]> git.ipfire.org Git - thirdparty/mdadm.git/blame - Build.c
DDF: compare_super_ddf: merge local info of other superblock
[thirdparty/mdadm.git] / Build.c
CommitLineData
64c4757e 1/*
9a9dab36 2 * mdadm - manage Linux "md" devices aka RAID arrays.
64c4757e 3 *
e736b623 4 * Copyright (C) 2001-2009 Neil Brown <neilb@suse.de>
64c4757e
NB
5 *
6 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License as published by
9 * the Free Software Foundation; either version 2 of the License, or
10 * (at your option) any later version.
11 *
12 * This program is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 * GNU General Public License for more details.
16 *
17 * You should have received a copy of the GNU General Public License
18 * along with this program; if not, write to the Free Software
19 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
20 *
21 * Author: Neil Brown
e736b623 22 * Email: <neilb@suse.de>
64c4757e
NB
23 */
24
9a9dab36 25#include "mdadm.h"
64c4757e 26
82b27616
NB
27#define REGISTER_DEV _IO (MD_MAJOR, 1)
28#define START_MD _IO (MD_MAJOR, 2)
29#define STOP_MD _IO (MD_MAJOR, 3)
30
a4e8316a
N
31int Build(char *mddev, struct mddev_dev *devlist,
32 struct shape *s, struct context *c)
64c4757e 33{
82b27616
NB
34 /* Build a linear or raid0 arrays without superblocks
35 * We cannot really do any checks, we just do it.
36 * For md_version < 0.90.0, we call REGISTER_DEV
37 * with the device numbers, and then
38 * START_MD giving the "geometry"
39 * geometry is 0xpp00cc
40 * where pp is personality: 1==linear, 2=raid0
41 * cc = chunk size factor: 0==4k, 1==8k etc.
42 *
43 * For md_version >= 0.90.0 we call
44 * SET_ARRAY_INFO, ADD_NEW_DISK, RUN_ARRAY
45 *
46 */
47 int i;
48 int vers;
49 struct stat stb;
98ce3849 50 int subdevs = 0, missing_disks = 0;
a655e550 51 struct mddev_dev *dv;
c82f047c 52 int bitmap_fd;
f9c25f1d 53 unsigned long long bitmapsize;
7f91af49 54 int mdfd;
a04d5763
N
55 char chosen_name[1024];
56 int uuid[4] = {0,0,0,0};
ad5bc697 57 struct map_ent *map = NULL;
82b27616
NB
58
59 /* scan all devices, make sure they really are block devices */
cd29a5c8 60 for (dv = devlist; dv; dv=dv->next) {
98ce3849
NB
61 subdevs++;
62 if (strcmp("missing", dv->devname) == 0) {
63 missing_disks++;
64 continue;
65 }
cd29a5c8 66 if (stat(dv->devname, &stb)) {
e7b84f9d 67 pr_err("Cannot find %s: %s\n",
cd29a5c8 68 dv->devname, strerror(errno));
82b27616
NB
69 return 1;
70 }
71 if ((stb.st_mode & S_IFMT) != S_IFBLK) {
e7b84f9d 72 pr_err("%s is not a block device.\n",
cd29a5c8 73 dv->devname);
82b27616
NB
74 return 1;
75 }
cd29a5c8
NB
76 }
77
a4e8316a 78 if (s->raiddisks != subdevs) {
e7b84f9d 79 pr_err("requested %d devices in array but listed %d\n",
a4e8316a 80 s->raiddisks, subdevs);
cd29a5c8 81 return 1;
82b27616
NB
82 }
83
a4e8316a
N
84 if (s->layout == UnSet)
85 switch(s->level) {
b5e64645 86 default: /* no layout */
a4e8316a 87 s->layout = 0;
b5e64645
NB
88 break;
89 case 10:
a4e8316a 90 s->layout = 0x102; /* near=2, far=1 */
0c9e4afb 91 if (c->verbose > 0)
e7b84f9d 92 pr_err("layout defaults to n1\n");
b5e64645
NB
93 break;
94 case 5:
95 case 6:
a4e8316a 96 s->layout = map_name(r5layout, "default");
0c9e4afb 97 if (c->verbose > 0)
a4e8316a 98 pr_err("layout defaults to %s\n", map_num(r5layout, s->layout));
