/*
 * Copyright (c) 2013-2019 Huawei Technologies Co., Ltd. All rights reserved.
 * Copyright (c) 2020-2021 Huawei Device Co., Ltd. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without modification,
 * are permitted provided that the following conditions are met:
 *
 * 1. Redistributions of source code must retain the above copyright notice, this list of
 *    conditions and the following disclaimer.
 *
 * 2. Redistributions in binary form must reproduce the above copyright notice, this list
 *    of conditions and the following disclaimer in the documentation and/or other materials
 *    provided with the distribution.
 *
 * 3. Neither the name of the copyright holder nor the names of its contributors may be used
 *    to endorse or promote products derived from this software without specific prior written
 *    permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR
 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */
#include "los_base.h"
#include "los_typedef.h"
#include "string.h"
#if defined(LOSCFG_STORAGE_SPINOR) || defined(LOSCFG_STORAGE_SPINAND)
#include "mtd_partition.h"
#endif
#ifdef LOSCFG_DRIVERS_MMC
#include "mmc/block.h"
#include "disk.h"
#endif
#include "sys/mount.h"
#ifdef LOSCFG_PLATFORM_ROOTFS
#include "los_rootfs.h"
#endif
#include "mtd_list.h"
#include "fs/path_cache.h"

#ifdef LOSCFG_STORAGE_SPINOR
#define DEV_STORAGE_PATH       "/dev/spinorblk2"
#define SECOND_MTD_PART_NUM 2
#define STORAGE_SIZE 0x80000
#endif

#ifdef LOSCFG_STORAGE_SPINAND
#define DEV_STORAGE_PATH       "/dev/nandblk2"
#define SECOND_MTD_PART_NUM 2
#define STORAGE_SIZE 0xa00000
#endif

#ifdef LOSCFG_STORAGE_EMMC
#include "ff.h"
#define STORAGE_SIZE 0x3200000
STATIC los_disk *g_emmcDisk = NULL;
#endif

#ifdef __cplusplus
#if __cplusplus
extern "C" {
#endif /* __cplusplus */
#endif /* __cplusplus */

#ifndef LOSCFG_SECURITY_BOOT
STATIC INT32 g_alignSize = 0;
#endif

#define VFAT_STORAGE_MOUNT_DIR_MODE 0777
#define DEFAULT_STORAGE_MOUNT_DIR_MODE 0755

#ifdef LOSCFG_DRIVERS_MMC
los_disk *GetMmcDisk(UINT8 type)
{
    const CHAR *mmcDevHead = "/dev/mmcblk";

    for (INT32 diskId = 0; diskId < SYS_MAX_DISK; diskId++) {
        los_disk *disk = get_disk(diskId);
        if (disk == NULL) {
            continue;
        } else if (disk->disk_name == NULL) {
            continue;
        } else if (strncmp(disk->disk_name, mmcDevHead, strlen(mmcDevHead))) {
            continue;
        } else {
            if (disk->type == type) {
                return disk;
            }
        }
    }
    PRINT_ERR("Cannot find the mmc disk!\n");
    return NULL;
}
#endif

#ifdef LOSCFG_STORAGE_EMMC
STATIC const CHAR *AddEmmcRootfsPart(INT32 rootAddr, INT32 rootSize)
{
    INT32 ret;

    struct mmc_block *block = (struct mmc_block *)((struct drv_data *)g_emmcDisk->dev->data)->priv;
    const char *node_name = mmc_block_get_node_name(block);
    if (los_disk_deinit(g_emmcDisk->disk_id) != ENOERR) {
        PRINT_ERR("Failed to deinit emmc disk!\n");
        return NULL;
    }

