android文件系统挂载分析(1)---正常开机挂载

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"android"系列分为三部分：

1.正常开机挂载

2.encryption

3.dm-verity

 

　　我们知道android有很多分区，如"system","userdata","cache"，他们是何时挂载的？如何挂载的？这个系列的文章进行分析。这里介绍第一部分，android手机正常开机各分区的挂载。这里我们以mtk平台进行分析，高通与mtk差别不是很大。

 

　　我们知道kernel起来以后执行的第一个文件是init进程，init进程会根据init.rc的规则启动进程或者服务。init.rc通过"import /init.${ro.hardware}.rc"语句导入平台的规则。

device/mediatek/mt6797/init.mt6797.rc

on fs
write /proc/bootprof "INIT:Mount_START"
mount_all /fstab.mt6797
chown system system /mobile_info
chmod 0771 /mobile_info
exec /system/bin/tune2fs -O has_journal -u 10010 -r 4096 /dev/block/platform/mtk-msdc.0/11230000.msdc0/by-name/userdata
write /proc/bootprof "INIT:Mount_END"

mount_all是一条命令，/fstab.mt6797是传入的参数

system/core/init/keywords.h

.....
KEYWORD(mount_all,   COMMAND, 1, do_mount_all)
.....

从上面我们可以看出，mount_all命令对应的是do_mount_all函数，/fstab.mt6797是do_mount_all函数的传入参数

system/core/init/builtins.cpp

int do_mount_all(int nargs, char **args)
{
pid_t pid;
int ret = -1;
int child_ret = -1;
int status;
struct fstab *fstab;

if (nargs != 2) {
return -1;
}

/*
* Call fs_mgr_mount_all() to mount all filesystems.  We fork(2) and         //使用fs_mgr_mount_all()函数去挂载所有的文件系统，我们使用fork()函数分配一个新的进程，在子进程中做挂载的事情,这样即使挂载出现问题，也能保护init主进程。
* do the call in the child to provide protection to the main init
* process if anything goes wrong (crash or memory leak), and wait for
* the child to finish in the parent.
*/
pid = fork();
if (pid > 0) {                   //父进程，等待子进程（pid=0）返回
/* Parent.  Wait for the child to return */
int wp_ret = TEMP_FAILURE_RETRY(waitpid(pid, &status, 0));
if (wp_ret < 0) {
/* Unexpected error code. We will continue anyway. */
NOTICE("waitpid failed rc=%d: %s\n", wp_ret, strerror(errno));
}

if (WIFEXITED(status)) {
ret = WEXITSTATUS(status);
} else {
ret = -1;
}
} else if (pid == 0) {     //子进程
/* child, call fs_mgr_mount_all() */
klog_set_level(6);  /* So we can see what fs_mgr_mount_all() does */    //修改kernel log的等级，让我们可以看到fs_mgr_mount_all函数的log
fstab = fs_mgr_read_fstab(args[1]);      //args[1]是传入的参数/fstab.mt6797,是一个文件。      加载分区挂载文件的内容到fstab结构体中。
child_ret = fs_mgr_mount_all(fstab);     //挂载分区*******************
fs_mgr_free_fstab(fstab);
if (child_ret == -1) {
ERROR("fs_mgr_mount_all returned an error\n");
}
_exit(child_ret);
} else {
/* fork failed, return an error */
return -1;
}

if (ret == FS_MGR_MNTALL_DEV_NEEDS_ENCRYPTION) {
property_set("vold.decrypt", "trigger_encryption");
} else if (ret == FS_MGR_MNTALL_DEV_MIGHT_BE_ENCRYPTED) {
property_set("ro.crypto.state", "encrypted");
property_set("ro.crypto.type", "block");
property_set("vold.decrypt", "trigger_default_encryption");
} else if (ret == FS_MGR_MNTALL_DEV_NOT_ENCRYPTED) {
property_set("ro.crypto.state", "unencrypted");
/* If fs_mgr determined this is an unencrypted device, then trigger
* that action.
*/
action_for_each_trigger("nonencrypted", action_add_queue_tail);
} else if (ret == FS_MGR_MNTALL_DEV_NEEDS_RECOVERY) {
/* Setup a wipe via recovery, and reboot into recovery */
ERROR("fs_mgr_mount_all suggested recovery, so wiping data via recovery.\n");
ret = wipe_data_via_recovery();
/* If reboot worked, there is no return. */
} else if (ret == FS_MGR_MNTALL_DEV_DEFAULT_FILE_ENCRYPTED) {
if (e4crypt_install_keyring()) {
return -1;
}
property_set("ro.crypto.state", "encrypted");
property_set("ro.crypto.type", "file");

