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], devfs_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 sprintf(devfs_name, "/dev/md/%s%d", partitioned?"d":"", minor);
136 if (partitioned)
137 dev = MKDEV(mdp_major, minor << MdpMinorShift);
138 else
139 dev = MKDEV(MD_MAJOR, minor);
140 create_dev(name, dev, devfs_name);
141 for (i = 0; i < MD_SB_DISKS && devname != 0; i++) {
142 char *p;
143 char comp_name[64];
144 u32 rdev;
145
146 p = strchr(devname, ',');
147 if (p)
148 *p++ = 0;
149
150 dev = name_to_dev_t(devname);
151 if (strncmp(devname, "/dev/", 5) == 0)
152 devname += 5;
153 snprintf(comp_name, 63, "/dev/%s", devname);
154 rdev = bstat(comp_name);
155 if (rdev)
156 dev = new_decode_dev(rdev);
157 if (!dev) {
158 printk(KERN_WARNING "md: Unknown device name: %s\n", devname);
159 break;
160 }
161
162 devices[i] = dev;
163
164 devname = p;
165 }
166 devices[i] = 0;
167
168 if (!i)
169 continue;
170
171 printk(KERN_INFO "md: Loading md%s%d: %s\n",
172 partitioned ? "_d" : "", minor,
173 md_setup_args[ent].device_names);
174
175 fd = sys_open(name, 0, 0);
176 if (fd < 0) {
177 printk(KERN_ERR "md: open failed - cannot start "
178 "array %s\n", name);
179 continue;
180 }
181 if (sys_ioctl(fd, SET_ARRAY_INFO, 0) == -EBUSY) {
182 printk(KERN_WARNING
183 "md: Ignoring md=%d, already autodetected. (Use raid=noautodetect)\n",
184 minor);
185 sys_close(fd);
186 continue;
187 }
188
189 if (md_setup_args[ent].level != LEVEL_NONE) {
190 /* non-persistent */
191 mdu_array_info_t ainfo;
192 ainfo.level = md_setup_args[ent].level;
193 ainfo.size = 0;
194 ainfo.nr_disks =0;
195 ainfo.raid_disks =0;
196 while (devices[ainfo.raid_disks])
197 ainfo.raid_disks++;
198 ainfo.md_minor =minor;
199 ainfo.not_persistent = 1;
200
201 ainfo.state = (1 << MD_SB_CLEAN);
202 ainfo.layout = 0;
203 ainfo.chunk_size = md_setup_args[ent].chunk;
204 err = sys_ioctl(fd, SET_ARRAY_INFO, (long)&ainfo);
205 for (i = 0; !err && i <= MD_SB_DISKS; i++) {
206 dev = devices[i];
207 if (!dev)
208 break;
209 dinfo.number = i;
210 dinfo.raid_disk = i;
211 dinfo.state = (1<<MD_DISK_ACTIVE)|(1<<MD_DISK_SYNC);
212 dinfo.major = MAJOR(dev);
213 dinfo.minor = MINOR(dev);
214 err = sys_ioctl(fd, ADD_NEW_DISK, (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 sys_ioctl(fd, ADD_NEW_DISK, (long)&dinfo);
225 }
226 }
227 if (!err)
228 err = sys_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 sys_close(fd);
238 fd = sys_open(name, 0, 0);
239 sys_ioctl(fd, BLKRRPART, 0);
240 }
241 sys_close(fd);
242 }
243}
244
245static 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, "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
273void __init md_run_setup(void)
274{
275 create_dev("/dev/md0", MKDEV(MD_MAJOR, 0), "md/0");
276 if (raid_noautodetect)
277 printk(KERN_INFO "md: Skipping autodetection of RAID arrays. (raid=noautodetect)\n");
278 else {
279 int fd = sys_open("/dev/md0", 0, 0);
280 if (fd >= 0) {
281 sys_ioctl(fd, RAID_AUTORUN, raid_autopart);
282 sys_close(fd);
283 }
284 }
285 md_setup_drive();
286}