LXR RHEL4/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 pers;
  21        int chunk;
  22        char *device_names;
  23} md_setup_args[MAX_MD_DEVS] __initdata;
  24
  25static int md_setup_ents __initdata;
  26
  27extern int mdp_major;
  28/*
  29 * Parse the command-line parameters given our kernel, but do not
  30 * actually try to invoke the MD device now; that is handled by
  31 * md_setup_drive after the low-level disk drivers have initialised.
  32 *
  33 * 27/11/1999: Fixed to work correctly with the 2.3 kernel (which
  34 *             assigns the task of parsing integer arguments to the
  35 *             invoked program now).  Added ability to initialise all
  36 *             the MD devices (by specifying multiple "md=" lines)
  37 *             instead of just one.  -- KTK
  38 * 18May2000: Added support for persistent-superblock arrays:
  39 *             md=n,0,factor,fault,device-list   uses RAID0 for device n
  40 *             md=n,-1,factor,fault,device-list  uses LINEAR for device n
  41 *             md=n,device-list      reads a RAID superblock from the devices
  42 *             elements in device-list are read by name_to_kdev_t so can be
  43 *             a hex number or something like /dev/hda1 /dev/sdb
  44 * 2001-06-03: Dave Cinege <dcinege@psychosis.com>
  45 *              Shifted name_to_kdev_t() and related operations to md_set_drive()
  46 *              for later execution. Rewrote section to make devfs compatible.
  47 */
  48static int __init md_setup(char *str)
  49{
  50        int minor, level, factor, fault, pers, partitioned = 0;
  51        char *pername = "";
  52        char *str1;
  53        int ent;
  54
  55        if (*str == 'd') {
  56                partitioned = 1;
  57                str++;
  58        }
  59        if (get_option(&str, &minor) != 2) {    /* MD Number */
  60                printk(KERN_WARNING "md: Too few arguments supplied to md=.\n");
  61                return 0;
  62        }
  63        str1 = str;
  64        if (minor >= MAX_MD_DEVS) {
  65                printk(KERN_WARNING "md: md=%d, Minor device number too high.\n", minor);
  66                return 0;
  67        }
  68        for (ent=0 ; ent< md_setup_ents ; ent++)
  69                if (md_setup_args[ent].minor == minor &&
  70                    md_setup_args[ent].partitioned == partitioned) {
  71                        printk(KERN_WARNING "md: md=%s%d, Specified more than once. "
  72                               "Replacing previous definition.\n", partitioned?"d":"", minor);
  73                        break;
  74                }
  75        if (ent >= MAX_MD_DEVS) {
  76                printk(KERN_WARNING "md: md=%s%d - too many md initialisations\n", partitioned?"d":"", minor);
  77                return 0;
  78        }
  79        if (ent >= md_setup_ents)
  80                md_setup_ents++;
  81        switch (get_option(&str, &level)) {     /* RAID Personality */
  82        case 2: /* could be 0 or -1.. */
  83                if (level == 0 || level == LEVEL_LINEAR) {
  84                        if (get_option(&str, &factor) != 2 ||   /* Chunk Size */
  85                                        get_option(&str, &fault) != 2) {
  86                                printk(KERN_WARNING "md: Too few arguments supplied to md=.\n");
  87                                return 0;
  88                        }
  89                        md_setup_args[ent].pers = level;
  90                        md_setup_args[ent].chunk = 1 << (factor+12);
  91                        if (level ==  LEVEL_LINEAR) {
  92                                pers = LINEAR;
  93                                pername = "linear";
  94                        } else {
  95                                pers = RAID0;
  96                                pername = "raid0";
  97                        }
  98                        md_setup_args[ent].pers = pers;
  99                        break;
 100                }
 101                /* FALL THROUGH */
 102        case 1: /* the first device is numeric */
 103                str = str1;
 104                /* FALL THROUGH */
 105        case 0:
 106                md_setup_args[ent].pers = 0;
 107                pername="super-block";
 108        }
 109
 110        printk(KERN_INFO "md: Will configure md%d (%s) from %s, below.\n",
 111                minor, pername, str);
 112        md_setup_args[ent].device_names = str;
 113        md_setup_args[ent].partitioned = partitioned;
 114        md_setup_args[ent].minor = minor;
 115
 116        return 1;
 117}
 118
 119#define MdpMinorShift 6
 120
 121static void __init md_setup_drive(void)
 122{
 123        int minor, i, ent, partitioned;
 124        dev_t dev;
 125        dev_t devices[MD_SB_DISKS+1];
 126
 127        for (ent = 0; ent < md_setup_ents ; ent++) {
 128                int fd;
 129                int err = 0;
 130                char *devname;
 131                mdu_disk_info_t dinfo;
 132                char name[16], devfs_name[16];
