init/do_mounts_md.c: msleep compile fix
[linux-2.6.git] / init / do_mounts_md.c
1 #include <linux/delay.h>
2 #include <linux/raid/md.h>
3 #include <linux/delay.h>
4
5 #include "do_mounts.h"
6
7 /*
8  * When md (and any require personalities) are compiled into the kernel
9  * (not a module), arrays can be assembles are boot time using with AUTODETECT
10  * where specially marked partitions are registered with md_autodetect_dev(),
11  * and with MD_BOOT where devices to be collected are given on the boot line
12  * with md=.....
13  * The code for that is here.
14  */
15
16 #ifdef CONFIG_MD_AUTODETECT
17 static int __initdata raid_noautodetect;
18 #else
19 static int __initdata raid_noautodetect=1;
20 #endif
21 static int __initdata raid_autopart;
22
23 static struct {
24         int minor;
25         int partitioned;
26         int level;
27         int chunk;
28         char *device_names;
29 } md_setup_args[256] __initdata;
30
31 static int md_setup_ents __initdata;
32
33 /*
34  * Parse the command-line parameters given our kernel, but do not
35  * actually try to invoke the MD device now; that is handled by
36  * md_setup_drive after the low-level disk drivers have initialised.
37  *
38  * 27/11/1999: Fixed to work correctly with the 2.3 kernel (which
39  *             assigns the task of parsing integer arguments to the
40  *             invoked program now).  Added ability to initialise all
41  *             the MD devices (by specifying multiple "md=" lines)
42  *             instead of just one.  -- KTK
43  * 18May2000: Added support for persistent-superblock arrays:
44  *             md=n,0,factor,fault,device-list   uses RAID0 for device n
45  *             md=n,-1,factor,fault,device-list  uses LINEAR for device n
46  *             md=n,device-list      reads a RAID superblock from the devices
47  *             elements in device-list are read by name_to_kdev_t so can be
48  *             a hex number or something like /dev/hda1 /dev/sdb
49  * 2001-06-03: Dave Cinege <dcinege@psychosis.com>
50  *              Shifted name_to_kdev_t() and related operations to md_set_drive()
51  *              for later execution. Rewrote section to make devfs compatible.
52  */
53 static int __init md_setup(char *str)
54 {
55         int minor, level, factor, fault, partitioned = 0;
56         char *pername = "";
57         char *str1;
58         int ent;
59
60         if (*str == 'd') {
61                 partitioned = 1;
62                 str++;
63         }
64         if (get_option(&str, &minor) != 2) {    /* MD Number */
65                 printk(KERN_WARNING "md: Too few arguments supplied to md=.\n");
66                 return 0;
67         }
68         str1 = str;
69         for (ent=0 ; ent< md_setup_ents ; ent++)
70                 if (md_setup_args[ent].minor == minor &&
71                     md_setup_args[ent].partitioned == partitioned) {
72                         printk(KERN_WARNING "md: md=%s%d, Specified more than once. "
73                                "Replacing previous definition.\n", partitioned?"d":"", minor);
74                         break;
75                 }
76         if (ent >= ARRAY_SIZE(md_setup_args)) {
77                 printk(KERN_WARNING "md: md=%s%d - too many md initialisations\n", partitioned?"d":"", minor);
78                 return 0;
79         }
80         if (ent >= md_setup_ents)
81                 md_setup_ents++;
82         switch (get_option(&str, &level)) {     /* RAID level */
83         case 2: /* could be 0 or -1.. */
84                 if (level == 0 || level == LEVEL_LINEAR) {
85                         if (get_option(&str, &factor) != 2 ||   /* Chunk Size */
86                                         get_option(&str, &fault) != 2) {
87                                 printk(KERN_WARNING "md: Too few arguments supplied to md=.\n");
88                                 return 0;
89                         }
90                         md_setup_args[ent].level = level;
91                         md_setup_args[ent].chunk = 1 << (factor+12);
92                         if (level ==  LEVEL_LINEAR)
93                                 pername = "linear";
94                         else
95                                 pername = "raid0";
96                         break;
97                 }
98                 /* FALL THROUGH */
99         case 1: /* the first device is numeric */
100                 str = str1;
101                 /* FALL THROUGH */
102         case 0:
103                 md_setup_args[ent].level = LEVEL_NONE;
104                 pername="super-block";
105         }
106
107         printk(KERN_INFO "md: Will configure md%d (%s) from %s, below.\n",
108                 minor, pername, str);
109         md_setup_args[ent].device_names = str;
110         md_setup_args[ent].partitioned = partitioned;
111         md_setup_args[ent].minor = minor;
112
113         return 1;
114 }
115
116 #define MdpMinorShift 6
117
118 static void __init md_setup_drive(void)
119 {
120         int minor, i, ent, partitioned;
121         dev_t dev;
122         dev_t devices[MD_SB_DISKS+1];
123
124         for (ent = 0; ent < md_setup_ents ; ent++) {
125                 int fd;
126                 int err = 0;
127                 char *devname;
128                 mdu_disk_info_t dinfo;
129                 char name[16];
130
131                 minor = md_setup_args[ent].minor;
132                 partitioned = md_setup_args[ent].partitioned;
133                 devname = md_setup_args[ent].device_names;
134
135                 sprintf(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);
141                 for (i = 0; i < MD_SB_DISKS && devname != NULL; 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, "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 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         while (driver_probe_done() < 0)
286                 msleep(100);
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 }