Merge tag 'xtensa-20190510' of git://github.com/jcmvbkbc/linux-xtensa
[sfrench/cifs-2.6.git] / init / do_mounts_md.c
1 // SPDX-License-Identifier: GPL-2.0
2 #include <linux/delay.h>
3 #include <linux/raid/md_u.h>
4 #include <linux/raid/md_p.h>
5
6 #include "do_mounts.h"
7
8 /*
9  * When md (and any require personalities) are compiled into the kernel
10  * (not a module), arrays can be assembles are boot time using with AUTODETECT
11  * where specially marked partitions are registered with md_autodetect_dev(),
12  * and with MD_BOOT where devices to be collected are given on the boot line
13  * with md=.....
14  * The code for that is here.
15  */
16
17 #ifdef CONFIG_MD_AUTODETECT
18 static int __initdata raid_noautodetect;
19 #else
20 static int __initdata raid_noautodetect=1;
21 #endif
22 static int __initdata raid_autopart;
23
24 static struct {
25         int minor;
26         int partitioned;
27         int level;
28         int chunk;
29         char *device_names;
30 } md_setup_args[256] __initdata;
31
32 static int md_setup_ents __initdata;
33
34 /*
35  * Parse the command-line parameters given our kernel, but do not
36  * actually try to invoke the MD device now; that is handled by
37  * md_setup_drive after the low-level disk drivers have initialised.
38  *
39  * 27/11/1999: Fixed to work correctly with the 2.3 kernel (which
40  *             assigns the task of parsing integer arguments to the
41  *             invoked program now).  Added ability to initialise all
42  *             the MD devices (by specifying multiple "md=" lines)
43  *             instead of just one.  -- KTK
44  * 18May2000: Added support for persistent-superblock arrays:
45  *             md=n,0,factor,fault,device-list   uses RAID0 for device n
46  *             md=n,-1,factor,fault,device-list  uses LINEAR for device n
47  *             md=n,device-list      reads a RAID superblock from the devices
48  *             elements in device-list are read by name_to_kdev_t so can be
49  *             a hex number or something like /dev/hda1 /dev/sdb
50  * 2001-06-03: Dave Cinege <dcinege@psychosis.com>
51  *              Shifted name_to_kdev_t() and related operations to md_set_drive()
52  *              for later execution. Rewrote section to make devfs compatible.
53  */
54 static int __init md_setup(char *str)
55 {
56         int minor, level, factor, fault, partitioned = 0;
57         char *pername = "";
58         char *str1;
59         int ent;
60
61         if (*str == 'd') {
62                 partitioned = 1;
63                 str++;
64         }
65         if (get_option(&str, &minor) != 2) {    /* MD Number */
66                 printk(KERN_WARNING "md: Too few arguments supplied to md=.\n");
67                 return 0;
68         }
69         str1 = str;
70         for (ent=0 ; ent< md_setup_ents ; ent++)
71                 if (md_setup_args[ent].minor == minor &&
72                     md_setup_args[ent].partitioned == partitioned) {
73                         printk(KERN_WARNING "md: md=%s%d, Specified more than once. "
74                                "Replacing previous definition.\n", partitioned?"d":"", minor);
75                         break;
76                 }
77         if (ent >= ARRAY_SIZE(md_setup_args)) {
78                 printk(KERN_WARNING "md: md=%s%d - too many md initialisations\n", partitioned?"d":"", minor);
79                 return 0;
80         }
81         if (ent >= md_setup_ents)
82                 md_setup_ents++;
83         switch (get_option(&str, &level)) {     /* RAID level */
84         case 2: /* could be 0 or -1.. */
85                 if (level == 0 || level == LEVEL_LINEAR) {
86                         if (get_option(&str, &factor) != 2 ||   /* Chunk Size */
87                                         get_option(&str, &fault) != 2) {
88                                 printk(KERN_WARNING "md: Too few arguments supplied to md=.\n");
89                                 return 0;
90                         }
91                         md_setup_args[ent].level = level;
92                         md_setup_args[ent].chunk = 1 << (factor+12);
93                         if (level ==  LEVEL_LINEAR)
94                                 pername = "linear";
95                         else
96                                 pername = "raid0";
97                         break;
98                 }
99                 /* FALL THROUGH */
100         case 1: /* the first device is numeric */
101                 str = str1;
102                 /* FALL THROUGH */
103         case 0:
104                 md_setup_args[ent].level = LEVEL_NONE;
105                 pername="super-block";
106         }
107
108         printk(KERN_INFO "md: Will configure md%d (%s) from %s, below.\n",
109                 minor, pername, str);
110         md_setup_args[ent].device_names = str;
111         md_setup_args[ent].partitioned = partitioned;
112         md_setup_args[ent].minor = minor;
113
114         return 1;
115 }
116
117 static 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];
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                 if (partitioned)
136                         dev = MKDEV(mdp_major, minor << MdpMinorShift);
137                 else
138                         dev = MKDEV(MD_MAJOR, minor);
139                 create_dev(name, dev);
140                 for (i = 0; i < MD_SB_DISKS && devname != NULL; i++) {
141                         char *p;
