Mercurial > illumos > illumos-gate
annotate usr/src/uts/common/fs/zfs/dsl_dataset.c @ 3025:4e5ee8301d84
6424466 "panic: data after EOF" when unmounting abused pool
6484044 destroying a clone takes O(data)
| author | ahrens |
|---|---|
| date | Tue, 31 Oct 2006 19:07:59 -0800 |
| parents | c0259887ebbc |
| children | dc160a70a50d |
| 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 { |
| 2885 | 184 uint64_t trysnap = 0; |
| 185 | |
| 789 | 186 if (ds == NULL) |
| 1544 | 187 return (0); |
| 789 | 188 /* |
| 189 * The snapshot creation could fail, but that would cause an | |
| 190 * incorrect FALSE return, which would only result in an | |
| 191 * overestimation of the amount of space that an operation would | |
| 192 * consume, which is OK. | |
| 193 * | |
| 194 * There's also a small window where we could miss a pending | |
| 195 * snapshot, because we could set the sync task in the quiescing | |
| 196 * phase. So this should only be used as a guess. | |
| 197 */ | |
| 2885 | 198 if (ds->ds_trysnap_txg > |
| 199 spa_last_synced_txg(ds->ds_dir->dd_pool->dp_spa)) | |
| 200 trysnap = ds->ds_trysnap_txg; | |
| 201 return (MAX(ds->ds_phys->ds_prev_snap_txg, trysnap)); | |
| 1544 | 202 } |
| 203 | |
| 204 int | |
| 205 dsl_dataset_block_freeable(dsl_dataset_t *ds, uint64_t blk_birth) | |
| 206 { | |
| 207 return (blk_birth > dsl_dataset_prev_snap_txg(ds)); | |
| 789 | 208 } |
| 209 | |
| 210 /* ARGSUSED */ | |
| 211 static void | |
| 212 dsl_dataset_evict(dmu_buf_t *db, void *dsv) | |
| 213 { | |
| 214 dsl_dataset_t *ds = dsv; | |
| 215 dsl_pool_t *dp = ds->ds_dir->dd_pool; | |
| 216 | |
| 217 /* open_refcount == DOS_REF_MAX when deleting */ | |
| 218 ASSERT(ds->ds_open_refcount == 0 || | |
| 219 ds->ds_open_refcount == DOS_REF_MAX); | |
| 220 | |
| 221 dprintf_ds(ds, "evicting %s\n", ""); | |
| 222 | |
| 223 unique_remove(ds->ds_phys->ds_fsid_guid); | |
| 224 | |
| 225 if (ds->ds_user_ptr != NULL) | |
| 226 ds->ds_user_evict_func(ds, ds->ds_user_ptr); | |
| 227 | |
| 228 if (ds->ds_prev) { | |
| 229 dsl_dataset_close(ds->ds_prev, DS_MODE_NONE, ds); | |
| 230 ds->ds_prev = NULL; | |
| 231 } | |
| 232 | |
| 233 bplist_close(&ds->ds_deadlist); | |
| 234 dsl_dir_close(ds->ds_dir, ds); | |
| 235 | |
| 236 if (list_link_active(&ds->ds_synced_link)) | |
| 237 list_remove(&dp->dp_synced_objsets, ds); | |
| 238 | |
| 2856 | 239 mutex_destroy(&ds->ds_lock); |
| 240 mutex_destroy(&ds->ds_deadlist.bpl_lock); | |
| 241 | |
| 789 | 242 kmem_free(ds, sizeof (dsl_dataset_t)); |
| 243 } | |
| 244 | |
| 1544 | 245 static int |
| 789 | 246 dsl_dataset_get_snapname(dsl_dataset_t *ds) |
| 247 { | |
| 248 dsl_dataset_phys_t *headphys; | |
| 249 int err; | |
| 250 dmu_buf_t *headdbuf; | |
| 251 dsl_pool_t *dp = ds->ds_dir->dd_pool; | |
| 252 objset_t *mos = dp->dp_meta_objset; | |
| 253 | |
| 254 if (ds->ds_snapname[0]) | |
| 1544 | 255 return (0); |
| 789 | 256 if (ds->ds_phys->ds_next_snap_obj == 0) |
| 1544 | 257 return (0); |
| 789 | 258 |
| 1544 | 259 err = dmu_bonus_hold(mos, ds->ds_dir->dd_phys->dd_head_dataset_obj, |
| 260 FTAG, &headdbuf); | |
| 261 if (err) | |
| 262 return (err); | |
| 789 | 263 headphys = headdbuf->db_data; |
| 264 err = zap_value_search(dp->dp_meta_objset, | |
| 265 headphys->ds_snapnames_zapobj, ds->ds_object, ds->ds_snapname); | |
| 1544 | 266 dmu_buf_rele(headdbuf, FTAG); |
| 267 return (err); | |
| 789 | 268 } |
| 269 | |
| 1544 | 270 int |
| 789 | 271 dsl_dataset_open_obj(dsl_pool_t *dp, uint64_t dsobj, const char *snapname, |
| 1544 | 272 int mode, void *tag, dsl_dataset_t **dsp) |
| 789 | 273 { |
| 274 uint64_t weight = ds_refcnt_weight[DS_MODE_LEVEL(mode)]; | |
| 275 objset_t *mos = dp->dp_meta_objset; | |
| 276 dmu_buf_t *dbuf; | |
| 277 dsl_dataset_t *ds; | |
| 1544 | 278 int err; |
| 789 | 279 |
| 280 ASSERT(RW_LOCK_HELD(&dp->dp_config_rwlock) || | |
| 281 dsl_pool_sync_context(dp)); | |
| 282 | |
| 1544 | 283 err = dmu_bonus_hold(mos, dsobj, tag, &dbuf); |
| 284 if (err) | |
| 285 return (err); | |
| 789 | 286 ds = dmu_buf_get_user(dbuf); |
| 287 if (ds == NULL) { | |
| 288 dsl_dataset_t *winner; | |
| 289 | |
| 290 ds = kmem_zalloc(sizeof (dsl_dataset_t), KM_SLEEP); | |
| 291 ds->ds_dbuf = dbuf; | |
| 292 ds->ds_object = dsobj; | |
| 293 ds->ds_phys = dbuf->db_data; | |
| 294 | |
| 2856 | 295 mutex_init(&ds->ds_lock, NULL, MUTEX_DEFAULT, NULL); |
| 296 mutex_init(&ds->ds_deadlist.bpl_lock, NULL, MUTEX_DEFAULT, | |
| 297 NULL); | |
| 298 | |
| 1544 | 299 err = bplist_open(&ds->ds_deadlist, |
| 789 | 300 mos, ds->ds_phys->ds_deadlist_obj); |
| 1544 | 301 if (err == 0) { |
| 302 err = dsl_dir_open_obj(dp, | |
| 303 ds->ds_phys->ds_dir_obj, NULL, ds, &ds->ds_dir); | |
| 304 } | |
| 305 if (err) { | |
| 306 /* | |
| 307 * we don't really need to close the blist if we | |
| 308 * just opened it. | |
| 309 */ | |
| 2856 | 310 mutex_destroy(&ds->ds_lock); |
| 311 mutex_destroy(&ds->ds_deadlist.bpl_lock); | |
| 1544 | 312 kmem_free(ds, sizeof (dsl_dataset_t)); |
| 313 dmu_buf_rele(dbuf, tag); | |
| 314 return (err); | |
| 315 } | |
| 789 | 316 |
| 317 if (ds->ds_dir->dd_phys->dd_head_dataset_obj == dsobj) { | |
| 318 ds->ds_snapname[0] = '\0'; | |
| 319 if (ds->ds_phys->ds_prev_snap_obj) { | |
| 1544 | 320 err = dsl_dataset_open_obj(dp, |
| 789 | 321 ds->ds_phys->ds_prev_snap_obj, NULL, |
| 1544 | 322 DS_MODE_NONE, ds, &ds->ds_prev); |
| 789 | 323 } |
| 324 } else { | |
| 325 if (snapname) { | |
| 326 #ifdef ZFS_DEBUG | |
| 327 dsl_dataset_phys_t *headphys; | |
| 1544 | 328 dmu_buf_t *headdbuf; |
| 329 err = dmu_bonus_hold(mos, | |
| 330 ds->ds_dir->dd_phys->dd_head_dataset_obj, | |
| 331 FTAG, &headdbuf); | |
| 332 if (err == 0) { | |
| 333 headphys = headdbuf->db_data; | |
| 334 uint64_t foundobj; | |
| 335 err = zap_lookup(dp->dp_meta_objset, | |
| 336 headphys->ds_snapnames_zapobj, | |
| 337 snapname, sizeof (foundobj), 1, | |
| 338 &foundobj); | |
| 339 ASSERT3U(foundobj, ==, dsobj); | |
| 340 dmu_buf_rele(headdbuf, FTAG); | |
| 341 } | |
| 789 | 342 #endif |
| 343 (void) strcat(ds->ds_snapname, snapname); | |
| 344 } else if (zfs_flags & ZFS_DEBUG_SNAPNAMES) { | |
| 1544 | 345 err = dsl_dataset_get_snapname(ds); |
| 789 | 346 } |
| 347 } | |
| 348 | |
| 1544 | 349 if (err == 0) { |
| 350 winner = dmu_buf_set_user_ie(dbuf, ds, &ds->ds_phys, | |
| 351 dsl_dataset_evict); | |
| 352 } | |
| 353 if (err || winner) { | |
| 789 | 354 bplist_close(&ds->ds_deadlist); |
| 355 if (ds->ds_prev) { | |
| 356 dsl_dataset_close(ds->ds_prev, | |
| 357 DS_MODE_NONE, ds); | |
| 358 } | |
| 359 dsl_dir_close(ds->ds_dir, ds); | |
| 2856 | 360 mutex_destroy(&ds->ds_lock); |
| 361 mutex_destroy(&ds->ds_deadlist.bpl_lock); | |
| 789 | 362 kmem_free(ds, sizeof (dsl_dataset_t)); |
| 1544 | 363 if (err) { |
| 364 dmu_buf_rele(dbuf, tag); | |
| 365 return (err); | |
| 366 } | |
| 789 | 367 ds = winner; |
| 368 } else { | |
| 369 uint64_t new = | |
| 370 unique_insert(ds->ds_phys->ds_fsid_guid); | |
| 371 if (new != ds->ds_phys->ds_fsid_guid) { | |
| 372 /* XXX it won't necessarily be synced... */ | |
| 373 ds->ds_phys->ds_fsid_guid = new; | |
| 374 } | |
| 375 } | |
| 376 } | |
| 377 ASSERT3P(ds->ds_dbuf, ==, dbuf); | |
| 378 ASSERT3P(ds->ds_phys, ==, dbuf->db_data); | |
| 379 | |
| 380 mutex_enter(&ds->ds_lock); | |
| 381 if ((DS_MODE_LEVEL(mode) == DS_MODE_PRIMARY && | |
| 2082 | 382 (ds->ds_phys->ds_flags & DS_FLAG_INCONSISTENT) && |
| 383 !DS_MODE_IS_INCONSISTENT(mode)) || | |
| 789 | 384 (ds->ds_open_refcount + weight > DOS_REF_MAX)) { |
| 385 mutex_exit(&ds->ds_lock); | |
| 386 dsl_dataset_close(ds, DS_MODE_NONE, tag); | |
| 1544 | 387 return (EBUSY); |
| 789 | 388 } |
| 389 ds->ds_open_refcount += weight; | |
| 390 mutex_exit(&ds->ds_lock); | |
| 391 | |
| 1544 | 392 *dsp = ds; |
| 393 return (0); | |
| 789 | 394 } |
| 395 | |
| 396 int | |
| 397 dsl_dataset_open_spa(spa_t *spa, const char *name, int mode, | |
| 398 void *tag, dsl_dataset_t **dsp) | |
