CyanogenMod 10 修改 Vold 使 Android 自动挂载 NTFS 和 exFAT 格式的 SD 卡
2015-03-10 08:53
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AndroidNTFSexFAT自动挂载源代码
目录(?)[+]
Android 不支持 NTFS 和 exFAT 格式的文件系统，但是 Linux 已经有相应的开源代码了，因此只需将其移植到 Android 上即可。
这里需要下载两份代码，分别是 ntfs-3g 和 exfat。下载地址 ntfs-3g exfat 。
由于 Android 并没有使用完整的 glibc 库，因此需要对源代码进行修改以使代码能被顺利地编译。
代码与编译好的文件都可以在 CSDN 资源里下载：
CyanogenMod10 ntfs 与 exfat 自动挂载支持
将
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sfs->f_favail = sfs->f_bfree >> ef.sb->spc_bits;
sfs->f_ffree = sfs->f_bavail;
改为
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sfs->f_ffree = sfs->f_bfree >> ef.sb->spc_bits;
大约位于 283 行的 exfat_pread 函数，将里面的 pread 函数改为 pread64；
大约位于 295 行的 exfat_pwrite 函数，将里面的 pwrite 函数改为 pwrite64。
在 system 目录新建 libfuse 文件夹，并建立子文件夹 src 和 include。将 ntfs-3g 中 libfuse-lite 中的所有文件复制到 libfuse/src 目录中，将 ntfs-3g 中 include/fuse-lite 中的所有文件复制到 libfuse/include 目录中，将 ntfs-3g 中的 config.h 复制到 libfuse 目录。
修改 libfuse/src/helper.c，在最后添加如下代码(exfat 需要)：
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int fuse_daemonize(int foreground)
{
int res;
if (!foreground) {
res = daemon(0, 0);
if (res == -1) {
perror("fuse: failed to daemonize program\n");
return -1;
}
}
return 0;
}
在 libfuse 目录编写 Android.mk：
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LOCAL_PATH:= $(call my-dir)
include $(CLEAR_VARS)
LOCAL_SRC_FILES:= \
src/fuse.c \
src/fusermount.c \
src/fuse_kern_chan.c \
src/fuse_loop.c \
src/fuse_lowlevel.c \
src/fuse_opt.c \
src/fuse_session.c \
src/fuse_signals.c \
src/helper.c \
src/mount.c \
src/mount_util.c
LOCAL_C_INCLUDES:= $(LOCAL_PATH)/include
LOCAL_CFLAGS:= -O2 -g -W -Wall -D_LARGEFILE_SOURCE -D_FILE_OFFSET_BITS=64 -DHAVE_CONFIG_H
LOCAL_MODULE:= libfuse
LOCAL_MODULE_TAGS:=eng
LOCAL_SYSTEM_SHARED_LIBRARIES:= libc libcutils
include $(BUILD_STATIC_LIBRARY)
在 system 目录新建 ntfs-3g 文件夹，并建立子文件夹 include、libntfs-3g 和 src。将 ntfs-3g 中 include/ntfs-3g 中的所有文件复制到 ntfs-3g/include 目录中，将 ntfs-3g 中 libntfs-3g 中的所有文件复制到 ntfs-3g/libntfs-3g 目录中，将 ntfs-3g 中 src 目录中的 ntfs-3g.c ntfs-3g_common.c ntfs-3g_common.h
复制到 ntfs-3g/src 目录中，将 ntfs-3g 中的 config.h 复制到 ntfs-3g 目录。
在 ntfs-3g 目录中编写 Android.mk：
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LOCAL_PATH:= $(call my-dir)
include $(CLEAR_VARS)
LOCAL_SRC_FILES:= \
libntfs-3g/acls.c libntfs-3g/attrib.c libntfs-3g/attrlist.c \
libntfs-3g/bitmap.c libntfs-3g/bootsect.c libntfs-3g/cache.c \
libntfs-3g/collate.c libntfs-3g/compat.c libntfs-3g/compress.c \
libntfs-3g/debug.c libntfs-3g/device.c libntfs-3g/dir.c \
libntfs-3g/efs.c libntfs-3g/index.c libntfs-3g/inode.c \
libntfs-3g/lcnalloc.c libntfs-3g/logfile.c libntfs-3g/logging.c \
libntfs-3g/mft.c libntfs-3g/misc.c libntfs-3g/mst.c \
libntfs-3g/object_id.c libntfs-3g/realpath.c libntfs-3g/reparse.c \
libntfs-3g/runlist.c libntfs-3g/security.c libntfs-3g/unistr.c \
libntfs-3g/unix_io.c libntfs-3g/volume.c
LOCAL_C_INCLUDES:= $(LOCAL_PATH)/include system/libfuse/include
LOCAL_CFLAGS:= -O2 -g -W -Wall -D_LARGEFILE_SOURCE -D_FILE_OFFSET_BITS=64 -DHAVE_CONFIG_H
LOCAL_MODULE:= libntfs-3g
LOCAL_MODULE_TAGS:=eng
LOCAL_SYSTEM_SHARED_LIBRARIES:= libc libcutils
include $(BUILD_STATIC_LIBRARY)
include $(CLEAR_VARS)
LOCAL_SRC_FILES:= \
src/ntfs-3g.c src/ntfs-3g_common.c
LOCAL_C_INCLUDES:= $(LOCAL_PATH)/include $(LOCAL_PATH)/src system/libfuse/include
LOCAL_CFLAGS:= -O2 -g -W -Wall -D_LARGEFILE_SOURCE -D_FILE_OFFSET_BITS=64 -DHAVE_CONFIG_H
LOCAL_MODULE:= ntfs-3g
LOCAL_MODULE_TAGS:=eng
LOCAL_SYSTEM_SHARED_LIBRARIES:= libc
LOCAL_STATIC_LIBRARIES:= libfuse libntfs-3g
