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 /* 22f65e61c0Sahrens * Copyright 2006 Sun Microsystems, Inc. All rights reserved. 23fa9e4066Sahrens * Use is subject to license terms. 24fa9e4066Sahrens */ 25fa9e4066Sahrens 26fa9e4066Sahrens #pragma ident "%Z%%M% %I% %E% SMI" 27fa9e4066Sahrens 28fa9e4066Sahrens 29fa9e4066Sahrens /* 30fa9e4066Sahrens * This file contains the top half of the zfs directory structure 31fa9e4066Sahrens * implementation. The bottom half is in zap_leaf.c. 32fa9e4066Sahrens * 33fa9e4066Sahrens * The zdir is an extendable hash data structure. There is a table of 34fa9e4066Sahrens * pointers to buckets (zap_t->zd_data->zd_leafs). The buckets are 35fa9e4066Sahrens * each a constant size and hold a variable number of directory entries. 36fa9e4066Sahrens * The buckets (aka "leaf nodes") are implemented in zap_leaf.c. 37fa9e4066Sahrens * 38fa9e4066Sahrens * The pointer table holds a power of 2 number of pointers. 39fa9e4066Sahrens * (1<<zap_t->zd_data->zd_phys->zd_prefix_len). The bucket pointed to 40fa9e4066Sahrens * by the pointer at index i in the table holds entries whose hash value 41fa9e4066Sahrens * has a zd_prefix_len - bit prefix 42fa9e4066Sahrens */ 43fa9e4066Sahrens 44fa9e4066Sahrens #include <sys/spa.h> 45fa9e4066Sahrens #include <sys/dmu.h> 46fa9e4066Sahrens #include <sys/zfs_context.h> 47fa9e4066Sahrens #include <sys/zap.h> 48*ea8dc4b6Seschrock #include <sys/refcount.h> 49fa9e4066Sahrens #include <sys/zap_impl.h> 50fa9e4066Sahrens #include <sys/zap_leaf.h> 51fa9e4066Sahrens 52f65e61c0Sahrens #define MIN_FREE(l) (ZAP_LEAF_NUMCHUNKS(l)*9/10) 53f65e61c0Sahrens 54f65e61c0Sahrens int fzap_default_block_shift = 14; /* 16k blocksize */ 55fa9e4066Sahrens 56fa9e4066Sahrens static void zap_grow_ptrtbl(zap_t *zap, dmu_tx_t *tx); 57fa9e4066Sahrens static int zap_tryupgradedir(zap_t *zap, dmu_tx_t *tx); 58*ea8dc4b6Seschrock static int zap_get_leaf_byblk(zap_t *zap, uint64_t blkid, 59*ea8dc4b6Seschrock dmu_tx_t *tx, krw_t lt, zap_leaf_t **lp); 60fa9e4066Sahrens static void zap_leaf_pageout(dmu_buf_t *db, void *vl); 61fa9e4066Sahrens 62fa9e4066Sahrens 63fa9e4066Sahrens void 64fa9e4066Sahrens fzap_byteswap(void *vbuf, size_t size) 65fa9e4066Sahrens { 66fa9e4066Sahrens uint64_t block_type; 67fa9e4066Sahrens 68fa9e4066Sahrens block_type = *(uint64_t *)vbuf; 69fa9e4066Sahrens 70fa9e4066Sahrens switch (block_type) { 71fa9e4066Sahrens case ZBT_LEAF: 72fa9e4066Sahrens case BSWAP_64(ZBT_LEAF): 73f65e61c0Sahrens zap_leaf_byteswap(vbuf, size); 74fa9e4066Sahrens return; 75fa9e4066Sahrens case ZBT_HEADER: 76fa9e4066Sahrens case BSWAP_64(ZBT_HEADER): 77fa9e4066Sahrens default: 78fa9e4066Sahrens /* it's a ptrtbl block */ 79f65e61c0Sahrens byteswap_uint64_array(vbuf, size); 80fa9e4066Sahrens return; 81fa9e4066Sahrens } 82fa9e4066Sahrens } 83fa9e4066Sahrens 84fa9e4066Sahrens void 85fa9e4066Sahrens fzap_upgrade(zap_t *zap, dmu_tx_t *tx) 86fa9e4066Sahrens { 87fa9e4066Sahrens dmu_buf_t *db; 88fa9e4066Sahrens zap_leaf_t *l; 89fa9e4066Sahrens int i; 90fa9e4066Sahrens zap_phys_t *zp; 91fa9e4066Sahrens 92fa9e4066Sahrens ASSERT(RW_WRITE_HELD(&zap->zap_rwlock)); 93fa9e4066Sahrens zap->zap_ismicro = FALSE; 94fa9e4066Sahrens 95fa9e4066Sahrens (void) dmu_buf_update_user(zap->zap_dbuf, zap, zap, 96fa9e4066Sahrens &zap->zap_f.zap_phys, zap_pageout); 97fa9e4066Sahrens 98fa9e4066Sahrens mutex_init(&zap->zap_f.zap_num_entries_mtx, 0, 0, 0); 99f65e61c0Sahrens zap->zap_f.zap_block_shift = highbit(zap->zap_dbuf->db_size) - 1; 100fa9e4066Sahrens 101fa9e4066Sahrens zp = zap->zap_f.zap_phys; 102fa9e4066Sahrens /* 103fa9e4066Sahrens * explicitly zero it since it might be coming from an 104fa9e4066Sahrens * initialized microzap 105fa9e4066Sahrens */ 106f65e61c0Sahrens bzero(zap->zap_dbuf->db_data, zap->zap_dbuf->db_size); 107fa9e4066Sahrens zp->zap_block_type = ZBT_HEADER; 108fa9e4066Sahrens zp->zap_magic = ZAP_MAGIC; 109fa9e4066Sahrens 110f65e61c0Sahrens zp->zap_ptrtbl.zt_shift = ZAP_EMBEDDED_PTRTBL_SHIFT(zap); 111fa9e4066Sahrens 112fa9e4066Sahrens zp->zap_freeblk = 2; /* block 1 will be the first leaf */ 113fa9e4066Sahrens zp->zap_num_leafs = 1; 114fa9e4066Sahrens zp->zap_num_entries = 0; 115fa9e4066Sahrens zp->zap_salt = zap->zap_salt; 116fa9e4066Sahrens 117f65e61c0Sahrens /* block 1 will be the first leaf */ 118f65e61c0Sahrens for (i = 0; i < (1<<zp->zap_ptrtbl.zt_shift); i++) 119f65e61c0Sahrens ZAP_EMBEDDED_PTRTBL_ENT(zap, i) = 1; 120fa9e4066Sahrens 121fa9e4066Sahrens /* 122fa9e4066Sahrens * set up block 1 - the first leaf 123fa9e4066Sahrens */ 124*ea8dc4b6Seschrock VERIFY(0 == dmu_buf_hold(zap->zap_objset, zap->zap_object, 125*ea8dc4b6Seschrock 1<<FZAP_BLOCK_SHIFT(zap), FTAG, &db)); 126fa9e4066Sahrens dmu_buf_will_dirty(db, tx); 127fa9e4066Sahrens 128fa9e4066Sahrens l = kmem_zalloc(sizeof (zap_leaf_t), KM_SLEEP); 129fa9e4066Sahrens l->l_dbuf = db; 130fa9e4066Sahrens l->l_phys = db->db_data; 131fa9e4066Sahrens 132fa9e4066Sahrens zap_leaf_init(l); 133fa9e4066Sahrens 134fa9e4066Sahrens kmem_free(l, sizeof (zap_leaf_t)); 135*ea8dc4b6Seschrock dmu_buf_rele(db, FTAG); 136fa9e4066Sahrens } 137fa9e4066Sahrens 138fa9e4066Sahrens static int 139fa9e4066Sahrens zap_tryupgradedir(zap_t *zap, dmu_tx_t *tx) 140fa9e4066Sahrens { 141fa9e4066Sahrens if (RW_WRITE_HELD(&zap->zap_rwlock)) 142fa9e4066Sahrens return (1); 143fa9e4066Sahrens if (rw_tryupgrade(&zap->zap_rwlock)) { 144fa9e4066Sahrens dmu_buf_will_dirty(zap->zap_dbuf, tx); 145fa9e4066Sahrens return (1); 146fa9e4066Sahrens } 147fa9e4066Sahrens return (0); 148fa9e4066Sahrens } 149fa9e4066Sahrens 150fa9e4066Sahrens /* 151fa9e4066Sahrens * Generic routines for dealing with the pointer & cookie tables. 