author | marks |
Tue, 26 Jun 2007 07:44:24 -0700 | |
changeset 4543 | 12bb2876a62e |
parent 3655 | bf932d11a0cb |
child 4944 | 96d96f8de974 |
permissions | -rw-r--r-- |
2743 | 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 |
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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] |
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18 |
* |
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* CDDL HEADER END |
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20 |
*/ |
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21 |
/* |
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3547
e396e0a440b1
6512391 DMU should leverage ZIO dependencies to achieve greater parallelism
maybee
parents:
3093
diff
changeset
|
22 |
* Copyright 2007 Sun Microsystems, Inc. All rights reserved. |
2743 | 23 |
* Use is subject to license terms. |
24 |
*/ |
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25 |
||
26 |
#pragma ident "%Z%%M% %I% %E% SMI" |
|
27 |
||
28 |
#include <sys/dmu.h> |
|
29 |
#include <sys/dmu_impl.h> |
|
30 |
#include <sys/dmu_tx.h> |
|
31 |
#include <sys/dbuf.h> |
|
32 |
#include <sys/dnode.h> |
|
33 |
#include <sys/zfs_context.h> |
|
34 |
#include <sys/dmu_objset.h> |
|
35 |
#include <sys/dmu_traverse.h> |
|
36 |
#include <sys/dsl_dataset.h> |
|
37 |
#include <sys/dsl_dir.h> |
|
38 |
#include <sys/dsl_pool.h> |
|
39 |
#include <sys/dsl_synctask.h> |
|
40 |
#include <sys/zfs_ioctl.h> |
|
41 |
#include <sys/zap.h> |
|
42 |
#include <sys/zio_checksum.h> |
|
43 |
||
44 |
struct backuparg { |
|
45 |
dmu_replay_record_t *drr; |
|
46 |
vnode_t *vp; |
|
47 |
objset_t *os; |
|
48 |
zio_cksum_t zc; |
|
49 |
int err; |
|
50 |
}; |
|
51 |
||
52 |
static int |
|
53 |
dump_bytes(struct backuparg *ba, void *buf, int len) |
|
54 |
{ |
|
55 |
ssize_t resid; /* have to get resid to get detailed errno */ |
|
56 |
ASSERT3U(len % 8, ==, 0); |
|
57 |
||
58 |
fletcher_4_incremental_native(buf, len, &ba->zc); |
|
59 |
ba->err = vn_rdwr(UIO_WRITE, ba->vp, |
|
60 |
(caddr_t)buf, len, |
|
61 |
0, UIO_SYSSPACE, FAPPEND, RLIM64_INFINITY, CRED(), &resid); |
|
62 |
return (ba->err); |
|
63 |
} |
|
64 |
||
65 |
static int |
|
66 |
dump_free(struct backuparg *ba, uint64_t object, uint64_t offset, |
|
67 |
uint64_t length) |
|
68 |
{ |
|
69 |
/* write a FREE record */ |
|
70 |
bzero(ba->drr, sizeof (dmu_replay_record_t)); |
|
71 |
ba->drr->drr_type = DRR_FREE; |
|
72 |
ba->drr->drr_u.drr_free.drr_object = object; |
|
73 |
ba->drr->drr_u.drr_free.drr_offset = offset; |
|
74 |
ba->drr->drr_u.drr_free.drr_length = length; |
|
75 |
||
76 |
if (dump_bytes(ba, ba->drr, sizeof (dmu_replay_record_t))) |
|
77 |
return (EINTR); |
|
78 |
return (0); |
|
79 |
} |
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80 |
||
81 |
static int |
|
82 |
dump_data(struct backuparg *ba, dmu_object_type_t type, |
|
83 |
uint64_t object, uint64_t offset, int blksz, void *data) |
|
84 |
{ |
|
85 |
/* write a DATA record */ |
|
86 |
bzero(ba->drr, sizeof (dmu_replay_record_t)); |
|
87 |
ba->drr->drr_type = DRR_WRITE; |
|
88 |
ba->drr->drr_u.drr_write.drr_object = object; |
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89 |
ba->drr->drr_u.drr_write.drr_type = type; |
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90 |
ba->drr->drr_u.drr_write.drr_offset = offset; |
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91 |
ba->drr->drr_u.drr_write.drr_length = blksz; |
|
92 |
||
93 |
if (dump_bytes(ba, ba->drr, sizeof (dmu_replay_record_t))) |
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94 |
return (EINTR); |
|
95 |
if (dump_bytes(ba, data, blksz)) |
|
96 |
return (EINTR); |
|
97 |
return (0); |
|
98 |
} |
|
99 |
||
100 |
static int |
|
101 |
dump_freeobjects(struct backuparg *ba, uint64_t firstobj, uint64_t numobjs) |
|
102 |
{ |
|
103 |
/* write a FREEOBJECTS record */ |
|
104 |
bzero(ba->drr, sizeof (dmu_replay_record_t)); |
|
105 |
ba->drr->drr_type = DRR_FREEOBJECTS; |
|
106 |
ba->drr->drr_u.drr_freeobjects.drr_firstobj = firstobj; |
|
107 |
ba->drr->drr_u.drr_freeobjects.drr_numobjs = numobjs; |
|
108 |
||
109 |
if (dump_bytes(ba, ba->drr, sizeof (dmu_replay_record_t))) |
