mirror of
https://github.com/octoleo/restic.git
synced 2024-12-23 03:18:55 +00:00
29 lines
549 B
Go
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
|
|
}
|