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1 | /* |
2 | * CDDL HEADER START | |
3 | * | |
4 | * The contents of this file are subject to the terms of the | |
5 | * Common Development and Distribution License (the "License"). | |
6 | * You may not use this file except in compliance with the License. | |
7 | * | |
8 | * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE | |
9 | * or http://www.opensolaris.org/os/licensing. | |
10 | * See the License for the specific language governing permissions | |
11 | * and limitations under the License. | |
12 | * | |
13 | * When distributing Covered Code, include this CDDL HEADER in each | |
14 | * file and include the License file at usr/src/OPENSOLARIS.LICENSE. | |
15 | * If applicable, add the following below this CDDL HEADER, with the | |
16 | * fields enclosed by brackets "[]" replaced with your own identifying | |
17 | * information: Portions Copyright [yyyy] [name of copyright owner] | |
18 | * | |
19 | * CDDL HEADER END | |
20 | */ | |
21 | /* | |
22 | * Copyright 2007 Sun Microsystems, Inc. All rights reserved. | |
23 | * Use is subject to license terms. | |
24 | */ | |
25 | ||
26 | #pragma ident "@(#)translate.c 1.3 07/11/09 SMI" | |
27 | ||
28 | #include <libzfs.h> | |
29 | ||
30 | #undef verify /* both libzfs.h and zfs_context.h want to define this */ | |
31 | ||
32 | #include <sys/zfs_context.h> | |
33 | ||
34 | #include <errno.h> | |
35 | #include <fcntl.h> | |
36 | #include <stdarg.h> | |
37 | #include <stddef.h> | |
38 | #include <stdio.h> | |
39 | #include <stdlib.h> | |
40 | #include <strings.h> | |
41 | #include <sys/file.h> | |
42 | #include <sys/mntent.h> | |
43 | #include <sys/mnttab.h> | |
44 | #include <sys/param.h> | |
45 | #include <sys/stat.h> | |
46 | ||
47 | #include <sys/dmu.h> | |
48 | #include <sys/dmu_objset.h> | |
49 | #include <sys/dnode.h> | |
50 | ||
51 | #include <sys/mkdev.h> | |
52 | ||
53 | #include "zinject.h" | |
54 | ||
55 | extern void kernel_init(int); | |
56 | extern void kernel_fini(void); | |
57 | ||
58 | static int debug; | |
59 | ||
60 | static void | |
61 | ziprintf(const char *fmt, ...) | |
62 | { | |
63 | va_list ap; | |
64 | ||
65 | if (!debug) | |
66 | return; | |
67 | ||
68 | va_start(ap, fmt); | |
69 | (void) vprintf(fmt, ap); | |
70 | va_end(ap); | |
71 | } | |
72 | ||
73 | /* | |
74 | * Given a full path to a file, translate into a dataset name and a relative | |
75 | * path within the dataset. 'dataset' must be at least MAXNAMELEN characters, | |
76 | * and 'relpath' must be at least MAXPATHLEN characters. We also pass a stat64 | |
77 | * buffer, which we need later to get the object ID. | |
78 | */ | |
79 | static int | |
80 | parse_pathname(const char *fullpath, char *dataset, char *relpath, | |
81 | struct stat64 *statbuf) | |
82 | { | |
83 | struct extmnttab mp; | |
84 | FILE *fp; | |
85 | int match; | |
86 | const char *rel; | |
87 | ||
88 | if (fullpath[0] != '/') { | |
89 | (void) fprintf(stderr, "invalid object '%s': must be full " | |
90 | "path\n", fullpath); | |
91 | usage(); | |
92 | return (-1); | |
93 | } | |
94 | ||
95 | if (strlen(fullpath) >= MAXPATHLEN) { | |
96 | (void) fprintf(stderr, "invalid object; pathname too long\n"); | |
97 | return (-1); | |
98 | } | |
99 | ||
100 | if (stat64(fullpath, statbuf) != 0) { | |
101 | (void) fprintf(stderr, "cannot open '%s': %s\n", | |
102 | fullpath, strerror(errno)); | |
103 | return (-1); | |
104 | } | |
105 | ||
106 | if ((fp = fopen(MNTTAB, "r")) == NULL) { | |
107 | (void) fprintf(stderr, "cannot open /etc/mnttab\n"); | |
108 | return (-1); | |
109 | } | |
110 | ||
111 | match = 0; | |