include $(BUILD_EXECUTABLE)
在 system 目录下建立 ntfsfix 目录，并建立子目录 src。将 ntfs-3g 中 ntfsprogs 中的 ntfsfix.c sd.c sd.h utils.c utils.h 复制到 ntfsfix/src 目录，将 ntfs-3g 中的 config.h 复制到 ntfsfix 目录。
在 ntfsfix 目录下建立 Android.mk：
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LOCAL_PATH:= $(call my-dir)
include $(CLEAR_VARS)
LOCAL_SRC_FILES:= \
src/ntfsfix.c \
src/utils.c \
src/sd.c
LOCAL_C_INCLUDES:= $(LOCAL_PATH)/src system/ntfs-3g/include
LOCAL_CFLAGS:= -O2 -g -W -Wall -D_LARGEFILE_SOURCE -D_FILE_OFFSET_BITS=64 -DHAVE_CONFIG_H
LOCAL_MODULE:= ntfsfix
LOCAL_MODULE_TAGS:=eng
LOCAL_SYSTEM_SHARED_LIBRARIES:= libc
LOCAL_STATIC_LIBRARIES:= libntfs-3g libfuse
include $(BUILD_EXECUTABLE)
在 system 目录下建立 mkntfs 目录，并建立子目录 src。将 ntfs-3g 中 ntfsprogs 中的 attrdef.c attrdef.h boot.c boot.h mkntfs.c sd.c sd.h utils.c utils.h 复制到 mkntfs/src 目录，将 ntfs-3g 中的 config.h 复制到 mkntfs 目录。
在 mkntfs 目录下建立 Android.mk：
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LOCAL_PATH:= $(call my-dir)
include $(CLEAR_VARS)
LOCAL_SRC_FILES:= \
src/attrdef.c \
src/boot.c \
src/utils.c \
src/mkntfs.c \
src/sd.c
LOCAL_C_INCLUDES:= $(LOCAL_PATH)/src system/ntfs-3g/include
LOCAL_CFLAGS:= -O2 -g -W -Wall -D_LARGEFILE_SOURCE -D_FILE_OFFSET_BITS=64 -DHAVE_CONFIG_H
LOCAL_MODULE:= mkntfs
LOCAL_MODULE_TAGS:=eng
LOCAL_SYSTEM_SHARED_LIBRARIES:= libc
LOCAL_STATIC_LIBRARIES:= libntfs-3g libfuse
include $(BUILD_EXECUTABLE)
在 system 目录下建立 exfat 目录。将 exfat 源代码中的 fuse 和 libexfat 文件夹复制到 exfat 目录中。
建立 Android.mk：
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LOCAL_PATH:= $(call my-dir)
include $(CLEAR_VARS)
LOCAL_SRC_FILES:= \
libexfat/cluster.c libexfat/io.c libexfat/log.c \
libexfat/lookup.c libexfat/mount.c libexfat/node.c \
libexfat/time.c libexfat/utf.c libexfat/utils.c
LOCAL_C_INCLUDES:= $(LOCAL_PATH)/libexfat system/libfuse/include
LOCAL_CFLAGS:= -O2 -g -W -Wall -D_LARGEFILE_SOURCE -D_FILE_OFFSET_BITS=64 -UUSE_UBLIO
LOCAL_MODULE:= libexfat
LOCAL_MODULE_TAGS:=eng
LOCAL_SYSTEM_SHARED_LIBRARIES:= libc libcutils
include $(BUILD_STATIC_LIBRARY)
include $(CLEAR_VARS)
LOCAL_SRC_FILES:= \
fuse/main.c
LOCAL_C_INCLUDES:= $(LOCAL_PATH)/libexfat system/libfuse/include
LOCAL_CFLAGS:= -O2 -g -W -Wall -D_LARGEFILE_SOURCE -D_FILE_OFFSET_BITS=64 -DUSE_UBLIO
LOCAL_MODULE:= exfat
LOCAL_MODULE_TAGS:=eng
LOCAL_SYSTEM_SHARED_LIBRARIES:= libc
LOCAL_STATIC_LIBRARIES:= libfuse libexfat
include $(BUILD_EXECUTABLE)
在 system 目录建立 exfatfsck 目录，并将 exfat 源代码中 fsck/main.c 复制到 exfatfsck 目录中。
建立 Android.mk(这里只列出关键的两行)：
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LOCAL_SRC_FILES:= \
main.c
LOCAL_C_INCLUDES:= $(LOCAL_PATH)/src system/exfat/libexfat
在 system 目录下建立 mkexfatfs 目录，并建立子目录 src。将 exfat 源代码中 mkfs 目录下的所有文件复制到 mkexfatfs/src 目录中。
建立 Android.mk(关键部分)：
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LOCAL_SRC_FILES:= \
src/cbm.c \
src/fat.c \
src/main.c \
src/mkexfat.c \
src/rootdir.c \
src/uct.c \
src/uctc.c \
src/vbr.c
LOCAL_C_INCLUDES:= $(LOCAL_PATH)/src system/exfat/libexfat
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static char MOUNT_NTFS_PATH[] = "/system/bin/ntfs-3g";
static char MKNTFS_PATH[] = "/system/bin/mkntfs";
static char NTFSFIX_PATH[] = "/system/bin/ntfsfix";
check 函数：
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int Ntfs::check(const char *fsPath) {
bool rw = true;
if (access(NTFSFIX_PATH, X_OK)) {
SLOGW("Skipping fs checks\n");
return 0;
}
int rc = -1;
do {
const char *args[3];
args[0] = NTFSFIX_PATH;
args[1] = fsPath;
args[2] = NULL;
rc = logwrap(3, args, 1);
switch(rc) {
case 0:
