[#2057] blobstor: Block operations on a mode change

Signed-off-by: Pavel Karpy <carpawell@nspcc.ru>

pkg/local_object_storage/blobstor/delete.go

@@ -8,6 +8,9 @@ import (
 )
 
 func (b *BlobStor) Delete(prm common.DeletePrm) (common.DeleteRes, error) {
+	b.modeMtx.RLock()
+	defer b.modeMtx.RUnlock()
+
 	if prm.StorageID == nil {
 		for i := range b.storage {
 			res, err := b.storage[i].Storage.Delete(prm)

pkg/local_object_storage/blobstor/exists.go

@@ -10,6 +10,9 @@ import (
 // Returns any error encountered that did not allow
 // to completely check object existence.
 func (b *BlobStor) Exists(prm common.ExistsPrm) (common.ExistsRes, error) {
+	b.modeMtx.RLock()
+	defer b.modeMtx.RUnlock()
+
 	// If there was an error during existence check below,
 	// it will be returned unless object was found in blobovnicza.
 	// Otherwise, it is logged and the latest error is returned.

pkg/local_object_storage/blobstor/get.go

@@ -12,6 +12,9 @@ import (
 // If the descriptor is present, only one sub-storage is tried,
 // Otherwise, each sub-storage is tried in order.
 func (b *BlobStor) Get(prm common.GetPrm) (common.GetRes, error) {
+	b.modeMtx.RLock()
+	defer b.modeMtx.RUnlock()
+
 	if prm.StorageID == nil {
 		for i := range b.storage {
 			res, err := b.storage[i].Storage.Get(prm)

pkg/local_object_storage/blobstor/get_range.go

@@ -12,6 +12,9 @@ import (
 // If the descriptor is present, only one sub-storage is tried,
 // Otherwise, each sub-storage is tried in order.
 func (b *BlobStor) GetRange(prm common.GetRangePrm) (common.GetRangeRes, error) {
+	b.modeMtx.RLock()
+	defer b.modeMtx.RUnlock()
+
 	if prm.StorageID == nil {
 		for i := range b.storage {
 			res, err := b.storage[i].Storage.GetRange(prm)

pkg/local_object_storage/blobstor/info.go

@@ -2,6 +2,9 @@ package blobstor
 
 // DumpInfo returns information about blob stor.
 func (b *BlobStor) DumpInfo() Info {
+	b.modeMtx.RLock()
+	defer b.modeMtx.RUnlock()
+
 	sub := make([]SubStorageInfo, len(b.storage))
 	for i := range b.storage {
 		sub[i].Path = b.storage[i].Storage.Path()

pkg/local_object_storage/blobstor/iterate.go

@@ -16,6 +16,9 @@ import (
 //
 // If handler returns an error, method wraps and returns it immediately.
 func (b *BlobStor) Iterate(prm common.IteratePrm) (common.IterateRes, error) {
+	b.modeMtx.RLock()
+	defer b.modeMtx.RUnlock()
+
 	for i := range b.storage {
 		_, err := b.storage[i].Storage.Iterate(prm)
 		if err != nil && !prm.IgnoreErrors {

pkg/local_object_storage/blobstor/put.go

@@ -22,6 +22,9 @@ var ErrNoPlaceFound = logicerr.New("couldn't find a place to store an object")
 // Returns any error encountered that
 // did not allow to completely save the object.
 func (b *BlobStor) Put(prm common.PutPrm) (common.PutRes, error) {
+	b.modeMtx.RLock()
+	defer b.modeMtx.RUnlock()
+
 	if prm.Object != nil {
 		prm.Address = object.AddressOf(prm.Object)
 	}