LXR linux/init/do_mounts

   1// SPDX-License-Identifier: GPL-2.0
   2#include <linux/delay.h>
   3#include <linux/raid/md_u.h>
   4#include <linux/raid/md_p.h>
   5
   6#include "do_mounts.h"
   7
   8/*
   9 * When md (and any require personalities) are compiled into the kernel
  10 * (not a module), arrays can be assembles are boot time using with AUTODETECT
  11 * where specially marked partitions are registered with md_autodetect_dev(),
  12 * and with MD_BOOT where devices to be collected are given on the boot line
  13 * with md=.....
  14 * The code for that is here.
  15 */
  16
  17#ifdef CONFIG_MD_AUTODETECT
  18static int __initdata raid_noautodetect;
  19#else
  20static int __initdata raid_noautodetect=1;
  21#endif
  22static int __initdata raid_autopart;
  23
  24static struct {
  25        int minor;
  26        int partitioned;
  27        int level;
  28        int chunk;
  29        char *device_names;
  30} md_setup_args[256] __initdata;
  31
  32static int md_setup_ents __initdata;
  33
  34/*
  35 * Parse the command-line parameters given our kernel, but do not
  36 * actually try to invoke the MD device now; that is handled by
  37 * md_setup_drive after the low-level disk drivers have initialised.
  38 *
  39 * 27/11/1999: Fixed to work correctly with the 2.3 kernel (which
  40 *             assigns the task of parsing integer arguments to the
  41 *             invoked program now).  Added ability to initialise all
  42 *             the MD devices (by specifying multiple "md=" lines)
  43 *             instead of just one.  -- KTK
  44 * 18May2000: Added support for persistent-superblock arrays:
  45 *             md=n,0,factor,fault,device-list   uses RAID0 for device n
  46 *             md=n,-1,factor,fault,device-list  uses LINEAR for device n
  47 *             md=n,device-list      reads a RAID superblock from the devices
  48 *             elements in device-list are read by name_to_kdev_t so can be
  49 *             a hex number or something like /dev/hda1 /dev/sdb
  50 * 2001-06-03: Dave Cinege <dcinege@psychosis.com>
  51 *              Shifted name_to_kdev_t() and related operations to md_set_drive()
  52 *              for later execution. Rewrote section to make devfs compatible.
  53 */
  54static int __init md_setup(char *str)
  55{
  56        int minor, level, factor, fault, partitioned = 0;
  57        char *pername = "";
  58        char *str1;
  59        int ent;
  60
  61        if (*str == 'd') {
  62                partitioned = 1;
  63                str++;
  64        }
  65        if (get_option(&str, &minor) != 2) {    /* MD Number */
  66                printk(KERN_WARNING "md: Too few arguments supplied to md=.\n");
  67                return 0;
  68        }
  69        str1 = str;
  70        for (ent=0 ; ent< md_setup_ents ; ent++)
  71                if (md_setup_args[ent].minor == minor &&
  72                    md_setup_args[ent].partitioned == partitioned) {
  73                        printk(KERN_WARNING "md: md=%s%d, Specified more than once. "
  74                               "Replacing previous definition.\n", partitioned?"d":"", minor);
  75                        break;
  76                }
  77        if (ent >= ARRAY_SIZE(md_setup_args)) {
  78                printk(KERN_WARNING "md: md=%s%d - too many md initialisations\n", partitioned?"d":"", minor);
  79                return 0;
  80        }
  81        if (ent >= md_setup_ents)
  82                md_setup_ents++;
  83        switch (get_option(&str, &level)) {     /* RAID level */
  84        case 2: /* could be 0 or -1.. */
  85                if (level == 0 || level == LEVEL_LINEAR) {
  86                        if (get_option(&str, &factor) != 2 ||   /* Chunk Size */
  87                                        get_option(&str, &fault) != 2) {
  88                                printk(KERN_WARNING "md: Too few arguments supplied to md=.\n");
  89                                return 0;
  90                        }
  91                        md_setup_args[ent].level = level;
  92                        md_setup_args[ent].chunk = 1 << (factor+12);
  93                        if (level ==  LEVEL_LINEAR)
  94                                pername = "linear";
  95                        else