SLOGI("NTFS Filesystem check completed OK.\n");
return 0;
case 1:
SLOGI("NTFS Filesystem check failed.\n");
return 0;
default:
SLOGE("NTFS Filesystem check failed (unknown exit code %d).\n", rc);
errno = EIO;
return -1;
}
} while (0);
return 0;
}
doMount 函数：
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int Ntfs::doMount(const char *fsPath, const char *mountPoint,
bool ro, bool remount, bool executable,
int ownerUid, int ownerGid, int permMask, bool createLost) {
int rc;
unsigned long flags;
char mountData[255];
char options[255] = {};
const char *args[6];
flags = MS_NODEV | MS_NOSUID | MS_DIRSYNC;
flags |= (executable ? 0 : MS_NOEXEC);
flags |= (ro ? MS_RDONLY : 0);
flags |= (remount ? MS_REMOUNT : 0);
// Testing/security, mount ro up to now
flags |= MS_RDONLY;
/*
* Note: This is a temporary hack. If the sampling profiler is enabled,
* we make the SD card world-writable so any process can write snapshots.
*
* TODO: Remove this code once we have a drop box in system_server.
*/
char value[PROPERTY_VALUE_MAX];
property_get("persist.sampling_profiler", value, "");
if (value[0] == '1') {
SLOGW("The SD card is world-writable because the"
" 'persist.sampling_profiler' system property is set to '1'.");
permMask = 0;
}
sprintf(mountData,
"uid=%d,gid=%d,fmask=%o,dmask=%o",
ownerUid, ownerGid, permMask, permMask);
if (!remount) {
SLOGI("Trying to use ntfs-3g program to mount %s", fsPath);
if (ro)
snprintf(options, sizeof(options), "ro,%s", mountData);
else
snprintf(options, sizeof(options), "%s", mountData);
args[0] = MOUNT_NTFS_PATH;
args[1] = "-o";
args[2] = options;
args[3] = fsPath;
args[4] = mountPoint;
args[5] = NULL;
rc = logwrap(6, args, 1);
if (rc == 0) {
SLOGI("ntfs-3g executed successfully.");
} else {
SLOGE("Failed to execute ntfs-3g.");
}
} else {
rc = mount(fsPath, mountPoint, "fuseblk", flags, mountData);
}
if (rc && errno == EROFS) {
SLOGE("%s appears to be a read only filesystem - retrying mount RO", fsPath);
flags |= MS_RDONLY;
if (!remount) {
SLOGI("Trying to use ntfs-3g program to mount %s as read-only", fsPath);
snprintf(options, sizeof(options), "ro,%s", mountData);
args[0] = MOUNT_NTFS_PATH;
args[1] = "-o";
args[2] = options;
args[3] = fsPath;
args[4] = mountPoint;
args[5] = NULL;
rc = logwrap(6, args, 1);
if (rc == 0) {
SLOGI("ntfs-3g executed successfully for read-only.");
} else {
SLOGE("Failed to execute ntfs-3g for read-only.");
}
} else {
rc = mount(fsPath, mountPoint, "fuseblk", flags, mountData);
}
}
return rc;
}
format 函数：
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int Ntfs::format(const char *fsPath, unsigned int numSectors) {
const char *args[5];
char strNumOfSectors[16] = {};
int rc;
args[0] = MKNTFS_PATH;
args[1] = "-f";
args[2] = fsPath;
if (numSectors) {
snprintf(strNumOfSectors, sizeof(strNumOfSectors), "%u", numSectors);
args[3] = strNumOfSectors;
args[4] = NULL;
rc = logwrap(5, args, 1);
} else {
args[3] = NULL;
rc = logwrap(4, args, 1);
}
if (rc == 0) {
SLOGI("Filesystem formatted OK");
return 0;
} else {
SLOGE("Format failed (unknown exit code %d)", rc);
errno = EIO;
return -1;
}
return 0;
}
关键代码：
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static char MOUNT_EXFAT_PATH[] = "/system/bin/exfat";
static char MKFS_EXFAT_PATH[] = "/system/bin/mkexfatfs";
static char FSCK_EXFAT_PATH[] = "/system/bin/exfatfsck";
int ExFat::check(const char *fsPath) {
bool rw = true;
if (access(FSCK_EXFAT_PATH, X_OK)) {
SLOGW("Skipping fs checks\n");
return 0;
}
int rc = -1;
do {
const char *args[3];
args[0] = FSCK_EXFAT_PATH;
