1fa9e4066Sahrens /* 2fa9e4066Sahrens * CDDL HEADER START 3fa9e4066Sahrens * 4fa9e4066Sahrens * The contents of this file are subject to the terms of the 5f65e61c0Sahrens * Common Development and Distribution License (the "License"). 6f65e61c0Sahrens * 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 /* 2206e0070dSMark Shellenbaum * Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved. 23bf16b11eSMatthew Ahrens * Copyright (c) 2012, 2014 by Delphix. All rights reserved. 24fa9e4066Sahrens */ 25fa9e4066Sahrens 26fa9e4066Sahrens #include <sys/zfs_context.h> 27fa9e4066Sahrens #include <sys/dbuf.h> 28fa9e4066Sahrens #include <sys/dnode.h> 29fa9e4066Sahrens #include <sys/dmu.h> 30fa9e4066Sahrens #include <sys/dmu_impl.h> 31fa9e4066Sahrens #include <sys/dmu_tx.h> 32fa9e4066Sahrens #include <sys/dmu_objset.h> 33fa9e4066Sahrens #include <sys/dsl_dir.h> 34fa9e4066Sahrens #include <sys/dsl_dataset.h> 35fa9e4066Sahrens #include <sys/spa.h> 36fa9e4066Sahrens #include <sys/zio.h> 37fa9e4066Sahrens #include <sys/dmu_zfetch.h> 38bf16b11eSMatthew Ahrens #include <sys/range_tree.h> 39fa9e4066Sahrens 40fa9e4066Sahrens static kmem_cache_t *dnode_cache; 41744947dcSTom Erickson /* 42744947dcSTom Erickson * Define DNODE_STATS to turn on statistic gathering. By default, it is only 43744947dcSTom Erickson * turned on when DEBUG is also defined. 44744947dcSTom Erickson */ 45744947dcSTom Erickson #ifdef DEBUG 46744947dcSTom Erickson #define DNODE_STATS 47744947dcSTom Erickson #endif /* DEBUG */ 48744947dcSTom Erickson 49744947dcSTom Erickson #ifdef DNODE_STATS 50744947dcSTom Erickson #define DNODE_STAT_ADD(stat) ((stat)++) 51744947dcSTom Erickson #else 52744947dcSTom Erickson #define DNODE_STAT_ADD(stat) /* nothing */ 53744947dcSTom Erickson #endif /* DNODE_STATS */ 54fa9e4066Sahrens 55fa9e4066Sahrens static dnode_phys_t dnode_phys_zero; 56fa9e4066Sahrens 57fa9e4066Sahrens int zfs_default_bs = SPA_MINBLOCKSHIFT; 58fa9e4066Sahrens int zfs_default_ibs = DN_MAX_INDBLKSHIFT; 59fa9e4066Sahrens 60744947dcSTom Erickson static kmem_cbrc_t dnode_move(void *, void *, size_t, void *); 61744947dcSTom Erickson 620f6d88adSAlex Reece static int 630f6d88adSAlex Reece dbuf_compare(const void *x1, const void *x2) 640f6d88adSAlex Reece { 650f6d88adSAlex Reece const dmu_buf_impl_t *d1 = x1; 660f6d88adSAlex Reece const dmu_buf_impl_t *d2 = x2; 670f6d88adSAlex Reece 680f6d88adSAlex Reece if (d1->db_level < d2->db_level) { 690f6d88adSAlex Reece return (-1); 7086bb58aeSAlex Reece } 7186bb58aeSAlex Reece if (d1->db_level > d2->db_level) { 720f6d88adSAlex Reece return (1); 730f6d88adSAlex Reece } 740f6d88adSAlex Reece 750f6d88adSAlex Reece if (d1->db_blkid < d2->db_blkid) { 760f6d88adSAlex Reece return (-1); 7786bb58aeSAlex Reece } 7886bb58aeSAlex Reece if (d1->db_blkid > d2->db_blkid) { 790f6d88adSAlex Reece return (1); 800f6d88adSAlex Reece } 810f6d88adSAlex Reece 82*a846f19dSAlex Reece if (d1->db_state == DB_SEARCH) { 83*a846f19dSAlex Reece ASSERT3S(d2->db_state, !=, DB_SEARCH); 840f6d88adSAlex Reece return (-1); 85*a846f19dSAlex Reece } else if (d2->db_state == DB_SEARCH) { 86*a846f19dSAlex Reece ASSERT3S(d1->db_state, !=, DB_SEARCH); 8786bb58aeSAlex Reece return (1); 8886bb58aeSAlex Reece } 8986bb58aeSAlex Reece 9086bb58aeSAlex Reece if ((uintptr_t)d1 < (uintptr_t)d2) { 9186bb58aeSAlex Reece return (-1); 9286bb58aeSAlex Reece } 9386bb58aeSAlex Reece if ((uintptr_t)d1 > (uintptr_t)d2) { 940f6d88adSAlex Reece return (1); 950f6d88adSAlex Reece } 9686bb58aeSAlex Reece return (0); 970f6d88adSAlex Reece } 980f6d88adSAlex Reece 99fa9e4066Sahrens /* ARGSUSED */ 100fa9e4066Sahrens static int 101fa9e4066Sahrens dnode_cons(void *arg, void *unused, int kmflag) 102fa9e4066Sahrens { 103fa9e4066Sahrens dnode_t *dn = arg; 104744947dcSTom Erickson int i; 105fa9e4066Sahrens 106fa9e4066Sahrens rw_init(&dn->dn_struct_rwlock, NULL, RW_DEFAULT, NULL); 107fa9e4066Sahrens mutex_init(&dn->dn_mtx, NULL, MUTEX_DEFAULT, NULL); 108fa9e4066Sahrens mutex_init(&dn->dn_dbufs_mtx, NULL, MUTEX_DEFAULT, NULL); 109b5e70f97SRicardo M. Correia cv_init(&dn->dn_notxholds, NULL, CV_DEFAULT, NULL); 110b5e70f97SRicardo M. Correia 1113b2aab18SMatthew Ahrens /* 1123b2aab18SMatthew Ahrens * Every dbuf has a reference, and dropping a tracked reference is 1133b2aab18SMatthew Ahrens * O(number of references), so don't track dn_holds. 1143b2aab18SMatthew Ahrens */ 1153b2aab18SMatthew Ahrens refcount_create_untracked(&dn->dn_holds); 116fa9e4066Sahrens refcount_create(&dn->dn_tx_holds); 117744947dcSTom Erickson list_link_init(&dn->dn_link); 118744947dcSTom Erickson 119744947dcSTom Erickson bzero(&dn->dn_next_nblkptr[0], sizeof (dn->dn_next_nblkptr)); 120744947dcSTom Erickson bzero(&dn->dn_next_nlevels[0], sizeof (dn->dn_next_nlevels)); 121744947dcSTom Erickson bzero(&dn->dn_next_indblkshift[0], sizeof (dn->dn_next_indblkshift)); 122744947dcSTom Erickson bzero(&dn->dn_next_bonustype[0], sizeof (dn->dn_next_bonustype)); 123744947dcSTom Erickson bzero(&dn->dn_rm_spillblk[0], sizeof (dn->dn_rm_spillblk)); 124744947dcSTom Erickson bzero(&dn->dn_next_bonuslen[0], sizeof (dn->dn_next_bonuslen)); 125744947dcSTom Erickson bzero(&dn->dn_next_blksz[0], sizeof (dn->dn_next_blksz)); 126fa9e4066Sahrens 127fa9e4066Sahrens for (i = 0; i < TXG_SIZE; i++) { 128744947dcSTom Erickson list_link_init(&dn->dn_dirty_link[i]); 129bf16b11eSMatthew Ahrens dn->dn_free_ranges[i] = NULL; 130c717a561Smaybee list_create(&dn->dn_dirty_records[i], 131c717a561Smaybee sizeof (dbuf_dirty_record_t), 132c717a561Smaybee offsetof(dbuf_dirty_record_t, dr_dirty_node)); 133fa9e4066Sahrens } 134fa9e4066Sahrens 135744947dcSTom Erickson dn->dn_allocated_txg = 0; 136744947dcSTom Erickson dn->dn_free_txg = 0; 137744947dcSTom Erickson dn->dn_assigned_txg = 0; 138744947dcSTom Erickson dn->dn_dirtyctx = 0; 139744947dcSTom Erickson dn->dn_dirtyctx_firstset = NULL; 140744947dcSTom Erickson dn->dn_bonus = NULL; 141744947dcSTom Erickson dn->dn_have_spill = B_FALSE; 142744947dcSTom Erickson dn->dn_zio = NULL; 143744947dcSTom Erickson dn->dn_oldused = 0; 144744947dcSTom Erickson dn->dn_oldflags = 0; 145744947dcSTom Erickson dn->dn_olduid = 0; 146744947dcSTom Erickson dn->dn_oldgid = 0; 147744947dcSTom Erickson dn->dn_newuid = 0; 148744947dcSTom Erickson dn->dn_newgid = 0; 149744947dcSTom Erickson dn->dn_id_flags = 0; 150744947dcSTom Erickson 151744947dcSTom Erickson dn->dn_dbufs_count = 0; 152713d6c20SMatthew Ahrens dn->dn_unlisted_l0_blkid = 0; 1530f6d88adSAlex Reece avl_create(&dn->dn_dbufs, dbuf_compare, sizeof (dmu_buf_impl_t), 154fa9e4066Sahrens offsetof(dmu_buf_impl_t, db_link)); 155fa9e4066Sahrens 156744947dcSTom Erickson dn->dn_moved = 0; 157fa9e4066Sahrens return (0); 158fa9e4066Sahrens } 159fa9e4066Sahrens 160fa9e4066Sahrens /* ARGSUSED */ 161fa9e4066Sahrens static void 162fa9e4066Sahrens dnode_dest(void *arg, void *unused) 163fa9e4066Sahrens { 164fa9e4066Sahrens int i; 165fa9e4066Sahrens dnode_t *dn = arg; 166fa9e4066Sahrens 167fa9e4066Sahrens rw_destroy(&dn->dn_struct_rwlock); 168fa9e4066Sahrens mutex_destroy(&dn->dn_mtx); 169fa9e4066Sahrens mutex_destroy(&dn->dn_dbufs_mtx); 170b5e70f97SRicardo M. Correia cv_destroy(&dn->dn_notxholds); 171fa9e4066Sahrens refcount_destroy(&dn->dn_holds); 172fa9e4066Sahrens refcount_destroy(&dn->dn_tx_holds); 173744947dcSTom Erickson ASSERT(!list_link_active(&dn->dn_link)); 174fa9e4066Sahrens 175fa9e4066Sahrens for (i = 0; i < TXG_SIZE; i++) { 176744947dcSTom Erickson ASSERT(!list_link_active(&dn->dn_dirty_link[i])); 177bf16b11eSMatthew Ahrens ASSERT3P(dn->dn_free_ranges[i], ==, NULL); 178c717a561Smaybee list_destroy(&dn->dn_dirty_records[i]); 179fb09f5aaSMadhav Suresh ASSERT0(dn->dn_next_nblkptr[i]); 180fb09f5aaSMadhav Suresh ASSERT0(dn->dn_next_nlevels[i]); 181fb09f5aaSMadhav Suresh ASSERT0(dn->dn_next_indblkshift[i]); 182fb09f5aaSMadhav Suresh ASSERT0(dn->dn_next_bonustype[i]); 183fb09f5aaSMadhav Suresh ASSERT0(dn->dn_rm_spillblk[i]); 184fb09f5aaSMadhav Suresh ASSERT0(dn->dn_next_bonuslen[i]); 185fb09f5aaSMadhav Suresh ASSERT0(dn->dn_next_blksz[i]); 186fa9e4066Sahrens } 187fa9e4066Sahrens 188fb09f5aaSMadhav Suresh ASSERT0(dn->dn_allocated_txg); 189fb09f5aaSMadhav Suresh ASSERT0(dn->dn_free_txg); 190fb09f5aaSMadhav Suresh ASSERT0(dn->dn_assigned_txg); 191fb09f5aaSMadhav Suresh ASSERT0(dn->dn_dirtyctx); 192744947dcSTom Erickson ASSERT3P(dn->dn_dirtyctx_firstset, ==, NULL); 193744947dcSTom Erickson ASSERT3P(dn->dn_bonus, ==, NULL); 194744947dcSTom Erickson ASSERT(!dn->dn_have_spill); 195744947dcSTom Erickson ASSERT3P(dn->dn_zio, ==, NULL); 196fb09f5aaSMadhav Suresh ASSERT0(dn->dn_oldused); 197fb09f5aaSMadhav Suresh ASSERT0(dn->dn_oldflags); 198fb09f5aaSMadhav Suresh ASSERT0(dn->dn_olduid); 199fb09f5aaSMadhav Suresh ASSERT0(dn->dn_oldgid); 200fb09f5aaSMadhav Suresh ASSERT0(dn->dn_newuid); 201fb09f5aaSMadhav Suresh ASSERT0(dn->dn_newgid); 202fb09f5aaSMadhav Suresh ASSERT0(dn->dn_id_flags); 203fb09f5aaSMadhav Suresh 204fb09f5aaSMadhav Suresh ASSERT0(dn->dn_dbufs_count); 205713d6c20SMatthew Ahrens ASSERT0(dn->dn_unlisted_l0_blkid); 2060f6d88adSAlex Reece avl_destroy(&dn->dn_dbufs); 207fa9e4066Sahrens } 208fa9e4066Sahrens 209fa9e4066Sahrens void 210fa9e4066Sahrens dnode_init(void) 211fa9e4066Sahrens { 212744947dcSTom Erickson ASSERT(dnode_cache == NULL); 213fa9e4066Sahrens dnode_cache = kmem_cache_create("dnode_t", 214fa9e4066Sahrens sizeof (dnode_t), 215fa9e4066Sahrens 0, dnode_cons, dnode_dest, NULL, NULL, NULL, 0); 216744947dcSTom Erickson kmem_cache_set_move(dnode_cache, dnode_move); 217fa9e4066Sahrens } 218fa9e4066Sahrens 219fa9e4066Sahrens void 220fa9e4066Sahrens dnode_fini(void) 221fa9e4066Sahrens { 222fa9e4066Sahrens kmem_cache_destroy(dnode_cache); 223744947dcSTom Erickson dnode_cache = NULL; 224fa9e4066Sahrens } 225fa9e4066Sahrens 226fa9e4066Sahrens 2279c9dc39aSek #ifdef ZFS_DEBUG 228fa9e4066Sahrens void 229fa9e4066Sahrens dnode_verify(dnode_t *dn) 230fa9e4066Sahrens { 231fa9e4066Sahrens int drop_struct_lock = FALSE; 232fa9e4066Sahrens 233fa9e4066Sahrens ASSERT(dn->dn_phys); 234fa9e4066Sahrens ASSERT(dn->dn_objset); 235744947dcSTom Erickson ASSERT(dn->dn_handle->dnh_dnode == dn); 236fa9e4066Sahrens 237ad135b5dSChristopher Siden ASSERT(DMU_OT_IS_VALID(dn->dn_phys->dn_type)); 238fa9e4066Sahrens 239fa9e4066Sahrens if (!(zfs_flags & ZFS_DEBUG_DNODE_VERIFY)) 240fa9e4066Sahrens return; 241fa9e4066Sahrens 242fa9e4066Sahrens if (!RW_WRITE_HELD(&dn->dn_struct_rwlock)) { 243fa9e4066Sahrens rw_enter(&dn->dn_struct_rwlock, RW_READER); 244fa9e4066Sahrens drop_struct_lock = TRUE; 245fa9e4066Sahrens } 246fa9e4066Sahrens if (dn->dn_phys->dn_type != DMU_OT_NONE || dn->dn_allocated_txg != 0) { 247fa9e4066Sahrens int i; 248fa9e4066Sahrens ASSERT3U(dn->dn_indblkshift, >=, 0); 249fa9e4066Sahrens ASSERT3U(dn->dn_indblkshift, <=, SPA_MAXBLOCKSHIFT); 250fa9e4066Sahrens if (dn->dn_datablkshift) { 251fa9e4066Sahrens ASSERT3U(dn->dn_datablkshift, >=, SPA_MINBLOCKSHIFT); 252fa9e4066Sahrens ASSERT3U(dn->dn_datablkshift, <=, SPA_MAXBLOCKSHIFT); 253fa9e4066Sahrens ASSERT3U(1<<dn->dn_datablkshift, ==, dn->dn_datablksz); 254fa9e4066Sahrens } 255fa9e4066Sahrens ASSERT3U(dn->dn_nlevels, <=, 30); 256ad135b5dSChristopher Siden ASSERT(DMU_OT_IS_VALID(dn->dn_type)); 257fa9e4066Sahrens ASSERT3U(dn->dn_nblkptr, >=, 1); 258fa9e4066Sahrens ASSERT3U(dn->dn_nblkptr, <=, DN_MAX_NBLKPTR); 259fa9e4066Sahrens ASSERT3U(dn->dn_bonuslen, <=, DN_MAX_BONUSLEN); 260fa9e4066Sahrens ASSERT3U(dn->dn_datablksz, ==, 261fa9e4066Sahrens dn->dn_datablkszsec << SPA_MINBLOCKSHIFT); 262fa9e4066Sahrens ASSERT3U(ISP2(dn->dn_datablksz), ==, dn->dn_datablkshift != 0); 263fa9e4066Sahrens ASSERT3U((dn->dn_nblkptr - 1) * sizeof (blkptr_t) + 264fa9e4066Sahrens dn->dn_bonuslen, <=, DN_MAX_BONUSLEN); 265fa9e4066Sahrens for (i = 0; i < TXG_SIZE; i++) { 266fa9e4066Sahrens ASSERT3U(dn->dn_next_nlevels[i], <=, dn->dn_nlevels); 267fa9e4066Sahrens } 268fa9e4066Sahrens } 269fa9e4066Sahrens if (dn->dn_phys->dn_type != DMU_OT_NONE) 270fa9e4066Sahrens ASSERT3U(dn->dn_phys->dn_nlevels, <=, dn->dn_nlevels); 27114843421SMatthew Ahrens ASSERT(DMU_OBJECT_IS_SPECIAL(dn->dn_object) || dn->dn_dbuf != NULL); 272fa9e4066Sahrens if (dn->dn_dbuf != NULL) { 273fa9e4066Sahrens ASSERT3P(dn->dn_phys, ==, 274fa9e4066Sahrens (dnode_phys_t *)dn->dn_dbuf->db.db_data + 275fa9e4066Sahrens (dn->dn_object % (dn->dn_dbuf->db.db_size >> DNODE_SHIFT))); 276fa9e4066Sahrens } 277fa9e4066Sahrens if (drop_struct_lock) 278fa9e4066Sahrens rw_exit(&dn->dn_struct_rwlock); 279fa9e4066Sahrens } 2809c9dc39aSek #endif 281fa9e4066Sahrens 282fa9e4066Sahrens void 283fa9e4066Sahrens dnode_byteswap(dnode_phys_t *dnp) 284fa9e4066Sahrens { 285fa9e4066Sahrens uint64_t *buf64 = (void*)&dnp->dn_blkptr; 286fa9e4066Sahrens int i; 287fa9e4066Sahrens 288fa9e4066Sahrens if (dnp->dn_type == DMU_OT_NONE) { 289fa9e4066Sahrens bzero(dnp, sizeof (dnode_phys_t)); 290fa9e4066Sahrens return; 291fa9e4066Sahrens } 292fa9e4066Sahrens 293fa9e4066Sahrens dnp->dn_datablkszsec = BSWAP_16(dnp->dn_datablkszsec); 294fa9e4066Sahrens dnp->dn_bonuslen = BSWAP_16(dnp->dn_bonuslen); 295fa9e4066Sahrens dnp->dn_maxblkid = BSWAP_64(dnp->dn_maxblkid); 29699653d4eSeschrock dnp->dn_used = BSWAP_64(dnp->dn_used); 297fa9e4066Sahrens 298fa9e4066Sahrens /* 299fa9e4066Sahrens * dn_nblkptr is only one byte, so it's OK to read it in either 300fa9e4066Sahrens * byte order. We can't read dn_bouslen. 