52.移植步骤a.设置内核的配置：CONFIG_FUSE_FS=y；（会创建/dev/fuse结点）b.在Android源码目录下的external目录下创建exfat-fuse目录，交将上面通过svn下载的exFAT代码复制到该目录下，并将fuse-2.9.3.tar.gz文件解压后将其文件也复制到该目录下，进入到exfat-fuse目录，执行./configure命令，会创建include/config.h等文件；c.在exfat-fuse目录下创建Android.mk文件，内容如下：LOCAL_PATH := $(call my-dir)include $(CLEAR_VARS)SRCPATH := libLOCAL_CFLAGS := -D_FILE_OFFSET_BITS=64 -DFUSE_USE_VERSION=26LOCAL_MODULE_TAGS := optionalLOCAL_MODULE := libfuse_exfatLOCAL_SRC_FILES := $(SRCPATH)/buffer.cLOCAL_SRC_FILES += $(SRCPATH)/cuse_lowlevel.cLOCAL_SRC_FILES += $(SRCPATH)/fuse.cLOCAL_SRC_FILES += $(SRCPATH)/fuse_kern_chan.cLOCAL_SRC_FILES += $(SRCPATH)/fuse_loop.cLOCAL_SRC_FILES += $(SRCPATH)/fuse_loop_mt.cLOCAL_SRC_FILES += $(SRCPATH)/fuse_lowlevel.cLOCAL_SRC_FILES += $(SRCPATH)/fuse_mt.cLOCAL_SRC_FILES += $(SRCPATH)/fuse_opt.cLOCAL_SRC_FILES += $(SRCPATH)/fuse_session.cLOCAL_SRC_FILES += $(SRCPATH)/fuse_signals.cLOCAL_SRC_FILES += $(SRCPATH)/helper.cLOCAL_SRC_FILES += $(SRCPATH)/mount.cLOCAL_SRC_FILES += $(SRCPATH)/mount_util.cLOCAL_SRC_FILES += $(SRCPATH)/ulockmgr.cLOCAL_SHARED_LIBRARIES := libdlLOCAL_PRELINK_MODULE := falseLOCAL_C_INCLUDES := $(LOCAL_PATH)/includeinclude $(BUILD_SHARED_LIBRARY)include $(CLEAR_VARS)SRCPATH := libexfatLOCAL_CFLAGS := -D_FILE_OFFSET_BITS=64 -DFUSE_USE_VERSION=26 -D__GLIBC__=1LOCAL_MODULE_TAGS := optionalLOCAL_MODULE := libexfatLOCAL_SRC_FILES := $(SRCPATH)/cluster.cLOCAL_SRC_FILES += $(SRCPATH)/io.cLOCAL_SRC_FILES += $(SRCPATH)/log.cLOCAL_SRC_FILES += $(SRCPATH)/lookup.cLOCAL_SRC_FILES += $(SRCPATH)/mount.cLOCAL_SRC_FILES += $(SRCPATH)/node.cLOCAL_SRC_FILES += $(SRCPATH)/time.cLOCAL_SRC_FILES += $(SRCPATH)/utf.cLOCAL_SRC_FILES += $(SRCPATH)/utils.cLOCAL_SHARED_LIBRARIES := libdl libfuse_exfatLOCAL_PRELINK_MODULE := falseinclude $(BUILD_SHARED_LIBRARY)include $(CLEAR_VARS)LOCAL_CFLAGS := -D_FILE_OFFSET_BITS=64 -D__GLIBC__=1LOCAL_C_INCLUDES := $(LOCAL_PATH)/libexfatLOCAL_MODULE := dumpexfatLOCAL_MODULE_TAGS := optionalLOCAL_SRC_FILES := dump/main.cLOCAL_SHARED_LIBRARIES := libexfatinclude $(BUILD_EXECUTABLE)include $(CLEAR_VARS)LOCAL_CFLAGS := -D_FILE_OFFSET_BITS=64 -D__GLIBC__=1LOCAL_C_INCLUDES := $(LOCAL_PATH)/libexfatLOCAL_MODULE := fsck.exfatLOCAL_MODULE_TAGS := optionalLOCAL_SRC_FILES := fsck/main.cLOCAL_SHARED_LIBRARIES := libexfatinclude $(BUILD_EXECUTABLE)include $(CLEAR_VARS)LOCAL_CFLAGS := -D_FILE_OFFSET_BITS=64 -D__GLIBC__=1LOCAL_C_INCLUDES := $(LOCAL_PATH)/libexfatLOCAL_MODULE := exfat.labelLOCAL_MODULE_TAGS := optionalLOCAL_SRC_FILES := label/main.cLOCAL_SHARED_LIBRARIES := libexfatinclude $(BUILD_EXECUTABLE)include $(CLEAR_VARS)LOCAL_CFLAGS := -D_FILE_OFFSET_BITS=64 -D__GLIBC__=1LOCAL_C_INCLUDES := $(LOCAL_PATH)/libexfatLOCAL_MODULE := mkfs.exfatLOCAL_MODULE_TAGS := optionalLOCAL_SRC_FILES := mkfs/main.c mkfs/cbm.c mkfs/fat.c