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1 | #include <linux/delay.h> |
2 | #include <linux/raid/md_u.h> |
3 | #include <linux/raid/md_p.h> |
4 | |
5 | #include "do_mounts.h" |
6 | |
7 | /* |
8 | * When md (and any require personalities) are compiled into the kernel |
9 | * (not a module), arrays can be assembles are boot time using with AUTODETECT |
10 | * where specially marked partitions are registered with md_autodetect_dev(), |
11 | * and with MD_BOOT where devices to be collected are given on the boot line |
12 | * with md=..... |
13 | * The code for that is here. |
14 | */ |
15 | |
16 | #ifdef CONFIG_MD_AUTODETECT |
17 | static int __initdata raid_noautodetect; |
18 | #else |
19 | static int __initdata raid_noautodetect=1; |
20 | #endif |
21 | static int __initdata raid_autopart; |
22 | |
23 | static struct { |
24 | int minor; |
25 | int partitioned; |
26 | int level; |
27 | int chunk; |
28 | char *device_names; |
29 | } md_setup_args[256] __initdata; |
30 | |
31 | static int md_setup_ents __initdata; |
32 | |
33 | /* |
34 | * Parse the command-line parameters given our kernel, but do not |
35 | * actually try to invoke the MD device now; that is handled by |
36 | * md_setup_drive after the low-level disk drivers have initialised. |
37 | * |
38 | * 27/11/1999: Fixed to work correctly with the 2.3 kernel (which |
39 | * assigns the task of parsing integer arguments to the |
40 | * invoked program now). Added ability to initialise all |
41 | * the MD devices (by specifying multiple "md=" lines) |
42 | * instead of just one. -- KTK |
43 | * 18May2000: Added support for persistent-superblock arrays: |
44 | * md=n,0,factor,fault,device-list uses RAID0 for device n |
45 | * md=n,-1,factor,fault,device-list uses LINEAR for device n |
46 | * md=n,device-list reads a RAID superblock from the devices |
47 | * elements in device-list are read by name_to_kdev_t so can be |
48 | * a hex number or something like /dev/hda1 /dev/sdb |
49 | * 2001-06-03: Dave Cinege <dcinege@psychosis.com> |
50 | * Shifted name_to_kdev_t() and related operations to md_set_drive() |
51 | * for later execution. Rewrote section to make devfs compatible. |
52 | */ |
53 | static int __init md_setup(char *str) |
54 | { |
55 | int minor, level, factor, fault, partitioned = 0; |
56 | char *pername = ""; |
57 | char *str1; |
58 | int ent; |
59 | |
60 | if (*str == 'd') { |
61 | partitioned = 1; |
62 | str++; |
63 | } |
64 | if (get_option(&str, &minor) != 2) { /* MD Number */ |
65 | printk(KERN_WARNING "md: Too few arguments supplied to md=.\n"); |
66 | return 0; |
67 | } |
68 | str1 = str; |
69 | for (ent=0 ; ent< md_setup_ents ; ent++) |
70 | if (md_setup_args[ent].minor == minor && |
71 | md_setup_args[ent].partitioned == partitioned) { |
72 | printk(KERN_WARNING "md: md=%s%d, Specified more than once. " |
73 | "Replacing previous definition.\n", partitioned?"d":"", minor); |
74 | break; |
75 | } |
76 | if (ent >= ARRAY_SIZE(md_setup_args)) { |
77 | printk(KERN_WARNING "md: md=%s%d - too many md initialisations\n", partitioned?"d":"", minor); |
78 | return 0; |
79 | } |
80 | if (ent >= md_setup_ents) |
81 | md_setup_ents++; |
