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67 lines
1.8 KiB
67 lines
1.8 KiB
![]()
8 years ago
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/*
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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 "sync"
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// AppendFile - append data buffer at path.
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func (e erasure) AppendFile(volume, path string, dataBuffer []byte) (n int64, err error) {
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// Split the input buffer into data and parity blocks.
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var blocks [][]byte
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blocks, err = e.ReedSolomon.Split(dataBuffer)
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if err != nil {
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return 0, err
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}
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// Encode parity blocks using data blocks.
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err = e.ReedSolomon.Encode(blocks)
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if err != nil {
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return 0, err
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}
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var wg = &sync.WaitGroup{}
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var wErrs = make([]error, len(e.storageDisks))
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// Write encoded data to quorum disks in parallel.
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for index, disk := range e.storageDisks {
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if disk == nil {
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continue
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}
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wg.Add(1)
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// Write encoded data in routine.
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go func(index int, disk StorageAPI) {
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defer wg.Done()
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// Pick the block from the distribution.
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blockIndex := e.distribution[index] - 1
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n, wErr := disk.AppendFile(volume, path, blocks[blockIndex])
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if wErr != nil {
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wErrs[index] = wErr
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return
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}
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if n != int64(len(blocks[blockIndex])) {
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wErrs[index] = errUnexpected
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return
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}
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wErrs[index] = nil
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}(index, disk)
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}
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// Wait for all the appends to finish.
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wg.Wait()
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return int64(len(dataBuffer)), nil
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}
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