init/do_mounts_md.c

   1
   2 #include <linux/raid/md.h>
   3 #include <linux/delay.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
  17 static int __initdata raid_noautodetect;
  18 #else
  19 static int __initdata raid_noautodetect=1;
  20 #endif
  21 static int __initdata raid_autopart;
  22
  23 static struct {
  24         int minor;
  25         int partitioned;
  26         int level;
  27         int chunk;
  28         char *device_names;
  29 } md_setup_args[256] __initdata;
  30
  31 static 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  */
  53 static 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
 116 #define MdpMinorShift 6
 117
 118 static void __init md_setup_drive(void)
 119 {
 120         int minor, i, ent, partitioned;
 121         dev_t dev;
 122         dev_t devices[MD_SB_DISKS+1];
 123
 124         for (ent = 0; ent < md_setup_ents ; ent++) {
 125                 int fd;
 126                 int err = 0;
 127                 char *devname;
 128                 mdu_disk_info_t dinfo;
 129                 char name[16];
 130
 131                 minor = md_setup_args[ent].minor;
 132                 partitioned = md_setup_args[ent].partitioned;
 133                 devname = md_setup_args[ent].device_names;
 134
 135                 sprintf(name, "/dev/md%s%d", partitioned?"_d":"", minor);
 136                 if (partitioned)
 137                         dev = MKDEV(mdp_major, minor << MdpMinorShift);
 138                 else
 139                         dev = MKDEV(MD_MAJOR, minor);
 140                 create_dev(name, dev);
 141                 for (i = 0; i < MD_SB_DISKS && devname != NULL; i++) {
 142                         char *p;
 143                         char comp_name[64];
 144                         u32 rdev;
 145
 146                         p = strchr(devname, ',');
 147                         if (p)
 148                                 *p++ = 0;
 149
 150                         dev = name_to_dev_t(devname);
 151                         if (strncmp(devname, "/dev/", 5) == 0)
 152                                 devname += 5;
 153                         snprintf(comp_name, 63, "/dev/%s", devname);
 154                         rdev = bstat(comp_name);
 155                         if (rdev)
 156                                 dev = new_decode_dev(rdev);
 157                         if (!dev) {
 158                                 printk(KERN_WARNING "md: Unknown device name: %s\n", devname);
 159                                 break;
 160                         }
 161
 162                         devices[i] = dev;
 163
 164                         devname = p;
 165                 }
 166                 devices[i] = 0;
 167
 168                 if (!i)
 169                         continue;
 170
 171                 printk(KERN_INFO "md: Loading md%s%d: %s\n",
 172                         partitioned ? "_d" : "", minor,
 173                         md_setup_args[ent].device_names);
 174
 175                 fd = sys_open(name, 0, 0);
 176                 if (fd < 0) {
 177                         printk(KERN_ERR "md: open failed - cannot start "
 178                                         "array %s\n", name);
 179                         continue;
 180                 }
 181                 if (sys_ioctl(fd, SET_ARRAY_INFO, 0) == -EBUSY) {
 182                         printk(KERN_WARNING
 183                                "md: Ignoring md=%d, already autodetected. (Use raid=noautodetect)\n",
 184                                minor);
 185                         sys_close(fd);
 186                         continue;
 187                 }
 188
 189                 if (md_setup_args[ent].level != LEVEL_NONE) {
 190                         /* non-persistent */
 191                         mdu_array_info_t ainfo;
 192                         ainfo.level = md_setup_args[ent].level;
 193                         ainfo.size = 0;
 194                         ainfo.nr_disks =0;
 195                         ainfo.raid_disks =0;
 196                         while (devices[ainfo.raid_disks])
 197                                 ainfo.raid_disks++;
 198                         ainfo.md_minor =minor;
 199                         ainfo.not_persistent = 1;
 200
 201                         ainfo.state = (1 << MD_SB_CLEAN);