301fa9e4066Sahrens */ 302fa9e4066Sahrens ASSERT(dnp->dn_indblkshift <= SPA_MAXBLOCKSHIFT); 303fa9e4066Sahrens ASSERT(dnp->dn_nblkptr <= DN_MAX_NBLKPTR); 304fa9e4066Sahrens for (i = 0; i < dnp->dn_nblkptr * sizeof (blkptr_t)/8; i++) 305fa9e4066Sahrens buf64[i] = BSWAP_64(buf64[i]); 306fa9e4066Sahrens 307fa9e4066Sahrens /* 308fa9e4066Sahrens * OK to check dn_bonuslen for zero, because it won't matter if 309fa9e4066Sahrens * we have the wrong byte order. This is necessary because the 310fa9e4066Sahrens * dnode dnode is smaller than a regular dnode. 311fa9e4066Sahrens */ 312fa9e4066Sahrens if (dnp->dn_bonuslen != 0) { 313fa9e4066Sahrens /* 314fa9e4066Sahrens * Note that the bonus length calculated here may be 315fa9e4066Sahrens * longer than the actual bonus buffer. This is because 316fa9e4066Sahrens * we always put the bonus buffer after the last block 317fa9e4066Sahrens * pointer (instead of packing it against the end of the 318fa9e4066Sahrens * dnode buffer). 319fa9e4066Sahrens */ 320fa9e4066Sahrens int off = (dnp->dn_nblkptr-1) * sizeof (blkptr_t); 321fa9e4066Sahrens size_t len = DN_MAX_BONUSLEN - off; 322ad135b5dSChristopher Siden ASSERT(DMU_OT_IS_VALID(dnp->dn_bonustype)); 323ad135b5dSChristopher Siden dmu_object_byteswap_t byteswap = 324ad135b5dSChristopher Siden DMU_OT_BYTESWAP(dnp->dn_bonustype); 325ad135b5dSChristopher Siden dmu_ot_byteswap[byteswap].ob_func(dnp->dn_bonus + off, len); 326fa9e4066Sahrens } 3270a586ceaSMark Shellenbaum 3280a586ceaSMark Shellenbaum /* Swap SPILL block if we have one */ 3290a586ceaSMark Shellenbaum if (dnp->dn_flags & DNODE_FLAG_SPILL_BLKPTR) 3300a586ceaSMark Shellenbaum byteswap_uint64_array(&dnp->dn_spill, sizeof (blkptr_t)); 3310a586ceaSMark Shellenbaum 332fa9e4066Sahrens } 333fa9e4066Sahrens 334fa9e4066Sahrens void 335fa9e4066Sahrens dnode_buf_byteswap(void *vbuf, size_t size) 336fa9e4066Sahrens { 337fa9e4066Sahrens dnode_phys_t *buf = vbuf; 338fa9e4066Sahrens int i; 339fa9e4066Sahrens 340fa9e4066Sahrens ASSERT3U(sizeof (dnode_phys_t), ==, (1<<DNODE_SHIFT)); 341fa9e4066Sahrens ASSERT((size & (sizeof (dnode_phys_t)-1)) == 0); 342fa9e4066Sahrens 343fa9e4066Sahrens size >>= DNODE_SHIFT; 344fa9e4066Sahrens for (i = 0; i < size; i++) { 345fa9e4066Sahrens dnode_byteswap(buf); 346fa9e4066Sahrens buf++; 347fa9e4066Sahrens } 348fa9e4066Sahrens } 349fa9e4066Sahrens 3501934e92fSmaybee void 3511934e92fSmaybee dnode_setbonuslen(dnode_t *dn, int newsize, dmu_tx_t *tx) 3521934e92fSmaybee { 3531934e92fSmaybee ASSERT3U(refcount_count(&dn->dn_holds), >=, 1); 3541934e92fSmaybee 3551934e92fSmaybee dnode_setdirty(dn, tx); 3561934e92fSmaybee rw_enter(&dn->dn_struct_rwlock, RW_WRITER); 3571934e92fSmaybee ASSERT3U(newsize, <=, DN_MAX_BONUSLEN - 3581934e92fSmaybee (dn->dn_nblkptr-1) * sizeof (blkptr_t)); 3591934e92fSmaybee dn->dn_bonuslen = newsize; 3601934e92fSmaybee if (newsize == 0) 3611934e92fSmaybee dn->dn_next_bonuslen[tx->tx_txg & TXG_MASK] = DN_ZERO_BONUSLEN; 3621934e92fSmaybee else 3631934e92fSmaybee dn->dn_next_bonuslen[tx->tx_txg & TXG_MASK] = dn->dn_bonuslen; 3641934e92fSmaybee rw_exit(&dn->dn_struct_rwlock); 3651934e92fSmaybee } 3661934e92fSmaybee 3670a586ceaSMark Shellenbaum void 3680a586ceaSMark Shellenbaum dnode_setbonus_type(dnode_t *dn, dmu_object_type_t newtype, dmu_tx_t *tx) 3690a586ceaSMark Shellenbaum { 3700a586ceaSMark Shellenbaum ASSERT3U(refcount_count(&dn->dn_holds), >=, 1); 3710a586ceaSMark Shellenbaum dnode_setdirty(dn, tx); 3720a586ceaSMark Shellenbaum rw_enter(&dn->dn_struct_rwlock, RW_WRITER); 3730a586ceaSMark Shellenbaum dn->dn_bonustype = newtype; 3740a586ceaSMark Shellenbaum dn->dn_next_bonustype[tx->tx_txg & TXG_MASK] = dn->dn_bonustype; 3750a586ceaSMark Shellenbaum rw_exit(&dn->dn_struct_rwlock); 3760a586ceaSMark Shellenbaum } 3770a586ceaSMark Shellenbaum 3780a586ceaSMark Shellenbaum void 3790a586ceaSMark Shellenbaum dnode_rm_spill(dnode_t *dn, dmu_tx_t *tx) 3800a586ceaSMark Shellenbaum { 3810a586ceaSMark Shellenbaum ASSERT3U(refcount_count(&dn->dn_holds), >=, 1); 38206e0070dSMark Shellenbaum ASSERT(RW_WRITE_HELD(&dn->dn_struct_rwlock)); 3830a586ceaSMark Shellenbaum dnode_setdirty(dn, tx); 3840a586ceaSMark Shellenbaum dn->dn_rm_spillblk[tx->tx_txg&TXG_MASK] = DN_KILL_SPILLBLK; 3850a586ceaSMark Shellenbaum dn->dn_have_spill = B_FALSE; 3860a586ceaSMark Shellenbaum } 3870a586ceaSMark Shellenbaum 388fa9e4066Sahrens static void 389fa9e4066Sahrens dnode_setdblksz(dnode_t *dn, int size) 390fa9e4066Sahrens { 391fb09f5aaSMadhav Suresh ASSERT0(P2PHASE(size, SPA_MINBLOCKSIZE)); 392fa9e4066Sahrens ASSERT3U(size, <=, SPA_MAXBLOCKSIZE); 393fa9e4066Sahrens ASSERT3U(size, >=, SPA_MINBLOCKSIZE); 394fa9e4066Sahrens ASSERT3U(size >> SPA_MINBLOCKSHIFT, <, 395fa9e4066Sahrens 1<<(sizeof (dn->dn_phys->dn_datablkszsec) * 8)); 396fa9e4066Sahrens dn->dn_datablksz = size; 397fa9e4066Sahrens dn->dn_datablkszsec = size >> SPA_MINBLOCKSHIFT; 398bf16b11eSMatthew Ahrens dn->dn_datablkshift = ISP2(size) ? highbit64(size - 1) : 0; 399fa9e4066Sahrens } 400fa9e4066Sahrens 401fa9e4066Sahrens static dnode_t * 402503ad85cSMatthew Ahrens dnode_create(objset_t *os, dnode_phys_t *dnp, dmu_buf_impl_t *db, 403744947dcSTom Erickson uint64_t object, dnode_handle_t *dnh) 404fa9e4066Sahrens { 405fa9e4066Sahrens dnode_t *dn = kmem_cache_alloc(dnode_cache, KM_SLEEP); 406fa9e4066Sahrens 407744947dcSTom Erickson ASSERT(!POINTER_IS_VALID(dn->dn_objset)); 408744947dcSTom Erickson dn->dn_moved = 0; 409744947dcSTom Erickson 410744947dcSTom Erickson /* 411744947dcSTom Erickson * Defer setting dn_objset until the dnode is ready to be a candidate 412744947dcSTom Erickson * for the dnode_move() callback. 413744947dcSTom Erickson */ 414fa9e4066Sahrens dn->dn_object = object; 415fa9e4066Sahrens dn->dn_dbuf = db; 416744947dcSTom Erickson dn->dn_handle = dnh; 417fa9e4066Sahrens dn->dn_phys = dnp; 418fa9e4066Sahrens 419744947dcSTom Erickson if (dnp->dn_datablkszsec) { 420fa9e4066Sahrens dnode_setdblksz(dn, dnp->dn_datablkszsec << SPA_MINBLOCKSHIFT); 421744947dcSTom Erickson } else { 422744947dcSTom Erickson dn->dn_datablksz = 0; 423744947dcSTom Erickson dn->dn_datablkszsec = 0; 424744947dcSTom Erickson dn->dn_datablkshift = 0; 425744947dcSTom Erickson } 426fa9e4066Sahrens dn->dn_indblkshift = dnp->dn_indblkshift; 427fa9e4066Sahrens dn->dn_nlevels = dnp->dn_nlevels; 428fa9e4066Sahrens dn->dn_type = dnp->dn_type; 429fa9e4066Sahrens dn->dn_nblkptr = dnp->dn_nblkptr; 430fa9e4066Sahrens dn->dn_checksum = dnp->dn_checksum; 431fa9e4066Sahrens dn->dn_compress = dnp->dn_compress; 432fa9e4066Sahrens dn->dn_bonustype = dnp->dn_bonustype; 433fa9e4066Sahrens dn->dn_bonuslen = dnp->dn_bonuslen; 434fa9e4066Sahrens dn->dn_maxblkid = dnp->dn_maxblkid; 4350a586ceaSMark Shellenbaum dn->dn_have_spill = ((dnp->dn_flags & DNODE_FLAG_SPILL_BLKPTR) != 0); 43606e0070dSMark Shellenbaum dn->dn_id_flags = 0; 437fa9e4066Sahrens 438fa9e4066Sahrens dmu_zfetch_init(&dn->dn_zfetch, dn); 439fa9e4066Sahrens 440ad135b5dSChristopher Siden ASSERT(DMU_OT_IS_VALID(dn->dn_phys->dn_type)); 441744947dcSTom Erickson 442fa9e4066Sahrens mutex_enter(&os->os_lock); 443fa9e4066Sahrens list_insert_head(&os->os_dnodes, dn); 444744947dcSTom Erickson membar_producer(); 445744947dcSTom Erickson /* 446744947dcSTom Erickson * Everything else must be valid before assigning dn_objset makes the 447744947dcSTom Erickson * dnode eligible for dnode_move(). 448744947dcSTom Erickson */ 449744947dcSTom Erickson dn->dn_objset = os; 450fa9e4066Sahrens mutex_exit(&os->os_lock); 451fa9e4066Sahrens 4525a98e54bSBrendan Gregg - Sun Microsystems arc_space_consume(sizeof (dnode_t), ARC_SPACE_OTHER); 453fa9e4066Sahrens return (dn); 454fa9e4066Sahrens } 455fa9e4066Sahrens 456744947dcSTom Erickson /* 457744947dcSTom Erickson * Caller must be holding the dnode handle, which is released upon return. 458744947dcSTom Erickson */ 459fa9e4066Sahrens static void 460fa9e4066Sahrens dnode_destroy(dnode_t *dn) 461fa9e4066Sahrens { 462503ad85cSMatthew Ahrens objset_t *os = dn->dn_objset; 463fa9e4066Sahrens 4640a586ceaSMark Shellenbaum ASSERT((dn->dn_id_flags & DN_ID_NEW_EXIST) == 0); 465a2eea2e1Sahrens 466fa9e4066Sahrens mutex_enter(&os->os_lock); 467744947dcSTom Erickson POINTER_INVALIDATE(&dn->dn_objset); 468fa9e4066Sahrens list_remove(&os->os_dnodes, dn); 469fa9e4066Sahrens mutex_exit(&os->os_lock); 470fa9e4066Sahrens 471744947dcSTom Erickson /* the dnode can no longer move, so we can release the handle */ 472744947dcSTom Erickson zrl_remove(&dn->dn_handle->dnh_zrlock); 473744947dcSTom Erickson 474744947dcSTom Erickson dn->dn_allocated_txg = 0; 475744947dcSTom Erickson dn->dn_free_txg = 0; 476744947dcSTom Erickson dn->dn_assigned_txg = 0; 477744947dcSTom Erickson 478744947dcSTom Erickson dn->dn_dirtyctx = 0; 479744947dcSTom Erickson if (dn->dn_dirtyctx_firstset != NULL) { 480fa9e4066Sahrens kmem_free(dn->dn_dirtyctx_firstset, 1); 481fa9e4066Sahrens dn->dn_dirtyctx_firstset = NULL; 482fa9e4066Sahrens } 483744947dcSTom Erickson if (dn->dn_bonus != NULL) { 484ea8dc4b6Seschrock mutex_enter(&dn->dn_bonus->db_mtx); 485ea8dc4b6Seschrock dbuf_evict(dn->dn_bonus); 486ea8dc4b6Seschrock dn->dn_bonus = NULL; 487ea8dc4b6Seschrock } 488744947dcSTom Erickson dn->dn_zio = NULL; 489744947dcSTom Erickson 490744947dcSTom Erickson dn->dn_have_spill = B_FALSE; 491744947dcSTom Erickson dn->dn_oldused = 0; 492744947dcSTom Erickson dn->dn_oldflags = 0; 493744947dcSTom Erickson dn->dn_olduid = 0; 494744947dcSTom Erickson dn->dn_oldgid = 0; 495744947dcSTom Erickson dn->dn_newuid = 0; 496744947dcSTom Erickson dn->dn_newgid = 0; 497744947dcSTom Erickson dn->dn_id_flags = 0; 498713d6c20SMatthew Ahrens dn->dn_unlisted_l0_blkid = 0; 499744947dcSTom Erickson 500744947dcSTom Erickson dmu_zfetch_rele(&dn->dn_zfetch); 501fa9e4066Sahrens kmem_cache_free(dnode_cache, dn); 5025a98e54bSBrendan Gregg - Sun Microsystems arc_space_return(sizeof (dnode_t), ARC_SPACE_OTHER); 503fa9e4066Sahrens } 504fa9e4066Sahrens 505fa9e4066Sahrens void 506fa9e4066Sahrens dnode_allocate(dnode_t *dn, dmu_object_type_t ot, int blocksize, int ibs, 507f676ed34Sahrens dmu_object_type_t bonustype, int bonuslen, dmu_tx_t *tx) 508fa9e4066Sahrens { 509fa9e4066Sahrens int i; 510fa9e4066Sahrens 511b5152584SMatthew Ahrens ASSERT3U(blocksize, <=, 512b5152584SMatthew Ahrens spa_maxblocksize(dmu_objset_spa(dn->dn_objset))); 513fa9e4066Sahrens if (blocksize == 0) 514fa9e4066Sahrens blocksize = 1 << zfs_default_bs; 5153b83abddSahrens else 5163b83abddSahrens blocksize = P2ROUNDUP(blocksize, SPA_MINBLOCKSIZE); 517fa9e4066Sahrens 518fa9e4066Sahrens if (ibs == 0) 519fa9e4066Sahrens ibs = zfs_default_ibs; 520fa9e4066Sahrens 521fa9e4066Sahrens ibs = MIN(MAX(ibs, DN_MIN_INDBLKSHIFT), DN_MAX_INDBLKSHIFT); 522fa9e4066Sahrens 523fa9e4066Sahrens dprintf("os=%p obj=%llu txg=%llu blocksize=%d ibs=%d\n", dn->dn_objset, 524fa9e4066Sahrens dn->dn_object, tx->tx_txg, blocksize, ibs); 525fa9e4066Sahrens 526fa9e4066Sahrens ASSERT(dn->dn_type == DMU_OT_NONE); 527fa9e4066Sahrens ASSERT(bcmp(dn->dn_phys, &dnode_phys_zero, sizeof (dnode_phys_t)) == 0); 528fa9e4066Sahrens ASSERT(dn->dn_phys->dn_type == DMU_OT_NONE); 529fa9e4066Sahrens ASSERT(ot != DMU_OT_NONE); 530ad135b5dSChristopher Siden ASSERT(DMU_OT_IS_VALID(ot)); 531fa9e4066Sahrens ASSERT((bonustype == DMU_OT_NONE && bonuslen == 0) || 5320a586ceaSMark Shellenbaum (bonustype == DMU_OT_SA && bonuslen == 0) || 533fa9e4066Sahrens (bonustype != DMU_OT_NONE && bonuslen != 0)); 534ad135b5dSChristopher Siden ASSERT(DMU_OT_IS_VALID(bonustype)); 535fa9e4066Sahrens ASSERT3U(bonuslen, <=, DN_MAX_BONUSLEN); 536fa9e4066Sahrens ASSERT(dn->dn_type == DMU_OT_NONE); 537fb09f5aaSMadhav Suresh ASSERT0(dn->dn_maxblkid); 538fb09f5aaSMadhav Suresh ASSERT0(dn->dn_allocated_txg); 539fb09f5aaSMadhav Suresh ASSERT0(dn->dn_assigned_txg); 540fa9e4066Sahrens ASSERT(refcount_is_zero(&dn->dn_tx_holds)); 541fa9e4066Sahrens ASSERT3U(refcount_count(&dn->dn_holds), <=, 1); 5420f6d88adSAlex Reece ASSERT(avl_is_empty(&dn->dn_dbufs)); 543fa9e4066Sahrens 544fa9e4066Sahrens for (i = 0; i < TXG_SIZE; i++) { 545fb09f5aaSMadhav Suresh ASSERT0(dn->dn_next_nblkptr[i]); 546fb09f5aaSMadhav Suresh ASSERT0(dn->dn_next_nlevels[i]); 547fb09f5aaSMadhav Suresh ASSERT0(dn->dn_next_indblkshift[i]); 548fb09f5aaSMadhav Suresh ASSERT0(dn->dn_next_bonuslen[i]); 549fb09f5aaSMadhav Suresh ASSERT0(dn->dn_next_bonustype[i]); 550fb09f5aaSMadhav Suresh ASSERT0(dn->dn_rm_spillblk[i]); 551fb09f5aaSMadhav Suresh ASSERT0(dn->dn_next_blksz[i]); 552c543ec06Sahrens ASSERT(!list_link_active(&dn->dn_dirty_link[i])); 553c717a561Smaybee ASSERT3P(list_head(&dn->dn_dirty_records[i]), ==, NULL); 554bf16b11eSMatthew Ahrens ASSERT3P(dn->dn_free_ranges[i], ==, NULL); 555fa9e4066Sahrens } 556fa9e4066Sahrens 557fa9e4066Sahrens dn->dn_type = ot; 558fa9e4066Sahrens dnode_setdblksz(dn, blocksize); 559fa9e4066Sahrens dn->dn_indblkshift = ibs; 560fa9e4066Sahrens dn->dn_nlevels = 1; 5610a586ceaSMark Shellenbaum if (bonustype == DMU_OT_SA) /* Maximize bonus space for SA */ 5620a586ceaSMark Shellenbaum dn->dn_nblkptr = 1; 5630a586ceaSMark Shellenbaum else 5640a586ceaSMark Shellenbaum dn->dn_nblkptr = 1 + 5650a586ceaSMark Shellenbaum ((DN_MAX_BONUSLEN - bonuslen) >> SPA_BLKPTRSHIFT); 566fa9e4066Sahrens dn->dn_bonustype = bonustype; 567fa9e4066Sahrens dn->dn_bonuslen = bonuslen; 568fa9e4066Sahrens dn->dn_checksum = ZIO_CHECKSUM_INHERIT; 569fa9e4066Sahrens dn->dn_compress = ZIO_COMPRESS_INHERIT; 570fa9e4066Sahrens dn->dn_dirtyctx = 0; 571fa9e4066Sahrens 572fa9e4066Sahrens dn->dn_free_txg = 0; 573fa9e4066Sahrens if (dn->dn_dirtyctx_firstset) { 574fa9e4066Sahrens kmem_free(dn->dn_dirtyctx_firstset, 1); 575fa9e4066Sahrens dn->dn_dirtyctx_firstset = NULL; 576fa9e4066Sahrens } 577fa9e4066Sahrens 578fa9e4066Sahrens dn->dn_allocated_txg = tx->tx_txg; 5790a586ceaSMark Shellenbaum dn->dn_id_flags = 0; 580f676ed34Sahrens 581fa9e4066Sahrens dnode_setdirty(dn, tx); 582f676ed34Sahrens dn->dn_next_indblkshift[tx->tx_txg & TXG_MASK] = ibs; 5831934e92fSmaybee dn->dn_next_bonuslen[tx->tx_txg & TXG_MASK] = dn->dn_bonuslen; 5840a586ceaSMark Shellenbaum dn->dn_next_bonustype[tx->tx_txg & TXG_MASK] = dn->dn_bonustype; 585f676ed34Sahrens dn->dn_next_blksz[tx->tx_txg & TXG_MASK] = dn->dn_datablksz; 586fa9e4066Sahrens } 587fa9e4066Sahrens 588fa9e4066Sahrens void 589fa9e4066Sahrens dnode_reallocate(dnode_t *dn, dmu_object_type_t ot, int blocksize, 590fa9e4066Sahrens dmu_object_type_t bonustype, int bonuslen, dmu_tx_t *tx) 591fa9e4066Sahrens { 5922bf405a2SMark Maybee int nblkptr; 593c543ec06Sahrens 594fa9e4066Sahrens ASSERT3U(blocksize, >=, SPA_MINBLOCKSIZE); 595b5152584SMatthew Ahrens ASSERT3U(blocksize, <=, 596b5152584SMatthew Ahrens spa_maxblocksize(dmu_objset_spa(dn->dn_objset))); 597fb09f5aaSMadhav Suresh ASSERT0(blocksize % SPA_MINBLOCKSIZE); 598ea8dc4b6Seschrock ASSERT(dn->dn_object != DMU_META_DNODE_OBJECT || dmu_tx_private_ok(tx)); 599fa9e4066Sahrens ASSERT(tx->tx_txg != 0); 600fa9e4066Sahrens ASSERT((bonustype == DMU_OT_NONE && bonuslen == 0) || 60106e0070dSMark Shellenbaum (bonustype != DMU_OT_NONE && bonuslen != 0) || 60206e0070dSMark Shellenbaum (bonustype == DMU_OT_SA && bonuslen == 0)); 603ad135b5dSChristopher Siden ASSERT(DMU_OT_IS_VALID(bonustype)); 604fa9e4066Sahrens ASSERT3U(bonuslen, <=, DN_MAX_BONUSLEN); 605c543ec06Sahrens 606ea8dc4b6Seschrock /* clean up any unreferenced dbufs */ 6071934e92fSmaybee dnode_evict_dbufs(dn); 608da03de99SMark Maybee 60928d97a71SMark Shellenbaum dn->dn_id_flags = 0; 61028d97a71SMark Shellenbaum 611fa9e4066Sahrens rw_enter(&dn->dn_struct_rwlock, RW_WRITER); 612fa9e4066Sahrens dnode_setdirty(dn, tx); 6132bf405a2SMark Maybee if (dn->dn_datablksz != blocksize) { 6142bf405a2SMark Maybee /* change blocksize */ 6152bf405a2SMark Maybee ASSERT(dn->dn_maxblkid == 0 && 6162bf405a2SMark Maybee (BP_IS_HOLE(&dn->dn_phys->dn_blkptr[0]) || 6172bf405a2SMark Maybee dnode_block_freed(dn, 0))); 6182bf405a2SMark Maybee dnode_setdblksz(dn, blocksize); 6192bf405a2SMark Maybee dn->dn_next_blksz[tx->tx_txg&TXG_MASK] = blocksize; 6202bf405a2SMark Maybee } 6212bf405a2SMark Maybee if (dn->dn_bonuslen != bonuslen) 6222bf405a2SMark Maybee dn->dn_next_bonuslen[tx->tx_txg&TXG_MASK] = bonuslen; 62306e0070dSMark Shellenbaum 62406e0070dSMark Shellenbaum if (bonustype == DMU_OT_SA) /* Maximize bonus space for SA */ 62506e0070dSMark Shellenbaum nblkptr = 1; 62606e0070dSMark Shellenbaum else 62706e0070dSMark Shellenbaum nblkptr = 1 + ((DN_MAX_BONUSLEN - bonuslen) >> SPA_BLKPTRSHIFT); 6280a586ceaSMark Shellenbaum if (dn->dn_bonustype != bonustype) 6290a586ceaSMark Shellenbaum dn->dn_next_bonustype[tx->tx_txg&TXG_MASK] = bonustype; 630da03de99SMark Maybee if (dn->dn_nblkptr != nblkptr) 631da03de99SMark Maybee dn->dn_next_nblkptr[tx->tx_txg&TXG_MASK] = nblkptr; 6320a586ceaSMark Shellenbaum if (dn->dn_phys->dn_flags & DNODE_FLAG_SPILL_BLKPTR) { 63306e0070dSMark Shellenbaum dbuf_rm_spill(dn, tx); 63406e0070dSMark Shellenbaum dnode_rm_spill(dn, tx); 6350a586ceaSMark Shellenbaum } 636fa9e4066Sahrens rw_exit(&dn->dn_struct_rwlock); 637fa9e4066Sahrens 638fa9e4066Sahrens /* change type */ 639fa9e4066Sahrens dn->dn_type = ot; 640fa9e4066Sahrens 641fa9e4066Sahrens /* change bonus size and type */ 642fa9e4066Sahrens mutex_enter(&dn->dn_mtx); 643fa9e4066Sahrens dn->dn_bonustype = bonustype; 644fa9e4066Sahrens dn->dn_bonuslen = bonuslen; 645da03de99SMark Maybee dn->dn_nblkptr = nblkptr; 646fa9e4066Sahrens dn->dn_checksum = ZIO_CHECKSUM_INHERIT; 647fa9e4066Sahrens dn->dn_compress = ZIO_COMPRESS_INHERIT; 648fa9e4066Sahrens ASSERT3U(dn->dn_nblkptr, <=, DN_MAX_NBLKPTR); 649fa9e4066Sahrens 650da03de99SMark Maybee /* fix up the bonus db_size */ 651da03de99SMark Maybee if (dn->dn_bonus) { 6521934e92fSmaybee dn->dn_bonus->db.db_size = 6531934e92fSmaybee DN_MAX_BONUSLEN - (dn->dn_nblkptr-1) * sizeof (blkptr_t); 6541934e92fSmaybee ASSERT(dn->dn_bonuslen <= dn->dn_bonus->db.db_size); 6551934e92fSmaybee } 656432f72fdSahrens 657fa9e4066Sahrens dn->dn_allocated_txg = tx->tx_txg; 658fa9e4066Sahrens mutex_exit(&dn->dn_mtx); 659fa9e4066Sahrens } 660fa9e4066Sahrens 661744947dcSTom Erickson #ifdef DNODE_STATS 662744947dcSTom Erickson static struct { 663744947dcSTom Erickson uint64_t dms_dnode_invalid; 664744947dcSTom Erickson uint64_t dms_dnode_recheck1; 665744947dcSTom Erickson uint64_t dms_dnode_recheck2; 666744947dcSTom Erickson uint64_t dms_dnode_special; 667744947dcSTom Erickson uint64_t dms_dnode_handle; 668744947dcSTom Erickson uint64_t dms_dnode_rwlock; 669744947dcSTom Erickson uint64_t dms_dnode_active; 670744947dcSTom Erickson } dnode_move_stats; 671744947dcSTom Erickson #endif /* DNODE_STATS */ 672744947dcSTom Erickson 673744947dcSTom Erickson static void 674744947dcSTom Erickson dnode_move_impl(dnode_t *odn, dnode_t *ndn) 675744947dcSTom Erickson { 676744947dcSTom Erickson int i; 677744947dcSTom Erickson 678744947dcSTom Erickson ASSERT(!RW_LOCK_HELD(&odn->dn_struct_rwlock)); 679744947dcSTom Erickson ASSERT(MUTEX_NOT_HELD(&odn->dn_mtx)); 680744947dcSTom Erickson ASSERT(MUTEX_NOT_HELD(&odn->dn_dbufs_mtx)); 681744947dcSTom Erickson ASSERT(!RW_LOCK_HELD(&odn->dn_zfetch.zf_rwlock)); 682744947dcSTom Erickson 683744947dcSTom Erickson /* Copy fields. */ 684744947dcSTom Erickson ndn->dn_objset = odn->dn_objset; 685744947dcSTom Erickson ndn->dn_object = odn->dn_object; 686744947dcSTom Erickson ndn->dn_dbuf = odn->dn_dbuf; 687744947dcSTom Erickson ndn->dn_handle = odn->dn_handle; 688744947dcSTom Erickson ndn->dn_phys = odn->dn_phys; 689744947dcSTom Erickson ndn->dn_type = odn->dn_type; 690744947dcSTom Erickson ndn->dn_bonuslen = odn->dn_bonuslen; 691744947dcSTom Erickson ndn->dn_bonustype = odn->dn_bonustype; 692744947dcSTom Erickson ndn->dn_nblkptr = odn->dn_nblkptr; 693744947dcSTom Erickson ndn->dn_checksum = odn->dn_checksum; 694744947dcSTom Erickson ndn->dn_compress = odn->dn_compress; 695744947dcSTom Erickson ndn->dn_nlevels = odn->dn_nlevels; 696744947dcSTom Erickson ndn->dn_indblkshift = odn->dn_indblkshift; 697744947dcSTom Erickson ndn->dn_datablkshift = odn->dn_datablkshift; 698744947dcSTom Erickson ndn->dn_datablkszsec = odn->dn_datablkszsec; 699744947dcSTom Erickson ndn->dn_datablksz = odn->dn_datablksz; 700744947dcSTom Erickson ndn->dn_maxblkid = odn->dn_maxblkid; 701744947dcSTom Erickson bcopy(&odn->dn_next_nblkptr[0], &ndn->dn_next_nblkptr[0], 702744947dcSTom Erickson sizeof (odn->dn_next_nblkptr)); 703744947dcSTom Erickson bcopy(&odn->dn_next_nlevels[0], &ndn->dn_next_nlevels[0], 704744947dcSTom Erickson sizeof (odn->dn_next_nlevels)); 705744947dcSTom Erickson bcopy(&odn->dn_next_indblkshift[0], &ndn->dn_next_indblkshift[0], 706744947dcSTom Erickson sizeof (odn->dn_next_indblkshift)); 707744947dcSTom Erickson bcopy(&odn->dn_next_bonustype[0], &ndn->dn_next_bonustype[0], 708744947dcSTom Erickson sizeof (odn->dn_next_bonustype)); 709744947dcSTom Erickson bcopy(&odn->dn_rm_spillblk[0], &ndn->dn_rm_spillblk[0], 710744947dcSTom Erickson sizeof (odn->dn_rm_spillblk)); 711744947dcSTom Erickson bcopy(&odn->dn_next_bonuslen[0], &ndn->dn_next_bonuslen[0], 712744947dcSTom Erickson sizeof (odn->dn_next_bonuslen)); 713744947dcSTom Erickson bcopy(&odn->dn_next_blksz[0], &ndn->dn_next_blksz[0], 714744947dcSTom Erickson sizeof (odn->dn_next_blksz)); 715744947dcSTom Erickson for (i = 0; i < TXG_SIZE; i++) { 716744947dcSTom Erickson list_move_tail(&ndn->dn_dirty_records[i], 717744947dcSTom Erickson &odn->dn_dirty_records[i]); 718744947dcSTom Erickson } 719bf16b11eSMatthew Ahrens bcopy(&odn->dn_free_ranges[0], &ndn->dn_free_ranges[0], 720bf16b11eSMatthew Ahrens sizeof (odn->dn_free_ranges)); 721744947dcSTom Erickson ndn->dn_allocated_txg = odn->dn_allocated_txg; 722744947dcSTom Erickson ndn->dn_free_txg = odn->dn_free_txg; 723744947dcSTom Erickson ndn->dn_assigned_txg = odn->dn_assigned_txg; 724744947dcSTom Erickson ndn->dn_dirtyctx = odn->dn_dirtyctx; 725744947dcSTom Erickson ndn->dn_dirtyctx_firstset = odn->dn_dirtyctx_firstset; 726744947dcSTom Erickson ASSERT(refcount_count(&odn->dn_tx_holds) == 0); 727744947dcSTom Erickson refcount_transfer(&ndn->dn_holds, &odn->dn_holds); 7280f6d88adSAlex Reece ASSERT(avl_is_empty(&ndn->dn_dbufs)); 7290f6d88adSAlex Reece avl_swap(&ndn->dn_dbufs, &odn->dn_dbufs); 730744947dcSTom Erickson ndn->dn_dbufs_count = odn->dn_dbufs_count; 731713d6c20SMatthew Ahrens ndn->dn_unlisted_l0_blkid = odn->dn_unlisted_l0_blkid; 732744947dcSTom Erickson ndn->dn_bonus = odn->dn_bonus; 733744947dcSTom Erickson ndn->dn_have_spill = odn->dn_have_spill; 734744947dcSTom Erickson ndn->dn_zio = odn->dn_zio; 735744947dcSTom Erickson ndn->dn_oldused = odn->dn_oldused; 736744947dcSTom Erickson ndn->dn_oldflags = odn->dn_oldflags; 737744947dcSTom Erickson ndn->dn_olduid = odn->dn_olduid; 738744947dcSTom Erickson ndn->dn_oldgid = odn->dn_oldgid; 739744947dcSTom Erickson ndn->dn_newuid = odn->dn_newuid; 740744947dcSTom Erickson ndn->dn_newgid = odn->dn_newgid; 741744947dcSTom Erickson ndn->dn_id_flags = odn->dn_id_flags; 742744947dcSTom Erickson dmu_zfetch_init(&ndn->dn_zfetch, NULL); 743744947dcSTom Erickson list_move_tail(&ndn->dn_zfetch.zf_stream, &odn->dn_zfetch.zf_stream); 744744947dcSTom Erickson ndn->dn_zfetch.zf_dnode = odn->dn_zfetch.zf_dnode; 745744947dcSTom Erickson ndn->dn_zfetch.zf_stream_cnt = odn->dn_zfetch.zf_stream_cnt; 746744947dcSTom Erickson ndn->dn_zfetch.zf_alloc_fail = odn->dn_zfetch.zf_alloc_fail; 747744947dcSTom Erickson 748744947dcSTom Erickson /* 749744947dcSTom Erickson * Update back pointers. Updating the handle fixes the back pointer of 750744947dcSTom Erickson * every descendant dbuf as well as the bonus dbuf. 751744947dcSTom Erickson */ 752744947dcSTom Erickson ASSERT(ndn->dn_handle->dnh_dnode == odn); 753744947dcSTom Erickson ndn->dn_handle->dnh_dnode = ndn; 754744947dcSTom Erickson if (ndn->dn_zfetch.zf_dnode == odn) { 755744947dcSTom Erickson ndn->dn_zfetch.zf_dnode = ndn; 756744947dcSTom Erickson } 757744947dcSTom Erickson 758744947dcSTom Erickson /* 759744947dcSTom Erickson * Invalidate the original dnode by clearing all of its back pointers. 