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roots.c
1248 lines (1091 loc) · 42 KB
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roots.c
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/*
* Copyright (C) 2007 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 <errno.h>
#include <stdlib.h>
#include <sys/mount.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <unistd.h>
#include <ctype.h>
#include <dirent.h>
#include "mtdutils/mtdutils.h"
#include "mtdutils/mounts.h"
#include "roots.h"
#include "common.h"
#include "make_ext4fs.h"
#include <fs_mgr.h>
#include <libgen.h>
#include <fcntl.h> // open()
#include "flashutils/flashutils.h" // format_unknown_device() MTD / BML / MMC support
#include "bmlutils/bmlutils.h" // format_rfs_device()
#include "extendedcommands.h"
#include "advanced_functions.h"
#include "voldclient/voldclient.h"
#include "libcrecovery/common.h" // __popen / __pclose
static struct fstab *fstab = NULL;
extern struct selabel_handle *sehandle;
/*
system/core/fs_mgr/include/fs_mgr.h
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;
// cwm
char *blk_device2;
char *fs_type2;
char *fs_options2;
char *lun;
};
*******
system/core/fs_mgr/fs_mgr.c
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 },
{ "sync", MS_SYNCHRONOUS },
{ "defaults", 0 },
{ 0, 0 },
};
static struct flag_list fs_mgr_flags[] = {
{ "wait", MF_WAIT },
{ "check", MF_CHECK },
{ "encryptable=",MF_CRYPT },
{ "nonremovable",MF_NONREMOVABLE },
{ "voldmanaged=",MF_VOLDMANAGED},
{ "length=", MF_LENGTH },
{ "recoveryonly",MF_RECOVERYONLY },
{ "swapprio=", MF_SWAPPRIO },
{ "zramsize=", MF_ZRAMSIZE },
{ "verify", MF_VERIFY },
{ "noemulatedsd", MF_NOEMULATEDSD },
{ "defaults", 0 },
{ 0, 0 },
};
****
Support additional extra.fstab entries and add device2
* Needed until fs_mgr_read_fstab() starts to parse a blk_device2 entries
* extra.fstab sample:
----> start extra.fstab
# add here entries already existing in main device fstab, but for which you want a blk_device2, fs_type2 or fs_options2
# used to partition sdcard and format it to ext2/ext3
# used also to stat for size of mtd/yaffs2 partitions
# blk_device2 # mount_point fs_type2 fs_options2 flags (not used in extra.fstab code)
/dev/block/mmcblk0p28 /storage/sdcard0 auto defaults defaults
/dev/block/mmcblk1p1 /storage/sdcard1 auto defaults defaults
/dev/block/sda1 /storage/usbdisk0 auto defaults defaults
<---- end extra.fstab
* system/core/fs_mgr/fs_mgr.c/fs_mgr_read_fstab() will parse our recovery.fstab file:
- it will populate recovery fstab struct: fstab->recs[i].blk_device, fstab->recs[i].mount_point, fstab->recs[i].fs_type, fstab->recs[i].fs_options
- fs_options are defines by "static struct flag_list mount_flags[]"
- after that, it will call parse_flags() to parse the flags
- flags are defined in "static struct flag_list fs_mgr_flags[]"
- the flag voldmanaged=label:partnum is processed by parse_flags() in cm-10.2
+ label is always set to NULL in cm-10.2
+ in cm-11, label is used to define v->mount_point = fstab->recs[i].label as mount point is set to auto in fstab.device
+ partnum is the mmcblk/mtdblk real number for voldmanaged partition
+ exp for a device with dedicated internal sdcard partition:
voldmanaged=sdcard0:36: label is sdcard0, mount_point will be /storage/sdcard0 and partition is /dev/block/mmcblk0p36
in cm-10.2, what ever we set label, it doesn't matter as it is discarded by parse_flags() and we use the defined mount_point in fstab.device
- to null options, use "defaults" or a non defined entry in flag_list mount_flags[] like "default"
- to null flags, use "defaults" or a non defined entry in flag_list fs_mgr_flags[] like "default"
