Consolidate driver_probe_done() loops into one place
[linux-3.10.git] / init / do_mounts_md.c
1 #include <linux/delay.h>
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 #ifdef CONFIG_MD_AUTODETECT
16 static int __initdata raid_noautodetect;
17 #else
18 static int __initdata raid_noautodetect=1;
19 #endif
20 static int __initdata raid_autopart;
21
22 static struct {
23         int minor;
24         int partitioned;
25         int level;
26         int chunk;
27         char *device_names;
28 } md_setup_args[256] __initdata;
29
30 static int md_setup_ents __initdata;
31
32 /*
33  * Parse the command-line parameters given our kernel, but do not
34  * actually try to invoke the MD device now; that is handled by
35  * md_setup_drive after the low-level disk drivers have initialised.
36  *
37  * 27/11/1999: Fixed to work correctly with the 2.3 kernel (which
38  *             assigns the task of parsing integer arguments to the
39  *             invoked program now).  Added ability to initialise all
40  *             the MD devices (by specifying multiple "md=" lines)
41  *             instead of just one.  -- KTK
42  * 18May2000: Added support for persistent-superblock arrays:
43  *             md=n,0,factor,fault,device-list   uses RAID0 for device n
44  *             md=n,-1,factor,fault,device-list  uses LINEAR for device n
45  *             md=n,device-list      reads a RAID superblock from the devices
46  *             elements in device-list are read by name_to_kdev_t so can be
47  *             a hex number or something like /dev/hda1 /dev/sdb
48  * 2001-06-03: Dave Cinege <dcinege@psychosis.com>
49  *              Shifted name_to_kdev_t() and related operations to md_set_drive()
50  *              for later execution. Rewrote section to make devfs compatible.
51  */
52 static int __init md_setup(char *str)
53 {
54         int minor, level, factor, fault, partitioned = 0;
55         char *pername = "";
56         char *str1;
57         int ent;
58
59         if (*str == 'd') {
60                 partitioned = 1;
61                 str++;
62         }
63         if (get_option(&str, &minor) != 2) {    /* MD Number */
64                 printk(KERN_WARNING "md: Too few arguments supplied to md=.\n");
65                 return 0;
66         }
67         str1 = str;
68         for (ent=0 ; ent< md_setup_ents ; ent++)
69                 if (md_setup_args[ent].minor == minor &&
70                     md_setup_args[ent].partitioned == partitioned) {
71                         printk(KERN_WARNING "md: md=%s%d, Specified more than once. "
72                                "Replacing previous definition.\n", partitioned?"d":"", minor);
73                         break;
74                 }
75         if (ent >= ARRAY_SIZE(md_setup_args)) {
76                 printk(KERN_WARNING "md: md=%s%d - too many md initialisations\n", partitioned?"d":"", minor);
77                 return 0;
78         }
79         if (ent >= md_setup_ents)
80                 md_setup_ents++;
81         switch (get_option(&str, &level)) {     /* RAID level */
82         case 2: /* could be 0 or -1.. */
83                 if (level == 0 || level == LEVEL_LINEAR) {
84                         if (get_option(&str, &factor) != 2 ||   /* Chunk Size */
85                                         get_option(&str, &fault) != 2) {
86                                 printk(KERN_WARNING "md: Too few arguments supplied to md=.\n");
87                                 return 0;
88                         }
89                         md_setup_args[ent].level = level;
90                         md_setup_args[ent].chunk = 1 << (factor+12);
91                         if (level ==  LEVEL_LINEAR)
92                                 pername = "linear";
93                         else
94                                 pername = "raid0";
95                         break;
96                 }
97                 /* FALL THROUGH */
98         case 1: /* the first device is numeric */
99                 str = str1;
100                 /* FALL THROUGH */
101         case 0:
102                 md_setup_args[ent].level = LEVEL_NONE;
103                 pername="super-block";
104         }
105
106         printk(KERN_INFO "md: Will configure md%d (%s) from %s, below.\n",
107                 minor, pername, str);
108         md_setup_args[ent].device_names = str;
109         md_setup_args[ent].partitioned = partitioned;
110         md_setup_args[ent].minor = minor;
111
112         return 1;
113 }
114
115 #define MdpMinorShift 6
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 = sys_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 (sys_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                         sys_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 = sys_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 = sys_ioctl(fd, ADD_NEW_DISK, (long)&dinfo);
214                         }
215                 } else {
216                         /* persistent */
217                         for (i = 0; i <= MD_SB_DISKS; i++) {
218                                 dev = devices[i];
219                                 if (!dev)
220                                         break;
221                                 dinfo.major = MAJOR(dev);
222                                 dinfo.minor = MINOR(dev);
223                                 sys_ioctl(fd, ADD_NEW_DISK, (long)&dinfo);
224                         }
225                 }
226                 if (!err)
227                         err = sys_ioctl(fd, RUN_ARRAY, 0);
228                 if (err)
229                         printk(KERN_WARNING "md: starting md%d failed\n", minor);
230                 else {
231                         /* reread the partition table.
232                          * I (neilb) and not sure why this is needed, but I cannot
233                          * boot a kernel with devfs compiled in from partitioned md
234                          * array without it
235                          */
236                         sys_close(fd);
237                         fd = sys_open(name, 0, 0);
238                         sys_ioctl(fd, BLKRRPART, 0);
239                 }
240                 sys_close(fd);
241         }
242 }
243
244 static int __init raid_setup(char *str)
245 {
246         int len, pos;
247
248         len = strlen(str) + 1;
249         pos = 0;
250
251         while (pos < len) {
252                 char *comma = strchr(str+pos, ',');
253                 int wlen;
254                 if (comma)
255                         wlen = (comma-str)-pos;
256                 else    wlen = (len-1)-pos;
257
258                 if (!strncmp(str, "noautodetect", wlen))
259                         raid_noautodetect = 1;
260                 if (!strncmp(str, "autodetect", wlen))
261                         raid_noautodetect = 0;
262                 if (strncmp(str, "partitionable", wlen)==0)
263                         raid_autopart = 1;
264                 if (strncmp(str, "part", wlen)==0)
265                         raid_autopart = 1;
266                 pos += wlen+1;
267         }
268         return 1;
269 }
270
271 __setup("raid=", raid_setup);
272 __setup("md=", md_setup);
273
274 static void __init autodetect_raid(void)
275 {
276         int fd;
277
278         /*
279          * Since we don't want to detect and use half a raid array, we need to
280          * wait for the known devices to complete their probing
281          */
282         printk(KERN_INFO "md: Waiting for all devices to be available before autodetect\n");
283         printk(KERN_INFO "md: If you don't use raid, use raid=noautodetect\n");
284
285         wait_for_device_probe();
286
287         fd = sys_open("/dev/md0", 0, 0);
288         if (fd >= 0) {
289                 sys_ioctl(fd, RAID_AUTORUN, raid_autopart);
290                 sys_close(fd);
291         }
292 }
293
294 void __init md_run_setup(void)
295 {
296         create_dev("/dev/md0", MKDEV(MD_MAJOR, 0));
297
298         if (raid_noautodetect)
299                 printk(KERN_INFO "md: Skipping autodetection of RAID arrays. (raid=autodetect will force)\n");
300         else
301                 autodetect_raid();
302         md_setup_drive();
303 }