mkfs/rootdir.c mkfs/uct.c mkfs/vbr.c mkfs/mkexfat.c mkfs/uctc.cLOCAL_SHARED_LIBRARIES := libexfatinclude $(BUILD_EXECUTABLE)include $(CLEAR_VARS)LOCAL_CFLAGS := -D_FILE_OFFSET_BITS=64 -DFUSE_USE_VERSION=26 -D__GLIBC__=1LOCAL_C_INCLUDES := $(LOCAL_PATH)/include $(LOCAL_PATH)/libexfatLOCAL_MODULE := mount.exfatLOCAL_MODULE_TAGS := optionalLOCAL_SRC_FILES := fuse/main.cLOCAL_SHARED_LIBRARIES := libfuse_exfat libexfatinclude $(BUILD_EXECUTABLE)d.在相应产品的device.mk文件里添加如下语句：PRODUCT_PACKAGES += \ fsck.exfat mount.exfat mkfs.exfat我们现在只需要上面3个工具即可，而添加的Android.mk里还有其他工具，如果也想编译进来，可直接加到该配置项后面。e.跟库相关配置添加好了，接下来就是编译和处理编译异常了，刚开始编译，出现如下错误：target thumb C: libfuse_exfat <= external/exfat-fuse/lib/buffer.cIn file included from external/exfat-fuse/lib/buffer.c:12:0:external/exfat-fuse/lib/fuse_i.h:35:2: error: unknown type name 'pthread_mutex_t'external/exfat-fuse/lib/fuse_i.h:82:2: error: unknown type name 'pthread_mutex_t'external/exfat-fuse/lib/fuse_i.h:84:2: error: unknown type name 'pthread_key_t'external/exfat-fuse/lib/fuse_i.h:130:23: error: unknown type name 'pthread_t'external/exfat-fuse/lib/buffer.c: In function 'fuse_buf_write':external/exfat-fuse/lib/buffer.c:48:35: warning: pointer of type 'void *' used in arithmetic [-Wpointer-arith]external/exfat-fuse/lib/buffer.c:51:34: warning: pointer of type 'void *' used in arithmetic [-Wpointer-arith]external/exfat-fuse/lib/buffer.c: In function 'fuse_buf_read':external/exfat-fuse/lib/buffer.c:82:34: warning: pointer of type 'void *' used in arithmetic [-Wpointer-arith]external/exfat-fuse/lib/buffer.c:85:33: warning: pointer of type 'void *' used in arithmetic [-Wpointer-arith]external/exfat-fuse/lib/buffer.c: In function 'fuse_buf_fd_to_fd':external/exfat-fuse/lib/buffer.c:146:11: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]external/exfat-fuse/lib/buffer.c: In function 'fuse_buf_splice':external/exfat-fuse/lib/buffer.c:171:19: error: 'SPLICE_F_MOVE' undeclared (first use in this function)external/exfat-fuse/lib/buffer.c:171:19: note: each undeclared identifier is reported only once for each function it appears inexternal/exfat-fuse/lib/buffer.c:173:19: error: 'SPLICE_F_NONBLOCK' undeclared (first use in this function)external/exfat-fuse/lib/buffer.c:185:3: warning: implicit declaration of function 'splice' [-Wimplicit-function-declaration]external/exfat-fuse/lib/buffer.c: In function 'fuse_buf_copy_one':external/exfat-fuse/lib/buffer.c:232:27: warning: pointer of type 'void *' used in arithmetic [-Wpointer-arith]external/exfat-fuse/lib/buffer.c:233:27: warning: pointer of type 'void *' used in arithmetic [-Wpointer-arith]external/exfat-fuse/lib/buffer.c:236:15: warning: pointer of type 'void *' used in arithmetic [-Wpointer-arith]external/exfat-fuse/lib/buffer.c:236:41: warning: pointer of type 'void *' used in arithmetic [-Wpointer-arith]external/exfat-fuse/lib/buffer.c: In function 'fuse_buf_copy':external/exfat-fuse/lib/buffer.c:313:11: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]看到是跟多线程与splice相关的，从相关资料了解到Android的bionic里面对pthread相关函数支持不佳，故而将相应功能先通过宏屏蔽掉：a).