152fa9e4066Sahrens */ 153fa9e4066Sahrens 154fa9e4066Sahrens static void 155fa9e4066Sahrens zap_table_grow(zap_t *zap, zap_table_phys_t *tbl, 156fa9e4066Sahrens void (*transfer_func)(const uint64_t *src, uint64_t *dst, int n), 157fa9e4066Sahrens dmu_tx_t *tx) 158fa9e4066Sahrens { 159fa9e4066Sahrens uint64_t b, newblk; 160fa9e4066Sahrens dmu_buf_t *db_old, *db_new; 161*ea8dc4b6Seschrock int err; 162f65e61c0Sahrens int bs = FZAP_BLOCK_SHIFT(zap); 163f65e61c0Sahrens int hepb = 1<<(bs-4); 164fa9e4066Sahrens /* hepb = half the number of entries in a block */ 165fa9e4066Sahrens 166fa9e4066Sahrens ASSERT(RW_WRITE_HELD(&zap->zap_rwlock)); 167fa9e4066Sahrens ASSERT(tbl->zt_blk != 0); 168fa9e4066Sahrens ASSERT(tbl->zt_numblks > 0); 169fa9e4066Sahrens 170fa9e4066Sahrens if (tbl->zt_nextblk != 0) { 171fa9e4066Sahrens newblk = tbl->zt_nextblk; 172fa9e4066Sahrens } else { 173fa9e4066Sahrens newblk = zap_allocate_blocks(zap, tbl->zt_numblks * 2, tx); 174fa9e4066Sahrens tbl->zt_nextblk = newblk; 175fa9e4066Sahrens ASSERT3U(tbl->zt_blks_copied, ==, 0); 176fa9e4066Sahrens dmu_prefetch(zap->zap_objset, zap->zap_object, 177f65e61c0Sahrens tbl->zt_blk << bs, tbl->zt_numblks << bs); 178fa9e4066Sahrens } 179fa9e4066Sahrens 180fa9e4066Sahrens /* 181fa9e4066Sahrens * Copy the ptrtbl from the old to new location, leaving the odd 182fa9e4066Sahrens * entries blank as we go. 183fa9e4066Sahrens */ 184fa9e4066Sahrens 185fa9e4066Sahrens b = tbl->zt_blks_copied; 186*ea8dc4b6Seschrock err = dmu_buf_hold(zap->zap_objset, zap->zap_object, 187*ea8dc4b6Seschrock (tbl->zt_blk + b) << bs, FTAG, &db_old); 188*ea8dc4b6Seschrock if (err) 189*ea8dc4b6Seschrock return; 190fa9e4066Sahrens 191fa9e4066Sahrens /* first half of entries in old[b] go to new[2*b+0] */ 192*ea8dc4b6Seschrock VERIFY(0 == dmu_buf_hold(zap->zap_objset, zap->zap_object, 193*ea8dc4b6Seschrock (newblk + 2*b+0) << bs, FTAG, &db_new)); 194fa9e4066Sahrens dmu_buf_will_dirty(db_new, tx); 195fa9e4066Sahrens transfer_func(db_old->db_data, db_new->db_data, hepb); 196*ea8dc4b6Seschrock dmu_buf_rele(db_new, FTAG); 197fa9e4066Sahrens 198fa9e4066Sahrens /* second half of entries in old[b] go to new[2*b+1] */ 199*ea8dc4b6Seschrock VERIFY(0 == dmu_buf_hold(zap->zap_objset, zap->zap_object, 200*ea8dc4b6Seschrock (newblk + 2*b+1) << bs, FTAG, &db_new)); 201fa9e4066Sahrens dmu_buf_will_dirty(db_new, tx); 202fa9e4066Sahrens transfer_func((uint64_t *)db_old->db_data + hepb, 203fa9e4066Sahrens db_new->db_data, hepb); 204*ea8dc4b6Seschrock dmu_buf_rele(db_new, FTAG); 205fa9e4066Sahrens 206*ea8dc4b6Seschrock dmu_buf_rele(db_old, FTAG); 207fa9e4066Sahrens 208fa9e4066Sahrens tbl->zt_blks_copied++; 209fa9e4066Sahrens 210fa9e4066Sahrens dprintf("copied block %llu of %llu\n", 211fa9e4066Sahrens tbl->zt_blks_copied, tbl->zt_numblks); 212fa9e4066Sahrens 213fa9e4066Sahrens if (tbl->zt_blks_copied == tbl->zt_numblks) { 214*ea8dc4b6Seschrock (void) dmu_free_range(zap->zap_objset, zap->zap_object, 215f65e61c0Sahrens tbl->zt_blk << bs, tbl->zt_numblks << bs, tx); 216fa9e4066Sahrens 217fa9e4066Sahrens tbl->zt_blk = newblk; 218fa9e4066Sahrens tbl->zt_numblks *= 2; 219fa9e4066Sahrens tbl->zt_shift++; 220fa9e4066Sahrens tbl->zt_nextblk = 0; 221fa9e4066Sahrens tbl->zt_blks_copied = 0; 222fa9e4066Sahrens 223fa9e4066Sahrens dprintf("finished; numblocks now %llu (%lluk entries)\n", 224fa9e4066Sahrens tbl->zt_numblks, 1<<(tbl->zt_shift-10)); 225fa9e4066Sahrens } 226fa9e4066Sahrens } 227fa9e4066Sahrens 228*ea8dc4b6Seschrock static int 229fa9e4066Sahrens zap_table_store(zap_t *zap, zap_table_phys_t *tbl, uint64_t idx, uint64_t val, 230fa9e4066Sahrens dmu_tx_t *tx) 231fa9e4066Sahrens { 232*ea8dc4b6Seschrock int err; 233*ea8dc4b6Seschrock uint64_t blk, off; 234f65e61c0Sahrens int bs = FZAP_BLOCK_SHIFT(zap); 235*ea8dc4b6Seschrock dmu_buf_t *db; 236fa9e4066Sahrens 237fa9e4066Sahrens ASSERT(RW_LOCK_HELD(&zap->zap_rwlock)); 238fa9e4066Sahrens ASSERT(tbl->zt_blk != 0); 239fa9e4066Sahrens 240fa9e4066Sahrens dprintf("storing %llx at index %llx\n", val, idx); 241fa9e4066Sahrens 242f65e61c0Sahrens blk = idx >> (bs-3); 243f65e61c0Sahrens off = idx & ((1<<(bs-3))-1); 244fa9e4066Sahrens 245*ea8dc4b6Seschrock err = dmu_buf_hold(zap->zap_objset, zap->zap_object, 246*ea8dc4b6Seschrock (tbl->zt_blk + blk) << bs, FTAG, &db); 247*ea8dc4b6Seschrock if (err) 248*ea8dc4b6Seschrock return (err); 249fa9e4066Sahrens dmu_buf_will_dirty(db, tx); 250fa9e4066Sahrens 251fa9e4066Sahrens if (tbl->zt_nextblk != 0) { 252*ea8dc4b6Seschrock uint64_t idx2 = idx * 2; 253*ea8dc4b6Seschrock uint64_t blk2 = idx2 >> (bs-3); 254*ea8dc4b6Seschrock uint64_t off2 = idx2 & ((1<<(bs-3))-1); 255*ea8dc4b6Seschrock dmu_buf_t *db2; 256*ea8dc4b6Seschrock 257*ea8dc4b6Seschrock err = dmu_buf_hold(zap->zap_objset, zap->zap_object, 258*ea8dc4b6Seschrock (tbl->zt_nextblk + blk2) << bs, FTAG, &db2); 259*ea8dc4b6Seschrock if (err) { 260*ea8dc4b6Seschrock dmu_buf_rele(db, FTAG); 261*ea8dc4b6Seschrock return (err); 262*ea8dc4b6Seschrock } 263*ea8dc4b6Seschrock dmu_buf_will_dirty(db2, tx); 264*ea8dc4b6Seschrock ((uint64_t *)db2->db_data)[off2] = val; 265*ea8dc4b6Seschrock ((uint64_t *)db2->db_data)[off2+1] = val; 266*ea8dc4b6Seschrock dmu_buf_rele(db2, FTAG); 267fa9e4066Sahrens } 268fa9e4066Sahrens 269*ea8dc4b6Seschrock ((uint64_t *)db->db_data)[off] = val; 270*ea8dc4b6Seschrock dmu_buf_rele(db, FTAG); 271*ea8dc4b6Seschrock 272*ea8dc4b6Seschrock return (0); 273fa9e4066Sahrens } 274fa9e4066Sahrens 275*ea8dc4b6Seschrock static int 276*ea8dc4b6Seschrock zap_table_load(zap_t *zap, zap_table_phys_t *tbl, uint64_t idx, uint64_t *valp) 277fa9e4066Sahrens { 278*ea8dc4b6Seschrock uint64_t blk, off; 279*ea8dc4b6Seschrock int err; 280fa9e4066Sahrens dmu_buf_t *db; 281f65e61c0Sahrens int bs = FZAP_BLOCK_SHIFT(zap); 282fa9e4066Sahrens 283fa9e4066Sahrens ASSERT(RW_LOCK_HELD(&zap->zap_rwlock)); 284fa9e4066Sahrens 285f65e61c0Sahrens blk = idx >> (bs-3); 286f65e61c0Sahrens off = idx & ((1<<(bs-3))-1); 287fa9e4066Sahrens 288*ea8dc4b6Seschrock err = dmu_buf_hold(zap->zap_objset, zap->zap_object, 289*ea8dc4b6Seschrock (tbl->zt_blk + blk) << bs, FTAG, &db); 290*ea8dc4b6Seschrock if (err) 291*ea8dc4b6Seschrock return (err); 292*ea8dc4b6Seschrock *valp = ((uint64_t *)db->db_data)[off]; 293*ea8dc4b6Seschrock dmu_buf_rele(db, FTAG); 294*ea8dc4b6Seschrock 295*ea8dc4b6Seschrock if (tbl->zt_nextblk != 0) { 296*ea8dc4b6Seschrock /* 297*ea8dc4b6Seschrock * read the nextblk for the sake of i/o error checking, 298*ea8dc4b6Seschrock * so that zap_table_load() will catch errors for 299*ea8dc4b6Seschrock * zap_table_store. 