tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
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linux
1// SPDX-License-Identifier: GPL-2.0
2/*
3 * Many of the syscalls used in this file expect some of the arguments
4 * to be __user pointers not __kernel pointers. To limit the sparse
5 * noise, turn off sparse checking for this file.
6 */
7#ifdef __CHECKER__
8#undef __CHECKER__
9#warning "Sparse checking disabled for this file"
10#endif
11
12#include <linux/delay.h>
13#include <linux/raid/md_u.h>
14#include <linux/raid/md_p.h>
15
16#include "do_mounts.h"
17
18/*
19 * When md (and any require personalities) are compiled into the kernel
20 * (not a module), arrays can be assembles are boot time using with AUTODETECT
21 * where specially marked partitions are registered with md_autodetect_dev(),
22 * and with MD_BOOT where devices to be collected are given on the boot line
23 * with md=.....
24 * The code for that is here.
25 */
26
27#ifdef CONFIG_MD_AUTODETECT
28static int __initdata raid_noautodetect;
29#else
30static int __initdata raid_noautodetect=1;
31#endif
32static int __initdata raid_autopart;
33
34static struct {
35 int minor;
36 int partitioned;
37 int level;
38 int chunk;
39 char *device_names;
40} md_setup_args[256] __initdata;
41
42static int md_setup_ents __initdata;
43
44/*
45 * Parse the command-line parameters given our kernel, but do not
46 * actually try to invoke the MD device now; that is handled by
47 * md_setup_drive after the low-level disk drivers have initialised.
48 *
49 * 27/11/1999: Fixed to work correctly with the 2.3 kernel (which
50 * assigns the task of parsing integer arguments to the
51 * invoked program now). Added ability to initialise all
52 * the MD devices (by specifying multiple "md=" lines)
53 * instead of just one. -- KTK
54 * 18May2000: Added support for persistent-superblock arrays:
55 * md=n,0,factor,fault,device-list uses RAID0 for device n
56 * md=n,-1,factor,fault,device-list uses LINEAR for device n
57 * md=n,device-list reads a RAID superblock from the devices
58 * elements in device-list are read by name_to_kdev_t so can be
59 * a hex number or something like /dev/hda1 /dev/sdb
60 * 2001-06-03: Dave Cinege <dcinege@psychosis.com>
61 * Shifted name_to_kdev_t() and related operations to md_set_drive()
62 * for later execution. Rewrote section to make devfs compatible.
63 */
64static int __init md_setup(char *str)
65{
66 int minor, level, factor, fault, partitioned = 0;
67 char *pername = "";
68 char *str1;
69 int ent;
70
71 if (*str == 'd') {
72 partitioned = 1;
73 str++;
74 }
75 if (get_option(&str, &minor) != 2) { /* MD Number */
76 printk(KERN_WARNING "md: Too few arguments supplied to md=.\n");
77 return 0;
78 }
79 str1 = str;
80 for (ent=0 ; ent< md_setup_ents ; ent++)
81 if (md_setup_args[ent].minor == minor &&
82 md_setup_args[ent].partitioned == partitioned) {
83 printk(KERN_WARNING "md: md=%s%d, Specified more than once. "
84 "Replacing previous definition.\n", partitioned?"d":"", minor);
85 break;
86 }
87 if (ent >= ARRAY_SIZE(md_setup_args)) {
88 printk(KERN_WARNING "md: md=%s%d - too many md initialisations\n", partitioned?"d":"", minor);
89 return 0;
90 }
91 if (ent >= md_setup_ents)
92 md_setup_ents++;
93 switch (get_option(&str, &level)) { /* RAID level */
94 case 2: /* could be 0 or -1.. */
95 if (level == 0 || level == LEVEL_LINEAR) {
96 if (get_option(&str, &factor) != 2 || /* Chunk Size */
97 get_option(&str, &fault) != 2) {
98 printk(KERN_WARNING "md: Too few arguments supplied to md=.\n");
99 return 0;
100 }
101 md_setup_args[ent].level = level;
102 md_setup_args[ent].chunk = 1 << (factor+12);
103 if (level == LEVEL_LINEAR)
104 pername = "linear";
105 else
106 pername = "raid0";
107 break;
108 }
109 /* FALL THROUGH */
110 case 1: /* the first device is numeric */
111 str = str1;
112 /* FALL THROUGH */
113 case 0:
114 md_setup_args[ent].level = LEVEL_NONE;
115 pername="super-block";
116 }
117
118 printk(KERN_INFO "md: Will configure md%d (%s) from %s, below.\n",
119 minor, pername, str);
120 md_setup_args[ent].device_names = str;
121 md_setup_args[ent].partitioned = partitioned;
122 md_setup_args[ent].minor = minor;
123
124 return 1;
125}
126
127static void __init md_setup_drive(void)
128{
129 int minor, i, ent, partitioned;
130 dev_t dev;
131 dev_t devices[MD_SB_DISKS+1];
132
133 for (ent = 0; ent < md_setup_ents ; ent++) {
134 int fd;
135 int err = 0;
136 char *devname;
137 mdu_disk_info_t dinfo;
