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/*
* 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 <fcntl.h>
#include <errno.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/mount.h>
#include <linux/ext2_fs.h>
#include <linux/ext3_fs.h>
#include "vold.h"
#include "volmgr.h"
#include "volmgr_ext3.h"
#include "logwrapper.h"
#define EXT_DEBUG 0
static char E2FSCK_PATH[] = "/system/bin/e2fsck";
int ext_identify(blkdev_t *dev)
{
int rc = -1;
int fd;
struct ext3_super_block sb;
char *devpath;
#if EXT_DEBUG
LOG_VOL("ext_identify(%d:%d):", dev-major, dev->minor);
#endif
devpath = blkdev_get_devpath(dev);
if ((fd = open(devpath, O_RDWR)) < 0) {
LOGE("Unable to open device '%s' (%s)", devpath,
strerror(errno));
free(devpath);
return -errno;
}
if (lseek(fd, 1024, SEEK_SET) < 0) {
LOGE("Unable to lseek to get superblock (%s)", strerror(errno));
rc = -errno;
goto out;
}
if (read(fd, &sb, sizeof(sb)) != sizeof(sb)) {
LOGE("Unable to read superblock (%s)", strerror(errno));
rc = -errno;
goto out;
}
if (sb.s_magic == EXT2_SUPER_MAGIC ||
sb.s_magic == EXT3_SUPER_MAGIC)
rc = 0;
else
rc = -ENODATA;
out:
#if EXT_DEBUG
LOG_VOL("ext_identify(%s): rc = %d", devpath, rc);
#endif
free(devpath);
close(fd);
return rc;
}
int ext_check(blkdev_t *dev)
{
char *devpath;
#if EXT_DEBUG
LOG_VOL("ext_check(%s):", dev->dev_fspath);
#endif
devpath = blkdev_get_devpath(dev);
if (access(E2FSCK_PATH, X_OK)) {
LOGE("ext_check(%s): %s not found (skipping checks)",
devpath, E2FSCK_PATH);
free(devpath);
return 0;
}
char *args[5];
args[0] = E2FSCK_PATH;
args[1] = "-v";
args[2] = "-p";
args[3] = devpath;
args[4] = NULL;
int rc = logwrap(4, args);
if (rc == 0) {
LOG_VOL("filesystem '%s' had no errors", devpath);
} else if (rc == 1) {
LOG_VOL("filesystem '%s' had corrected errors", devpath);
rc = 0;
} else if (rc == 2) {
LOGE("VOL volume '%s' had corrected errors (system should be rebooted)", devpath);
rc = -EIO;
} else if (rc == 4) {
LOGE("VOL volume '%s' had uncorrectable errors", devpath);
rc = -EIO;
} else if (rc == 8) {
LOGE("Operational error while checking volume '%s'", devpath);
rc = -EIO;
} else {
LOGE("Unknown e2fsck exit code (%d)", rc);
rc = -EIO;
}
free(devpath);
return rc;
}
int ext_mount(blkdev_t *dev, volume_t *vol, boolean safe_mode)
{
#if EXT_DEBUG
LOG_VOL("ext_mount(%s, %s, %d):", dev->dev_fspath, vol->mount_point, safe_mode);
#endif
char *fs[] = { "ext3", "ext2", NULL };
char *devpath;
devpath = blkdev_get_devpath(dev);
int flags, rc = 0;
flags = MS_NODEV | MS_NOEXEC | MS_NOSUID | MS_NOATIME | MS_NODIRATIME;
if (safe_mode)
flags |= MS_SYNCHRONOUS;
if (vol->state == volstate_mounted) {
LOG_VOL("Remounting %s on %s, safe mode %d", devpath,
vol->mount_point, safe_mode);
flags |= MS_REMOUNT;
}
char **f;
for (f = fs; *f != NULL; f++) {
rc = mount(devpath, vol->mount_point, *f, flags, NULL);
if (rc && errno == EROFS) {
LOGE("ext_mount(%s, %s): Read only filesystem - retrying mount RO",
devpath, vol->mount_point);
flags |= MS_RDONLY;
rc = mount(devpath, vol->mount_point, *f, flags, NULL);
}
#if EXT_DEBUG
LOG_VOL("ext_mount(%s, %s): %s mount rc = %d", devpath, *f,
vol->mount_point, rc);
#endif
if (!rc)
break;
}
free(devpath);
// Chmod the mount point so that its a free-for-all.
// (required for consistency with VFAT.. sigh)
if (chmod(vol->mount_point, 0777) < 0) {
LOGE("Failed to chmod %s (%s)", vol->mount_point, strerror(errno));
return -errno;
}
return rc;
}
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