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Diffstat (limited to 'uts/common/fs/zfs/zap_leaf.c')
-rw-r--r--uts/common/fs/zfs/zap_leaf.c872
1 files changed, 872 insertions, 0 deletions
diff --git a/uts/common/fs/zfs/zap_leaf.c b/uts/common/fs/zfs/zap_leaf.c
new file mode 100644
index 000000000000..19a795db825b
--- /dev/null
+++ b/uts/common/fs/zfs/zap_leaf.c
@@ -0,0 +1,872 @@
+/*
+ * 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.
+ */
+
+/*
+ * The 512-byte leaf is broken into 32 16-byte chunks.
+ * chunk number n means l_chunk[n], even though the header precedes it.
+ * the names are stored null-terminated.
+ */
+
+#include <sys/zio.h>
+#include <sys/spa.h>
+#include <sys/dmu.h>
+#include <sys/zfs_context.h>
+#include <sys/fs/zfs.h>
+#include <sys/zap.h>
+#include <sys/zap_impl.h>
+#include <sys/zap_leaf.h>
+#include <sys/arc.h>
+
+static uint16_t *zap_leaf_rehash_entry(zap_leaf_t *l, uint16_t entry);
+
+#define CHAIN_END 0xffff /* end of the chunk chain */
+
+/* half the (current) minimum block size */
+#define MAX_ARRAY_BYTES (8<<10)
+
+#define LEAF_HASH(l, h) \
+ ((ZAP_LEAF_HASH_NUMENTRIES(l)-1) & \
+ ((h) >> (64 - ZAP_LEAF_HASH_SHIFT(l)-(l)->l_phys->l_hdr.lh_prefix_len)))
+
+#define LEAF_HASH_ENTPTR(l, h) (&(l)->l_phys->l_hash[LEAF_HASH(l, h)])
+
+
+static void
+zap_memset(void *a, int c, size_t n)
+{
+ char *cp = a;
+ char *cpend = cp + n;
+
+ while (cp < cpend)
+ *cp++ = c;
+}
+
+static void
+stv(int len, void *addr, uint64_t value)
+{
+ switch (len) {
+ case 1:
+ *(uint8_t *)addr = value;
+ return;
+ case 2:
+ *(uint16_t *)addr = value;
+ return;
+ case 4:
+ *(uint32_t *)addr = value;
+ return;
+ case 8:
+ *(uint64_t *)addr = value;
+ return;
+ }
+ ASSERT(!"bad int len");
+}
+
+static uint64_t
+ldv(int len, const void *addr)
+{
+ switch (len) {
+ case 1:
+ return (*(uint8_t *)addr);
+ case 2:
+ return (*(uint16_t *)addr);
+ case 4:
+ return (*(uint32_t *)addr);
+ case 8:
+ return (*(uint64_t *)addr);
+ }
+ ASSERT(!"bad int len");
+ return (0xFEEDFACEDEADBEEFULL);
+}
+
+void
+zap_leaf_byteswap(zap_leaf_phys_t *buf, int size)
+{
+ int i;
+ zap_leaf_t l;
+ l.l_bs = highbit(size)-1;
+ l.l_phys = buf;
+
+ buf->l_hdr.lh_block_type = BSWAP_64(buf->l_hdr.lh_block_type);
+ buf->l_hdr.lh_prefix = BSWAP_64(buf->l_hdr.lh_prefix);
+ buf->l_hdr.lh_magic = BSWAP_32(buf->l_hdr.lh_magic);
+ buf->l_hdr.lh_nfree = BSWAP_16(buf->l_hdr.lh_nfree);
+ buf->l_hdr.lh_nentries = BSWAP_16(buf->l_hdr.lh_nentries);
+ buf->l_hdr.lh_prefix_len = BSWAP_16(buf->l_hdr.lh_prefix_len);
+ buf->l_hdr.lh_freelist = BSWAP_16(buf->l_hdr.lh_freelist);
+
+ for (i = 0; i < ZAP_LEAF_HASH_NUMENTRIES(&l); i++)
+ buf->l_hash[i] = BSWAP_16(buf->l_hash[i]);
+
+ for (i = 0; i < ZAP_LEAF_NUMCHUNKS(&l); i++) {