82 | switch (get_option(&str, &level)) { /* RAID level */ |
83 | case 2: /* could be 0 or -1.. */ |
84 | if (level == 0 || level == LEVEL_LINEAR) { |
85 | if (get_option(&str, &factor) != 2 || /* Chunk Size */ |
86 | get_option(&str, &fault) != 2) { |
87 | printk(KERN_WARNING "md: Too few arguments supplied to md=.\n"); |
88 | return 0; |
89 | } |
90 | md_setup_args[ent].level = level; |
91 | md_setup_args[ent].chunk = 1 << (factor+12); |
92 | if (level == LEVEL_LINEAR) |
93 | pername = "linear"; |
94 | else |
95 | pername = "raid0"; |
96 | break; |
97 | } |
98 | /* FALL THROUGH */ |
99 | case 1: /* the first device is numeric */ |
100 | str = str1; |
101 | /* FALL THROUGH */ |
102 | case 0: |
103 | md_setup_args[ent].level = LEVEL_NONE; |
104 | pername="super-block"; |
105 | } |
106 | |
107 | printk(KERN_INFO "md: Will configure md%d (%s) from %s, below.\n", |
108 | minor, pername, str); |
109 | md_setup_args[ent].device_names = str; |
110 | md_setup_args[ent].partitioned = partitioned; |
111 | md_setup_args[ent].minor = minor; |
112 | |
113 | return 1; |
114 | } |
115 | |
116 | static void __init md_setup_drive(void) |
117 | { |
118 | int minor, i, ent, partitioned; |
119 | dev_t dev; |
120 | dev_t devices[MD_SB_DISKS+1]; |
121 | |
122 | for (ent = 0; ent < md_setup_ents ; ent++) { |
123 | int fd; |
124 | int err = 0; |
125 | char *devname; |
126 | mdu_disk_info_t dinfo; |
127 | char name[16]; |
128 | |
129 | minor = md_setup_args[ent].minor; |
130 | partitioned = md_setup_args[ent].partitioned; |
131 | devname = md_setup_args[ent].device_names; |
132 | |
133 | sprintf(name, "/dev/md%s%d", partitioned?"_d":"", minor); |
134 | if (partitioned) |
135 | dev = MKDEV(mdp_major, minor << MdpMinorShift); |
136 | else |
137 | dev = MKDEV(MD_MAJOR, minor); |
138 | create_dev(name, dev); |
139 | for (i = 0; i < MD_SB_DISKS && devname != NULL; i++) { |
140 | char *p; |
141 | char comp_name[64]; |
142 | u32 rdev; |
143 | |
144 | p = strchr(devname, ','); |
145 | if (p) |
146 | *p++ = 0; |
147 | |
148 | dev = name_to_dev_t(devname); |
149 | if (strncmp(devname, "/dev/", 5) == 0) |
150 | devname += 5; |
151 | snprintf(comp_name, 63, "/dev/%s", devname); |
152 | rdev = bstat(comp_name); |
153 | if (rdev) |
154 | dev = new_decode_dev(rdev); |
155 | if (!dev) { |
156 | printk(KERN_WARNING "md: Unknown device name: %s\n", devname); |
157 | break; |
158 | } |
159 | |
160 | devices[i] = dev; |
161 | |
162 | devname = p; |
163 | } |
164 | devices[i] = 0; |
165 | |
166 | if (!i) |
167 | continue; |
168 | |
169 | printk(KERN_INFO "md: Loading md%s%d: %s\n", |
170 | partitioned ? "_d" : "", minor, |
171 | md_setup_args[ent].device_names); |
172 | |
173 | fd = sys_open(name, 0, 0); |
174 | if (fd < 0) { |
175 | printk(KERN_ERR "md: open failed - cannot start " |
176 | "array %s\n", name); |
177 | continue; |
178 | } |
179 | if (sys_ioctl(fd, SET_ARRAY_INFO, 0) == -EBUSY) { |
180 | printk(KERN_WARNING |
181 | "md: Ignoring md=%d, already autodetected. (Use raid=noautodetect)\n", |
182 | minor); |
183 | sys_close(fd); |
184 | continue; |
185 | } |
186 | |
187 | if (md_setup_args[ent].level != LEVEL_NONE) { |
188 | /* non-persistent */ |
189 | mdu_array_info_t ainfo; |
