module/zfs/dsl_deadlist.c

   1 /*
   2  * CDDL HEADER START
   3  *
   4  * The contents of this file are subject to the terms of the
   5  * Common Development and Distribution License (the "License").
   6  * You may not use this file except in compliance with the License.
   7  *
   8  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
   9  * or http://www.opensolaris.org/os/licensing.
  10  * See the License for the specific language governing permissions
  11  * and limitations under the License.
  12  *
  13  * When distributing Covered Code, include this CDDL HEADER in each
  14  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
  15  * If applicable, add the following below this CDDL HEADER, with the
  16  * fields enclosed by brackets "[]" replaced with your own identifying
  17  * information: Portions Copyright [yyyy] [name of copyright owner]
  18  *
  19  * CDDL HEADER END
  20  */
  21 /*
  22  * Copyright (c) 2010, Oracle and/or its affiliates. All rights reserved.
  23  */
  24
  25 #include <sys/dsl_dataset.h>
  26 #include <sys/dmu.h>
  27 #include <sys/refcount.h>
  28 #include <sys/zap.h>
  29 #include <sys/zfs_context.h>
  30 #include <sys/dsl_pool.h>
  31
  32 static int
  33 dsl_deadlist_compare(const void *arg1, const void *arg2)
  34 {
  35         const dsl_deadlist_entry_t *dle1 = arg1;
  36         const dsl_deadlist_entry_t *dle2 = arg2;
  37
  38         if (dle1->dle_mintxg < dle2->dle_mintxg)
  39                 return (-1);
  40         else if (dle1->dle_mintxg > dle2->dle_mintxg)
  41                 return (+1);
  42         else
  43                 return (0);
  44 }
  45
  46 static void
  47 dsl_deadlist_load_tree(dsl_deadlist_t *dl)
  48 {
  49         zap_cursor_t zc;
  50         zap_attribute_t za;
  51
  52         ASSERT(!dl->dl_oldfmt);
  53         if (dl->dl_havetree)
  54                 return;
  55
  56         avl_create(&dl->dl_tree, dsl_deadlist_compare,
  57             sizeof (dsl_deadlist_entry_t),
  58             offsetof(dsl_deadlist_entry_t, dle_node));
  59         for (zap_cursor_init(&zc, dl->dl_os, dl->dl_object);
  60             zap_cursor_retrieve(&zc, &za) == 0;
  61             zap_cursor_advance(&zc)) {
  62                 dsl_deadlist_entry_t *dle = kmem_alloc(sizeof (*dle), KM_SLEEP);
  63                 dle->dle_mintxg = strtonum(za.za_name, NULL);
  64                 VERIFY3U(0, ==, bpobj_open(&dle->dle_bpobj, dl->dl_os,
  65                     za.za_first_integer));
  66                 avl_add(&dl->dl_tree, dle);
  67         }
  68         zap_cursor_fini(&zc);
  69         dl->dl_havetree = B_TRUE;
  70 }
  71
  72 void
  73 dsl_deadlist_open(dsl_deadlist_t *dl, objset_t *os, uint64_t object)
  74 {
  75         dmu_object_info_t doi;
  76
  77         mutex_init(&dl->dl_lock, NULL, MUTEX_DEFAULT, NULL);
  78         dl->dl_os = os;
  79         dl->dl_object = object;
  80         VERIFY3U(0, ==, dmu_bonus_hold(os, object, dl, &dl->dl_dbuf));
  81         dmu_object_info_from_db(dl->dl_dbuf, &doi);
  82         if (doi.doi_type == DMU_OT_BPOBJ) {
  83                 dmu_buf_rele(dl->dl_dbuf, dl);
  84                 dl->dl_dbuf = NULL;
  85                 dl->dl_oldfmt = B_TRUE;
  86                 VERIFY3U(0, ==, bpobj_open(&dl->dl_bpobj, os, object));
