From 281befec6739a0d5ff345d676059873107466bda Mon Sep 17 00:00:00 2001
From: Pavel Karpy <carpawell@nspcc.ru>
Date: Mon, 23 May 2022 17:15:16 +0300
Subject: [PATCH] [#1418] blobstor: Do not use pointers as parameters

Signed-off-by: Pavel Karpy <carpawell@nspcc.ru>
---
 .../internal/commands/inspect/inspect.go      |  2 +-
 .../blobovnicza/blobovnicza_test.go           |  4 +--
 .../blobovnicza/delete.go                     |  2 +-
 pkg/local_object_storage/blobovnicza/get.go   |  4 +--
 .../blobstor/blobovnicza.go                   | 24 ++++++++--------
 .../blobstor/blobovnicza_test.go              |  8 +++---
 .../blobstor/blobstor_test.go                 |  8 +++---
 .../blobstor/delete_big.go                    |  2 +-
 .../blobstor/delete_small.go                  |  2 +-
 pkg/local_object_storage/blobstor/exists.go   |  4 +--
 .../blobstor/exists_test.go                   |  4 +--
 .../blobstor/fstree/fstree.go                 | 10 +++----
 .../blobstor/fstree/fstree_test.go            | 28 +++++++++++++------
 pkg/local_object_storage/blobstor/get_big.go  |  2 +-
 .../blobstor/get_range_big.go                 |  2 +-
 .../blobstor/get_range_small.go               |  2 +-
 .../blobstor/get_small.go                     |  2 +-
 pkg/local_object_storage/blobstor/iterate.go  |  8 ++++--
 pkg/local_object_storage/blobstor/put.go      |  2 +-
 pkg/local_object_storage/shard/delete.go      |  4 +--
 pkg/local_object_storage/shard/exists.go      |  2 +-
 pkg/local_object_storage/shard/get.go         |  4 +--
 pkg/local_object_storage/shard/put.go         |  2 +-
 pkg/local_object_storage/shard/range.go       |  4 +--
 pkg/local_object_storage/writecache/flush.go  | 11 ++++++--
 .../writecache/iterate.go                     |  8 ++++--
 26 files changed, 89 insertions(+), 66 deletions(-)

diff --git a/cmd/neofs-lens/internal/commands/inspect/inspect.go b/cmd/neofs-lens/internal/commands/inspect/inspect.go
index 3b387c9f..85a70d1b 100644
--- a/cmd/neofs-lens/internal/commands/inspect/inspect.go
+++ b/cmd/neofs-lens/internal/commands/inspect/inspect.go
@@ -85,7 +85,7 @@ func objectInspectCmd(cmd *cobra.Command, _ []string) {
 
 	defer blz.Close()
 
-	prm := new(blobovnicza.GetPrm)
+	var prm blobovnicza.GetPrm
 	prm.SetAddress(addr)
 	res, err := blz.Get(prm)
 	common.ExitOnErr(cmd, common.Errf("could not fetch object: %w", err))
diff --git a/pkg/local_object_storage/blobovnicza/blobovnicza_test.go b/pkg/local_object_storage/blobovnicza/blobovnicza_test.go
index 16fc7ed5..7e13d382 100644
--- a/pkg/local_object_storage/blobovnicza/blobovnicza_test.go
+++ b/pkg/local_object_storage/blobovnicza/blobovnicza_test.go
@@ -36,7 +36,7 @@ func testPutGet(t *testing.T, blz *Blobovnicza, addr oid.Address, sz uint64, ass
 }
 
 func testGet(t *testing.T, blz *Blobovnicza, addr oid.Address, expObj []byte, assertErr func(error) bool) {
-	pGet := new(GetPrm)
+	var pGet GetPrm
 	pGet.SetAddress(addr)
 
 	// try to read object from Blobovnicza
@@ -85,7 +85,7 @@ func TestBlobovnicza(t *testing.T) {
 	addr := testPutGet(t, blz, oidtest.Address(), filled, nil, nil)
 
 	// remove the object
-	dPrm := new(DeletePrm)
+	var dPrm DeletePrm
 	dPrm.SetAddress(addr)
 