| 399 { | |
| 400 dsl_dir_t *dd; | |
| 401 dsl_pool_t *dp; | |
| 402 const char *tail; | |
| 403 uint64_t obj; | |
| 404 dsl_dataset_t *ds = NULL; | |
| 405 int err = 0; | |
| 406 | |
| 1544 | 407 err = dsl_dir_open_spa(spa, name, FTAG, &dd, &tail); |
| 408 if (err) | |
| 409 return (err); | |
| 789 | 410 |
| 411 dp = dd->dd_pool; | |
| 412 obj = dd->dd_phys->dd_head_dataset_obj; | |
| 413 rw_enter(&dp->dp_config_rwlock, RW_READER); | |
| 414 if (obj == 0) { | |
| 415 /* A dataset with no associated objset */ | |
| 416 err = ENOENT; | |
| 417 goto out; | |
| 418 } | |
| 419 | |
| 420 if (tail != NULL) { | |
| 421 objset_t *mos = dp->dp_meta_objset; | |
| 422 | |
| 1544 | 423 err = dsl_dataset_open_obj(dp, obj, NULL, |
| 424 DS_MODE_NONE, tag, &ds); | |
| 425 if (err) | |
| 426 goto out; | |
| 789 | 427 obj = ds->ds_phys->ds_snapnames_zapobj; |
| 428 dsl_dataset_close(ds, DS_MODE_NONE, tag); | |
| 429 ds = NULL; | |
| 430 | |
| 431 if (tail[0] != '@') { | |
| 432 err = ENOENT; | |
| 433 goto out; | |
| 434 } | |
| 435 tail++; | |
| 436 | |
| 437 /* Look for a snapshot */ | |
| 438 if (!DS_MODE_IS_READONLY(mode)) { | |
| 439 err = EROFS; | |
| 440 goto out; | |
| 441 } | |
| 442 dprintf("looking for snapshot '%s'\n", tail); | |
| 443 err = zap_lookup(mos, obj, tail, 8, 1, &obj); | |
| 444 if (err) | |
| 445 goto out; | |
| 446 } | |
| 1544 | 447 err = dsl_dataset_open_obj(dp, obj, tail, mode, tag, &ds); |
| 789 | 448 |
| 449 out: | |
| 450 rw_exit(&dp->dp_config_rwlock); | |
| 451 dsl_dir_close(dd, FTAG); | |
| 452 | |
| 453 ASSERT3U((err == 0), ==, (ds != NULL)); | |
| 454 /* ASSERT(ds == NULL || strcmp(name, ds->ds_name) == 0); */ | |
| 455 | |
| 456 *dsp = ds; | |
| 457 return (err); | |
| 458 } | |
| 459 | |
| 460 int | |
| 461 dsl_dataset_open(const char *name, int mode, void *tag, dsl_dataset_t **dsp) | |
| 462 { | |
| 463 return (dsl_dataset_open_spa(NULL, name, mode, tag, dsp)); | |
| 464 } | |
| 465 | |
| 466 void | |
| 467 dsl_dataset_name(dsl_dataset_t *ds, char *name) | |
| 468 { | |
| 469 if (ds == NULL) { | |
| 470 (void) strcpy(name, "mos"); | |
| 471 } else { | |
| 472 dsl_dir_name(ds->ds_dir, name); | |
| 1544 | 473 VERIFY(0 == dsl_dataset_get_snapname(ds)); |
| 789 | 474 if (ds->ds_snapname[0]) { |
| 475 (void) strcat(name, "@"); | |
| 476 if (!MUTEX_HELD(&ds->ds_lock)) { | |
| 477 /* | |
| 478 * We use a "recursive" mutex so that we | |
| 479 * can call dprintf_ds() with ds_lock held. | |
| 480 */ | |
| 481 mutex_enter(&ds->ds_lock); | |
| 482 (void) strcat(name, ds->ds_snapname); | |
| 483 mutex_exit(&ds->ds_lock); | |
| 484 } else { | |
| 485 (void) strcat(name, ds->ds_snapname); | |
| 486 } | |
| 487 } | |
| 488 } | |
| 489 } | |
| 490 | |
| 491 void | |
| 492 dsl_dataset_close(dsl_dataset_t *ds, int mode, void *tag) | |
| 493 { | |
| 494 uint64_t weight = ds_refcnt_weight[DS_MODE_LEVEL(mode)]; | |
| 495 mutex_enter(&ds->ds_lock); | |
| 496 ASSERT3U(ds->ds_open_refcount, >=, weight); | |
| 497 ds->ds_open_refcount -= weight; | |
| 498 dprintf_ds(ds, "closing mode %u refcount now 0x%llx\n", | |
| 499 mode, ds->ds_open_refcount); | |
| 500 mutex_exit(&ds->ds_lock); | |
| 501 | |
| 1544 | 502 dmu_buf_rele(ds->ds_dbuf, tag); |
| 789 | 503 } |
| 504 | |
| 505 void | |
| 506 dsl_dataset_create_root(dsl_pool_t *dp, uint64_t *ddobjp, dmu_tx_t *tx) | |
| 507 { | |
| 508 objset_t *mos = dp->dp_meta_objset; | |
| 509 dmu_buf_t *dbuf; | |
| 510 dsl_dataset_phys_t *dsphys; | |
| 511 dsl_dataset_t *ds; | |
| 512 uint64_t dsobj; | |
| 513 dsl_dir_t *dd; | |
| 514 | |
| 515 dsl_dir_create_root(mos, ddobjp, tx); | |
| 1544 | 516 VERIFY(0 == dsl_dir_open_obj(dp, *ddobjp, NULL, FTAG, &dd)); |
| 789 | 517 |
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518 dsobj = dmu_object_alloc(mos, DMU_OT_DSL_DATASET, 0, |
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519 DMU_OT_DSL_DATASET, sizeof (dsl_dataset_phys_t), tx); |
| 1544 | 520 VERIFY(0 == dmu_bonus_hold(mos, dsobj, FTAG, &dbuf)); |
| 789 | 521 dmu_buf_will_dirty(dbuf, tx); |
| 522 dsphys = dbuf->db_data; | |
| 523 dsphys->ds_dir_obj = dd->dd_object; | |
| 524 dsphys->ds_fsid_guid = unique_create(); | |
| 1544 | 525 unique_remove(dsphys->ds_fsid_guid); /* it isn't open yet */ |
| 789 | 526 (void) random_get_pseudo_bytes((void*)&dsphys->ds_guid, |
| 527 sizeof (dsphys->ds_guid)); | |
| 528 dsphys->ds_snapnames_zapobj = | |
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529 zap_create(mos, DMU_OT_DSL_DS_SNAP_MAP, DMU_OT_NONE, 0, tx); |
| 789 | 530 dsphys->ds_creation_time = gethrestime_sec(); |
| 531 dsphys->ds_creation_txg = tx->tx_txg; | |
| 532 dsphys->ds_deadlist_obj = | |
| 533 bplist_create(mos, DSL_DEADLIST_BLOCKSIZE, tx); | |
| 1544 | 534 dmu_buf_rele(dbuf, FTAG); |
| 789 | 535 |
| 536 dmu_buf_will_dirty(dd->dd_dbuf, tx); | |
| 537 dd->dd_phys->dd_head_dataset_obj = dsobj; | |
| 538 dsl_dir_close(dd, FTAG); | |
| 539 | |
| 1544 | 540 VERIFY(0 == |
| 541 dsl_dataset_open_obj(dp, dsobj, NULL, DS_MODE_NONE, FTAG, &ds)); | |
| 789 | 542 (void) dmu_objset_create_impl(dp->dp_spa, ds, DMU_OST_ZFS, tx); |
| 543 dsl_dataset_close(ds, DS_MODE_NONE, FTAG); | |
| 544 } | |
| 545 | |
| 2199 | 546 uint64_t |
| 547 dsl_dataset_create_sync(dsl_dir_t *pdd, | |
| 789 | 548 const char *lastname, dsl_dataset_t *clone_parent, dmu_tx_t *tx) |
| 549 { | |
| 2199 | 550 dsl_pool_t *dp = pdd->dd_pool; |
| 789 | 551 dmu_buf_t *dbuf; |
| 552 dsl_dataset_phys_t *dsphys; | |
| 2199 | 553 uint64_t dsobj, ddobj; |
| 789 | 554 objset_t *mos = dp->dp_meta_objset; |
| 555 dsl_dir_t *dd; | |
| 556 | |
| 2199 | 557 ASSERT(clone_parent == NULL || clone_parent->ds_dir->dd_pool == dp); |
| 558 ASSERT(clone_parent == NULL || | |
| 559 clone_parent->ds_phys->ds_num_children > 0); | |
| 789 | 560 ASSERT(lastname[0] != '@'); |
| 561 ASSERT(dmu_tx_is_syncing(tx)); | |
| 562 | |
| 2199 | 563 ddobj = dsl_dir_create_sync(pdd, lastname, tx); |
| 564 VERIFY(0 == dsl_dir_open_obj(dp, ddobj, lastname, FTAG, &dd)); | |
| 789 | 565 |
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566 dsobj = dmu_object_alloc(mos, DMU_OT_DSL_DATASET, 0, |
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567 DMU_OT_DSL_DATASET, sizeof (dsl_dataset_phys_t), tx); |
| 1544 | 568 VERIFY(0 == dmu_bonus_hold(mos, dsobj, FTAG, &dbuf)); |
| 789 | 569 dmu_buf_will_dirty(dbuf, tx); |
| 570 dsphys = dbuf->db_data; | |
| 571 dsphys->ds_dir_obj = dd->dd_object; | |
| 572 dsphys->ds_fsid_guid = unique_create(); | |
| 573 unique_remove(dsphys->ds_fsid_guid); /* it isn't open yet */ | |
| 574 (void) random_get_pseudo_bytes((void*)&dsphys->ds_guid, | |
| 575 sizeof (dsphys->ds_guid)); | |
| 576 dsphys->ds_snapnames_zapobj = | |
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577 zap_create(mos, DMU_OT_DSL_DS_SNAP_MAP, DMU_OT_NONE, 0, tx); |
| 789 | 578 dsphys->ds_creation_time = gethrestime_sec(); |
| 579 dsphys->ds_creation_txg = tx->tx_txg; | |
| 580 dsphys->ds_deadlist_obj = | |
| 581 bplist_create(mos, DSL_DEADLIST_BLOCKSIZE, tx); | |
| 582 if (clone_parent) { | |
| 583 dsphys->ds_prev_snap_obj = clone_parent->ds_object; | |
| 584 dsphys->ds_prev_snap_txg = | |
| 585 clone_parent->ds_phys->ds_creation_txg; | |
| 586 dsphys->ds_used_bytes = | |
| 587 clone_parent->ds_phys->ds_used_bytes; | |
| 588 dsphys->ds_compressed_bytes = | |
| 589 clone_parent->ds_phys->ds_compressed_bytes; | |
| 590 dsphys->ds_uncompressed_bytes = | |
| 591 clone_parent->ds_phys->ds_uncompressed_bytes; | |
| 592 dsphys->ds_bp = clone_parent->ds_phys->ds_bp; | |
| 593 | |
| 594 dmu_buf_will_dirty(clone_parent->ds_dbuf, tx); | |
| 595 clone_parent->ds_phys->ds_num_children++; | |
| 596 | |
| 597 dmu_buf_will_dirty(dd->dd_dbuf, tx); | |
| 598 dd->dd_phys->dd_clone_parent_obj = clone_parent->ds_object; | |
| 599 } | |
| 1544 | 600 dmu_buf_rele(dbuf, FTAG); |
| 789 | 601 |
| 602 dmu_buf_will_dirty(dd->dd_dbuf, tx); | |
| 603 dd->dd_phys->dd_head_dataset_obj = dsobj; | |