 202                         ainfo.layout = 0;
 203                         ainfo.chunk_size = md_setup_args[ent].chunk;
 204                         err = sys_ioctl(fd, SET_ARRAY_INFO, (long)&ainfo);
 205                         for (i = 0; !err && i <= MD_SB_DISKS; i++) {
 206                                 dev = devices[i];
 207                                 if (!dev)
 208                                         break;
 209                                 dinfo.number = i;
 210                                 dinfo.raid_disk = i;
 211                                 dinfo.state = (1<<MD_DISK_ACTIVE)|(1<<MD_DISK_SYNC);
 212                                 dinfo.major = MAJOR(dev);
 213                                 dinfo.minor = MINOR(dev);
 214                                 err = sys_ioctl(fd, ADD_NEW_DISK, (long)&dinfo);
 215                         }
 216                 } else {
 217                         /* persistent */
 218                         for (i = 0; i <= MD_SB_DISKS; i++) {
 219                                 dev = devices[i];
 220                                 if (!dev)
 221                                         break;
 222                                 dinfo.major = MAJOR(dev);
 223                                 dinfo.minor = MINOR(dev);
 224                                 sys_ioctl(fd, ADD_NEW_DISK, (long)&dinfo);
 225                         }
 226                 }
 227                 if (!err)
 228                         err = sys_ioctl(fd, RUN_ARRAY, 0);
 229                 if (err)
 230                         printk(KERN_WARNING "md: starting md%d failed\n", minor);
 231                 else {
 232                         /* reread the partition table.
 233                          * I (neilb) and not sure why this is needed, but I cannot
 234                          * boot a kernel with devfs compiled in from partitioned md
 235                          * array without it
 236                          */
 237                         sys_close(fd);
 238                         fd = sys_open(name, 0, 0);
 239                         sys_ioctl(fd, BLKRRPART, 0);
 240                 }
 241                 sys_close(fd);
 242         }
 243 }
 244
 245 static int __init raid_setup(char *str)
 246 {
 247         int len, pos;
 248
 249         len = strlen(str) + 1;
 250         pos = 0;
 251
 252         while (pos < len) {
 253                 char *comma = strchr(str+pos, ',');
 254                 int wlen;
 255                 if (comma)
 256                         wlen = (comma-str)-pos;
 257                 else    wlen = (len-1)-pos;
 258
 259                 if (!strncmp(str, "noautodetect", wlen))
 260                         raid_noautodetect = 1;
 261                 if (!strncmp(str, "autodetect", wlen))
 262                         raid_noautodetect = 0;
 263                 if (strncmp(str, "partitionable", wlen)==0)
 264                         raid_autopart = 1;
 265                 if (strncmp(str, "part", wlen)==0)
 266                         raid_autopart = 1;
 267                 pos += wlen+1;
 268         }
 269         return 1;
 270 }
 271
 272 __setup("raid=", raid_setup);
 273 __setup("md=", md_setup);
 274
 275 static void autodetect_raid(void)
 276 {
 277         int fd;
 278
 279         /*
 280          * Since we don't want to detect and use half a raid array, we need to
 281          * wait for the known devices to complete their probing
 282          */
 283         printk(KERN_INFO "md: Waiting for all devices to be available before autodetect\n");
 284         printk(KERN_INFO "md: If you don't use raid, use raid=noautodetect\n");
 285         while (driver_probe_done() < 0)
 286                 msleep(100);
 287         fd = sys_open("/dev/md0", 0, 0);
 288         if (fd >= 0) {
 289                 sys_ioctl(fd, RAID_AUTORUN, raid_autopart);
 290                 sys_close(fd);
 291         }
 292 }
 293
 294 void __init md_run_setup(void)
 295 {
 296         create_dev("/dev/md0", MKDEV(MD_MAJOR, 0));
 297
 298         if (raid_noautodetect)
 299                 printk(KERN_INFO "md: Skipping autodetection of RAID arrays. (raid=autodetect will force)\n");
 300         else
 301                 autodetect_raid();
 302         md_setup_drive();
 303 }