--- /dev/null
+/*
+ * CDDL HEADER START
+ *
+ * The contents of this file are subject to the terms of the
+ * Common Development and Distribution License (the "License").
+ * You may not use this file except in compliance with the License.
+ *
+ * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
+ * or http://www.opensolaris.org/os/licensing.
+ * See the License for the specific language governing permissions
+ * and limitations under the License.
+ *
+ * When distributing Covered Code, include this CDDL HEADER in each
+ * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
+ * If applicable, add the following below this CDDL HEADER, with the
+ * fields enclosed by brackets "[]" replaced with your own identifying
+ * information: Portions Copyright [yyyy] [name of copyright owner]
+ *
+ * CDDL HEADER END
+ */
+/*
+ * Copyright 2008 Sun Microsystems, Inc. All rights reserved.
+ * Use is subject to license terms.
+ */
+
+#pragma ident "%Z%%M% %I% %E% SMI"
+
+#include <sys/spa.h>
+#include <sys/dmu.h>
+#include <sys/zfs_context.h>
+#include <sys/zap.h>
+#include <sys/refcount.h>
+#include <sys/zap_impl.h>
+#include <sys/zap_leaf.h>
+#include <sys/avl.h>
+
+#ifdef _KERNEL
+#include <sys/sunddi.h>
+#endif
+
+static int mzap_upgrade(zap_t **zapp, dmu_tx_t *tx);
+
+
+static uint64_t
+zap_hash(zap_t *zap, const char *normname)
+{
+ const uint8_t *cp;
+ uint8_t c;
+ uint64_t crc = zap->zap_salt;
+
+ /* NB: name must already be normalized, if necessary */
+
+ ASSERT(crc != 0);
+ ASSERT(zfs_crc64_table[128] == ZFS_CRC64_POLY);
+ for (cp = (const uint8_t *)normname; (c = *cp) != '\0'; cp++) {
+ crc = (crc >> 8) ^ zfs_crc64_table[(crc ^ c) & 0xFF];
+ }
+
+ /*
+ * Only use 28 bits, since we need 4 bits in the cookie for the
+ * collision differentiator. We MUST use the high bits, since
+ * those are the ones that we first pay attention to when
+ * chosing the bucket.
+ */
+ crc &= ~((1ULL << (64 - ZAP_HASHBITS)) - 1);
+
+ return (crc);
+}
+
+static int
+zap_normalize(zap_t *zap, const char *name, char *namenorm)
+{
+ size_t inlen, outlen;
+ int err;
+
+ inlen = strlen(name) + 1;
+ outlen = ZAP_MAXNAMELEN;
+
+ err = 0;
+ (void) u8_textprep_str((char *)name, &inlen, namenorm, &outlen,
+ zap->zap_normflags | U8_TEXTPREP_IGNORE_NULL, U8_UNICODE_LATEST,
+ &err);
+
+ return (err);
+}
+
+boolean_t
+zap_match(zap_name_t *zn, const char *matchname)
+{
+ if (zn->zn_matchtype == MT_FIRST) {
+ char norm[ZAP_MAXNAMELEN];
+
+ if (zap_normalize(zn->zn_zap, matchname, norm) != 0)
+ return (B_FALSE);
+
+ return (strcmp(zn->zn_name_norm, norm) == 0);
+ } else {
+ /* MT_BEST or MT_EXACT */
+ return (strcmp(zn->zn_name_orij, matchname) == 0);
+ }
+}
+
+void
+zap_name_free(zap_name_t *zn)
+{
+ kmem_free(zn, sizeof (zap_name_t));
+}
+
+/* XXX combine this with zap_lockdir()? */
+zap_name_t *
+zap_name_alloc(zap_t *zap, const char *name, matchtype_t mt)
+{
+ zap_name_t *zn = kmem_alloc(sizeof (zap_name_t), KM_SLEEP);
+
+ zn->zn_zap = zap;
+ zn->zn_name_orij = name;
+ zn->zn_matchtype = mt;
+ if (zap->zap_normflags) {
+ if (zap_normalize(zap, name, zn->zn_normbuf) != 0) {
+ zap_name_free(zn);
+ return (NULL);
+ }
+ zn->zn_name_norm = zn->zn_normbuf;
+ } else {
+ if (mt != MT_EXACT) {
+ zap_name_free(zn);
+ return (NULL);
+ }
+ zn->zn_name_norm = zn->zn_name_orij;
+ }
+
+ zn->zn_hash = zap_hash(zap, zn->zn_name_norm);
+ return (zn);
+}
+
+static void
+mzap_byteswap(mzap_phys_t *buf, size_t size)
+{
+ int i, max;
+ buf->mz_block_type = BSWAP_64(buf->mz_block_type);
+ buf->mz_salt = BSWAP_64(buf->mz_salt);
+ buf->mz_normflags = BSWAP_64(buf->mz_normflags);
+ max = (size / MZAP_ENT_LEN) - 1;
+ for (i = 0; i < max; i++) {
+ buf->mz_chunk[i].mze_value =
