Detect underlying disk mount/unmount (#8408)

cmd/posix-diskid-check.go

@@ -0,0 +1,190 @@
+/*
+ * MinIO Cloud Storage, (C) 2019 MinIO, Inc.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package cmd
+
+import (
+	"io"
+)
+
+// Detects change in underlying disk.
+type posixDiskIDCheck struct {
+	storage *posix
+	diskID  string
+}
+
+func (p *posixDiskIDCheck) String() string {
+	return p.storage.String()
+}
+
+func (p *posixDiskIDCheck) IsOnline() bool {
+	storedDiskID, err := p.storage.getDiskID()
+	if err != nil {
+		return false
+	}
+	return storedDiskID == p.diskID
+}
+
+func (p *posixDiskIDCheck) LastError() error {
+	return p.storage.LastError()
+}
+
+func (p *posixDiskIDCheck) Close() error {
+	return p.storage.Close()
+}
+
+func (p *posixDiskIDCheck) SetDiskID(id string) {
+	p.diskID = id
+}
+
+func (p *posixDiskIDCheck) isDiskStale() bool {
+	if p.diskID == "" {
+		// For empty disk-id we allow the call as the server might be coming up and trying to read format.json
+		// or create format.json
+		return false
+	}
+	storedDiskID, err := p.storage.getDiskID()
+	if err == nil && p.diskID == storedDiskID {
+		return false
+	}
+	return true
+}
+
+func (p *posixDiskIDCheck) DiskInfo() (info DiskInfo, err error) {
+	if p.isDiskStale() {
+		return info, errDiskNotFound
+	}
+	return p.storage.DiskInfo()
+}
+
+func (p *posixDiskIDCheck) MakeVol(volume string) (err error) {
+	if p.isDiskStale() {
+		return errDiskNotFound
+	}
+	return p.storage.MakeVol(volume)
+}
+
+func (p *posixDiskIDCheck) ListVols() ([]VolInfo, error) {
+	if p.isDiskStale() {
+		return nil, errDiskNotFound
+	}
+	return p.storage.ListVols()
+}
+
+func (p *posixDiskIDCheck) StatVol(volume string) (vol VolInfo, err error) {
+	if p.isDiskStale() {
+		return vol, errDiskNotFound
+	}
+	return p.storage.StatVol(volume)
+}
+
+func (p *posixDiskIDCheck) DeleteVol(volume string) (err error) {
+	if p.isDiskStale() {
+		return errDiskNotFound
+	}
+	return p.storage.DeleteVol(volume)
+}
+
+func (p *posixDiskIDCheck) Walk(volume, dirPath string, marker string, recursive bool, leafFile string, readMetadataFn readMetadataFunc, endWalkCh chan struct{}) (chan FileInfo, error) {
+	if p.isDiskStale() {
+		return nil, errDiskNotFound
+	}
+	return p.storage.Walk(volume, dirPath, marker, recursive, leafFile, readMetadataFn, endWalkCh)
+}
+
+func (p *posixDiskIDCheck) ListDir(volume, dirPath string, count int, leafFile string) ([]string, error) {
+	if p.isDiskStale() {
+		return nil, errDiskNotFound
+	}
+	return p.storage.ListDir(volume, dirPath, count, leafFile)
+}
+
+func (p *posixDiskIDCheck) ReadFile(volume string, path string, offset int64, buf []byte, verifier *BitrotVerifier) (n int64, err error) {
+	if p.isDiskStale() {
+		return 0, errDiskNotFound
+	}
+	return p.storage.ReadFile(volume, path, offset, buf, verifier)
+}
+
+func (p *posixDiskIDCheck) AppendFile(volume string, path string, buf []byte) (err error) {
+	if p.isDiskStale() {
+		return errDiskNotFound
+	}
+	return p.storage.AppendFile(volume, path, buf)
+}
+
+func (p *posixDiskIDCheck) CreateFile(volume, path string, size int64, reader io.Reader) error {
+	if p.isDiskStale() {
+		return errDiskNotFound
+	}
+	return p.storage.CreateFile(volume, path, size, reader)
+}
+
+func (p *posixDiskIDCheck) ReadFileStream(volume, path string, offset, length int64) (io.ReadCloser, error) {
+	if p.isDiskStale() {
+		return nil, errDiskNotFound
+	}
+	return p.storage.ReadFileStream(volume, path, offset, length)
+}
+
+func (p *posixDiskIDCheck) RenameFile(srcVolume, srcPath, dstVolume, dstPath string) error {
+	if p.isDiskStale() {
+		return errDiskNotFound
+	}
+	return p.storage.RenameFile(srcVolume, srcPath, dstVolume, dstPath)
+}
+
+func (p *posixDiskIDCheck) StatFile(volume string, path string) (file FileInfo, err error) {
+	if p.isDiskStale() {
+		return file, errDiskNotFound
+	}
+	return p.storage.StatFile(volume, path)
+}
+
+func (p *posixDiskIDCheck) DeleteFile(volume string, path string) (err error) {
+	if p.isDiskStale() {
+		return errDiskNotFound
+	}
+	return p.storage.DeleteFile(volume, path)
+}
+
+func (p *posixDiskIDCheck) DeleteFileBulk(volume string, paths []string) (errs []error, err error) {
+	if p.isDiskStale() {
+		return nil, errDiskNotFound
+	}
+	return p.storage.DeleteFileBulk(volume, paths)
+}
+
+func (p *posixDiskIDCheck) VerifyFile(volume, path string, size int64, algo BitrotAlgorithm, sum []byte, shardSize int64) error {
+	if p.isDiskStale() {
+		return errDiskNotFound
+	}
+	return p.storage.VerifyFile(volume, path, size, algo, sum, shardSize)
+}
+
+func (p *posixDiskIDCheck) WriteAll(volume string, path string, reader io.Reader) (err error) {
+	if p.isDiskStale() {
+		return errDiskNotFound
+	}
+	return p.storage.WriteAll(volume, path, reader)
+}
+
+func (p *posixDiskIDCheck) ReadAll(volume string, path string) (buf []byte, err error) {
+	if p.isDiskStale() {
+		return nil, errDiskNotFound
+	}
+	return p.storage.ReadAll(volume, path)
+}