760744947dcSTom Erickson */ 761744947dcSTom Erickson odn->dn_dbuf = NULL; 762744947dcSTom Erickson odn->dn_handle = NULL; 7630f6d88adSAlex Reece avl_create(&odn->dn_dbufs, dbuf_compare, sizeof (dmu_buf_impl_t), 764744947dcSTom Erickson offsetof(dmu_buf_impl_t, db_link)); 765744947dcSTom Erickson odn->dn_dbufs_count = 0; 766713d6c20SMatthew Ahrens odn->dn_unlisted_l0_blkid = 0; 767744947dcSTom Erickson odn->dn_bonus = NULL; 768744947dcSTom Erickson odn->dn_zfetch.zf_dnode = NULL; 769744947dcSTom Erickson 770744947dcSTom Erickson /* 771744947dcSTom Erickson * Set the low bit of the objset pointer to ensure that dnode_move() 772744947dcSTom Erickson * recognizes the dnode as invalid in any subsequent callback. 773744947dcSTom Erickson */ 774744947dcSTom Erickson POINTER_INVALIDATE(&odn->dn_objset); 775744947dcSTom Erickson 776744947dcSTom Erickson /* 777744947dcSTom Erickson * Satisfy the destructor. 778744947dcSTom Erickson */ 779744947dcSTom Erickson for (i = 0; i < TXG_SIZE; i++) { 780744947dcSTom Erickson list_create(&odn->dn_dirty_records[i], 781744947dcSTom Erickson sizeof (dbuf_dirty_record_t), 782744947dcSTom Erickson offsetof(dbuf_dirty_record_t, dr_dirty_node)); 783bf16b11eSMatthew Ahrens odn->dn_free_ranges[i] = NULL; 784744947dcSTom Erickson odn->dn_next_nlevels[i] = 0; 785744947dcSTom Erickson odn->dn_next_indblkshift[i] = 0; 786744947dcSTom Erickson odn->dn_next_bonustype[i] = 0; 787744947dcSTom Erickson odn->dn_rm_spillblk[i] = 0; 788744947dcSTom Erickson odn->dn_next_bonuslen[i] = 0; 789744947dcSTom Erickson odn->dn_next_blksz[i] = 0; 790744947dcSTom Erickson } 791744947dcSTom Erickson odn->dn_allocated_txg = 0; 792744947dcSTom Erickson odn->dn_free_txg = 0; 793744947dcSTom Erickson odn->dn_assigned_txg = 0; 794744947dcSTom Erickson odn->dn_dirtyctx = 0; 795744947dcSTom Erickson odn->dn_dirtyctx_firstset = NULL; 796744947dcSTom Erickson odn->dn_have_spill = B_FALSE; 797744947dcSTom Erickson odn->dn_zio = NULL; 798744947dcSTom Erickson odn->dn_oldused = 0; 799744947dcSTom Erickson odn->dn_oldflags = 0; 800744947dcSTom Erickson odn->dn_olduid = 0; 801744947dcSTom Erickson odn->dn_oldgid = 0; 802744947dcSTom Erickson odn->dn_newuid = 0; 803744947dcSTom Erickson odn->dn_newgid = 0; 804744947dcSTom Erickson odn->dn_id_flags = 0; 805744947dcSTom Erickson 806744947dcSTom Erickson /* 807744947dcSTom Erickson * Mark the dnode. 808744947dcSTom Erickson */ 809744947dcSTom Erickson ndn->dn_moved = 1; 810744947dcSTom Erickson odn->dn_moved = (uint8_t)-1; 811744947dcSTom Erickson } 812744947dcSTom Erickson 813744947dcSTom Erickson #ifdef _KERNEL 814744947dcSTom Erickson /*ARGSUSED*/ 815744947dcSTom Erickson static kmem_cbrc_t 816744947dcSTom Erickson dnode_move(void *buf, void *newbuf, size_t size, void *arg) 817744947dcSTom Erickson { 818744947dcSTom Erickson dnode_t *odn = buf, *ndn = newbuf; 819744947dcSTom Erickson objset_t *os; 820744947dcSTom Erickson int64_t refcount; 821744947dcSTom Erickson uint32_t dbufs; 822744947dcSTom Erickson 823744947dcSTom Erickson /* 824744947dcSTom Erickson * The dnode is on the objset's list of known dnodes if the objset 825744947dcSTom Erickson * pointer is valid. We set the low bit of the objset pointer when 826744947dcSTom Erickson * freeing the dnode to invalidate it, and the memory patterns written 827744947dcSTom Erickson * by kmem (baddcafe and deadbeef) set at least one of the two low bits. 828744947dcSTom Erickson * A newly created dnode sets the objset pointer last of all to indicate 829744947dcSTom Erickson * that the dnode is known and in a valid state to be moved by this 830744947dcSTom Erickson * function. 831744947dcSTom Erickson */ 832744947dcSTom Erickson os = odn->dn_objset; 833744947dcSTom Erickson if (!POINTER_IS_VALID(os)) { 834744947dcSTom Erickson DNODE_STAT_ADD(dnode_move_stats.dms_dnode_invalid); 835744947dcSTom Erickson return (KMEM_CBRC_DONT_KNOW); 836744947dcSTom Erickson } 837744947dcSTom Erickson 838744947dcSTom Erickson /* 839744947dcSTom Erickson * Ensure that the objset does not go away during the move. 840744947dcSTom Erickson */ 841744947dcSTom Erickson rw_enter(&os_lock, RW_WRITER); 842744947dcSTom Erickson if (os != odn->dn_objset) { 843744947dcSTom Erickson rw_exit(&os_lock); 844744947dcSTom Erickson DNODE_STAT_ADD(dnode_move_stats.dms_dnode_recheck1); 845744947dcSTom Erickson return (KMEM_CBRC_DONT_KNOW); 846744947dcSTom Erickson } 847744947dcSTom Erickson 848744947dcSTom Erickson /* 849744947dcSTom Erickson * If the dnode is still valid, then so is the objset. We know that no 850744947dcSTom Erickson * valid objset can be freed while we hold os_lock, so we can safely 851744947dcSTom Erickson * ensure that the objset remains in use. 852744947dcSTom Erickson */ 853744947dcSTom Erickson mutex_enter(&os->os_lock); 854744947dcSTom Erickson 855744947dcSTom Erickson /* 856744947dcSTom Erickson * Recheck the objset pointer in case the dnode was removed just before 857744947dcSTom Erickson * acquiring the lock. 858744947dcSTom Erickson */ 859744947dcSTom Erickson if (os != odn->dn_objset) { 860744947dcSTom Erickson mutex_exit(&os->os_lock); 861744947dcSTom Erickson rw_exit(&os_lock); 862744947dcSTom Erickson DNODE_STAT_ADD(dnode_move_stats.dms_dnode_recheck2); 863744947dcSTom Erickson return (KMEM_CBRC_DONT_KNOW); 864744947dcSTom Erickson } 865744947dcSTom Erickson 866744947dcSTom Erickson /* 867744947dcSTom Erickson * At this point we know that as long as we hold os->os_lock, the dnode 868744947dcSTom Erickson * cannot be freed and fields within the dnode can be safely accessed. 869744947dcSTom Erickson * The objset listing this dnode cannot go away as long as this dnode is 870744947dcSTom Erickson * on its list. 871744947dcSTom Erickson */ 872744947dcSTom Erickson rw_exit(&os_lock); 873744947dcSTom Erickson if (DMU_OBJECT_IS_SPECIAL(odn->dn_object)) { 874744947dcSTom Erickson mutex_exit(&os->os_lock); 875744947dcSTom Erickson DNODE_STAT_ADD(dnode_move_stats.dms_dnode_special); 876744947dcSTom Erickson return (KMEM_CBRC_NO); 877744947dcSTom Erickson } 878744947dcSTom Erickson ASSERT(odn->dn_dbuf != NULL); /* only "special" dnodes have no parent */ 879744947dcSTom Erickson 880744947dcSTom Erickson /* 881744947dcSTom Erickson * Lock the dnode handle to prevent the dnode from obtaining any new 882744947dcSTom Erickson * holds. This also prevents the descendant dbufs and the bonus dbuf 883744947dcSTom Erickson * from accessing the dnode, so that we can discount their holds. The 884744947dcSTom Erickson * handle is safe to access because we know that while the dnode cannot 885744947dcSTom Erickson * go away, neither can its handle. Once we hold dnh_zrlock, we can 886744947dcSTom Erickson * safely move any dnode referenced only by dbufs. 887744947dcSTom Erickson */ 888744947dcSTom Erickson if (!zrl_tryenter(&odn->dn_handle->dnh_zrlock)) { 889744947dcSTom Erickson mutex_exit(&os->os_lock); 890744947dcSTom Erickson DNODE_STAT_ADD(dnode_move_stats.dms_dnode_handle); 891744947dcSTom Erickson return (KMEM_CBRC_LATER); 892744947dcSTom Erickson } 893744947dcSTom Erickson 894744947dcSTom Erickson /* 895744947dcSTom Erickson * Ensure a consistent view of the dnode's holds and the dnode's dbufs. 896744947dcSTom Erickson * We need to guarantee that there is a hold for every dbuf in order to 897744947dcSTom Erickson * determine whether the dnode is actively referenced. Falsely matching 898744947dcSTom Erickson * a dbuf to an active hold would lead to an unsafe move. It's possible 899744947dcSTom Erickson * that a thread already having an active dnode hold is about to add a 900744947dcSTom Erickson * dbuf, and we can't compare hold and dbuf counts while the add is in 901744947dcSTom Erickson * progress. 902744947dcSTom Erickson */ 903744947dcSTom Erickson if (!rw_tryenter(&odn->dn_struct_rwlock, RW_WRITER)) { 904744947dcSTom Erickson zrl_exit(&odn->dn_handle->dnh_zrlock); 905744947dcSTom Erickson mutex_exit(&os->os_lock); 906744947dcSTom Erickson DNODE_STAT_ADD(dnode_move_stats.dms_dnode_rwlock); 907744947dcSTom Erickson return (KMEM_CBRC_LATER); 908744947dcSTom Erickson } 909744947dcSTom Erickson 910744947dcSTom Erickson /* 911744947dcSTom Erickson * A dbuf may be removed (evicted) without an active dnode hold. In that 912744947dcSTom Erickson * case, the dbuf count is decremented under the handle lock before the 913744947dcSTom Erickson * dbuf's hold is released. This order ensures that if we count the hold 914744947dcSTom Erickson * after the dbuf is removed but before its hold is released, we will 915744947dcSTom Erickson * treat the unmatched hold as active and exit safely. If we count the 916744947dcSTom Erickson * hold before the dbuf is removed, the hold is discounted, and the 917744947dcSTom Erickson * removal is blocked until the move completes. 918744947dcSTom Erickson */ 919744947dcSTom Erickson refcount = refcount_count(&odn->dn_holds); 920744947dcSTom Erickson ASSERT(refcount >= 0); 921744947dcSTom Erickson dbufs = odn->dn_dbufs_count; 922744947dcSTom Erickson 923744947dcSTom Erickson /* We can't have more dbufs than dnode holds. */ 924744947dcSTom Erickson ASSERT3U(dbufs, <=, refcount); 925744947dcSTom Erickson DTRACE_PROBE3(dnode__move, dnode_t *, odn, int64_t, refcount, 926744947dcSTom Erickson uint32_t, dbufs); 927744947dcSTom Erickson 928744947dcSTom Erickson if (refcount > dbufs) { 929744947dcSTom Erickson rw_exit(&odn->dn_struct_rwlock); 930744947dcSTom Erickson zrl_exit(&odn->dn_handle->dnh_zrlock); 931744947dcSTom Erickson mutex_exit(&os->os_lock); 932744947dcSTom Erickson DNODE_STAT_ADD(dnode_move_stats.dms_dnode_active); 933744947dcSTom Erickson return (KMEM_CBRC_LATER); 934744947dcSTom Erickson } 935744947dcSTom Erickson 936744947dcSTom Erickson rw_exit(&odn->dn_struct_rwlock); 937744947dcSTom Erickson 938744947dcSTom Erickson /* 939744947dcSTom Erickson * At this point we know that anyone with a hold on the dnode is not 940744947dcSTom Erickson * actively referencing it. The dnode is known and in a valid state to 941744947dcSTom Erickson * move. We're holding the locks needed to execute the critical section. 