| 604 dsl_dir_close(dd, FTAG); | |
| 605 | |
| 2199 | 606 return (dsobj); |
| 607 } | |
| 608 | |
| 609 struct destroyarg { | |
| 610 dsl_sync_task_group_t *dstg; | |
| 611 char *snapname; | |
| 612 void *tag; | |
| 613 char *failed; | |
| 614 }; | |
| 615 | |
| 616 static int | |
| 617 dsl_snapshot_destroy_one(char *name, void *arg) | |
| 618 { | |
| 619 struct destroyarg *da = arg; | |
| 620 dsl_dataset_t *ds; | |
| 621 char *cp; | |
| 622 int err; | |
| 623 | |
| 624 (void) strcat(name, "@"); | |
| 625 (void) strcat(name, da->snapname); | |
| 626 err = dsl_dataset_open(name, | |
| 627 DS_MODE_EXCLUSIVE | DS_MODE_READONLY | DS_MODE_INCONSISTENT, | |
| 628 da->tag, &ds); | |
| 629 cp = strchr(name, '@'); | |
| 630 *cp = '\0'; | |
| 631 if (err == ENOENT) | |
| 632 return (0); | |
| 633 if (err) { | |
| 634 (void) strcpy(da->failed, name); | |
| 635 return (err); | |
| 636 } | |
| 637 | |
| 638 dsl_sync_task_create(da->dstg, dsl_dataset_destroy_check, | |
| 639 dsl_dataset_destroy_sync, ds, da->tag, 0); | |
| 789 | 640 return (0); |
| 641 } | |
| 642 | |
| 2199 | 643 /* |
| 644 * Destroy 'snapname' in all descendants of 'fsname'. | |
| 645 */ | |
| 646 #pragma weak dmu_snapshots_destroy = dsl_snapshots_destroy | |
| 647 int | |
| 648 dsl_snapshots_destroy(char *fsname, char *snapname) | |
| 649 { | |
| 650 int err; | |
| 651 struct destroyarg da; | |
| 652 dsl_sync_task_t *dst; | |
| 653 spa_t *spa; | |
| 654 char *cp; | |
| 655 | |
| 656 cp = strchr(fsname, '/'); | |
| 657 if (cp) { | |
| 658 *cp = '\0'; | |
| 659 err = spa_open(fsname, &spa, FTAG); | |
| 660 *cp = '/'; | |
| 661 } else { | |
| 662 err = spa_open(fsname, &spa, FTAG); | |
| 663 } | |
| 664 if (err) | |
| 665 return (err); | |
| 666 da.dstg = dsl_sync_task_group_create(spa_get_dsl(spa)); | |
| 667 da.snapname = snapname; | |
| 668 da.tag = FTAG; | |
| 669 da.failed = fsname; | |
| 670 | |
| 671 err = dmu_objset_find(fsname, | |
| 2417 | 672 dsl_snapshot_destroy_one, &da, DS_FIND_CHILDREN); |
| 2199 | 673 |
| 674 if (err == 0) | |
| 675 err = dsl_sync_task_group_wait(da.dstg); | |
| 676 | |
| 677 for (dst = list_head(&da.dstg->dstg_tasks); dst; | |
| 678 dst = list_next(&da.dstg->dstg_tasks, dst)) { | |
| 679 dsl_dataset_t *ds = dst->dst_arg1; | |
| 680 if (dst->dst_err) { | |
| 681 dsl_dataset_name(ds, fsname); | |
| 682 cp = strchr(fsname, '@'); | |
| 683 *cp = '\0'; | |
| 684 } | |
| 685 /* | |
| 686 * If it was successful, destroy_sync would have | |
| 687 * closed the ds | |
| 688 */ | |
| 689 if (err) | |
| 690 dsl_dataset_close(ds, DS_MODE_EXCLUSIVE, FTAG); | |
| 691 } | |
| 692 | |
| 693 dsl_sync_task_group_destroy(da.dstg); | |
| 694 spa_close(spa, FTAG); | |
| 695 return (err); | |
| 696 } | |
| 697 | |
| 789 | 698 int |
| 699 dsl_dataset_destroy(const char *name) | |
| 700 { | |
| 701 int err; | |
| 2199 | 702 dsl_sync_task_group_t *dstg; |
| 703 objset_t *os; | |
| 704 dsl_dataset_t *ds; | |
| 789 | 705 dsl_dir_t *dd; |
| 2199 | 706 uint64_t obj; |
| 707 | |
| 708 if (strchr(name, '@')) { | |
| 709 /* Destroying a snapshot is simpler */ | |
| 710 err = dsl_dataset_open(name, | |
| 711 DS_MODE_EXCLUSIVE | DS_MODE_READONLY | DS_MODE_INCONSISTENT, | |
| 712 FTAG, &ds); | |
| 713 if (err) | |
| 714 return (err); | |
| 715 err = dsl_sync_task_do(ds->ds_dir->dd_pool, | |
| 716 dsl_dataset_destroy_check, dsl_dataset_destroy_sync, | |
| 717 ds, FTAG, 0); | |
| 718 if (err) | |
| 719 dsl_dataset_close(ds, DS_MODE_EXCLUSIVE, FTAG); | |
| 720 return (err); | |
| 721 } | |
| 722 | |
| 723 err = dmu_objset_open(name, DMU_OST_ANY, | |
| 724 DS_MODE_EXCLUSIVE | DS_MODE_INCONSISTENT, &os); | |
| 725 if (err) | |
| 726 return (err); | |
| 727 ds = os->os->os_dsl_dataset; | |
| 728 dd = ds->ds_dir; | |
| 789 | 729 |
| 2199 | 730 /* |
| 731 * Check for errors and mark this ds as inconsistent, in | |
| 732 * case we crash while freeing the objects. | |
| 733 */ | |
| 734 err = dsl_sync_task_do(dd->dd_pool, dsl_dataset_destroy_begin_check, | |
| 735 dsl_dataset_destroy_begin_sync, ds, NULL, 0); | |
| 736 if (err) { | |
| 737 dmu_objset_close(os); | |
| 738 return (err); | |
| 739 } | |
| 740 | |
| 741 /* | |
| 742 * remove the objects in open context, so that we won't | |
| 743 * have too much to do in syncing context. | |
| 744 */ | |
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745 for (obj = 0; err == 0; err = dmu_object_next(os, &obj, FALSE, |
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746 ds->ds_phys->ds_prev_snap_txg)) { |
| 2199 | 747 dmu_tx_t *tx = dmu_tx_create(os); |
| 748 dmu_tx_hold_free(tx, obj, 0, DMU_OBJECT_END); | |
| 749 dmu_tx_hold_bonus(tx, obj); | |
| 750 err = dmu_tx_assign(tx, TXG_WAIT); | |
| 751 if (err) { | |
| 752 /* | |
| 753 * Perhaps there is not enough disk | |
| 754 * space. Just deal with it from | |
| 755 * dsl_dataset_destroy_sync(). | |
| 756 */ | |
| 757 dmu_tx_abort(tx); | |
| 758 continue; | |
| 759 } | |
| 760 VERIFY(0 == dmu_object_free(os, obj, tx)); | |
| 761 dmu_tx_commit(tx); | |
| 762 } | |
| 763 /* Make sure it's not dirty before we finish destroying it. */ | |
| 764 txg_wait_synced(dd->dd_pool, 0); | |
| 765 | |
| 766 dmu_objset_close(os); | |
| 767 if (err != ESRCH) | |
| 768 return (err); | |
| 769 | |
| 770 err = dsl_dataset_open(name, | |
| 771 DS_MODE_EXCLUSIVE | DS_MODE_READONLY | DS_MODE_INCONSISTENT, | |
| 772 FTAG, &ds); | |
| 1544 | 773 if (err) |
| 774 return (err); | |
| 789 | 775 |
| 2199 | 776 err = dsl_dir_open(name, FTAG, &dd, NULL); |
| 777 if (err) { | |
| 778 dsl_dataset_close(ds, DS_MODE_EXCLUSIVE, FTAG); | |
| 779 return (err); | |
| 789 | 780 } |
| 781 | |
| 2199 | 782 /* |
| 783 * Blow away the dsl_dir + head dataset. | |
| 784 */ | |
| 785 dstg = dsl_sync_task_group_create(ds->ds_dir->dd_pool); | |
| 786 dsl_sync_task_create(dstg, dsl_dataset_destroy_check, | |
| 787 dsl_dataset_destroy_sync, ds, FTAG, 0); | |
| 788 dsl_sync_task_create(dstg, dsl_dir_destroy_check, | |
| 789 dsl_dir_destroy_sync, dd, FTAG, 0); | |
| 790 err = dsl_sync_task_group_wait(dstg); | |
| 791 dsl_sync_task_group_destroy(dstg); | |
| 792 /* if it is successful, *destroy_sync will close the ds+dd */ | |
| 793 if (err) { | |
| 794 dsl_dataset_close(ds, DS_MODE_EXCLUSIVE, FTAG); | |
| 795 dsl_dir_close(dd, FTAG); | |
| 796 } | |
| 789 | 797 return (err); |
| 798 } | |
| 799 | |
| 800 int | |
| 2199 | 801 dsl_dataset_rollback(dsl_dataset_t *ds) |
| 789 | 802 { |
| 2199 | 803 ASSERT3U(ds->ds_open_refcount, ==, DOS_REF_MAX); |
| 804 return (dsl_sync_task_do(ds->ds_dir->dd_pool, | |
| 805 dsl_dataset_rollback_check, dsl_dataset_rollback_sync, | |
| 806 ds, NULL, 0)); | |
| 789 | 807 } |
| 808 | |
| 809 void * | |
| 810 dsl_dataset_set_user_ptr(dsl_dataset_t *ds, | |
| 811 void *p, dsl_dataset_evict_func_t func) | |
| 812 { | |
| 813 void *old; | |
| 814 | |
| 815 mutex_enter(&ds->ds_lock); | |
| 816 old = ds->ds_user_ptr; | |
| 817 if (old == NULL) { | |
| 818 ds->ds_user_ptr = p; | |
| 819 ds->ds_user_evict_func = func; | |
| 820 } | |
| 821 mutex_exit(&ds->ds_lock); | |
| 822 return (old); | |
| 823 } | |
| 824 | |
| 825 void * | |
| 826 dsl_dataset_get_user_ptr(dsl_dataset_t *ds) | |
| 827 { | |
| 828 return (ds->ds_user_ptr); | |
| 829 } | |
| 830 | |
| 831 | |
| 832 void | |
| 833 dsl_dataset_get_blkptr(dsl_dataset_t *ds, blkptr_t *bp) | |
| 834 { | |
| 835 *bp = ds->ds_phys->ds_bp; | |
| 836 } | |
| 837 | |
| 838 void | |
| 839 dsl_dataset_set_blkptr(dsl_dataset_t *ds, blkptr_t *bp, dmu_tx_t *tx) | |
| 840 { | |
| 841 ASSERT(dmu_tx_is_syncing(tx)); | |
| 842 /* If it's the meta-objset, set dp_meta_rootbp */ | |
| 843 if (ds == NULL) { | |
| 844 tx->tx_pool->dp_meta_rootbp = *bp; | |
| 845 } else { | |
| 846 dmu_buf_will_dirty(ds->ds_dbuf, tx); | |
| 847 ds->ds_phys->ds_bp = *bp; | |
| 848 } | |
| 849 } | |
| 850 | |
| 851 spa_t * | |
| 852 dsl_dataset_get_spa(dsl_dataset_t *ds) | |
| 853 { | |
