1fa9e4066Sahrens /* 2fa9e4066Sahrens * CDDL HEADER START 3fa9e4066Sahrens * 4fa9e4066Sahrens * The contents of this file are subject to the terms of the 5ea8dc4b6Seschrock * Common Development and Distribution License (the "License"). 6ea8dc4b6Seschrock * You may not use this file except in compliance with the License. 7fa9e4066Sahrens * 8fa9e4066Sahrens * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 9fa9e4066Sahrens * or http://www.opensolaris.org/os/licensing. 10fa9e4066Sahrens * See the License for the specific language governing permissions 11fa9e4066Sahrens * and limitations under the License. 12fa9e4066Sahrens * 13fa9e4066Sahrens * When distributing Covered Code, include this CDDL HEADER in each 14fa9e4066Sahrens * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 15fa9e4066Sahrens * If applicable, add the following below this CDDL HEADER, with the 16fa9e4066Sahrens * fields enclosed by brackets "[]" replaced with your own identifying 17fa9e4066Sahrens * information: Portions Copyright [yyyy] [name of copyright owner] 18fa9e4066Sahrens * 19fa9e4066Sahrens * CDDL HEADER END 20fa9e4066Sahrens */ 21fa9e4066Sahrens /* 22ea8dc4b6Seschrock * Copyright 2006 Sun Microsystems, Inc. All rights reserved. 23fa9e4066Sahrens * Use is subject to license terms. 24fa9e4066Sahrens */ 25fa9e4066Sahrens 26fa9e4066Sahrens #pragma ident "%Z%%M% %I% %E% SMI" 27fa9e4066Sahrens 28fa9e4066Sahrens #include <sys/zfs_context.h> 29fa9e4066Sahrens #include <sys/dmu_objset.h> 30fa9e4066Sahrens #include <sys/dsl_dir.h> 31fa9e4066Sahrens #include <sys/dsl_dataset.h> 32fa9e4066Sahrens #include <sys/dsl_prop.h> 33fa9e4066Sahrens #include <sys/dsl_pool.h> 34*1d452cf5Sahrens #include <sys/dsl_synctask.h> 35fa9e4066Sahrens #include <sys/dnode.h> 36fa9e4066Sahrens #include <sys/dbuf.h> 37fa9e4066Sahrens #include <sys/dmu_tx.h> 38fa9e4066Sahrens #include <sys/zio_checksum.h> 39fa9e4066Sahrens #include <sys/zap.h> 40fa9e4066Sahrens #include <sys/zil.h> 41fa9e4066Sahrens #include <sys/dmu_impl.h> 42fa9e4066Sahrens 43fa9e4066Sahrens 44fa9e4066Sahrens spa_t * 45fa9e4066Sahrens dmu_objset_spa(objset_t *os) 46fa9e4066Sahrens { 47fa9e4066Sahrens return (os->os->os_spa); 48fa9e4066Sahrens } 49fa9e4066Sahrens 50fa9e4066Sahrens zilog_t * 51fa9e4066Sahrens dmu_objset_zil(objset_t *os) 52fa9e4066Sahrens { 53fa9e4066Sahrens return (os->os->os_zil); 54fa9e4066Sahrens } 55fa9e4066Sahrens 56fa9e4066Sahrens dsl_pool_t * 57fa9e4066Sahrens dmu_objset_pool(objset_t *os) 58fa9e4066Sahrens { 59fa9e4066Sahrens dsl_dataset_t *ds; 60fa9e4066Sahrens 61fa9e4066Sahrens if ((ds = os->os->os_dsl_dataset) != NULL && ds->ds_dir) 62fa9e4066Sahrens return (ds->ds_dir->dd_pool); 63fa9e4066Sahrens else 64fa9e4066Sahrens return (spa_get_dsl(os->os->os_spa)); 65fa9e4066Sahrens } 66fa9e4066Sahrens 67fa9e4066Sahrens dsl_dataset_t * 68fa9e4066Sahrens dmu_objset_ds(objset_t *os) 69fa9e4066Sahrens { 70fa9e4066Sahrens return (os->os->os_dsl_dataset); 71fa9e4066Sahrens } 72fa9e4066Sahrens 73fa9e4066Sahrens dmu_objset_type_t 74fa9e4066Sahrens dmu_objset_type(objset_t *os) 75fa9e4066Sahrens { 76fa9e4066Sahrens return (os->os->os_phys->os_type); 77fa9e4066Sahrens } 78fa9e4066Sahrens 79fa9e4066Sahrens void 80fa9e4066Sahrens dmu_objset_name(objset_t *os, char *buf) 81fa9e4066Sahrens { 82fa9e4066Sahrens dsl_dataset_name(os->os->os_dsl_dataset, buf); 83fa9e4066Sahrens } 84fa9e4066Sahrens 85fa9e4066Sahrens uint64_t 86fa9e4066Sahrens dmu_objset_id(objset_t *os) 87fa9e4066Sahrens { 88fa9e4066Sahrens dsl_dataset_t *ds = os->os->os_dsl_dataset; 89fa9e4066Sahrens 90fa9e4066Sahrens return (ds ? ds->ds_object : 0); 91fa9e4066Sahrens } 92fa9e4066Sahrens 93fa9e4066Sahrens static void 94fa9e4066Sahrens checksum_changed_cb(void *arg, uint64_t newval) 95fa9e4066Sahrens { 96fa9e4066Sahrens objset_impl_t *osi = arg; 97fa9e4066Sahrens 98fa9e4066Sahrens /* 99fa9e4066Sahrens * Inheritance should have been done by now. 100fa9e4066Sahrens */ 101fa9e4066Sahrens ASSERT(newval != ZIO_CHECKSUM_INHERIT); 102fa9e4066Sahrens 103fa9e4066Sahrens osi->os_checksum = zio_checksum_select(newval, ZIO_CHECKSUM_ON_VALUE); 104fa9e4066Sahrens } 105fa9e4066Sahrens 106fa9e4066Sahrens static void 107fa9e4066Sahrens compression_changed_cb(void *arg, uint64_t newval) 108fa9e4066Sahrens { 109fa9e4066Sahrens objset_impl_t *osi = arg; 110fa9e4066Sahrens 111fa9e4066Sahrens /* 112fa9e4066Sahrens * Inheritance and range checking should have been done by now. 113fa9e4066Sahrens */ 114fa9e4066Sahrens ASSERT(newval != ZIO_COMPRESS_INHERIT); 115fa9e4066Sahrens 116fa9e4066Sahrens osi->os_compress = zio_compress_select(newval, ZIO_COMPRESS_ON_VALUE); 117fa9e4066Sahrens } 118fa9e4066Sahrens 119fa9e4066Sahrens void 120fa9e4066Sahrens dmu_objset_byteswap(void *buf, size_t size) 121fa9e4066Sahrens { 122fa9e4066Sahrens objset_phys_t *osp = buf; 123fa9e4066Sahrens 124fa9e4066Sahrens ASSERT(size == sizeof (objset_phys_t)); 125fa9e4066Sahrens dnode_byteswap(&osp->os_meta_dnode); 126fa9e4066Sahrens byteswap_uint64_array(&osp->os_zil_header, sizeof (zil_header_t)); 