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30 lines
624 B
Go
30 lines
624 B
Go
package fs
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import (
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"os"
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"syscall"
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"golang.org/x/sys/unix"
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)
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func PreallocateFile(wr *os.File, size int64) error {
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if size <= 0 {
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return nil
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}
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// int fallocate(int fd, int mode, off_t offset, off_t len)
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// use mode = 0 to also change the file size
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return ignoringEINTR(func() error { return unix.Fallocate(int(wr.Fd()), 0, 0, size) })
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}
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// ignoringEINTR makes a function call and repeats it if it returns
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// an EINTR error.
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// copied from /usr/lib/go/src/internal/poll/fd_posix.go of go 1.23.1
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func ignoringEINTR(fn func() error) error {
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for {
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err := fn()
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if err != syscall.EINTR {
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return err
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}
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}
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}
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