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;
  16
  17 static struct {
  18         char device_set [MAX_MD_DEVS];
  19         int pers[MAX_MD_DEVS];
  20         int chunk[MAX_MD_DEVS];
  21         char *device_names[MAX_MD_DEVS];
  22 } md_setup_args __initdata;
  23
  24 /*
  25  * Parse the command-line parameters given our kernel, but do not
  26  * actually try to invoke the MD device now; that is handled by
  27  * md_setup_drive after the low-level disk drivers have initialised.
  28  *
  29  * 27/11/1999: Fixed to work correctly with the 2.3 kernel (which
  30  *             assigns the task of parsing integer arguments to the
  31  *             invoked program now).  Added ability to initialise all
  32  *             the MD devices (by specifying multiple "md=" lines)
  33  *             instead of just one.  -- KTK
  34  * 18May2000: Added support for persistent-superblock arrays:
  35  *             md=n,0,factor,fault,device-list   uses RAID0 for device n
  36  *             md=n,-1,factor,fault,device-list  uses LINEAR for device n
  37  *             md=n,device-list      reads a RAID superblock from the devices
  38  *             elements in device-list are read by name_to_kdev_t so can be
  39  *             a hex number or something like /dev/hda1 /dev/sdb
  40  * 2001-06-03: Dave Cinege <dcinege@psychosis.com>
  41  *              Shifted name_to_kdev_t() and related operations to md_set_drive()
  42  *              for later execution. Rewrote section to make devfs compatible.
  43  */
  44 static int __init md_setup(char *str)
  45 {
  46         int minor, level, factor, fault, pers;
  47         char *pername = "";
  48         char *str1 = str;
  49
  50         if (get_option(&str, &minor) != 2) {    /* MD Number */
  51                 printk(KERN_WARNING "md: Too few arguments supplied to md=.\n");
  52                 return 0;
  53         }
  54         if (minor >= MAX_MD_DEVS) {
  55                 printk(KERN_WARNING "md: md=%d, Minor device number too high.\n", minor);
  56                 return 0;
  57         } else if (md_setup_args.device_names[minor]) {
  58                 printk(KERN_WARNING "md: md=%d, Specified more than once. "
  59                        "Replacing previous definition.\n", minor);
  60         }
  61         switch (get_option(&str, &level)) {     /* RAID Personality */
  62         case 2: /* could be 0 or -1.. */
  63                 if (level == 0 || level == LEVEL_LINEAR) {
  64                         if (get_option(&str, &factor) != 2 ||   /* Chunk Size */
  65                                         get_option(&str, &fault) != 2) {
  66                                 printk(KERN_WARNING "md: Too few arguments supplied to md=.\n");
  67                                 return 0;
  68                         }
  69                         md_setup_args.pers[minor] = level;
  70                         md_setup_args.chunk[minor] = 1 << (factor+12);
  71                         switch(level) {
  72                         case LEVEL_LINEAR:
  73                                 pers = LINEAR;
  74                                 pername = "linear";
  75                                 break;
  76                         case 0:
  77                                 pers = RAID0;
  78                                 pername = "raid0";
  79                                 break;
  80                         default:
  81                                 printk(KERN_WARNING
  82                                        "md: The kernel has not been configured for raid%d support!\n",
  83                                        level);
  84                                 return 0;
  85                         }
  86                         md_setup_args.pers[minor] = pers;
  87                         break;
  88                 }
  89                 /* FALL THROUGH */
  90         case 1: /* the first device is numeric */
  91                 str = str1;
  92                 /* FALL THROUGH */
  93         case 0:
  94                 md_setup_args.pers[minor] = 0;
  95                 pername="super-block";
  96         }
  97
  98         printk(KERN_INFO "md: Will configure md%d (%s) from %s, below.\n",
  99                 minor, pername, str);
 100         md_setup_args.device_names[minor] = str;
 101
 102         return 1;
 103 }
 104
 105 static void __init md_setup_drive(void)
 106 {
 107         int minor, i;
 108         dev_t dev;
 109         dev_t devices[MD_SB_DISKS+1];
 110
 111         for (minor = 0; minor < MAX_MD_DEVS; minor++) {
 112                 int fd;
 113                 int err = 0;
 114                 char *devname;
 115                 mdu_disk_info_t dinfo;
 116                 char name[16], devfs_name[16];
 117
 118                 if (!(devname = md_setup_args.device_names[minor]))
 119                         continue;
 120
 121                 sprintf(name, "/dev/md%d", minor);
 122                 sprintf(devfs_name, "/dev/md/%d", minor);
 123                 create_dev(name, MKDEV(MD_MAJOR, minor), devfs_name);
 124                 for (i = 0; i < MD_SB_DISKS && devname != 0; i++) {
 125                         char *p;
 126                         char comp_name[64];
 127                         struct stat buf;
 128
 129                         p = strchr(devname, ',');
 130                         if (p)
