diff --git a/backend/posix/posix.go b/backend/posix/posix.go
index c23aca5..1055091 100644
--- a/backend/posix/posix.go
+++ b/backend/posix/posix.go
@@ -101,7 +101,7 @@ func (p *Posix) ListBuckets() (*s3.ListBucketsOutput, error) {
 
 func (p *Posix) HeadBucket(bucket string) (*s3.HeadBucketOutput, error) {
 	_, err := os.Lstat(bucket)
-	if err != nil && errors.Is(err, fs.ErrNotExist) {
+	if errors.Is(err, fs.ErrNotExist) {
 		return nil, s3err.GetAPIError(s3err.ErrNoSuchBucket)
 	}
 	if err != nil {
@@ -125,7 +125,7 @@ func (p *Posix) PutBucket(bucket string) error {
 
 func (p *Posix) DeleteBucket(bucket string) error {
 	names, err := os.ReadDir(bucket)
-	if err != nil && errors.Is(err, fs.ErrNotExist) {
+	if errors.Is(err, fs.ErrNotExist) {
 		return s3err.GetAPIError(s3err.ErrNoSuchBucket)
 	}
 	if err != nil {
@@ -157,7 +157,7 @@ func (p *Posix) CreateMultipartUpload(mpu *s3.CreateMultipartUploadInput) (*s3.C
 	object := *mpu.Key
 
 	_, err := os.Stat(bucket)
-	if err != nil && errors.Is(err, fs.ErrNotExist) {
+	if errors.Is(err, fs.ErrNotExist) {
 		return nil, s3err.GetAPIError(s3err.ErrNoSuchBucket)
 	}
 	if err != nil {
@@ -205,7 +205,7 @@ func (p *Posix) CreateMultipartUpload(mpu *s3.CreateMultipartUploadInput) (*s3.C
 
 func (p *Posix) CompleteMultipartUpload(bucket, object, uploadID string, parts []types.Part) (*s3.CompleteMultipartUploadOutput, error) {
 	_, err := os.Stat(bucket)
-	if err != nil && errors.Is(err, fs.ErrNotExist) {
+	if errors.Is(err, fs.ErrNotExist) {
 		return nil, s3err.GetAPIError(s3err.ErrNoSuchBucket)
 	}
 	if err != nil {
@@ -322,7 +322,7 @@ func (p *Posix) checkUploadIDExists(bucket, object, uploadID string) ([32]byte,
 	objdir := filepath.Join(bucket, metaTmpMultipartDir, fmt.Sprintf("%x", sum))
 
 	_, err := os.Stat(filepath.Join(objdir, uploadID))
-	if err != nil && errors.Is(err, fs.ErrNotExist) {
+	if errors.Is(err, fs.ErrNotExist) {
 		return [32]byte{}, s3err.GetAPIError(s3err.ErrNoSuchUpload)
 	}
 	if err != nil {
@@ -470,7 +470,7 @@ func (p *Posix) AbortMultipartUpload(mpu *s3.AbortMultipartUploadInput) error {
 	uploadID := *mpu.UploadId
 
 	_, err := os.Stat(bucket)
-	if err != nil && errors.Is(err, fs.ErrNotExist) {
+	if errors.Is(err, fs.ErrNotExist) {
 		return s3err.GetAPIError(s3err.ErrNoSuchBucket)
 	}
 	if err != nil {
@@ -498,7 +498,7 @@ func (p *Posix) ListMultipartUploads(mpu *s3.ListMultipartUploadsInput) (*s3.Lis
 	bucket := *mpu.Bucket
 
 	_, err := os.Stat(bucket)
-	if err != nil && errors.Is(err, fs.ErrNotExist) {
+	if errors.Is(err, fs.ErrNotExist) {
 		return nil, s3err.GetAPIError(s3err.ErrNoSuchBucket)
 	}
 	if err != nil {
@@ -588,7 +588,7 @@ func (p *Posix) ListMultipartUploads(mpu *s3.ListMultipartUploadsInput) (*s3.Lis
 
 func (p *Posix) ListObjectParts(bucket, object, uploadID string, partNumberMarker int, maxParts int) (*s3.ListPartsOutput, error) {
 	_, err := os.Stat(bucket)
-	if err != nil && errors.Is(err, fs.ErrNotExist) {
+	if errors.Is(err, fs.ErrNotExist) {
 		return nil, s3err.GetAPIError(s3err.ErrNoSuchBucket)
 	}
 	if err != nil {
@@ -603,7 +603,7 @@ func (p *Posix) ListObjectParts(bucket, object, uploadID string, partNumberMarke
 	objdir := filepath.Join(bucket, metaTmpMultipartDir, fmt.Sprintf("%x", sum))
 