112 | while (getextmntent(fp, &mp, sizeof (mp)) == 0) { | |
113 | if (makedev(mp.mnt_major, mp.mnt_minor) == statbuf->st_dev) { | |
114 | match = 1; | |
115 | break; | |
116 | } | |
117 | } | |
118 | ||
119 | if (!match) { | |
120 | (void) fprintf(stderr, "cannot find mountpoint for '%s'\n", | |
121 | fullpath); | |
122 | return (-1); | |
123 | } | |
124 | ||
125 | if (strcmp(mp.mnt_fstype, MNTTYPE_ZFS) != 0) { | |
126 | (void) fprintf(stderr, "invalid path '%s': not a ZFS " | |
127 | "filesystem\n", fullpath); | |
128 | return (-1); | |
129 | } | |
130 | ||
131 | if (strncmp(fullpath, mp.mnt_mountp, strlen(mp.mnt_mountp)) != 0) { | |
132 | (void) fprintf(stderr, "invalid path '%s': mountpoint " | |
133 | "doesn't match path\n", fullpath); | |
134 | return (-1); | |
135 | } | |
136 | ||
137 | (void) strcpy(dataset, mp.mnt_special); | |
138 | ||
139 | rel = fullpath + strlen(mp.mnt_mountp); | |
140 | if (rel[0] == '/') | |
141 | rel++; | |
142 | (void) strcpy(relpath, rel); | |
143 | ||
144 | return (0); | |
145 | } | |
146 | ||
147 | /* | |
148 | * Convert from a (dataset, path) pair into a (objset, object) pair. Note that | |
149 | * we grab the object number from the inode number, since looking this up via | |
150 | * libzpool is a real pain. | |
151 | */ | |
152 | /* ARGSUSED */ | |
153 | static int | |
154 | object_from_path(const char *dataset, const char *path, struct stat64 *statbuf, | |
155 | zinject_record_t *record) | |
156 | { | |
157 | objset_t *os; | |
158 | int err; | |
159 | ||
160 | /* | |
161 | * Before doing any libzpool operations, call sync() to ensure that the | |
162 | * on-disk state is consistent with the in-core state. | |
163 | */ | |
164 | sync(); | |
165 | ||
166 | if ((err = dmu_objset_open(dataset, DMU_OST_ZFS, | |
167 | DS_MODE_STANDARD | DS_MODE_READONLY, &os)) != 0) { | |
168 | (void) fprintf(stderr, "cannot open dataset '%s': %s\n", | |
169 | dataset, strerror(err)); | |
170 | return (-1); | |
171 | } | |
172 | ||
173 | record->zi_objset = dmu_objset_id(os); | |
174 | record->zi_object = statbuf->st_ino; | |
175 | ||
176 | dmu_objset_close(os); | |
177 | ||
178 | return (0); | |
179 | } | |
180 | ||
181 | /* | |
182 | * Calculate the real range based on the type, level, and range given. | |
183 | */ | |
184 | static int | |
185 | calculate_range(const char *dataset, err_type_t type, int level, char *range, | |
186 | zinject_record_t *record) | |
187 | { | |
188 | objset_t *os = NULL; | |
189 | dnode_t *dn = NULL; | |
190 | int err; | |
191 | int ret = -1; | |
192 | ||
193 | /* | |
194 | * Determine the numeric range from the string. | |
195 | */ | |
196 | if (range == NULL) { | |
197 | /* | |
198 | * If range is unspecified, set the range to [0,-1], which | |
199 | * indicates that the whole object should be treated as an | |
200 | * error. | |
201 | */ | |
202 | record->zi_start = 0; | |
203 | record->zi_end = -1ULL; | |
204 | } else { | |
205 | char *end; | |
206 | ||
207 | /* XXX add support for suffixes */ | |
208 | record->zi_start = strtoull(range, &end, 10); | |
209 | ||
210 | ||
211 | if (*end == '\0') | |
212 | record->zi_end = record->zi_start + 1; | |
213 | else if (*end == ',') | |
214 | record->zi_end = strtoull(end + 1, &end, 10); | |
215 | ||
216 | if (*end != '\0') { | |
217 | (void) fprintf(stderr, "invalid range '%s': must be " | |
218 | "a numeric range of the form 'start[,end]'\n", | |
219 | range); | |
220 | goto out; | |
221 | } | |
222 | } | |
223 | ||
224 | switch (type) { | |
225 | case TYPE_DATA: | |
226 | break; | |
227 | ||
228 | case TYPE_DNODE: | |
229 | /* | |
230 | * If this is a request to inject faults into the dnode, then we | |
