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Linux/init/do_mounts_md.c

  1 /*
  2  * Many of the syscalls used in this file expect some of the arguments
  3  * to be __user pointers not __kernel pointers.  To limit the sparse
  4  * noise, turn off sparse checking for this file.
  5  */
  6 #ifdef __CHECKER__
  7 #undef __CHECKER__
  8 #warning "Sparse checking disabled for this file"
  9 #endif
 10 
 11 #include <linux/delay.h>
 12 #include <linux/raid/md_u.h>
 13 #include <linux/raid/md_p.h>
 14 
 15 #include "do_mounts.h"
 16 
 17 /*
 18  * When md (and any require personalities) are compiled into the kernel
 19  * (not a module), arrays can be assembles are boot time using with AUTODETECT
 20  * where specially marked partitions are registered with md_autodetect_dev(),
 21  * and with MD_BOOT where devices to be collected are given on the boot line
 22  * with md=.....
 23  * The code for that is here.
 24  */
 25 
 26 #ifdef CONFIG_MD_AUTODETECT
 27 static int __initdata raid_noautodetect;
 28 #else
 29 static int __initdata raid_noautodetect=1;
 30 #endif
 31 static int __initdata raid_autopart;
 32 
 33 static struct {
 34         int minor;
 35         int partitioned;
 36         int level;
 37         int chunk;
 38         char *device_names;
 39 } md_setup_args[256] __initdata;
 40 
 41 static int md_setup_ents __initdata;
 42 
 43 /*
 44  * Parse the command-line parameters given our kernel, but do not
 45  * actually try to invoke the MD device now; that is handled by
 46  * md_setup_drive after the low-level disk drivers have initialised.
 47  *
 48  * 27/11/1999: Fixed to work correctly with the 2.3 kernel (which
 49  *             assigns the task of parsing integer arguments to the
 50  *             invoked program now).  Added ability to initialise all
 51  *             the MD devices (by specifying multiple "md=" lines)
 52  *             instead of just one.  -- KTK
 53  * 18May2000: Added support for persistent-superblock arrays:
 54  *             md=n,0,factor,fault,device-list   uses RAID0 for device n
 55  *             md=n,-1,factor,fault,device-list  uses LINEAR for device n
 56  *             md=n,device-list      reads a RAID superblock from the devices
 57  *             elements in device-list are read by name_to_kdev_t so can be
 58  *             a hex number or something like /dev/hda1 /dev/sdb
 59  * 2001-06-03: Dave Cinege <dcinege@psychosis.com>
 60  *              Shifted name_to_kdev_t() and related operations to md_set_drive()
 61  *              for later execution. Rewrote section to make devfs compatible.
 62  */
 63 static int __init md_setup(char *str)
 64 {
 65         int minor, level, factor, fault, partitioned = 0;
 66         char *pername = "";
 67         char *str1;
 68         int ent;
 69 
 70         if (*str == 'd') {
 71                 partitioned = 1;
 72                 str++;
 73         }
 74         if (get_option(&str, &minor) != 2) {    /* MD Number */
 75                 printk(KERN_WARNING "md: Too few arguments supplied to md=.\n");
 76                 return 0;
 77         }
 78         str1 = str;
 79         for (ent=0 ; ent< md_setup_ents ; ent++)
 80                 if (md_setup_args[ent].minor == minor &&
 81                     md_setup_args[ent].partitioned == partitioned) {
 82                         printk(KERN_WARNING "md: md=%s%d, Specified more than once. "
 83                                "Replacing previous definition.\n", partitioned?"d":"", minor);
 84                         break;
 85                 }
 86         if (ent >= ARRAY_SIZE(md_setup_args)) {
 87                 printk(KERN_WARNING "md: md=%s%d - too many md initialisations\n", partitioned?"d":"", minor);
 88                 return 0;
 89         }
 90         if (ent >= md_setup_ents)
 91                 md_setup_ents++;
 92         switch (get_option(&str, &level)) {     /* RAID level */
 93         case 2: /* could be 0 or -1.. */
 94                 if (level == 0 || level == LEVEL_LINEAR) {
 95                         if (get_option(&str, &factor) != 2 ||   /* Chunk Size */
 96                                         get_option(&str, &fault) != 2) {
 97                                 printk(KERN_WARNING "md: Too few arguments supplied to md=.\n");
 98                                 return 0;
 99                         }
100                         md_setup_args[ent].level = level;