    struct disk_divide_info *emmc = get_emmc();
    ret = add_mmc_partition(emmc, rootAddr / EMMC_SEC_SIZE, rootSize / EMMC_SEC_SIZE);
    if (ret != LOS_OK) {
        PRINT_ERR("Failed to add mmc root partition!\n");
        return NULL;
    } else {
        UINT64 storageStartCnt = (rootAddr + rootSize) / EMMC_SEC_SIZE;
        UINT64 storageSizeCnt = STORAGE_SIZE / EMMC_SEC_SIZE;
        UINT64 userdataStartCnt = storageStartCnt + storageSizeCnt;
        UINT64 userdataSizeCnt = g_emmcDisk->sector_count - userdataStartCnt;
        ret = add_mmc_partition(emmc, storageStartCnt, storageSizeCnt);
        if (ret != LOS_OK) {
            PRINT_ERR("Failed to add mmc storage partition!\n");
        }
        ret = add_mmc_partition(emmc, userdataStartCnt, userdataSizeCnt);
        if (ret != LOS_OK) {
            PRINT_ERR("Failed to add mmc userdata partition!\n");
        }
        LOS_Msleep(10); /* waiting for device identification */
        INT32 diskId = los_alloc_diskid_byname(node_name);
        if (diskId < 0) {
            PRINT_ERR("Failed to alloc disk %s!\n", node_name);
            return NULL;
        }
        if (los_disk_init(node_name, mmc_block_get_bops(block), (void *)block, diskId, emmc) != ENOERR) {
            PRINT_ERR("Failed to init emmc disk!\n");
            return NULL;
        }
        return node_name;
    }
}
#endif

STATIC const CHAR *GetDevName(const CHAR *rootType, INT32 rootAddr, INT32 rootSize)
{
    const CHAR *rootDev = NULL;

#if defined(LOSCFG_STORAGE_SPINOR) || defined(LOSCFG_STORAGE_SPINAND)
    INT32 ret;
    if (strcmp(rootType, "flash") == 0) {
        ret = add_mtd_partition(FLASH_TYPE, rootAddr, rootSize, 0);
        if (ret != LOS_OK) {
            PRINT_ERR("Failed to add spinor/spinand root partition!\n");
        } else {
            rootDev = FLASH_DEV_NAME;
            ret = add_mtd_partition(FLASH_TYPE, (rootAddr + rootSize), STORAGE_SIZE, SECOND_MTD_PART_NUM);
            if (ret != LOS_OK) {
                PRINT_ERR("Failed to add spinor/spinand storage partition!\n");
            }
        }
    } else
#endif

#ifdef LOSCFG_DRIVERS_USB_MASS_STORAGE
    if (strcmp(rootType, "usb") == 0) {
        rootDev = "/dev/sda";
    } else
#endif

#ifdef LOSCFG_DRIVERS_SD
    if (strcmp(rootType, "sdcard") == 0) {
        los_disk *sdDisk = GetMmcDisk(OTHERS);
        if (sdDisk == NULL) {
            PRINT_ERR("Get sdcard failed!\n");
        } else {
            rootDev = sdDisk->disk_name;
        }
    } else
#endif

#ifdef LOSCFG_STORAGE_EMMC
    if (strcmp(rootType, "emmc") == 0) {
        rootDev = AddEmmcRootfsPart(rootAddr, rootSize);
    } else
#endif

#ifdef LOSCFG_PLATFORM_QEMU_ARM_VIRT_CA7
#define CFIFLASH_CAPACITY   64 * 1024 * 1024
    if (strcmp(rootType, "cfi-flash") == 0) {
        INT32 ret;
        extern INT32 add_mtd_partition(const CHAR *type, UINT32 startAddr, UINT32 length, UINT32 partitionNum);
        ret = add_mtd_partition("cfi-flash", rootAddr, rootSize, 0);
        if (ret != LOS_OK) {
            PRINT_ERR("Failed to add cfi-flash root partition!\n");
        } else {
            rootDev = "/dev/cfiflash0";
            ret = add_mtd_partition("cfi-flash", (rootAddr + rootSize),
                                CFIFLASH_CAPACITY - rootAddr - rootSize, 1);
            if (ret != LOS_OK) {
                PRINT_ERR("Failed to add cfi-flash storage partition!\n");
            }
        }
    } else
#endif
    {
        PRINT_ERR("Failed to find root dev type: %s\n", rootType);
    }
    return rootDev;
}

#ifndef LOSCFG_SECURITY_BOOT
STATIC INT32 GetArgs(CHAR **args)
{
#ifdef LOSCFG_QUICK_START
    *args = OsGetArgsAddr();
    return LOS_OK;

#else
    INT32 ret;
    INT32 i;
    INT32 len = 0;
    CHAR *cmdLine = NULL;
    CHAR *tmp = NULL;
    const CHAR *bootargName = "bootargs=";

    cmdLine = (CHAR *)malloc(COMMAND_LINE_SIZE);
    if (cmdLine == NULL) {
        PRINT_ERR("Malloc cmdLine space error!\n");
        return LOS_NOK;
    }

