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package fusefrontend
import (
"runtime"
"golang.org/x/sys/unix"
"github.com/rfjakob/gocryptfs/internal/tlog"
)
const (
quirkBrokenFalloc = uint64(1 << iota)
quirkDuplicateIno1
)
func detectQuirks(cipherdir string) (q uint64) {
const (
// From Linux' man statfs
BTRFS_SUPER_MAGIC = 0x9123683e
// From https://github.com/rfjakob/gocryptfs/issues/585#issuecomment-887370065
DARWIN_EXFAT_MAGIC = 35
)
var st unix.Statfs_t
err := unix.Statfs(cipherdir, &st)
if err != nil {
tlog.Warn.Printf("detectQuirks: Statfs on %q failed: %v", cipherdir, err)
return 0
}
logQuirk := func(s string) {
tlog.Info.Printf(tlog.ColorYellow + "detectQuirks: " + s + tlog.ColorReset)
}
// Preallocation on Btrfs is broken ( https://github.com/rfjakob/gocryptfs/issues/395 )
// and slow ( https://github.com/rfjakob/gocryptfs/issues/63 ).
//
// Cast to uint32 avoids compile error on arm: "constant 2435016766 overflows int32"
if uint32(st.Type) == BTRFS_SUPER_MAGIC {
logQuirk("Btrfs detected, forcing -noprealloc. See https://github.com/rfjakob/gocryptfs/issues/395 for why.")
q |= quirkBrokenFalloc
}
// On MacOS ExFAT, all empty files share inode number 1:
// https://github.com/rfjakob/gocryptfs/issues/585
if runtime.GOOS == "darwin" && st.Type == DARWIN_EXFAT_MAGIC {
logQuirk("ExFAT detected, disabling hard links. See https://github.com/rfjakob/gocryptfs/issues/585 for why.")
q |= quirkDuplicateIno1
}
return q
}
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