init/do_mounts_md.c

   1 /*
   2  * Many of the syscalls used in this file expect some of the arguments
   3  * to be __user pointers not __kernel pointers.  To limit the sparse
   4  * noise, turn off sparse checking for this file.
   5  */
   6 #ifdef __CHECKER__
   7 #undef __CHECKER__
   8 #warning "Sparse checking disabled for this file"
   9 #endif
  10
  11 #include <linux/delay.h>
  12 #include <linux/raid/md_u.h>
  13 #include <linux/raid/md_p.h>
  14
  15 #include "do_mounts.h"
  16
  17 /*
  18  * When md (and any require personalities) are compiled into the kernel
  19  * (not a module), arrays can be assembles are boot time using with AUTODETECT
  20  * where specially marked partitions are registered with md_autodetect_dev(),
  21  * and with MD_BOOT where devices to be collected are given on the boot line
  22  * with md=.....
  23  * The code for that is here.
  24  */
  25
  26 #ifdef CONFIG_MD_AUTODETECT
  27 static int __initdata raid_noautodetect;
  28 #else
  29 static int __initdata raid_noautodetect=1;
  30 #endif
  31 static int __initdata raid_autopart;
  32
  33 static struct {
  34         int minor;
  35         int partitioned;
  36         int level;
  37         int chunk;
  38         char *device_names;
  39 } md_setup_args[256] __initdata;
  40
  41 static int md_setup_ents __initdata;
  42
  43 /*
  44  * Parse the command-line parameters given our kernel, but do not
  45  * actually try to invoke the MD device now; that is handled by
  46  * md_setup_drive after the low-level disk drivers have initialised.
  47  *
  48  * 27/11/1999: Fixed to work correctly with the 2.3 kernel (which
  49  *             assigns the task of parsing integer arguments to the
  50  *             invoked program now).  Added ability to initialise all
  51  *             the MD devices (by specifying multiple "md=" lines)
  52  *             instead of just one.  -- KTK
  53  * 18May2000: Added support for persistent-superblock arrays:
  54  *             md=n,0,factor,fault,device-list   uses RAID0 for device n
  55  *             md=n,-1,factor,fault,device-list  uses LINEAR for device n
  56  *             md=n,device-list      reads a RAID superblock from the devices
  57  *             elements in device-list are read by name_to_kdev_t so can be
  58  *             a hex number or something like /dev/hda1 /dev/sdb
  59  * 2001-06-03: Dave Cinege <dcinege@psychosis.com>
  60  *              Shifted name_to_kdev_t() and related operations to md_set_drive()
  61  *              for later execution. Rewrote section to make devfs compatible.
  62  */
  63 static int __init md_setup(char *str)
  64 {
  65         int minor, level, factor, fault, partitioned = 0;
  66         char *pername = "";
  67         char *str1;
  68         int ent;
  69
  70         if (*str == 'd') {
  71                 partitioned = 1;
  72                 str++;
  73         }
  74         if (get_option(&str, &minor) != 2) {    /* MD Number */
  75                 printk(KERN_WARNING "md: Too few arguments supplied to md=.\n");
  76                 return 0;
  77         }
  78         str1 = str;
  79         for (ent=0 ; ent< md_setup_ents ; ent++)
  80                 if (md_setup_args[ent].minor == minor &&
  81                     md_setup_args[ent].partitioned == partitioned) {
  82                         printk(KERN_WARNING "md: md=%s%d, Specified more than once. "
  83                                "Replacing previous definition.\n", partitioned?"d":"", minor);
  84                         break;
  85                 }
  86         if (ent >= ARRAY_SIZE(md_setup_args)) {
  87                 printk(KERN_WARNING "md: md=%s%d - too many md initialisations\n", partitioned?"d":"", minor);
  88                 return 0;
  89         }
  90         if (ent >= md_setup_ents)
  91                 md_setup_ents++;
  92         switch (get_option(&str, &level)) {     /* RAID level */
  93         case 2: /* could be 0 or -1.. */
  94                 if (level == 0 || level == LEVEL_LINEAR) {
  95                         if (get_option(&str, &factor) != 2 ||   /* Chunk Size */
  96                                         get_option(&str, &fault) != 2) {
  97                                 printk(KERN_WARNING "md: Too few arguments supplied to md=.\n");
  98                                 return 0;
  99                         }
 100                         md_setup_args[ent].level = level;