 	_, err := blz.Delete(dPrm)
diff --git a/pkg/local_object_storage/blobovnicza/delete.go b/pkg/local_object_storage/blobovnicza/delete.go
index 6c598e1c..6c255ec9 100644
--- a/pkg/local_object_storage/blobovnicza/delete.go
+++ b/pkg/local_object_storage/blobovnicza/delete.go
@@ -29,7 +29,7 @@ func (p *DeletePrm) SetAddress(addr oid.Address) {
 // Returns an error of type apistatus.ObjectNotFound if the object to be deleted is not in blobovnicza.
 //
 // Should not be called in read-only configuration.
-func (b *Blobovnicza) Delete(prm *DeletePrm) (*DeleteRes, error) {
+func (b *Blobovnicza) Delete(prm DeletePrm) (*DeleteRes, error) {
 	addrKey := addressKey(prm.addr)
 
 	removed := false
diff --git a/pkg/local_object_storage/blobovnicza/get.go b/pkg/local_object_storage/blobovnicza/get.go
index 661d7b20..66cc41f7 100644
--- a/pkg/local_object_storage/blobovnicza/get.go
+++ b/pkg/local_object_storage/blobovnicza/get.go
@@ -24,7 +24,7 @@ func (p *GetPrm) SetAddress(addr oid.Address) {
 }
 
 // Object returns binary representation of the requested object.
-func (p *GetRes) Object() []byte {
+func (p GetRes) Object() []byte {
 	return p.obj
 }
 
@@ -35,7 +35,7 @@ func (p *GetRes) Object() []byte {
 //
 // Returns an error of type apistatus.ObjectNotFound if the requested object is not
 // presented in Blobovnicza.
-func (b *Blobovnicza) Get(prm *GetPrm) (*GetRes, error) {
+func (b *Blobovnicza) Get(prm GetPrm) (*GetRes, error) {
 	var (
 		data    []byte
 		addrKey = addressKey(prm.addr)
diff --git a/pkg/local_object_storage/blobstor/blobovnicza.go b/pkg/local_object_storage/blobstor/blobovnicza.go
index 79552b6e..dcf396ef 100644
--- a/pkg/local_object_storage/blobstor/blobovnicza.go
+++ b/pkg/local_object_storage/blobstor/blobovnicza.go
@@ -205,8 +205,8 @@ func (b *blobovniczas) put(addr oid.Address, data []byte) (*blobovnicza.ID, erro
 //
 // If blobocvnicza ID is specified, only this blobovnicza is processed.
 // Otherwise, all blobovniczas are processed descending weight.
-func (b *blobovniczas) get(prm *GetSmallPrm) (res *GetSmallRes, err error) {
-	bPrm := new(blobovnicza.GetPrm)
+func (b *blobovniczas) get(prm GetSmallPrm) (res *GetSmallRes, err error) {
+	var bPrm blobovnicza.GetPrm
 	bPrm.SetAddress(prm.addr)
 
 	if prm.blobovniczaID != nil {
@@ -255,8 +255,8 @@ func (b *blobovniczas) get(prm *GetSmallPrm) (res *GetSmallRes, err error) {
 //
 // If blobocvnicza ID is specified, only this blobovnicza is processed.
 // Otherwise, all blobovniczas are processed descending weight.
-func (b *blobovniczas) delete(prm *DeleteSmallPrm) (res *DeleteSmallRes, err error) {
-	bPrm := new(blobovnicza.DeletePrm)
+func (b *blobovniczas) delete(prm DeleteSmallPrm) (res *DeleteSmallRes, err error) {
+	var bPrm blobovnicza.DeletePrm
 	bPrm.SetAddress(prm.addr)
 
 	if prm.blobovniczaID != nil {
@@ -310,7 +310,7 @@ func (b *blobovniczas) delete(prm *DeleteSmallPrm) (res *DeleteSmallRes, err err
 //
 // If blobocvnicza ID is specified, only this blobovnicza is processed.
 // Otherwise, all blobovniczas are processed descending weight.
-func (b *blobovniczas) getRange(prm *GetRangeSmallPrm) (res *GetRangeSmallRes, err error) {
+func (b *blobovniczas) getRange(prm GetRangeSmallPrm) (res *GetRangeSmallRes, err error) {
 	if prm.blobovniczaID != nil {
 		blz, err := b.openBlobovnicza(prm.blobovniczaID.String())
 		if err != nil {
@@ -360,7 +360,7 @@ func (b *blobovniczas) getRange(prm *GetRangeSmallPrm) (res *GetRangeSmallRes, e
 // tries to delete object from particular blobovnicza.
 //
 // returns no error if object was removed from some blobovnicza of the same level.
-func (b *blobovniczas) deleteObjectFromLevel(prm *blobovnicza.DeletePrm, blzPath string, tryActive bool, dp *DeleteSmallPrm) (*DeleteSmallRes, error) {
+func (b *blobovniczas) deleteObjectFromLevel(prm blobovnicza.DeletePrm, blzPath string, tryActive bool, dp DeleteSmallPrm) (*DeleteSmallRes, error) {
 	lvlPath := filepath.Dir(blzPath)
 
