Mercurial > illumos > illumos-gate
annotate usr/src/uts/common/fs/zfs/dsl_dataset.c @ 2856:6f4d5ee1906a
6463348 ZFS code could be more portable
| author | nd150628 |
|---|---|
| date | Tue, 03 Oct 2006 15:01:10 -0700 |
| parents | 752725c22841 |
| children | c0259887ebbc |
| rev | line source |
|---|---|
| 789 | 1 /* |
| 2 * CDDL HEADER START | |
| 3 * | |
| 4 * The contents of this file are subject to the terms of the | |
| 1544 | 5 * Common Development and Distribution License (the "License"). |
| 6 * You may not use this file except in compliance with the License. | |
| 789 | 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 /* | |
| 1544 | 22 * Copyright 2006 Sun Microsystems, Inc. All rights reserved. |
| 789 | 23 * Use is subject to license terms. |
| 24 */ | |
| 25 | |
| 26 #pragma ident "%Z%%M% %I% %E% SMI" | |
| 27 | |
| 28 #include <sys/dmu_objset.h> | |
| 29 #include <sys/dsl_dataset.h> | |
| 30 #include <sys/dsl_dir.h> | |
| 2082 | 31 #include <sys/dsl_prop.h> |
| 2199 | 32 #include <sys/dsl_synctask.h> |
| 789 | 33 #include <sys/dmu_traverse.h> |
| 34 #include <sys/dmu_tx.h> | |
| 35 #include <sys/arc.h> | |
| 36 #include <sys/zio.h> | |
| 37 #include <sys/zap.h> | |
| 38 #include <sys/unique.h> | |
| 39 #include <sys/zfs_context.h> | |
| 40 | |
| 2199 | 41 static dsl_checkfunc_t dsl_dataset_destroy_begin_check; |
| 42 static dsl_syncfunc_t dsl_dataset_destroy_begin_sync; | |
| 43 static dsl_checkfunc_t dsl_dataset_rollback_check; | |
| 44 static dsl_syncfunc_t dsl_dataset_rollback_sync; | |
| 45 static dsl_checkfunc_t dsl_dataset_destroy_check; | |
| 46 static dsl_syncfunc_t dsl_dataset_destroy_sync; | |
|
1731
1efa8b3d1296
6402598 'zfs destroy <fs>' can take a long time, stopping up the txg train
bonwick
parents:
1544
diff
changeset
|
47 |
| 789 | 48 #define DOS_REF_MAX (1ULL << 62) |
| 49 | |
| 50 #define DSL_DEADLIST_BLOCKSIZE SPA_MAXBLOCKSIZE | |
| 51 | |
| 52 /* | |
| 53 * We use weighted reference counts to express the various forms of exclusion | |
| 54 * between different open modes. A STANDARD open is 1 point, an EXCLUSIVE open | |
| 55 * is DOS_REF_MAX, and a PRIMARY open is little more than half of an EXCLUSIVE. | |
| 56 * This makes the exclusion logic simple: the total refcnt for all opens cannot | |
| 57 * exceed DOS_REF_MAX. For example, EXCLUSIVE opens are exclusive because their | |
| 58 * weight (DOS_REF_MAX) consumes the entire refcnt space. PRIMARY opens consume | |
| 59 * just over half of the refcnt space, so there can't be more than one, but it | |
| 60 * can peacefully coexist with any number of STANDARD opens. | |
| 61 */ | |
| 62 static uint64_t ds_refcnt_weight[DS_MODE_LEVELS] = { | |
| 63 0, /* DOS_MODE_NONE - invalid */ | |
| 64 1, /* DOS_MODE_STANDARD - unlimited number */ | |
| 65 (DOS_REF_MAX >> 1) + 1, /* DOS_MODE_PRIMARY - only one of these */ | |
| 66 DOS_REF_MAX /* DOS_MODE_EXCLUSIVE - no other opens */ | |
| 67 }; | |
| 68 | |
| 69 | |
| 70 void | |
| 71 dsl_dataset_block_born(dsl_dataset_t *ds, blkptr_t *bp, dmu_tx_t *tx) | |
| 72 { | |
| 2082 | 73 int used = bp_get_dasize(tx->tx_pool->dp_spa, bp); |
| 789 | 74 int compressed = BP_GET_PSIZE(bp); |
| 75 int uncompressed = BP_GET_UCSIZE(bp); | |
| 76 | |
| 77 dprintf_bp(bp, "born, ds=%p\n", ds); | |
| 78 | |
| 79 ASSERT(dmu_tx_is_syncing(tx)); | |
| 80 /* It could have been compressed away to nothing */ | |
| 81 if (BP_IS_HOLE(bp)) | |
| 82 return; | |
| 83 ASSERT(BP_GET_TYPE(bp) != DMU_OT_NONE); | |
| 84 ASSERT3U(BP_GET_TYPE(bp), <, DMU_OT_NUMTYPES); | |
| 85 if (ds == NULL) { | |
| 86 /* | |
| 87 * Account for the meta-objset space in its placeholder | |
| 88 * dsl_dir. | |
| 89 */ | |
| 90 ASSERT3U(compressed, ==, uncompressed); /* it's all metadata */ | |
| 91 dsl_dir_diduse_space(tx->tx_pool->dp_mos_dir, | |
| 92 used, compressed, uncompressed, tx); | |
| 93 dsl_dir_dirty(tx->tx_pool->dp_mos_dir, tx); | |
| 94 return; | |
| 95 } | |
| 96 dmu_buf_will_dirty(ds->ds_dbuf, tx); | |
| 97 mutex_enter(&ds->ds_lock); | |
| 98 ds->ds_phys->ds_used_bytes += used; | |
| 99 ds->ds_phys->ds_compressed_bytes += compressed; | |
| 100 ds->ds_phys->ds_uncompressed_bytes += uncompressed; | |
| 101 ds->ds_phys->ds_unique_bytes += used; | |
| 102 mutex_exit(&ds->ds_lock); | |
| 103 dsl_dir_diduse_space(ds->ds_dir, | |
| 104 used, compressed, uncompressed, tx); | |
| 105 } | |
| 106 | |
| 107 void | |
| 108 dsl_dataset_block_kill(dsl_dataset_t *ds, blkptr_t *bp, dmu_tx_t *tx) | |
| 109 { | |
| 2082 | 110 int used = bp_get_dasize(tx->tx_pool->dp_spa, bp); |
| 789 | 111 int compressed = BP_GET_PSIZE(bp); |
| 112 int uncompressed = BP_GET_UCSIZE(bp); | |
| 113 | |
| 114 ASSERT(dmu_tx_is_syncing(tx)); | |
| 115 if (BP_IS_HOLE(bp)) | |
| 116 return; | |
| 117 | |
| 118 ASSERT(used > 0); | |
| 119 if (ds == NULL) { | |
| 120 /* | |
| 121 * Account for the meta-objset space in its placeholder | |
| 122 * dataset. | |
| 123 */ | |
| 124 /* XXX this can fail, what do we do when it does? */ | |
| 125 (void) arc_free(NULL, tx->tx_pool->dp_spa, | |
| 126 tx->tx_txg, bp, NULL, NULL, ARC_WAIT); | |
| 127 bzero(bp, sizeof (blkptr_t)); | |
| 128 | |
| 129 dsl_dir_diduse_space(tx->tx_pool->dp_mos_dir, | |
| 130 -used, -compressed, -uncompressed, tx); | |
| 131 dsl_dir_dirty(tx->tx_pool->dp_mos_dir, tx); | |
| 132 return; | |
| 133 } | |
| 134 ASSERT3P(tx->tx_pool, ==, ds->ds_dir->dd_pool); | |
| 135 | |
| 136 dmu_buf_will_dirty(ds->ds_dbuf, tx); | |
| 137 | |
| 138 if (bp->blk_birth > ds->ds_phys->ds_prev_snap_txg) { | |
| 139 dprintf_bp(bp, "freeing: %s", ""); | |
| 140 /* XXX check return code? */ | |
| 141 (void) arc_free(NULL, tx->tx_pool->dp_spa, | |
| 142 tx->tx_txg, bp, NULL, NULL, ARC_WAIT); | |
| 143 | |
| 144 mutex_enter(&ds->ds_lock); | |
| 145 /* XXX unique_bytes is not accurate for head datasets */ | |
| 146 /* ASSERT3U(ds->ds_phys->ds_unique_bytes, >=, used); */ | |
| 147 ds->ds_phys->ds_unique_bytes -= used; | |
| 148 mutex_exit(&ds->ds_lock); | |
| 149 dsl_dir_diduse_space(ds->ds_dir, | |
| 150 -used, -compressed, -uncompressed, tx); | |
| 151 } else { | |
| 152 dprintf_bp(bp, "putting on dead list: %s", ""); | |
| 1544 | 153 VERIFY(0 == bplist_enqueue(&ds->ds_deadlist, bp, tx)); |
| 789 | 154 /* if (bp->blk_birth > prev prev snap txg) prev unique += bs */ |
| 155 if (ds->ds_phys->ds_prev_snap_obj != 0) { | |
| 156 ASSERT3U(ds->ds_prev->ds_object, ==, | |
| 157 ds->ds_phys->ds_prev_snap_obj); | |
| 158 ASSERT(ds->ds_prev->ds_phys->ds_num_children > 0); | |
| 159 if (ds->ds_prev->ds_phys->ds_next_snap_obj == | |
| 2082 | 160 ds->ds_object && bp->blk_birth > |
| 789 | 161 ds->ds_prev->ds_phys->ds_prev_snap_txg) { |
| 162 dmu_buf_will_dirty(ds->ds_prev->ds_dbuf, tx); | |
| 163 mutex_enter(&ds->ds_prev->ds_lock); | |
| 164 ds->ds_prev->ds_phys->ds_unique_bytes += | |
| 165 used; | |
| 166 mutex_exit(&ds->ds_prev->ds_lock); | |
| 167 } | |
| 168 } | |
| 169 } | |
| 170 bzero(bp, sizeof (blkptr_t)); | |
| 171 mutex_enter(&ds->ds_lock); | |
| 172 ASSERT3U(ds->ds_phys->ds_used_bytes, >=, used); | |
| 173 ds->ds_phys->ds_used_bytes -= used; | |
| 174 ASSERT3U(ds->ds_phys->ds_compressed_bytes, >=, compressed); | |
| 175 ds->ds_phys->ds_compressed_bytes -= compressed; | |
| 176 ASSERT3U(ds->ds_phys->ds_uncompressed_bytes, >=, uncompressed); | |
| 177 ds->ds_phys->ds_uncompressed_bytes -= uncompressed; | |
| 178 mutex_exit(&ds->ds_lock); | |
| 179 } | |
| 180 | |
| 1544 | 181 uint64_t |
| 182 dsl_dataset_prev_snap_txg(dsl_dataset_t *ds) | |
| 789 | 183 { |
| 184 if (ds == NULL) | |
| 1544 | 185 return (0); |
| 789 | 186 /* |
| 187 * The snapshot creation could fail, but that would cause an | |
| 188 * incorrect FALSE return, which would only result in an | |
| 189 * overestimation of the amount of space that an operation would | |
| 190 * consume, which is OK. | |
| 191 * | |
| 192 * There's also a small window where we could miss a pending | |
| 193 * snapshot, because we could set the sync task in the quiescing | |
| 194 * phase. So this should only be used as a guess. | |
| 195 */ | |
| 2199 | 196 return (MAX(ds->ds_phys->ds_prev_snap_txg, ds->ds_trysnap_txg)); |
| 1544 | 197 } |
| 198 | |
| 199 int | |
| 200 dsl_dataset_block_freeable(dsl_dataset_t *ds, uint64_t blk_birth) | |
| 201 { | |
| 202 return (blk_birth > dsl_dataset_prev_snap_txg(ds)); | |
| 789 | 203 } |
| 204 | |
| 205 /* ARGSUSED */ | |
| 206 static void | |
| 207 dsl_dataset_evict(dmu_buf_t *db, void *dsv) | |
| 208 { | |
| 209 dsl_dataset_t *ds = dsv; | |
| 210 dsl_pool_t *dp = ds->ds_dir->dd_pool; | |
| 211 | |
| 212 /* open_refcount == DOS_REF_MAX when deleting */ | |
