diff options
Diffstat (limited to 'uts/common/fs/zfs/zap_micro.c')
| -rw-r--r-- | uts/common/fs/zfs/zap_micro.c | 1455 |
1 files changed, 1455 insertions, 0 deletions
diff --git a/uts/common/fs/zfs/zap_micro.c b/uts/common/fs/zfs/zap_micro.c new file mode 100644 index 000000000000..2d89c20c47d7 --- /dev/null +++ b/uts/common/fs/zfs/zap_micro.c @@ -0,0 +1,1455 @@ +/* + * 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 (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved. + */ + +#include <sys/zio.h> +#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> +#include <sys/arc.h> + +#ifdef _KERNEL +#include <sys/sunddi.h> +#endif + +static int mzap_upgrade(zap_t **zapp, dmu_tx_t *tx, zap_flags_t flags); + +uint64_t +zap_getflags(zap_t *zap) +{ + if (zap->zap_ismicro) + return (0); + return (zap->zap_u.zap_fat.zap_phys->zap_flags); +} + +int +zap_hashbits(zap_t *zap) +{ + if (zap_getflags(zap) & ZAP_FLAG_HASH64) + return (48); + else + return (28); +} + +uint32_t +zap_maxcd(zap_t *zap) +{ + if (zap_getflags(zap) & ZAP_FLAG_HASH64) + return ((1<<16)-1); + else + return (-1U); +} + +static uint64_t +zap_hash(zap_name_t *zn) +{ + zap_t *zap = zn->zn_zap; + uint64_t h = 0; + + if (zap_getflags(zap) & ZAP_FLAG_PRE_HASHED_KEY) { + ASSERT(zap_getflags(zap) & ZAP_FLAG_UINT64_KEY); + h = *(uint64_t *)zn->zn_key_orig; + } else { + h = zap->zap_salt; + ASSERT(h != 0); + ASSERT(zfs_crc64_table[128] == ZFS_CRC64_POLY); + + if (zap_getflags(zap) & ZAP_FLAG_UINT64_KEY) { + int i; + const uint64_t *wp = zn->zn_key_norm; + + ASSERT(zn->zn_key_intlen == 8); + for (i = 0; i < zn->zn_key_norm_numints; wp++, i++) { + int j; + uint64_t word = *wp; + + for (j = 0; j < zn->zn_key_intlen; j++) { + h = (h >> 8) ^ + zfs_crc64_table[(h ^ word) & 0xFF]; + word >>= NBBY; + } + } + } else { + int i, len; + const uint8_t *cp = zn->zn_key_norm; + + /* + * We previously stored the terminating null on + * disk, but didn't hash it, so we need to + * continue to not hash it. (The + * zn_key_*_numints includes the terminating + * null for non-binary keys.) + */ + len = zn->zn_key_norm_numints - 1; + + ASSERT(zn->zn_key_intlen == 1); + for (i = 0; i < len; cp++, i++) { + h = (h >> 8) ^ + zfs_crc64_table[(h ^ *cp) & 0xFF]; + } + } + } + /* + * Don't use all 64 bits, since we need some 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. + */ + h &= ~((1ULL << (64 - zap_hashbits(zap))) - 1); + + return (h); +} + +static int +zap_normalize(zap_t *zap, const char *name, char *namenorm) +{ + size_t inlen, outlen; + int err; + + ASSERT(!(zap_getflags(zap) & ZAP_FLAG_UINT64_KEY)); + + 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_TEXTPREP_IGNORE_INVALID, U8_UNICODE_LATEST, &err); + + return (err); +} + +boolean_t +zap_match(zap_name_t *zn, const char *matchname) +{ + ASSERT(!(zap_getflags(zn->zn_zap) & ZAP_FLAG_UINT64_KEY)); + + 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_key_norm, norm) == 0); + } else { + /* MT_BEST or MT_EXACT */ + return (strcmp(zn->zn_key_orig, matchname) == 0); + } +} + +void +zap_name_free(zap_name_t *zn) +{ + kmem_free(zn, sizeof (zap_name_t)); +} + +zap_name_t * +zap_name_alloc(zap_t *zap, const char *key, matchtype_t mt) +{ + zap_name_t *zn = kmem_alloc(sizeof (zap_name_t), KM_SLEEP); + + zn->zn_zap = zap; + zn->zn_key_intlen = sizeof (*key); + zn->zn_key_orig = key; + zn->zn_key_orig_numints = strlen(zn->zn_key_orig) + 1; + zn->zn_matchtype = mt; + if (zap->zap_normflags) { + if (zap_normalize(zap, key, zn->zn_normbuf) != 0) { + zap_name_free(zn); + return (NULL); + } + zn->zn_key_norm = zn->zn_normbuf; + zn->zn_key_norm_numints = strlen(zn->zn_key_norm) + 1; + } else { + if (mt != MT_EXACT) { + zap_name_free(zn); + return (NULL); + } + zn->zn_key_norm = zn->zn_key_orig; + zn->zn_key_norm_numints = zn->zn_key_orig_numints; + } + + zn->zn_hash = zap_hash(zn); + return (zn); +} + +zap_name_t * +zap_name_alloc_uint64(zap_t *zap, const uint64_t *key, int numints) +{ + zap_name_t *zn = kmem_alloc(sizeof (zap_name_t), KM_SLEEP); + + ASSERT(zap->zap_normflags == 0); + zn->zn_zap = zap; + zn->zn_key_intlen = sizeof (*key); + zn->zn_key_orig = zn->zn_key_norm = key; + zn->zn_key_orig_numints = zn->zn_key_norm_numints = numints; + zn->zn_matchtype = MT_EXACT; + + zn->zn_hash = zap_hash(zn); + 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_cd > mze2->mze_cd) + return (+1); + if (mze1->mze_cd < mze2->mze_cd) + return (-1); + return (0); +} + +static void +mze_insert(zap_t *zap, int chunkid, uint64_t hash) +{ + mzap_ent_t *mze; + + ASSERT(zap->zap_ismicro); + ASSERT(RW_WRITE_HELD(&zap->zap_rwlock)); + + mze = kmem_alloc(sizeof (mzap_ent_t), KM_SLEEP); + mze->mze_chunkid = chunkid; + mze->mze_hash = hash; + mze->mze_cd = MZE_PHYS(zap, mze)->mze_cd; + ASSERT(MZE_PHYS(zap, mze)->mze_name[0] != 0); + 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)); + + mze_tofind.mze_hash = zn->zn_hash; + mze_tofind.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)) { + ASSERT3U(mze->mze_cd, ==, MZE_PHYS(zn->zn_zap, mze)->mze_cd); + if (zap_match(zn, MZE_PHYS(zn->zn_zap, mze)->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_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_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); + 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, DMU_READ_NO_PREFETCH); + 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, 0)); + } + 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, zap_flags_t flags) +{ + mzap_phys_t *mzp; + int i, sz, nchunks; + int err = 0; + 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; + + if (!flags) { + 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, flags); + + for (i = 0; i < nchunks; i++) { + 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, zap_flags_t flags, + dmu_tx_t *tx) +{ + dmu_buf_t *db; + mzap_phys_t *zp; + + VERIFY(0 == dmu_buf_hold(os, obj, 0, FTAG, &db, DMU_READ_NO_PREFETCH)); + +#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); + + if (flags != 0) { + zap_t *zap; + /* Only fat zap supports flags; upgrade immediately. */ + VERIFY(0 == zap_lockdir(os, obj, tx, RW_WRITER, + B_FALSE, B_FALSE, &zap)); + VERIFY3U(0, ==, mzap_upgrade(&zap, tx, flags)); + zap_unlockdir(zap); + } +} + +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, 0, 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, 0, tx); + return (obj); +} + +uint64_t +zap_create_flags(objset_t *os, int normflags, zap_flags_t flags, + dmu_object_type_t ot, int leaf_blockshift, int indirect_blockshift, + dmu_object_type_t bonustype, int bonuslen, dmu_tx_t *tx) +{ + uint64_t obj = dmu_object_alloc(os, ot, 0, bonustype, bonuslen, tx); + + ASSERT(leaf_blockshift >= SPA_MINBLOCKSHIFT && + leaf_blockshift <= SPA_MAXBLOCKSHIFT && + indirect_blockshift >= SPA_MINBLOCKSHIFT && + indirect_blockshift <= SPA_MAXBLOCKSHIFT); + + VERIFY(dmu_object_set_blocksize(os, obj, + 1ULL << leaf_blockshift, indirect_blockshift, tx) == 0); + + mzap_create_impl(os, obj, normflags, flags, 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_PHYS(zap, mze)->mze_name, + MT_FIRST); + allocdzn = B_TRUE; + } + if (zap_match(zn, MZE_PHYS(zap, other)->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_PHYS(zap, mze)->mze_value; + (void) strlcpy(realname, + MZE_PHYS(zap, mze)->mze_name, rn_len); + if (ncp) { + *ncp = mzap_normalization_conflict(zap, + zn, mze); + } + } + } + } + zap_name_free(zn); + zap_unlockdir(zap); + return (err); +} + +int +zap_prefetch_uint64(objset_t *os, uint64_t zapobj, const uint64_t *key, + int key_numints) +{ + zap_t *zap; + int err; + zap_name_t *zn; + + err = zap_lockdir(os, zapobj, NULL, RW_READER, TRUE, FALSE, &zap); + if (err) + return (err); + zn = zap_name_alloc_uint64(zap, key, key_numints); + if (zn == NULL) { + zap_unlockdir(zap); + return (ENOTSUP); + } + + fzap_prefetch(zn); + zap_name_free(zn); + zap_unlockdir(zap); + return (err); +} + +int +zap_lookup_uint64(objset_t *os, uint64_t zapobj, const uint64_t *key, + int key_numints, uint64_t integer_size, uint64_t num_integers, void *buf) +{ + zap_t *zap; + int err; + zap_name_t *zn; + + err = zap_lockdir(os, zapobj, NULL, RW_READER, TRUE, FALSE, &zap); + if (err) + return (err); + zn = zap_name_alloc_uint64(zap, key, key_numints); + if (zn == NULL) { + zap_unlockdir(zap); + return (ENOTSUP); + } + + err = fzap_lookup(zn, integer_size, num_integers, buf, + NULL, 0, NULL); + zap_name_free(zn); + zap_unlockdir(zap); + return (err); +} + +int +zap_contains(objset_t *os, uint64_t zapobj, const char *name) +{ + int err = (zap_lookup_norm(os, zapobj, name, 0, + 0, NULL, MT_EXACT, NULL, 0, NULL)); + if (err == EOVERFLOW || err == EINVAL) + err = 0; /* found, but skipped reading the value */ + 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); +} + +int +zap_length_uint64(objset_t *os, uint64_t zapobj, const uint64_t *key, + int key_numints, uint64_t *integer_size, uint64_t *num_integers) +{ + zap_t *zap; + int err; + zap_name_t *zn; + + err = zap_lockdir(os, zapobj, NULL, RW_READER, TRUE, FALSE, &zap); + if (err) + return (err); + zn = zap_name_alloc_uint64(zap, key, key_numints); + if (zn == NULL) { + zap_unlockdir(zap); + return (ENOTSUP); + } + err = fzap_length(zn, integer_size, num_integers); + 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; + + 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_key_orig, 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(zap)); + +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_key_orig); + 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); + return; + } + } + if (start != 0) { + start = 0; + goto again; + } + ASSERT(!"out of entries!"); +} + +int +zap_add(objset_t *os, uint64_t zapobj, const char *key, + 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, key, 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(key) >= MZAP_NAME_LEN) { + err = mzap_upgrade(&zn->zn_zap, tx, 0); + 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_add_uint64(objset_t *os, uint64_t zapobj, const uint64_t *key, + int key_numints, int