* once recovery fstab struct is populated by roots.c/load_volume_table(), we process extra.fstab by load_volume_table_extra()
* it will parse the extra.fstab by calling fs_mgr_read_fstab()
* this will populate fstab_extra->recs[i].blk_device, fstab_extra->recs[i].mount_point, fstab_extra->recs[i].fs_type, fstab_extra->recs[i].fs_options
* fstab_extra flags will not be used, so we set them to "defaults"
* after that, we call add_extra_fstab_entries():
- it will compare each fstab->recs[i].mount_point from main recovery.fstab to the fstab_extra->recs[i].mount_point from extra.fstab
- if same mount point is found in both files, blk_device2, fs_type2 and fs_options2 from fstab->recs[i] are set to
blk_device, fs_type and fs_options from fstab_extra->recs[i]
- so, mount_point in extra.fstab must be the same as in main fstab.device we're using to create recovery.fstab
- in cm11, since mount_point is auto, we should use same voldmanaged label in both extra.fstab and fstab.device like "voldmanaged=sdcard0:36"
this way, we can compare fstab->recs[i].label to fstab_extra->recs[i].label to assign blk_device2, fs_type2 and fs_options2
*/
static struct fstab *fstab_extra = NULL;
static void add_extra_fstab_entries(int index) {
if (!fstab_extra)
return;
int i;
Volume* vol = &fstab->recs[index];
for(i = 0; i < fstab_extra->num_entries; ++i) {
Volume* extraVol = &fstab_extra->recs[i];
if (strcmp(extraVol->mount_point, vol->mount_point) == 0) {
vol->blk_device2 = strdup(extraVol->blk_device);
vol->fs_type2 = strdup(extraVol->fs_type);
if (extraVol->fs_options != NULL)
vol->fs_options2 = strdup(extraVol->fs_options);
}
}
}
static void load_volume_table_extra() {
int i;
fs_mgr_free_fstab(fstab_extra);
fstab_extra = fs_mgr_read_fstab("/etc/extra.fstab");
if (!fstab_extra) {
printf("No /etc/extra.fstab\n");
return;
}
printf("\nextra filesystem table: (device2, fstype2, options2):\n");
printf( "======================\n");
for(i = 0; i < fstab_extra->num_entries; ++i) {
Volume* v = &fstab_extra->recs[i];
printf(" %d %s %s %s %lld\n", i, v->mount_point, v->fs_type,
v->blk_device, v->length);
}
printf("\n");
}
Volume* volume_for_path_extra(const char* path) {
return fs_mgr_get_entry_for_mount_point(fstab_extra, path);
}
//----- end extra.fstab support
static void write_fstab_entry(Volume *v, FILE *file)
{
if (v == NULL || file == NULL || strcmp(v->fs_type, "ramdisk") == 0)
return;
// detect MTD/EMMC devices by name. BML devices won't be auto detected and we need the proper blk device in recovery.fstab!
// mtdutils.c/cmd_bml_get_partition_device() always returns -1
char device[200];
if (strncmp(v->blk_device, "/", 1) != 0) {
if (get_partition_device(v->blk_device, device) != 0) {
printf(" invalid device: skipping /etc/fstab entry\n");
return;
}
} else {
strcpy(device, v->blk_device);
}
if (strcmp(v->fs_type, "emmc") != 0 &&
!fs_mgr_is_voldmanaged(v) &&
strncmp(device, "/", 1) == 0 &&
strncmp(v->mount_point, "/", 1) == 0) {
fprintf(file, "%s ", device);
fprintf(file, "%s ", v->mount_point);
// special case rfs cause auto will mount it as vfat on samsung.
// use real fstype if it is an f2fs/ext4 conversion
char* fstype = v->fs_type;
if (v->fs_type2 != NULL) {
if (strcmp(v->fs_type, "rfs") != 0 &&
!(strcmp(v->fs_type, "f2fs") == 0 && strcmp(v->fs_type2, "ext4") == 0) &&
!(strcmp(v->fs_type, "ext4") == 0 && strcmp(v->fs_type2, "f2fs") == 0))
fstype = "auto";
}
fprintf(file, "%s defaults\n", fstype);
}
}
int get_num_volumes() {
return fstab->num_entries;
}
Volume* get_device_volumes() {
return fstab->recs;
}
static int is_datamedia = 0;
int is_data_media()
{
return is_datamedia;
}
// is volume a physical primary storage ?
