feat: 增加mount的MS_RDONLY标志的支持

增加mount的MS_RDONLY标志的支持，并修改vfs主要接口相关支持。
1. fatfs lseek接口在分区以MS_RDONLY方式和文件以只读打开时不再能够扩大文件的大小。
2. 直接在镜像中创建storage目录，而不是在挂载根文件系统时创建storage目录。
3. 增加了MS_RDONLY的测试用例。

Close #I3Z1W6

Signed-off-by: Far <yesiyuan2@huawei.com>

testsuites/unittest/fs/BUILD.gn

@@ -790,6 +790,9 @@ sources_full = [
   "jffs/full/It_vfs_test_symlink_002.cpp",
   "jffs/full/It_vfs_test_symlink_003.cpp",
   "jffs/full/It_vfs_test_symlinkat_001.cpp",
+  "jffs/full/It_vfs_test_mount_rdonly_001.cpp",
+  "jffs/full/It_vfs_test_mount_rdonly_002.cpp",
+  "jffs/full/It_vfs_test_mount_rdonly_003.cpp",
 ]
 
 if (LOSCFG_USER_TEST_LEVEL >= TEST_LEVEL_LOW) {

testsuites/unittest/fs/jffs/It_vfs_jffs.h

@@ -962,6 +962,9 @@ VOID ItFsTestSymlink001(VOID);
 VOID ItFsTestSymlink002(VOID);
 VOID ItFsTestSymlink003(VOID);
 VOID ItFsTestSymlinkat001(VOID);
+VOID ItFsTestMountRdonly001(VOID);
+VOID ItFsTestMountRdonly002(VOID);
+VOID ItFsTestMountRdonly003(VOID);
 #endif
 
 #if defined(LOSCFG_USER_TESTSUIT_SHELL)

testsuites/unittest/fs/jffs/full/It_vfs_test_mount_rdonly_001.cpp

@@ -0,0 +1,93 @@
+/*
+ * Copyright (c) 2021-2021 Huawei Device Co., Ltd. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without modification,
+ * are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice, this list of
+ *    conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright notice, this list
+ *    of conditions and the following disclaimer in the documentation and/or other materials
+ *    provided with the distribution.
+ *
+ * 3. Neither the name of the copyright holder nor the names of its contributors may be used
+ *    to endorse or promote products derived from this software without specific prior written
+ *    permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
+ * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+ * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR
+ * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+ * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
+ * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
+ * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
+ * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
+ * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include "It_vfs_jffs.h"
+
+static UINT32 testcase(VOID)
+{
+    INT32 fd = -1;
+    INT32 ret;
+    CHAR pathname1[JFFS_STANDARD_NAME_LENGTH] = { JFFS_PATH_NAME0 };
+    CHAR pathname2[JFFS_STANDARD_NAME_LENGTH] = { JFFS_PATH_NAME01 };
+
+    fd = creat(pathname1, 0777);
+    ICUNIT_GOTO_NOT_EQUAL(fd, JFFS_IS_ERROR, fd, EXIT);
+
+    ret = close(fd);
+    ICUNIT_GOTO_EQUAL(ret, JFFS_NO_ERROR, ret, EXIT4);
+
+    ret = umount(JFFS_MAIN_DIR0);
+    ICUNIT_GOTO_NOT_EQUAL(ret, JFFS_IS_ERROR, ret, EXIT3);
+
+    ret = mount(JFFS_DEV_PATH0, JFFS_MAIN_DIR0, JFFS_FILESYS_TYPE, MS_RDONLY, NULL);
+    ICUNIT_GOTO_NOT_EQUAL(ret, JFFS_IS_ERROR, ret, EXIT2);
+
+    fd = open(pathname1, O_RDWR);
+    ICUNIT_GOTO_EQUAL(fd, JFFS_IS_ERROR, fd, EXIT4);
+    
+    ret = symlink(pathname1, pathname2);
+    ICUNIT_GOTO_EQUAL(ret, JFFS_IS_ERROR, ret, EXIT5);    
+
+    ret = rename(pathname1, pathname2);
+    ICUNIT_GOTO_EQUAL(ret, JFFS_IS_ERROR, ret, EXIT5);
+
+    ret = unlink(pathname1);
+    ICUNIT_GOTO_EQUAL(ret, JFFS_IS_ERROR, ret, EXIT3);
+
+    ret = umount(JFFS_MAIN_DIR0);
+    ICUNIT_GOTO_NOT_EQUAL(ret, JFFS_IS_ERROR, ret, EXIT3);
+
+    ret = mount(JFFS_DEV_PATH0, JFFS_MAIN_DIR0, JFFS_FILESYS_TYPE, 0, NULL);
+    ICUNIT_GOTO_NOT_EQUAL(ret, JFFS_IS_ERROR, ret, EXIT2);
+
+    ret = unlink(pathname1);
+    ICUNIT_GOTO_NOT_EQUAL(ret, JFFS_IS_ERROR, ret, EXIT1);
+
+    return JFFS_NO_ERROR;
+
+EXIT5:
+    unlink(pathname2);
+    goto EXIT3;
+EXIT4:
+    close(fd);
+EXIT3:
+    umount(JFFS_MAIN_DIR0);
+EXIT2:
+    mount(JFFS_DEV_PATH0, JFFS_MAIN_DIR0, JFFS_FILESYS_TYPE, 0, NULL);
+EXIT1:
+    unlink(pathname1);
+EXIT:
+    return JFFS_NO_ERROR;
+}
+
+VOID ItFsTestMountRdonly001(VOID)
+{
+    TEST_ADD_CASE("IT_FS_TEST_MOUNT_RDONLY_001", testcase, TEST_VFS, TEST_JFFS, TEST_LEVEL0, TEST_FUNCTION);
+}