  87                 return;
  88         }
  89
  90         dl->dl_oldfmt = B_FALSE;
  91         dl->dl_phys = dl->dl_dbuf->db_data;
  92         dl->dl_havetree = B_FALSE;
  93 }
  94
  95 void
  96 dsl_deadlist_close(dsl_deadlist_t *dl)
  97 {
  98         void *cookie = NULL;
  99         dsl_deadlist_entry_t *dle;
 100
 101         if (dl->dl_oldfmt) {
 102                 dl->dl_oldfmt = B_FALSE;
 103                 bpobj_close(&dl->dl_bpobj);
 104                 return;
 105         }
 106
 107         if (dl->dl_havetree) {
 108                 while ((dle = avl_destroy_nodes(&dl->dl_tree, &cookie))
 109                     != NULL) {
 110                         bpobj_close(&dle->dle_bpobj);
 111                         kmem_free(dle, sizeof (*dle));
 112                 }
 113                 avl_destroy(&dl->dl_tree);
 114         }
 115         dmu_buf_rele(dl->dl_dbuf, dl);
 116         mutex_destroy(&dl->dl_lock);
 117         dl->dl_dbuf = NULL;
 118         dl->dl_phys = NULL;
 119 }
 120
 121 uint64_t
 122 dsl_deadlist_alloc(objset_t *os, dmu_tx_t *tx)
 123 {
 124         if (spa_version(dmu_objset_spa(os)) < SPA_VERSION_DEADLISTS)
 125                 return (bpobj_alloc(os, SPA_MAXBLOCKSIZE, tx));
 126         return (zap_create(os, DMU_OT_DEADLIST, DMU_OT_DEADLIST_HDR,
 127             sizeof (dsl_deadlist_phys_t), tx));
 128 }
 129
 130 void
 131 dsl_deadlist_free(objset_t *os, uint64_t dlobj, dmu_tx_t *tx)
 132 {
 133         dmu_object_info_t doi;
 134         zap_cursor_t zc;
 135         zap_attribute_t za;
 136
 137         VERIFY3U(0, ==, dmu_object_info(os, dlobj, &doi));
 138         if (doi.doi_type == DMU_OT_BPOBJ) {
 139                 bpobj_free(os, dlobj, tx);
 140                 return;
 141         }
 142
 143         for (zap_cursor_init(&zc, os, dlobj);
 144             zap_cursor_retrieve(&zc, &za) == 0;
 145             zap_cursor_advance(&zc))
 146                 bpobj_free(os, za.za_first_integer, tx);
 147         zap_cursor_fini(&zc);
 148         VERIFY3U(0, ==, dmu_object_free(os, dlobj, tx));
 149 }
 150
 151 void
 152 dsl_deadlist_insert(dsl_deadlist_t *dl, const blkptr_t *bp, dmu_tx_t *tx)
 153 {
 154         dsl_deadlist_entry_t dle_tofind;
 155         dsl_deadlist_entry_t *dle;
 156         avl_index_t where;
 157
 158         if (dl->dl_oldfmt) {
 159                 bpobj_enqueue(&dl->dl_bpobj, bp, tx);
 160                 return;
 161         }
 162
 163         dsl_deadlist_load_tree(dl);
 164
 165         dmu_buf_will_dirty(dl->dl_dbuf, tx);
 166         mutex_enter(&dl->dl_lock);
 167         dl->dl_phys->dl_used +=
 168             bp_get_dsize_sync(dmu_objset_spa(dl->dl_os), bp);
 169         dl->dl_phys->dl_comp += BP_GET_PSIZE(bp);
 170         dl->dl_phys->dl_uncomp += BP_GET_UCSIZE(bp);
 171         mutex_exit(&dl->dl_lock);
 172
 173         dle_tofind.dle_mintxg = bp->blk_birth;
 174         dle = avl_find(&dl->dl_tree, &dle_tofind, &where);
 175         if (dle == NULL)
 176                 dle = avl_nearest(&dl->dl_tree, where, AVL_BEFORE);
 177         else
 178                 dle = AVL_PREV(&dl->dl_tree, dle);
 179         bpobj_enqueue(&dle->dle_bpobj, bp, tx);
 180 }
 181
 182 /*
 183  * Insert new key in deadlist, which must be > all current entries.
 184  * mintxg is not inclusive.