|
110 |
return (EINTR); |
|
111 |
return (0); |
|
112 |
} |
|
113 |
||
114 |
static int |
|
115 |
dump_dnode(struct backuparg *ba, uint64_t object, dnode_phys_t *dnp) |
|
116 |
{ |
|
117 |
if (dnp == NULL || dnp->dn_type == DMU_OT_NONE) |
|
118 |
return (dump_freeobjects(ba, object, 1)); |
|
119 |
||
120 |
/* write an OBJECT record */ |
|
121 |
bzero(ba->drr, sizeof (dmu_replay_record_t)); |
|
122 |
ba->drr->drr_type = DRR_OBJECT; |
|
123 |
ba->drr->drr_u.drr_object.drr_object = object; |
|
124 |
ba->drr->drr_u.drr_object.drr_type = dnp->dn_type; |
|
125 |
ba->drr->drr_u.drr_object.drr_bonustype = dnp->dn_bonustype; |
|
126 |
ba->drr->drr_u.drr_object.drr_blksz = |
|
127 |
dnp->dn_datablkszsec << SPA_MINBLOCKSHIFT; |
|
128 |
ba->drr->drr_u.drr_object.drr_bonuslen = dnp->dn_bonuslen; |
|
129 |
ba->drr->drr_u.drr_object.drr_checksum = dnp->dn_checksum; |
|
130 |
ba->drr->drr_u.drr_object.drr_compress = dnp->dn_compress; |
|
131 |
||
132 |
if (dump_bytes(ba, ba->drr, sizeof (dmu_replay_record_t))) |
|
133 |
return (EINTR); |
|
134 |
||
135 |
if (dump_bytes(ba, DN_BONUS(dnp), P2ROUNDUP(dnp->dn_bonuslen, 8))) |
|
136 |
return (EINTR); |
|
137 |
||
138 |
/* free anything past the end of the file */ |
|
139 |
if (dump_free(ba, object, (dnp->dn_maxblkid + 1) * |
|
140 |
(dnp->dn_datablkszsec << SPA_MINBLOCKSHIFT), -1ULL)) |
|
141 |
return (EINTR); |
|
142 |
if (ba->err) |
|
143 |
return (EINTR); |
|
144 |
return (0); |
|
145 |
} |
|
146 |
||
147 |
#define BP_SPAN(dnp, level) \ |
|
148 |
(((uint64_t)dnp->dn_datablkszsec) << (SPA_MINBLOCKSHIFT + \ |
|
149 |
(level) * (dnp->dn_indblkshift - SPA_BLKPTRSHIFT))) |
|
150 |
||
151 |
static int |
|
152 |
backup_cb(traverse_blk_cache_t *bc, spa_t *spa, void *arg) |
|
153 |
{ |
|
154 |
struct backuparg *ba = arg; |
|
155 |
uint64_t object = bc->bc_bookmark.zb_object; |
|
156 |
int level = bc->bc_bookmark.zb_level; |
|
157 |
uint64_t blkid = bc->bc_bookmark.zb_blkid; |
|
158 |
blkptr_t *bp = bc->bc_blkptr.blk_birth ? &bc->bc_blkptr : NULL; |
|
159 |
dmu_object_type_t type = bp ? BP_GET_TYPE(bp) : DMU_OT_NONE; |
|
160 |
void *data = bc->bc_data; |
|
161 |
int err = 0; |
|
162 |
||
163 |
if (issig(JUSTLOOKING) && issig(FORREAL)) |
|
164 |
return (EINTR); |
|
165 |
||
166 |
ASSERT(data || bp == NULL); |
|
167 |
||
168 |
if (bp == NULL && object == 0) { |
|
169 |
uint64_t span = BP_SPAN(bc->bc_dnode, level); |
|
170 |
uint64_t dnobj = (blkid * span) >> DNODE_SHIFT; |
|
171 |
err = dump_freeobjects(ba, dnobj, span >> DNODE_SHIFT); |
|
172 |
} else if (bp == NULL) { |
|
173 |
uint64_t span = BP_SPAN(bc->bc_dnode, level); |
|
174 |
err = dump_free(ba, object, blkid * span, span); |
|
175 |
} else if (data && level == 0 && type == DMU_OT_DNODE) { |
|
176 |
dnode_phys_t *blk = data; |
|
177 |
int i; |
|
178 |
int blksz = BP_GET_LSIZE(bp); |
|
179 |
||
180 |
for (i = 0; i < blksz >> DNODE_SHIFT; i++) { |
|
181 |
uint64_t dnobj = |
|
182 |
(blkid << (DNODE_BLOCK_SHIFT - DNODE_SHIFT)) + i; |
|
183 |
err = dump_dnode(ba, dnobj, blk+i); |
|
184 |
if (err) |
|
185 |
break; |
|
186 |
} |
|
187 |
} else if (level == 0 && |
|
188 |
type != DMU_OT_DNODE && type != DMU_OT_OBJSET) { |
|
189 |
int blksz = BP_GET_LSIZE(bp); |
|
190 |
if (data == NULL) { |
|
191 |
uint32_t aflags = ARC_WAIT; |
|
192 |
arc_buf_t *abuf; |
|
193 |
zbookmark_t zb; |
|
194 |
||
195 |
zb.zb_objset = ba->os->os->os_dsl_dataset->ds_object; |
|
196 |
zb.zb_object = object; |
|
197 |
zb.zb_level = level; |
|
198 |
zb.zb_blkid = blkid; |
|
199 |
(void) arc_read(NULL, spa, bp, |
|
200 |
dmu_ot[type].ot_byteswap, arc_getbuf_func, &abuf, |
|
201 |
ZIO_PRIORITY_ASYNC_READ, ZIO_FLAG_MUSTSUCCEED, |
|
202 |
&aflags, &zb); |
|
203 |
||
204 |
if (abuf) { |
|
205 |
err = dump_data(ba, type, object, blkid * blksz, |
|
206 |
blksz, abuf->b_data); |
|
207 |
(void) arc_buf_remove_ref(abuf, &abuf); |
|
208 |
} |
|
209 |
} else { |
|
210 |
err = dump_data(ba, type, object, blkid * blksz, |
|
211 |
blksz, data); |
|
212 |
} |
|
213 |
} |
|
214 |
||
215 |
ASSERT(err == 0 || err == EINTR); |
|
216 |
return (err); |
|
217 |
} |
|
218 |
||
219 |
int |
|
220 |
dmu_sendbackup(objset_t *tosnap, objset_t *fromsnap, vnode_t *vp) |
|
221 |
{ |
|
222 |
