1 // SPDX-License-Identifier: GPL-2.0
2 #include <linux/delay.h>
3 #include <linux/raid/md_u.h>
4 #include <linux/raid/md_p.h>
5
6 #include "do_mounts.h"
7
8 /*
9 * When md (and any require personalities) are compiled into the kernel
10 * (not a module), arrays can be assembles are boot time using with AUTODETECT
11 * where specially marked partitions are registered with md_autodetect_dev(),
12 * and with MD_BOOT where devices to be collected are given on the boot line
13 * with md=.....
14 * The code for that is here.
15 */
16
17 #ifdef CONFIG_MD_AUTODETECT
18 static int __initdata raid_noautodetect;
19 #else
20 static int __initdata raid_noautodetect=1;
21 #endif
22 static int __initdata raid_autopart;
23
24 static struct {
25 int minor;
26 int partitioned;
27 int level;
28 int chunk;
29 char *device_names;
30 } md_setup_args[256] __initdata;
31
32 static int md_setup_ents __initdata;
33
34 /*
35 * Parse the command-line parameters given our kernel, but do not
36 * actually try to invoke the MD device now; that is handled by
37 * md_setup_drive after the low-level disk drivers have initialised.
38 *
39 * 27/11/1999: Fixed to work correctly with the 2.3 kernel (which
40 * assigns the task of parsing integer arguments to the
41 * invoked program now). Added ability to initialise all
42 * the MD devices (by specifying multiple "md=" lines)
43 * instead of just one. -- KTK
44 * 18May2000: Added support for persistent-superblock arrays:
45 * md=n,0,factor,fault,device-list uses RAID0 for device n
46 * md=n,-1,factor,fault,device-list uses LINEAR for device n
47 * md=n,device-list reads a RAID superblock from the devices
48 * elements in device-list are read by name_to_kdev_t so can be
49 * a hex number or something like /dev/hda1 /dev/sdb
50 * 2001-06-03: Dave Cinege <dcinege@psychosis.com>
51 * Shifted name_to_kdev_t() and related operations to md_set_drive()
52 * for later execution. Rewrote section to make devfs compatible.
53 */
md_setup(char * str)54 static int __init md_setup(char *str)
55 {
56 int minor, level, factor, fault, partitioned = 0;
57 char *pername = "";
58 char *str1;
59 int ent;
60
61 if (*str == 'd') {
62 partitioned = 1;
63 str++;
64 }
65 if (get_option(&str, &minor) != 2) { /* MD Number */
66 printk(KERN_WARNING "md: Too few arguments supplied to md=.\n");
67 return 0;
68 }
69 str1 = str;
70 for (ent=0 ; ent< md_setup_ents ; ent++)
71 if (md_setup_args[ent].minor == minor &&
72 md_setup_args[ent].partitioned == partitioned) {
73 printk(KERN_WARNING "md: md=%s%d, Specified more than once. "
74 "Replacing previous definition.\n", partitioned?"d":"", minor);
75 break;
76 }
77 if (ent >= ARRAY_SIZE(md_setup_args)) {
78 printk(KERN_WARNING "md: md=%s%d - too many md initialisations\n", partitioned?"d":"", minor);
79 return 0;
80 }
81 if (ent >= md_setup_ents)
82 md_setup_ents++;
83 switch (get_option(&str, &level)) { /* RAID level */
84 case 2: /* could be 0 or -1.. */
85 if (level == 0 || level == LEVEL_LINEAR) {
86 if (get_option(&str, &factor) != 2 || /* Chunk Size */
87 get_option(&str, &fault) != 2) {
88 printk(KERN_WARNING "md: Too few arguments supplied to md=.\n");
89 return 0;
90 }
91 md_setup_args[ent].level = level;
92 md_setup_args[ent].chunk = 1 << (factor+12);
93 if (level == LEVEL_LINEAR)
94 pername = "linear";
95 else
96 pername = "raid0";
97 break;
98 }
99 /* FALL THROUGH */
100 case 1: /* the first device is numeric */
101 str = str1;
102 /* FALL THROUGH */
103 case 0:
