minio/cmd/xl-storage-format-utils.go

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// Copyright (c) 2015-2021 MinIO, Inc.
//
// This file is part of MinIO Object Storage stack
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU Affero General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU Affero General Public License for more details.
//
// You should have received a copy of the GNU Affero General Public License
// along with this program. If not, see <http://www.gnu.org/licenses/>.
package cmd
import (
"sort"
jsoniter "github.com/json-iterator/go"
)
// versionsSorter sorts FileInfo slices by version.
type versionsSorter []FileInfo
func (v versionsSorter) sort() {
sort.Slice(v, func(i, j int) bool {
if v[i].IsLatest {
return true
}
if v[j].IsLatest {
return false
}
return v[i].ModTime.After(v[j].ModTime)
})
}
func getFileInfoVersions(xlMetaBuf []byte, volume, path string) (FileInfoVersions, error) {
if isXL2V1Format(xlMetaBuf) {
var xlMeta xlMetaV2
if err := xlMeta.Load(xlMetaBuf); err != nil {
return FileInfoVersions{}, err
}
versions, latestModTime, err := xlMeta.ListVersions(volume, path)
if err != nil {
return FileInfoVersions{}, err
}
return FileInfoVersions{
Volume: volume,
Name: path,
Versions: versions,
LatestModTime: latestModTime,
}, nil
}
xlMeta := &xlMetaV1Object{}
var json = jsoniter.ConfigCompatibleWithStandardLibrary
if err := json.Unmarshal(xlMetaBuf, xlMeta); err != nil {
return FileInfoVersions{}, errFileCorrupt
}
fi, err := xlMeta.ToFileInfo(volume, path)
if err != nil {
return FileInfoVersions{}, err
}
fi.IsLatest = true // No versions so current version is latest.
fi.XLV1 = true // indicates older version
return FileInfoVersions{
Volume: volume,
Name: path,
Versions: []FileInfo{fi},
LatestModTime: fi.ModTime,
}, nil
}
func getFileInfo(xlMetaBuf []byte, volume, path, versionID string, data bool) (FileInfo, error) {
if isXL2V1Format(xlMetaBuf) {
var xlMeta xlMetaV2
if err := xlMeta.Load(xlMetaBuf); err != nil {
return FileInfo{}, err
}
fi, err := xlMeta.ToFileInfo(volume, path, versionID)
if !data || err != nil {
return fi, err
}
versionID := fi.VersionID
if versionID == "" {
versionID = nullVersionID
}
fi.Data = xlMeta.data.find(versionID)
if len(fi.Data) == 0 {
// PR #11758 used DataDir, preserve it
// for users who might have used master
// branch
fi.Data = xlMeta.data.find(fi.DataDir)
}
return fi, nil
}
xlMeta := &xlMetaV1Object{}
var json = jsoniter.ConfigCompatibleWithStandardLibrary
if err := json.Unmarshal(xlMetaBuf, xlMeta); err != nil {
return FileInfo{}, errFileCorrupt
}
fi, err := xlMeta.ToFileInfo(volume, path)
if err == errFileNotFound && versionID != "" {
return fi, errFileVersionNotFound
}
fi.IsLatest = true // No versions so current version is latest.
fi.XLV1 = true // indicates older version
return fi, err
}
// getXLDiskLoc will return the pool/set/disk id if it can be located in the object layer.
// Will return -1 for unknown values.
func getXLDiskLoc(diskID string) (poolIdx, setIdx, diskIdx int) {
if api := newObjectLayerFn(); api != nil {
if ep, ok := api.(*erasureServerPools); ok {
if pool, set, disk, err := ep.getPoolAndSet(diskID); err == nil {
return pool, set, disk
}
}
}
return -1, -1, -1
}