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1 | /* |
2 | * Many of the syscalls used in this file expect some of the arguments |
3 | * to be __user pointers not __kernel pointers. To limit the sparse |
4 | * noise, turn off sparse checking for this file. |
5 | */ |
6 | #ifdef __CHECKER__ |
7 | #undef __CHECKER__ |
8 | #warning "Sparse checking disabled for this file" |
9 | #endif |
10 | |
11 | #include <linux/delay.h> |
12 | #include <linux/raid/md_u.h> |
13 | #include <linux/raid/md_p.h> |
14 | |
15 | #include "do_mounts.h" |
16 | |
17 | /* |
18 | * When md (and any require personalities) are compiled into the kernel |
19 | * (not a module), arrays can be assembles are boot time using with AUTODETECT |
20 | * where specially marked partitions are registered with md_autodetect_dev(), |
21 | * and with MD_BOOT where devices to be collected are given on the boot line |
22 | * with md=..... |
23 | * The code for that is here. |
24 | */ |
25 | |
26 | #ifdef CONFIG_MD_AUTODETECT |
27 | static int __initdata raid_noautodetect; |
28 | #else |
29 | static int __initdata raid_noautodetect=1; |
30 | #endif |
31 | static int __initdata raid_autopart; |
32 | |
33 | static struct { |
34 | int minor; |
35 | int partitioned; |
36 | int level; |
37 | int chunk; |
38 | char *device_names; |
39 | } md_setup_args[256] __initdata; |
40 | |
41 | static int md_setup_ents __initdata; |
42 | |
43 | /* |
44 | * Parse the command-line parameters given our kernel, but do not |
45 | * actually try to invoke the MD device now; that is handled by |
46 | * md_setup_drive after the low-level disk drivers have initialised. |
47 | * |
48 | * 27/11/1999: Fixed to work correctly with the 2.3 kernel (which |
49 | * assigns the task of parsing integer arguments to the |
50 | * invoked program now). Added ability to initialise all |
51 | * the MD devices (by specifying multiple "md=" lines) |
52 | * instead of just one. -- KTK |
53 | * 18May2000: Added support for persistent-superblock arrays: |
54 | * md=n,0,factor,fault,device-list uses RAID0 for device n |
55 | * md=n,-1,factor,fault,device-list uses LINEAR for device n |
56 | * md=n,device-list reads a RAID superblock from the devices |
57 | * elements in device-list are read by name_to_kdev_t so can be |
58 | * a hex number or something like /dev/hda1 /dev/sdb |
59 | * 2001-06-03: Dave Cinege <dcinege@psychosis.com> |
60 | * Shifted name_to_kdev_t() and related operations to md_set_drive() |
61 | * for later execution. Rewrote section to make devfs compatible. |
62 | */ |
63 | static int __init md_setup(char *str) |
64 | { |
65 | int minor, level, factor, fault, partitioned = 0; |
66 | char *pername = ""; |
67 | char *str1; |
68 | int ent; |
69 | |
70 | if (*str == 'd') { |
71 | partitioned = 1; |
72 | str++; |
73 | } |
74 | if (get_option(&str, &minor) != 2) { /* MD Number */ |
75 | printk(KERN_WARNING "md: Too few arguments supplied to md=.\n"); |
76 | return 0; |
77 | } |
78 | str1 = str; |
79 | for (ent=0 ; ent< md_setup_ents ; ent++) |
80 | if (md_setup_args[ent].minor == minor && |
81 | md_setup_args[ent].partitioned == partitioned) { |
82 | printk(KERN_WARNING "md: md=%s%d, Specified more than once. " |
83 | "Replacing previous definition.\n", partitioned?"d":"", minor); |
84 | break; |
85 | } |
86 | if (ent >= ARRAY_SIZE(md_setup_args)) { |