将./include/config.h文件的#define HAVE_SPLICE 1注释掉；b).修改./lib/fuse_mt.c文件，在fuse_loop_mt_proc函数中，将res = fuse_session_loop_mt(se);一句使用#ifdef __MULTI_THREAD和#endif括起来； 在同一文件中的fuse_loop_mt函数中，将如下语句也使用上面的宏括起来： int res = fuse_start_cleanup_thread(f); if (res) return -1; res = fuse_session_loop_mt(fuse_get_session(f)); fuse_stop_cleanup_thread(f); 并在该函数的第一句前加上int res = -1;一句。 修改./lib/cuse_lowlevel.c文件，在cuse_lowlevel_main函数中，将如下语句使用上面的宏括起来： if (multithreaded) res = fuse_session_loop_mt(se); else 修改./lib/fuse.c文件，使用上面的宏将fuse_start_cleanup_thread和fuse_stop_cleanup_thread两函数（包括函数体）括起来； 修改./lib/fuse_loop_mt.c文件，使用上面的宏将整个文件内容括起来； 修改./lib/helper.c文件，在fuse_main_common函数中，将如下语句使用上面的宏括起来： if (multithreaded) res = fuse_loop_mt(fuse); elsec).修改./include/fuse_common.h文件，添加#include 定义。此时再次编译，有如下提示：external/exfat-fuse/lib/fuse.c: In function 'fuse_fs_read_buf':external/exfat-fuse/lib/fuse.c:1804:40: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]external/exfat-fuse/lib/fuse.c: In function 'mtime_eq':external/exfat-fuse/lib/fuse.c:2427:25: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]external/exfat-fuse/lib/fuse.c:2428:3: error: 'struct stat const' has no member named 'st_mtim'external/exfat-fuse/lib/fuse.c: In function 'update_stat':external/exfat-fuse/lib/fuse.c:2455:24: error: 'struct stat const' has no member named 'st_mtim'external/exfat-fuse/lib/fuse.c: In function 'fuse_lib_setattr':external/exfat-fuse/lib/fuse.c:2810:17: error: 'struct stat' has no member named 'st_atim'external/exfat-fuse/lib/fuse.c:2815:17: error: 'struct stat' has no member named 'st_mtim'external/exfat-fuse/lib/fuse.c:2825:20: error: 'struct stat' has no member named 'st_atim'external/exfat-fuse/lib/fuse.c:2827:20: error: 'struct stat' has no member named 'st_mtim'没有相应的成员，做如下修改：a).修改./include/config.h文件，将#define HAVE_STRUCT_STAT_ST_ATIM 1屏蔽掉；b).修改./lib/fuse.c文件，在fuse_lib_setattr函数中的#ifdef HAVE_UTIMENSAT宏判断里做如下修改：将tv[0] = attr->st_atim;修改为tv[0].tv_nsec = attr->st_atime;将tv[1] = attr->st_mtim;修改为tv[1].tv_nsec = attr->st_mtime;再次编译，出现如下错误：external/exfat-fuse/lib/mount.c: In function 'exec_fusermount':external/exfat-fuse/lib/mount.c:142:8: error: 'FUSERMOUNT_DIR' undeclared (first use in this function)external/exfat-fuse/lib/mount.c:142:8: note: each undeclared identifier is reported only once for each function it appears inexternal/exfat-fuse/lib/mount.c:142:23: error: expected ')' before string constantexternal/exfat-fuse/lib/mount.c:142:23: error: too few arguments to function 