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