Mercurial > illumos > illumos-gate
annotate usr/src/uts/common/fs/zfs/dsl_dataset.c @ 4569:e80d40447f27
6355623 zfs rename to a valid dataset name, but its snapshot name becomes too long, panics the system
| author | mmusante |
|---|---|
| date | Fri, 29 Jun 2007 11:14:08 -0700 |
| parents | 12bb2876a62e |
| children | ed36b0e652bc |
| 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 /* | |
|
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22 * Copyright 2007 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> | |
| 4007 | 40 #include <sys/zfs_ioctl.h> |
| 4543 | 41 #include <sys/spa.h> |
| 42 #include <sys/sunddi.h> | |
| 789 | 43 |
| 2199 | 44 static dsl_checkfunc_t dsl_dataset_destroy_begin_check; |
| 45 static dsl_syncfunc_t dsl_dataset_destroy_begin_sync; | |
| 46 static dsl_checkfunc_t dsl_dataset_rollback_check; | |
| 47 static dsl_syncfunc_t dsl_dataset_rollback_sync; | |
| 48 static dsl_checkfunc_t dsl_dataset_destroy_check; | |
| 49 static dsl_syncfunc_t dsl_dataset_destroy_sync; | |
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50 |
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51 #define DS_REF_MAX (1ULL << 62) |
| 789 | 52 |
| 53 #define DSL_DEADLIST_BLOCKSIZE SPA_MAXBLOCKSIZE | |
| 54 | |
| 55 /* | |
| 56 * We use weighted reference counts to express the various forms of exclusion | |
| 57 * between different open modes. A STANDARD open is 1 point, an EXCLUSIVE open | |
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58 * is DS_REF_MAX, and a PRIMARY open is little more than half of an EXCLUSIVE. |
| 789 | 59 * This makes the exclusion logic simple: the total refcnt for all opens cannot |
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60 * exceed DS_REF_MAX. For example, EXCLUSIVE opens are exclusive because their |
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61 * weight (DS_REF_MAX) consumes the entire refcnt space. PRIMARY opens consume |
| 789 | 62 * just over half of the refcnt space, so there can't be more than one, but it |
| 63 * can peacefully coexist with any number of STANDARD opens. | |
| 64 */ | |
| 65 static uint64_t ds_refcnt_weight[DS_MODE_LEVELS] = { | |
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66 0, /* DS_MODE_NONE - invalid */ |
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67 1, /* DS_MODE_STANDARD - unlimited number */ |
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68 (DS_REF_MAX >> 1) + 1, /* DS_MODE_PRIMARY - only one of these */ |
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69 DS_REF_MAX /* DS_MODE_EXCLUSIVE - no other opens */ |
| 789 | 70 }; |
| 71 | |
| 72 | |
| 73 void | |
| 74 dsl_dataset_block_born(dsl_dataset_t *ds, blkptr_t *bp, dmu_tx_t *tx) | |
| 75 { | |
| 2082 | 76 int used = bp_get_dasize(tx->tx_pool->dp_spa, bp); |
| 789 | 77 int compressed = BP_GET_PSIZE(bp); |
| 78 int uncompressed = BP_GET_UCSIZE(bp); | |
| 79 | |
| 80 dprintf_bp(bp, "born, ds=%p\n", ds); | |
| 81 | |
| 82 ASSERT(dmu_tx_is_syncing(tx)); | |
| 83 /* It could have been compressed away to nothing */ | |
| 84 if (BP_IS_HOLE(bp)) | |
| 85 return; | |
| 86 ASSERT(BP_GET_TYPE(bp) != DMU_OT_NONE); | |
| 87 ASSERT3U(BP_GET_TYPE(bp), <, DMU_OT_NUMTYPES); | |
| 88 if (ds == NULL) { | |
| 89 /* | |
| 90 * Account for the meta-objset space in its placeholder | |
| 91 * dsl_dir. | |
| 92 */ | |
| 93 ASSERT3U(compressed, ==, uncompressed); /* it's all metadata */ | |
| 94 dsl_dir_diduse_space(tx->tx_pool->dp_mos_dir, | |
| 95 used, compressed, uncompressed, tx); | |
| 96 dsl_dir_dirty(tx->tx_pool->dp_mos_dir, tx); | |
| 97 return; | |
| 98 } | |
| 99 dmu_buf_will_dirty(ds->ds_dbuf, tx); | |
| 100 mutex_enter(&ds->ds_lock); | |
| 101 ds->ds_phys->ds_used_bytes += used; | |
| 102 ds->ds_phys->ds_compressed_bytes += compressed; | |
| 103 ds->ds_phys->ds_uncompressed_bytes += uncompressed; | |
| 104 ds->ds_phys->ds_unique_bytes += used; | |
| 105 mutex_exit(&ds->ds_lock); | |
| 106 dsl_dir_diduse_space(ds->ds_dir, | |
| 107 used, compressed, uncompressed, tx); | |
| 108 } | |
| 109 | |
| 110 void | |
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111 dsl_dataset_block_kill(dsl_dataset_t *ds, blkptr_t *bp, zio_t *pio, |
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112 dmu_tx_t *tx) |
| 789 | 113 { |
| 2082 | 114 int used = bp_get_dasize(tx->tx_pool->dp_spa, bp); |
| 789 | 115 int compressed = BP_GET_PSIZE(bp); |
| 116 int uncompressed = BP_GET_UCSIZE(bp); | |
| 117 | |
| 118 ASSERT(dmu_tx_is_syncing(tx)); | |
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119 /* No block pointer => nothing to free */ |
| 789 | 120 if (BP_IS_HOLE(bp)) |
| 121 return; | |
| 122 | |
| 123 ASSERT(used > 0); | |
| 124 if (ds == NULL) { | |
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125 int err; |
| 789 | 126 /* |
| 127 * Account for the meta-objset space in its placeholder | |
| 128 * dataset. | |
| 129 */ | |
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130 err = arc_free(pio, tx->tx_pool->dp_spa, |
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131 tx->tx_txg, bp, NULL, NULL, pio ? ARC_NOWAIT: ARC_WAIT); |
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132 ASSERT(err == 0); |
| 789 | 133 |
| 134 dsl_dir_diduse_space(tx->tx_pool->dp_mos_dir, | |
| 135 -used, -compressed, -uncompressed, tx); | |
| 136 dsl_dir_dirty(tx->tx_pool->dp_mos_dir, tx); | |
| 137 return; | |
| 138 } | |
| 139 ASSERT3P(tx->tx_pool, ==, ds->ds_dir->dd_pool); | |
| 140 | |
| 141 dmu_buf_will_dirty(ds->ds_dbuf, tx); | |
| 142 | |
| 143 if (bp->blk_birth > ds->ds_phys->ds_prev_snap_txg) { | |
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144 int err; |
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145 |
| 789 | 146 dprintf_bp(bp, "freeing: %s", ""); |
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147 err = arc_free(pio, tx->tx_pool->dp_spa, |
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148 tx->tx_txg, bp, NULL, NULL, pio ? ARC_NOWAIT: ARC_WAIT); |
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149 ASSERT(err == 0); |
| 789 | 150 |
| 151 mutex_enter(&ds->ds_lock); | |
| 152 /* XXX unique_bytes is not accurate for head datasets */ | |
| 153 /* ASSERT3U(ds->ds_phys->ds_unique_bytes, >=, used); */ | |
| 154 ds->ds_phys->ds_unique_bytes -= used; | |
| 155 mutex_exit(&ds->ds_lock); | |
| 156 dsl_dir_diduse_space(ds->ds_dir, | |
| 157 -used, -compressed, -uncompressed, tx); | |
| 158 } else { | |
| 159 dprintf_bp(bp, "putting on dead list: %s", ""); | |
| 1544 | 160 VERIFY(0 == bplist_enqueue(&ds->ds_deadlist, bp, tx)); |
| 789 | 161 /* if (bp->blk_birth > prev prev snap txg) prev unique += bs */ |
| 162 if (ds->ds_phys->ds_prev_snap_obj != 0) { | |
| 163 ASSERT3U(ds->ds_prev->ds_object, ==, | |
| 164 ds->ds_phys->ds_prev_snap_obj); | |
| 165 ASSERT(ds->ds_prev->ds_phys->ds_num_children > 0); | |
| 166 if (ds->ds_prev->ds_phys->ds_next_snap_obj == | |
| 2082 | 167 ds->ds_object && bp->blk_birth > |
| 789 | 168 ds->ds_prev->ds_phys->ds_prev_snap_txg) { |
| 169 dmu_buf_will_dirty(ds->ds_prev->ds_dbuf, tx); | |
| 170 mutex_enter(&ds->ds_prev->ds_lock); | |
| 171 ds->ds_prev->ds_phys->ds_unique_bytes += | |
| 172 used; | |
| 173 mutex_exit(&ds->ds_prev->ds_lock); | |
| 174 } | |
| 175 } | |
| 176 } | |
| 177 mutex_enter(&ds->ds_lock); | |
| 178 ASSERT3U(ds->ds_phys->ds_used_bytes, >=, used); | |
| 179 ds->ds_phys->ds_used_bytes -= used; | |
| 180 ASSERT3U(ds->ds_phys->ds_compressed_bytes, >=, compressed); | |
| 181 ds->ds_phys->ds_compressed_bytes -= compressed; | |
| 182 ASSERT3U(ds->ds_phys->ds_uncompressed_bytes, >=, uncompressed); | |
| 183 ds->ds_phys->ds_uncompressed_bytes -= uncompressed; | |
| 184 mutex_exit(&ds->ds_lock); | |
| 185 } | |
| 186 | |
| 1544 | 187 uint64_t |
| 188 dsl_dataset_prev_snap_txg(dsl_dataset_t *ds) | |
| 789 | 189 { |
| 2885 | 190 uint64_t trysnap = 0; |
| 191 | |
| 789 | 192 if (ds == NULL) |
| 1544 | 193 return (0); |
| 789 | 194 /* |
| 195 * The snapshot creation could fail, but that would cause an | |
| 196 * incorrect FALSE return, which would only result in an | |
| 197 * overestimation of the amount of space that an operation would | |
| 198 * consume, which is OK. | |
| 199 * | |
| 200 * There's also a small window where we could miss a pending | |
| 201 * snapshot, because we could set the sync task in the quiescing | |
| 202 * phase. So this should only be used as a guess. | |
| 203 */ | |
| 2885 | 204 if (ds->ds_trysnap_txg > |
| 205 spa_last_synced_txg(ds->ds_dir->dd_pool->dp_spa)) | |
| 206 trysnap = ds->ds_trysnap_txg; | |
| 207 return (MAX(ds->ds_phys->ds_prev_snap_txg, trysnap)); | |
| 1544 | 208 } |
| 209 | |
| 210 int | |
| 211 dsl_dataset_block_freeable(dsl_dataset_t *ds, uint64_t blk_birth) | |
| 212 { | |
| 213 return (blk_birth > dsl_dataset_prev_snap_txg(ds)); | |
| 789 | 214 } |
| 215 | |
| 216 /* ARGSUSED */ | |
| 217 static void | |
| 218 dsl_dataset_evict(dmu_buf_t *db, void *dsv) | |
| 219 { | |
| 220 dsl_dataset_t *ds = dsv; | |
| 221 dsl_pool_t *dp = ds->ds_dir->dd_pool; | |
| 222 | |
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223 /* open_refcount == DS_REF_MAX when deleting */ |
| 789 | 224 ASSERT(ds->ds_open_refcount == 0 || |
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225 ds->ds_open_refcount == DS_REF_MAX); |
| 789 | 226 |
| 227 dprintf_ds(ds, "evicting %s\n", ""); | |
| 228 | |
| 229 unique_remove(ds->ds_phys->ds_fsid_guid); | |
| 230 | |
| 231 if (ds->ds_user_ptr != NULL) | |
| 232 ds->ds_user_evict_func(ds, ds->ds_user_ptr); | |
| 233 | |
| 234 if (ds->ds_prev) { | |
| 235 dsl_dataset_close(ds->ds_prev, DS_MODE_NONE, ds); | |
| 236 ds->ds_prev = NULL; | |
| 237 } | |
| 238 | |
| 239 bplist_close(&ds->ds_deadlist); | |
| 240 dsl_dir_close(ds->ds_dir, ds); | |
| 241 | |
| 242 if (list_link_active(&ds->ds_synced_link)) | |
| 243 list_remove(&dp->dp_synced_objsets, ds); | |
| 244 | |
| 2856 | 245 mutex_destroy(&ds->ds_lock); |
| 246 mutex_destroy(&ds->ds_deadlist.bpl_lock); | |
| 247 | |
| 789 | 248 kmem_free(ds, sizeof (dsl_dataset_t)); |
| 249 } | |
| 250 | |
| 1544 | 251 static int |
| 789 | 252 dsl_dataset_get_snapname(dsl_dataset_t *ds) |
| 253 { | |
| 254 dsl_dataset_phys_t *headphys; | |
| 255 int err; | |
| 256 dmu_buf_t *headdbuf; | |
