blob: ff95e319288472caaf3aa086c0fca769b0706b2f [file] [log] [blame]
Alexey Dobriyanf8b77d32008-10-29 14:01:05 -07001#include <linux/delay.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -07002#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
Arjan van de Vena3640922008-09-21 15:44:32 -070015#ifdef CONFIG_MD_AUTODETECT
16static int __initdata raid_noautodetect;
17#else
18static int __initdata raid_noautodetect=1;
19#endif
20static int __initdata raid_autopart;
Linus Torvalds1da177e2005-04-16 15:20:36 -070021
22static struct {
23 int minor;
24 int partitioned;
NeilBrown2604b702006-01-06 00:20:36 -080025 int level;
Linus Torvalds1da177e2005-04-16 15:20:36 -070026 int chunk;
27 char *device_names;
NeilBrowne8703fe2006-10-03 01:15:59 -070028} md_setup_args[256] __initdata;
Linus Torvalds1da177e2005-04-16 15:20:36 -070029
30static int md_setup_ents __initdata;
31
Linus Torvalds1da177e2005-04-16 15:20:36 -070032/*
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.
36 *
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.
51 */
52static int __init md_setup(char *str)
53{
NeilBrown2604b702006-01-06 00:20:36 -080054 int minor, level, factor, fault, partitioned = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -070055 char *pername = "";
56 char *str1;
57 int ent;
58
59 if (*str == 'd') {
60 partitioned = 1;
61 str++;
62 }
63 if (get_option(&str, &minor) != 2) { /* MD Number */
64 printk(KERN_WARNING "md: Too few arguments supplied to md=.\n");
65 return 0;
66 }
67 str1 = str;
Linus Torvalds1da177e2005-04-16 15:20:36 -070068 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 }
NeilBrowne8703fe2006-10-03 01:15:59 -070075 if (ent >= ARRAY_SIZE(md_setup_args)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -070076 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++;
NeilBrown2604b702006-01-06 00:20:36 -080081 switch (get_option(&str, &level)) { /* RAID level */
Linus Torvalds1da177e2005-04-16 15:20:36 -070082 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 }
NeilBrown2604b702006-01-06 00:20:36 -080089 md_setup_args[ent].level = level;
Linus Torvalds1da177e2005-04-16 15:20:36 -070090 md_setup_args[ent].chunk = 1 << (factor+12);
NeilBrown2604b702006-01-06 00:20:36 -080091 if (level == LEVEL_LINEAR)
Linus Torvalds1da177e2005-04-16 15:20:36 -070092 pername = "linear";
NeilBrown2604b702006-01-06 00:20:36 -080093 else
Linus Torvalds1da177e2005-04-16 15:20:36 -070094 pername = "raid0";
Linus Torvalds1da177e2005-04-16 15:20:36 -070095 break;
96 }
97 /* FALL THROUGH */
98 case 1: /* the first device is numeric */
99 str = str1;
100 /* FALL THROUGH */
101 case 0:
NeilBrown2604b702006-01-06 00:20:36 -0800102 md_setup_args[ent].level = LEVEL_NONE;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700103 pername="super-block";
104 }
105
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;
111
112 return 1;
113}
114
115#define MdpMinorShift 6
116
117static void __init md_setup_drive(void)
118{
119 int minor, i, ent, partitioned;
120 dev_t dev;
121 dev_t devices[MD_SB_DISKS+1];
122
123 for (ent = 0; ent < md_setup_ents ; ent++) {
124 int fd;
125 int err = 0;
126 char *devname;
127 mdu_disk_info_t dinfo;
Greg Kroah-Hartmanbdaf8522005-06-20 21:15:16 -0700128 char name[16];
Linus Torvalds1da177e2005-04-16 15:20:36 -0700129
130 minor = md_setup_args[ent].minor;
131 partitioned = md_setup_args[ent].partitioned;
132 devname = md_setup_args[ent].device_names;
133
134 sprintf(name, "/dev/md%s%d", partitioned?"_d":"", minor);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700135 if (partitioned)
136 dev = MKDEV(mdp_major, minor << MdpMinorShift);
137 else
138 dev = MKDEV(MD_MAJOR, minor);
Greg Kroah-Hartmanbdaf8522005-06-20 21:15:16 -0700139 create_dev(name, dev);
Harvey Harrisond613c3e2008-04-28 14:13:14 -0700140 for (i = 0; i < MD_SB_DISKS && devname != NULL; i++) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700141 char *p;
142 char comp_name[64];
143 u32 rdev;
144
145 p = strchr(devname, ',');
146 if (p)
147 *p++ = 0;
148
149 dev = name_to_dev_t(devname);
150 if (strncmp(devname, "/dev/", 5) == 0)
151 devname += 5;
152 snprintf(comp_name, 63, "/dev/%s", devname);
153 rdev = bstat(comp_name);
154 if (rdev)
155 dev = new_decode_dev(rdev);
156 if (!dev) {
157 printk(KERN_WARNING "md: Unknown device name: %s\n", devname);