args[1] = fsPath;
args[2] = NULL;
rc = logwrap(3, args, 1);
switch(rc) {
case 0:
SLOGI("exFAT Filesystem check completed OK.\n");
return 0;
case 1:
SLOGI("exFAT Filesystem check failed.\n");
return 0;
default:
SLOGE("exFAT Filesystem check failed (unknown exit code %d).\n", rc);
errno = EIO;
return -1;
}
} while (0);
return 0;
}
int ExFat::doMount(const char *fsPath, const char *mountPoint,
bool ro, bool remount, bool executable,
int ownerUid, int ownerGid, int permMask, bool createLost) {
int rc;
unsigned long flags;
char mountData[255];
const char *args[4];
flags = MS_NODEV | MS_NOSUID | MS_DIRSYNC;
flags |= (executable ? 0 : MS_NOEXEC);
flags |= (ro ? MS_RDONLY : 0);
flags |= (remount ? MS_REMOUNT : 0);
// Testing/security, mount ro up to now
flags |= MS_RDONLY;
sprintf(mountData,
"uid=%d,gid=%d,fmask=%o,dmask=%o",
ownerUid, ownerGid, permMask, permMask);
if (!remount) {
SLOGI("Trying to use exfat program to mount %s", fsPath);
args[0] = MOUNT_EXFAT_PATH;
args[1] = fsPath;
args[2] = mountPoint;
args[3] = NULL;
rc = logwrap(4, args, 1);
if (rc == 0) {
SLOGI("exfat executed successfully.");
} else {
SLOGE("Failed to execute exfat.");
}
} else {
rc = mount(fsPath, mountPoint, "fuseblk", flags, mountData);
}
return rc;
}
int ExFat::format(const char *fsPath, unsigned int numSectors) {
const char *args[3];
char strNumOfSectors[16] = {};
int rc;
args[0] = MKFS_EXFAT_PATH;
args[1] = fsPath;
args[2] = NULL;
rc = logwrap(3, args, 1);
if (rc == 0) {
SLOGI("Filesystem formatted OK");
return 0;
} else {
SLOGE("Format failed (unknown exit code %d)", rc);
errno = EIO;
return -1;
}
return 0;
}
找到 Volume::mountVol() 函数
找到 else if (strcmp(fstype, "ntfs") == 0) 部分，在后面添加以下代码：
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if (Ntfs::check(devicePath)) {
errno = EIO;
/* Badness - abort the mount */
SLOGE("%s failed FS checks (%s)", devicePath, strerror(errno));
setState(Volume::State_Idle);
free(fstype);
return -1;
}
找到和 if (fstype != NULL) 对应的 else 块，在后面添加以下代码：
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//Check if the filesystem is exFAT
FILE *volf = fopen(devicePath, "rb");
int bytesRead = 0;
if (volf) {
char fschar[5];
//Read the signature in the PBR
fseek(volf, 3, SEEK_SET);
bytesRead = fread(fschar, 1, 5, volf);
fclose(volf);
if (bytesRead == 5 && strcmp(fschar, "EXFAT") == 0) {
if (ExFat::check(devicePath)) {
errno = EIO;
/* Badness - abort the mount */
SLOGE("%s failed FS checks (%s)", devicePath, strerror(errno));
setState(Volume::State_Idle);
free(fstype);
return -1;
}
if (ExFat::doMount(devicePath, "/mnt/secure/staging", false, false, false,
AID_SYSTEM, gid, 0702, true)) {
SLOGE("%s failed to mount via exFAT (%s)\n", devicePath, strerror(errno));
continue;
} else {
goto mountSuccess;
}
}
}
然后转到 if (fstype != NULL) 的 else 的末尾，在语句块之后，SLOGI("Device %s, target %s mounted @ /mnt/secure/staging", devicePath, getMountpoint()); 之前添加 mountSuccess: 跳转标签。
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PRODUCT_PACKAGES += \
libfuse \
ntfs-3g \
exfat \
mkntfs \
ntfsfix \
mkexfatfs \
exfatfsck
AndroidNTFSexFAT自动挂载源代码
目录(?)[+]
Android 不支持 NTFS 和 exFAT 格式的文件系统，但是 Linux 已经有相应的开源代码了，因此只需将其移植到 Android 上即可。
这里需要下载两份代码，分别是 ntfs-3g 和 exfat。下载地址 ntfs-3g exfat 。
由于 Android 并没有使用完整的 glibc 库，因此需要对源代码进行修改以使代码能被顺利地编译。
代码与编译好的文件都可以在 CSDN 资源里下载：
CyanogenMod10 ntfs 与 exfat 自动挂载支持
一、修改 ntfs-3g 代码
关于 ntfs-3g 代码的修改，可以参考 CSDN 上的这篇文章：ntfs-3g移植到android4.0.3方法总结。这里就不在重复叙述了。二、修改 exfat 代码
exfat 也是使用了 fuse，但代码量很小。需要修改的地方不多：1、fuse/main.c 文件