| 213 ASSERT(ds->ds_open_refcount == 0 || | |
| 214 ds->ds_open_refcount == DOS_REF_MAX); | |
| 215 | |
| 216 dprintf_ds(ds, "evicting %s\n", ""); | |
| 217 | |
| 218 unique_remove(ds->ds_phys->ds_fsid_guid); | |
| 219 | |
| 220 if (ds->ds_user_ptr != NULL) | |
| 221 ds->ds_user_evict_func(ds, ds->ds_user_ptr); | |
| 222 | |
| 223 if (ds->ds_prev) { | |
| 224 dsl_dataset_close(ds->ds_prev, DS_MODE_NONE, ds); | |
| 225 ds->ds_prev = NULL; | |
| 226 } | |
| 227 | |
| 228 bplist_close(&ds->ds_deadlist); | |
| 229 dsl_dir_close(ds->ds_dir, ds); | |
| 230 | |
| 231 if (list_link_active(&ds->ds_synced_link)) | |
| 232 list_remove(&dp->dp_synced_objsets, ds); | |
| 233 | |
| 2856 | 234 mutex_destroy(&ds->ds_lock); |
| 235 mutex_destroy(&ds->ds_deadlist.bpl_lock); | |
| 236 | |
| 789 | 237 kmem_free(ds, sizeof (dsl_dataset_t)); |
| 238 } | |
| 239 | |
| 1544 | 240 static int |
| 789 | 241 dsl_dataset_get_snapname(dsl_dataset_t *ds) |
| 242 { | |
| 243 dsl_dataset_phys_t *headphys; | |
| 244 int err; | |
| 245 dmu_buf_t *headdbuf; | |
| 246 dsl_pool_t *dp = ds->ds_dir->dd_pool; | |
| 247 objset_t *mos = dp->dp_meta_objset; | |
| 248 | |
| 249 if (ds->ds_snapname[0]) | |
| 1544 | 250 return (0); |
| 789 | 251 if (ds->ds_phys->ds_next_snap_obj == 0) |
| 1544 | 252 return (0); |
| 789 | 253 |
| 1544 | 254 err = dmu_bonus_hold(mos, ds->ds_dir->dd_phys->dd_head_dataset_obj, |
| 255 FTAG, &headdbuf); | |
| 256 if (err) | |
| 257 return (err); | |
| 789 | 258 headphys = headdbuf->db_data; |
| 259 err = zap_value_search(dp->dp_meta_objset, | |
| 260 headphys->ds_snapnames_zapobj, ds->ds_object, ds->ds_snapname); | |
| 1544 | 261 dmu_buf_rele(headdbuf, FTAG); |
| 262 return (err); | |
| 789 | 263 } |
| 264 | |
| 1544 | 265 int |
| 789 | 266 dsl_dataset_open_obj(dsl_pool_t *dp, uint64_t dsobj, const char *snapname, |
| 1544 | 267 int mode, void *tag, dsl_dataset_t **dsp) |
| 789 | 268 { |
| 269 uint64_t weight = ds_refcnt_weight[DS_MODE_LEVEL(mode)]; | |
| 270 objset_t *mos = dp->dp_meta_objset; | |
| 271 dmu_buf_t *dbuf; | |
| 272 dsl_dataset_t *ds; | |
| 1544 | 273 int err; |
| 789 | 274 |
| 275 ASSERT(RW_LOCK_HELD(&dp->dp_config_rwlock) || | |
| 276 dsl_pool_sync_context(dp)); | |
| 277 | |
| 1544 | 278 err = dmu_bonus_hold(mos, dsobj, tag, &dbuf); |
| 279 if (err) | |
| 280 return (err); | |
| 789 | 281 ds = dmu_buf_get_user(dbuf); |
| 282 if (ds == NULL) { | |
| 283 dsl_dataset_t *winner; | |
| 284 | |
| 285 ds = kmem_zalloc(sizeof (dsl_dataset_t), KM_SLEEP); | |
| 286 ds->ds_dbuf = dbuf; | |
| 287 ds->ds_object = dsobj; | |
| 288 ds->ds_phys = dbuf->db_data; | |
| 289 | |
| 2856 | 290 mutex_init(&ds->ds_lock, NULL, MUTEX_DEFAULT, NULL); |
| 291 mutex_init(&ds->ds_deadlist.bpl_lock, NULL, MUTEX_DEFAULT, | |
| 292 NULL); | |
| 293 | |
| 1544 | 294 err = bplist_open(&ds->ds_deadlist, |
| 789 | 295 mos, ds->ds_phys->ds_deadlist_obj); |
| 1544 | 296 if (err == 0) { |
| 297 err = dsl_dir_open_obj(dp, | |
| 298 ds->ds_phys->ds_dir_obj, NULL, ds, &ds->ds_dir); | |
| 299 } | |
| 300 if (err) { | |
| 301 /* | |
| 302 * we don't really need to close the blist if we | |
| 303 * just opened it. | |
| 304 */ | |
| 2856 | 305 mutex_destroy(&ds->ds_lock); |
| 306 mutex_destroy(&ds->ds_deadlist.bpl_lock); | |
| 1544 | 307 kmem_free(ds, sizeof (dsl_dataset_t)); |
| 308 dmu_buf_rele(dbuf, tag); | |
| 309 return (err); | |
| 310 } | |
| 789 | 311 |
| 312 if (ds->ds_dir->dd_phys->dd_head_dataset_obj == dsobj) { | |
| 313 ds->ds_snapname[0] = '\0'; | |
| 314 if (ds->ds_phys->ds_prev_snap_obj) { | |
| 1544 | 315 err = dsl_dataset_open_obj(dp, |
| 789 | 316 ds->ds_phys->ds_prev_snap_obj, NULL, |
| 1544 | 317 DS_MODE_NONE, ds, &ds->ds_prev); |
| 789 | 318 } |
| 319 } else { | |
| 320 if (snapname) { | |
| 321 #ifdef ZFS_DEBUG | |
| 322 dsl_dataset_phys_t *headphys; | |
| 1544 | 323 dmu_buf_t *headdbuf; |
| 324 err = dmu_bonus_hold(mos, | |
| 325 ds->ds_dir->dd_phys->dd_head_dataset_obj, | |
| 326 FTAG, &headdbuf); | |
| 327 if (err == 0) { | |
| 328 headphys = headdbuf->db_data; | |
| 329 uint64_t foundobj; | |
| 330 err = zap_lookup(dp->dp_meta_objset, | |
| 331 headphys->ds_snapnames_zapobj, | |
| 332 snapname, sizeof (foundobj), 1, | |
| 333 &foundobj); | |
| 334 ASSERT3U(foundobj, ==, dsobj); | |
| 335 dmu_buf_rele(headdbuf, FTAG); | |
| 336 } | |
| 789 | 337 #endif |
| 338 (void) strcat(ds->ds_snapname, snapname); | |
| 339 } else if (zfs_flags & ZFS_DEBUG_SNAPNAMES) { | |
| 1544 | 340 err = dsl_dataset_get_snapname(ds); |
| 789 | 341 } |
| 342 } | |
| 343 | |
| 1544 | 344 if (err == 0) { |
| 345 winner = dmu_buf_set_user_ie(dbuf, ds, &ds->ds_phys, | |
| 346 dsl_dataset_evict); | |
| 347 } | |
| 348 if (err || winner) { | |
| 789 | 349 bplist_close(&ds->ds_deadlist); |
| 350 if (ds->ds_prev) { | |
| 351 dsl_dataset_close(ds->ds_prev, | |
| 352 DS_MODE_NONE, ds); | |
| 353 } | |
| 354 dsl_dir_close(ds->ds_dir, ds); | |
| 2856 | 355 mutex_destroy(&ds->ds_lock); |
| 356 mutex_destroy(&ds->ds_deadlist.bpl_lock); | |
| 789 | 357 kmem_free(ds, sizeof (dsl_dataset_t)); |
| 1544 | 358 if (err) { |
| 359 dmu_buf_rele(dbuf, tag); | |
| 360 return (err); | |
| 361 } | |
| 789 | 362 ds = winner; |
| 363 } else { | |
| 364 uint64_t new = | |
| 365 unique_insert(ds->ds_phys->ds_fsid_guid); | |
| 366 if (new != ds->ds_phys->ds_fsid_guid) { | |
| 367 /* XXX it won't necessarily be synced... */ | |
| 368 ds->ds_phys->ds_fsid_guid = new; | |
| 369 } | |
| 370 } | |
| 371 } | |
| 372 ASSERT3P(ds->ds_dbuf, ==, dbuf); | |
| 373 ASSERT3P(ds->ds_phys, ==, dbuf->db_data); | |
| 374 | |
| 375 mutex_enter(&ds->ds_lock); | |
| 376 if ((DS_MODE_LEVEL(mode) == DS_MODE_PRIMARY && | |
| 2082 | 377 (ds->ds_phys->ds_flags & DS_FLAG_INCONSISTENT) && |
| 378 !DS_MODE_IS_INCONSISTENT(mode)) || | |
| 789 | 379 (ds->ds_open_refcount + weight > DOS_REF_MAX)) { |
| 380 mutex_exit(&ds->ds_lock); | |
| 381 dsl_dataset_close(ds, DS_MODE_NONE, tag); | |
| 1544 | 382 return (EBUSY); |
| 789 | 383 } |
| 384 ds->ds_open_refcount += weight; | |
| 385 mutex_exit(&ds->ds_lock); | |
| 386 | |
| 1544 | 387 *dsp = ds; |
| 388 return (0); | |
| 789 | 389 } |
| 390 | |
| 391 int | |
| 392 dsl_dataset_open_spa(spa_t *spa, const char *name, int mode, | |
| 393 void *tag, dsl_dataset_t **dsp) | |
| 394 { | |
| 395 dsl_dir_t *dd; | |
| 396 dsl_pool_t *dp; | |
| 397 const char *tail; | |
| 398 uint64_t obj; | |
| 399 dsl_dataset_t *ds = NULL; | |
| 400 int err = 0; | |
| 401 | |
| 1544 | 402 err = dsl_dir_open_spa(spa, name, FTAG, &dd, &tail); |
| 403 if (err) | |
| 404 return (err); | |
| 789 | 405 |
| 406 dp = dd->dd_pool; | |
| 407 obj = dd->dd_phys->dd_head_dataset_obj; | |
| 408 rw_enter(&dp->dp_config_rwlock, RW_READER); | |
| 409 if (obj == 0) { | |
| 410 /* A dataset with no associated objset */ | |
| 411 err = ENOENT; | |
| 412 goto out; | |
| 413 } | |
| 414 | |
| 415 if (tail != NULL) { | |
| 416 objset_t *mos = dp->dp_meta_objset; | |
| 417 | |
| 1544 | 418 err = dsl_dataset_open_obj(dp, obj, NULL, |
| 419 DS_MODE_NONE, tag, &ds); | |
| 420 if (err) | |
| 421 goto out; | |
| 789 | 422 obj = ds->ds_phys->ds_snapnames_zapobj; |
| 423 dsl_dataset_close(ds, DS_MODE_NONE, tag); | |
| 424 ds = NULL; | |
| 425 | |
| 426 if (tail[0] != '@') { | |
| 427 err = ENOENT; | |
| 428 goto out; | |
| 429 } | |
| 430 tail++; | |
| 431 | |
| 432 /* Look for a snapshot */ | |
| 433 if (!DS_MODE_IS_READONLY(mode)) { | |
| 434 err = EROFS; | |
| 435 goto out; | |
| 436 } | |
| 437 dprintf("looking for snapshot '%s'\n", tail); | |
| 438 err = zap_lookup(mos, obj, tail, 8, 1, &obj); | |
| 439 if (err) | |
| 440 goto out; | |
| 441 } | |
| 1544 | 442 err = dsl_dataset_open_obj(dp, obj, tail, mode, tag, &ds); |
| 789 | 443 |
| 444 out: | |
| 445 rw_exit(&dp->dp_config_rwlock); | |
| 446 dsl_dir_close(dd, FTAG); | |
| 447 | |
| 448 ASSERT3U((err == 0), ==, (ds != NULL)); | |
| 449 /* ASSERT(ds == NULL || strcmp(name, ds->ds_name) == 0); */ | |
| 450 | |
| 451 *dsp = ds; | |
| 452 return (err); | |
| 453 } | |
| 454 | |
| 455 int | |
| 456 dsl_dataset_open(const char *name, int mode, void *tag, dsl_dataset_t **dsp) | |
| 457 { | |
| 458 return (dsl_dataset_open_spa(NULL, name, mode, tag, dsp)); | |
| 459 } | |
| 460 | |
| 461 void | |
| 462 dsl_dataset_name(dsl_dataset_t *ds, char *name) | |
| 463 { | |
| 464 if (ds == NULL) { | |
| 465 (void) strcpy(name, "mos"); | |
| 466 } else { | |
| 467 dsl_dir_name(ds->ds_dir, name); | |
| 1544 | 468 VERIFY(0 == dsl_dataset_get_snapname(ds)); |
| 789 | 469 if (ds->ds_snapname[0]) { |
| 470 (void) strcat(name, "@"); | |
| 471 if (!MUTEX_HELD(&ds->ds_lock)) { | |
| 472 /* | |