int is_volume_primary_storage(Volume* v)
{
if (v == NULL)
return 0;
// Static mount point /sdcard is primary storage, except when it's
// declared as datamedia
if (strcmp(v->mount_point, "/sdcard") == 0) {
if (strcmp(v->fs_type, "datamedia") == 0) {
return 0;
}
return 1;
}
// Static mount points beginning with /mnt/media_rw/sdcard are primary
// storage except when a non-zero digit follows (eg. sdcard[1-9])
if (strcmp(v->mount_point, "/mnt/media_rw/sdcard0") == 0 || strcmp(v->mount_point, "/mnt/media_rw/sdcard") == 0) {
return 1;
}
// Dynamic mount points which label begins with sdcard are primary storage
// except when a non-zero digit follows (eg. sdcard[1-9])
// load_volume_table() allows a custom moint point different from /storage/label
if (fs_mgr_is_voldmanaged(v)) {
if (strcmp(v->label, "sdcard0") == 0 || strcmp(v->label, "sdcard") == 0)
return 1;
}
return 0;
}
// check if the volume is used as secondary storage
// we also allow voldmanaged usb volumes
int is_volume_extra_storage(Volume* v) {
if (strcmp(v->mount_point, get_primary_storage_path()) == 0)
return 0;
if (strcmp(v->mount_point, "/external_sd") == 0 ||
strncmp(v->mount_point, "/mnt/media_rw/sdcard", 20) == 0) {
return 1;
}
// load_volume_table() allows a custom moint point different from /storage/label
if (fs_mgr_is_voldmanaged(v)) {
return 1;
}
return 0;
}
void load_volume_table()
{
int i;
int ret;
fs_mgr_free_fstab(fstab);
fstab = fs_mgr_read_fstab("/etc/recovery.fstab");
if (!fstab) {
printf("failed to read /etc/recovery.fstab\n");
return;
}
ret = fs_mgr_add_entry(fstab, "/tmp", "ramdisk", "ramdisk", 0);
if (ret < 0 ) {
printf("failed to add /tmp entry to fstab\n");
fs_mgr_free_fstab(fstab);
fstab = NULL;
return;
}
// load /etc/extra.fstab entries
load_volume_table_extra();
for (i = 0; i < fstab->num_entries; ++i) {
Volume* v = &fstab->recs[i];
// Process vold-managed volumes with mount point "auto"
// we also allow a custom moint point different from /storage/label
// https://source.android.com/devices/tech/storage/config-example.html
if (fs_mgr_is_voldmanaged(v) && strcmp(v->mount_point, "auto") == 0) {
char path[PATH_MAX];
snprintf(path, PATH_MAX, "/storage/%s", v->label);
free(v->mount_point);
v->mount_point = strdup(path);
}
// get blk_device2, fstype_2 and fs_options2 if they exist
add_extra_fstab_entries(i);
}
#ifdef USE_F2FS
// allow switching between f2fs/ext4 depending on actual real format
// if fstab entry matches the real device fs_type, do nothing
// also skip vold managed devices as vold relies on the defined flags.
