zap.c revision 478ed9ada0b6efe1318150a700986aa47e6a926d
fa9e4066f08beec538e775443c5be79dd423fcabahrens * CDDL HEADER START
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fa9e4066f08beec538e775443c5be79dd423fcabahrens * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
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fa9e4066f08beec538e775443c5be79dd423fcabahrens * CDDL HEADER END
478ed9ada0b6efe1318150a700986aa47e6a926dEric Taylor * Copyright 2009 Sun Microsystems, Inc. All rights reserved.
fa9e4066f08beec538e775443c5be79dd423fcabahrens * Use is subject to license terms.
fa9e4066f08beec538e775443c5be79dd423fcabahrens * This file contains the top half of the zfs directory structure
fa9e4066f08beec538e775443c5be79dd423fcabahrens * implementation. The bottom half is in zap_leaf.c.
fa9e4066f08beec538e775443c5be79dd423fcabahrens * The zdir is an extendable hash data structure. There is a table of
fa9e4066f08beec538e775443c5be79dd423fcabahrens * pointers to buckets (zap_t->zd_data->zd_leafs). The buckets are
fa9e4066f08beec538e775443c5be79dd423fcabahrens * each a constant size and hold a variable number of directory entries.
fa9e4066f08beec538e775443c5be79dd423fcabahrens * The buckets (aka "leaf nodes") are implemented in zap_leaf.c.
fa9e4066f08beec538e775443c5be79dd423fcabahrens * The pointer table holds a power of 2 number of pointers.
fa9e4066f08beec538e775443c5be79dd423fcabahrens * (1<<zap_t->zd_data->zd_phys->zd_prefix_len). The bucket pointed to
fa9e4066f08beec538e775443c5be79dd423fcabahrens * by the pointer at index i in the table holds entries whose hash value
fa9e4066f08beec538e775443c5be79dd423fcabahrens * has a zd_prefix_len - bit prefix
f65e61c04bc28ffd6bda04619c84330b420450b5ahrensint fzap_default_block_shift = 14; /* 16k blocksize */
fa9e4066f08beec538e775443c5be79dd423fcabahrensstatic void zap_leaf_pageout(dmu_buf_t *db, void *vl);
66328dd3ff7c6b3566c06478698593e061733076ahrensstatic uint64_t zap_allocate_blocks(zap_t *zap, int nblocks);
5ad820458efd0fdb914baff9c1447c22b819fa23nd if (block_type == ZBT_LEAF || block_type == BSWAP_64(ZBT_LEAF))
fa9e4066f08beec538e775443c5be79dd423fcabahrens /* it's a ptrtbl block */
fa9e4066f08beec538e775443c5be79dd423fcabahrens mutex_init(&zap->zap_f.zap_num_entries_mtx, 0, 0, 0);
f65e61c04bc28ffd6bda04619c84330b420450b5ahrens zap->zap_f.zap_block_shift = highbit(zap->zap_dbuf->db_size) - 1;
fa9e4066f08beec538e775443c5be79dd423fcabahrens * explicitly zero it since it might be coming from an
fa9e4066f08beec538e775443c5be79dd423fcabahrens * initialized microzap
f65e61c04bc28ffd6bda04619c84330b420450b5ahrens bzero(zap->zap_dbuf->db_data, zap->zap_dbuf->db_size);
f65e61c04bc28ffd6bda04619c84330b420450b5ahrens zp->zap_ptrtbl.zt_shift = ZAP_EMBEDDED_PTRTBL_SHIFT(zap);
fa9e4066f08beec538e775443c5be79dd423fcabahrens zp->zap_freeblk = 2; /* block 1 will be the first leaf */
f65e61c04bc28ffd6bda04619c84330b420450b5ahrens /* block 1 will be the first leaf */
fa9e4066f08beec538e775443c5be79dd423fcabahrens * set up block 1 - the first leaf
ea8dc4b6d2251b437950c0056bc626b311c73c27eschrock VERIFY(0 == dmu_buf_hold(zap->zap_objset, zap->zap_object,
fa9e4066f08beec538e775443c5be79dd423fcabahrens return (1);
fa9e4066f08beec538e775443c5be79dd423fcabahrens return (1);
fa9e4066f08beec538e775443c5be79dd423fcabahrens return (0);
fa9e4066f08beec538e775443c5be79dd423fcabahrens * Generic routines for dealing with the pointer & cookie tables.
