[PATCH] md: remove MAX_MD_DEVS which is an arbitrary limit
[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[256] __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         for (ent=0 ; ent< md_setup_ents ; ent++)
65                 if (md_setup_args[ent].minor == minor &&
66                     md_setup_args[ent].partitioned == partitioned) {
67                         printk(KERN_WARNING "md: md=%s%d, Specified more than once. "
68                                "Replacing previous definition.\n", partitioned?"d":"", minor);
69                         break;
70                 }
71         if (ent >= ARRAY_SIZE(md_setup_args)) {
72                 printk(KERN_WARNING "md: md=%s%d - too many md initialisations\n", partitioned?"d":"", minor);
73                 return 0;
74         }
75         if (ent >= md_setup_ents)
76                 md_setup_ents++;
77         switch (get_option(&str, &level)) {     /* RAID level */
78         case 2: /* could be 0 or -1.. */
79                 if (level == 0 || level == LEVEL_LINEAR) {
80                         if (get_option(&str, &factor) != 2 ||   /* Chunk Size */
81                                         get_option(&str, &fault) != 2) {
82                                 printk(KERN_WARNING "md: Too few arguments supplied to md=.\n");
83                                 return 0;
84                         }
85                         md_setup_args[ent].level = level;
86                         md_setup_args[ent].chunk = 1 << (factor+12);
87                         if (level ==  LEVEL_LINEAR)
88                                 pername = "linear";
89                         else
90                                 pername = "raid0";
91                         break;
92                 }
93                 /* FALL THROUGH */
94         case 1: /* the first device is numeric */
95                 str = str1;
96                 /* FALL THROUGH */
97         case 0:
98                 md_setup_args[ent].level = LEVEL_NONE;
99                 pername="super-block";
100         }
101
102         printk(KERN_INFO "md: Will configure md%d (%s) from %s, below.\n",
103                 minor, pername, str);
104         md_setup_args[ent].device_names = str;
105         md_setup_args[ent].partitioned = partitioned;
106         md_setup_args[ent].minor = minor;
107
108         return 1;
109 }
110
111 #define MdpMinorShift 6
112
113 static void __init md_setup_drive(void)
114 {
115         int minor, i, ent, partitioned;
116         dev_t dev;
117         dev_t devices[MD_SB_DISKS+1];
118
119         for (ent = 0; ent < md_setup_ents ; ent++) {
120                 int fd;
121                 int err = 0;
122                 char *devname;
123                 mdu_disk_info_t dinfo;
124                 char name[16];
125
126                 minor = md_setup_args[ent].minor;
127                 partitioned = md_setup_args[ent].partitioned;
128                 devname = md_setup_args[ent].device_names;
129
130                 sprintf(name, "/dev/md%s%d", partitioned?"_d":"", minor);
131                 if (partitioned)
132                         dev = MKDEV(mdp_major, minor << MdpMinorShift);
133                 else
134                         dev = MKDEV(MD_MAJOR, minor);
135                 create_dev(name, dev);
136                 for (i = 0; i < MD_SB_DISKS && devname != 0; i++) {
137                         char *p;
138                         char comp_name[64];
139                         u32 rdev;
140
141                         p = strchr(devname, ',');
142                         if (p)
143                                 *p++ = 0;
144
145                         dev = name_to_dev_t(devname);
146                         if (strncmp(devname, "/dev/", 5) == 0)
147                                 devname += 5;
148                         snprintf(comp_name, 63, "/dev/%s", devname);
149                         rdev = bstat(comp_name);
150                         if (rdev)
151                                 dev = new_decode_dev(rdev);
152                         if (!dev) {
153                                 printk(KERN_WARNING "md: Unknown device name: %s\n", devname);
154                                 break;
155                         }
156
157                         devices[i] = dev;
158
159                         devname = p;
160                 }
161                 devices[i] = 0;
162
163                 if (!i)
164                         continue;
165
166                 printk(KERN_INFO "md: Loading md%s%d: %s\n",
167                         partitioned ? "_d" : "", minor,
168                         md_setup_args[ent].device_names);
169
170                 fd = sys_open(name, 0, 0);
171                 if (fd < 0) {
