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74db60b0 N |
1 | /* |
2 | * mdadm - manage Linux "md" devices aka RAID arrays. | |
3 | * | |
4 | * Copyright (C) 2013 Neil Brown <neilb@suse.de> | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or modify | |
7 | * it under the terms of the GNU General Public License as published by | |
8 | * the Free Software Foundation; either version 2 of the License, or | |
9 | * (at your option) any later version. | |
10 | * | |
11 | * This program is distributed in the hope that it will be useful, | |
12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
14 | * GNU General Public License for more details. | |
15 | ||
16 | * Author: Neil Brown | |
17 | * Email: <neilb@suse.de> | |
18 | */ | |
19 | ||
20 | #include "mdadm.h" | |
21 | #include <sys/dir.h> | |
22 | ||
23 | int Dump_metadata(char *dev, char *dir, struct context *c, | |
24 | struct supertype *st) | |
25 | { | |
26 | /* create a new file in 'dir' named for the basename of 'dev'. | |
27 | * Truncate to the same size as 'dev' and ask the metadata | |
28 | * handler to copy metadata there. | |
29 | * For every name in /dev/disk/by-id that points to this device, | |
30 | * create a hardlink in 'dir'. | |
31 | * Complain if any of those hardlinks cannot be created. | |
32 | */ | |
33 | int fd, fl; | |
34 | struct stat stb, dstb; | |
35 | char *base; | |
36 | char *fname = NULL; | |
37 | unsigned long long size; | |
38 | DIR *dirp; | |
39 | struct dirent *de; | |
40 | ||
41 | if (stat(dir, &stb) != 0 || | |
42 | (S_IFMT & stb.st_mode) != S_IFDIR) { | |
43 | pr_err("--dump requires an existing directory, not: %s\n", | |
44 | dir); | |
45 | return 16; | |
46 | } | |
47 | ||
48 | fd = dev_open(dev, O_RDONLY); | |
49 | if (fd < 0) { | |
50 | pr_err("Cannot open %s to dump metadata: %s\n", | |
51 | dev, strerror(errno)); | |
52 | return 1; | |
53 | } | |
54 | if (!get_dev_size(fd, dev, &size)) { | |
55 | close(fd); | |
56 | return 1; | |
57 | } | |
58 | ||
59 | if (st == NULL) | |
60 | st = guess_super_type(fd, guess_array); | |
61 | if (!st) { | |
62 | pr_err("Cannot find RAID metadata on %s\n", dev); | |
63 | close(fd); | |
64 | return 1; | |
65 | } | |
66 | ||
67 | st->ignore_hw_compat = 1; | |
68 | if (st->ss->load_super(st, fd, NULL) != 0) { | |
69 | pr_err("No %s metadata found on %s\n", | |
70 | st->ss->name, dev); | |
71 | close(fd); | |
72 | return 1; | |
73 | } | |
74 | if (st->ss->copy_metadata == NULL) { | |
75 | pr_err("%s metadata on %s cannot be copied\n", | |
76 | st->ss->name, dev); | |
77 | close(fd); | |
78 | return 1; | |
79 | } | |
80 | ||
81 | base = strrchr(dev, '/'); | |
82 | if (base) | |
83 | base++; | |
84 | else | |
85 | base = dev; | |
86 | xasprintf(&fname, "%s/%s", dir, base); | |
87 | fl = open(fname, O_RDWR|O_CREAT|O_EXCL, 0666); | |
88 | if (fl < 0) { | |
89 | pr_err("Cannot create dump file %s: %s\n", | |
90 | fname, strerror(errno)); | |
91 | close(fd); | |
92 | free(fname); | |
93 | return 1; | |
94 | } | |
95 | if (ftruncate(fl, size) < 0) { | |
96 | pr_err("failed to set size of dump file: %s\n", | |
97 | strerror(errno)); | |
98 | close(fd); | |
99 | close(fl); | |
100 | free(fname); | |
101 | return 1; | |
102 | } | |
103 | ||
