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Commit | Line | Data |
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64c4757e | 1 | /* |
9a9dab36 | 2 | * mdadm - manage Linux "md" devices aka RAID arrays. |
64c4757e | 3 | * |
cd29a5c8 | 4 | * Copyright (C) 2001-2002 Neil Brown <neilb@cse.unsw.edu.au> |
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 | |
22 | * Email: <neilb@cse.unsw.edu.au> | |
23 | * Paper: Neil Brown | |
24 | * School of Computer Science and Engineering | |
25 | * The University of New South Wales | |
26 | * Sydney, 2052 | |
27 | * Australia | |
28 | */ | |
29 | ||
9a9dab36 | 30 | #include "mdadm.h" |
682c7051 NB |
31 | #include "md_u.h" |
32 | #include "md_p.h" | |
64c4757e NB |
33 | |
34 | int Create(char *mddev, int mdfd, | |
682c7051 | 35 | int chunk, int level, int layout, int size, int raiddisks, int sparedisks, |
cd29a5c8 | 36 | int subdevs, mddev_dev_t devlist, |
52826846 | 37 | int runstop, int verbose, int force) |
64c4757e | 38 | { |
682c7051 NB |
39 | /* |
40 | * Create a new raid array. | |
41 | * | |
42 | * First check that necessary details are available | |
43 | * (i.e. level, raid-disks) | |
44 | * | |
45 | * Then check each disk to see what might be on it | |
46 | * and report anything interesting. | |
47 | * | |
48 | * If anything looks odd, and runstop not set, | |
49 | * abort. | |
50 | * | |
51 | * SET_ARRAY_INFO and ADD_NEW_DISK, and | |
52 | * if runstop==run, or raiddisks diskswere used, | |
53 | * RUN_ARRAY | |
54 | */ | |
55 | int minsize, maxsize; | |
cd29a5c8 NB |
56 | char *mindisc = NULL; |
57 | char *maxdisc = NULL; | |
682c7051 | 58 | int i; |
cd29a5c8 | 59 | mddev_dev_t dv; |
682c7051 | 60 | int fail=0, warn=0; |
82b27616 | 61 | struct stat stb; |
52826846 NB |
62 | int first_missing = MD_SB_DISKS*2; |
63 | int missing_disks = 0; | |
64 | int insert_point = MD_SB_DISKS*2; /* where to insert a missing drive */ | |
682c7051 NB |
65 | |
66 | mdu_array_info_t array; | |
682c7051 NB |
67 | |
68 | ||
69 | if (md_get_version(mdfd) < 9000) { | |
52826846 NB |
70 | fprintf(stderr, Name ": Create requires md driver verison 0.90.0 or later\n"); |
71 | return 1; | |
682c7051 NB |
72 | } |
73 | if (level == -10) { | |
74 | fprintf(stderr, | |
75 | Name ": a RAID level is needed to create an array.\n"); | |
76 | return 1; | |
77 | } | |
78 | if (raiddisks < 1) { | |
79 | fprintf(stderr, | |
80 | Name ": a number of --raid-disks must be given to create an array\n"); | |
81 | return 1; | |
82 | } | |
52826846 NB |
83 | if (raiddisks < 2 && level >= 4) { |
84 | fprintf(stderr, | |
85 | Name ": atleast 2 raid-disks needed for level 4 or 5\n"); | |
86 | return 1; | |
87 | } | |
682c7051 NB |
88 | if (raiddisks+sparedisks > MD_SB_DISKS) { |
89 | fprintf(stderr, | |
90 | Name ": too many discs requested: %d+%d > %d\n", | |
91 | raiddisks, sparedisks, MD_SB_DISKS); | |
92 | return 1; | |
93 | } | |
94 | if (subdevs > raiddisks+sparedisks) { | |
52826846 NB |
95 | fprintf(stderr, Name ": You have listed more disks (%d) than are in the array(%d)!\n", subdevs, raiddisks+sparedisks); |
96 | return 1; | |
682c7051 | 97 | } |
cd29a5c8 | 98 | if (subdevs < raiddisks+sparedisks) { |
52826846 NB |
99 | fprintf(stderr, Name ": You haven't given enough devices (real or missing) to create this array\n"); |
100 | return 1; | |
101 | } | |
102 | ||
682c7051 NB |
103 | /* now set some defaults */ |
104 | if (layout == -1) | |
105 | switch(level) { | |
106 | default: /* no layout */ | |
107 | layout = 0; | |
108 | break; | |
109 | case 5: | |
110 | layout = map_name(r5layout, "default"); | |
111 | if (verbose) | |
112 | fprintf(stderr, | |
113 | Name ": layout defaults to %s\n", map_num(r5layout, layout)); | |
114 | break; | |
115 | } | |
116 | ||
117 | if (chunk == 0) { | |
118 | chunk = 64; | |
119 | if (verbose) | |
120 | fprintf(stderr, Name ": chunk size defaults to 64K\n"); | |
121 | } | |
122 | ||
123 | /* now look at the subdevs */ | |
