1 #include <linux/delay.h>
2 #include <linux/raid/md.h>
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
12 * The code for that is here.
15 #ifdef CONFIG_MD_AUTODETECT
16 static int __initdata raid_noautodetect;
18 static int __initdata raid_noautodetect=1;
20 static int __initdata raid_autopart;
28 } md_setup_args[256] __initdata;
30 static int md_setup_ents __initdata;
33 * Parse the command-line parameters given our kernel, but do not
34 * actually try to invoke the MD device now; that is handled by
35 * md_setup_drive after the low-level disk drivers have initialised.
37 * 27/11/1999: Fixed to work correctly with the 2.3 kernel (which
38 * assigns the task of parsing integer arguments to the
39 * invoked program now). Added ability to initialise all
40 * the MD devices (by specifying multiple "md=" lines)
41 * instead of just one. -- KTK
42 * 18May2000: Added support for persistent-superblock arrays:
43 * md=n,0,factor,fault,device-list uses RAID0 for device n
44 * md=n,-1,factor,fault,device-list uses LINEAR for device n
45 * md=n,device-list reads a RAID superblock from the devices
46 * elements in device-list are read by name_to_kdev_t so can be
47 * a hex number or something like /dev/hda1 /dev/sdb
48 * 2001-06-03: Dave Cinege <dcinege@psychosis.com>
49 * Shifted name_to_kdev_t() and related operations to md_set_drive()
50 * for later execution. Rewrote section to make devfs compatible.
52 static int __init md_setup(char *str)
54 int minor, level, factor, fault, partitioned = 0;
63 if (get_option(&str, &minor) != 2) { /* MD Number */
64 printk(KERN_WARNING "md: Too few arguments supplied to md=.\n");
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);
75 if (ent >= ARRAY_SIZE(md_setup_args)) {
76 printk(KERN_WARNING "md: md=%s%d - too many md initialisations\n", partitioned?"d":"", minor);
79 if (ent >= md_setup_ents)
81 switch (get_option(&str, &level)) { /* RAID level */
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");
89 md_setup_args[ent].level = level;
90 md_setup_args[ent].chunk = 1 << (factor+12);
91 if (level == LEVEL_LINEAR)
98 case 1: /* the first device is numeric */
102 md_setup_args[ent].level = LEVEL_NONE;
103 pername="super-block";
106 printk(KERN_INFO "md: Will configure md%d (%s) from %s, below.\n",
107 minor, pername, str);
108 md_setup_args[ent].device_names = str;
109 md_setup_args[ent].partitioned = partitioned;
110 md_setup_args[ent].minor = minor;
115 static void __init md_setup_drive(void)
117 int minor, i, ent, partitioned;
119 dev_t devices[MD_SB_DISKS+1];
121 for (ent = 0; ent < md_setup_ents ; ent++) {
125 mdu_disk_info_t dinfo;
128 minor = md_setup_args[ent].minor;
129 partitioned = md_setup_args[ent].partitioned;
130 devname = md_setup_args[ent].device_names;
132 sprintf(name, "/dev/md%s%d", partitioned?"_d":"", minor);
134 dev = MKDEV(mdp_major, minor << MdpMinorShift);
136 dev = MKDEV(MD_MAJOR, minor);
137 create_dev(name, dev);
138 for (i = 0; i < MD_SB_DISKS && devname != NULL; i++) {
143 p = strchr(devname, ',');
147 dev = name_to_dev_t(devname);
148 if (strncmp(devname, "/dev/", 5) == 0)
150 snprintf(comp_name, 63, "/dev/%s", devname);
151 rdev = bstat(comp_name);
153 dev = new_decode_dev(rdev);
155 printk(KERN_WARNING "md: Unknown device name: %s\n", devname);
168 printk(KERN_INFO "md: Loading md%s%d: %s\n",
169 partitioned ? "_d" : "", minor,
170 md_setup_args[ent].device_names);
172 fd = sys_open(name, 0, 0);
174 printk(KERN_ERR "md: open failed - cannot start "
178 if (sys_ioctl(fd, SET_ARRAY_INFO, 0) == -EBUSY) {
180 "md: Ignoring md=%d, already autodetected. (Use raid=noautodetect)\n",
186 if (md_setup_args[ent].level != LEVEL_NONE) {
188 mdu_array_info_t ainfo;
189 ainfo.level = md_setup_args[ent].level;
193 while (devices[ainfo.raid_disks])
195 ainfo.md_minor =minor;
196 ainfo.not_persistent = 1;
198 ainfo.state = (1 << MD_SB_CLEAN);
200 ainfo.chunk_size = md_setup_args[ent].chunk;
201 err = sys_ioctl(fd, SET_ARRAY_INFO, (long)&ainfo);
202 for (i = 0; !err && i <= MD_SB_DISKS; i++) {
208 dinfo.state = (1<<MD_DISK_ACTIVE)|(1<<MD_DISK_SYNC);
209 dinfo.major = MAJOR(dev);
210 dinfo.minor = MINOR(dev);
211 err = sys_ioctl(fd, ADD_NEW_DISK, (long)&dinfo);
215 for (i = 0; i <= MD_SB_DISKS; i++) {
219 dinfo.major = MAJOR(dev);
220 dinfo.minor = MINOR(dev);
221 sys_ioctl(fd, ADD_NEW_DISK, (long)&dinfo);
225 err = sys_ioctl(fd, RUN_ARRAY, 0);
227 printk(KERN_WARNING "md: starting md%d failed\n", minor);
229 /* reread the partition table.
230 * I (neilb) and not sure why this is needed, but I cannot
231 * boot a kernel with devfs compiled in from partitioned md
235 fd = sys_open(name, 0, 0);
236 sys_ioctl(fd, BLKRRPART, 0);
242 static int __init raid_setup(char *str)
246 len = strlen(str) + 1;
250 char *comma = strchr(str+pos, ',');
253 wlen = (comma-str)-pos;
254 else wlen = (len-1)-pos;
256 if (!strncmp(str, "noautodetect", wlen))
257 raid_noautodetect = 1;
258 if (!strncmp(str, "autodetect", wlen))
259 raid_noautodetect = 0;
260 if (strncmp(str, "partitionable", wlen)==0)
262 if (strncmp(str, "part", wlen)==0)
269 __setup("raid=", raid_setup);
270 __setup("md=", md_setup);
272 static void __init autodetect_raid(void)
277 * Since we don't want to detect and use half a raid array, we need to
278 * wait for the known devices to complete their probing
280 printk(KERN_INFO "md: Waiting for all devices to be available before autodetect\n");
281 printk(KERN_INFO "md: If you don't use raid, use raid=noautodetect\n");
283 wait_for_device_probe();
285 fd = sys_open("/dev/md0", 0, 0);
287 sys_ioctl(fd, RAID_AUTORUN, raid_autopart);
292 void __init md_run_setup(void)
294 create_dev("/dev/md0", MKDEV(MD_MAJOR, 0));
296 if (raid_noautodetect)
297 printk(KERN_INFO "md: Skipping autodetection of RAID arrays. (raid=autodetect will force)\n");