| 473 * We use a "recursive" mutex so that we | |
| 474 * can call dprintf_ds() with ds_lock held. | |
| 475 */ | |
| 476 mutex_enter(&ds->ds_lock); | |
| 477 (void) strcat(name, ds->ds_snapname); | |
| 478 mutex_exit(&ds->ds_lock); | |
| 479 } else { | |
| 480 (void) strcat(name, ds->ds_snapname); | |
| 481 } | |
| 482 } | |
| 483 } | |
| 484 } | |
| 485 | |
| 486 void | |
| 487 dsl_dataset_close(dsl_dataset_t *ds, int mode, void *tag) | |
| 488 { | |
| 489 uint64_t weight = ds_refcnt_weight[DS_MODE_LEVEL(mode)]; | |
| 490 mutex_enter(&ds->ds_lock); | |
| 491 ASSERT3U(ds->ds_open_refcount, >=, weight); | |
| 492 ds->ds_open_refcount -= weight; | |
| 493 dprintf_ds(ds, "closing mode %u refcount now 0x%llx\n", | |
| 494 mode, ds->ds_open_refcount); | |
| 495 mutex_exit(&ds->ds_lock); | |
| 496 | |
| 1544 | 497 dmu_buf_rele(ds->ds_dbuf, tag); |
| 789 | 498 } |
| 499 | |
| 500 void | |
| 501 dsl_dataset_create_root(dsl_pool_t *dp, uint64_t *ddobjp, dmu_tx_t *tx) | |
| 502 { | |
| 503 objset_t *mos = dp->dp_meta_objset; | |
| 504 dmu_buf_t *dbuf; | |
| 505 dsl_dataset_phys_t *dsphys; | |
| 506 dsl_dataset_t *ds; | |
| 507 uint64_t dsobj; | |
| 508 dsl_dir_t *dd; | |
| 509 | |
| 510 dsl_dir_create_root(mos, ddobjp, tx); | |
| 1544 | 511 VERIFY(0 == dsl_dir_open_obj(dp, *ddobjp, NULL, FTAG, &dd)); |
| 789 | 512 |
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513 dsobj = dmu_object_alloc(mos, DMU_OT_DSL_DATASET, 0, |
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514 DMU_OT_DSL_DATASET, sizeof (dsl_dataset_phys_t), tx); |
| 1544 | 515 VERIFY(0 == dmu_bonus_hold(mos, dsobj, FTAG, &dbuf)); |
| 789 | 516 dmu_buf_will_dirty(dbuf, tx); |
| 517 dsphys = dbuf->db_data; | |
| 518 dsphys->ds_dir_obj = dd->dd_object; | |
| 519 dsphys->ds_fsid_guid = unique_create(); | |
| 1544 | 520 unique_remove(dsphys->ds_fsid_guid); /* it isn't open yet */ |
| 789 | 521 (void) random_get_pseudo_bytes((void*)&dsphys->ds_guid, |
| 522 sizeof (dsphys->ds_guid)); | |
| 523 dsphys->ds_snapnames_zapobj = | |
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524 zap_create(mos, DMU_OT_DSL_DS_SNAP_MAP, DMU_OT_NONE, 0, tx); |
| 789 | 525 dsphys->ds_creation_time = gethrestime_sec(); |
| 526 dsphys->ds_creation_txg = tx->tx_txg; | |
| 527 dsphys->ds_deadlist_obj = | |
| 528 bplist_create(mos, DSL_DEADLIST_BLOCKSIZE, tx); | |
| 1544 | 529 dmu_buf_rele(dbuf, FTAG); |
| 789 | 530 |
| 531 dmu_buf_will_dirty(dd->dd_dbuf, tx); | |
| 532 dd->dd_phys->dd_head_dataset_obj = dsobj; | |
| 533 dsl_dir_close(dd, FTAG); | |
| 534 | |
| 1544 | 535 VERIFY(0 == |
| 536 dsl_dataset_open_obj(dp, dsobj, NULL, DS_MODE_NONE, FTAG, &ds)); | |
| 789 | 537 (void) dmu_objset_create_impl(dp->dp_spa, ds, DMU_OST_ZFS, tx); |
| 538 dsl_dataset_close(ds, DS_MODE_NONE, FTAG); | |
| 539 } | |
| 540 | |
| 2199 | 541 uint64_t |
| 542 dsl_dataset_create_sync(dsl_dir_t *pdd, | |
| 789 | 543 const char *lastname, dsl_dataset_t *clone_parent, dmu_tx_t *tx) |
| 544 { | |
| 2199 | 545 dsl_pool_t *dp = pdd->dd_pool; |
| 789 | 546 dmu_buf_t *dbuf; |
| 547 dsl_dataset_phys_t *dsphys; | |
| 2199 | 548 uint64_t dsobj, ddobj; |
| 789 | 549 objset_t *mos = dp->dp_meta_objset; |
| 550 dsl_dir_t *dd; | |
| 551 | |
| 2199 | 552 ASSERT(clone_parent == NULL || clone_parent->ds_dir->dd_pool == dp); |
| 553 ASSERT(clone_parent == NULL || | |
| 554 clone_parent->ds_phys->ds_num_children > 0); | |
| 789 | 555 ASSERT(lastname[0] != '@'); |
| 556 ASSERT(dmu_tx_is_syncing(tx)); | |
| 557 | |
| 2199 | 558 ddobj = dsl_dir_create_sync(pdd, lastname, tx); |
| 559 VERIFY(0 == dsl_dir_open_obj(dp, ddobj, lastname, FTAG, &dd)); | |
| 789 | 560 |
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561 dsobj = dmu_object_alloc(mos, DMU_OT_DSL_DATASET, 0, |
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562 DMU_OT_DSL_DATASET, sizeof (dsl_dataset_phys_t), tx); |
| 1544 | 563 VERIFY(0 == dmu_bonus_hold(mos, dsobj, FTAG, &dbuf)); |
| 789 | 564 dmu_buf_will_dirty(dbuf, tx); |
| 565 dsphys = dbuf->db_data; | |
| 566 dsphys->ds_dir_obj = dd->dd_object; | |
| 567 dsphys->ds_fsid_guid = unique_create(); | |
| 568 unique_remove(dsphys->ds_fsid_guid); /* it isn't open yet */ | |
| 569 (void) random_get_pseudo_bytes((void*)&dsphys->ds_guid, | |
| 570 sizeof (dsphys->ds_guid)); | |
| 571 dsphys->ds_snapnames_zapobj = | |
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572 zap_create(mos, DMU_OT_DSL_DS_SNAP_MAP, DMU_OT_NONE, 0, tx); |
| 789 | 573 dsphys->ds_creation_time = gethrestime_sec(); |
| 574 dsphys->ds_creation_txg = tx->tx_txg; | |
| 575 dsphys->ds_deadlist_obj = | |
| 576 bplist_create(mos, DSL_DEADLIST_BLOCKSIZE, tx); | |
| 577 if (clone_parent) { | |
| 578 dsphys->ds_prev_snap_obj = clone_parent->ds_object; | |
| 579 dsphys->ds_prev_snap_txg = | |
| 580 clone_parent->ds_phys->ds_creation_txg; | |
| 581 dsphys->ds_used_bytes = | |
| 582 clone_parent->ds_phys->ds_used_bytes; | |
| 583 dsphys->ds_compressed_bytes = | |
| 584 clone_parent->ds_phys->ds_compressed_bytes; | |
| 585 dsphys->ds_uncompressed_bytes = | |
| 586 clone_parent->ds_phys->ds_uncompressed_bytes; | |
| 587 dsphys->ds_bp = clone_parent->ds_phys->ds_bp; | |
| 588 | |
| 589 dmu_buf_will_dirty(clone_parent->ds_dbuf, tx); | |
| 590 clone_parent->ds_phys->ds_num_children++; | |
| 591 | |
| 592 dmu_buf_will_dirty(dd->dd_dbuf, tx); | |
| 593 dd->dd_phys->dd_clone_parent_obj = clone_parent->ds_object; | |
| 594 } | |
| 1544 | 595 dmu_buf_rele(dbuf, FTAG); |
| 789 | 596 |
| 597 dmu_buf_will_dirty(dd->dd_dbuf, tx); | |
| 598 dd->dd_phys->dd_head_dataset_obj = dsobj; | |
| 599 dsl_dir_close(dd, FTAG); | |
| 600 | |
| 2199 | 601 return (dsobj); |
| 602 } | |
| 603 | |
| 604 struct destroyarg { | |
| 605 dsl_sync_task_group_t *dstg; | |
| 606 char *snapname; | |
| 607 void *tag; | |
| 608 char *failed; | |
| 609 }; | |
| 610 | |
| 611 static int | |
| 612 dsl_snapshot_destroy_one(char *name, void *arg) | |
| 613 { | |
| 614 struct destroyarg *da = arg; | |
| 615 dsl_dataset_t *ds; | |
| 616 char *cp; | |
| 617 int err; | |
| 618 | |
| 619 (void) strcat(name, "@"); | |
| 620 (void) strcat(name, da->snapname); | |
| 621 err = dsl_dataset_open(name, | |
| 622 DS_MODE_EXCLUSIVE | DS_MODE_READONLY | DS_MODE_INCONSISTENT, | |
| 623 da->tag, &ds); | |
| 624 cp = strchr(name, '@'); | |
| 625 *cp = '\0'; | |
| 626 if (err == ENOENT) | |
| 627 return (0); | |
| 628 if (err) { | |
| 629 (void) strcpy(da->failed, name); | |
| 630 return (err); | |
| 631 } | |
| 632 | |
| 633 dsl_sync_task_create(da->dstg, dsl_dataset_destroy_check, | |
| 634 dsl_dataset_destroy_sync, ds, da->tag, 0); | |
| 789 | 635 return (0); |
| 636 } | |
| 637 | |
| 2199 | 638 /* |
| 639 * Destroy 'snapname' in all descendants of 'fsname'. | |
| 640 */ | |
| 641 #pragma weak dmu_snapshots_destroy = dsl_snapshots_destroy | |
| 642 int | |
| 643 dsl_snapshots_destroy(char *fsname, char *snapname) | |
| 644 { | |
| 645 int err; | |
| 646 struct destroyarg da; | |
| 647 dsl_sync_task_t *dst; | |
| 648 spa_t *spa; | |
| 649 char *cp; | |
| 650 | |
| 651 cp = strchr(fsname, '/'); | |
| 652 if (cp) { | |
| 653 *cp = '\0'; | |
| 654 err = spa_open(fsname, &spa, FTAG); | |
| 655 *cp = '/'; | |
| 656 } else { | |
| 657 err = spa_open(fsname, &spa, FTAG); | |
| 658 } | |
| 659 if (err) | |
| 660 return (err); | |
| 661 da.dstg = dsl_sync_task_group_create(spa_get_dsl(spa)); | |
| 662 da.snapname = snapname; | |
| 663 da.tag = FTAG; | |
| 664 da.failed = fsname; | |
| 665 | |
| 666 err = dmu_objset_find(fsname, | |
| 2417 | 667 dsl_snapshot_destroy_one, &da, DS_FIND_CHILDREN); |
| 2199 | 668 |
| 669 if (err == 0) | |
| 670 err = dsl_sync_task_group_wait(da.dstg); | |
| 671 | |
| 672 for (dst = list_head(&da.dstg->dstg_tasks); dst; | |
| 673 dst = list_next(&da.dstg->dstg_tasks, dst)) { | |
| 674 dsl_dataset_t *ds = dst->dst_arg1; | |
| 675 if (dst->dst_err) { | |
| 676 dsl_dataset_name(ds, fsname); | |
| 677 cp = strchr(fsname, '@'); | |
| 678 *cp = '\0'; | |
| 679 } | |
| 680 /* | |
| 681 * If it was successful, destroy_sync would have | |
| 682 * closed the ds | |
| 683 */ | |
| 684 if (err) | |
| 685 dsl_dataset_close(ds, DS_MODE_EXCLUSIVE, FTAG); | |
| 686 } | |
| 687 | |
| 688 dsl_sync_task_group_destroy(da.dstg); | |
| 689 spa_close(spa, FTAG); | |
| 690 return (err); | |
| 691 } | |
| 692 | |
| 789 | 693 int |
| 694 dsl_dataset_destroy(const char *name) | |
| 695 { | |
| 696 int err; | |
| 2199 | 697 dsl_sync_task_group_t *dstg; |
| 698 objset_t *os; | |
| 699 dsl_dataset_t *ds; | |
| 789 | 700 dsl_dir_t *dd; |
| 2199 | 701 uint64_t obj; |
| 702 | |
| 703 if (strchr(name, '@')) { | |
