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241 lines
6.4 KiB
241 lines
6.4 KiB
/*
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* Copyright (C) 2008 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <fcntl.h>
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#include <unistd.h>
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#include <errno.h>
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#include <string.h>
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#include <dirent.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <sys/types.h>
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#include <sys/mman.h>
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#include <sys/mount.h>
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#include <sys/wait.h>
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#include <linux/fs.h>
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#include <sys/ioctl.h>
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#include <linux/kdev_t.h>
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#define LOG_TAG "Vold"
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#include <base/logging.h>
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#include <base/stringprintf.h>
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#include <cutils/log.h>
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#include <cutils/properties.h>
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#include <selinux/selinux.h>
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#include <logwrap/logwrap.h>
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#include "Fat.h"
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#include "Utils.h"
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#include "VoldUtil.h"
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using android::base::StringPrintf;
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static const char* kMkfsPath = "/system/bin/newfs_msdos";
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static const char* kFsckPath = "/system/bin/fsck_msdos";
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int Fat::check(const char *fsPath) {
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if (access(kFsckPath, X_OK)) {
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SLOGW("Skipping fs checks\n");
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return 0;
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}
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int pass = 1;
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int rc = 0;
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do {
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std::vector<std::string> cmd;
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cmd.push_back(kFsckPath);
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cmd.push_back("-p");
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cmd.push_back("-f");
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cmd.push_back(fsPath);
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// Fat devices are currently always untrusted
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rc = android::vold::ForkExecvp(cmd, android::vold::sFsckUntrustedContext);
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if (rc < 0) {
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SLOGE("Filesystem check failed due to logwrap error");
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errno = EIO;
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return -1;
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}
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switch(rc) {
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case 0:
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SLOGI("Filesystem check completed OK");
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return 0;
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case 2:
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SLOGE("Filesystem check failed (not a FAT filesystem)");
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errno = ENODATA;
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return -1;
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case 4:
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if (pass++ <= 3) {
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SLOGW("Filesystem modified - rechecking (pass %d)",
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pass);
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continue;
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}
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SLOGE("Failing check after too many rechecks");
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errno = EIO;
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return -1;
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default:
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SLOGE("Filesystem check failed (unknown exit code %d)", rc);
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errno = EIO;
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return -1;
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}
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} while (0);
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return 0;
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}
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int Fat::doMount(const char *fsPath, const char *mountPoint,
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bool ro, bool remount, bool executable,
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int ownerUid, int ownerGid, int permMask, bool createLost) {
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int rc;
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unsigned long flags;
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char mountData[255];
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flags = MS_NODEV | MS_NOSUID | MS_DIRSYNC;
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flags |= (executable ? 0 : MS_NOEXEC);
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flags |= (ro ? MS_RDONLY : 0);
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flags |= (remount ? MS_REMOUNT : 0);
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/*
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* Note: This is a temporary hack. If the sampling profiler is enabled,
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* we make the SD card world-writable so any process can write snapshots.
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*
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* TODO: Remove this code once we have a drop box in system_server.
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*/
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char value[PROPERTY_VALUE_MAX];
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property_get("persist.sampling_profiler", value, "");
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if (value[0] == '1') {
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SLOGW("The SD card is world-writable because the"
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" 'persist.sampling_profiler' system property is set to '1'.");
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permMask = 0;
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}
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sprintf(mountData,
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"utf8,uid=%d,gid=%d,fmask=%o,dmask=%o,shortname=mixed",
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ownerUid, ownerGid, permMask, permMask);
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rc = mount(fsPath, mountPoint, "vfat", flags, mountData);
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if (rc && errno == EROFS) {
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SLOGE("%s appears to be a read only filesystem - retrying mount RO", fsPath);
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flags |= MS_RDONLY;
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rc = mount(fsPath, mountPoint, "vfat", flags, mountData);
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}
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if (rc == 0 && createLost) {
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char *lost_path;
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asprintf(&lost_path, "%s/LOST.DIR", mountPoint);
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if (access(lost_path, F_OK)) {
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/*
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* Create a LOST.DIR in the root so we have somewhere to put
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* lost cluster chains (fsck_msdos doesn't currently do this)
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*/
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if (mkdir(lost_path, 0755)) {
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SLOGE("Unable to create LOST.DIR (%s)", strerror(errno));
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}
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}
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free(lost_path);
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}
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return rc;
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}
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int Fat::format(const char *fsPath, unsigned int numSectors, bool wipe) {
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if (wipe) {
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Fat::wipe(fsPath, numSectors);
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}
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std::vector<std::string> cmd;
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cmd.push_back(kMkfsPath);
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cmd.push_back("-F");
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cmd.push_back("32");
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cmd.push_back("-O");
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cmd.push_back("android");
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cmd.push_back("-c");
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cmd.push_back("64");
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cmd.push_back("-A");
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if (numSectors) {
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cmd.push_back("-s");
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cmd.push_back(StringPrintf("%u", numSectors));
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}
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cmd.push_back(fsPath);
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int rc = android::vold::ForkExecvp(cmd);
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if (rc < 0) {
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SLOGE("Filesystem format failed due to logwrap error");
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errno = EIO;
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return -1;
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}
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if (rc == 0) {
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SLOGI("Filesystem formatted OK");
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return 0;
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} else {
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SLOGE("Format failed (unknown exit code %d)", rc);
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errno = EIO;
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return -1;
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}
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return 0;
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}
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void Fat::wipe(const char *fsPath, unsigned int numSectors) {
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unsigned long long range[2];
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int fd = open(fsPath, O_RDWR | O_CLOEXEC);
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if (fd == -1) {
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SLOGE("Fat wipe failed to open device %s", fsPath);
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return;
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}
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if (numSectors == 0) {
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unsigned long nr_sec;
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get_blkdev_size(fd, &nr_sec);
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if (nr_sec > UINT32_MAX) {
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SLOGE("Too many sectors for FAT: %ld", nr_sec);
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close(fd);
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return;
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}
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numSectors = nr_sec;
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}
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if (numSectors == 0) {
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SLOGE("Fat wipe failed to determine size of %s", fsPath);
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close(fd);
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return;
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}
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range[0] = 0;
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range[1] = (unsigned long long)numSectors * 512;
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if (ioctl(fd, BLKDISCARD, &range) < 0) {
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SLOGE("Fat wipe failed to discard blocks on %s", fsPath);
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} else {
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SLOGI("Fat wipe %d sectors on %s succeeded", numSectors, fsPath);
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}
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close(fd);
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}
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