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 pers;
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, pers, 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 Personality */
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].pers = level;
90 md_setup_args[ent].chunk = 1 << (factor+12);
91 if (level == LEVEL_LINEAR) {
92 pers = LINEAR;
93 pername = "linear";
94 } else {
95 pers = RAID0;
96 pername = "raid0";
97 }
98 md_setup_args[ent].pers = pers;
99 break;
100 }
101 /* FALL THROUGH */
102 case 1: /* the first device is numeric */
103 str = str1;
104 /* FALL THROUGH */
105 case 0:
106 md_setup_args[ent].pers = 0;
107 pername="super-block";
108 }
109
110 printk(KERN_INFO "md: Will configure md%d (%s) from %s, below.\n",
111 minor, pername, str);
112 md_setup_args[ent].device_names = str;
113 md_setup_args[ent].partitioned = partitioned;
114 md_setup_args[ent].minor = minor;
115
116 return 1;
117}
118
119#define MdpMinorShift 6
120
121static void __init md_setup_drive(void)
122{
123 int minor, i, ent, partitioned;
124 dev_t dev;
125 dev_t devices[MD_SB_DISKS+1];
126
127 for (ent = 0; ent < md_setup_ents ; ent++) {
128 int fd;
129 int err = 0;
130 char *devname;
131 mdu_disk_info_t dinfo;
132 char name[16], devfs_name[16];
133
134 minor = md_setup_args[ent].minor;
135 partitioned = md_setup_args[ent].partitioned;
136 devname = md_setup_args[ent].device_names;
137
138 sprintf(name, "/dev/md%s%d", partitioned?"_d":"", minor);
139 sprintf(devfs_name, "/dev/md/%s%d", partitioned?"d":"", minor);
140 if (partitioned)
141 dev = MKDEV(mdp_major, minor << MdpMinorShift);
142 else
143 dev = MKDEV(MD_MAJOR, minor);
144 create_dev(name, dev, devfs_name);
145 for (i = 0; i < MD_SB_DISKS && devname != 0; i++) {
146 char *p;
147 char comp_name[64];
148 u32 rdev;
149
150 p = strchr(devname, ',');
151 if (p)
152 *p++ = 0;
153
154 dev = name_to_dev_t(devname);
155 if (strncmp(devname, "/dev/", 5) == 0)
156 devname += 5;
157 snprintf(comp_name, 63, "/dev/%s", devname);
158 rdev = bstat(comp_name);
159 if (rdev)
160 dev = new_decode_dev(rdev);
161 if (!dev) {
162 printk(KERN_WARNING "md: Unknown device name: %s\n", devname);
163 break;
164 }
165
166 devices[i] = dev;
167
168 devname = p;
169 }
170 devices[i] = 0;
171
172 if (!i)
173 continue;
174
175 printk(KERN_INFO "md: Loading md%s%d: %s\n",
176 partitioned ? "_d" : "", minor,
177 md_setup_args[ent].device_names);
178
179 fd = sys_open(name, 0, 0);
180 if (fd < 0) {
181 printk(KERN_ERR "md: open failed - cannot start "
182 "array %s\n", name);
183 continue;
184 }
185 if (sys_ioctl(fd, SET_ARRAY_INFO, 0) == -EBUSY) {
186 printk(KERN_WARNING
187 "md: Ignoring md=%d, already autodetected. (Use raid=noautodetect)\n",
188 minor);
189 sys_close(fd);
190 continue;
191 }
192
193 if (md_setup_args[ent].pers) {
194 /* non-persistent */
195 mdu_array_info_t ainfo;
196 ainfo.level = pers_to_level(md_setup_args[ent].pers);
197 ainfo.size = 0;
198 ainfo.nr_disks =0;
199 ainfo.raid_disks =0;
200 while (devices[ainfo.raid_disks])
201 ainfo.raid_disks++;
202 ainfo.md_minor =minor;
203 ainfo.not_persistent = 1;
204
205 ainfo.state = (1 << MD_SB_CLEAN);
206 ainfo.layout = 0;
207 ainfo.chunk_size = md_setup_args[ent].chunk;
208 err = sys_ioctl(fd, SET_ARRAY_INFO, (long)&ainfo);
209 for (i = 0; !err && i <= MD_SB_DISKS; i++) {
210 dev = devices[i];
211 if (!dev)
212 break;
213 dinfo.number = i;
214 dinfo.raid_disk = i;
215 dinfo.state = (1<<MD_DISK_ACTIVE)|(1<<MD_DISK_SYNC);
216 dinfo.major = MAJOR(dev);
217 dinfo.minor = MINOR(dev);
218 err = sys_ioctl(fd, ADD_NEW_DISK, (long)&dinfo);
219 }
220 } else {
221 /* persistent */
222 for (i = 0; i <= MD_SB_DISKS; i++) {
223 dev = devices[i];
224 if (!dev)
225 break;
226 dinfo.major = MAJOR(dev);
227 dinfo.minor = MINOR(dev);
228 sys_ioctl(fd, ADD_NEW_DISK, (long)&dinfo);
229 }
230 }
231 if (!err)
232 err = sys_ioctl(fd, RUN_ARRAY, 0);
233 if (err)
234 printk(KERN_WARNING "md: starting md%d failed\n", minor);
235 else {
236 /* reread the partition table.
237 * I (neilb) and not sure why this is needed, but I cannot
238 * boot a kernel with devfs compiled in from partitioned md
239 * array without it
240 */
241 sys_close(fd);
242 fd = sys_open(name, 0, 0);
243 sys_ioctl(fd, BLKRRPART, 0);
244 }
245 sys_close(fd);
246 }
247}
248
249static int __init raid_setup(char *str)
250{
251 int len, pos;
252
253 len = strlen(str) + 1;
254 pos = 0;
255
256 while (pos < len) {
257 char *comma = strchr(str+pos, ',');
258 int wlen;
259 if (comma)
260 wlen = (comma-str)-pos;
261 else wlen = (len-1)-pos;
262
263 if (!strncmp(str, "noautodetect", wlen))
264 raid_noautodetect = 1;
265 if (strncmp(str, "partitionable", wlen)==0)
266 raid_autopart = 1;
267 if (strncmp(str, "part", wlen)==0)
268 raid_autopart = 1;
269 pos += wlen+1;
270 }
271 return 1;
272}
273
274__setup("raid=", raid_setup);
275__setup("md=", md_setup);
276
277void __init md_run_setup(void)
278{
279 create_dev("/dev/md0", MKDEV(MD_MAJOR, 0), "md/0");
280 if (raid_noautodetect)
281 printk(KERN_INFO "md: Skipping autodetection of RAID arrays. (raid=noautodetect)\n");
282 else {
283 int fd = sys_open("/dev/md0", 0, 0);
284 if (fd >= 0) {
285 sys_ioctl(fd, RAID_AUTORUN, raid_autopart);
286 sys_close(fd);
287 }
288 }
289 md_setup_drive();
290}