 133
 134                minor = md_setup_args[ent].minor;
 135                partitioned = md_setup_args[ent].partitioned;
 136                devname = md_setup_args[ent].device_names;
 137
 138                sprintf(name, "/dev/md%s%d", partitioned?"_d":"", minor);
 139                sprintf(devfs_name, "/dev/md/%s%d", partitioned?"d":"", minor);
 140                if (partitioned)
 141                        dev = MKDEV(mdp_major, minor << MdpMinorShift);
 142                else
 143                        dev = MKDEV(MD_MAJOR, minor);
 144                create_dev(name, dev, devfs_name);
 145                for (i = 0; i < MD_SB_DISKS && devname != 0; i++) {
 146                        char *p;
 147                        char comp_name[64];
 148                        u32 rdev;
 149
 150                        p = strchr(devname, ',');
 151                        if (p)
 152                                *p++ = 0;
 153
 154                        dev = name_to_dev_t(devname);
 155                        if (strncmp(devname, "/dev/", 5) == 0)
 156                                devname += 5;
 157                        snprintf(comp_name, 63, "/dev/%s", devname);
 158                        rdev = bstat(comp_name);
 159                        if (rdev)
 160                                dev = new_decode_dev(rdev);
 161                        if (!dev) {
 162                                printk(KERN_WARNING "md: Unknown device name: %s\n", devname);
 163                                break;
 164                        }
 165
 166                        devices[i] = dev;
 167
 168                        devname = p;
 169                }
 170                devices[i] = 0;
 171
 172                if (!i)
 173                        continue;
 174
 175                printk(KERN_INFO "md: Loading md%s%d: %s\n",
 176                        partitioned ? "_d" : "", minor,
 177                        md_setup_args[ent].device_names);
 178
 179                fd = sys_open(name, 0, 0);
 180                if (fd < 0) {
 181                        printk(KERN_ERR "md: open failed - cannot start "
 182                                        "array %s\n", name);
 183                        continue;
 184                }
 185                if (sys_ioctl(fd, SET_ARRAY_INFO, 0) == -EBUSY) {
 186                        printk(KERN_WARNING
 187                               "md: Ignoring md=%d, already autodetected. (Use raid=noautodetect)\n",
 188                               minor);
 189                        sys_close(fd);
 190                        continue;
 191                }
 192
 193                if (md_setup_args[ent].pers) {
 194                        /* non-persistent */
 195                        mdu_array_info_t ainfo;
 196                        ainfo.level = pers_to_level(md_setup_args[ent].pers);
 197                        ainfo.size = 0;
 198                        ainfo.nr_disks =0;
 199                        ainfo.raid_disks =0;
 200                        while (devices[ainfo.raid_disks])
 201                                ainfo.raid_disks++;
 202                        ainfo.md_minor =minor;
 203                        ainfo.not_persistent = 1;
 204
 205                        ainfo.state = (1 << MD_SB_CLEAN);
 206                        ainfo.layout = 0;
 207                        ainfo.chunk_size = md_setup_args[ent].chunk;
 208                        err = sys_ioctl(fd, SET_ARRAY_INFO, (long)&ainfo);
 209                        for (i = 0; !err && i <= MD_SB_DISKS; i++) {
 210                                dev = devices[i];
 211                                if (!dev)
 212                                        break;
 213                                dinfo.number = i;
 214                                dinfo.raid_disk = i;
 215                                dinfo.state = (1<<MD_DISK_ACTIVE)|(1<<MD_DISK_SYNC);
 216                                dinfo.major = MAJOR(dev);
 217                                dinfo.minor = MINOR(dev);
 218                                err = sys_ioctl(fd, ADD_NEW_DISK, (long)&dinfo);
 219                        }
 220                } else {
 221                        /* persistent */
 222                        for (i = 0; i <= MD_SB_DISKS; i++) {
 223                                dev = devices[i];
 224                                if (!dev)
 225                                        break;
 226                                dinfo.major = MAJOR(dev);
 227                                dinfo.minor = MINOR(dev);
 228                                sys_ioctl(fd, ADD_NEW_DISK, (long)&dinfo);
 229                        }
 230                }
 231                if (!err)
 232                        err = sys_ioctl(fd, RUN_ARRAY, 0);
 233                if (err)
 234                        printk(KERN_WARNING "md: starting md%d failed\n", minor);
 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), "md/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