/*
* Copyright (C) 2008 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include <stdio.h>
#include <stdlib.h>
#include <fcntl.h>
#include <unistd.h>
#include <errno.h>
#include <string.h>
#include <dirent.h>
#include <errno.h>
#include <fcntl.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <sys/mman.h>
#include <sys/mount.h>
#include <sys/wait.h>
#include <linux/fs.h>
#include <sys/ioctl.h>
#include <linux/kdev_t.h>
#define LOG_TAG "Vold"
#include <cutils/log.h>
#include <cutils/properties.h>
#include <logwrap/logwrap.h>
#include "Fat.h"
#include "VoldUtil.h"
static char FSCK_MSDOS_PATH[] = "/system/bin/fsck_msdos";
static char MKDOSFS_PATH[] = "/system/bin/newfs_msdos";
extern "C" int mount(const char *, const char *, const char *, unsigned long, const void *);
int Fat::check(const char *fsPath) {
bool rw = true;
if (access(FSCK_MSDOS_PATH, X_OK)) {
SLOGW("Skipping fs checks\n");
return 0;
}
int pass = 1;
int rc = 0;
do {
const char *args[4];
int status;
args[0] = FSCK_MSDOS_PATH;
args[1] = "-p";
args[2] = "-f";
args[3] = fsPath;
rc = android_fork_execvp(ARRAY_SIZE(args), (char **)args, &status,
false, true);
if (rc != 0) {
SLOGE("Filesystem check failed due to logwrap error");
errno = EIO;
return -1;
}
if (!WIFEXITED(status)) {
SLOGE("Filesystem check did not exit properly");
errno = EIO;
return -1;
}
status = WEXITSTATUS(status);
switch(status) {
case 0:
SLOGI("Filesystem check completed OK");
return 0;
case 2:
SLOGE("Filesystem check failed (not a FAT filesystem)");
errno = ENODATA;
return -1;
case 4:
if (pass++ <= 3) {
SLOGW("Filesystem modified - rechecking (pass %d)",
pass);
continue;
}
SLOGE("Failing check after too many rechecks");
errno = EIO;
return -1;
default:
SLOGE("Filesystem check failed (unknown exit code %d)", status);
errno = EIO;
return -1;
}
} while (0);
return 0;
}
int Fat::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];
flags = MS_NODEV | MS_NOSUID | MS_DIRSYNC;
flags |= (executable ? 0 : MS_NOEXEC);
flags |= (ro ? MS_RDONLY : 0);
flags |= (remount ? MS_REMOUNT : 0);
/*
* 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,
"utf8,uid=%d,gid=%d,fmask=%o,dmask=%o,shortname=mixed",
ownerUid, ownerGid, permMask, permMask);
rc = mount(fsPath, mountPoint, "vfat", flags, mountData);
if (rc && errno == EROFS) {
SLOGE("%s appears to be a read only filesystem - retrying mount RO", fsPath);
flags |= MS_RDONLY;
rc = mount(fsPath, mountPoint, "vfat", flags, mountData);
}
if (rc == 0 && createLost) {
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 rc;
}
int Fat::format(const char *fsPath, unsigned int numSectors, bool wipe) {
int fd;
const char *args[10];
int rc;
int status;
if (wipe) {
Fat::wipe(fsPath, numSectors);
}
args[0] = MKDOSFS_PATH;
args[1] = "-F";
args[2] = "32";
args[3] = "-O";
args[4] = "android";
args[5] = "-c";
args[6] = "8";
if (numSectors) {
char tmp[32];
snprintf(tmp, sizeof(tmp), "%u", numSectors);
const char *size = tmp;
args[7] = "-s";
args[8] = size;
args[9] = fsPath;
rc = android_fork_execvp(ARRAY_SIZE(args), (char **)args, &status,
false, true);
} else {
args[7] = fsPath;
rc = android_fork_execvp(8, (char **)args, &status, false,
true);
}
if (rc != 0) {
SLOGE("Filesystem format failed due to logwrap error");
errno = EIO;
return -1;
}
if (!WIFEXITED(status)) {
SLOGE("Filesystem format did not exit properly");
errno = EIO;
return -1;
}
status = WEXITSTATUS(status);
if (status == 0) {
SLOGI("Filesystem formatted OK");
return 0;
} else {
SLOGE("Format failed (unknown exit code %d)", status);
errno = EIO;
return -1;
}
return 0;
}
void Fat::wipe(const char *fsPath, unsigned int numSectors) {
int fd;
unsigned long long range[2];
fd = open(fsPath, O_RDWR);
if (fd >= 0) {
if (numSectors == 0) {
numSectors = get_blkdev_size(fd);
}
if (numSectors == 0) {
SLOGE("Fat wipe failed to determine size of %s", fsPath);
close(fd);
return;
}
range[0] = 0;
range[1] = (unsigned long long)numSectors * 512;
if (ioctl(fd, BLKDISCARD, &range) < 0) {
SLOGE("Fat wipe failed to discard blocks on %s", fsPath);
} else {
SLOGI("Fat wipe %d sectors on %s succeeded", numSectors, fsPath);
}
close(fd);
} else {
SLOGE("Fat wipe failed to open device %s", fsPath);
}
}