| 704 /* Destroying a snapshot is simpler */ | |
| 705 err = dsl_dataset_open(name, | |
| 706 DS_MODE_EXCLUSIVE | DS_MODE_READONLY | DS_MODE_INCONSISTENT, | |
| 707 FTAG, &ds); | |
| 708 if (err) | |
| 709 return (err); | |
| 710 err = dsl_sync_task_do(ds->ds_dir->dd_pool, | |
| 711 dsl_dataset_destroy_check, dsl_dataset_destroy_sync, | |
| 712 ds, FTAG, 0); | |
| 713 if (err) | |
| 714 dsl_dataset_close(ds, DS_MODE_EXCLUSIVE, FTAG); | |
| 715 return (err); | |
| 716 } | |
| 717 | |
| 718 err = dmu_objset_open(name, DMU_OST_ANY, | |
| 719 DS_MODE_EXCLUSIVE | DS_MODE_INCONSISTENT, &os); | |
| 720 if (err) | |
| 721 return (err); | |
| 722 ds = os->os->os_dsl_dataset; | |
| 723 dd = ds->ds_dir; | |
| 789 | 724 |
| 2199 | 725 /* |
| 726 * Check for errors and mark this ds as inconsistent, in | |
| 727 * case we crash while freeing the objects. | |
| 728 */ | |
| 729 err = dsl_sync_task_do(dd->dd_pool, dsl_dataset_destroy_begin_check, | |
| 730 dsl_dataset_destroy_begin_sync, ds, NULL, 0); | |
| 731 if (err) { | |
| 732 dmu_objset_close(os); | |
| 733 return (err); | |
| 734 } | |
| 735 | |
| 736 /* | |
| 737 * remove the objects in open context, so that we won't | |
| 738 * have too much to do in syncing context. | |
| 739 */ | |
| 740 for (obj = 0; err == 0; | |
| 741 err = dmu_object_next(os, &obj, FALSE)) { | |
| 742 dmu_tx_t *tx = dmu_tx_create(os); | |
| 743 dmu_tx_hold_free(tx, obj, 0, DMU_OBJECT_END); | |
| 744 dmu_tx_hold_bonus(tx, obj); | |
| 745 err = dmu_tx_assign(tx, TXG_WAIT); | |
| 746 if (err) { | |
| 747 /* | |
| 748 * Perhaps there is not enough disk | |
| 749 * space. Just deal with it from | |
| 750 * dsl_dataset_destroy_sync(). | |
| 751 */ | |
| 752 dmu_tx_abort(tx); | |
| 753 continue; | |
| 754 } | |
| 755 VERIFY(0 == dmu_object_free(os, obj, tx)); | |
| 756 dmu_tx_commit(tx); | |
| 757 } | |
| 758 /* Make sure it's not dirty before we finish destroying it. */ | |
| 759 txg_wait_synced(dd->dd_pool, 0); | |
| 760 | |
| 761 dmu_objset_close(os); | |
| 762 if (err != ESRCH) | |
| 763 return (err); | |
| 764 | |
| 765 err = dsl_dataset_open(name, | |
| 766 DS_MODE_EXCLUSIVE | DS_MODE_READONLY | DS_MODE_INCONSISTENT, | |
| 767 FTAG, &ds); | |
| 1544 | 768 if (err) |
| 769 return (err); | |
| 789 | 770 |
| 2199 | 771 err = dsl_dir_open(name, FTAG, &dd, NULL); |
| 772 if (err) { | |
| 773 dsl_dataset_close(ds, DS_MODE_EXCLUSIVE, FTAG); | |
| 774 return (err); | |
| 789 | 775 } |
| 776 | |
| 2199 | 777 /* |
| 778 * Blow away the dsl_dir + head dataset. | |
| 779 */ | |
| 780 dstg = dsl_sync_task_group_create(ds->ds_dir->dd_pool); | |
| 781 dsl_sync_task_create(dstg, dsl_dataset_destroy_check, | |
| 782 dsl_dataset_destroy_sync, ds, FTAG, 0); | |
| 783 dsl_sync_task_create(dstg, dsl_dir_destroy_check, | |
| 784 dsl_dir_destroy_sync, dd, FTAG, 0); | |
| 785 err = dsl_sync_task_group_wait(dstg); | |
| 786 dsl_sync_task_group_destroy(dstg); | |
| 787 /* if it is successful, *destroy_sync will close the ds+dd */ | |
| 788 if (err) { | |
| 789 dsl_dataset_close(ds, DS_MODE_EXCLUSIVE, FTAG); | |
| 790 dsl_dir_close(dd, FTAG); | |
| 791 } | |
| 789 | 792 return (err); |
| 793 } | |
| 794 | |
| 795 int | |
| 2199 | 796 dsl_dataset_rollback(dsl_dataset_t *ds) |
| 789 | 797 { |
| 2199 | 798 ASSERT3U(ds->ds_open_refcount, ==, DOS_REF_MAX); |
| 799 return (dsl_sync_task_do(ds->ds_dir->dd_pool, | |
| 800 dsl_dataset_rollback_check, dsl_dataset_rollback_sync, | |
| 801 ds, NULL, 0)); | |
| 789 | 802 } |
| 803 | |
| 804 void * | |
| 805 dsl_dataset_set_user_ptr(dsl_dataset_t *ds, | |
| 806 void *p, dsl_dataset_evict_func_t func) | |
| 807 { | |
| 808 void *old; | |
| 809 | |
| 810 mutex_enter(&ds->ds_lock); | |
| 811 old = ds->ds_user_ptr; | |
| 812 if (old == NULL) { | |
| 813 ds->ds_user_ptr = p; | |
| 814 ds->ds_user_evict_func = func; | |
| 815 } | |
| 816 mutex_exit(&ds->ds_lock); | |
| 817 return (old); | |
| 818 } | |
| 819 | |
| 820 void * | |
| 821 dsl_dataset_get_user_ptr(dsl_dataset_t *ds) | |
| 822 { | |
| 823 return (ds->ds_user_ptr); | |
| 824 } | |
| 825 | |
| 826 | |
| 827 void | |
| 828 dsl_dataset_get_blkptr(dsl_dataset_t *ds, blkptr_t *bp) | |
| 829 { | |
| 830 *bp = ds->ds_phys->ds_bp; | |
| 831 } | |
| 832 | |
| 833 void | |
| 834 dsl_dataset_set_blkptr(dsl_dataset_t *ds, blkptr_t *bp, dmu_tx_t *tx) | |
| 835 { | |
| 836 ASSERT(dmu_tx_is_syncing(tx)); | |
| 837 /* If it's the meta-objset, set dp_meta_rootbp */ | |
| 838 if (ds == NULL) { | |
| 839 tx->tx_pool->dp_meta_rootbp = *bp; | |
| 840 } else { | |
| 841 dmu_buf_will_dirty(ds->ds_dbuf, tx); | |
| 842 ds->ds_phys->ds_bp = *bp; | |
| 843 } | |
| 844 } | |
| 845 | |
| 846 spa_t * | |
| 847 dsl_dataset_get_spa(dsl_dataset_t *ds) | |
| 848 { | |
| 849 return (ds->ds_dir->dd_pool->dp_spa); | |
| 850 } | |
| 851 | |
| 852 void | |
| 853 dsl_dataset_dirty(dsl_dataset_t *ds, dmu_tx_t *tx) | |
| 854 { | |
| 855 dsl_pool_t *dp; | |
| 856 | |
| 857 if (ds == NULL) /* this is the meta-objset */ | |
| 858 return; | |
| 859 | |
| 860 ASSERT(ds->ds_user_ptr != NULL); | |
| 861 ASSERT(ds->ds_phys->ds_next_snap_obj == 0); | |
| 862 | |
| 863 dp = ds->ds_dir->dd_pool; | |
| 864 | |
| 865 if (txg_list_add(&dp->dp_dirty_datasets, ds, tx->tx_txg) == 0) { | |
| 866 /* up the hold count until we can be written out */ | |
| 867 dmu_buf_add_ref(ds->ds_dbuf, ds); | |
| 868 } | |
| 869 } | |
| 870 | |
| 871 struct killarg { | |
| 872 uint64_t *usedp; | |
| 873 uint64_t *compressedp; | |
| 874 uint64_t *uncompressedp; | |
| 875 zio_t *zio; | |
| 876 dmu_tx_t *tx; | |
| 877 }; | |
| 878 | |
| 879 static int | |
| 880 kill_blkptr(traverse_blk_cache_t *bc, spa_t *spa, void *arg) | |
| 881 { | |
| 882 struct killarg *ka = arg; | |
| 883 blkptr_t *bp = &bc->bc_blkptr; | |
| 884 | |
| 885 ASSERT3U(bc->bc_errno, ==, 0); | |
| 886 | |
| 887 /* | |
| 888 * Since this callback is not called concurrently, no lock is | |
| 889 * needed on the accounting values. | |
| 890 */ | |
| 2082 | 891 *ka->usedp += bp_get_dasize(spa, bp); |
| 789 | 892 *ka->compressedp += BP_GET_PSIZE(bp); |
| 893 *ka->uncompressedp += BP_GET_UCSIZE(bp); | |
| 894 /* XXX check for EIO? */ | |
| 895 (void) arc_free(ka->zio, spa, ka->tx->tx_txg, bp, NULL, NULL, | |
| 896 ARC_NOWAIT); | |
| 897 return (0); | |
| 898 } | |
| 899 | |
| 900 /* ARGSUSED */ | |
| 2199 | 901 static int |
| 902 dsl_dataset_rollback_check(void *arg1, void *arg2, dmu_tx_t *tx) | |
| 789 | 903 { |
| 2199 | 904 dsl_dataset_t *ds = arg1; |
| 789 | 905 |
| 2199 | 906 /* |
| 907 * There must be a previous snapshot. I suppose we could roll | |
| 908 * it back to being empty (and re-initialize the upper (ZPL) | |
| 909 * layer). But for now there's no way to do this via the user | |
| 910 * interface. | |
| 911 */ | |
| 912 if (ds->ds_phys->ds_prev_snap_txg == 0) | |
| 789 | 913 return (EINVAL); |
| 914 | |
| 2199 | 915 /* |
| 916 * This must not be a snapshot. | |
| 917 */ | |
| 918 if (ds->ds_phys->ds_next_snap_obj != 0) | |
| 919 return (EINVAL); | |
| 789 | 920 |
| 921 /* | |
| 922 * If we made changes this txg, traverse_dsl_dataset won't find | |
| 923 * them. Try again. | |
| 924 */ | |
| 2199 | 925 if (ds->ds_phys->ds_bp.blk_birth >= tx->tx_txg) |
| 789 | 926 return (EAGAIN); |
| 2199 | 927 |
| 928 return (0); | |
| 929 } | |
| 789 | 930 |
| 2199 | 931 /* ARGSUSED */ |
| 932 static void | |
| 933 dsl_dataset_rollback_sync(void *arg1, void *arg2, dmu_tx_t *tx) | |
| 934 { | |
| 935 dsl_dataset_t *ds = arg1; | |
| 936 objset_t *mos = ds->ds_dir->dd_pool->dp_meta_objset; | |
| 789 | 937 |
| 938 dmu_buf_will_dirty(ds->ds_dbuf, tx); | |
| 939 | |
| 940 /* Zero out the deadlist. */ | |
| 941 bplist_close(&ds->ds_deadlist); | |
| 942 bplist_destroy(mos, ds->ds_phys->ds_deadlist_obj, tx); | |
| 943 ds->ds_phys->ds_deadlist_obj = | |
| 944 bplist_create(mos, DSL_DEADLIST_BLOCKSIZE, tx); | |
| 1544 | 945 VERIFY(0 == bplist_open(&ds->ds_deadlist, mos, |
| 946 ds->ds_phys->ds_deadlist_obj)); | |
| 789 | 947 |
| 948 { | |
| 949 /* Free blkptrs that we gave birth to */ | |
| 950 zio_t *zio; | |
| 951 uint64_t used = 0, compressed = 0, uncompressed = 0; | |
| 952 struct killarg ka; | |
| 953 | |
| 954 zio = zio_root(tx->tx_pool->dp_spa, NULL, NULL, | |
| 955 ZIO_FLAG_MUSTSUCCEED); | |
| 956 ka.usedp = &used; | |
| 957 ka.compressedp = &compressed; | |
| 958 ka.uncompressedp = &uncompressed; | |
| 959 ka.zio = zio; | |
| 960 ka.tx = tx; | |
| 961 (void) traverse_dsl_dataset(ds, ds->ds_phys->ds_prev_snap_txg, | |
| 962 ADVANCE_POST, kill_blkptr, &ka); | |
| 963 (void) zio_wait(zio); | |
| 964 | |
| 2199 | 965 dsl_dir_diduse_space(ds->ds_dir, |
| 789 | 966 -used, -compressed, -uncompressed, tx); |