dsl_dataset_t *ds = tosnap->os->os_dsl_dataset; |
|
223 |
dsl_dataset_t *fromds = fromsnap ? fromsnap->os->os_dsl_dataset : NULL; |
|
224 |
dmu_replay_record_t *drr; |
|
225 |
struct backuparg ba; |
|
226 |
int err; |
|
227 |
||
228 |
/* tosnap must be a snapshot */ |
|
229 |
if (ds->ds_phys->ds_next_snap_obj == 0) |
|
230 |
return (EINVAL); |
|
231 |
||
232 |
/* fromsnap must be an earlier snapshot from the same fs as tosnap */ |
|
233 |
if (fromds && (ds->ds_dir != fromds->ds_dir || |
|
234 |
fromds->ds_phys->ds_creation_txg >= |
|
235 |
ds->ds_phys->ds_creation_txg)) |
|
236 |
return (EXDEV); |
|
237 |
||
238 |
drr = kmem_zalloc(sizeof (dmu_replay_record_t), KM_SLEEP); |
|
239 |
drr->drr_type = DRR_BEGIN; |
|
240 |
drr->drr_u.drr_begin.drr_magic = DMU_BACKUP_MAGIC; |
|
241 |
drr->drr_u.drr_begin.drr_version = DMU_BACKUP_VERSION; |
|
242 |
drr->drr_u.drr_begin.drr_creation_time = |
|
243 |
ds->ds_phys->ds_creation_time; |
|
244 |
drr->drr_u.drr_begin.drr_type = tosnap->os->os_phys->os_type; |
|
245 |
drr->drr_u.drr_begin.drr_toguid = ds->ds_phys->ds_guid; |
|
246 |
if (fromds) |
|
247 |
drr->drr_u.drr_begin.drr_fromguid = fromds->ds_phys->ds_guid; |
|
248 |
dsl_dataset_name(ds, drr->drr_u.drr_begin.drr_toname); |
|
249 |
||
250 |
ba.drr = drr; |
|
251 |
ba.vp = vp; |
|
252 |
ba.os = tosnap; |
|
253 |
ZIO_SET_CHECKSUM(&ba.zc, 0, 0, 0, 0); |
|
254 |
||
255 |
if (dump_bytes(&ba, drr, sizeof (dmu_replay_record_t))) { |
|
256 |
kmem_free(drr, sizeof (dmu_replay_record_t)); |
|
257 |
return (ba.err); |
|
258 |
} |
|
259 |
||
260 |
err = traverse_dsl_dataset(ds, |
|
261 |
fromds ? fromds->ds_phys->ds_creation_txg : 0, |
|
262 |
ADVANCE_PRE | ADVANCE_HOLES | ADVANCE_DATA | ADVANCE_NOLOCK, |
|
263 |
backup_cb, &ba); |
|
264 |
||
265 |
if (err) { |
|
266 |
if (err == EINTR && ba.err) |
|
267 |
err = ba.err; |
|
3655 | 268 |
kmem_free(drr, sizeof (dmu_replay_record_t)); |
2743 | 269 |
return (err); |
270 |
} |
|
271 |
||
272 |
bzero(drr, sizeof (dmu_replay_record_t)); |
|
273 |
drr->drr_type = DRR_END; |
|
274 |
drr->drr_u.drr_end.drr_checksum = ba.zc; |
|
275 |
||
3655 | 276 |
if (dump_bytes(&ba, drr, sizeof (dmu_replay_record_t))) { |
277 |
kmem_free(drr, sizeof (dmu_replay_record_t)); |
|
2743 | 278 |
return (ba.err); |
3655 | 279 |
} |
2743 | 280 |
|
281 |
kmem_free(drr, sizeof (dmu_replay_record_t)); |
|
282 |
||
283 |
return (0); |
|
284 |
} |
|
285 |
||
286 |
struct restorearg { |
|
287 |
int err; |
|
288 |
int byteswap; |
|
289 |
vnode_t *vp; |
|
290 |
char *buf; |
|
291 |
uint64_t voff; |
|
292 |
int buflen; /* number of valid bytes in buf */ |
|
293 |
int bufoff; /* next offset to read */ |
|
294 |
int bufsize; /* amount of memory allocated for buf */ |
|
295 |
zio_cksum_t zc; |
|
296 |
}; |
|
297 |
||
298 |
/* ARGSUSED */ |
|
299 |
static int |
|
300 |
replay_incremental_check(void *arg1, void *arg2, dmu_tx_t *tx) |
|
301 |
{ |
|
302 |
dsl_dataset_t *ds = arg1; |
|
303 |
struct drr_begin *drrb = arg2; |
|
304 |
const char *snapname; |
|
305 |
int err; |
|
306 |
uint64_t val; |
|
307 |
||
308 |
/* must already be a snapshot of this fs */ |
|
309 |
if (ds->ds_phys->ds_prev_snap_obj == 0) |
|
310 |
return (ENODEV); |
|
311 |
||
312 |
/* most recent snapshot must match fromguid */ |
|
313 |
if (ds->ds_prev->ds_phys->ds_guid != drrb->drr_fromguid) |
|
314 |
return (ENODEV); |
|
315 |
/* must not have any changes since most recent snapshot */ |
|
316 |
if (ds->ds_phys->ds_bp.blk_birth > |
|
317 |
ds->ds_prev->ds_phys->ds_creation_txg) |
|
318 |
return (ETXTBSY); |
|
319 |
||
320 |
/* new snapshot name must not exist */ |
|
321 |
snapname = strrchr(drrb->drr_toname, '@'); |
|
322 |
if (snapname == NULL) |
|
323 |
return (EEXIST); |
|
324 |
||
325 |
snapname++; |
|
326 |
err = zap_lookup(ds->ds_dir->dd_pool->dp_meta_objset, |
|
327 |
ds->ds_phys->ds_snapnames_zapobj, snapname, 8, 1, &val); |
|
328 |
if (err == 0) |
|
329 |
return (EEXIST); |
|
330 |
if (err != ENOENT) |
|
331 |
return (err); |
|
332 |
||
333 |
return (0); |
|
334 |
} |
|
335 |
||
336 |
/* ARGSUSED */ |
|
337 |
static void |
|
4543 | 338 |
replay_incremental_sync(void *arg1, void *arg2, cred_t *cr, dmu_tx_t *tx) |
2743 | 339 |
{ |
340 |
dsl_dataset_t *ds = arg1; |
|
