blob: 7473b0c59d4dd11c438bd4808c0044caba4e7a33 [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001
2#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
15static int __initdata raid_noautodetect, raid_autopart;
16
17static struct {
18 int minor;
19 int partitioned;
NeilBrown2604b702006-01-06 00:20:36 -080020 int level;
Linus Torvalds1da177e2005-04-16 15:20:36 -070021 int chunk;
22 char *device_names;
NeilBrowne8703fe2006-10-03 01:15:59 -070023} md_setup_args[256] __initdata;
Linus Torvalds1da177e2005-04-16 15:20:36 -070024
25static int md_setup_ents __initdata;
26
27extern int mdp_major;
28/*
29 * Parse the command-line parameters given our kernel, but do not
30 * actually try to invoke the MD device now; that is handled by
31 * md_setup_drive after the low-level disk drivers have initialised.
32 *
33 * 27/11/1999: Fixed to work correctly with the 2.3 kernel (which
34 * assigns the task of parsing integer arguments to the
35 * invoked program now). Added ability to initialise all
36 * the MD devices (by specifying multiple "md=" lines)
37 * instead of just one. -- KTK
38 * 18May2000: Added support for persistent-superblock arrays:
39 * md=n,0,factor,fault,device-list uses RAID0 for device n
40 * md=n,-1,factor,fault,device-list uses LINEAR for device n
41 * md=n,device-list reads a RAID superblock from the devices
42 * elements in device-list are read by name_to_kdev_t so can be
43 * a hex number or something like /dev/hda1 /dev/sdb
44 * 2001-06-03: Dave Cinege <dcinege@psychosis.com>
45 * Shifted name_to_kdev_t() and related operations to md_set_drive()
46 * for later execution. Rewrote section to make devfs compatible.
47 */
48static int __init md_setup(char *str)
49{
NeilBrown2604b702006-01-06 00:20:36 -080050 int minor, level, factor, fault, partitioned = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -070051 char *pername = "";
52 char *str1;
53 int ent;
54
55 if (*str == 'd') {
56 partitioned = 1;
57 str++;
58 }
59 if (get_option(&str, &minor) != 2) { /* MD Number */
60 printk(KERN_WARNING "md: Too few arguments supplied to md=.\n");
61 return 0;
62 }
63 str1 = str;
Linus Torvalds1da177e2005-04-16 15:20:36 -070064 for (ent=0 ; ent< md_setup_ents ; ent++)
65 if (md_setup_args[ent].minor == minor &&
66 md_setup_args[ent].partitioned == partitioned) {
67 printk(KERN_WARNING "md: md=%s%d, Specified more than once. "
68 "Replacing previous definition.\n", partitioned?"d":"", minor);
69 break;
70 }
NeilBrowne8703fe2006-10-03 01:15:59 -070071 if (ent >= ARRAY_SIZE(md_setup_args)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -070072 printk(KERN_WARNING "md: md=%s%d - too many md initialisations\n", partitioned?"d":"", minor);
73 return 0;
74 }
75 if (ent >= md_setup_ents)
76 md_setup_ents++;
NeilBrown2604b702006-01-06 00:20:36 -080077 switch (get_option(&str, &level)) { /* RAID level */
Linus Torvalds1da177e2005-04-16 15:20:36 -070078 case 2: /* could be 0 or -1.. */
79 if (level == 0 || level == LEVEL_LINEAR) {
80 if (get_option(&str, &factor) != 2 || /* Chunk Size */
81 get_option(&str, &fault) != 2) {
82 printk(KERN_WARNING "md: Too few arguments supplied to md=.\n");
83 return 0;
84 }
NeilBrown2604b702006-01-06 00:20:36 -080085 md_setup_args[ent].level = level;
Linus Torvalds1da177e2005-04-16 15:20:36 -070086 md_setup_args[ent].chunk = 1 << (factor+12);
NeilBrown2604b702006-01-06 00:20:36 -080087 if (level == LEVEL_LINEAR)
Linus Torvalds1da177e2005-04-16 15:20:36 -070088 pername = "linear";
NeilBrown2604b702006-01-06 00:20:36 -080089 else
Linus Torvalds1da177e2005-04-16 15:20:36 -070090 pername = "raid0";
Linus Torvalds1da177e2005-04-16 15:20:36 -070091 break;
92 }
93 /* FALL THROUGH */
94 case 1: /* the first device is numeric */
95 str = str1;
96 /* FALL THROUGH */
97 case 0:
NeilBrown2604b702006-01-06 00:20:36 -080098 md_setup_args[ent].level = LEVEL_NONE;
Linus Torvalds1da177e2005-04-16 15:20:36 -070099 pername="super-block";
100 }
101
102 printk(KERN_INFO "md: Will configure md%d (%s) from %s, below.\n",
103 minor, pername, str);
104 md_setup_args[ent].device_names = str;
105 md_setup_args[ent].partitioned = partitioned;
106 md_setup_args[ent].minor = minor;
107
108 return 1;
109}
110
111#define MdpMinorShift 6
112
113static void __init md_setup_drive(void)
114{
115 int minor, i, ent, partitioned;
116 dev_t dev;
117 dev_t devices[MD_SB_DISKS+1];
118
119 for (ent = 0; ent < md_setup_ents ; ent++) {
120 int fd;
121 int err = 0;
122 char *devname;
123 mdu_disk_info_t dinfo;