104 | if (st->ss->copy_metadata(st, fd, fl) != 0) { | |
105 | pr_err("Failed to copy metadata from %s to %s\n", | |
106 | dev, fname); | |
107 | close(fd); | |
108 | close(fl); | |
109 | unlink(fname); | |
110 | free(fname); | |
111 | return 1; | |
112 | } | |
113 | if (c->verbose >= 0) | |
114 | printf("%s saved as %s.\n", dev, fname); | |
115 | fstat(fd, &dstb); | |
116 | close(fd); | |
117 | close(fl); | |
118 | if ((dstb.st_mode & S_IFMT) != S_IFBLK) { | |
119 | /* Not a block device, so cannot create links */ | |
120 | free(fname); | |
121 | return 0; | |
122 | } | |
123 | /* mostly done: just want to find some other names */ | |
124 | dirp = opendir("/dev/disk/by-id"); | |
125 | if (!dirp) { | |
126 | free(fname); | |
127 | return 0; | |
128 | } | |
129 | while ((de = readdir(dirp)) != NULL) { | |
130 | char *p = NULL; | |
131 | if (de->d_name[0] == '.') | |
132 | continue; | |
133 | xasprintf(&p, "/dev/disk/by-id/%s", de->d_name); | |
134 | if (stat(p, &stb) != 0 || | |
135 | (stb.st_mode & S_IFMT) != S_IFBLK || | |
136 | stb.st_rdev != dstb.st_rdev) { | |
137 | /* Not this one */ | |
138 | free(p); | |
139 | continue; | |
140 | } | |
141 | free(p); | |
142 | xasprintf(&p, "%s/%s", dir, de->d_name); | |
143 | if (link(fname, p) == 0) { | |
144 | if (c->verbose >= 0) | |
145 | printf("%s also saved as %s.\n", | |
146 | dev, p); | |
147 | } else { | |
148 | pr_err("Could not save %s as %s!!\n", | |
149 | dev, p); | |
150 | } | |
151 | free(p); | |
152 | } | |
153 | closedir(dirp); | |
154 | free(fname); | |
155 | return 0; | |
156 | } | |
157 | ||
158 | int Restore_metadata(char *dev, char *dir, struct context *c, | |
159 | struct supertype *st, int only) | |
160 | { | |
161 | /* If 'dir' really is a directory we choose a name | |
162 | * from it that matches a suitable name in /dev/disk/by-id, | |
163 | * and copy metadata from the file to the device. | |
164 | * If two names from by-id match and aren't both the same | |
165 | * inode, we fail. If none match and basename of 'dev' | |
166 | * can be found in dir, use that. | |
167 | * If 'dir' is really a file then it is only permitted if | |
168 | * 'only' is set (meaning there was only one device given) | |
169 | * and the metadata is restored irrespective of file names. | |
170 | */ | |
171 | int fd, fl; | |
172 | struct stat stb, dstb; | |
173 | char *fname = NULL; | |
174 | unsigned long long size; | |
175 | ||
176 | if (stat(dir, &stb) != 0) { | |
177 | pr_err("%s does not exist: cannot restore from there.\n", | |
178 | dir); | |
179 | return 16; | |
180 | } else if ((S_IFMT & stb.st_mode) != S_IFDIR && !only) { | |
181 | pr_err("--restore requires a directory when multiple devices given\n"); | |
182 | return 16; | |
183 | } | |
184 | ||
185 | fd = dev_open(dev, O_RDWR); | |
186 | if (fd < 0) { | |
187 | pr_err("Cannot open %s to restore metadata: %s\n", | |
188 | dev, strerror(errno)); | |
189 | return 1; | |
190 | } | |
191 | if (!get_dev_size(fd, dev, &size)) { | |
192 | close(fd); | |
193 | return 1; | |
194 | } | |
195 | ||
196 | if ((S_IFMT & stb.st_mode) == S_IFDIR) { | |
197 | /* choose one name from the directory. */ | |
198 | DIR *d = opendir(dir); | |
199 | struct dirent *de; | |
200 | char *chosen = NULL; | |
