diff --git a/changelog/unreleased/quota-stubs.md b/changelog/unreleased/quota-stubs.md
new file mode 100644
index 0000000000..cc122f0354
--- /dev/null
+++ b/changelog/unreleased/quota-stubs.md
@@ -0,0 +1,5 @@
+Bugfix: Add quota stubs
+
+The `owncloud` and `owncloudsql` drivers now read the available quota from disk to no longer always return 0, which causes the web UI to disable uploads.
+
+https://github.com/cs3org/reva/pull/1985
\ No newline at end of file
diff --git a/pkg/storage/fs/owncloud/owncloud.go b/pkg/storage/fs/owncloud/owncloud.go
index c525af5021..0bd4c2c28c 100644
--- a/pkg/storage/fs/owncloud/owncloud.go
+++ b/pkg/storage/fs/owncloud/owncloud.go
@@ -1119,10 +1119,6 @@ func (fs *ocfs) UpdateGrant(ctx context.Context, ref *provider.Reference, g *pro
 	return fs.propagate(ctx, ip)
 }
 
-func (fs *ocfs) GetQuota(ctx context.Context) (uint64, uint64, error) {
-	return 0, 0, nil
-}
-
 func (fs *ocfs) CreateHome(ctx context.Context) error {
 	u, ok := user.ContextGetUser(ctx)
 	if !ok {
diff --git a/pkg/storage/fs/owncloud/owncloud_unix.go b/pkg/storage/fs/owncloud/owncloud_unix.go
index 52e0088836..11c82f1f6c 100755
--- a/pkg/storage/fs/owncloud/owncloud_unix.go
+++ b/pkg/storage/fs/owncloud/owncloud_unix.go
@@ -66,3 +66,17 @@ func calcEtag(ctx context.Context, fi os.FileInfo) string {
 	etag := fmt.Sprintf(`"%x"`, h.Sum(nil))
 	return fmt.Sprintf("\"%s\"", strings.Trim(etag, "\""))
 }
+
+func (fs *ocfs) GetQuota(ctx context.Context) (uint64, uint64, error) {
+	// TODO quota of which storage space?
+	// we could use the logged in user, but when a user has access to multiple storages this falls short
+	// for now return quota of root
+	stat := syscall.Statfs_t{}
+	err := syscall.Statfs(fs.toInternalPath(ctx, "/"), &stat)
+	if err != nil {
+		return 0, 0, err
+	}
+	total := stat.Blocks * uint64(stat.Bsize)                // Total data blocks in filesystem
+	used := (stat.Blocks - stat.Bavail) * uint64(stat.Bsize) // Free blocks available to unprivileged user
+	return total, used, nil
+}
diff --git a/pkg/storage/fs/owncloud/owncloud_windows.go b/pkg/storage/fs/owncloud/owncloud_windows.go
index 29b93dc72c..b925d6a3ee 100644
--- a/pkg/storage/fs/owncloud/owncloud_windows.go
+++ b/pkg/storage/fs/owncloud/owncloud_windows.go
@@ -52,3 +52,22 @@ func calcEtag(ctx context.Context, fi os.FileInfo) string {
 	etag := fmt.Sprintf(`"%x"`, h.Sum(nil))
 	return fmt.Sprintf("\"%s\"", strings.Trim(etag, "\""))
 }
+
+func (fs *ocfs) GetQuota(ctx context.Context) (uint64, uint64, error) {
+	// TODO quota of which storage space?
+	// we could use the logged in user, but when a user has access to multiple storages this falls short
+	// for now return quota of root
+	var free, total, avail uint64
+
+	pathPtr, err := windows.UTF16PtrFromString(fs.toInternalPath(ctx, "/"))
+	if err != nil {
+		return 0, 0, err
+	}
+	err = windows.GetDiskFreeSpaceEx(pathPtr, &avail, &total, &free)
+	if err != nil {
+		return 0, 0, err
+	}
+
+	used := total - free
+	return total, used, nil
+}
diff --git a/pkg/storage/fs/owncloudsql/owncloudsql.go b/pkg/storage/fs/owncloudsql/owncloudsql.go
index 067bc7d92b..e534d9a407 100644
--- a/pkg/storage/fs/owncloudsql/owncloudsql.go
+++ b/pkg/storage/fs/owncloudsql/owncloudsql.go
@@ -647,10 +647,6 @@ func (fs *owncloudsqlfs) UpdateGrant(ctx context.Context, ref *provider.Referenc
 	return nil // nop
 }
 
-func (fs *owncloudsqlfs) GetQuota(ctx context.Context) (uint64, uint64, error) {
-	return 0, 0, nil
-}
-
 func (fs *owncloudsqlfs) CreateHome(ctx context.Context) error {
 	u, ok := user.ContextGetUser(ctx)
 	if !ok {
diff --git a/pkg/storage/fs/owncloudsql/owncloudsql_unix.go b/pkg/storage/fs/owncloudsql/owncloudsql_unix.go
index 440e2c98ff..9e5c1ad9ff 100755
--- a/pkg/storage/fs/owncloudsql/owncloudsql_unix.go
+++ b/pkg/storage/fs/owncloudsql/owncloudsql_unix.go
@@ -66,3 +66,17 @@ func calcEtag(ctx context.Context, fi os.FileInfo) string {
 	etag := fmt.Sprintf("%x", h.Sum(nil))
 	return strings.Trim(etag, "\"")
 }
+
+func (fs *owncloudsqlfs) GetQuota(ctx context.Context) (uint64, uint64, error) {
+	// TODO quota of which storage space?
+	// we could use the logged in user, but when a user has access to multiple storages this falls short
+	// for now return quota of root
+	stat := syscall.Statfs_t{}
+	err := syscall.Statfs(fs.toInternalPath(ctx, "/"), &stat)
+	if err != nil {
+		return 0, 0, err
+	}
+	total := stat.Blocks * uint64(stat.Bsize)                // Total data blocks in filesystem
+	used := (stat.Blocks - stat.Bavail) * uint64(stat.Bsize) // Free blocks available to unprivileged user
+	return total, used, nil
+}
diff --git a/pkg/storage/fs/owncloudsql/owncloudsql_windows.go b/pkg/storage/fs/owncloudsql/owncloudsql_windows.go
index 847de9a0f0..dc4dd873d5 100644
--- a/pkg/storage/fs/owncloudsql/owncloudsql_windows.go
+++ b/pkg/storage/fs/owncloudsql/owncloudsql_windows.go
@@ -52,3 +52,22 @@ func calcEtag(ctx context.Context, fi os.FileInfo) string {
 	etag := fmt.Sprintf(`"%x"`, h.Sum(nil))
 	return fmt.Sprintf("\"%s\"", strings.Trim(etag, "\""))
 }
+
+func (fs *owncloudsqlfs) GetQuota(ctx context.Context) (uint64, uint64, error) {
+	// TODO quota of which storage space?
+	// we could use the logged in user, but when a user has access to multiple storages this falls short
+	// for now return quota of root
+	var free, total, avail uint64
+
+	pathPtr, err := windows.UTF16PtrFromString(fs.toInternalPath(ctx, "/"))
+	if err != nil {
+		return 0, 0, err
+	}
+	err = windows.GetDiskFreeSpaceEx(pathPtr, &avail, &total, &free)
+	if err != nil {
+		return 0, 0, err
+	}
+
+	used := total - free
+	return total, used, nil
+}