| 854 return (ds->ds_dir->dd_pool->dp_spa); | |
| 855 } | |
| 856 | |
| 857 void | |
| 858 dsl_dataset_dirty(dsl_dataset_t *ds, dmu_tx_t *tx) | |
| 859 { | |
| 860 dsl_pool_t *dp; | |
| 861 | |
| 862 if (ds == NULL) /* this is the meta-objset */ | |
| 863 return; | |
| 864 | |
| 865 ASSERT(ds->ds_user_ptr != NULL); | |
| 2885 | 866 |
| 867 if (ds->ds_phys->ds_next_snap_obj != 0) | |
| 868 panic("dirtying snapshot!"); | |
| 789 | 869 |
| 870 dp = ds->ds_dir->dd_pool; | |
| 871 | |
| 872 if (txg_list_add(&dp->dp_dirty_datasets, ds, tx->tx_txg) == 0) { | |
| 873 /* up the hold count until we can be written out */ | |
| 874 dmu_buf_add_ref(ds->ds_dbuf, ds); | |
| 875 } | |
| 876 } | |
| 877 | |
| 878 struct killarg { | |
| 879 uint64_t *usedp; | |
| 880 uint64_t *compressedp; | |
| 881 uint64_t *uncompressedp; | |
| 882 zio_t *zio; | |
| 883 dmu_tx_t *tx; | |
| 884 }; | |
| 885 | |
| 886 static int | |
| 887 kill_blkptr(traverse_blk_cache_t *bc, spa_t *spa, void *arg) | |
| 888 { | |
| 889 struct killarg *ka = arg; | |
| 890 blkptr_t *bp = &bc->bc_blkptr; | |
| 891 | |
| 892 ASSERT3U(bc->bc_errno, ==, 0); | |
| 893 | |
| 894 /* | |
| 895 * Since this callback is not called concurrently, no lock is | |
| 896 * needed on the accounting values. | |
| 897 */ | |
| 2082 | 898 *ka->usedp += bp_get_dasize(spa, bp); |
| 789 | 899 *ka->compressedp += BP_GET_PSIZE(bp); |
| 900 *ka->uncompressedp += BP_GET_UCSIZE(bp); | |
| 901 /* XXX check for EIO? */ | |
| 902 (void) arc_free(ka->zio, spa, ka->tx->tx_txg, bp, NULL, NULL, | |
| 903 ARC_NOWAIT); | |
| 904 return (0); | |
| 905 } | |
| 906 | |
| 907 /* ARGSUSED */ | |
| 2199 | 908 static int |
| 909 dsl_dataset_rollback_check(void *arg1, void *arg2, dmu_tx_t *tx) | |
| 789 | 910 { |
| 2199 | 911 dsl_dataset_t *ds = arg1; |
| 789 | 912 |
| 2199 | 913 /* |
| 914 * There must be a previous snapshot. I suppose we could roll | |
| 915 * it back to being empty (and re-initialize the upper (ZPL) | |
| 916 * layer). But for now there's no way to do this via the user | |
| 917 * interface. | |
| 918 */ | |
| 919 if (ds->ds_phys->ds_prev_snap_txg == 0) | |
| 789 | 920 return (EINVAL); |
| 921 | |
| 2199 | 922 /* |
| 923 * This must not be a snapshot. | |
| 924 */ | |
| 925 if (ds->ds_phys->ds_next_snap_obj != 0) | |
| 926 return (EINVAL); | |
| 789 | 927 |
| 928 /* | |
| 929 * If we made changes this txg, traverse_dsl_dataset won't find | |
| 930 * them. Try again. | |
| 931 */ | |
| 2199 | 932 if (ds->ds_phys->ds_bp.blk_birth >= tx->tx_txg) |
| 789 | 933 return (EAGAIN); |
| 2199 | 934 |
| 935 return (0); | |
| 936 } | |
| 789 | 937 |
| 2199 | 938 /* ARGSUSED */ |
| 939 static void | |
| 940 dsl_dataset_rollback_sync(void *arg1, void *arg2, dmu_tx_t *tx) | |
| 941 { | |
| 942 dsl_dataset_t *ds = arg1; | |
| 943 objset_t *mos = ds->ds_dir->dd_pool->dp_meta_objset; | |
| 789 | 944 |
| 945 dmu_buf_will_dirty(ds->ds_dbuf, tx); | |
| 946 | |
| 947 /* Zero out the deadlist. */ | |
| 948 bplist_close(&ds->ds_deadlist); | |
| 949 bplist_destroy(mos, ds->ds_phys->ds_deadlist_obj, tx); | |
| 950 ds->ds_phys->ds_deadlist_obj = | |
| 951 bplist_create(mos, DSL_DEADLIST_BLOCKSIZE, tx); | |
| 1544 | 952 VERIFY(0 == bplist_open(&ds->ds_deadlist, mos, |
| 953 ds->ds_phys->ds_deadlist_obj)); | |
| 789 | 954 |
| 955 { | |
| 956 /* Free blkptrs that we gave birth to */ | |
| 957 zio_t *zio; | |
| 958 uint64_t used = 0, compressed = 0, uncompressed = 0; | |
| 959 struct killarg ka; | |
| 960 | |
| 961 zio = zio_root(tx->tx_pool->dp_spa, NULL, NULL, | |
| 962 ZIO_FLAG_MUSTSUCCEED); | |
| 963 ka.usedp = &used; | |
| 964 ka.compressedp = &compressed; | |
| 965 ka.uncompressedp = &uncompressed; | |
| 966 ka.zio = zio; | |
| 967 ka.tx = tx; | |
| 968 (void) traverse_dsl_dataset(ds, ds->ds_phys->ds_prev_snap_txg, | |
| 969 ADVANCE_POST, kill_blkptr, &ka); | |
| 970 (void) zio_wait(zio); | |
| 971 | |
| 2199 | 972 dsl_dir_diduse_space(ds->ds_dir, |
| 789 | 973 -used, -compressed, -uncompressed, tx); |
| 974 } | |
| 975 | |
| 2199 | 976 /* Change our contents to that of the prev snapshot */ |
| 789 | 977 ASSERT3U(ds->ds_prev->ds_object, ==, ds->ds_phys->ds_prev_snap_obj); |
| 978 ds->ds_phys->ds_bp = ds->ds_prev->ds_phys->ds_bp; | |
| 979 ds->ds_phys->ds_used_bytes = ds->ds_prev->ds_phys->ds_used_bytes; | |
| 980 ds->ds_phys->ds_compressed_bytes = | |
| 981 ds->ds_prev->ds_phys->ds_compressed_bytes; | |
| 982 ds->ds_phys->ds_uncompressed_bytes = | |
| 983 ds->ds_prev->ds_phys->ds_uncompressed_bytes; | |
| 2082 | 984 ds->ds_phys->ds_flags = ds->ds_prev->ds_phys->ds_flags; |
| 789 | 985 ds->ds_phys->ds_unique_bytes = 0; |
| 986 | |
|
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987 if (ds->ds_prev->ds_phys->ds_next_snap_obj == ds->ds_object) { |
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988 dmu_buf_will_dirty(ds->ds_prev->ds_dbuf, tx); |
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989 ds->ds_prev->ds_phys->ds_unique_bytes = 0; |
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990 } |
| 789 | 991 } |
| 992 | |
|
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993 /* ARGSUSED */ |
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994 static int |
| 2199 | 995 dsl_dataset_destroy_begin_check(void *arg1, void *arg2, dmu_tx_t *tx) |
|
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996 { |
| 2199 | 997 dsl_dataset_t *ds = arg1; |
|
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998 |
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999 /* |
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1000 * Can't delete a head dataset if there are snapshots of it. |
|
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1001 * (Except if the only snapshots are from the branch we cloned |
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1002 * from.) |
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1003 */ |
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1004 if (ds->ds_prev != NULL && |
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1005 ds->ds_prev->ds_phys->ds_next_snap_obj == ds->ds_object) |
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1006 return (EINVAL); |
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1007 |
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1008 return (0); |
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1009 } |
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1010 |
| 2199 | 1011 /* ARGSUSED */ |
| 1012 static void | |
| 1013 dsl_dataset_destroy_begin_sync(void *arg1, void *arg2, dmu_tx_t *tx) | |
| 789 | 1014 { |
| 2199 | 1015 dsl_dataset_t *ds = arg1; |
| 789 | 1016 |
| 2199 | 1017 /* Mark it as inconsistent on-disk, in case we crash */ |
| 1018 dmu_buf_will_dirty(ds->ds_dbuf, tx); | |
| 1019 ds->ds_phys->ds_flags |= DS_FLAG_INCONSISTENT; | |
| 1020 } | |
| 789 | 1021 |
| 2199 | 1022 /* ARGSUSED */ |
| 1023 static int | |
| 1024 dsl_dataset_destroy_check(void *arg1, void *arg2, dmu_tx_t *tx) | |
| 1025 { | |
| 1026 dsl_dataset_t *ds = arg1; | |
| 789 | 1027 |
| 1028 /* Can't delete a branch point. */ | |
| 2199 | 1029 if (ds->ds_phys->ds_num_children > 1) |
| 1030 return (EEXIST); | |
| 789 | 1031 |
| 1032 /* | |
| 1033 * Can't delete a head dataset if there are snapshots of it. | |
| 1034 * (Except if the only snapshots are from the branch we cloned | |
| 1035 * from.) | |
| 1036 */ | |
| 1037 if (ds->ds_prev != NULL && | |
| 2199 | 1038 ds->ds_prev->ds_phys->ds_next_snap_obj == ds->ds_object) |
| 789 | 1039 return (EINVAL); |
| 1040 | |
| 1041 /* | |
| 1042 * If we made changes this txg, traverse_dsl_dataset won't find | |
| 1043 * them. Try again. | |
| 1044 */ | |
| 2199 | 1045 if (ds->ds_phys->ds_bp.blk_birth >= tx->tx_txg) |
| 789 | 1046 return (EAGAIN); |
| 2199 | 1047 |
| 1048 /* XXX we should do some i/o error checking... */ | |
| 1049 return (0); | |
| 1050 } | |
| 1051 | |
| 1052 static void | |