 	log := b.log.With(
@@ -423,7 +423,7 @@ func (b *blobovniczas) deleteObjectFromLevel(prm *blobovnicza.DeletePrm, blzPath
 // tries to read object from particular blobovnicza.
 //
 // returns error if object could not be read from any blobovnicza of the same level.
-func (b *blobovniczas) getObjectFromLevel(prm *blobovnicza.GetPrm, blzPath string, tryActive bool) (*GetSmallRes, error) {
+func (b *blobovniczas) getObjectFromLevel(prm blobovnicza.GetPrm, blzPath string, tryActive bool) (*GetSmallRes, error) {
 	lvlPath := filepath.Dir(blzPath)
 
 	log := b.log.With(
@@ -487,7 +487,7 @@ func (b *blobovniczas) getObjectFromLevel(prm *blobovnicza.GetPrm, blzPath strin
 // tries to read range of object payload data from particular blobovnicza.
 //
 // returns error if object could not be read from any blobovnicza of the same level.
-func (b *blobovniczas) getRangeFromLevel(prm *GetRangeSmallPrm, blzPath string, tryActive bool) (*GetRangeSmallRes, error) {
+func (b *blobovniczas) getRangeFromLevel(prm GetRangeSmallPrm, blzPath string, tryActive bool) (*GetRangeSmallRes, error) {
 	lvlPath := filepath.Dir(blzPath)
 
 	log := b.log.With(
@@ -560,7 +560,7 @@ func (b *blobovniczas) getRangeFromLevel(prm *GetRangeSmallPrm, blzPath string,
 }
 
 // removes object from blobovnicza and returns DeleteSmallRes.
-func (b *blobovniczas) deleteObject(blz *blobovnicza.Blobovnicza, prm *blobovnicza.DeletePrm, dp *DeleteSmallPrm) (*DeleteSmallRes, error) {
+func (b *blobovniczas) deleteObject(blz *blobovnicza.Blobovnicza, prm blobovnicza.DeletePrm, dp DeleteSmallPrm) (*DeleteSmallRes, error) {
 	_, err := blz.Delete(prm)
 	if err != nil {
 		return nil, err
@@ -576,7 +576,7 @@ func (b *blobovniczas) deleteObject(blz *blobovnicza.Blobovnicza, prm *blobovnic
 }
 
 // reads object from blobovnicza and returns GetSmallRes.
-func (b *blobovniczas) getObject(blz *blobovnicza.Blobovnicza, prm *blobovnicza.GetPrm) (*GetSmallRes, error) {
+func (b *blobovniczas) getObject(blz *blobovnicza.Blobovnicza, prm blobovnicza.GetPrm) (*GetSmallRes, error) {
 	res, err := blz.Get(prm)
 	if err != nil {
 		return nil, err
@@ -602,8 +602,8 @@ func (b *blobovniczas) getObject(blz *blobovnicza.Blobovnicza, prm *blobovnicza.
 }
 
 // reads range of object payload data from blobovnicza and returns GetRangeSmallRes.
-func (b *blobovniczas) getObjectRange(blz *blobovnicza.Blobovnicza, prm *GetRangeSmallPrm) (*GetRangeSmallRes, error) {
-	gPrm := new(blobovnicza.GetPrm)
+func (b *blobovniczas) getObjectRange(blz *blobovnicza.Blobovnicza, prm GetRangeSmallPrm) (*GetRangeSmallRes, error) {
+	var gPrm blobovnicza.GetPrm
 	gPrm.SetAddress(prm.addr)
 
 	// we don't use GetRange call for now since blobovnicza
diff --git a/pkg/local_object_storage/blobstor/blobovnicza_test.go b/pkg/local_object_storage/blobstor/blobovnicza_test.go
index 1e647b47..70f37cb3 100644
--- a/pkg/local_object_storage/blobstor/blobovnicza_test.go
+++ b/pkg/local_object_storage/blobstor/blobovnicza_test.go
@@ -80,7 +80,7 @@ func TestBlobovniczas(t *testing.T) {
 		require.NoError(t, err)
 
 		// get w/ blobovnicza ID
-		prm := new(GetSmallPrm)
+		var prm GetSmallPrm
 		prm.SetBlobovniczaID(id)
 		prm.SetAddress(addr)
 
@@ -96,7 +96,7 @@ func TestBlobovniczas(t *testing.T) {
 		require.Equal(t, obj, res.Object())
 
 		// get range w/ blobovnicza ID
-		rngPrm := new(GetRangeSmallPrm)
+		var rngPrm GetRangeSmallPrm
 		rngPrm.SetBlobovniczaID(id)
 		rngPrm.SetAddress(addr)
 
@@ -122,8 +122,8 @@ func TestBlobovniczas(t *testing.T) {
 		require.Equal(t, payload[off:off+ln], rngRes.RangeData())
 	}
 