fa9e4066f08beec538e775443c5be79dd423fcabahrens void (*transfer_func)(const uint64_t *src, uint64_t *dst, int n),
fa9e4066f08beec538e775443c5be79dd423fcabahrens /* hepb = half the number of entries in a block */
66328dd3ff7c6b3566c06478698593e061733076ahrens newblk = zap_allocate_blocks(zap, tbl->zt_numblks * 2);
66328dd3ff7c6b3566c06478698593e061733076ahrens * Copy the ptrtbl from the old to new location.
ea8dc4b6d2251b437950c0056bc626b311c73c27eschrock err = dmu_buf_hold(zap->zap_objset, zap->zap_object,
fa9e4066f08beec538e775443c5be79dd423fcabahrens /* first half of entries in old[b] go to new[2*b+0] */
ea8dc4b6d2251b437950c0056bc626b311c73c27eschrock VERIFY(0 == dmu_buf_hold(zap->zap_objset, zap->zap_object,
fa9e4066f08beec538e775443c5be79dd423fcabahrens transfer_func(db_old->db_data, db_new->db_data, hepb);
fa9e4066f08beec538e775443c5be79dd423fcabahrens /* second half of entries in old[b] go to new[2*b+1] */
ea8dc4b6d2251b437950c0056bc626b311c73c27eschrock VERIFY(0 == dmu_buf_hold(zap->zap_objset, zap->zap_object,
ea8dc4b6d2251b437950c0056bc626b311c73c27eschrock (void) dmu_free_range(zap->zap_objset, zap->zap_object,
fa9e4066f08beec538e775443c5be79dd423fcabahrens dprintf("finished; numblocks now %llu (%lluk entries)\n",
66328dd3ff7c6b3566c06478698593e061733076ahrens return (0);
fa9e4066f08beec538e775443c5be79dd423fcabahrenszap_table_store(zap_t *zap, zap_table_phys_t *tbl, uint64_t idx, uint64_t val,
ea8dc4b6d2251b437950c0056bc626b311c73c27eschrock err = dmu_buf_hold(zap->zap_objset, zap->zap_object,
ea8dc4b6d2251b437950c0056bc626b311c73c27eschrock err = dmu_buf_hold(zap->zap_objset, zap->zap_object,
ea8dc4b6d2251b437950c0056bc626b311c73c27eschrock return (0);
ea8dc4b6d2251b437950c0056bc626b311c73c27eschrockzap_table_load(zap_t *zap, zap_table_phys_t *tbl, uint64_t idx, uint64_t *valp)
ea8dc4b6d2251b437950c0056bc626b311c73c27eschrock err = dmu_buf_hold(zap->zap_objset, zap->zap_object,
ea8dc4b6d2251b437950c0056bc626b311c73c27eschrock * read the nextblk for the sake of i/o error checking,
ea8dc4b6d2251b437950c0056bc626b311c73c27eschrock * so that zap_table_load() will catch errors for
ea8dc4b6d2251b437950c0056bc626b311c73c27eschrock * zap_table_store.
ea8dc4b6d2251b437950c0056bc626b311c73c27eschrock err = dmu_buf_hold(zap->zap_objset, zap->zap_object,
fa9e4066f08beec538e775443c5be79dd423fcabahrens * Routines for growing the ptrtbl.
fa9e4066f08beec538e775443c5be79dd423fcabahrenszap_ptrtbl_transfer(const uint64_t *src, uint64_t *dst, int n)
fa9e4066f08beec538e775443c5be79dd423fcabahrens for (i = 0; i < n; i++) {
66328dd3ff7c6b3566c06478698593e061733076ahrens /* In case things go horribly wrong. */
66328dd3ff7c6b3566c06478698593e061733076ahrens if (zap->zap_f.zap_phys->zap_ptrtbl.zt_shift >= ZAP_HASHBITS-2)
fa9e4066f08beec538e775443c5be79dd423fcabahrens if (zap->zap_f.zap_phys->zap_ptrtbl.zt_numblks == 0) {
f65e61c04bc28ffd6bda04619c84330b420450b5ahrens * We are outgrowing the "embedded" ptrtbl (the one
f65e61c04bc28ffd6bda04619c84330b420450b5ahrens * stored in the header block). Give it its own entire
f65e61c04bc28ffd6bda04619c84330b420450b5ahrens * block, which will double the size of the ptrtbl.