190 | ainfo.level = md_setup_args[ent].level; |
191 | ainfo.size = 0; |
192 | ainfo.nr_disks =0; |
193 | ainfo.raid_disks =0; |
194 | while (devices[ainfo.raid_disks]) |
195 | ainfo.raid_disks++; |
196 | ainfo.md_minor =minor; |
197 | ainfo.not_persistent = 1; |
198 | |
199 | ainfo.state = (1 << MD_SB_CLEAN); |
200 | ainfo.layout = 0; |
201 | ainfo.chunk_size = md_setup_args[ent].chunk; |
202 | err = sys_ioctl(fd, SET_ARRAY_INFO, (long)&ainfo); |
203 | for (i = 0; !err && i <= MD_SB_DISKS; i++) { |
204 | dev = devices[i]; |
205 | if (!dev) |
206 | break; |
207 | dinfo.number = i; |
208 | dinfo.raid_disk = i; |
209 | dinfo.state = (1<<MD_DISK_ACTIVE)|(1<<MD_DISK_SYNC); |
210 | dinfo.major = MAJOR(dev); |
211 | dinfo.minor = MINOR(dev); |
212 | err = sys_ioctl(fd, ADD_NEW_DISK, (long)&dinfo); |
213 | } |
214 | } else { |
215 | /* persistent */ |
216 | for (i = 0; i <= MD_SB_DISKS; i++) { |
217 | dev = devices[i]; |
218 | if (!dev) |
219 | break; |
220 | dinfo.major = MAJOR(dev); |
221 | dinfo.minor = MINOR(dev); |
222 | sys_ioctl(fd, ADD_NEW_DISK, (long)&dinfo); |
223 | } |
224 | } |
225 | if (!err) |
226 | err = sys_ioctl(fd, RUN_ARRAY, 0); |
227 | if (err) |
228 | printk(KERN_WARNING "md: starting md%d failed\n", minor); |
229 | else { |
230 | /* reread the partition table. |
231 | * I (neilb) and not sure why this is needed, but I cannot |
232 | * boot a kernel with devfs compiled in from partitioned md |
233 | * array without it |
234 | */ |
235 | sys_close(fd); |
236 | fd = sys_open(name, 0, 0); |
237 | sys_ioctl(fd, BLKRRPART, 0); |
238 | } |
239 | sys_close(fd); |
240 | } |
241 | } |
242 | |
243 | static int __init raid_setup(char *str) |
244 | { |
245 | int len, pos; |
246 | |
247 | len = strlen(str) + 1; |
248 | pos = 0; |
249 | |
250 | while (pos < len) { |
251 | char *comma = strchr(str+pos, ','); |
252 | int wlen; |
253 | if (comma) |
254 | wlen = (comma-str)-pos; |
255 | else wlen = (len-1)-pos; |
256 | |
257 | if (!strncmp(str, "noautodetect", wlen)) |
258 | raid_noautodetect = 1; |
259 | if (!strncmp(str, "autodetect", wlen)) |
260 | raid_noautodetect = 0; |
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 | |
273 | static void __init autodetect_raid(void) |
274 | { |
275 | int fd; |
276 | |
277 | /* |
278 | * Since we don't want to detect and use half a raid array, we need to |
279 | * wait for the known devices to complete their probing |
280 | */ |
281 | printk(KERN_INFO "md: Waiting for all devices to be available before autodetect\n"); |
282 | printk(KERN_INFO "md: If you don't use raid, use raid=noautodetect\n"); |
283 | |
284 | wait_for_device_probe(); |
285 | |
286 | fd = sys_open((const char __user __force *) "/dev/md0", 0, 0); |
287 | if (fd >= 0) { |
288 | sys_ioctl(fd, RAID_AUTORUN, raid_autopart); |
289 | sys_close(fd); |
290 | } |
291 | } |
292 | |
293 | void __init md_run_setup(void) |
294 | { |
295 | create_dev("/dev/md0", MKDEV(MD_MAJOR, 0)); |
296 | |
297 | if (raid_noautodetect) |
298 | printk(KERN_INFO "md: Skipping autodetection of RAID arrays. (raid=autodetect will force)\n"); |
299 | else |
300 | autodetect_raid(); |
301 | md_setup_drive(); |
302 | } |
303 |
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