b5e64645
NB
99 break;
100 case LEVEL_FAULTY:
a4e8316a 101 s->layout = map_name(faultylayout, "default");
b5e64645 102
0c9e4afb 103 if (c->verbose > 0)
a4e8316a 104 pr_err("layout defaults to %s\n", map_num(faultylayout, s->layout));
b5e64645
NB
105 break;
106 }
107
69207ff6 108 /* We need to create the device. It can have no name. */
ad5bc697 109 map_lock(&map);
0c9e4afb 110 mdfd = create_mddev(mddev, NULL, c->autof, LOCAL,
a04d5763 111 chosen_name);
ad5bc697
N
112 if (mdfd < 0) {
113 map_unlock(&map);
7f91af49 114 return 1;
ad5bc697 115 }
a714580e 116 mddev = chosen_name;
b5e64645 117
4dd2df09 118 map_update(&map, fd2devnm(mdfd), "none", uuid, chosen_name);
ad5bc697 119 map_unlock(&map);
a04d5763 120
82b27616 121 vers = md_get_version(mdfd);
aba69144 122
82b27616 123 /* looks Ok, go for it */
cd29a5c8 124 if (vers >= 9000) {
82b27616 125 mdu_array_info_t array;
a4e8316a 126 array.level = s->level;
0a8b92a6
N
127 if (s->size == MAX_SIZE)
128 s->size = 0;
129 array.size = s->size;
a4e8316a
N
130 array.nr_disks = s->raiddisks;
131 array.raid_disks = s->raiddisks;
82b27616
NB
132 array.md_minor = 0;
133 if (fstat(mdfd, &stb)==0)
0df46c2a 134 array.md_minor = minor(stb.st_rdev);
cd29a5c8 135 array.not_persistent = 1;
82b27616 136 array.state = 0; /* not clean, but no errors */
a4e8316a 137 if (s->assume_clean)
dd0781e5 138 array.state |= 1;
a4e8316a
N
139 array.active_disks = s->raiddisks - missing_disks;
140 array.working_disks = s->raiddisks - missing_disks;
82b27616 141 array.spare_disks = 0;
98ce3849 142 array.failed_disks = missing_disks;
a4e8316a
N
143 if (s->chunk == 0 && (s->level==0 || s->level==LEVEL_LINEAR))
144 s->chunk = 64;
145 array.chunk_size = s->chunk*1024;
146 array.layout = s->layout;
82b27616 147 if (ioctl(mdfd, SET_ARRAY_INFO, &array)) {
e7b84f9d 148 pr_err("SET_ARRAY_INFO failed for %s: %s\n",
82b27616 149 mddev, strerror(errno));
7f91af49 150 goto abort;
82b27616 151 }
a4e8316a 152 } else if (s->bitmap_file) {
e7b84f9d 153 pr_err("bitmaps not supported with this kernel\n");
7f91af49 154 goto abort;
82b27616 155 }
5b28bd56 156
a4e8316a 157 if (s->bitmap_file && s->level <= 0) {
e7b84f9d 158 pr_err("bitmaps not meaningful with level %s\n",
a4e8316a 159 map_num(pers, s->level)?:"given");
7f91af49 160 goto abort;
5b28bd56 161 }
82b27616 162 /* now add the devices */
cd29a5c8 163 for ((i=0), (dv = devlist) ; dv ; i++, dv=dv->next) {
beae1dfe 164 unsigned long long dsize;
fe80f49b 165 int fd;
98ce3849
NB
166 if (strcmp("missing", dv->devname) == 0)
167 continue;
cd29a5c8 168 if (stat(dv->devname, &stb)) {
e7b84f9d 169 pr_err("Weird: %s has disappeared.\n",
cd29a5c8 170 dv->devname);
82b27616
NB
171 goto abort;
172 }
cd29a5c8 173 if ((stb.st_mode & S_IFMT)!= S_IFBLK) {
dae45415 174 pr_err("Weird: %s is no longer a block device.\n",
cd29a5c8 175 dv->devname);
82b27616
NB
176 goto abort;
177 }
fe80f49b
NB
178 fd = open(dv->devname, O_RDONLY|O_EXCL);
179 if (fd < 0) {
e7b84f9d 180 pr_err("Cannot open %s: %s\n",
fe80f49b
NB
181 dv->devname, strerror(errno));
182 goto abort;
183 }
beae1dfe 184 if (get_dev_size(fd, NULL, &dsize) &&
a4e8316a
N
185 (s->size == 0 || s->size == MAX_SIZE || dsize < s->size))
186 s->size = dsize;
fe80f49b 187 close(fd);
25affb56 188 if (vers >= 9000) {
82b27616
NB