87 | printk(KERN_WARNING "md: md=%s%d - too many md initialisations\n", partitioned?"d":"", minor); |
88 | return 0; |
89 | } |
90 | if (ent >= md_setup_ents) |
91 | md_setup_ents++; |
92 | switch (get_option(&str, &level)) { /* RAID level */ |
93 | case 2: /* could be 0 or -1.. */ |
94 | if (level == 0 || level == LEVEL_LINEAR) { |
95 | if (get_option(&str, &factor) != 2 || /* Chunk Size */ |
96 | get_option(&str, &fault) != 2) { |
97 | printk(KERN_WARNING "md: Too few arguments supplied to md=.\n"); |
98 | return 0; |
99 | } |
100 | md_setup_args[ent].level = level; |
101 | md_setup_args[ent].chunk = 1 << (factor+12); |
102 | if (level == LEVEL_LINEAR) |
103 | pername = "linear"; |
104 | else |
105 | pername = "raid0"; |
106 | break; |
107 | } |
108 | /* FALL THROUGH */ |
109 | case 1: /* the first device is numeric */ |
110 | str = str1; |
111 | /* FALL THROUGH */ |
112 | case 0: |
113 | md_setup_args[ent].level = LEVEL_NONE; |
114 | pername="super-block"; |
115 | } |
116 | |
117 | printk(KERN_INFO "md: Will configure md%d (%s) from %s, below.\n", |
118 | minor, pername, str); |
119 | md_setup_args[ent].device_names = str; |
120 | md_setup_args[ent].partitioned = partitioned; |
121 | md_setup_args[ent].minor = minor; |
122 | |
123 | return 1; |
124 | } |
125 | |
126 | static void __init md_setup_drive(void) |
127 | { |
128 | int minor, i, ent, partitioned; |
129 | dev_t dev; |
130 | dev_t devices[MD_SB_DISKS+1]; |
131 | |
132 | for (ent = 0; ent < md_setup_ents ; ent++) { |
133 | int fd; |
134 | int err = 0; |
135 | char *devname; |
136 | mdu_disk_info_t dinfo; |
137 | char name[16]; |
138 | |
139 | minor = md_setup_args[ent].minor; |
140 | partitioned = md_setup_args[ent].partitioned; |
141 | devname = md_setup_args[ent].device_names; |
142 | |
143 | sprintf(name, "/dev/md%s%d", partitioned?"_d":"", minor); |
144 | if (partitioned) |
145 | dev = MKDEV(mdp_major, minor << MdpMinorShift); |
146 | else |
147 | dev = MKDEV(MD_MAJOR, minor); |
148 | create_dev(name, dev); |
149 | for (i = 0; i < MD_SB_DISKS && devname != NULL; i++) { |
150 | char *p; |
151 | char comp_name[64]; |
152 | u32 rdev; |
153 | |
154 | p = strchr(devname, ','); |
155 | if (p) |
156 | *p++ = 0; |
157 | |
158 | dev = name_to_dev_t(devname); |
159 | if (strncmp(devname, "/dev/", 5) == 0) |
160 | devname += 5; |
161 | snprintf(comp_name, 63, "/dev/%s", devname); |
162 | rdev = bstat(comp_name); |
163 | if (rdev) |
164 | dev = new_decode_dev(rdev); |
165 | if (!dev) { |
166 | printk(KERN_WARNING "md: Unknown device name: %s\n", devname); |
167 | break; |
168 | } |
169 | |
170 | devices[i] = dev; |
171 | |
172 | devname = p; |
173 | } |
174 | devices[i] = 0; |
175 | |
176 | if (!i) |
177 | continue; |
178 | |
179 | printk(KERN_INFO "md: Loading md%s%d: %s\n", |
180 | partitioned ? "_d" : "", minor, |
181 | md_setup_args[ent].device_names); |
182 | |
183 | fd = sys_open(name, 0, 0); |
184 | if (fd < 0) { |
185 | printk(KERN_ERR "md: open failed - cannot start " |
186 | "array %s\n", name); |
187 | continue; |
188 | } |
189 | if (sys_ioctl(fd, SET_ARRAY_INFO, 0) == -EBUSY) { |
190 | printk(KERN_WARNING |
191 | "md: Ignoring md=%d, already autodetected. (Use raid=noautodetect)\n", |
192 | minor); |
193 | sys_close(fd); |
194 | continue; |
195 | } |
196 | |
197 | if (md_setup_args[ent].level != LEVEL_NONE) { |
198 | /* non-persistent */ |
199 | mdu_array_info_t ainfo; |
200 | ainfo.level = md_setup_args[ent].level; |