127fa9e4066Sahrens osp->os_type = BSWAP_64(osp->os_type); 128fa9e4066Sahrens } 129fa9e4066Sahrens 130ea8dc4b6Seschrock int 131ea8dc4b6Seschrock dmu_objset_open_impl(spa_t *spa, dsl_dataset_t *ds, blkptr_t *bp, 132ea8dc4b6Seschrock objset_impl_t **osip) 133fa9e4066Sahrens { 134fa9e4066Sahrens objset_impl_t *winner, *osi; 135fa9e4066Sahrens int i, err, checksum; 136fa9e4066Sahrens 137fa9e4066Sahrens osi = kmem_zalloc(sizeof (objset_impl_t), KM_SLEEP); 138fa9e4066Sahrens osi->os.os = osi; 139fa9e4066Sahrens osi->os_dsl_dataset = ds; 140fa9e4066Sahrens osi->os_spa = spa; 141fa9e4066Sahrens if (bp) 142fa9e4066Sahrens osi->os_rootbp = *bp; 143fa9e4066Sahrens osi->os_phys = zio_buf_alloc(sizeof (objset_phys_t)); 144fa9e4066Sahrens if (!BP_IS_HOLE(&osi->os_rootbp)) { 145ea8dc4b6Seschrock zbookmark_t zb; 146ea8dc4b6Seschrock zb.zb_objset = ds ? ds->ds_object : 0; 147ea8dc4b6Seschrock zb.zb_object = 0; 148ea8dc4b6Seschrock zb.zb_level = -1; 149ea8dc4b6Seschrock zb.zb_blkid = 0; 150ea8dc4b6Seschrock 151fa9e4066Sahrens dprintf_bp(&osi->os_rootbp, "reading %s", ""); 152ea8dc4b6Seschrock err = arc_read(NULL, spa, &osi->os_rootbp, 153fa9e4066Sahrens dmu_ot[DMU_OT_OBJSET].ot_byteswap, 154fa9e4066Sahrens arc_bcopy_func, osi->os_phys, 155ea8dc4b6Seschrock ZIO_PRIORITY_SYNC_READ, ZIO_FLAG_CANFAIL, ARC_WAIT, &zb); 156ea8dc4b6Seschrock if (err) { 157ea8dc4b6Seschrock zio_buf_free(osi->os_phys, sizeof (objset_phys_t)); 158ea8dc4b6Seschrock kmem_free(osi, sizeof (objset_impl_t)); 159ea8dc4b6Seschrock return (err); 160ea8dc4b6Seschrock } 161fa9e4066Sahrens } else { 162fa9e4066Sahrens bzero(osi->os_phys, sizeof (objset_phys_t)); 163fa9e4066Sahrens } 164fa9e4066Sahrens 165fa9e4066Sahrens /* 166fa9e4066Sahrens * Note: the changed_cb will be called once before the register 167fa9e4066Sahrens * func returns, thus changing the checksum/compression from the 16899653d4eSeschrock * default (fletcher2/off). Snapshots don't need to know, and 16999653d4eSeschrock * registering would complicate clone promotion. 170fa9e4066Sahrens */ 17199653d4eSeschrock if (ds && ds->ds_phys->ds_num_children == 0) { 172fa9e4066Sahrens err = dsl_prop_register(ds, "checksum", 173fa9e4066Sahrens checksum_changed_cb, osi); 174ea8dc4b6Seschrock if (err == 0) 175ea8dc4b6Seschrock err = dsl_prop_register(ds, "compression", 176ea8dc4b6Seschrock compression_changed_cb, osi); 177ea8dc4b6Seschrock if (err) { 178ea8dc4b6Seschrock zio_buf_free(osi->os_phys, sizeof (objset_phys_t)); 179ea8dc4b6Seschrock kmem_free(osi, sizeof (objset_impl_t)); 180ea8dc4b6Seschrock return (err); 181ea8dc4b6Seschrock } 18299653d4eSeschrock } else if (ds == NULL) { 183fa9e4066Sahrens /* It's the meta-objset. */ 184fa9e4066Sahrens osi->os_checksum = ZIO_CHECKSUM_FLETCHER_4; 185ea8dc4b6Seschrock osi->os_compress = ZIO_COMPRESS_LZJB; 186fa9e4066Sahrens } 187fa9e4066Sahrens 188ea8dc4b6Seschrock osi->os_zil = zil_alloc(&osi->os, &osi->os_phys->os_zil_header); 189ea8dc4b6Seschrock 190fa9e4066Sahrens /* 191fa9e4066Sahrens * Metadata always gets compressed and checksummed. 192fa9e4066Sahrens * If the data checksum is multi-bit correctable, and it's not 193fa9e4066Sahrens * a ZBT-style checksum, then it's suitable for metadata as well. 194fa9e4066Sahrens * Otherwise, the metadata checksum defaults to fletcher4. 195fa9e4066Sahrens */ 196fa9e4066Sahrens checksum = osi->os_checksum; 197fa9e4066Sahrens 198fa9e4066Sahrens if (zio_checksum_table[checksum].ci_correctable && 199fa9e4066Sahrens !zio_checksum_table[checksum].ci_zbt) 200fa9e4066Sahrens osi->os_md_checksum = checksum; 201fa9e4066Sahrens else 202fa9e4066Sahrens osi->os_md_checksum = ZIO_CHECKSUM_FLETCHER_4; 203ea8dc4b6Seschrock osi->os_md_compress = ZIO_COMPRESS_LZJB; 204fa9e4066Sahrens 205fa9e4066Sahrens for (i = 0; i < TXG_SIZE; i++) { 206fa9e4066Sahrens list_create(&osi->os_dirty_dnodes[i], sizeof (dnode_t), 207fa9e4066Sahrens offsetof(dnode_t, dn_dirty_link[i])); 208fa9e4066Sahrens list_create(&osi->os_free_dnodes[i], sizeof (dnode_t), 209fa9e4066Sahrens offsetof(dnode_t, dn_dirty_link[i])); 210fa9e4066Sahrens } 211fa9e4066Sahrens list_create(&osi->os_dnodes, sizeof (dnode_t), 212fa9e4066Sahrens offsetof(dnode_t, dn_link)); 213fa9e4066Sahrens list_create(&osi->os_downgraded_dbufs, sizeof (dmu_buf_impl_t), 214fa9e4066Sahrens offsetof(dmu_buf_impl_t, db_link)); 215fa9e4066Sahrens 216fa9e4066Sahrens osi->os_meta_dnode = dnode_special_open(osi, 217fa9e4066Sahrens &osi->os_phys->os_meta_dnode, DMU_META_DNODE_OBJECT); 218fa9e4066Sahrens 219fa9e4066Sahrens if (ds != NULL) { 220fa9e4066Sahrens winner = dsl_dataset_set_user_ptr(ds, osi, dmu_objset_evict); 221fa9e4066Sahrens if (winner) { 222fa9e4066Sahrens dmu_objset_evict(ds, osi); 223fa9e4066Sahrens osi = winner; 224fa9e4066Sahrens } 225fa9e4066Sahrens } 226fa9e4066Sahrens 227ea8dc4b6Seschrock *osip = osi; 228ea8dc4b6Seschrock return (0); 229fa9e4066Sahrens } 230fa9e4066Sahrens 231fa9e4066Sahrens /* called from zpl */ 232fa9e4066Sahrens int 233fa9e4066Sahrens dmu_objset_open(const char *name, dmu_objset_type_t type, int