#ifdef LOSCFG_STORAGE_EMMC
    g_emmcDisk = GetMmcDisk(EMMC);
    if (g_emmcDisk == NULL) {
        PRINT_ERR("Get EMMC disk failed!\n");
        goto ERROUT;
    }
    ret = los_disk_read(g_emmcDisk->disk_id, cmdLine, COMMAND_LINE_ADDR / EMMC_SEC_SIZE,
                        COMMAND_LINE_SIZE / EMMC_SEC_SIZE);
    if (ret != 0) {
        PRINT_ERR("Read EMMC command line failed!\n");
        goto ERROUT;
    }
    g_alignSize = EMMC_SEC_SIZE;
#endif

#if defined(LOSCFG_STORAGE_SPINOR) || defined(LOSCFG_STORAGE_SPINAND)
    struct MtdDev *mtd = GetMtd(FLASH_TYPE);
    if (mtd == NULL) {
        PRINT_ERR("Get spinor mtd failed!\n");
        goto ERROUT;
    }
    g_alignSize = mtd->eraseSize;
    ret = mtd->read(mtd, COMMAND_LINE_ADDR, COMMAND_LINE_SIZE, cmdLine);
    if (ret != COMMAND_LINE_SIZE) {
        PRINT_ERR("Read spinor command line failed!\n");
        goto ERROUT;
    }
#endif
#ifdef LOSCFG_PLATFORM_QEMU_ARM_VIRT_CA7
    /*
     * TODO: Implement method of fetching bootargs for
     *       Qemu ARM virtual platform. If used without
     *       bootloader it will pass DTB by default.
     */
    (void)ret;
    cmdLine = "bootargs=root=cfi-flash fstype=jffs2 rootaddr=0xA00000 rootsize=27M";
#endif

    for (i = 0; i < COMMAND_LINE_SIZE; i += len + 1) {
        len = strlen(cmdLine + i);
        tmp = strstr(cmdLine + i, bootargName);
        if (tmp != NULL) {
            *args = strdup(tmp + strlen(bootargName));
            if (*args == NULL) {
                goto ERROUT;
            }
            free(cmdLine);
            return LOS_OK;
        }
    }
    PRINT_ERR("Cannot find bootargs!\n");

ERROUT:
    free(cmdLine);
    return LOS_NOK;
#endif
}

STATIC INT32 MatchRootPos(CHAR *p, const CHAR *rootInfoName, INT32 *rootInfo)
{
    UINT32 offset;
    CHAR *value = NULL;

    if (strncmp(p, rootInfoName, strlen(rootInfoName)) == 0) {
        value = p + strlen(rootInfoName);
        offset = strspn(value, DEC_NUMBER_STRING);
        if (strcmp(p + strlen(p) - 1, "M") == 0) {
            if ((offset < (strlen(value) - 1)) || (sscanf_s(value, "%d", rootInfo) <= 0)) {
                goto ERROUT;
            }
            *rootInfo = *rootInfo * BYTES_PER_MBYTE;
        } else if (strcmp(p + strlen(p) - 1, "K") == 0) {
            if ((offset < (strlen(value) - 1)) || (sscanf_s(value, "%d", rootInfo) <= 0)) {
                goto ERROUT;
            }
            *rootInfo = *rootInfo * BYTES_PER_KBYTE;
        } else if (sscanf_s(value, "0x%x", rootInfo) > 0) {
            value += strlen("0x");
            if (strspn(value, HEX_NUMBER_STRING) < strlen(value)) {
                goto ERROUT;
            }
        } else {
            goto ERROUT;
        }
    }

    if ((*rootInfo >= 0) && (g_alignSize != 0) && ((UINT32)(*rootInfo) & (UINT32)(g_alignSize - 1))) {
        PRINT_ERR("The bootarg \"%s\" will be 0x%x aligned!\n", p, g_alignSize);
    }
    return LOS_OK;