+ zap_leaf_chunk_t *lc = &ZAP_LEAF_CHUNK(&l, i);
+ struct zap_leaf_entry *le;
+
+ switch (lc->l_free.lf_type) {
+ case ZAP_CHUNK_ENTRY:
+ le = &lc->l_entry;
+
+ le->le_type = BSWAP_8(le->le_type);
+ le->le_value_intlen = BSWAP_8(le->le_value_intlen);
+ le->le_next = BSWAP_16(le->le_next);
+ le->le_name_chunk = BSWAP_16(le->le_name_chunk);
+ le->le_name_numints = BSWAP_16(le->le_name_numints);
+ le->le_value_chunk = BSWAP_16(le->le_value_chunk);
+ le->le_value_numints = BSWAP_16(le->le_value_numints);
+ le->le_cd = BSWAP_32(le->le_cd);
+ le->le_hash = BSWAP_64(le->le_hash);
+ break;
+ case ZAP_CHUNK_FREE:
+ lc->l_free.lf_type = BSWAP_8(lc->l_free.lf_type);
+ lc->l_free.lf_next = BSWAP_16(lc->l_free.lf_next);
+ break;
+ case ZAP_CHUNK_ARRAY:
+ lc->l_array.la_type = BSWAP_8(lc->l_array.la_type);
+ lc->l_array.la_next = BSWAP_16(lc->l_array.la_next);
+ /* la_array doesn't need swapping */
+ break;
+ default:
+ ASSERT(!"bad leaf type");
+ }
+ }
+}
+
+void
+zap_leaf_init(zap_leaf_t *l, boolean_t sort)
+{
+ int i;
+
+ l->l_bs = highbit(l->l_dbuf->db_size)-1;
+ zap_memset(&l->l_phys->l_hdr, 0, sizeof (struct zap_leaf_header));
+ zap_memset(l->l_phys->l_hash, CHAIN_END, 2*ZAP_LEAF_HASH_NUMENTRIES(l));
+ for (i = 0; i < ZAP_LEAF_NUMCHUNKS(l); i++) {
+ ZAP_LEAF_CHUNK(l, i).l_free.lf_type = ZAP_CHUNK_FREE;
+ ZAP_LEAF_CHUNK(l, i).l_free.lf_next = i+1;
+ }
+ ZAP_LEAF_CHUNK(l, ZAP_LEAF_NUMCHUNKS(l)-1).l_free.lf_next = CHAIN_END;
+ l->l_phys->l_hdr.lh_block_type = ZBT_LEAF;
+ l->l_phys->l_hdr.lh_magic = ZAP_LEAF_MAGIC;
+ l->l_phys->l_hdr.lh_nfree = ZAP_LEAF_NUMCHUNKS(l);
+ if (sort)
+ l->l_phys->l_hdr.lh_flags |= ZLF_ENTRIES_CDSORTED;
+}
+
+/*
+ * Routines which manipulate leaf chunks (l_chunk[]).
+ */
+
+static uint16_t
+zap_leaf_chunk_alloc(zap_leaf_t *l)
+{
+ int chunk;
+
+ ASSERT(l->l_phys->l_hdr.lh_nfree > 0);
+
+ chunk = l->l_phys->l_hdr.lh_freelist;
+ ASSERT3U(chunk, <, ZAP_LEAF_NUMCHUNKS(l));
+ ASSERT3U(ZAP_LEAF_CHUNK(l, chunk).l_free.lf_type, ==, ZAP_CHUNK_FREE);
+
+ l->l_phys->l_hdr.lh_freelist = ZAP_LEAF_CHUNK(l, chunk).l_free.lf_next;
+
+ l->l_phys->l_hdr.lh_nfree--;
+
+ return (chunk);
+}
+
+static void
+zap_leaf_chunk_free(zap_leaf_t *l, uint16_t chunk)
+{
+ struct zap_leaf_free *zlf = &ZAP_LEAF_CHUNK(l, chunk).l_free;
+ ASSERT3U(l->l_phys->l_hdr.lh_nfree, <, ZAP_LEAF_NUMCHUNKS(l));
+ ASSERT3U(chunk, <, ZAP_LEAF_NUMCHUNKS(l));
+ ASSERT(zlf->lf_type != ZAP_CHUNK_FREE);
+
+ zlf->lf_type = ZAP_CHUNK_FREE;
+ zlf->lf_next = l->l_phys->l_hdr.lh_freelist;
+ bzero(zlf->lf_pad, sizeof (zlf->lf_pad)); /* help it to compress */
+ l->l_phys->l_hdr.lh_freelist = chunk;
+
+ l->l_phys->l_hdr.lh_nfree++;
+}
+
+/*
+ * Routines which manipulate leaf arrays (zap_leaf_array type chunks).
