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added the copy_file_range loop, tested NFS

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This commit is contained in:
Nicolas Raynaud
2020-10-17 02:24:16 +02:00
parent 9beb9c3ac5
commit b10c5ca6e8
1 changed files with 7 additions and 2 deletions
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9
@xen-orchestra/fs/src/local.js
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@@ -7,6 +7,7 @@ import { Syscall6 } from 'syscall'
/**
* @returns the number of byte effectively copied, needs to be called in a loop!
* @throws Error if the syscall returned -1
*/
function copyFileRangeSyscall(fdIn, offsetIn, fdOut, offsetOut, dataLen, flags = 0) {
// we are stuck on linux x86_64
@@ -18,9 +19,10 @@ function copyFileRangeSyscall(fdIn, offsetIn, fdOut, offsetOut, dataLen, flags =
return offsetInBuffer
}
// https://man7.org/linux/man-pages/man2/copy_file_range.2.html
const SYS_copy_file_range = 326
const [copied, _, errno] = Syscall6(SYS_copy_file_range, fdIn, wrapOffset(offsetIn), fdOut, wrapOffset(offsetOut), dataLen, flags)
if (errno !== 0) {
if (copied === -1) {
throw new Error('Error no ' + errno)
}
return copied
@@ -117,7 +119,10 @@ export default class LocalHandler extends RemoteHandlerAbstract {
* @returns {Promise<void>}
*/
async copyFileRange(fdIn, offsetIn, fdOut, offsetOut, dataLen) {
await copyFileRangeSyscall(fdIn.fd, offsetIn, fdOut.fd, offsetOut, dataLen)
let copied = 0
do {
copied += await copyFileRangeSyscall(fdIn.fd, offsetIn + copied, fdOut.fd, offsetOut + copied, dataLen - copied)
} while (dataLen - copied > 0)
}
async _read(file, buffer, position) {