// vold managed devices should be set to auto fstype for free formatting
printf("checking ext4 <-> f2fs conversion...\n");
for (i = 0; i < fstab->num_entries; ++i) {
Volume* v = &fstab->recs[i];
if (strcmp(v->fs_type, "ext4") == 0 || strcmp(v->fs_type, "f2fs") == 0) {
char* real_fstype = get_real_fstype(v->mount_point);
if (real_fstype == NULL || strcmp(real_fstype, v->fs_type) == 0 || fs_mgr_is_voldmanaged(v))
continue;
if (strcmp(real_fstype, "ext4") == 0 || strcmp(real_fstype, "f2fs") == 0) {
char *fstab_fstype;
char *fstab_options = NULL;
if (v->fs_type2 != NULL && v->fs_options2 != NULL && strcmp(real_fstype, v->fs_type2) == 0) {
// try to use existing fs_options2 if possible
fstab_fstype = strdup(v->fs_type);
free(v->fs_type);
v->fs_type = strdup(v->fs_type2);
free(v->fs_type2);
v->fs_type2 = strdup(fstab_fstype);
if (v->fs_options != NULL) {
fstab_options = strdup(v->fs_options);
free(v->fs_options);
}
v->fs_options = strdup(v->fs_options2);
free(v->fs_options2);
if (fstab_options != NULL) {
v->fs_options2 = strdup(fstab_options);
free(fstab_options);
}
} else {
// no fs_options2: drop to bare minimal default fs_options
fstab_fstype = strdup(v->fs_type);
free(v->fs_type);
v->fs_type = strdup(real_fstype);
if (v->fs_options != NULL)
free(v->fs_options);
if (strcmp(v->fs_type, "f2fs") == 0) {
v->fs_options = strdup("rw,noatime,nodev,nodiratime,inline_xattr");
} else {
// ext4: default options will be set in try_mount()
v->fs_options = NULL;
}
}
printf(" %s: %s -> %s\n", v->mount_point, fstab_fstype, v->fs_type);
free(fstab_fstype);
}
}
}
printf("\n");
#endif
// Create /etc/fstab so tools like Busybox mount work
FILE *file;
file = fopen("/etc/mtab", "a");
fclose(file);
file = fopen("/etc/fstab", "w");
if (file == NULL) {
LOGW("Unable to create /etc/fstab!\n");
}
is_datamedia = 1;
printf("recovery filesystem table\n");
printf("=========================\n");
for (i = 0; i < fstab->num_entries; ++i) {
Volume* v = &fstab->recs[i];
printf(" %d %s %s %s %lld\n", i, v->mount_point, v->fs_type,
v->blk_device, v->length);
if (v->blk_device2 != NULL) {
// print extra volume table
printf(" %s %s %s %lld\n", v->mount_point, v->fs_type2,
v->blk_device2, v->length);
}
if (is_volume_primary_storage(v)) {
is_datamedia = 0;
}
write_fstab_entry(v, file);
}
if (file != NULL)
fclose(file);
printf("\n");
}
Volume* volume_for_path(const char* path) {
return fs_mgr_get_entry_for_mount_point(fstab, path);
}
static char* primary_storage_path = NULL;
char* get_primary_storage_path() {
int i = 0;
if (primary_storage_path == NULL) {
primary_storage_path = "/sdcard";
for (i = 0; i < fstab->num_entries; ++i) {
Volume* v = &fstab->recs[i];
if (is_volume_primary_storage(v)) {
// one time malloc
primary_storage_path = strdup(v->mount_point);
break;
}
}
}
return primary_storage_path;
}
int is_primary_storage_voldmanaged() {
Volume* v = volume_for_path(get_primary_storage_path());
return fs_mgr_is_voldmanaged(v);
}
int get_num_extra_volumes() {
int num = 0;
int i;
for (i = 0; i < get_num_volumes(); ++i) {
Volume* v = get_device_volumes() + i;
if (is_volume_extra_storage(v)) {
if (fs_mgr_is_voldmanaged(v) && !vold_is_volume_available(v->mount_point))
continue;
num++;
}
}
return num;
}
char** get_extra_storage_paths() {
char** paths = NULL;
int num_extra_volumes = get_num_extra_volumes();
int i = 0, j = 0;
if (num_extra_volumes == 0)
return NULL;
paths = (char**)malloc((num_extra_volumes + 1) * sizeof(char*));
if (paths == NULL) {
LOGE("get_extra_storage_paths: memory error\n");
return NULL;
}
for (i = 0; i < get_num_volumes(); ++i) {
Volume* v = get_device_volumes() + i;