  96                                pername = "raid0";
  97                        break;
  98                }
  99                /* FALL THROUGH */
 100        case 1: /* the first device is numeric */
 101                str = str1;
 102                /* FALL THROUGH */
 103        case 0:
 104                md_setup_args[ent].level = LEVEL_NONE;
 105                pername="super-block";
 106        }
 107
 108        printk(KERN_INFO "md: Will configure md%d (%s) from %s, below.\n",
 109                minor, pername, str);
 110        md_setup_args[ent].device_names = str;
 111        md_setup_args[ent].partitioned = partitioned;
 112        md_setup_args[ent].minor = minor;
 113
 114        return 1;
 115}
 116
 117static void __init md_setup_drive(void)
 118{
 119        int minor, i, ent, partitioned;
 120        dev_t dev;
 121        dev_t devices[MD_SB_DISKS+1];
 122
 123        for (ent = 0; ent < md_setup_ents ; ent++) {
 124                int fd;
 125                int err = 0;
 126                char *devname;
 127                mdu_disk_info_t dinfo;
 128                char name[16];
 129
 130                minor = md_setup_args[ent].minor;
 131                partitioned = md_setup_args[ent].partitioned;
 132                devname = md_setup_args[ent].device_names;
 133
 134                sprintf(name, "/dev/md%s%d", partitioned?"_d":"", minor);
 135                if (partitioned)
 136                        dev = MKDEV(mdp_major, minor << MdpMinorShift);
 137                else
 138                        dev = MKDEV(MD_MAJOR, minor);
 139                create_dev(name, dev);
 140                for (i = 0; i < MD_SB_DISKS && devname != NULL; i++) {
 141                        char *p;
 142                        char comp_name[64];
 143                        u32 rdev;
 144
 145                        p = strchr(devname, ',');
 146                        if (p)
 147                                *p++ = 0;
 148
 149                        dev = name_to_dev_t(devname);
 150                        if (strncmp(devname, "/dev/", 5) == 0)
 151                                devname += 5;
 152                        snprintf(comp_name, 63, "/dev/%s", devname);
 153                        rdev = bstat(comp_name);
 154                        if (rdev)
 155                                dev = new_decode_dev(rdev);
 156                        if (!dev) {
 157                                printk(KERN_WARNING "md: Unknown device name: %s\n", devname);
 158                                break;
 159                        }
 160
 161                        devices[i] = dev;
 162
 163                        devname = p;
 164                }
 165                devices[i] = 0;
 166
 167                if (!i)
 168                        continue;
 169
 170                printk(KERN_INFO "md: Loading md%s%d: %s\n",
 171                        partitioned ? "_d" : "", minor,
 172                        md_setup_args[ent].device_names);
 173
 174                fd = ksys_open(name, 0, 0);
 175                if (fd < 0) {
 176                        printk(KERN_ERR "md: open failed - cannot start "
 177                                        "array %s\n", name);
 178                        continue;
 179                }
 180                if (ksys_ioctl(fd, SET_ARRAY_INFO, 0) == -EBUSY) {
 181                        printk(KERN_WARNING
 182                               "md: Ignoring md=%d, already autodetected. (Use raid=noautodetect)\n",
 183                               minor);
 184                        ksys_close(fd);
 185                        continue;
 186                }
 187
 188                if (md_setup_args[ent].level != LEVEL_NONE) {
 189                        /* non-persistent */
 190                        mdu_array_info_t ainfo;
 191                        ainfo.level = md_setup_args[ent].level;
 192                        ainfo.size = 0;
 193                        ainfo.nr_disks =0;
 194                        ainfo.raid_disks =0;
 195                        while (devices[ainfo.raid_disks])
 196                                ainfo.raid_disks++;
 197                        ainfo.md_minor =minor;
 198                        ainfo.not_persistent = 1;
 199
