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