integer_size, uint64_t num_integers, + const void *val, dmu_tx_t *tx) +{ + zap_t *zap; + int err; + zap_name_t *zn; + + err = zap_lockdir(os, zapobj, tx, RW_WRITER, TRUE, TRUE, &zap); + if (err) + return (err); + zn = zap_name_alloc_uint64(zap, key, key_numints); + if (zn == NULL) { + zap_unlockdir(zap); + return (ENOTSUP); + } + err = fzap_add(zn, integer_size, num_integers, val, tx); + zap = zn->zn_zap; /* fzap_add() may change 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; + uint64_t oldval; + const uint64_t *intval = val; + zap_name_t *zn; + int err; + +#ifdef ZFS_DEBUG + /* + * If there is an old value, it shouldn't change across the + * lockdir (eg, due to bprewrite's xlation). + */ + if (integer_size == 8 && num_integers == 1) + (void) zap_lookup(os, zapobj, name, 8, 1, &oldval); +#endif + + 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, 0); + 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) { + ASSERT3U(MZE_PHYS(zap, mze)->mze_value, ==, oldval); + MZE_PHYS(zap, mze)->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_update_uint64(objset_t *os, uint64_t zapobj, const uint64_t *key, + int key_numints, + int integer_size, uint64_t num_integers, const void *val, dmu_tx_t *tx) +{ + zap_t *zap; + 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_uint64(zap, key, key_numints); + if (zn == NULL) { + zap_unlockdir(zap); + return (ENOTSUP); + } + err = fzap_update(zn, integer_size, num_integers, val, tx); + zap = zn->zn_zap; /* fzap_update() may change 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); +} + +int +zap_remove_uint64(objset_t *os, uint64_t zapobj, const uint64_t *key, + int key_numints, dmu_tx_t *tx) +{ + zap_t *zap; + int err; + zap_name_t *zn; + + err = zap_lockdir(os, zapobj, tx, RW_WRITER, TRUE, FALSE, &zap); + if (err) + return (err); + zn = zap_name_alloc_uint64(zap, key, key_numints); + if (zn == NULL) { + zap_unlockdir(zap); + return (ENOTSUP); + } + err = fzap_remove(zn, tx); + zap_name_free(zn); + zap_unlockdir(zap); + return (err); +} + +/* + * Routines for iterating over the attributes. + */ + +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; + zc->zc_serialized = serialized; + zc->zc_hash = 0; + 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); + if (zc->zc_zap == NULL) + return (zc->zc_serialized); + ASSERT((zc->zc_hash & zap_maxcd(zc->zc_zap)) == 0); + ASSERT(zc->zc_cd < zap_maxcd(zc->zc_zap)); + + /* + * We want to keep the high 32 bits of the cursor zero if we can, so + * that 32-bit programs can access this. So usually use a small + * (28-bit) hash value so we can fit 4 bits of cd into the low 32-bits + * of the cursor. + * + * [ collision differentiator | zap_hashbits()-bit hash value ] + */ + return ((zc->zc_hash >> (64 - zap_hashbits(zc->zc_zap))) | + ((uint64_t)zc->zc_cd << zap_hashbits(zc->zc_zap))); +} + +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) { + int hb; + err = zap_lockdir(zc->zc_objset, zc->zc_zapobj, NULL, + RW_READER, TRUE, FALSE, &zc->zc_zap); + if (err) + return (err); + + /* + * To support zap_cursor_init_serialized, advance, retrieve, + * we must add to the existing zc_cd, which may already + * be 1 due to the zap_cursor_advance. + */ + ASSERT(zc->zc_hash == 0); + hb = zap_hashbits(zc->zc_zap); + zc->zc_hash = zc->zc_serialized << (64 - hb); + zc->zc_cd += zc->zc_serialized >> hb; + if (zc->zc_cd >= zap_maxcd(zc->zc_zap)) /* corrupt serialized */ + zc->zc_cd = 0; + } 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_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) { + mzap_ent_phys_t *mzep = MZE_PHYS(zc->zc_zap, mze); + ASSERT3U(mze->mze_cd, ==, mzep->mze_cd); + 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 = mzep->mze_value; + (void) strcpy(za->za_name, mzep->mze_name); + zc->zc_hash = mze->mze_hash; + zc->zc_cd = mze->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++; +} + +int +zap_cursor_move_to_key(zap_cursor_t *zc, const char *name, matchtype_t mt) +{ + int err = 0; + mzap_ent_t *mze; + zap_name_t *zn; + + 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); + } + + zn = zap_name_alloc(zc->zc_zap, name, mt); + if (zn == NULL) { + rw_exit(&zc->zc_zap->zap_rwlock); + return (ENOTSUP); + } + + if (!zc->zc_zap->zap_ismicro) { + err = fzap_cursor_move_to_key(zc, zn); + } else { + mze = mze_find(zn); + if (mze == NULL) { + err = ENOENT; + goto out; + } + zc->zc_hash = mze->mze_hash; + zc->zc_cd = mze->mze_cd; + } + +out: + zap_name_free(zn); + rw_exit(&zc->zc_zap->zap_rwlock); + return (err); +} + +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); +} + +int +zap_count_write(objset_t *os, uint64_t zapobj, const char *name, int add, + uint64_t *towrite, uint64_t *tooverwrite) +{ + zap_t *zap; + int err = 0; + + + /* + * Since, we don't have a name, we cannot figure out which blocks will + * be affected in this operation. So, account for the worst case : + * - 3 blocks overwritten: target leaf, ptrtbl block, header block + * - 4 new blocks written if adding: + * - 2 blocks for possibly split leaves, + * - 2 grown ptrtbl blocks + * + * This also accomodates the case where an add operation to a fairly + * large microzap results in a promotion to fatzap. + */ + if (name == NULL) { + *towrite += (3 + (add ? 4 : 0)) * SPA_MAXBLOCKSIZE; + return (err); + } + + /* + * We lock the zap with adding == FALSE. Because, if we pass + * the actual value of add, it could trigger a mzap_upgrade(). + * At present we are just evaluating the possibility of this operation + * and hence we donot want to trigger an upgrade. + */ + err = zap_lockdir(os, zapobj, NULL, RW_READER, TRUE, FALSE, &zap); + if (err) + return (err); + + if (!zap->zap_ismicro) { + zap_name_t *zn = zap_name_alloc(zap, name, MT_EXACT); + if (zn) { + err = fzap_count_write(zn, add, towrite, + tooverwrite); + zap_name_free(zn); + } else { + /* + * We treat this case as similar to (name == NULL) + */ + *towrite += (3 + (add ? 4 : 0)) * SPA_MAXBLOCKSIZE; + } + } else { + /* + * We are here if (name != NULL) and this is a micro-zap. + * We account for the header block depending on whether it + * is freeable. + * + * Incase of an add-operation it is hard to find out + * if this add will promote this microzap to fatzap. + * Hence, we consider the worst case and account for the + * blocks assuming this microzap would be promoted to a + * fatzap. + * + * 1 block overwritten : header block + * 4 new blocks written : 2 new split leaf, 2 grown + * ptrtbl blocks + */ + if (dmu_buf_freeable(zap->zap_dbuf)) + *tooverwrite += SPA_MAXBLOCKSIZE; + else + *towrite += SPA_MAXBLOCKSIZE; + + if (add) { + *towrite += 4 * SPA_MAXBLOCKSIZE; + } + } + + zap_unlockdir(zap); + return (err); +} |