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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, int chunk, int level, int layout, | |
32 | int raiddisks, struct mddev_dev *devlist, int assume_clean, | |
33 | char *bitmap_file, int bitmap_chunk, int write_behind, | |
34 | int delay, int verbose, int autof, unsigned long long size) | |
35 | { | |
36 | /* Build a linear or raid0 arrays without superblocks | |
37 | * We cannot really do any checks, we just do it. | |
38 | * For md_version < 0.90.0, we call REGISTER_DEV | |
39 | * with the device numbers, and then | |
40 | * START_MD giving the "geometry" | |
41 | * geometry is 0xpp00cc | |
42 | * where pp is personality: 1==linear, 2=raid0 | |
43 | * cc = chunk size factor: 0==4k, 1==8k etc. | |
44 | * | |
45 | * For md_version >= 0.90.0 we call | |
46 | * SET_ARRAY_INFO, ADD_NEW_DISK, RUN_ARRAY | |
47 | * | |
48 | */ | |
49 | int i; | |
50 | int vers; | |
51 | struct stat stb; | |
52 | int subdevs = 0, missing_disks = 0; | |
53 | struct mddev_dev *dv; | |
54 | int bitmap_fd; | |
55 | unsigned long long bitmapsize; | |
56 | int mdfd; | |
57 | char chosen_name[1024]; | |
58 | int uuid[4] = {0,0,0,0}; | |
59 | struct map_ent *map = NULL; | |
60 | ||
61 | /* scan all devices, make sure they really are block devices */ | |
62 | for (dv = devlist; dv; dv=dv->next) { | |
63 | subdevs++; | |
64 | if (strcmp("missing", dv->devname) == 0) { | |
65 | missing_disks++; | |
66 | continue; | |
67 | } | |
68 | if (stat(dv->devname, &stb)) { | |
69 | fprintf(stderr, Name ": Cannot find %s: %s\n", | |
70 | dv->devname, strerror(errno)); | |
71 | return 1; | |
72 | } | |
73 | if ((stb.st_mode & S_IFMT) != S_IFBLK) { | |
74 | fprintf(stderr, Name ": %s is not a block device.\n", | |
75 | dv->devname); | |
76 | return 1; | |
77 | } | |
78 | } | |
79 | ||
80 | if (raiddisks != subdevs) { | |
81 | fprintf(stderr, Name ": requested %d devices in array but listed %d\n", | |
82 | raiddisks, subdevs); | |
83 | return 1; | |
84 | } | |
85 | ||
86 | if (layout == UnSet) | |
87 | switch(level) { | |
88 | default: /* no layout */ | |
89 | layout = 0; | |
90 | break; | |
91 | case 10: | |
92 | layout = 0x102; /* near=2, far=1 */ | |
93 | if (verbose > 0) | |
94 | fprintf(stderr, | |
95 | Name ": layout defaults to n1\n"); | |
96 | break; | |
97 | case 5: | |
98 | case 6: | |
99 | layout = map_name(r5layout, "default"); | |
100 | if (verbose > 0) | |
101 | fprintf(stderr, | |
102 | Name ": layout defaults to %s\n", map_num(r5layout, layout)); | |
103 | break; | |
104 | case LEVEL_FAULTY: | |
105 | layout = map_name(faultylayout, "default"); | |
106 | ||
107 | if (verbose > 0) | |
108 | fprintf(stderr, | |
109 | Name ": layout defaults to %s\n", map_num(faultylayout, layout)); | |
110 | break; | |
111 | } | |
112 | ||
113 | /* We need to create the device. It can have no name. */ | |
114 | map_lock(&map); | |
115 | mdfd = create_mddev(mddev, NULL, autof, LOCAL, | |