942744947dcSTom Erickson */ 943744947dcSTom Erickson dnode_move_impl(odn, ndn); 944744947dcSTom Erickson 945744947dcSTom Erickson list_link_replace(&odn->dn_link, &ndn->dn_link); 946744947dcSTom Erickson /* If the dnode was safe to move, the refcount cannot have changed. */ 947744947dcSTom Erickson ASSERT(refcount == refcount_count(&ndn->dn_holds)); 948744947dcSTom Erickson ASSERT(dbufs == ndn->dn_dbufs_count); 949744947dcSTom Erickson zrl_exit(&ndn->dn_handle->dnh_zrlock); /* handle has moved */ 950744947dcSTom Erickson mutex_exit(&os->os_lock); 951744947dcSTom Erickson 952744947dcSTom Erickson return (KMEM_CBRC_YES); 953744947dcSTom Erickson } 954744947dcSTom Erickson #endif /* _KERNEL */ 955744947dcSTom Erickson 956fa9e4066Sahrens void 957744947dcSTom Erickson dnode_special_close(dnode_handle_t *dnh) 958fa9e4066Sahrens { 959744947dcSTom Erickson dnode_t *dn = dnh->dnh_dnode; 960744947dcSTom Erickson 961ea8dc4b6Seschrock /* 962ea8dc4b6Seschrock * Wait for final references to the dnode to clear. This can 963ea8dc4b6Seschrock * only happen if the arc is asyncronously evicting state that 964ea8dc4b6Seschrock * has a hold on this dnode while we are trying to evict this 965ea8dc4b6Seschrock * dnode. 966ea8dc4b6Seschrock */ 967ea8dc4b6Seschrock while (refcount_count(&dn->dn_holds) > 0) 968ea8dc4b6Seschrock delay(1); 969744947dcSTom Erickson zrl_add(&dnh->dnh_zrlock); 970744947dcSTom Erickson dnode_destroy(dn); /* implicit zrl_remove() */ 971744947dcSTom Erickson zrl_destroy(&dnh->dnh_zrlock); 972744947dcSTom Erickson dnh->dnh_dnode = NULL; 973fa9e4066Sahrens } 974fa9e4066Sahrens 975fa9e4066Sahrens dnode_t * 976744947dcSTom Erickson dnode_special_open(objset_t *os, dnode_phys_t *dnp, uint64_t object, 977744947dcSTom Erickson dnode_handle_t *dnh) 978fa9e4066Sahrens { 979744947dcSTom Erickson dnode_t *dn = dnode_create(os, dnp, NULL, object, dnh); 980744947dcSTom Erickson dnh->dnh_dnode = dn; 981744947dcSTom Erickson zrl_init(&dnh->dnh_zrlock); 9829c9dc39aSek DNODE_VERIFY(dn); 983fa9e4066Sahrens return (dn); 984fa9e4066Sahrens } 985fa9e4066Sahrens 986fa9e4066Sahrens static void 987fa9e4066Sahrens dnode_buf_pageout(dmu_buf_t *db, void *arg) 988fa9e4066Sahrens { 989744947dcSTom Erickson dnode_children_t *children_dnodes = arg; 990fa9e4066Sahrens int i; 991fa9e4066Sahrens int epb = db->db_size >> DNODE_SHIFT; 992fa9e4066Sahrens 993744947dcSTom Erickson ASSERT(epb == children_dnodes->dnc_count); 994744947dcSTom Erickson 995fa9e4066Sahrens for (i = 0; i < epb; i++) { 996744947dcSTom Erickson dnode_handle_t *dnh = &children_dnodes->dnc_children[i]; 997744947dcSTom Erickson dnode_t *dn; 998fa9e4066Sahrens 999744947dcSTom Erickson /* 1000744947dcSTom Erickson * The dnode handle lock guards against the dnode moving to 1001744947dcSTom Erickson * another valid address, so there is no need here to guard 1002744947dcSTom Erickson * against changes to or from NULL. 1003744947dcSTom Erickson */ 1004744947dcSTom Erickson if (dnh->dnh_dnode == NULL) { 1005744947dcSTom Erickson zrl_destroy(&dnh->dnh_zrlock); 1006fa9e4066Sahrens continue; 1007744947dcSTom Erickson } 1008744947dcSTom Erickson 1009744947dcSTom Erickson zrl_add(&dnh->dnh_zrlock); 1010744947dcSTom Erickson dn = dnh->dnh_dnode; 1011fa9e4066Sahrens /* 1012fa9e4066Sahrens * If there are holds on this dnode, then there should 1013fa9e4066Sahrens * be holds on the dnode's containing dbuf as well; thus 1014744947dcSTom Erickson * it wouldn't be eligible for eviction and this function 1015fa9e4066Sahrens * would not have been called. 1016fa9e4066Sahrens */ 1017fa9e4066Sahrens ASSERT(refcount_is_zero(&dn->dn_holds)); 1018fa9e4066Sahrens ASSERT(refcount_is_zero(&dn->dn_tx_holds)); 1019fa9e4066Sahrens 1020744947dcSTom Erickson dnode_destroy(dn); /* implicit zrl_remove() */ 1021744947dcSTom Erickson zrl_destroy(&dnh->dnh_zrlock); 1022744947dcSTom Erickson dnh->dnh_dnode = NULL; 1023fa9e4066Sahrens } 1024744947dcSTom Erickson kmem_free(children_dnodes, sizeof (dnode_children_t) + 10257f18da4cSJustin T. Gibbs epb * sizeof (dnode_handle_t)); 1026fa9e4066Sahrens } 1027fa9e4066Sahrens 1028fa9e4066Sahrens /* 1029ea8dc4b6Seschrock * errors: 1030ea8dc4b6Seschrock * EINVAL - invalid object number. 1031ea8dc4b6Seschrock * EIO - i/o error. 1032ea8dc4b6Seschrock * succeeds even for free dnodes. 1033fa9e4066Sahrens */ 1034ea8dc4b6Seschrock int 1035503ad85cSMatthew Ahrens dnode_hold_impl(objset_t *os, uint64_t object, int flag, 1036ea8dc4b6Seschrock void *tag, dnode_t **dnp) 1037fa9e4066Sahrens { 1038ea8dc4b6Seschrock int epb, idx, err; 1039fa9e4066Sahrens int drop_struct_lock = FALSE; 1040ea8dc4b6Seschrock int type; 1041fa9e4066Sahrens uint64_t blk; 1042fa9e4066Sahrens dnode_t *mdn, *dn; 1043fa9e4066Sahrens dmu_buf_impl_t *db; 1044744947dcSTom Erickson dnode_children_t *children_dnodes; 1045744947dcSTom Erickson dnode_handle_t *dnh; 1046fa9e4066Sahrens 1047e14bb325SJeff Bonwick /* 1048e14bb325SJeff Bonwick * If you are holding the spa config lock as writer, you shouldn't 1049dcba9f3fSGeorge Wilson * be asking the DMU to do *anything* unless it's the root pool 1050dcba9f3fSGeorge Wilson * which may require us to read from the root filesystem while 1051dcba9f3fSGeorge Wilson * holding some (not all) of the locks as writer. 1052e14bb325SJeff Bonwick */ 1053dcba9f3fSGeorge Wilson ASSERT(spa_config_held(os->os_spa, SCL_ALL, RW_WRITER) == 0 || 1054dcba9f3fSGeorge Wilson (spa_is_root(os->os_spa) && 105544ecc532SGeorge Wilson spa_config_held(os->os_spa, SCL_STATE, RW_WRITER))); 1056e14bb325SJeff Bonwick 105714843421SMatthew Ahrens if (object == DMU_USERUSED_OBJECT || object == DMU_GROUPUSED_OBJECT) { 105814843421SMatthew Ahrens dn = (object == DMU_USERUSED_OBJECT) ? 1059744947dcSTom Erickson DMU_USERUSED_DNODE(os) : DMU_GROUPUSED_DNODE(os); 106014843421SMatthew Ahrens if (dn == NULL) 1061be6fd75aSMatthew Ahrens return (SET_ERROR(ENOENT)); 106214843421SMatthew Ahrens type = dn->dn_type; 106314843421SMatthew Ahrens if ((flag & DNODE_MUST_BE_ALLOCATED) && type == DMU_OT_NONE) 1064be6fd75aSMatthew Ahrens return (SET_ERROR(ENOENT)); 106514843421SMatthew Ahrens if ((flag & DNODE_MUST_BE_FREE) && type != DMU_OT_NONE) 1066be6fd75aSMatthew Ahrens return (SET_ERROR(EEXIST)); 106714843421SMatthew Ahrens DNODE_VERIFY(dn); 106814843421SMatthew Ahrens (void) refcount_add(&dn->dn_holds, tag); 106914843421SMatthew Ahrens *dnp = dn; 107014843421SMatthew Ahrens return (0); 107114843421SMatthew Ahrens } 107214843421SMatthew Ahrens 1073fa9e4066Sahrens if (object == 0 || object >= DN_MAX_OBJECT) 1074be6fd75aSMatthew Ahrens return (SET_ERROR(EINVAL)); 1075fa9e4066Sahrens 1076744947dcSTom Erickson mdn = DMU_META_DNODE(os); 1077744947dcSTom Erickson ASSERT(mdn->dn_object == DMU_META_DNODE_OBJECT); 1078fa9e4066Sahrens 10799c9dc39aSek DNODE_VERIFY(mdn); 1080fa9e4066Sahrens 1081fa9e4066Sahrens if (!RW_WRITE_HELD(&mdn->dn_struct_rwlock)) { 1082fa9e4066Sahrens rw_enter(&mdn->dn_struct_rwlock, RW_READER); 1083fa9e4066Sahrens drop_struct_lock = TRUE; 1084fa9e4066Sahrens } 1085fa9e4066Sahrens 1086fa9e4066Sahrens blk = dbuf_whichblock(mdn, object * sizeof (dnode_phys_t)); 1087fa9e4066Sahrens 1088ea8dc4b6Seschrock db = dbuf_hold(mdn, blk, FTAG); 1089fa9e4066Sahrens if (drop_struct_lock) 1090fa9e4066Sahrens rw_exit(&mdn->dn_struct_rwlock); 1091ea8dc4b6Seschrock if (db == NULL) 1092be6fd75aSMatthew Ahrens return (SET_ERROR(EIO)); 1093ea8dc4b6Seschrock err = dbuf_read(db, NULL, DB_RF_CANFAIL); 1094ea8dc4b6Seschrock if (err) { 1095ea8dc4b6Seschrock dbuf_rele(db, FTAG); 1096ea8dc4b6Seschrock return (err); 1097ea8dc4b6Seschrock } 1098fa9e4066Sahrens 1099fa9e4066Sahrens ASSERT3U(db->db.db_size, >=, 1<<DNODE_SHIFT); 1100fa9e4066Sahrens epb = db->db.db_size >> DNODE_SHIFT; 1101fa9e4066Sahrens 1102fa9e4066Sahrens idx = object & (epb-1); 1103fa9e4066Sahrens 1104744947dcSTom Erickson ASSERT(DB_DNODE(db)->dn_type == DMU_OT_DNODE); 1105fa9e4066Sahrens children_dnodes = dmu_buf_get_user(&db->db); 1106fa9e4066Sahrens if (children_dnodes == NULL) { 1107744947dcSTom Erickson int i; 1108744947dcSTom Erickson dnode_children_t *winner; 1109744947dcSTom Erickson children_dnodes = kmem_alloc(sizeof (dnode_children_t) + 11107f18da4cSJustin T. Gibbs epb * sizeof (dnode_handle_t), KM_SLEEP); 1111744947dcSTom Erickson children_dnodes->dnc_count = epb; 1112744947dcSTom Erickson dnh = &children_dnodes->dnc_children[0]; 1113744947dcSTom Erickson for (i = 0; i < epb; i++) { 1114744947dcSTom Erickson zrl_init(&dnh[i].dnh_zrlock); 1115744947dcSTom Erickson dnh[i].dnh_dnode = NULL; 1116744947dcSTom Erickson } 1117c1379625SJustin T. Gibbs if (winner = dmu_buf_set_user(&db->db, children_dnodes, 1118fa9e4066Sahrens dnode_buf_pageout)) { 1119d2b3cbbdSJorgen Lundman 1120d2b3cbbdSJorgen Lundman for (i = 0; i < epb; i++) { 1121d2b3cbbdSJorgen Lundman zrl_destroy(&dnh[i].dnh_zrlock); 1122d2b3cbbdSJorgen Lundman } 1123d2b3cbbdSJorgen Lundman 1124744947dcSTom Erickson kmem_free(children_dnodes, sizeof (dnode_children_t) + 11257f18da4cSJustin T. Gibbs epb * sizeof (dnode_handle_t)); 1126fa9e4066Sahrens children_dnodes = winner; 1127fa9e4066Sahrens } 1128fa9e4066Sahrens } 1129744947dcSTom Erickson ASSERT(children_dnodes->dnc_count == epb); 1130fa9e4066Sahrens 1131744947dcSTom Erickson dnh = &children_dnodes->dnc_children[idx]; 1132744947dcSTom Erickson zrl_add(&dnh->dnh_zrlock); 1133744947dcSTom Erickson if ((dn = dnh->dnh_dnode) == NULL) { 1134744947dcSTom Erickson dnode_phys_t *phys = (dnode_phys_t *)db->db.db_data+idx; 1135fa9e4066Sahrens dnode_t *winner; 11360e8c6158Smaybee 1137744947dcSTom Erickson dn = dnode_create(os, phys, db, object, dnh); 1138744947dcSTom Erickson winner = atomic_cas_ptr(&dnh->dnh_dnode, NULL, dn); 1139fa9e4066Sahrens if (winner != NULL) { 1140744947dcSTom Erickson zrl_add(&dnh->dnh_zrlock); 1141744947dcSTom Erickson dnode_destroy(dn); /* implicit zrl_remove() */ 1142fa9e4066Sahrens dn = winner; 1143fa9e4066Sahrens } 1144fa9e4066Sahrens } 1145fa9e4066Sahrens 1146fa9e4066Sahrens mutex_enter(&dn->dn_mtx); 1147ea8dc4b6Seschrock type = dn->dn_type; 1148fa9e4066Sahrens if (dn->dn_free_txg || 1149ea8dc4b6Seschrock ((flag & DNODE_MUST_BE_ALLOCATED) && type == DMU_OT_NONE) || 115014843421SMatthew Ahrens ((flag & DNODE_MUST_BE_FREE) && 115128d97a71SMark Shellenbaum (type != DMU_OT_NONE || !refcount_is_zero(&dn->dn_holds)))) { 1152fa9e4066Sahrens mutex_exit(&dn->dn_mtx); 1153744947dcSTom Erickson zrl_remove(&dnh->dnh_zrlock); 1154ea8dc4b6Seschrock dbuf_rele(db, FTAG); 1155ea8dc4b6Seschrock return (type == DMU_OT_NONE ? ENOENT : EEXIST); 1156fa9e4066Sahrens } 1157fa9e4066Sahrens mutex_exit(&dn->dn_mtx); 1158fa9e4066Sahrens 1159ea8dc4b6Seschrock if (refcount_add(&dn->dn_holds, tag) == 1) 1160744947dcSTom Erickson dbuf_add_ref(db, dnh); 1161744947dcSTom Erickson /* Now we can rely on the hold to prevent the dnode from moving. */ 1162744947dcSTom Erickson zrl_remove(&dnh->dnh_zrlock); 1163fa9e4066Sahrens 11649c9dc39aSek DNODE_VERIFY(dn); 1165fa9e4066Sahrens ASSERT3P(dn->dn_dbuf, ==, db); 1166fa9e4066Sahrens ASSERT3U(dn->dn_object, ==, object); 1167ea8dc4b6Seschrock dbuf_rele(db, FTAG); 1168fa9e4066Sahrens 1169ea8dc4b6Seschrock *dnp = dn; 1170ea8dc4b6Seschrock return (0); 1171fa9e4066Sahrens } 1172fa9e4066Sahrens 1173fa9e4066Sahrens /* 1174fa9e4066Sahrens * Return held dnode if the object is allocated, NULL if not. 1175fa9e4066Sahrens */ 1176ea8dc4b6Seschrock int 1177503ad85cSMatthew Ahrens dnode_hold(objset_t *os, uint64_t object, void *tag, dnode_t **dnp) 1178fa9e4066Sahrens { 1179ea8dc4b6Seschrock return (dnode_hold_impl(os, object, DNODE_MUST_BE_ALLOCATED, tag, dnp)); 1180fa9e4066Sahrens } 1181fa9e4066Sahrens 11821934e92fSmaybee /* 11831934e92fSmaybee * Can only add a reference if there is already at least one 11841934e92fSmaybee * reference on the dnode. Returns FALSE if unable to add a 11851934e92fSmaybee * new reference. 