300*ea8dc4b6Seschrock */ 301*ea8dc4b6Seschrock blk = (idx*2) >> (bs-3); 302*ea8dc4b6Seschrock 303*ea8dc4b6Seschrock err = dmu_buf_hold(zap->zap_objset, zap->zap_object, 304*ea8dc4b6Seschrock (tbl->zt_nextblk + blk) << bs, FTAG, &db); 305*ea8dc4b6Seschrock dmu_buf_rele(db, FTAG); 306*ea8dc4b6Seschrock } 307*ea8dc4b6Seschrock return (err); 308fa9e4066Sahrens } 309fa9e4066Sahrens 310fa9e4066Sahrens /* 311fa9e4066Sahrens * Routines for growing the ptrtbl. 312fa9e4066Sahrens */ 313fa9e4066Sahrens 314fa9e4066Sahrens static void 315fa9e4066Sahrens zap_ptrtbl_transfer(const uint64_t *src, uint64_t *dst, int n) 316fa9e4066Sahrens { 317fa9e4066Sahrens int i; 318fa9e4066Sahrens for (i = 0; i < n; i++) { 319fa9e4066Sahrens uint64_t lb = src[i]; 320fa9e4066Sahrens dst[2*i+0] = lb; 321fa9e4066Sahrens dst[2*i+1] = lb; 322fa9e4066Sahrens } 323fa9e4066Sahrens } 324fa9e4066Sahrens 325fa9e4066Sahrens static void 326fa9e4066Sahrens zap_grow_ptrtbl(zap_t *zap, dmu_tx_t *tx) 327fa9e4066Sahrens { 328fa9e4066Sahrens if (zap->zap_f.zap_phys->zap_ptrtbl.zt_shift == 32) 329fa9e4066Sahrens return; 330fa9e4066Sahrens 331fa9e4066Sahrens if (zap->zap_f.zap_phys->zap_ptrtbl.zt_numblks == 0) { 332fa9e4066Sahrens /* 333f65e61c0Sahrens * We are outgrowing the "embedded" ptrtbl (the one 334f65e61c0Sahrens * stored in the header block). Give it its own entire 335f65e61c0Sahrens * block, which will double the size of the ptrtbl. 336fa9e4066Sahrens */ 337fa9e4066Sahrens uint64_t newblk; 338fa9e4066Sahrens dmu_buf_t *db_new; 339*ea8dc4b6Seschrock int err; 340fa9e4066Sahrens 341fa9e4066Sahrens ASSERT3U(zap->zap_f.zap_phys->zap_ptrtbl.zt_shift, ==, 342f65e61c0Sahrens ZAP_EMBEDDED_PTRTBL_SHIFT(zap)); 343fa9e4066Sahrens ASSERT3U(zap->zap_f.zap_phys->zap_ptrtbl.zt_blk, ==, 0); 344fa9e4066Sahrens 345fa9e4066Sahrens newblk = zap_allocate_blocks(zap, 1, tx); 346*ea8dc4b6Seschrock err = dmu_buf_hold(zap->zap_objset, zap->zap_object, 347*ea8dc4b6Seschrock newblk << FZAP_BLOCK_SHIFT(zap), FTAG, &db_new); 348*ea8dc4b6Seschrock if (err) 349*ea8dc4b6Seschrock return; 350fa9e4066Sahrens dmu_buf_will_dirty(db_new, tx); 351f65e61c0Sahrens zap_ptrtbl_transfer(&ZAP_EMBEDDED_PTRTBL_ENT(zap, 0), 352f65e61c0Sahrens db_new->db_data, 1 << ZAP_EMBEDDED_PTRTBL_SHIFT(zap)); 353*ea8dc4b6Seschrock dmu_buf_rele(db_new, FTAG); 354fa9e4066Sahrens 355fa9e4066Sahrens zap->zap_f.zap_phys->zap_ptrtbl.zt_blk = newblk; 356fa9e4066Sahrens zap->zap_f.zap_phys->zap_ptrtbl.zt_numblks = 1; 357fa9e4066Sahrens zap->zap_f.zap_phys->zap_ptrtbl.zt_shift++; 358fa9e4066Sahrens 359fa9e4066Sahrens ASSERT3U(1ULL << zap->zap_f.zap_phys->zap_ptrtbl.zt_shift, ==, 360fa9e4066Sahrens zap->zap_f.zap_phys->zap_ptrtbl.zt_numblks << 361f65e61c0Sahrens (FZAP_BLOCK_SHIFT(zap)-3)); 362fa9e4066Sahrens } else { 363fa9e4066Sahrens zap_table_grow(zap, &zap->zap_f.zap_phys->zap_ptrtbl, 364fa9e4066Sahrens zap_ptrtbl_transfer, tx); 365fa9e4066Sahrens } 366fa9e4066Sahrens } 367fa9e4066Sahrens 368fa9e4066Sahrens static void 369fa9e4066Sahrens zap_increment_num_entries(zap_t *zap, int delta, dmu_tx_t *tx) 370fa9e4066Sahrens { 371fa9e4066Sahrens dmu_buf_will_dirty(zap->zap_dbuf, tx); 372fa9e4066Sahrens mutex_enter(&zap->zap_f.zap_num_entries_mtx); 373fa9e4066Sahrens 374fa9e4066Sahrens ASSERT(delta > 0 || zap->zap_f.zap_phys->zap_num_entries >= -delta); 375fa9e4066Sahrens 376fa9e4066Sahrens zap->zap_f.zap_phys->zap_num_entries += delta; 377fa9e4066Sahrens 378fa9e4066Sahrens mutex_exit(&zap->zap_f.zap_num_entries_mtx); 379fa9e4066Sahrens } 380fa9e4066Sahrens 381fa9e4066Sahrens uint64_t 382fa9e4066Sahrens zap_allocate_blocks(zap_t *zap, int nblocks, dmu_tx_t *tx) 383fa9e4066Sahrens { 384fa9e4066Sahrens uint64_t newblk; 385fa9e4066Sahrens ASSERT(tx != NULL); 386fa9e4066Sahrens if (!RW_WRITE_HELD(&zap->zap_rwlock)) { 387fa9e4066Sahrens dmu_buf_will_dirty(zap->zap_dbuf, tx); 388fa9e4066Sahrens } 389fa9e4066Sahrens newblk = atomic_add_64_nv(&zap->zap_f.zap_phys->zap_freeblk, nblocks) - 390fa9e4066Sahrens nblocks; 391fa9e4066Sahrens return (newblk); 392fa9e4066Sahrens } 393fa9e4066Sahrens 394fa9e4066Sahrens 395fa9e4066Sahrens /* 396fa9e4066Sahrens * This function doesn't increment zap_num_leafs because it's used to 397fa9e4066Sahrens * allocate a leaf chain, which doesn't count against zap_num_leafs. 398fa9e4066Sahrens * The directory must be held exclusively for this tx. 399fa9e4066Sahrens */ 400fa9e4066Sahrens zap_leaf_t * 401fa9e4066Sahrens zap_create_leaf(zap_t *zap, dmu_tx_t *tx) 402fa9e4066Sahrens { 403fa9e4066Sahrens void *winner; 404fa9e4066Sahrens zap_leaf_t *l = kmem_alloc(sizeof (zap_leaf_t), KM_SLEEP); 405fa9e4066Sahrens 406fa9e4066Sahrens ASSERT(tx != NULL); 407fa9e4066Sahrens ASSERT(RW_WRITE_HELD(&zap->zap_rwlock)); 408fa9e4066Sahrens /* hence we already dirtied zap->zap_dbuf */ 409fa9e4066Sahrens 410fa9e4066Sahrens rw_init(&l->l_rwlock, 0, 0, 0); 411fa9e4066Sahrens rw_enter(&l->l_rwlock, RW_WRITER); 412fa9e4066Sahrens l->l_blkid = zap_allocate_blocks(zap, 1, tx); 413fa9e4066Sahrens l->l_next = NULL; 414fa9e4066Sahrens l->l_dbuf = NULL; 415fa9e4066Sahrens l->l_phys = NULL; 416fa9e4066Sahrens 417*ea8dc4b6Seschrock VERIFY(0 == dmu_buf_hold(zap->zap_objset, zap->zap_object, 418*ea8dc4b6Seschrock l->l_blkid << FZAP_BLOCK_SHIFT(zap), NULL, &l->l_dbuf)); 419fa9e4066Sahrens