| 967 } | |
| 968 | |
| 2199 | 969 /* Change our contents to that of the prev snapshot */ |
| 789 | 970 ASSERT3U(ds->ds_prev->ds_object, ==, ds->ds_phys->ds_prev_snap_obj); |
| 971 ds->ds_phys->ds_bp = ds->ds_prev->ds_phys->ds_bp; | |
| 972 ds->ds_phys->ds_used_bytes = ds->ds_prev->ds_phys->ds_used_bytes; | |
| 973 ds->ds_phys->ds_compressed_bytes = | |
| 974 ds->ds_prev->ds_phys->ds_compressed_bytes; | |
| 975 ds->ds_phys->ds_uncompressed_bytes = | |
| 976 ds->ds_prev->ds_phys->ds_uncompressed_bytes; | |
| 2082 | 977 ds->ds_phys->ds_flags = ds->ds_prev->ds_phys->ds_flags; |
| 789 | 978 ds->ds_phys->ds_unique_bytes = 0; |
| 979 | |
|
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980 if (ds->ds_prev->ds_phys->ds_next_snap_obj == ds->ds_object) { |
|
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981 dmu_buf_will_dirty(ds->ds_prev->ds_dbuf, tx); |
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982 ds->ds_prev->ds_phys->ds_unique_bytes = 0; |
|
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983 } |
| 789 | 984 } |
| 985 | |
|
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986 /* ARGSUSED */ |
|
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987 static int |
| 2199 | 988 dsl_dataset_destroy_begin_check(void *arg1, void *arg2, dmu_tx_t *tx) |
|
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989 { |
| 2199 | 990 dsl_dataset_t *ds = arg1; |
|
1731
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991 |
|
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992 /* |
|
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993 * Can't delete a head dataset if there are snapshots of it. |
|
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994 * (Except if the only snapshots are from the branch we cloned |
|
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995 * from.) |
|
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996 */ |
|
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997 if (ds->ds_prev != NULL && |
|
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998 ds->ds_prev->ds_phys->ds_next_snap_obj == ds->ds_object) |
|
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999 return (EINVAL); |
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1000 |
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1001 return (0); |
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1002 } |
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1003 |
| 2199 | 1004 /* ARGSUSED */ |
| 1005 static void | |
| 1006 dsl_dataset_destroy_begin_sync(void *arg1, void *arg2, dmu_tx_t *tx) | |
| 789 | 1007 { |
| 2199 | 1008 dsl_dataset_t *ds = arg1; |
| 789 | 1009 |
| 2199 | 1010 /* Mark it as inconsistent on-disk, in case we crash */ |
| 1011 dmu_buf_will_dirty(ds->ds_dbuf, tx); | |
| 1012 ds->ds_phys->ds_flags |= DS_FLAG_INCONSISTENT; | |
| 1013 } | |
| 789 | 1014 |
| 2199 | 1015 /* ARGSUSED */ |
| 1016 static int | |
| 1017 dsl_dataset_destroy_check(void *arg1, void *arg2, dmu_tx_t *tx) | |
| 1018 { | |
| 1019 dsl_dataset_t *ds = arg1; | |
| 789 | 1020 |
| 1021 /* Can't delete a branch point. */ | |
| 2199 | 1022 if (ds->ds_phys->ds_num_children > 1) |
| 1023 return (EEXIST); | |
| 789 | 1024 |
| 1025 /* | |
| 1026 * Can't delete a head dataset if there are snapshots of it. | |
| 1027 * (Except if the only snapshots are from the branch we cloned | |
| 1028 * from.) | |
| 1029 */ | |
| 1030 if (ds->ds_prev != NULL && | |
| 2199 | 1031 ds->ds_prev->ds_phys->ds_next_snap_obj == ds->ds_object) |
| 789 | 1032 return (EINVAL); |
| 1033 | |
| 1034 /* | |
| 1035 * If we made changes this txg, traverse_dsl_dataset won't find | |
| 1036 * them. Try again. | |
| 1037 */ | |
| 2199 | 1038 if (ds->ds_phys->ds_bp.blk_birth >= tx->tx_txg) |
| 789 | 1039 return (EAGAIN); |
| 2199 | 1040 |
| 1041 /* XXX we should do some i/o error checking... */ | |
| 1042 return (0); | |
| 1043 } | |
| 1044 | |
| 1045 static void | |
| 1046 dsl_dataset_destroy_sync(void *arg1, void *tag, dmu_tx_t *tx) | |
| 1047 { | |
| 1048 dsl_dataset_t *ds = arg1; | |
| 1049 uint64_t used = 0, compressed = 0, uncompressed = 0; | |
| 1050 zio_t *zio; | |
| 1051 int err; | |
| 1052 int after_branch_point = FALSE; | |
| 1053 dsl_pool_t *dp = ds->ds_dir->dd_pool; | |
| 1054 objset_t *mos = dp->dp_meta_objset; | |
| 1055 dsl_dataset_t *ds_prev = NULL; | |
| 1056 uint64_t obj; | |
| 1057 | |
| 1058 ASSERT3U(ds->ds_open_refcount, ==, DOS_REF_MAX); | |
| 1059 ASSERT3U(ds->ds_phys->ds_num_children, <=, 1); | |
| 1060 ASSERT(ds->ds_prev == NULL || | |
| 1061 ds->ds_prev->ds_phys->ds_next_snap_obj != ds->ds_object); | |
| 1062 ASSERT3U(ds->ds_phys->ds_bp.blk_birth, <=, tx->tx_txg); | |
| 1063 | |
| 1064 ASSERT(RW_WRITE_HELD(&dp->dp_config_rwlock)); | |
| 1065 | |
| 1066 obj = ds->ds_object; | |
| 789 | 1067 |
| 1068 if (ds->ds_phys->ds_prev_snap_obj != 0) { | |
| 1069 if (ds->ds_prev) { | |
| 1070 ds_prev = ds->ds_prev; | |
| 1071 } else { | |
| 2199 | 1072 VERIFY(0 == dsl_dataset_open_obj(dp, |
| 789 | 1073 ds->ds_phys->ds_prev_snap_obj, NULL, |
| 2199 | 1074 DS_MODE_NONE, FTAG, &ds_prev)); |
| 789 | 1075 } |
| 1076 after_branch_point = | |
| 1077 (ds_prev->ds_phys->ds_next_snap_obj != obj); | |
| 1078 | |
| 1079 dmu_buf_will_dirty(ds_prev->ds_dbuf, tx); | |
| 1080 if (after_branch_point && | |
| 1081 ds->ds_phys->ds_next_snap_obj == 0) { | |
| 1082 /* This clone is toast. */ | |
| 1083 ASSERT(ds_prev->ds_phys->ds_num_children > 1); | |
| 1084 ds_prev->ds_phys->ds_num_children--; | |
| 1085 } else if (!after_branch_point) { | |
| 1086 ds_prev->ds_phys->ds_next_snap_obj = | |
| 1087 ds->ds_phys->ds_next_snap_obj; | |
| 1088 } | |
| 1089 } | |
| 1090 | |
| 1091 zio = zio_root(dp->dp_spa, NULL, NULL, ZIO_FLAG_MUSTSUCCEED); | |
| 1092 | |
| 1093 if (ds->ds_phys->ds_next_snap_obj != 0) { | |
| 2199 | 1094 blkptr_t bp; |
| 789 | 1095 dsl_dataset_t *ds_next; |
| 1096 uint64_t itor = 0; | |
| 1097 | |
| 1098 spa_scrub_restart(dp->dp_spa, tx->tx_txg); | |
| 1099 | |
| 2199 | 1100 VERIFY(0 == dsl_dataset_open_obj(dp, |
| 1544 | 1101 ds->ds_phys->ds_next_snap_obj, NULL, |
| 1102 DS_MODE_NONE, FTAG, &ds_next)); | |
| 789 | 1103 ASSERT3U(ds_next->ds_phys->ds_prev_snap_obj, ==, obj); |
| 1104 | |
| 1105 dmu_buf_will_dirty(ds_next->ds_dbuf, tx); | |
| 1106 ds_next->ds_phys->ds_prev_snap_obj = | |
| 1107 ds->ds_phys->ds_prev_snap_obj; | |
| 1108 ds_next->ds_phys->ds_prev_snap_txg = | |
| 1109 ds->ds_phys->ds_prev_snap_txg; | |
| 1110 ASSERT3U(ds->ds_phys->ds_prev_snap_txg, ==, | |
| 1111 ds_prev ? ds_prev->ds_phys->ds_creation_txg : 0); | |
| 1112 | |
| 1113 /* | |
| 1114 * Transfer to our deadlist (which will become next's | |
| 1115 * new deadlist) any entries from next's current | |
| 1116 * deadlist which were born before prev, and free the | |
| 1117 * other entries. | |
| 1118 * | |
| 1119 * XXX we're doing this long task with the config lock held | |
| 1120 */ | |
| 1121 while (bplist_iterate(&ds_next->ds_deadlist, &itor, | |
| 1122 &bp) == 0) { | |
| 1123 if (bp.blk_birth <= ds->ds_phys->ds_prev_snap_txg) { | |
| 1544 | 1124 VERIFY(0 == bplist_enqueue(&ds->ds_deadlist, |
| 1125 &bp, tx)); | |
| 789 | 1126 if (ds_prev && !after_branch_point && |
| 1127 bp.blk_birth > | |
| 1128 ds_prev->ds_phys->ds_prev_snap_txg) { | |
| 1129 ds_prev->ds_phys->ds_unique_bytes += | |
| 2082 | 1130 bp_get_dasize(dp->dp_spa, &bp); |
| 789 | 1131 } |
| 1132 } else { | |
| 2082 | 1133 used += bp_get_dasize(dp->dp_spa, &bp); |
| 789 | 1134 compressed += BP_GET_PSIZE(&bp); |
| 1135 uncompressed += BP_GET_UCSIZE(&bp); | |
| 1136 /* XXX check return value? */ | |
| 1137 (void) arc_free(zio, dp->dp_spa, tx->tx_txg, | |
| 1138 &bp, NULL, NULL, ARC_NOWAIT); | |
| 1139 } | |
| 1140 } | |
| 1141 | |
| 1142 /* free next's deadlist */ | |
| 1143 bplist_close(&ds_next->ds_deadlist); | |
| 1144 bplist_destroy(mos, ds_next->ds_phys->ds_deadlist_obj, tx); | |
| 1145 | |
| 1146 /* set next's deadlist to our deadlist */ | |
| 1147 ds_next->ds_phys->ds_deadlist_obj = | |
| 1148 ds->ds_phys->ds_deadlist_obj; | |
| 1544 | 1149 VERIFY(0 == bplist_open(&ds_next->ds_deadlist, mos, |
| 1150 ds_next->ds_phys->ds_deadlist_obj)); | |
| 789 | 1151 ds->ds_phys->ds_deadlist_obj = 0; |
| 1152 | |
| 1153 if (ds_next->ds_phys->ds_next_snap_obj != 0) { | |
| 1154 /* | |
| 1155 * Update next's unique to include blocks which | |
| 1156 * were previously shared by only this snapshot | |
| 1157 * and it. Those blocks will be born after the | |
| 1158 * prev snap and before this snap, and will have | |
| 1159 * died after the next snap and before the one | |