mode, 234fa9e4066Sahrens objset_t **osp) 235fa9e4066Sahrens { 236fa9e4066Sahrens dsl_dataset_t *ds; 237fa9e4066Sahrens int err; 238fa9e4066Sahrens objset_t *os; 239fa9e4066Sahrens objset_impl_t *osi; 240fa9e4066Sahrens 241fa9e4066Sahrens os = kmem_alloc(sizeof (objset_t), KM_SLEEP); 242fa9e4066Sahrens err = dsl_dataset_open(name, mode, os, &ds); 243fa9e4066Sahrens if (err) { 244fa9e4066Sahrens kmem_free(os, sizeof (objset_t)); 245fa9e4066Sahrens return (err); 246fa9e4066Sahrens } 247fa9e4066Sahrens 248fa9e4066Sahrens osi = dsl_dataset_get_user_ptr(ds); 249fa9e4066Sahrens if (osi == NULL) { 250fa9e4066Sahrens blkptr_t bp; 251fa9e4066Sahrens 252fa9e4066Sahrens dsl_dataset_get_blkptr(ds, &bp); 253ea8dc4b6Seschrock err = dmu_objset_open_impl(dsl_dataset_get_spa(ds), 254ea8dc4b6Seschrock ds, &bp, &osi); 255ea8dc4b6Seschrock if (err) { 256ea8dc4b6Seschrock dsl_dataset_close(ds, mode, os); 257ea8dc4b6Seschrock kmem_free(os, sizeof (objset_t)); 258ea8dc4b6Seschrock return (err); 259ea8dc4b6Seschrock } 260fa9e4066Sahrens } 261fa9e4066Sahrens 262fa9e4066Sahrens os->os = osi; 263fa9e4066Sahrens os->os_mode = mode; 264fa9e4066Sahrens 265fa9e4066Sahrens if (type != DMU_OST_ANY && type != os->os->os_phys->os_type) { 266fa9e4066Sahrens dmu_objset_close(os); 267fa9e4066Sahrens return (EINVAL); 268fa9e4066Sahrens } 269fa9e4066Sahrens *osp = os; 270fa9e4066Sahrens return (0); 271fa9e4066Sahrens } 272fa9e4066Sahrens 273fa9e4066Sahrens void 274fa9e4066Sahrens dmu_objset_close(objset_t *os) 275fa9e4066Sahrens { 276fa9e4066Sahrens dsl_dataset_close(os->os->os_dsl_dataset, os->os_mode, os); 277fa9e4066Sahrens kmem_free(os, sizeof (objset_t)); 278fa9e4066Sahrens } 279fa9e4066Sahrens 280436b2950Sperrin int 281436b2950Sperrin dmu_objset_evict_dbufs(objset_t *os, int try) 282ea8dc4b6Seschrock { 283ea8dc4b6Seschrock objset_impl_t *osi = os->os; 284ea8dc4b6Seschrock dnode_t *dn; 285c543ec06Sahrens 286c543ec06Sahrens mutex_enter(&osi->os_lock); 287c543ec06Sahrens 288c543ec06Sahrens /* process the mdn last, since the other dnodes have holds on it */ 289c543ec06Sahrens list_remove(&osi->os_dnodes, osi->os_meta_dnode); 290c543ec06Sahrens list_insert_tail(&osi->os_dnodes, osi->os_meta_dnode); 291ea8dc4b6Seschrock 292ea8dc4b6Seschrock /* 293c543ec06Sahrens * Find the first dnode with holds. We have to do this dance 294c543ec06Sahrens * because dnode_add_ref() only works if you already have a 295c543ec06Sahrens * hold. If there are no holds then it has no dbufs so OK to 296c543ec06Sahrens * skip. 297ea8dc4b6Seschrock */ 298c543ec06Sahrens for (dn = list_head(&osi->os_dnodes); 299c543ec06Sahrens dn && refcount_is_zero(&dn->dn_holds); 300c543ec06Sahrens dn = list_next(&osi->os_dnodes, dn)) 301c543ec06Sahrens continue; 302c543ec06Sahrens if (dn) 303c543ec06Sahrens dnode_add_ref(dn, FTAG); 304c543ec06Sahrens 305c543ec06Sahrens while (dn) { 306c543ec06Sahrens dnode_t *next_dn = dn; 307c543ec06Sahrens 308c543ec06Sahrens do { 309c543ec06Sahrens next_dn = list_next(&osi->os_dnodes, next_dn); 310c543ec06Sahrens } while (next_dn && refcount_is_zero(&next_dn->dn_holds)); 311c543ec06Sahrens if (next_dn) 312c543ec06Sahrens dnode_add_ref(next_dn, FTAG); 313c543ec06Sahrens 314c543ec06Sahrens mutex_exit(&osi->os_lock); 315436b2950Sperrin if (dnode_evict_dbufs(dn, try)) { 316436b2950Sperrin dnode_rele(dn, FTAG); 317436b2950Sperrin if (next_dn) 318436b2950Sperrin dnode_rele(next_dn, FTAG); 319436b2950Sperrin return (1); 320436b2950Sperrin } 321c543ec06Sahrens dnode_rele(dn, FTAG); 322c543ec06Sahrens mutex_enter(&osi->os_lock); 323c543ec06Sahrens dn = next_dn; 324ea8dc4b6Seschrock } 325ea8dc4b6Seschrock mutex_exit(&osi->os_lock); 326436b2950Sperrin return (0); 327ea8dc4b6Seschrock } 328ea8dc4b6Seschrock 329fa9e4066Sahrens void 330fa9e4066Sahrens dmu_objset_evict(dsl_dataset_t *ds, void *arg) 331fa9e4066Sahrens { 332fa9e4066Sahrens objset_impl_t *osi = arg; 333ea8dc4b6Seschrock objset_t os; 33499653d4eSeschrock int i; 335fa9e4066Sahrens 336fa9e4066Sahrens for (i = 0; i < TXG_SIZE; i++) { 337fa9e4066Sahrens ASSERT(list_head(&osi->os_dirty_dnodes[i]) == NULL); 338fa9e4066Sahrens ASSERT(list_head(&osi->os_free_dnodes[i]) == NULL); 339fa9e4066Sahrens } 340fa9e4066Sahrens 34199653d4eSeschrock if (ds && ds->ds_phys->ds_num_children == 0) { 34299653d4eSeschrock VERIFY(0 == dsl_prop_unregister(ds, "checksum", 34399653d4eSeschrock checksum_changed_cb, osi)); 34499653d4eSeschrock VERIFY(0 == dsl_prop_unregister(ds, "compression", 34599653d4eSeschrock compression_changed_cb, osi)); 346fa9e4066Sahrens } 347fa9e4066Sahrens 348ea8dc4b6Seschrock /* 349ea8dc4b6Seschrock * We should need only a single pass over the dnode list, since 350ea8dc4b6Seschrock * nothing can be added to the list at this point. 