if (is_volume_extra_storage(v)) {
if (fs_mgr_is_voldmanaged(v) && !vold_is_volume_available(v->mount_point))
continue;
paths[j] = strdup(v->mount_point);
++j;
}
}
paths[j] = NULL;
return paths;
}
static char* android_secure_path = NULL;
char* get_android_secure_path() {
if (android_secure_path == NULL) {
android_secure_path = malloc(sizeof("/.android_secure") + strlen(get_primary_storage_path()) + 1);
sprintf(android_secure_path, "%s/.android_secure", primary_storage_path);
}
return android_secure_path;
}
int try_mount(const char* device, const char* mount_point, const char* fs_type, const char* fs_options) {
if (device == NULL || mount_point == NULL || fs_type == NULL)
return -1;
int ret = 0;
if (strcmp(fs_type, "auto") == 0) {
char mount_cmd[PATH_MAX];
sprintf(mount_cmd, "mount %s %s", device, mount_point);
ret = __system(mount_cmd);
} else if (fs_options == NULL) {
ret = mount(device, mount_point, fs_type,
MS_NOATIME | MS_NODEV | MS_NODIRATIME, "");
// LOGE("ret =%d - device=%s - mount_point=%s - fstype=%s\n", ret, device, mount_point, fs_type); // debug
} else {
char mount_cmd[PATH_MAX];
sprintf(mount_cmd, "mount -t %s -o%s %s %s", fs_type, fs_options, device, mount_point);
ret = __system(mount_cmd);
}
if (ret != 0)
LOGW("failed to mount %s %s %s (%s)\n", device, mount_point, fs_type, strerror(errno));
return ret;
}
/*
- Since Android 4.2, internal storage is located in /data/media/0 (multi user compatibility)
- When upgrading to android 4.2, /data/media content is "migrated" to /data/media/0
- In recovery, we force use of /data/media instead of /data/media/0 for internal storage if /data/media/.cwm_force_data_media file is found
- For devices with pre-4.2 android support, we can define BOARD_HAS_NO_MULTIUSER_SUPPORT flag to default to /data/media, unless /data/media/0 exists
- If we call check_migrated_storage() directly, we need to ensure_path_mounted("/data") before
- On recovery start, we first call load_volume_table() then setup_data_media(mount = true)
- setup_data_media(mount = true) will mount /data, call check_migrated_storage() then unmount /data
*/
#ifdef BOARD_HAS_NO_MULTIUSER_SUPPORT
static int is_migrated_storage = 0;
#else
static int is_migrated_storage = 1;
#endif
int use_migrated_storage() {
return is_migrated_storage;
}
static int check_migrated_storage() {
struct stat s;
#ifdef BOARD_HAS_NO_MULTIUSER_SUPPORT
is_migrated_storage = (lstat("/data/media/0", &s) == 0 &&
lstat("/data/media/.cwm_force_data_media", &s) != 0);
#else
is_migrated_storage = (lstat("/data/media/.cwm_force_data_media", &s) != 0);
#endif
return is_migrated_storage;
}
// load_volume_table() must have been called at this stage, so we can use ensure_path_mounted()
// data partition must be mounted if we pass in argument mount = 0
// setup_data_media() is either called by:
// - ensure_path_mounted() which will mount /data
// - on recovery start AFTER load_volume_table() AND with mount = true argument (setup_data_media(mount = true))
// - in show_advanced_menu() to toggle /data/media target
// - in show_partition_menu() and show_format_ext4_or_f2fs_menu() after format /data to recreate sdcard link
void setup_data_media(int mount) {
if (!is_data_media())
return;
if (mount) {
int count = 0;
int ret = -1;
while (count < 5 && ret != 0) {
usleep(500000); // wait before first trial to avoid busy device on recovery start
ret = ensure_path_mounted("/data");
++count;
}
if (ret != 0) {
LOGE("could not mount /data to setup /data/media path!\n");
return;
}
}
int i;
char* mount_point = "/sdcard";
for (i = 0; i < get_num_volumes(); ++i) {
Volume* vol = get_device_volumes() + i;