// Although encrypted, we have device key, so we do not need to
// do anything different from the nonencrypted case.
action_for_each_trigger("nonencrypted", action_add_queue_tail);
} else if (ret == FS_MGR_MNTALL_DEV_NON_DEFAULT_FILE_ENCRYPTED) {
if (e4crypt_install_keyring()) {
return -1;
}
property_set("ro.crypto.state", "encrypted");
property_set("ro.crypto.type", "file");
property_set("vold.decrypt", "trigger_restart_min_framework");
} else if (ret > 0) {
ERROR("fs_mgr_mount_all returned unexpected error %d\n", ret);
}
/* else ... < 0: error */

return ret;
}

 

fork（）函数通过系统调用创建一个与原来进程几乎完全相同的进程，也就是两个进程可以做完全相同的事，但如果初始参数或者传入的变量不同，两个进程也可以做不同的事。返回值小于0为error，返回值等于0为子进程，返回值大于0为父进程。

 

args[1]是传入的参数/fstab.mt6797,是一个文件，生成的位置在/out/target/product/xxx/root/fstab.mt6797,生成这个文件的源文件位于vendor/mediatek/proprietary/hardware/fstab/mt6797/，根据编译规则确定fstab.mt6797文件的内容。

在do_mount_all()函数中，比较重要的两个函数如下，我们分析一下这两个函数

stab = fs_mgr_read_fstab(args[1]); 

child_ret = fs_mgr_mount_all(fstab);

 

首先我们看下fstab结构体和fstab.mt6797文件，fstab结构提要存储fstab.mt6797文件中的挂载信息，

 

struct fstab {
int num_entries;
struct fstab_rec *recs;
char *fstab_filename;
};

struct fstab_rec {
char *blk_device;
char *mount_point;
char *fs_type;
unsigned long flags;
char *fs_options;
int fs_mgr_flags;
char *key_loc;
char *verity_loc;
long long length;
char *label;
int partnum;
int swap_prio;
unsigned int zram_size;
};

 

out/target/product/xxx/root/fstab.mt6797
# 1 "vendor/mediatek/proprietary/hardware/fstab/mt6797/fstab.in"
# 1 "<built-in>"
# 1 "<命令行>"
# 1 "vendor/mediatek/proprietary/hardware/fstab/mt6797/fstab.in"
# 20 "vendor/mediatek/proprietary/hardware/fstab/mt6797/fstab.in"
/dev/block/platform/mtk-msdc.0/11230000.msdc0/by-name/system /system ext4 ro wait,verify

/dev/block/platform/mtk-msdc.0/11230000.msdc0/by-name/userdata /data ext4 noatime,nosuid,nodev,noauto_da_alloc,discard wait,check,resize,forceencrypt=/dev/block/platform/mtk-msdc.0/11230000.msdc0/by-name/metadata,
/dev/block/platform/mtk-msdc.0/11230000.msdc0/by-name/cache /cache ext4 noatime,nosuid,nodev,noauto_da_alloc,discard wait,check
/dev/block/platform/mtk-msdc.0/11230000.msdc0/by-name/protect1 /protect_f ext4 noatime,nosuid,nodev,noauto_da_alloc,commit=1,nodelalloc wait,check,formattable
/dev/block/platform/mtk-msdc.0/11230000.msdc0/by-name/protect2 /protect_s ext4 noatime,nosuid,nodev,noauto_da_alloc,commit=1,nodelalloc wait,check,formattable
/dev/block/platform/mtk-msdc.0/11230000.msdc0/by-name/nvdata /nvdata ext4 noatime,nosuid,nodev,noauto_da_alloc,discard wait,check,formattable
/dev/block/platform/mtk-msdc.0/11230000.msdc0/by-name/nvcfg /nvcfg ext4 noatime,nosuid,nodev,noauto_da_alloc,commit=1,nodelalloc wait,check,formattable
/dev/block/platform/mtk-msdc.0/11230000.msdc0/by-name/mobile_info /mobile_info ext4 noatime,nosuid,nodev,noauto_da_alloc,discard wait,check
# 39 "vendor/mediatek/proprietary/hardware/fstab/mt6797/fstab.in"
/devices/mtk-msdc.0/11230000.msdc0* auto vfat defaults voldmanaged=sdcard0:auto
/devices/mtk-msdc.0/11240000.msdc1* auto auto defaults voldmanaged=sdcard1:auto,encryptable=userdata
/devices/soc/11270000.usb3_xhci* auto vfat defaults voldmanaged=usbotg:auto

.................

