init/do_mounts_md.c

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