101                         md_setup_args[ent].chunk = 1 << (factor+12);
102                         if (level ==  LEVEL_LINEAR)
103                                 pername = "linear";
104                         else
105                                 pername = "raid0";
106                         break;
107                 }
108                 /* FALL THROUGH */
109         case 1: /* the first device is numeric */
110                 str = str1;
111                 /* FALL THROUGH */
112         case 0:
113                 md_setup_args[ent].level = LEVEL_NONE;
114                 pername="super-block";
115         }
116 
117         printk(KERN_INFO "md: Will configure md%d (%s) from %s, below.\n",
118                 minor, pername, str);
119         md_setup_args[ent].device_names = str;
120         md_setup_args[ent].partitioned = partitioned;
121         md_setup_args[ent].minor = minor;
122 
123         return 1;
124 }
125 
126 static void __init md_setup_drive(void)
127 {
128         int minor, i, ent, partitioned;
129         dev_t dev;
130         dev_t devices[MD_SB_DISKS+1];
131 
132         for (ent = 0; ent < md_setup_ents ; ent++) {
133                 int fd;
134                 int err = 0;
135                 char *devname;
136                 mdu_disk_info_t dinfo;
137                 char name[16];
138 
139                 minor = md_setup_args[ent].minor;
140                 partitioned = md_setup_args[ent].partitioned;
141                 devname = md_setup_args[ent].device_names;
142 
143                 sprintf(name, "/dev/md%s%d", partitioned?"_d":"", minor);
144                 if (partitioned)
145                         dev = MKDEV(mdp_major, minor << MdpMinorShift);
146                 else
147                         dev = MKDEV(MD_MAJOR, minor);
148                 create_dev(name, dev);
149                 for (i = 0; i < MD_SB_DISKS && devname != NULL; i++) {
150                         char *p;
151                         char comp_name[64];
152                         u32 rdev;
153 
154                         p = strchr(devname, ',');
155                         if (p)
156                                 *p++ = 0;
157 
158                         dev = name_to_dev_t(devname);
159                         if (strncmp(devname, "/dev/", 5) == 0)
160                                 devname += 5;
161                         snprintf(comp_name, 63, "/dev/%s", devname);
162                         rdev = bstat(comp_name);
163                         if (rdev)
164                                 dev = new_decode_dev(rdev);
165                         if (!dev) {
166                                 printk(KERN_WARNING "md: Unknown device name: %s\n", devname);
167                                 break;
168                         }
169 
170                         devices[i] = dev;
171 
172                         devname = p;
173                 }
174                 devices[i] = 0;
175 
176                 if (!i)
177                         continue;
178 
179                 printk(KERN_INFO "md: Loading md%s%d: %s\n",
180                         partitioned ? "_d" : "", minor,
181                         md_setup_args[ent].device_names);
182 
183                 fd = sys_open(name, 0, 0);
184                 if (fd < 0) {
185                         printk(KERN_ERR "md: open failed - cannot start "
186                                         "array %s\n", name);
187                         continue;
188                 }
189                 if (sys_ioctl(fd, SET_ARRAY_INFO, 0) == -EBUSY) {
190                         printk(KERN_WARNING
191                                "md: Ignoring md=%d, already autodetected. (Use raid=noautodetect)\n",
192                                minor);
193                         sys_close(fd);
194                         continue;
195                 }
196 
197                 if (md_setup_args[ent].level != LEVEL_NONE) {
198                         /* non-persistent */
199                         mdu_array_info_t ainfo;
200                         ainfo.level = md_setup_args[ent].level;
201                         ainfo.size = 0;
202                         ainfo.nr_disks =0;
203                         ainfo.raid_disks =0;
204                         while (devices[ainfo.raid_disks])
205                                 ainfo.raid_disks++;