 

我们先分析fstab结构体存放的挂载信息，通过fs_mgr_read_fstab实现

system/core/fs_mgr_fstab.c

struct fstab *fs_mgr_read_fstab(const char *fstab_path)                //从上面可以知道fstab_path为/fstab.mt6797
{
FILE *fstab_file;
int cnt, entries;
ssize_t len;
size_t alloc_len = 0;
char *line = NULL;
const char *delim = " \t";
char *save_ptr, *p;
struct fstab *fstab = NULL;
struct fs_mgr_flag_values flag_vals;
#define FS_OPTIONS_LEN 1024
char tmp_fs_options[FS_OPTIONS_LEN];

fstab_file = fopen(fstab_path, "r");           //打开文件
if (!fstab_file) {
ERROR("Cannot open file %s\n", fstab_path);
return 0;
}

entries = 0;
while ((len = getline(&line, &alloc_len, fstab_file)) != -1) {   //一行一行的读取文件内容，line是指向存放该行字符的指针         第一次读取文件内容，填充fstab结构体的内容
/* if the last character is a newline, shorten the string by 1 byte */
if (line[len - 1] == '\n') {          //如果最后一行是新行，缩短一字节的字符串
line[len - 1] = '\0';
}
/* Skip any leading whitespace */
p = line;                  
while (isspace(*p)) {    
p++;
}
/* ignore comments or empty lines */    //忽略注释和空格开始的行
if (*p == '#' || *p == '\0')
continue;
entries++;   //有用信息的行数
}

if (!entries) {      
ERROR("No entries found in fstab\n");
goto err;
}

/* Allocate and init the fstab structure */
fstab = calloc(1, sizeof(struct fstab));        //给fstab结构体分配内存
fstab->num_entries = entries;        //fstab->num_entries  存放可用信息的总行数
fstab->fstab_filename = strdup(fstab_path);     // fstab->fstab_filename 存放"fstab.mt6797"名称
fstab->recs = calloc(fstab->num_entries, sizeof(struct fstab_rec));   //给fstab->recs结构体分配内存

fseek(fstab_file, 0, SEEK_SET);      

cnt = 0;
while ((len = getline(&line, &alloc_len, fstab_file)) != -1) {        //第一次读取文件内容，填充结构体fstab->recs的内容
/* if the last character is a newline, shorten the string by 1 byte */
if (line[len - 1] == '\n') {
line[len - 1] = '\0';
}

/* Skip any leading whitespace */
p = line;
while (isspace(*p)) {
p++;
}
/* ignore comments or empty lines */
if (*p == '#' || *p == '\0')
continue;

/* If a non-comment entry is greater than the size we allocated, give an
* error and quit.  This can happen in the unlikely case the file changes
* between the two reads.
*/
if (cnt >= entries) {
ERROR("Tried to process more entries than counted\n");
break;
}
　//下面以/dev/block/platform/mtk-msdc.0/11230000.msdc0/by-name/userdata /data ext4 noatime,nosuid,nodev,noauto_da_alloc,discard wait,check,resize,forceencrypt=/dev/block/platform/mtk-msdc.0/11230000.msdc0/by-name/metadata,为例
if (!(p = strtok_r(line, delim, &save_ptr))) {    //strtok_r字符串分割函数，line表示要分割的字符串，delim要分割的标志，p存放分割后的字符串
ERROR("Error parsing mount source\n");
goto err;
}
fstab->recs[cnt].blk_device = strdup(p);   //fstab->recs[cnt].blk_device  存放文件系统绝对路径 /dev/block/platform/mtk-msdc.0/11230000.msdc0/by-name/userdata

if (!(p = strtok_r(NULL, delim, &save_ptr))) {
ERROR("Error parsing mount_point\n");
goto err;
}
fstab->recs[cnt].mount_point = strdup(p);   //fstab->recs[cnt].mount_point  挂载点 /data

if (!(p = strtok_r(NULL, delim, &save_ptr))) {
ERROR("Error parsing fs_type\n");
goto err;
}
fstab->recs[cnt].fs_type = strdup(p);    //fstab->recs[cnt].fs_type  文件系统类型  ext4

if (!(p = strtok_r(NULL, delim, &save_ptr))) {   //此时的p存放的参数 noatime,nosuid,nodev,noauto_da_alloc,discard
ERROR("Error parsing mount_flags\n");
goto err;
}
tmp_fs_options[0] = '\0';
fstab->recs[cnt].flags = parse_flags(p, mount_flags, NULL,        //fstab->recs[cnt].flags 表示这行有无参数
tmp_fs_options, FS_OPTIONS_LEN);

