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50 lines
1.3 KiB
Go
50 lines
1.3 KiB
Go
// Package syscallcompat wraps Linux-specific syscalls.
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package syscallcompat
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import (
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"syscall"
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"golang.org/x/sys/unix"
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)
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const (
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_FALLOC_FL_KEEP_SIZE = 0x01
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// O_DIRECT means oncached I/O on Linux. No direct equivalent on MacOS and defined
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// to zero there.
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O_DIRECT = syscall.O_DIRECT
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// O_PATH is only defined on Linux
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O_PATH = unix.O_PATH
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// RENAME_NOREPLACE is only defined on Linux
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RENAME_NOREPLACE = unix.RENAME_NOREPLACE
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)
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// EnospcPrealloc preallocates ciphertext space without changing the file
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// size. This guarantees that we don't run out of space while writing a
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// ciphertext block (that would corrupt the block).
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func EnospcPrealloc(fd int, off int64, len int64) (err error) {
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for {
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err = syscall.Fallocate(fd, _FALLOC_FL_KEEP_SIZE, off, len)
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if err == syscall.EINTR {
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// fallocate, like many syscalls, can return EINTR. This is not an
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// error and just signifies that the operation was interrupted by a
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// signal and we should try again.
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continue
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}
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if err == syscall.EOPNOTSUPP {
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// ZFS and ext3 do not support fallocate. Warn but continue anyway.
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// https://github.com/rfjakob/gocryptfs/issues/22
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return nil
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}
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return err
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}
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}
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// Getdents syscall with "." and ".." filtered out.
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func Getdents(fd int) ([]DirEntry, error) {
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entries, _, err := getdents(fd)
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return entries, err
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}
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