351ea8dc4b6Seschrock */ 352ea8dc4b6Seschrock os.os = osi; 353436b2950Sperrin (void) dmu_objset_evict_dbufs(&os, 0); 354ea8dc4b6Seschrock 355fa9e4066Sahrens ASSERT3P(list_head(&osi->os_dnodes), ==, osi->os_meta_dnode); 356fa9e4066Sahrens ASSERT3P(list_tail(&osi->os_dnodes), ==, osi->os_meta_dnode); 357fa9e4066Sahrens ASSERT3P(list_head(&osi->os_meta_dnode->dn_dbufs), ==, NULL); 358fa9e4066Sahrens 359fa9e4066Sahrens dnode_special_close(osi->os_meta_dnode); 360fa9e4066Sahrens zil_free(osi->os_zil); 361fa9e4066Sahrens 362fa9e4066Sahrens zio_buf_free(osi->os_phys, sizeof (objset_phys_t)); 363fa9e4066Sahrens kmem_free(osi, sizeof (objset_impl_t)); 364fa9e4066Sahrens } 365fa9e4066Sahrens 366fa9e4066Sahrens /* called from dsl for meta-objset */ 367fa9e4066Sahrens objset_impl_t * 368fa9e4066Sahrens dmu_objset_create_impl(spa_t *spa, dsl_dataset_t *ds, dmu_objset_type_t type, 369fa9e4066Sahrens dmu_tx_t *tx) 370fa9e4066Sahrens { 371fa9e4066Sahrens objset_impl_t *osi; 372fa9e4066Sahrens dnode_t *mdn; 373fa9e4066Sahrens 374fa9e4066Sahrens ASSERT(dmu_tx_is_syncing(tx)); 375ea8dc4b6Seschrock VERIFY(0 == dmu_objset_open_impl(spa, ds, NULL, &osi)); 376fa9e4066Sahrens mdn = osi->os_meta_dnode; 377fa9e4066Sahrens 378fa9e4066Sahrens dnode_allocate(mdn, DMU_OT_DNODE, 1 << DNODE_BLOCK_SHIFT, 379fa9e4066Sahrens DN_MAX_INDBLKSHIFT, DMU_OT_NONE, 0, tx); 380fa9e4066Sahrens 381fa9e4066Sahrens /* 382fa9e4066Sahrens * We don't want to have to increase the meta-dnode's nlevels 383fa9e4066Sahrens * later, because then we could do it in quescing context while 384fa9e4066Sahrens * we are also accessing it in open context. 385fa9e4066Sahrens * 386fa9e4066Sahrens * This precaution is not necessary for the MOS (ds == NULL), 387fa9e4066Sahrens * because the MOS is only updated in syncing context. 388fa9e4066Sahrens * This is most fortunate: the MOS is the only objset that 389fa9e4066Sahrens * needs to be synced multiple times as spa_sync() iterates 390fa9e4066Sahrens * to convergence, so minimizing its dn_nlevels matters. 391fa9e4066Sahrens */ 392ea8dc4b6Seschrock if (ds != NULL) { 393ea8dc4b6Seschrock int levels = 1; 394ea8dc4b6Seschrock 395ea8dc4b6Seschrock /* 396ea8dc4b6Seschrock * Determine the number of levels necessary for the meta-dnode 397ea8dc4b6Seschrock * to contain DN_MAX_OBJECT dnodes. 398ea8dc4b6Seschrock */ 399ea8dc4b6Seschrock while ((uint64_t)mdn->dn_nblkptr << (mdn->dn_datablkshift + 400ea8dc4b6Seschrock (levels - 1) * (mdn->dn_indblkshift - SPA_BLKPTRSHIFT)) < 401ea8dc4b6Seschrock DN_MAX_OBJECT * sizeof (dnode_phys_t)) 402ea8dc4b6Seschrock levels++; 403ea8dc4b6Seschrock 404fa9e4066Sahrens mdn->dn_next_nlevels[tx->tx_txg & TXG_MASK] = 405ea8dc4b6Seschrock mdn->dn_nlevels = levels; 406ea8dc4b6Seschrock } 407fa9e4066Sahrens 408fa9e4066Sahrens ASSERT(type != DMU_OST_NONE); 409fa9e4066Sahrens ASSERT(type != DMU_OST_ANY); 410fa9e4066Sahrens ASSERT(type < DMU_OST_NUMTYPES); 411fa9e4066Sahrens osi->os_phys->os_type = type; 412fa9e4066Sahrens 413fa9e4066Sahrens dsl_dataset_dirty(ds, tx); 414fa9e4066Sahrens 415fa9e4066Sahrens return (osi); 416fa9e4066Sahrens } 417fa9e4066Sahrens 418fa9e4066Sahrens struct oscarg { 419fa9e4066Sahrens void (*userfunc)(objset_t *os, void *arg, dmu_tx_t *tx); 420fa9e4066Sahrens void *userarg; 421fa9e4066Sahrens dsl_dataset_t *clone_parent; 422fa9e4066Sahrens const char *lastname; 423fa9e4066Sahrens dmu_objset_type_t type; 424fa9e4066Sahrens }; 425fa9e4066Sahrens 426*1d452cf5Sahrens /* ARGSUSED */ 427fa9e4066Sahrens static int 428*1d452cf5Sahrens dmu_objset_create_check(void *arg1, void *arg2, dmu_tx_t *tx) 429fa9e4066Sahrens { 430*1d452cf5Sahrens dsl_dir_t *dd = arg1; 431*1d452cf5Sahrens struct oscarg *oa = arg2; 432*1d452cf5Sahrens objset_t *mos = dd->dd_pool->dp_meta_objset; 433fa9e4066Sahrens int err; 434*1d452cf5Sahrens uint64_t ddobj; 435*1d452cf5Sahrens 436*1d452cf5Sahrens err = zap_lookup(mos, dd->dd_phys->dd_child_dir_zapobj, 437*1d452cf5Sahrens oa->lastname, sizeof (uint64_t), 1, &ddobj); 438*1d452cf5Sahrens if (err != ENOENT) 439*1d452cf5Sahrens return (err ? err : EEXIST); 440*1d452cf5Sahrens 441*1d452cf5Sahrens if (oa->clone_parent != NULL) { 442*1d452cf5Sahrens /* 443*1d452cf5Sahrens * You can't clone across pools. 444*1d452cf5Sahrens */ 445*1d452cf5Sahrens if (oa->clone_parent->ds_dir->dd_pool != dd->dd_pool) 446*1d452cf5Sahrens return (EXDEV); 447*1d452cf5Sahrens 448*1d452cf5Sahrens /* 449*1d452cf5Sahrens * You can only clone snapshots, not the head datasets. 450*1d452cf5Sahrens */ 451*1d452cf5Sahrens if (oa->clone_parent->ds_phys->ds_num_children == 0) 452*1d452cf5Sahrens return (EINVAL); 453*1d452cf5Sahrens } 454*1d452cf5Sahrens return (0); 455*1d452cf5Sahrens } 456*1d452cf5Sahrens 457*1d452cf5Sahrens static void 458*1d452cf5Sahrens dmu_objset_create_sync(void *arg1, void *arg2, dmu_tx_t *tx) 459*1d452cf5Sahrens { 460*1d452cf5Sahrens dsl_dir_t *dd = arg1; 461*1d452cf5Sahrens struct oscarg *oa = arg2; 462*1d452cf5Sahrens dsl_dataset_t *ds; 463fa9e4066Sahrens blkptr_t bp; 464*1d452cf5Sahrens uint64_t dsobj; 465fa9e4066Sahrens 466fa9e4066Sahrens ASSERT(dmu_tx_is_syncing(tx)); 467fa9e4066Sahrens 468*1d452cf5Sahrens dsobj = dsl_dataset_create_sync(dd, oa->lastname, 469fa9e4066Sahrens oa->clone_parent, tx); 470fa9e4066Sahrens 471*1d452cf5Sahrens VERIFY(0 == dsl_dataset_open_obj(dd->dd_pool, dsobj, NULL, 