+ BSWAP_64(buf->mz_chunk[i].mze_value);
+ buf->mz_chunk[i].mze_cd =
+ BSWAP_32(buf->mz_chunk[i].mze_cd);
+ }
+}
+
+void
+zap_byteswap(void *buf, size_t size)
+{
+ uint64_t block_type;
+
+ block_type = *(uint64_t *)buf;
+
+ if (block_type == ZBT_MICRO || block_type == BSWAP_64(ZBT_MICRO)) {
+ /* ASSERT(magic == ZAP_LEAF_MAGIC); */
+ mzap_byteswap(buf, size);
+ } else {
+ fzap_byteswap(buf, size);
+ }
+}
+
+static int
+mze_compare(const void *arg1, const void *arg2)
+{
+ const mzap_ent_t *mze1 = arg1;
+ const mzap_ent_t *mze2 = arg2;
+
+ if (mze1->mze_hash > mze2->mze_hash)
+ return (+1);
+ if (mze1->mze_hash < mze2->mze_hash)
+ return (-1);
+ if (mze1->mze_phys.mze_cd > mze2->mze_phys.mze_cd)
+ return (+1);
+ if (mze1->mze_phys.mze_cd < mze2->mze_phys.mze_cd)
+ return (-1);
+ return (0);
+}
+
+static void
+mze_insert(zap_t *zap, int chunkid, uint64_t hash, mzap_ent_phys_t *mzep)
+{
+ mzap_ent_t *mze;
+
+ ASSERT(zap->zap_ismicro);
+ ASSERT(RW_WRITE_HELD(&zap->zap_rwlock));
+ ASSERT(mzep->mze_cd < ZAP_MAXCD);
+
+ mze = kmem_alloc(sizeof (mzap_ent_t), KM_SLEEP);
+ mze->mze_chunkid = chunkid;
+ mze->mze_hash = hash;
+ mze->mze_phys = *mzep;
+ avl_add(&zap->zap_m.zap_avl, mze);
+}
+
+static mzap_ent_t *
+mze_find(zap_name_t *zn)
+{
+ mzap_ent_t mze_tofind;
+ mzap_ent_t *mze;
+ avl_index_t idx;
+ avl_tree_t *avl = &zn->zn_zap->zap_m.zap_avl;
+
+ ASSERT(zn->zn_zap->zap_ismicro);
+ ASSERT(RW_LOCK_HELD(&zn->zn_zap->zap_rwlock));
+
+ if (strlen(zn->zn_name_norm) >= sizeof (mze_tofind.mze_phys.mze_name))
+ return (NULL);
+
+ mze_tofind.mze_hash = zn->zn_hash;
+ mze_tofind.mze_phys.mze_cd = 0;
+
+again:
+ mze = avl_find(avl, &mze_tofind, &idx);
+ if (mze == NULL)
+ mze = avl_nearest(avl, idx, AVL_AFTER);
+ for (; mze && mze->mze_hash == zn->zn_hash; mze = AVL_NEXT(avl, mze)) {
+ if (zap_match(zn, mze->mze_phys.mze_name))
+ return (mze);
+ }
+ if (zn->zn_matchtype == MT_BEST) {
+ zn->zn_matchtype = MT_FIRST;
+ goto again;
+ }
+ return (NULL);
+}
+
+static uint32_t
+mze_find_unused_cd(zap_t *zap, uint64_t hash)
+{
+ mzap_ent_t mze_tofind;
+ mzap_ent_t *mze;
+ avl_index_t idx;
+ avl_tree_t *avl = &zap->zap_m.zap_avl;
+ uint32_t cd;
+
+ ASSERT(zap->zap_ismicro);
+ ASSERT(RW_LOCK_HELD(&zap->zap_rwlock));
+
+ mze_tofind.mze_hash = hash;
+ mze_tofind.mze_phys.mze_cd = 0;
+
+ cd = 0;
+ for (mze = avl_find(avl, &mze_tofind, &idx);
+ mze && mze->mze_hash == hash; mze = AVL_NEXT(avl, mze)) {
+ if (mze->mze_phys.mze_cd != cd)
+ break;
+ cd++;
+ }
+
+ return (cd);
+}
+
+static void
+mze_remove(zap_t *zap, mzap_ent_t *mze)
+{
+ ASSERT(zap->zap_ismicro);
+ ASSERT(RW_WRITE_HELD(&zap->zap_rwlock));
+
+ avl_remove(&zap->zap_m.zap_avl, mze);
+ kmem_free(mze, sizeof (mzap_ent_t));
+}
+
+static void
+mze_destroy(zap_t *zap)
+{
+ mzap_ent_t *mze;
+ void *avlcookie = NULL;
+
+ while (mze = avl_destroy_nodes(&zap->zap_m.zap_avl, &avlcookie))
+ kmem_free(mze, sizeof (mzap_ent_t));
+ avl_destroy(&zap->zap_m.zap_avl);
+}
+
+static zap_t *
+mzap_open(objset_t *os, uint64_t obj, dmu_buf_t *db)
+{
+ zap_t *winner;
+ zap_t *zap;
+ int i;
+
+ ASSERT3U(MZAP_ENT_LEN, ==, sizeof (mzap_ent_phys_t));
+
+ zap = kmem_zalloc(sizeof (zap_t), KM_SLEEP);
+ rw_init(&zap->zap_rwlock, 0, 0, 0);
+ rw_enter(&zap->zap_rwlock, RW_WRITER);
+ zap->zap_objset = os;
+ zap->zap_object = obj;
+ zap->zap_dbuf = db;
+
+ if (*(uint64_t *)db->db_data != ZBT_MICRO) {
+ mutex_init(&zap->zap_f.zap_num_entries_mtx, 0, 0, 0);
+ zap->zap_f.zap_block_shift = highbit(db->db_size) - 1;
+ } else {
+ zap->zap_ismicro = TRUE;
+ }
+
+ /*
+ * Make sure that zap_ismicro is set before we let others see
+ * it, because zap_lockdir() checks zap_ismicro without the lock
+ * held.