341 |
dmu_buf_will_dirty(ds->ds_dbuf, tx); |
|
342 |
ds->ds_phys->ds_flags |= DS_FLAG_INCONSISTENT; |
|
4543 | 343 |
|
344 |
spa_history_internal_log(LOG_DS_REPLAY_INC_SYNC, |
|
345 |
ds->ds_dir->dd_pool->dp_spa, tx, cr, "dataset = %lld", |
|
346 |
ds->ds_phys->ds_dir_obj); |
|
2743 | 347 |
} |
348 |
||
349 |
/* ARGSUSED */ |
|
350 |
static int |
|
351 |
replay_full_check(void *arg1, void *arg2, dmu_tx_t *tx) |
|
352 |
{ |
|
353 |
dsl_dir_t *dd = arg1; |
|
354 |
struct drr_begin *drrb = arg2; |
|
355 |
objset_t *mos = dd->dd_pool->dp_meta_objset; |
|
356 |
char *cp; |
|
357 |
uint64_t val; |
|
358 |
int err; |
|
359 |
||
360 |
cp = strchr(drrb->drr_toname, '@'); |
|
361 |
*cp = '\0'; |
|
362 |
err = zap_lookup(mos, dd->dd_phys->dd_child_dir_zapobj, |
|
363 |
strrchr(drrb->drr_toname, '/') + 1, |
|
364 |
sizeof (uint64_t), 1, &val); |
|
365 |
*cp = '@'; |
|
366 |
||
367 |
if (err != ENOENT) |
|
368 |
return (err ? err : EEXIST); |
|
369 |
||
370 |
return (0); |
|
371 |
} |
|
372 |
||
373 |
static void |
|
4543 | 374 |
replay_full_sync(void *arg1, void *arg2, cred_t *cr, dmu_tx_t *tx) |
2743 | 375 |
{ |
376 |
dsl_dir_t *dd = arg1; |
|
377 |
struct drr_begin *drrb = arg2; |
|
378 |
char *cp; |
|
379 |
dsl_dataset_t *ds; |
|
380 |
uint64_t dsobj; |
|
381 |
||
382 |
cp = strchr(drrb->drr_toname, '@'); |
|
383 |
*cp = '\0'; |
|
384 |
dsobj = dsl_dataset_create_sync(dd, strrchr(drrb->drr_toname, '/') + 1, |
|
385 |
NULL, tx); |
|
386 |
||
387 |
VERIFY(0 == dsl_dataset_open_obj(dd->dd_pool, dsobj, NULL, |
|
388 |
DS_MODE_EXCLUSIVE, FTAG, &ds)); |
|
389 |
||
390 |
(void) dmu_objset_create_impl(dsl_dataset_get_spa(ds), |
|
3547
e396e0a440b1
6512391 DMU should leverage ZIO dependencies to achieve greater parallelism
maybee
parents:
3093
diff
changeset
|
391 |
ds, &ds->ds_phys->ds_bp, drrb->drr_type, tx); |
2743 | 392 |
|
393 |
dmu_buf_will_dirty(ds->ds_dbuf, tx); |
|
394 |
ds->ds_phys->ds_flags |= DS_FLAG_INCONSISTENT; |
|
395 |
||
4543 | 396 |
spa_history_internal_log(LOG_DS_REPLAY_FULL_SYNC, |
397 |
ds->ds_dir->dd_pool->dp_spa, tx, cr, "dataset = %lld", |
|
398 |
ds->ds_phys->ds_dir_obj); |
|
399 |
||
400 |
*cp = '@'; |
|
401 |
||
2743 | 402 |
dsl_dataset_close(ds, DS_MODE_EXCLUSIVE, FTAG); |
403 |
} |
|
404 |
||
405 |
static int |
|
406 |
replay_end_check(void *arg1, void *arg2, dmu_tx_t *tx) |
|
407 |
{ |
|
408 |
objset_t *os = arg1; |
|
409 |
struct drr_begin *drrb = arg2; |
|
410 |
char *snapname; |
|
411 |
||
412 |
/* XXX verify that drr_toname is in dd */ |
|
413 |
||
414 |
snapname = strchr(drrb->drr_toname, '@'); |
|
415 |
if (snapname == NULL) |
|
416 |
return (EINVAL); |
|
417 |
snapname++; |
|
418 |
||
419 |
return (dsl_dataset_snapshot_check(os, snapname, tx)); |
|
420 |
} |
|
421 |
||
422 |
static void |
|
4543 | 423 |
replay_end_sync(void *arg1, void *arg2, cred_t *cr, dmu_tx_t *tx) |
2743 | 424 |
{ |
425 |
objset_t *os = arg1; |
|
426 |
struct drr_begin *drrb = arg2; |
|
427 |
char *snapname; |
|
428 |
dsl_dataset_t *ds, *hds; |
|
429 |
||
430 |
snapname = strchr(drrb->drr_toname, '@') + 1; |
|
431 |
||
4543 | 432 |
dsl_dataset_snapshot_sync(os, snapname, cr, tx); |
2743 | 433 |
|
434 |
/* set snapshot's creation time and guid */ |
|
435 |
hds = os->os->os_dsl_dataset; |
|
436 |
VERIFY(0 == dsl_dataset_open_obj(hds->ds_dir->dd_pool, |
|
437 |
hds->ds_phys->ds_prev_snap_obj, NULL, |
|
438 |
DS_MODE_PRIMARY | DS_MODE_READONLY | DS_MODE_INCONSISTENT, |
|
439 |
FTAG, &ds)); |
|
440 |
||
441 |
dmu_buf_will_dirty(ds->ds_dbuf, tx); |
|
442 |
ds->ds_phys->ds_creation_time = drrb->drr_creation_time; |
|
443 |
ds->ds_phys->ds_guid = drrb->drr_toguid; |
|
444 |
ds->ds_phys->ds_flags &= ~DS_FLAG_INCONSISTENT; |
|
445 |
||
4543 | 446 |
/* log the end of the receive */ |
447 |
spa_history_internal_log(LOG_DS_RECEIVE, ds->ds_dir->dd_pool->dp_spa, |
|
448 |
tx, cr, "dataset = %llu", ds->ds_phys->ds_dir_obj); |
|
449 |
||
2743 | 450 |
dsl_dataset_close(ds, DS_MODE_PRIMARY, FTAG); |
451 |
||
452 |
dmu_buf_will_dirty(hds->ds_dbuf, tx); |
|
453 |
hds->ds_phys->ds_flags &= ~DS_FLAG_INCONSISTENT; |
|
454 |
} |
|
455 |
||
456 |
static void * |
|
457 |
restore_read(struct restorearg *ra, int len) |
|
458 |
{ |
|
459 |
void *rv; |
|