| 1053 dsl_dataset_destroy_sync(void *arg1, void *tag, dmu_tx_t *tx) | |
| 1054 { | |
| 1055 dsl_dataset_t *ds = arg1; | |
| 1056 uint64_t used = 0, compressed = 0, uncompressed = 0; | |
| 1057 zio_t *zio; | |
| 1058 int err; | |
| 1059 int after_branch_point = FALSE; | |
| 1060 dsl_pool_t *dp = ds->ds_dir->dd_pool; | |
| 1061 objset_t *mos = dp->dp_meta_objset; | |
| 1062 dsl_dataset_t *ds_prev = NULL; | |
| 1063 uint64_t obj; | |
| 1064 | |
| 1065 ASSERT3U(ds->ds_open_refcount, ==, DOS_REF_MAX); | |
| 1066 ASSERT3U(ds->ds_phys->ds_num_children, <=, 1); | |
| 1067 ASSERT(ds->ds_prev == NULL || | |
| 1068 ds->ds_prev->ds_phys->ds_next_snap_obj != ds->ds_object); | |
| 1069 ASSERT3U(ds->ds_phys->ds_bp.blk_birth, <=, tx->tx_txg); | |
| 1070 | |
| 1071 ASSERT(RW_WRITE_HELD(&dp->dp_config_rwlock)); | |
| 1072 | |
| 1073 obj = ds->ds_object; | |
| 789 | 1074 |
| 1075 if (ds->ds_phys->ds_prev_snap_obj != 0) { | |
| 1076 if (ds->ds_prev) { | |
| 1077 ds_prev = ds->ds_prev; | |
| 1078 } else { | |
| 2199 | 1079 VERIFY(0 == dsl_dataset_open_obj(dp, |
| 789 | 1080 ds->ds_phys->ds_prev_snap_obj, NULL, |
| 2199 | 1081 DS_MODE_NONE, FTAG, &ds_prev)); |
| 789 | 1082 } |
| 1083 after_branch_point = | |
| 1084 (ds_prev->ds_phys->ds_next_snap_obj != obj); | |
| 1085 | |
| 1086 dmu_buf_will_dirty(ds_prev->ds_dbuf, tx); | |
| 1087 if (after_branch_point && | |
| 1088 ds->ds_phys->ds_next_snap_obj == 0) { | |
| 1089 /* This clone is toast. */ | |
| 1090 ASSERT(ds_prev->ds_phys->ds_num_children > 1); | |
| 1091 ds_prev->ds_phys->ds_num_children--; | |
| 1092 } else if (!after_branch_point) { | |
| 1093 ds_prev->ds_phys->ds_next_snap_obj = | |
| 1094 ds->ds_phys->ds_next_snap_obj; | |
| 1095 } | |
| 1096 } | |
| 1097 | |
| 1098 zio = zio_root(dp->dp_spa, NULL, NULL, ZIO_FLAG_MUSTSUCCEED); | |
| 1099 | |
| 1100 if (ds->ds_phys->ds_next_snap_obj != 0) { | |
| 2199 | 1101 blkptr_t bp; |
| 789 | 1102 dsl_dataset_t *ds_next; |
| 1103 uint64_t itor = 0; | |
| 1104 | |
| 1105 spa_scrub_restart(dp->dp_spa, tx->tx_txg); | |
| 1106 | |
| 2199 | 1107 VERIFY(0 == dsl_dataset_open_obj(dp, |
| 1544 | 1108 ds->ds_phys->ds_next_snap_obj, NULL, |
| 1109 DS_MODE_NONE, FTAG, &ds_next)); | |
| 789 | 1110 ASSERT3U(ds_next->ds_phys->ds_prev_snap_obj, ==, obj); |
| 1111 | |
| 1112 dmu_buf_will_dirty(ds_next->ds_dbuf, tx); | |
| 1113 ds_next->ds_phys->ds_prev_snap_obj = | |
| 1114 ds->ds_phys->ds_prev_snap_obj; | |
| 1115 ds_next->ds_phys->ds_prev_snap_txg = | |
| 1116 ds->ds_phys->ds_prev_snap_txg; | |
| 1117 ASSERT3U(ds->ds_phys->ds_prev_snap_txg, ==, | |
| 1118 ds_prev ? ds_prev->ds_phys->ds_creation_txg : 0); | |
| 1119 | |
| 1120 /* | |
| 1121 * Transfer to our deadlist (which will become next's | |
| 1122 * new deadlist) any entries from next's current | |
| 1123 * deadlist which were born before prev, and free the | |
| 1124 * other entries. | |
| 1125 * | |
| 1126 * XXX we're doing this long task with the config lock held | |
| 1127 */ | |
| 1128 while (bplist_iterate(&ds_next->ds_deadlist, &itor, | |
| 1129 &bp) == 0) { | |
| 1130 if (bp.blk_birth <= ds->ds_phys->ds_prev_snap_txg) { | |
| 1544 | 1131 VERIFY(0 == bplist_enqueue(&ds->ds_deadlist, |
| 1132 &bp, tx)); | |
| 789 | 1133 if (ds_prev && !after_branch_point && |
| 1134 bp.blk_birth > | |
| 1135 ds_prev->ds_phys->ds_prev_snap_txg) { | |
| 1136 ds_prev->ds_phys->ds_unique_bytes += | |
| 2082 | 1137 bp_get_dasize(dp->dp_spa, &bp); |
| 789 | 1138 } |
| 1139 } else { | |
| 2082 | 1140 used += bp_get_dasize(dp->dp_spa, &bp); |
| 789 | 1141 compressed += BP_GET_PSIZE(&bp); |
| 1142 uncompressed += BP_GET_UCSIZE(&bp); | |
| 1143 /* XXX check return value? */ | |
| 1144 (void) arc_free(zio, dp->dp_spa, tx->tx_txg, | |
| 1145 &bp, NULL, NULL, ARC_NOWAIT); | |
| 1146 } | |
| 1147 } | |
| 1148 | |
| 1149 /* free next's deadlist */ | |
| 1150 bplist_close(&ds_next->ds_deadlist); | |
| 1151 bplist_destroy(mos, ds_next->ds_phys->ds_deadlist_obj, tx); | |
| 1152 | |
| 1153 /* set next's deadlist to our deadlist */ | |
| 1154 ds_next->ds_phys->ds_deadlist_obj = | |
| 1155 ds->ds_phys->ds_deadlist_obj; | |
| 1544 | 1156 VERIFY(0 == bplist_open(&ds_next->ds_deadlist, mos, |
| 1157 ds_next->ds_phys->ds_deadlist_obj)); | |
| 789 | 1158 ds->ds_phys->ds_deadlist_obj = 0; |
| 1159 | |
| 1160 if (ds_next->ds_phys->ds_next_snap_obj != 0) { | |
| 1161 /* | |
| 1162 * Update next's unique to include blocks which | |
| 1163 * were previously shared by only this snapshot | |
| 1164 * and it. Those blocks will be born after the | |
| 1165 * prev snap and before this snap, and will have | |
| 1166 * died after the next snap and before the one | |
| 1167 * after that (ie. be on the snap after next's | |
| 1168 * deadlist). | |
| 1169 * | |
| 1170 * XXX we're doing this long task with the | |
| 1171 * config lock held | |
| 1172 */ | |
| 1173 dsl_dataset_t *ds_after_next; | |
| 1174 | |
| 2199 | 1175 VERIFY(0 == dsl_dataset_open_obj(dp, |
| 789 | 1176 ds_next->ds_phys->ds_next_snap_obj, NULL, |
| 1544 | 1177 DS_MODE_NONE, FTAG, &ds_after_next)); |
| 789 | 1178 itor = 0; |
| 1179 while (bplist_iterate(&ds_after_next->ds_deadlist, | |
| 1180 &itor, &bp) == 0) { | |
| 1181 if (bp.blk_birth > | |
| 1182 ds->ds_phys->ds_prev_snap_txg && | |
| 1183 bp.blk_birth <= | |
| 1184 ds->ds_phys->ds_creation_txg) { | |
| 1185 ds_next->ds_phys->ds_unique_bytes += | |
| 2082 | 1186 bp_get_dasize(dp->dp_spa, &bp); |
| 789 | 1187 } |
| 1188 } | |
| 1189 | |
| 1190 dsl_dataset_close(ds_after_next, DS_MODE_NONE, FTAG); | |
| 1191 ASSERT3P(ds_next->ds_prev, ==, NULL); | |
| 1192 } else { | |
| 1193 /* | |
| 1194 * It would be nice to update the head dataset's | |
| 1195 * unique. To do so we would have to traverse | |
| 1196 * it for blocks born after ds_prev, which is | |
| 1197 * pretty expensive just to maintain something | |
| 1198 * for debugging purposes. | |
| 1199 */ | |
| 1200 ASSERT3P(ds_next->ds_prev, ==, ds); | |
| 1201 dsl_dataset_close(ds_next->ds_prev, DS_MODE_NONE, | |
| 1202 ds_next); | |
| 1203 if (ds_prev) { | |
| 2199 | 1204 VERIFY(0 == dsl_dataset_open_obj(dp, |
| 1544 | 1205 ds->ds_phys->ds_prev_snap_obj, NULL, |
| 1206 DS_MODE_NONE, ds_next, &ds_next->ds_prev)); | |
| 789 | 1207 } else { |
| 1208 ds_next->ds_prev = NULL; | |
| 1209 } | |
| 1210 } | |
| 1211 dsl_dataset_close(ds_next, DS_MODE_NONE, FTAG); | |
| 1212 | |
| 1213 /* | |
| 1214 * NB: unique_bytes is not accurate for head objsets | |
| 1215 * because we don't update it when we delete the most | |
| 1216 * recent snapshot -- see above comment. | |
| 1217 */ | |
| 1218 ASSERT3U(used, ==, ds->ds_phys->ds_unique_bytes); | |
| 1219 } else { | |
| 1220 /* | |
| 1221 * There's no next snapshot, so this is a head dataset. | |
| 1222 * Destroy the deadlist. Unless it's a clone, the | |
| 1223 * deadlist should be empty. (If it's a clone, it's | |
| 1224 * safe to ignore the deadlist contents.) | |
| 1225 */ | |
| 1226 struct killarg ka; | |
| 1227 | |
| 1228 ASSERT(after_branch_point || bplist_empty(&ds->ds_deadlist)); | |
| 1229 bplist_close(&ds->ds_deadlist); | |
| 1230 bplist_destroy(mos, ds->ds_phys->ds_deadlist_obj, tx); | |
| 1231 ds->ds_phys->ds_deadlist_obj = 0; | |
| 1232 | |
| 1233 /* | |
| 1234 * Free everything that we point to (that's born after | |
| 1235 * the previous snapshot, if we are a clone) | |
| 1236 * | |
| 1237 * XXX we're doing this long task with the config lock held | |
| 1238 */ | |
| 1239 ka.usedp = &used; | |
| 1240 ka.compressedp = &compressed; | |
| 1241 ka.uncompressedp = &uncompressed; | |
| 1242 ka.zio = zio; | |
| 1243 ka.tx = tx; | |
| 1244 err = traverse_dsl_dataset(ds, ds->ds_phys->ds_prev_snap_txg, | |
| 1245 ADVANCE_POST, kill_blkptr, &ka); | |
| 1246 ASSERT3U(err, ==, 0); | |
| 1247 } | |
| 1248 | |
| 1249 err = zio_wait(zio); | |
| 1250 ASSERT3U(err, ==, 0); | |
| 1251 | |
| 2199 | 1252 dsl_dir_diduse_space(ds->ds_dir, -used, -compressed, -uncompressed, tx); |