+ */
+ winner = dmu_buf_set_user(db, zap, &zap->zap_m.zap_phys, zap_evict);
+
+ if (winner != NULL) {
+ rw_exit(&zap->zap_rwlock);
+ rw_destroy(&zap->zap_rwlock);
+ if (!zap->zap_ismicro)
+ mutex_destroy(&zap->zap_f.zap_num_entries_mtx);
+ kmem_free(zap, sizeof (zap_t));
+ return (winner);
+ }
+
+ if (zap->zap_ismicro) {
+ zap->zap_salt = zap->zap_m.zap_phys->mz_salt;
+ zap->zap_normflags = zap->zap_m.zap_phys->mz_normflags;
+ zap->zap_m.zap_num_chunks = db->db_size / MZAP_ENT_LEN - 1;
+ avl_create(&zap->zap_m.zap_avl, mze_compare,
+ sizeof (mzap_ent_t), offsetof(mzap_ent_t, mze_node));
+
+ for (i = 0; i < zap->zap_m.zap_num_chunks; i++) {
+ mzap_ent_phys_t *mze =
+ &zap->zap_m.zap_phys->mz_chunk[i];
+ if (mze->mze_name[0]) {
+ zap_name_t *zn;
+
+ zap->zap_m.zap_num_entries++;
+ zn = zap_name_alloc(zap, mze->mze_name,
+ MT_EXACT);
+ mze_insert(zap, i, zn->zn_hash, mze);
+ zap_name_free(zn);
+ }
+ }
+ } else {
+ zap->zap_salt = zap->zap_f.zap_phys->zap_salt;
+ zap->zap_normflags = zap->zap_f.zap_phys->zap_normflags;
+
+ ASSERT3U(sizeof (struct zap_leaf_header), ==,
+ 2*ZAP_LEAF_CHUNKSIZE);
+
+ /*
+ * The embedded pointer table should not overlap the
+ * other members.
+ */
+ ASSERT3P(&ZAP_EMBEDDED_PTRTBL_ENT(zap, 0), >,
+ &zap->zap_f.zap_phys->zap_salt);
+
+ /*
+ * The embedded pointer table should end at the end of
+ * the block
+ */
+ ASSERT3U((uintptr_t)&ZAP_EMBEDDED_PTRTBL_ENT(zap,
+ 1<<ZAP_EMBEDDED_PTRTBL_SHIFT(zap)) -
+ (uintptr_t)zap->zap_f.zap_phys, ==,
+ zap->zap_dbuf->db_size);
+ }
+ rw_exit(&zap->zap_rwlock);
+ return (zap);
+}
+
+int
+zap_lockdir(objset_t *os, uint64_t obj, dmu_tx_t *tx,
+ krw_t lti, boolean_t fatreader, boolean_t adding, zap_t **zapp)
+{
+ zap_t *zap;
+ dmu_buf_t *db;
+ krw_t lt;
+ int err;
+
+ *zapp = NULL;
+
+ err = dmu_buf_hold(os, obj, 0, NULL, &db);
+ if (err)
+ return (err);
+
+#ifdef ZFS_DEBUG
+ {
+ dmu_object_info_t doi;
+ dmu_object_info_from_db(db, &doi);
+ ASSERT(dmu_ot[doi.doi_type].ot_byteswap == zap_byteswap);
+ }
+#endif
+
+ zap = dmu_buf_get_user(db);
+ if (zap == NULL)
+ zap = mzap_open(os, obj, db);
+
+ /*
+ * We're checking zap_ismicro without the lock held, in order to
+ * tell what type of lock we want. Once we have some sort of
+ * lock, see if it really is the right type. In practice this
+ * can only be different if it was upgraded from micro to fat,
+ * and micro wanted WRITER but fat only needs READER.