206                         ainfo.md_minor =minor;
207                         ainfo.not_persistent = 1;
208 
209                         ainfo.state = (1 << MD_SB_CLEAN);
210                         ainfo.layout = 0;
211                         ainfo.chunk_size = md_setup_args[ent].chunk;
212                         err = sys_ioctl(fd, SET_ARRAY_INFO, (long)&ainfo);
213                         for (i = 0; !err && i <= MD_SB_DISKS; i++) {
214                                 dev = devices[i];
215                                 if (!dev)
216                                         break;
217                                 dinfo.number = i;
218                                 dinfo.raid_disk = i;
219                                 dinfo.state = (1<<MD_DISK_ACTIVE)|(1<<MD_DISK_SYNC);
220                                 dinfo.major = MAJOR(dev);
221                                 dinfo.minor = MINOR(dev);
222                                 err = sys_ioctl(fd, ADD_NEW_DISK, (long)&dinfo);
223                         }
224                 } else {
225                         /* persistent */
226                         for (i = 0; i <= MD_SB_DISKS; i++) {
227                                 dev = devices[i];
228                                 if (!dev)
229                                         break;
230                                 dinfo.major = MAJOR(dev);
231                                 dinfo.minor = MINOR(dev);
232                                 sys_ioctl(fd, ADD_NEW_DISK, (long)&dinfo);
233                         }
234                 }
235                 if (!err)
236                         err = sys_ioctl(fd, RUN_ARRAY, 0);
237                 if (err)
238                         printk(KERN_WARNING "md: starting md%d failed\n", minor);
239                 else {
240                         /* reread the partition table.
241                          * I (neilb) and not sure why this is needed, but I cannot
242                          * boot a kernel with devfs compiled in from partitioned md
243                          * array without it
244                          */
245                         sys_close(fd);
246                         fd = sys_open(name, 0, 0);
247                         sys_ioctl(fd, BLKRRPART, 0);
248                 }
249                 sys_close(fd);
250         }
251 }
252 
253 static int __init raid_setup(char *str)
254 {
255         int len, pos;
256 
257         len = strlen(str) + 1;
258         pos = 0;
259 
260         while (pos < len) {
261                 char *comma = strchr(str+pos, ',');
262                 int wlen;
263                 if (comma)
264                         wlen = (comma-str)-pos;
265                 else    wlen = (len-1)-pos;
266 
267                 if (!strncmp(str, "noautodetect", wlen))
268                         raid_noautodetect = 1;
269                 if (!strncmp(str, "autodetect", wlen))
270                         raid_noautodetect = 0;
271                 if (strncmp(str, "partitionable", wlen)==0)
272                         raid_autopart = 1;
273                 if (strncmp(str, "part", wlen)==0)
274                         raid_autopart = 1;
275                 pos += wlen+1;
276         }
277         return 1;
278 }
279 
280 __setup("raid=", raid_setup);
281 __setup("md=", md_setup);
282 
283 static void __init autodetect_raid(void)
284 {
285         int fd;
286 
287         /*
288          * Since we don't want to detect and use half a raid array, we need to
289          * wait for the known devices to complete their probing
290          */
291         printk(KERN_INFO "md: Waiting for all devices to be available before autodetect\n");
292         printk(KERN_INFO "md: If you don't use raid, use raid=noautodetect\n");
293 
294         wait_for_device_probe();
295 
296         fd = sys_open("/dev/md0", 0, 0);
297         if (fd >= 0) {
298                 sys_ioctl(fd, RAID_AUTORUN, raid_autopart);
299                 sys_close(fd);
300         }
301 }
302 
303 void __init md_run_setup(void)
304 {
305         create_dev("/dev/md0", MKDEV(MD_MAJOR, 0));
306 
307         if (raid_noautodetect)
308                 printk(KERN_INFO "md: Skipping autodetection of RAID arrays. (raid=autodetect will force)\n");
309         else
310                 autodetect_raid();
311         md_setup_drive();
312 }
313 

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