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1 | /* | |
2 | * mdadm - manage Linux "md" devices aka RAID arrays. | |
3 | * | |
4 | * Copyright (C) 2001-2009 Neil Brown <neilb@suse.de> | |
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@suse.de> | |
23 | */ | |
24 | ||
25 | #include "mdadm.h" | |
26 | ||
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 | ||
31 | int Build(char *mddev, struct mddev_dev *devlist, | |
32 | struct shape *s, struct context *c) | |
33 | { | |
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; | |
50 | int subdevs = 0, missing_disks = 0; | |
51 | struct mddev_dev *dv; | |
52 | int bitmap_fd; | |
53 | unsigned long long bitmapsize; | |
54 | int mdfd; | |
55 | char chosen_name[1024]; | |
56 | int uuid[4] = {0,0,0,0}; | |
57 | struct map_ent *map = NULL; | |
58 | ||
59 | /* scan all devices, make sure they really are block devices */ | |
60 | for (dv = devlist; dv; dv=dv->next) { | |
61 | subdevs++; | |
62 | if (strcmp("missing", dv->devname) == 0) { | |
63 | missing_disks++; | |
64 | continue; | |
65 | } | |
66 | if (stat(dv->devname, &stb)) { | |
67 | pr_err("Cannot find %s: %s\n", | |
68 | dv->devname, strerror(errno)); | |
69 | return 1; | |
70 | } | |
71 | if ((stb.st_mode & S_IFMT) != S_IFBLK) { | |
72 | pr_err("%s is not a block device.\n", | |
73 | dv->devname); | |
74 | return 1; | |
75 | } | |
76 | } | |
77 | ||
78 | if (s->raiddisks != subdevs) { | |
79 | pr_err("requested %d devices in array but listed %d\n", | |
80 | s->raiddisks, subdevs); | |
81 | return 1; | |
82 | } | |
83 | ||
84 | if (s->layout == UnSet) | |
85 | switch(s->level) { | |
86 | default: /* no layout */ | |
87 | s->layout = 0; | |
88 | break; | |
89 | case 10: | |
90 | s->layout = 0x102; /* near=2, far=1 */ | |
91 | if (c->verbose > 0) | |
92 | pr_err("layout defaults to n1\n"); | |
93 | break; | |
94 | case 5: | |
95 | case 6: | |
96 | s->layout = map_name(r5layout, "default"); | |
97 | if (c->verbose > 0) | |
98 | pr_err("layout defaults to %s\n", map_num(r5layout, s->layout)); | |
99 | break; | |
100 | case LEVEL_FAULTY: | |
101 | s->layout = map_name(faultylayout, "default"); | |
102 | ||
103 | if (c->verbose > 0) | |
104 | pr_err("layout defaults to %s\n", map_num(faultylayout, s->layout)); | |
105 | break; | |
106 | } | |
107 | ||
108 | /* We need to create the device. It can have no name. */ | |
109 | map_lock(&map); | |
110 | mdfd = create_mddev(mddev, NULL, c->autof, LOCAL, | |
111 | chosen_name); | |
112 | if (mdfd < 0) { | |
113 | map_unlock(&map); | |
114 | return 1; | |
115 | } | |
116 | mddev = chosen_name; | |
117 | ||
118 | map_update(&map, fd2devnm(mdfd), "none", uuid, chosen_name); | |
119 | map_unlock(&map); | |
120 | ||
121 | vers = md_get_version(mdfd); | |
122 | ||
123 | /* looks Ok, go for it */ | |
124 | if (vers >= 9000) { | |
125 | mdu_array_info_t array; | |
126 | array.level = s->level; | |
127 | if (s->size == MAX_SIZE) | |
128 | s->size = 0; | |
129 | array.size = s->size; | |
130 | array.nr_disks = s->raiddisks; | |
131 | array.raid_disks = s->raiddisks; | |
132 | array.md_minor = 0; | |
133 | if (fstat(mdfd, &stb)==0) | |
134 | array.md_minor = minor(stb.st_rdev); | |
135 | array.not_persistent = 1; | |
136 | array.state = 0; /* not clean, but no errors */ | |
137 | if (s->assume_clean) | |
138 | array.state |= 1; | |
139 | array.active_disks = s->raiddisks - missing_disks; | |
140 | array.working_disks = s->raiddisks - missing_disks; | |
141 | array.spare_disks = 0; | |
142 | array.failed_disks = missing_disks; | |
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; | |
147 | if (ioctl(mdfd, SET_ARRAY_INFO, &array)) { | |
148 | pr_err("SET_ARRAY_INFO failed for %s: %s\n", | |
149 | mddev, strerror(errno)); | |
150 | goto abort; | |
151 | } | |
152 | } else if (s->bitmap_file) { | |
153 | pr_err("bitmaps not supported with this kernel\n"); | |
154 | goto abort; | |
155 | } | |
156 | ||
157 | if (s->bitmap_file && strcmp(s->bitmap_file, "none") == 0) | |
158 | s->bitmap_file = NULL; | |
159 | if (s->bitmap_file && s->level <= 0) { | |
160 | pr_err("bitmaps not meaningful with level %s\n", | |
161 | map_num(pers, s->level)?:"given"); | |
