewOutMessage(0)
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return
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}
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// A sentinel used for unknown ops. The user is expected to respond with a
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// non-nil error.
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type unknownOp struct {
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opCommon
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opCode uint32
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inode fuseops.InodeID
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}
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func (o *unknownOp) ShortDesc() string {
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return fmt.Sprintf("<opcode %d>(inode=%d)", o.opCode, o.inode)
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}
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func (o *unknownOp) DebugString() string {
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return o.ShortDesc()
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}
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func (o *unknownOp) kernelResponse() (b buffer.OutMessage) {
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panic(fmt.Sprintf(
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"Expected an error response for unknown op: %s",
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o.ShortDesc()))
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}
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////////////////////////////////////////////////////////////////////////
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// Reading symlinks
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////////////////////////////////////////////////////////////////////////
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type readSymlinkOp struct {
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opCommon
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wrapped fuseops.ReadSymlinkOp
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}
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func (o *readSymlinkOp) kernelResponse() (b buffer.OutMessage) {
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b = buffer.NewOutMessage(uintptr(len(o.Target)))
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b.AppendString(o.Target)
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return
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}
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////////////////////////////////////////////////////////////////////////
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// Internal
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////////////////////////////////////////////////////////////////////////
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// Common implementation for our "internal" ops that don't need to be pretty.
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type internalOp struct {
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opCommon
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}
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func (o *internalOp) ShortDesc() string { return "<internalOp>" }
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func (o *internalOp) DebugString() string { return "<internalOp>" }
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type internalStatFSOp struct {
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internalOp
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}
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func (o *internalStatFSOp) kernelResponse() (b buffer.OutMessage) {
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b = buffer.NewOutMessage(unsafe.Sizeof(fusekernel.StatfsOut{}))
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b.Grow(unsafe.Sizeof(fusekernel.StatfsOut{}))
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return
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}
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type internalInterruptOp struct {
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internalOp
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FuseID uint64
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}
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func (o *internalInterruptOp) kernelResponse() (b buffer.OutMessage) {
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panic("Shouldn't get here.")
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}
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type internalInitOp struct {
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internalOp
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// In
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Kernel fusekernel.Protocol
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// Out
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Library fusekernel.Protocol
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MaxReadahead uint32
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Flags fusekernel.InitFlags
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MaxWrite uint32
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}
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func (o *internalInitOp) kernelResponse() (b buffer.OutMessage) {
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b = buffer.NewOutMessage(unsafe.Sizeof(fusekernel.InitOut{}))
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out := (*fusekernel.InitOut)(b.Grow(unsafe.Sizeof(fusekernel.InitOut{})))
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out.Major = o.Library.Major
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out.Minor = o.Library.Minor
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out.MaxReadahead = o.MaxReadahead
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out.Flags = uint32(o.Flags)
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out.MaxWrite = o.MaxWrite
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case *fuseops.ForgetInodeOp:
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// No response.
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case *fuseops.MkDirOp:
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size := fusekernel.EntryOutSize(o.protocol)
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b = buffer.NewOutMessage(size)
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out := (*fusekernel.EntryOut)(b.Grow(size))
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convertChildInodeEntry(&o.Entry, out)
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case *fuseops.CreateFileOp:
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eSize := fusekernel.EntryOutSize(o.protocol)
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b = buffer.NewOutMessage(eSize + unsafe.Sizeof(fusekernel.OpenOut{}))
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e := (*fusekernel.EntryOut)(b.Grow(eSize))
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convertChildInodeEntry(&o.Entry, e)
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oo := (*fusekernel.OpenOut)(b.Grow(unsafe.Sizeof(fusekernel.OpenOut{})))
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oo.Fh = uint64(o.Handle)
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case *fuseops.CreateSymlinkOp:
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size := fusekernel.EntryOutSize(o.protocol)
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b = buffer.NewOutMessage(size)
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out := (*fusekernel.EntryOut)(b.Grow(size))
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convertChildInodeEntry(&o.Entry, out)
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case *fuseops.RenameOp:
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b = buffer.NewOutMessage(0)
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case *fuseops.RmDirOp:
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b = buffer.NewOutMessage(0)
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case *fuseops.UnlinkOp:
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b = buffer.NewOutMessage(0)
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case *fuseops.OpenDirOp:
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b = buffer.NewOutMessage(unsafe.Sizeof(fusekernel.OpenOut{}))
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out := (*fusekernel.OpenOut)(b.Grow(unsafe.Sizeof(fusekernel.OpenOut{})))
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out.Fh = uint64(o.Handle)
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case *fuseops.ReadDirOp:
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b = buffer.NewOutMessage(uintptr(len(o.Data)))
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b.Append(o.Data)
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case *fuseops.ReleaseDirHandleOp:
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b = buffer.NewOutMessage(0)
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case *fuseops.OpenFileOp:
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b = buffer.NewOutMessage(unsafe.Sizeof(fusekernel.OpenOut{}))
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out := (*fusekernel.OpenOut)(b.Grow(unsafe.Sizeof(fusekernel.OpenOut{})))
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out.Fh = uint64(o.Handle)
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case *fuseops.ReadFileOp:
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b = buffer.NewOutMessage(uintptr(len(o.Data)))
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b.Append(o.Data)
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case *fuseops.WriteFileOp:
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b = buffer.NewOutMessage(unsafe.Sizeof(fusekernel.WriteOut{}))
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out := (*fusekernel.WriteOut)(b.Grow(unsafe.Sizeof(fusekernel.WriteOut{})))
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out.Size = uint32(len(o.Data))
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case *fuseops.SyncFileOp:
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b = buffer.NewOutMessage(0)
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case *fuseops.FlushFileOp:
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b = buffer.NewOutMessage(0)
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case *fuseops.ReleaseFileHandleOp:
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b = buffer.NewOutMessage(0)
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case *fuseops.ReadSymlinkOp:
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b = buffer.NewOutMessage(uintptr(len(o.Target)))
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b.AppendString(o.Target)
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case *internalStatFSOp:
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b = buffer.NewOutMessage(unsafe.Sizeof(fusekernel.StatfsOut{}))
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b.Grow(unsafe.Sizeof(fusekernel.StatfsOut{}))
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case *internalInterruptOp:
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// No response.
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case *internalInitOp:
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b = buffer.NewOutMessage(unsafe.Sizeof(fusekernel.InitOut{}))
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out := (*fusekernel.InitOut)(b.Grow(unsafe.Sizeof(fusekernel.InitOut{})))
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out.Major = o.Library.Major
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out.Minor = o.Library.Minor
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out.MaxReadahead = o.MaxReadahead
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out.Flags = uint32(o.Flags)
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out.MaxWrite = o.MaxWrite
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default:
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err = syscall.ENOSYS
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}
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return
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}
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