 101                         md_setup_args[ent].chunk = 1 << (factor+12);
 102                         if (level ==  LEVEL_LINEAR)
 103                                 pername = "linear";
 104                         else
 105                                 pername = "raid0";
 106                         break;
 107                 }
 108                 /* FALL THROUGH */
 109         case 1: /* the first device is numeric */
 110                 str = str1;
 111                 /* FALL THROUGH */
 112         case 0:
 113                 md_setup_args[ent].level = LEVEL_NONE;
 114                 pername="super-block";
 115         }
 116
 117         printk(KERN_INFO "md: Will configure md%d (%s) from %s, below.\n",
 118                 minor, pername, str);
 119         md_setup_args[ent].device_names = str;
 120         md_setup_args[ent].partitioned = partitioned;
 121         md_setup_args[ent].minor = minor;
 122
 123         return 1;
 124 }
 125
 126 static void __init md_setup_drive(void)
 127 {
 128         int minor, i, ent, partitioned;
 129         dev_t dev;
 130         dev_t devices[MD_SB_DISKS+1];
 131
 132         for (ent = 0; ent < md_setup_ents ; ent++) {
 133                 int fd;
 134                 int err = 0;
 135                 char *devname;
 136                 mdu_disk_info_t dinfo;
 137                 char name[16];
 138
 139                 minor = md_setup_args[ent].minor;
 140                 partitioned = md_setup_args[ent].partitioned;
 141                 devname = md_setup_args[ent].device_names;
 142
 143                 sprintf(name, "/dev/md%s%d", partitioned?"_d":"", minor);
 144                 if (partitioned)
 145                         dev = MKDEV(mdp_major, minor << MdpMinorShift);
 146                 else
 147                         dev = MKDEV(MD_MAJOR, minor);
 148                 create_dev(name, dev);
 149                 for (i = 0; i < MD_SB_DISKS && devname != NULL; i++) {
 150                         char *p;
 151                         char comp_name[64];
 152                         u32 rdev;
 153
 154                         p = strchr(devname, ',');
 155                         if (p)
 156                                 *p++ = 0;
 157
 158                         dev = name_to_dev_t(devname);
 159                         if (strncmp(devname, "/dev/", 5) == 0)
 160                                 devname += 5;
 161                         snprintf(comp_name, 63, "/dev/%s", devname);
 162                         rdev = bstat(comp_name);
 163                         if (rdev)
 164                                 dev = new_decode_dev(rdev);
 165                         if (!dev) {
 166                                 printk(KERN_WARNING "md: Unknown device name: %s\n", devname);
 167                                 break;
 168                         }
 169
 170                         devices[i] = dev;
 171
 172                         devname = p;
 173                 }
 174                 devices[i] = 0;
 175
 176                 if (!i)
 177                         continue;
 178
 179                 printk(KERN_INFO "md: Loading md%s%d: %s\n",
 180                         partitioned ? "_d" : "", minor,
 181                         md_setup_args[ent].device_names);
 182
 183                 fd = sys_open(name, 0, 0);
 184                 if (fd < 0) {
 185                         printk(KERN_ERR "md: open failed - cannot start "
 186                                         "array %s\n", name);
 187                         continue;
 188                 }
 189                 if (sys_ioctl(fd, SET_ARRAY_INFO, 0) == -EBUSY) {
 190                         printk(KERN_WARNING
 191                                "md: Ignoring md=%d, already autodetected. (Use raid=noautodetect)\n",
 192                                minor);
 193                         sys_close(fd);
 194                         continue;
 195                 }
 196
 197                 if (md_setup_args[ent].level != LEVEL_NONE) {
 198                         /* non-persistent */
 199                         mdu_array_info_t ainfo;
 200                         ainfo.level = md_setup_args[ent].level;
 201                         ainfo.size = 0;
 202                         ainfo.nr_disks =0;
 203                         ainfo.raid_disks =0;
 204                         while (devices[ainfo.raid_disks])
 205                                 ainfo.raid_disks++;