| 257 dsl_pool_t *dp = ds->ds_dir->dd_pool; | |
| 258 objset_t *mos = dp->dp_meta_objset; | |
| 259 | |
| 260 if (ds->ds_snapname[0]) | |
| 1544 | 261 return (0); |
| 789 | 262 if (ds->ds_phys->ds_next_snap_obj == 0) |
| 1544 | 263 return (0); |
| 789 | 264 |
| 1544 | 265 err = dmu_bonus_hold(mos, ds->ds_dir->dd_phys->dd_head_dataset_obj, |
| 266 FTAG, &headdbuf); | |
| 267 if (err) | |
| 268 return (err); | |
| 789 | 269 headphys = headdbuf->db_data; |
| 270 err = zap_value_search(dp->dp_meta_objset, | |
| 271 headphys->ds_snapnames_zapobj, ds->ds_object, ds->ds_snapname); | |
| 1544 | 272 dmu_buf_rele(headdbuf, FTAG); |
| 273 return (err); | |
| 789 | 274 } |
| 275 | |
| 1544 | 276 int |
| 789 | 277 dsl_dataset_open_obj(dsl_pool_t *dp, uint64_t dsobj, const char *snapname, |
| 1544 | 278 int mode, void *tag, dsl_dataset_t **dsp) |
| 789 | 279 { |
| 280 uint64_t weight = ds_refcnt_weight[DS_MODE_LEVEL(mode)]; | |
| 281 objset_t *mos = dp->dp_meta_objset; | |
| 282 dmu_buf_t *dbuf; | |
| 283 dsl_dataset_t *ds; | |
| 1544 | 284 int err; |
| 789 | 285 |
| 286 ASSERT(RW_LOCK_HELD(&dp->dp_config_rwlock) || | |
| 287 dsl_pool_sync_context(dp)); | |
| 288 | |
| 1544 | 289 err = dmu_bonus_hold(mos, dsobj, tag, &dbuf); |
| 290 if (err) | |
| 291 return (err); | |
| 789 | 292 ds = dmu_buf_get_user(dbuf); |
| 293 if (ds == NULL) { | |
| 294 dsl_dataset_t *winner; | |
| 295 | |
| 296 ds = kmem_zalloc(sizeof (dsl_dataset_t), KM_SLEEP); | |
| 297 ds->ds_dbuf = dbuf; | |
| 298 ds->ds_object = dsobj; | |
| 299 ds->ds_phys = dbuf->db_data; | |
| 300 | |
| 2856 | 301 mutex_init(&ds->ds_lock, NULL, MUTEX_DEFAULT, NULL); |
| 302 mutex_init(&ds->ds_deadlist.bpl_lock, NULL, MUTEX_DEFAULT, | |
| 303 NULL); | |
| 304 | |
| 1544 | 305 err = bplist_open(&ds->ds_deadlist, |
| 789 | 306 mos, ds->ds_phys->ds_deadlist_obj); |
| 1544 | 307 if (err == 0) { |
| 308 err = dsl_dir_open_obj(dp, | |
| 309 ds->ds_phys->ds_dir_obj, NULL, ds, &ds->ds_dir); | |
| 310 } | |
| 311 if (err) { | |
| 312 /* | |
| 313 * we don't really need to close the blist if we | |
| 314 * just opened it. | |
| 315 */ | |
| 2856 | 316 mutex_destroy(&ds->ds_lock); |
| 317 mutex_destroy(&ds->ds_deadlist.bpl_lock); | |
| 1544 | 318 kmem_free(ds, sizeof (dsl_dataset_t)); |
| 319 dmu_buf_rele(dbuf, tag); | |
| 320 return (err); | |
| 321 } | |
| 789 | 322 |
| 323 if (ds->ds_dir->dd_phys->dd_head_dataset_obj == dsobj) { | |
| 324 ds->ds_snapname[0] = '\0'; | |
| 325 if (ds->ds_phys->ds_prev_snap_obj) { | |
| 1544 | 326 err = dsl_dataset_open_obj(dp, |
| 789 | 327 ds->ds_phys->ds_prev_snap_obj, NULL, |
| 1544 | 328 DS_MODE_NONE, ds, &ds->ds_prev); |
| 789 | 329 } |
| 330 } else { | |
| 331 if (snapname) { | |
| 332 #ifdef ZFS_DEBUG | |
| 333 dsl_dataset_phys_t *headphys; | |
| 1544 | 334 dmu_buf_t *headdbuf; |
| 335 err = dmu_bonus_hold(mos, | |
| 336 ds->ds_dir->dd_phys->dd_head_dataset_obj, | |
| 337 FTAG, &headdbuf); | |
| 338 if (err == 0) { | |
| 339 headphys = headdbuf->db_data; | |
| 340 uint64_t foundobj; | |
| 341 err = zap_lookup(dp->dp_meta_objset, | |
| 342 headphys->ds_snapnames_zapobj, | |
| 343 snapname, sizeof (foundobj), 1, | |
| 344 &foundobj); | |
| 345 ASSERT3U(foundobj, ==, dsobj); | |
| 346 dmu_buf_rele(headdbuf, FTAG); | |
| 347 } | |
| 789 | 348 #endif |
| 349 (void) strcat(ds->ds_snapname, snapname); | |
| 350 } else if (zfs_flags & ZFS_DEBUG_SNAPNAMES) { | |
| 1544 | 351 err = dsl_dataset_get_snapname(ds); |
| 789 | 352 } |
| 353 } | |
| 354 | |
| 1544 | 355 if (err == 0) { |
| 356 winner = dmu_buf_set_user_ie(dbuf, ds, &ds->ds_phys, | |
| 357 dsl_dataset_evict); | |
| 358 } | |
| 359 if (err || winner) { | |
| 789 | 360 bplist_close(&ds->ds_deadlist); |
| 361 if (ds->ds_prev) { | |
| 362 dsl_dataset_close(ds->ds_prev, | |
| 363 DS_MODE_NONE, ds); | |
| 364 } | |
| 365 dsl_dir_close(ds->ds_dir, ds); | |
| 2856 | 366 mutex_destroy(&ds->ds_lock); |
| 367 mutex_destroy(&ds->ds_deadlist.bpl_lock); | |
| 789 | 368 kmem_free(ds, sizeof (dsl_dataset_t)); |
| 1544 | 369 if (err) { |
| 370 dmu_buf_rele(dbuf, tag); | |
| 371 return (err); | |
| 372 } | |
| 789 | 373 ds = winner; |
| 374 } else { | |
| 375 uint64_t new = | |
| 376 unique_insert(ds->ds_phys->ds_fsid_guid); | |
| 377 if (new != ds->ds_phys->ds_fsid_guid) { | |
| 378 /* XXX it won't necessarily be synced... */ | |
| 379 ds->ds_phys->ds_fsid_guid = new; | |
| 380 } | |
| 381 } | |
| 382 } | |
| 383 ASSERT3P(ds->ds_dbuf, ==, dbuf); | |
| 384 ASSERT3P(ds->ds_phys, ==, dbuf->db_data); | |
| 385 | |
| 386 mutex_enter(&ds->ds_lock); | |
| 387 if ((DS_MODE_LEVEL(mode) == DS_MODE_PRIMARY && | |
| 2082 | 388 (ds->ds_phys->ds_flags & DS_FLAG_INCONSISTENT) && |
| 389 !DS_MODE_IS_INCONSISTENT(mode)) || | |
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390 (ds->ds_open_refcount + weight > DS_REF_MAX)) { |
| 789 | 391 mutex_exit(&ds->ds_lock); |
| 392 dsl_dataset_close(ds, DS_MODE_NONE, tag); | |
| 1544 | 393 return (EBUSY); |
| 789 | 394 } |
| 395 ds->ds_open_refcount += weight; | |
| 396 mutex_exit(&ds->ds_lock); | |
| 397 | |
| 1544 | 398 *dsp = ds; |
| 399 return (0); | |
| 789 | 400 } |
| 401 | |
| 402 int | |
| 403 dsl_dataset_open_spa(spa_t *spa, const char *name, int mode, | |
| 404 void *tag, dsl_dataset_t **dsp) | |
| 405 { | |
| 406 dsl_dir_t *dd; | |
| 407 dsl_pool_t *dp; | |
| 408 const char *tail; | |
| 409 uint64_t obj; | |
| 410 dsl_dataset_t *ds = NULL; | |
| 411 int err = 0; | |
| 412 | |
| 1544 | 413 err = dsl_dir_open_spa(spa, name, FTAG, &dd, &tail); |
| 414 if (err) | |
| 415 return (err); | |
| 789 | 416 |
| 417 dp = dd->dd_pool; | |
| 418 obj = dd->dd_phys->dd_head_dataset_obj; | |
| 419 rw_enter(&dp->dp_config_rwlock, RW_READER); | |
| 420 if (obj == 0) { | |
| 421 /* A dataset with no associated objset */ | |
| 422 err = ENOENT; | |
| 423 goto out; | |
| 424 } | |
| 425 | |
| 426 if (tail != NULL) { | |
| 427 objset_t *mos = dp->dp_meta_objset; | |
| 428 | |
| 1544 | 429 err = dsl_dataset_open_obj(dp, obj, NULL, |
| 430 DS_MODE_NONE, tag, &ds); | |
| 431 if (err) | |
| 432 goto out; | |
| 789 | 433 obj = ds->ds_phys->ds_snapnames_zapobj; |
| 434 dsl_dataset_close(ds, DS_MODE_NONE, tag); | |
| 435 ds = NULL; | |
| 436 | |
| 437 if (tail[0] != '@') { | |
| 438 err = ENOENT; | |
| 439 goto out; | |
| 440 } | |
| 441 tail++; | |
| 442 | |
| 443 /* Look for a snapshot */ | |
| 444 if (!DS_MODE_IS_READONLY(mode)) { | |
| 445 err = EROFS; | |
| 446 goto out; | |
| 447 } | |
| 448 dprintf("looking for snapshot '%s'\n", tail); | |
| 449 err = zap_lookup(mos, obj, tail, 8, 1, &obj); | |
| 450 if (err) | |
| 451 goto out; | |
| 452 } | |
| 1544 | 453 err = dsl_dataset_open_obj(dp, obj, tail, mode, tag, &ds); |
| 789 | 454 |
| 455 out: | |
| 456 rw_exit(&dp->dp_config_rwlock); | |
| 457 dsl_dir_close(dd, FTAG); | |
| 458 | |
| 459 ASSERT3U((err == 0), ==, (ds != NULL)); | |
| 460 /* ASSERT(ds == NULL || strcmp(name, ds->ds_name) == 0); */ | |
| 461 | |
| 462 *dsp = ds; | |
| 463 return (err); | |
| 464 } | |
| 465 | |
| 466 int | |
| 467 dsl_dataset_open(const char *name, int mode, void *tag, dsl_dataset_t **dsp) | |
| 468 { | |
| 469 return (dsl_dataset_open_spa(NULL, name, mode, tag, dsp)); | |
| 470 } | |
| 471 | |
| 472 void | |
| 473 dsl_dataset_name(dsl_dataset_t *ds, char *name) | |
| 474 { | |
| 475 if (ds == NULL) { | |
| 476 (void) strcpy(name, "mos"); | |
| 477 } else { | |
| 478 dsl_dir_name(ds->ds_dir, name); | |
| 1544 | 479 VERIFY(0 == dsl_dataset_get_snapname(ds)); |
| 789 | 480 if (ds->ds_snapname[0]) { |
| 481 (void) strcat(name, "@"); | |
| 482 if (!MUTEX_HELD(&ds->ds_lock)) { | |
| 483 /* | |
| 484 * We use a "recursive" mutex so that we | |
| 485 * can call dprintf_ds() with ds_lock held. | |
| 486 */ | |
| 487 mutex_enter(&ds->ds_lock); | |
| 488 (void) strcat(name, ds->ds_snapname); | |
| 489 mutex_exit(&ds->ds_lock); | |
| 490 } else { | |
| 491 (void) strcat(name, ds->ds_snapname); | |
| 492 } | |
| 493 } | |
| 494 } | |
| 495 } | |
| 496 | |
|
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497 static int |
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498 dsl_dataset_namelen(dsl_dataset_t *ds) |
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499 { |
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500 int result; |
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501 |
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502 if (ds == NULL) { |
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503 result = 3; /* "mos" */ |
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504 } else { |
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505 result = dsl_dir_namelen(ds->ds_dir); |
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506 VERIFY(0 == dsl_dataset_get_snapname(ds)); |
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507 if (ds->ds_snapname[0]) { |
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508 ++result; /* adding one for the @-sign */ |
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509 if (!MUTEX_HELD(&ds->ds_lock)) { |
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510 /* see dsl_datset_name */ |
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511 mutex_enter(&ds->ds_lock); |
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512 result += strlen(ds->ds_snapname); |
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513 mutex_exit(&ds->ds_lock); |
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514 } else { |
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515 result += strlen(ds->ds_snapname); |
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516 } |
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517 } |
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518 } |
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519 |
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520 return (result); |
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521 } |
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522 |
| 789 | 523 void |
| 524 dsl_dataset_close(dsl_dataset_t *ds, int mode, void *tag) | |
| 525 { | |
| 526 uint64_t weight = ds_refcnt_weight[DS_MODE_LEVEL(mode)]; | |
| 527 mutex_enter(&ds->ds_lock); | |
| 528 ASSERT3U(ds->ds_open_refcount, >=, weight); | |