142                         char comp_name[64];
143                         u32 rdev;
144
145                         p = strchr(devname, ',');
146                         if (p)
147                                 *p++ = 0;
148
149                         dev = name_to_dev_t(devname);
150                         if (strncmp(devname, "/dev/", 5) == 0)
151                                 devname += 5;
152                         snprintf(comp_name, 63, "/dev/%s", devname);
153                         rdev = bstat(comp_name);
154                         if (rdev)
155                                 dev = new_decode_dev(rdev);
156                         if (!dev) {
157                                 printk(KERN_WARNING "md: Unknown device name: %s\n", devname);
158                                 break;
159                         }
160
161                         devices[i] = dev;
162
163                         devname = p;
164                 }
165                 devices[i] = 0;
166
167                 if (!i)
168                         continue;
169
170                 printk(KERN_INFO "md: Loading md%s%d: %s\n",
171                         partitioned ? "_d" : "", minor,
172                         md_setup_args[ent].device_names);
173
174                 fd = ksys_open(name, 0, 0);
175                 if (fd < 0) {
176                         printk(KERN_ERR "md: open failed - cannot start "
177                                         "array %s\n", name);
178                         continue;
179                 }
180                 if (ksys_ioctl(fd, SET_ARRAY_INFO, 0) == -EBUSY) {
181                         printk(KERN_WARNING
182                                "md: Ignoring md=%d, already autodetected. (Use raid=noautodetect)\n",
183                                minor);
184                         ksys_close(fd);
185                         continue;
186                 }
187
188                 if (md_setup_args[ent].level != LEVEL_NONE) {
189                         /* non-persistent */
190                         mdu_array_info_t ainfo;
191                         ainfo.level = md_setup_args[ent].level;
192                         ainfo.size = 0;
193                         ainfo.nr_disks =0;
194                         ainfo.raid_disks =0;
195                         while (devices[ainfo.raid_disks])
196                                 ainfo.raid_disks++;
197                         ainfo.md_minor =minor;
198                         ainfo.not_persistent = 1;
199
200                         ainfo.state = (1 << MD_SB_CLEAN);
201                         ainfo.layout = 0;
202                         ainfo.chunk_size = md_setup_args[ent].chunk;
203                         err = ksys_ioctl(fd, SET_ARRAY_INFO, (long)&ainfo);
204                         for (i = 0; !err && i <= MD_SB_DISKS; i++) {
205                                 dev = devices[i];
206                                 if (!dev)
207                                         break;
208                                 dinfo.number = i;
209                                 dinfo.raid_disk = i;
210                                 dinfo.state = (1<<MD_DISK_ACTIVE)|(1<<MD_DISK_SYNC);
211                                 dinfo.major = MAJOR(dev);
212                                 dinfo.minor = MINOR(dev);
213                                 err = ksys_ioctl(fd, ADD_NEW_DISK,
214                                                  (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                                 ksys_ioctl(fd, ADD_NEW_DISK, (long)&dinfo);
225                         }
226                 }
227                 if (!err)
228                         err = ksys_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                         ksys_close(fd);
238                         fd = ksys_open(name, 0, 0);
239                         ksys_ioctl(fd, BLKRRPART, 0);
240                 }
241                 ksys_close(fd);
242         }
243 }
244
245 static 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, "autodetect", wlen))
262                         raid_noautodetect = 0;
263                 if (strncmp(str, "partitionable", wlen)==0)
264                         raid_autopart = 1;
265                 if (strncmp(str, "part", wlen)==0)
266                         raid_autopart = 1;
267                 pos += wlen+1;
268         }
269         return 1;
270 }
271
272 __setup("raid=", raid_setup);
273 __setup("md=", md_setup);
274
275 static void __init autodetect_raid(void)
276 {
277         int fd;
278
279         /*
280          * Since we don't want to detect and use half a raid array, we need to
281          * wait for the known devices to complete their probing
282          */
283         printk(KERN_INFO "md: Waiting for all devices to be available before autodetect\n");
284         printk(KERN_INFO "md: If you don't use raid, use raid=noautodetect\n");
285
286         wait_for_device_probe();
287
288         fd = ksys_open("/dev/md0", 0, 0);
289         if (fd >= 0) {
290                 ksys_ioctl(fd, RAID_AUTORUN, raid_autopart);
291                 ksys_close(fd);
292         }
293 }
294
295 void __init md_run_setup(void)
296 {
297         create_dev("/dev/md0", MKDEV(MD_MAJOR, 0));
298
299         if (raid_noautodetect)
300                 printk(KERN_INFO "md: Skipping autodetection of RAID arrays. (raid=autodetect will force)\n");
301         else
302                 autodetect_raid();
303         md_setup_drive();
304 }