大约位于 264 行的 fuse_exfat_statfs 函数，将参数中的 statvfs 改为 statfs，并将其代码中的 sfs->f_namemax 改为 sfs->f_namelen将
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sfs->f_favail = sfs->f_bfree >> ef.sb->spc_bits;
sfs->f_ffree = sfs->f_bavail;
改为
[cpp] view
plaincopy
sfs->f_ffree = sfs->f_bfree >> ef.sb->spc_bits;
2、libexfat/io.c
大约位于 255 行的 exfat_seek 函数，将里面的 lseek 函数改为 lseek64；大约位于 283 行的 exfat_pread 函数，将里面的 pread 函数改为 pread64；
大约位于 295 行的 exfat_pwrite 函数，将里面的 pwrite 函数改为 pwrite64。
3、将所有代码文件中的 off_t 类型全部换为 off64_t 类型
Android 的编译器编译出来的 off_t 类型是4字节的，只有改为 off64_t 才是8字节的。不改的话无法挂载超过 4G 的 SD 卡或 U 盘。三、提取文件，编写 Android.mk 文件
这里我将所有的项目都放在了和 vold 同级的 system 目录下1、libfuse
由于 ntfs-3g 和 exfat 都使用了 fuse，因此他们可以共享这个库。在 system 目录新建 libfuse 文件夹，并建立子文件夹 src 和 include。将 ntfs-3g 中 libfuse-lite 中的所有文件复制到 libfuse/src 目录中，将 ntfs-3g 中 include/fuse-lite 中的所有文件复制到 libfuse/include 目录中，将 ntfs-3g 中的 config.h 复制到 libfuse 目录。
修改 libfuse/src/helper.c，在最后添加如下代码(exfat 需要)：
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int fuse_daemonize(int foreground)
{
int res;
if (!foreground) {
res = daemon(0, 0);
if (res == -1) {
perror("fuse: failed to daemonize program\n");
return -1;
}
}
return 0;
}
在 libfuse 目录编写 Android.mk：
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LOCAL_PATH:= $(call my-dir)
include $(CLEAR_VARS)
LOCAL_SRC_FILES:= \
src/fuse.c \
src/fusermount.c \
src/fuse_kern_chan.c \
src/fuse_loop.c \
src/fuse_lowlevel.c \
src/fuse_opt.c \
src/fuse_session.c \
src/fuse_signals.c \
src/helper.c \
src/mount.c \
src/mount_util.c
LOCAL_C_INCLUDES:= $(LOCAL_PATH)/include
LOCAL_CFLAGS:= -O2 -g -W -Wall -D_LARGEFILE_SOURCE -D_FILE_OFFSET_BITS=64 -DHAVE_CONFIG_H
LOCAL_MODULE:= libfuse
LOCAL_MODULE_TAGS:=eng
LOCAL_SYSTEM_SHARED_LIBRARIES:= libc libcutils
include $(BUILD_STATIC_LIBRARY)
2、ntfs-3g
则里只提取挂载 NTFS 分区的文件。在 system 目录新建 ntfs-3g 文件夹，并建立子文件夹 include、libntfs-3g 和 src。将 ntfs-3g 中 include/ntfs-3g 中的所有文件复制到 ntfs-3g/include 目录中，将 ntfs-3g 中 libntfs-3g 中的所有文件复制到 ntfs-3g/libntfs-3g 目录中，将 ntfs-3g 中 src 目录中的 ntfs-3g.c ntfs-3g_common.c ntfs-3g_common.h
复制到 ntfs-3g/src 目录中，将 ntfs-3g 中的 config.h 复制到 ntfs-3g 目录。
在 ntfs-3g 目录中编写 Android.mk：
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LOCAL_PATH:= $(call my-dir)
include $(CLEAR_VARS)
LOCAL_SRC_FILES:= \
libntfs-3g/acls.c libntfs-3g/attrib.c libntfs-3g/attrlist.c \
libntfs-3g/bitmap.c libntfs-3g/bootsect.c libntfs-3g/cache.c \
libntfs-3g/collate.c libntfs-3g/compat.c libntfs-3g/compress.c \
libntfs-3g/debug.c libntfs-3g/device.c libntfs-3g/dir.c \
libntfs-3g/efs.c libntfs-3g/index.c libntfs-3g/inode.c \
libntfs-3g/lcnalloc.c libntfs-3g/logfile.c libntfs-3g/logging.c \
libntfs-3g/mft.c libntfs-3g/misc.c libntfs-3g/mst.c \
libntfs-3g/object_id.c libntfs-3g/realpath.c libntfs-3g/reparse.c \
libntfs-3g/runlist.c libntfs-3g/security.c libntfs-3g/unistr.c \
libntfs-3g/unix_io.c libntfs-3g/volume.c
LOCAL_C_INCLUDES:= $(LOCAL_PATH)/include system/libfuse/include
LOCAL_CFLAGS:= -O2 -g -W -Wall -D_LARGEFILE_SOURCE -D_FILE_OFFSET_BITS=64 -DHAVE_CONFIG_H
LOCAL_MODULE:= libntfs-3g
LOCAL_MODULE_TAGS:=eng
LOCAL_SYSTEM_SHARED_LIBRARIES:= libc libcutils
include $(BUILD_STATIC_LIBRARY)
include $(CLEAR_VARS)
LOCAL_SRC_FILES:= \
src/ntfs-3g.c src/ntfs-3g_common.c
LOCAL_C_INCLUDES:= $(LOCAL_PATH)/include $(LOCAL_PATH)/src system/libfuse/include
LOCAL_CFLAGS:= -O2 -g -W -Wall -D_LARGEFILE_SOURCE -D_FILE_OFFSET_BITS=64 -DHAVE_CONFIG_H
LOCAL_MODULE:= ntfs-3g
LOCAL_MODULE_TAGS:=eng
LOCAL_SYSTEM_SHARED_LIBRARIES:= libc
LOCAL_STATIC_LIBRARIES:= libfuse libntfs-3g
include $(BUILD_EXECUTABLE)
3、ntfsfix