 200                        ainfo.state = (1 << MD_SB_CLEAN);
 201                        ainfo.layout = 0;
 202                        ainfo.chunk_size = md_setup_args[ent].chunk;
 203                        err = ksys_ioctl(fd, SET_ARRAY_INFO, (long)&ainfo);
 204                        for (i = 0; !err && i <= MD_SB_DISKS; i++) {
 205                                dev = devices[i];
 206                                if (!dev)
 207                                        break;
 208                                dinfo.number = i;
 209                                dinfo.raid_disk = i;
 210                                dinfo.state = (1<<MD_DISK_ACTIVE)|(1<<MD_DISK_SYNC);
 211                                dinfo.major = MAJOR(dev);
 212                                dinfo.minor = MINOR(dev);
 213                                err = ksys_ioctl(fd, ADD_NEW_DISK,
 214                                                 (long)&dinfo);
 215                        }
 216                } else {
 217                        /* persistent */
 218                        for (i = 0; i <= MD_SB_DISKS; i++) {
 219                                dev = devices[i];
 220                                if (!dev)
 221                                        break;
 222                                dinfo.major = MAJOR(dev);
 223                                dinfo.minor = MINOR(dev);
 224                                ksys_ioctl(fd, ADD_NEW_DISK, (long)&dinfo);
 225                        }
 226                }
 227                if (!err)
 228                        err = ksys_ioctl(fd, RUN_ARRAY, 0);
 229                if (err)
 230                        printk(KERN_WARNING "md: starting md%d failed\n", minor);
 231                else {
 232                        /* reread the partition table.
 233                         * I (neilb) and not sure why this is needed, but I cannot
 234                         * boot a kernel with devfs compiled in from partitioned md
 235                         * array without it
 236                         */
 237                        ksys_close(fd);
 238                        fd = ksys_open(name, 0, 0);
 239                        ksys_ioctl(fd, BLKRRPART, 0);
 240                }
 241                ksys_close(fd);
 242        }
 243}
 244
 245static int __init raid_setup(char *str)
 246{
 247        int len, pos;
 248
 249        len = strlen(str) + 1;
 250        pos = 0;
 251
 252        while (pos < len) {
 253                char *comma = strchr(str+pos, ',');
 254                int wlen;
 255                if (comma)
 256                        wlen = (comma-str)-pos;
 257                else    wlen = (len-1)-pos;
 258
 259                if (!strncmp(str, "noautodetect", wlen))
 260                        raid_noautodetect = 1;
 261                if (!strncmp(str, "autodetect", wlen))
 262                        raid_noautodetect = 0;
 263                if (strncmp(str, "partitionable", wlen)==0)
 264                        raid_autopart = 1;
 265                if (strncmp(str, "part", wlen)==0)
 266                        raid_autopart = 1;
 267                pos += wlen+1;
 268        }
 269        return 1;
 270}
 271
 272__setup("raid=", raid_setup);
 273__setup("md=", md_setup);
 274
 275static void __init autodetect_raid(void)
 276{
 277        int fd;
 278
 279        /*
 280         * Since we don't want to detect and use half a raid array, we need to
 281         * wait for the known devices to complete their probing
 282         */
 283        printk(KERN_INFO "md: Waiting for all devices to be available before autodetect\n");
 284        printk(KERN_INFO "md: If you don't use raid, use raid=noautodetect\n");
 285
 286        wait_for_device_probe();
 287
 288        fd = ksys_open("/dev/md0", 0, 0);
 289        if (fd >= 0) {
 290                ksys_ioctl(fd, RAID_AUTORUN, raid_autopart);
 291                ksys_close(fd);
 292        }
 293}
 294
 295void __init md_run_setup(void)
 296{
 297        create_dev("/dev/md0", MKDEV(MD_MAJOR, 0));
 298
 299        if (raid_noautodetect)
 300                printk(KERN_INFO "md: Skipping autodetection of RAID arrays. (raid=autodetect will force)\n");
 301        else
 302                autodetect_raid();
 303        md_setup_drive();
 304}
 305