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8975da4e84
This is an enhancement to the XL/distributed-XL mode. FS mode is unaffected. The ReadFileWithVerify storage-layer call is similar to ReadFile with the additional functionality of performing bit-rot checking. It accepts additional parameters for a hashing algorithm to use and the expected hex-encoded hash string. This patch provides significant performance improvement because: 1. combines the step of reading the file (during erasure-decoding/reconstruction) with bit-rot verification; 2. limits the number of file-reads; and 3. avoids transferring the file over the network for bit-rot verification. ReadFile API is implemented as ReadFileWithVerify with empty hashing arguments. Credits to AB and Harsha for the algorithmic improvement. Fixes #4236.
92 lines
3.2 KiB
Go
92 lines
3.2 KiB
Go
/*
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* Minio Cloud Storage, (C) 2015, 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 cmd
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import (
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"errors"
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"fmt"
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)
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// errUnexpected - unexpected error, requires manual intervention.
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var errUnexpected = errors.New("Unexpected error, please report this issue at https://github.com/minio/minio/issues")
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// errCorruptedFormat - corrupted backend format.
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var errCorruptedFormat = errors.New("corrupted backend format, please join https://slack.minio.io for assistance")
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// errUnformattedDisk - unformatted disk found.
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var errUnformattedDisk = errors.New("unformatted disk found")
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// errDiskFull - cannot create volume or files when disk is full.
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var errDiskFull = errors.New("disk path full")
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// errDiskNotFount - cannot find the underlying configured disk anymore.
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var errDiskNotFound = errors.New("disk not found")
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// errFaultyRemoteDisk - remote disk is faulty.
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var errFaultyRemoteDisk = errors.New("remote disk is faulty")
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// errFaultyDisk - disk is faulty.
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var errFaultyDisk = errors.New("disk is faulty")
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// errDiskAccessDenied - we don't have write permissions on disk.
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var errDiskAccessDenied = errors.New("disk access denied")
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// errFileNotFound - cannot find the file.
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var errFileNotFound = errors.New("file not found")
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// errFileNameTooLong - given file name is too long than supported length.
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var errFileNameTooLong = errors.New("file name too long")
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// errFileComponentInvalid - given file name has invalid components.
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var errFileComponentInvalid = errors.New("file name has invalid components")
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// errVolumeExists - cannot create same volume again.
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var errVolumeExists = errors.New("volume already exists")
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// errIsNotRegular - not of regular file type.
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var errIsNotRegular = errors.New("not of regular file type")
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// errVolumeNotFound - cannot find the volume.
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var errVolumeNotFound = errors.New("volume not found")
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// errVolumeNotEmpty - volume not empty.
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var errVolumeNotEmpty = errors.New("volume is not empty")
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// errVolumeAccessDenied - cannot access volume, insufficient permissions.
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var errVolumeAccessDenied = errors.New("volume access denied")
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// errVolumeAccessDenied - cannot access file, insufficient permissions.
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var errFileAccessDenied = errors.New("file access denied")
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// errBitrotHashAlgoInvalid - the algo for bit-rot hash
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// verification is empty or invalid.
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var errBitrotHashAlgoInvalid = errors.New("bit-rot hash algorithm is invalid")
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// hashMisMatchError - represents a bit-rot hash verification failure
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// error.
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type hashMismatchError struct {
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expected string
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computed string
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}
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// error method for the hashMismatchError
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func (h hashMismatchError) Error() string {
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return fmt.Sprintf(
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"Bitrot verification mismatch - expected %v, received %v",
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h.expected, h.computed)
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}
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