| 1160 * after that (ie. be on the snap after next's | |
| 1161 * deadlist). | |
| 1162 * | |
| 1163 * XXX we're doing this long task with the | |
| 1164 * config lock held | |
| 1165 */ | |
| 1166 dsl_dataset_t *ds_after_next; | |
| 1167 | |
| 2199 | 1168 VERIFY(0 == dsl_dataset_open_obj(dp, |
| 789 | 1169 ds_next->ds_phys->ds_next_snap_obj, NULL, |
| 1544 | 1170 DS_MODE_NONE, FTAG, &ds_after_next)); |
| 789 | 1171 itor = 0; |
| 1172 while (bplist_iterate(&ds_after_next->ds_deadlist, | |
| 1173 &itor, &bp) == 0) { | |
| 1174 if (bp.blk_birth > | |
| 1175 ds->ds_phys->ds_prev_snap_txg && | |
| 1176 bp.blk_birth <= | |
| 1177 ds->ds_phys->ds_creation_txg) { | |
| 1178 ds_next->ds_phys->ds_unique_bytes += | |
| 2082 | 1179 bp_get_dasize(dp->dp_spa, &bp); |
| 789 | 1180 } |
| 1181 } | |
| 1182 | |
| 1183 dsl_dataset_close(ds_after_next, DS_MODE_NONE, FTAG); | |
| 1184 ASSERT3P(ds_next->ds_prev, ==, NULL); | |
| 1185 } else { | |
| 1186 /* | |
| 1187 * It would be nice to update the head dataset's | |
| 1188 * unique. To do so we would have to traverse | |
| 1189 * it for blocks born after ds_prev, which is | |
| 1190 * pretty expensive just to maintain something | |
| 1191 * for debugging purposes. | |
| 1192 */ | |
| 1193 ASSERT3P(ds_next->ds_prev, ==, ds); | |
| 1194 dsl_dataset_close(ds_next->ds_prev, DS_MODE_NONE, | |
| 1195 ds_next); | |
| 1196 if (ds_prev) { | |
| 2199 | 1197 VERIFY(0 == dsl_dataset_open_obj(dp, |
| 1544 | 1198 ds->ds_phys->ds_prev_snap_obj, NULL, |
| 1199 DS_MODE_NONE, ds_next, &ds_next->ds_prev)); | |
| 789 | 1200 } else { |
| 1201 ds_next->ds_prev = NULL; | |
| 1202 } | |
| 1203 } | |
| 1204 dsl_dataset_close(ds_next, DS_MODE_NONE, FTAG); | |
| 1205 | |
| 1206 /* | |
| 1207 * NB: unique_bytes is not accurate for head objsets | |
| 1208 * because we don't update it when we delete the most | |
| 1209 * recent snapshot -- see above comment. | |
| 1210 */ | |
| 1211 ASSERT3U(used, ==, ds->ds_phys->ds_unique_bytes); | |
| 1212 } else { | |
| 1213 /* | |
| 1214 * There's no next snapshot, so this is a head dataset. | |
| 1215 * Destroy the deadlist. Unless it's a clone, the | |
| 1216 * deadlist should be empty. (If it's a clone, it's | |
| 1217 * safe to ignore the deadlist contents.) | |
| 1218 */ | |
| 1219 struct killarg ka; | |
| 1220 | |
| 1221 ASSERT(after_branch_point || bplist_empty(&ds->ds_deadlist)); | |
| 1222 bplist_close(&ds->ds_deadlist); | |
| 1223 bplist_destroy(mos, ds->ds_phys->ds_deadlist_obj, tx); | |
| 1224 ds->ds_phys->ds_deadlist_obj = 0; | |
| 1225 | |
| 1226 /* | |
| 1227 * Free everything that we point to (that's born after | |
| 1228 * the previous snapshot, if we are a clone) | |
| 1229 * | |
| 1230 * XXX we're doing this long task with the config lock held | |
| 1231 */ | |
| 1232 ka.usedp = &used; | |
| 1233 ka.compressedp = &compressed; | |
| 1234 ka.uncompressedp = &uncompressed; | |
| 1235 ka.zio = zio; | |
| 1236 ka.tx = tx; | |
| 1237 err = traverse_dsl_dataset(ds, ds->ds_phys->ds_prev_snap_txg, | |
| 1238 ADVANCE_POST, kill_blkptr, &ka); | |
| 1239 ASSERT3U(err, ==, 0); | |
| 1240 } | |
| 1241 | |
| 1242 err = zio_wait(zio); | |
| 1243 ASSERT3U(err, ==, 0); | |
| 1244 | |
| 2199 | 1245 dsl_dir_diduse_space(ds->ds_dir, -used, -compressed, -uncompressed, tx); |
| 789 | 1246 |
| 1247 if (ds->ds_phys->ds_snapnames_zapobj) { | |
| 1248 err = zap_destroy(mos, ds->ds_phys->ds_snapnames_zapobj, tx); | |
| 1249 ASSERT(err == 0); | |
| 1250 } | |
| 1251 | |
| 2199 | 1252 if (ds->ds_dir->dd_phys->dd_head_dataset_obj == ds->ds_object) { |
| 789 | 1253 /* Erase the link in the dataset */ |
| 2199 | 1254 dmu_buf_will_dirty(ds->ds_dir->dd_dbuf, tx); |
| 1255 ds->ds_dir->dd_phys->dd_head_dataset_obj = 0; | |
| 789 | 1256 /* |
| 1257 * dsl_dir_sync_destroy() called us, they'll destroy | |
| 1258 * the dataset. | |
| 1259 */ | |
| 1260 } else { | |
| 1261 /* remove from snapshot namespace */ | |
| 1262 dsl_dataset_t *ds_head; | |
| 2199 | 1263 VERIFY(0 == dsl_dataset_open_obj(dp, |
| 1264 ds->ds_dir->dd_phys->dd_head_dataset_obj, NULL, | |
| 1544 | 1265 DS_MODE_NONE, FTAG, &ds_head)); |
|
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1266 VERIFY(0 == dsl_dataset_get_snapname(ds)); |
| 789 | 1267 #ifdef ZFS_DEBUG |
| 1268 { | |
| 1269 uint64_t val; | |
| 1270 err = zap_lookup(mos, | |
| 1271 ds_head->ds_phys->ds_snapnames_zapobj, | |
| 2199 | 1272 ds->ds_snapname, 8, 1, &val); |
| 789 | 1273 ASSERT3U(err, ==, 0); |
| 1274 ASSERT3U(val, ==, obj); | |
| 1275 } | |
| 1276 #endif | |
| 1277 err = zap_remove(mos, ds_head->ds_phys->ds_snapnames_zapobj, | |
| 2199 | 1278 ds->ds_snapname, tx); |
| 789 | 1279 ASSERT(err == 0); |
| 1280 dsl_dataset_close(ds_head, DS_MODE_NONE, FTAG); | |
| 1281 } | |
| 1282 | |
| 1283 if (ds_prev && ds->ds_prev != ds_prev) | |
| 1284 dsl_dataset_close(ds_prev, DS_MODE_NONE, FTAG); | |
| 1285 | |
| 2199 | 1286 dsl_dataset_close(ds, DS_MODE_EXCLUSIVE, tag); |
| 1287 VERIFY(0 == dmu_object_free(mos, obj, tx)); | |
| 1288 } | |
| 1289 | |
| 1290 /* ARGSUSED */ | |
| 1291 int | |
| 1292 dsl_dataset_snapshot_check(void *arg1, void *arg2, dmu_tx_t *tx) | |
| 1293 { | |
| 1294 objset_t *os = arg1; | |
| 1295 dsl_dataset_t *ds = os->os->os_dsl_dataset; | |
| 1296 const char *snapname = arg2; | |
| 1297 objset_t *mos = ds->ds_dir->dd_pool->dp_meta_objset; | |
| 1298 int err; | |
| 1299 uint64_t value; | |
| 789 | 1300 |
| 1301 /* | |
| 2199 | 1302 * We don't allow multiple snapshots of the same txg. If there |
| 1303 * is already one, try again. | |
| 1304 */ | |
| 1305 if (ds->ds_phys->ds_prev_snap_txg >= tx->tx_txg) | |
| 1306 return (EAGAIN); | |
| 1307 | |
| 1308 /* | |
| 1309 * Check for conflicting name snapshot name. | |
| 789 | 1310 */ |
| 2199 | 1311 err = zap_lookup(mos, ds->ds_phys->ds_snapnames_zapobj, |
| 1312 snapname, 8, 1, &value); | |
| 1313 if (err == 0) | |
| 1314 return (EEXIST); | |
| 1315 if (err != ENOENT) | |
| 1316 return (err); | |
| 789 | 1317 |
| 2199 | 1318 ds->ds_trysnap_txg = tx->tx_txg; |
| 789 | 1319 return (0); |
| 1320 } | |
| 1321 | |
| 2199 | 1322 void |
| 1323 dsl_dataset_snapshot_sync(void *arg1, void *arg2, dmu_tx_t *tx) | |
| 789 | 1324 { |
| 2199 | 1325 objset_t *os = arg1; |
| 1326 dsl_dataset_t *ds = os->os->os_dsl_dataset; | |
| 1327 const char *snapname = arg2; | |
| 1328 dsl_pool_t *dp = ds->ds_dir->dd_pool; | |
| 789 | 1329 dmu_buf_t *dbuf; |
| 1330 dsl_dataset_phys_t *dsphys; | |
| 2199 | 1331 uint64_t dsobj; |
| 789 | 1332 objset_t *mos = dp->dp_meta_objset; |
| 1333 int err; | |
| 1334 | |
| 1335 spa_scrub_restart(dp->dp_spa, tx->tx_txg); | |
| 2199 | 1336 ASSERT(RW_WRITE_HELD(&dp->dp_config_rwlock)); |
| 789 | 1337 |
|
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1338 dsobj = dmu_object_alloc(mos, DMU_OT_DSL_DATASET, 0, |
|
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1339 DMU_OT_DSL_DATASET, sizeof (dsl_dataset_phys_t), tx); |
| 1544 | 1340 VERIFY(0 == dmu_bonus_hold(mos, dsobj, FTAG, &dbuf)); |
| 789 | 1341 dmu_buf_will_dirty(dbuf, tx); |
| 1342 dsphys = dbuf->db_data; | |
| 2199 | 1343 dsphys->ds_dir_obj = ds->ds_dir->dd_object; |
| 789 | 1344 dsphys->ds_fsid_guid = unique_create(); |
| 1345 unique_remove(dsphys->ds_fsid_guid); /* it isn't open yet */ | |
| 1346 (void) random_get_pseudo_bytes((void*)&dsphys->ds_guid, | |
| 1347 sizeof (dsphys->ds_guid)); | |
| 1348 dsphys->ds_prev_snap_obj = ds->ds_phys->ds_prev_snap_obj; | |
| 1349 dsphys->ds_prev_snap_txg = ds->ds_phys->ds_prev_snap_txg; | |
| 1350 dsphys->ds_next_snap_obj = ds->ds_object; | |
| 1351 dsphys->ds_num_children = 1; | |
| 1352 dsphys->ds_creation_time = gethrestime_sec(); | |
| 1353 dsphys->ds_creation_txg = tx->tx_txg; | |
| 1354 dsphys->ds_deadlist_obj = ds->ds_phys->ds_deadlist_obj; | |
| 1355 dsphys->ds_used_bytes = ds->ds_phys->ds_used_bytes; | |
| 1356 dsphys->ds_compressed_bytes = ds->ds_phys->ds_compressed_bytes; | |
| 1357 dsphys->ds_uncompressed_bytes = ds->ds_phys->ds_uncompressed_bytes; | |
| 2082 | 1358 dsphys->ds_flags = ds->ds_phys->ds_flags; |
| 789 | 1359 dsphys->ds_bp = ds->ds_phys->ds_bp; |
| 1544 | 1360 dmu_buf_rele(dbuf, FTAG); |
| 789 | 1361 |
| 2199 | 1362 ASSERT3U(ds->ds_prev != 0, ==, ds->ds_phys->ds_prev_snap_obj != 0); |
| 1363 if (ds->ds_prev) { | |
| 1364 ASSERT(ds->ds_prev->ds_phys->ds_next_snap_obj == | |
| 789 | 1365 ds->ds_object || |
| 2199 | 1366 ds->ds_prev->ds_phys->ds_num_children > 1); |
| 1367 if (ds->ds_prev->ds_phys->ds_next_snap_obj == ds->ds_object) { | |
| 1368 dmu_buf_will_dirty(ds->ds_prev->ds_dbuf, tx); | |
| 789 | 1369 ASSERT3U(ds->ds_phys->ds_prev_snap_txg, ==, |
| 2199 | 1370 ds->ds_prev->ds_phys->ds_creation_txg); |