+ */
+ lt = (!zap->zap_ismicro && fatreader) ? RW_READER : lti;
+ rw_enter(&zap->zap_rwlock, lt);
+ if (lt != ((!zap->zap_ismicro && fatreader) ? RW_READER : lti)) {
+ /* it was upgraded, now we only need reader */
+ ASSERT(lt == RW_WRITER);
+ ASSERT(RW_READER ==
+ (!zap->zap_ismicro && fatreader) ? RW_READER : lti);
+ rw_downgrade(&zap->zap_rwlock);
+ lt = RW_READER;
+ }
+
+ zap->zap_objset = os;
+
+ if (lt == RW_WRITER)
+ dmu_buf_will_dirty(db, tx);
+
+ ASSERT3P(zap->zap_dbuf, ==, db);
+
+ ASSERT(!zap->zap_ismicro ||
+ zap->zap_m.zap_num_entries <= zap->zap_m.zap_num_chunks);
+ if (zap->zap_ismicro && tx && adding &&
+ zap->zap_m.zap_num_entries == zap->zap_m.zap_num_chunks) {
+ uint64_t newsz = db->db_size + SPA_MINBLOCKSIZE;
+ if (newsz > MZAP_MAX_BLKSZ) {
+ dprintf("upgrading obj %llu: num_entries=%u\n",
+ obj, zap->zap_m.zap_num_entries);
+ *zapp = zap;
+ return (mzap_upgrade(zapp, tx));
+ }
+ err = dmu_object_set_blocksize(os, obj, newsz, 0, tx);
+ ASSERT3U(err, ==, 0);
+ zap->zap_m.zap_num_chunks =
+ db->db_size / MZAP_ENT_LEN - 1;
+ }
+
+ *zapp = zap;
+ return (0);
+}
+
+void
+zap_unlockdir(zap_t *zap)
+{
+ rw_exit(&zap->zap_rwlock);
+ dmu_buf_rele(zap->zap_dbuf, NULL);
+}
+
+static int
+mzap_upgrade(zap_t **zapp, dmu_tx_t *tx)
+{
+ mzap_phys_t *mzp;
+ int i, sz, nchunks, err;
+ zap_t *zap = *zapp;
+
+ ASSERT(RW_WRITE_HELD(&zap->zap_rwlock));
+
+ sz = zap->zap_dbuf->db_size;
+ mzp = kmem_alloc(sz, KM_SLEEP);
+ bcopy(zap->zap_dbuf->db_data, mzp, sz);
+ nchunks = zap->zap_m.zap_num_chunks;
+
+ err = dmu_object_set_blocksize(zap->zap_objset, zap->zap_object,
+ 1ULL << fzap_default_block_shift, 0, tx);
+ if (err) {
+ kmem_free(mzp, sz);
+ return (err);
+ }
+
+ dprintf("upgrading obj=%llu with %u chunks\n",
+ zap->zap_object, nchunks);
+ /* XXX destroy the avl later, so we can use the stored hash value */
+ mze_destroy(zap);
+
+ fzap_upgrade(zap, tx);
+
+ for (i = 0; i < nchunks; i++) {
+ int err;
+ mzap_ent_phys_t *mze = &mzp->mz_chunk[i];
+ zap_name_t *zn;
+ if (mze->mze_name[0] == 0)
+ continue;
+ dprintf("adding %s=%llu\n",
+ mze->mze_name, mze->mze_value);
+ zn = zap_name_alloc(zap, mze->mze_name, MT_EXACT);
+ err = fzap_add_cd(zn, 8, 1, &mze->mze_value, mze->mze_cd, tx);
+ zap = zn->zn_zap; /* fzap_add_cd() may change zap */
+ zap_name_free(zn);
+ if (err)
+ break;
+ }
+ kmem_free(mzp, sz);
+ *zapp = zap;
+ return (err);
+}
+
+static void
+mzap_create_impl(objset_t *os, uint64_t obj, int normflags, dmu_tx_t *tx)
+{
+ dmu_buf_t *db;
+ mzap_phys_t *zp;
+
+ VERIFY(0 == dmu_buf_hold(os, obj, 0, FTAG, &db));
+
+#ifdef ZFS_DEBUG
+ {
+ dmu_object_info_t doi;
+ dmu_object_info_from_db(db, &doi);
+ ASSERT(dmu_ot[doi.doi_type].ot_byteswap == zap_byteswap);
+ }
+#endif
+
+ dmu_buf_will_dirty(db, tx);
+ zp = db->db_data;
+ zp->mz_block_type = ZBT_MICRO;
+ zp->mz_salt = ((uintptr_t)db ^ (uintptr_t)tx ^ (obj << 1)) | 1ULL;
+ zp->mz_normflags = normflags;
+ dmu_buf_rele(db, FTAG);
