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 extern 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  */
  48 static int __init md_setup(char *str)
  49 {
  50         int minor, level, factor, fault, 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         for (ent=0 ; ent< md_setup_ents ; ent++)
  65                 if (md_setup_args[ent].minor == minor &&
  66                     md_setup_args[ent].partitioned == partitioned) {
  67                         printk(KERN_WARNING "md: md=%s%d, Specified more than once. "
  68                                "Replacing previous definition.\n", partitioned?"d":"", minor);
  69                         break;
  70                 }
  71         if (ent >= ARRAY_SIZE(md_setup_args)) {
  72                 printk(KERN_WARNING "md: md=%s%d - too many md initialisations\n", partitioned?"d":"", minor);
  73                 return 0;
  74         }
  75         if (ent >= md_setup_ents)
  76                 md_setup_ents++;
  77         switch (get_option(&str, &level)) {     /* RAID level */
  78         case 2: /* could be 0 or -1.. */
  79                 if (level == 0 || level == LEVEL_LINEAR) {
  80                         if (get_option(&str, &factor) != 2 ||   /* Chunk Size */
  81                                         get_option(&str, &fault) != 2) {
  82                                 printk(KERN_WARNING "md: Too few arguments supplied to md=.\n");
  83                                 return 0;
  84                         }
  85                         md_setup_args[ent].level = level;
  86                         md_setup_args[ent].chunk = 1 << (factor+12);
  87                         if (level ==  LEVEL_LINEAR)
  88                                 pername = "linear";
  89                         else
  90                                 pername = "raid0";
  91                         break;
  92                 }
  93                 /* FALL THROUGH */
  94         case 1: /* the first device is numeric */
  95                 str = str1;
  96                 /* FALL THROUGH */
  97         case 0:
  98                 md_setup_args[ent].level = LEVEL_NONE;
  99                 pername="super-block";
 100         }
 101
 102         printk(KERN_INFO "md: Will configure md%d (%s) from %s, below.\n",
 103                 minor, pername, str);
 104         md_setup_args[ent].device_names = str;
 105         md_setup_args[ent].partitioned = partitioned;
 106         md_setup_args[ent].minor = minor;
 107
 108         return 1;
 109 }
 110
 111 #define MdpMinorShift 6
 112
 113 static void __init md_setup_drive(void)
 114 {
 115         int minor, i, ent, partitioned;
 116         dev_t dev;
 117         dev_t devices[MD_SB_DISKS+1];
 118
 119         for (ent = 0; ent < md_setup_ents ; ent++) {
 120                 int fd;
 121                 int err = 0;
 122                 char *devname;
 123                 mdu_disk_info_t dinfo;
 124                 char name[16];
 125
 126                 minor = md_setup_args[ent].minor;
 127                 partitioned = md_setup_args[ent].partitioned;
 128                 devname = md_setup_args[ent].device_names;
 129
 130                 sprintf(name, "/dev/md%s%d", partitioned?"_d":"", minor);
 131                 if (partitioned)
 132                         dev = MKDEV(mdp_major, minor << MdpMinorShift);
 133                 else
 134                         dev = MKDEV(MD_MAJOR, minor);
 135                 create_dev(name, dev);
 136                 for (i = 0; i < MD_SB_DISKS && devname != NULL; i++) {
 137                         char *p;
 138                         char comp_name[64];
 139                         u32 rdev;
 140
 141                         p = strchr(devname, ',');
 142                         if (p)
 143                                 *p++ = 0;
 144
 145                         dev = name_to_dev_t(devname);
 146                         if (strncmp(devname, "/dev/", 5) == 0)
 147                                 devname += 5;
 148                         snprintf(comp_name, 63, "/dev/%s", devname);
 149                         rdev = bstat(comp_name);
 150                         if (rdev)
 151                                 dev = new_decode_dev(rdev);
 152                         if (!dev) {
 153                                 printk(KERN_WARNING "md: Unknown device name: %s\n", devname);
 154                                 break;
 155                         }
 156
 157                         devices[i] = dev;
 158
 159                         devname = p;
 160                 }
 161                 devices[i] = 0;
 162
 163                 if (!i)
 164                         continue;
 165
 166                 printk(KERN_INFO "md: Loading md%s%d: %s\n",
 167                         partitioned ? "_d" : "", minor,
 168                         md_setup_args[ent].device_names);
 169
 170                 fd = sys_open(name, 0, 0);