| 529 ds->ds_open_refcount -= weight; | |
| 530 dprintf_ds(ds, "closing mode %u refcount now 0x%llx\n", | |
| 531 mode, ds->ds_open_refcount); | |
| 532 mutex_exit(&ds->ds_lock); | |
| 533 | |
| 1544 | 534 dmu_buf_rele(ds->ds_dbuf, tag); |
| 789 | 535 } |
| 536 | |
| 537 void | |
| 538 dsl_dataset_create_root(dsl_pool_t *dp, uint64_t *ddobjp, dmu_tx_t *tx) | |
| 539 { | |
| 540 objset_t *mos = dp->dp_meta_objset; | |
| 541 dmu_buf_t *dbuf; | |
| 542 dsl_dataset_phys_t *dsphys; | |
| 543 dsl_dataset_t *ds; | |
| 544 uint64_t dsobj; | |
| 545 dsl_dir_t *dd; | |
| 546 | |
| 547 dsl_dir_create_root(mos, ddobjp, tx); | |
| 1544 | 548 VERIFY(0 == dsl_dir_open_obj(dp, *ddobjp, NULL, FTAG, &dd)); |
| 789 | 549 |
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550 dsobj = dmu_object_alloc(mos, DMU_OT_DSL_DATASET, 0, |
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551 DMU_OT_DSL_DATASET, sizeof (dsl_dataset_phys_t), tx); |
| 1544 | 552 VERIFY(0 == dmu_bonus_hold(mos, dsobj, FTAG, &dbuf)); |
| 789 | 553 dmu_buf_will_dirty(dbuf, tx); |
| 554 dsphys = dbuf->db_data; | |
| 555 dsphys->ds_dir_obj = dd->dd_object; | |
| 556 dsphys->ds_fsid_guid = unique_create(); | |
| 1544 | 557 unique_remove(dsphys->ds_fsid_guid); /* it isn't open yet */ |
| 789 | 558 (void) random_get_pseudo_bytes((void*)&dsphys->ds_guid, |
| 559 sizeof (dsphys->ds_guid)); | |
| 560 dsphys->ds_snapnames_zapobj = | |
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561 zap_create(mos, DMU_OT_DSL_DS_SNAP_MAP, DMU_OT_NONE, 0, tx); |
| 789 | 562 dsphys->ds_creation_time = gethrestime_sec(); |
| 563 dsphys->ds_creation_txg = tx->tx_txg; | |
| 564 dsphys->ds_deadlist_obj = | |
| 565 bplist_create(mos, DSL_DEADLIST_BLOCKSIZE, tx); | |
| 1544 | 566 dmu_buf_rele(dbuf, FTAG); |
| 789 | 567 |
| 568 dmu_buf_will_dirty(dd->dd_dbuf, tx); | |
| 569 dd->dd_phys->dd_head_dataset_obj = dsobj; | |
| 570 dsl_dir_close(dd, FTAG); | |
| 571 | |
| 1544 | 572 VERIFY(0 == |
| 573 dsl_dataset_open_obj(dp, dsobj, NULL, DS_MODE_NONE, FTAG, &ds)); | |
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574 (void) dmu_objset_create_impl(dp->dp_spa, ds, |
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575 &ds->ds_phys->ds_bp, DMU_OST_ZFS, tx); |
| 789 | 576 dsl_dataset_close(ds, DS_MODE_NONE, FTAG); |
| 577 } | |
| 578 | |
| 2199 | 579 uint64_t |
| 580 dsl_dataset_create_sync(dsl_dir_t *pdd, | |
| 789 | 581 const char *lastname, dsl_dataset_t *clone_parent, dmu_tx_t *tx) |
| 582 { | |
| 2199 | 583 dsl_pool_t *dp = pdd->dd_pool; |
| 789 | 584 dmu_buf_t *dbuf; |
| 585 dsl_dataset_phys_t *dsphys; | |
| 2199 | 586 uint64_t dsobj, ddobj; |
| 789 | 587 objset_t *mos = dp->dp_meta_objset; |
| 588 dsl_dir_t *dd; | |
| 589 | |
| 2199 | 590 ASSERT(clone_parent == NULL || clone_parent->ds_dir->dd_pool == dp); |
| 591 ASSERT(clone_parent == NULL || | |
| 592 clone_parent->ds_phys->ds_num_children > 0); | |
| 789 | 593 ASSERT(lastname[0] != '@'); |
| 594 ASSERT(dmu_tx_is_syncing(tx)); | |
| 595 | |
| 2199 | 596 ddobj = dsl_dir_create_sync(pdd, lastname, tx); |
| 597 VERIFY(0 == dsl_dir_open_obj(dp, ddobj, lastname, FTAG, &dd)); | |
| 789 | 598 |
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599 dsobj = dmu_object_alloc(mos, DMU_OT_DSL_DATASET, 0, |
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600 DMU_OT_DSL_DATASET, sizeof (dsl_dataset_phys_t), tx); |
| 1544 | 601 VERIFY(0 == dmu_bonus_hold(mos, dsobj, FTAG, &dbuf)); |
| 789 | 602 dmu_buf_will_dirty(dbuf, tx); |
| 603 dsphys = dbuf->db_data; | |
| 604 dsphys->ds_dir_obj = dd->dd_object; | |
| 605 dsphys->ds_fsid_guid = unique_create(); | |
| 606 unique_remove(dsphys->ds_fsid_guid); /* it isn't open yet */ | |
| 607 (void) random_get_pseudo_bytes((void*)&dsphys->ds_guid, | |
| 608 sizeof (dsphys->ds_guid)); | |
| 609 dsphys->ds_snapnames_zapobj = | |
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610 zap_create(mos, DMU_OT_DSL_DS_SNAP_MAP, DMU_OT_NONE, 0, tx); |
| 789 | 611 dsphys->ds_creation_time = gethrestime_sec(); |
| 612 dsphys->ds_creation_txg = tx->tx_txg; | |
| 613 dsphys->ds_deadlist_obj = | |
| 614 bplist_create(mos, DSL_DEADLIST_BLOCKSIZE, tx); | |
| 615 if (clone_parent) { | |
| 616 dsphys->ds_prev_snap_obj = clone_parent->ds_object; | |
| 617 dsphys->ds_prev_snap_txg = | |
| 618 clone_parent->ds_phys->ds_creation_txg; | |
| 619 dsphys->ds_used_bytes = | |
| 620 clone_parent->ds_phys->ds_used_bytes; | |
| 621 dsphys->ds_compressed_bytes = | |
| 622 clone_parent->ds_phys->ds_compressed_bytes; | |
| 623 dsphys->ds_uncompressed_bytes = | |
| 624 clone_parent->ds_phys->ds_uncompressed_bytes; | |
| 625 dsphys->ds_bp = clone_parent->ds_phys->ds_bp; | |
| 626 | |
| 627 dmu_buf_will_dirty(clone_parent->ds_dbuf, tx); | |
| 628 clone_parent->ds_phys->ds_num_children++; | |
| 629 | |
| 630 dmu_buf_will_dirty(dd->dd_dbuf, tx); | |
| 631 dd->dd_phys->dd_clone_parent_obj = clone_parent->ds_object; | |
| 632 } | |
| 1544 | 633 dmu_buf_rele(dbuf, FTAG); |
| 789 | 634 |
| 635 dmu_buf_will_dirty(dd->dd_dbuf, tx); | |
| 636 dd->dd_phys->dd_head_dataset_obj = dsobj; | |
| 637 dsl_dir_close(dd, FTAG); | |
| 638 | |
| 2199 | 639 return (dsobj); |
| 640 } | |
| 641 | |
| 642 struct destroyarg { | |
| 643 dsl_sync_task_group_t *dstg; | |
| 644 char *snapname; | |
| 645 char *failed; | |
| 646 }; | |
| 647 | |
| 648 static int | |
| 649 dsl_snapshot_destroy_one(char *name, void *arg) | |
| 650 { | |
| 651 struct destroyarg *da = arg; | |
| 652 dsl_dataset_t *ds; | |
| 653 char *cp; | |
| 654 int err; | |
| 655 | |
| 656 (void) strcat(name, "@"); | |
| 657 (void) strcat(name, da->snapname); | |
| 658 err = dsl_dataset_open(name, | |
| 659 DS_MODE_EXCLUSIVE | DS_MODE_READONLY | DS_MODE_INCONSISTENT, | |
| 4007 | 660 da->dstg, &ds); |
| 2199 | 661 cp = strchr(name, '@'); |
| 662 *cp = '\0'; | |
| 663 if (err == ENOENT) | |
| 664 return (0); | |
| 665 if (err) { | |
| 666 (void) strcpy(da->failed, name); | |
| 667 return (err); | |
| 668 } | |
| 669 | |
| 670 dsl_sync_task_create(da->dstg, dsl_dataset_destroy_check, | |
| 4007 | 671 dsl_dataset_destroy_sync, ds, da->dstg, 0); |
| 789 | 672 return (0); |
| 673 } | |
| 674 | |
| 2199 | 675 /* |
| 676 * Destroy 'snapname' in all descendants of 'fsname'. | |
| 677 */ | |
| 678 #pragma weak dmu_snapshots_destroy = dsl_snapshots_destroy | |
| 679 int | |
| 680 dsl_snapshots_destroy(char *fsname, char *snapname) | |
| 681 { | |
| 682 int err; | |
| 683 struct destroyarg da; | |
| 684 dsl_sync_task_t *dst; | |
| 685 spa_t *spa; | |
| 686 char *cp; | |
| 687 | |
| 688 cp = strchr(fsname, '/'); | |
| 689 if (cp) { | |
| 690 *cp = '\0'; | |
| 691 err = spa_open(fsname, &spa, FTAG); | |
| 692 *cp = '/'; | |
| 693 } else { | |
| 694 err = spa_open(fsname, &spa, FTAG); | |
| 695 } | |
| 696 if (err) | |
| 697 return (err); | |
| 698 da.dstg = dsl_sync_task_group_create(spa_get_dsl(spa)); | |
| 699 da.snapname = snapname; | |
| 700 da.failed = fsname; | |
| 701 | |
| 702 err = dmu_objset_find(fsname, | |
| 2417 | 703 dsl_snapshot_destroy_one, &da, DS_FIND_CHILDREN); |
| 2199 | 704 |
| 705 if (err == 0) | |
| 706 err = dsl_sync_task_group_wait(da.dstg); | |
| 707 | |
| 708 for (dst = list_head(&da.dstg->dstg_tasks); dst; | |
| 709 dst = list_next(&da.dstg->dstg_tasks, dst)) { | |
| 710 dsl_dataset_t *ds = dst->dst_arg1; | |
| 711 if (dst->dst_err) { | |
| 712 dsl_dataset_name(ds, fsname); | |
| 713 cp = strchr(fsname, '@'); | |
| 714 *cp = '\0'; | |
| 715 } | |
| 716 /* | |
| 717 * If it was successful, destroy_sync would have | |
| 718 * closed the ds | |
| 719 */ | |
| 720 if (err) | |
| 4007 | 721 dsl_dataset_close(ds, DS_MODE_EXCLUSIVE, da.dstg); |
| 2199 | 722 } |
| 723 | |
| 724 dsl_sync_task_group_destroy(da.dstg); | |
| 725 spa_close(spa, FTAG); | |
| 726 return (err); | |
| 727 } | |
| 728 | |
| 789 | 729 int |
| 730 dsl_dataset_destroy(const char *name) | |
| 731 { | |
| 732 int err; | |
| 2199 | 733 dsl_sync_task_group_t *dstg; |
| 734 objset_t *os; | |
| 735 dsl_dataset_t *ds; | |
| 789 | 736 dsl_dir_t *dd; |
| 2199 | 737 uint64_t obj; |
| 738 | |
| 739 if (strchr(name, '@')) { | |
| 740 /* Destroying a snapshot is simpler */ | |
| 741 err = dsl_dataset_open(name, | |
| 742 DS_MODE_EXCLUSIVE | DS_MODE_READONLY | DS_MODE_INCONSISTENT, | |
| 743 FTAG, &ds); | |
| 744 if (err) | |
| 745 return (err); | |
| 746 err = dsl_sync_task_do(ds->ds_dir->dd_pool, | |
| 747 dsl_dataset_destroy_check, dsl_dataset_destroy_sync, | |
| 748 ds, FTAG, 0); | |
| 749 if (err) | |
| 750 dsl_dataset_close(ds, DS_MODE_EXCLUSIVE, FTAG); | |
| 751 return (err); | |
| 752 } | |
| 753 | |
| 754 err = dmu_objset_open(name, DMU_OST_ANY, | |
| 755 DS_MODE_EXCLUSIVE | DS_MODE_INCONSISTENT, &os); | |
| 756 if (err) | |
| 757 return (err); | |
| 758 ds = os->os->os_dsl_dataset; | |
| 759 dd = ds->ds_dir; | |
| 789 | 760 |
| 2199 | 761 /* |
| 762 * Check for errors and mark this ds as inconsistent, in | |
| 763 * case we crash while freeing the objects. | |
| 764 */ | |
| 765 err = dsl_sync_task_do(dd->dd_pool, dsl_dataset_destroy_begin_check, | |
| 766 dsl_dataset_destroy_begin_sync, ds, NULL, 0); | |
| 767 if (err) { | |
| 768 dmu_objset_close(os); | |
| 769 return (err); | |
| 770 } | |
| 771 | |
| 772 /* | |
| 773 * remove the objects in open context, so that we won't | |
| 774 * have too much to do in syncing context. | |
| 775 */ | |
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776 for (obj = 0; err == 0; err = dmu_object_next(os, &obj, FALSE, |
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777 ds->ds_phys->ds_prev_snap_txg)) { |
| 2199 | 778 dmu_tx_t *tx = dmu_tx_create(os); |
| 779 dmu_tx_hold_free(tx, obj, 0, DMU_OBJECT_END); | |
| 780 dmu_tx_hold_bonus(tx, obj); | |
| 781 err = dmu_tx_assign(tx, TXG_WAIT); | |
| 782 if (err) { | |
| 783 /* | |
| 784 * Perhaps there is not enough disk | |
| 785 * space. Just deal with it from | |
| 786 * dsl_dataset_destroy_sync(). | |
| 787 */ | |
| 788 dmu_tx_abort(tx); | |
| 789 continue; | |
| 790 } | |
| 791 VERIFY(0 == dmu_object_free(os, obj, tx)); | |
| 792 dmu_tx_commit(tx); | |
| 793 } | |
| 794 /* Make sure it's not dirty before we finish destroying it. */ | |
| 795 txg_wait_synced(dd->dd_pool, 0); | |
| 796 | |
| 797 dmu_objset_close(os); | |
| 798 if (err != ESRCH) | |