winner = dmu_buf_set_user(l->l_dbuf, l, &l->l_phys, zap_leaf_pageout); 420fa9e4066Sahrens ASSERT(winner == NULL); 421fa9e4066Sahrens dmu_buf_will_dirty(l->l_dbuf, tx); 422fa9e4066Sahrens 423fa9e4066Sahrens zap_leaf_init(l); 424fa9e4066Sahrens 425fa9e4066Sahrens return (l); 426fa9e4066Sahrens } 427fa9e4066Sahrens 428fa9e4066Sahrens /* ARGSUSED */ 429fa9e4066Sahrens void 430fa9e4066Sahrens zap_destroy_leaf(zap_t *zap, zap_leaf_t *l, dmu_tx_t *tx) 431fa9e4066Sahrens { 432fa9e4066Sahrens /* uint64_t offset = l->l_blkid << ZAP_BLOCK_SHIFT; */ 433fa9e4066Sahrens rw_exit(&l->l_rwlock); 434*ea8dc4b6Seschrock dmu_buf_rele(l->l_dbuf, NULL); 435fa9e4066Sahrens /* XXX there are still holds on this block, so we can't free it? */ 436fa9e4066Sahrens /* dmu_free_range(zap->zap_objset, zap->zap_object, */ 437fa9e4066Sahrens /* offset, 1<<ZAP_BLOCK_SHIFT, tx); */ 438fa9e4066Sahrens } 439fa9e4066Sahrens 440fa9e4066Sahrens int 441fa9e4066Sahrens fzap_count(zap_t *zap, uint64_t *count) 442fa9e4066Sahrens { 443fa9e4066Sahrens ASSERT(!zap->zap_ismicro); 444fa9e4066Sahrens mutex_enter(&zap->zap_f.zap_num_entries_mtx); /* unnecessary */ 445fa9e4066Sahrens *count = zap->zap_f.zap_phys->zap_num_entries; 446fa9e4066Sahrens mutex_exit(&zap->zap_f.zap_num_entries_mtx); 447fa9e4066Sahrens return (0); 448fa9e4066Sahrens } 449fa9e4066Sahrens 450fa9e4066Sahrens /* 451fa9e4066Sahrens * Routines for obtaining zap_leaf_t's 452fa9e4066Sahrens */ 453fa9e4066Sahrens 45487e5029aSahrens void 455fa9e4066Sahrens zap_put_leaf(zap_leaf_t *l) 456fa9e4066Sahrens { 457fa9e4066Sahrens zap_leaf_t *nl = l->l_next; 458fa9e4066Sahrens while (nl) { 459fa9e4066Sahrens zap_leaf_t *nnl = nl->l_next; 460fa9e4066Sahrens rw_exit(&nl->l_rwlock); 461*ea8dc4b6Seschrock dmu_buf_rele(nl->l_dbuf, NULL); 462fa9e4066Sahrens nl = nnl; 463fa9e4066Sahrens } 464fa9e4066Sahrens rw_exit(&l->l_rwlock); 465*ea8dc4b6Seschrock dmu_buf_rele(l->l_dbuf, NULL); 466fa9e4066Sahrens } 467fa9e4066Sahrens 468fa9e4066Sahrens _NOTE(ARGSUSED(0)) 469fa9e4066Sahrens static void 470fa9e4066Sahrens zap_leaf_pageout(dmu_buf_t *db, void *vl) 471fa9e4066Sahrens { 472fa9e4066Sahrens zap_leaf_t *l = vl; 473fa9e4066Sahrens 474fa9e4066Sahrens rw_destroy(&l->l_rwlock); 475fa9e4066Sahrens kmem_free(l, sizeof (zap_leaf_t)); 476fa9e4066Sahrens } 477fa9e4066Sahrens 478fa9e4066Sahrens static zap_leaf_t * 479fa9e4066Sahrens zap_open_leaf(uint64_t blkid, dmu_buf_t *db) 480fa9e4066Sahrens { 481fa9e4066Sahrens zap_leaf_t *l, *winner; 482fa9e4066Sahrens 483fa9e4066Sahrens ASSERT(blkid != 0); 484fa9e4066Sahrens 485fa9e4066Sahrens l = kmem_alloc(sizeof (zap_leaf_t), KM_SLEEP); 486fa9e4066Sahrens rw_init(&l->l_rwlock, 0, 0, 0); 487fa9e4066Sahrens rw_enter(&l->l_rwlock, RW_WRITER); 488fa9e4066Sahrens l->l_blkid = blkid; 489f65e61c0Sahrens l->l_bs = highbit(db->db_size)-1; 490fa9e4066Sahrens l->l_next = NULL; 491fa9e4066Sahrens l->l_dbuf = db; 492fa9e4066Sahrens l->l_phys = NULL; 493fa9e4066Sahrens 494fa9e4066Sahrens winner = dmu_buf_set_user(db, l, &l->l_phys, zap_leaf_pageout); 495fa9e4066Sahrens 496fa9e4066Sahrens rw_exit(&l->l_rwlock); 497fa9e4066Sahrens if (winner != NULL) { 498fa9e4066Sahrens /* someone else set it first */ 499fa9e4066Sahrens zap_leaf_pageout(NULL, l); 500fa9e4066Sahrens l = winner; 501fa9e4066Sahrens } 502fa9e4066Sahrens 503f65e61c0Sahrens /* 504f65e61c0Sahrens * There should be more hash entries than there can be 505f65e61c0Sahrens * chunks to put in the hash table 506f65e61c0Sahrens */ 507f65e61c0Sahrens ASSERT3U(ZAP_LEAF_HASH_NUMENTRIES(l), >, ZAP_LEAF_NUMCHUNKS(l) / 3); 508f65e61c0Sahrens 509f65e61c0Sahrens /* The chunks should begin at the end of the hash table */ 510f65e61c0Sahrens ASSERT3P(&ZAP_LEAF_CHUNK(l, 0), ==, 511f65e61c0Sahrens &l->l_phys->l_hash[ZAP_LEAF_HASH_NUMENTRIES(l)]); 512f65e61c0Sahrens 513f65e61c0Sahrens /* The chunks should end at the end of the block */ 514f65e61c0Sahrens ASSERT3U((uintptr_t)&ZAP_LEAF_CHUNK(l, ZAP_LEAF_NUMCHUNKS(l)) - 515f65e61c0Sahrens (uintptr_t)l->l_phys, ==, l->l_dbuf->db_size); 516f65e61c0Sahrens 517fa9e4066Sahrens return (l); 518fa9e4066Sahrens } 519fa9e4066Sahrens 520*ea8dc4b6Seschrock static int 521*ea8dc4b6Seschrock zap_get_leaf_byblk_impl(zap_t *zap, uint64_t blkid, dmu_tx_t *tx, krw_t lt, 522*ea8dc4b6Seschrock zap_leaf_t **lp) 523fa9e4066Sahrens { 524fa9e4066Sahrens dmu_buf_t *db; 525fa9e4066Sahrens zap_leaf_t *l; 526f65e61c0Sahrens int bs = FZAP_BLOCK_SHIFT(zap); 527*ea8dc4b6Seschrock int err; 528fa9e4066Sahrens 529fa9e4066Sahrens ASSERT(RW_LOCK_HELD(&zap->zap_rwlock)); 530fa9e4066Sahrens 531*ea8dc4b6Seschrock err = dmu_buf_hold(zap->zap_objset, zap->zap_object, 532*ea8dc4b6Seschrock blkid << bs, NULL, &db); 533*ea8dc4b6Seschrock if (err) 534*ea8dc4b6Seschrock return (err); 535fa9e4066Sahrens 536fa9e4066Sahrens ASSERT3U(db->db_object, ==, zap->zap_object); 537f65e61c0Sahrens ASSERT3U(db->db_offset, ==, blkid << bs); 538f65e61c0Sahrens ASSERT3U(db->db_size, ==, 1 << bs); 539fa9e4066Sahrens ASSERT(blkid != 0); 540fa9e4066Sahrens 541fa9e4066Sahrens l = dmu_buf_get_user(db); 542fa9e4066Sahrens 543fa9e4066Sahrens if (l == NULL) 544fa9e4066Sahrens l = zap_open_leaf(blkid, db); 545fa9e4066Sahrens 546fa9e4066Sahrens rw_enter(&l->l_rwlock, lt); 547fa9e4066Sahrens /* 548fa9e4066Sahrens * Must lock before dirtying, otherwise l->l_phys could change, 549fa9e4066Sahrens * causing ASSERT below to fail. 550fa9e4066Sahrens */ 551fa9e4066Sahrens if (lt == RW_WRITER) 552fa9e4066Sahrens dmu_buf_will_dirty(db, tx); 553fa9e4066Sahrens ASSERT3U(l->l_blkid, ==, blkid); 554fa9e4066Sahrens ASSERT3P(l->l_dbuf, ==, db); 555fa9e4066Sahrens ASSERT3P(l->l_phys, ==, l->l_dbuf->db_data); 556fa9e4066Sahrens ASSERT3U(l->lh_block_type, ==, ZBT_LEAF); 557fa9e4066Sahrens ASSERT3U(l->lh_magic, ==, ZAP_LEAF_MAGIC); 558fa9e4066Sahrens 559*ea8dc4b6Seschrock *lp = l; 560*ea8dc4b6Seschrock