ERROUT:
    PRINT_ERR("Invalid bootarg \"%s\"!\n", p);
    return LOS_NOK;
}

STATIC INT32 MatchRootInfo(CHAR *p, CHAR **rootType, CHAR **fsType, INT32 *rootAddr, INT32 *rootSize)
{
    const CHAR *rootName = "root=";
    const CHAR *fsName = "fstype=";
    const CHAR *rootAddrName = "rootaddr=";
    const CHAR *rootSizeName = "rootsize=";

    if ((*rootType == NULL) && (strncmp(p, rootName, strlen(rootName)) == 0)) {
        *rootType = strdup(p + strlen(rootName));
        if (*rootType == NULL) {
            return LOS_NOK;
        }
        return LOS_OK;
    }

    if ((*fsType == NULL) && (strncmp(p, fsName, strlen(fsName)) == 0)) {
        *fsType = strdup(p + strlen(fsName));
        if (*fsType == NULL) {
            return LOS_NOK;
        }
        return LOS_OK;
    }

    if (*rootAddr < 0) {
        if (MatchRootPos(p, rootAddrName, rootAddr) != LOS_OK) {
            return LOS_NOK;
        } else if (*rootAddr >= 0) {
            return LOS_OK;
        }
    }

    if (*rootSize < 0) {
        if (MatchRootPos(p, rootSizeName, rootSize) != LOS_OK) {
            return LOS_NOK;
        }
    }

    return LOS_OK;
}

STATIC INT32 GetRootType(CHAR **rootType, CHAR **fsType, INT32 *rootAddr, INT32 *rootSize)
{
    CHAR *args = NULL;
    CHAR *p = NULL;

    if (GetArgs(&args) != LOS_OK) {
        PRINT_ERR("Cannot get bootargs!\n");
        return LOS_NOK;
    }
#ifndef LOSCFG_QUICK_START
    CHAR *argsBak = NULL;
    argsBak = args;
#endif
    p = strsep(&args, " ");
    while (p != NULL) {
        if (MatchRootInfo(p, rootType, fsType, rootAddr, rootSize) != LOS_OK) {
            goto ERROUT;
        }
        p = strsep(&args, " ");
    }
    if ((*fsType != NULL) && (*rootType != NULL)) {
#ifndef LOSCFG_QUICK_START
        free(argsBak);
#endif
        return LOS_OK;
    }

ERROUT:
    PRINT_ERR("Invalid rootfs information!\n");
    if (*rootType != NULL) {
        free(*rootType);
        *rootType = NULL;
    }
    if (*fsType != NULL) {
        free(*fsType);
        *fsType = NULL;
    }
#ifndef LOSCFG_QUICK_START
    free(argsBak);
#endif
    return LOS_NOK;
}
#endif

#ifdef LOSCFG_STORAGE_EMMC
STATIC VOID OsMountUserdata(const CHAR *fsType)
{
    INT32 ret;
    INT32 err;
    const CHAR *userdataDir = "/userdata";
    ret = mkdir(userdataDir, VFAT_STORAGE_MOUNT_DIR_MODE);
    if (ret != LOS_OK) {
        err = get_errno();
        PRINT_ERR("Failed to reserve vnode /userdata, errno %d: %s\n", err, strerror(err));
        return;
    }
    CHAR emmcUserdataDev[DISK_NAME] = {0};
    if (snprintf_s(emmcUserdataDev, sizeof(emmcUserdataDev), sizeof(emmcUserdataDev) - 1,
        "%s%s", g_emmcDisk->disk_name, "p2") < 0) {
        PRINT_ERR("Failed to get emmc userdata dev name!\n");
        return;
    }
    ret = mount(emmcUserdataDev, userdataDir, fsType, 0, "umask=000");
    if (ret == LOS_OK) {
        return;
    }
    err = get_errno();
    if (err == ENOENT) {
#ifdef LOSCFG_FS_FAT
        ret = format(emmcUserdataDev, 0, FM_FAT32);
        if (ret != LOS_OK) {
            PRINT_ERR("Failed to format %s\n", emmcUserdataDev);
            return;
        }
#endif
        ret = mount(emmcUserdataDev, userdataDir, fsType, 0, "umask=000");
        if (ret != LOS_OK) {
            err = get_errno();
            PRINT_ERR("Failed to mount /userdata, errno %d: %s\n", err, strerror(err));
        }
    } else {
        PRINT_ERR("Failed to mount /userdata, errno %d: %s\n", err, strerror(err));
    }
    return;
}
#endif

