// SPDX-License-Identifier: GPL-2.0
/*
 * Many of the syscalls used in this file expect some of the arguments
 * to be __user pointers not __kernel pointers.  To limit the sparse
 * noise, turn off sparse checking for this file.
 */
#ifdef __CHECKER__
#undef __CHECKER__
#warning "Sparse checking disabled for this file"
#endif

#include <linux/delay.h>
#include <linux/raid/md_u.h>
#include <linux/raid/md_p.h>

#include "do_mounts.h"

/*
 * When md (and any require personalities) are compiled into the kernel
 * (not a module), arrays can be assembles are boot time using with AUTODETECT
 * where specially marked partitions are registered with md_autodetect_dev(),
 * and with MD_BOOT where devices to be collected are given on the boot line
 * with md=.....
 * The code for that is here.
 */

#ifdef CONFIG_MD_AUTODETECT
static int __initdata raid_noautodetect;
#else
static int __initdata raid_noautodetect=1;
#endif
static int __initdata raid_autopart;

static struct {
        int minor;
        int partitioned;
        int level;
        int chunk;
        char *device_names;
} md_setup_args[256] __initdata;

static int md_setup_ents __initdata;

/*
 * Parse the command-line parameters given our kernel, but do not
 * actually try to invoke the MD device now; that is handled by
 * md_setup_drive after the low-level disk drivers have initialised.
 *
 * 27/11/1999: Fixed to work correctly with the 2.3 kernel (which
 *             assigns the task of parsing integer arguments to the
 *             invoked program now).  Added ability to initialise all
 *             the MD devices (by specifying multiple "md=" lines)
 *             instead of just one.  -- KTK
 * 18May2000: Added support for persistent-superblock arrays:
 *             md=n,0,factor,fault,device-list   uses RAID0 for device n
 *             md=n,-1,factor,fault,device-list  uses LINEAR for device n
 *             md=n,device-list      reads a RAID superblock from the devices
 *             elements in device-list are read by name_to_kdev_t so can be
 *             a hex number or something like /dev/hda1 /dev/sdb
 * 2001-06-03: Dave Cinege <dcinege@psychosis.com>
 *              Shifted name_to_kdev_t() and related operations to md_set_drive()
 *              for later execution. Rewrote section to make devfs compatible.
 */
static int __init md_setup(char *str)
{
        int minor, level, factor, fault, partitioned = 0;
        char *pername = "";
        char *str1;
        int ent;

        if (*str == 'd') {
                partitioned = 1;
                str++;
        }
        if (get_option(&str, &minor) != 2) {    /* MD Number */
                printk(KERN_WARNING "md: Too few arguments supplied to md=.\n");
                return 0;
        }
        str1 = str;
        for (ent=0 ; ent< md_setup_ents ; ent++)
                if (md_setup_args[ent].minor == minor &&
                    md_setup_args[ent].partitioned == partitioned) {
                        printk(KERN_WARNING "md: md=%s%d, Specified more than once. "
                               "Replacing previous definition.\n", partitioned?"d":"", minor);
                        break;
                }
        if (ent >= ARRAY_SIZE(md_setup_args)) {
                printk(KERN_WARNING "md: md=%s%d - too many md initialisations\n", partitioned?"d":"", minor);
                return 0;
        }
        if (ent >= md_setup_ents)
                md_setup_ents++;
        switch (get_option(&str, &level)) {     /* RAID level */
        case 2: /* could be 0 or -1.. */
                if (level == 0 || level == LEVEL_LINEAR) {
                        if (get_option(&str, &factor) != 2 ||   /* Chunk Size */
                                        get_option(&str, &fault) != 2) {
                                printk(KERN_WARNING "md: Too few arguments supplied to md=.\n");
                                return 0;
                        }
                        md_setup_args[ent].level = level;
                        md_setup_args[ent].chunk = 1 << (factor+12);
                        if (level ==  LEVEL_LINEAR)
                                pername = "linear";
                        else
                                pername = "raid0";
                        break;
                }
                /* FALL THROUGH */
        case 1: /* the first device is numeric */
                str = str1;
                /* FALL THROUGH */
        case 0:
                md_setup_args[ent].level = LEVEL_NONE;
                pername="super-block";
        }

        printk(KERN_INFO "md: Will configure md%d (%s) from %s, below.\n",
                minor, pername, str);
        md_setup_args[ent].device_names = str;
        md_setup_args[ent].partitioned = partitioned;
        md_setup_args[ent].minor = minor;

        return 1;
}

static void __init md_setup_drive(void)
{
        int minor, i, ent, partitioned;
        dev_t dev;
        dev_t devices[MD_SB_DISKS+1];

        for (ent = 0; ent < md_setup_ents ; ent++) {
                int fd;
                int err = 0;
                char *devname;
                mdu_disk_info_t dinfo;
                char name[16];

                minor = md_setup_args[ent].minor;
                partitioned = md_setup_args[ent].partitioned;
                devname = md_setup_args[ent].device_names;

                sprintf(name, "/dev/md%s%d", partitioned?"_d":"", minor);
                if (partitioned)
                        dev = MKDEV(mdp_major, minor << MdpMinorShift);
                else
                        dev = MKDEV(MD_MAJOR, minor);
                create_dev(name, dev);
                for (i = 0; i < MD_SB_DISKS && devname != NULL; i++) {
                        char *p;
                        char comp_name[64];
                        u32 rdev;