11861934e92fSmaybee */ 11871934e92fSmaybee boolean_t 1188ea8dc4b6Seschrock dnode_add_ref(dnode_t *dn, void *tag) 1189fa9e4066Sahrens { 11901934e92fSmaybee mutex_enter(&dn->dn_mtx); 11911934e92fSmaybee if (refcount_is_zero(&dn->dn_holds)) { 11921934e92fSmaybee mutex_exit(&dn->dn_mtx); 11931934e92fSmaybee return (FALSE); 11941934e92fSmaybee } 11951934e92fSmaybee VERIFY(1 < refcount_add(&dn->dn_holds, tag)); 11961934e92fSmaybee mutex_exit(&dn->dn_mtx); 11971934e92fSmaybee return (TRUE); 1198fa9e4066Sahrens } 1199fa9e4066Sahrens 1200fa9e4066Sahrens void 1201ea8dc4b6Seschrock dnode_rele(dnode_t *dn, void *tag) 1202fa9e4066Sahrens { 1203fa9e4066Sahrens uint64_t refs; 1204744947dcSTom Erickson /* Get while the hold prevents the dnode from moving. */ 1205744947dcSTom Erickson dmu_buf_impl_t *db = dn->dn_dbuf; 1206744947dcSTom Erickson dnode_handle_t *dnh = dn->dn_handle; 1207fa9e4066Sahrens 12081934e92fSmaybee mutex_enter(&dn->dn_mtx); 1209ea8dc4b6Seschrock refs = refcount_remove(&dn->dn_holds, tag); 12101934e92fSmaybee mutex_exit(&dn->dn_mtx); 1211744947dcSTom Erickson 1212744947dcSTom Erickson /* 1213744947dcSTom Erickson * It's unsafe to release the last hold on a dnode by dnode_rele() or 1214744947dcSTom Erickson * indirectly by dbuf_rele() while relying on the dnode handle to 1215744947dcSTom Erickson * prevent the dnode from moving, since releasing the last hold could 1216744947dcSTom Erickson * result in the dnode's parent dbuf evicting its dnode handles. For 1217744947dcSTom Erickson * that reason anyone calling dnode_rele() or dbuf_rele() without some 1218744947dcSTom Erickson * other direct or indirect hold on the dnode must first drop the dnode 1219744947dcSTom Erickson * handle. 1220744947dcSTom Erickson */ 1221744947dcSTom Erickson ASSERT(refs > 0 || dnh->dnh_zrlock.zr_owner != curthread); 1222744947dcSTom Erickson 1223fa9e4066Sahrens /* NOTE: the DNODE_DNODE does not have a dn_dbuf */ 1224744947dcSTom Erickson if (refs == 0 && db != NULL) { 1225744947dcSTom Erickson /* 1226744947dcSTom Erickson * Another thread could add a hold to the dnode handle in 1227744947dcSTom Erickson * dnode_hold_impl() while holding the parent dbuf. Since the 1228744947dcSTom Erickson * hold on the parent dbuf prevents the handle from being 1229744947dcSTom Erickson * destroyed, the hold on the handle is OK. We can't yet assert 1230744947dcSTom Erickson * that the handle has zero references, but that will be 1231744947dcSTom Erickson * asserted anyway when the handle gets destroyed. 1232744947dcSTom Erickson */ 1233744947dcSTom Erickson dbuf_rele(db, dnh); 1234744947dcSTom Erickson } 1235fa9e4066Sahrens } 1236fa9e4066Sahrens 1237fa9e4066Sahrens void 1238fa9e4066Sahrens dnode_setdirty(dnode_t *dn, dmu_tx_t *tx) 1239fa9e4066Sahrens { 1240503ad85cSMatthew Ahrens objset_t *os = dn->dn_objset; 1241fa9e4066Sahrens uint64_t txg = tx->tx_txg; 1242fa9e4066Sahrens 124314843421SMatthew Ahrens if (DMU_OBJECT_IS_SPECIAL(dn->dn_object)) { 124414843421SMatthew Ahrens dsl_dataset_dirty(os->os_dsl_dataset, tx); 1245fa9e4066Sahrens return; 124614843421SMatthew Ahrens } 1247fa9e4066Sahrens 12489c9dc39aSek DNODE_VERIFY(dn); 1249fa9e4066Sahrens 1250fa9e4066Sahrens #ifdef ZFS_DEBUG 1251fa9e4066Sahrens mutex_enter(&dn->dn_mtx); 1252fa9e4066Sahrens ASSERT(dn->dn_phys->dn_type || dn->dn_allocated_txg); 1253744947dcSTom Erickson ASSERT(dn->dn_free_txg == 0 || dn->dn_free_txg >= txg); 1254fa9e4066Sahrens mutex_exit(&dn->dn_mtx); 1255fa9e4066Sahrens #endif 1256fa9e4066Sahrens 12570a586ceaSMark Shellenbaum /* 12580a586ceaSMark Shellenbaum * Determine old uid/gid when necessary 12590a586ceaSMark Shellenbaum */ 126006e0070dSMark Shellenbaum dmu_objset_userquota_get_ids(dn, B_TRUE, tx); 12610a586ceaSMark Shellenbaum 1262fa9e4066Sahrens mutex_enter(&os->os_lock); 1263fa9e4066Sahrens 1264fa9e4066Sahrens /* 1265fa9e4066Sahrens * If we are already marked dirty, we're done. 1266fa9e4066Sahrens */ 1267c543ec06Sahrens if (list_link_active(&dn->dn_dirty_link[txg & TXG_MASK])) { 1268fa9e4066Sahrens mutex_exit(&os->os_lock); 1269fa9e4066Sahrens return; 1270fa9e4066Sahrens } 1271fa9e4066Sahrens 12720f6d88adSAlex Reece ASSERT(!refcount_is_zero(&dn->dn_holds) || 12730f6d88adSAlex Reece !avl_is_empty(&dn->dn_dbufs)); 1274fa9e4066Sahrens ASSERT(dn->dn_datablksz != 0); 1275fb09f5aaSMadhav Suresh ASSERT0(dn->dn_next_bonuslen[txg&TXG_MASK]); 1276fb09f5aaSMadhav Suresh ASSERT0(dn->dn_next_blksz[txg&TXG_MASK]); 1277fb09f5aaSMadhav Suresh ASSERT0(dn->dn_next_bonustype[txg&TXG_MASK]); 1278fa9e4066Sahrens 1279fa9e4066Sahrens dprintf_ds(os->os_dsl_dataset, "obj=%llu txg=%llu\n", 1280fa9e4066Sahrens dn->dn_object, txg); 1281fa9e4066Sahrens 1282fa9e4066Sahrens if (dn->dn_free_txg > 0 && dn->dn_free_txg <= txg) { 1283fa9e4066Sahrens list_insert_tail(&os->os_free_dnodes[txg&TXG_MASK], dn); 1284fa9e4066Sahrens } else { 1285fa9e4066Sahrens list_insert_tail(&os->os_dirty_dnodes[txg&TXG_MASK], dn); 1286fa9e4066Sahrens } 1287fa9e4066Sahrens 1288fa9e4066Sahrens mutex_exit(&os->os_lock); 1289fa9e4066Sahrens 1290fa9e4066Sahrens /* 1291fa9e4066Sahrens * The dnode maintains a hold on its containing dbuf as 1292fa9e4066Sahrens * long as there are holds on it. Each instantiated child 1293744947dcSTom Erickson * dbuf maintains a hold on the dnode. When the last child 1294fa9e4066Sahrens * drops its hold, the dnode will drop its hold on the 1295fa9e4066Sahrens * containing dbuf. We add a "dirty hold" here so that the 1296fa9e4066Sahrens * dnode will hang around after we finish processing its 1297fa9e4066Sahrens * children. 1298fa9e4066Sahrens */ 12991934e92fSmaybee VERIFY(dnode_add_ref(dn, (void *)(uintptr_t)tx->tx_txg)); 1300fa9e4066Sahrens 1301c717a561Smaybee (void) dbuf_dirty(dn->dn_dbuf, tx); 1302fa9e4066Sahrens 1303fa9e4066Sahrens dsl_dataset_dirty(os->os_dsl_dataset, tx); 1304fa9e4066Sahrens } 1305fa9e4066Sahrens 1306fa9e4066Sahrens void 1307fa9e4066Sahrens dnode_free(dnode_t *dn, dmu_tx_t *tx) 1308fa9e4066Sahrens { 1309c543ec06Sahrens int txgoff = tx->tx_txg & TXG_MASK; 1310c543ec06Sahrens 1311fa9e4066Sahrens dprintf("dn=%p txg=%llu\n", dn, tx->tx_txg); 1312fa9e4066Sahrens 1313fa9e4066Sahrens /* we should be the only holder... hopefully */ 1314fa9e4066Sahrens /* ASSERT3U(refcount_count(&dn->dn_holds), ==, 1); */ 1315fa9e4066Sahrens 1316fa9e4066Sahrens mutex_enter(&dn->dn_mtx); 1317fa9e4066Sahrens if (dn->dn_type == DMU_OT_NONE || dn->dn_free_txg) { 1318fa9e4066Sahrens mutex_exit(&dn->dn_mtx); 1319fa9e4066Sahrens return; 1320fa9e4066Sahrens } 1321fa9e4066Sahrens dn->dn_free_txg = tx->tx_txg; 1322fa9e4066Sahrens mutex_exit(&dn->dn_mtx); 1323fa9e4066Sahrens 1324fa9e4066Sahrens /* 1325fa9e4066Sahrens * If the dnode is already dirty, it needs to be moved from 1326fa9e4066Sahrens * the dirty list to the free list. 1327fa9e4066Sahrens */ 1328fa9e4066Sahrens mutex_enter(&dn->dn_objset->os_lock); 1329c543ec06Sahrens if (list_link_active(&dn->dn_dirty_link[txgoff])) { 1330c543ec06Sahrens list_remove(&dn->dn_objset->os_dirty_dnodes[txgoff], dn); 1331c543ec06Sahrens list_insert_tail(&dn->dn_objset->os_free_dnodes[txgoff], dn); 1332fa9e4066Sahrens mutex_exit(&dn->dn_objset->os_lock); 1333fa9e4066Sahrens } else { 1334fa9e4066Sahrens mutex_exit(&dn->dn_objset->os_lock); 1335fa9e4066Sahrens dnode_setdirty(dn, tx); 1336fa9e4066Sahrens } 1337fa9e4066Sahrens } 1338fa9e4066Sahrens 1339fa9e4066Sahrens /* 1340fa9e4066Sahrens * Try to change the block size for the indicated dnode. This can only 1341fa9e4066Sahrens * succeed if there are no blocks allocated or dirty beyond first block 1342fa9e4066Sahrens */ 1343fa9e4066Sahrens int 1344fa9e4066Sahrens dnode_set_blksz(dnode_t *dn, uint64_t size, int ibs, dmu_tx_t *tx) 1345fa9e4066Sahrens { 13460f6d88adSAlex Reece dmu_buf_impl_t *db; 1347cdb0ab79Smaybee int err; 1348fa9e4066Sahrens 1349b5152584SMatthew Ahrens ASSERT3U(size, <=, spa_maxblocksize(dmu_objset_spa(dn->dn_objset))); 1350fa9e4066Sahrens if (size == 0) 1351fa9e4066Sahrens size = SPA_MINBLOCKSIZE; 1352fa9e4066Sahrens else 1353fa9e4066Sahrens size = P2ROUNDUP(size, SPA_MINBLOCKSIZE); 1354fa9e4066Sahrens 1355b143e04bSahrens if (ibs == dn->dn_indblkshift) 1356b143e04bSahrens ibs = 0; 1357fa9e4066Sahrens 1358b143e04bSahrens if (size >> SPA_MINBLOCKSHIFT == dn->dn_datablkszsec && ibs == 0) 1359fa9e4066Sahrens return (0); 1360fa9e4066Sahrens 1361fa9e4066Sahrens rw_enter(&dn->dn_struct_rwlock, RW_WRITER); 1362fa9e4066Sahrens 1363fa9e4066Sahrens /* Check for any allocated blocks beyond the first */ 13640713e232SGeorge Wilson if (dn->dn_maxblkid != 0) 1365b143e04bSahrens goto fail; 1366fa9e4066Sahrens 1367fa9e4066Sahrens mutex_enter(&dn->dn_dbufs_mtx); 13680f6d88adSAlex Reece for (db = avl_first(&dn->dn_dbufs); db != NULL; 13690f6d88adSAlex Reece db = AVL_NEXT(&dn->dn_dbufs, db)) { 13700a586ceaSMark Shellenbaum if (db->db_blkid != 0 && db->db_blkid != DMU_BONUS_BLKID && 13710a586ceaSMark Shellenbaum db->db_blkid != DMU_SPILL_BLKID) { 1372fa9e4066Sahrens mutex_exit(&dn->dn_dbufs_mtx); 1373b143e04bSahrens goto fail; 1374fa9e4066Sahrens } 1375fa9e4066Sahrens } 1376fa9e4066Sahrens mutex_exit(&dn->dn_dbufs_mtx); 1377fa9e4066Sahrens 1378b143e04bSahrens if (ibs && dn->dn_nlevels != 1) 1379b143e04bSahrens goto fail; 1380b143e04bSahrens 1381cdb0ab79Smaybee /* resize the old block */ 1382cdb0ab79Smaybee err = dbuf_hold_impl(dn, 0, 0, TRUE, FTAG, &db); 1383cdb0ab79Smaybee if (err == 0) 1384c543ec06Sahrens dbuf_new_size(db, size, tx); 1385cdb0ab79Smaybee else if (err != ENOENT) 1386cdb0ab79Smaybee goto fail; 1387fa9e4066Sahrens 1388fa9e4066Sahrens dnode_setdblksz(dn, size); 1389c543ec06Sahrens dnode_setdirty(dn, tx); 1390c543ec06Sahrens dn->dn_next_blksz[tx->tx_txg&TXG_MASK] = size; 1391b143e04bSahrens if (ibs) { 1392b143e04bSahrens dn->dn_indblkshift = ibs; 1393b143e04bSahrens dn->dn_next_indblkshift[tx->tx_txg&TXG_MASK] = ibs; 1394b143e04bSahrens } 1395cdb0ab79Smaybee /* rele after we have fixed the blocksize in the dnode */ 1396c543ec06Sahrens if (db) 1397c543ec06Sahrens dbuf_rele(db, FTAG); 1398fa9e4066Sahrens 1399fa9e4066Sahrens rw_exit(&dn->dn_struct_rwlock); 1400b143e04bSahrens return (0); 1401b143e04bSahrens 1402b143e04bSahrens fail: 1403b143e04bSahrens rw_exit(&dn->dn_struct_rwlock); 1404be6fd75aSMatthew Ahrens return (SET_ERROR(ENOTSUP)); 1405fa9e4066Sahrens } 1406fa9e4066Sahrens 14078346f03fSJonathan W Adams /* read-holding callers must not rely on the lock being continuously held */ 1408fa9e4066Sahrens void 14098346f03fSJonathan W Adams dnode_new_blkid(dnode_t *dn, uint64_t blkid, dmu_tx_t *tx, boolean_t have_read) 1410fa9e4066Sahrens { 1411fa9e4066Sahrens uint64_t txgoff = tx->tx_txg & TXG_MASK; 1412c543ec06Sahrens int epbs, new_nlevels; 1413fa9e4066Sahrens uint64_t sz; 1414fa9e4066Sahrens 14150a586ceaSMark Shellenbaum ASSERT(blkid != DMU_BONUS_BLKID); 1416fa9e4066Sahrens 14178346f03fSJonathan W Adams ASSERT(have_read ? 14188346f03fSJonathan W Adams RW_READ_HELD(&dn->dn_struct_rwlock) : 14198346f03fSJonathan W Adams RW_WRITE_HELD(&dn->dn_struct_rwlock)); 14208346f03fSJonathan W Adams 14218346f03fSJonathan W Adams /* 14228346f03fSJonathan W Adams * if we have a read-lock, check to see if we need to do any work 14238346f03fSJonathan W Adams * before upgrading to a write-lock. 14248346f03fSJonathan W Adams */ 14258346f03fSJonathan W Adams if (have_read) { 14268346f03fSJonathan W Adams if (blkid <= dn->dn_maxblkid) 14278346f03fSJonathan W Adams return; 14288346f03fSJonathan W Adams 14298346f03fSJonathan W Adams if (!rw_tryupgrade(&dn->dn_struct_rwlock)) { 14308346f03fSJonathan W Adams rw_exit(&dn->dn_struct_rwlock); 14318346f03fSJonathan W Adams rw_enter(&dn->dn_struct_rwlock, RW_WRITER); 14328346f03fSJonathan W Adams } 1433fa9e4066Sahrens } 1434fa9e4066Sahrens 1435c543ec06Sahrens if (blkid <= dn->dn_maxblkid) 1436c543ec06Sahrens goto out; 1437c543ec06Sahrens 1438c543ec06Sahrens dn->dn_maxblkid = blkid; 1439fa9e4066Sahrens 1440fa9e4066Sahrens /* 1441c543ec06Sahrens * Compute the number of levels necessary to support the new maxblkid. 