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1da177e4 LT |
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 | ||
15 | static int __initdata raid_noautodetect, raid_autopart; | |
16 | ||
17 | static struct { | |
18 | int minor; | |
19 | int partitioned; | |
2604b703 | 20 | int level; |
1da177e4 LT |
21 | int chunk; |
22 | char *device_names; | |
e8703fe1 | 23 | } md_setup_args[256] __initdata; |
1da177e4 LT |
24 | |
25 | static int md_setup_ents __initdata; | |
26 | ||
1da177e4 LT |
27 | /* |
28 | * Parse the command-line parameters given our kernel, but do not | |
29 | * actually try to invoke the MD device now; that is handled by | |
30 | * md_setup_drive after the low-level disk drivers have initialised. | |
31 | * | |
32 | * 27/11/1999: Fixed to work correctly with the 2.3 kernel (which | |
33 | * assigns the task of parsing integer arguments to the | |
34 | * invoked program now). Added ability to initialise all | |
35 | * the MD devices (by specifying multiple "md=" lines) | |
36 | * instead of just one. -- KTK | |
37 | * 18May2000: Added support for persistent-superblock arrays: | |
38 | * md=n,0,factor,fault,device-list uses RAID0 for device n | |
39 | * md=n,-1,factor,fault,device-list uses LINEAR for device n | |
40 | * md=n,device-list reads a RAID superblock from the devices | |
41 | * elements in device-list are read by name_to_kdev_t so can be | |
42 | * a hex number or something like /dev/hda1 /dev/sdb | |
43 | * 2001-06-03: Dave Cinege <dcinege@psychosis.com> | |
44 | * Shifted name_to_kdev_t() and related operations to md_set_drive() | |
45 | * for later execution. Rewrote section to make devfs compatible. | |
46 | */ | |
47 | static int __init md_setup(char *str) | |
48 | { | |
2604b703 | 49 | int minor, level, factor, fault, partitioned = 0; |
1da177e4 LT |
50 | char *pername = ""; |
51 | char *str1; | |
52 | int ent; | |
53 | ||
54 | if (*str == 'd') { | |
55 | partitioned = 1; | |
56 | str++; | |
57 | } | |
58 | if (get_option(&str, &minor) != 2) { /* MD Number */ | |
59 | printk(KERN_WARNING "md: Too few arguments supplied to md=.\n"); | |
60 | return 0; | |
61 | } | |
62 | str1 = str; | |
1da177e4 LT |
63 | for (ent=0 ; ent< md_setup_ents ; ent++) |
64 | if (md_setup_args[ent].minor == minor && | |
65 | md_setup_args[ent].partitioned == partitioned) { | |
66 | printk(KERN_WARNING "md: md=%s%d, Specified more than once. " | |
67 | "Replacing previous definition.\n", partitioned?"d":"", minor); | |
68 | break; | |
69 | } | |
e8703fe1 | 70 | if (ent >= ARRAY_SIZE(md_setup_args)) { |
1da177e4 LT |
71 | printk(KERN_WARNING "md: md=%s%d - too many md initialisations\n", partitioned?"d":"", minor); |
72 | return 0; | |
73 | } | |
74 | if (ent >= md_setup_ents) | |
75 | md_setup_ents++; | |
2604b703 | 76 | switch (get_option(&str, &level)) { /* RAID level */ |
1da177e4 LT |
77 | case 2: /* could be 0 or -1.. */ |
78 | if (level == 0 || level == LEVEL_LINEAR) { | |
79 | if (get_option(&str, &factor) != 2 || /* Chunk Size */ | |
80 | get_option(&str, &fault) != 2) { | |
81 | printk(KERN_WARNING "md: Too few arguments supplied to md=.\n"); | |