 131                                 *p++ = 0;
 132
 133                         dev = name_to_dev_t(devname);
 134                         if (strncmp(devname, "/dev/", 5) == 0)
 135                                 devname += 5;
 136                         snprintf(comp_name, 63, "/dev/%s", devname);
 137                         if (sys_newstat(comp_name, &buf) == 0 &&
 138                                                         S_ISBLK(buf.st_mode))
 139                                 dev = buf.st_rdev;
 140                         if (!dev) {
 141                                 printk(KERN_WARNING "md: Unknown device name: %s\n", devname);
 142                                 break;
 143                         }
 144
 145                         devices[i] = dev;
 146                         md_setup_args.device_set[minor] = 1;
 147
 148                         devname = p;
 149                 }
 150                 devices[i] = 0;
 151
 152                 if (!md_setup_args.device_set[minor])
 153                         continue;
 154
 155                 printk(KERN_INFO "md: Loading md%d: %s\n", minor, md_setup_args.device_names[minor]);
 156
 157                 fd = open(name, 0, 0);
 158                 if (fd < 0) {
 159                         printk(KERN_ERR "md: open failed - cannot start array %d\n", minor);
 160                         continue;
 161                 }
 162                 if (sys_ioctl(fd, SET_ARRAY_INFO, 0) == -EBUSY) {
 163                         printk(KERN_WARNING
 164                                "md: Ignoring md=%d, already autodetected. (Use raid=noautodetect)\n",
 165                                minor);
 166                         close(fd);
 167                         continue;
 168                 }
 169
 170                 if (md_setup_args.pers[minor]) {
 171                         /* non-persistent */
 172                         mdu_array_info_t ainfo;
 173                         ainfo.level = pers_to_level(md_setup_args.pers[minor]);
 174                         ainfo.size = 0;
 175                         ainfo.nr_disks =0;
 176                         ainfo.raid_disks =0;
 177                         while (devices[ainfo.raid_disks])
 178                                 ainfo.raid_disks++;
 179                         ainfo.md_minor =minor;
 180                         ainfo.not_persistent = 1;
 181
 182                         ainfo.state = (1 << MD_SB_CLEAN);
 183                         ainfo.layout = 0;
 184                         ainfo.chunk_size = md_setup_args.chunk[minor];
 185                         err = sys_ioctl(fd, SET_ARRAY_INFO, (long)&ainfo);
 186                         for (i = 0; !err && i <= MD_SB_DISKS; i++) {
 187                                 dev = devices[i];
 188                                 if (!dev)
 189                                         break;
 190                                 dinfo.number = i;
 191                                 dinfo.raid_disk = i;
 192                                 dinfo.state = (1<<MD_DISK_ACTIVE)|(1<<MD_DISK_SYNC);
 193                                 dinfo.major = MAJOR(dev);
 194                                 dinfo.minor = MINOR(dev);
 195                                 err = sys_ioctl(fd, ADD_NEW_DISK, (long)&dinfo);
 196                         }
 197                 } else {
 198                         /* persistent */
 199                         for (i = 0; i <= MD_SB_DISKS; i++) {
 200                                 dev = devices[i];
 201                                 if (!dev)
 202                                         break;
 203                                 dinfo.major = MAJOR(dev);
 204                                 dinfo.minor = MINOR(dev);
 205                                 sys_ioctl(fd, ADD_NEW_DISK, (long)&dinfo);
 206                         }
 207                 }
 208                 if (!err)
 209                         err = sys_ioctl(fd, RUN_ARRAY, 0);
 210                 if (err)
 211                         printk(KERN_WARNING "md: starting md%d failed\n", minor);
 212                 close(fd);
 213         }
 214 }
 215
 216 static int __init raid_setup(char *str)
 217 {
 218         int len, pos;
 219
 220         len = strlen(str) + 1;
 221         pos = 0;
 222
 223         while (pos < len) {
 224                 char *comma = strchr(str+pos, ',');
 225                 int wlen;
 226                 if (comma)
 227                         wlen = (comma-str)-pos;
 228                 else    wlen = (len-1)-pos;
 229
 230                 if (!strncmp(str, "noautodetect", wlen))
 231                         raid_noautodetect = 1;
 232                 pos += wlen+1;
 233         }
 234         return 1;
 235 }
 236
 237 __setup("raid=", raid_setup);
 238 __setup("md=", md_setup);
 239
 240 void __init md_run_setup(void)
 241 {
 242         create_dev("/dev/md0", MKDEV(MD_MAJOR, 0), "md/0");
 243         if (raid_noautodetect)
 244                 printk(KERN_INFO "md: Skipping autodetection of RAID arrays. (raid=noautodetect)\n");
 245         else {
 246                 int fd = open("/dev/md0", 0, 0);
 247                 if (fd >= 0) {
 248                         sys_ioctl(fd, RAID_AUTORUN, 0);
 249                         close(fd);
 250                 }
 251         }
 252         md_setup_drive();
 253 }