2013년 7월 4일 목요일

How to support NTFS fs with External Storage.

안드로이드의 external storage(USB Mass Storage)에 NTFS 파일 시스템을 지원하기

android_4.2.2 (BUILD_ID=JDQ39E)

storage_list.xml에 item을 추가한다.
device/hardkernel/odroid/overlay/frameworks/base/core/res/res/xml/storage_list.xml

<storage android:mountPoint="/storage/usb1"

             android:storageDescription="@string/storage_usb"
             android:primary="false"
             android:removable="true" />

USB Mass Storage를 연결 하면 발생하는 노드를 vold.fstab에 추가 한다.
device/hardkernel/odroid/conf/vold.fstab

dev_mount usb /storage/usb1 auto /devices/platform/xxx

init.odroid.rc에 node를 만든다.
device/hardkernel/odroid/conf/init.odroid.rc

mkdir /storage/usb1 0000 system system

system/vold를 수정 한다.

$ svn diff
Index: Volume.cpp
===================================================================
--- Volume.cpp (revision 21)
+++ Volume.cpp (working copy)
@@ -44,6 +44,7 @@
 #include "VolumeManager.h"
 #include "ResponseCode.h"
 #include "Fat.h"
+#include "Ntfs.h"
 #include "Process.h"
 #include "cryptfs.h"

@@ -401,7 +402,13 @@
         if (Fat::check(devicePath)) {
             if (errno == ENODATA) {
                 SLOGW("%s does not contain a FAT filesystem\n", devicePath);
-                continue;
+ if (Ntfs::doMount(devicePath, getMountpoint(), false, false, false,
+ 1000, 1015, 0702, false)) {
+ SLOGE("%s failed to mount via NTFS (%s)\n", devicePath, strerror(errno));
+ } else {
+ SLOGE("NTFS mounted");
+                 continue;
+ }
             }
             errno = EIO;
             /* Badness - abort the mount */
Index: Android.mk
===================================================================
--- Android.mk (revision 21)
+++ Android.mk (working copy)
@@ -12,6 +12,7 @@
  Process.cpp \
  Ext4.cpp \
  Fat.cpp \
+ Ntfs.cpp \
  Loop.cpp \
  Devmapper.cpp \
  ResponseCode.cpp \



Ntfs.h


  1 /*
  2  * Copyright (C) 2008 The Android Open Source Project
  3  *
  4  * Licensed under the Apache License, Version 2.0 (the "License");
  5  * you may not use this file except in compliance with the License.
  6  * You may obtain a copy of the License at
  7  *
  8  *      http://www.apache.org/licenses/LICENSE-2.0
  9  *
 10  * Unless required by applicable law or agreed to in writing, software
 11  * distributed under the License is distributed on an "AS IS" BASIS,
 12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 13  * See the License for the specific language governing permissions and
 14  * limitations under the License.
 15  */
 16
 17 #ifndef _NTFS_H
 18 #define _NTFS_H
 19
 20 #include <unistd.h>
 21
 22 class Ntfs {
 23 public:
 24     static int doMount(const char *fsPath, const char *mountPoint,
 25                        bool ro, bool remount, bool executable,
 26                        int ownerUid, int ownerGid, int permMask,
 27                        bool createLost);
 28 };
 29
 30 #endif