| 799 return (err); | |
| 800 | |
| 801 err = dsl_dataset_open(name, | |
| 802 DS_MODE_EXCLUSIVE | DS_MODE_READONLY | DS_MODE_INCONSISTENT, | |
| 803 FTAG, &ds); | |
| 1544 | 804 if (err) |
| 805 return (err); | |
| 789 | 806 |
| 2199 | 807 err = dsl_dir_open(name, FTAG, &dd, NULL); |
| 808 if (err) { | |
| 809 dsl_dataset_close(ds, DS_MODE_EXCLUSIVE, FTAG); | |
| 810 return (err); | |
| 789 | 811 } |
| 812 | |
| 2199 | 813 /* |
| 814 * Blow away the dsl_dir + head dataset. | |
| 815 */ | |
| 816 dstg = dsl_sync_task_group_create(ds->ds_dir->dd_pool); | |
| 817 dsl_sync_task_create(dstg, dsl_dataset_destroy_check, | |
| 818 dsl_dataset_destroy_sync, ds, FTAG, 0); | |
| 819 dsl_sync_task_create(dstg, dsl_dir_destroy_check, | |
| 820 dsl_dir_destroy_sync, dd, FTAG, 0); | |
| 821 err = dsl_sync_task_group_wait(dstg); | |
| 822 dsl_sync_task_group_destroy(dstg); | |
| 823 /* if it is successful, *destroy_sync will close the ds+dd */ | |
| 824 if (err) { | |
| 825 dsl_dataset_close(ds, DS_MODE_EXCLUSIVE, FTAG); | |
| 826 dsl_dir_close(dd, FTAG); | |
| 827 } | |
| 789 | 828 return (err); |
| 829 } | |
| 830 | |
| 831 int | |
| 2199 | 832 dsl_dataset_rollback(dsl_dataset_t *ds) |
| 789 | 833 { |
|
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834 ASSERT3U(ds->ds_open_refcount, ==, DS_REF_MAX); |
| 2199 | 835 return (dsl_sync_task_do(ds->ds_dir->dd_pool, |
| 836 dsl_dataset_rollback_check, dsl_dataset_rollback_sync, | |
| 837 ds, NULL, 0)); | |
| 789 | 838 } |
| 839 | |
| 840 void * | |
| 841 dsl_dataset_set_user_ptr(dsl_dataset_t *ds, | |
| 842 void *p, dsl_dataset_evict_func_t func) | |
| 843 { | |
| 844 void *old; | |
| 845 | |
| 846 mutex_enter(&ds->ds_lock); | |
| 847 old = ds->ds_user_ptr; | |
| 848 if (old == NULL) { | |
| 849 ds->ds_user_ptr = p; | |
| 850 ds->ds_user_evict_func = func; | |
| 851 } | |
| 852 mutex_exit(&ds->ds_lock); | |
| 853 return (old); | |
| 854 } | |
| 855 | |
| 856 void * | |
| 857 dsl_dataset_get_user_ptr(dsl_dataset_t *ds) | |
| 858 { | |
| 859 return (ds->ds_user_ptr); | |
| 860 } | |
| 861 | |
| 862 | |
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863 blkptr_t * |
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864 dsl_dataset_get_blkptr(dsl_dataset_t *ds) |
| 789 | 865 { |
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866 return (&ds->ds_phys->ds_bp); |
| 789 | 867 } |
| 868 | |
| 869 void | |
| 870 dsl_dataset_set_blkptr(dsl_dataset_t *ds, blkptr_t *bp, dmu_tx_t *tx) | |
| 871 { | |
| 872 ASSERT(dmu_tx_is_syncing(tx)); | |
| 873 /* If it's the meta-objset, set dp_meta_rootbp */ | |
| 874 if (ds == NULL) { | |
| 875 tx->tx_pool->dp_meta_rootbp = *bp; | |
| 876 } else { | |
| 877 dmu_buf_will_dirty(ds->ds_dbuf, tx); | |
| 878 ds->ds_phys->ds_bp = *bp; | |
| 879 } | |
| 880 } | |
| 881 | |
| 882 spa_t * | |
| 883 dsl_dataset_get_spa(dsl_dataset_t *ds) | |
| 884 { | |
| 885 return (ds->ds_dir->dd_pool->dp_spa); | |
| 886 } | |
| 887 | |
| 888 void | |
| 889 dsl_dataset_dirty(dsl_dataset_t *ds, dmu_tx_t *tx) | |
| 890 { | |
| 891 dsl_pool_t *dp; | |
| 892 | |
| 893 if (ds == NULL) /* this is the meta-objset */ | |
| 894 return; | |
| 895 | |
| 896 ASSERT(ds->ds_user_ptr != NULL); | |
| 2885 | 897 |
| 898 if (ds->ds_phys->ds_next_snap_obj != 0) | |
| 899 panic("dirtying snapshot!"); | |
| 789 | 900 |
| 901 dp = ds->ds_dir->dd_pool; | |
| 902 | |
| 903 if (txg_list_add(&dp->dp_dirty_datasets, ds, tx->tx_txg) == 0) { | |
| 904 /* up the hold count until we can be written out */ | |
| 905 dmu_buf_add_ref(ds->ds_dbuf, ds); | |
| 906 } | |
| 907 } | |
| 908 | |
| 909 struct killarg { | |
| 910 uint64_t *usedp; | |
| 911 uint64_t *compressedp; | |
| 912 uint64_t *uncompressedp; | |
| 913 zio_t *zio; | |
| 914 dmu_tx_t *tx; | |
| 915 }; | |
| 916 | |
| 917 static int | |
| 918 kill_blkptr(traverse_blk_cache_t *bc, spa_t *spa, void *arg) | |
| 919 { | |
| 920 struct killarg *ka = arg; | |
| 921 blkptr_t *bp = &bc->bc_blkptr; | |
| 922 | |
| 923 ASSERT3U(bc->bc_errno, ==, 0); | |
| 924 | |
| 925 /* | |
| 926 * Since this callback is not called concurrently, no lock is | |
| 927 * needed on the accounting values. | |
| 928 */ | |
| 2082 | 929 *ka->usedp += bp_get_dasize(spa, bp); |
| 789 | 930 *ka->compressedp += BP_GET_PSIZE(bp); |
| 931 *ka->uncompressedp += BP_GET_UCSIZE(bp); | |
| 932 /* XXX check for EIO? */ | |
| 933 (void) arc_free(ka->zio, spa, ka->tx->tx_txg, bp, NULL, NULL, | |
| 934 ARC_NOWAIT); | |
| 935 return (0); | |
| 936 } | |
| 937 | |
| 938 /* ARGSUSED */ | |
| 2199 | 939 static int |
| 940 dsl_dataset_rollback_check(void *arg1, void *arg2, dmu_tx_t *tx) | |
| 789 | 941 { |
| 2199 | 942 dsl_dataset_t *ds = arg1; |
| 789 | 943 |
| 2199 | 944 /* |
| 945 * There must be a previous snapshot. I suppose we could roll | |
| 946 * it back to being empty (and re-initialize the upper (ZPL) | |
| 947 * layer). But for now there's no way to do this via the user | |
| 948 * interface. | |
| 949 */ | |
| 950 if (ds->ds_phys->ds_prev_snap_txg == 0) | |
| 789 | 951 return (EINVAL); |
| 952 | |
| 2199 | 953 /* |
| 954 * This must not be a snapshot. | |
| 955 */ | |
| 956 if (ds->ds_phys->ds_next_snap_obj != 0) | |
| 957 return (EINVAL); | |
| 789 | 958 |
| 959 /* | |
| 960 * If we made changes this txg, traverse_dsl_dataset won't find | |
| 961 * them. Try again. | |
| 962 */ | |
| 2199 | 963 if (ds->ds_phys->ds_bp.blk_birth >= tx->tx_txg) |
| 789 | 964 return (EAGAIN); |
| 2199 | 965 |
| 966 return (0); | |
| 967 } | |
| 789 | 968 |
| 2199 | 969 /* ARGSUSED */ |
| 970 static void | |
| 4543 | 971 dsl_dataset_rollback_sync(void *arg1, void *arg2, cred_t *cr, dmu_tx_t *tx) |
| 2199 | 972 { |
| 973 dsl_dataset_t *ds = arg1; | |
| 974 objset_t *mos = ds->ds_dir->dd_pool->dp_meta_objset; | |
| 789 | 975 |
| 976 dmu_buf_will_dirty(ds->ds_dbuf, tx); | |
| 977 | |
| 978 /* Zero out the deadlist. */ | |
| 979 bplist_close(&ds->ds_deadlist); | |
| 980 bplist_destroy(mos, ds->ds_phys->ds_deadlist_obj, tx); | |
| 981 ds->ds_phys->ds_deadlist_obj = | |
| 982 bplist_create(mos, DSL_DEADLIST_BLOCKSIZE, tx); | |
| 1544 | 983 VERIFY(0 == bplist_open(&ds->ds_deadlist, mos, |
| 984 ds->ds_phys->ds_deadlist_obj)); | |
| 789 | 985 |
| 986 { | |
| 987 /* Free blkptrs that we gave birth to */ | |
| 988 zio_t *zio; | |
| 989 uint64_t used = 0, compressed = 0, uncompressed = 0; | |
| 990 struct killarg ka; | |
| 991 | |
| 992 zio = zio_root(tx->tx_pool->dp_spa, NULL, NULL, | |
| 993 ZIO_FLAG_MUSTSUCCEED); | |
| 994 ka.usedp = &used; | |
| 995 ka.compressedp = &compressed; | |
| 996 ka.uncompressedp = &uncompressed; | |
| 997 ka.zio = zio; | |
| 998 ka.tx = tx; | |
| 999 (void) traverse_dsl_dataset(ds, ds->ds_phys->ds_prev_snap_txg, | |
| 1000 ADVANCE_POST, kill_blkptr, &ka); | |
| 1001 (void) zio_wait(zio); | |
| 1002 | |
| 2199 | 1003 dsl_dir_diduse_space(ds->ds_dir, |
| 789 | 1004 -used, -compressed, -uncompressed, tx); |
| 1005 } | |
| 1006 | |
| 2199 | 1007 /* Change our contents to that of the prev snapshot */ |
| 789 | 1008 ASSERT3U(ds->ds_prev->ds_object, ==, ds->ds_phys->ds_prev_snap_obj); |
| 1009 ds->ds_phys->ds_bp = ds->ds_prev->ds_phys->ds_bp; | |
| 1010 ds->ds_phys->ds_used_bytes = ds->ds_prev->ds_phys->ds_used_bytes; | |
| 1011 ds->ds_phys->ds_compressed_bytes = | |
| 1012 ds->ds_prev->ds_phys->ds_compressed_bytes; | |
| 1013 ds->ds_phys->ds_uncompressed_bytes = | |
| 1014 ds->ds_prev->ds_phys->ds_uncompressed_bytes; | |
| 2082 | 1015 ds->ds_phys->ds_flags = ds->ds_prev->ds_phys->ds_flags; |
| 789 | 1016 ds->ds_phys->ds_unique_bytes = 0; |
| 1017 | |
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1018 if (ds->ds_prev->ds_phys->ds_next_snap_obj == ds->ds_object) { |
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1019 dmu_buf_will_dirty(ds->ds_prev->ds_dbuf, tx); |
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1020 ds->ds_prev->ds_phys->ds_unique_bytes = 0; |
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1021 } |
| 4543 | 1022 |
| 1023 spa_history_internal_log(LOG_DS_ROLLBACK, ds->ds_dir->dd_pool->dp_spa, | |
| 1024 tx, cr, "dataset = %llu", ds->ds_object); | |
| 789 | 1025 } |
| 1026 | |
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1027 /* ARGSUSED */ |
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1028 static int |
| 2199 | 1029 dsl_dataset_destroy_begin_check(void *arg1, void *arg2, dmu_tx_t *tx) |
|
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1030 { |
| 2199 | 1031 dsl_dataset_t *ds = arg1; |
|
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1032 |
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1033 /* |
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1034 * Can't delete a head dataset if there are snapshots of it. |
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1035 * (Except if the only snapshots are from the branch we cloned |
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1036 * from.) |
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1037 */ |
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1038 if (ds->ds_prev != NULL && |
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1039 ds->ds_prev->ds_phys->ds_next_snap_obj == ds->ds_object) |
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1040 return (EINVAL); |
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1041 |
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1042 return (0); |
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1043 } |
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1044 |
| 2199 | 1045 /* ARGSUSED */ |
| 1046 static void | |
| 4543 | 1047 dsl_dataset_destroy_begin_sync(void *arg1, void *arg2, cred_t *cr, dmu_tx_t *tx) |
| 789 | 1048 { |
| 2199 | 1049 dsl_dataset_t *ds = arg1; |
| 4543 | 1050 dsl_pool_t *dp = ds->ds_dir->dd_pool; |
| 789 | 1051 |
| 2199 | 1052 /* Mark it as inconsistent on-disk, in case we crash */ |
| 1053 dmu_buf_will_dirty(ds->ds_dbuf, tx); | |
| 1054 ds->ds_phys->ds_flags |= DS_FLAG_INCONSISTENT; | |
| 4543 | 1055 |
| 1056 spa_history_internal_log(LOG_DS_DESTROY_BEGIN, dp->dp_spa, tx, | |
| 1057 cr, "dataset = %llu", ds->ds_object); | |
| 2199 | 1058 } |
| 789 | 1059 |
| 2199 | 1060 /* ARGSUSED */ |
| 1061 static int | |
| 1062 dsl_dataset_destroy_check(void *arg1, void *arg2, dmu_tx_t *tx) | |