-	dPrm := new(DeleteSmallPrm)
-	gPrm := new(GetSmallPrm)
+	var dPrm DeleteSmallPrm
+	var gPrm GetSmallPrm
 
 	for i := range addrList {
 		dPrm.SetAddress(addrList[i])
diff --git a/pkg/local_object_storage/blobstor/blobstor_test.go b/pkg/local_object_storage/blobstor/blobstor_test.go
index fe7b4f35..a69fe644 100644
--- a/pkg/local_object_storage/blobstor/blobstor_test.go
+++ b/pkg/local_object_storage/blobstor/blobstor_test.go
@@ -37,22 +37,22 @@ func TestCompression(t *testing.T) {
 	}
 
 	testGet := func(t *testing.T, b *BlobStor, i int) {
-		res1, err := b.GetSmall(&GetSmallPrm{address: address{object.AddressOf(smallObj[i])}})
+		res1, err := b.GetSmall(GetSmallPrm{address: address{object.AddressOf(smallObj[i])}})
 		require.NoError(t, err)
 		require.Equal(t, smallObj[i], res1.Object())
 
-		res2, err := b.GetBig(&GetBigPrm{address: address{object.AddressOf(bigObj[i])}})
+		res2, err := b.GetBig(GetBigPrm{address: address{object.AddressOf(bigObj[i])}})
 		require.NoError(t, err)
 		require.Equal(t, bigObj[i], res2.Object())
 	}
 
 	testPut := func(t *testing.T, b *BlobStor, i int) {
-		prm := new(PutPrm)
+		var prm PutPrm
 		prm.SetObject(smallObj[i])
 		_, err = b.Put(prm)
 		require.NoError(t, err)
 
-		prm = new(PutPrm)
+		prm = PutPrm{}
 		prm.SetObject(bigObj[i])
 		_, err = b.Put(prm)
 		require.NoError(t, err)
diff --git a/pkg/local_object_storage/blobstor/delete_big.go b/pkg/local_object_storage/blobstor/delete_big.go
index 3532d70b..97ce9d1d 100644
--- a/pkg/local_object_storage/blobstor/delete_big.go
+++ b/pkg/local_object_storage/blobstor/delete_big.go
@@ -22,7 +22,7 @@ type DeleteBigRes struct{}
 // to completely remove the object.
 //
 // Returns an error of type apistatus.ObjectNotFound if there is no object to delete.
-func (b *BlobStor) DeleteBig(prm *DeleteBigPrm) (*DeleteBigRes, error) {
+func (b *BlobStor) DeleteBig(prm DeleteBigPrm) (*DeleteBigRes, error) {
 	err := b.fsTree.Delete(prm.addr)
 	if errors.Is(err, fstree.ErrFileNotFound) {
 		var errNotFound apistatus.ObjectNotFound
diff --git a/pkg/local_object_storage/blobstor/delete_small.go b/pkg/local_object_storage/blobstor/delete_small.go
index e98e85f8..89b768e7 100644
--- a/pkg/local_object_storage/blobstor/delete_small.go
+++ b/pkg/local_object_storage/blobstor/delete_small.go
@@ -18,6 +18,6 @@ type DeleteSmallRes struct{}
 // to completely remove the object.
 //
 // Returns an error of type apistatus.ObjectNotFound if there is no object to delete.
-func (b *BlobStor) DeleteSmall(prm *DeleteSmallPrm) (*DeleteSmallRes, error) {
+func (b *BlobStor) DeleteSmall(prm DeleteSmallPrm) (*DeleteSmallRes, error) {
 	return b.blobovniczas.delete(prm)
 }
diff --git a/pkg/local_object_storage/blobstor/exists.go b/pkg/local_object_storage/blobstor/exists.go
index 54413871..aaf4ab28 100644
--- a/pkg/local_object_storage/blobstor/exists.go
+++ b/pkg/local_object_storage/blobstor/exists.go
@@ -29,7 +29,7 @@ func (r ExistsRes) Exists() bool {
 //
 // Returns any error encountered that did not allow
 // to completely check object existence.
-func (b *BlobStor) Exists(prm *ExistsPrm) (*ExistsRes, error) {
+func (b *BlobStor) Exists(prm ExistsPrm) (*ExistsRes, error) {
 	// check presence in shallow dir first (cheaper)
 	exists, err := b.existsBig(prm.addr)
 
@@ -81,7 +81,7 @@ func (b *BlobStor) existsSmall(addr oid.Address) (bool, error) {
 func (b *blobovniczas) existsSmall(addr oid.Address) (bool, error) {
 	activeCache := make(map[string]struct{})
 
