/*
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* Copyright (C) 2015 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 <unistd.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <fcntl.h>
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#include <sys/wait.h>
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#include <errno.h>
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#include <cutils/partition_utils.h>
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#include <sys/mount.h>
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#include <linux/magic.h>
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#include <android-base/unique_fd.h>
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#include <ext4_utils/ext4.h>
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#include <ext4_utils/ext4_utils.h>
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#include <logwrap/logwrap.h>
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#include <selinux/android.h>
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#include <selinux/label.h>
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#include <selinux/selinux.h>
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#include "fs_mgr_priv.h"
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#include "cryptfs.h"
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#define F2FS_BLKSIZE 4096
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#define F2FS_SUPER_OFFSET 1024
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struct f2fs_super_block {
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__le32 magic; /* Magic Number */
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__le16 major_ver; /* Major Version */
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__le16 minor_ver; /* Minor Version */
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__le32 empty[6];
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__le32 checksum_offset; /* checksum offset inside super block */
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__le64 block_count; /* total # of user blocks */
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} __attribute__((packed));
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using android::base::unique_fd;
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// Realistically, this file should be part of the android::fs_mgr namespace;
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using namespace android::fs_mgr;
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static int get_dev_sz(const std::string& fs_blkdev, uint64_t* dev_sz) {
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unique_fd fd(TEMP_FAILURE_RETRY(open(fs_blkdev.c_str(), O_RDONLY | O_CLOEXEC)));
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if (fd < 0) {
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PERROR << "Cannot open block device";
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return -1;
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}
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if ((ioctl(fd, BLKGETSIZE64, dev_sz)) == -1) {
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PERROR << "Cannot get block device size";
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return -1;
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}
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return 0;
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}
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static int format_ext4(const std::string& fs_blkdev, const std::string& fs_mnt_point,
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bool crypt_footer) {
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uint64_t dev_sz;
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int rc = 0;
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rc = get_dev_sz(fs_blkdev, &dev_sz);
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if (rc) {
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return rc;
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}
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/* Format the partition using the calculated length */
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if (crypt_footer) {
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dev_sz -= CRYPT_FOOTER_OFFSET;
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}
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std::string size_str = std::to_string(dev_sz / 4096);
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const char* const mke2fs_args[] = {
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"/system/bin/mke2fs", "-t", "ext4", "-b", "4096", fs_blkdev.c_str(),
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size_str.c_str(), nullptr};
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rc = android_fork_execvp_ext(arraysize(mke2fs_args), const_cast<char**>(mke2fs_args), NULL,
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true, LOG_KLOG, true, nullptr, nullptr, 0);
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if (rc) {
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LERROR << "mke2fs returned " << rc;
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return rc;
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}
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const char* const e2fsdroid_args[] = {
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"/system/bin/e2fsdroid", "-e", "-a", fs_mnt_point.c_str(), fs_blkdev.c_str(), nullptr};
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rc = android_fork_execvp_ext(arraysize(e2fsdroid_args), const_cast<char**>(e2fsdroid_args),
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NULL, true, LOG_KLOG, true, nullptr, nullptr, 0);
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if (rc) {
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LERROR << "e2fsdroid returned " << rc;
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}
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return rc;
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}
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static int format_f2fs(const std::string& fs_blkdev, uint64_t dev_sz, bool crypt_footer) {
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if (!dev_sz) {
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int rc = get_dev_sz(fs_blkdev, &dev_sz);
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if (rc) {
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return rc;
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}
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}
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/* Format the partition using the calculated length */
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if (crypt_footer) {
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dev_sz -= CRYPT_FOOTER_OFFSET;
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}
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std::string size_str = std::to_string(dev_sz / 4096);
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// clang-format off
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const char* const args[] = {
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"/system/bin/make_f2fs",
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"-g", "android",
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fs_blkdev.c_str(),
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size_str.c_str(),
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nullptr
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};
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// clang-format on
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return android_fork_execvp_ext(arraysize(args), const_cast<char**>(args), NULL, true,
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LOG_KLOG, true, nullptr, nullptr, 0);
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}
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int fs_mgr_do_format(const FstabEntry& entry, bool crypt_footer) {
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LERROR << __FUNCTION__ << ": Format " << entry.blk_device << " as '" << entry.fs_type << "'";
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if (entry.fs_type == "f2fs") {
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return format_f2fs(entry.blk_device, entry.length, crypt_footer);
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} else if (entry.fs_type == "ext4") {
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return format_ext4(entry.blk_device, entry.mount_point, crypt_footer);
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} else {
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LERROR << "File system type '" << entry.fs_type << "' is not supported";
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return -EINVAL;
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}
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}
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static bool read_f2fs_sb(const std::string& blk_device, struct f2fs_super_block *sb) {
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unique_fd fd(TEMP_FAILURE_RETRY(open(blk_device.c_str(), O_RDONLY | O_CLOEXEC)));
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if (TEMP_FAILURE_RETRY(pread(fd, sb, sizeof(*sb), F2FS_SUPER_OFFSET)) != sizeof(*sb)) {
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return false;
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}
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if (sb->magic == cpu_to_le32(F2FS_SUPER_MAGIC)) return true;
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if (TEMP_FAILURE_RETRY(pread(fd, sb, sizeof(*sb), F2FS_BLKSIZE + F2FS_SUPER_OFFSET)) != sizeof(*sb)) {
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return false;
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}
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return sb->magic == cpu_to_le32(F2FS_SUPER_MAGIC);
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}
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static uint64_t get_f2fs_size(const std::string& blk_device) {
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struct f2fs_super_block sb;
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if (read_f2fs_sb(blk_device, &sb)) {
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return sb.block_count * F2FS_BLKSIZE;
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}
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return 0;
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}
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static int resize_f2fs(const std::string& fs_blkdev, uint64_t dev_sz, bool crypt_footer) {
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if (!dev_sz) {
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int rc = get_dev_sz(fs_blkdev, &dev_sz);
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if (rc) {
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return rc;
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}
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}
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/* Format the partition using the calculated length */
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if (crypt_footer) {
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dev_sz -= CRYPT_FOOTER_OFFSET;
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}
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LINFO << "dev_sz: " << dev_sz;
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uint64_t f2fs_sz = get_f2fs_size(fs_blkdev);
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LINFO << "f2fs_sz: " << f2fs_sz;
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if (f2fs_sz <= 0 || dev_sz <= f2fs_sz + 4096 * 1024) {
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LINFO << "no need resize";
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return 0;
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}
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std::string size_str = std::to_string(dev_sz / 512);
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// clang-format off
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const char* const args[] = {
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"/system/bin/resize.f2fs",
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"-t",
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size_str.c_str(),
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fs_blkdev.c_str(),
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nullptr
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};
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// clang-format on
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return android_fork_execvp_ext(arraysize(args), const_cast<char**>(args), NULL, true,
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LOG_KLOG, true, nullptr, nullptr, 0);
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}
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int fs_mgr_do_resize(const FstabEntry& entry, bool crypt_footer) {
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LERROR << __FUNCTION__ << ": Reszie " << entry.blk_device << " as '" << entry.length << "'";
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if (entry.fs_type == "f2fs") {
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return resize_f2fs(entry.blk_device, entry.length, crypt_footer);
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//} else if (entry.fs_type == "ext4") {
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// return resize_ext4(entry.blk_device, entry.mount_point, crypt_footer);
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} else {
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LERROR << "File system type '" << entry.fs_type << "' is not supported";
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return -EINVAL;
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}
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}
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