Add f2fs support for private volumes.
When formatting volumes, pass along fsType string which can be "auto"
to let the volume select the best choice. For now, private volumes
assume that MMC devices (like SD cards) are best off using f2fs when
both kernel support and tools are present, otherwise fall back to
ext4. Use blkid when mounting to pick the right set of tools.
Move filesystem utility methods into namespaces and place in separate
directory to be more organized.
Bug: 20275581
Change-Id: Id5f82d8672dda2e9f68c35b075f28232b0b55ed4
diff --git a/fs/Vfat.cpp b/fs/Vfat.cpp
new file mode 100644
index 0000000..faff763
--- /dev/null
+++ b/fs/Vfat.cpp
@@ -0,0 +1,219 @@
+/*
+ * 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);
+
+ /*
+ * 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(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