-	prm := new(blobovnicza.GetPrm)
+	var prm blobovnicza.GetPrm
 	prm.SetAddress(addr)
 
 	var found bool
diff --git a/pkg/local_object_storage/blobstor/exists_test.go b/pkg/local_object_storage/blobstor/exists_test.go
index 98bcf0c5..8af0c59a 100644
--- a/pkg/local_object_storage/blobstor/exists_test.go
+++ b/pkg/local_object_storage/blobstor/exists_test.go
@@ -30,13 +30,13 @@ func TestExists(t *testing.T) {
 	}
 
 	for i := range objects {
-		prm := new(PutPrm)
+		var prm PutPrm
 		prm.SetObject(objects[i])
 		_, err = b.Put(prm)
 		require.NoError(t, err)
 	}
 
-	prm := new(ExistsPrm)
+	var prm ExistsPrm
 	for i := range objects {
 		prm.SetAddress(objectCore.AddressOf(objects[i]))
 
diff --git a/pkg/local_object_storage/blobstor/fstree/fstree.go b/pkg/local_object_storage/blobstor/fstree/fstree.go
index d93fe63d..c923d6b6 100644
--- a/pkg/local_object_storage/blobstor/fstree/fstree.go
+++ b/pkg/local_object_storage/blobstor/fstree/fstree.go
@@ -75,23 +75,21 @@ type IterationPrm struct {
 }
 
 // WithHandler sets a function to call on each object.
-func (p *IterationPrm) WithHandler(f func(addr oid.Address, data []byte) error) *IterationPrm {
+func (p *IterationPrm) WithHandler(f func(addr oid.Address, data []byte) error) {
 	p.handler = f
-	return p
 }
 
 // WithIgnoreErrors sets a flag indicating whether errors should be ignored.
-func (p *IterationPrm) WithIgnoreErrors(ignore bool) *IterationPrm {
+func (p *IterationPrm) WithIgnoreErrors(ignore bool) {
 	p.ignoreErrors = ignore
-	return p
 }
 
 // Iterate iterates over all stored objects.
-func (t *FSTree) Iterate(prm *IterationPrm) error {
+func (t *FSTree) Iterate(prm IterationPrm) error {
 	return t.iterate(0, []string{t.RootPath}, prm)
 }
 
-func (t *FSTree) iterate(depth int, curPath []string, prm *IterationPrm) error {
+func (t *FSTree) iterate(depth int, curPath []string, prm IterationPrm) error {
 	curName := strings.Join(curPath[1:], "")
 	des, err := os.ReadDir(filepath.Join(curPath...))
 	if err != nil {
diff --git a/pkg/local_object_storage/blobstor/fstree/fstree_test.go b/pkg/local_object_storage/blobstor/fstree/fstree_test.go
index 7b319006..d2bfefaa 100644
--- a/pkg/local_object_storage/blobstor/fstree/fstree_test.go
+++ b/pkg/local_object_storage/blobstor/fstree/fstree_test.go
@@ -73,13 +73,16 @@ func TestFSTree(t *testing.T) {
 
 	t.Run("iterate", func(t *testing.T) {
 		n := 0
-		err := fs.Iterate(new(IterationPrm).WithHandler(func(addr oid.Address, data []byte) error {
+		var iterationPrm IterationPrm
+		iterationPrm.WithHandler(func(addr oid.Address, data []byte) error {
 			n++
 			expected, ok := store[addr.EncodeToString()]
 			require.True(t, ok, "object %s was not found", addr.EncodeToString())
 			require.Equal(t, data, expected)
 			return nil
-		}))
+		})
+
+		err := fs.Iterate(iterationPrm)
 
 		require.NoError(t, err)
 		require.Equal(t, count, n)
@@ -87,12 +90,15 @@ func TestFSTree(t *testing.T) {
 		t.Run("leave early", func(t *testing.T) {
 			n := 0
 			errStop := errors.New("stop")
-			err := fs.Iterate(new(IterationPrm).WithHandler(func(addr oid.Address, data []byte) error {
+
+			iterationPrm.WithHandler(func(addr oid.Address, data []byte) error {
 				if n++; n == count-1 {
 					return errStop
 				}
 				return nil
-			}))
+			})
+
+			err := fs.Iterate(iterationPrm)
 
 			require.ErrorIs(t, err, errStop)
 			require.Equal(t, count-1, n)
@@ -114,23 +120,29 @@ func TestFSTree(t *testing.T) {
 			require.NoError(t, util.MkdirAllX(filepath.Dir(p), fs.Permissions))
 			require.NoError(t, os.WriteFile(p, []byte{1, 2, 3}, fs.Permissions))
 
