init/do_mounts_md.c

   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
  15 static int __initdata raid_noautodetect, raid_autopart;
  16
  17 static struct {
  18         int minor;
  19         int partitioned;
  20         int level;
  21         int chunk;
  22         char *device_names;
  23 } md_setup_args[256] __initdata;
  24
  25 static 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  */
  47 static 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
 112 static 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
 239 static 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
 267 void __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 }