| 1063 { | |
| 1064 dsl_dataset_t *ds = arg1; | |
| 789 | 1065 |
| 1066 /* Can't delete a branch point. */ | |
| 2199 | 1067 if (ds->ds_phys->ds_num_children > 1) |
| 1068 return (EEXIST); | |
| 789 | 1069 |
| 1070 /* | |
| 1071 * Can't delete a head dataset if there are snapshots of it. | |
| 1072 * (Except if the only snapshots are from the branch we cloned | |
| 1073 * from.) | |
| 1074 */ | |
| 1075 if (ds->ds_prev != NULL && | |
| 2199 | 1076 ds->ds_prev->ds_phys->ds_next_snap_obj == ds->ds_object) |
| 789 | 1077 return (EINVAL); |
| 1078 | |
| 1079 /* | |
| 1080 * If we made changes this txg, traverse_dsl_dataset won't find | |
| 1081 * them. Try again. | |
| 1082 */ | |
| 2199 | 1083 if (ds->ds_phys->ds_bp.blk_birth >= tx->tx_txg) |
| 789 | 1084 return (EAGAIN); |
| 2199 | 1085 |
| 1086 /* XXX we should do some i/o error checking... */ | |
| 1087 return (0); | |
| 1088 } | |
| 1089 | |
| 1090 static void | |
| 4543 | 1091 dsl_dataset_destroy_sync(void *arg1, void *tag, cred_t *cr, dmu_tx_t *tx) |
| 2199 | 1092 { |
| 1093 dsl_dataset_t *ds = arg1; | |
| 1094 uint64_t used = 0, compressed = 0, uncompressed = 0; | |
| 1095 zio_t *zio; | |
| 1096 int err; | |
| 1097 int after_branch_point = FALSE; | |
| 1098 dsl_pool_t *dp = ds->ds_dir->dd_pool; | |
| 1099 objset_t *mos = dp->dp_meta_objset; | |
| 1100 dsl_dataset_t *ds_prev = NULL; | |
| 1101 uint64_t obj; | |
| 1102 | |
|
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1103 ASSERT3U(ds->ds_open_refcount, ==, DS_REF_MAX); |
| 2199 | 1104 ASSERT3U(ds->ds_phys->ds_num_children, <=, 1); |
| 1105 ASSERT(ds->ds_prev == NULL || | |
| 1106 ds->ds_prev->ds_phys->ds_next_snap_obj != ds->ds_object); | |
| 1107 ASSERT3U(ds->ds_phys->ds_bp.blk_birth, <=, tx->tx_txg); | |
| 1108 | |
| 1109 ASSERT(RW_WRITE_HELD(&dp->dp_config_rwlock)); | |
| 1110 | |
| 1111 obj = ds->ds_object; | |
| 789 | 1112 |
| 1113 if (ds->ds_phys->ds_prev_snap_obj != 0) { | |
| 1114 if (ds->ds_prev) { | |
| 1115 ds_prev = ds->ds_prev; | |
| 1116 } else { | |
| 2199 | 1117 VERIFY(0 == dsl_dataset_open_obj(dp, |
| 789 | 1118 ds->ds_phys->ds_prev_snap_obj, NULL, |
| 2199 | 1119 DS_MODE_NONE, FTAG, &ds_prev)); |
| 789 | 1120 } |
| 1121 after_branch_point = | |
| 1122 (ds_prev->ds_phys->ds_next_snap_obj != obj); | |
| 1123 | |
| 1124 dmu_buf_will_dirty(ds_prev->ds_dbuf, tx); | |
| 1125 if (after_branch_point && | |
| 1126 ds->ds_phys->ds_next_snap_obj == 0) { | |
| 1127 /* This clone is toast. */ | |
| 1128 ASSERT(ds_prev->ds_phys->ds_num_children > 1); | |
| 1129 ds_prev->ds_phys->ds_num_children--; | |
| 1130 } else if (!after_branch_point) { | |
| 1131 ds_prev->ds_phys->ds_next_snap_obj = | |
| 1132 ds->ds_phys->ds_next_snap_obj; | |
| 1133 } | |
| 1134 } | |
| 1135 | |
| 1136 zio = zio_root(dp->dp_spa, NULL, NULL, ZIO_FLAG_MUSTSUCCEED); | |
| 1137 | |
| 1138 if (ds->ds_phys->ds_next_snap_obj != 0) { | |
| 2199 | 1139 blkptr_t bp; |
| 789 | 1140 dsl_dataset_t *ds_next; |
| 1141 uint64_t itor = 0; | |
| 1142 | |
| 1143 spa_scrub_restart(dp->dp_spa, tx->tx_txg); | |
| 1144 | |
| 2199 | 1145 VERIFY(0 == dsl_dataset_open_obj(dp, |
| 1544 | 1146 ds->ds_phys->ds_next_snap_obj, NULL, |
| 1147 DS_MODE_NONE, FTAG, &ds_next)); | |
| 789 | 1148 ASSERT3U(ds_next->ds_phys->ds_prev_snap_obj, ==, obj); |
| 1149 | |
| 1150 dmu_buf_will_dirty(ds_next->ds_dbuf, tx); | |
| 1151 ds_next->ds_phys->ds_prev_snap_obj = | |
| 1152 ds->ds_phys->ds_prev_snap_obj; | |
| 1153 ds_next->ds_phys->ds_prev_snap_txg = | |
| 1154 ds->ds_phys->ds_prev_snap_txg; | |
| 1155 ASSERT3U(ds->ds_phys->ds_prev_snap_txg, ==, | |
| 1156 ds_prev ? ds_prev->ds_phys->ds_creation_txg : 0); | |
| 1157 | |
| 1158 /* | |
| 1159 * Transfer to our deadlist (which will become next's | |
| 1160 * new deadlist) any entries from next's current | |
| 1161 * deadlist which were born before prev, and free the | |
| 1162 * other entries. | |
| 1163 * | |
| 1164 * XXX we're doing this long task with the config lock held | |
| 1165 */ | |
| 1166 while (bplist_iterate(&ds_next->ds_deadlist, &itor, | |
| 1167 &bp) == 0) { | |
| 1168 if (bp.blk_birth <= ds->ds_phys->ds_prev_snap_txg) { | |
| 1544 | 1169 VERIFY(0 == bplist_enqueue(&ds->ds_deadlist, |
| 1170 &bp, tx)); | |
| 789 | 1171 if (ds_prev && !after_branch_point && |
| 1172 bp.blk_birth > | |
| 1173 ds_prev->ds_phys->ds_prev_snap_txg) { | |
| 1174 ds_prev->ds_phys->ds_unique_bytes += | |
| 2082 | 1175 bp_get_dasize(dp->dp_spa, &bp); |
| 789 | 1176 } |
| 1177 } else { | |
| 2082 | 1178 used += bp_get_dasize(dp->dp_spa, &bp); |
| 789 | 1179 compressed += BP_GET_PSIZE(&bp); |
| 1180 uncompressed += BP_GET_UCSIZE(&bp); | |
| 1181 /* XXX check return value? */ | |
| 1182 (void) arc_free(zio, dp->dp_spa, tx->tx_txg, | |
| 1183 &bp, NULL, NULL, ARC_NOWAIT); | |
| 1184 } | |
| 1185 } | |
| 1186 | |
| 1187 /* free next's deadlist */ | |
| 1188 bplist_close(&ds_next->ds_deadlist); | |
| 1189 bplist_destroy(mos, ds_next->ds_phys->ds_deadlist_obj, tx); | |
| 1190 | |
| 1191 /* set next's deadlist to our deadlist */ | |
| 1192 ds_next->ds_phys->ds_deadlist_obj = | |
| 1193 ds->ds_phys->ds_deadlist_obj; | |
| 1544 | 1194 VERIFY(0 == bplist_open(&ds_next->ds_deadlist, mos, |
| 1195 ds_next->ds_phys->ds_deadlist_obj)); | |
| 789 | 1196 ds->ds_phys->ds_deadlist_obj = 0; |
| 1197 | |
| 1198 if (ds_next->ds_phys->ds_next_snap_obj != 0) { | |
| 1199 /* | |
| 1200 * Update next's unique to include blocks which | |
| 1201 * were previously shared by only this snapshot | |
| 1202 * and it. Those blocks will be born after the | |
| 1203 * prev snap and before this snap, and will have | |
| 1204 * died after the next snap and before the one | |
| 1205 * after that (ie. be on the snap after next's | |
| 1206 * deadlist). | |
| 1207 * | |
| 1208 * XXX we're doing this long task with the | |
| 1209 * config lock held | |
| 1210 */ | |
| 1211 dsl_dataset_t *ds_after_next; | |
| 1212 | |
| 2199 | 1213 VERIFY(0 == dsl_dataset_open_obj(dp, |
| 789 | 1214 ds_next->ds_phys->ds_next_snap_obj, NULL, |
| 1544 | 1215 DS_MODE_NONE, FTAG, &ds_after_next)); |
| 789 | 1216 itor = 0; |
| 1217 while (bplist_iterate(&ds_after_next->ds_deadlist, | |
| 1218 &itor, &bp) == 0) { | |
| 1219 if (bp.blk_birth > | |
| 1220 ds->ds_phys->ds_prev_snap_txg && | |
| 1221 bp.blk_birth <= | |
| 1222 ds->ds_phys->ds_creation_txg) { | |
| 1223 ds_next->ds_phys->ds_unique_bytes += | |
| 2082 | 1224 bp_get_dasize(dp->dp_spa, &bp); |
| 789 | 1225 } |
| 1226 } | |
| 1227 | |
| 1228 dsl_dataset_close(ds_after_next, DS_MODE_NONE, FTAG); | |
| 1229 ASSERT3P(ds_next->ds_prev, ==, NULL); | |
| 1230 } else { | |
| 1231 /* | |
| 1232 * It would be nice to update the head dataset's | |
| 1233 * unique. To do so we would have to traverse | |
| 1234 * it for blocks born after ds_prev, which is | |
| 1235 * pretty expensive just to maintain something | |
| 1236 * for debugging purposes. | |
| 1237 */ | |
| 1238 ASSERT3P(ds_next->ds_prev, ==, ds); | |
| 1239 dsl_dataset_close(ds_next->ds_prev, DS_MODE_NONE, | |
| 1240 ds_next); | |
| 1241 if (ds_prev) { | |
| 2199 | 1242 VERIFY(0 == dsl_dataset_open_obj(dp, |
| 1544 | 1243 ds->ds_phys->ds_prev_snap_obj, NULL, |
| 1244 DS_MODE_NONE, ds_next, &ds_next->ds_prev)); | |
| 789 | 1245 } else { |
| 1246 ds_next->ds_prev = NULL; | |
| 1247 } | |
| 1248 } | |
| 1249 dsl_dataset_close(ds_next, DS_MODE_NONE, FTAG); | |
| 1250 | |
| 1251 /* | |
| 1252 * NB: unique_bytes is not accurate for head objsets | |
| 1253 * because we don't update it when we delete the most | |
| 1254 * recent snapshot -- see above comment. | |
| 1255 */ | |
| 1256 ASSERT3U(used, ==, ds->ds_phys->ds_unique_bytes); | |
| 1257 } else { | |
| 1258 /* | |
| 1259 * There's no next snapshot, so this is a head dataset. | |
| 1260 * Destroy the deadlist. Unless it's a clone, the | |
| 1261 * deadlist should be empty. (If it's a clone, it's | |
| 1262 * safe to ignore the deadlist contents.) | |
| 1263 */ | |
| 1264 struct killarg ka; | |
| 1265 | |
| 1266 ASSERT(after_branch_point || bplist_empty(&ds->ds_deadlist)); | |
| 1267 bplist_close(&ds->ds_deadlist); | |
| 1268 bplist_destroy(mos, ds->ds_phys->ds_deadlist_obj, tx); | |
| 1269 ds->ds_phys->ds_deadlist_obj = 0; | |
| 1270 | |
| 1271 /* | |
| 1272 * Free everything that we point to (that's born after | |
| 1273 * the previous snapshot, if we are a clone) | |
| 1274 * | |
| 1275 * XXX we're doing this long task with the config lock held | |
| 1276 */ | |
| 1277 ka.usedp = &used; | |
| 1278 ka.compressedp = &compressed; | |
| 1279 ka.uncompressedp = &uncompressed; | |
| 1280 ka.zio = zio; | |
| 1281 ka.tx = tx; | |
| 1282 err = traverse_dsl_dataset(ds, ds->ds_phys->ds_prev_snap_txg, | |
| 1283 ADVANCE_POST, kill_blkptr, &ka); | |
| 1284 ASSERT3U(err, ==, 0); | |
| 1285 } | |
| 1286 | |
| 1287 err = zio_wait(zio); | |
| 1288 ASSERT3U(err, ==, 0); | |
| 1289 | |
| 2199 | 1290 dsl_dir_diduse_space(ds->ds_dir, -used, -compressed, -uncompressed, tx); |
| 789 | 1291 |
| 1292 if (ds->ds_phys->ds_snapnames_zapobj) { | |
| 1293 err = zap_destroy(mos, ds->ds_phys->ds_snapnames_zapobj, tx); | |
| 1294 ASSERT(err == 0); | |
| 1295 } | |
| 1296 | |
| 2199 | 1297 if (ds->ds_dir->dd_phys->dd_head_dataset_obj == ds->ds_object) { |
| 789 | 1298 /* Erase the link in the dataset */ |
| 2199 | 1299 dmu_buf_will_dirty(ds->ds_dir->dd_dbuf, tx); |
| 1300 ds->ds_dir->dd_phys->dd_head_dataset_obj = 0; | |
| 789 | 1301 /* |
| 1302 * dsl_dir_sync_destroy() called us, they'll destroy | |
| 1303 * the dataset. | |
| 1304 */ | |
| 1305 } else { | |
| 1306 /* remove from snapshot namespace */ | |
| 1307 dsl_dataset_t *ds_head; | |
| 2199 | 1308 VERIFY(0 == dsl_dataset_open_obj(dp, |
| 1309 ds->ds_dir->dd_phys->dd_head_dataset_obj, NULL, | |
| 1544 | 1310 DS_MODE_NONE, FTAG, &ds_head)); |
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1311 VERIFY(0 == dsl_dataset_get_snapname(ds)); |
| 789 | 1312 #ifdef ZFS_DEBUG |
| 1313 { | |
| 1314 uint64_t val; | |
| 1315 err = zap_lookup(mos, | |
| 1316 ds_head->ds_phys->ds_snapnames_zapobj, | |
| 2199 | 1317 ds->ds_snapname, 8, 1, &val); |
| 789 | 1318 ASSERT3U(err, ==, 0); |
| 1319 ASSERT3U(val, ==, obj); | |
| 1320 } | |
| 1321 #endif | |
| 1322 err = zap_remove(mos, ds_head->ds_phys->ds_snapnames_zapobj, | |