460 |
||
461 |
/* some things will require 8-byte alignment, so everything must */ |
|
462 |
ASSERT3U(len % 8, ==, 0); |
|
463 |
||
464 |
while (ra->buflen - ra->bufoff < len) { |
|
465 |
ssize_t resid; |
|
466 |
int leftover = ra->buflen - ra->bufoff; |
|
467 |
||
468 |
(void) memmove(ra->buf, ra->buf + ra->bufoff, leftover); |
|
469 |
ra->err = vn_rdwr(UIO_READ, ra->vp, |
|
470 |
(caddr_t)ra->buf + leftover, ra->bufsize - leftover, |
|
471 |
ra->voff, UIO_SYSSPACE, FAPPEND, |
|
472 |
RLIM64_INFINITY, CRED(), &resid); |
|
473 |
||
474 |
ra->voff += ra->bufsize - leftover - resid; |
|
475 |
ra->buflen = ra->bufsize - resid; |
|
476 |
ra->bufoff = 0; |
|
477 |
if (resid == ra->bufsize - leftover) |
|
478 |
ra->err = EINVAL; |
|
479 |
if (ra->err) |
|
480 |
return (NULL); |
|
481 |
/* Could compute checksum here? */ |
|
482 |
} |
|
483 |
||
484 |
ASSERT3U(ra->bufoff % 8, ==, 0); |
|
485 |
ASSERT3U(ra->buflen - ra->bufoff, >=, len); |
|
486 |
rv = ra->buf + ra->bufoff; |
|
487 |
ra->bufoff += len; |
|
488 |
if (ra->byteswap) |
|
489 |
fletcher_4_incremental_byteswap(rv, len, &ra->zc); |
|
490 |
else |
|
491 |
fletcher_4_incremental_native(rv, len, &ra->zc); |
|
492 |
return (rv); |
|
493 |
} |
|
494 |
||
495 |
static void |
|
496 |
backup_byteswap(dmu_replay_record_t *drr) |
|
497 |
{ |
|
498 |
#define DO64(X) (drr->drr_u.X = BSWAP_64(drr->drr_u.X)) |
|
499 |
#define DO32(X) (drr->drr_u.X = BSWAP_32(drr->drr_u.X)) |
|
500 |
drr->drr_type = BSWAP_32(drr->drr_type); |
|
501 |
switch (drr->drr_type) { |
|
502 |
case DRR_BEGIN: |
|
503 |
DO64(drr_begin.drr_magic); |
|
504 |
DO64(drr_begin.drr_version); |
|
505 |
DO64(drr_begin.drr_creation_time); |
|
506 |
DO32(drr_begin.drr_type); |
|
507 |
DO64(drr_begin.drr_toguid); |
|
508 |
DO64(drr_begin.drr_fromguid); |
|
509 |
break; |
|
510 |
case DRR_OBJECT: |
|
511 |
DO64(drr_object.drr_object); |
|
512 |
/* DO64(drr_object.drr_allocation_txg); */ |
|
513 |
DO32(drr_object.drr_type); |
|
514 |
DO32(drr_object.drr_bonustype); |
|
515 |
DO32(drr_object.drr_blksz); |
|
516 |
DO32(drr_object.drr_bonuslen); |
|
517 |
break; |
|
518 |
case DRR_FREEOBJECTS: |
|
519 |
DO64(drr_freeobjects.drr_firstobj); |
|
520 |
DO64(drr_freeobjects.drr_numobjs); |
|
521 |
break; |
|
522 |
case DRR_WRITE: |
|
523 |
DO64(drr_write.drr_object); |
|
524 |
DO32(drr_write.drr_type); |
|
525 |
DO64(drr_write.drr_offset); |
|
526 |
DO64(drr_write.drr_length); |
|
527 |
break; |
|
528 |
case DRR_FREE: |
|
529 |
DO64(drr_free.drr_object); |
|
530 |
DO64(drr_free.drr_offset); |
|
531 |
DO64(drr_free.drr_length); |
|
532 |
break; |
|
533 |
case DRR_END: |
|
534 |
DO64(drr_end.drr_checksum.zc_word[0]); |
|
535 |
DO64(drr_end.drr_checksum.zc_word[1]); |
|
536 |
DO64(drr_end.drr_checksum.zc_word[2]); |
|
537 |
DO64(drr_end.drr_checksum.zc_word[3]); |
|
538 |
break; |
|
539 |
} |
|
540 |
#undef DO64 |
|
541 |
#undef DO32 |
|
542 |
} |
|
543 |
||
544 |
static int |
|
545 |
restore_object(struct restorearg *ra, objset_t *os, struct drr_object *drro) |
|
546 |
{ |
|
547 |
int err; |
|
548 |
dmu_tx_t *tx; |
|
549 |
||
550 |
err = dmu_object_info(os, drro->drr_object, NULL); |
|
551 |
||
552 |
if (err != 0 && err != ENOENT) |
|
553 |
return (EINVAL); |
|
554 |
||
555 |
if (drro->drr_type == DMU_OT_NONE || |
|
556 |
drro->drr_type >= DMU_OT_NUMTYPES || |
|
557 |
drro->drr_bonustype >= DMU_OT_NUMTYPES || |
|
558 |
drro->drr_checksum >= ZIO_CHECKSUM_FUNCTIONS || |
|
559 |
drro->drr_compress >= ZIO_COMPRESS_FUNCTIONS || |
|
560 |
P2PHASE(drro->drr_blksz, SPA_MINBLOCKSIZE) || |
|
561 |
drro->drr_blksz < SPA_MINBLOCKSIZE || |
|
562 |
drro->drr_blksz > SPA_MAXBLOCKSIZE || |
|
563 |
drro->drr_bonuslen > DN_MAX_BONUSLEN) { |
|
564 |
return (EINVAL); |
|
565 |
} |
|
566 |
||
567 |
tx = dmu_tx_create(os); |
|
568 |
||
569 |
if (err == ENOENT) { |
|
570 |
/* currently free, want to be allocated */ |
|
571 |
dmu_tx_hold_bonus(tx, DMU_NEW_OBJECT); |
|
572 |
dmu_tx_hold_write(tx, DMU_NEW_OBJECT, 0, 1); |
|
573 |
err = dmu_tx_assign(tx, TXG_WAIT); |
|
574 |
if (err) { |
|
575 |
dmu_tx_abort(tx); |
|
576 |
return (err); |
|
577 |
} |
|
578 |
err = dmu_object_claim(os, drro->drr_object, |
|
579 |
drro->drr_type, drro->drr_blksz, |
|
580 |