                        p = strchr(devname, ',');
                        if (p)
                                *p++ = 0;

                        dev = name_to_dev_t(devname);
                        if (strncmp(devname, "/dev/", 5) == 0)
                                devname += 5;
                        snprintf(comp_name, 63, "/dev/%s", devname);
                        rdev = bstat(comp_name);
                        if (rdev)
                                dev = new_decode_dev(rdev);
                        if (!dev) {
                                printk(KERN_WARNING "md: Unknown device name: %s\n", devname);
                                break;
                        }

                        devices[i] = dev;

                        devname = p;
                }
                devices[i] = 0;

                if (!i)
                        continue;

                printk(KERN_INFO "md: Loading md%s%d: %s\n",
                        partitioned ? "_d" : "", minor,
                        md_setup_args[ent].device_names);

                fd = sys_open(name, 0, 0);
                if (fd < 0) {
                        printk(KERN_ERR "md: open failed - cannot start "
                                        "array %s\n", name);
                        continue;
                }
                if (sys_ioctl(fd, SET_ARRAY_INFO, 0) == -EBUSY) {
                        printk(KERN_WARNING
                               "md: Ignoring md=%d, already autodetected. (Use raid=noautodetect)\n",
                               minor);
                        sys_close(fd);
                        continue;
                }

                if (md_setup_args[ent].level != LEVEL_NONE) {
                        /* non-persistent */
                        mdu_array_info_t ainfo;
                        ainfo.level = md_setup_args[ent].level;
                        ainfo.size = 0;
                        ainfo.nr_disks =0;
                        ainfo.raid_disks =0;
                        while (devices[ainfo.raid_disks])
                                ainfo.raid_disks++;
                        ainfo.md_minor =minor;
                        ainfo.not_persistent = 1;

                        ainfo.state = (1 << MD_SB_CLEAN);
                        ainfo.layout = 0;
                        ainfo.chunk_size = md_setup_args[ent].chunk;
                        err = sys_ioctl(fd, SET_ARRAY_INFO, (long)&ainfo);
                        for (i = 0; !err && i <= MD_SB_DISKS; i++) {
                                dev = devices[i];
                                if (!dev)
                                        break;
                                dinfo.number = i;
                                dinfo.raid_disk = i;
                                dinfo.state = (1<<MD_DISK_ACTIVE)|(1<<MD_DISK_SYNC);
                                dinfo.major = MAJOR(dev);
                                dinfo.minor = MINOR(dev);
                                err = sys_ioctl(fd, ADD_NEW_DISK, (long)&dinfo);
                        }
                } else {
                        /* persistent */
                        for (i = 0; i <= MD_SB_DISKS; i++) {
                                dev = devices[i];
                                if (!dev)
                                        break;
                                dinfo.major = MAJOR(dev);
                                dinfo.minor = MINOR(dev);
                                sys_ioctl(fd, ADD_NEW_DISK, (long)&dinfo);
                        }
                }
                if (!err)
                        err = sys_ioctl(fd, RUN_ARRAY, 0);
                if (err)
                        printk(KERN_WARNING "md: starting md%d failed\n", minor);
                else {
                        /* reread the partition table.
                         * I (neilb) and not sure why this is needed, but I cannot
                         * boot a kernel with devfs compiled in from partitioned md
                         * array without it
                         */
                        sys_close(fd);
                        fd = sys_open(name, 0, 0);
                        sys_ioctl(fd, BLKRRPART, 0);
                }
                sys_close(fd);
        }
}

static int __init raid_setup(char *str)
{
        int len, pos;

        len = strlen(str) + 1;
        pos = 0;

        while (pos < len) {
                char *comma = strchr(str+pos, ',');
                int wlen;
                if (comma)
                        wlen = (comma-str)-pos;
                else    wlen = (len-1)-pos;

                if (!strncmp(str, "noautodetect", wlen))
                        raid_noautodetect = 1;
                if (!strncmp(str, "autodetect", wlen))
                        raid_noautodetect = 0;
                if (strncmp(str, "partitionable", wlen)==0)
                        raid_autopart = 1;
                if (strncmp(str, "part", wlen)==0)
                        raid_autopart = 1;
                pos += wlen+1;
        }
        return 1;
}

__setup("raid=", raid_setup);
__setup("md=", md_setup);

static void __init autodetect_raid(void)
{
        int fd;

        /*
         * Since we don't want to detect and use half a raid array, we need to
         * wait for the known devices to complete their probing
         */
        printk(KERN_INFO "md: Waiting for all devices to be available before autodetect\n");
        printk(KERN_INFO "md: If you don't use raid, use raid=noautodetect\n");

        wait_for_device_probe();

        fd = sys_open("/dev/md0", 0, 0);
        if (fd >= 0) {
                sys_ioctl(fd, RAID_AUTORUN, raid_autopart);
                sys_close(fd);
        }
}

void __init md_run_setup(void)
{
        create_dev("/dev/md0", MKDEV(MD_MAJOR, 0));

        if (raid_noautodetect)
                printk(KERN_INFO "md: Skipping autodetection of RAID arrays. (raid=autodetect will force)\n");
        else
                autodetect_raid();
        md_setup_drive();
}