472ea8dc4b6Seschrock DS_MODE_STANDARD | DS_MODE_READONLY, FTAG, &ds)); 473fa9e4066Sahrens dsl_dataset_get_blkptr(ds, &bp); 474fa9e4066Sahrens if (BP_IS_HOLE(&bp)) { 475fa9e4066Sahrens objset_impl_t *osi; 476fa9e4066Sahrens 477fa9e4066Sahrens /* This is an empty dmu_objset; not a clone. */ 478fa9e4066Sahrens osi = dmu_objset_create_impl(dsl_dataset_get_spa(ds), 479fa9e4066Sahrens ds, oa->type, tx); 480fa9e4066Sahrens 481fa9e4066Sahrens if (oa->userfunc) 482fa9e4066Sahrens oa->userfunc(&osi->os, oa->userarg, tx); 483fa9e4066Sahrens } 484fa9e4066Sahrens dsl_dataset_close(ds, DS_MODE_STANDARD | DS_MODE_READONLY, FTAG); 485fa9e4066Sahrens } 486fa9e4066Sahrens 487fa9e4066Sahrens int 488fa9e4066Sahrens dmu_objset_create(const char *name, dmu_objset_type_t type, 489fa9e4066Sahrens objset_t *clone_parent, 490fa9e4066Sahrens void (*func)(objset_t *os, void *arg, dmu_tx_t *tx), void *arg) 491fa9e4066Sahrens { 492*1d452cf5Sahrens dsl_dir_t *pdd; 493fa9e4066Sahrens const char *tail; 494fa9e4066Sahrens int err = 0; 495*1d452cf5Sahrens struct oscarg oa = { 0 }; 496fa9e4066Sahrens 497*1d452cf5Sahrens ASSERT(strchr(name, '@') == NULL); 498*1d452cf5Sahrens err = dsl_dir_open(name, FTAG, &pdd, &tail); 499ea8dc4b6Seschrock if (err) 500ea8dc4b6Seschrock return (err); 501fa9e4066Sahrens if (tail == NULL) { 502*1d452cf5Sahrens dsl_dir_close(pdd, FTAG); 503fa9e4066Sahrens return (EEXIST); 504fa9e4066Sahrens } 505fa9e4066Sahrens 506fa9e4066Sahrens dprintf("name=%s\n", name); 507fa9e4066Sahrens 508*1d452cf5Sahrens oa.userfunc = func; 509*1d452cf5Sahrens oa.userarg = arg; 510*1d452cf5Sahrens oa.lastname = tail; 511*1d452cf5Sahrens oa.type = type; 512*1d452cf5Sahrens if (clone_parent != NULL) { 513fa9e4066Sahrens /* 514*1d452cf5Sahrens * You can't clone to a different type. 515fa9e4066Sahrens */ 516*1d452cf5Sahrens if (clone_parent->os->os_phys->os_type != type) { 517*1d452cf5Sahrens dsl_dir_close(pdd, FTAG); 518*1d452cf5Sahrens return (EINVAL); 519fa9e4066Sahrens } 520*1d452cf5Sahrens oa.clone_parent = clone_parent->os->os_dsl_dataset; 521fa9e4066Sahrens } 522*1d452cf5Sahrens err = dsl_sync_task_do(pdd->dd_pool, dmu_objset_create_check, 523*1d452cf5Sahrens dmu_objset_create_sync, pdd, &oa, 5); 524*1d452cf5Sahrens dsl_dir_close(pdd, FTAG); 525fa9e4066Sahrens return (err); 526fa9e4066Sahrens } 527fa9e4066Sahrens 528fa9e4066Sahrens int 529fa9e4066Sahrens dmu_objset_destroy(const char *name) 530fa9e4066Sahrens { 531fa9e4066Sahrens objset_t *os; 532fa9e4066Sahrens int error; 533fa9e4066Sahrens 534fa9e4066Sahrens /* 535fa9e4066Sahrens * If it looks like we'll be able to destroy it, and there's 536fa9e4066Sahrens * an unplayed replay log sitting around, destroy the log. 537fa9e4066Sahrens * It would be nicer to do this in dsl_dataset_destroy_sync(), 538fa9e4066Sahrens * but the replay log objset is modified in open context. 539fa9e4066Sahrens */ 540fa9e4066Sahrens error = dmu_objset_open(name, DMU_OST_ANY, DS_MODE_EXCLUSIVE, &os); 541fa9e4066Sahrens if (error == 0) { 542d80c45e0Sbonwick zil_destroy(dmu_objset_zil(os), B_FALSE); 543fa9e4066Sahrens dmu_objset_close(os); 544fa9e4066Sahrens } 545fa9e4066Sahrens 546fa9e4066Sahrens return (dsl_dataset_destroy(name)); 547fa9e4066Sahrens } 548fa9e4066Sahrens 549fa9e4066Sahrens int 550fa9e4066Sahrens dmu_objset_rollback(const char *name) 551fa9e4066Sahrens { 552fa9e4066Sahrens int err; 553fa9e4066Sahrens objset_t *os; 554fa9e4066Sahrens 555*1d452cf5Sahrens err = dmu_objset_open(name, DMU_OST_ANY, 556*1d452cf5Sahrens DS_MODE_EXCLUSIVE | DS_MODE_INCONSISTENT, &os); 557fa9e4066Sahrens if (err == 0) { 558fa9e4066Sahrens err = zil_suspend(dmu_objset_zil(os)); 559fa9e4066Sahrens if (err == 0) 560fa9e4066Sahrens zil_resume(dmu_objset_zil(os)); 561fa9e4066Sahrens if (err == 0) { 562fa9e4066Sahrens /* XXX uncache everything? */ 563*1d452cf5Sahrens err = dsl_dataset_rollback(os->os->os_dsl_dataset); 564fa9e4066Sahrens } 565*1d452cf5Sahrens dmu_objset_close(os); 566fa9e4066Sahrens } 567fa9e4066Sahrens return (err); 568fa9e4066Sahrens } 569fa9e4066Sahrens 570*1d452cf5Sahrens struct snaparg { 571*1d452cf5Sahrens dsl_sync_task_group_t *dstg; 572*1d452cf5Sahrens char *snapname; 573*1d452cf5Sahrens char failed[MAXPATHLEN]; 574*1d452cf5Sahrens }; 575*1d452cf5Sahrens 576*1d452cf5Sahrens static int 577*1d452cf5Sahrens dmu_objset_snapshot_one(char *name, void *arg) 578*1d452cf5Sahrens { 579*1d452cf5Sahrens struct snaparg *sn = arg; 580*1d452cf5Sahrens objset_t *os; 581*1d452cf5Sahrens int err; 582*1d452cf5Sahrens 583*1d452cf5Sahrens (void) strcpy(sn->failed, name); 584*1d452cf5Sahrens 585*1d452cf5Sahrens err = dmu_objset_open(name, DMU_OST_ANY, DS_MODE_STANDARD, &os); 586*1d452cf5Sahrens if (err != 0) 587*1d452cf5Sahrens return (err); 588*1d452cf5Sahrens 589*1d452cf5Sahrens /* 590*1d452cf5Sahrens * NB: we need to wait for all in-flight changes to get to disk, 591*1d452cf5Sahrens * so that we snapshot those changes. zil_suspend does this as 592*1d452cf5Sahrens * a side effect. 