/*
static struct flag_list mount_flags[] = {
    { "noatime",    MS_NOATIME },
    { "noexec",     MS_NOEXEC },
    { "nosuid",     MS_NOSUID },
    { "nodev",      MS_NODEV },
    { "nodiratime", MS_NODIRATIME },
    { "ro",         MS_RDONLY },
    { "rw",         0 },
    { "remount",    MS_REMOUNT },
    { "bind",       MS_BIND },
    { "rec",        MS_REC },
    { "unbindable", MS_UNBINDABLE },
    { "private",    MS_PRIVATE },
    { "slave",      MS_SLAVE },
    { "shared",     MS_SHARED },
    { "defaults",   0 },
    { 0,            0 },
};
*/

/* fs_options are optional */
if (tmp_fs_options[0]) {                   //是个flags list，读取noatime,nosuid,nodev,noauto_da_alloc,discard
fstab->recs[cnt].fs_options = strdup(tmp_fs_options);
} else {
fstab->recs[cnt].fs_options = NULL;
}

if (!(p = strtok_r(NULL, delim, &save_ptr))) {           //此时p存放剩下的参数wait,check,resize,forceencrypt=/dev/block/platform/mtk-msdc.0/11230000.msdc0/by-name/metadata
ERROR("Error parsing fs_mgr_options\n");
goto err;
}
fstab->recs[cnt].fs_mgr_flags = parse_flags(p, fs_mgr_flags,
&flag_vals, NULL, 0);

/*
static struct flag_list fs_mgr_flags[] = {
    { "wait",        MF_WAIT },
    { "check",       MF_CHECK },
    { "encryptable=",MF_CRYPT },
    { "forceencrypt=",MF_FORCECRYPT },
    { "fileencryption",MF_FILEENCRYPTION },
    { "nonremovable",MF_NONREMOVABLE },
    { "voldmanaged=",MF_VOLDMANAGED},
    { "length=",     MF_LENGTH },
    { "recoveryonly",MF_RECOVERYONLY },
    { "swapprio=",   MF_SWAPPRIO },
    { "zramsize=",   MF_ZRAMSIZE },
    { "verify",      MF_VERIFY },
    { "noemulatedsd", MF_NOEMULATEDSD },
    { "notrim",       MF_NOTRIM },
    { "formattable", MF_FORMATTABLE },
#ifdef MTK_FSTAB_FLAGS
    { "resize",      MF_RESIZE },
#endif
    { "defaults",    0 },
    { 0,             0 },
};

*/

fstab->recs[cnt].key_loc = flag_vals.key_loc;    //fstab->recs[cnt].key_loc 存放"="后的内容  这里是    "/dev/block/platform/mtk-msdc.0/11230000.msdc0/by-name/metadata"
fstab->recs[cnt].verity_loc = flag_vals.verity_loc;
fstab->recs[cnt].length = flag_vals.part_length;
fstab->recs[cnt].label = flag_vals.label;
fstab->recs[cnt].partnum = flag_vals.partnum;
fstab->recs[cnt].swap_prio = flag_vals.swap_prio;
fstab->recs[cnt].zram_size = flag_vals.zram_size;
cnt++;
}
fclose(fstab_file);
free(line);
return fstab;

err:
fclose(fstab_file);
free(line);
if (fstab)
fs_mgr_free_fstab(fstab);
return NULL;
}

 fstab.mt6797文件的内容已经读取到fstab结构提中，下面开始分析挂载函数fs_mgr_mount_all,传入的参数就是上面分析的fstab。

system/core/fs_mgr/fs_mgr.c

int fs_mgr_mount_all(struct fstab *fstab)
{
int i = 0;
int encryptable = FS_MGR_MNTALL_DEV_NOT_ENCRYPTED;            //这个变量涉及到encryption加密，后面的文章会详细介绍这块
int error_count = 0;
int mret = -1;
int mount_errno = 0;
int attempted_idx = -1;

if (!fstab) {                
return -1;
}

for (i = 0; i < fstab->num_entries; i++) {
/* Don't mount entries that are managed by vold */
if (fstab->recs[i].fs_mgr_flags & (MF_VOLDMANAGED | MF_RECOVERYONLY)) {
continue;
}

