[contrib][linux-kernel] Add zstd_min_clevel() and zstd_max_clevel()

facebook · Mar 30, 2021 · d334ad2 · d334ad2
1 parent a494308
commit d334ad2
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Showing 3 changed files with 35 additions and 0 deletions.
diff --git a/contrib/linux-kernel/linux_zstd.h b/contrib/linux-kernel/linux_zstd.h
@@ -63,6 +63,20 @@ zstd_error_code zstd_get_error_code(size_t code);
  */
 const char *zstd_get_error_name(size_t code);
 
+/**
+ * zstd_min_clevel() - minimum allowed compression level
+ *
+ * Return: The minimum allowed compression level.
+ */
+int zstd_min_clevel(void);
+
+/**
+ * zstd_max_clevel() - maximum allowed compression level
+ *
+ * Return: The maximum allowed compression level.
+ */
+int zstd_max_clevel(void);
+
 /* ======   Parameter Selection   ====== */
 
 /**

diff --git a/contrib/linux-kernel/test/test.c b/contrib/linux-kernel/test/test.c
@@ -169,6 +169,13 @@ static void test_decompress_unzstd(test_data_t const *data) {
     fprintf(stderr, "Ok\n");
 }
 
+static void test_f2fs() {
+  fprintf(stderr, "testing f2fs uses... ");
+  CONTROL(zstd_min_clevel() < 0);
+  CONTROL(zstd_max_clevel() == 22);
+  fprintf(stderr, "Ok\n");
+}
+
 static char *g_stack = NULL;
 
 static void __attribute__((noinline)) use(void *x) {
@@ -195,13 +202,15 @@ static void __attribute__((noinline)) check_stack() {
 
 static void test_stack_usage(test_data_t const *data) {
   set_stack();
+  test_f2fs();
   test_btrfs(data);
   test_decompress_unzstd(data);
   check_stack();
 }
 
 int main(void) {
   test_data_t data = create_test_data();
+  test_f2fs();
   test_btrfs(&data);
   test_decompress_unzstd(&data);
   test_stack_usage(&data);

diff --git a/contrib/linux-kernel/zstd_compress_module.c b/contrib/linux-kernel/zstd_compress_module.c
@@ -17,6 +17,18 @@
 #include "common/zstd_deps.h"
 #include "common/zstd_internal.h"
 
+int zstd_min_clevel(void)
+{
+	return ZSTD_minCLevel();
+}
+EXPORT_SYMBOL(zstd_min_clevel);
+
+int zstd_max_clevel(void)
+{
+	return ZSTD_maxCLevel();
+}
+EXPORT_SYMBOL(zstd_max_clevel);
+
 size_t zstd_compress_bound(size_t src_size)
 {
 	return ZSTD_compressBound(src_size);