| 789 | 1253 |
| 1254 if (ds->ds_phys->ds_snapnames_zapobj) { | |
| 1255 err = zap_destroy(mos, ds->ds_phys->ds_snapnames_zapobj, tx); | |
| 1256 ASSERT(err == 0); | |
| 1257 } | |
| 1258 | |
| 2199 | 1259 if (ds->ds_dir->dd_phys->dd_head_dataset_obj == ds->ds_object) { |
| 789 | 1260 /* Erase the link in the dataset */ |
| 2199 | 1261 dmu_buf_will_dirty(ds->ds_dir->dd_dbuf, tx); |
| 1262 ds->ds_dir->dd_phys->dd_head_dataset_obj = 0; | |
| 789 | 1263 /* |
| 1264 * dsl_dir_sync_destroy() called us, they'll destroy | |
| 1265 * the dataset. | |
| 1266 */ | |
| 1267 } else { | |
| 1268 /* remove from snapshot namespace */ | |
| 1269 dsl_dataset_t *ds_head; | |
| 2199 | 1270 VERIFY(0 == dsl_dataset_open_obj(dp, |
| 1271 ds->ds_dir->dd_phys->dd_head_dataset_obj, NULL, | |
| 1544 | 1272 DS_MODE_NONE, FTAG, &ds_head)); |
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1273 VERIFY(0 == dsl_dataset_get_snapname(ds)); |
| 789 | 1274 #ifdef ZFS_DEBUG |
| 1275 { | |
| 1276 uint64_t val; | |
| 1277 err = zap_lookup(mos, | |
| 1278 ds_head->ds_phys->ds_snapnames_zapobj, | |
| 2199 | 1279 ds->ds_snapname, 8, 1, &val); |
| 789 | 1280 ASSERT3U(err, ==, 0); |
| 1281 ASSERT3U(val, ==, obj); | |
| 1282 } | |
| 1283 #endif | |
| 1284 err = zap_remove(mos, ds_head->ds_phys->ds_snapnames_zapobj, | |
| 2199 | 1285 ds->ds_snapname, tx); |
| 789 | 1286 ASSERT(err == 0); |
| 1287 dsl_dataset_close(ds_head, DS_MODE_NONE, FTAG); | |
| 1288 } | |
| 1289 | |
| 1290 if (ds_prev && ds->ds_prev != ds_prev) | |
| 1291 dsl_dataset_close(ds_prev, DS_MODE_NONE, FTAG); | |
| 1292 | |
| 2199 | 1293 dsl_dataset_close(ds, DS_MODE_EXCLUSIVE, tag); |
| 1294 VERIFY(0 == dmu_object_free(mos, obj, tx)); | |
| 1295 } | |
| 1296 | |
| 1297 /* ARGSUSED */ | |
| 1298 int | |
| 1299 dsl_dataset_snapshot_check(void *arg1, void *arg2, dmu_tx_t *tx) | |
| 1300 { | |
| 1301 objset_t *os = arg1; | |
| 1302 dsl_dataset_t *ds = os->os->os_dsl_dataset; | |
| 1303 const char *snapname = arg2; | |
| 1304 objset_t *mos = ds->ds_dir->dd_pool->dp_meta_objset; | |
| 1305 int err; | |
| 1306 uint64_t value; | |
| 789 | 1307 |
| 1308 /* | |
| 2199 | 1309 * We don't allow multiple snapshots of the same txg. If there |
| 1310 * is already one, try again. | |
| 1311 */ | |
| 1312 if (ds->ds_phys->ds_prev_snap_txg >= tx->tx_txg) | |
| 1313 return (EAGAIN); | |
| 1314 | |
| 1315 /* | |
| 1316 * Check for conflicting name snapshot name. | |
| 789 | 1317 */ |
| 2199 | 1318 err = zap_lookup(mos, ds->ds_phys->ds_snapnames_zapobj, |
| 1319 snapname, 8, 1, &value); | |
| 1320 if (err == 0) | |
| 1321 return (EEXIST); | |
| 1322 if (err != ENOENT) | |
| 1323 return (err); | |
| 789 | 1324 |
| 2199 | 1325 ds->ds_trysnap_txg = tx->tx_txg; |
| 789 | 1326 return (0); |
| 1327 } | |
| 1328 | |
| 2199 | 1329 void |
| 1330 dsl_dataset_snapshot_sync(void *arg1, void *arg2, dmu_tx_t *tx) | |
| 789 | 1331 { |
| 2199 | 1332 objset_t *os = arg1; |
| 1333 dsl_dataset_t *ds = os->os->os_dsl_dataset; | |
| 1334 const char *snapname = arg2; | |
| 1335 dsl_pool_t *dp = ds->ds_dir->dd_pool; | |
| 789 | 1336 dmu_buf_t *dbuf; |
| 1337 dsl_dataset_phys_t *dsphys; | |
| 2199 | 1338 uint64_t dsobj; |
| 789 | 1339 objset_t *mos = dp->dp_meta_objset; |
| 1340 int err; | |
| 1341 | |
| 1342 spa_scrub_restart(dp->dp_spa, tx->tx_txg); | |
| 2199 | 1343 ASSERT(RW_WRITE_HELD(&dp->dp_config_rwlock)); |
| 789 | 1344 |
|
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1345 dsobj = dmu_object_alloc(mos, DMU_OT_DSL_DATASET, 0, |
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1346 DMU_OT_DSL_DATASET, sizeof (dsl_dataset_phys_t), tx); |
| 1544 | 1347 VERIFY(0 == dmu_bonus_hold(mos, dsobj, FTAG, &dbuf)); |
| 789 | 1348 dmu_buf_will_dirty(dbuf, tx); |
| 1349 dsphys = dbuf->db_data; | |
| 2199 | 1350 dsphys->ds_dir_obj = ds->ds_dir->dd_object; |
| 789 | 1351 dsphys->ds_fsid_guid = unique_create(); |
| 1352 unique_remove(dsphys->ds_fsid_guid); /* it isn't open yet */ | |
| 1353 (void) random_get_pseudo_bytes((void*)&dsphys->ds_guid, | |
| 1354 sizeof (dsphys->ds_guid)); | |
| 1355 dsphys->ds_prev_snap_obj = ds->ds_phys->ds_prev_snap_obj; | |
| 1356 dsphys->ds_prev_snap_txg = ds->ds_phys->ds_prev_snap_txg; | |
| 1357 dsphys->ds_next_snap_obj = ds->ds_object; | |
| 1358 dsphys->ds_num_children = 1; | |
| 1359 dsphys->ds_creation_time = gethrestime_sec(); | |
| 1360 dsphys->ds_creation_txg = tx->tx_txg; | |
| 1361 dsphys->ds_deadlist_obj = ds->ds_phys->ds_deadlist_obj; | |
| 1362 dsphys->ds_used_bytes = ds->ds_phys->ds_used_bytes; | |
| 1363 dsphys->ds_compressed_bytes = ds->ds_phys->ds_compressed_bytes; | |
| 1364 dsphys->ds_uncompressed_bytes = ds->ds_phys->ds_uncompressed_bytes; | |
| 2082 | 1365 dsphys->ds_flags = ds->ds_phys->ds_flags; |
| 789 | 1366 dsphys->ds_bp = ds->ds_phys->ds_bp; |
| 1544 | 1367 dmu_buf_rele(dbuf, FTAG); |
| 789 | 1368 |
| 2199 | 1369 ASSERT3U(ds->ds_prev != 0, ==, ds->ds_phys->ds_prev_snap_obj != 0); |
| 1370 if (ds->ds_prev) { | |
| 1371 ASSERT(ds->ds_prev->ds_phys->ds_next_snap_obj == | |
| 789 | 1372 ds->ds_object || |
| 2199 | 1373 ds->ds_prev->ds_phys->ds_num_children > 1); |
| 1374 if (ds->ds_prev->ds_phys->ds_next_snap_obj == ds->ds_object) { | |
| 1375 dmu_buf_will_dirty(ds->ds_prev->ds_dbuf, tx); | |
| 789 | 1376 ASSERT3U(ds->ds_phys->ds_prev_snap_txg, ==, |
| 2199 | 1377 ds->ds_prev->ds_phys->ds_creation_txg); |
| 1378 ds->ds_prev->ds_phys->ds_next_snap_obj = dsobj; | |
| 789 | 1379 } |
| 1380 } | |
| 1381 | |
| 1382 bplist_close(&ds->ds_deadlist); | |
| 1383 dmu_buf_will_dirty(ds->ds_dbuf, tx); | |
| 1384 ASSERT3U(ds->ds_phys->ds_prev_snap_txg, <, dsphys->ds_creation_txg); | |
| 1385 ds->ds_phys->ds_prev_snap_obj = dsobj; | |
| 1386 ds->ds_phys->ds_prev_snap_txg = dsphys->ds_creation_txg; | |
| 1387 ds->ds_phys->ds_unique_bytes = 0; | |
| 1388 ds->ds_phys->ds_deadlist_obj = | |
| 1389 bplist_create(mos, DSL_DEADLIST_BLOCKSIZE, tx); | |
| 1544 | 1390 VERIFY(0 == bplist_open(&ds->ds_deadlist, mos, |
| 1391 ds->ds_phys->ds_deadlist_obj)); | |
| 789 | 1392 |
| 1393 dprintf("snap '%s' -> obj %llu\n", snapname, dsobj); | |
| 1394 err = zap_add(mos, ds->ds_phys->ds_snapnames_zapobj, | |
| 1395 snapname, 8, 1, &dsobj, tx); | |
| 1396 ASSERT(err == 0); | |
| 1397 | |
| 1398 if (ds->ds_prev) | |
| 1399 dsl_dataset_close(ds->ds_prev, DS_MODE_NONE, ds); | |
| 1544 | 1400 VERIFY(0 == dsl_dataset_open_obj(dp, |
| 1401 ds->ds_phys->ds_prev_snap_obj, snapname, | |
| 1402 DS_MODE_NONE, ds, &ds->ds_prev)); | |
| 789 | 1403 } |
| 1404 | |
| 1405 void | |
| 1406 dsl_dataset_sync(dsl_dataset_t *ds, dmu_tx_t *tx) | |
| 1407 { | |
| 1408 ASSERT(dmu_tx_is_syncing(tx)); | |
| 1409 ASSERT(ds->ds_user_ptr != NULL); | |
| 1410 ASSERT(ds->ds_phys->ds_next_snap_obj == 0); | |
| 1411 | |
| 1412 dmu_objset_sync(ds->ds_user_ptr, tx); | |
| 1413 dsl_dir_dirty(ds->ds_dir, tx); | |
| 1414 bplist_close(&ds->ds_deadlist); | |
| 1415 | |
| 1544 | 1416 dmu_buf_rele(ds->ds_dbuf, ds); |
| 789 | 1417 } |
| 1418 | |
| 1419 void | |
| 2885 | 1420 dsl_dataset_stats(dsl_dataset_t *ds, nvlist_t *nv) |
| 789 | 1421 { |
| 2885 | 1422 dsl_dir_stats(ds->ds_dir, nv); |
| 789 | 1423 |
| 2885 | 1424 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_CREATION, |
| 1425 ds->ds_phys->ds_creation_time); | |
| 1426 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_CREATETXG, | |
| 1427 ds->ds_phys->ds_creation_txg); | |
| 1428 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_REFERENCED, | |
| 1429 ds->ds_phys->ds_used_bytes); | |
| 789 | 1430 |
| 1431 if (ds->ds_phys->ds_next_snap_obj) { | |
| 1432 /* | |
| 1433 * This is a snapshot; override the dd's space used with | |
| 2885 | 1434 * our unique space and compression ratio. |
| 789 | 1435 */ |
| 2885 | 1436 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_USED, |
| 1437 ds->ds_phys->ds_unique_bytes); | |
| 1438 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_COMPRESSRATIO, | |