/* Skip swap and raw partition entries such as boot, recovery, etc */
if (!strcmp(fstab->recs[i].fs_type, "swap") ||
!strcmp(fstab->recs[i].fs_type, "emmc") ||
!strcmp(fstab->recs[i].fs_type, "mtd")) {
continue;
}

/* Translate LABEL= file system labels into block devices */
if (!strcmp(fstab->recs[i].fs_type, "ext2") ||
!strcmp(fstab->recs[i].fs_type, "ext3") ||
!strcmp(fstab->recs[i].fs_type, "ext4")) {
int tret = translate_ext_labels(&fstab->recs[i]);
if (tret < 0) {
ERROR("Could not translate label to block device\n");
continue;
}
}
ERROR("blk device name %s\n", fstab->recs[i].blk_device);
#if defined(MTK_UBIFS_SUPPORT) || defined (MTK_FTL_SUPPORT)                //这里支持UBIFS/FTL，这里没有使用
if (strcmp(fstab->recs[i].fs_type, "ubifs") == 0 && strncmp("ubi@", fstab->recs[i].blk_device, 4) == 0) {
char tmp[25];
int n = ubi_attach_mtd(fstab->recs[i].blk_device + 4);
if (n < 0) {
ERROR("ubi_attach_mtd fail device name %s\n", fstab->recs[i].blk_device+4);
return -1;
}

n = sprintf(tmp, "/dev/ubi%d_0", n);
free(fstab->recs[i].blk_device);
fstab->recs[i].blk_device = malloc(n+1);
sprintf(fstab->recs[i].blk_device, "%s", tmp);
ERROR("debug : ubifs blk_device %s", fstab->recs[i].blk_device);
} else if (!strcmp(fstab->recs[i].fs_type, "rawfs") || !strcmp(fstab->recs[i].fs_type, "yaffs2")) {
char tmp[25];
int n = mtd_name_to_number(fstab->recs[i].blk_device + 4);
if (n < 0) {
return -1;
}

n = sprintf(tmp, "/dev/block/mtdblock%d", n);
free(fstab->recs[i].blk_device);
fstab->recs[i].blk_device = malloc(n+1);
sprintf(fstab->recs[i].blk_device, "%s", tmp);
ERROR("debug : rawfs blk_device %s", fstab->recs[i].blk_device);
}
#ifdef MTK_FTL_SUPPORT
else if (!strcmp(fstab->recs[i].fs_type, "ext4") && strstr(fstab->recs[i].blk_device, "ftl")) {
char tmp[30];
int err = 0;
int n = -1;
int ubi_num = fstab->recs[i].blk_device[21] - '0';
ERROR("debug : mtk_ftl_blk %s ubi_num %d\n", fstab->recs[i].blk_device, ubi_num);
if(strstr(fstab->recs[i].mount_point, "system")){
n = ubi_attach_mtd("system");
}else if(strstr(fstab->recs[i].mount_point, "data")){
n = ubi_attach_mtd("userdata");
}else if(strstr(fstab->recs[i].mount_point, "cache")){
n = ubi_attach_mtd("cache");
}
if((n != ubi_num) && (n >= 0))
{
ERROR("ubi number: %d == %d\n", n, ubi_num);
ubi_num = n;
}
n = sprintf(tmp, "/dev/ubi%d_0", ubi_num);
if (fstab->recs[i].fs_mgr_flags & MF_WAIT) {
int ret = wait_for_file(tmp, WAIT_TIMEOUT);
ERROR("wait_for_file(%s) ret = %d, errno = %s\n", fstab->recs[i].blk_device, ret, strerror(errno));
}
err = ftl_attach_ubi(ubi_num);
if (err < 0) {
return -1;
}
}
#endif
#endif
if (fstab->recs[i].fs_mgr_flags & MF_WAIT) {          //当有"wait"关键字时，让系统sleep一会
wait_for_file(fstab->recs[i].blk_device, WAIT_TIMEOUT);
}