189 mdu_disk_info_t disk;
190 disk.number = i;
191 disk.raid_disk = i;
dfd4d8ee 192 disk.state = (1<<MD_DISK_SYNC) | (1<<MD_DISK_ACTIVE);
b3d31955 193 if (dv->writemostly == 1)
dfd4d8ee 194 disk.state |= 1<<MD_DISK_WRITEMOSTLY;
0df46c2a
NB
195 disk.major = major(stb.st_rdev);
196 disk.minor = minor(stb.st_rdev);
82b27616 197 if (ioctl(mdfd, ADD_NEW_DISK, &disk)) {
e7b84f9d 198 pr_err("ADD_NEW_DISK failed for %s: %s\n",
cd29a5c8 199 dv->devname, strerror(errno));
82b27616
NB
200 goto abort;
201 }
202 } else {
203 if (ioctl(mdfd, REGISTER_DEV, &stb.st_rdev)) {
e7b84f9d 204 pr_err("REGISTER_DEV failed for %s: %s.\n",
cd29a5c8 205 dv->devname, strerror(errno));
82b27616
NB
206 goto abort;
207 }
208 }
209 }
210 /* now to start it */
cd29a5c8 211 if (vers >= 9000) {
82b27616 212 mdu_param_t param; /* not used by syscall */
a4e8316a
N
213 if (s->bitmap_file) {
214 bitmap_fd = open(s->bitmap_file, O_RDWR);
c82f047c 215 if (bitmap_fd < 0) {
dcec9ee5 216 int major = BITMAP_MAJOR_HI;
1bfdbe01 217#if 0
a4e8316a 218 if (s->bitmap_chunk == UnSet) {
e7b84f9d 219 pr_err("%s cannot be openned.",
a4e8316a 220 s->bitmap_file);
7f91af49 221 goto abort;
c82f047c 222 }
1bfdbe01 223#endif
dcec9ee5
NB
224 if (vers < 9003) {
225 major = BITMAP_MAJOR_HOSTENDIAN;
226#ifdef __BIG_ENDIAN
e7b84f9d 227 pr_err("Warning - bitmaps created on this kernel are not portable\n"
1bfdbe01 228 " between different architectures. Consider upgrading the Linux kernel.\n");
dcec9ee5
NB
229#endif
230 }
a4e8316a
N
231 bitmapsize = s->size>>9; /* FIXME wrong for RAID10 */
232 if (CreateBitmap(s->bitmap_file, 1, NULL, s->bitmap_chunk,
233 c->delay, s->write_behind, bitmapsize, major)) {
7f91af49 234 goto abort;
c82f047c 235 }
a4e8316a 236 bitmap_fd = open(s->bitmap_file, O_RDWR);
c82f047c 237 if (bitmap_fd < 0) {
e7b84f9d 238 pr_err("%s cannot be openned.",
a4e8316a 239 s->bitmap_file);
7f91af49 240 goto abort;
c82f047c 241 }
aba69144 242 }
c82f047c
NB
243 if (bitmap_fd >= 0) {
244 if (ioctl(mdfd, SET_BITMAP_FILE, bitmap_fd) < 0) {
e7b84f9d 245 pr_err("Cannot set bitmap file for %s: %s\n",
c82f047c 246 mddev, strerror(errno));
7f91af49 247 goto abort;
c82f047c
NB
248 }
249 }
250 }
cd29a5c8 251 if (ioctl(mdfd, RUN_ARRAY, &param)) {
e7b84f9d 252 pr_err("RUN_ARRAY failed: %s\n",
82b27616 253 strerror(errno));
a4e8316a 254 if (s->chunk & (s->chunk-1)) {
e7b84f9d
N
255 cont_err("Problem may be that chunk size"
256 " is not a power of 2\n");
a252c078 257 }
82b27616
NB
258 goto abort;
259 }
260 } else {
cd29a5c8 261 unsigned long arg;
82b27616 262 arg=0;
a4e8316a 263 while (s->chunk > 4096) {
82b27616 264 arg++;
a4e8316a 265 s->chunk >>= 1;
82b27616 266 }
a4e8316a 267 if (s->level == 0)
45c8bd99
N
268 arg |= 0x20000;
269 else
270 arg |= 0x10000;
82b27616 271 if (ioctl(mdfd, START_MD, arg)) {
e7b84f9d 272 pr_err("START_MD failed: %s\n",
82b27616
NB
273 strerror(errno));
274 goto abort;
275 }
276 }
0c9e4afb 277 if (c->verbose >= 0)
e7b84f9d 278 pr_err("array %s built and started.\n",
dab6685f 279 mddev);
a7c6e3fb 280 wait_for(mddev, mdfd);
7f91af49 281 close(mdfd);
82b27616
NB
282 return 0;
283
284 abort:
cd29a5c8 285 if (vers >= 9000)
82b27616
NB
286 ioctl(mdfd, STOP_ARRAY, 0);
287 else
288 ioctl(mdfd, STOP_MD, 0);
7f91af49 289 close(mdfd);
82b27616 290 return 1;
64c4757e 291}