| 1439 ds->ds_phys->ds_compressed_bytes == 0 ? 100 : | |
| 1440 (ds->ds_phys->ds_uncompressed_bytes * 100 / | |
| 1441 ds->ds_phys->ds_compressed_bytes)); | |
| 789 | 1442 } |
| 1443 } | |
| 1444 | |
| 2885 | 1445 void |
| 1446 dsl_dataset_fast_stat(dsl_dataset_t *ds, dmu_objset_stats_t *stat) | |
| 789 | 1447 { |
| 2885 | 1448 stat->dds_creation_txg = ds->ds_phys->ds_creation_txg; |
| 1449 stat->dds_inconsistent = ds->ds_phys->ds_flags & DS_FLAG_INCONSISTENT; | |
| 1450 if (ds->ds_phys->ds_next_snap_obj) { | |
| 1451 stat->dds_is_snapshot = B_TRUE; | |
| 1452 stat->dds_num_clones = ds->ds_phys->ds_num_children - 1; | |
| 1453 } | |
| 1454 | |
| 1455 /* clone origin is really a dsl_dir thing... */ | |
| 1456 if (ds->ds_dir->dd_phys->dd_clone_parent_obj) { | |
| 1457 dsl_dataset_t *ods; | |
| 1458 | |
| 1459 rw_enter(&ds->ds_dir->dd_pool->dp_config_rwlock, RW_READER); | |
| 1460 VERIFY(0 == dsl_dataset_open_obj(ds->ds_dir->dd_pool, | |
| 1461 ds->ds_dir->dd_phys->dd_clone_parent_obj, | |
| 1462 NULL, DS_MODE_NONE, FTAG, &ods)); | |
| 1463 dsl_dataset_name(ods, stat->dds_clone_of); | |
| 1464 dsl_dataset_close(ods, DS_MODE_NONE, FTAG); | |
| 1465 rw_exit(&ds->ds_dir->dd_pool->dp_config_rwlock); | |
| 1466 } | |
| 1467 } | |
| 1468 | |
| 1469 uint64_t | |
| 1470 dsl_dataset_fsid_guid(dsl_dataset_t *ds) | |
| 1471 { | |
| 1472 return (ds->ds_phys->ds_fsid_guid); | |
| 1473 } | |
| 1474 | |
| 1475 void | |
| 1476 dsl_dataset_space(dsl_dataset_t *ds, | |
| 1477 uint64_t *refdbytesp, uint64_t *availbytesp, | |
| 1478 uint64_t *usedobjsp, uint64_t *availobjsp) | |
| 1479 { | |
| 1480 *refdbytesp = ds->ds_phys->ds_used_bytes; | |
| 1481 *availbytesp = dsl_dir_space_available(ds->ds_dir, NULL, 0, TRUE); | |
| 1482 *usedobjsp = ds->ds_phys->ds_bp.blk_fill; | |
| 1483 *availobjsp = DN_MAX_OBJECT - *usedobjsp; | |
| 789 | 1484 } |
| 1485 | |
| 2199 | 1486 /* ARGSUSED */ |
| 789 | 1487 static int |
| 2199 | 1488 dsl_dataset_snapshot_rename_check(void *arg1, void *arg2, dmu_tx_t *tx) |
| 789 | 1489 { |
| 2199 | 1490 dsl_dataset_t *ds = arg1; |
| 1491 char *newsnapname = arg2; | |
| 1492 dsl_dir_t *dd = ds->ds_dir; | |
| 789 | 1493 objset_t *mos = dd->dd_pool->dp_meta_objset; |
| 2199 | 1494 dsl_dataset_t *hds; |
| 1495 uint64_t val; | |
| 789 | 1496 int err; |
| 1497 | |
| 2199 | 1498 err = dsl_dataset_open_obj(dd->dd_pool, |
| 1499 dd->dd_phys->dd_head_dataset_obj, NULL, DS_MODE_NONE, FTAG, &hds); | |
| 789 | 1500 if (err) |
| 1501 return (err); | |
| 1502 | |
| 2199 | 1503 /* new name better not be in use */ |
| 1504 err = zap_lookup(mos, hds->ds_phys->ds_snapnames_zapobj, | |
| 1505 newsnapname, 8, 1, &val); | |
| 1506 dsl_dataset_close(hds, DS_MODE_NONE, FTAG); | |
| 789 | 1507 |
| 2199 | 1508 if (err == 0) |
| 1509 err = EEXIST; | |
| 1510 else if (err == ENOENT) | |
| 1511 err = 0; | |
| 1512 return (err); | |
| 1513 } | |
| 789 | 1514 |
| 2199 | 1515 static void |
| 1516 dsl_dataset_snapshot_rename_sync(void *arg1, void *arg2, dmu_tx_t *tx) | |
| 1517 { | |
| 1518 dsl_dataset_t *ds = arg1; | |
| 1519 char *newsnapname = arg2; | |
| 1520 dsl_dir_t *dd = ds->ds_dir; | |
| 1521 objset_t *mos = dd->dd_pool->dp_meta_objset; | |
| 1522 dsl_dataset_t *hds; | |
| 1523 int err; | |
| 789 | 1524 |
| 2199 | 1525 ASSERT(ds->ds_phys->ds_next_snap_obj != 0); |
| 789 | 1526 |
| 2199 | 1527 VERIFY(0 == dsl_dataset_open_obj(dd->dd_pool, |
| 1528 dd->dd_phys->dd_head_dataset_obj, NULL, DS_MODE_NONE, FTAG, &hds)); | |
| 789 | 1529 |
| 2199 | 1530 VERIFY(0 == dsl_dataset_get_snapname(ds)); |
| 1531 err = zap_remove(mos, hds->ds_phys->ds_snapnames_zapobj, | |
| 1532 ds->ds_snapname, tx); | |
| 789 | 1533 ASSERT3U(err, ==, 0); |
| 2199 | 1534 mutex_enter(&ds->ds_lock); |
| 1535 (void) strcpy(ds->ds_snapname, newsnapname); | |
| 1536 mutex_exit(&ds->ds_lock); | |
| 1537 err = zap_add(mos, hds->ds_phys->ds_snapnames_zapobj, | |
| 1538 ds->ds_snapname, 8, 1, &ds->ds_object, tx); | |
| 789 | 1539 ASSERT3U(err, ==, 0); |
| 1540 | |
| 2199 | 1541 dsl_dataset_close(hds, DS_MODE_NONE, FTAG); |
| 789 | 1542 } |
| 1543 | |
| 1544 #pragma weak dmu_objset_rename = dsl_dataset_rename | |
| 1545 int | |
| 2199 | 1546 dsl_dataset_rename(const char *oldname, const char *newname) |
| 789 | 1547 { |
| 1548 dsl_dir_t *dd; | |
| 2199 | 1549 dsl_dataset_t *ds; |
| 789 | 1550 const char *tail; |
| 1551 int err; | |
| 1552 | |
| 2199 | 1553 err = dsl_dir_open(oldname, FTAG, &dd, &tail); |
| 1544 | 1554 if (err) |
| 1555 return (err); | |
| 789 | 1556 if (tail == NULL) { |
| 2199 | 1557 err = dsl_dir_rename(dd, newname); |
| 789 | 1558 dsl_dir_close(dd, FTAG); |
| 1559 return (err); | |
| 1560 } | |
| 1561 if (tail[0] != '@') { | |
| 1562 /* the name ended in a nonexistant component */ | |
| 1563 dsl_dir_close(dd, FTAG); | |
| 1564 return (ENOENT); | |
| 1565 } | |
| 1566 | |
| 2199 | 1567 dsl_dir_close(dd, FTAG); |
| 1568 | |
| 1569 /* new name must be snapshot in same filesystem */ | |
| 1570 tail = strchr(newname, '@'); | |
| 1571 if (tail == NULL) | |
| 1572 return (EINVAL); | |
| 1573 tail++; | |
| 1574 if (strncmp(oldname, newname, tail - newname) != 0) | |
| 1575 return (EXDEV); | |
| 789 | 1576 |
| 2199 | 1577 err = dsl_dataset_open(oldname, |
| 1578 DS_MODE_READONLY | DS_MODE_STANDARD, FTAG, &ds); | |
| 1579 if (err) | |
| 1580 return (err); | |
| 1581 | |
| 1582 err = dsl_sync_task_do(ds->ds_dir->dd_pool, | |
| 1583 dsl_dataset_snapshot_rename_check, | |
| 1584 dsl_dataset_snapshot_rename_sync, ds, (char *)tail, 1); | |
| 1585 | |
| 1586 dsl_dataset_close(ds, DS_MODE_STANDARD, FTAG); | |
| 1587 | |
| 789 | 1588 return (err); |
| 1589 } | |
| 2082 | 1590 |
| 2199 | 1591 struct promotearg { |
| 1592 uint64_t used, comp, uncomp, unique; | |
| 1593 uint64_t newnext_obj, snapnames_obj; | |
| 1594 }; | |
| 1595 | |
| 2082 | 1596 static int |
| 2199 | 1597 dsl_dataset_promote_check(void *arg1, void *arg2, dmu_tx_t *tx) |
| 2082 | 1598 { |
| 2199 | 1599 dsl_dataset_t *hds = arg1; |
| 1600 struct promotearg *pa = arg2; | |
| 1601 dsl_dir_t *dd = hds->ds_dir; | |
| 1602 dsl_pool_t *dp = hds->ds_dir->dd_pool; | |
| 2082 | 1603 dsl_dir_t *pdd = NULL; |
| 1604 dsl_dataset_t *ds = NULL; | |
| 1605 dsl_dataset_t *pivot_ds = NULL; | |
| 1606 dsl_dataset_t *newnext_ds = NULL; | |
| 1607 int err; | |
| 1608 char *name = NULL; | |
| 2199 | 1609 uint64_t itor = 0; |
| 2082 | 1610 blkptr_t bp; |
| 1611 | |
| 2199 | 1612 bzero(pa, sizeof (*pa)); |
| 1613 | |
| 2082 | 1614 /* Check that it is a clone */ |
| 1615 if (dd->dd_phys->dd_clone_parent_obj == 0) | |
| 1616 return (EINVAL); | |
| 1617 | |
| 2199 | 1618 /* Since this is so expensive, don't do the preliminary check */ |
| 1619 if (!dmu_tx_is_syncing(tx)) | |
| 1620 return (0); | |
| 1621 | |
| 1622 if (err = dsl_dataset_open_obj(dp, | |
| 2082 | 1623 dd->dd_phys->dd_clone_parent_obj, |
| 1624 NULL, DS_MODE_EXCLUSIVE, FTAG, &pivot_ds)) | |
| 1625 goto out; | |
| 1626 pdd = pivot_ds->ds_dir; | |
| 2199 | 1627 |
| 1628 { | |
| 1629 dsl_dataset_t *phds; | |
| 1630 if (err = dsl_dataset_open_obj(dd->dd_pool, | |
| 1631 pdd->dd_phys->dd_head_dataset_obj, | |
| 1632 NULL, DS_MODE_NONE, FTAG, &phds)) | |
| 1633 goto out; | |
| 1634 pa->snapnames_obj = phds->ds_phys->ds_snapnames_zapobj; | |
| 1635 dsl_dataset_close(phds, DS_MODE_NONE, FTAG); | |
| 1636 } | |
| 2082 | 1637 |
| 1638 if (hds->ds_phys->ds_flags & DS_FLAG_NOPROMOTE) { | |
| 1639 err = EXDEV; | |
| 1640 goto out; | |
| 1641 } | |
| 1642 | |
| 1643 /* find pivot point's new next ds */ | |
| 1644 VERIFY(0 == dsl_dataset_open_obj(dd->dd_pool, hds->ds_object, | |
| 1645 NULL, DS_MODE_NONE, FTAG, &newnext_ds)); | |
| 1646 while (newnext_ds->ds_phys->ds_prev_snap_obj != pivot_ds->ds_object) { | |
| 1647 dsl_dataset_t *prev; | |
| 1648 | |
| 1649 if (err = dsl_dataset_open_obj(dd->dd_pool, | |
| 2199 | 1650 newnext_ds->ds_phys->ds_prev_snap_obj, |
| 1651 NULL, DS_MODE_NONE, FTAG, &prev)) | |