-			err := fs.Iterate(new(IterationPrm).WithHandler(func(addr oid.Address, data []byte) error {
+			iterationPrm.WithIgnoreErrors(true)
+			iterationPrm.WithHandler(func(addr oid.Address, data []byte) error {
 				n++
 				return nil
-			}).WithIgnoreErrors(true))
+			})
+
+			err := fs.Iterate(iterationPrm)
 			require.NoError(t, err)
 			require.Equal(t, count, n)
 
 			t.Run("error from handler is returned", func(t *testing.T) {
 				expectedErr := errors.New("expected error")
 				n := 0
-				err := fs.Iterate(new(IterationPrm).WithHandler(func(addr oid.Address, data []byte) error {
+
+				iterationPrm.WithHandler(func(addr oid.Address, data []byte) error {
 					n++
 					if n == count/2 { // process some iterations
 						return expectedErr
 					}
 					return nil
-				}).WithIgnoreErrors(true))
+				})
+
+				err := fs.Iterate(iterationPrm)
 				require.ErrorIs(t, err, expectedErr)
 				require.Equal(t, count/2, n)
 			})
diff --git a/pkg/local_object_storage/blobstor/get_big.go b/pkg/local_object_storage/blobstor/get_big.go
index 55767b97..049a0b1b 100644
--- a/pkg/local_object_storage/blobstor/get_big.go
+++ b/pkg/local_object_storage/blobstor/get_big.go
@@ -26,7 +26,7 @@ type GetBigRes struct {
 //
 // Returns an error of type apistatus.ObjectNotFound if the requested object is not
 // presented in shallow dir.
-func (b *BlobStor) GetBig(prm *GetBigPrm) (*GetBigRes, error) {
+func (b *BlobStor) GetBig(prm GetBigPrm) (*GetBigRes, error) {
 	// get compressed object data
 	data, err := b.fsTree.Get(prm.addr)
 	if err != nil {
diff --git a/pkg/local_object_storage/blobstor/get_range_big.go b/pkg/local_object_storage/blobstor/get_range_big.go
index 9adddacd..a66f133b 100644
--- a/pkg/local_object_storage/blobstor/get_range_big.go
+++ b/pkg/local_object_storage/blobstor/get_range_big.go
@@ -28,7 +28,7 @@ type GetRangeBigRes struct {
 //
 // Returns ErrRangeOutOfBounds if the requested object range is out of bounds.
 // Returns an error of type apistatus.ObjectNotFound if object is missing.
-func (b *BlobStor) GetRangeBig(prm *GetRangeBigPrm) (*GetRangeBigRes, error) {
+func (b *BlobStor) GetRangeBig(prm GetRangeBigPrm) (*GetRangeBigRes, error) {
 	// get compressed object data
 	data, err := b.fsTree.Get(prm.addr)
 	if err != nil {
diff --git a/pkg/local_object_storage/blobstor/get_range_small.go b/pkg/local_object_storage/blobstor/get_range_small.go
index 94220fb2..06abea42 100644
--- a/pkg/local_object_storage/blobstor/get_range_small.go
+++ b/pkg/local_object_storage/blobstor/get_range_small.go
@@ -22,6 +22,6 @@ type GetRangeSmallRes struct {
 //
 // Returns ErrRangeOutOfBounds if the requested object range is out of bounds.
 // Returns an error of type apistatus.ObjectNotFound if the requested object is missing in blobovnicza(s).
-func (b *BlobStor) GetRangeSmall(prm *GetRangeSmallPrm) (*GetRangeSmallRes, error) {
+func (b *BlobStor) GetRangeSmall(prm GetRangeSmallPrm) (*GetRangeSmallRes, error) {
 	return b.blobovniczas.getRange(prm)
 }
diff --git a/pkg/local_object_storage/blobstor/get_small.go b/pkg/local_object_storage/blobstor/get_small.go
index 231d0229..e8d85c19 100644
--- a/pkg/local_object_storage/blobstor/get_small.go
+++ b/pkg/local_object_storage/blobstor/get_small.go
@@ -20,6 +20,6 @@ type GetSmallRes struct {
 // did not allow to completely read the object.
 //
 // Returns an error of type apistatus.ObjectNotFound if the requested object is missing in blobovnicza(s).
-func (b *BlobStor) GetSmall(prm *GetSmallPrm) (*GetSmallRes, error) {
+func (b *BlobStor) GetSmall(prm GetSmallPrm) (*GetSmallRes, error) {
 	return b.blobovniczas.get(prm)
 }
diff --git a/pkg/local_object_storage/blobstor/iterate.go b/pkg/local_object_storage/blobstor/iterate.go
index f525262a..95e0ac50 100644
--- a/pkg/local_object_storage/blobstor/iterate.go
+++ b/pkg/local_object_storage/blobstor/iterate.go
@@ -88,7 +88,9 @@ func (b *BlobStor) Iterate(prm IteratePrm) (*IterateRes, error) {
 