| 2199 | 1323 ds->ds_snapname, tx); |
| 789 | 1324 ASSERT(err == 0); |
| 1325 dsl_dataset_close(ds_head, DS_MODE_NONE, FTAG); | |
| 1326 } | |
| 1327 | |
| 1328 if (ds_prev && ds->ds_prev != ds_prev) | |
| 1329 dsl_dataset_close(ds_prev, DS_MODE_NONE, FTAG); | |
| 1330 | |
| 3912 | 1331 spa_clear_bootfs(dp->dp_spa, ds->ds_object, tx); |
| 4543 | 1332 spa_history_internal_log(LOG_DS_DESTROY, dp->dp_spa, tx, |
| 1333 cr, "dataset = %llu", ds->ds_object); | |
| 1334 | |
| 2199 | 1335 dsl_dataset_close(ds, DS_MODE_EXCLUSIVE, tag); |
| 1336 VERIFY(0 == dmu_object_free(mos, obj, tx)); | |
| 3912 | 1337 |
| 2199 | 1338 } |
| 1339 | |
| 1340 /* ARGSUSED */ | |
| 1341 int | |
| 1342 dsl_dataset_snapshot_check(void *arg1, void *arg2, dmu_tx_t *tx) | |
| 1343 { | |
| 1344 objset_t *os = arg1; | |
| 1345 dsl_dataset_t *ds = os->os->os_dsl_dataset; | |
| 1346 const char *snapname = arg2; | |
| 1347 objset_t *mos = ds->ds_dir->dd_pool->dp_meta_objset; | |
| 1348 int err; | |
| 1349 uint64_t value; | |
| 789 | 1350 |
| 1351 /* | |
| 2199 | 1352 * We don't allow multiple snapshots of the same txg. If there |
| 1353 * is already one, try again. | |
| 1354 */ | |
| 1355 if (ds->ds_phys->ds_prev_snap_txg >= tx->tx_txg) | |
| 1356 return (EAGAIN); | |
| 1357 | |
| 1358 /* | |
| 1359 * Check for conflicting name snapshot name. | |
| 789 | 1360 */ |
| 2199 | 1361 err = zap_lookup(mos, ds->ds_phys->ds_snapnames_zapobj, |
| 1362 snapname, 8, 1, &value); | |
| 1363 if (err == 0) | |
| 1364 return (EEXIST); | |
| 1365 if (err != ENOENT) | |
| 1366 return (err); | |
| 789 | 1367 |
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1368 /* |
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1369 * Check that the dataset's name is not too long. Name consists |
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1370 * of the dataset's length + 1 for the @-sign + snapshot name's length |
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1371 */ |
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1372 if (dsl_dataset_namelen(ds) + 1 + strlen(snapname) >= MAXNAMELEN) |
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1373 return (ENAMETOOLONG); |
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1374 |
| 2199 | 1375 ds->ds_trysnap_txg = tx->tx_txg; |
| 789 | 1376 return (0); |
| 1377 } | |
| 1378 | |
| 2199 | 1379 void |
| 4543 | 1380 dsl_dataset_snapshot_sync(void *arg1, void *arg2, cred_t *cr, dmu_tx_t *tx) |
| 789 | 1381 { |
| 2199 | 1382 objset_t *os = arg1; |
| 1383 dsl_dataset_t *ds = os->os->os_dsl_dataset; | |
| 1384 const char *snapname = arg2; | |
| 1385 dsl_pool_t *dp = ds->ds_dir->dd_pool; | |
| 789 | 1386 dmu_buf_t *dbuf; |
| 1387 dsl_dataset_phys_t *dsphys; | |
| 2199 | 1388 uint64_t dsobj; |
| 789 | 1389 objset_t *mos = dp->dp_meta_objset; |
| 1390 int err; | |
| 1391 | |
| 1392 spa_scrub_restart(dp->dp_spa, tx->tx_txg); | |
| 2199 | 1393 ASSERT(RW_WRITE_HELD(&dp->dp_config_rwlock)); |
| 789 | 1394 |
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1395 dsobj = dmu_object_alloc(mos, DMU_OT_DSL_DATASET, 0, |
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1396 DMU_OT_DSL_DATASET, sizeof (dsl_dataset_phys_t), tx); |
| 1544 | 1397 VERIFY(0 == dmu_bonus_hold(mos, dsobj, FTAG, &dbuf)); |
| 789 | 1398 dmu_buf_will_dirty(dbuf, tx); |
| 1399 dsphys = dbuf->db_data; | |
| 2199 | 1400 dsphys->ds_dir_obj = ds->ds_dir->dd_object; |
| 789 | 1401 dsphys->ds_fsid_guid = unique_create(); |
| 1402 unique_remove(dsphys->ds_fsid_guid); /* it isn't open yet */ | |
| 1403 (void) random_get_pseudo_bytes((void*)&dsphys->ds_guid, | |
| 1404 sizeof (dsphys->ds_guid)); | |
| 1405 dsphys->ds_prev_snap_obj = ds->ds_phys->ds_prev_snap_obj; | |
| 1406 dsphys->ds_prev_snap_txg = ds->ds_phys->ds_prev_snap_txg; | |
| 1407 dsphys->ds_next_snap_obj = ds->ds_object; | |
| 1408 dsphys->ds_num_children = 1; | |
| 1409 dsphys->ds_creation_time = gethrestime_sec(); | |
| 1410 dsphys->ds_creation_txg = tx->tx_txg; | |
| 1411 dsphys->ds_deadlist_obj = ds->ds_phys->ds_deadlist_obj; | |
| 1412 dsphys->ds_used_bytes = ds->ds_phys->ds_used_bytes; | |
| 1413 dsphys->ds_compressed_bytes = ds->ds_phys->ds_compressed_bytes; | |
| 1414 dsphys->ds_uncompressed_bytes = ds->ds_phys->ds_uncompressed_bytes; | |
| 2082 | 1415 dsphys->ds_flags = ds->ds_phys->ds_flags; |
| 789 | 1416 dsphys->ds_bp = ds->ds_phys->ds_bp; |
| 1544 | 1417 dmu_buf_rele(dbuf, FTAG); |
| 789 | 1418 |
| 2199 | 1419 ASSERT3U(ds->ds_prev != 0, ==, ds->ds_phys->ds_prev_snap_obj != 0); |
| 1420 if (ds->ds_prev) { | |
| 1421 ASSERT(ds->ds_prev->ds_phys->ds_next_snap_obj == | |
| 789 | 1422 ds->ds_object || |
| 2199 | 1423 ds->ds_prev->ds_phys->ds_num_children > 1); |
| 1424 if (ds->ds_prev->ds_phys->ds_next_snap_obj == ds->ds_object) { | |
| 1425 dmu_buf_will_dirty(ds->ds_prev->ds_dbuf, tx); | |
| 789 | 1426 ASSERT3U(ds->ds_phys->ds_prev_snap_txg, ==, |
| 2199 | 1427 ds->ds_prev->ds_phys->ds_creation_txg); |
| 1428 ds->ds_prev->ds_phys->ds_next_snap_obj = dsobj; | |
| 789 | 1429 } |
| 1430 } | |
| 1431 | |
| 1432 bplist_close(&ds->ds_deadlist); | |
| 1433 dmu_buf_will_dirty(ds->ds_dbuf, tx); | |
| 1434 ASSERT3U(ds->ds_phys->ds_prev_snap_txg, <, dsphys->ds_creation_txg); | |
| 1435 ds->ds_phys->ds_prev_snap_obj = dsobj; | |
| 1436 ds->ds_phys->ds_prev_snap_txg = dsphys->ds_creation_txg; | |
| 1437 ds->ds_phys->ds_unique_bytes = 0; | |
| 1438 ds->ds_phys->ds_deadlist_obj = | |
| 1439 bplist_create(mos, DSL_DEADLIST_BLOCKSIZE, tx); | |
| 1544 | 1440 VERIFY(0 == bplist_open(&ds->ds_deadlist, mos, |
| 1441 ds->ds_phys->ds_deadlist_obj)); | |
| 789 | 1442 |
| 1443 dprintf("snap '%s' -> obj %llu\n", snapname, dsobj); | |
| 1444 err = zap_add(mos, ds->ds_phys->ds_snapnames_zapobj, | |
| 1445 snapname, 8, 1, &dsobj, tx); | |
| 1446 ASSERT(err == 0); | |
| 1447 | |
| 1448 if (ds->ds_prev) | |
| 1449 dsl_dataset_close(ds->ds_prev, DS_MODE_NONE, ds); | |
| 1544 | 1450 VERIFY(0 == dsl_dataset_open_obj(dp, |
| 1451 ds->ds_phys->ds_prev_snap_obj, snapname, | |
| 1452 DS_MODE_NONE, ds, &ds->ds_prev)); | |
| 4543 | 1453 |
| 1454 spa_history_internal_log(LOG_DS_SNAPSHOT, dp->dp_spa, tx, cr, | |
| 1455 "dataset = %llu", ds->ds_object); | |
| 789 | 1456 } |
| 1457 | |
| 1458 void | |
|
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1459 dsl_dataset_sync(dsl_dataset_t *ds, zio_t *zio, dmu_tx_t *tx) |
| 789 | 1460 { |
| 1461 ASSERT(dmu_tx_is_syncing(tx)); | |
| 1462 ASSERT(ds->ds_user_ptr != NULL); | |
| 1463 ASSERT(ds->ds_phys->ds_next_snap_obj == 0); | |
| 1464 | |
| 1465 dsl_dir_dirty(ds->ds_dir, tx); | |
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1466 dmu_objset_sync(ds->ds_user_ptr, zio, tx); |
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1467 /* Unneeded? bplist_close(&ds->ds_deadlist); */ |
| 789 | 1468 } |
| 1469 | |
| 1470 void | |
| 2885 | 1471 dsl_dataset_stats(dsl_dataset_t *ds, nvlist_t *nv) |
| 789 | 1472 { |
| 2885 | 1473 dsl_dir_stats(ds->ds_dir, nv); |
| 789 | 1474 |
| 2885 | 1475 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_CREATION, |
| 1476 ds->ds_phys->ds_creation_time); | |
| 1477 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_CREATETXG, | |
| 1478 ds->ds_phys->ds_creation_txg); | |
| 1479 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_REFERENCED, | |
| 1480 ds->ds_phys->ds_used_bytes); | |
| 789 | 1481 |
| 1482 if (ds->ds_phys->ds_next_snap_obj) { | |
| 1483 /* | |
| 1484 * This is a snapshot; override the dd's space used with | |
| 2885 | 1485 * our unique space and compression ratio. |
| 789 | 1486 */ |
| 2885 | 1487 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_USED, |
| 1488 ds->ds_phys->ds_unique_bytes); | |
| 1489 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_COMPRESSRATIO, | |
| 1490 ds->ds_phys->ds_compressed_bytes == 0 ? 100 : | |
| 1491 (ds->ds_phys->ds_uncompressed_bytes * 100 / | |
| 1492 ds->ds_phys->ds_compressed_bytes)); | |
| 789 | 1493 } |
| 1494 } | |
| 1495 | |
| 2885 | 1496 void |
| 1497 dsl_dataset_fast_stat(dsl_dataset_t *ds, dmu_objset_stats_t *stat) | |
| 789 | 1498 { |
| 2885 | 1499 stat->dds_creation_txg = ds->ds_phys->ds_creation_txg; |
| 1500 stat->dds_inconsistent = ds->ds_phys->ds_flags & DS_FLAG_INCONSISTENT; | |
| 1501 if (ds->ds_phys->ds_next_snap_obj) { | |
| 1502 stat->dds_is_snapshot = B_TRUE; | |
| 1503 stat->dds_num_clones = ds->ds_phys->ds_num_children - 1; | |
| 1504 } | |
| 1505 | |
| 1506 /* clone origin is really a dsl_dir thing... */ | |
| 1507 if (ds->ds_dir->dd_phys->dd_clone_parent_obj) { | |
| 1508 dsl_dataset_t *ods; | |
| 1509 | |
| 1510 rw_enter(&ds->ds_dir->dd_pool->dp_config_rwlock, RW_READER); | |
| 1511 VERIFY(0 == dsl_dataset_open_obj(ds->ds_dir->dd_pool, | |
| 1512 ds->ds_dir->dd_phys->dd_clone_parent_obj, | |
| 1513 NULL, DS_MODE_NONE, FTAG, &ods)); | |
| 1514 dsl_dataset_name(ods, stat->dds_clone_of); | |
| 1515 dsl_dataset_close(ods, DS_MODE_NONE, FTAG); | |
| 1516 rw_exit(&ds->ds_dir->dd_pool->dp_config_rwlock); | |
| 1517 } | |
| 1518 } | |
| 1519 | |
| 1520 uint64_t | |
| 1521 dsl_dataset_fsid_guid(dsl_dataset_t *ds) | |
| 1522 { | |
| 1523 return (ds->ds_phys->ds_fsid_guid); | |
| 1524 } | |
| 1525 | |
| 1526 void | |
| 1527 dsl_dataset_space(dsl_dataset_t *ds, | |
| 1528 uint64_t *refdbytesp, uint64_t *availbytesp, | |
| 1529 uint64_t *usedobjsp, uint64_t *availobjsp) | |
| 1530 { | |
| 1531 *refdbytesp = ds->ds_phys->ds_used_bytes; | |
| 1532 *availbytesp = dsl_dir_space_available(ds->ds_dir, NULL, 0, TRUE); | |
| 1533 *usedobjsp = ds->ds_phys->ds_bp.blk_fill; | |
| 1534 *availobjsp = DN_MAX_OBJECT - *usedobjsp; | |
| 789 | 1535 } |
| 1536 | |
| 2199 | 1537 /* ARGSUSED */ |
| 789 | 1538 static int |
| 2199 | 1539 dsl_dataset_snapshot_rename_check(void *arg1, void *arg2, dmu_tx_t *tx) |
| 789 | 1540 { |
| 2199 | 1541 dsl_dataset_t *ds = arg1; |
| 1542 char *newsnapname = arg2; | |
| 1543 dsl_dir_t *dd = ds->ds_dir; | |
| 789 | 1544 objset_t *mos = dd->dd_pool->dp_meta_objset; |
| 2199 | 1545 dsl_dataset_t *hds; |
| 1546 uint64_t val; | |
| 789 | 1547 int err; |
| 1548 | |
| 2199 | 1549 err = dsl_dataset_open_obj(dd->dd_pool, |
| 1550 dd->dd_phys->dd_head_dataset_obj, NULL, DS_MODE_NONE, FTAG, &hds); | |
| 789 | 1551 if (err) |
| 1552 return (err); | |
| 1553 | |