 185  */
 186 void
 187 dsl_deadlist_add_key(dsl_deadlist_t *dl, uint64_t mintxg, dmu_tx_t *tx)
 188 {
 189         uint64_t obj;
 190         dsl_deadlist_entry_t *dle;
 191
 192         if (dl->dl_oldfmt)
 193                 return;
 194
 195         dsl_deadlist_load_tree(dl);
 196
 197         dle = kmem_alloc(sizeof (*dle), KM_SLEEP);
 198         dle->dle_mintxg = mintxg;
 199         obj = bpobj_alloc(dl->dl_os, SPA_MAXBLOCKSIZE, tx);
 200         VERIFY3U(0, ==, bpobj_open(&dle->dle_bpobj, dl->dl_os, obj));
 201         avl_add(&dl->dl_tree, dle);
 202
 203         VERIFY3U(0, ==, zap_add_int_key(dl->dl_os, dl->dl_object,
 204             mintxg, obj, tx));
 205 }
 206
 207 /*
 208  * Remove this key, merging its entries into the previous key.
 209  */
 210 void
 211 dsl_deadlist_remove_key(dsl_deadlist_t *dl, uint64_t mintxg, dmu_tx_t *tx)
 212 {
 213         dsl_deadlist_entry_t dle_tofind;
 214         dsl_deadlist_entry_t *dle, *dle_prev;
 215
 216         if (dl->dl_oldfmt)
 217                 return;
 218
 219         dsl_deadlist_load_tree(dl);
 220
 221         dle_tofind.dle_mintxg = mintxg;
 222         dle = avl_find(&dl->dl_tree, &dle_tofind, NULL);
 223         dle_prev = AVL_PREV(&dl->dl_tree, dle);
 224
 225         bpobj_enqueue_subobj(&dle_prev->dle_bpobj,
 226             dle->dle_bpobj.bpo_object, tx);
 227
 228         avl_remove(&dl->dl_tree, dle);
 229         bpobj_close(&dle->dle_bpobj);
 230         kmem_free(dle, sizeof (*dle));
 231
 232         VERIFY3U(0, ==, zap_remove_int(dl->dl_os, dl->dl_object, mintxg, tx));
 233 }
 234
 235 /*
 236  * Walk ds's snapshots to regenerate generate ZAP & AVL.
 237  */
 238 static void
 239 dsl_deadlist_regenerate(objset_t *os, uint64_t dlobj,
 240     uint64_t mrs_obj, dmu_tx_t *tx)
 241 {
 242         dsl_deadlist_t dl;
 243         dsl_pool_t *dp = dmu_objset_pool(os);
 244
 245         dsl_deadlist_open(&dl, os, dlobj);
 246         if (dl.dl_oldfmt) {
 247                 dsl_deadlist_close(&dl);
 248                 return;
 249         }
 250
 251         while (mrs_obj != 0) {
 252                 dsl_dataset_t *ds;
 253                 VERIFY3U(0, ==, dsl_dataset_hold_obj(dp, mrs_obj, FTAG, &ds));
 254                 dsl_deadlist_add_key(&dl, ds->ds_phys->ds_prev_snap_txg, tx);
 255                 mrs_obj = ds->ds_phys->ds_prev_snap_obj;
 256                 dsl_dataset_rele(ds, FTAG);
 257         }
 258         dsl_deadlist_close(&dl);
 259 }
 260
 261 uint64_t
 262 dsl_deadlist_clone(dsl_deadlist_t *dl, uint64_t maxtxg,
 263     uint64_t mrs_obj, dmu_tx_t *tx)
 264 {
 265         dsl_deadlist_entry_t *dle;
 266         uint64_t newobj;
 267
 268         newobj = dsl_deadlist_alloc(dl->dl_os, tx);
 269
 270         if (dl->dl_oldfmt) {
 271                 dsl_deadlist_regenerate(dl->dl_os, newobj, mrs_obj, tx);
 272                 return (newobj);
 273         }
 274
 275         dsl_deadlist_load_tree(dl);
 276
 277         for (dle = avl_first(&dl->dl_tree); dle;
 278             dle = AVL_NEXT(&dl->dl_tree, dle)) {
 279                 uint64_t obj;
 280
 281                 if (dle->dle_mintxg >= maxtxg)
 282                         break;
 283
 284                 obj = bpobj_alloc(dl->dl_os, SPA_MAXBLOCKSIZE, tx);
 285                 VERIFY3U(0, ==, zap_add_int_key(dl->dl_os, newobj,
 286                     dle->dle_mintxg, obj, tx));
 287         }
 288         return (newobj);
 289 }
 290
 291 void
 292 dsl_deadlist_space(dsl_deadlist_t *dl,
 293     uint64_t *usedp, uint64_t *compp, uint64_t *uncompp)
 294 {
 295         if (dl->dl_oldfmt) {
 296                 VERIFY3U(0, ==, bpobj_space(&dl->dl_bpobj,
 297                     usedp, compp, uncompp));
 298                 return;
 299         }
 300
 301         mutex_enter(&dl->dl_lock);
 302         *usedp = dl->dl_phys->dl_used;
 303         *compp = dl->dl_phys->dl_comp;
 304         *uncompp = dl->dl_phys->dl_uncomp;
 305         mutex_exit(&dl->dl_lock);
 306 }
 307
 308 /*
 309  * return space used in the range (mintxg, maxtxg].