| 2082 | 1652 goto out; |
| 1653 dsl_dataset_close(newnext_ds, DS_MODE_NONE, FTAG); | |
| 1654 newnext_ds = prev; | |
| 1655 } | |
| 2199 | 1656 pa->newnext_obj = newnext_ds->ds_object; |
| 2082 | 1657 |
| 1658 /* compute pivot point's new unique space */ | |
| 1659 while ((err = bplist_iterate(&newnext_ds->ds_deadlist, | |
| 1660 &itor, &bp)) == 0) { | |
| 1661 if (bp.blk_birth > pivot_ds->ds_phys->ds_prev_snap_txg) | |
| 2199 | 1662 pa->unique += bp_get_dasize(dd->dd_pool->dp_spa, &bp); |
| 2082 | 1663 } |
| 1664 if (err != ENOENT) | |
| 1665 goto out; | |
| 1666 | |
| 1667 /* Walk the snapshots that we are moving */ | |
| 1668 name = kmem_alloc(MAXPATHLEN, KM_SLEEP); | |
| 1669 ds = pivot_ds; | |
| 1670 /* CONSTCOND */ | |
| 1671 while (TRUE) { | |
| 1672 uint64_t val, dlused, dlcomp, dluncomp; | |
| 1673 dsl_dataset_t *prev; | |
| 1674 | |
| 1675 /* Check that the snapshot name does not conflict */ | |
| 1676 dsl_dataset_name(ds, name); | |
| 1677 err = zap_lookup(dd->dd_pool->dp_meta_objset, | |
| 1678 hds->ds_phys->ds_snapnames_zapobj, ds->ds_snapname, | |
| 1679 8, 1, &val); | |
| 1680 if (err != ENOENT) { | |
| 1681 if (err == 0) | |
| 1682 err = EEXIST; | |
| 1683 goto out; | |
| 1684 } | |
| 1685 | |
| 1686 /* | |
| 1687 * compute space to transfer. Each snapshot gave birth to: | |
| 1688 * (my used) - (prev's used) + (deadlist's used) | |
| 1689 */ | |
| 2199 | 1690 pa->used += ds->ds_phys->ds_used_bytes; |
| 1691 pa->comp += ds->ds_phys->ds_compressed_bytes; | |
| 1692 pa->uncomp += ds->ds_phys->ds_uncompressed_bytes; | |
| 2082 | 1693 |
| 1694 /* If we reach the first snapshot, we're done. */ | |
| 1695 if (ds->ds_phys->ds_prev_snap_obj == 0) | |
| 1696 break; | |
| 1697 | |
| 1698 if (err = bplist_space(&ds->ds_deadlist, | |
| 1699 &dlused, &dlcomp, &dluncomp)) | |
| 1700 goto out; | |
| 1701 if (err = dsl_dataset_open_obj(dd->dd_pool, | |
| 1702 ds->ds_phys->ds_prev_snap_obj, NULL, DS_MODE_EXCLUSIVE, | |
| 1703 FTAG, &prev)) | |
| 1704 goto out; | |
| 2199 | 1705 pa->used += dlused - prev->ds_phys->ds_used_bytes; |
| 1706 pa->comp += dlcomp - prev->ds_phys->ds_compressed_bytes; | |
| 1707 pa->uncomp += dluncomp - prev->ds_phys->ds_uncompressed_bytes; | |
| 2082 | 1708 |
| 1709 /* | |
| 1710 * We could be a clone of a clone. If we reach our | |
| 1711 * parent's branch point, we're done. | |
| 1712 */ | |
| 1713 if (prev->ds_phys->ds_next_snap_obj != ds->ds_object) { | |
| 1714 dsl_dataset_close(prev, DS_MODE_EXCLUSIVE, FTAG); | |
| 1715 break; | |
| 1716 } | |
| 1717 if (ds != pivot_ds) | |
| 1718 dsl_dataset_close(ds, DS_MODE_EXCLUSIVE, FTAG); | |
| 1719 ds = prev; | |
| 1720 } | |
| 1721 | |
| 1722 /* Check that there is enough space here */ | |
| 2199 | 1723 err = dsl_dir_transfer_possible(pdd, dd, pa->used); |
| 1724 | |
| 1725 out: | |
| 1726 if (ds && ds != pivot_ds) | |
| 1727 dsl_dataset_close(ds, DS_MODE_EXCLUSIVE, FTAG); | |
| 1728 if (pivot_ds) | |
| 1729 dsl_dataset_close(pivot_ds, DS_MODE_EXCLUSIVE, FTAG); | |
| 1730 if (newnext_ds) | |
| 1731 dsl_dataset_close(newnext_ds, DS_MODE_NONE, FTAG); | |
| 1732 if (name) | |
| 1733 kmem_free(name, MAXPATHLEN); | |
| 1734 return (err); | |
| 1735 } | |
| 2082 | 1736 |
| 2199 | 1737 static void |
| 1738 dsl_dataset_promote_sync(void *arg1, void *arg2, dmu_tx_t *tx) | |
| 1739 { | |
| 1740 dsl_dataset_t *hds = arg1; | |
| 1741 struct promotearg *pa = arg2; | |
| 1742 dsl_dir_t *dd = hds->ds_dir; | |
| 1743 dsl_pool_t *dp = hds->ds_dir->dd_pool; | |
| 1744 dsl_dir_t *pdd = NULL; | |
| 1745 dsl_dataset_t *ds, *pivot_ds; | |
| 1746 char *name; | |
| 1747 | |
| 1748 ASSERT(dd->dd_phys->dd_clone_parent_obj != 0); | |
| 1749 ASSERT(0 == (hds->ds_phys->ds_flags & DS_FLAG_NOPROMOTE)); | |
| 1750 | |
| 1751 VERIFY(0 == dsl_dataset_open_obj(dp, | |
| 1752 dd->dd_phys->dd_clone_parent_obj, | |
| 1753 NULL, DS_MODE_EXCLUSIVE, FTAG, &pivot_ds)); | |
| 2417 | 1754 /* |
| 1755 * We need to explicitly open pdd, since pivot_ds's pdd will be | |
| 1756 * changing. | |
| 1757 */ | |
| 1758 VERIFY(0 == dsl_dir_open_obj(dp, pivot_ds->ds_dir->dd_object, | |
| 1759 NULL, FTAG, &pdd)); | |
| 2082 | 1760 |
| 1761 /* move snapshots to this dir */ | |
| 2199 | 1762 name = kmem_alloc(MAXPATHLEN, KM_SLEEP); |
| 2082 | 1763 ds = pivot_ds; |
| 1764 /* CONSTCOND */ | |
| 1765 while (TRUE) { | |
| 1766 dsl_dataset_t *prev; | |
| 1767 | |
| 1768 /* move snap name entry */ | |
| 1769 dsl_dataset_name(ds, name); | |
| 2199 | 1770 VERIFY(0 == zap_remove(dp->dp_meta_objset, |
| 1771 pa->snapnames_obj, ds->ds_snapname, tx)); | |
| 1772 VERIFY(0 == zap_add(dp->dp_meta_objset, | |
| 2082 | 1773 hds->ds_phys->ds_snapnames_zapobj, ds->ds_snapname, |
| 1774 8, 1, &ds->ds_object, tx)); | |
| 1775 | |
| 1776 /* change containing dsl_dir */ | |
| 1777 dmu_buf_will_dirty(ds->ds_dbuf, tx); | |
| 1778 ASSERT3U(ds->ds_phys->ds_dir_obj, ==, pdd->dd_object); | |
| 1779 ds->ds_phys->ds_dir_obj = dd->dd_object; | |
| 1780 ASSERT3P(ds->ds_dir, ==, pdd); | |
| 1781 dsl_dir_close(ds->ds_dir, ds); | |
| 2199 | 1782 VERIFY(0 == dsl_dir_open_obj(dp, dd->dd_object, |
| 2082 | 1783 NULL, ds, &ds->ds_dir)); |
| 1784 | |
| 1785 ASSERT3U(dsl_prop_numcb(ds), ==, 0); | |
| 1786 | |
| 1787 if (ds->ds_phys->ds_prev_snap_obj == 0) | |
| 1788 break; | |
| 1789 | |
| 2199 | 1790 VERIFY(0 == dsl_dataset_open_obj(dp, |
| 2082 | 1791 ds->ds_phys->ds_prev_snap_obj, NULL, DS_MODE_EXCLUSIVE, |
| 1792 FTAG, &prev)); | |
| 1793 | |
| 1794 if (prev->ds_phys->ds_next_snap_obj != ds->ds_object) { | |
| 1795 dsl_dataset_close(prev, DS_MODE_EXCLUSIVE, FTAG); | |
| 1796 break; | |
| 1797 } | |
| 1798 if (ds != pivot_ds) | |
| 1799 dsl_dataset_close(ds, DS_MODE_EXCLUSIVE, FTAG); | |
| 1800 ds = prev; | |
| 1801 } | |
| 2199 | 1802 if (ds != pivot_ds) |
| 1803 dsl_dataset_close(ds, DS_MODE_EXCLUSIVE, FTAG); | |
| 2082 | 1804 |
| 1805 /* change pivot point's next snap */ | |
| 1806 dmu_buf_will_dirty(pivot_ds->ds_dbuf, tx); | |
| 2199 | 1807 pivot_ds->ds_phys->ds_next_snap_obj = pa->newnext_obj; |
| 2082 | 1808 |
| 1809 /* change clone_parent-age */ | |
| 1810 dmu_buf_will_dirty(dd->dd_dbuf, tx); | |
| 1811 ASSERT3U(dd->dd_phys->dd_clone_parent_obj, ==, pivot_ds->ds_object); | |
| 1812 dd->dd_phys->dd_clone_parent_obj = pdd->dd_phys->dd_clone_parent_obj; | |
| 1813 dmu_buf_will_dirty(pdd->dd_dbuf, tx); | |
| 1814 pdd->dd_phys->dd_clone_parent_obj = pivot_ds->ds_object; | |
| 1815 | |
| 1816 /* change space accounting */ | |
| 2199 | 1817 dsl_dir_diduse_space(pdd, -pa->used, -pa->comp, -pa->uncomp, tx); |
| 1818 dsl_dir_diduse_space(dd, pa->used, pa->comp, pa->uncomp, tx); | |
| 1819 pivot_ds->ds_phys->ds_unique_bytes = pa->unique; | |
| 2082 | 1820 |
| 2417 | 1821 dsl_dir_close(pdd, FTAG); |
| 2199 | 1822 dsl_dataset_close(pivot_ds, DS_MODE_EXCLUSIVE, FTAG); |
| 1823 kmem_free(name, MAXPATHLEN); | |
| 2082 | 1824 } |
| 1825 | |
| 1826 int | |
| 1827 dsl_dataset_promote(const char *name) | |
| 1828 { | |
| 1829 dsl_dataset_t *ds; | |
| 1830 int err; | |
| 1831 dmu_object_info_t doi; | |
| 2199 | 1832 struct promotearg pa; |
| 2082 | 1833 |
| 1834 err = dsl_dataset_open(name, DS_MODE_NONE, FTAG, &ds); | |
| 1835 if (err) | |
| 1836 return (err); | |
| 1837 | |
| 1838 err = dmu_object_info(ds->ds_dir->dd_pool->dp_meta_objset, | |
| 1839 ds->ds_phys->ds_snapnames_zapobj, &doi); | |
| 1840 if (err) { | |
| 1841 dsl_dataset_close(ds, DS_MODE_NONE, FTAG); | |
| 1842 return (err); | |
| 1843 } | |
| 1844 | |
| 1845 /* | |
| 1846 * Add in 128x the snapnames zapobj size, since we will be moving | |
| 1847 * a bunch of snapnames to the promoted ds, and dirtying their | |
| 1848 * bonus buffers. | |
| 1849 */ | |
| 2199 | 1850 err = dsl_sync_task_do(ds->ds_dir->dd_pool, |
| 1851 dsl_dataset_promote_check, | |
| 1852 dsl_dataset_promote_sync, ds, &pa, 2 + 2 * doi.doi_physical_blks); | |
| 2082 | 1853 dsl_dataset_close(ds, DS_MODE_NONE, FTAG); |
| 1854 return (err); | |
| 1855 } |