Determines when to start hashing long names instead
of hardcoded 255. Will be used to alleviate "name too long"
issues some users see on cloud storage.
https://github.com/rfjakob/gocryptfs/issues/499
Jobs currently fail like this:
/usr/bin/fusermount: option allow_other only allowed if 'user_allow_other' is set in /etc/fuse.conf
fs.Mount failed: fusermount exited with code 256
--- FAIL: TestForceOwner (0.05s)
main_test.go:438: mount failed: exit status 19
FAIL
FAIL github.com/rfjakob/gocryptfs/v2/tests/defaults 1.584s
Reported by codacity:
internal/cryptocore/cryptocore.go
Minor icon MINOR
Code Style
should omit type AEADTypeEnum from declaration of var BackendAESSIV; it will be inferred from the right-hand side
var BackendAESSIV AEADTypeEnum = AEADTypeEnum{"AES-SIV-512", "Go", siv_aead.NonceSize}
Minor icon MINOR
Code Style
should omit type AEADTypeEnum from declaration of var BackendXChaCha20Poly1305; it will be inferred from the right-hand side
var BackendXChaCha20Poly1305 AEADTypeEnum = AEADTypeEnum{"XChaCha20-Poly1305", "Go", chacha20poly1305.NonceSizeX}
Minor icon MINOR
Code Style
should omit type AEADTypeEnum from declaration of var BackendXChaCha20Poly1305OpenSSL; it will be inferred from the right-hand side
var BackendXChaCha20Poly1305OpenSSL AEADTypeEnum = AEADTypeEnum{"XChaCha20-Poly1305", "OpenSSL", chacha20poly1305.NonceSizeX}
Found 2 possible new issues
internal/cryptocore/cryptocore.go
Minor icon MINOR
Code Style
should omit type AEADTypeEnum from declaration of var BackendOpenSSL; it will be inferred from the right-hand side
var BackendOpenSSL AEADTypeEnum = AEADTypeEnum{"AES-GCM-256", "OpenSSL", 16}
Minor icon MINOR
Code Style
should omit type AEADTypeEnum from declaration of var BackendGoGCM; it will be inferred from the right-hand side
var BackendGoGCM AEADTypeEnum = AEADTypeEnum{"AES-GCM-256", "Go", 16}
Example on Raspberry Pi 4:
$ ./gocryptfs/gocryptfs -init $(mktemp -d)
Notice: Your CPU does not have AES acceleration. Consider using -xchacha for better performance.
Choose a password for protecting your files.
Password:
https://github.com/rfjakob/gocryptfs/issues/607
When somebody posts "gocryptfs -speed" results, they are
most helpful together with the CPU model. Add the cpu model
to the output.
Example:
$ ./gocryptfs -speed
gocryptfs v2.2.0-beta1-5-g52b0444-dirty; go-fuse v2.1.1-0.20210825171523-3ab5d95a30ae; 2021-09-14 go1.17.1 linux/amd64
cpu: Intel(R) Core(TM) i5-3470 CPU @ 3.20GHz; with AES acceleration
AES-GCM-256-OpenSSL 862.79 MB/s
AES-GCM-256-Go 997.71 MB/s (selected in auto mode)
AES-SIV-512-Go 159.58 MB/s
XChaCha20-Poly1305-OpenSSL 729.65 MB/s
XChaCha20-Poly1305-Go 843.97 MB/s (selected in auto mode)
We used to have "first Translate() wins". This is not deterministic,
as the LOOKUP for the root directory does not seem to reach us, so
the first user LOOKUP would win, which may be on a mountpoint.
I noticed that growslice() shows up in the cpuprofile.
Avoiding slice append for the private jey copy gives a 0.6% speedup:
gocryptfs/internal/speed$ benchstat old new
name old time/op new time/op delta
StupidXchacha-4 5.68µs ± 0% 5.65µs ± 0% -0.63% (p=0.008 n=5+5)
name old speed new speed delta
StupidXchacha-4 721MB/s ± 0% 725MB/s ± 0% +0.63% (p=0.008 n=5+5)
2% performance improvement, almost for free.
gocryptfs/internal/speed$ benchstat old new
name old time/op new time/op delta
StupidXchacha-4 5.82µs ± 0% 5.68µs ± 0% -2.37% (p=0.008 n=5+5)
name old speed new speed delta
StupidXchacha-4 704MB/s ± 0% 721MB/s ± 0% +2.43% (p=0.008 n=5+5)
Gets the decryption speed to the same level as the
encryption speed.
internal/speed$ benchstat old.txt new.txt
name old time/op new time/op delta
StupidXchacha-4 732MB/s ± 0% 740MB/s ± 0% ~ (p=1.000 n=1+1)
StupidXchachaDecrypt-4 602MB/s ± 0% 741MB/s ± 0% ~ (p=1.000 n=1+1)
Go has a high overhead for each C call, so batch
all openssl operations in the new C function chacha20poly1305_seal.
Benchmark results:
internal/speed$ go test -bench BenchmarkStupidXchacha -count 10 > old.txt
internal/speed$ go test -bench BenchmarkStupidXchacha -count 10 > new.txt
internal/speed$ benchstat old.txt new.txt
name old time/op new time/op delta
StupidXchacha-4 8.79µs ± 1% 7.25µs ± 1% -17.54% (p=0.000 n=10+10)
name old speed new speed delta
StupidXchacha-4 466MB/s ± 1% 565MB/s ± 1% +21.27% (p=0.000 n=10+10)