这个是用来在挂载 NTFS 分区前检查错误的。在 system 目录下建立 ntfsfix 目录，并建立子目录 src。将 ntfs-3g 中 ntfsprogs 中的 ntfsfix.c sd.c sd.h utils.c utils.h 复制到 ntfsfix/src 目录，将 ntfs-3g 中的 config.h 复制到 ntfsfix 目录。
在 ntfsfix 目录下建立 Android.mk：
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LOCAL_PATH:= $(call my-dir)
include $(CLEAR_VARS)
LOCAL_SRC_FILES:= \
src/ntfsfix.c \
src/utils.c \
src/sd.c
LOCAL_C_INCLUDES:= $(LOCAL_PATH)/src system/ntfs-3g/include
LOCAL_CFLAGS:= -O2 -g -W -Wall -D_LARGEFILE_SOURCE -D_FILE_OFFSET_BITS=64 -DHAVE_CONFIG_H
LOCAL_MODULE:= ntfsfix
LOCAL_MODULE_TAGS:=eng
LOCAL_SYSTEM_SHARED_LIBRARIES:= libc
LOCAL_STATIC_LIBRARIES:= libntfs-3g libfuse
include $(BUILD_EXECUTABLE)
4、mkntfs
这个是用来格式化分区为 NTFS 格式的。在 system 目录下建立 mkntfs 目录，并建立子目录 src。将 ntfs-3g 中 ntfsprogs 中的 attrdef.c attrdef.h boot.c boot.h mkntfs.c sd.c sd.h utils.c utils.h 复制到 mkntfs/src 目录，将 ntfs-3g 中的 config.h 复制到 mkntfs 目录。
在 mkntfs 目录下建立 Android.mk：
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LOCAL_PATH:= $(call my-dir)
include $(CLEAR_VARS)
LOCAL_SRC_FILES:= \
src/attrdef.c \
src/boot.c \
src/utils.c \
src/mkntfs.c \
src/sd.c
LOCAL_C_INCLUDES:= $(LOCAL_PATH)/src system/ntfs-3g/include
LOCAL_CFLAGS:= -O2 -g -W -Wall -D_LARGEFILE_SOURCE -D_FILE_OFFSET_BITS=64 -DHAVE_CONFIG_H
LOCAL_MODULE:= mkntfs
LOCAL_MODULE_TAGS:=eng
LOCAL_SYSTEM_SHARED_LIBRARIES:= libc
LOCAL_STATIC_LIBRARIES:= libntfs-3g libfuse
include $(BUILD_EXECUTABLE)
5、exfat
这里只提取挂载 exFAT 分区所需的文件。在 system 目录下建立 exfat 目录。将 exfat 源代码中的 fuse 和 libexfat 文件夹复制到 exfat 目录中。
建立 Android.mk：
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LOCAL_PATH:= $(call my-dir)
include $(CLEAR_VARS)
LOCAL_SRC_FILES:= \
libexfat/cluster.c libexfat/io.c libexfat/log.c \
libexfat/lookup.c libexfat/mount.c libexfat/node.c \
libexfat/time.c libexfat/utf.c libexfat/utils.c
LOCAL_C_INCLUDES:= $(LOCAL_PATH)/libexfat system/libfuse/include
LOCAL_CFLAGS:= -O2 -g -W -Wall -D_LARGEFILE_SOURCE -D_FILE_OFFSET_BITS=64 -UUSE_UBLIO
LOCAL_MODULE:= libexfat
LOCAL_MODULE_TAGS:=eng
LOCAL_SYSTEM_SHARED_LIBRARIES:= libc libcutils
include $(BUILD_STATIC_LIBRARY)
include $(CLEAR_VARS)
LOCAL_SRC_FILES:= \
fuse/main.c
LOCAL_C_INCLUDES:= $(LOCAL_PATH)/libexfat system/libfuse/include
LOCAL_CFLAGS:= -O2 -g -W -Wall -D_LARGEFILE_SOURCE -D_FILE_OFFSET_BITS=64 -DUSE_UBLIO
LOCAL_MODULE:= exfat
LOCAL_MODULE_TAGS:=eng
LOCAL_SYSTEM_SHARED_LIBRARIES:= libc
LOCAL_STATIC_LIBRARIES:= libfuse libexfat
include $(BUILD_EXECUTABLE)
6、exfatfsck
这个是用来在挂载 exFAT 分区前检查错误的。在 system 目录建立 exfatfsck 目录，并将 exfat 源代码中 fsck/main.c 复制到 exfatfsck 目录中。
建立 Android.mk(这里只列出关键的两行)：
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LOCAL_SRC_FILES:= \
main.c
LOCAL_C_INCLUDES:= $(LOCAL_PATH)/src system/exfat/libexfat
7、mkexfatfs
这个是用来格式化分区为 exFAT 格式的。在 system 目录下建立 mkexfatfs 目录，并建立子目录 src。将 exfat 源代码中 mkfs 目录下的所有文件复制到 mkexfatfs/src 目录中。
建立 Android.mk(关键部分)：
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LOCAL_SRC_FILES:= \
src/cbm.c \
src/fat.c \
src/main.c \
src/mkexfat.c \
src/rootdir.c \
src/uct.c \
src/uctc.c \
src/vbr.c
LOCAL_C_INCLUDES:= $(LOCAL_PATH)/src system/exfat/libexfat
四、修改 vold 代码
CyanogenMod 的 vold 代码包含了 Ntfs.cpp 和 Ntfs.h，但是需要修改1、修改 Ntfs.cpp
添加全局变量：[cpp] view
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static char MOUNT_NTFS_PATH[] = "/system/bin/ntfs-3g";
static char MKNTFS_PATH[] = "/system/bin/mkntfs";
static char NTFSFIX_PATH[] = "/system/bin/ntfsfix";
check 函数：
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int Ntfs::check(const char *fsPath) {
bool rw = true;