 310  * Includes maxtxg, does not include mintxg.
 311  * mintxg and maxtxg must both be keys in the deadlist (unless maxtxg is
 312  * UINT64_MAX).
 313  */
 314 void
 315 dsl_deadlist_space_range(dsl_deadlist_t *dl, uint64_t mintxg, uint64_t maxtxg,
 316     uint64_t *usedp, uint64_t *compp, uint64_t *uncompp)
 317 {
 318         dsl_deadlist_entry_t dle_tofind;
 319         dsl_deadlist_entry_t *dle;
 320         avl_index_t where;
 321
 322         if (dl->dl_oldfmt) {
 323                 VERIFY3U(0, ==, bpobj_space_range(&dl->dl_bpobj,
 324                     mintxg, maxtxg, usedp, compp, uncompp));
 325                 return;
 326         }
 327
 328         dsl_deadlist_load_tree(dl);
 329         *usedp = *compp = *uncompp = 0;
 330
 331         dle_tofind.dle_mintxg = mintxg;
 332         dle = avl_find(&dl->dl_tree, &dle_tofind, &where);
 333         /*
 334          * If we don't find this mintxg, there shouldn't be anything
 335          * after it either.
 336          */
 337         ASSERT(dle != NULL ||
 338             avl_nearest(&dl->dl_tree, where, AVL_AFTER) == NULL);
 339         for (; dle && dle->dle_mintxg < maxtxg;
 340             dle = AVL_NEXT(&dl->dl_tree, dle)) {
 341                 uint64_t used, comp, uncomp;
 342
 343                 VERIFY3U(0, ==, bpobj_space(&dle->dle_bpobj,
 344                     &used, &comp, &uncomp));
 345
 346                 *usedp += used;
 347                 *compp += comp;
 348                 *uncompp += uncomp;
 349         }
 350 }
 351
 352 static void
 353 dsl_deadlist_insert_bpobj(dsl_deadlist_t *dl, uint64_t obj, uint64_t birth,
 354     dmu_tx_t *tx)
 355 {
 356         dsl_deadlist_entry_t dle_tofind;
 357         dsl_deadlist_entry_t *dle;
 358         avl_index_t where;
 359         uint64_t used, comp, uncomp;
 360         bpobj_t bpo;
 361
 362         VERIFY3U(0, ==, bpobj_open(&bpo, dl->dl_os, obj));
 363         VERIFY3U(0, ==, bpobj_space(&bpo, &used, &comp, &uncomp));
 364         bpobj_close(&bpo);
 365
 366         dsl_deadlist_load_tree(dl);
 367
 368         dmu_buf_will_dirty(dl->dl_dbuf, tx);
 369         mutex_enter(&dl->dl_lock);
 370         dl->dl_phys->dl_used += used;
 371         dl->dl_phys->dl_comp += comp;
 372         dl->dl_phys->dl_uncomp += uncomp;
 373         mutex_exit(&dl->dl_lock);
 374
 375         dle_tofind.dle_mintxg = birth;
 376         dle = avl_find(&dl->dl_tree, &dle_tofind, &where);
 377         if (dle == NULL)
 378                 dle = avl_nearest(&dl->dl_tree, where, AVL_BEFORE);
 379         bpobj_enqueue_subobj(&dle->dle_bpobj, obj, tx);
 380 }
 381
 382 static int
 383 dsl_deadlist_insert_cb(void *arg, const blkptr_t *bp, dmu_tx_t *tx)
 384 {
 385         dsl_deadlist_t *dl = arg;
 386         dsl_deadlist_insert(dl, bp, tx);
 387         return (0);
 388 }
 389
 390 /*
 391  * Merge the deadlist pointed to by 'obj' into dl.  obj will be left as
 392  * an empty deadlist.