return (0); 561fa9e4066Sahrens } 562fa9e4066Sahrens 563*ea8dc4b6Seschrock static int 564*ea8dc4b6Seschrock zap_get_leaf_byblk(zap_t *zap, uint64_t blkid, dmu_tx_t *tx, krw_t lt, 565*ea8dc4b6Seschrock zap_leaf_t **lp) 566fa9e4066Sahrens { 567*ea8dc4b6Seschrock int err; 568*ea8dc4b6Seschrock zap_leaf_t *nl; 569fa9e4066Sahrens 570*ea8dc4b6Seschrock err = zap_get_leaf_byblk_impl(zap, blkid, tx, lt, lp); 571*ea8dc4b6Seschrock if (err) 572*ea8dc4b6Seschrock return (err); 573fa9e4066Sahrens 574*ea8dc4b6Seschrock nl = *lp; 575fa9e4066Sahrens while (nl->lh_next != 0) { 576fa9e4066Sahrens zap_leaf_t *nnl; 577*ea8dc4b6Seschrock err = zap_get_leaf_byblk_impl(zap, nl->lh_next, tx, lt, &nnl); 578*ea8dc4b6Seschrock if (err) { 579*ea8dc4b6Seschrock zap_put_leaf(*lp); 580*ea8dc4b6Seschrock return (err); 581*ea8dc4b6Seschrock } 582fa9e4066Sahrens nl->l_next = nnl; 583fa9e4066Sahrens nl = nnl; 584fa9e4066Sahrens } 585fa9e4066Sahrens 586*ea8dc4b6Seschrock return (err); 587fa9e4066Sahrens } 588fa9e4066Sahrens 589*ea8dc4b6Seschrock static int 590*ea8dc4b6Seschrock zap_idx_to_blk(zap_t *zap, uint64_t idx, uint64_t *valp) 591fa9e4066Sahrens { 592fa9e4066Sahrens ASSERT(RW_LOCK_HELD(&zap->zap_rwlock)); 593fa9e4066Sahrens 594fa9e4066Sahrens if (zap->zap_f.zap_phys->zap_ptrtbl.zt_numblks == 0) { 595fa9e4066Sahrens ASSERT3U(idx, <, 596fa9e4066Sahrens (1ULL << zap->zap_f.zap_phys->zap_ptrtbl.zt_shift)); 597*ea8dc4b6Seschrock *valp = ZAP_EMBEDDED_PTRTBL_ENT(zap, idx); 598*ea8dc4b6Seschrock return (0); 599fa9e4066Sahrens } else { 600fa9e4066Sahrens return (zap_table_load(zap, &zap->zap_f.zap_phys->zap_ptrtbl, 601*ea8dc4b6Seschrock idx, valp)); 602fa9e4066Sahrens } 603fa9e4066Sahrens } 604fa9e4066Sahrens 605*ea8dc4b6Seschrock static int 606fa9e4066Sahrens zap_set_idx_to_blk(zap_t *zap, uint64_t idx, uint64_t blk, dmu_tx_t *tx) 607fa9e4066Sahrens { 608fa9e4066Sahrens ASSERT(tx != NULL); 609fa9e4066Sahrens ASSERT(RW_WRITE_HELD(&zap->zap_rwlock)); 610fa9e4066Sahrens 611fa9e4066Sahrens if (zap->zap_f.zap_phys->zap_ptrtbl.zt_blk == 0) { 612f65e61c0Sahrens ZAP_EMBEDDED_PTRTBL_ENT(zap, idx) = blk; 613*ea8dc4b6Seschrock return (0); 614fa9e4066Sahrens } else { 615*ea8dc4b6Seschrock return (zap_table_store(zap, &zap->zap_f.zap_phys->zap_ptrtbl, 616*ea8dc4b6Seschrock idx, blk, tx)); 617fa9e4066Sahrens } 618fa9e4066Sahrens } 619fa9e4066Sahrens 620*ea8dc4b6Seschrock static int 621*ea8dc4b6Seschrock zap_deref_leaf(zap_t *zap, uint64_t h, dmu_tx_t *tx, krw_t lt, zap_leaf_t **lp) 622fa9e4066Sahrens { 623*ea8dc4b6Seschrock uint64_t idx, blk; 624*ea8dc4b6Seschrock int err; 625fa9e4066Sahrens 626fa9e4066Sahrens ASSERT(zap->zap_dbuf == NULL || 627fa9e4066Sahrens zap->zap_f.zap_phys == zap->zap_dbuf->db_data); 628fa9e4066Sahrens ASSERT3U(zap->zap_f.zap_phys->zap_magic, ==, ZAP_MAGIC); 629fa9e4066Sahrens idx = ZAP_HASH_IDX(h, zap->zap_f.zap_phys->zap_ptrtbl.zt_shift); 630*ea8dc4b6Seschrock err = zap_idx_to_blk(zap, idx, &blk); 631*ea8dc4b6Seschrock if (err != 0) 632*ea8dc4b6Seschrock return (err); 633*ea8dc4b6Seschrock err = zap_get_leaf_byblk(zap, blk, tx, lt, lp); 634fa9e4066Sahrens 635*ea8dc4b6Seschrock ASSERT(err || 636*ea8dc4b6Seschrock ZAP_HASH_IDX(h, (*lp)->lh_prefix_len) == (*lp)->lh_prefix); 637*ea8dc4b6Seschrock return (err); 638fa9e4066Sahrens } 639fa9e4066Sahrens 640fa9e4066Sahrens 641*ea8dc4b6Seschrock static int 642*ea8dc4b6Seschrock zap_expand_leaf(zap_t *zap, zap_leaf_t *l, uint64_t hash, dmu_tx_t *tx, 643*ea8dc4b6Seschrock zap_leaf_t **lp) 644fa9e4066Sahrens { 645fa9e4066Sahrens zap_leaf_t *nl; 646fa9e4066Sahrens int prefix_diff, i, err; 647fa9e4066Sahrens uint64_t sibling; 648fa9e4066Sahrens 649fa9e4066Sahrens ASSERT3U(l->lh_prefix_len, <=, 650fa9e4066Sahrens zap->zap_f.zap_phys->zap_ptrtbl.zt_shift); 651fa9e4066Sahrens ASSERT(RW_LOCK_HELD(&zap->zap_rwlock)); 652fa9e4066Sahrens 653fa9e4066Sahrens ASSERT3U(ZAP_HASH_IDX(hash, l->lh_prefix_len), ==, l->lh_prefix); 654fa9e4066Sahrens 655fa9e4066Sahrens if (zap_tryupgradedir(zap, tx) == 0) { 656fa9e4066Sahrens /* failed to upgrade */ 657fa9e4066Sahrens int old_prefix_len = l->lh_prefix_len; 658fa9e4066Sahrens objset_t *os = zap->zap_objset; 659fa9e4066Sahrens uint64_t object = zap->zap_object; 660fa9e4066Sahrens 661fa9e4066Sahrens zap_put_leaf(l); 662fa9e4066Sahrens zap_unlockdir(zap); 663fa9e4066Sahrens err = zap_lockdir(os, object, tx, RW_WRITER, FALSE, &zap); 664fa9e4066Sahrens ASSERT3U(err, ==, 0); 665fa9e4066Sahrens ASSERT(!zap->zap_ismicro); 666*ea8dc4b6Seschrock (void) zap_deref_leaf(zap, hash, tx, RW_WRITER, &l); 667fa9e4066Sahrens 668*ea8dc4b6Seschrock if (l->lh_prefix_len != old_prefix_len) { 669fa9e4066Sahrens /* it split while our locks were down */ 670*ea8dc4b6Seschrock *lp = l; 671*ea8dc4b6Seschrock return (0); 672*ea8dc4b6Seschrock } 673fa9e4066Sahrens } 674fa9e4066Sahrens ASSERT(RW_WRITE_HELD(&zap->zap_rwlock)); 675fa9e4066Sahrens 676fa9e4066Sahrens if (l->lh_prefix_len == zap->zap_f.zap_phys->zap_ptrtbl.zt_shift) { 677fa9e4066Sahrens /* There's only one pointer to us. Chain on another leaf blk. */ 678fa9e4066Sahrens (void) zap_leaf_chainmore(l, zap_create_leaf(zap, tx)); 679fa9e4066Sahrens dprintf("chaining leaf %x/%d\n", l->lh_prefix, 680fa9e4066Sahrens l->lh_prefix_len); 681*ea8dc4b6Seschrock *lp = l; 682*ea8dc4b6Seschrock return (0); 683fa9e4066Sahrens } 684fa9e4066Sahrens 685fa9e4066Sahrens ASSERT3U(ZAP_HASH_IDX(hash, l->lh_prefix_len), ==, l->lh_prefix); 686fa9e4066Sahrens 687fa9e4066Sahrens /* There's more than one pointer to us. Split this leaf. */ 688fa9e4066Sahrens 689fa9e4066Sahrens /* set sibling pointers */ 690fa9e4066Sahrens prefix_diff = 691*ea8dc4b6Seschrock zap->zap_f.zap_phys->zap_ptrtbl.zt_shift - (l->lh_prefix_len + 1); 692*ea8dc4b6Seschrock sibling = (ZAP_HASH_IDX(hash, l->lh_prefix_len + 1) | 1) << prefix_diff; 693*ea8dc4b6Seschrock 