if (access(NTFSFIX_PATH, X_OK)) {
SLOGW("Skipping fs checks\n");
return 0;
}
int rc = -1;
do {
const char *args[3];
args[0] = NTFSFIX_PATH;
args[1] = fsPath;
args[2] = NULL;
rc = logwrap(3, args, 1);
switch(rc) {
case 0:
SLOGI("NTFS Filesystem check completed OK.\n");
return 0;
case 1:
SLOGI("NTFS Filesystem check failed.\n");
return 0;
default:
SLOGE("NTFS Filesystem check failed (unknown exit code %d).\n", rc);
errno = EIO;
return -1;
}
} while (0);
return 0;
}
doMount 函数：
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int Ntfs::doMount(const char *fsPath, const char *mountPoint,
bool ro, bool remount, bool executable,
int ownerUid, int ownerGid, int permMask, bool createLost) {
int rc;
unsigned long flags;
char mountData[255];
char options[255] = {};
const char *args[6];
flags = MS_NODEV | MS_NOSUID | MS_DIRSYNC;
flags |= (executable ? 0 : MS_NOEXEC);
flags |= (ro ? MS_RDONLY : 0);
flags |= (remount ? MS_REMOUNT : 0);
// Testing/security, mount ro up to now
flags |= MS_RDONLY;
/*
* Note: This is a temporary hack. If the sampling profiler is enabled,
* we make the SD card world-writable so any process can write snapshots.
*
* TODO: Remove this code once we have a drop box in system_server.
*/
char value[PROPERTY_VALUE_MAX];
property_get("persist.sampling_profiler", value, "");
if (value[0] == '1') {
SLOGW("The SD card is world-writable because the"
" 'persist.sampling_profiler' system property is set to '1'.");
permMask = 0;
}
sprintf(mountData,
"uid=%d,gid=%d,fmask=%o,dmask=%o",
ownerUid, ownerGid, permMask, permMask);
if (!remount) {
SLOGI("Trying to use ntfs-3g program to mount %s", fsPath);
if (ro)
snprintf(options, sizeof(options), "ro,%s", mountData);
else
snprintf(options, sizeof(options), "%s", mountData);
args[0] = MOUNT_NTFS_PATH;
args[1] = "-o";
args[2] = options;
args[3] = fsPath;
args[4] = mountPoint;
args[5] = NULL;
rc = logwrap(6, args, 1);
if (rc == 0) {
SLOGI("ntfs-3g executed successfully.");
} else {
SLOGE("Failed to execute ntfs-3g.");
}
} else {
rc = mount(fsPath, mountPoint, "fuseblk", flags, mountData);
}
if (rc && errno == EROFS) {
SLOGE("%s appears to be a read only filesystem - retrying mount RO", fsPath);
flags |= MS_RDONLY;
if (!remount) {
SLOGI("Trying to use ntfs-3g program to mount %s as read-only", fsPath);
snprintf(options, sizeof(options), "ro,%s", mountData);
args[0] = MOUNT_NTFS_PATH;
args[1] = "-o";
args[2] = options;
args[3] = fsPath;
args[4] = mountPoint;
args[5] = NULL;
rc = logwrap(6, args, 1);
if (rc == 0) {
SLOGI("ntfs-3g executed successfully for read-only.");
} else {
SLOGE("Failed to execute ntfs-3g for read-only.");
}
} else {
rc = mount(fsPath, mountPoint, "fuseblk", flags, mountData);
}
}
return rc;
}
format 函数：
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int Ntfs::format(const char *fsPath, unsigned int numSectors) {
const char *args[5];
char strNumOfSectors[16] = {};
int rc;
args[0] = MKNTFS_PATH;
args[1] = "-f";
args[2] = fsPath;
if (numSectors) {
snprintf(strNumOfSectors, sizeof(strNumOfSectors), "%u", numSectors);
args[3] = strNumOfSectors;
args[4] = NULL;
rc = logwrap(5, args, 1);
} else {
args[3] = NULL;
rc = logwrap(4, args, 1);
}
if (rc == 0) {
SLOGI("Filesystem formatted OK");
return 0;
} else {
SLOGE("Format failed (unknown exit code %d)", rc);
errno = EIO;
return -1;
}
return 0;
}
2、添加 ExFat.h 和 ExFat.cpp
这里请使用 Ntfs.h 和 Ntfs.cpp 作为模板。关键代码：
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static char MOUNT_EXFAT_PATH[] = "/system/bin/exfat";
static char MKFS_EXFAT_PATH[] = "/system/bin/mkexfatfs";