 	elem.blzID = nil
 
-	err = b.fsTree.Iterate(new(fstree.IterationPrm).WithHandler(func(_ oid.Address, data []byte) error {
+	var fsPrm fstree.IterationPrm
+	fsPrm.WithIgnoreErrors(prm.ignoreErrors)
+	fsPrm.WithHandler(func(_ oid.Address, data []byte) error {
 		// decompress the data
 		elem.data, err = b.decompressor(data)
 		if err != nil {
@@ -99,7 +101,9 @@ func (b *BlobStor) Iterate(prm IteratePrm) (*IterateRes, error) {
 		}
 
 		return prm.handler(elem)
-	}).WithIgnoreErrors(prm.ignoreErrors))
+	})
+
+	err = b.fsTree.Iterate(fsPrm)
 
 	if err != nil {
 		return nil, fmt.Errorf("fs tree iterator failure: %w", err)
diff --git a/pkg/local_object_storage/blobstor/put.go b/pkg/local_object_storage/blobstor/put.go
index 289840e0..590a78cc 100644
--- a/pkg/local_object_storage/blobstor/put.go
+++ b/pkg/local_object_storage/blobstor/put.go
@@ -30,7 +30,7 @@ type PutRes struct {
 //
 // Returns any error encountered that
 // did not allow to completely save the object.
-func (b *BlobStor) Put(prm *PutPrm) (*PutRes, error) {
+func (b *BlobStor) Put(prm PutPrm) (*PutRes, error) {
 	// marshal object
 	data, err := prm.obj.Marshal()
 	if err != nil {
diff --git a/pkg/local_object_storage/shard/delete.go b/pkg/local_object_storage/shard/delete.go
index 762000e0..5bf8cb71 100644
--- a/pkg/local_object_storage/shard/delete.go
+++ b/pkg/local_object_storage/shard/delete.go
@@ -34,8 +34,8 @@ func (s *Shard) Delete(prm DeletePrm) (*DeleteRes, error) {
 	}
 
 	ln := len(prm.addr)
-	delSmallPrm := new(blobstor.DeleteSmallPrm)
-	delBigPrm := new(blobstor.DeleteBigPrm)
+	var delSmallPrm blobstor.DeleteSmallPrm
+	var delBigPrm blobstor.DeleteBigPrm
 
 	smalls := make(map[oid.Address]*blobovnicza.ID, ln)
 
diff --git a/pkg/local_object_storage/shard/exists.go b/pkg/local_object_storage/shard/exists.go
index 4b340e74..3ad35b9f 100644
--- a/pkg/local_object_storage/shard/exists.go
+++ b/pkg/local_object_storage/shard/exists.go
@@ -43,7 +43,7 @@ func (s *Shard) Exists(prm ExistsPrm) (*ExistsRes, error) {
 		// If the shard is in degraded mode, try to consult blobstor directly.
 		// Otherwise, just return an error.
 		if s.GetMode() == ModeDegraded {
-			p := new(blobstor.ExistsPrm)
+			var p blobstor.ExistsPrm
 			p.SetAddress(prm.addr)
 
 			res, bErr := s.blobStor.Exists(p)
diff --git a/pkg/local_object_storage/shard/get.go b/pkg/local_object_storage/shard/get.go
index df4a9397..b20ff2b2 100644
--- a/pkg/local_object_storage/shard/get.go
+++ b/pkg/local_object_storage/shard/get.go
@@ -67,7 +67,7 @@ func (s *Shard) Get(prm GetPrm) (*GetRes, error) {
 	var big, small storFetcher
 
 	big = func(stor *blobstor.BlobStor, _ *blobovnicza.ID) (*objectSDK.Object, error) {
-		getBigPrm := new(blobstor.GetBigPrm)
+		var getBigPrm blobstor.GetBigPrm
 		getBigPrm.SetAddress(prm.addr)
 
 		res, err := stor.GetBig(getBigPrm)
@@ -79,7 +79,7 @@ func (s *Shard) Get(prm GetPrm) (*GetRes, error) {
 	}
 
 	small = func(stor *blobstor.BlobStor, id *blobovnicza.ID) (*objectSDK.Object, error) {
-		getSmallPrm := new(blobstor.GetSmallPrm)
+		var getSmallPrm blobstor.GetSmallPrm
 		getSmallPrm.SetAddress(prm.addr)
 		getSmallPrm.SetBlobovniczaID(id)
 
diff --git a/pkg/local_object_storage/shard/put.go b/pkg/local_object_storage/shard/put.go
index 55c54b0b..36dc7a3a 100644
--- a/pkg/local_object_storage/shard/put.go
+++ b/pkg/local_object_storage/shard/put.go
@@ -35,7 +35,7 @@ func (s *Shard) Put(prm PutPrm) (*PutRes, error) {
 		return nil, ErrReadOnlyMode
 	}
 
