LXR linux/init/do_mounts

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