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mirror of https://github.com/octoleo/restic.git synced 2024-12-05 03:13:18 +00:00
restic/internal/fs/preallocate_darwin.go
2023-06-09 11:49:06 +03:00

29 lines
549 B
Go

package fs
import (
"os"
"golang.org/x/sys/unix"
)
func PreallocateFile(wr *os.File, size int64) error {
// try contiguous first
fst := unix.Fstore_t{
Flags: unix.F_ALLOCATECONTIG | unix.F_ALLOCATEALL,
Posmode: unix.F_PEOFPOSMODE,
Offset: 0,
Length: size,
}
err := unix.FcntlFstore(wr.Fd(), unix.F_PREALLOCATE, &fst)
if err == nil {
return nil
}
// just take preallocation in any form, but still ask for everything
fst.Flags = unix.F_ALLOCATEALL
err = unix.FcntlFstore(wr.Fd(), unix.F_PREALLOCATE, &fst)
return err
}