694*ea8dc4b6Seschrock /* check for i/o errors before doing zap_leaf_split */ 695fa9e4066Sahrens for (i = 0; i < (1ULL<<prefix_diff); i++) { 696*ea8dc4b6Seschrock uint64_t blk; 697*ea8dc4b6Seschrock err = zap_idx_to_blk(zap, sibling+i, &blk); 698*ea8dc4b6Seschrock if (err) 699*ea8dc4b6Seschrock return (err); 700*ea8dc4b6Seschrock ASSERT3U(blk, ==, l->l_blkid); 701*ea8dc4b6Seschrock } 702*ea8dc4b6Seschrock 703*ea8dc4b6Seschrock nl = zap_leaf_split(zap, l, tx); 704*ea8dc4b6Seschrock 705*ea8dc4b6Seschrock for (i = 0; i < (1ULL<<prefix_diff); i++) { 706*ea8dc4b6Seschrock err = zap_set_idx_to_blk(zap, sibling+i, nl->l_blkid, tx); 707*ea8dc4b6Seschrock ASSERT3U(err, ==, 0); /* we checked for i/o errors above */ 708fa9e4066Sahrens /* dprintf("set %d to %u %x\n", sibling+i, nl->l_blkid, nl); */ 709fa9e4066Sahrens } 710fa9e4066Sahrens 711fa9e4066Sahrens zap->zap_f.zap_phys->zap_num_leafs++; 712fa9e4066Sahrens 713fa9e4066Sahrens if (hash & (1ULL << (64 - l->lh_prefix_len))) { 714fa9e4066Sahrens /* we want the sibling */ 715fa9e4066Sahrens zap_put_leaf(l); 716fa9e4066Sahrens l = nl; 717fa9e4066Sahrens } else { 718fa9e4066Sahrens zap_put_leaf(nl); 719fa9e4066Sahrens } 720fa9e4066Sahrens 721*ea8dc4b6Seschrock *lp = l; 722*ea8dc4b6Seschrock return (0); 723fa9e4066Sahrens } 724fa9e4066Sahrens 725fa9e4066Sahrens static void 726f65e61c0Sahrens zap_put_leaf_maybe_grow_ptrtbl(zap_t *zap, zap_leaf_t *l, dmu_tx_t *tx) 727fa9e4066Sahrens { 728fa9e4066Sahrens int shift, err; 729fa9e4066Sahrens 730fa9e4066Sahrens again: 731fa9e4066Sahrens shift = zap->zap_f.zap_phys->zap_ptrtbl.zt_shift; 732fa9e4066Sahrens 733fa9e4066Sahrens if (l->lh_prefix_len == shift && 734f65e61c0Sahrens (l->l_next != NULL || l->lh_nfree < MIN_FREE(l))) { 735fa9e4066Sahrens /* this leaf will soon make us grow the pointer table */ 736fa9e4066Sahrens 737fa9e4066Sahrens if (zap_tryupgradedir(zap, tx) == 0) { 738fa9e4066Sahrens objset_t *os = zap->zap_objset; 739fa9e4066Sahrens uint64_t zapobj = zap->zap_object; 740fa9e4066Sahrens uint64_t blkid = l->l_blkid; 741fa9e4066Sahrens 742fa9e4066Sahrens zap_put_leaf(l); 743fa9e4066Sahrens zap_unlockdir(zap); 744fa9e4066Sahrens err = zap_lockdir(os, zapobj, tx, 745fa9e4066Sahrens RW_WRITER, FALSE, &zap); 746fa9e4066Sahrens ASSERT3U(err, ==, 0); 747*ea8dc4b6Seschrock (void) zap_get_leaf_byblk(zap, blkid, tx, 748*ea8dc4b6Seschrock RW_READER, &l); 749fa9e4066Sahrens goto again; 750fa9e4066Sahrens } 751fa9e4066Sahrens 752fa9e4066Sahrens zap_put_leaf(l); 753fa9e4066Sahrens zap_grow_ptrtbl(zap, tx); 754fa9e4066Sahrens } else { 755fa9e4066Sahrens zap_put_leaf(l); 756fa9e4066Sahrens } 757fa9e4066Sahrens } 758fa9e4066Sahrens 759fa9e4066Sahrens 760fa9e4066Sahrens static int 761fa9e4066Sahrens fzap_checksize(uint64_t integer_size, uint64_t num_integers) 762fa9e4066Sahrens { 763fa9e4066Sahrens /* Only integer sizes supported by C */ 764fa9e4066Sahrens switch (integer_size) { 765fa9e4066Sahrens case 1: 766fa9e4066Sahrens case 2: 767fa9e4066Sahrens case 4: 768fa9e4066Sahrens case 8: 769fa9e4066Sahrens break; 770fa9e4066Sahrens default: 771fa9e4066Sahrens return (EINVAL); 772fa9e4066Sahrens } 773fa9e4066Sahrens 774fa9e4066Sahrens /* Make sure we won't overflow */ 775fa9e4066Sahrens if (integer_size * num_integers < num_integers) 776fa9e4066Sahrens return (EINVAL); 777f65e61c0Sahrens if (integer_size * num_integers > (1<<fzap_default_block_shift)) 778fa9e4066Sahrens return (EINVAL); 779fa9e4066Sahrens 780fa9e4066Sahrens return (0); 781fa9e4066Sahrens } 782fa9e4066Sahrens 783fa9e4066Sahrens /* 784fa9e4066Sahrens * Routines for maniplulating attributes. 785fa9e4066Sahrens */ 786fa9e4066Sahrens int 787fa9e4066Sahrens fzap_lookup(zap_t *zap, const char *name, 788fa9e4066Sahrens uint64_t integer_size, uint64_t num_integers, void *buf) 789fa9e4066Sahrens { 790fa9e4066Sahrens zap_leaf_t *l; 791fa9e4066Sahrens int err; 792fa9e4066Sahrens uint64_t hash; 793fa9e4066Sahrens zap_entry_handle_t zeh; 794fa9e4066Sahrens 795fa9e4066Sahrens err = fzap_checksize(integer_size, num_integers); 796fa9e4066Sahrens if (err != 0) 797fa9e4066Sahrens return (err); 798fa9e4066Sahrens 799fa9e4066Sahrens hash = zap_hash(zap, name); 800*ea8dc4b6Seschrock err = zap_deref_leaf(zap, hash, NULL, RW_READER, &l); 801*ea8dc4b6Seschrock if (err != 0) 802*ea8dc4b6Seschrock return (err); 803fa9e4066Sahrens err = zap_leaf_lookup(l, name, hash, &zeh); 804fa9e4066Sahrens if (err != 0) 805fa9e4066Sahrens goto out; 806fa9e4066Sahrens err = zap_entry_read(&zeh, integer_size, num_integers, buf); 807fa9e4066Sahrens out: 808fa9e4066Sahrens zap_put_leaf(l); 809fa9e4066Sahrens return (err); 810fa9e4066Sahrens } 811fa9e4066Sahrens 812fa9e4066Sahrens int 813fa9e4066Sahrens fzap_add_cd(zap_t *zap, const char *name, 814fa9e4066Sahrens uint64_t integer_size, uint64_t num_integers, 815*ea8dc4b6Seschrock const void *val, uint32_t cd, dmu_tx_t *tx) 816fa9e4066Sahrens { 817fa9e4066Sahrens zap_leaf_t *l; 818fa9e4066Sahrens uint64_t hash; 819fa9e4066Sahrens int err; 820fa9e4066Sahrens zap_entry_handle_t zeh; 821fa9e4066Sahrens 822fa9e4066Sahrens ASSERT(RW_LOCK_HELD(&zap->zap_rwlock)); 823fa9e4066Sahrens ASSERT(!zap->zap_ismicro); 824fa9e4066Sahrens ASSERT(fzap_checksize(integer_size, num_integers) == 0); 825fa9e4066Sahrens 826fa9e4066Sahrens hash = zap_hash(zap, name); 827*ea8dc4b6Seschrock err = zap_deref_leaf(zap, hash, tx, RW_WRITER, &l); 828*ea8dc4b6Seschrock if (err != 0) 829*ea8dc4b6Seschrock return (err); 830fa9e4066Sahrens retry: 831fa9e4066Sahrens err = zap_leaf_lookup(l, name, hash, &zeh); 832fa9e4066Sahrens if (err == 0) { 833fa9e4066Sahrens err = EEXIST; 834fa9e4066Sahrens goto out; 835fa9e4066Sahrens } 836*ea8dc4b6Seschrock if (err != ENOENT) 837*ea8dc4b6Seschrock goto out; 838fa9e4066Sahrens 839fa9e4066Sahrens /* XXX If this leaf is chained, split it if we can. */ 840fa9e4066Sahrens err = zap_entry_create(l, name, hash, cd, 841fa9e4066Sahrens integer_size, num_integers, val, &zeh); 842fa9e4066Sahrens 843fa9e4066Sahrens if (err == 0) { 844fa9e4066Sahrens zap_increment_num_entries(zap, 1, tx); 845fa9e4066Sahrens } else if (err == EAGAIN) { 846*ea8dc4b6Seschrock err = zap_expand_leaf(zap, l, hash, tx, &l); 847*ea8dc4b6Seschrock if (err != 0) 848*ea8dc4b6Seschrock goto out; 849fa9e4066Sahrens goto retry; 850fa9e4066Sahrens } 851fa9e4066Sahrens 852fa9e4066Sahrens out: 853*ea8dc4b6Seschrock zap_put_leaf_maybe_grow_ptrtbl(zap, l, tx); 854fa9e4066Sahrens return (err); 855fa9e4066Sahrens } 856fa9e4066Sahrens 857fa9e4066Sahrens int 858fa9e4066Sahrens fzap_add(zap_t *zap, const char *name, 859fa9e4066Sahrens uint64_t integer_size, uint64_t num_integers, 860fa9e4066Sahrens const void *val, dmu_tx_t *tx) 861fa9e4066Sahrens { 862fa9e4066Sahrens int err; 863fa9e4066Sahrens 864fa9e4066Sahrens err = fzap_checksize(integer_size, num_integers); 865fa9e4066Sahrens if (err != 0) 866fa9e4066Sahrens return (err); 867fa9e4066Sahrens 868fa9e4066Sahrens err = fzap_add_cd(zap, name, integer_size, num_integers, 869*ea8dc4b6Seschrock val, ZAP_MAXCD, tx); 870fa9e4066Sahrens 871fa9e4066Sahrens return (err); 872fa9e4066Sahrens } 873fa9e4066Sahrens 874fa9e4066Sahrens int 875fa9e4066Sahrens fzap_update(zap_t *zap, const char *name, 876fa9e4066Sahrens int integer_size, uint64_t num_integers, const void *val, dmu_tx_t *tx) 877fa9e4066Sahrens { 878fa9e4066Sahrens zap_leaf_t *l; 879fa9e4066Sahrens uint64_t hash; 880fa9e4066Sahrens int err, create; 881fa9e4066Sahrens zap_entry_handle_t zeh; 882fa9e4066Sahrens 883fa9e4066Sahrens ASSERT(RW_LOCK_HELD(&zap->zap_rwlock)); 884fa9e4066Sahrens err = fzap_checksize(integer_size, num_integers); 885fa9e4066Sahrens if (err != 0) 886fa9e4066Sahrens return (err); 887fa9e4066Sahrens 888fa9e4066Sahrens hash = zap_hash(zap, name); 889*ea8dc4b6Seschrock err = zap_deref_leaf(zap, hash, tx, RW_WRITER, &l); 890*ea8dc4b6Seschrock if (err != 0) 891*ea8dc4b6Seschrock return (err); 892fa9e4066Sahrens retry: 893fa9e4066Sahrens err = zap_leaf_lookup(l, name, hash, &zeh); 894fa9e4066Sahrens create = (err == ENOENT); 895fa9e4066Sahrens ASSERT(err == 0 || err == ENOENT); 896fa9e4066Sahrens 897fa9e4066Sahrens /* XXX If this leaf is chained, split it if we can. */ 898fa9e4066Sahrens 899fa9e4066Sahrens if (create) { 900fa9e4066Sahrens err = zap_entry_create(l, name, hash, ZAP_MAXCD, 901fa9e4066Sahrens integer_size, num_integers, val, &zeh); 902fa9e4066Sahrens if (err == 0) 903fa9e4066Sahrens zap_increment_num_entries(zap, 1, tx); 904fa9e4066Sahrens } else { 905fa9e4066Sahrens err = zap_entry_update(&zeh, integer_size, num_integers, val); 906fa9e4066Sahrens } 907fa9e4066Sahrens 908fa9e4066Sahrens if (err == EAGAIN) { 909*ea8dc4b6Seschrock err = zap_expand_leaf(zap, l, hash, tx, &l); 910*ea8dc4b6Seschrock if (err != 0) 911*ea8dc4b6Seschrock goto out; 912fa9e4066Sahrens goto retry; 913fa9e4066Sahrens } 914fa9e4066Sahrens 915*ea8dc4b6Seschrock out: 916fa9e4066Sahrens zap_put_leaf_maybe_grow_ptrtbl(zap, l, tx); 917fa9e4066Sahrens return (err); 918fa9e4066Sahrens } 919fa9e4066Sahrens 920fa9e4066Sahrens int 921fa9e4066Sahrens fzap_length(zap_t *zap, const char *name, 922fa9e4066Sahrens uint64_t *integer_size, uint64_t *num_integers) 923fa9e4066Sahrens { 924fa9e4066Sahrens zap_leaf_t *l; 925fa9e4066Sahrens int err; 926fa9e4066Sahrens uint64_t hash; 927fa9e4066Sahrens zap_entry_handle_t zeh; 928fa9e4066Sahrens 929fa9e4066Sahrens hash = zap_hash(zap, name); 930*ea8dc4b6Seschrock err = zap_deref_leaf(zap, hash, NULL, RW_READER, &l); 931*ea8dc4b6Seschrock if (err != 0) 932*ea8dc4b6Seschrock return (err); 933fa9e4066Sahrens err = zap_leaf_lookup(l, name, hash, &zeh); 934fa9e4066Sahrens if (err != 0) 935fa9e4066Sahrens goto out; 936fa9e4066Sahrens 937fa9e4066Sahrens if (integer_size) 938fa9e4066Sahrens *integer_size = zeh.zeh_integer_size; 939fa9e4066Sahrens if (num_integers) 940fa9e4066Sahrens *num_integers = zeh.zeh_num_integers; 941fa9e4066Sahrens out: 942fa9e4066Sahrens zap_put_leaf(l); 943fa9e4066Sahrens return (err); 944fa9e4066Sahrens } 945fa9e4066Sahrens 946fa9e4066Sahrens int 947fa9e4066Sahrens fzap_remove(zap_t *zap, const char *name, dmu_tx_t *tx) 948fa9e4066Sahrens { 949fa9e4066Sahrens zap_leaf_t *l; 950fa9e4066Sahrens uint64_t hash; 951fa9e4066Sahrens int err; 952fa9e4066Sahrens zap_entry_handle_t zeh; 953fa9e4066Sahrens 954fa9e4066Sahrens hash = zap_hash(zap, name); 955*ea8dc4b6Seschrock err = zap_deref_leaf(zap, hash, tx, RW_WRITER, &l); 956*ea8dc4b6Seschrock if (err != 0) 957*ea8dc4b6Seschrock return (err); 958fa9e4066Sahrens err = zap_leaf_lookup(l, name, hash, &zeh); 959fa9e4066Sahrens if (err == 0) { 960fa9e4066Sahrens zap_entry_remove(&zeh); 961fa9e4066Sahrens zap_increment_num_entries(zap, -1, tx); 962fa9e4066Sahrens } 963fa9e4066Sahrens zap_put_leaf(l); 964fa9e4066Sahrens dprintf("fzap_remove: ds=%p obj=%llu name=%s err=%d\n", 965fa9e4066Sahrens zap->zap_objset, zap->zap_object, name, err); 966fa9e4066Sahrens return (err); 967fa9e4066Sahrens } 968fa9e4066Sahrens 969fa9e4066Sahrens int 970fa9e4066Sahrens zap_value_search(objset_t *os, uint64_t zapobj, uint64_t value, char *name) 971fa9e4066Sahrens { 972fa9e4066Sahrens zap_cursor_t zc; 973fa9e4066Sahrens zap_attribute_t *za; 974fa9e4066Sahrens int err; 975fa9e4066Sahrens 976fa9e4066Sahrens za = kmem_alloc(sizeof (zap_attribute_t), KM_SLEEP); 977fa9e4066Sahrens for (zap_cursor_init(&zc, os, zapobj); 978fa9e4066Sahrens (err = zap_cursor_retrieve(&zc, za)) == 0; 979fa9e4066Sahrens zap_cursor_advance(&zc)) { 980fa9e4066Sahrens if (za->za_first_integer == value) { 981fa9e4066Sahrens (void) strcpy(name, za->za_name); 982fa9e4066Sahrens break; 983fa9e4066Sahrens } 984fa9e4066Sahrens } 98587e5029aSahrens zap_cursor_fini(&zc); 986fa9e4066Sahrens kmem_free(za, sizeof (zap_attribute_t)); 987fa9e4066Sahrens return (err); 988fa9e4066Sahrens } 989fa9e4066Sahrens 990fa9e4066Sahrens 991fa9e4066Sahrens /* 992fa9e4066Sahrens * Routines for iterating over the attributes. 