1442fa9e4066Sahrens */ 1443fa9e4066Sahrens new_nlevels = 1; 1444fa9e4066Sahrens epbs = dn->dn_indblkshift - SPA_BLKPTRSHIFT; 1445c543ec06Sahrens for (sz = dn->dn_nblkptr; 1446c543ec06Sahrens sz <= blkid && sz >= dn->dn_nblkptr; sz <<= epbs) 1447fa9e4066Sahrens new_nlevels++; 1448fa9e4066Sahrens 1449c543ec06Sahrens if (new_nlevels > dn->dn_nlevels) { 1450c543ec06Sahrens int old_nlevels = dn->dn_nlevels; 1451c543ec06Sahrens dmu_buf_impl_t *db; 1452c717a561Smaybee list_t *list; 1453c717a561Smaybee dbuf_dirty_record_t *new, *dr, *dr_next; 1454fa9e4066Sahrens 1455fa9e4066Sahrens dn->dn_nlevels = new_nlevels; 1456fa9e4066Sahrens 1457c543ec06Sahrens ASSERT3U(new_nlevels, >, dn->dn_next_nlevels[txgoff]); 1458c543ec06Sahrens dn->dn_next_nlevels[txgoff] = new_nlevels; 1459c543ec06Sahrens 1460c717a561Smaybee /* dirty the left indirects */ 1461c543ec06Sahrens db = dbuf_hold_level(dn, old_nlevels, 0, FTAG); 146201025c89SJohn Harres ASSERT(db != NULL); 1463c717a561Smaybee new = dbuf_dirty(db, tx); 1464ea8dc4b6Seschrock dbuf_rele(db, FTAG); 1465fa9e4066Sahrens 1466c717a561Smaybee /* transfer the dirty records to the new indirect */ 1467c717a561Smaybee mutex_enter(&dn->dn_mtx); 1468c717a561Smaybee mutex_enter(&new->dt.di.dr_mtx); 1469c717a561Smaybee list = &dn->dn_dirty_records[txgoff]; 1470c717a561Smaybee for (dr = list_head(list); dr; dr = dr_next) { 1471c717a561Smaybee dr_next = list_next(&dn->dn_dirty_records[txgoff], dr); 1472c717a561Smaybee if (dr->dr_dbuf->db_level != new_nlevels-1 && 14730a586ceaSMark Shellenbaum dr->dr_dbuf->db_blkid != DMU_BONUS_BLKID && 14740a586ceaSMark Shellenbaum dr->dr_dbuf->db_blkid != DMU_SPILL_BLKID) { 1475c717a561Smaybee ASSERT(dr->dr_dbuf->db_level == old_nlevels-1); 1476c717a561Smaybee list_remove(&dn->dn_dirty_records[txgoff], dr); 1477c717a561Smaybee list_insert_tail(&new->dt.di.dr_children, dr); 1478c717a561Smaybee dr->dr_parent = new; 1479c717a561Smaybee } 1480c717a561Smaybee } 1481c717a561Smaybee mutex_exit(&new->dt.di.dr_mtx); 1482c717a561Smaybee mutex_exit(&dn->dn_mtx); 1483fa9e4066Sahrens } 1484fa9e4066Sahrens 1485fa9e4066Sahrens out: 14868346f03fSJonathan W Adams if (have_read) 14878346f03fSJonathan W Adams rw_downgrade(&dn->dn_struct_rwlock); 1488fa9e4066Sahrens } 1489fa9e4066Sahrens 1490fa9e4066Sahrens void 1491fa9e4066Sahrens dnode_free_range(dnode_t *dn, uint64_t off, uint64_t len, dmu_tx_t *tx) 1492fa9e4066Sahrens { 1493fa9e4066Sahrens dmu_buf_impl_t *db; 1494b143e04bSahrens uint64_t blkoff, blkid, nblks; 1495cdb0ab79Smaybee int blksz, blkshift, head, tail; 1496fa9e4066Sahrens int trunc = FALSE; 1497cdb0ab79Smaybee int epbs; 1498fa9e4066Sahrens 1499fa9e4066Sahrens rw_enter(&dn->dn_struct_rwlock, RW_WRITER); 1500fa9e4066Sahrens blksz = dn->dn_datablksz; 1501cdb0ab79Smaybee blkshift = dn->dn_datablkshift; 1502cdb0ab79Smaybee epbs = dn->dn_indblkshift - SPA_BLKPTRSHIFT; 1503fa9e4066Sahrens 1504713d6c20SMatthew Ahrens if (len == DMU_OBJECT_END) { 1505fa9e4066Sahrens len = UINT64_MAX - off; 1506fa9e4066Sahrens trunc = TRUE; 1507fa9e4066Sahrens } 1508fa9e4066Sahrens 1509fa9e4066Sahrens /* 1510fa9e4066Sahrens * First, block align the region to free: 1511fa9e4066Sahrens */ 1512b143e04bSahrens if (ISP2(blksz)) { 1513b143e04bSahrens head = P2NPHASE(off, blksz); 1514b143e04bSahrens blkoff = P2PHASE(off, blksz); 1515cdb0ab79Smaybee if ((off >> blkshift) > dn->dn_maxblkid) 1516cdb0ab79Smaybee goto out; 1517b143e04bSahrens } else { 1518b143e04bSahrens ASSERT(dn->dn_maxblkid == 0); 1519b143e04bSahrens if (off == 0 && len >= blksz) { 152043466aaeSMax Grossman /* 152143466aaeSMax Grossman * Freeing the whole block; fast-track this request. 152243466aaeSMax Grossman * Note that we won't dirty any indirect blocks, 152343466aaeSMax Grossman * which is fine because we will be freeing the entire 152443466aaeSMax Grossman * file and thus all indirect blocks will be freed 152543466aaeSMax Grossman * by free_children(). 152643466aaeSMax Grossman */ 1527cdb0ab79Smaybee blkid = 0; 1528cdb0ab79Smaybee nblks = 1; 1529cdb0ab79Smaybee goto done; 15301c8564a7SMark Maybee } else if (off >= blksz) { 1531cdb0ab79Smaybee /* Freeing past end-of-data */ 1532cdb0ab79Smaybee goto out; 1533fa9e4066Sahrens } else { 1534b143e04bSahrens /* Freeing part of the block. */ 1535fa9e4066Sahrens head = blksz - off; 1536fa9e4066Sahrens ASSERT3U(head, >, 0); 1537fa9e4066Sahrens } 1538b143e04bSahrens blkoff = off; 1539fa9e4066Sahrens } 1540fa9e4066Sahrens /* zero out any partial block data at the start of the range */ 1541fa9e4066Sahrens if (head) { 1542b143e04bSahrens ASSERT3U(blkoff + head, ==, blksz); 1543fa9e4066Sahrens if (len < head) 1544fa9e4066Sahrens head = len; 1545fa9e4066Sahrens if (dbuf_hold_impl(dn, 0, dbuf_whichblock(dn, off), TRUE, 1546fa9e4066Sahrens FTAG, &db) == 0) { 1547fa9e4066Sahrens caddr_t data; 1548fa9e4066Sahrens 1549fa9e4066Sahrens /* don't dirty if it isn't on disk and isn't dirty */ 1550c717a561Smaybee if (db->db_last_dirty || 1551fa9e4066Sahrens (db->db_blkptr && !BP_IS_HOLE(db->db_blkptr))) { 1552fa9e4066Sahrens rw_exit(&dn->dn_struct_rwlock); 155343466aaeSMax Grossman dmu_buf_will_dirty(&db->db, tx); 1554fa9e4066Sahrens rw_enter(&dn->dn_struct_rwlock, RW_WRITER); 1555fa9e4066Sahrens data = db->db.db_data; 1556b143e04bSahrens bzero(data + blkoff, head); 1557fa9e4066Sahrens } 1558ea8dc4b6Seschrock dbuf_rele(db, FTAG); 1559fa9e4066Sahrens } 1560fa9e4066Sahrens off += head; 1561fa9e4066Sahrens len -= head; 1562fa9e4066Sahrens } 1563fa9e4066Sahrens 1564b143e04bSahrens /* If the range was less than one block, we're done */ 1565cdb0ab79Smaybee if (len == 0) 1566fa9e4066Sahrens goto out; 1567fa9e4066Sahrens 1568cdb0ab79Smaybee /* If the remaining range is past end of file, we're done */ 1569cdb0ab79Smaybee if ((off >> blkshift) > dn->dn_maxblkid) 1570cdb0ab79Smaybee goto out; 1571b143e04bSahrens 15721c8564a7SMark Maybee ASSERT(ISP2(blksz)); 1573cdb0ab79Smaybee if (trunc) 1574cdb0ab79Smaybee tail = 0; 1575cdb0ab79Smaybee else 1576cdb0ab79Smaybee tail = P2PHASE(len, blksz); 1577cdb0ab79Smaybee 1578fb09f5aaSMadhav Suresh ASSERT0(P2PHASE(off, blksz)); 1579cdb0ab79Smaybee /* zero out any partial block data at the end of the range */ 1580cdb0ab79Smaybee if (tail) { 1581cdb0ab79Smaybee if (len < tail) 1582cdb0ab79Smaybee tail = len; 1583cdb0ab79Smaybee if (dbuf_hold_impl(dn, 0, dbuf_whichblock(dn, off+len), 1584cdb0ab79Smaybee TRUE, FTAG, &db) == 0) { 1585cdb0ab79Smaybee /* don't dirty if not on disk and not dirty */ 1586cdb0ab79Smaybee if (db->db_last_dirty || 1587cdb0ab79Smaybee (db->db_blkptr && !BP_IS_HOLE(db->db_blkptr))) { 1588cdb0ab79Smaybee rw_exit(&dn->dn_struct_rwlock); 158943466aaeSMax Grossman dmu_buf_will_dirty(&db->db, tx); 1590cdb0ab79Smaybee rw_enter(&dn->dn_struct_rwlock, RW_WRITER); 1591cdb0ab79Smaybee bzero(db->db.db_data, tail); 1592fa9e4066Sahrens } 1593ea8dc4b6Seschrock dbuf_rele(db, FTAG); 1594fa9e4066Sahrens } 1595cdb0ab79Smaybee len -= tail; 1596cdb0ab79Smaybee } 1597fa9e4066Sahrens 1598cdb0ab79Smaybee /* If the range did not include a full block, we are done */ 1599cdb0ab79Smaybee if (len == 0) 1600cdb0ab79Smaybee goto out; 1601fa9e4066Sahrens 1602cdb0ab79Smaybee ASSERT(IS_P2ALIGNED(off, blksz)); 1603cdb0ab79Smaybee ASSERT(trunc || IS_P2ALIGNED(len, blksz)); 1604cdb0ab79Smaybee blkid = off >> blkshift; 1605cdb0ab79Smaybee nblks = len >> blkshift; 1606cdb0ab79Smaybee if (trunc) 1607cdb0ab79Smaybee nblks += 1; 1608cdb0ab79Smaybee 1609cdb0ab79Smaybee /* 161043466aaeSMax Grossman * Dirty the first and last indirect blocks, as they (and/or their 161143466aaeSMax Grossman * parents) will need to be written out if they were only 161243466aaeSMax Grossman * partially freed. Interior indirect blocks will be themselves freed, 161343466aaeSMax Grossman * by free_children(), so they need not be dirtied. Note that these 161443466aaeSMax Grossman * interior blocks have already been prefetched by dmu_tx_hold_free(). 1615cdb0ab79Smaybee */ 1616cdb0ab79Smaybee if (dn->dn_nlevels > 1) { 161743466aaeSMax Grossman uint64_t first, last; 1618b143e04bSahrens 1619cdb0ab79Smaybee first = blkid >> epbs; 162056d55a53Smaybee if (db = dbuf_hold_level(dn, 1, first, FTAG)) { 162143466aaeSMax Grossman dmu_buf_will_dirty(&db->db, tx); 162256d55a53Smaybee dbuf_rele(db, FTAG); 162356d55a53Smaybee } 1624b143e04bSahrens if (trunc) 1625cdb0ab79Smaybee last = dn->dn_maxblkid >> epbs; 1626cdb0ab79Smaybee else 1627cdb0ab79Smaybee last = (blkid + nblks - 1) >> epbs; 162856d55a53Smaybee if (last > first && (db = dbuf_hold_level(dn, 1, last, FTAG))) { 162943466aaeSMax Grossman dmu_buf_will_dirty(&db->db, tx); 163056d55a53Smaybee dbuf_rele(db, FTAG); 163156d55a53Smaybee } 1632fa9e4066Sahrens } 163343466aaeSMax Grossman 1634cdb0ab79Smaybee done: 1635cdb0ab79Smaybee /* 1636cdb0ab79Smaybee * Add this range to the dnode range list. 1637cdb0ab79Smaybee * We will finish up this free operation in the syncing phase. 1638cdb0ab79Smaybee */ 1639fa9e4066Sahrens mutex_enter(&dn->dn_mtx); 1640bf16b11eSMatthew Ahrens int txgoff = tx->tx_txg & TXG_MASK; 1641bf16b11eSMatthew Ahrens if (dn->dn_free_ranges[txgoff] == NULL) { 1642bf16b11eSMatthew Ahrens dn->dn_free_ranges[txgoff] = 1643bf16b11eSMatthew Ahrens range_tree_create(NULL, NULL, &dn->dn_mtx); 1644fa9e4066Sahrens } 1645bf16b11eSMatthew Ahrens range_tree_clear(dn->dn_free_ranges[txgoff], blkid, nblks); 1646bf16b11eSMatthew Ahrens range_tree_add(dn->dn_free_ranges[txgoff], blkid, nblks); 1647bf16b11eSMatthew Ahrens dprintf_dnode(dn, "blkid=%llu nblks=%llu txg=%llu\n", 1648bf16b11eSMatthew Ahrens blkid, nblks, tx->tx_txg); 1649fa9e4066Sahrens mutex_exit(&dn->dn_mtx); 1650fa9e4066Sahrens 1651cdb0ab79Smaybee dbuf_free_range(dn, blkid, blkid + nblks - 1, tx); 1652fa9e4066Sahrens dnode_setdirty(dn, tx); 1653fa9e4066Sahrens out: 1654cdb0ab79Smaybee 1655fa9e4066Sahrens rw_exit(&dn->dn_struct_rwlock); 1656fa9e4066Sahrens } 1657fa9e4066Sahrens 16580a586ceaSMark Shellenbaum static boolean_t 16590a586ceaSMark Shellenbaum dnode_spill_freed(dnode_t *dn) 16600a586ceaSMark Shellenbaum { 16610a586ceaSMark Shellenbaum int i; 16620a586ceaSMark Shellenbaum 16630a586ceaSMark Shellenbaum mutex_enter(&dn->dn_mtx); 16640a586ceaSMark Shellenbaum for (i = 0; i < TXG_SIZE; i++) { 16650a586ceaSMark Shellenbaum if (dn->dn_rm_spillblk[i] == DN_KILL_SPILLBLK) 16660a586ceaSMark Shellenbaum break; 16670a586ceaSMark Shellenbaum } 16680a586ceaSMark Shellenbaum mutex_exit(&dn->dn_mtx); 16690a586ceaSMark Shellenbaum return (i < TXG_SIZE); 16700a586ceaSMark Shellenbaum } 16710a586ceaSMark Shellenbaum 1672fa9e4066Sahrens /* return TRUE if this blkid was freed in a recent txg, or FALSE if it wasn't */ 1673fa9e4066Sahrens uint64_t 1674fa9e4066Sahrens dnode_block_freed(dnode_t *dn, uint64_t blkid) 1675fa9e4066Sahrens { 1676fa9e4066Sahrens void *dp = spa_get_dsl(dn->dn_objset->os_spa); 1677fa9e4066Sahrens int i; 1678fa9e4066Sahrens 16790a586ceaSMark Shellenbaum if (blkid == DMU_BONUS_BLKID) 1680fa9e4066Sahrens return (FALSE); 1681fa9e4066Sahrens 1682fa9e4066Sahrens /* 1683fa9e4066Sahrens * If we're in the process of opening the pool, dp will not be 1684fa9e4066Sahrens * set yet, but there shouldn't be anything dirty. 