+}
+
+int
+zap_create_claim(objset_t *os, uint64_t obj, dmu_object_type_t ot,
+ dmu_object_type_t bonustype, int bonuslen, dmu_tx_t *tx)
+{
+ return (zap_create_claim_norm(os, obj,
+ 0, ot, bonustype, bonuslen, tx));
+}
+
+int
+zap_create_claim_norm(objset_t *os, uint64_t obj, int normflags,
+ dmu_object_type_t ot,
+ dmu_object_type_t bonustype, int bonuslen, dmu_tx_t *tx)
+{
+ int err;
+
+ err = dmu_object_claim(os, obj, ot, 0, bonustype, bonuslen, tx);
+ if (err != 0)
+ return (err);
+ mzap_create_impl(os, obj, normflags, tx);
+ return (0);
+}
+
+uint64_t
+zap_create(objset_t *os, dmu_object_type_t ot,
+ dmu_object_type_t bonustype, int bonuslen, dmu_tx_t *tx)
+{
+ return (zap_create_norm(os, 0, ot, bonustype, bonuslen, tx));
+}
+
+uint64_t
+zap_create_norm(objset_t *os, int normflags, dmu_object_type_t ot,
+ dmu_object_type_t bonustype, int bonuslen, dmu_tx_t *tx)
+{
+ uint64_t obj = dmu_object_alloc(os, ot, 0, bonustype, bonuslen, tx);
+
+ mzap_create_impl(os, obj, normflags, tx);
+ return (obj);
+}
+
+int
+zap_destroy(objset_t *os, uint64_t zapobj, dmu_tx_t *tx)
+{
+ /*
+ * dmu_object_free will free the object number and free the
+ * data. Freeing the data will cause our pageout function to be
+ * called, which will destroy our data (zap_leaf_t's and zap_t).
+ */
+
+ return (dmu_object_free(os, zapobj, tx));
+}
+
+_NOTE(ARGSUSED(0))
+void
+zap_evict(dmu_buf_t *db, void *vzap)
+{
+ zap_t *zap = vzap;
+
+ rw_destroy(&zap->zap_rwlock);
+
+ if (zap->zap_ismicro)
+ mze_destroy(zap);
+ else
+ mutex_destroy(&zap->zap_f.zap_num_entries_mtx);
+
+ kmem_free(zap, sizeof (zap_t));
+}
+
+int
+zap_count(objset_t *os, uint64_t zapobj, uint64_t *count)
+{
+ zap_t *zap;
+ int err;
+
+ err = zap_lockdir(os, zapobj, NULL, RW_READER, TRUE, FALSE, &zap);
+ if (err)
+ return (err);
+ if (!zap->zap_ismicro) {
+ err = fzap_count(zap, count);
+ } else {
+ *count = zap->zap_m.zap_num_entries;
+ }
+ zap_unlockdir(zap);
+ return (err);
+}
+
+/*
+ * zn may be NULL; if not specified, it will be computed if needed.
+ * See also the comment above zap_entry_normalization_conflict().
+ */
+static boolean_t
+mzap_normalization_conflict(zap_t *zap, zap_name_t *zn, mzap_ent_t *mze)
+{
+ mzap_ent_t *other;
+ int direction = AVL_BEFORE;
+ boolean_t allocdzn = B_FALSE;
+
+ if (zap->zap_normflags == 0)
+ return (B_FALSE);
+
+again:
+ for (other = avl_walk(&zap->zap_m.zap_avl, mze, direction);
+ other && other->mze_hash == mze->mze_hash;
+ other = avl_walk(&zap->zap_m.zap_avl, other, direction)) {
+
+ if (zn == NULL) {
+ zn = zap_name_alloc(zap, mze->mze_phys.mze_name,
+ MT_FIRST);
+ allocdzn = B_TRUE;
+ }
+ if (zap_match(zn, other->mze_phys.mze_name)) {
+ if (allocdzn)
+ zap_name_free(zn);
+ return (B_TRUE);
+ }
+ }
+
+ if (direction == AVL_BEFORE) {
+ direction = AVL_AFTER;
+ goto again;
+ }
+
+ if (allocdzn)
+ zap_name_free(zn);
+ return (B_FALSE);
+}
+
+/*
+ * Routines for manipulating attributes.