 393  */
 394 void
 395 dsl_deadlist_merge(dsl_deadlist_t *dl, uint64_t obj, dmu_tx_t *tx)
 396 {
 397         zap_cursor_t zc;
 398         zap_attribute_t za;
 399         dmu_buf_t *bonus;
 400         dsl_deadlist_phys_t *dlp;
 401         dmu_object_info_t doi;
 402
 403         VERIFY3U(0, ==, dmu_object_info(dl->dl_os, obj, &doi));
 404         if (doi.doi_type == DMU_OT_BPOBJ) {
 405                 bpobj_t bpo;
 406                 VERIFY3U(0, ==, bpobj_open(&bpo, dl->dl_os, obj));
 407                 VERIFY3U(0, ==, bpobj_iterate(&bpo,
 408                     dsl_deadlist_insert_cb, dl, tx));
 409                 bpobj_close(&bpo);
 410                 return;
 411         }
 412
 413         for (zap_cursor_init(&zc, dl->dl_os, obj);
 414             zap_cursor_retrieve(&zc, &za) == 0;
 415             zap_cursor_advance(&zc)) {
 416                 uint64_t mintxg = strtonum(za.za_name, NULL);
 417                 dsl_deadlist_insert_bpobj(dl, za.za_first_integer, mintxg, tx);
 418                 VERIFY3U(0, ==, zap_remove_int(dl->dl_os, obj, mintxg, tx));
 419         }
 420         zap_cursor_fini(&zc);
 421
 422         VERIFY3U(0, ==, dmu_bonus_hold(dl->dl_os, obj, FTAG, &bonus));
 423         dlp = bonus->db_data;
 424         dmu_buf_will_dirty(bonus, tx);
 425         bzero(dlp, sizeof (*dlp));
 426         dmu_buf_rele(bonus, FTAG);
 427 }
 428
 429 /*
 430  * Remove entries on dl that are >= mintxg, and put them on the bpobj.
 431  */
 432 void
 433 dsl_deadlist_move_bpobj(dsl_deadlist_t *dl, bpobj_t *bpo, uint64_t mintxg,
 434     dmu_tx_t *tx)
 435 {
 436         dsl_deadlist_entry_t dle_tofind;
 437         dsl_deadlist_entry_t *dle;
 438         avl_index_t where;
 439
 440         ASSERT(!dl->dl_oldfmt);
 441         dmu_buf_will_dirty(dl->dl_dbuf, tx);
 442         dsl_deadlist_load_tree(dl);
 443
 444         dle_tofind.dle_mintxg = mintxg;
 445         dle = avl_find(&dl->dl_tree, &dle_tofind, &where);
 446         if (dle == NULL)
 447                 dle = avl_nearest(&dl->dl_tree, where, AVL_AFTER);
 448         while (dle) {
 449                 uint64_t used, comp, uncomp;
 450                 dsl_deadlist_entry_t *dle_next;
 451
 452                 bpobj_enqueue_subobj(bpo, dle->dle_bpobj.bpo_object, tx);
 453
 454                 VERIFY3U(0, ==, bpobj_space(&dle->dle_bpobj,
 455                     &used, &comp, &uncomp));
 456                 mutex_enter(&dl->dl_lock);
 457                 ASSERT3U(dl->dl_phys->dl_used, >=, used);
 458                 ASSERT3U(dl->dl_phys->dl_comp, >=, comp);
 459                 ASSERT3U(dl->dl_phys->dl_uncomp, >=, uncomp);
 460                 dl->dl_phys->dl_used -= used;
 461                 dl->dl_phys->dl_comp -= comp;
 462                 dl->dl_phys->dl_uncomp -= uncomp;
 463                 mutex_exit(&dl->dl_lock);
 464
 465                 VERIFY3U(0, ==, zap_remove_int(dl->dl_os, dl->dl_object,
 466                     dle->dle_mintxg, tx));
 467
 468                 dle_next = AVL_NEXT(&dl->dl_tree, dle);
 469                 avl_remove(&dl->dl_tree, dle);
 470                 bpobj_close(&dle->dle_bpobj);
 471                 kmem_free(dle, sizeof (*dle));
 472                 dle = dle_next;
 473         }
 474 }