| 1371 ds->ds_prev->ds_phys->ds_next_snap_obj = dsobj; | |
| 789 | 1372 } |
| 1373 } | |
| 1374 | |
| 1375 bplist_close(&ds->ds_deadlist); | |
| 1376 dmu_buf_will_dirty(ds->ds_dbuf, tx); | |
| 1377 ASSERT3U(ds->ds_phys->ds_prev_snap_txg, <, dsphys->ds_creation_txg); | |
| 1378 ds->ds_phys->ds_prev_snap_obj = dsobj; | |
| 1379 ds->ds_phys->ds_prev_snap_txg = dsphys->ds_creation_txg; | |
| 1380 ds->ds_phys->ds_unique_bytes = 0; | |
| 1381 ds->ds_phys->ds_deadlist_obj = | |
| 1382 bplist_create(mos, DSL_DEADLIST_BLOCKSIZE, tx); | |
| 1544 | 1383 VERIFY(0 == bplist_open(&ds->ds_deadlist, mos, |
| 1384 ds->ds_phys->ds_deadlist_obj)); | |
| 789 | 1385 |
| 1386 dprintf("snap '%s' -> obj %llu\n", snapname, dsobj); | |
| 1387 err = zap_add(mos, ds->ds_phys->ds_snapnames_zapobj, | |
| 1388 snapname, 8, 1, &dsobj, tx); | |
| 1389 ASSERT(err == 0); | |
| 1390 | |
| 1391 if (ds->ds_prev) | |
| 1392 dsl_dataset_close(ds->ds_prev, DS_MODE_NONE, ds); | |
| 1544 | 1393 VERIFY(0 == dsl_dataset_open_obj(dp, |
| 1394 ds->ds_phys->ds_prev_snap_obj, snapname, | |
| 1395 DS_MODE_NONE, ds, &ds->ds_prev)); | |
| 789 | 1396 } |
| 1397 | |
| 1398 void | |
| 1399 dsl_dataset_sync(dsl_dataset_t *ds, dmu_tx_t *tx) | |
| 1400 { | |
| 1401 ASSERT(dmu_tx_is_syncing(tx)); | |
| 1402 ASSERT(ds->ds_user_ptr != NULL); | |
| 1403 ASSERT(ds->ds_phys->ds_next_snap_obj == 0); | |
| 1404 | |
| 1405 dmu_objset_sync(ds->ds_user_ptr, tx); | |
| 1406 dsl_dir_dirty(ds->ds_dir, tx); | |
| 1407 bplist_close(&ds->ds_deadlist); | |
| 1408 | |
| 1544 | 1409 dmu_buf_rele(ds->ds_dbuf, ds); |
| 789 | 1410 } |
| 1411 | |
| 1412 void | |
| 1413 dsl_dataset_stats(dsl_dataset_t *ds, dmu_objset_stats_t *dds) | |
| 1414 { | |
| 1415 /* fill in properties crap */ | |
| 1416 dsl_dir_stats(ds->ds_dir, dds); | |
| 1417 | |
| 1418 if (ds->ds_phys->ds_num_children != 0) { | |
| 1419 dds->dds_is_snapshot = TRUE; | |
| 1420 dds->dds_num_clones = ds->ds_phys->ds_num_children - 1; | |
| 1421 } | |
| 1422 | |
| 2082 | 1423 dds->dds_inconsistent = ds->ds_phys->ds_flags & DS_FLAG_INCONSISTENT; |
| 789 | 1424 dds->dds_last_txg = ds->ds_phys->ds_bp.blk_birth; |
| 1425 | |
| 1426 dds->dds_objects_used = ds->ds_phys->ds_bp.blk_fill; | |
| 1427 dds->dds_objects_avail = DN_MAX_OBJECT - dds->dds_objects_used; | |
| 1428 | |
| 1429 /* We override the dataset's creation time... they should be the same */ | |
| 1430 dds->dds_creation_time = ds->ds_phys->ds_creation_time; | |
| 1431 dds->dds_creation_txg = ds->ds_phys->ds_creation_txg; | |
| 1432 dds->dds_space_refd = ds->ds_phys->ds_used_bytes; | |
| 1433 dds->dds_fsid_guid = ds->ds_phys->ds_fsid_guid; | |
| 1434 | |
| 1435 if (ds->ds_phys->ds_next_snap_obj) { | |
| 1436 /* | |
| 1437 * This is a snapshot; override the dd's space used with | |
| 1438 * our unique space | |
| 1439 */ | |
| 1440 dds->dds_space_used = ds->ds_phys->ds_unique_bytes; | |
| 1441 dds->dds_compressed_bytes = | |
| 1442 ds->ds_phys->ds_compressed_bytes; | |
| 1443 dds->dds_uncompressed_bytes = | |
| 1444 ds->ds_phys->ds_uncompressed_bytes; | |
| 1445 } | |
| 1446 } | |
| 1447 | |
| 1448 dsl_pool_t * | |
| 1449 dsl_dataset_pool(dsl_dataset_t *ds) | |
| 1450 { | |
| 1451 return (ds->ds_dir->dd_pool); | |
| 1452 } | |
| 1453 | |
| 2199 | 1454 /* ARGSUSED */ |
| 789 | 1455 static int |
| 2199 | 1456 dsl_dataset_snapshot_rename_check(void *arg1, void *arg2, dmu_tx_t *tx) |
| 789 | 1457 { |
| 2199 | 1458 dsl_dataset_t *ds = arg1; |
| 1459 char *newsnapname = arg2; | |
| 1460 dsl_dir_t *dd = ds->ds_dir; | |
| 789 | 1461 objset_t *mos = dd->dd_pool->dp_meta_objset; |
| 2199 | 1462 dsl_dataset_t *hds; |
| 1463 uint64_t val; | |
| 789 | 1464 int err; |
| 1465 | |
| 2199 | 1466 err = dsl_dataset_open_obj(dd->dd_pool, |
| 1467 dd->dd_phys->dd_head_dataset_obj, NULL, DS_MODE_NONE, FTAG, &hds); | |
| 789 | 1468 if (err) |
| 1469 return (err); | |
| 1470 | |
| 2199 | 1471 /* new name better not be in use */ |
| 1472 err = zap_lookup(mos, hds->ds_phys->ds_snapnames_zapobj, | |
| 1473 newsnapname, 8, 1, &val); | |
| 1474 dsl_dataset_close(hds, DS_MODE_NONE, FTAG); | |
| 789 | 1475 |
| 2199 | 1476 if (err == 0) |
| 1477 err = EEXIST; | |
| 1478 else if (err == ENOENT) | |
| 1479 err = 0; | |
| 1480 return (err); | |
| 1481 } | |
| 789 | 1482 |
| 2199 | 1483 static void |
| 1484 dsl_dataset_snapshot_rename_sync(void *arg1, void *arg2, dmu_tx_t *tx) | |
| 1485 { | |
| 1486 dsl_dataset_t *ds = arg1; | |
| 1487 char *newsnapname = arg2; | |
| 1488 dsl_dir_t *dd = ds->ds_dir; | |
| 1489 objset_t *mos = dd->dd_pool->dp_meta_objset; | |
| 1490 dsl_dataset_t *hds; | |
| 1491 int err; | |
| 789 | 1492 |
| 2199 | 1493 ASSERT(ds->ds_phys->ds_next_snap_obj != 0); |
| 789 | 1494 |
| 2199 | 1495 VERIFY(0 == dsl_dataset_open_obj(dd->dd_pool, |
| 1496 dd->dd_phys->dd_head_dataset_obj, NULL, DS_MODE_NONE, FTAG, &hds)); | |
| 789 | 1497 |
| 2199 | 1498 VERIFY(0 == dsl_dataset_get_snapname(ds)); |
| 1499 err = zap_remove(mos, hds->ds_phys->ds_snapnames_zapobj, | |
| 1500 ds->ds_snapname, tx); | |
| 789 | 1501 ASSERT3U(err, ==, 0); |
| 2199 | 1502 mutex_enter(&ds->ds_lock); |
| 1503 (void) strcpy(ds->ds_snapname, newsnapname); | |
| 1504 mutex_exit(&ds->ds_lock); | |
| 1505 err = zap_add(mos, hds->ds_phys->ds_snapnames_zapobj, | |
| 1506 ds->ds_snapname, 8, 1, &ds->ds_object, tx); | |
| 789 | 1507 ASSERT3U(err, ==, 0); |
| 1508 | |
| 2199 | 1509 dsl_dataset_close(hds, DS_MODE_NONE, FTAG); |
| 789 | 1510 } |
| 1511 | |
| 1512 #pragma weak dmu_objset_rename = dsl_dataset_rename | |
| 1513 int | |
| 2199 | 1514 dsl_dataset_rename(const char *oldname, const char *newname) |
| 789 | 1515 { |
| 1516 dsl_dir_t *dd; | |
| 2199 | 1517 dsl_dataset_t *ds; |
| 789 | 1518 const char *tail; |
| 1519 int err; | |
| 1520 | |
| 2199 | 1521 err = dsl_dir_open(oldname, FTAG, &dd, &tail); |
| 1544 | 1522 if (err) |
| 1523 return (err); | |
| 789 | 1524 if (tail == NULL) { |
| 2199 | 1525 err = dsl_dir_rename(dd, newname); |
| 789 | 1526 dsl_dir_close(dd, FTAG); |
| 1527 return (err); | |
| 1528 } | |
| 1529 if (tail[0] != '@') { | |
| 1530 /* the name ended in a nonexistant component */ | |
| 1531 dsl_dir_close(dd, FTAG); | |
| 1532 return (ENOENT); | |
| 1533 } | |
| 1534 | |
| 2199 | 1535 dsl_dir_close(dd, FTAG); |
| 1536 | |
| 1537 /* new name must be snapshot in same filesystem */ | |
| 1538 tail = strchr(newname, '@'); | |
| 1539 if (tail == NULL) | |
| 1540 return (EINVAL); | |
| 1541 tail++; | |
| 1542 if (strncmp(oldname, newname, tail - newname) != 0) | |
| 1543 return (EXDEV); | |
| 789 | 1544 |
| 2199 | 1545 err = dsl_dataset_open(oldname, |
| 1546 DS_MODE_READONLY | DS_MODE_STANDARD, FTAG, &ds); | |
| 1547 if (err) | |
| 1548 return (err); | |
| 1549 | |
| 1550 err = dsl_sync_task_do(ds->ds_dir->dd_pool, | |
| 1551 dsl_dataset_snapshot_rename_check, | |
| 1552 dsl_dataset_snapshot_rename_sync, ds, (char *)tail, 1); | |
| 1553 | |
| 1554 dsl_dataset_close(ds, DS_MODE_STANDARD, FTAG); | |
| 1555 | |
| 789 | 1556 return (err); |
| 1557 } | |
| 2082 | 1558 |
| 2199 | 1559 struct promotearg { |
| 1560 uint64_t used, comp, uncomp, unique; | |
| 1561 uint64_t newnext_obj, snapnames_obj; | |
| 1562 }; | |
| 1563 | |
| 2082 | 1564 static int |
| 2199 | 1565 dsl_dataset_promote_check(void *arg1, void *arg2, dmu_tx_t *tx) |
| 2082 | 1566 { |
| 2199 | 1567 dsl_dataset_t *hds = arg1; |
| 1568 struct promotearg *pa = arg2; | |
| 1569 dsl_dir_t *dd = hds->ds_dir; | |
| 1570 dsl_pool_t *dp = hds->ds_dir->dd_pool; | |
| 2082 | 1571 dsl_dir_t *pdd = NULL; |
| 1572 dsl_dataset_t *ds = NULL; | |
| 1573 dsl_dataset_t *pivot_ds = NULL; | |
| 1574 dsl_dataset_t *newnext_ds = NULL; | |
| 1575 int err; | |
| 1576 char *name = NULL; | |
| 2199 | 1577 uint64_t itor = 0; |
| 2082 | 1578 blkptr_t bp; |
| 1579 | |
| 2199 | 1580 bzero(pa, sizeof (*pa)); |
| 1581 | |
| 2082 | 1582 /* Check that it is a clone */ |
| 1583 if (dd->dd_phys->dd_clone_parent_obj == 0) | |
| 1584 return (EINVAL); | |
| 1585 | |
| 2199 | 1586 /* Since this is so expensive, don't do the preliminary check */ |
| 1587 if (!dmu_tx_is_syncing(tx)) | |
| 1588 return (0); | |
| 1589 | |
| 1590 if (err = dsl_dataset_open_obj(dp, | |
| 2082 | 1591 dd->dd_phys->dd_clone_parent_obj, |
| 1592 NULL, DS_MODE_EXCLUSIVE, FTAG, &pivot_ds)) | |
| 1593 goto out; | |
| 1594 pdd = pivot_ds->ds_dir; | |
| 2199 | 1595 |
| 1596 { | |
| 1597 dsl_dataset_t *phds; | |
| 1598 if (err = dsl_dataset_open_obj(dd->dd_pool, | |
| 1599 pdd->dd_phys->dd_head_dataset_obj, | |
| 1600 NULL, DS_MODE_NONE, FTAG, &phds)) | |
| 1601 goto out; | |
| 1602 pa->snapnames_obj = phds->ds_phys->ds_snapnames_zapobj; | |
