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 pers;
  21         int chunk;
  22         char *device_names;
  23 } md_setup_args[MAX_MD_DEVS] __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, 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
 121 static 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                 else {
 236                         /* reread the partition table.
 237                          * I (neilb) and not sure why this is needed, but I cannot
 238                          * boot a kernel with devfs compiled in from partitioned md
 239                          * array without it
 240                          */
 241                         sys_close(fd);
 242                         fd = sys_open(name, 0, 0);
 243                         sys_ioctl(fd, BLKRRPART, 0);
 244                 }
 245                 sys_close(fd);
 246         }
 247 }
 248
 249 static int __init raid_setup(char *str)
 250 {
 251         int len, pos;
 252
 253         len = strlen(str) + 1;
 254         pos = 0;
 255
 256         while (pos < len) {
 257                 char *comma = strchr(str+pos, ',');
 258                 int wlen;
 259                 if (comma)
 260                         wlen = (comma-str)-pos;
 261                 else    wlen = (len-1)-pos;
 262
 263                 if (!strncmp(str, "noautodetect", wlen))
 264                         raid_noautodetect = 1;
 265                 if (strncmp(str, "partitionable", wlen)==0)
 266                         raid_autopart = 1;
 267                 if (strncmp(str, "part", wlen)==0)
 268                         raid_autopart = 1;
 269                 pos += wlen+1;
 270         }
 271         return 1;
 272 }
 273
 274 __setup("raid=", raid_setup);
 275 __setup("md=", md_setup);
 276
 277 void __init md_run_setup(void)
 278 {
 279         create_dev("/dev/md0", MKDEV(MD_MAJOR, 0), "md/0");
 280         if (raid_noautodetect)
 281                 printk(KERN_INFO "md: Skipping autodetection of RAID arrays. (raid=noautodetect)\n");
 282         else {
 283                 int fd = sys_open("/dev/md0", 0, 0);
 284                 if (fd >= 0) {
 285                         sys_ioctl(fd, RAID_AUTORUN, raid_autopart);
 286                         sys_close(fd);
 287                 }
 288         }
 289         md_setup_drive();
 290 }