231 | * must translate the current (objset,object) pair into an | |
232 | * offset within the metadnode for the objset. Specifying any | |
233 | * kind of range with type 'dnode' is illegal. | |
234 | */ | |
235 | if (range != NULL) { | |
236 | (void) fprintf(stderr, "range cannot be specified when " | |
237 | "type is 'dnode'\n"); | |
238 | goto out; | |
239 | } | |
240 | ||
241 | record->zi_start = record->zi_object * sizeof (dnode_phys_t); | |
242 | record->zi_end = record->zi_start + sizeof (dnode_phys_t); | |
243 | record->zi_object = 0; | |
244 | break; | |
245 | } | |
246 | ||
247 | /* | |
248 | * Get the dnode associated with object, so we can calculate the block | |
249 | * size. | |
250 | */ | |
251 | if ((err = dmu_objset_open(dataset, DMU_OST_ANY, | |
252 | DS_MODE_STANDARD | DS_MODE_READONLY, &os)) != 0) { | |
253 | (void) fprintf(stderr, "cannot open dataset '%s': %s\n", | |
254 | dataset, strerror(err)); | |
255 | goto out; | |
256 | } | |
257 | ||
258 | if (record->zi_object == 0) { | |
259 | dn = os->os->os_meta_dnode; | |
260 | } else { | |
261 | err = dnode_hold(os->os, record->zi_object, FTAG, &dn); | |
262 | if (err != 0) { | |
263 | (void) fprintf(stderr, "failed to hold dnode " | |
264 | "for object %llu\n", | |
265 | (u_longlong_t)record->zi_object); | |
266 | goto out; | |
267 | } | |
268 | } | |
269 | ||
270 | ||
271 | ziprintf("data shift: %d\n", (int)dn->dn_datablkshift); | |
272 | ziprintf(" ind shift: %d\n", (int)dn->dn_indblkshift); | |
273 | ||
274 | /* | |
275 | * Translate range into block IDs. | |
276 | */ | |
277 | if (record->zi_start != 0 || record->zi_end != -1ULL) { | |
278 | record->zi_start >>= dn->dn_datablkshift; | |
279 | record->zi_end >>= dn->dn_datablkshift; | |
280 | } | |
281 | ||
282 | /* | |
283 | * Check level, and then translate level 0 blkids into ranges | |
284 | * appropriate for level of indirection. | |
285 | */ | |
286 | record->zi_level = level; | |
287 | if (level > 0) { | |
288 | ziprintf("level 0 blkid range: [%llu, %llu]\n", | |
289 | record->zi_start, record->zi_end); | |
290 | ||
291 | if (level >= dn->dn_nlevels) { | |
292 | (void) fprintf(stderr, "level %d exceeds max level " | |
293 | "of object (%d)\n", level, dn->dn_nlevels - 1); | |
294 | goto out; | |
295 | } | |
296 | ||
297 | if (record->zi_start != 0 || record->zi_end != 0) { | |
298 | int shift = dn->dn_indblkshift - SPA_BLKPTRSHIFT; | |
299 | ||
300 | for (; level > 0; level--) { | |
301 | record->zi_start >>= shift; | |
302 | record->zi_end >>= shift; | |
303 | } | |
304 | } | |
305 | } | |
306 | ||
307 | ret = 0; | |
308 | out: | |
309 | if (dn) { | |
310 | if (dn != os->os->os_meta_dnode) | |
311 | dnode_rele(dn, FTAG); | |
312 | } | |
313 | if (os) | |
314 | dmu_objset_close(os); | |
315 | ||
316 | return (ret); | |
317 | } | |
318 | ||
319 | int | |
320 | translate_record(err_type_t type, const char *object, const char *range, | |
321 | int level, zinject_record_t *record, char *poolname, char *dataset) | |
322 | { | |
323 | char path[MAXPATHLEN]; | |
324 | char *slash; | |
325 | struct stat64 statbuf; | |
326 | int ret = -1; | |
327 | ||
328 | kernel_init(FREAD); | |
329 | ||
330 | debug = (getenv("ZINJECT_DEBUG") != NULL); | |
331 | ||
332 | ziprintf("translating: %s\n", object); | |
333 | ||
334 | if (MOS_TYPE(type)) { | |
335 | /* | |
336 | * MOS objects are treated specially. | |
337 | */ | |
338 | switch (type) { | |
339 | case TYPE_MOS: | |
340 | record->zi_type = 0; | |
341 | break; | |
342 | case TYPE_MOSDIR: | |
343 | record->zi_type = DMU_OT_OBJECT_DIRECTORY; | |
344 | break; | |
345 | case TYPE_METASLAB: | |
346 | record->zi_type = DMU_OT_OBJECT_ARRAY; | |