162 | goto abort; | |
163 | } | |
164 | /* now add the devices */ | |
165 | for ((i=0), (dv = devlist) ; dv ; i++, dv=dv->next) { | |
166 | unsigned long long dsize; | |
167 | int fd; | |
168 | if (strcmp("missing", dv->devname) == 0) | |
169 | continue; | |
170 | if (stat(dv->devname, &stb)) { | |
171 | pr_err("Weird: %s has disappeared.\n", | |
172 | dv->devname); | |
173 | goto abort; | |
174 | } | |
175 | if ((stb.st_mode & S_IFMT)!= S_IFBLK) { | |
176 | pr_err("Weird: %s is no longer a block device.\n", | |
177 | dv->devname); | |
178 | goto abort; | |
179 | } | |
180 | fd = open(dv->devname, O_RDONLY|O_EXCL); | |
181 | if (fd < 0) { | |
182 | pr_err("Cannot open %s: %s\n", | |
183 | dv->devname, strerror(errno)); | |
184 | goto abort; | |
185 | } | |
186 | if (get_dev_size(fd, NULL, &dsize) && | |
187 | (s->size == 0 || s->size == MAX_SIZE || dsize < s->size)) | |
188 | s->size = dsize; | |
189 | close(fd); | |
190 | if (vers >= 9000) { | |
191 | mdu_disk_info_t disk; | |
192 | disk.number = i; | |
193 | disk.raid_disk = i; | |
194 | disk.state = (1<<MD_DISK_SYNC) | (1<<MD_DISK_ACTIVE); | |
195 | if (dv->writemostly == 1) | |
196 | disk.state |= 1<<MD_DISK_WRITEMOSTLY; | |
197 | disk.major = major(stb.st_rdev); | |
198 | disk.minor = minor(stb.st_rdev); | |
199 | if (ioctl(mdfd, ADD_NEW_DISK, &disk)) { | |
200 | pr_err("ADD_NEW_DISK failed for %s: %s\n", | |
201 | dv->devname, strerror(errno)); | |
202 | goto abort; | |
203 | } | |
204 | } else { | |
205 | if (ioctl(mdfd, REGISTER_DEV, &stb.st_rdev)) { | |
206 | pr_err("REGISTER_DEV failed for %s: %s.\n", | |
207 | dv->devname, strerror(errno)); | |
208 | goto abort; | |
209 | } | |
210 | } | |
211 | } | |
212 | /* now to start it */ | |
213 | if (vers >= 9000) { | |
214 | mdu_param_t param; /* not used by syscall */ | |
215 | if (s->bitmap_file) { | |
216 | bitmap_fd = open(s->bitmap_file, O_RDWR); | |
217 | if (bitmap_fd < 0) { | |
218 | int major = BITMAP_MAJOR_HI; | |
219 | #if 0 | |
220 | if (s->bitmap_chunk == UnSet) { | |
221 | pr_err("%s cannot be openned.", | |
222 | s->bitmap_file); | |
223 | goto abort; | |
224 | } | |
225 | #endif | |
226 | if (vers < 9003) { | |
227 | major = BITMAP_MAJOR_HOSTENDIAN; | |
228 | #ifdef __BIG_ENDIAN | |
229 | pr_err("Warning - bitmaps created on this kernel are not portable\n" | |
230 | " between different architectures. Consider upgrading the Linux kernel.\n"); | |
231 | #endif | |
232 | } | |
233 | bitmapsize = s->size>>9; /* FIXME wrong for RAID10 */ | |
234 | if (CreateBitmap(s->bitmap_file, 1, NULL, s->bitmap_chunk, | |
235 | c->delay, s->write_behind, bitmapsize, major)) { | |
236 | goto abort; | |
237 | } | |
238 | bitmap_fd = open(s->bitmap_file, O_RDWR); | |
239 | if (bitmap_fd < 0) { | |
240 | pr_err("%s cannot be openned.", | |
241 | s->bitmap_file); | |
242 | goto abort; | |
243 | } | |
244 | } | |
245 | if (bitmap_fd >= 0) { | |
246 | if (ioctl(mdfd, SET_BITMAP_FILE, bitmap_fd) < 0) { | |
247 | pr_err("Cannot set bitmap file for %s: %s\n", | |
248 | mddev, strerror(errno)); | |
249 | goto abort; | |
250 | } | |
251 | } | |
252 | } | |
253 | if (ioctl(mdfd, RUN_ARRAY, ¶m)) { | |
254 | pr_err("RUN_ARRAY failed: %s\n", | |
255 | strerror(errno)); | |
256 | if (s->chunk & (s->chunk-1)) { | |
257 | cont_err("Problem may be that chunk size is not a power of 2\n"); | |
258 | } | |
259 | goto abort; | |
260 | } | |
261 | } else { | |
262 | unsigned long arg; | |
263 | arg=0; | |
264 | while (s->chunk > 4096) { | |
265 | arg++; | |
266 | s->chunk >>= 1; | |
267 | } | |
268 | if (s->level == 0) | |
269 | arg |= 0x20000; | |
270 | else | |
271 | arg |= 0x10000; | |
272 | if (ioctl(mdfd, START_MD, arg)) { | |
273 | pr_err("START_MD failed: %s\n", | |
274 | strerror(errno)); | |
275 | goto abort; | |
276 | } | |
277 | } | |
278 | if (c->verbose >= 0) | |
279 | pr_err("array %s built and started.\n", | |
280 | mddev); | |
281 | wait_for(mddev, mdfd); | |
282 | close(mdfd); | |
283 | return 0; | |
284 | ||
285 | abort: | |
286 | if (vers >= 9000) | |
287 | ioctl(mdfd, STOP_ARRAY, 0); | |
288 | else | |
289 | ioctl(mdfd, STOP_MD, 0); | |
290 | close(mdfd); | |
291 | return 1; | |
292 | } |