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Merge pull request #3362 from greatroar/darwin-preallocate

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Use FcntlFstore to preallocate on Mac
This commit is contained in:
MichaelEischer 2021-04-10 22:47:56 +02:00 committed by GitHub
commit cc254dfefe
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1 changed files with 2 additions and 7 deletions
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9
internal/restorer/preallocate_darwin.go
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@ -2,8 +2,6 @@ package restorer
import (
"os"
"runtime"
"unsafe"
"golang.org/x/sys/unix"
)
@ -16,7 +14,7 @@ func preallocateFile(wr *os.File, size int64) error {
Offset: 0,
Length: size,
}
_, err := unix.FcntlInt(wr.Fd(), unix.F_PREALLOCATE, int(uintptr(unsafe.Pointer(&fst))))
err := unix.FcntlFstore(wr.Fd(), unix.F_PREALLOCATE, &fst)
if err == nil {
return nil
@ -24,10 +22,7 @@ func preallocateFile(wr *os.File, size int64) error {
// just take preallocation in any form, but still ask for everything
fst.Flags = unix.F_ALLOCATEALL
_, err = unix.FcntlInt(wr.Fd(), unix.F_PREALLOCATE, int(uintptr(unsafe.Pointer(&fst))))
// Keep struct alive until fcntl has returned
runtime.KeepAlive(fst)
err = unix.FcntlFstore(wr.Fd(), unix.F_PREALLOCATE, &fst)
return err
}