52826846 NB |
124 | array.active_disks = 0; |
125 | array.working_disks = 0; | |
cd29a5c8 NB |
126 | for (dv=devlist; dv; dv=dv->next) { |
127 | char *dname = dv->devname; | |
682c7051 | 128 | int dsize, freesize; |
52826846 | 129 | int fd; |
cd29a5c8 | 130 | if (strcasecmp(dname, "missing")==0) { |
52826846 NB |
131 | if (first_missing > i) |
132 | first_missing = i; | |
133 | missing_disks ++; | |
134 | continue; | |
135 | } | |
136 | array.working_disks++; | |
137 | if (i < raiddisks) | |
138 | array.active_disks++; | |
139 | fd = open(dname, O_RDONLY, 0); | |
682c7051 NB |
140 | if (fd <0 ) { |
141 | fprintf(stderr, Name ": Cannot open %s: %s\n", | |
142 | dname, strerror(errno)); | |
143 | fail=1; | |
144 | continue; | |
145 | } | |
146 | if (ioctl(fd, BLKGETSIZE, &dsize)) { | |
147 | fprintf(stderr, Name ": Cannot get size of %s: %s\n", | |
148 | dname, strerror(errno)); | |
149 | fail = 1; | |
150 | close(fd); | |
151 | continue; | |
152 | } | |
153 | if (dsize < MD_RESERVED_SECTORS*2) { | |
52826846 NB |
154 | fprintf(stderr, Name ": %s is too small: %dK\n", |
155 | dname, dsize/2); | |
156 | fail = 1; | |
157 | close(fd); | |
158 | continue; | |
682c7051 NB |
159 | } |
160 | freesize = MD_NEW_SIZE_SECTORS(dsize); | |
161 | freesize /= 2; | |
162 | ||
163 | if (size && freesize < size) { | |
52826846 NB |
164 | fprintf(stderr, Name ": %s is smaller that given size." |
165 | " %dK < %dK + superblock\n", dname, freesize, size); | |
166 | fail = 1; | |
167 | close(fd); | |
168 | continue; | |
682c7051 | 169 | } |
cd29a5c8 NB |
170 | if (maxdisc == NULL || (maxdisc && freesize > maxsize)) { |
171 | maxdisc = dname; | |
52826846 | 172 | maxsize = freesize; |
682c7051 | 173 | } |
cd29a5c8 NB |
174 | if (mindisc ==NULL || (mindisc && freesize < minsize)) { |
175 | mindisc = dname; | |
52826846 | 176 | minsize = freesize; |
682c7051 NB |
177 | } |
178 | warn |= check_ext2(fd, dname); | |
179 | warn |= check_reiser(fd, dname); | |
180 | warn |= check_raid(fd, dname); | |
181 | close(fd); | |
182 | } | |
183 | if (fail) { | |
52826846 NB |
184 | fprintf(stderr, Name ": create aborted\n"); |
185 | return 1; | |
682c7051 NB |
186 | } |
187 | if (size == 0) { | |
cd29a5c8 | 188 | if (mindisc == NULL) { |
52826846 NB |
189 | fprintf(stderr, Name ": no size and no drives given - aborting create.\n"); |
190 | return 1; | |
191 | } | |
192 | size = minsize; | |
193 | if (verbose && level>0) | |
194 | fprintf(stderr, Name ": size set to %dK\n", size); | |
682c7051 | 195 | } |
56eb10c0 | 196 | if (level >= 1 && ((maxsize-size)*100 > maxsize)) { |
e0d19036 | 197 | fprintf(stderr, Name ": largest drive (%s) exceed size (%dK) by more than 1%%\n", |
cd29a5c8 | 198 | maxdisc, size); |
52826846 | 199 | warn = 1; |
682c7051 NB |
200 | } |
201 | ||
202 | if (warn) { | |
52826846 NB |
203 | if (runstop!= 1) { |
204 | if (!ask("Continue creating array? ")) { | |
205 | fprintf(stderr, Name ": create aborted.\n"); | |
206 | return 1; | |
207 | } | |
208 | } else { | |
209 | if (verbose) | |
210 | fprintf(stderr, Name ": creation continuing despite oddities due to --run\n"); | |
682c7051 | 211 | } |
682c7051 NB |
212 | } |
213 | ||
52826846 NB |
214 | /* If this is raid5, we want to configure the last active slot |
215 | * as missing, so that a reconstruct happens (faster than re-parity) | |
216 | */ | |
217 | if (force == 0 && level == 5 && first_missing >= raiddisks) { | |
218 | insert_point = raiddisks-1; | |
219 | sparedisks++; | |
220 | array.active_disks--; | |
221 | missing_disks++; | |
222 | } | |
223 | ||
682c7051 NB |
224 | /* Ok, lets try some ioctls */ |
225 | ||
226 | array.level = level; | |
227 | array.size = size; | |
682c7051 | 228 | array.raid_disks = raiddisks; |
82b27616 NB |
229 | /* The kernel should *know* what md_minor we are dealing |
230 | * with, but it chooses to trust me instead. Sigh | |
231 | */ | |
682c7051 | 232 | array.md_minor = 0; |