if ((fstab->recs[i].fs_mgr_flags & MF_VERIFY) && device_is_secure()) {        //这个if涉及到system的挂载问题，系统默认是把system挂载到dm-01上，用户不可以remount，使能这个if，用户可以remount，这块会在后面的文章详细介绍
int rc = fs_mgr_setup_verity(&fstab->recs[i]);
if (device_is_debuggable() && rc == FS_MGR_SETUP_VERITY_DISABLED) {
INFO("Verity disabled");
} else if (rc != FS_MGR_SETUP_VERITY_SUCCESS) {
ERROR("Could not set up verified partition, skipping!\n");
continue;
}
}                    
//正常开机mount主要从是下面的代码
int last_idx_inspected;
int top_idx = i;

mret = mount_with_alternatives(fstab, i, &last_idx_inspected, &attempted_idx, encryptable);     //函数挂载
i = last_idx_inspected;
mount_errno = errno;

/* Deal with encryptability. */
if (!mret) {
int status = handle_encryptable(fstab, &fstab->recs[attempted_idx]);   //处理加密

if (status == FS_MGR_MNTALL_FAIL) {
/* Fatal error - no point continuing */
return status;
}

if (status != FS_MGR_MNTALL_DEV_NOT_ENCRYPTED) {
if (encryptable != FS_MGR_MNTALL_DEV_NOT_ENCRYPTED) {
// Log and continue
ERROR("Only one encryptable/encrypted partition supported\n");
}
encryptable = status;
}

/* Success!  Go get the next one */
continue;
}

/* mount(2) returned an error, handle the encryptable/formattable case */
bool wiped = partition_wiped(fstab->recs[top_idx].blk_device);
if (mret && mount_errno != EBUSY && mount_errno != EACCES &&
fs_mgr_is_formattable(&fstab->recs[top_idx]) && wiped) {
/* top_idx and attempted_idx point at the same partition, but sometimes
* at two different lines in the fstab.  Use the top one for formatting
* as that is the preferred one.
*/
ERROR("%s(): %s is wiped and %s %s is formattable. Format it.\n", __func__,
fstab->recs[top_idx].blk_device, fstab->recs[top_idx].mount_point,
fstab->recs[top_idx].fs_type);
if (fs_mgr_is_encryptable(&fstab->recs[top_idx]) &&
strcmp(fstab->recs[top_idx].key_loc, KEY_IN_FOOTER)) {
int fd = open(fstab->recs[top_idx].key_loc, O_WRONLY, 0644);
if (fd >= 0) {
INFO("%s(): also wipe %s\n", __func__, fstab->recs[top_idx].key_loc);
wipe_block_device(fd, get_file_size(fd));
close(fd);
} else {
ERROR("%s(): %s wouldn't open (%s)\n", __func__,
fstab->recs[top_idx].key_loc, strerror(errno));
}
}
if (fs_mgr_do_format(&fstab->recs[top_idx]) == 0) {
/* Let's replay the mount actions. */
i = top_idx - 1;
continue;
}
}
if (mret && mount_errno != EBUSY && mount_errno != EACCES &&
fs_mgr_is_encryptable(&fstab->recs[attempted_idx])) {
if (wiped) {
ERROR("%s(): %s is wiped and %s %s is encryptable. Suggest recovery...\n", __func__,
fstab->recs[attempted_idx].blk_device, fstab->recs[attempted_idx].mount_point,
fstab->recs[attempted_idx].fs_type);
encryptable = FS_MGR_MNTALL_DEV_NEEDS_RECOVERY;
continue;
} else {
/* Need to mount a tmpfs at this mountpoint for now, and set
* properties that vold will query later for decrypting
*/
ERROR("%s(): possibly an encryptable blkdev %s for mount %s type %s )\n", __func__,
fstab->recs[attempted_idx].blk_device, fstab->recs[attempted_idx].mount_point,
fstab->recs[attempted_idx].fs_type);
if (fs_mgr_do_tmpfs_mount(fstab->recs[attempted_idx].mount_point) < 0) {
++error_count;
continue;
}
}
encryptable = FS_MGR_MNTALL_DEV_MIGHT_BE_ENCRYPTED;
} else {
ERROR("Failed to mount an un-encryptable or wiped partition on"
"%s at %s options: %s error: %s\n",
fstab->recs[attempted_idx].blk_device, fstab->recs[attempted_idx].mount_point,
fstab->recs[attempted_idx].fs_options, strerror(mount_errno));
++error_count;
continue;
}
}

if (error_count) {
return -1;
} else {
return encryptable;
}
}