drro->drr_bonustype, drro->drr_bonuslen, tx); |
|
581 |
} else { |
|
582 |
/* currently allocated, want to be allocated */ |
|
583 |
dmu_tx_hold_bonus(tx, drro->drr_object); |
|
584 |
/* |
|
585 |
* We may change blocksize, so need to |
|
586 |
* hold_write |
|
587 |
*/ |
|
588 |
dmu_tx_hold_write(tx, drro->drr_object, 0, 1); |
|
589 |
err = dmu_tx_assign(tx, TXG_WAIT); |
|
590 |
if (err) { |
|
591 |
dmu_tx_abort(tx); |
|
592 |
return (err); |
|
593 |
} |
|
594 |
||
595 |
err = dmu_object_reclaim(os, drro->drr_object, |
|
596 |
drro->drr_type, drro->drr_blksz, |
|
597 |
drro->drr_bonustype, drro->drr_bonuslen, tx); |
|
598 |
} |
|
599 |
if (err) { |
|
600 |
dmu_tx_commit(tx); |
|
601 |
return (EINVAL); |
|
602 |
} |
|
603 |
||
604 |
dmu_object_set_checksum(os, drro->drr_object, drro->drr_checksum, tx); |
|
605 |
dmu_object_set_compress(os, drro->drr_object, drro->drr_compress, tx); |
|
606 |
||
607 |
if (drro->drr_bonuslen) { |
|
608 |
dmu_buf_t *db; |
|
609 |
void *data; |
|
610 |
VERIFY(0 == dmu_bonus_hold(os, drro->drr_object, FTAG, &db)); |
|
611 |
dmu_buf_will_dirty(db, tx); |
|
612 |
||
613 |
ASSERT3U(db->db_size, ==, drro->drr_bonuslen); |
|
614 |
data = restore_read(ra, P2ROUNDUP(db->db_size, 8)); |
|
615 |
if (data == NULL) { |
|
616 |
dmu_tx_commit(tx); |
|
617 |
return (ra->err); |
|
618 |
} |
|
619 |
bcopy(data, db->db_data, db->db_size); |
|
620 |
if (ra->byteswap) { |
|
621 |
dmu_ot[drro->drr_bonustype].ot_byteswap(db->db_data, |
|
622 |
drro->drr_bonuslen); |
|
623 |
} |
|
624 |
dmu_buf_rele(db, FTAG); |
|
625 |
} |
|
626 |
dmu_tx_commit(tx); |
|
627 |
return (0); |
|
628 |
} |
|
629 |
||
630 |
/* ARGSUSED */ |
|
631 |
static int |
|
632 |
restore_freeobjects(struct restorearg *ra, objset_t *os, |
|
633 |
struct drr_freeobjects *drrfo) |
|
634 |
{ |
|
635 |
uint64_t obj; |
|
636 |
||
637 |
if (drrfo->drr_firstobj + drrfo->drr_numobjs < drrfo->drr_firstobj) |
|
638 |
return (EINVAL); |
|
639 |
||
640 |
for (obj = drrfo->drr_firstobj; |
|
3087 | 641 |
obj < drrfo->drr_firstobj + drrfo->drr_numobjs; |
642 |
(void) dmu_object_next(os, &obj, FALSE, 0)) { |
|
2743 | 643 |
dmu_tx_t *tx; |
644 |
int err; |
|
645 |
||
646 |
if (dmu_object_info(os, obj, NULL) != 0) |
|
647 |
continue; |
|
648 |
||
649 |
tx = dmu_tx_create(os); |
|
650 |
dmu_tx_hold_bonus(tx, obj); |
|
651 |
err = dmu_tx_assign(tx, TXG_WAIT); |
|
652 |
if (err) { |
|
653 |
dmu_tx_abort(tx); |
|
654 |
return (err); |
|
655 |
} |
|
656 |
err = dmu_object_free(os, obj, tx); |
|
657 |
dmu_tx_commit(tx); |
|
658 |
if (err && err != ENOENT) |
|
659 |
return (EINVAL); |
|
660 |
} |
|
661 |
return (0); |
|
662 |
} |
|
663 |
||
664 |
static int |
|
665 |
restore_write(struct restorearg *ra, objset_t *os, |
|
666 |
struct drr_write *drrw) |
|
667 |
{ |
|
668 |
dmu_tx_t *tx; |
|
669 |
void *data; |
|
670 |
int err; |
|
671 |
||
672 |
if (drrw->drr_offset + drrw->drr_length < drrw->drr_offset || |
|
673 |
drrw->drr_type >= DMU_OT_NUMTYPES) |
|
674 |
return (EINVAL); |
|
675 |
||
676 |
data = restore_read(ra, drrw->drr_length); |
|
677 |
if (data == NULL) |
|
678 |
return (ra->err); |
|
679 |
||
680 |
if (dmu_object_info(os, drrw->drr_object, NULL) != 0) |
|
681 |
return (EINVAL); |
|
682 |
||
683 |
tx = dmu_tx_create(os); |
|
684 |
||
685 |
dmu_tx_hold_write(tx, drrw->drr_object, |
|
686 |
drrw->drr_offset, drrw->drr_length); |
|
687 |
err = dmu_tx_assign(tx, TXG_WAIT); |
|
688 |
if (err) { |
|
689 |
dmu_tx_abort(tx); |
|
690 |
return (err); |
|
691 |
} |
|
692 |
if (ra->byteswap) |
|
693 |
dmu_ot[drrw->drr_type].ot_byteswap(data, drrw->drr_length); |
|
694 |
dmu_write(os, drrw->drr_object, |
|
695 |
drrw->drr_offset, drrw->drr_length, data, tx); |
|
696 |
dmu_tx_commit(tx); |
|
697 |
return (0); |
|
698 |
} |
|
699 |
||
700 |
/* ARGSUSED */ |
|
701 |
static int |
|
702 |
restore_free(struct restorearg *ra, objset_t *os, |
|
703 |
struct drr_free *drrf) |
|
704 |
{ |
|
705 |
dmu_tx_t *tx; |
|
706 |
int err; |
|
707 |
||
708 |
if (drrf->drr_length != -1ULL && |
|
709 |
drrf->drr_offset + drrf->drr_length < drrf->drr_offset) |
|
710 |
return (EINVAL); |
|
711 |
||
712 |
if (dmu_object_info(os, drrf->drr_object, NULL) != 0) |
|
713 |
return (EINVAL); |
|
714 |