STATIC INT32 OsMountRootfsAndUserfs(const CHAR *rootDev, const CHAR *fsType)
{
    INT32 ret;
    INT32 err;
    if (strcmp(fsType, "vfat") == 0) {
        ret = mount(rootDev, "/", fsType, MS_RDONLY, NULL);
        if (ret != LOS_OK) {
            err = get_errno();
            PRINT_ERR("Failed to mount vfat rootfs, errno %d: %s\n", err, strerror(err));
            return ret;
        }
#ifdef LOSCFG_STORAGE_EMMC
        ret = mkdir("/storage", VFAT_STORAGE_MOUNT_DIR_MODE);
        if ((ret != LOS_OK) && ((err = get_errno()) != EEXIST)) {
            PRINT_ERR("Failed to reserve vnode /storage, errno %d: %s\n", err, strerror(err));
        } else {
            CHAR emmcStorageDev[DISK_NAME] = {0};
            if (snprintf_s(emmcStorageDev, sizeof(emmcStorageDev), sizeof(emmcStorageDev) - 1,
                "%s%s", g_emmcDisk->disk_name, "p1") < 0) {
                PRINT_ERR("Failed to get emmc storage dev name!\n");
            } else {
                ret = mount(emmcStorageDev, "/storage", fsType, 0, "umask=000");
                if (ret != LOS_OK) {
                    err = get_errno();
                    PRINT_ERR("Failed to mount /storage, errno %d: %s\n", err, strerror(err));
                }
            }
        }
        OsMountUserdata(fsType);
#endif
    } else {
        ret = mount(rootDev, "/", fsType, MS_RDONLY, NULL);
        if (ret != LOS_OK) {
            err = get_errno();
            PRINT_ERR("Failed to mount rootfs,rootDev %s, errno %d: %s\n", rootDev, err, strerror(err));
            return ret;
        }
#if defined(LOSCFG_STORAGE_SPINOR) || defined(LOSCFG_STORAGE_SPINAND)
        ret = mkdir("/storage", DEFAULT_STORAGE_MOUNT_DIR_MODE);
        if ((ret != LOS_OK) && ((err = get_errno()) != EEXIST)) {
            PRINT_ERR("Failed to reserve vnode /storage, errno %d: %s\n", err, strerror(err));
        } else {
            ret = mount(DEV_STORAGE_PATH, "/storage", fsType, 0, NULL);
            if (ret != LOS_OK) {
                err = get_errno();
                PRINT_ERR("Failed to mount /storage, errno %d: %s\n", err, strerror(err));
            }
        }
#endif
#ifdef LOSCFG_PLATFORM_QEMU_ARM_VIRT_CA7
        ret = mkdir("/storage", DEFAULT_STORAGE_MOUNT_DIR_MODE);
        if (ret != LOS_OK) {
            err = get_errno();
            PRINT_ERR("Failed to reserve inode /storage, errno %d: %s\n", err, strerror(err));
        } else {
            ret = mount("/dev/cfiflash1", "/storage", fsType, 0, NULL);
            if (ret != LOS_OK) {
                err = get_errno();
                PRINT_ERR("Failed to mount /storage, errno %d: %s\n", err, strerror(err));
            }
        }
#endif
    }
    return LOS_OK;
}

INT32 OsMountRootfs(VOID)
{
    INT32 ret = LOS_OK;
    INT32 err;
    INT32 rootAddr = -1;
    INT32 rootSize = -1;
    CHAR *rootType = NULL;
    CHAR *fsType = NULL;
    const CHAR *rootDev = NULL;

#ifdef LOSCFG_SECURITY_BOOT
    rootType = strdup(ROOTFS_ROOT_TYPE);
    fsType = strdup(ROOTFS_FS_TYPE);
    rootAddr = ROOTFS_FLASH_ADDR;
    rootSize = ROOTFS_FLASH_SIZE;
#else
    ret = GetRootType(&rootType, &fsType, &rootAddr, &rootSize);
    if (ret != LOS_OK) {
        return ret;
    }
    rootAddr = (rootAddr >= 0) ? rootAddr : ROOTFS_FLASH_ADDR;
    rootSize = (rootSize >= 0) ? rootSize : ROOTFS_FLASH_SIZE;
#endif

    rootDev = GetDevName(rootType, rootAddr, rootSize);
    if (rootDev != NULL) {
        ret = OsMountRootfsAndUserfs(rootDev, fsType);
        if (ret != LOS_OK) {
            err = get_errno();
            PRINT_ERR("Failed to mount rootfs, errno %d: %s\n", err, strerror(err));
        }
    }

    free(rootType);
    free(fsType);
    return ret;
}