if (strcmp(vol->fs_type, "datamedia") == 0) {
mount_point = vol->mount_point;
break;
}
}
// recreate /data/media with proper permissions
rmdir(mount_point);
mkdir("/data/media", S_IRWXU | S_IRGRP | S_IXGRP | S_IROTH | S_IXOTH);
// support /data/media/0 (Android 4.2+)
char* path = "/data/media";
if (check_migrated_storage()) {
path = "/data/media/0";
mkdir(path, S_IRWXU | S_IRGRP | S_IXGRP | S_IROTH | S_IXOTH);
}
symlink(path, mount_point);
if (mount) {
int count = 0;
int ret = -1;
while (count < 5 && ret != 0) {
ret = ensure_path_unmounted("/data");
usleep(500000);
++count;
}
if (ret != 0)
LOGE("could not unmount /data after /data/media setup\n");
}
}
// handle /sdcard/ path when not defined in recovery.fstab
int is_data_media_volume_path(const char* path) {
if (!is_data_media())
return 0;
Volume* v = volume_for_path(path);
if (v != NULL)
return strcmp(v->fs_type, "datamedia") == 0;
if (strcmp(path, "/sdcard") == 0 || strncmp(path, "/sdcard/", 8) == 0)
return 1;
return 0;
}
// ensure_path_mounted_always_true will not try to mount a partition and always return true
// we need this in md5 thread as ensure_path_mounted_at_mount_point() is not thread friendly
static int ensure_path_mounted_always_true = 0;
void set_ensure_mount_always_true(int state) {
ensure_path_mounted_always_true = state;
}
int ensure_path_mounted(const char* path) {
if (ensure_path_mounted_always_true)
return 0;
return ensure_path_mounted_at_mount_point(path, NULL);
}
// not thread safe because of scan_mounted_volumes()
int ensure_path_mounted_at_mount_point(const char* path, const char* mount_point) {
if (is_data_media_volume_path(path)) {
int ret;
if (0 != (ret = ensure_path_mounted("/data")))
return ret;
setup_data_media(0);
return 0;
}
Volume* v = volume_for_path(path);
if (v == NULL) {
// silent failure for sd-ext
if (strncmp(path, "/sd-ext", 7) != 0)
LOGE("unknown volume for path [%s]\n", path);
return -1;
}
if (strcmp(v->fs_type, "ramdisk") == 0) {
// the ramdisk is always mounted.
return 0;
}
int result;
result = scan_mounted_volumes();
if (result < 0) {
LOGE("failed to scan mounted volumes\n");
return -1;
}
if (mount_point == NULL)
mount_point = v->mount_point;
const MountedVolume* mv =
find_mounted_volume_by_mount_point(mount_point);
if (mv) {
// volume is already mounted
return 0;
}
mkdir(mount_point, 0755); // in case it doesn't already exist
if (fs_mgr_is_voldmanaged(v)) {
result = vold_mount_volume(mount_point, 1) == CommandOkay ? 0 : -1;
if (result == 0) return 0;
}
if (strcmp(v->fs_type, "yaffs2") == 0) {
// mount an MTD partition as a YAFFS2 filesystem.
mtd_scan_partitions();
const MtdPartition* partition;
partition = mtd_find_partition_by_name(v->blk_device);
if (partition == NULL) {
LOGE("failed to find \"%s\" partition to mount at \"%s\"\n",
v->blk_device, mount_point);
return -1;
}
return mtd_mount_partition(partition, mount_point, v->fs_type, 0);
} else if (strcmp(v->fs_type, "auto") == 0 ||
strcmp(v->fs_type, "ext4") == 0 ||
strcmp(v->fs_type, "ext3") == 0 ||
#ifdef USE_F2FS
strcmp(v->fs_type, "f2fs") == 0 ||
#endif
strcmp(v->fs_type, "rfs") == 0 ||
strcmp(v->fs_type, "vfat") == 0) {
// LOGE("main pass: %s %s %s %s\n", v->blk_device, mount_point, v->fs_type, v->fs_type2); // debug
if ((result = try_mount(v->blk_device, mount_point, v->fs_type, v->fs_options)) == 0)
return 0;
if ((result = try_mount(v->blk_device2, mount_point, v->fs_type2, v->fs_options2)) == 0)
return 0;
if ((result = try_mount(v->blk_device, mount_point, v->fs_type2, v->fs_options2)) == 0)
return 0;
return result;
} else {
// let's try mounting with the mount binary and hope for the best.