158 break;
159 }
160
161 devices[i] = dev;
162
163 devname = p;
164 }
165 devices[i] = 0;
166
167 if (!i)
168 continue;
169
170 printk(KERN_INFO "md: Loading md%s%d: %s\n",
171 partitioned ? "_d" : "", minor,
172 md_setup_args[ent].device_names);
173
174 fd = sys_open(name, 0, 0);
175 if (fd < 0) {
176 printk(KERN_ERR "md: open failed - cannot start "
177 "array %s\n", name);
178 continue;
179 }
180 if (sys_ioctl(fd, SET_ARRAY_INFO, 0) == -EBUSY) {
181 printk(KERN_WARNING
182 "md: Ignoring md=%d, already autodetected. (Use raid=noautodetect)\n",
183 minor);
184 sys_close(fd);
185 continue;
186 }
187
NeilBrown2604b702006-01-06 00:20:36 -0800188 if (md_setup_args[ent].level != LEVEL_NONE) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700189 /* non-persistent */
190 mdu_array_info_t ainfo;
NeilBrown2604b702006-01-06 00:20:36 -0800191 ainfo.level = md_setup_args[ent].level;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700192 ainfo.size = 0;
193 ainfo.nr_disks =0;
194 ainfo.raid_disks =0;
195 while (devices[ainfo.raid_disks])
196 ainfo.raid_disks++;
197 ainfo.md_minor =minor;
198 ainfo.not_persistent = 1;
199
200 ainfo.state = (1 << MD_SB_CLEAN);
201 ainfo.layout = 0;
202 ainfo.chunk_size = md_setup_args[ent].chunk;
203 err = sys_ioctl(fd, SET_ARRAY_INFO, (long)&ainfo);
204 for (i = 0; !err && i <= MD_SB_DISKS; i++) {
205 dev = devices[i];
206 if (!dev)
207 break;
208 dinfo.number = i;
209 dinfo.raid_disk = i;
210 dinfo.state = (1<<MD_DISK_ACTIVE)|(1<<MD_DISK_SYNC);
211 dinfo.major = MAJOR(dev);
212 dinfo.minor = MINOR(dev);
213 err = sys_ioctl(fd, ADD_NEW_DISK, (long)&dinfo);
214 }
215 } else {
216 /* persistent */
217 for (i = 0; i <= MD_SB_DISKS; i++) {
218 dev = devices[i];
219 if (!dev)
220 break;
221 dinfo.major = MAJOR(dev);
222 dinfo.minor = MINOR(dev);
223 sys_ioctl(fd, ADD_NEW_DISK, (long)&dinfo);
224 }
225 }
226 if (!err)
227 err = sys_ioctl(fd, RUN_ARRAY, 0);
228 if (err)
229 printk(KERN_WARNING "md: starting md%d failed\n", minor);
230 else {
231 /* reread the partition table.
232 * I (neilb) and not sure why this is needed, but I cannot
233 * boot a kernel with devfs compiled in from partitioned md
234 * array without it
235 */
236 sys_close(fd);
237 fd = sys_open(name, 0, 0);
238 sys_ioctl(fd, BLKRRPART, 0);
239 }
240 sys_close(fd);
241 }
242}
243
244static int __init raid_setup(char *str)
245{
246 int len, pos;
247
248 len = strlen(str) + 1;
249 pos = 0;
250
251 while (pos < len) {
252 char *comma = strchr(str+pos, ',');
253 int wlen;
254 if (comma)
255 wlen = (comma-str)-pos;
256 else wlen = (len-1)-pos;
257
258 if (!strncmp(str, "noautodetect", wlen))
259 raid_noautodetect = 1;
Arjan van de Vena3640922008-09-21 15:44:32 -0700260 if (!strncmp(str, "autodetect", wlen))
261 raid_noautodetect = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700262 if (strncmp(str, "partitionable", wlen)==0)
263 raid_autopart = 1;
264 if (strncmp(str, "part", wlen)==0)
265 raid_autopart = 1;
266 pos += wlen+1;
267 }
268 return 1;
269}
270
271__setup("raid=", raid_setup);
272__setup("md=", md_setup);
273
Mike Frysingerff083c82009-01-06 14:40:53 -0800274static void __init autodetect_raid(void)
Ingo Molnar82cbc112008-08-18 12:54:00 +0200275{
276 int fd;
277
278 /*
279 * Since we don't want to detect and use half a raid array, we need to
280 * wait for the known devices to complete their probing
281 */
282 printk(KERN_INFO "md: Waiting for all devices to be available before autodetect\n");
283 printk(KERN_INFO "md: If you don't use raid, use raid=noautodetect\n");
284 while (driver_probe_done() < 0)
285 msleep(100);
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
Linus Torvalds1da177e2005-04-16 15:20:36 -0700293void __init md_run_setup(void)
294{
Greg Kroah-Hartmanbdaf8522005-06-20 21:15:16 -0700295 create_dev("/dev/md0", MKDEV(MD_MAJOR, 0));
Arjan van de Ven589f8002008-07-20 13:07:09 -0700296
Linus Torvalds1da177e2005-04-16 15:20:36 -0700297 if (raid_noautodetect)
Arjan van de Vena3640922008-09-21 15:44:32 -0700298 printk(KERN_INFO "md: Skipping autodetection of RAID arrays. (raid=autodetect will force)\n");
Ingo Molnar82cbc112008-08-18 12:54:00 +0200299 else
300 autodetect_raid();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700301 md_setup_drive();
302}