diff --git a/bspMCU/include/w25qxx.h b/bspMCU/include/w25qxx.h
index f8bb134..c7e3d95 100644
--- a/bspMCU/include/w25qxx.h
+++ b/bspMCU/include/w25qxx.h
@@ -79,12 +79,12 @@ void     W25QXX_4ByteAddr_Enable(void);
 void     W25QXX_Write_SR(uint8_t regno, uint8_t sr);
 void     W25QXX_Write_Enable(void);
 void     W25QXX_Write_Disable(void);
-void     W25QXX_Write_Page(uint8_t *pBuffer, uint32_t WriteAddr, uint16_t NumByteToWrite);
-void     W25QXX_Write_NoCheck(uint8_t *pBuffer, uint32_t WriteAddr, uint16_t NumByteToWrite);
-void     W25QXX_Read(uint8_t *pBuffer, uint32_t ReadAddr, uint16_t NumByteToRead);
+int      W25QXX_Write_Page(uint8_t *pBuffer, uint32_t WriteAddr, uint16_t NumByteToWrite);
+int      W25QXX_Write_NoCheck(uint8_t *pBuffer, uint32_t WriteAddr, uint16_t NumByteToWrite);
+int      W25QXX_Read(uint8_t *pBuffer, uint32_t ReadAddr, uint16_t NumByteToRead);
 void     W25QXX_Write(uint8_t *pBuffer, uint32_t WriteAddr, uint16_t NumByteToWrite);
 void     W25QXX_Erase_Chip(void);
-void     W25QXX_Erase_Sector(uint32_t Dst_Addr);
+int      W25QXX_Erase_Sector(uint32_t Dst_Addr);
 void     W25QXX_Wait_Busy(void);
 void     W25QXX_PowerDown(void);
 void     W25QXX_WAKEUP(void);
diff --git a/bspMCU/w25qxx.c b/bspMCU/w25qxx.c
index ad94fe9..85b7f42 100644
--- a/bspMCU/w25qxx.c
+++ b/bspMCU/w25qxx.c
@@ -221,14 +221,14 @@ void W25QXX_Write_Disable(void)
     W25QXX_CommandOnly(W25X_WriteDisable);
 }
 
-/** 读取指定地址、指定长度的数据（1-Line 标准读 0x03） */
-void W25QXX_Read(uint8_t *pBuffer, uint32_t ReadAddr, uint16_t NumByteToRead)
+/** 读取指定地址、指定长度的数据（1-Line 标准读 0x03），返回 0 成功 / -1 失败 */
+int W25QXX_Read(uint8_t *pBuffer, uint32_t ReadAddr, uint16_t NumByteToRead)
 {
     QSPI_CommandTypeDef cmd = {0};
 
     if (NumByteToRead == 0)
     {
-        return;
+        return 0;
     }
 
     W25QXX_Command_Base(&cmd);
@@ -241,19 +241,23 @@ void W25QXX_Read(uint8_t *pBuffer, uint32_t ReadAddr, uint16_t NumByteToRead)
 
     if (HAL_QSPI_Command(&hqspi, &cmd, HAL_QSPI_TIMEOUT_DEFAULT_VALUE) != HAL_OK)
     {
-        return;
+        return -1;
+    }
+    if (HAL_QSPI_Receive(&hqspi, pBuffer, HAL_QSPI_TIMEOUT_DEFAULT_VALUE) != HAL_OK)
+    {
+        return -1;
     }
-    HAL_QSPI_Receive(&hqspi, pBuffer, HAL_QSPI_TIMEOUT_DEFAULT_VALUE);
+    return 0;
 }
 
-/** 页编程（≤256 字节，不跨页） */
-void W25QXX_Write_Page(uint8_t *pBuffer, uint32_t WriteAddr, uint16_t NumByteToWrite)
+/** 页编程（≤256 字节，不跨页），返回 0 成功 / -1 失败 */
+int W25QXX_Write_Page(uint8_t *pBuffer, uint32_t WriteAddr, uint16_t NumByteToWrite)
 {
     QSPI_CommandTypeDef cmd = {0};
 
     if (NumByteToWrite == 0)
     {
-        return;
+        return 0;
     }
 
     W25QXX_Write_Enable();
@@ -268,14 +272,18 @@ void W25QXX_Write_Page(uint8_t *pBuffer, uint32_t WriteAddr, uint16_t NumByteToW
 
     if (HAL_QSPI_Command(&hqspi, &cmd, HAL_QSPI_TIMEOUT_DEFAULT_VALUE) != HAL_OK)
     {
-        return;
+        return -1;
+    }
+    if (HAL_QSPI_Transmit(&hqspi, pBuffer, HAL_QSPI_TIMEOUT_DEFAULT_VALUE) != HAL_OK)
+    {
+        return -1;
     }
-    HAL_QSPI_Transmit(&hqspi, pBuffer, HAL_QSPI_TIMEOUT_DEFAULT_VALUE);
     W25QXX_Wait_Busy();
+    return 0;
 }
 