// case called by ensure_path_mounted_at_mount_point("/emmc", "/sdcard") in edifyscripting.c (this now obsolete)
// however, keep the code for clarity and eventual dual boot support using preload or other partitions in future
// keep both alternatives to not break things for MTD devices when using v->blk_device on system mount command
char mount_cmd[PATH_MAX];
if (strcmp(v->mount_point, mount_point) != 0)
sprintf(mount_cmd, "mount %s %s", v->blk_device, mount_point);
else
sprintf(mount_cmd, "mount %s", v->mount_point);
return __system(mount_cmd);
}
return -1;
}
// not thread safe because of scan_mounted_volumes()
int ensure_path_unmounted(const char* path) {
// if we are using /data/media, do not unmount /sdcard until !is_data_media_preserved()
if (is_data_media_volume_path(path)) {
if (is_data_media_preserved())
return 0;
else
return ensure_path_unmounted("/data");
}
Volume* v = volume_for_path(path);
if (v == NULL) {
LOGE("unknown volume for path [%s]\n", path);
return -1;
}
if (strcmp(v->fs_type, "ramdisk") == 0) {
// the ramdisk is always mounted; you can't unmount it.
return -1;
}
int result;
result = scan_mounted_volumes();
if (result < 0) {
LOGE("failed to scan mounted volumes\n");
return -1;
}
const MountedVolume* mv =
find_mounted_volume_by_mount_point(v->mount_point);
if (mv == NULL) {
// volume is already unmounted
return 0;
}
if (fs_mgr_is_voldmanaged(volume_for_path(v->mount_point)))
return vold_unmount_volume(v->mount_point, 0, 1) == CommandOkay ? 0 : -1;
return unmount_mounted_volume(mv);
}
// recursively deletes path except 'except' path
// this will preserve the /path dir and leave it empty
int rmtree_except(const char* path, const char* except)
{
char pathbuf[PATH_MAX];
int rc = 0;
DIR* dp = opendir(path);
if (dp == NULL) {
return -1;
}
struct dirent* de;
while ((de = readdir(dp)) != NULL) {
if (!strcmp(de->d_name, ".") || !strcmp(de->d_name, ".."))
continue;
if (except && !strcmp(de->d_name, except))
continue;
struct stat st;
snprintf(pathbuf, sizeof(pathbuf), "%s/%s", path, de->d_name);
rc = lstat(pathbuf, &st);
if (rc != 0) {
LOGE("Failed to stat %s\n", pathbuf);
break;
}
if (S_ISDIR(st.st_mode)) {
rc = rmtree_except(pathbuf, NULL);
if (rc != 0)
break;
rc = rmdir(pathbuf);
}
else {
rc = unlink(pathbuf);
}
if (rc != 0) {
LOGI("Failed to remove %s: %s\n", pathbuf, strerror(errno));
break;
}
}
closedir(dp);
return rc;
}
#ifdef USE_F2FS
extern int make_f2fs_main(int argc, char **argv);
#endif
int format_volume(const char* volume) {
// check if we're formatting primary_storage (/sdcard) on /data/media device
// in that case, issue a rm -rf like command
if (is_data_media_volume_path(volume)) {
return format_unknown_device(NULL, volume, NULL);
}
Volume* v = volume_for_path(volume);
// silent failure for non existing sd-ext (when we factory reset)
if (v == NULL) {
if (strcmp(volume, "/sd-ext") != 0)
LOGE("unknown volume \"%s\"\n", volume);
return -1;
}
// silent failure to format non existing sd-ext when defined in recovery.fstab
if (strcmp(volume, "/sd-ext") == 0) {
struct stat s;
if (0 != stat(v->blk_device, &s)) {
LOGI("Skipping format of sd-ext\n");
return -1;
}
}
if (strcmp(v->fs_type, "ramdisk") == 0) {
// you can't format the ramdisk.