201 | unsigned int chosen_inode = 0; | |
202 | ||
203 | fstat(fd, &dstb); | |
204 | ||
205 | while (d && (de = readdir(d)) != NULL) { | |
206 | if (de->d_name[0] == '.') | |
207 | continue; | |
208 | xasprintf(&fname, "/dev/disk/by-id/%s", de->d_name); | |
209 | if (stat(fname, &stb) != 0) { | |
210 | free(fname); | |
211 | continue; | |
212 | } | |
213 | free(fname); | |
214 | if ((S_IFMT & stb.st_mode) != S_IFBLK) | |
215 | continue; | |
216 | if (stb.st_rdev != dstb.st_rdev) | |
217 | continue; | |
218 | /* This file is a good match for our device. */ | |
219 | xasprintf(&fname, "%s/%s", dir, de->d_name); | |
220 | if (stat(fname, &stb) != 0) { | |
221 | /* Weird! */ | |
222 | free(fname); | |
223 | continue; | |
224 | } | |
225 | if (chosen == NULL) { | |
226 | chosen = fname; | |
227 | chosen_inode = stb.st_ino; | |
228 | continue; | |
229 | } | |
230 | if (chosen_inode == stb.st_ino) { | |
231 | /* same, no need to change */ | |
232 | free(fname); | |
233 | continue; | |
234 | } | |
235 | /* Oh dear, two names both match. Must give up. */ | |
236 | pr_err("Both %s and %s seem suitable for %s. Please choose one.\n", | |
237 | chosen, fname, dev); | |
238 | free(fname); | |
239 | free(chosen); | |
240 | close(fd); | |
241 | closedir(d); | |
242 | return 1; | |
243 | } | |
244 | closedir(d); | |
245 | if (!chosen) { | |
246 | /* One last chance: try basename of device */ | |
247 | char *base = strrchr(dev, '/'); | |
248 | if (base) | |
249 | base++; | |
250 | else | |
251 | base = dev; | |
252 | xasprintf(&fname, "%s/%s", dir, base); | |
253 | if (stat(fname, &stb) == 0) | |
254 | chosen = fname; | |
255 | else | |
256 | free(fname); | |
257 | } | |
258 | fname = chosen; | |
259 | } else | |
260 | fname = strdup(dir); | |
261 | ||
262 | if (!fname) { | |
263 | pr_err("Cannot find suitable file in %s for %s\n", | |
264 | dir, dev); | |
265 | close(fd); | |
266 | return 1; | |
267 | } | |
268 | ||
269 | fl = open(fname, O_RDONLY); | |
270 | if (!fl) { | |
271 | pr_err("Could not open %s for --restore.\n", | |
272 | fname); | |
273 | goto err; | |
274 | } | |
275 | if (((unsigned long long)stb.st_size) != size) { | |
276 | pr_err("%s is not the same size as %s - cannot restore.\n", | |
277 | fname, dev); | |
278 | goto err; | |
279 | } | |
280 | if (st == NULL) | |
281 | st = guess_super_type(fl, guess_array); | |
282 | if (!st) { | |
283 | pr_err("Cannot find metadata on %s\n", fname); | |
284 | goto err; | |
285 | } | |
286 | st->ignore_hw_compat = 1; | |
287 | if (st->ss->load_super(st, fl, NULL) != 0) { | |
288 | pr_err("No %s metadata found on %s\n", | |
289 | st->ss->name, fname); | |
290 | goto err; | |
291 | } | |
292 | if (st->ss->copy_metadata == NULL) { | |
293 | pr_err("%s metadata on %s cannot be copied\n", | |
294 | st->ss->name, dev); | |
295 | goto err; | |
296 | } | |
297 | if (st->ss->copy_metadata(st, fl, fd) != 0) { | |
298 | pr_err("Failed to copy metadata from %s to %s\n", | |
299 | fname, dev); | |
300 | goto err; | |
301 | } | |
302 | if (c->verbose >= 0) | |
303 | printf("%s restored from %s.\n", dev, fname); | |
304 | return 0; | |
305 | ||
306 | err: | |
307 | close(fd); | |
308 | close(fl); | |
309 | free(fname); | |
310 | return 1; | |
311 | } |