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request.go
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request.go
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package fuse
import (
"bytes"
"fmt"
"log"
"strings"
"time"
"unsafe"
)
var sizeOfOutHeader = unsafe.Sizeof(OutHeader{})
var zeroOutBuf [outputHeaderSize]byte
type request struct {
inputBuf []byte
// These split up inputBuf.
inHeader *InHeader // generic header
inData unsafe.Pointer // per op data
arg []byte // flat data.
filenames []string // filename arguments
// Unstructured data, a pointer to the relevant XxxxOut struct.
outData unsafe.Pointer
status Status
flatData []byte
fdData *readResultFd
// In case of read, keep read result here so we can call
// Done() on it.
readResult ReadResult
// Start timestamp for timing info.
startTime time.Time
// All information pertaining to opcode of this request.
handler *operationHandler
// Request storage. For large inputs and outputs, use data
// obtained through bufferpool.
bufferPoolInputBuf []byte
bufferPoolOutputBuf []byte
// For small pieces of data, we use the following inlines
// arrays:
//
// Output header and structured data.
outBuf [outputHeaderSize]byte
// Input, if small enough to fit here.
smallInputBuf [128]byte
context Context
}
func (r *request) clear() {
r.inputBuf = nil
r.inHeader = nil
r.inData = nil
r.arg = nil
r.filenames = nil
r.outData = nil
r.status = OK
r.flatData = nil
r.fdData = nil
r.startTime = time.Time{}
r.handler = nil
r.readResult = nil
}
func (r *request) InputDebug() string {
val := " "
if r.handler.DecodeIn != nil {
val = fmt.Sprintf(" data: %v ", Print(r.handler.DecodeIn(r.inData)))
}
names := ""
if r.filenames != nil {
names = fmt.Sprintf("names: %v", r.filenames)
}
if len(r.arg) > 0 {
names += fmt.Sprintf(" %d bytes", len(r.arg))
}
return fmt.Sprintf("Dispatch: %s, NodeId: %v.%v%v",
operationName(r.inHeader.Opcode), r.inHeader.NodeId, val, names)
}
func (r *request) OutputDebug() string {
var dataStr string
if r.handler.DecodeOut != nil && r.outData != nil {
dataStr = Print(r.handler.DecodeOut(r.outData))
}
max := 1024
if len(dataStr) > max {
dataStr = dataStr[:max] + fmt.Sprintf(" ...trimmed")
}
flatStr := ""
if r.flatDataSize() > 0 {
if r.handler.FileNameOut {
s := strings.TrimRight(string(r.flatData), "\x00")
flatStr = fmt.Sprintf(" %q", s)
} else {
spl := ""
if r.fdData != nil {
spl = " (fd data)"
}
flatStr = fmt.Sprintf(" %d bytes data%s\n", r.flatDataSize(), spl)
}
}
return fmt.Sprintf("Serialize: %s code: %v value: %v%v",
operationName(r.inHeader.Opcode), r.status, dataStr, flatStr)
}
// setInput returns true if it takes ownership of the argument, false if not.
func (r *request) setInput(input []byte) bool {
if len(input) < len(r.smallInputBuf) {
copy(r.smallInputBuf[:], input)
r.inputBuf = r.smallInputBuf[:len(input)]
return false
}
r.inputBuf = input
r.bufferPoolInputBuf = input
return true
}
func (r *request) parse() {
inHSize := int(unsafe.Sizeof(InHeader{}))
if len(r.inputBuf) < inHSize {
log.Printf("Short read for input header: %v", r.inputBuf)
return
}
r.inHeader = (*InHeader)(unsafe.Pointer(&r.inputBuf[0]))
r.arg = r.inputBuf[:]
r.handler = getHandler(r.inHeader.Opcode)
if r.handler == nil {
log.Printf("Unknown opcode %d", r.inHeader.Opcode)
r.status = ENOSYS
return
}
if len(r.arg) < int(r.handler.InputSize) {
log.Printf("Short read for %v: %v", operationName(r.inHeader.Opcode), r.arg)
r.status = EIO
return
}
if r.handler.InputSize > 0 {
r.inData = unsafe.Pointer(&r.arg[0])
r.arg = r.arg[r.handler.InputSize:]
} else {
r.arg = r.arg[inHSize:]
}
count := r.handler.FileNames
if count > 0 {
if count == 1 {
r.filenames = []string{string(r.arg[:len(r.arg)-1])}
} else {
names := bytes.SplitN(r.arg[:len(r.arg)-1], []byte{0}, count)
r.filenames = make([]string, len(names))
for i, n := range names {
r.filenames[i] = string(n)
}
if len(names) != count {
log.Println("filename argument mismatch", names, count)
r.status = EIO
}
}
}
copy(r.outBuf[:r.handler.OutputSize+sizeOfOutHeader],
zeroOutBuf[:r.handler.OutputSize+sizeOfOutHeader])
r.outData = unsafe.Pointer(&r.outBuf[sizeOfOutHeader])
}
func (r *request) serializeHeader(dataSize int) (header []byte) {
dataLength := r.handler.OutputSize
if r.outData == nil || r.status > OK {
dataLength = 0
}
sizeOfOutHeader := unsafe.Sizeof(OutHeader{})
header = r.outBuf[:sizeOfOutHeader+dataLength]
o := (*OutHeader)(unsafe.Pointer(&header[0]))
o.Unique = r.inHeader.Unique
o.Status = int32(-r.status)
o.Length = uint32(
int(sizeOfOutHeader) + int(dataLength) + dataSize)
var asSlice []byte
toSlice(&asSlice, r.outData, dataLength)
copy(header[sizeOfOutHeader:], asSlice)
return header
}
func (r *request) flatDataSize() int {
if r.fdData != nil {
return r.fdData.Size()
}
return len(r.flatData)
}