| 1603 dsl_dataset_close(phds, DS_MODE_NONE, FTAG); | |
| 1604 } | |
| 2082 | 1605 |
| 1606 if (hds->ds_phys->ds_flags & DS_FLAG_NOPROMOTE) { | |
| 1607 err = EXDEV; | |
| 1608 goto out; | |
| 1609 } | |
| 1610 | |
| 1611 /* find pivot point's new next ds */ | |
| 1612 VERIFY(0 == dsl_dataset_open_obj(dd->dd_pool, hds->ds_object, | |
| 1613 NULL, DS_MODE_NONE, FTAG, &newnext_ds)); | |
| 1614 while (newnext_ds->ds_phys->ds_prev_snap_obj != pivot_ds->ds_object) { | |
| 1615 dsl_dataset_t *prev; | |
| 1616 | |
| 1617 if (err = dsl_dataset_open_obj(dd->dd_pool, | |
| 2199 | 1618 newnext_ds->ds_phys->ds_prev_snap_obj, |
| 1619 NULL, DS_MODE_NONE, FTAG, &prev)) | |
| 2082 | 1620 goto out; |
| 1621 dsl_dataset_close(newnext_ds, DS_MODE_NONE, FTAG); | |
| 1622 newnext_ds = prev; | |
| 1623 } | |
| 2199 | 1624 pa->newnext_obj = newnext_ds->ds_object; |
| 2082 | 1625 |
| 1626 /* compute pivot point's new unique space */ | |
| 1627 while ((err = bplist_iterate(&newnext_ds->ds_deadlist, | |
| 1628 &itor, &bp)) == 0) { | |
| 1629 if (bp.blk_birth > pivot_ds->ds_phys->ds_prev_snap_txg) | |
| 2199 | 1630 pa->unique += bp_get_dasize(dd->dd_pool->dp_spa, &bp); |
| 2082 | 1631 } |
| 1632 if (err != ENOENT) | |
| 1633 goto out; | |
| 1634 | |
| 1635 /* Walk the snapshots that we are moving */ | |
| 1636 name = kmem_alloc(MAXPATHLEN, KM_SLEEP); | |
| 1637 ds = pivot_ds; | |
| 1638 /* CONSTCOND */ | |
| 1639 while (TRUE) { | |
| 1640 uint64_t val, dlused, dlcomp, dluncomp; | |
| 1641 dsl_dataset_t *prev; | |
| 1642 | |
| 1643 /* Check that the snapshot name does not conflict */ | |
| 1644 dsl_dataset_name(ds, name); | |
| 1645 err = zap_lookup(dd->dd_pool->dp_meta_objset, | |
| 1646 hds->ds_phys->ds_snapnames_zapobj, ds->ds_snapname, | |
| 1647 8, 1, &val); | |
| 1648 if (err != ENOENT) { | |
| 1649 if (err == 0) | |
| 1650 err = EEXIST; | |
| 1651 goto out; | |
| 1652 } | |
| 1653 | |
| 1654 /* | |
| 1655 * compute space to transfer. Each snapshot gave birth to: | |
| 1656 * (my used) - (prev's used) + (deadlist's used) | |
| 1657 */ | |
| 2199 | 1658 pa->used += ds->ds_phys->ds_used_bytes; |
| 1659 pa->comp += ds->ds_phys->ds_compressed_bytes; | |
| 1660 pa->uncomp += ds->ds_phys->ds_uncompressed_bytes; | |
| 2082 | 1661 |
| 1662 /* If we reach the first snapshot, we're done. */ | |
| 1663 if (ds->ds_phys->ds_prev_snap_obj == 0) | |
| 1664 break; | |
| 1665 | |
| 1666 if (err = bplist_space(&ds->ds_deadlist, | |
| 1667 &dlused, &dlcomp, &dluncomp)) | |
| 1668 goto out; | |
| 1669 if (err = dsl_dataset_open_obj(dd->dd_pool, | |
| 1670 ds->ds_phys->ds_prev_snap_obj, NULL, DS_MODE_EXCLUSIVE, | |
| 1671 FTAG, &prev)) | |
| 1672 goto out; | |
| 2199 | 1673 pa->used += dlused - prev->ds_phys->ds_used_bytes; |
| 1674 pa->comp += dlcomp - prev->ds_phys->ds_compressed_bytes; | |
| 1675 pa->uncomp += dluncomp - prev->ds_phys->ds_uncompressed_bytes; | |
| 2082 | 1676 |
| 1677 /* | |
| 1678 * We could be a clone of a clone. If we reach our | |
| 1679 * parent's branch point, we're done. | |
| 1680 */ | |
| 1681 if (prev->ds_phys->ds_next_snap_obj != ds->ds_object) { | |
| 1682 dsl_dataset_close(prev, DS_MODE_EXCLUSIVE, FTAG); | |
| 1683 break; | |
| 1684 } | |
| 1685 if (ds != pivot_ds) | |
| 1686 dsl_dataset_close(ds, DS_MODE_EXCLUSIVE, FTAG); | |
| 1687 ds = prev; | |
| 1688 } | |
| 1689 | |
| 1690 /* Check that there is enough space here */ | |
| 2199 | 1691 err = dsl_dir_transfer_possible(pdd, dd, pa->used); |
| 1692 | |
| 1693 out: | |
| 1694 if (ds && ds != pivot_ds) | |
| 1695 dsl_dataset_close(ds, DS_MODE_EXCLUSIVE, FTAG); | |
| 1696 if (pivot_ds) | |
| 1697 dsl_dataset_close(pivot_ds, DS_MODE_EXCLUSIVE, FTAG); | |
| 1698 if (newnext_ds) | |
| 1699 dsl_dataset_close(newnext_ds, DS_MODE_NONE, FTAG); | |
| 1700 if (name) | |
| 1701 kmem_free(name, MAXPATHLEN); | |
| 1702 return (err); | |
| 1703 } | |
| 2082 | 1704 |
| 2199 | 1705 static void |
| 1706 dsl_dataset_promote_sync(void *arg1, void *arg2, dmu_tx_t *tx) | |
| 1707 { | |
| 1708 dsl_dataset_t *hds = arg1; | |
| 1709 struct promotearg *pa = arg2; | |
| 1710 dsl_dir_t *dd = hds->ds_dir; | |
| 1711 dsl_pool_t *dp = hds->ds_dir->dd_pool; | |
| 1712 dsl_dir_t *pdd = NULL; | |
| 1713 dsl_dataset_t *ds, *pivot_ds; | |
| 1714 char *name; | |
| 1715 | |
| 1716 ASSERT(dd->dd_phys->dd_clone_parent_obj != 0); | |
| 1717 ASSERT(0 == (hds->ds_phys->ds_flags & DS_FLAG_NOPROMOTE)); | |
| 1718 | |
| 1719 VERIFY(0 == dsl_dataset_open_obj(dp, | |
| 1720 dd->dd_phys->dd_clone_parent_obj, | |
| 1721 NULL, DS_MODE_EXCLUSIVE, FTAG, &pivot_ds)); | |
| 2417 | 1722 /* |
| 1723 * We need to explicitly open pdd, since pivot_ds's pdd will be | |
| 1724 * changing. | |
| 1725 */ | |
| 1726 VERIFY(0 == dsl_dir_open_obj(dp, pivot_ds->ds_dir->dd_object, | |
| 1727 NULL, FTAG, &pdd)); | |
| 2082 | 1728 |
| 1729 /* move snapshots to this dir */ | |
| 2199 | 1730 name = kmem_alloc(MAXPATHLEN, KM_SLEEP); |
| 2082 | 1731 ds = pivot_ds; |
| 1732 /* CONSTCOND */ | |
| 1733 while (TRUE) { | |
| 1734 dsl_dataset_t *prev; | |
| 1735 | |
| 1736 /* move snap name entry */ | |
| 1737 dsl_dataset_name(ds, name); | |
| 2199 | 1738 VERIFY(0 == zap_remove(dp->dp_meta_objset, |
| 1739 pa->snapnames_obj, ds->ds_snapname, tx)); | |
| 1740 VERIFY(0 == zap_add(dp->dp_meta_objset, | |
| 2082 | 1741 hds->ds_phys->ds_snapnames_zapobj, ds->ds_snapname, |
| 1742 8, 1, &ds->ds_object, tx)); | |
| 1743 | |
| 1744 /* change containing dsl_dir */ | |
| 1745 dmu_buf_will_dirty(ds->ds_dbuf, tx); | |
| 1746 ASSERT3U(ds->ds_phys->ds_dir_obj, ==, pdd->dd_object); | |
| 1747 ds->ds_phys->ds_dir_obj = dd->dd_object; | |
| 1748 ASSERT3P(ds->ds_dir, ==, pdd); | |
| 1749 dsl_dir_close(ds->ds_dir, ds); | |
| 2199 | 1750 VERIFY(0 == dsl_dir_open_obj(dp, dd->dd_object, |
| 2082 | 1751 NULL, ds, &ds->ds_dir)); |
| 1752 | |
| 1753 ASSERT3U(dsl_prop_numcb(ds), ==, 0); | |
| 1754 | |
| 1755 if (ds->ds_phys->ds_prev_snap_obj == 0) | |
| 1756 break; | |
| 1757 | |
| 2199 | 1758 VERIFY(0 == dsl_dataset_open_obj(dp, |
| 2082 | 1759 ds->ds_phys->ds_prev_snap_obj, NULL, DS_MODE_EXCLUSIVE, |
| 1760 FTAG, &prev)); | |
| 1761 | |
| 1762 if (prev->ds_phys->ds_next_snap_obj != ds->ds_object) { | |
| 1763 dsl_dataset_close(prev, DS_MODE_EXCLUSIVE, FTAG); | |
| 1764 break; | |
| 1765 } | |
| 1766 if (ds != pivot_ds) | |
| 1767 dsl_dataset_close(ds, DS_MODE_EXCLUSIVE, FTAG); | |
| 1768 ds = prev; | |
| 1769 } | |
| 2199 | 1770 if (ds != pivot_ds) |
| 1771 dsl_dataset_close(ds, DS_MODE_EXCLUSIVE, FTAG); | |
| 2082 | 1772 |
| 1773 /* change pivot point's next snap */ | |
| 1774 dmu_buf_will_dirty(pivot_ds->ds_dbuf, tx); | |
| 2199 | 1775 pivot_ds->ds_phys->ds_next_snap_obj = pa->newnext_obj; |
| 2082 | 1776 |
| 1777 /* change clone_parent-age */ | |
| 1778 dmu_buf_will_dirty(dd->dd_dbuf, tx); | |
| 1779 ASSERT3U(dd->dd_phys->dd_clone_parent_obj, ==, pivot_ds->ds_object); | |
| 1780 dd->dd_phys->dd_clone_parent_obj = pdd->dd_phys->dd_clone_parent_obj; | |
| 1781 dmu_buf_will_dirty(pdd->dd_dbuf, tx); | |
| 1782 pdd->dd_phys->dd_clone_parent_obj = pivot_ds->ds_object; | |
| 1783 | |
| 1784 /* change space accounting */ | |
| 2199 | 1785 dsl_dir_diduse_space(pdd, -pa->used, -pa->comp, -pa->uncomp, tx); |
| 1786 dsl_dir_diduse_space(dd, pa->used, pa->comp, pa->uncomp, tx); | |
| 1787 pivot_ds->ds_phys->ds_unique_bytes = pa->unique; | |
| 2082 | 1788 |
| 2417 | 1789 dsl_dir_close(pdd, FTAG); |
| 2199 | 1790 dsl_dataset_close(pivot_ds, DS_MODE_EXCLUSIVE, FTAG); |
| 1791 kmem_free(name, MAXPATHLEN); | |
| 2082 | 1792 } |
| 1793 | |
| 1794 int | |
| 1795 dsl_dataset_promote(const char *name) | |
| 1796 { | |
| 1797 dsl_dataset_t *ds; | |
| 1798 int err; | |
| 1799 dmu_object_info_t doi; | |
| 2199 | 1800 struct promotearg pa; |
| 2082 | 1801 |
| 1802 err = dsl_dataset_open(name, DS_MODE_NONE, FTAG, &ds); | |
| 1803 if (err) | |
| 1804 return (err); | |
| 1805 | |
| 1806 err = dmu_object_info(ds->ds_dir->dd_pool->dp_meta_objset, | |
| 1807 ds->ds_phys->ds_snapnames_zapobj, &doi); | |
| 1808 if (err) { | |
| 1809 dsl_dataset_close(ds, DS_MODE_NONE, FTAG); | |
| 1810 return (err); | |
| 1811 } | |
| 1812 | |
| 1813 /* | |
| 1814 * Add in 128x the snapnames zapobj size, since we will be moving | |
| 1815 * a bunch of snapnames to the promoted ds, and dirtying their | |
| 1816 * bonus buffers. | |
| 1817 */ | |
| 2199 | 1818 err = dsl_sync_task_do(ds->ds_dir->dd_pool, |
| 1819 dsl_dataset_promote_check, | |
| 1820 dsl_dataset_promote_sync, ds, &pa, 2 + 2 * doi.doi_physical_blks); | |
| 2082 | 1821 dsl_dataset_close(ds, DS_MODE_NONE, FTAG); |
| 1822 return (err); | |
| 1823 } |