347 | break; | |
348 | case TYPE_CONFIG: | |
349 | record->zi_type = DMU_OT_PACKED_NVLIST; | |
350 | break; | |
351 | case TYPE_BPLIST: | |
352 | record->zi_type = DMU_OT_BPLIST; | |
353 | break; | |
354 | case TYPE_SPACEMAP: | |
355 | record->zi_type = DMU_OT_SPACE_MAP; | |
356 | break; | |
357 | case TYPE_ERRLOG: | |
358 | record->zi_type = DMU_OT_ERROR_LOG; | |
359 | break; | |
360 | } | |
361 | ||
362 | dataset[0] = '\0'; | |
363 | (void) strcpy(poolname, object); | |
364 | return (0); | |
365 | } | |
366 | ||
367 | /* | |
368 | * Convert a full path into a (dataset, file) pair. | |
369 | */ | |
370 | if (parse_pathname(object, dataset, path, &statbuf) != 0) | |
371 | goto err; | |
372 | ||
373 | ziprintf(" dataset: %s\n", dataset); | |
374 | ziprintf(" path: %s\n", path); | |
375 | ||
376 | /* | |
377 | * Convert (dataset, file) into (objset, object) | |
378 | */ | |
379 | if (object_from_path(dataset, path, &statbuf, record) != 0) | |
380 | goto err; | |
381 | ||
382 | ziprintf("raw objset: %llu\n", record->zi_objset); | |
383 | ziprintf("raw object: %llu\n", record->zi_object); | |
384 | ||
385 | /* | |
386 | * For the given object, calculate the real (type, level, range) | |
387 | */ | |
388 | if (calculate_range(dataset, type, level, (char *)range, record) != 0) | |
389 | goto err; | |
390 | ||
391 | ziprintf(" objset: %llu\n", record->zi_objset); | |
392 | ziprintf(" object: %llu\n", record->zi_object); | |
393 | if (record->zi_start == 0 && | |
394 | record->zi_end == -1ULL) | |
395 | ziprintf(" range: all\n"); | |
396 | else | |
397 | ziprintf(" range: [%llu, %llu]\n", record->zi_start, | |
398 | record->zi_end); | |
399 | ||
400 | /* | |
401 | * Copy the pool name | |
402 | */ | |
403 | (void) strcpy(poolname, dataset); | |
404 | if ((slash = strchr(poolname, '/')) != NULL) | |
405 | *slash = '\0'; | |
406 | ||
407 | ret = 0; | |
408 | ||
409 | err: | |
410 | kernel_fini(); | |
411 | return (ret); | |
412 | } | |
413 | ||
414 | int | |
415 | translate_raw(const char *str, zinject_record_t *record) | |
416 | { | |
417 | /* | |
418 | * A raw bookmark of the form objset:object:level:blkid, where each | |
419 | * number is a hexidecimal value. | |
420 | */ | |
421 | if (sscanf(str, "%llx:%llx:%x:%llx", (u_longlong_t *)&record->zi_objset, | |
422 | (u_longlong_t *)&record->zi_object, &record->zi_level, | |
423 | (u_longlong_t *)&record->zi_start) != 4) { | |
424 | (void) fprintf(stderr, "bad raw spec '%s': must be of the form " | |
425 | "'objset:object:level:blkid'\n", str); | |
426 | return (-1); | |
427 | } | |
428 | ||
429 | record->zi_end = record->zi_start; | |
430 | ||
431 | return (0); | |
432 | } | |
433 | ||
434 | int | |
435 | translate_device(const char *pool, const char *device, zinject_record_t *record) | |
436 | { | |
437 | char *end; | |
438 | zpool_handle_t *zhp; | |
439 | nvlist_t *tgt; | |
440 | boolean_t isspare, iscache; | |
441 | ||
442 | /* | |
443 | * Given a device name or GUID, create an appropriate injection record | |
444 | * with zi_guid set. | |
445 | */ | |
446 | if ((zhp = zpool_open(g_zfs, pool)) == NULL) | |
447 | return (-1); | |
448 | ||
449 | record->zi_guid = strtoull(device, &end, 16); | |
450 | if (record->zi_guid == 0 || *end != '\0') { | |
451 | tgt = zpool_find_vdev(zhp, device, &isspare, &iscache); | |
452 | ||
453 | if (tgt == NULL) { | |
454 | (void) fprintf(stderr, "cannot find device '%s' in " | |
455 | "pool '%s'\n", device, pool); | |
456 | return (-1); | |
457 | } | |
458 | ||
459 | verify(nvlist_lookup_uint64(tgt, ZPOOL_CONFIG_GUID, | |
460 | &record->zi_guid) == 0); | |
461 | } | |
462 | ||
463 | return (0); | |
464 | } |