'execv'修改./lib/mount.c文件，在合适的位置添加如下语句：#ifndef FUSERMOUNT_DIR#define FUSERMOUNT_DIR '/system/bin/bin'#endif再次编译，出现如下错误：external/exfat-fuse/lib/mount_util.c: In function 'mtab_needs_update':external/exfat-fuse/lib/mount_util.c:37:19: error: '_PATH_MOUNTED' undeclared (first use in this function)external/exfat-fuse/lib/mount_util.c:37:19: note: each undeclared identifier is reported only once for each function it appears in修改./lib/mount_util.c文件，在合适的位置添加如下语句：#ifndef _PATH_MOUNTED#define _PATH_MOUNTED '/etc/mtab'#endif再次编译，出现如下错误提示：/home/guochongxin/rk/3188/new/SDK4.2.2/prebuilts/gcc/linux-x86/arm/arm-linux-androideabi-4.6/bin/../lib/gcc/arm-linux-androideabi/4.6.x-google/../../../../arm-linux-androideabi/bin/ld: error: symbol __fuse_process_cmd has undefined version /home/guochongxin/rk/3188/new/SDK4.2.2/prebuilts/gcc/linux-x86/arm/arm-linux-androideabi-4.6/bin/../lib/gcc/arm-linux-androideabi/4.6.x-google/../../../../arm-linux-androideabi/bin/ld: error: symbol fuse_lowlevel_new has undefined version FUSE_2.5/home/guochongxin/rk/3188/new/SDK4.2.2/prebuilts/gcc/linux-x86/arm/arm-linux-androideabi-4.6/bin/../lib/gcc/arm-linux-androideabi/4.6.x-google/../../../../arm-linux-androideabi/bin/ld: error: symbol fuse_chan_new has undefined version FUSE_2.4/home/guochongxin/rk/3188/new/SDK4.2.2/prebuilts/gcc/linux-x86/arm/arm-linux-androideabi-4.6/bin/../lib/gcc/arm-linux-androideabi/4.6.x-google/../../../../arm-linux-androideabi/bin/ld: error: symbol fuse_teardown has undefined version FUSE_2.2collect2: ld returned 1 exit status修改lib/fuse_misc.h文件，将#define FUSE_SYMVER(x) __asm__(x)修改为#define FUSE_SYMVER(x)再次编译，出现如下错误：In file included from external/exfat-fuse/libexfat/exfat.h:33:0, from external/exfat-fuse/libexfat/cluster.c:23:external/exfat-fuse/libexfat/compiler.h:28:2: error: #error C99-compliant compiler is required修改./libexfat/compiler.h文件，将如下语句屏蔽掉：#if __STDC_VERSION__ < 199901L#error C99-compliant compiler is required#endif再次编译，此时编译通过了，那么继续接下来的修改吧。f.相应的库和工具编译好了，剩下上层来调用了，修改vold相关文件来实现：a).在Android源码的system/vold目录下添加exFat.h和exFat.cpp文件，相应的源码如下： exFat.h:#ifndef _EXFAT_H#define _EXFAT_H#include class exFat {public:static int doMount(const char *fsPath, const char *mountPoint, bool ro, int ownerUid);static int unMount(const char *mountPoint);static int format(const char *fsPath, unsigned int numSectors);};#endif exFat.cpp:#include #include #include #include #include #include #include #include #include #include #include #include #include #include #define LOG_TAG 'Vold'#include #include #include 'exFat.h'static char EXFAT_PATH[] = '/system/bin/mount.exfat';extern 'C' int logwrap(int argc, const char **argv, int background);extern 'C' int mount(const char *, const char *, const char *, unsigned long, const void *);int exFat::doMount(const char *fsPath, const char *mountPoint, bool ro, int ownerUid) {int rc = 0; do {if(!ro){const char *args[3];args[0] = EXFAT_PATH;args[1] = fsPath;args[2] = mountPoint;rc = logwrap(3, args, 1);SLOGI(' %s %s %s', EXFAT_PATH, fsPath, mountPoint);if(!rc){SLOGI('Mount EXFAT device form %s to %s OK',fsPath,mountPoint);char *lost_path;asprintf(&lost_path, '%s/LOST.DIR', mountPoint);if (access(lost_path, F_OK)) {/** Create a LOST.DIR in the root so we have somewhere to put* lost cluster chains (fsck_msdos doesn't currently do this)*/if (mkdir(lost_path, 0755)) {SLOGE('Unable to create LOST.DIR (%s)', strerror(errno));}}free(lost_path);return 0;}else{SLOGE('Mount EXFAT device form %s to %s failed',fsPath,mountPoint);return -1;}}else{const char *args[5];args[0] = EXFAT_PATH;args[1] = fsPath;args[2] = mountPoint;args[3] = '-o';args[4] = 'ro,uid=1000';rc = logwrap(5, args, 1);if(!rc){SLOGI('Mount EXFAT device form %s to %s OK.(Read-only)',fsPath,mountPoint);return 0;}else{SLOGE('Mount EXFAT device form %s to %s failed.(Read-only)',fsPath,mountPoint);return -1;}} } while (0); return rc;}int exFat::unMount(const char *mountPoint) {int rc = 0; do { const char *args[3]; args[0] = 'umount'; args[1] = mountPoint; args[2] = NULL; rc = logwrap(2, args, 1);if(!rc){SLOGI('unMount EXFAT device %s OK',mountPoint); return 0;}else{SLOGE('unMount EXFAT device %s failed',mountPoint);return -1;} } while (0); return rc;}int exFat::format(const char *fsPath, unsigned int numSectors) { return 0;}b).修改system/vold/Android.mk文件，在common_src_files量中将exFat.cpp添加进去；c).修改system/vold/Volume.cpp文件，进行如下修改： 添加#include 'exFat.h'一句； 修改int Volume::mountVol()函数中的如下语句：if (Fat::doMount(devicePath, '/mnt/secure/staging', false, false, false, AID_SYSTEM, gid, 0702, true)) { SLOGE('%s failed to mount via VFAT (%s)\n', devicePath, strerror(errno));continue; } 为if (Fat::doMount(devicePath, '/mnt/secure/staging', false, false, false, AID_SYSTEM, gid, 0702, true)) { SLOGE('%s failed to mount via VFAT (%s)\n', devicePath, strerror(errno));if(exFat::doMount(devicePath, '/mnt/secure/staging', false, 1000)){SLOGE('%s failed to mount via EXFAT (%s)\n', devicePath, strerror(errno)); continue;} } 至此，上层也修改好了，继续编译。g.编译好后烧录运行，Android跑起来后，插入64GB的exFAT文件系统的TF卡，其中logcat信息中有如下错误提示：I//system/bin/mount.exfat( 118): FUSE exfat 1.0.0I//system/bin/mount.exfat( 118): ERROR: failed to get size of `/dev/block/vold/179:1'.该问题从https://groups.google.com/forum/#!msg/exfat/Iei35MqkRGk/UeGSjnbzgQsJ可得知是一个已知问题，主要是fuse-exfat使用的LFS在Android native中没有提供相应的API函数，根据上面的提示，查找到该提示是在exfat-fuse目录中的./libexfat/io.c文件中的exfat_open处理，该函数会调用到exfat_seek，通过其来获得整个文件的大小，但该函数返回小于0的值，继续跟踪，该函数会调用到lseek函数，从http://fred-zone.blogspot.com/2011/02/io-offset.html了解到可通过两种方法处理，我们Android.mk里面包含了第一种方法，但无法处理，现在直接使用第二种方法来处理：修改exfat-fuse目录里的./libexfat/io.c文件，添加如下内容：#define lseek