fa9e4066f08beec538e775443c5be79dd423fcabahrens ASSERT3U(zap->zap_f.zap_phys->zap_ptrtbl.zt_shift, ==,
fa9e4066f08beec538e775443c5be79dd423fcabahrens ASSERT3U(zap->zap_f.zap_phys->zap_ptrtbl.zt_blk, ==, 0);
ea8dc4b6d2251b437950c0056bc626b311c73c27eschrock err = dmu_buf_hold(zap->zap_objset, zap->zap_object,
f65e61c04bc28ffd6bda04619c84330b420450b5ahrens zap_ptrtbl_transfer(&ZAP_EMBEDDED_PTRTBL_ENT(zap, 0),
f65e61c04bc28ffd6bda04619c84330b420450b5ahrens db_new->db_data, 1 << ZAP_EMBEDDED_PTRTBL_SHIFT(zap));
fa9e4066f08beec538e775443c5be79dd423fcabahrens ASSERT3U(1ULL << zap->zap_f.zap_phys->zap_ptrtbl.zt_shift, ==,
66328dd3ff7c6b3566c06478698593e061733076ahrens return (0);
66328dd3ff7c6b3566c06478698593e061733076ahrens return (zap_table_grow(zap, &zap->zap_f.zap_phys->zap_ptrtbl,
fa9e4066f08beec538e775443c5be79dd423fcabahrenszap_increment_num_entries(zap_t *zap, int delta, dmu_tx_t *tx)
fa9e4066f08beec538e775443c5be79dd423fcabahrens ASSERT(delta > 0 || zap->zap_f.zap_phys->zap_num_entries >= -delta);
fa9e4066f08beec538e775443c5be79dd423fcabahrens zap_leaf_t *l = kmem_alloc(sizeof (zap_leaf_t), KM_SLEEP);
ea8dc4b6d2251b437950c0056bc626b311c73c27eschrock VERIFY(0 == dmu_buf_hold(zap->zap_objset, zap->zap_object,
ea8dc4b6d2251b437950c0056bc626b311c73c27eschrock l->l_blkid << FZAP_BLOCK_SHIFT(zap), NULL, &l->l_dbuf));
fa9e4066f08beec538e775443c5be79dd423fcabahrens winner = dmu_buf_set_user(l->l_dbuf, l, &l->l_phys, zap_leaf_pageout);
66328dd3ff7c6b3566c06478698593e061733076ahrens return (l);
fa9e4066f08beec538e775443c5be79dd423fcabahrens mutex_enter(&zap->zap_f.zap_num_entries_mtx); /* unnecessary */
fa9e4066f08beec538e775443c5be79dd423fcabahrens return (0);
fa9e4066f08beec538e775443c5be79dd423fcabahrens * Routines for obtaining zap_leaf_t's
fa9e4066f08beec538e775443c5be79dd423fcabahrens winner = dmu_buf_set_user(db, l, &l->l_phys, zap_leaf_pageout);
fa9e4066f08beec538e775443c5be79dd423fcabahrens /* someone else set it first */
66328dd3ff7c6b3566c06478698593e061733076ahrens * lhr_pad was previously used for the next leaf in the leaf
66328dd3ff7c6b3566c06478698593e061733076ahrens * chain. There should be no chained leafs (as we have removed
66328dd3ff7c6b3566c06478698593e061733076ahrens * support for them).