 	ents, err := os.ReadDir(filepath.Join(objdir, uploadID))
-	if err != nil && errors.Is(err, fs.ErrNotExist) {
+	if errors.Is(err, fs.ErrNotExist) {
 		return nil, s3err.GetAPIError(s3err.ErrNoSuchUpload)
 	}
 	if err != nil {
@@ -673,7 +673,7 @@ func (p *Posix) ListObjectParts(bucket, object, uploadID string, partNumberMarke
 
 func (p *Posix) PutObjectPart(bucket, object, uploadID string, part int, length int64, r io.Reader) (string, error) {
 	_, err := os.Stat(bucket)
-	if err != nil && errors.Is(err, fs.ErrNotExist) {
+	if errors.Is(err, fs.ErrNotExist) {
 		return "", s3err.GetAPIError(s3err.ErrNoSuchBucket)
 	}
 	if err != nil {
@@ -711,7 +711,7 @@ func (p *Posix) PutObjectPart(bucket, object, uploadID string, part int, length
 
 func (p *Posix) PutObject(po *s3.PutObjectInput) (string, error) {
 	_, err := os.Stat(*po.Bucket)
-	if err != nil && errors.Is(err, fs.ErrNotExist) {
+	if errors.Is(err, fs.ErrNotExist) {
 		return "", s3err.GetAPIError(s3err.ErrNoSuchBucket)
 	}
 	if err != nil {
@@ -783,7 +783,7 @@ func (p *Posix) PutObject(po *s3.PutObjectInput) (string, error) {
 
 func (p *Posix) DeleteObject(bucket, object string) error {
 	_, err := os.Stat(bucket)
-	if err != nil && errors.Is(err, fs.ErrNotExist) {
+	if errors.Is(err, fs.ErrNotExist) {
 		return s3err.GetAPIError(s3err.ErrNoSuchBucket)
 	}
 	if err != nil {
@@ -791,7 +791,7 @@ func (p *Posix) DeleteObject(bucket, object string) error {
 	}
 
 	os.Remove(filepath.Join(bucket, object))
-	if err != nil && errors.Is(err, fs.ErrNotExist) {
+	if errors.Is(err, fs.ErrNotExist) {
 		return s3err.GetAPIError(s3err.ErrNoSuchKey)
 	}
 	if err != nil {
@@ -845,7 +845,7 @@ func (p *Posix) DeleteObjects(bucket string, objects *s3.DeleteObjectsInput) err
 
 func (p *Posix) GetObject(bucket, object, acceptRange string, startOffset, length int64, writer io.Writer) (*s3.GetObjectOutput, error) {
 	_, err := os.Stat(bucket)
-	if err != nil && errors.Is(err, fs.ErrNotExist) {
+	if errors.Is(err, fs.ErrNotExist) {
 		return nil, s3err.GetAPIError(s3err.ErrNoSuchBucket)
 	}
 	if err != nil {
@@ -854,7 +854,7 @@ func (p *Posix) GetObject(bucket, object, acceptRange string, startOffset, lengt
 
 	objPath := filepath.Join(bucket, object)
 	fi, err := os.Stat(objPath)
-	if err != nil && errors.Is(err, fs.ErrNotExist) {
+	if errors.Is(err, fs.ErrNotExist) {
 		return nil, s3err.GetAPIError(s3err.ErrNoSuchKey)
 	}
 	if err != nil {
@@ -867,7 +867,7 @@ func (p *Posix) GetObject(bucket, object, acceptRange string, startOffset, lengt
 	}
 
 	f, err := os.Open(objPath)
-	if err != nil && errors.Is(err, fs.ErrNotExist) {
+	if errors.Is(err, fs.ErrNotExist) {
 		return nil, s3err.GetAPIError(s3err.ErrNoSuchKey)
 	}
 	if err != nil {
@@ -910,7 +910,7 @@ func (p *Posix) GetObject(bucket, object, acceptRange string, startOffset, lengt
 
 func (p *Posix) HeadObject(bucket, object string) (*s3.HeadObjectOutput, error) {
 	_, err := os.Stat(bucket)
-	if err != nil && errors.Is(err, fs.ErrNotExist) {
+	if errors.Is(err, fs.ErrNotExist) {
 		return nil, s3err.GetAPIError(s3err.ErrNoSuchBucket)
 	}
 	if err != nil {
@@ -919,7 +919,7 @@ func (p *Posix) HeadObject(bucket, object string) (*s3.HeadObjectOutput, error)
 