| 2199 | 1554 /* new name better not be in use */ |
| 1555 err = zap_lookup(mos, hds->ds_phys->ds_snapnames_zapobj, | |
| 1556 newsnapname, 8, 1, &val); | |
| 1557 dsl_dataset_close(hds, DS_MODE_NONE, FTAG); | |
| 789 | 1558 |
| 2199 | 1559 if (err == 0) |
| 1560 err = EEXIST; | |
| 1561 else if (err == ENOENT) | |
| 1562 err = 0; | |
| 4007 | 1563 |
| 1564 /* dataset name + 1 for the "@" + the new snapshot name must fit */ | |
| 1565 if (dsl_dir_namelen(ds->ds_dir) + 1 + strlen(newsnapname) >= MAXNAMELEN) | |
| 1566 err = ENAMETOOLONG; | |
| 1567 | |
| 2199 | 1568 return (err); |
| 1569 } | |
| 789 | 1570 |
| 2199 | 1571 static void |
| 4543 | 1572 dsl_dataset_snapshot_rename_sync(void *arg1, void *arg2, |
| 1573 cred_t *cr, dmu_tx_t *tx) | |
| 2199 | 1574 { |
| 1575 dsl_dataset_t *ds = arg1; | |
| 4543 | 1576 const char *newsnapname = arg2; |
| 2199 | 1577 dsl_dir_t *dd = ds->ds_dir; |
| 1578 objset_t *mos = dd->dd_pool->dp_meta_objset; | |
| 1579 dsl_dataset_t *hds; | |
| 1580 int err; | |
| 789 | 1581 |
| 2199 | 1582 ASSERT(ds->ds_phys->ds_next_snap_obj != 0); |
| 789 | 1583 |
| 2199 | 1584 VERIFY(0 == dsl_dataset_open_obj(dd->dd_pool, |
| 1585 dd->dd_phys->dd_head_dataset_obj, NULL, DS_MODE_NONE, FTAG, &hds)); | |
| 789 | 1586 |
| 2199 | 1587 VERIFY(0 == dsl_dataset_get_snapname(ds)); |
| 1588 err = zap_remove(mos, hds->ds_phys->ds_snapnames_zapobj, | |
| 1589 ds->ds_snapname, tx); | |
| 789 | 1590 ASSERT3U(err, ==, 0); |
| 2199 | 1591 mutex_enter(&ds->ds_lock); |
| 1592 (void) strcpy(ds->ds_snapname, newsnapname); | |
| 1593 mutex_exit(&ds->ds_lock); | |
| 1594 err = zap_add(mos, hds->ds_phys->ds_snapnames_zapobj, | |
| 1595 ds->ds_snapname, 8, 1, &ds->ds_object, tx); | |
| 789 | 1596 ASSERT3U(err, ==, 0); |
| 1597 | |
| 4543 | 1598 spa_history_internal_log(LOG_DS_RENAME, dd->dd_pool->dp_spa, tx, |
| 1599 cr, "dataset = %llu", ds->ds_object); | |
| 2199 | 1600 dsl_dataset_close(hds, DS_MODE_NONE, FTAG); |
| 789 | 1601 } |
| 1602 | |
| 4007 | 1603 struct renamearg { |
| 1604 dsl_sync_task_group_t *dstg; | |
| 1605 char failed[MAXPATHLEN]; | |
| 1606 char *oldsnap; | |
| 1607 char *newsnap; | |
| 1608 }; | |
| 1609 | |
| 1610 static int | |
| 1611 dsl_snapshot_rename_one(char *name, void *arg) | |
| 1612 { | |
| 1613 struct renamearg *ra = arg; | |
| 1614 dsl_dataset_t *ds = NULL; | |
| 1615 char *cp; | |
| 1616 int err; | |
| 1617 | |
| 1618 cp = name + strlen(name); | |
| 1619 *cp = '@'; | |
| 1620 (void) strcpy(cp + 1, ra->oldsnap); | |
| 4543 | 1621 |
| 1622 /* | |
| 1623 * For recursive snapshot renames the parent won't be changing | |
| 1624 * so we just pass name for both the to/from argument. | |
| 1625 */ | |
| 1626 if (err = zfs_secpolicy_rename_perms(name, name, CRED())) { | |
| 1627 (void) strcpy(ra->failed, name); | |
| 1628 return (err); | |
| 1629 } | |
| 1630 | |
| 4007 | 1631 err = dsl_dataset_open(name, DS_MODE_READONLY | DS_MODE_STANDARD, |
| 1632 ra->dstg, &ds); | |
| 1633 if (err == ENOENT) { | |
| 1634 *cp = '\0'; | |
| 1635 return (0); | |
| 1636 } | |
| 1637 if (err) { | |
| 1638 (void) strcpy(ra->failed, name); | |
| 1639 *cp = '\0'; | |
| 1640 dsl_dataset_close(ds, DS_MODE_STANDARD, ra->dstg); | |
| 1641 return (err); | |
| 1642 } | |
| 1643 | |
| 1644 #ifdef _KERNEL | |
| 1645 /* for all filesystems undergoing rename, we'll need to unmount it */ | |
| 1646 (void) zfs_unmount_snap(name, NULL); | |
| 1647 #endif | |
| 1648 | |
| 1649 *cp = '\0'; | |
| 1650 | |
| 1651 dsl_sync_task_create(ra->dstg, dsl_dataset_snapshot_rename_check, | |
| 1652 dsl_dataset_snapshot_rename_sync, ds, ra->newsnap, 0); | |
| 1653 | |
| 1654 return (0); | |
| 1655 } | |
| 1656 | |
| 1657 static int | |
| 1658 dsl_recursive_rename(char *oldname, const char *newname) | |
| 1659 { | |
| 1660 int err; | |
| 1661 struct renamearg *ra; | |
| 1662 dsl_sync_task_t *dst; | |
| 1663 spa_t *spa; | |
| 1664 char *cp, *fsname = spa_strdup(oldname); | |
| 1665 int len = strlen(oldname); | |
| 1666 | |
| 1667 /* truncate the snapshot name to get the fsname */ | |
| 1668 cp = strchr(fsname, '@'); | |
| 1669 *cp = '\0'; | |
| 1670 | |
| 1671 cp = strchr(fsname, '/'); | |
| 1672 if (cp) { | |
| 1673 *cp = '\0'; | |
| 1674 err = spa_open(fsname, &spa, FTAG); | |
| 1675 *cp = '/'; | |
| 1676 } else { | |
| 1677 err = spa_open(fsname, &spa, FTAG); | |
| 1678 } | |
| 1679 if (err) { | |
| 1680 kmem_free(fsname, len + 1); | |
| 1681 return (err); | |
| 1682 } | |
| 1683 ra = kmem_alloc(sizeof (struct renamearg), KM_SLEEP); | |
| 1684 ra->dstg = dsl_sync_task_group_create(spa_get_dsl(spa)); | |
| 1685 | |
| 1686 ra->oldsnap = strchr(oldname, '@') + 1; | |
| 1687 ra->newsnap = strchr(newname, '@') + 1; | |
| 1688 *ra->failed = '\0'; | |
| 1689 | |
| 1690 err = dmu_objset_find(fsname, dsl_snapshot_rename_one, ra, | |
| 1691 DS_FIND_CHILDREN); | |
| 1692 kmem_free(fsname, len + 1); | |
| 1693 | |
| 1694 if (err == 0) { | |
| 1695 err = dsl_sync_task_group_wait(ra->dstg); | |
| 1696 } | |
| 1697 | |
| 1698 for (dst = list_head(&ra->dstg->dstg_tasks); dst; | |
| 1699 dst = list_next(&ra->dstg->dstg_tasks, dst)) { | |
| 1700 dsl_dataset_t *ds = dst->dst_arg1; | |
| 1701 if (dst->dst_err) { | |
| 1702 dsl_dir_name(ds->ds_dir, ra->failed); | |
|
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1703 (void) strcat(ra->failed, "@"); |
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1704 (void) strcat(ra->failed, ra->newsnap); |
| 4007 | 1705 } |
| 1706 dsl_dataset_close(ds, DS_MODE_STANDARD, ra->dstg); | |
| 1707 } | |
| 1708 | |
| 4543 | 1709 if (err) |
| 1710 (void) strcpy(oldname, ra->failed); | |
| 4007 | 1711 |
| 1712 dsl_sync_task_group_destroy(ra->dstg); | |
| 1713 kmem_free(ra, sizeof (struct renamearg)); | |
| 1714 spa_close(spa, FTAG); | |
| 1715 return (err); | |
| 1716 } | |
| 1717 | |
|
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1718 static int |
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1719 dsl_valid_rename(char *oldname, void *arg) |
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1720 { |
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1721 int delta = *(int *)arg; |
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1722 |
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1723 if (strlen(oldname) + delta >= MAXNAMELEN) |
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1724 return (ENAMETOOLONG); |
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1725 |
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1726 return (0); |
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1727 } |
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1728 |
| 789 | 1729 #pragma weak dmu_objset_rename = dsl_dataset_rename |
| 1730 int | |
| 4007 | 1731 dsl_dataset_rename(char *oldname, const char *newname, |
| 1732 boolean_t recursive) | |
| 789 | 1733 { |
| 1734 dsl_dir_t *dd; | |
| 2199 | 1735 dsl_dataset_t *ds; |
| 789 | 1736 const char *tail; |
| 1737 int err; | |
| 1738 | |
| 2199 | 1739 err = dsl_dir_open(oldname, FTAG, &dd, &tail); |
| 1544 | 1740 if (err) |
| 1741 return (err); | |
| 789 | 1742 if (tail == NULL) { |
|
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1743 int delta = strlen(newname) - strlen(oldname); |
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1744 |
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1745 /* if we're growing, validate child size lengths */ |
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1746 if (delta > 0) |
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1747 err = dmu_objset_find(oldname, dsl_valid_rename, |
|
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1748 &delta, DS_FIND_CHILDREN | DS_FIND_SNAPSHOTS); |
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1749 |
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1750 if (!err) |
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1751 err = dsl_dir_rename(dd, newname); |
| 789 | 1752 dsl_dir_close(dd, FTAG); |
| 1753 return (err); | |
| 1754 } | |
| 1755 if (tail[0] != '@') { | |
| 1756 /* the name ended in a nonexistant component */ | |
| 1757 dsl_dir_close(dd, FTAG); | |
| 1758 return (ENOENT); | |
| 1759 } | |
| 1760 | |
| 2199 | 1761 dsl_dir_close(dd, FTAG); |
| 1762 | |
| 1763 /* new name must be snapshot in same filesystem */ | |
| 1764 tail = strchr(newname, '@'); | |
| 1765 if (tail == NULL) | |
| 1766 return (EINVAL); | |
| 1767 tail++; | |
| 1768 if (strncmp(oldname, newname, tail - newname) != 0) | |
| 1769 return (EXDEV); | |
| 789 | 1770 |
| 4007 | 1771 if (recursive) { |
| 1772 err = dsl_recursive_rename(oldname, newname); | |
| 1773 } else { | |
| 1774 err = dsl_dataset_open(oldname, | |
| 1775 DS_MODE_READONLY | DS_MODE_STANDARD, FTAG, &ds); | |
| 1776 if (err) | |
| 1777 return (err); | |
| 2199 | 1778 |
| 4007 | 1779 err = dsl_sync_task_do(ds->ds_dir->dd_pool, |
| 1780 dsl_dataset_snapshot_rename_check, | |
| 1781 dsl_dataset_snapshot_rename_sync, ds, (char *)tail, 1); | |
| 2199 | 1782 |
| 4007 | 1783 dsl_dataset_close(ds, DS_MODE_STANDARD, FTAG); |
| 1784 } | |
| 2199 | 1785 |
| 789 | 1786 return (err); |
| 1787 } | |
| 2082 | 1788 |
| 2199 | 1789 struct promotearg { |
| 1790 uint64_t used, comp, uncomp, unique; | |
| 1791 uint64_t newnext_obj, snapnames_obj; | |
| 1792 }; | |
| 1793 | |
| 4543 | 1794 /* ARGSUSED */ |
| 2082 | 1795 static int |
| 2199 | 1796 dsl_dataset_promote_check(void *arg1, void *arg2, dmu_tx_t *tx) |
| 2082 | 1797 { |
| 2199 | 1798 dsl_dataset_t *hds = arg1; |
| 1799 struct promotearg *pa = arg2; | |
| 1800 dsl_dir_t *dd = hds->ds_dir; | |
| 1801 dsl_pool_t *dp = hds->ds_dir->dd_pool; | |
| 2082 | 1802 dsl_dir_t *pdd = NULL; |
| 1803 dsl_dataset_t *ds = NULL; | |
| 1804 dsl_dataset_t *pivot_ds = NULL; | |
| 1805 dsl_dataset_t *newnext_ds = NULL; | |
| 1806 int err; | |
| 1807 char *name = NULL; | |
| 2199 | 1808 uint64_t itor = 0; |
| 2082 | 1809 blkptr_t bp; |
| 1810 | |
| 2199 | 1811 bzero(pa, sizeof (*pa)); |
| 1812 | |
| 2082 | 1813 /* Check that it is a clone */ |
| 1814 if (dd->dd_phys->dd_clone_parent_obj == 0) | |
| 1815 return (EINVAL); | |
| 1816 | |
| 2199 | 1817 /* Since this is so expensive, don't do the preliminary check */ |
| 1818 if (!dmu_tx_is_syncing(tx)) | |
| 1819 return (0); | |
| 1820 | |
| 1821 if (err = dsl_dataset_open_obj(dp, | |