1685fa9e4066Sahrens */ 1686fa9e4066Sahrens if (dp == NULL) 1687fa9e4066Sahrens return (FALSE); 1688fa9e4066Sahrens 1689fa9e4066Sahrens if (dn->dn_free_txg) 1690fa9e4066Sahrens return (TRUE); 1691fa9e4066Sahrens 16920a586ceaSMark Shellenbaum if (blkid == DMU_SPILL_BLKID) 16930a586ceaSMark Shellenbaum return (dnode_spill_freed(dn)); 16940a586ceaSMark Shellenbaum 1695fa9e4066Sahrens mutex_enter(&dn->dn_mtx); 1696fa9e4066Sahrens for (i = 0; i < TXG_SIZE; i++) { 1697bf16b11eSMatthew Ahrens if (dn->dn_free_ranges[i] != NULL && 1698bf16b11eSMatthew Ahrens range_tree_contains(dn->dn_free_ranges[i], blkid, 1)) 1699fa9e4066Sahrens break; 1700fa9e4066Sahrens } 1701fa9e4066Sahrens mutex_exit(&dn->dn_mtx); 1702fa9e4066Sahrens return (i < TXG_SIZE); 1703fa9e4066Sahrens } 1704fa9e4066Sahrens 1705fa9e4066Sahrens /* call from syncing context when we actually write/free space for this dnode */ 1706fa9e4066Sahrens void 170799653d4eSeschrock dnode_diduse_space(dnode_t *dn, int64_t delta) 1708fa9e4066Sahrens { 170999653d4eSeschrock uint64_t space; 171099653d4eSeschrock dprintf_dnode(dn, "dn=%p dnp=%p used=%llu delta=%lld\n", 1711fa9e4066Sahrens dn, dn->dn_phys, 171299653d4eSeschrock (u_longlong_t)dn->dn_phys->dn_used, 171399653d4eSeschrock (longlong_t)delta); 1714fa9e4066Sahrens 1715fa9e4066Sahrens mutex_enter(&dn->dn_mtx); 171699653d4eSeschrock space = DN_USED_BYTES(dn->dn_phys); 171799653d4eSeschrock if (delta > 0) { 171899653d4eSeschrock ASSERT3U(space + delta, >=, space); /* no overflow */ 171999653d4eSeschrock } else { 172099653d4eSeschrock ASSERT3U(space, >=, -delta); /* no underflow */ 172199653d4eSeschrock } 172299653d4eSeschrock space += delta; 1723e7437265Sahrens if (spa_version(dn->dn_objset->os_spa) < SPA_VERSION_DNODE_BYTES) { 172499653d4eSeschrock ASSERT((dn->dn_phys->dn_flags & DNODE_FLAG_USED_BYTES) == 0); 1725fb09f5aaSMadhav Suresh ASSERT0(P2PHASE(space, 1<<DEV_BSHIFT)); 172699653d4eSeschrock dn->dn_phys->dn_used = space >> DEV_BSHIFT; 1727fa9e4066Sahrens } else { 172899653d4eSeschrock dn->dn_phys->dn_used = space; 172999653d4eSeschrock dn->dn_phys->dn_flags |= DNODE_FLAG_USED_BYTES; 1730fa9e4066Sahrens } 1731fa9e4066Sahrens mutex_exit(&dn->dn_mtx); 1732fa9e4066Sahrens } 1733fa9e4066Sahrens 1734fa9e4066Sahrens /* 173569962b56SMatthew Ahrens * Call when we think we're going to write/free space in open context to track 173669962b56SMatthew Ahrens * the amount of memory in use by the currently open txg. 1737fa9e4066Sahrens */ 1738fa9e4066Sahrens void 1739fa9e4066Sahrens dnode_willuse_space(dnode_t *dn, int64_t space, dmu_tx_t *tx) 1740fa9e4066Sahrens { 1741503ad85cSMatthew Ahrens objset_t *os = dn->dn_objset; 1742fa9e4066Sahrens dsl_dataset_t *ds = os->os_dsl_dataset; 174369962b56SMatthew Ahrens int64_t aspace = spa_get_asize(os->os_spa, space); 1744fa9e4066Sahrens 174569962b56SMatthew Ahrens if (ds != NULL) { 174669962b56SMatthew Ahrens dsl_dir_willuse_space(ds->ds_dir, aspace, tx); 174769962b56SMatthew Ahrens dsl_pool_dirty_space(dmu_tx_pool(tx), space, tx); 174869962b56SMatthew Ahrens } 1749fa9e4066Sahrens 175069962b56SMatthew Ahrens dmu_tx_willuse_space(tx, aspace); 1751fa9e4066Sahrens } 1752fa9e4066Sahrens 175376256205SMark Maybee /* 1754f7170741SWill Andrews * Scans a block at the indicated "level" looking for a hole or data, 1755f7170741SWill Andrews * depending on 'flags'. 1756f7170741SWill Andrews * 1757f7170741SWill Andrews * If level > 0, then we are scanning an indirect block looking at its 1758f7170741SWill Andrews * pointers. If level == 0, then we are looking at a block of dnodes. 1759f7170741SWill Andrews * 1760f7170741SWill Andrews * If we don't find what we are looking for in the block, we return ESRCH. 1761f7170741SWill Andrews * Otherwise, return with *offset pointing to the beginning (if searching 1762f7170741SWill Andrews * forwards) or end (if searching backwards) of the range covered by the 1763f7170741SWill Andrews * block pointer we matched on (or dnode). 176476256205SMark Maybee * 176576256205SMark Maybee * The basic search algorithm used below by dnode_next_offset() is to 176676256205SMark Maybee * use this function to search up the block tree (widen the search) until 176776256205SMark Maybee * we find something (i.e., we don't return ESRCH) and then search back 176876256205SMark Maybee * down the tree (narrow the search) until we reach our original search 176976256205SMark Maybee * level. 177076256205SMark Maybee */ 1771fa9e4066Sahrens static int 1772cdb0ab79Smaybee dnode_next_offset_level(dnode_t *dn, int flags, uint64_t *offset, 17736754306eSahrens int lvl, uint64_t blkfill, uint64_t txg) 1774fa9e4066Sahrens { 1775fa9e4066Sahrens dmu_buf_impl_t *db = NULL; 1776fa9e4066Sahrens void *data = NULL; 1777fa9e4066Sahrens uint64_t epbs = dn->dn_phys->dn_indblkshift - SPA_BLKPTRSHIFT; 1778fa9e4066Sahrens uint64_t epb = 1ULL << epbs; 1779fa9e4066Sahrens uint64_t minfill, maxfill; 1780cdb0ab79Smaybee boolean_t hole; 1781cdb0ab79Smaybee int i, inc, error, span; 1782fa9e4066Sahrens 1783fa9e4066Sahrens dprintf("probing object %llu offset %llx level %d of %u\n", 1784fa9e4066Sahrens dn->dn_object, *offset, lvl, dn->dn_phys->dn_nlevels); 1785fa9e4066Sahrens 178614843421SMatthew Ahrens hole = ((flags & DNODE_FIND_HOLE) != 0); 1787cdb0ab79Smaybee inc = (flags & DNODE_FIND_BACKWARDS) ? -1 : 1; 17881c8564a7SMark Maybee ASSERT(txg == 0 || !hole); 1789cdb0ab79Smaybee 1790fa9e4066Sahrens if (lvl == dn->dn_phys->dn_nlevels) { 1791fa9e4066Sahrens error = 0; 1792fa9e4066Sahrens epb = dn->dn_phys->dn_nblkptr; 1793fa9e4066Sahrens data = dn->dn_phys->dn_blkptr; 1794fa9e4066Sahrens } else { 1795fa9e4066Sahrens uint64_t blkid = dbuf_whichblock(dn, *offset) >> (epbs * lvl); 1796fa9e4066Sahrens error = dbuf_hold_impl(dn, lvl, blkid, TRUE, FTAG, &db); 1797fa9e4066Sahrens if (error) { 17981c8564a7SMark Maybee if (error != ENOENT) 17991c8564a7SMark Maybee return (error); 18001c8564a7SMark Maybee if (hole) 18011c8564a7SMark Maybee return (0); 18021c8564a7SMark Maybee /* 18031c8564a7SMark Maybee * This can only happen when we are searching up 18041c8564a7SMark Maybee * the block tree for data. We don't really need to 18051c8564a7SMark Maybee * adjust the offset, as we will just end up looking 18061c8564a7SMark Maybee * at the pointer to this block in its parent, and its 18071c8564a7SMark Maybee * going to be unallocated, so we will skip over it. 18081c8564a7SMark Maybee */ 1809be6fd75aSMatthew Ahrens return (SET_ERROR(ESRCH)); 1810fa9e4066Sahrens } 181198572ac1Sahrens error = dbuf_read(db, NULL, DB_RF_CANFAIL | DB_RF_HAVESTRUCT); 181298572ac1Sahrens if (error) { 181398572ac1Sahrens dbuf_rele(db, FTAG); 181498572ac1Sahrens return (error); 181598572ac1Sahrens } 1816fa9e4066Sahrens data = db->db.db_data; 1817fa9e4066Sahrens } 1818fa9e4066Sahrens 181943466aaeSMax Grossman 182043466aaeSMax Grossman if (db != NULL && txg != 0 && (db->db_blkptr == NULL || 182143466aaeSMax Grossman db->db_blkptr->blk_birth <= txg || 182243466aaeSMax Grossman BP_IS_HOLE(db->db_blkptr))) { 18231c8564a7SMark Maybee /* 18241c8564a7SMark Maybee * This can only happen when we are searching up the tree 18251c8564a7SMark Maybee * and these conditions mean that we need to keep climbing. 18261c8564a7SMark Maybee */ 1827be6fd75aSMatthew Ahrens error = SET_ERROR(ESRCH); 18286754306eSahrens } else if (lvl == 0) { 1829fa9e4066Sahrens dnode_phys_t *dnp = data; 1830fa9e4066Sahrens span = DNODE_SHIFT; 1831fa9e4066Sahrens ASSERT(dn->dn_type == DMU_OT_DNODE); 1832fa9e4066Sahrens 1833cdb0ab79Smaybee for (i = (*offset >> span) & (blkfill - 1); 1834cdb0ab79Smaybee i >= 0 && i < blkfill; i += inc) { 183508f3f137SJonathan W Adams if ((dnp[i].dn_type == DMU_OT_NONE) == hole) 1836fa9e4066Sahrens break; 1837cdb0ab79Smaybee *offset += (1ULL << span) * inc; 1838fa9e4066Sahrens } 1839cdb0ab79Smaybee if (i < 0 || i == blkfill) 1840be6fd75aSMatthew Ahrens error = SET_ERROR(ESRCH); 1841fa9e4066Sahrens } else { 1842fa9e4066Sahrens blkptr_t *bp = data; 184376256205SMark Maybee uint64_t start = *offset; 1844fa9e4066Sahrens span = (lvl - 1) * epbs + dn->dn_datablkshift; 1845fa9e4066Sahrens minfill = 0; 1846fa9e4066Sahrens maxfill = blkfill << ((lvl - 1) * epbs); 1847fa9e4066Sahrens 1848fa9e4066Sahrens if (hole) 1849fa9e4066Sahrens maxfill--; 1850fa9e4066Sahrens else 1851fa9e4066Sahrens minfill++; 1852fa9e4066Sahrens 185376256205SMark Maybee *offset = *offset >> span; 185476256205SMark Maybee for (i = BF64_GET(*offset, 0, epbs); 1855cdb0ab79Smaybee i >= 0 && i < epb; i += inc) { 18565d7b4d43SMatthew Ahrens if (BP_GET_FILL(&bp[i]) >= minfill && 18575d7b4d43SMatthew Ahrens BP_GET_FILL(&bp[i]) <= maxfill && 18581c8564a7SMark Maybee (hole || bp[i].blk_birth > txg)) 1859fa9e4066Sahrens break; 186076256205SMark Maybee if (inc > 0 || *offset > 0) 186176256205SMark Maybee *offset += inc; 186276256205SMark Maybee } 186376256205SMark Maybee *offset = *offset << span; 186476256205SMark Maybee if (inc < 0) { 186576256205SMark Maybee /* traversing backwards; position offset at the end */ 186676256205SMark Maybee ASSERT3U(*offset, <=, start); 186776256205SMark Maybee *offset = MIN(*offset + (1ULL << span) - 1, start); 186876256205SMark Maybee } else if (*offset < start) { 186976256205SMark Maybee *offset = start; 1870fa9e4066Sahrens } 187176256205SMark Maybee if (i < 0 || i >= epb) 1872be6fd75aSMatthew Ahrens error = SET_ERROR(ESRCH); 1873fa9e4066Sahrens } 1874fa9e4066Sahrens 1875fa9e4066Sahrens if (db) 1876ea8dc4b6Seschrock dbuf_rele(db, FTAG); 1877fa9e4066Sahrens 1878fa9e4066Sahrens return (error); 1879fa9e4066Sahrens } 1880fa9e4066Sahrens 1881fa9e4066Sahrens /* 1882fa9e4066Sahrens * Find the next hole, data, or sparse region at or after *offset. 1883fa9e4066Sahrens * The value 'blkfill' tells us how many items we expect to find 1884fa9e4066Sahrens * in an L0 data block; this value is 1 for normal objects, 1885fa9e4066Sahrens * DNODES_PER_BLOCK for the meta dnode, and some fraction of 1886fa9e4066Sahrens * DNODES_PER_BLOCK when searching for sparse regions thereof. 18876754306eSahrens * 1888fa9e4066Sahrens * Examples: 1889fa9e4066Sahrens * 1890cdb0ab79Smaybee * dnode_next_offset(dn, flags, offset, 1, 1, 0); 1891cdb0ab79Smaybee * Finds the next/previous hole/data in a file. 1892fa9e4066Sahrens * Used in dmu_offset_next(). 1893fa9e4066Sahrens * 1894cdb0ab79Smaybee * dnode_next_offset(mdn, flags, offset, 0, DNODES_PER_BLOCK, txg); 1895fa9e4066Sahrens * Finds the next free/allocated dnode an objset's meta-dnode. 18966754306eSahrens * Only finds objects that have new contents since txg (ie. 18976754306eSahrens * bonus buffer changes and content removal are ignored). 1898fa9e4066Sahrens * Used in dmu_object_next(). 1899fa9e4066Sahrens * 1900cdb0ab79Smaybee * dnode_next_offset(mdn, DNODE_FIND_HOLE, offset, 2, DNODES_PER_BLOCK >> 2, 0); 1901fa9e4066Sahrens * Finds the next L2 meta-dnode bp that's at most 1/4 full. 1902fa9e4066Sahrens * Used in dmu_object_alloc(). 1903fa9e4066Sahrens */ 1904fa9e4066Sahrens int 1905cdb0ab79Smaybee dnode_next_offset(dnode_t *dn, int flags, uint64_t *offset, 19066754306eSahrens int minlvl, uint64_t blkfill, uint64_t txg) 1907fa9e4066Sahrens { 1908cdb0ab79Smaybee uint64_t initial_offset = *offset; 1909fa9e4066Sahrens int lvl, maxlvl; 1910fa9e4066Sahrens int error = 0; 1911fa9e4066Sahrens 1912cdb0ab79Smaybee if (!(flags & DNODE_FIND_HAVELOCK)) 1913cdb0ab79Smaybee rw_enter(&dn->dn_struct_rwlock, RW_READER); 1914fa9e4066Sahrens 1915fa9e4066Sahrens if (dn->dn_phys->dn_nlevels == 0) { 1916be6fd75aSMatthew Ahrens error = SET_ERROR(ESRCH); 1917cdb0ab79Smaybee goto out; 1918fa9e4066Sahrens } 1919fa9e4066Sahrens 1920fa9e4066Sahrens if (dn->dn_datablkshift == 0) { 1921fa9e4066Sahrens if (*offset < dn->dn_datablksz) { 1922cdb0ab79Smaybee if (flags & DNODE_FIND_HOLE) 1923fa9e4066Sahrens *offset = dn->dn_datablksz; 1924fa9e4066Sahrens } else { 1925be6fd75aSMatthew Ahrens error = SET_ERROR(ESRCH); 1926fa9e4066Sahrens } 1927cdb0ab79Smaybee goto out; 1928fa9e4066Sahrens } 1929fa9e4066Sahrens 1930fa9e4066Sahrens maxlvl = dn->dn_phys->dn_nlevels; 1931fa9e4066Sahrens 1932fa9e4066Sahrens for (lvl = minlvl; lvl <= maxlvl; lvl++) { 19336754306eSahrens error = dnode_next_offset_level(dn, 1934cdb0ab79Smaybee flags, offset, lvl, blkfill, txg); 193598572ac1Sahrens if (error != ESRCH) 1936fa9e4066Sahrens break; 1937fa9e4066Sahrens } 1938fa9e4066Sahrens 1939cdb0ab79Smaybee while (error == 0 && --lvl >= minlvl) { 19406754306eSahrens error = dnode_next_offset_level(dn, 1941cdb0ab79Smaybee flags, offset, lvl, blkfill, txg); 19426754306eSahrens } 1943fa9e4066Sahrens 19440fbc0cd0SMatthew Ahrens /* 19450fbc0cd0SMatthew Ahrens * There's always a "virtual hole" at the end of the object, even 19460fbc0cd0SMatthew Ahrens * if all BP's which physically exist are non-holes. 19470fbc0cd0SMatthew Ahrens */ 19480fbc0cd0SMatthew Ahrens if ((flags & DNODE_FIND_HOLE) && error == ESRCH && txg == 0 && 19490fbc0cd0SMatthew Ahrens minlvl == 1 && blkfill == 1 && !(flags & DNODE_FIND_BACKWARDS)) { 19500fbc0cd0SMatthew Ahrens error = 0; 19510fbc0cd0SMatthew Ahrens } 19520fbc0cd0SMatthew Ahrens 1953cdb0ab79Smaybee if (error == 0 && (flags & DNODE_FIND_BACKWARDS ? 1954cdb0ab79Smaybee initial_offset < *offset : initial_offset > *offset)) 1955be6fd75aSMatthew Ahrens error = SET_ERROR(ESRCH); 1956cdb0ab79Smaybee out: 1957cdb0ab79Smaybee if (!(flags & DNODE_FIND_HAVELOCK)) 1958cdb0ab79Smaybee rw_exit(&dn->dn_struct_rwlock); 1959fa9e4066Sahrens 1960fa9e4066Sahrens return (error); 1961fa9e4066Sahrens } 1962