f65e61c04bc28ffd6bda04619c84330b420450b5ahrens * There should be more hash entries than there can be
f65e61c04bc28ffd6bda04619c84330b420450b5ahrens * chunks to put in the hash table
f65e61c04bc28ffd6bda04619c84330b420450b5ahrens ASSERT3U(ZAP_LEAF_HASH_NUMENTRIES(l), >, ZAP_LEAF_NUMCHUNKS(l) / 3);
f65e61c04bc28ffd6bda04619c84330b420450b5ahrens /* The chunks should begin at the end of the hash table */
f65e61c04bc28ffd6bda04619c84330b420450b5ahrens /* The chunks should end at the end of the block */
f65e61c04bc28ffd6bda04619c84330b420450b5ahrens ASSERT3U((uintptr_t)&ZAP_LEAF_CHUNK(l, ZAP_LEAF_NUMCHUNKS(l)) -
fa9e4066f08beec538e775443c5be79dd423fcabahrens return (l);
66328dd3ff7c6b3566c06478698593e061733076ahrenszap_get_leaf_byblk(zap_t *zap, uint64_t blkid, dmu_tx_t *tx, krw_t lt,
ea8dc4b6d2251b437950c0056bc626b311c73c27eschrock err = dmu_buf_hold(zap->zap_objset, zap->zap_object,
fa9e4066f08beec538e775443c5be79dd423fcabahrens * Must lock before dirtying, otherwise l->l_phys could change,
fa9e4066f08beec538e775443c5be79dd423fcabahrens * causing ASSERT below to fail.
66328dd3ff7c6b3566c06478698593e061733076ahrens ASSERT3U(l->l_phys->l_hdr.lh_block_type, ==, ZBT_LEAF);
66328dd3ff7c6b3566c06478698593e061733076ahrens ASSERT3U(l->l_phys->l_hdr.lh_magic, ==, ZAP_LEAF_MAGIC);
ea8dc4b6d2251b437950c0056bc626b311c73c27eschrock return (0);
ea8dc4b6d2251b437950c0056bc626b311c73c27eschrockzap_idx_to_blk(zap_t *zap, uint64_t idx, uint64_t *valp)
fa9e4066f08beec538e775443c5be79dd423fcabahrens if (zap->zap_f.zap_phys->zap_ptrtbl.zt_numblks == 0) {
ea8dc4b6d2251b437950c0056bc626b311c73c27eschrock return (0);
fa9e4066f08beec538e775443c5be79dd423fcabahrens return (zap_table_load(zap, &zap->zap_f.zap_phys->zap_ptrtbl,
fa9e4066f08beec538e775443c5be79dd423fcabahrenszap_set_idx_to_blk(zap_t *zap, uint64_t idx, uint64_t blk, dmu_tx_t *tx)
ea8dc4b6d2251b437950c0056bc626b311c73c27eschrock return (0);
ea8dc4b6d2251b437950c0056bc626b311c73c27eschrock return (zap_table_store(zap, &zap->zap_f.zap_phys->zap_ptrtbl,
ea8dc4b6d2251b437950c0056bc626b311c73c27eschrockzap_deref_leaf(zap_t *zap, uint64_t h, dmu_tx_t *tx, krw_t lt, zap_leaf_t **lp)
fa9e4066f08beec538e775443c5be79dd423fcabahrens ASSERT3U(zap->zap_f.zap_phys->zap_magic, ==, ZAP_MAGIC);
fa9e4066f08beec538e775443c5be79dd423fcabahrens idx = ZAP_HASH_IDX(h, zap->zap_f.zap_phys->zap_ptrtbl.zt_shift);
66328dd3ff7c6b3566c06478698593e061733076ahrens ASSERT(err || ZAP_HASH_IDX(h, (*lp)->l_phys->l_hdr.lh_prefix_len) ==
ad860c82b2a8ffe69f42630da73ded0c92a7a36ebonwickzap_expand_leaf(zap_name_t *zn, zap_leaf_t *l, dmu_tx_t *tx, zap_leaf_t **lp)
66328dd3ff7c6b3566c06478698593e061733076ahrens ASSERT3U(old_prefix_len, <=, zap->zap_f.zap_phys->zap_ptrtbl.zt_shift);