116 | chosen_name); | |
117 | if (mdfd < 0) { | |
118 | map_unlock(&map); | |
119 | return 1; | |
120 | } | |
121 | mddev = chosen_name; | |
122 | ||
123 | map_update(&map, fd2devnum(mdfd), "none", uuid, chosen_name); | |
124 | map_unlock(&map); | |
125 | ||
126 | vers = md_get_version(mdfd); | |
127 | ||
128 | /* looks Ok, go for it */ | |
129 | if (vers >= 9000) { | |
130 | mdu_array_info_t array; | |
131 | array.level = level; | |
132 | array.size = size; | |
133 | array.nr_disks = raiddisks; | |
134 | array.raid_disks = raiddisks; | |
135 | array.md_minor = 0; | |
136 | if (fstat(mdfd, &stb)==0) | |
137 | array.md_minor = minor(stb.st_rdev); | |
138 | array.not_persistent = 1; | |
139 | array.state = 0; /* not clean, but no errors */ | |
140 | if (assume_clean) | |
141 | array.state |= 1; | |
142 | array.active_disks = raiddisks - missing_disks; | |
143 | array.working_disks = raiddisks - missing_disks; | |
144 | array.spare_disks = 0; | |
145 | array.failed_disks = missing_disks; | |
146 | if (chunk == 0 && (level==0 || level==LEVEL_LINEAR)) | |
147 | chunk = 64; | |
148 | array.chunk_size = chunk*1024; | |
149 | array.layout = layout; | |
150 | if (ioctl(mdfd, SET_ARRAY_INFO, &array)) { | |
151 | fprintf(stderr, Name ": SET_ARRAY_INFO failed for %s: %s\n", | |
152 | mddev, strerror(errno)); | |
153 | goto abort; | |
154 | } | |
155 | } else if (bitmap_file) { | |
156 | fprintf(stderr, Name ": bitmaps not supported with this kernel\n"); | |
157 | goto abort; | |
158 | } | |
159 | ||
160 | if (bitmap_file && level <= 0) { | |
161 | fprintf(stderr, Name ": bitmaps not meaningful with level %s\n", | |
162 | map_num(pers, level)?:"given"); | |
163 | goto abort; | |
164 | } | |
165 | /* now add the devices */ | |
166 | for ((i=0), (dv = devlist) ; dv ; i++, dv=dv->next) { | |
167 | unsigned long long dsize; | |
168 | int fd; | |
169 | if (strcmp("missing", dv->devname) == 0) | |
170 | continue; | |
171 | if (stat(dv->devname, &stb)) { | |
172 | fprintf(stderr, Name ": Weird: %s has disappeared.\n", | |
173 | dv->devname); | |
174 | goto abort; | |
175 | } | |
176 | if ((stb.st_mode & S_IFMT)!= S_IFBLK) { | |
177 | fprintf(stderr, Name ": Wierd: %s is no longer a block device.\n", | |
178 | dv->devname); | |
179 | goto abort; | |
180 | } | |
181 | fd = open(dv->devname, O_RDONLY|O_EXCL); | |
182 | if (fd < 0) { | |
183 | fprintf(stderr, Name ": Cannot open %s: %s\n", | |
184 | dv->devname, strerror(errno)); | |
185 | goto abort; | |
186 | } | |
187 | if (get_dev_size(fd, NULL, &dsize) && | |
188 | (size == 0 || dsize < size)) | |
189 | size = dsize; | |
190 | close(fd); | |
191 | if (vers >= 9000) { | |
192 | mdu_disk_info_t disk; | |
193 | disk.number = i; | |
194 | disk.raid_disk = i; | |
195 | disk.state = (1<<MD_DISK_SYNC) | (1<<MD_DISK_ACTIVE); | |
196 | if (dv->writemostly == 1) | |
197 | disk.state |= 1<<MD_DISK_WRITEMOSTLY; | |