static char FSCK_EXFAT_PATH[] = "/system/bin/exfatfsck";
int ExFat::check(const char *fsPath) {
bool rw = true;
if (access(FSCK_EXFAT_PATH, X_OK)) {
SLOGW("Skipping fs checks\n");
return 0;
}
int rc = -1;
do {
const char *args[3];
args[0] = FSCK_EXFAT_PATH;
args[1] = fsPath;
args[2] = NULL;
rc = logwrap(3, args, 1);
switch(rc) {
case 0:
SLOGI("exFAT Filesystem check completed OK.\n");
return 0;
case 1:
SLOGI("exFAT Filesystem check failed.\n");
return 0;
default:
SLOGE("exFAT Filesystem check failed (unknown exit code %d).\n", rc);
errno = EIO;
return -1;
}
} while (0);
return 0;
}
int ExFat::doMount(const char *fsPath, const char *mountPoint,
bool ro, bool remount, bool executable,
int ownerUid, int ownerGid, int permMask, bool createLost) {
int rc;
unsigned long flags;
char mountData[255];
const char *args[4];
flags = MS_NODEV | MS_NOSUID | MS_DIRSYNC;
flags |= (executable ? 0 : MS_NOEXEC);
flags |= (ro ? MS_RDONLY : 0);
flags |= (remount ? MS_REMOUNT : 0);
// Testing/security, mount ro up to now
flags |= MS_RDONLY;
sprintf(mountData,
"uid=%d,gid=%d,fmask=%o,dmask=%o",
ownerUid, ownerGid, permMask, permMask);
if (!remount) {
SLOGI("Trying to use exfat program to mount %s", fsPath);
args[0] = MOUNT_EXFAT_PATH;
args[1] = fsPath;
args[2] = mountPoint;
args[3] = NULL;
rc = logwrap(4, args, 1);
if (rc == 0) {
SLOGI("exfat executed successfully.");
} else {
SLOGE("Failed to execute exfat.");
}
} else {
rc = mount(fsPath, mountPoint, "fuseblk", flags, mountData);
}
return rc;
}
int ExFat::format(const char *fsPath, unsigned int numSectors) {
const char *args[3];
char strNumOfSectors[16] = {};
int rc;
args[0] = MKFS_EXFAT_PATH;
args[1] = fsPath;
args[2] = NULL;
rc = logwrap(3, args, 1);
if (rc == 0) {
SLOGI("Filesystem formatted OK");
return 0;
} else {
SLOGE("Format failed (unknown exit code %d)", rc);
errno = EIO;
return -1;
}
return 0;
}
3、修改 Volume.cpp
添加 #include "Ntfs.h"找到 Volume::mountVol() 函数
找到 else if (strcmp(fstype, "ntfs") == 0) 部分，在后面添加以下代码：
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if (Ntfs::check(devicePath)) {
errno = EIO;
/* Badness - abort the mount */
SLOGE("%s failed FS checks (%s)", devicePath, strerror(errno));
setState(Volume::State_Idle);
free(fstype);
return -1;
}
找到和 if (fstype != NULL) 对应的 else 块，在后面添加以下代码：
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//Check if the filesystem is exFAT
FILE *volf = fopen(devicePath, "rb");
int bytesRead = 0;
if (volf) {
char fschar[5];
//Read the signature in the PBR
fseek(volf, 3, SEEK_SET);
bytesRead = fread(fschar, 1, 5, volf);
fclose(volf);
if (bytesRead == 5 && strcmp(fschar, "EXFAT") == 0) {
if (ExFat::check(devicePath)) {
errno = EIO;
/* Badness - abort the mount */
SLOGE("%s failed FS checks (%s)", devicePath, strerror(errno));
setState(Volume::State_Idle);
free(fstype);
return -1;
}
if (ExFat::doMount(devicePath, "/mnt/secure/staging", false, false, false,
AID_SYSTEM, gid, 0702, true)) {
SLOGE("%s failed to mount via exFAT (%s)\n", devicePath, strerror(errno));
continue;
} else {
goto mountSuccess;
}
}
}
然后转到 if (fstype != NULL) 的 else 的末尾，在语句块之后，SLOGI("Device %s, target %s mounted @ /mnt/secure/staging", devicePath, getMountpoint()); 之前添加 mountSuccess: 跳转标签。
4、修改 vold 的 Android.mk
天际 common_src_files += ExFat.c五、修改 build/target/product/base.mk
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PRODUCT_PACKAGES += \
libfuse \
ntfs-3g \
exfat \
mkntfs \
ntfsfix \
mkexfatfs \
exfatfsck
六、编译
如果不出意外的话，编译之后就可以直接使用了。
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