+ */
+
+int
+zap_lookup(objset_t *os, uint64_t zapobj, const char *name,
+ uint64_t integer_size, uint64_t num_integers, void *buf)
+{
+ return (zap_lookup_norm(os, zapobj, name, integer_size,
+ num_integers, buf, MT_EXACT, NULL, 0, NULL));
+}
+
+int
+zap_lookup_norm(objset_t *os, uint64_t zapobj, const char *name,
+ uint64_t integer_size, uint64_t num_integers, void *buf,
+ matchtype_t mt, char *realname, int rn_len,
+ boolean_t *ncp)
+{
+ zap_t *zap;
+ int err;
+ mzap_ent_t *mze;
+ zap_name_t *zn;
+
+ err = zap_lockdir(os, zapobj, NULL, RW_READER, TRUE, FALSE, &zap);
+ if (err)
+ return (err);
+ zn = zap_name_alloc(zap, name, mt);
+ if (zn == NULL) {
+ zap_unlockdir(zap);
+ return (ENOTSUP);
+ }
+
+ if (!zap->zap_ismicro) {
+ err = fzap_lookup(zn, integer_size, num_integers, buf,
+ realname, rn_len, ncp);
+ } else {
+ mze = mze_find(zn);
+ if (mze == NULL) {
+ err = ENOENT;
+ } else {
+ if (num_integers < 1) {
+ err = EOVERFLOW;
+ } else if (integer_size != 8) {
+ err = EINVAL;
+ } else {
+ *(uint64_t *)buf = mze->mze_phys.mze_value;
+ (void) strlcpy(realname,
+ mze->mze_phys.mze_name, rn_len);
+ if (ncp) {
+ *ncp = mzap_normalization_conflict(zap,
+ zn, mze);
+ }
+ }
+ }
+ }
+ zap_name_free(zn);
+ zap_unlockdir(zap);
+ return (err);
+}
+
+int
+zap_length(objset_t *os, uint64_t zapobj, const char *name,
+ uint64_t *integer_size, uint64_t *num_integers)
+{
+ zap_t *zap;
+ int err;
+ mzap_ent_t *mze;
+ zap_name_t *zn;
+
+ err = zap_lockdir(os, zapobj, NULL, RW_READER, TRUE, FALSE, &zap);
+ if (err)
+ return (err);
+ zn = zap_name_alloc(zap, name, MT_EXACT);
+ if (zn == NULL) {
+ zap_unlockdir(zap);
+ return (ENOTSUP);
+ }
+ if (!zap->zap_ismicro) {
+ err = fzap_length(zn, integer_size, num_integers);
+ } else {
+ mze = mze_find(zn);
+ if (mze == NULL) {
+ err = ENOENT;
+ } else {
+ if (integer_size)
+ *integer_size = 8;
+ if (num_integers)
+ *num_integers = 1;
+ }
+ }
+ zap_name_free(zn);
+ zap_unlockdir(zap);
+ return (err);
+}
+
+static void
+mzap_addent(zap_name_t *zn, uint64_t value)
+{
+ int i;
+ zap_t *zap = zn->zn_zap;
+ int start = zap->zap_m.zap_alloc_next;
+ uint32_t cd;
+
+ dprintf("obj=%llu %s=%llu\n", zap->zap_object,
+ zn->zn_name_orij, value);
+ ASSERT(RW_WRITE_HELD(&zap->zap_rwlock));
+
+#ifdef ZFS_DEBUG
+ for (i = 0; i < zap->zap_m.zap_num_chunks; i++) {
+ mzap_ent_phys_t *mze = &zap->zap_m.zap_phys->mz_chunk[i];
+ ASSERT(strcmp(zn->zn_name_orij, mze->mze_name) != 0);
+ }
+#endif
+
+ cd = mze_find_unused_cd(zap, zn->zn_hash);
+ /* given the limited size of the microzap, this can't happen */
+ ASSERT(cd != ZAP_MAXCD);
+
+again:
+ for (i = start; i < zap->zap_m.zap_num_chunks; i++) {
+ mzap_ent_phys_t *mze = &zap->zap_m.zap_phys->mz_chunk[i];
+ if (mze->mze_name[0] == 0) {
+ mze->mze_value = value;
+ mze->mze_cd = cd;
+ (void) strcpy(mze->mze_name, zn->zn_name_orij);
+ zap->zap_m.zap_num_entries++;
+ zap->zap_m.zap_alloc_next = i+1;
+ if (zap->zap_m.zap_alloc_next ==
+ zap->zap_m.zap_num_chunks)
+ zap->zap_m.zap_alloc_next = 0;
+ mze_insert(zap, i, zn->zn_hash, mze);
+ return;
+ }
+ }
+ if (start != 0) {
+ start = 0;
+ goto again;
+ }
+ ASSERT(!"out of entries!");
+}
+
+int
+zap_add(objset_t *os, uint64_t zapobj, const char *name,
+ int integer_size, uint64_t num_integers,
+ const void *val, dmu_tx_t *tx)
+{
+ zap_t *zap;
+ int err;
+ mzap_ent_t *mze;
+ const uint64_t *intval = val;
+ zap_name_t *zn;
+