82 | return 0; | |
83 | } | |
2604b703 | 84 | md_setup_args[ent].level = level; |
1da177e4 | 85 | md_setup_args[ent].chunk = 1 << (factor+12); |
2604b703 | 86 | if (level == LEVEL_LINEAR) |
1da177e4 | 87 | pername = "linear"; |
2604b703 | 88 | else |
1da177e4 | 89 | pername = "raid0"; |
1da177e4 LT |
90 | break; |
91 | } | |
92 | /* FALL THROUGH */ | |
93 | case 1: /* the first device is numeric */ | |
94 | str = str1; | |
95 | /* FALL THROUGH */ | |
96 | case 0: | |
2604b703 | 97 | md_setup_args[ent].level = LEVEL_NONE; |
1da177e4 LT |
98 | pername="super-block"; |
99 | } | |
100 | ||
101 | printk(KERN_INFO "md: Will configure md%d (%s) from %s, below.\n", | |
102 | minor, pername, str); | |
103 | md_setup_args[ent].device_names = str; | |
104 | md_setup_args[ent].partitioned = partitioned; | |
105 | md_setup_args[ent].minor = minor; | |
106 | ||
107 | return 1; | |
108 | } | |
109 | ||
110 | #define MdpMinorShift 6 | |
111 | ||
112 | static void __init md_setup_drive(void) | |
113 | { | |
114 | int minor, i, ent, partitioned; | |
115 | dev_t dev; | |
116 | dev_t devices[MD_SB_DISKS+1]; | |
117 | ||
118 | for (ent = 0; ent < md_setup_ents ; ent++) { | |
119 | int fd; | |
120 | int err = 0; | |
121 | char *devname; | |
122 | mdu_disk_info_t dinfo; | |
bdaf8529 | 123 | char name[16]; |
1da177e4 LT |
124 | |
125 | minor = md_setup_args[ent].minor; | |
126 | partitioned = md_setup_args[ent].partitioned; | |
127 | devname = md_setup_args[ent].device_names; | |
128 | ||
129 | sprintf(name, "/dev/md%s%d", partitioned?"_d":"", minor); | |
1da177e4 LT |
130 | if (partitioned) |
131 | dev = MKDEV(mdp_major, minor << MdpMinorShift); | |
132 | else | |
133 | dev = MKDEV(MD_MAJOR, minor); | |
bdaf8529 | 134 | create_dev(name, dev); |
d613c3e2 | 135 | for (i = 0; i < MD_SB_DISKS && devname != NULL; i++) { |
1da177e4 LT |
136 | char *p; |
137 | char comp_name[64]; | |
138 | u32 rdev; | |
139 | ||
140 | p = strchr(devname, ','); | |
141 | if (p) | |
142 | *p++ = 0; | |
143 | ||
144 | dev = name_to_dev_t(devname); | |
145 | if (strncmp(devname, "/dev/", 5) == 0) | |
146 | devname += 5; | |
147 | snprintf(comp_name, 63, "/dev/%s", devname); | |
148 | rdev = bstat(comp_name); | |
149 | if (rdev) | |
150 | dev = new_decode_dev(rdev); | |
151 | if (!dev) { | |
152 | printk(KERN_WARNING "md: Unknown device name: %s\n", devname); | |
153 | break; | |
154 | } | |
155 | ||
156 | devices[i] = dev; | |
157 | ||
158 | devname = p; | |
159 | } | |
160 | devices[i] = 0; | |
161 | ||
162 | if (!i) | |
163 | continue; | |
164 | ||
165 | printk(KERN_INFO "md: Loading md%s%d: %s\n", | |
166 | partitioned ? "_d" : "", minor, | |
167 | md_setup_args[ent].device_names); | |
168 | ||
169 | fd = sys_open(name, 0, 0); | |
170 | if (fd < 0) { | |
171 | printk(KERN_ERR "md: open failed - cannot start " | |
172 | "array %s\n", name); | |
173 | continue; | |
174 | } | |
175 | if (sys_ioctl(fd, SET_ARRAY_INFO, 0) == -EBUSY) { | |
176 | printk(KERN_WARNING | |
177 | "md: Ignoring md=%d, already autodetected. (Use raid=noautodetect)\n", | |
178 | minor); | |
179 | sys_close(fd); | |
180 | continue; | |
181 | } | |
182 | ||