66328dd3ff7c6b3566c06478698593e061733076ahrens old_prefix_len == zap->zap_f.zap_phys->zap_ptrtbl.zt_shift) {
66328dd3ff7c6b3566c06478698593e061733076ahrens /* We failed to upgrade, or need to grow the pointer table */
66328dd3ff7c6b3566c06478698593e061733076ahrens if (l->l_phys->l_hdr.lh_prefix_len != old_prefix_len) {
fa9e4066f08beec538e775443c5be79dd423fcabahrens /* it split while our locks were down */
ea8dc4b6d2251b437950c0056bc626b311c73c27eschrock return (0);
66328dd3ff7c6b3566c06478698593e061733076ahrens ASSERT3U(old_prefix_len, <, zap->zap_f.zap_phys->zap_ptrtbl.zt_shift);
66328dd3ff7c6b3566c06478698593e061733076ahrens prefix_diff = zap->zap_f.zap_phys->zap_ptrtbl.zt_shift -
66328dd3ff7c6b3566c06478698593e061733076ahrens sibling = (ZAP_HASH_IDX(hash, old_prefix_len + 1) | 1) << prefix_diff;
ea8dc4b6d2251b437950c0056bc626b311c73c27eschrock /* check for i/o errors before doing zap_leaf_split */
66328dd3ff7c6b3566c06478698593e061733076ahrens /* set sibling pointers */
ea8dc4b6d2251b437950c0056bc626b311c73c27eschrock err = zap_set_idx_to_blk(zap, sibling+i, nl->l_blkid, tx);
ea8dc4b6d2251b437950c0056bc626b311c73c27eschrock ASSERT3U(err, ==, 0); /* we checked for i/o errors above */
66328dd3ff7c6b3566c06478698593e061733076ahrens if (hash & (1ULL << (64 - l->l_phys->l_hdr.lh_prefix_len))) {
fa9e4066f08beec538e775443c5be79dd423fcabahrens /* we want the sibling */
ea8dc4b6d2251b437950c0056bc626b311c73c27eschrock return (0);
ad860c82b2a8ffe69f42630da73ded0c92a7a36ebonwickzap_put_leaf_maybe_grow_ptrtbl(zap_name_t *zn, zap_leaf_t *l, dmu_tx_t *tx)
66328dd3ff7c6b3566c06478698593e061733076ahrens int shift = zap->zap_f.zap_phys->zap_ptrtbl.zt_shift;
66328dd3ff7c6b3566c06478698593e061733076ahrens int leaffull = (l->l_phys->l_hdr.lh_prefix_len == shift &&
66328dd3ff7c6b3566c06478698593e061733076ahrens if (leaffull || zap->zap_f.zap_phys->zap_ptrtbl.zt_nextblk) {
66328dd3ff7c6b3566c06478698593e061733076ahrens * We are in the middle of growing the pointer table, or
66328dd3ff7c6b3566c06478698593e061733076ahrens * this leaf will soon make us grow it.
66328dd3ff7c6b3566c06478698593e061733076ahrens /* could have finished growing while our locks were down */
66328dd3ff7c6b3566c06478698593e061733076ahrens if (zap->zap_f.zap_phys->zap_ptrtbl.zt_shift == shift)
66328dd3ff7c6b3566c06478698593e061733076ahrensfzap_checksize(const char *name, uint64_t integer_size, uint64_t num_integers)
fa9e4066f08beec538e775443c5be79dd423fcabahrens /* Only integer sizes supported by C */
fa9e4066f08beec538e775443c5be79dd423fcabahrens return (0);
da6c28aaf62fa55f0fdb8004aa40f88f23bf53f0amw * Routines for manipulating attributes.