593*1d452cf5Sahrens */ 594*1d452cf5Sahrens err = zil_suspend(dmu_objset_zil(os)); 595*1d452cf5Sahrens if (err == 0) { 596*1d452cf5Sahrens dsl_sync_task_create(sn->dstg, dsl_dataset_snapshot_check, 597*1d452cf5Sahrens dsl_dataset_snapshot_sync, os, sn->snapname, 3); 598*1d452cf5Sahrens } 599*1d452cf5Sahrens return (err); 600*1d452cf5Sahrens } 601*1d452cf5Sahrens 602*1d452cf5Sahrens int 603*1d452cf5Sahrens dmu_objset_snapshot(char *fsname, char *snapname, boolean_t recursive) 604*1d452cf5Sahrens { 605*1d452cf5Sahrens dsl_sync_task_t *dst; 606*1d452cf5Sahrens struct snaparg sn = { 0 }; 607*1d452cf5Sahrens char *cp; 608*1d452cf5Sahrens spa_t *spa; 609*1d452cf5Sahrens int err; 610*1d452cf5Sahrens 611*1d452cf5Sahrens (void) strcpy(sn.failed, fsname); 612*1d452cf5Sahrens 613*1d452cf5Sahrens cp = strchr(fsname, '/'); 614*1d452cf5Sahrens if (cp) { 615*1d452cf5Sahrens *cp = '\0'; 616*1d452cf5Sahrens err = spa_open(fsname, &spa, FTAG); 617*1d452cf5Sahrens *cp = '/'; 618*1d452cf5Sahrens } else { 619*1d452cf5Sahrens err = spa_open(fsname, &spa, FTAG); 620*1d452cf5Sahrens } 621*1d452cf5Sahrens if (err) 622*1d452cf5Sahrens return (err); 623*1d452cf5Sahrens 624*1d452cf5Sahrens sn.dstg = dsl_sync_task_group_create(spa_get_dsl(spa)); 625*1d452cf5Sahrens sn.snapname = snapname; 626*1d452cf5Sahrens 627*1d452cf5Sahrens if (recursive) 628*1d452cf5Sahrens err = dmu_objset_find(fsname, dmu_objset_snapshot_one, &sn, 0); 629*1d452cf5Sahrens else 630*1d452cf5Sahrens err = dmu_objset_snapshot_one(fsname, &sn); 631*1d452cf5Sahrens 632*1d452cf5Sahrens if (err) 633*1d452cf5Sahrens goto out; 634*1d452cf5Sahrens 635*1d452cf5Sahrens err = dsl_sync_task_group_wait(sn.dstg); 636*1d452cf5Sahrens 637*1d452cf5Sahrens for (dst = list_head(&sn.dstg->dstg_tasks); dst; 638*1d452cf5Sahrens dst = list_next(&sn.dstg->dstg_tasks, dst)) { 639*1d452cf5Sahrens objset_t *os = dst->dst_arg1; 640*1d452cf5Sahrens if (dst->dst_err) 641*1d452cf5Sahrens dmu_objset_name(os, sn.failed); 642*1d452cf5Sahrens zil_resume(dmu_objset_zil(os)); 643*1d452cf5Sahrens dmu_objset_close(os); 644*1d452cf5Sahrens } 645*1d452cf5Sahrens out: 646*1d452cf5Sahrens if (err) 647*1d452cf5Sahrens (void) strcpy(fsname, sn.failed); 648*1d452cf5Sahrens dsl_sync_task_group_destroy(sn.dstg); 649*1d452cf5Sahrens spa_close(spa, FTAG); 650*1d452cf5Sahrens return (err); 651*1d452cf5Sahrens } 652*1d452cf5Sahrens 653fa9e4066Sahrens static void 654fa9e4066Sahrens dmu_objset_sync_dnodes(objset_impl_t *os, list_t *list, dmu_tx_t *tx) 655fa9e4066Sahrens { 656fa9e4066Sahrens dnode_t *dn = list_head(list); 657fa9e4066Sahrens int level, err; 658fa9e4066Sahrens 659fa9e4066Sahrens for (level = 0; dn = list_head(list); level++) { 660fa9e4066Sahrens zio_t *zio; 661fa9e4066Sahrens zio = zio_root(os->os_spa, NULL, NULL, ZIO_FLAG_MUSTSUCCEED); 662fa9e4066Sahrens 663fa9e4066Sahrens ASSERT3U(level, <=, DN_MAX_LEVELS); 664fa9e4066Sahrens 665fa9e4066Sahrens while (dn) { 666fa9e4066Sahrens dnode_t *next = list_next(list, dn); 667fa9e4066Sahrens 668fa9e4066Sahrens list_remove(list, dn); 669fa9e4066Sahrens if (dnode_sync(dn, level, zio, tx) == 0) { 670fa9e4066Sahrens /* 671fa9e4066Sahrens * This dnode requires syncing at higher 672fa9e4066Sahrens * levels; put it back onto the list. 673fa9e4066Sahrens */ 674fa9e4066Sahrens if (next) 675fa9e4066Sahrens list_insert_before(list, next, dn); 676fa9e4066Sahrens else 677fa9e4066Sahrens list_insert_tail(list, dn); 678fa9e4066Sahrens } 679fa9e4066Sahrens dn = next; 680fa9e4066Sahrens } 681fa9e4066Sahrens err = zio_wait(zio); 682fa9e4066Sahrens ASSERT(err == 0); 683fa9e4066Sahrens } 684fa9e4066Sahrens } 685fa9e4066Sahrens 686fa9e4066Sahrens /* ARGSUSED */ 687fa9e4066Sahrens static void 688fa9e4066Sahrens killer(zio_t *zio, arc_buf_t *abuf, void *arg) 689fa9e4066Sahrens { 690fa9e4066Sahrens objset_impl_t *os = arg; 691fa9e4066Sahrens objset_phys_t *osphys = zio->io_data; 692fa9e4066Sahrens dnode_phys_t *dnp = &osphys->os_meta_dnode; 693fa9e4066Sahrens int i; 694fa9e4066Sahrens 695fa9e4066Sahrens ASSERT3U(zio->io_error, ==, 0); 696fa9e4066Sahrens 697fa9e4066Sahrens /* 698fa9e4066Sahrens * Update rootbp fill count. 699fa9e4066Sahrens */ 700fa9e4066Sahrens os->os_rootbp.blk_fill = 1; /* count the meta-dnode */ 701fa9e4066Sahrens for (i = 0; i < dnp->dn_nblkptr; i++) 702fa9e4066Sahrens os->os_rootbp.blk_fill += dnp->dn_blkptr[i].blk_fill; 703fa9e4066Sahrens 704fa9e4066Sahrens BP_SET_TYPE(zio->io_bp, DMU_OT_OBJSET); 705fa9e4066Sahrens BP_SET_LEVEL(zio->io_bp, 0); 706fa9e4066Sahrens 707fa9e4066Sahrens if (!DVA_EQUAL(BP_IDENTITY(zio->io_bp), 708fa9e4066Sahrens BP_IDENTITY(&zio->io_bp_orig))) { 709fa9e4066Sahrens dsl_dataset_block_kill(os->os_dsl_dataset, &zio->io_bp_orig, 710fa9e4066Sahrens os->os_synctx); 711fa9e4066Sahrens dsl_dataset_block_born(os->os_dsl_dataset, zio->io_bp, 712fa9e4066Sahrens os->os_synctx); 713fa9e4066Sahrens } 714fa9e4066Sahrens } 715fa9e4066Sahrens 716fa9e4066Sahrens 717fa9e4066Sahrens /* called from dsl */ 718fa9e4066Sahrens void 719fa9e4066Sahrens dmu_objset_sync(objset_impl_t *os, dmu_tx_t *tx) 720fa9e4066Sahrens { 721fa9e4066Sahrens extern