 171                 if (fd < 0) {
 172                         printk(KERN_ERR "md: open failed - cannot start "
 173                                         "array %s\n", name);
 174                         continue;
 175                 }
 176                 if (sys_ioctl(fd, SET_ARRAY_INFO, 0) == -EBUSY) {
 177                         printk(KERN_WARNING
 178                                "md: Ignoring md=%d, already autodetected. (Use raid=noautodetect)\n",
 179                                minor);
 180                         sys_close(fd);
 181                         continue;
 182                 }
 183
 184                 if (md_setup_args[ent].level != LEVEL_NONE) {
 185                         /* non-persistent */
 186                         mdu_array_info_t ainfo;
 187                         ainfo.level = md_setup_args[ent].level;
 188                         ainfo.size = 0;
 189                         ainfo.nr_disks =0;
 190                         ainfo.raid_disks =0;
 191                         while (devices[ainfo.raid_disks])
 192                                 ainfo.raid_disks++;
 193                         ainfo.md_minor =minor;
 194                         ainfo.not_persistent = 1;
 195
 196                         ainfo.state = (1 << MD_SB_CLEAN);
 197                         ainfo.layout = 0;
 198                         ainfo.chunk_size = md_setup_args[ent].chunk;
 199                         err = sys_ioctl(fd, SET_ARRAY_INFO, (long)&ainfo);
 200                         for (i = 0; !err && i <= MD_SB_DISKS; i++) {
 201                                 dev = devices[i];
 202                                 if (!dev)
 203                                         break;
 204                                 dinfo.number = i;
 205                                 dinfo.raid_disk = i;
 206                                 dinfo.state = (1<<MD_DISK_ACTIVE)|(1<<MD_DISK_SYNC);
 207                                 dinfo.major = MAJOR(dev);
 208                                 dinfo.minor = MINOR(dev);
 209                                 err = sys_ioctl(fd, ADD_NEW_DISK, (long)&dinfo);
 210                         }
 211                 } else {
 212                         /* persistent */
 213                         for (i = 0; i <= MD_SB_DISKS; i++) {
 214                                 dev = devices[i];
 215                                 if (!dev)
 216                                         break;
 217                                 dinfo.major = MAJOR(dev);
 218                                 dinfo.minor = MINOR(dev);
 219                                 sys_ioctl(fd, ADD_NEW_DISK, (long)&dinfo);
 220                         }
 221                 }
 222                 if (!err)
 223                         err = sys_ioctl(fd, RUN_ARRAY, 0);
 224                 if (err)
 225                         printk(KERN_WARNING "md: starting md%d failed\n", minor);
 226                 else {
 227                         /* reread the partition table.
 228                          * I (neilb) and not sure why this is needed, but I cannot
 229                          * boot a kernel with devfs compiled in from partitioned md
 230                          * array without it
 231                          */
 232                         sys_close(fd);
 233                         fd = sys_open(name, 0, 0);
 234                         sys_ioctl(fd, BLKRRPART, 0);
 235                 }
 236                 sys_close(fd);
 237         }
 238 }
 239
 240 static int __init raid_setup(char *str)
 241 {
 242         int len, pos;
 243
 244         len = strlen(str) + 1;
 245         pos = 0;
 246
 247         while (pos < len) {
 248                 char *comma = strchr(str+pos, ',');
 249                 int wlen;
 250                 if (comma)
 251                         wlen = (comma-str)-pos;
 252                 else    wlen = (len-1)-pos;
 253
 254                 if (!strncmp(str, "noautodetect", wlen))
 255                         raid_noautodetect = 1;
 256                 if (strncmp(str, "partitionable", wlen)==0)
 257                         raid_autopart = 1;
 258                 if (strncmp(str, "part", wlen)==0)
 259                         raid_autopart = 1;
 260                 pos += wlen+1;
 261         }
 262         return 1;
 263 }
 264
 265 __setup("raid=", raid_setup);
 266 __setup("md=", md_setup);
 267
 268 void __init md_run_setup(void)
 269 {
 270         create_dev("/dev/md0", MKDEV(MD_MAJOR, 0));
 271         if (raid_noautodetect)
 272                 printk(KERN_INFO "md: Skipping autodetection of RAID arrays. (raid=noautodetect)\n");
 273         else {
 274                 int fd = sys_open("/dev/md0", 0, 0);
 275                 if (fd >= 0) {
 276                         sys_ioctl(fd, RAID_AUTORUN, raid_autopart);
 277                         sys_close(fd);
 278                 }
 279         }
 280         md_setup_drive();
 281 }