198 | disk.major = major(stb.st_rdev); | |
199 | disk.minor = minor(stb.st_rdev); | |
200 | if (ioctl(mdfd, ADD_NEW_DISK, &disk)) { | |
201 | fprintf(stderr, Name ": ADD_NEW_DISK failed for %s: %s\n", | |
202 | dv->devname, strerror(errno)); | |
203 | goto abort; | |
204 | } | |
205 | } else { | |
206 | if (ioctl(mdfd, REGISTER_DEV, &stb.st_rdev)) { | |
207 | fprintf(stderr, Name ": REGISTER_DEV failed for %s: %s.\n", | |
208 | dv->devname, strerror(errno)); | |
209 | goto abort; | |
210 | } | |
211 | } | |
212 | } | |
213 | /* now to start it */ | |
214 | if (vers >= 9000) { | |
215 | mdu_param_t param; /* not used by syscall */ | |
216 | if (bitmap_file) { | |
217 | bitmap_fd = open(bitmap_file, O_RDWR); | |
218 | if (bitmap_fd < 0) { | |
219 | int major = BITMAP_MAJOR_HI; | |
220 | #if 0 | |
221 | if (bitmap_chunk == UnSet) { | |
222 | fprintf(stderr, Name ": %s cannot be openned.", | |
223 | bitmap_file); | |
224 | goto abort; | |
225 | } | |
226 | #endif | |
227 | if (vers < 9003) { | |
228 | major = BITMAP_MAJOR_HOSTENDIAN; | |
229 | #ifdef __BIG_ENDIAN | |
230 | fprintf(stderr, Name ": Warning - bitmaps created on this kernel are not portable\n" | |
231 | " between different architectures. Consider upgrading the Linux kernel.\n"); | |
232 | #endif | |
233 | } | |
234 | bitmapsize = size>>9; /* FIXME wrong for RAID10 */ | |
235 | if (CreateBitmap(bitmap_file, 1, NULL, bitmap_chunk, | |
236 | delay, write_behind, bitmapsize, major)) { | |
237 | goto abort; | |
238 | } | |
239 | bitmap_fd = open(bitmap_file, O_RDWR); | |
240 | if (bitmap_fd < 0) { | |
241 | fprintf(stderr, Name ": %s cannot be openned.", | |
242 | bitmap_file); | |
243 | goto abort; | |
244 | } | |
245 | } | |
246 | if (bitmap_fd >= 0) { | |
247 | if (ioctl(mdfd, SET_BITMAP_FILE, bitmap_fd) < 0) { | |
248 | fprintf(stderr, Name ": Cannot set bitmap file for %s: %s\n", | |
249 | mddev, strerror(errno)); | |
250 | goto abort; | |
251 | } | |
252 | } | |
253 | } | |
254 | if (ioctl(mdfd, RUN_ARRAY, ¶m)) { | |
255 | fprintf(stderr, Name ": RUN_ARRAY failed: %s\n", | |
256 | strerror(errno)); | |
257 | goto abort; | |
258 | } | |
259 | } else { | |
260 | unsigned long arg; | |
261 | arg=0; | |
262 | while (chunk > 4096) { | |
263 | arg++; | |
264 | chunk >>= 1; | |
265 | } | |
266 | if (level == 0) | |
267 | chunk |= 0x20000; | |
268 | else chunk |= 0x10000; | |
269 | if (ioctl(mdfd, START_MD, arg)) { | |
270 | fprintf(stderr, Name ": START_MD failed: %s\n", | |
271 | strerror(errno)); | |
272 | goto abort; | |
273 | } | |
274 | } | |
275 | if (verbose >= 0) | |
276 | fprintf(stderr, Name ": array %s built and started.\n", | |
277 | mddev); | |
278 | wait_for(mddev, mdfd); | |
279 | close(mdfd); | |
280 | return 0; | |
281 | ||
282 | abort: | |
283 | if (vers >= 9000) | |
284 | ioctl(mdfd, STOP_ARRAY, 0); | |
285 | else | |
286 | ioctl(mdfd, STOP_MD, 0); | |
287 | close(mdfd); | |
288 | return 1; | |
289 | } |