tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1
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;
20 int level;
21 int chunk;
22 char *device_names;
23} md_setup_args[MAX_MD_DEVS] __initdata;
24
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{
50 int minor, level, factor, fault, partitioned = 0;
51 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;
64 if (minor >= MAX_MD_DEVS) {
65 printk(KERN_WARNING "md: md=%d, Minor device number too high.\n", minor);
66 return 0;
67 }
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);
73 break;
74 }
75 if (ent >= MAX_MD_DEVS) {
76 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++;
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");
87 return 0;
88 }
89 md_setup_args[ent].level = level;
90 md_setup_args[ent].chunk = 1 << (factor+12);
91 if (level == LEVEL_LINEAR)
92 pername = "linear";
93 else
94 pername = "raid0";
95 break;
96 }
97 /* FALL THROUGH */
98 case 1: /* the first device is numeric */
99 str = str1;
100 /* FALL THROUGH */
101 case 0:
102 md_setup_args[ent].level = LEVEL_NONE;
103 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;
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 != 0; 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 = 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
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 = 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;
260 if (strncmp(str, "partitionable", wlen)==0)
261 raid_autopart = 1;
262 if (strncmp(str, "part", wlen)==0)
263 raid_autopart = 1;
264 pos += wlen+1;
265 }
266 return 1;
267}
268
269__setup("raid=", raid_setup);
270__setup("md=", md_setup);
271
272void __init md_run_setup(void)
273{
274 create_dev("/dev/md0", MKDEV(MD_MAJOR, 0));
275 if (raid_noautodetect)
276 printk(KERN_INFO "md: Skipping autodetection of RAID arrays. (raid=noautodetect)\n");
277 else {
278 int fd = sys_open("/dev/md0", 0, 0);
279 if (fd >= 0) {
280 sys_ioctl(fd, RAID_AUTORUN, raid_autopart);
281 sys_close(fd);
282 }
283 }
284 md_setup_drive();
285}