 206                         ainfo.md_minor =minor;
 207                         ainfo.not_persistent = 1;
 208
 209                         ainfo.state = (1 << MD_SB_CLEAN);
 210                         ainfo.layout = 0;
 211                         ainfo.chunk_size = md_setup_args[ent].chunk;
 212                         err = sys_ioctl(fd, SET_ARRAY_INFO, (long)&ainfo);
 213                         for (i = 0; !err && i <= MD_SB_DISKS; i++) {
 214                                 dev = devices[i];
 215                                 if (!dev)
 216                                         break;
 217                                 dinfo.number = i;
 218                                 dinfo.raid_disk = i;
 219                                 dinfo.state = (1<<MD_DISK_ACTIVE)|(1<<MD_DISK_SYNC);
 220                                 dinfo.major = MAJOR(dev);
 221                                 dinfo.minor = MINOR(dev);
 222                                 err = sys_ioctl(fd, ADD_NEW_DISK, (long)&dinfo);
 223                         }
 224                 } else {
 225                         /* persistent */
 226                         for (i = 0; i <= MD_SB_DISKS; i++) {
 227                                 dev = devices[i];
 228                                 if (!dev)
 229                                         break;
 230                                 dinfo.major = MAJOR(dev);
 231                                 dinfo.minor = MINOR(dev);
 232                                 sys_ioctl(fd, ADD_NEW_DISK, (long)&dinfo);
 233                         }
 234                 }
 235                 if (!err)
 236                         err = sys_ioctl(fd, RUN_ARRAY, 0);
 237                 if (err)
 238                         printk(KERN_WARNING "md: starting md%d failed\n", minor);
 239                 else {
 240                         /* reread the partition table.
 241                          * I (neilb) and not sure why this is needed, but I cannot
 242                          * boot a kernel with devfs compiled in from partitioned md
 243                          * array without it
 244                          */
 245                         sys_close(fd);
 246                         fd = sys_open(name, 0, 0);
 247                         sys_ioctl(fd, BLKRRPART, 0);
 248                 }
 249                 sys_close(fd);
 250         }
 251 }
 252
 253 static int __init raid_setup(char *str)
 254 {
 255         int len, pos;
 256
 257         len = strlen(str) + 1;
 258         pos = 0;
 259
 260         while (pos < len) {
 261                 char *comma = strchr(str+pos, ',');
 262                 int wlen;
 263                 if (comma)
 264                         wlen = (comma-str)-pos;
 265                 else    wlen = (len-1)-pos;
 266
 267                 if (!strncmp(str, "noautodetect", wlen))
 268                         raid_noautodetect = 1;
 269                 if (!strncmp(str, "autodetect", wlen))
 270                         raid_noautodetect = 0;
 271                 if (strncmp(str, "partitionable", wlen)==0)
 272                         raid_autopart = 1;
 273                 if (strncmp(str, "part", wlen)==0)
 274                         raid_autopart = 1;
 275                 pos += wlen+1;
 276         }
 277         return 1;
 278 }
 279
 280 __setup("raid=", raid_setup);
 281 __setup("md=", md_setup);
 282
 283 static void __init autodetect_raid(void)
 284 {
 285         int fd;
 286
 287         /*
 288          * Since we don't want to detect and use half a raid array, we need to
 289          * wait for the known devices to complete their probing
 290          */
 291         printk(KERN_INFO "md: Waiting for all devices to be available before autodetect\n");
 292         printk(KERN_INFO "md: If you don't use raid, use raid=noautodetect\n");
 293
 294         wait_for_device_probe();
 295
 296         fd = sys_open("/dev/md0", 0, 0);
 297         if (fd >= 0) {
 298                 sys_ioctl(fd, RAID_AUTORUN, raid_autopart);
 299                 sys_close(fd);
 300         }
 301 }
 302
 303 void __init md_run_setup(void)
 304 {
 305         create_dev("/dev/md0", MKDEV(MD_MAJOR, 0));
 306
 307         if (raid_noautodetect)
 308                 printk(KERN_INFO "md: Skipping autodetection of RAID arrays. (raid=autodetect will force)\n");
 309         else
 310                 autodetect_raid();
 311         md_setup_drive();
 312 }