+ err = zap_lockdir(os, zapobj, tx, RW_WRITER, TRUE, TRUE, &zap);
+ if (err)
+ return (err);
+ zn = zap_name_alloc(zap, name, MT_EXACT);
+ if (zn == NULL) {
+ zap_unlockdir(zap);
+ return (ENOTSUP);
+ }
+ if (!zap->zap_ismicro) {
+ err = fzap_add(zn, integer_size, num_integers, val, tx);
+ zap = zn->zn_zap; /* fzap_add() may change zap */
+ } else if (integer_size != 8 || num_integers != 1 ||
+ strlen(name) >= MZAP_NAME_LEN) {
+ dprintf("upgrading obj %llu: intsz=%u numint=%llu name=%s\n",
+ zapobj, integer_size, num_integers, name);
+ err = mzap_upgrade(&zn->zn_zap, tx);
+ if (err == 0)
+ err = fzap_add(zn, integer_size, num_integers, val, tx);
+ zap = zn->zn_zap; /* fzap_add() may change zap */
+ } else {
+ mze = mze_find(zn);
+ if (mze != NULL) {
+ err = EEXIST;
+ } else {
+ mzap_addent(zn, *intval);
+ }
+ }
+ ASSERT(zap == zn->zn_zap);
+ zap_name_free(zn);
+ if (zap != NULL) /* may be NULL if fzap_add() failed */
+ zap_unlockdir(zap);
+ return (err);
+}
+
+int
+zap_update(objset_t *os, uint64_t zapobj, const char *name,
+ int integer_size, uint64_t num_integers, const void *val, dmu_tx_t *tx)
+{
+ zap_t *zap;
+ mzap_ent_t *mze;
+ const uint64_t *intval = val;
+ zap_name_t *zn;
+ int err;
+
+ err = zap_lockdir(os, zapobj, tx, RW_WRITER, TRUE, TRUE, &zap);
+ if (err)
+ return (err);
+ zn = zap_name_alloc(zap, name, MT_EXACT);
+ if (zn == NULL) {
+ zap_unlockdir(zap);
+ return (ENOTSUP);
+ }
+ if (!zap->zap_ismicro) {
+ err = fzap_update(zn, integer_size, num_integers, val, tx);
+ zap = zn->zn_zap; /* fzap_update() may change zap */
+ } else if (integer_size != 8 || num_integers != 1 ||
+ strlen(name) >= MZAP_NAME_LEN) {
+ dprintf("upgrading obj %llu: intsz=%u numint=%llu name=%s\n",
+ zapobj, integer_size, num_integers, name);
+ err = mzap_upgrade(&zn->zn_zap, tx);
+ if (err == 0)
+ err = fzap_update(zn, integer_size, num_integers,
+ val, tx);
+ zap = zn->zn_zap; /* fzap_update() may change zap */
+ } else {
+ mze = mze_find(zn);
+ if (mze != NULL) {
+ mze->mze_phys.mze_value = *intval;
+ zap->zap_m.zap_phys->mz_chunk
+ [mze->mze_chunkid].mze_value = *intval;
+ } else {
+ mzap_addent(zn, *intval);
+ }
+ }
+ ASSERT(zap == zn->zn_zap);
+ zap_name_free(zn);
+ if (zap != NULL) /* may be NULL if fzap_upgrade() failed */
+ zap_unlockdir(zap);
+ return (err);
+}
+
+int
+zap_remove(objset_t *os, uint64_t zapobj, const char *name, dmu_tx_t *tx)
+{
+ return (zap_remove_norm(os, zapobj, name, MT_EXACT, tx));
+}
+
+int
+zap_remove_norm(objset_t *os, uint64_t zapobj, const char *name,
+ matchtype_t mt, dmu_tx_t *tx)
+{
+ zap_t *zap;
+ int err;
+ mzap_ent_t *mze;
+ zap_name_t *zn;
+
+ err = zap_lockdir(os, zapobj, tx, RW_WRITER, TRUE, FALSE, &zap);
+ if (err)
+ return (err);
+ zn = zap_name_alloc(zap, name, mt);
+ if (zn == NULL) {
+ zap_unlockdir(zap);
+ return (ENOTSUP);
+ }
+ if (!zap->zap_ismicro) {
+ err = fzap_remove(zn, tx);
+ } else {
+ mze = mze_find(zn);
+ if (mze == NULL) {
+ err = ENOENT;
+ } else {
+ zap->zap_m.zap_num_entries--;
+ bzero(&zap->zap_m.zap_phys->mz_chunk[mze->mze_chunkid],
+ sizeof (mzap_ent_phys_t));
+ mze_remove(zap, mze);
+ }
+ }
+ zap_name_free(zn);
+ zap_unlockdir(zap);
+ return (err);
+}
+
+/*
+ * Routines for iterating over the attributes.
+ */
+
+/*
+ * We want to keep the high 32 bits of the cursor zero if we can, so
+ * that 32-bit programs can access this. So use a small hash value so
+ * we can fit 4 bits of cd into the 32-bit cursor.