testsuites/unittest/fs/jffs/full/It_vfs_test_mount_rdonly_002.cpp

@@ -0,0 +1,79 @@
+/*
+ * Copyright (c) 2021-2021 Huawei Device Co., Ltd. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without modification,
+ * are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice, this list of
+ *    conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright notice, this list
+ *    of conditions and the following disclaimer in the documentation and/or other materials
+ *    provided with the distribution.
+ *
+ * 3. Neither the name of the copyright holder nor the names of its contributors may be used
+ *    to endorse or promote products derived from this software without specific prior written
+ *    permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
+ * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+ * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR
+ * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+ * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
+ * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
+ * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
+ * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
+ * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include "It_vfs_jffs.h"
+
+static UINT32 testcase(VOID)
+{
+    INT32 fd = -1;
+    INT32 ret;
+    CHAR pathname1[JFFS_STANDARD_NAME_LENGTH] = { JFFS_PATH_NAME0 };
+
+    ret = umount(JFFS_MAIN_DIR0);
+    ICUNIT_GOTO_NOT_EQUAL(ret, JFFS_IS_ERROR, ret, EXIT);
+
+    ret = mount(JFFS_DEV_PATH0, JFFS_MAIN_DIR0, JFFS_FILESYS_TYPE, MS_RDONLY, NULL);
+    ICUNIT_GOTO_NOT_EQUAL(ret, JFFS_IS_ERROR, ret, EXIT1);
+
+    fd = creat(pathname1, 0755);
+    ICUNIT_GOTO_EQUAL(fd, JFFS_IS_ERROR, fd, EXIT3);
+
+    fd = open(pathname1, O_CREAT | O_RDONLY, 0755);
+    ICUNIT_GOTO_EQUAL(fd, JFFS_IS_ERROR, fd, EXIT3);
+
+    fd = open(pathname1, O_CREAT | O_RDWR, 0755);
+    ICUNIT_GOTO_EQUAL(fd, JFFS_IS_ERROR, fd, EXIT3);
+    
+    ret = mkdir(pathname1, 0755);
+    ICUNIT_GOTO_EQUAL(ret, JFFS_IS_ERROR, ret, EXIT2);
+
+    ret = umount(JFFS_MAIN_DIR0);
+    ICUNIT_GOTO_NOT_EQUAL(ret, JFFS_IS_ERROR, ret, EXIT1);
+
+    ret = mount(JFFS_DEV_PATH0, JFFS_MAIN_DIR0, JFFS_FILESYS_TYPE, 0, NULL);
+    ICUNIT_GOTO_NOT_EQUAL(ret, JFFS_IS_ERROR, ret, EXIT1);
+
+    return JFFS_NO_ERROR;
+
+EXIT3:
+    close(fd);
+EXIT2:
+    remove(pathname1);
+EXIT1:
+    umount(JFFS_MAIN_DIR0);
+    mount(JFFS_DEV_PATH0, JFFS_MAIN_DIR0, JFFS_FILESYS_TYPE, 0, NULL);
+EXIT:
+    return JFFS_NO_ERROR;
+}
+
+VOID ItFsTestMountRdonly002(VOID)
+{
+    TEST_ADD_CASE("IT_FS_TEST_MOUNT_RDONLY_002", testcase, TEST_VFS, TEST_JFFS, TEST_LEVEL0, TEST_FUNCTION);
+}