da6c28aaf62fa55f0fdb8004aa40f88f23bf53f0amw uint64_t integer_size, uint64_t num_integers, void *buf,
da6c28aaf62fa55f0fdb8004aa40f88f23bf53f0amw err = fzap_checksize(zn->zn_name_orij, integer_size, num_integers);
da6c28aaf62fa55f0fdb8004aa40f88f23bf53f0amw err = zap_deref_leaf(zn->zn_zap, zn->zn_hash, NULL, RW_READER, &l);
da6c28aaf62fa55f0fdb8004aa40f88f23bf53f0amw if (err == 0) {
66328dd3ff7c6b3566c06478698593e061733076ahrens err = zap_entry_read(&zeh, integer_size, num_integers, buf);
da6c28aaf62fa55f0fdb8004aa40f88f23bf53f0amw err = zap_deref_leaf(zap, zn->zn_hash, tx, RW_WRITER, &l);
fa9e4066f08beec538e775443c5be79dd423fcabahrens if (err == 0) {
da6c28aaf62fa55f0fdb8004aa40f88f23bf53f0amw err = zap_entry_create(l, zn->zn_name_orij, zn->zn_hash, cd,
fa9e4066f08beec538e775443c5be79dd423fcabahrens if (err == 0) {
ad860c82b2a8ffe69f42630da73ded0c92a7a36ebonwick zap = zn->zn_zap; /* zap_expand_leaf() may change zap */
da6c28aaf62fa55f0fdb8004aa40f88f23bf53f0amw int err = fzap_checksize(zn->zn_name_orij, integer_size, num_integers);
fa9e4066f08beec538e775443c5be79dd423fcabahrens int integer_size, uint64_t num_integers, const void *val, dmu_tx_t *tx)
da6c28aaf62fa55f0fdb8004aa40f88f23bf53f0amw err = fzap_checksize(zn->zn_name_orij, integer_size, num_integers);
da6c28aaf62fa55f0fdb8004aa40f88f23bf53f0amw err = zap_deref_leaf(zap, zn->zn_hash, tx, RW_WRITER, &l);
da6c28aaf62fa55f0fdb8004aa40f88f23bf53f0amw err = zap_entry_create(l, zn->zn_name_orij, zn->zn_hash,
fa9e4066f08beec538e775443c5be79dd423fcabahrens err = zap_entry_update(&zeh, integer_size, num_integers, val);
ad860c82b2a8ffe69f42630da73ded0c92a7a36ebonwick zap = zn->zn_zap; /* zap_expand_leaf() may change zap */
da6c28aaf62fa55f0fdb8004aa40f88f23bf53f0amw err = zap_deref_leaf(zn->zn_zap, zn->zn_hash, NULL, RW_READER, &l);
da6c28aaf62fa55f0fdb8004aa40f88f23bf53f0amw err = zap_deref_leaf(zn->zn_zap, zn->zn_hash, tx, RW_WRITER, &l);
fa9e4066f08beec538e775443c5be79dd423fcabahrens if (err == 0) {
088f389458728c464569a5506b58070254fa4f7dahrens * Helper functions for consumers.
e7437265dc2a4920c197ed4337665539d358b22cahrenszap_value_search(objset_t *os, uint64_t zapobj, uint64_t value, uint64_t mask,
e7437265dc2a4920c197ed4337665539d358b22cahrens if ((za->za_first_integer & mask) == (value & mask)) {
088f389458728c464569a5506b58070254fa4f7dahrenszap_join(objset_t *os, uint64_t fromobj, uint64_t intoobj, dmu_tx_t *tx)
088f389458728c464569a5506b58070254fa4f7dahrens if (za.za_integer_length != 8 || za.za_num_integers != 1)
088f389458728c464569a5506b58070254fa4f7dahrens return (0);
088f389458728c464569a5506b58070254fa4f7dahrenszap_add_int(objset_t *os, uint64_t obj, uint64_t value, dmu_tx_t *tx)
088f389458728c464569a5506b58070254fa4f7dahrens (void) snprintf(name, sizeof (name), "%llx", (longlong_t)value);
088f389458728c464569a5506b58070254fa4f7dahrenszap_remove_int(objset_t *os, uint64_t obj, uint64_t value, dmu_tx_t *tx)
088f389458728c464569a5506b58070254fa4f7dahrens (void) snprintf(name, sizeof (name), "%llx", (longlong_t)value);
088f389458728c464569a5506b58070254fa4f7dahrenszap_lookup_int(objset_t *os, uint64_t obj, uint64_t value)
088f389458728c464569a5506b58070254fa4f7dahrens (void) snprintf(name, sizeof (name), "%llx", (longlong_t)value);
fa9e4066f08beec538e775443c5be79dd423fcabahrens * Routines for iterating over the attributes.