-/** 无校验写入：自动跨页，不检查/不擦除（调用方须保证目标区已擦除） */
-void W25QXX_Write_NoCheck(uint8_t *pBuffer, uint32_t WriteAddr, uint16_t NumByteToWrite)
+/** 无校验写入：自动跨页，不检查/不擦除（调用方须保证目标区已擦除），返回 0 成功 / -1 失败 */
+int W25QXX_Write_NoCheck(uint8_t *pBuffer, uint32_t WriteAddr, uint16_t NumByteToWrite)
 {
     uint16_t pageremain = W25QXX_PAGE_SIZE - (WriteAddr % W25QXX_PAGE_SIZE); /* 本页剩余 */
 
@@ -286,7 +294,10 @@ void W25QXX_Write_NoCheck(uint8_t *pBuffer, uint32_t WriteAddr, uint16_t NumByte
 
     while (1)
     {
-        W25QXX_Write_Page(pBuffer, WriteAddr, pageremain);
+        if (W25QXX_Write_Page(pBuffer, WriteAddr, pageremain) != 0)
+        {
+            return -1;
+        }
 
         if (NumByteToWrite == pageremain)
         {
@@ -308,6 +319,7 @@ void W25QXX_Write_NoCheck(uint8_t *pBuffer, uint32_t WriteAddr, uint16_t NumByte
             }
         }
     }
+    return 0;
 }
 
 /** 带擦除的写入：自动跨页跨扇区，非 0xFF 区域先擦除再写 */
@@ -387,8 +399,8 @@ void W25QXX_Erase_Chip(void)
     W25QXX_WaitBusy_Timeout(250000U);
 }
 
-/** 扇区擦除，入参为扇区号（内部 ×4096 得到字节地址） */
-void W25QXX_Erase_Sector(uint32_t Dst_Addr)
+/** 扇区擦除，入参为扇区号（内部 ×4096 得到字节地址），返回 0 成功 / -1 失败 */
+int W25QXX_Erase_Sector(uint32_t Dst_Addr)
 {
     uint32_t byte_addr = Dst_Addr * W25QXX_SECTOR_SIZE;
     QSPI_CommandTypeDef cmd = {0};
@@ -405,9 +417,10 @@ void W25QXX_Erase_Sector(uint32_t Dst_Addr)
 
     if (HAL_QSPI_Command(&hqspi, &cmd, HAL_QSPI_TIMEOUT_DEFAULT_VALUE) != HAL_OK)
     {
-        return;
+        return -1;
     }
     W25QXX_Wait_Busy();
+    return 0;
 }
 
 /** 等待 Flash 空闲：自动轮询状态寄存器 bit0(BUSY) 直至为 0 */
@@ -541,7 +554,7 @@ uint16_t W25QXX_ReadID(void)
     return Temp;
 }
 
-void W25QXX_Read(uint8_t *pBuffer, uint32_t ReadAddr, uint16_t NumByteToRead)
+int W25QXX_Read(uint8_t *pBuffer, uint32_t ReadAddr, uint16_t NumByteToRead)
 {
     uint16_t i;
     W25QXX_CS(0);
@@ -558,9 +571,10 @@ void W25QXX_Read(uint8_t *pBuffer, uint32_t ReadAddr, uint16_t NumByteToRead)
         pBuffer[i] = SPI2_ReadWriteByte(0xFF);
     }
     W25QXX_CS(1);
+    return 0;
 }
 
-void W25QXX_Write_Page(uint8_t *pBuffer, uint32_t WriteAddr, uint16_t NumByteToWrite)
+int W25QXX_Write_Page(uint8_t *pBuffer, uint32_t WriteAddr, uint16_t NumByteToWrite)
 {
     uint16_t i;
     W25QXX_Write_Enable();
@@ -579,9 +593,10 @@ void W25QXX_Write_Page(uint8_t *pBuffer, uint32_t WriteAddr, uint16_t NumByteToW
     }
     W25QXX_CS(1);
     W25QXX_Wait_Busy();
+    return 0;
 }
 