201 | ainfo.size = 0; |
202 | ainfo.nr_disks =0; |
203 | ainfo.raid_disks =0; |
204 | while (devices[ainfo.raid_disks]) |
205 | ainfo.raid_disks++; |
206 | ainfo.md_minor =minor; |
207 | ainfo.not_persistent = 1; |
208 | |
209 | ainfo.state = (1 << MD_SB_CLEAN); |
210 | ainfo.layout = 0; |
211 | ainfo.chunk_size = md_setup_args[ent].chunk; |
212 | err = sys_ioctl(fd, SET_ARRAY_INFO, (long)&ainfo); |
213 | for (i = 0; !err && i <= MD_SB_DISKS; i++) { |
214 | dev = devices[i]; |
215 | if (!dev) |
216 | break; |
217 | dinfo.number = i; |
218 | dinfo.raid_disk = i; |
219 | dinfo.state = (1<<MD_DISK_ACTIVE)|(1<<MD_DISK_SYNC); |
220 | dinfo.major = MAJOR(dev); |
221 | dinfo.minor = MINOR(dev); |
222 | err = sys_ioctl(fd, ADD_NEW_DISK, (long)&dinfo); |
223 | } |
224 | } else { |
225 | /* persistent */ |
226 | for (i = 0; i <= MD_SB_DISKS; i++) { |
227 | dev = devices[i]; |
228 | if (!dev) |
229 | break; |
230 | dinfo.major = MAJOR(dev); |
231 | dinfo.minor = MINOR(dev); |
232 | sys_ioctl(fd, ADD_NEW_DISK, (long)&dinfo); |
233 | } |
234 | } |
235 | if (!err) |
236 | err = sys_ioctl(fd, RUN_ARRAY, 0); |
237 | if (err) |
238 | printk(KERN_WARNING "md: starting md%d failed\n", minor); |
239 | else { |
240 | /* reread the partition table. |
241 | * I (neilb) and not sure why this is needed, but I cannot |
242 | * boot a kernel with devfs compiled in from partitioned md |
243 | * array without it |
244 | */ |
245 | sys_close(fd); |
246 | fd = sys_open(name, 0, 0); |
247 | sys_ioctl(fd, BLKRRPART, 0); |
248 | } |
249 | sys_close(fd); |
250 | } |
251 | } |
252 | |
253 | static int __init raid_setup(char *str) |
254 | { |
255 | int len, pos; |
256 | |
257 | len = strlen(str) + 1; |
258 | pos = 0; |
259 | |
260 | while (pos < len) { |
261 | char *comma = strchr(str+pos, ','); |
262 | int wlen; |
263 | if (comma) |
264 | wlen = (comma-str)-pos; |
265 | else wlen = (len-1)-pos; |
266 | |
267 | if (!strncmp(str, "noautodetect", wlen)) |
268 | raid_noautodetect = 1; |
269 | if (!strncmp(str, "autodetect", wlen)) |
270 | raid_noautodetect = 0; |
271 | if (strncmp(str, "partitionable", wlen)==0) |
272 | raid_autopart = 1; |
273 | if (strncmp(str, "part", wlen)==0) |
274 | raid_autopart = 1; |
275 | pos += wlen+1; |
276 | } |
277 | return 1; |
278 | } |
279 | |
280 | __setup("raid=", raid_setup); |
281 | __setup("md=", md_setup); |
282 | |
283 | static void __init autodetect_raid(void) |
284 | { |
285 | int fd; |
286 | |
287 | /* |
288 | * Since we don't want to detect and use half a raid array, we need to |
289 | * wait for the known devices to complete their probing |
290 | */ |
291 | printk(KERN_INFO "md: Waiting for all devices to be available before autodetect\n"); |
292 | printk(KERN_INFO "md: If you don't use raid, use raid=noautodetect\n"); |
293 | |
294 | wait_for_device_probe(); |
295 | |
296 | fd = sys_open("/dev/md0", 0, 0); |
297 | if (fd >= 0) { |
298 | sys_ioctl(fd, RAID_AUTORUN, raid_autopart); |
299 | sys_close(fd); |
300 | } |
301 | } |
302 | |
303 | void __init md_run_setup(void) |
304 | { |
305 | create_dev("/dev/md0", MKDEV(MD_MAJOR, 0)); |
306 | |
307 | if (raid_noautodetect) |
308 | printk(KERN_INFO "md: Skipping autodetection of RAID arrays. (raid=autodetect will force)\n"); |
309 | else |
310 | autodetect_raid(); |
311 | md_setup_drive(); |
312 | } |
313 |
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