fa9e4066f08beec538e775443c5be79dd423fcabahrensfzap_cursor_retrieve(zap_t *zap, zap_cursor_t *zc, zap_attribute_t *za)
fa9e4066f08beec538e775443c5be79dd423fcabahrens /* retrieve the next entry at or after zc_hash/zc_cd */
fa9e4066f08beec538e775443c5be79dd423fcabahrens /* if no entry, return ENOENT */
ea8dc4b6d2251b437950c0056bc626b311c73c27eschrock err = zap_deref_leaf(zap, zc->zc_hash, NULL, RW_READER,
fa9e4066f08beec538e775443c5be79dd423fcabahrens err = zap_leaf_lookup_closest(l, zc->zc_hash, zc->zc_cd, &zeh);
66328dd3ff7c6b3566c06478698593e061733076ahrens if (l->l_phys->l_hdr.lh_prefix_len == 0 || zc->zc_hash == 0) {
fa9e4066f08beec538e775443c5be79dd423fcabahrens if (err == 0) {
fa9e4066f08beec538e775443c5be79dd423fcabahrens err = zap_entry_read(&zeh, 8, 1, &za->za_first_integer);
fa9e4066f08beec538e775443c5be79dd423fcabahrenszap_stats_ptrtbl(zap_t *zap, uint64_t *tbl, int len, zap_stats_t *zs)
fa9e4066f08beec538e775443c5be79dd423fcabahrens * NB: if a leaf has more pointers than an entire ptrtbl block
fa9e4066f08beec538e775443c5be79dd423fcabahrens * can hold, then it'll be accounted for more than once, since
fa9e4066f08beec538e775443c5be79dd423fcabahrens * we won't have lastblk.
fa9e4066f08beec538e775443c5be79dd423fcabahrens for (i = 0; i < len; i++) {
ea8dc4b6d2251b437950c0056bc626b311c73c27eschrock err = zap_get_leaf_byblk(zap, tbl[i], NULL, RW_READER, &l);
ea8dc4b6d2251b437950c0056bc626b311c73c27eschrock if (err == 0) {
8248818d5849649ef734d62da097e90222a23763nd * Set zap_phys_t fields
fa9e4066f08beec538e775443c5be79dd423fcabahrens zs->zs_num_leafs = zap->zap_f.zap_phys->zap_num_leafs;
fa9e4066f08beec538e775443c5be79dd423fcabahrens zs->zs_num_entries = zap->zap_f.zap_phys->zap_num_entries;
fa9e4066f08beec538e775443c5be79dd423fcabahrens zs->zs_num_blocks = zap->zap_f.zap_phys->zap_freeblk;
8248818d5849649ef734d62da097e90222a23763nd * Set zap_ptrtbl fields
8248818d5849649ef734d62da097e90222a23763nd zs->zs_ptrtbl_len = 1ULL << zap->zap_f.zap_phys->zap_ptrtbl.zt_shift;
8248818d5849649ef734d62da097e90222a23763nd zs->zs_ptrtbl_nextblk = zap->zap_f.zap_phys->zap_ptrtbl.zt_nextblk;
8248818d5849649ef734d62da097e90222a23763nd zs->zs_ptrtbl_zt_blk = zap->zap_f.zap_phys->zap_ptrtbl.zt_blk;
8248818d5849649ef734d62da097e90222a23763nd zs->zs_ptrtbl_zt_numblks = zap->zap_f.zap_phys->zap_ptrtbl.zt_numblks;
8248818d5849649ef734d62da097e90222a23763nd zs->zs_ptrtbl_zt_shift = zap->zap_f.zap_phys->zap_ptrtbl.zt_shift;
fa9e4066f08beec538e775443c5be79dd423fcabahrens if (zap->zap_f.zap_phys->zap_ptrtbl.zt_numblks == 0) {
fa9e4066f08beec538e775443c5be79dd423fcabahrens /* the ptrtbl is entirely in the header block. */
f65e61c04bc28ffd6bda04619c84330b420450b5ahrens zap_stats_ptrtbl(zap, &ZAP_EMBEDDED_PTRTBL_ENT(zap, 0),
fa9e4066f08beec538e775443c5be79dd423fcabahrens for (b = 0; b < zap->zap_f.zap_phys->zap_ptrtbl.zt_numblks;
ea8dc4b6d2251b437950c0056bc626b311c73c27eschrock err = dmu_buf_hold(zap->zap_objset, zap->zap_object,
ea8dc4b6d2251b437950c0056bc626b311c73c27eschrock (zap->zap_f.zap_phys->zap_ptrtbl.zt_blk + b) << bs,
ea8dc4b6d2251b437950c0056bc626b311c73c27eschrock if (err == 0) {