2604b703 | 183 | if (md_setup_args[ent].level != LEVEL_NONE) { |
1da177e4 LT |
184 | /* non-persistent */ |
185 | mdu_array_info_t ainfo; | |
2604b703 | 186 | ainfo.level = md_setup_args[ent].level; |
1da177e4 LT |
187 | ainfo.size = 0; |
188 | ainfo.nr_disks =0; | |
189 | ainfo.raid_disks =0; | |
190 | while (devices[ainfo.raid_disks]) | |
191 | ainfo.raid_disks++; | |
192 | ainfo.md_minor =minor; | |
193 | ainfo.not_persistent = 1; | |
194 | ||
195 | ainfo.state = (1 << MD_SB_CLEAN); | |
196 | ainfo.layout = 0; | |
197 | ainfo.chunk_size = md_setup_args[ent].chunk; | |
198 | err = sys_ioctl(fd, SET_ARRAY_INFO, (long)&ainfo); | |
199 | for (i = 0; !err && i <= MD_SB_DISKS; i++) { | |
200 | dev = devices[i]; | |
201 | if (!dev) | |
202 | break; | |
203 | dinfo.number = i; | |
204 | dinfo.raid_disk = i; | |
205 | dinfo.state = (1<<MD_DISK_ACTIVE)|(1<<MD_DISK_SYNC); | |
206 | dinfo.major = MAJOR(dev); | |
207 | dinfo.minor = MINOR(dev); | |
208 | err = sys_ioctl(fd, ADD_NEW_DISK, (long)&dinfo); | |
209 | } | |
210 | } else { | |
211 | /* persistent */ | |
212 | for (i = 0; i <= MD_SB_DISKS; i++) { | |
213 | dev = devices[i]; | |
214 | if (!dev) | |
215 | break; | |
216 | dinfo.major = MAJOR(dev); | |
217 | dinfo.minor = MINOR(dev); | |
218 | sys_ioctl(fd, ADD_NEW_DISK, (long)&dinfo); | |
219 | } | |
220 | } | |
221 | if (!err) | |
222 | err = sys_ioctl(fd, RUN_ARRAY, 0); | |
223 | if (err) | |
224 | printk(KERN_WARNING "md: starting md%d failed\n", minor); | |
225 | else { | |
226 | /* reread the partition table. | |
227 | * I (neilb) and not sure why this is needed, but I cannot | |
228 | * boot a kernel with devfs compiled in from partitioned md | |
229 | * array without it | |
230 | */ | |
231 | sys_close(fd); | |
232 | fd = sys_open(name, 0, 0); | |
233 | sys_ioctl(fd, BLKRRPART, 0); | |
234 | } | |
235 | sys_close(fd); | |
236 | } | |
237 | } | |
238 | ||
239 | static int __init raid_setup(char *str) | |
240 | { | |
241 | int len, pos; | |
242 | ||
243 | len = strlen(str) + 1; | |
244 | pos = 0; | |
245 | ||
246 | while (pos < len) { | |
247 | char *comma = strchr(str+pos, ','); | |
248 | int wlen; | |
249 | if (comma) | |
250 | wlen = (comma-str)-pos; | |
251 | else wlen = (len-1)-pos; | |
252 | ||
253 | if (!strncmp(str, "noautodetect", wlen)) | |
254 | raid_noautodetect = 1; | |
255 | if (strncmp(str, "partitionable", wlen)==0) | |
256 | raid_autopart = 1; | |
257 | if (strncmp(str, "part", wlen)==0) | |
258 | raid_autopart = 1; | |
259 | pos += wlen+1; | |
260 | } | |
261 | return 1; | |
262 | } | |
263 | ||
264 | __setup("raid=", raid_setup); | |
265 | __setup("md=", md_setup); | |
266 | ||
267 | void __init md_run_setup(void) | |
268 | { | |
bdaf8529 | 269 | create_dev("/dev/md0", MKDEV(MD_MAJOR, 0)); |
1da177e4 LT |
270 | if (raid_noautodetect) |
271 | printk(KERN_INFO "md: Skipping autodetection of RAID arrays. (raid=noautodetect)\n"); | |
272 | else { | |
273 | int fd = sys_open("/dev/md0", 0, 0); | |
274 | if (fd >= 0) { | |
275 | sys_ioctl(fd, RAID_AUTORUN, raid_autopart); | |
276 | sys_close(fd); | |
277 | } | |
278 | } | |
279 | md_setup_drive(); | |
280 | } |