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
17 static int __initdata raid_noautodetect;
18 #else
19 static int __initdata raid_noautodetect=1;
20 #endif
21 static int __initdata raid_autopart;
22
23 static struct {
24 int minor;
25 int partitioned;
26 int level;
27 int chunk;
28 char *device_names;
29 } md_setup_args[256] __initdata;
30
31 static 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 */
md_setup(char * str)53 static 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
md_setup_drive(void)116 static 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
raid_setup(char * str)243 static 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
autodetect_raid(void)273 static 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((const char __user __force *) "/dev/md0", 0, 0);
287 if (fd >= 0) {
288 sys_ioctl(fd, RAID_AUTORUN, raid_autopart);
289 sys_close(fd);
290 }
291 }
292
md_run_setup(void)293 void __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