lseek64#define pread pread64#define pwrite pwrite64#define fcntl __fcntl64并将exfat-fuse目录里的所有.c和.h文件中的off_t替换为off64_t，重新编译烧录后，插上64GB的T卡后，有如下提示：I//system/bin/mount.exfat( 116): FUSE exfat 1.0.0I//system/bin/mount.exfat( 116): WARN: volume was not unmounted cleanly.I/Vold ( 116): /system/bin/mount.exfat /dev/block/vold/179:1 /mnt/external_sdI/Vold ( 116): Mount EXFAT device form /dev/block/vold/179:1 to /mnt/external_sd OK挂载成功了，测试可以读写卡，但拔掉卡后有如下提示：I/DEBUG ( 119): becae628 408f0940 [heap]I/DEBUG ( 119): becae62c 401b81b4 /system/lib/libc.soI/DEBUG ( 119): becae630 400e3602 /system/lib/libexfat.soI/DEBUG ( 119): becae634 0001c000 I/DEBUG ( 119): becae638 I/DEBUG ( 119): becae63c 401b81b4 /system/lib/libc.soI/DEBUG ( 119): becae640 400e3602 /system/lib/libexfat.soI/DEBUG ( 119): becae644 4018879c /system/lib/libc.so (__pthread_clone)I/DEBUG ( 119): #01 becae648 883d068a I/DEBUG ( 119): becae64c 400e0457 /system/lib/libexfat.so (exfat_bug+82)I/DEBUG ( 119): #02 becae650 becae66c [stack]I/DEBUG ( 119): becae654 becae66c [stack]I/DEBUG ( 119): becae658 04d00000 I/DEBUG ( 119): becae65c 04d00000 I/DEBUG ( 119): becae660 I/DEBUG ( 119): becae664 400e0095 /system/lib/libexfat.so (exfat_pread+36)I/DEBUG ( 119): becae668 400e3602 /system/lib/libexfat.so由此可以看到是libexfat的问题，从打印出来的栈信息，初步判断是exfat_bug涉及到影响，修改./libexfat/exfat.h文件，将如下语句：void exfat_bug(const char* format, ...) PRINTF NORETURN;void exfat_error(const char* format, ...) PRINTF;void exfat_warn(const char* format, ...) PRINTF;void exfat_debug(const char* format, ...) PRINTF;替换为#define exfat_debug(x...)#define exfat_bug(x...)#define exfat_warn(x...)#define exfat_error(x...) exfat_errors++再次编译，有如下错误提示：target thumb C: libexfat <= external/exfat-fuse/libexfat/log.cexternal/exfat-fuse/libexfat/log.c:34:1: error: expected identifier or '(' before '{' tokenexternal/exfat-fuse/libexfat/log.c:56:6: error: expected '=', ',', ';', 'asm' or '__attribute__' before '++' tokenexternal/exfat-fuse/libexfat/log.c:80:1: error: expected identifier or '(' before '{' tokenexternal/exfat-fuse/libexfat/log.c:101:1: error: expected identifier or '(' before '{' token修改./libexfat/log.c文件，将#include 'exfat.h'屏蔽掉，再次编译，有如下错误提示：external/exfat-fuse/libexfat/lookup.c: In function 'exfat_split':external/exfat-fuse/libexfat/lookup.c:225:1: error: control reaches end of non-void function [-Werror=return-type]cc1: some warnings being treated as errors修改./libexfat/lookup.c文件，在exfat_split函数最后加上return 0;语句，再次编译，有如下错误提示：external/exfat-fuse/mkfs/mkexfat.c: In function 'get_position':external/exfat-fuse/mkfs/mkexfat.c:162:1: error: control reaches end of non-void function [-Werror=return-type]cc1: some warnings being treated as errors修改./mkfs/mkexfat.c文件，在get_position函数中最后加上return 0;语句，再次编译，未发现错误，烧录后，插拔TF卡未见明显异常信息。至此，移植告一段落了，待后期使用测试了。END