138 char name[16];
139
140 minor = md_setup_args[ent].minor;
141 partitioned = md_setup_args[ent].partitioned;
142 devname = md_setup_args[ent].device_names;
143
144 sprintf(name, "/dev/md%s%d", partitioned?"_d":"", minor);
145 if (partitioned)
146 dev = MKDEV(mdp_major, minor << MdpMinorShift);
147 else
148 dev = MKDEV(MD_MAJOR, minor);
149 create_dev(name, dev);
150 for (i = 0; i < MD_SB_DISKS && devname != NULL; i++) {
151 char *p;
152 char comp_name[64];
153 u32 rdev;
154
155 p = strchr(devname, ',');
156 if (p)
157 *p++ = 0;
158
159 dev = name_to_dev_t(devname);
160 if (strncmp(devname, "/dev/", 5) == 0)
161 devname += 5;
162 snprintf(comp_name, 63, "/dev/%s", devname);
163 rdev = bstat(comp_name);
164 if (rdev)
165 dev = new_decode_dev(rdev);
166 if (!dev) {
167 printk(KERN_WARNING "md: Unknown device name: %s\n", devname);
168 break;
169 }
170
171 devices[i] = dev;
172
173 devname = p;
174 }
175 devices[i] = 0;
176
177 if (!i)
178 continue;
179
180 printk(KERN_INFO "md: Loading md%s%d: %s\n",
181 partitioned ? "_d" : "", minor,
182 md_setup_args[ent].device_names);
183
184 fd = sys_open(name, 0, 0);
185 if (fd < 0) {
186 printk(KERN_ERR "md: open failed - cannot start "
187 "array %s\n", name);
188 continue;
189 }
190 if (sys_ioctl(fd, SET_ARRAY_INFO, 0) == -EBUSY) {
191 printk(KERN_WARNING
192 "md: Ignoring md=%d, already autodetected. (Use raid=noautodetect)\n",
193 minor);
194 sys_close(fd);
195 continue;
196 }
197
198 if (md_setup_args[ent].level != LEVEL_NONE) {
199 /* non-persistent */
200 mdu_array_info_t ainfo;
201 ainfo.level = md_setup_args[ent].level;
202 ainfo.size = 0;
203 ainfo.nr_disks =0;
204 ainfo.raid_disks =0;
205 while (devices[ainfo.raid_disks])
206 ainfo.raid_disks++;
207 ainfo.md_minor =minor;
208 ainfo.not_persistent = 1;
209
210 ainfo.state = (1 << MD_SB_CLEAN);
211 ainfo.layout = 0;
212 ainfo.chunk_size = md_setup_args[ent].chunk;
213 err = sys_ioctl(fd, SET_ARRAY_INFO, (long)&ainfo);
214 for (i = 0; !err && i <= MD_SB_DISKS; i++) {
215 dev = devices[i];
216 if (!dev)
217 break;
218 dinfo.number = i;
219 dinfo.raid_disk = i;
220 dinfo.state = (1<<MD_DISK_ACTIVE)|(1<<MD_DISK_SYNC);
221 dinfo.major = MAJOR(dev);
222 dinfo.minor = MINOR(dev);
223 err = sys_ioctl(fd, ADD_NEW_DISK, (long)&dinfo);
224 }
225 } else {
226 /* persistent */
227 for (i = 0; i <= MD_SB_DISKS; i++) {
228 dev = devices[i];
229 if (!dev)
230 break;
231 dinfo.major = MAJOR(dev);
232 dinfo.minor = MINOR(dev);
233 sys_ioctl(fd, ADD_NEW_DISK, (long)&dinfo);
234 }
235 }
236 if (!err)
237 err = sys_ioctl(fd, RUN_ARRAY, 0);
238 if (err)
239 printk(KERN_WARNING "md: starting md%d failed\n", minor);
240 else {
241 /* reread the partition table.
242 * I (neilb) and not sure why this is needed, but I cannot
243 * boot a kernel with devfs compiled in from partitioned md
244 * array without it
245 */
246 sys_close(fd);
247 fd = sys_open(name, 0, 0);
248 sys_ioctl(fd, BLKRRPART, 0);
249 }
250 sys_close(fd);
251 }
252}
253
254static int __init raid_setup(char *str)
255{
256 int len, pos;
257
258 len = strlen(str) + 1;
259 pos = 0;
260
261 while (pos < len) {
262 char *comma = strchr(str+pos, ',');
263 int wlen;
264 if (comma)
265 wlen = (comma-str)-pos;
266 else wlen = (len-1)-pos;
267
268 if (!strncmp(str, "noautodetect", wlen))
269 raid_noautodetect = 1;
270 if (!strncmp(str, "autodetect", wlen))
271 raid_noautodetect = 0;
272 if (strncmp(str, "partitionable", wlen)==0)
273 raid_autopart = 1;
274 if (strncmp(str, "part", wlen)==0)
275 raid_autopart = 1;
276 pos += wlen+1;
277 }
278 return 1;
279}
280
281__setup("raid=", raid_setup);
282__setup("md=", md_setup);
283
284static void __init autodetect_raid(void)
285{
286 int fd;
287
288 /*
289 * Since we don't want to detect and use half a raid array, we need to
290 * wait for the known devices to complete their probing
291 */
292 printk(KERN_INFO "md: Waiting for all devices to be available before autodetect\n");
293 printk(KERN_INFO "md: If you don't use raid, use raid=noautodetect\n");
294
295 wait_for_device_probe();
296
297 fd = sys_open("/dev/md0", 0, 0);
298 if (fd >= 0) {
299 sys_ioctl(fd, RAID_AUTORUN, raid_autopart);
300 sys_close(fd);
301 }
302}
303
304void __init md_run_setup(void)
305{
306 create_dev("/dev/md0", MKDEV(MD_MAJOR, 0));
307
308 if (raid_noautodetect)
309 printk(KERN_INFO "md: Skipping autodetection of RAID arrays. (raid=autodetect will force)\n");
310 else
311 autodetect_raid();
312 md_setup_drive();
313}