taskq_t *dbuf_tq; 722fa9e4066Sahrens int txgoff; 723fa9e4066Sahrens list_t *dirty_list; 724fa9e4066Sahrens int err; 725ea8dc4b6Seschrock zbookmark_t zb; 726fa9e4066Sahrens arc_buf_t *abuf = 727fa9e4066Sahrens arc_buf_alloc(os->os_spa, sizeof (objset_phys_t), FTAG); 728fa9e4066Sahrens 729fa9e4066Sahrens ASSERT(dmu_tx_is_syncing(tx)); 730fa9e4066Sahrens ASSERT(os->os_synctx == NULL); 731fa9e4066Sahrens /* XXX the write_done callback should really give us the tx... */ 732fa9e4066Sahrens os->os_synctx = tx; 733fa9e4066Sahrens 734fa9e4066Sahrens dprintf_ds(os->os_dsl_dataset, "txg=%llu\n", tx->tx_txg); 735fa9e4066Sahrens 736fa9e4066Sahrens txgoff = tx->tx_txg & TXG_MASK; 737fa9e4066Sahrens 738fa9e4066Sahrens dmu_objset_sync_dnodes(os, &os->os_free_dnodes[txgoff], tx); 739fa9e4066Sahrens dmu_objset_sync_dnodes(os, &os->os_dirty_dnodes[txgoff], tx); 740fa9e4066Sahrens 741fa9e4066Sahrens /* 742fa9e4066Sahrens * Free intent log blocks up to this tx. 743fa9e4066Sahrens */ 744fa9e4066Sahrens zil_sync(os->os_zil, tx); 745fa9e4066Sahrens 746fa9e4066Sahrens /* 747fa9e4066Sahrens * Sync meta-dnode 748fa9e4066Sahrens */ 749fa9e4066Sahrens dirty_list = &os->os_dirty_dnodes[txgoff]; 750fa9e4066Sahrens ASSERT(list_head(dirty_list) == NULL); 751fa9e4066Sahrens list_insert_tail(dirty_list, os->os_meta_dnode); 752fa9e4066Sahrens dmu_objset_sync_dnodes(os, dirty_list, tx); 753fa9e4066Sahrens 754fa9e4066Sahrens /* 755fa9e4066Sahrens * Sync the root block. 756fa9e4066Sahrens */ 757fa9e4066Sahrens bcopy(os->os_phys, abuf->b_data, sizeof (objset_phys_t)); 758ea8dc4b6Seschrock zb.zb_objset = os->os_dsl_dataset ? os->os_dsl_dataset->ds_object : 0; 759ea8dc4b6Seschrock zb.zb_object = 0; 760ea8dc4b6Seschrock zb.zb_level = -1; 761ea8dc4b6Seschrock zb.zb_blkid = 0; 762fa9e4066Sahrens err = arc_write(NULL, os->os_spa, os->os_md_checksum, 76344cd46caSbillm os->os_md_compress, 76444cd46caSbillm dmu_get_replication_level(os->os_spa, &zb, DMU_OT_OBJSET), 76544cd46caSbillm tx->tx_txg, &os->os_rootbp, abuf, killer, os, 766ea8dc4b6Seschrock ZIO_PRIORITY_ASYNC_WRITE, ZIO_FLAG_MUSTSUCCEED, ARC_WAIT, &zb); 767fa9e4066Sahrens ASSERT(err == 0); 768ea8dc4b6Seschrock VERIFY(arc_buf_remove_ref(abuf, FTAG) == 1); 769fa9e4066Sahrens 770fa9e4066Sahrens dsl_dataset_set_blkptr(os->os_dsl_dataset, &os->os_rootbp, tx); 771fa9e4066Sahrens 772fa9e4066Sahrens ASSERT3P(os->os_synctx, ==, tx); 773fa9e4066Sahrens taskq_wait(dbuf_tq); 774fa9e4066Sahrens os->os_synctx = NULL; 775fa9e4066Sahrens } 776fa9e4066Sahrens 777fa9e4066Sahrens void 778fa9e4066Sahrens dmu_objset_stats(objset_t *os, dmu_objset_stats_t *dds) 779fa9e4066Sahrens { 780fa9e4066Sahrens if (os->os->os_dsl_dataset != NULL) { 781fa9e4066Sahrens dsl_dataset_stats(os->os->os_dsl_dataset, dds); 782fa9e4066Sahrens } else { 783fa9e4066Sahrens ASSERT(os->os->os_phys->os_type == DMU_OST_META); 784fa9e4066Sahrens bzero(dds, sizeof (*dds)); 785fa9e4066Sahrens } 786fa9e4066Sahrens dds->dds_type = os->os->os_phys->os_type; 787fa9e4066Sahrens } 788fa9e4066Sahrens 789fa9e4066Sahrens int 790fa9e4066Sahrens dmu_objset_is_snapshot(objset_t *os) 791fa9e4066Sahrens { 792fa9e4066Sahrens if (os->os->os_dsl_dataset != NULL) 793fa9e4066Sahrens return (dsl_dataset_is_snapshot(os->os->os_dsl_dataset)); 794fa9e4066Sahrens else 795fa9e4066Sahrens return (B_FALSE); 796fa9e4066Sahrens } 797fa9e4066Sahrens 798fa9e4066Sahrens int 799fa9e4066Sahrens dmu_snapshot_list_next(objset_t *os, int namelen, char *name, 80087e5029aSahrens uint64_t *idp, uint64_t *offp) 801fa9e4066Sahrens { 802fa9e4066Sahrens dsl_dataset_t *ds = os->os->os_dsl_dataset; 803fa9e4066Sahrens zap_cursor_t cursor; 804fa9e4066Sahrens zap_attribute_t attr; 805fa9e4066Sahrens 806fa9e4066Sahrens if (ds->ds_phys->ds_snapnames_zapobj == 0) 807fa9e4066Sahrens return (ENOENT); 808fa9e4066Sahrens 809fa9e4066Sahrens zap_cursor_init_serialized(&cursor, 810fa9e4066Sahrens ds->ds_dir->dd_pool->dp_meta_objset, 811fa9e4066Sahrens ds->ds_phys->ds_snapnames_zapobj, *offp); 812fa9e4066Sahrens 81387e5029aSahrens if (zap_cursor_retrieve(&cursor, &attr) != 0) { 81487e5029aSahrens zap_cursor_fini(&cursor); 81587e5029aSahrens return (ENOENT); 81687e5029aSahrens } 81787e5029aSahrens 81887e5029aSahrens if (strlen(attr.za_name) + 1 > namelen) { 81987e5029aSahrens zap_cursor_fini(&cursor); 82087e5029aSahrens return (ENAMETOOLONG); 82187e5029aSahrens } 82287e5029aSahrens 82387e5029aSahrens (void) strcpy(name, attr.za_name); 82487e5029aSahrens if (idp) 82587e5029aSahrens *idp = attr.za_first_integer; 82687e5029aSahrens zap_cursor_advance(&cursor); 82787e5029aSahrens *offp = zap_cursor_serialize(&cursor); 82887e5029aSahrens zap_cursor_fini(&cursor); 82987e5029aSahrens 83087e5029aSahrens return (0); 83187e5029aSahrens } 83287e5029aSahrens 83387e5029aSahrens int 83487e5029aSahrens dmu_dir_list_next(objset_t *os, int namelen, char *name, 83587e5029aSahrens uint64_t *idp, uint64_t *offp) 83687e5029aSahrens { 83787e5029aSahrens dsl_dir_t *dd = os->os->os_dsl_dataset->ds_dir; 83887e5029aSahrens zap_cursor_t cursor; 