172                         printk(KERN_ERR "md: open failed - cannot start "
173                                         "array %s\n", name);
174                         continue;
175                 }
176                 if (sys_ioctl(fd, SET_ARRAY_INFO, 0) == -EBUSY) {
177                         printk(KERN_WARNING
178                                "md: Ignoring md=%d, already autodetected. (Use raid=noautodetect)\n",
179                                minor);
180                         sys_close(fd);
181                         continue;
182                 }
183
184                 if (md_setup_args[ent].level != LEVEL_NONE) {
185                         /* non-persistent */
186                         mdu_array_info_t ainfo;
187                         ainfo.level = md_setup_args[ent].level;
188                         ainfo.size = 0;
189                         ainfo.nr_disks =0;
190                         ainfo.raid_disks =0;
191                         while (devices[ainfo.raid_disks])
192                                 ainfo.raid_disks++;
193                         ainfo.md_minor =minor;
194                         ainfo.not_persistent = 1;
195
196                         ainfo.state = (1 << MD_SB_CLEAN);
197                         ainfo.layout = 0;
198                         ainfo.chunk_size = md_setup_args[ent].chunk;
199                         err = sys_ioctl(fd, SET_ARRAY_INFO, (long)&ainfo);
200                         for (i = 0; !err && i <= MD_SB_DISKS; i++) {
201                                 dev = devices[i];
202                                 if (!dev)
203                                         break;
204                                 dinfo.number = i;
205                                 dinfo.raid_disk = i;
206                                 dinfo.state = (1<<MD_DISK_ACTIVE)|(1<<MD_DISK_SYNC);
207                                 dinfo.major = MAJOR(dev);
208                                 dinfo.minor = MINOR(dev);
209                                 err = sys_ioctl(fd, ADD_NEW_DISK, (long)&dinfo);
210                         }
211                 } else {
212                         /* persistent */
213                         for (i = 0; i <= MD_SB_DISKS; i++) {
214                                 dev = devices[i];
215                                 if (!dev)
216                                         break;
217                                 dinfo.major = MAJOR(dev);
218                                 dinfo.minor = MINOR(dev);
219                                 sys_ioctl(fd, ADD_NEW_DISK, (long)&dinfo);
220                         }
221                 }
222                 if (!err)
223                         err = sys_ioctl(fd, RUN_ARRAY, 0);
224                 if (err)
225                         printk(KERN_WARNING "md: starting md%d failed\n", minor);
226                 else {
227                         /* reread the partition table.
228                          * I (neilb) and not sure why this is needed, but I cannot
229                          * boot a kernel with devfs compiled in from partitioned md
230                          * array without it
231                          */
232                         sys_close(fd);
233                         fd = sys_open(name, 0, 0);
234                         sys_ioctl(fd, BLKRRPART, 0);
235                 }
236                 sys_close(fd);
237         }
238 }
239
240 static int __init raid_setup(char *str)
241 {
242         int len, pos;
243
244         len = strlen(str) + 1;
245         pos = 0;
246
247         while (pos < len) {
248                 char *comma = strchr(str+pos, ',');
249                 int wlen;
250                 if (comma)
251                         wlen = (comma-str)-pos;
252                 else    wlen = (len-1)-pos;
253
254                 if (!strncmp(str, "noautodetect", wlen))
255                         raid_noautodetect = 1;
256                 if (strncmp(str, "partitionable", wlen)==0)
257                         raid_autopart = 1;
258                 if (strncmp(str, "part", wlen)==0)
259                         raid_autopart = 1;
260                 pos += wlen+1;
261         }
262         return 1;
263 }
264
265 __setup("raid=", raid_setup);
266 __setup("md=", md_setup);
267
268 void __init md_run_setup(void)
269 {
270         create_dev("/dev/md0", MKDEV(MD_MAJOR, 0));
271         if (raid_noautodetect)
272                 printk(KERN_INFO "md: Skipping autodetection of RAID arrays. (raid=noautodetect)\n");
273         else {
274                 int fd = sys_open("/dev/md0", 0, 0);
275                 if (fd >= 0) {
276                         sys_ioctl(fd, RAID_AUTORUN, raid_autopart);
277                         sys_close(fd);
278                 }
279         }
280         md_setup_drive();
281 }