| 2082 | 1822 dd->dd_phys->dd_clone_parent_obj, |
| 1823 NULL, DS_MODE_EXCLUSIVE, FTAG, &pivot_ds)) | |
| 1824 goto out; | |
| 1825 pdd = pivot_ds->ds_dir; | |
| 2199 | 1826 |
| 1827 { | |
| 1828 dsl_dataset_t *phds; | |
| 1829 if (err = dsl_dataset_open_obj(dd->dd_pool, | |
| 1830 pdd->dd_phys->dd_head_dataset_obj, | |
| 1831 NULL, DS_MODE_NONE, FTAG, &phds)) | |
| 1832 goto out; | |
| 1833 pa->snapnames_obj = phds->ds_phys->ds_snapnames_zapobj; | |
| 1834 dsl_dataset_close(phds, DS_MODE_NONE, FTAG); | |
| 1835 } | |
| 2082 | 1836 |
| 1837 if (hds->ds_phys->ds_flags & DS_FLAG_NOPROMOTE) { | |
| 1838 err = EXDEV; | |
| 1839 goto out; | |
| 1840 } | |
| 1841 | |
| 1842 /* find pivot point's new next ds */ | |
| 1843 VERIFY(0 == dsl_dataset_open_obj(dd->dd_pool, hds->ds_object, | |
| 1844 NULL, DS_MODE_NONE, FTAG, &newnext_ds)); | |
| 1845 while (newnext_ds->ds_phys->ds_prev_snap_obj != pivot_ds->ds_object) { | |
| 1846 dsl_dataset_t *prev; | |
| 1847 | |
| 1848 if (err = dsl_dataset_open_obj(dd->dd_pool, | |
| 2199 | 1849 newnext_ds->ds_phys->ds_prev_snap_obj, |
| 1850 NULL, DS_MODE_NONE, FTAG, &prev)) | |
| 2082 | 1851 goto out; |
| 1852 dsl_dataset_close(newnext_ds, DS_MODE_NONE, FTAG); | |
| 1853 newnext_ds = prev; | |
| 1854 } | |
| 2199 | 1855 pa->newnext_obj = newnext_ds->ds_object; |
| 2082 | 1856 |
| 1857 /* compute pivot point's new unique space */ | |
| 1858 while ((err = bplist_iterate(&newnext_ds->ds_deadlist, | |
| 1859 &itor, &bp)) == 0) { | |
| 1860 if (bp.blk_birth > pivot_ds->ds_phys->ds_prev_snap_txg) | |
| 2199 | 1861 pa->unique += bp_get_dasize(dd->dd_pool->dp_spa, &bp); |
| 2082 | 1862 } |
| 1863 if (err != ENOENT) | |
| 1864 goto out; | |
| 1865 | |
| 1866 /* Walk the snapshots that we are moving */ | |
| 1867 name = kmem_alloc(MAXPATHLEN, KM_SLEEP); | |
| 1868 ds = pivot_ds; | |
| 1869 /* CONSTCOND */ | |
| 1870 while (TRUE) { | |
| 1871 uint64_t val, dlused, dlcomp, dluncomp; | |
| 1872 dsl_dataset_t *prev; | |
| 1873 | |
| 1874 /* Check that the snapshot name does not conflict */ | |
| 1875 dsl_dataset_name(ds, name); | |
| 1876 err = zap_lookup(dd->dd_pool->dp_meta_objset, | |
| 1877 hds->ds_phys->ds_snapnames_zapobj, ds->ds_snapname, | |
| 1878 8, 1, &val); | |
| 1879 if (err != ENOENT) { | |
| 1880 if (err == 0) | |
| 1881 err = EEXIST; | |
| 1882 goto out; | |
| 1883 } | |
| 1884 | |
| 1885 /* | |
| 1886 * compute space to transfer. Each snapshot gave birth to: | |
| 1887 * (my used) - (prev's used) + (deadlist's used) | |
| 1888 */ | |
| 2199 | 1889 pa->used += ds->ds_phys->ds_used_bytes; |
| 1890 pa->comp += ds->ds_phys->ds_compressed_bytes; | |
| 1891 pa->uncomp += ds->ds_phys->ds_uncompressed_bytes; | |
| 2082 | 1892 |
| 1893 /* If we reach the first snapshot, we're done. */ | |
| 1894 if (ds->ds_phys->ds_prev_snap_obj == 0) | |
| 1895 break; | |
| 1896 | |
| 1897 if (err = bplist_space(&ds->ds_deadlist, | |
| 1898 &dlused, &dlcomp, &dluncomp)) | |
| 1899 goto out; | |
| 1900 if (err = dsl_dataset_open_obj(dd->dd_pool, | |
| 1901 ds->ds_phys->ds_prev_snap_obj, NULL, DS_MODE_EXCLUSIVE, | |
| 1902 FTAG, &prev)) | |
| 1903 goto out; | |
| 2199 | 1904 pa->used += dlused - prev->ds_phys->ds_used_bytes; |
| 1905 pa->comp += dlcomp - prev->ds_phys->ds_compressed_bytes; | |
| 1906 pa->uncomp += dluncomp - prev->ds_phys->ds_uncompressed_bytes; | |
| 2082 | 1907 |
| 1908 /* | |
| 1909 * We could be a clone of a clone. If we reach our | |
| 1910 * parent's branch point, we're done. | |
| 1911 */ | |
| 1912 if (prev->ds_phys->ds_next_snap_obj != ds->ds_object) { | |
| 1913 dsl_dataset_close(prev, DS_MODE_EXCLUSIVE, FTAG); | |
| 1914 break; | |
| 1915 } | |
| 1916 if (ds != pivot_ds) | |
| 1917 dsl_dataset_close(ds, DS_MODE_EXCLUSIVE, FTAG); | |
| 1918 ds = prev; | |
| 1919 } | |
| 1920 | |
| 1921 /* Check that there is enough space here */ | |
| 2199 | 1922 err = dsl_dir_transfer_possible(pdd, dd, pa->used); |
| 1923 | |
| 1924 out: | |
| 1925 if (ds && ds != pivot_ds) | |
| 1926 dsl_dataset_close(ds, DS_MODE_EXCLUSIVE, FTAG); | |
| 1927 if (pivot_ds) | |
| 1928 dsl_dataset_close(pivot_ds, DS_MODE_EXCLUSIVE, FTAG); | |
| 1929 if (newnext_ds) | |
| 1930 dsl_dataset_close(newnext_ds, DS_MODE_NONE, FTAG); | |
| 1931 if (name) | |
| 1932 kmem_free(name, MAXPATHLEN); | |
| 1933 return (err); | |
| 1934 } | |
| 2082 | 1935 |
| 2199 | 1936 static void |
| 4543 | 1937 dsl_dataset_promote_sync(void *arg1, void *arg2, cred_t *cr, dmu_tx_t *tx) |
| 2199 | 1938 { |
| 1939 dsl_dataset_t *hds = arg1; | |
| 1940 struct promotearg *pa = arg2; | |
| 1941 dsl_dir_t *dd = hds->ds_dir; | |
| 1942 dsl_pool_t *dp = hds->ds_dir->dd_pool; | |
| 1943 dsl_dir_t *pdd = NULL; | |
| 1944 dsl_dataset_t *ds, *pivot_ds; | |
| 1945 char *name; | |
| 1946 | |
| 1947 ASSERT(dd->dd_phys->dd_clone_parent_obj != 0); | |
| 1948 ASSERT(0 == (hds->ds_phys->ds_flags & DS_FLAG_NOPROMOTE)); | |
| 1949 | |
| 1950 VERIFY(0 == dsl_dataset_open_obj(dp, | |
| 1951 dd->dd_phys->dd_clone_parent_obj, | |
| 1952 NULL, DS_MODE_EXCLUSIVE, FTAG, &pivot_ds)); | |
| 2417 | 1953 /* |
| 1954 * We need to explicitly open pdd, since pivot_ds's pdd will be | |
| 1955 * changing. | |
| 1956 */ | |
| 1957 VERIFY(0 == dsl_dir_open_obj(dp, pivot_ds->ds_dir->dd_object, | |
| 1958 NULL, FTAG, &pdd)); | |
| 2082 | 1959 |
| 1960 /* move snapshots to this dir */ | |
| 2199 | 1961 name = kmem_alloc(MAXPATHLEN, KM_SLEEP); |
| 2082 | 1962 ds = pivot_ds; |
| 1963 /* CONSTCOND */ | |
| 1964 while (TRUE) { | |
| 1965 dsl_dataset_t *prev; | |
| 1966 | |
| 1967 /* move snap name entry */ | |
| 1968 dsl_dataset_name(ds, name); | |
| 2199 | 1969 VERIFY(0 == zap_remove(dp->dp_meta_objset, |
| 1970 pa->snapnames_obj, ds->ds_snapname, tx)); | |
| 1971 VERIFY(0 == zap_add(dp->dp_meta_objset, | |
| 2082 | 1972 hds->ds_phys->ds_snapnames_zapobj, ds->ds_snapname, |
| 1973 8, 1, &ds->ds_object, tx)); | |
| 1974 | |
| 1975 /* change containing dsl_dir */ | |
| 1976 dmu_buf_will_dirty(ds->ds_dbuf, tx); | |
| 1977 ASSERT3U(ds->ds_phys->ds_dir_obj, ==, pdd->dd_object); | |
| 1978 ds->ds_phys->ds_dir_obj = dd->dd_object; | |
| 1979 ASSERT3P(ds->ds_dir, ==, pdd); | |
| 1980 dsl_dir_close(ds->ds_dir, ds); | |
| 2199 | 1981 VERIFY(0 == dsl_dir_open_obj(dp, dd->dd_object, |
| 2082 | 1982 NULL, ds, &ds->ds_dir)); |
| 1983 | |
| 1984 ASSERT3U(dsl_prop_numcb(ds), ==, 0); | |
| 1985 | |
| 1986 if (ds->ds_phys->ds_prev_snap_obj == 0) | |
| 1987 break; | |
| 1988 | |
| 2199 | 1989 VERIFY(0 == dsl_dataset_open_obj(dp, |
| 2082 | 1990 ds->ds_phys->ds_prev_snap_obj, NULL, DS_MODE_EXCLUSIVE, |
| 1991 FTAG, &prev)); | |
| 1992 | |
| 1993 if (prev->ds_phys->ds_next_snap_obj != ds->ds_object) { | |
| 1994 dsl_dataset_close(prev, DS_MODE_EXCLUSIVE, FTAG); | |
| 1995 break; | |
| 1996 } | |
| 1997 if (ds != pivot_ds) | |
| 1998 dsl_dataset_close(ds, DS_MODE_EXCLUSIVE, FTAG); | |
| 1999 ds = prev; | |
| 2000 } | |
| 2199 | 2001 if (ds != pivot_ds) |
| 2002 dsl_dataset_close(ds, DS_MODE_EXCLUSIVE, FTAG); | |
| 2082 | 2003 |
| 2004 /* change pivot point's next snap */ | |
| 2005 dmu_buf_will_dirty(pivot_ds->ds_dbuf, tx); | |
| 2199 | 2006 pivot_ds->ds_phys->ds_next_snap_obj = pa->newnext_obj; |
| 2082 | 2007 |
| 2008 /* change clone_parent-age */ | |
| 2009 dmu_buf_will_dirty(dd->dd_dbuf, tx); | |
| 2010 ASSERT3U(dd->dd_phys->dd_clone_parent_obj, ==, pivot_ds->ds_object); | |
| 2011 dd->dd_phys->dd_clone_parent_obj = pdd->dd_phys->dd_clone_parent_obj; | |
| 2012 dmu_buf_will_dirty(pdd->dd_dbuf, tx); | |
| 2013 pdd->dd_phys->dd_clone_parent_obj = pivot_ds->ds_object; | |
| 2014 | |
| 2015 /* change space accounting */ | |
| 2199 | 2016 dsl_dir_diduse_space(pdd, -pa->used, -pa->comp, -pa->uncomp, tx); |
| 2017 dsl_dir_diduse_space(dd, pa->used, pa->comp, pa->uncomp, tx); | |
| 2018 pivot_ds->ds_phys->ds_unique_bytes = pa->unique; | |
| 2082 | 2019 |
| 4543 | 2020 /* log history record */ |
| 2021 spa_history_internal_log(LOG_DS_PROMOTE, dd->dd_pool->dp_spa, tx, | |
| 2022 cr, "dataset = %llu", ds->ds_object); | |
| 2023 | |
| 2417 | 2024 dsl_dir_close(pdd, FTAG); |
| 2199 | 2025 dsl_dataset_close(pivot_ds, DS_MODE_EXCLUSIVE, FTAG); |
| 2026 kmem_free(name, MAXPATHLEN); | |
| 2082 | 2027 } |
| 2028 | |
| 2029 int | |
| 2030 dsl_dataset_promote(const char *name) | |
| 2031 { | |
| 2032 dsl_dataset_t *ds; | |
| 2033 int err; | |
| 2034 dmu_object_info_t doi; | |
| 2199 | 2035 struct promotearg pa; |
| 2082 | 2036 |
| 2037 err = dsl_dataset_open(name, DS_MODE_NONE, FTAG, &ds); | |
| 2038 if (err) | |
| 2039 return (err); | |
| 2040 | |
| 2041 err = dmu_object_info(ds->ds_dir->dd_pool->dp_meta_objset, | |
| 2042 ds->ds_phys->ds_snapnames_zapobj, &doi); | |
| 2043 if (err) { | |
| 2044 dsl_dataset_close(ds, DS_MODE_NONE, FTAG); | |
| 2045 return (err); | |
| 2046 } | |
| 2047 | |
| 2048 /* | |
| 2049 * Add in 128x the snapnames zapobj size, since we will be moving | |
| 2050 * a bunch of snapnames to the promoted ds, and dirtying their | |
| 2051 * bonus buffers. | |
| 2052 */ | |
| 2199 | 2053 err = dsl_sync_task_do(ds->ds_dir->dd_pool, |
| 2054 dsl_dataset_promote_check, | |
| 2055 dsl_dataset_promote_sync, ds, &pa, 2 + 2 * doi.doi_physical_blks); | |
| 2082 | 2056 dsl_dataset_close(ds, DS_MODE_NONE, FTAG); |
| 2057 return (err); | |
| 2058 } | |
| 3912 | 2059 |
| 2060 /* | |
| 2061 * Given a pool name and a dataset object number in that pool, | |
| 2062 * return the name of that dataset. | |
| 2063 */ | |
| 2064 int | |
| 2065 dsl_dsobj_to_dsname(char *pname, uint64_t obj, char *buf) | |
| 2066 { | |
| 2067 spa_t *spa; | |
| 2068 dsl_pool_t *dp; | |
| 2069 dsl_dataset_t *ds = NULL; | |
| 2070 int error; | |
| 2071 | |
| 2072 if ((error = spa_open(pname, &spa, FTAG)) != 0) | |
| 2073 return (error); | |
| 2074 dp = spa_get_dsl(spa); | |
| 2075 rw_enter(&dp->dp_config_rwlock, RW_READER); | |
| 2076 if ((error = dsl_dataset_open_obj(dp, obj, | |
| 2077 NULL, DS_MODE_NONE, FTAG, &ds)) != 0) { | |
| 2078 rw_exit(&dp->dp_config_rwlock); | |
| 2079 spa_close(spa, FTAG); | |
| 2080 return (error); | |
| 2081 } | |
| 2082 dsl_dataset_name(ds, buf); | |
| 2083 dsl_dataset_close(ds, DS_MODE_NONE, FTAG); | |
| 2084 rw_exit(&dp->dp_config_rwlock); | |
| 2085 spa_close(spa, FTAG); | |
| 2086 | |
| 2087 return (0); | |
| 2088 } |