blob: 7bd05ec65fa179c0b6b3fa3d37a4ab9ea836bce3 [file] [log] [blame]
/*
* 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 <base/logging.h>
#include <base/stringprintf.h>
#include <cutils/log.h>
#include <cutils/properties.h>
#include <selinux/selinux.h>
#include <logwrap/logwrap.h>
#include "Vfat.h"
#include "Utils.h"
#include "VoldUtil.h"
using android::base::StringPrintf;
namespace android {
namespace vold {
namespace vfat {
static const char* kMkfsPath = "/system/bin/newfs_msdos";
static const char* kFsckPath = "/system/bin/fsck_msdos";
bool IsSupported() {
return access(kMkfsPath, X_OK) == 0
&& access(kFsckPath, X_OK) == 0
&& IsFilesystemSupported("vfat");
}
status_t Check(const std::string& source) {
if (access(kFsckPath, X_OK)) {
SLOGW("Skipping fs checks\n");
return 0;
}
int pass = 1;
int rc = 0;
do {
std::vector<std::string> cmd;
cmd.push_back(kFsckPath);
cmd.push_back("-p");
cmd.push_back("-f");
cmd.push_back(source);
// Fat devices are currently always untrusted
rc = ForkExecvp(cmd, sFsckUntrustedContext);
if (rc < 0) {
SLOGE("Filesystem check failed due to logwrap error");
errno = EIO;
return -1;
}
switch(rc) {
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)", rc);
errno = EIO;
return -1;
}
} while (0);
return 0;
}
status_t Mount(const std::string& source, const std::string& target, bool ro,
bool remount, bool executable, int ownerUid, int ownerGid, int permMask,
bool createLost) {
int rc;
unsigned long flags;
char mountData[255];
const char* c_source = source.c_str();
const char* c_target = target.c_str();
flags = MS_NODEV | MS_NOSUID | MS_DIRSYNC;
flags |= (executable ? 0 : MS_NOEXEC);
flags |= (ro ? MS_RDONLY : 0);
flags |= (remount ? MS_REMOUNT : 0);
sprintf(mountData,
"utf8,uid=%d,gid=%d,fmask=%o,dmask=%o,shortname=mixed",
ownerUid, ownerGid, permMask, permMask);
rc = mount(c_source, c_target, "vfat", flags, mountData);
if (rc && errno == EROFS) {
SLOGE("%s appears to be a read only filesystem - retrying mount RO", c_source);
flags |= MS_RDONLY;
rc = mount(c_source, c_target, "vfat", flags, mountData);
}
if (rc == 0 && createLost) {
char *lost_path;
asprintf(&lost_path, "%s/LOST.DIR", c_target);
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;
}
status_t Format(const std::string& source, unsigned int numSectors) {
std::vector<std::string> cmd;
cmd.push_back(kMkfsPath);
cmd.push_back("-F");
cmd.push_back("32");
cmd.push_back("-O");
cmd.push_back("android");
cmd.push_back("-c");
cmd.push_back("64");
cmd.push_back("-A");
if (numSectors) {
cmd.push_back("-s");
cmd.push_back(StringPrintf("%u", numSectors));
}
cmd.push_back(source);
int rc = ForkExecvp(cmd);
if (rc < 0) {
SLOGE("Filesystem format failed due to logwrap error");
errno = EIO;
return -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;
}
} // namespace vfat
} // namespace vold
} // namespace android