-void W25QXX_Write_NoCheck(uint8_t *pBuffer, uint32_t WriteAddr, uint16_t NumByteToWrite)
+int W25QXX_Write_NoCheck(uint8_t *pBuffer, uint32_t WriteAddr, uint16_t NumByteToWrite)
 {
     uint16_t pageremain;
     pageremain = 256 - WriteAddr % 256;
@@ -611,6 +626,7 @@ void W25QXX_Write_NoCheck(uint8_t *pBuffer, uint32_t WriteAddr, uint16_t NumByte
             }
         }
     }
+    return 0;
 }
 
 void W25QXX_Write(uint8_t *pBuffer, uint32_t WriteAddr, uint16_t NumByteToWrite)
@@ -686,7 +702,7 @@ void W25QXX_Erase_Chip(void)
     W25QXX_Wait_Busy();
 }
 
-void W25QXX_Erase_Sector(uint32_t Dst_Addr)
+int W25QXX_Erase_Sector(uint32_t Dst_Addr)
 {
     Dst_Addr *= 4096;
     W25QXX_Write_Enable();
@@ -702,6 +718,7 @@ void W25QXX_Erase_Sector(uint32_t Dst_Addr)
     SPI2_ReadWriteByte((uint8_t)Dst_Addr);
     W25QXX_CS(1);
     W25QXX_Wait_Busy();
+    return 0;
 }
 
 void W25QXX_Wait_Busy(void)
diff --git a/library/common/rd_stdio.c b/library/common/rd_stdio.c
index 5b2fbd1..dabe014 100644
--- a/library/common/rd_stdio.c
+++ b/library/common/rd_stdio.c
@@ -81,10 +81,22 @@ WEAK void *Rd_Fopen(const char *path, const char *mode)
 #else
 	const char *p = path;
 	lfs_file_t *file = RD_MALLOC(sizeof(lfs_file_t));
-	int flags;
+	int flags = 0;
 	if (strlen(path) >= 2 && path[1] == ':') p = path + 2;
-	if (strchr(mode, 'r') != NULL) flags = LFS_O_RDONLY;
-	else flags = LFS_O_WRONLY | LFS_O_CREAT | LFS_O_TRUNC;
+	/* 按 mode 首字符解析：r 只读 / w 写并截断 / a 追加；
+	   带 '+' 则为读写。避免 "a+" 被误判为 TRUNC 清空文件 */
+	if (mode[0] == 'r') {
+		flags = LFS_O_RDONLY;
+		if (strchr(mode, '+')) flags = LFS_O_RDWR;
+	} else if (mode[0] == 'w') {
+		flags = LFS_O_WRONLY | LFS_O_CREAT | LFS_O_TRUNC;
+		if (strchr(mode, '+')) flags = LFS_O_RDWR | LFS_O_CREAT | LFS_O_TRUNC;
+	} else if (mode[0] == 'a') {
+		flags = LFS_O_WRONLY | LFS_O_CREAT | LFS_O_APPEND;
+		if (strchr(mode, '+')) flags = LFS_O_RDWR | LFS_O_CREAT | LFS_O_APPEND;
+	} else {
+		flags = LFS_O_RDONLY;   /* 未知 mode 默认只读 */
+	}
 	int err = lfs_file_open(&g_lfs, file, p, flags);
 	if(err) return NULL;
 	else return (void *)file;
diff --git a/library/littlefs/include/lfs.h b/library/littlefs/include/lfs.h
index 8fbd5b4..6f1cf3a 100644
--- a/library/littlefs/include/lfs.h
+++ b/library/littlefs/include/lfs.h
@@ -32,7 +32,7 @@ extern "C"
 #define LFS_DISK_VERSION_MAJOR (0xffff & (LFS_DISK_VERSION >> 16))
 #define LFS_DISK_VERSION_MINOR (0xffff & (LFS_DISK_VERSION >>  0))
 
