Moved the kernel response functions to a more appropriate place.
Aaron Jacobs
parent
4c33dd3f40
commit
5c332f767b
173
conversions.go
173
conversions.go
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@ -17,6 +17,7 @@ package fuse
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import (
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"bytes"
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"errors"
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"fmt"
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"os"
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"syscall"
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"time"
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@ -27,6 +28,10 @@ import (
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"github.com/jacobsa/fuse/internal/fusekernel"
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)
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////////////////////////////////////////////////////////////////////////
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// Incoming messages
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////////////////////////////////////////////////////////////////////////
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// Convert a kernel message to an appropriate op. If the op is unknown, a
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// special unexported type will be used.
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//
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@ -378,6 +383,174 @@ func convertInMessage(
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return
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}
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////////////////////////////////////////////////////////////////////////
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// Outgoing messages
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////////////////////////////////////////////////////////////////////////
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// Return the response that should be sent to the kernel. If the op requires no
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// response, return a nil response.
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func kernelResponse(
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fuseID uint64,
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op interface{},
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opErr error,
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protocol fusekernel.Protocol) (msg []byte) {
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// If the user replied with an error, create room enough just for the result
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// header and fill it in with an error. Otherwise create an appropriate
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// response.
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var b buffer.OutMessage
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if opErr != nil {
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b = buffer.NewOutMessage(0)
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if errno, ok := opErr.(syscall.Errno); ok {
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b.OutHeader().Error = -int32(errno)
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} else {
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b.OutHeader().Error = -int32(syscall.EIO)
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}
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} else {
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b = kernelResponseForOp(op, protocol)
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}
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msg = b.Bytes()
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// Fill in the rest of the header, if a response is required.
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if msg != nil {
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h := b.OutHeader()
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h.Unique = fuseID
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h.Len = uint32(len(msg))
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}
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return
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}
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// Like kernelResponse, but assumes the user replied with a nil error to the
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// op. Returns a nil response if no response is required.
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func kernelResponseForOp(
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op interface{},
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protocol fusekernel.Protocol) (b buffer.OutMessage) {
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// Create the appropriate output message
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switch o := op.(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.Entry, out)
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case *fuseops.GetInodeAttributesOp:
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size := fusekernel.AttrOutSize(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(
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o.AttributesExpiration)
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convertAttributes(o.Inode, &o.Attributes, &out.Attr)
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case *fuseops.SetInodeAttributesOp:
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size := fusekernel.AttrOutSize(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(
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o.AttributesExpiration)
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convertAttributes(o.Inode, &o.Attributes, &out.Attr)
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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(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(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(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 *statFSOp:
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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 *interruptOp:
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// No response.
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case *initOp:
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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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panic(fmt.Sprintf("Unknown op: %#v", op))
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}
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return
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}
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////////////////////////////////////////////////////////////////////////
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// General conversions
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////////////////////////////////////////////////////////////////////////
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func convertTime(t time.Time) (secs uint64, nsec uint32) {
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totalNano := t.UnixNano()
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secs = uint64(totalNano / 1e9)
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172
ops.go
172
ops.go
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@ -15,179 +15,10 @@
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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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"github.com/jacobsa/fuse/internal/buffer"
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"github.com/jacobsa/fuse/internal/fusekernel"
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)
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// Return the response that should be sent to the kernel. If the op requires no
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// response, return a nil response.
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func kernelResponse(
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fuseID uint64,
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op interface{},
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opErr error,
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protocol fusekernel.Protocol) (msg []byte) {
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// If the user replied with an error, create room enough just for the result
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// header and fill it in with an error. Otherwise create an appropriate
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// response.
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var b buffer.OutMessage
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if opErr != nil {
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b = buffer.NewOutMessage(0)
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if errno, ok := opErr.(syscall.Errno); ok {
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b.OutHeader().Error = -int32(errno)
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} else {
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b.OutHeader().Error = -int32(syscall.EIO)
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}
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} else {
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b = kernelResponseForOp(op, protocol)
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}
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msg = b.Bytes()
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// Fill in the rest of the header, if a response is required.
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if msg != nil {
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h := b.OutHeader()
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h.Unique = fuseID
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h.Len = uint32(len(msg))
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}
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return
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}
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// Like kernelResponse, but assumes the user replied with a nil error to the
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// op. Returns a nil response if no response is required.
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func kernelResponseForOp(
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op interface{},
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protocol fusekernel.Protocol) (b buffer.OutMessage) {
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// Create the appropriate output message
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switch o := op.(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.Entry, out)
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case *fuseops.GetInodeAttributesOp:
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size := fusekernel.AttrOutSize(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(
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o.AttributesExpiration)
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convertAttributes(o.Inode, &o.Attributes, &out.Attr)
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case *fuseops.SetInodeAttributesOp:
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size := fusekernel.AttrOutSize(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(
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o.AttributesExpiration)
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convertAttributes(o.Inode, &o.Attributes, &out.Attr)
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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(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(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(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 *statFSOp:
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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 *interruptOp:
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// No response.
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case *initOp:
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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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panic(fmt.Sprintf("Unknown op: %#v", op))
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}
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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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// 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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@ -195,13 +26,16 @@ type unknownOp struct {
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inode fuseops.InodeID
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}
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// Required in order to mount on OS X.
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type statFSOp struct {
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}
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// Causes us to cancel the associated context.
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type interruptOp struct {
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FuseID uint64
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}
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// Required in order to mount on Linux and OS X.
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type initOp struct {
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// In
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Kernel fusekernel.Protocol
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