 	objPath := filepath.Join(bucket, object)
 	fi, err := os.Stat(objPath)
-	if err != nil && errors.Is(err, fs.ErrNotExist) {
+	if errors.Is(err, fs.ErrNotExist) {
 		return nil, s3err.GetAPIError(s3err.ErrNoSuchKey)
 	}
 	if err != nil {
@@ -947,7 +947,7 @@ func (p *Posix) HeadObject(bucket, object string) (*s3.HeadObjectOutput, error)
 
 func (p *Posix) CopyObject(srcBucket, srcObject, DstBucket, dstObject string) (*s3.CopyObjectOutput, error) {
 	_, err := os.Stat(srcBucket)
-	if err != nil && errors.Is(err, fs.ErrNotExist) {
+	if errors.Is(err, fs.ErrNotExist) {
 		return nil, s3err.GetAPIError(s3err.ErrNoSuchBucket)
 	}
 	if err != nil {
@@ -955,7 +955,7 @@ func (p *Posix) CopyObject(srcBucket, srcObject, DstBucket, dstObject string) (*
 	}
 
 	_, err = os.Stat(DstBucket)
-	if err != nil && errors.Is(err, fs.ErrNotExist) {
+	if errors.Is(err, fs.ErrNotExist) {
 		return nil, s3err.GetAPIError(s3err.ErrNoSuchBucket)
 	}
 	if err != nil {
@@ -964,7 +964,7 @@ func (p *Posix) CopyObject(srcBucket, srcObject, DstBucket, dstObject string) (*
 
 	objPath := filepath.Join(srcBucket, srcObject)
 	f, err := os.Open(objPath)
-	if err != nil && errors.Is(err, fs.ErrNotExist) {
+	if errors.Is(err, fs.ErrNotExist) {
 		return nil, s3err.GetAPIError(s3err.ErrNoSuchKey)
 	}
 	if err != nil {
@@ -992,7 +992,7 @@ func (p *Posix) CopyObject(srcBucket, srcObject, DstBucket, dstObject string) (*
 
 func (p *Posix) ListObjects(bucket, prefix, marker, delim string, maxkeys int) (*s3.ListObjectsOutput, error) {
 	_, err := os.Stat(bucket)
-	if err != nil && errors.Is(err, fs.ErrNotExist) {
+	if errors.Is(err, fs.ErrNotExist) {
 		return nil, s3err.GetAPIError(s3err.ErrNoSuchBucket)
 	}
 	if err != nil {
@@ -1020,7 +1020,7 @@ func (p *Posix) ListObjects(bucket, prefix, marker, delim string, maxkeys int) (
 
 func (p *Posix) ListObjectsV2(bucket, prefix, marker, delim string, maxkeys int) (*s3.ListObjectsV2Output, error) {
 	_, err := os.Stat(bucket)
-	if err != nil && errors.Is(err, fs.ErrNotExist) {
+	if errors.Is(err, fs.ErrNotExist) {
 		return nil, s3err.GetAPIError(s3err.ErrNoSuchBucket)
 	}
 	if err != nil {
@@ -1048,7 +1048,7 @@ func (p *Posix) ListObjectsV2(bucket, prefix, marker, delim string, maxkeys int)
 
 func (p *Posix) GetTags(bucket, object string) (map[string]string, error) {
 	_, err := os.Stat(bucket)
-	if err != nil && errors.Is(err, fs.ErrNotExist) {
+	if errors.Is(err, fs.ErrNotExist) {
 		return nil, s3err.GetAPIError(s3err.ErrNoSuchBucket)
 	}
 	if err != nil {
@@ -1081,7 +1081,7 @@ func (p *Posix) getXattrTags(bucket, object string) (map[string]string, error) {
 
 func (p *Posix) SetTags(bucket, object string, tags map[string]string) error {
 	_, err := os.Stat(bucket)
-	if err != nil && errors.Is(err, fs.ErrNotExist) {
+	if errors.Is(err, fs.ErrNotExist) {
 		return s3err.GetAPIError(s3err.ErrNoSuchBucket)
 	}
 	if err != nil {
@@ -1089,7 +1089,14 @@ func (p *Posix) SetTags(bucket, object string, tags map[string]string) error {
 	}
 
 	if tags == nil {
-		return xattr.Remove(filepath.Join(bucket, object), "user."+tagHdr)
+		err = xattr.Remove(filepath.Join(bucket, object), "user."+tagHdr)
+		if errors.Is(err, fs.ErrNotExist) {
+			return s3err.GetAPIError(s3err.ErrNoSuchKey)
+		}
+		if err != nil {
+			return fmt.Errorf("remove tags: %w", err)
+		}
+		return nil
 	}
 
 	b, err := json.Marshal(tags)