LOGE("can't format_volume \"%s\"", volume);
return -1;
}
// if we're formatting a path, this will act like 'rm -rf volume'
if (strcmp(v->mount_point, volume) != 0) {
return format_unknown_device(NULL, volume, NULL);
}
// check to see if /data is being formatted, and if it is /data/media
// by default, is_data_media_preserved() == 1, so we will go to format_unknown_device()
// format_unknown_device() with null fstype will rm -rf /data, excluding /data/media path
// if preserve_data_media(0) is called, is_data_media_preserved() will return 0
// in that case, we will not use format_unknown_device() but proceed to below with a true format command issued
if (strcmp(volume, "/data") == 0 && is_data_media() && is_data_media_preserved()) {
return format_unknown_device(NULL, volume, NULL);
}
if (ensure_path_unmounted(volume) != 0) {
LOGE("format_volume failed to unmount \"%s\"\n", v->mount_point);
return -1;
}
// Only use vold format for exact matches otherwise /sdcard will be
// formatted instead of /storage/sdcard0/.android_secure
// this check is redundant as we excluded above the (volume != v->mount_point) case
if (fs_mgr_is_voldmanaged(v) && strcmp(volume, v->mount_point) == 0) {
if (ensure_path_unmounted(volume) != 0) {
LOGE("format_volume failed to unmount %s", v->mount_point);
}
if (strcmp(v->fs_type, "auto") == 0) {
// Format with current filesystem
return vold_format_volume(v->mount_point, 1) == CommandOkay ? 0 : -1;
} else {
// Format filesystem defined in fstab
return vold_custom_format_volume(v->mount_point, v->fs_type, 1) == CommandOkay ? 0 : -1;
}
}
if (strcmp(v->fs_type, "yaffs2") == 0 || strcmp(v->fs_type, "mtd") == 0) {
mtd_scan_partitions();
const MtdPartition* partition = mtd_find_partition_by_name(v->blk_device);
if (partition == NULL) {
LOGE("format_volume: no MTD partition \"%s\"\n", v->blk_device);
return -1;
}
MtdWriteContext *write = mtd_write_partition(partition);
if (write == NULL) {
LOGW("format_volume: can't open MTD \"%s\"\n", v->blk_device);
return -1;
} else if (mtd_erase_blocks(write, -1) == (off_t) -1) {
LOGW("format_volume: can't erase MTD \"%s\"\n", v->blk_device);
mtd_write_close(write);
return -1;
} else if (mtd_write_close(write)) {
LOGW("format_volume: can't close MTD \"%s\"\n", v->blk_device);
return -1;
}
return 0;
}
if (strcmp(v->fs_type, "ext4") == 0) {
int result = make_ext4fs(v->blk_device, v->length, volume, sehandle);
if (result != 0) {
LOGE("format_volume: make_ext4fs failed on %s\n", v->blk_device);
return -1;
}
return 0;
}
#ifdef USE_F2FS
if (strcmp(v->fs_type, "f2fs") == 0) {
char* args[] = { "mkfs.f2fs", v->blk_device };
if (make_f2fs_main(2, args) != 0) {
LOGE("format_volume: mkfs.f2fs failed on %s\n", v->blk_device);
return -1;
}
return 0;
}
#endif
return format_unknown_device(v->blk_device, volume, v->fs_type);
}
// mount /cache and unmount all other partitions before installing zip file
int setup_install_mounts() {
if (fstab == NULL) {
LOGE("can't set up install mounts: no fstab loaded\n");
return -1;
}
int i;
for (i = 0; i < fstab->num_entries; ++i) {
Volume* v = fstab->recs + i;
// do not unmount vold managed devices (we need this for aroma file manager zip installer to be able to see the vold devices)
if (fs_mgr_is_voldmanaged(v))
continue;
if (strcmp(v->mount_point, "/tmp") == 0 ||
strcmp(v->mount_point, "/cache") == 0) {
if (ensure_path_mounted(v->mount_point) != 0) return -1;
} else {
if (ensure_path_unmounted(v->mount_point) != 0) return -1;
}
}
return 0;
}
/* by default:
- do not unmount /data if user requests unmounting /sdcard
- do not format whole /data (include /data/media) when format /data is requested
instead, do rm -rf with /data/media excluded
*/
static int data_media_preserved_state = 1;
void preserve_data_media(int val) {
data_media_preserved_state = val;
}
int is_data_media_preserved() {
return data_media_preserved_state;
}
void setup_legacy_storage_paths() {
// sdcard symlink is done in setup_data_media()
if (is_data_media())
return;
char* primary_path = get_primary_storage_path();
if (strcmp(primary_path, "/sdcard") != 0) {
rmdir("/sdcard");
symlink(primary_path, "/sdcard");
}
}
// format to user choice fstype
// called by nandroid_restore_partition_extended() and format_ext4_or_f2fs()
// doesn't support vold managed devices
int format_device(const char *device, const char *path, const char *fs_type) {
if (is_data_media_volume_path(path)) {
// we're formatting primary_storage (/sdcard) on /data/media device: issue a rm -rf like command
return format_unknown_device(NULL, path, NULL);