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60 lines
1.6 KiB
60 lines
1.6 KiB
/*
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* Minio Cloud Storage, (C) 2016 Minio, Inc.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package main
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import (
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"errors"
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"github.com/klauspost/reedsolomon"
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)
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// erasure storage layer.
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type erasure struct {
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ReedSolomon reedsolomon.Encoder // Erasure encoder/decoder.
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DataBlocks int
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ParityBlocks int
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storageDisks []StorageAPI
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}
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// errUnexpected - returned for any unexpected error.
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var errUnexpected = errors.New("Unexpected error - please report at https://github.com/minio/minio/issues")
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// newErasure instantiate a new erasure.
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func newErasure(disks []StorageAPI) (*erasure, error) {
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// Initialize E.
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e := &erasure{}
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// Calculate data and parity blocks.
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dataBlocks, parityBlocks := len(disks)/2, len(disks)/2
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// Initialize reed solomon encoding.
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rs, err := reedsolomon.New(dataBlocks, parityBlocks)
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if err != nil {
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return nil, err
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}
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// Save the reedsolomon.
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e.DataBlocks = dataBlocks
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e.ParityBlocks = parityBlocks
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e.ReedSolomon = rs
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// Save all the initialized storage disks.
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e.storageDisks = disks
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// Return successfully initialized.
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return e, nil
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}
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