+ *
+ * [ 4 zero bits | 32-bit collision differentiator | 28-bit hash value ]
+ */
+void
+zap_cursor_init_serialized(zap_cursor_t *zc, objset_t *os, uint64_t zapobj,
+ uint64_t serialized)
+{
+ zc->zc_objset = os;
+ zc->zc_zap = NULL;
+ zc->zc_leaf = NULL;
+ zc->zc_zapobj = zapobj;
+ if (serialized == -1ULL) {
+ zc->zc_hash = -1ULL;
+ zc->zc_cd = 0;
+ } else {
+ zc->zc_hash = serialized << (64-ZAP_HASHBITS);
+ zc->zc_cd = serialized >> ZAP_HASHBITS;
+ if (zc->zc_cd >= ZAP_MAXCD) /* corrupt serialized */
+ zc->zc_cd = 0;
+ }
+}
+
+void
+zap_cursor_init(zap_cursor_t *zc, objset_t *os, uint64_t zapobj)
+{
+ zap_cursor_init_serialized(zc, os, zapobj, 0);
+}
+
+void
+zap_cursor_fini(zap_cursor_t *zc)
+{
+ if (zc->zc_zap) {
+ rw_enter(&zc->zc_zap->zap_rwlock, RW_READER);
+ zap_unlockdir(zc->zc_zap);
+ zc->zc_zap = NULL;
+ }
+ if (zc->zc_leaf) {
+ rw_enter(&zc->zc_leaf->l_rwlock, RW_READER);
+ zap_put_leaf(zc->zc_leaf);
+ zc->zc_leaf = NULL;
+ }
+ zc->zc_objset = NULL;
+}
+
+uint64_t
+zap_cursor_serialize(zap_cursor_t *zc)
+{
+ if (zc->zc_hash == -1ULL)
+ return (-1ULL);
+ ASSERT((zc->zc_hash & (ZAP_MAXCD-1)) == 0);
+ ASSERT(zc->zc_cd < ZAP_MAXCD);
+ return ((zc->zc_hash >> (64-ZAP_HASHBITS)) |
+ ((uint64_t)zc->zc_cd << ZAP_HASHBITS));
+}
+
+int
+zap_cursor_retrieve(zap_cursor_t *zc, zap_attribute_t *za)
+{
+ int err;
+ avl_index_t idx;
+ mzap_ent_t mze_tofind;
+ mzap_ent_t *mze;
+
+ if (zc->zc_hash == -1ULL)
+ return (ENOENT);
+
+ if (zc->zc_zap == NULL) {
+ err = zap_lockdir(zc->zc_objset, zc->zc_zapobj, NULL,
+ RW_READER, TRUE, FALSE, &zc->zc_zap);
+ if (err)
+ return (err);
+ } else {
+ rw_enter(&zc->zc_zap->zap_rwlock, RW_READER);
+ }
+ if (!zc->zc_zap->zap_ismicro) {
+ err = fzap_cursor_retrieve(zc->zc_zap, zc, za);
+ } else {
+ err = ENOENT;
+
+ mze_tofind.mze_hash = zc->zc_hash;
+ mze_tofind.mze_phys.mze_cd = zc->zc_cd;
+
+ mze = avl_find(&zc->zc_zap->zap_m.zap_avl, &mze_tofind, &idx);
+ if (mze == NULL) {
+ mze = avl_nearest(&zc->zc_zap->zap_m.zap_avl,
+ idx, AVL_AFTER);
+ }
+ if (mze) {
+ ASSERT(0 == bcmp(&mze->mze_phys,
+ &zc->zc_zap->zap_m.zap_phys->mz_chunk
+ [mze->mze_chunkid], sizeof (mze->mze_phys)));
+
+ za->za_normalization_conflict =
+ mzap_normalization_conflict(zc->zc_zap, NULL, mze);
+ za->za_integer_length = 8;
+ za->za_num_integers = 1;
+ za->za_first_integer = mze->mze_phys.mze_value;
+ (void) strcpy(za->za_name, mze->mze_phys.mze_name);
+ zc->zc_hash = mze->mze_hash;
+ zc->zc_cd = mze->mze_phys.mze_cd;
+ err = 0;
+ } else {
+ zc->zc_hash = -1ULL;
+ }
+ }
+ rw_exit(&zc->zc_zap->zap_rwlock);
+ return (err);
+}
+
+void
+zap_cursor_advance(zap_cursor_t *zc)
+{
+ if (zc->zc_hash == -1ULL)
+ return;
+ zc->zc_cd++;
+ if (zc->zc_cd >= ZAP_MAXCD) {
+ zc->zc_cd = 0;
+ zc->zc_hash += 1ULL<<(64-ZAP_HASHBITS);
+ if (zc->zc_hash == 0) /* EOF */
+ zc->zc_hash = -1ULL;
+ }
+}
+
+int
+zap_get_stats(objset_t *os, uint64_t zapobj, zap_stats_t *zs)
+{
+ int err;
+ zap_t *zap;
+
+ err = zap_lockdir(os, zapobj, NULL, RW_READER, TRUE, FALSE, &zap);
+ if (err)
+ return (err);
+
+ bzero(zs, sizeof (zap_stats_t));
+
+ if (zap->zap_ismicro) {
+ zs->zs_blocksize = zap->zap_dbuf->db_size;
+ zs->zs_num_entries = zap->zap_m.zap_num_entries;
+ zs->zs_num_blocks = 1;
+ } else {
+ fzap_get_stats(zap, zs);
+ }
+ zap_unlockdir(zap);
+ return (0);
+}
git://git.camperquake.de / zfs.git / blobdiff