Greg Kroah-Hartmanbdaf8522005-06-20 21:15:16 -0700124 char name[16];
Linus Torvalds1da177e2005-04-16 15:20:36 -0700125
126 minor = md_setup_args[ent].minor;
127 partitioned = md_setup_args[ent].partitioned;
128 devname = md_setup_args[ent].device_names;
129
130 sprintf(name, "/dev/md%s%d", partitioned?"_d":"", minor);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700131 if (partitioned)
132 dev = MKDEV(mdp_major, minor << MdpMinorShift);
133 else
134 dev = MKDEV(MD_MAJOR, minor);
Greg Kroah-Hartmanbdaf8522005-06-20 21:15:16 -0700135 create_dev(name, dev);
Harvey Harrisond613c3e2008-04-28 14:13:14 -0700136 for (i = 0; i < MD_SB_DISKS && devname != NULL; i++) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700137 char *p;
138 char comp_name[64];
139 u32 rdev;
140
141 p = strchr(devname, ',');
142 if (p)
143 *p++ = 0;
144
145 dev = name_to_dev_t(devname);
146 if (strncmp(devname, "/dev/", 5) == 0)
147 devname += 5;
148 snprintf(comp_name, 63, "/dev/%s", devname);
149 rdev = bstat(comp_name);
150 if (rdev)
151 dev = new_decode_dev(rdev);
152 if (!dev) {
153 printk(KERN_WARNING "md: Unknown device name: %s\n", devname);
154 break;
155 }
156
157 devices[i] = dev;
158
159 devname = p;
160 }
161 devices[i] = 0;
162
163 if (!i)
164 continue;
165
166 printk(KERN_INFO "md: Loading md%s%d: %s\n",
167 partitioned ? "_d" : "", minor,
168 md_setup_args[ent].device_names);
169
170 fd = sys_open(name, 0, 0);
171 if (fd < 0) {
172 printk(KERN_ERR "md: open failed - cannot start "
173 "array %s\n", name);
174 continue;
175 }
176 if (sys_ioctl(fd, SET_ARRAY_INFO, 0) == -EBUSY) {
177 printk(KERN_WARNING
178 "md: Ignoring md=%d, already autodetected. (Use raid=noautodetect)\n",
179 minor);
180 sys_close(fd);
181 continue;
182 }
183
NeilBrown2604b702006-01-06 00:20:36 -0800184 if (md_setup_args[ent].level != LEVEL_NONE) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700185 /* non-persistent */
186 mdu_array_info_t ainfo;
NeilBrown2604b702006-01-06 00:20:36 -0800187 ainfo.level = md_setup_args[ent].level;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700188 ainfo.size = 0;
189 ainfo.nr_disks =0;
190 ainfo.raid_disks =0;
191 while (devices[ainfo.raid_disks])
192 ainfo.raid_disks++;
193 ainfo.md_minor =minor;
194 ainfo.not_persistent = 1;
195
196 ainfo.state = (1 << MD_SB_CLEAN);
197 ainfo.layout = 0;
198 ainfo.chunk_size = md_setup_args[ent].chunk;
199 err = sys_ioctl(fd, SET_ARRAY_INFO, (long)&ainfo);
200 for (i = 0; !err && i <= MD_SB_DISKS; i++) {
201 dev = devices[i];
202 if (!dev)
203 break;
204 dinfo.number = i;
205 dinfo.raid_disk = i;
206 dinfo.state = (1<<MD_DISK_ACTIVE)|(1<<MD_DISK_SYNC);
207 dinfo.major = MAJOR(dev);
208 dinfo.minor = MINOR(dev);
209 err = sys_ioctl(fd, ADD_NEW_DISK, (long)&dinfo);
210 }
211 } else {
212 /* persistent */
213 for (i = 0; i <= MD_SB_DISKS; i++) {
214 dev = devices[i];
215 if (!dev)
216 break;
217 dinfo.major = MAJOR(dev);
218 dinfo.minor = MINOR(dev);
219 sys_ioctl(fd, ADD_NEW_DISK, (long)&dinfo);
220 }
221 }
222 if (!err)
223 err = sys_ioctl(fd, RUN_ARRAY, 0);
224 if (err)
225 printk(KERN_WARNING "md: starting md%d failed\n", minor);
226 else {
227 /* reread the partition table.
228 * I (neilb) and not sure why this is needed, but I cannot
229 * boot a kernel with devfs compiled in from partitioned md
230 * array without it
231 */
232 sys_close(fd);
233 fd = sys_open(name, 0, 0);
234 sys_ioctl(fd, BLKRRPART, 0);
235 }
236 sys_close(fd);
237 }
238}
239
240static int __init raid_setup(char *str)
241{
242 int len, pos;
243
244 len = strlen(str) + 1;
245 pos = 0;
246
247 while (pos < len) {
248 char *comma = strchr(str+pos, ',');
249 int wlen;
250 if (comma)
251 wlen = (comma-str)-pos;
252 else wlen = (len-1)-pos;
253
254 if (!strncmp(str, "noautodetect", wlen))
255 raid_noautodetect = 1;
256 if (strncmp(str, "partitionable", wlen)==0)
257 raid_autopart = 1;
258 if (strncmp(str, "part", wlen)==0)
259 raid_autopart = 1;
260 pos += wlen+1;
261 }
262 return 1;
263}
264
265__setup("raid=", raid_setup);
266__setup("md=", md_setup);
267
268void __init md_run_setup(void)
269{
Greg Kroah-Hartmanbdaf8522005-06-20 21:15:16 -0700270 create_dev("/dev/md0", MKDEV(MD_MAJOR, 0));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700271 if (raid_noautodetect)
272 printk(KERN_INFO "md: Skipping autodetection of RAID arrays. (raid=noautodetect)\n");
273 else {
274 int fd = sys_open("/dev/md0", 0, 0);
275 if (fd >= 0) {
276 sys_ioctl(fd, RAID_AUTORUN, raid_autopart);
277 sys_close(fd);
278 }
279 }
280 md_setup_drive();
281}