993fa9e4066Sahrens */ 994fa9e4066Sahrens 995fa9e4066Sahrens int 996fa9e4066Sahrens fzap_cursor_retrieve(zap_t *zap, zap_cursor_t *zc, zap_attribute_t *za) 997fa9e4066Sahrens { 998fa9e4066Sahrens int err = ENOENT; 999fa9e4066Sahrens zap_entry_handle_t zeh; 1000fa9e4066Sahrens zap_leaf_t *l; 1001fa9e4066Sahrens 1002fa9e4066Sahrens /* retrieve the next entry at or after zc_hash/zc_cd */ 1003fa9e4066Sahrens /* if no entry, return ENOENT */ 1004fa9e4066Sahrens 100587e5029aSahrens if (zc->zc_leaf && 100687e5029aSahrens (ZAP_HASH_IDX(zc->zc_hash, zc->zc_leaf->lh_prefix_len) != 100787e5029aSahrens zc->zc_leaf->lh_prefix)) { 100887e5029aSahrens rw_enter(&zc->zc_leaf->l_rwlock, RW_READER); 100987e5029aSahrens zap_put_leaf(zc->zc_leaf); 101087e5029aSahrens zc->zc_leaf = NULL; 101187e5029aSahrens } 101287e5029aSahrens 1013fa9e4066Sahrens again: 101487e5029aSahrens if (zc->zc_leaf == NULL) { 1015*ea8dc4b6Seschrock err = zap_deref_leaf(zap, zc->zc_hash, NULL, RW_READER, 1016*ea8dc4b6Seschrock &zc->zc_leaf); 1017*ea8dc4b6Seschrock if (err != 0) 1018*ea8dc4b6Seschrock return (err); 101987e5029aSahrens } else { 102087e5029aSahrens rw_enter(&zc->zc_leaf->l_rwlock, RW_READER); 102187e5029aSahrens } 102287e5029aSahrens l = zc->zc_leaf; 102387e5029aSahrens 1024fa9e4066Sahrens err = zap_leaf_lookup_closest(l, zc->zc_hash, zc->zc_cd, &zeh); 1025fa9e4066Sahrens 1026fa9e4066Sahrens if (err == ENOENT) { 1027fa9e4066Sahrens uint64_t nocare = (1ULL << (64 - l->lh_prefix_len)) - 1; 1028fa9e4066Sahrens zc->zc_hash = (zc->zc_hash & ~nocare) + nocare + 1; 1029fa9e4066Sahrens zc->zc_cd = 0; 1030fa9e4066Sahrens if (l->lh_prefix_len == 0 || zc->zc_hash == 0) { 1031fa9e4066Sahrens zc->zc_hash = -1ULL; 1032fa9e4066Sahrens } else { 103387e5029aSahrens zap_put_leaf(zc->zc_leaf); 103487e5029aSahrens zc->zc_leaf = NULL; 1035fa9e4066Sahrens goto again; 1036fa9e4066Sahrens } 1037fa9e4066Sahrens } 1038fa9e4066Sahrens 1039fa9e4066Sahrens if (err == 0) { 1040fa9e4066Sahrens zc->zc_hash = zeh.zeh_hash; 1041fa9e4066Sahrens zc->zc_cd = zeh.zeh_cd; 1042fa9e4066Sahrens za->za_integer_length = zeh.zeh_integer_size; 1043fa9e4066Sahrens za->za_num_integers = zeh.zeh_num_integers; 1044fa9e4066Sahrens if (zeh.zeh_num_integers == 0) { 1045fa9e4066Sahrens za->za_first_integer = 0; 1046fa9e4066Sahrens } else { 1047fa9e4066Sahrens err = zap_entry_read(&zeh, 8, 1, &za->za_first_integer); 1048fa9e4066Sahrens ASSERT(err == 0 || err == EOVERFLOW); 1049fa9e4066Sahrens } 1050fa9e4066Sahrens err = zap_entry_read_name(&zeh, 1051fa9e4066Sahrens sizeof (za->za_name), za->za_name); 1052fa9e4066Sahrens ASSERT(err == 0); 1053fa9e4066Sahrens } 105487e5029aSahrens rw_exit(&zc->zc_leaf->l_rwlock); 1055fa9e4066Sahrens return (err); 1056fa9e4066Sahrens } 1057fa9e4066Sahrens 1058fa9e4066Sahrens 1059fa9e4066Sahrens static void 1060fa9e4066Sahrens zap_stats_ptrtbl(zap_t *zap, uint64_t *tbl, int len, zap_stats_t *zs) 1061fa9e4066Sahrens { 1062*ea8dc4b6Seschrock int i, err; 1063fa9e4066Sahrens uint64_t lastblk = 0; 1064fa9e4066Sahrens 1065fa9e4066Sahrens /* 1066fa9e4066Sahrens * NB: if a leaf has more pointers than an entire ptrtbl block 1067fa9e4066Sahrens * can hold, then it'll be accounted for more than once, since 1068fa9e4066Sahrens * we won't have lastblk. 1069fa9e4066Sahrens */ 1070fa9e4066Sahrens for (i = 0; i < len; i++) { 1071fa9e4066Sahrens zap_leaf_t *l; 1072fa9e4066Sahrens 1073fa9e4066Sahrens if (tbl[i] == lastblk) 1074fa9e4066Sahrens continue; 1075fa9e4066Sahrens lastblk = tbl[i]; 1076fa9e4066Sahrens 1077*ea8dc4b6Seschrock err = zap_get_leaf_byblk(zap, tbl[i], NULL, RW_READER, &l); 1078*ea8dc4b6Seschrock if (err == 0) { 1079*ea8dc4b6Seschrock zap_stats_leaf(zap, l, zs); 1080*ea8dc4b6Seschrock zap_put_leaf(l); 1081*ea8dc4b6Seschrock } 1082fa9e4066Sahrens } 1083fa9e4066Sahrens } 1084fa9e4066Sahrens 1085fa9e4066Sahrens void 1086fa9e4066Sahrens fzap_get_stats(zap_t *zap, zap_stats_t *zs) 1087fa9e4066Sahrens { 1088f65e61c0Sahrens int bs = FZAP_BLOCK_SHIFT(zap); 1089fa9e4066Sahrens zs->zs_ptrtbl_len = 1ULL << zap->zap_f.zap_phys->zap_ptrtbl.zt_shift; 1090f65e61c0Sahrens zs->zs_blocksize = 1ULL << bs; 1091fa9e4066Sahrens zs->zs_num_leafs = zap->zap_f.zap_phys->zap_num_leafs; 1092fa9e4066Sahrens zs->zs_num_entries = zap->zap_f.zap_phys->zap_num_entries; 1093fa9e4066Sahrens zs->zs_num_blocks = zap->zap_f.zap_phys->zap_freeblk; 1094fa9e4066Sahrens 1095fa9e4066Sahrens if (zap->zap_f.zap_phys->zap_ptrtbl.zt_numblks == 0) { 1096fa9e4066Sahrens /* the ptrtbl is entirely in the header block. */ 1097f65e61c0Sahrens zap_stats_ptrtbl(zap, &ZAP_EMBEDDED_PTRTBL_ENT(zap, 0), 1098f65e61c0Sahrens 1 << ZAP_EMBEDDED_PTRTBL_SHIFT(zap), zs); 1099fa9e4066Sahrens } else { 1100fa9e4066Sahrens int b; 1101fa9e4066Sahrens 1102fa9e4066Sahrens dmu_prefetch(zap->zap_objset, zap->zap_object, 1103f65e61c0Sahrens zap->zap_f.zap_phys->zap_ptrtbl.zt_blk << bs, 1104f65e61c0Sahrens zap->zap_f.zap_phys->zap_ptrtbl.zt_numblks << bs); 1105fa9e4066Sahrens 1106fa9e4066Sahrens for (b = 0; b < zap->zap_f.zap_phys->zap_ptrtbl.zt_numblks; 1107fa9e4066Sahrens b++) { 1108fa9e4066Sahrens dmu_buf_t *db; 1109*ea8dc4b6Seschrock int err; 1110*ea8dc4b6Seschrock 1111*ea8dc4b6Seschrock err = dmu_buf_hold(zap->zap_objset, zap->zap_object, 1112*ea8dc4b6Seschrock (zap->zap_f.zap_phys->zap_ptrtbl.zt_blk + b) << bs, 1113*ea8dc4b6Seschrock FTAG, &db); 1114*ea8dc4b6Seschrock if (err == 0) { 1115*ea8dc4b6Seschrock zap_stats_ptrtbl(zap, db->db_data, 1116*ea8dc4b6Seschrock 1<<(bs-3), zs); 1117*ea8dc4b6Seschrock dmu_buf_rele(db, FTAG); 1118*ea8dc4b6Seschrock } 1119fa9e4066Sahrens } 1120fa9e4066Sahrens } 1121fa9e4066Sahrens } 1122