Ntfs.cpp


  1 /*
  2  * Copyright (C) 2008 The Android Open Source Project
  3  *
  4  * Licensed under the Apache License, Version 2.0 (the "License");
  5  * you may not use this file except in compliance with the License.
  6  * You may obtain a copy of the License at
  7  *
  8  *      http://www.apache.org/licenses/LICENSE-2.0
  9  *
 10  * Unless required by applicable law or agreed to in writing, software
 11  * distributed under the License is distributed on an "AS IS" BASIS,
 12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 13  * See the License for the specific language governing permissions and
 14  * limitations under the License.
 15  */
 16
 17 #include <stdio.h>
 18 #include <fcntl.h>
 19 #include <unistd.h>
 20 #include <errno.h>
 21 #include <string.h>
 22 #include <dirent.h>
 23 #include <errno.h>
 24 #include <fcntl.h>
 25
 26 #include <sys/types.h>
 27 #include <sys/stat.h>
 28 #include <sys/types.h>
 29 #include <sys/mman.h>
 30 #include <sys/mount.h>
 31
 32 #include <linux/kdev_t.h>
 33
 34 #define LOG_TAG "Vold"
 35
 36 #include <cutils/log.h>
 37 #include <cutils/properties.h>
 38
 39 #include "Ntfs.h"
 40
 41 static char FSCK_MSDOS_PATH[] = "/system/bin/fsck_msdos";
 42 static char MKDOSFS_PATH[] = "/system/bin/newfs_msdos";
 43 extern "C" int logwrap(int argc, const char **argv, int background);
 44 extern "C" int mount(const char *, const char *, const char *, unsigned long, const void *);
 45
 46 int Ntfs::doMount(const char *fsPath, const char *mountPoint,
 47                  bool ro, bool remount, bool executable,
 48                  int ownerUid, int ownerGid, int permMask, bool createLost) {
 49     int rc;
 50     unsigned long flags;
 51     char mountData[255];
 52
 53     flags = MS_NODEV | MS_NOSUID | MS_DIRSYNC;
54 
 55     flags |= (executable ? 0 : MS_NOEXEC);
 56     flags |= (ro ? MS_RDONLY : 0);
 57     flags |= (remount ? MS_REMOUNT : 0);
 58 
 59     /*
 60      * Note: This is a temporary hack. If the sampling profiler is enabled,
 61      * we make the SD card world-writable so any process can write snapshots.
 62      *
 63      * TODO: Remove this code once we have a drop box in system_server.
 64      */
 65     char value[PROPERTY_VALUE_MAX];
 66     property_get("persist.sampling_profiler", value, "");
 67     if (value[0] == '1') {
 68         SLOGW("The SD card is world-writable because the"
 69             " 'persist.sampling_profiler' system property is set to '1'.");
 70         permMask = 0;
 71     }
 72 
 73     sprintf(mountData,
 74             "utf8,uid=%d,gid=%d,fmask=%o,dmask=%o",
 75             ownerUid, ownerGid, permMask, permMask);
 76 
 77     rc = mount(fsPath, mountPoint, "ntfs", flags, mountData);
 78 
 79     if (rc && errno == EROFS) {
 80         SLOGE("%s appears to be a read only filesystem - retrying mount RO", fsPath);
 81         flags |= MS_RDONLY;
 82         rc = mount(fsPath, mountPoint, "ntfs", flags, mountData);
 83     }
 84 
 85     if (rc == 0 && createLost) {
 86         char *lost_path;
 87         asprintf(&lost_path, "%s/LOST.DIR", mountPoint);
 88         if (access(lost_path, F_OK)) {
 89             /*
 90              * Create a LOST.DIR in the root so we have somewhere to put
 91              * lost cluster chains (fsck_msdos doesn't currently do this)
 92              */
 93             if (mkdir(lost_path, 0755)) {
 94                 SLOGE("Unable to create LOST.DIR (%s)", strerror(errno));
 95             }
 96         }
 97         free(lost_path);
 98     }
 99 
100     return rc;
101 }


Ntfs는 read-only만 지원 됩니다.

shell@android:/ $ mount
rootfs / rootfs ro,relatime 0 0
tmpfs /dev tmpfs rw,nosuid,relatime,mode=755 0 0
devpts /dev/pts devpts rw,relatime,mode=600 0 0
proc /proc proc rw,relatime 0 0
sysfs /sys sysfs rw,relatime 0 0
none /acct cgroup rw,relatime,cpuacct 0 0
tmpfs /mnt/secure tmpfs rw,relatime,mode=700 0 0
tmpfs /mnt/asec tmpfs rw,relatime,mode=755,gid=1000 0 0
tmpfs /mnt/obb tmpfs rw,relatime,mode=755,gid=1000 0 0
none /dev/cpuctl cgroup rw,relatime,cpu 0 0
/dev/block/mmcblk0p2 /system ext4 ro,relatime,data=ordered 0 0
/dev/block/mmcblk0p4 /cache ext4 rw,nosuid,nodev,noatime,nomblk_io_submit,errors=panic,data=ordered 0 0
/dev/block/mmcblk0p3 /data ext4 rw,nosuid,nodev,noatime,nomblk_io_submit,discard,noauto_da_alloc,errors=panic,data=ordered 0 0
/sys/kernel/debug /sys/kernel/debug debugfs rw,relatime 0 0
/dev/block/vold/179:1 /mnt/sdcard vfat rw,dirsync,nosuid,nodev,noexec,relatime,uid=1000,gid=1015,fmask=0702,dmask=0702,allow_utime=0020,codepage=cp437,iocharset=iso8859-1,shortname=mixed,utf8,errors=remount-ro 00
/dev/block/vold/179:1 /mnt/secure/asec vfat rw,dirsync,nosuid,nodev,noexec,relatime,uid=1000,gid=1015,fmask=0702,dmask=0702,allow_utime=0020,codepage=cp437,iocharset=iso8859-1,shortname=mixed,utf8,errors=remount0
tmpfs /mnt/sdcard/.android_secure tmpfs ro,relatime,size=0k,mode=000 0 0
/dev/block/vold/179:9 /mnt/ext_sd vfat rw,dirsync,nosuid,nodev,noexec,relatime,uid=1000,gid=1015,fmask=0702,dmask=0702,allow_utime=0020,codepage=cp437,iocharset=iso8859-1,shortname=mixed,utf8,errors=remount-ro 00
/dev/block/vold/8:1 /storage/usb1 ntfs ro,dirsync,nosuid,nodev,noexec,relatime,uid=1000,gid=1015,umask=0702,nls=utf8,errors=continue,mft_zone_multiplier=1 0 0
shell@android:/ $ 






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