-
+#define LFS_THREADSAFE
 /// Definitions ///
 
 // Type definitions
diff --git a/library/littlefs/lfs_flashbd.c b/library/littlefs/lfs_flashbd.c
index 3846727..c781957 100644
--- a/library/littlefs/lfs_flashbd.c
+++ b/library/littlefs/lfs_flashbd.c
@@ -10,6 +10,9 @@
 #include "lfs_flashbd.h"
 #include "../../bspMCU/include/w25qxx.h"
 #include <string.h>
+#include "rd_thread.h"
+
+static rd_mutex_t g_lfs_mutex;
 
 int lfs_flashbd_create(const struct lfs_config *cfg,
         const struct lfs_flashbd_config *bdcfg) {
@@ -47,7 +50,10 @@ int lfs_flashbd_read(const struct lfs_config *cfg, lfs_block_t block,
                   + (uint32_t)block * cfg->block_size
                   + (uint32_t)off;
 
-    W25QXX_Read((uint8_t *)buffer, addr, (uint16_t)size);
+    if (W25QXX_Read((uint8_t *)buffer, addr, (uint16_t)size) != 0)
+    {
+        return LFS_ERR_IO;
+    }
 
     return LFS_ERR_OK;
 }
@@ -68,7 +74,10 @@ int lfs_flashbd_prog(const struct lfs_config *cfg, lfs_block_t block,
      * 但该函数只读取 buffer 内容，不会修改，故安全地去除 const。
      * littleFS 保证写入前块已擦除，因此无需带擦除的 W25QXX_Write。
      */
-    W25QXX_Write_NoCheck((uint8_t *)(uintptr_t)buffer, addr, (uint16_t)size);
+    if (W25QXX_Write_NoCheck((uint8_t *)(uintptr_t)buffer, addr, (uint16_t)size) != 0)
+    {
+        return LFS_ERR_IO;
+    }
 
     return LFS_ERR_OK;
 }
@@ -85,7 +94,10 @@ int lfs_flashbd_erase(const struct lfs_config *cfg, lfs_block_t block) {
      * W25QXX_Erase_Sector 的参数是扇区号（内部会乘以 4096），
      * 所以传入字节地址除以扇区大小。
      */
-    W25QXX_Erase_Sector(addr / LFS_FLASHBD_SECTOR_SIZE);
+    if (W25QXX_Erase_Sector(addr / LFS_FLASHBD_SECTOR_SIZE) != 0)
+    {
+        return LFS_ERR_IO;
+    }
 
     return LFS_ERR_OK;
 }
@@ -96,6 +108,20 @@ int lfs_flashbd_sync(const struct lfs_config *cfg) {
     return LFS_ERR_OK;
 }
 
+int lfs_flashbd_lock(const struct lfs_config *cfg)
+{
+    (void)cfg;
+    Rd_MutexLock(&g_lfs_mutex, __func__, NULL);
+    return LFS_ERR_OK;
+}
+
+int lfs_flashbd_unlock(const struct lfs_config *cfg)
+{
+    (void)cfg;
+    Rd_MutexUnlock(&g_lfs_mutex, __func__, NULL);
+    return LFS_ERR_OK;
+}
+
 void lfs_flashbd_default_config(
         struct lfs_config *cfg,
         lfs_flashbd_t *bd,
@@ -113,12 +139,16 @@ void lfs_flashbd_default_config(
 
     bd->cfg = bdcfg;
 
+    (void)Rd_MutexInit(&g_lfs_mutex);
+
     /* 回调函数 */
     cfg->context = bd;
     cfg->read    = lfs_flashbd_read;
     cfg->prog    = lfs_flashbd_prog;
     cfg->erase   = lfs_flashbd_erase;
     cfg->sync    = lfs_flashbd_sync;
+    cfg->lock    = lfs_flashbd_lock;
+    cfg->unlock  = lfs_flashbd_unlock;
 
     /* 块设备参数 */
     cfg->read_size       = 256;          /* W25QXX 页大小，读取可任意长度 */
diff --git a/library/log/elog_file.c b/library/log/elog_file.c
index 076ef40..591ddf5 100644
--- a/library/log/elog_file.c
+++ b/library/log/elog_file.c
@@ -81,7 +81,8 @@ static bool elog_file_rotate(void)
     RD_MEMCPY(oldpath, local_cfg.name, base);
     RD_MEMCPY(newpath, local_cfg.name, base);
 
-    fclose(fp);
+    Rd_Mclose(fp);
+    fp = NULL;
 
     for (n = local_cfg.max_rotate - 1; n >= 0; --n) {
         RD_SNPRINTF(oldpath + base, SUFFIX_LEN, n ? ".%d" : "", n - 1);