Merge tag 'ext4_for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tytso...
[platform/kernel/linux-3.10.git] / 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 }