Import Mbed OS hard-float snapshot

storage/filesystem/littlefsv2/littlefs/bd/lfs2_testbd.h

@@ -0,0 +1,141 @@
+/*
+ * Testing block device, wraps filebd and rambd while providing a bunch
+ * of hooks for testing littlefs in various conditions.
+ *
+ * Copyright (c) 2017, Arm Limited. All rights reserved.
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+#ifndef LFS2_TESTBD_H
+#define LFS2_TESTBD_H
+
+#include "lfs2.h"
+#include "lfs2_util.h"
+#include "bd/lfs2_rambd.h"
+#include "bd/lfs2_filebd.h"
+
+#ifdef __cplusplus
+extern "C"
+{
+#endif
+
+
+// Block device specific tracing
+#ifdef LFS2_TESTBD_YES_TRACE
+#define LFS2_TESTBD_TRACE(...) LFS2_TRACE(__VA_ARGS__)
+#else
+#define LFS2_TESTBD_TRACE(...)
+#endif
+
+// Mode determining how "bad blocks" behave during testing. This simulates
+// some real-world circumstances such as progs not sticking (prog-noop),
+// a readonly disk (erase-noop), and ECC failures (read-error).
+//
+// Not that read-noop is not allowed. Read _must_ return a consistent (but
+// may be arbitrary) value on every read.
+enum lfs2_testbd_badblock_behavior {
+    LFS2_TESTBD_BADBLOCK_PROGERROR,
+    LFS2_TESTBD_BADBLOCK_ERASEERROR,
+    LFS2_TESTBD_BADBLOCK_READERROR,
+    LFS2_TESTBD_BADBLOCK_PROGNOOP,
+    LFS2_TESTBD_BADBLOCK_ERASENOOP,
+};
+
+// Type for measuring wear
+typedef uint32_t lfs2_testbd_wear_t;
+typedef int32_t  lfs2_testbd_swear_t;
+
+// testbd config, this is required for testing
+struct lfs2_testbd_config {
+    // 8-bit erase value to use for simulating erases. -1 does not simulate
+    // erases, which can speed up testing by avoiding all the extra block-device
+    // operations to store the erase value.
+    int32_t erase_value;
+
+    // Number of erase cycles before a block becomes "bad". The exact behavior
+    // of bad blocks is controlled by the badblock_mode.
+    uint32_t erase_cycles;
+
+    // The mode determining how bad blocks fail
+    uint8_t badblock_behavior;
+
+    // Number of write operations (erase/prog) before forcefully killing
+    // the program with exit. Simulates power-loss. 0 disables.
+    uint32_t power_cycles;
+
+    // Optional buffer for RAM block device.
+    void *buffer;
+
+    // Optional buffer for wear
+    void *wear_buffer;
+};
+
+// testbd state
+typedef struct lfs2_testbd {
+    union {
+        struct {
+            lfs2_filebd_t bd;
+            struct lfs2_filebd_config cfg;
+        } file;
+        struct {
+            lfs2_rambd_t bd;
+            struct lfs2_rambd_config cfg;
+        } ram;
+    } u;
+
+    bool persist;
+    uint32_t power_cycles;
+    lfs2_testbd_wear_t *wear;
+
+    const struct lfs2_testbd_config *cfg;
+} lfs2_testbd_t;
+
+
+/// Block device API ///
+
+// Create a test block device using the geometry in lfs2_config
+//
+// Note that filebd is used if a path is provided, if path is NULL
+// testbd will use rambd which can be much faster.
+int lfs2_testbd_create(const struct lfs2_config *cfg, const char *path);
+int lfs2_testbd_createcfg(const struct lfs2_config *cfg, const char *path,
+        const struct lfs2_testbd_config *bdcfg);
+
+// Clean up memory associated with block device
+int lfs2_testbd_destroy(const struct lfs2_config *cfg);
+
+// Read a block
+int lfs2_testbd_read(const struct lfs2_config *cfg, lfs2_block_t block,
+        lfs2_off_t off, void *buffer, lfs2_size_t size);
+
+// Program a block
+//
+// The block must have previously been erased.
+int lfs2_testbd_prog(const struct lfs2_config *cfg, lfs2_block_t block,
+        lfs2_off_t off, const void *buffer, lfs2_size_t size);
+
+// Erase a block
+//
+// A block must be erased before being programmed. The
+// state of an erased block is undefined.
+int lfs2_testbd_erase(const struct lfs2_config *cfg, lfs2_block_t block);
+
+// Sync the block device
+int lfs2_testbd_sync(const struct lfs2_config *cfg);
+
+
+/// Additional extended API for driving test features ///
+
+// Get simulated wear on a given block
+lfs2_testbd_swear_t lfs2_testbd_getwear(const struct lfs2_config *cfg,
+        lfs2_block_t block);
+
+// Manually set simulated wear on a given block
+int lfs2_testbd_setwear(const struct lfs2_config *cfg,
+        lfs2_block_t block, lfs2_testbd_wear_t wear);
+
+
+#ifdef __cplusplus
+} /* extern "C" */
+#endif
+
+#endif