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Prevent unnecessary verification of parity blocks while reading (#4683)

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* Prevent unnecessary verification of parity blocks while reading erasure
  coded file.
* Update klauspost/reedsolomon and just only reconstruct data blocks while
  reading (prevent unnecessary parity block reconstruction)
* Remove Verification of (all) reconstructed Data and Parity blocks since
  in our case we are protected by bit rot protection. And even if the
  verification would fail (essentially impossible) there is no way to
  definitively say whether the data is still correct or not, so this call
  make no sense for our use case.
This commit is contained in:
Frank Wessels
2017-08-11 18:24:48 -07:00
committed by Harshavardhana
parent 98b62cbec8
commit fffe4ac7e6
12 changed files with 387 additions and 119 deletions
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16
vendor/github.com/klauspost/reedsolomon/galois_amd64.go generated vendored
View File

@@ -5,10 +5,6 @@
package reedsolomon
import (
"github.com/klauspost/cpuid"
)
//go:noescape
func galMulSSSE3(low, high, in, out []byte)
@@ -40,12 +36,12 @@ func galMulSSSE3Xor(low, high, in, out []byte) {
}
*/
func galMulSlice(c byte, in, out []byte) {
func galMulSlice(c byte, in, out []byte, ssse3, avx2 bool) {
var done int
if cpuid.CPU.AVX2() {
if avx2 {
galMulAVX2(mulTableLow[c][:], mulTableHigh[c][:], in, out)
done = (len(in) >> 5) << 5
} else if cpuid.CPU.SSSE3() {
} else if ssse3 {
galMulSSSE3(mulTableLow[c][:], mulTableHigh[c][:], in, out)
done = (len(in) >> 4) << 4
}
@@ -58,12 +54,12 @@ func galMulSlice(c byte, in, out []byte) {
}
}
func galMulSliceXor(c byte, in, out []byte) {
func galMulSliceXor(c byte, in, out []byte, ssse3, avx2 bool) {
var done int
if cpuid.CPU.AVX2() {
if avx2 {
galMulAVX2Xor(mulTableLow[c][:], mulTableHigh[c][:], in, out)
done = (len(in) >> 5) << 5
} else if cpuid.CPU.SSSE3() {
} else if ssse3 {
galMulSSSE3Xor(mulTableLow[c][:], mulTableHigh[c][:], in, out)
done = (len(in) >> 4) << 4
}