82b27616 NB |
233 | if (fstat(mdfd, &stb)==0) |
234 | array.md_minor = MINOR(stb.st_rdev); | |
682c7051 | 235 | array.not_persistent = 0; |
52826846 NB |
236 | if (level == 5 && (insert_point < raiddisks || first_missing < raiddisks)) |
237 | array.state = 1; /* clean, but one drive will be missing */ | |
82b27616 | 238 | else |
52826846 | 239 | array.state = 0; /* not clean, but no errors */ |
82b27616 NB |
240 | |
241 | /* There is lots of redundancy in these disk counts, | |
242 | * raid_disks is the most meaningful value | |
243 | * it describes the geometry of the array | |
244 | * it is constant | |
245 | * nr_disks is total number of used slots. | |
246 | * it should be raid_disks+spare_disks | |
247 | * spare_disks is the number of extra disks present | |
248 | * see above | |
249 | * active_disks is the number of working disks in | |
250 | * active slots. (With raid_disks) | |
251 | * working_disks is the total number of working disks, | |
252 | * including spares | |
253 | * failed_disks is the number of disks marked failed | |
254 | * | |
255 | * Ideally, the kernel would keep these (except raid_disks) | |
256 | * up-to-date as we ADD_NEW_DISK, but it doesn't (yet). | |
257 | * So for now, we assume that all raid and spare | |
258 | * devices will be given. | |
259 | */ | |
52826846 NB |
260 | array.spare_disks=sparedisks; |
261 | array.failed_disks=missing_disks; | |
262 | array.nr_disks = array.working_disks + array.failed_disks; | |
682c7051 NB |
263 | array.layout = layout; |
264 | array.chunk_size = chunk*1024; | |
265 | ||
266 | if (ioctl(mdfd, SET_ARRAY_INFO, &array)) { | |
52826846 NB |
267 | fprintf(stderr, Name ": SET_ARRAY_INFO failed for %s: %s\n", |
268 | mddev, strerror(errno)); | |
269 | return 1; | |
682c7051 NB |
270 | } |
271 | ||
cd29a5c8 | 272 | for (i=0, dv = devlist ; dv ; dv=dv->next, i++) { |
52826846 NB |
273 | int fd; |
274 | struct stat stb; | |
275 | mdu_disk_info_t disk; | |
276 | ||
277 | disk.number = i; | |
278 | if (i >= insert_point) | |
279 | disk.number++; | |
280 | disk.raid_disk = disk.number; | |
281 | if (disk.raid_disk < raiddisks) | |
282 | disk.state = 6; /* active and in sync */ | |
283 | else | |
284 | disk.state = 0; | |
cd29a5c8 | 285 | if (strcasecmp(dv->devname, "missing")==0) { |
52826846 NB |
286 | disk.major = 0; |
287 | disk.minor = 0; | |
288 | disk.state = 1; /* faulty */ | |
289 | } else { | |
cd29a5c8 | 290 | fd = open(dv->devname, O_RDONLY, 0); |
52826846 NB |
291 | if (fd < 0) { |
292 | fprintf(stderr, Name ": failed to open %s after earlier success - aborting\n", | |
cd29a5c8 | 293 | dv->devname); |
52826846 NB |
294 | return 1; |
295 | } | |
296 | fstat(fd, &stb); | |
297 | disk.major = MAJOR(stb.st_rdev); | |
298 | disk.minor = MINOR(stb.st_rdev); | |
299 | close(fd); | |
300 | } | |
301 | if (ioctl(mdfd, ADD_NEW_DISK, &disk)) { | |
302 | fprintf(stderr, Name ": ADD_NEW_DISK for %s failed: %s\n", | |
cd29a5c8 | 303 | dv->devname, strerror(errno)); |
52826846 NB |
304 | return 1; |
305 | } | |
682c7051 NB |
306 | } |
307 | ||
52826846 | 308 | if (insert_point < MD_SB_DISKS) { |
5e52ae9e | 309 | mdu_disk_info_t disk; |
52826846 | 310 | disk.number = insert_point; |
5e52ae9e NB |
311 | disk.raid_disk = disk.number; |
312 | disk.state = 1; /* faulty */ | |
313 | disk.major = disk.minor = 0; | |
314 | ioctl(mdfd,ADD_NEW_DISK, &disk); | |
315 | } | |
316 | ||
682c7051 NB |
317 | /* param is not actually used */ |
318 | if (runstop == 1 || subdevs >= raiddisks) { | |
82b27616 | 319 | mdu_param_t param; |
682c7051 NB |
320 | if (ioctl(mdfd, RUN_ARRAY, ¶m)) { |
321 | fprintf(stderr, Name ": RUN_ARRAY failed: %s\n", | |
322 | strerror(errno)); | |
323 | return 1; | |
324 | } | |
325 | fprintf(stderr, Name ": array %s started.\n", mddev); | |
326 | } else { | |
327 | fprintf(stderr, Name ": not starting array - not enough discs.\n"); | |
328 | } | |
329 | return 0; | |
64c4757e | 330 | } |