testsuites/unittest/fs/jffs/full/It_vfs_test_mount_rdonly_003.cpp

@@ -0,0 +1,95 @@
+/*
+ * Copyright (c) 2021-2021 Huawei Device Co., Ltd. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without modification,
+ * are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice, this list of
+ *    conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright notice, this list
+ *    of conditions and the following disclaimer in the documentation and/or other materials
+ *    provided with the distribution.
+ *
+ * 3. Neither the name of the copyright holder nor the names of its contributors may be used
+ *    to endorse or promote products derived from this software without specific prior written
+ *    permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
+ * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+ * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR
+ * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+ * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
+ * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
+ * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
+ * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
+ * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include "It_vfs_jffs.h"
+
+static UINT32 testcase(VOID)
+{
+    INT32 fd = -1;
+    INT32 ret;
+    CHAR readbuf[JFFS_STANDARD_NAME_LENGTH] = {0};
+    const CHAR writebuf[JFFS_STANDARD_NAME_LENGTH] = "0123456789";
+    CHAR pathname1[JFFS_STANDARD_NAME_LENGTH] = { JFFS_PATH_NAME0 };
+
+    fd = creat(pathname1, 0777);
+    ICUNIT_GOTO_NOT_EQUAL(fd, JFFS_IS_ERROR, fd, EXIT);
+
+    ret = write(fd, writebuf, strlen(writebuf));
+    ICUNIT_GOTO_EQUAL(ret, strlen(writebuf), ret, EXIT4);
+
+    ret = close(fd);
+    ICUNIT_GOTO_EQUAL(ret, JFFS_NO_ERROR, ret, EXIT4);
+
+    ret = umount(JFFS_MAIN_DIR0);
+    ICUNIT_GOTO_NOT_EQUAL(ret, JFFS_IS_ERROR, ret, EXIT3);
+
+    ret = mount(JFFS_DEV_PATH0, JFFS_MAIN_DIR0, JFFS_FILESYS_TYPE, MS_RDONLY, NULL);
+    ICUNIT_GOTO_NOT_EQUAL(ret, JFFS_IS_ERROR, ret, EXIT2);
+
+    fd = open(pathname1, O_RDWR);
+    ICUNIT_GOTO_EQUAL(fd, JFFS_IS_ERROR, fd, EXIT4);
+
+    fd = open(pathname1, O_RDONLY);
+    ICUNIT_GOTO_NOT_EQUAL(fd, JFFS_IS_ERROR, fd, EXIT4);
+
+    ret = read(fd, readbuf, strlen(writebuf));
+    ICUNIT_GOTO_EQUAL(ret, strlen(writebuf), ret, EXIT4);
+    ICUNIT_GOTO_STRING_EQUAL(readbuf, writebuf, readbuf, EXIT4);
+
+    ret = close(fd);
+    ICUNIT_GOTO_NOT_EQUAL(ret, JFFS_IS_ERROR, ret, EXIT4);
+
+    ret = umount(JFFS_MAIN_DIR0);
+    ICUNIT_GOTO_NOT_EQUAL(ret, JFFS_IS_ERROR, ret, EXIT3);
+
+    ret = mount(JFFS_DEV_PATH0, JFFS_MAIN_DIR0, JFFS_FILESYS_TYPE, 0, NULL);
+    ICUNIT_GOTO_NOT_EQUAL(ret, JFFS_IS_ERROR, ret, EXIT2);
+
+    ret = unlink(pathname1);
+    ICUNIT_GOTO_NOT_EQUAL(ret, JFFS_IS_ERROR, ret, EXIT1);
+
+    return JFFS_NO_ERROR;
+
+EXIT4:
+    close(fd);
+EXIT3:
+    umount(JFFS_MAIN_DIR0);
+EXIT2:
+    mount(JFFS_DEV_PATH0, JFFS_MAIN_DIR0, JFFS_FILESYS_TYPE, 0, NULL);
+EXIT1:
+    unlink(pathname1);
+EXIT:
+    return JFFS_NO_ERROR;
+}
+
+VOID ItFsTestMountRdonly003(VOID)
+{
+    TEST_ADD_CASE("IT_FS_TEST_MOUNT_RDONLY_003", testcase, TEST_VFS, TEST_JFFS, TEST_LEVEL0, TEST_FUNCTION);
+}

testsuites/unittest/fs/jffs/vfs_jffs_test.cpp

@@ -6885,6 +6885,21 @@ HWTEST_F(VfsJffsTest, ItFsTestSymlinkat001, TestSize.Level0)
     ItFsTestSymlinkat001();
 }
 
+HWTEST_F(VfsJffsTest, ItFsTestMountRdonly001, TestSize.Level0)
+{
+    ItFsTestMountRdonly001();
+}
+
+HWTEST_F(VfsJffsTest, ItFsTestMountRdonly002, TestSize.Level0)
+{
+    ItFsTestMountRdonly002();
+}
+
+HWTEST_F(VfsJffsTest, ItFsTestMountRdonly003, TestSize.Level0)
+{
+    ItFsTestMountRdonly003();
+}
+
 #endif
 #if defined(LOSCFG_USER_TEST_SMOKE)
 /* *