83987e5029aSahrens zap_attribute_t attr; 84087e5029aSahrens 84187e5029aSahrens /* there is no next dir on a snapshot! */ 84287e5029aSahrens if (os->os->os_dsl_dataset->ds_object != 84387e5029aSahrens dd->dd_phys->dd_head_dataset_obj) 844fa9e4066Sahrens return (ENOENT); 845fa9e4066Sahrens 84687e5029aSahrens zap_cursor_init_serialized(&cursor, 84787e5029aSahrens dd->dd_pool->dp_meta_objset, 84887e5029aSahrens dd->dd_phys->dd_child_dir_zapobj, *offp); 84987e5029aSahrens 85087e5029aSahrens if (zap_cursor_retrieve(&cursor, &attr) != 0) { 85187e5029aSahrens zap_cursor_fini(&cursor); 85287e5029aSahrens return (ENOENT); 85387e5029aSahrens } 85487e5029aSahrens 85587e5029aSahrens if (strlen(attr.za_name) + 1 > namelen) { 85687e5029aSahrens zap_cursor_fini(&cursor); 857fa9e4066Sahrens return (ENAMETOOLONG); 85887e5029aSahrens } 859fa9e4066Sahrens 860fa9e4066Sahrens (void) strcpy(name, attr.za_name); 86187e5029aSahrens if (idp) 86287e5029aSahrens *idp = attr.za_first_integer; 863fa9e4066Sahrens zap_cursor_advance(&cursor); 864fa9e4066Sahrens *offp = zap_cursor_serialize(&cursor); 86587e5029aSahrens zap_cursor_fini(&cursor); 866fa9e4066Sahrens 867fa9e4066Sahrens return (0); 868fa9e4066Sahrens } 869fa9e4066Sahrens 870fa9e4066Sahrens /* 871fa9e4066Sahrens * Find all objsets under name, and for each, call 'func(child_name, arg)'. 872fa9e4066Sahrens */ 873*1d452cf5Sahrens int 874*1d452cf5Sahrens dmu_objset_find(char *name, int func(char *, void *), void *arg, int flags) 875fa9e4066Sahrens { 876fa9e4066Sahrens dsl_dir_t *dd; 877fa9e4066Sahrens objset_t *os; 878fa9e4066Sahrens uint64_t snapobj; 879fa9e4066Sahrens zap_cursor_t zc; 880fa9e4066Sahrens zap_attribute_t attr; 881fa9e4066Sahrens char *child; 882ea8dc4b6Seschrock int do_self, err; 883fa9e4066Sahrens 884ea8dc4b6Seschrock err = dsl_dir_open(name, FTAG, &dd, NULL); 885ea8dc4b6Seschrock if (err) 886*1d452cf5Sahrens return (err); 887fa9e4066Sahrens 888*1d452cf5Sahrens /* NB: the $MOS dir doesn't have a head dataset */ 889fa9e4066Sahrens do_self = (dd->dd_phys->dd_head_dataset_obj != 0); 890fa9e4066Sahrens 891fa9e4066Sahrens /* 892fa9e4066Sahrens * Iterate over all children. 893fa9e4066Sahrens */ 894*1d452cf5Sahrens for (zap_cursor_init(&zc, dd->dd_pool->dp_meta_objset, 895*1d452cf5Sahrens dd->dd_phys->dd_child_dir_zapobj); 896*1d452cf5Sahrens zap_cursor_retrieve(&zc, &attr) == 0; 897*1d452cf5Sahrens (void) zap_cursor_advance(&zc)) { 898*1d452cf5Sahrens ASSERT(attr.za_integer_length == sizeof (uint64_t)); 899*1d452cf5Sahrens ASSERT(attr.za_num_integers == 1); 900fa9e4066Sahrens 901*1d452cf5Sahrens /* 902*1d452cf5Sahrens * No separating '/' because parent's name ends in /. 903*1d452cf5Sahrens */ 904*1d452cf5Sahrens child = kmem_alloc(MAXPATHLEN, KM_SLEEP); 905*1d452cf5Sahrens /* XXX could probably just use name here */ 906*1d452cf5Sahrens dsl_dir_name(dd, child); 907*1d452cf5Sahrens (void) strcat(child, "/"); 908*1d452cf5Sahrens (void) strcat(child, attr.za_name); 909*1d452cf5Sahrens err = dmu_objset_find(child, func, arg, flags); 910*1d452cf5Sahrens kmem_free(child, MAXPATHLEN); 911*1d452cf5Sahrens if (err) 912*1d452cf5Sahrens break; 913*1d452cf5Sahrens } 914*1d452cf5Sahrens zap_cursor_fini(&zc); 915*1d452cf5Sahrens 916*1d452cf5Sahrens if (err) { 917*1d452cf5Sahrens dsl_dir_close(dd, FTAG); 918*1d452cf5Sahrens return (err); 919fa9e4066Sahrens } 920fa9e4066Sahrens 921fa9e4066Sahrens /* 922fa9e4066Sahrens * Iterate over all snapshots. 923fa9e4066Sahrens */ 924fa9e4066Sahrens if ((flags & DS_FIND_SNAPSHOTS) && 925fa9e4066Sahrens dmu_objset_open(name, DMU_OST_ANY, 926fa9e4066Sahrens DS_MODE_STANDARD | DS_MODE_READONLY, &os) == 0) { 927fa9e4066Sahrens 928fa9e4066Sahrens snapobj = os->os->os_dsl_dataset->ds_phys->ds_snapnames_zapobj; 929fa9e4066Sahrens dmu_objset_close(os); 930fa9e4066Sahrens 931fa9e4066Sahrens for (zap_cursor_init(&zc, dd->dd_pool->dp_meta_objset, snapobj); 932fa9e4066Sahrens zap_cursor_retrieve(&zc, &attr) == 0; 933fa9e4066Sahrens (void) zap_cursor_advance(&zc)) { 934fa9e4066Sahrens ASSERT(attr.za_integer_length == sizeof (uint64_t)); 935fa9e4066Sahrens ASSERT(attr.za_num_integers == 1); 936fa9e4066Sahrens 937fa9e4066Sahrens child = kmem_alloc(MAXPATHLEN, KM_SLEEP); 938fa9e4066Sahrens /* XXX could probably just use name here */ 939fa9e4066Sahrens dsl_dir_name(dd, child); 940fa9e4066Sahrens (void) strcat(child, "@"); 941fa9e4066Sahrens (void) strcat(child, attr.za_name); 942*1d452cf5Sahrens err = func(child, arg); 943fa9e4066Sahrens kmem_free(child, MAXPATHLEN); 944*1d452cf5Sahrens if (err) 945*1d452cf5Sahrens break; 946fa9e4066Sahrens } 94787e5029aSahrens zap_cursor_fini(&zc); 948fa9e4066Sahrens } 949fa9e4066Sahrens 950fa9e4066Sahrens dsl_dir_close(dd, FTAG); 951fa9e4066Sahrens 952*1d452cf5Sahrens if (err) 953*1d452cf5Sahrens return (err); 954*1d452cf5Sahrens 955fa9e4066Sahrens /* 956fa9e4066Sahrens * Apply to self if appropriate. 957fa9e4066Sahrens */ 958fa9e4066Sahrens if (do_self) 959*1d452cf5Sahrens err = func(name, arg); 960*1d452cf5Sahrens return (err); 961fa9e4066Sahrens } 962