-	putPrm := new(blobstor.PutPrm) // form Put parameters
+	var putPrm blobstor.PutPrm // form Put parameters
 	putPrm.SetObject(prm.obj)
 
 	// exist check are not performed there, these checks should be executed
diff --git a/pkg/local_object_storage/shard/range.go b/pkg/local_object_storage/shard/range.go
index e09154ac..7c804f32 100644
--- a/pkg/local_object_storage/shard/range.go
+++ b/pkg/local_object_storage/shard/range.go
@@ -74,7 +74,7 @@ func (s *Shard) GetRange(prm RngPrm) (*RngRes, error) {
 	rng.SetLength(prm.ln)
 
 	big = func(stor *blobstor.BlobStor, _ *blobovnicza.ID) (*object.Object, error) {
-		getRngBigPrm := new(blobstor.GetRangeBigPrm)
+		var getRngBigPrm blobstor.GetRangeBigPrm
 		getRngBigPrm.SetAddress(prm.addr)
 		getRngBigPrm.SetRange(rng)
 
@@ -90,7 +90,7 @@ func (s *Shard) GetRange(prm RngPrm) (*RngRes, error) {
 	}
 
 	small = func(stor *blobstor.BlobStor, id *blobovnicza.ID) (*object.Object, error) {
-		getRngSmallPrm := new(blobstor.GetRangeSmallPrm)
+		var getRngSmallPrm blobstor.GetRangeSmallPrm
 		getRngSmallPrm.SetAddress(prm.addr)
 		getRngSmallPrm.SetRange(rng)
 		getRngSmallPrm.SetBlobovniczaID(id)
diff --git a/pkg/local_object_storage/writecache/flush.go b/pkg/local_object_storage/writecache/flush.go
index cc94634d..fa1ac903 100644
--- a/pkg/local_object_storage/writecache/flush.go
+++ b/pkg/local_object_storage/writecache/flush.go
@@ -133,7 +133,9 @@ func (c *cache) flushBigObjects() {
 			}
 
 			evictNum := 0
-			_ = c.fsTree.Iterate(new(fstree.IterationPrm).WithHandler(func(addr oid.Address, data []byte) error {
+
+			var prm fstree.IterationPrm
+			prm.WithHandler(func(addr oid.Address, data []byte) error {
 				sAddr := addr.EncodeToString()
 
 				if _, ok := c.store.flushed.Peek(sAddr); ok {
@@ -161,7 +163,9 @@ func (c *cache) flushBigObjects() {
 				evictNum++
 
 				return nil
-			}))
+			})
+
+			_ = c.fsTree.Iterate(prm)
 
 			// evict objects which were successfully written to BlobStor
 			c.evictObjects(evictNum)
@@ -215,8 +219,9 @@ func (c *cache) writeObject(obj *object.Object, metaOnly bool) error {
 	var id *blobovnicza.ID
 
 	if !metaOnly {
-		prm := new(blobstor.PutPrm)
+		var prm blobstor.PutPrm
 		prm.SetObject(obj)
+
 		res, err := c.blobstor.Put(prm)
 		if err != nil {
 			return err
diff --git a/pkg/local_object_storage/writecache/iterate.go b/pkg/local_object_storage/writecache/iterate.go
index 9b810b51..c17cd77b 100644
--- a/pkg/local_object_storage/writecache/iterate.go
+++ b/pkg/local_object_storage/writecache/iterate.go
@@ -51,12 +51,16 @@ func (c *cache) Iterate(prm IterationPrm) error {
 		return err
 	}
 
-	return c.fsTree.Iterate(new(fstree.IterationPrm).WithHandler(func(addr oid.Address, data []byte) error {
+	var fsPrm fstree.IterationPrm
+	fsPrm.WithIgnoreErrors(prm.ignoreErrors)
+	fsPrm.WithHandler(func(addr oid.Address, data []byte) error {
 		if _, ok := c.flushed.Peek(addr.EncodeToString()); ok {
 			return nil
 		}
 		return prm.handler(data)
-	}).WithIgnoreErrors(prm.ignoreErrors))
+	})
+
+	return c.fsTree.Iterate(fsPrm)
 }
 
 // IterateDB iterates over all objects stored in bbolt.DB instance and passes them to f until error return.