37 lines
993 B
Go
37 lines
993 B
Go
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package syscallcompat
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import (
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"golang.org/x/sys/unix"
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"github.com/rfjakob/gocryptfs/internal/tlog"
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)
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// DetectQuirks decides if there are known quirks on the backing filesystem
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// that need to be workarounded.
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//
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// Tested by tests/root_test.TestBtrfsQuirks
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func DetectQuirks(cipherdir string) (q uint64) {
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const (
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// From Linux' man statfs
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BTRFS_SUPER_MAGIC = 0x9123683e
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)
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var st unix.Statfs_t
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err := unix.Statfs(cipherdir, &st)
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if err != nil {
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tlog.Warn.Printf("DetectQuirks: Statfs on %q failed: %v", cipherdir, err)
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return 0
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}
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// Preallocation on Btrfs is broken ( https://github.com/rfjakob/gocryptfs/issues/395 )
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// and slow ( https://github.com/rfjakob/gocryptfs/issues/63 ).
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//
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// Cast to uint32 avoids compile error on arm: "constant 2435016766 overflows int32"
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if uint32(st.Type) == BTRFS_SUPER_MAGIC {
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logQuirk("Btrfs detected, forcing -noprealloc. See https://github.com/rfjakob/gocryptfs/issues/395 for why.")
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q |= QuirkBrokenFalloc
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}
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return q
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}
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