||
715 |
tx = dmu_tx_create(os); |
|
716 |
||
717 |
dmu_tx_hold_free(tx, drrf->drr_object, |
|
718 |
drrf->drr_offset, drrf->drr_length); |
|
719 |
err = dmu_tx_assign(tx, TXG_WAIT); |
|
720 |
if (err) { |
|
721 |
dmu_tx_abort(tx); |
|
722 |
return (err); |
|
723 |
} |
|
724 |
err = dmu_free_range(os, drrf->drr_object, |
|
725 |
drrf->drr_offset, drrf->drr_length, tx); |
|
726 |
dmu_tx_commit(tx); |
|
727 |
return (err); |
|
728 |
} |
|
729 |
||
730 |
int |
|
731 |
dmu_recvbackup(char *tosnap, struct drr_begin *drrb, uint64_t *sizep, |
|
732 |
boolean_t force, vnode_t *vp, uint64_t voffset) |
|
733 |
{ |
|
734 |
struct restorearg ra; |
|
735 |
dmu_replay_record_t *drr; |
|
736 |
char *cp; |
|
737 |
objset_t *os = NULL; |
|
738 |
zio_cksum_t pzc; |
|
739 |
||
740 |
bzero(&ra, sizeof (ra)); |
|
741 |
ra.vp = vp; |
|
742 |
ra.voff = voffset; |
|
743 |
ra.bufsize = 1<<20; |
|
744 |
ra.buf = kmem_alloc(ra.bufsize, KM_SLEEP); |
|
745 |
||
746 |
if (drrb->drr_magic == DMU_BACKUP_MAGIC) { |
|
747 |
ra.byteswap = FALSE; |
|
748 |
} else if (drrb->drr_magic == BSWAP_64(DMU_BACKUP_MAGIC)) { |
|
749 |
ra.byteswap = TRUE; |
|
750 |
} else { |
|
751 |
ra.err = EINVAL; |
|
752 |
goto out; |
|
753 |
} |
|
754 |
||
755 |
/* |
|
756 |
* NB: this assumes that struct drr_begin will be the largest in |
|
757 |
* dmu_replay_record_t's drr_u, and thus we don't need to pad it |
|
758 |
* with zeros to make it the same length as we wrote out. |
|
759 |
*/ |
|
760 |
((dmu_replay_record_t *)ra.buf)->drr_type = DRR_BEGIN; |
|
761 |
((dmu_replay_record_t *)ra.buf)->drr_pad = 0; |
|
762 |
((dmu_replay_record_t *)ra.buf)->drr_u.drr_begin = *drrb; |
|
763 |
if (ra.byteswap) { |
|
764 |
fletcher_4_incremental_byteswap(ra.buf, |
|
765 |
sizeof (dmu_replay_record_t), &ra.zc); |
|
766 |
} else { |
|
767 |
fletcher_4_incremental_native(ra.buf, |
|
768 |
sizeof (dmu_replay_record_t), &ra.zc); |
|
769 |
} |
|
770 |
(void) strcpy(drrb->drr_toname, tosnap); /* for the sync funcs */ |
|
771 |
||
772 |
if (ra.byteswap) { |
|
773 |
drrb->drr_magic = BSWAP_64(drrb->drr_magic); |
|
774 |
drrb->drr_version = BSWAP_64(drrb->drr_version); |
|
775 |
drrb->drr_creation_time = BSWAP_64(drrb->drr_creation_time); |
|
776 |
drrb->drr_type = BSWAP_32(drrb->drr_type); |
|
777 |
drrb->drr_toguid = BSWAP_64(drrb->drr_toguid); |
|
778 |
drrb->drr_fromguid = BSWAP_64(drrb->drr_fromguid); |
|
779 |
} |
|
780 |
||
781 |
ASSERT3U(drrb->drr_magic, ==, DMU_BACKUP_MAGIC); |
|
782 |
||
783 |
if (drrb->drr_version != DMU_BACKUP_VERSION || |
|
784 |
drrb->drr_type >= DMU_OST_NUMTYPES || |
|
785 |
strchr(drrb->drr_toname, '@') == NULL) { |
|
786 |
ra.err = EINVAL; |
|
787 |
goto out; |
|
788 |
} |
|
789 |
||
790 |
/* |
|
791 |
* Process the begin in syncing context. |
|
792 |
*/ |
|
793 |
if (drrb->drr_fromguid) { |
|
794 |
/* incremental backup */ |
|
795 |
dsl_dataset_t *ds = NULL; |
|
796 |
||
797 |
cp = strchr(tosnap, '@'); |
|
798 |
*cp = '\0'; |
|
799 |
ra.err = dsl_dataset_open(tosnap, DS_MODE_EXCLUSIVE, FTAG, &ds); |
|
800 |
*cp = '@'; |
|
801 |
if (ra.err) |
|
802 |
goto out; |
|
803 |
||
804 |
/* |
|
805 |
* Only do the rollback if the most recent snapshot |
|
806 |
* matches the incremental source |
|
807 |
*/ |
|
808 |
if (force) { |
|
2885 | 809 |
if (ds->ds_prev == NULL || |
810 |
ds->ds_prev->ds_phys->ds_guid != |
|
2743 | 811 |
drrb->drr_fromguid) { |
812 |
dsl_dataset_close(ds, DS_MODE_EXCLUSIVE, FTAG); |
|
3655 | 813 |
kmem_free(ra.buf, ra.bufsize); |
2743 | 814 |
return (ENODEV); |
815 |
} |
|
816 |
(void) dsl_dataset_rollback(ds); |
|
817 |
} |
|
818 |
ra.err = dsl_sync_task_do(ds->ds_dir->dd_pool, |
|
819 |
replay_incremental_check, replay_incremental_sync, |
|
820 |
ds, drrb, 1); |
|
821 |
dsl_dataset_close(ds, DS_MODE_EXCLUSIVE, FTAG); |
|
822 |
} else { |
|
823 |
/* full backup */ |
|
824 |
dsl_dir_t *dd = NULL; |
|
825 |
const char *tail; |
|
826 |
||
827 |
/* can't restore full backup into topmost fs, for now */ |
|
828 |
if (strrchr(drrb->drr_toname, '/') == NULL) { |
|
829 |
ra.err = EINVAL; |
|
830 |
goto out; |
|
831 |
} |
|
832 |
||
833 |
cp = strchr(tosnap, '@'); |
|
834 |
*cp = '\0'; |
|
835 |
ra.err = dsl_dir_open(tosnap, FTAG, &dd, &tail); |
|
836 |