104 md_setup_args[ent].level = LEVEL_NONE;
105 pername="super-block";
106 }
107
108 printk(KERN_INFO "md: Will configure md%d (%s) from %s, below.\n",
109 minor, pername, str);
110 md_setup_args[ent].device_names = str;
111 md_setup_args[ent].partitioned = partitioned;
112 md_setup_args[ent].minor = minor;
113
114 return 1;
115 }
116
md_setup_drive(void)117 static 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;
128 char name[16];
129
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);
135 if (partitioned)
136 dev = MKDEV(mdp_major, minor << MdpMinorShift);
137 else
138 dev = MKDEV(MD_MAJOR, minor);
139 create_dev(name, dev);
140 for (i = 0; i < MD_SB_DISKS && devname != NULL; i++) {
141 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 = ksys_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 (ksys_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 ksys_close(fd);
185 continue;
186 }
187
188 if (md_setup_args[ent].level != LEVEL_NONE) {
189 /* non-persistent */
190 mdu_array_info_t ainfo;
191 ainfo.level = md_setup_args[ent].level;
192 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 = ksys_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 = ksys_ioctl(fd, ADD_NEW_DISK,
214 (long)&dinfo);
215 }
216 } else {
217 /* persistent */
218 for (i = 0; i <= MD_SB_DISKS; i++) {
219 dev = devices[i];
220 if (!dev)
221 break;
222 dinfo.major = MAJOR(dev);
223 dinfo.minor = MINOR(dev);
224 ksys_ioctl(fd, ADD_NEW_DISK, (long)&dinfo);
225 }
226 }
227 if (!err)
228 err = ksys_ioctl(fd, RUN_ARRAY, 0);
229 if (err)
230 printk(KERN_WARNING "md: starting md%d failed\n", minor);
231 else {
232 /* reread the partition table.
233 * I (neilb) and not sure why this is needed, but I cannot
234 * boot a kernel with devfs compiled in from partitioned md
235 * array without it
236 */
237 ksys_close(fd);
238 fd = ksys_open(name, 0, 0);
239 ksys_ioctl(fd, BLKRRPART, 0);
240 }
241 ksys_close(fd);
242 }
243 }
244
raid_setup(char * str)245 static int __init raid_setup(char *str)
246 {
247 int len, pos;
248
249 len = strlen(str) + 1;
250 pos = 0;
251
252 while (pos < len) {
253 char *comma = strchr(str+pos, ',');
254 int wlen;
255 if (comma)
256 wlen = (comma-str)-pos;
257 else wlen = (len-1)-pos;
258
259 if (!strncmp(str, "noautodetect", wlen))
260 raid_noautodetect = 1;
261 if (!strncmp(str, "autodetect", wlen))
262 raid_noautodetect = 0;
263 if (strncmp(str, "partitionable", wlen)==0)
264 raid_autopart = 1;
265 if (strncmp(str, "part", wlen)==0)
266 raid_autopart = 1;
267 pos += wlen+1;
268 }
269 return 1;
270 }
271
272 __setup("raid=", raid_setup);
273 __setup("md=", md_setup);
274
autodetect_raid(void)275 static void __init autodetect_raid(void)
276 {
277 int fd;
278
279 /*
280 * Since we don't want to detect and use half a raid array, we need to
281 * wait for the known devices to complete their probing
282 */
283 printk(KERN_INFO "md: Waiting for all devices to be available before autodetect\n");
284 printk(KERN_INFO "md: If you don't use raid, use raid=noautodetect\n");
285
286 wait_for_device_probe();
287
288 fd = ksys_open("/dev/md0", 0, 0);
289 if (fd >= 0) {
290 ksys_ioctl(fd, RAID_AUTORUN, raid_autopart);
291 ksys_close(fd);
292 }
293 }
294
md_run_setup(void)295 void __init md_run_setup(void)
296 {
297 create_dev("/dev/md0", MKDEV(MD_MAJOR, 0));
298
299 if (raid_noautodetect)
300 printk(KERN_INFO "md: Skipping autodetection of RAID arrays. (raid=autodetect will force)\n");
301 else
302 autodetect_raid();
303 md_setup_drive();
304 }
305
