[PATCH] md: remove personality numbering from md
[linux-2.6.git] / init / do_mounts_md.c
1
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 static int __initdata raid_noautodetect, raid_autopart;
16
17 static struct {
18         int minor;
19         int partitioned;
20         int level;
21         int chunk;
22         char *device_names;
23 } md_setup_args[MAX_MD_DEVS] __initdata;
24
25 static int md_setup_ents __initdata;
26
27 extern int mdp_major;
28 /*
29  * Parse the command-line parameters given our kernel, but do not
30  * actually try to invoke the MD device now; that is handled by
31  * md_setup_drive after the low-level disk drivers have initialised.
32  *
33  * 27/11/1999: Fixed to work correctly with the 2.3 kernel (which
34  *             assigns the task of parsing integer arguments to the
35  *             invoked program now).  Added ability to initialise all
36  *             the MD devices (by specifying multiple "md=" lines)
37  *             instead of just one.  -- KTK
38  * 18May2000: Added support for persistent-superblock arrays:
39  *             md=n,0,factor,fault,device-list   uses RAID0 for device n
40  *             md=n,-1,factor,fault,device-list  uses LINEAR for device n
41  *             md=n,device-list      reads a RAID superblock from the devices
42  *             elements in device-list are read by name_to_kdev_t so can be
43  *             a hex number or something like /dev/hda1 /dev/sdb
44  * 2001-06-03: Dave Cinege <dcinege@psychosis.com>
45  *              Shifted name_to_kdev_t() and related operations to md_set_drive()
46  *              for later execution. Rewrote section to make devfs compatible.
47  */
48 static int __init md_setup(char *str)
49 {
50         int minor, level, factor, fault, partitioned = 0;
51         char *pername = "";
52         char *str1;
53         int ent;
54
55         if (*str == 'd') {
56                 partitioned = 1;
57                 str++;
58         }
59         if (get_option(&str, &minor) != 2) {    /* MD Number */
60                 printk(KERN_WARNING "md: Too few arguments supplied to md=.\n");
61                 return 0;
62         }
63         str1 = str;
64         if (minor >= MAX_MD_DEVS) {
65                 printk(KERN_WARNING "md: md=%d, Minor device number too high.\n", minor);
66                 return 0;
67         }
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 >= MAX_MD_DEVS) {
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], devfs_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                 sprintf(devfs_name, "/dev/md/%s%d", partitioned?"d":"", minor);
136                 if (partitioned)
137                         dev = MKDEV(mdp_major, minor << MdpMinorShift);
138                 else
139                         dev = MKDEV(MD_MAJOR, minor);
140                 create_dev(name, dev, devfs_name);
141                 for (i = 0; i < MD_SB_DISKS && devname != 0; i++) {
142                         char *p;
143                         char comp_name[64];
144                         u32 rdev;
145
146                         p = strchr(devname, ',');
147                         if (p)
148                                 *p++ = 0;
149
150                         dev = name_to_dev_t(devname);
151                         if (strncmp(devname, "/dev/", 5) == 0)
152                                 devname += 5;
153                         snprintf(comp_name, 63, "/dev/%s", devname);
154                         rdev = bstat(comp_name);
155                         if (rdev)
156                                 dev = new_decode_dev(rdev);
157                         if (!dev) {
158                                 printk(KERN_WARNING "md: Unknown device name: %s\n", devname);
159                                 break;
160                         }
161
162                         devices[i] = dev;
163
164                         devname = p;
165                 }
166                 devices[i] = 0;
167
168                 if (!i)
169                         continue;
170
171                 printk(KERN_INFO "md: Loading md%s%d: %s\n",
172                         partitioned ? "_d" : "", minor,
173                         md_setup_args[ent].device_names);
174
175                 fd = sys_open(name, 0, 0);
176                 if (fd < 0) {
177                         printk(KERN_ERR "md: open failed - cannot start "
178                                         "array %s\n", name);
179                         continue;
180                 }
181                 if (sys_ioctl(fd, SET_ARRAY_INFO, 0) == -EBUSY) {
182                         printk(KERN_WARNING
183                                "md: Ignoring md=%d, already autodetected. (Use raid=noautodetect)\n",
184                                minor);
185                         sys_close(fd);
186                         continue;
187                 }
188
189                 if (md_setup_args[ent].level != LEVEL_NONE) {
190                         /* non-persistent */
191                         mdu_array_info_t ainfo;
192                         ainfo.level = md_setup_args[ent].level;
193                         ainfo.size = 0;
194                         ainfo.nr_disks =0;
195                         ainfo.raid_disks =0;
196                         while (devices[ainfo.raid_disks])
197                                 ainfo.raid_disks++;
198                         ainfo.md_minor =minor;
199                         ainfo.not_persistent = 1;
200
201                         ainfo.state = (1 << MD_SB_CLEAN);
202                         ainfo.layout = 0;
203                         ainfo.chunk_size = md_setup_args[ent].chunk;
204                         err = sys_ioctl(fd, SET_ARRAY_INFO, (long)&ainfo);
205                         for (i = 0; !err && i <= MD_SB_DISKS; i++) {
206                                 dev = devices[i];
207                                 if (!dev)
208                                         break;
209                                 dinfo.number = i;
210                                 dinfo.raid_disk = i;
211                                 dinfo.state = (1<<MD_DISK_ACTIVE)|(1<<MD_DISK_SYNC);
212                                 dinfo.major = MAJOR(dev);
213                                 dinfo.minor = MINOR(dev);
214                                 err = sys_ioctl(fd, ADD_NEW_DISK, (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                                 sys_ioctl(fd, ADD_NEW_DISK, (long)&dinfo);
225                         }
226                 }
227                 if (!err)
228                         err = sys_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                         sys_close(fd);
238                         fd = sys_open(name, 0, 0);
239                         sys_ioctl(fd, BLKRRPART, 0);
240                 }
241                 sys_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, "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 void __init md_run_setup(void)
274 {
275         create_dev("/dev/md0", MKDEV(MD_MAJOR, 0), "md/0");
276         if (raid_noautodetect)
277                 printk(KERN_INFO "md: Skipping autodetection of RAID arrays. (raid=noautodetect)\n");
278         else {
279                 int fd = sys_open("/dev/md0", 0, 0);
280                 if (fd >= 0) {
281                         sys_ioctl(fd, RAID_AUTORUN, raid_autopart);
282                         sys_close(fd);
283                 }
284         }
285         md_setup_drive();
286 }