*cp = '@'; |
|
837 |
if (ra.err) |
|
838 |
goto out; |
|
839 |
if (tail == NULL) { |
|
840 |
ra.err = EEXIST; |
|
841 |
goto out; |
|
842 |
} |
|
843 |
||
844 |
ra.err = dsl_sync_task_do(dd->dd_pool, replay_full_check, |
|
845 |
replay_full_sync, dd, drrb, 5); |
|
846 |
dsl_dir_close(dd, FTAG); |
|
847 |
} |
|
848 |
if (ra.err) |
|
849 |
goto out; |
|
850 |
||
851 |
/* |
|
852 |
* Open the objset we are modifying. |
|
853 |
*/ |
|
854 |
||
855 |
cp = strchr(tosnap, '@'); |
|
856 |
*cp = '\0'; |
|
857 |
ra.err = dmu_objset_open(tosnap, DMU_OST_ANY, |
|
858 |
DS_MODE_PRIMARY | DS_MODE_INCONSISTENT, &os); |
|
859 |
*cp = '@'; |
|
860 |
ASSERT3U(ra.err, ==, 0); |
|
861 |
||
862 |
/* |
|
863 |
* Read records and process them. |
|
864 |
*/ |
|
865 |
pzc = ra.zc; |
|
866 |
while (ra.err == 0 && |
|
867 |
NULL != (drr = restore_read(&ra, sizeof (*drr)))) { |
|
868 |
if (issig(JUSTLOOKING) && issig(FORREAL)) { |
|
869 |
ra.err = EINTR; |
|
870 |
goto out; |
|
871 |
} |
|
872 |
||
873 |
if (ra.byteswap) |
|
874 |
backup_byteswap(drr); |
|
875 |
||
876 |
switch (drr->drr_type) { |
|
877 |
case DRR_OBJECT: |
|
878 |
{ |
|
879 |
/* |
|
880 |
* We need to make a copy of the record header, |
|
881 |
* because restore_{object,write} may need to |
|
882 |
* restore_read(), which will invalidate drr. |
|
883 |
*/ |
|
884 |
struct drr_object drro = drr->drr_u.drr_object; |
|
885 |
ra.err = restore_object(&ra, os, &drro); |
|
886 |
break; |
|
887 |
} |
|
888 |
case DRR_FREEOBJECTS: |
|
889 |
{ |
|
890 |
struct drr_freeobjects drrfo = |
|
891 |
drr->drr_u.drr_freeobjects; |
|
892 |
ra.err = restore_freeobjects(&ra, os, &drrfo); |
|
893 |
break; |
|
894 |
} |
|
895 |
case DRR_WRITE: |
|
896 |
{ |
|
897 |
struct drr_write drrw = drr->drr_u.drr_write; |
|
898 |
ra.err = restore_write(&ra, os, &drrw); |
|
899 |
break; |
|
900 |
} |
|
901 |
case DRR_FREE: |
|
902 |
{ |
|
903 |
struct drr_free drrf = drr->drr_u.drr_free; |
|
904 |
ra.err = restore_free(&ra, os, &drrf); |
|
905 |
break; |
|
906 |
} |
|
907 |
case DRR_END: |
|
908 |
{ |
|
909 |
struct drr_end drre = drr->drr_u.drr_end; |
|
910 |
/* |
|
911 |
* We compare against the *previous* checksum |
|
912 |
* value, because the stored checksum is of |
|
913 |
* everything before the DRR_END record. |
|
914 |
*/ |
|
915 |
if (drre.drr_checksum.zc_word[0] != 0 && |
|
3093
71525e4187d5
6490569 verify arc bufs are not modified when they shouldn't be
ahrens
parents:
3087
diff
changeset
|
916 |
!ZIO_CHECKSUM_EQUAL(drre.drr_checksum, pzc)) { |
2743 | 917 |
ra.err = ECKSUM; |
918 |
goto out; |
|
919 |
} |
|
920 |
||
921 |
ra.err = dsl_sync_task_do(dmu_objset_ds(os)-> |
|
922 |
ds_dir->dd_pool, replay_end_check, replay_end_sync, |
|
923 |
os, drrb, 3); |
|
924 |
goto out; |
|
925 |
} |
|
926 |
default: |
|
927 |
ra.err = EINVAL; |
|
928 |
goto out; |
|
929 |
} |
|
930 |
pzc = ra.zc; |
|
931 |
} |
|
932 |
||
933 |
out: |
|
934 |
if (os) |
|
935 |
dmu_objset_close(os); |
|
936 |
||
937 |
/* |
|
938 |
* Make sure we don't rollback/destroy unless we actually |
|
939 |
* processed the begin properly. 'os' will only be set if this |
|
940 |
* is the case. |
|
941 |
*/ |
|
942 |
if (ra.err && os && tosnap && strchr(tosnap, '@')) { |
|
943 |
/* |
|
944 |
* rollback or destroy what we created, so we don't |
|
945 |
* leave it in the restoring state. |
|
946 |
*/ |
|
947 |
dsl_dataset_t *ds; |
|
948 |
int err; |
|
949 |
||
950 |
cp = strchr(tosnap, '@'); |
|
951 |
*cp = '\0'; |
|
952 |
err = dsl_dataset_open(tosnap, |
|
953 |
DS_MODE_EXCLUSIVE | DS_MODE_INCONSISTENT, |
|
954 |
FTAG, &ds); |
|
955 |
if (err == 0) { |
|
956 |
txg_wait_synced(ds->ds_dir->dd_pool, 0); |
|
957 |
if (drrb->drr_fromguid) { |
|
958 |
/* incremental: rollback to most recent snap */ |
|
959 |
(void) dsl_dataset_rollback(ds); |
|
960 |
dsl_dataset_close(ds, DS_MODE_EXCLUSIVE, FTAG); |
|
961 |
} else { |
|
962 |
/* full: destroy whole fs */ |
|
963 |
dsl_dataset_close(ds, DS_MODE_EXCLUSIVE, FTAG); |
|
964 |
(void) dsl_dataset_destroy(tosnap); |
|
965 |
} |
|
966 |
} |
|
967 |
*cp = '@'; |
|
968 |
} |
|
969 |
||
970 |
kmem_free(ra.buf, ra.bufsize); |
|
971 |
if (sizep) |
|
972 |
*sizep = ra.voff; |
|
973 |
return (ra.err); |
|
974 |
} |