+ */
+
+static uint16_t
+zap_leaf_array_create(zap_leaf_t *l, const char *buf,
+ int integer_size, int num_integers)
+{
+ uint16_t chunk_head;
+ uint16_t *chunkp = &chunk_head;
+ int byten = 0;
+ uint64_t value;
+ int shift = (integer_size-1)*8;
+ int len = num_integers;
+
+ ASSERT3U(num_integers * integer_size, <, MAX_ARRAY_BYTES);
+
+ while (len > 0) {
+ uint16_t chunk = zap_leaf_chunk_alloc(l);
+ struct zap_leaf_array *la = &ZAP_LEAF_CHUNK(l, chunk).l_array;
+ int i;
+
+ la->la_type = ZAP_CHUNK_ARRAY;
+ for (i = 0; i < ZAP_LEAF_ARRAY_BYTES; i++) {
+ if (byten == 0)
+ value = ldv(integer_size, buf);
+ la->la_array[i] = value >> shift;
+ value <<= 8;
+ if (++byten == integer_size) {
+ byten = 0;
+ buf += integer_size;
+ if (--len == 0)
+ break;
+ }
+ }
+
+ *chunkp = chunk;
+ chunkp = &la->la_next;
+ }
+ *chunkp = CHAIN_END;
+
+ return (chunk_head);
+}
+
+static void
+zap_leaf_array_free(zap_leaf_t *l, uint16_t *chunkp)
+{
+ uint16_t chunk = *chunkp;
+
+ *chunkp = CHAIN_END;
+
+ while (chunk != CHAIN_END) {
+ int nextchunk = ZAP_LEAF_CHUNK(l, chunk).l_array.la_next;
+ ASSERT3U(ZAP_LEAF_CHUNK(l, chunk).l_array.la_type, ==,
+ ZAP_CHUNK_ARRAY);
+ zap_leaf_chunk_free(l, chunk);
+ chunk = nextchunk;
+ }
+}
+
+/* array_len and buf_len are in integers, not bytes */
+static void
+zap_leaf_array_read(zap_leaf_t *l, uint16_t chunk,
+ int array_int_len, int array_len, int buf_int_len, uint64_t buf_len,
+ void *buf)
+{
+ int len = MIN(array_len, buf_len);
+ int byten = 0;
+ uint64_t value = 0;
+ char *p = buf;
+
+ ASSERT3U(array_int_len, <=, buf_int_len);
+
+ /* Fast path for one 8-byte integer */
+ if (array_int_len == 8 && buf_int_len == 8 && len == 1) {
+ struct zap_leaf_array *la = &ZAP_LEAF_CHUNK(l, chunk).l_array;
+ uint8_t *ip = la->la_array;
+ uint64_t *buf64 = buf;
+
+ *buf64 = (uint64_t)ip[0] << 56 | (uint64_t)ip[1] << 48 |
+ (uint64_t)ip[2] << 40 | (uint64_t)ip[3] << 32 |
+ (uint64_t)ip[4] << 24 | (uint64_t)ip[5] << 16 |
+ (uint64_t)ip[6] << 8 | (uint64_t)ip[7];
+ return;
+ }
+
+ /* Fast path for an array of 1-byte integers (eg. the entry name) */
+ if (array_int_len == 1 && buf_int_len == 1 &&
+ buf_len > array_len + ZAP_LEAF_ARRAY_BYTES) {
+ while (chunk != CHAIN_END) {
+ struct zap_leaf_array *la =
+ &ZAP_LEAF_CHUNK(l, chunk).l_array;
+ bcopy(la->la_array, p, ZAP_LEAF_ARRAY_BYTES);
+ p += ZAP_LEAF_ARRAY_BYTES;
+ chunk = la->la_next;
+ }
+ return;
+ }
+
+ while (len > 0) {
+ struct zap_leaf_array *la = &ZAP_LEAF_CHUNK(l, chunk).l_array;
+ int i;
+
+ ASSERT3U(chunk, <, ZAP_LEAF_NUMCHUNKS(l));
+ for (i = 0; i < ZAP_LEAF_ARRAY_BYTES && len > 0; i++) {
+ value = (value << 8) | la->la_array[i];
+ byten++;
+ if (byten == array_int_len) {
+ stv(buf_int_len, p, value);
+ byten = 0;
+ len--;
+ if (len == 0)
+ return;
+ p += buf_int_len;
+ }
+ }
+ chunk = la->la_next;
+ }
+}
+
+static boolean_t
+zap_leaf_array_match(zap_leaf_t *l, zap_name_t *zn,
+ int chunk, int array_numints)
+{
+ int bseen = 0;
+
+ if (zap_getflags(zn->zn_zap) & ZAP_FLAG_UINT64_KEY) {
+ uint64_t *thiskey;
+ boolean_t match;
+
+ ASSERT(zn->zn_key_intlen == sizeof (*thiskey));
+ thiskey = kmem_alloc(array_numints * sizeof (*thiskey),
+ KM_SLEEP);
+
+ zap_leaf_array_read(l, chunk, sizeof (*thiskey), array_numints,
+ sizeof (*thiskey), array_numints, thiskey);
+ match = bcmp(thiskey, zn->zn_key_orig,
+ array_numints * sizeof (*thiskey)) == 0;
+ kmem_free(thiskey, array_numints * sizeof (*thiskey));
+ return (match);
+ }
+
+ ASSERT(zn->zn_key_intlen == 1);
+ if (zn->zn_matchtype == MT_FIRST) {
+ char *thisname = kmem_alloc(array_numints, KM_SLEEP);
+ boolean_t match;
+
+ zap_leaf_array_read(l, chunk, sizeof (char), array_numints,
+ sizeof (char), array_numints, thisname);
+ match = zap_match(zn, thisname);
+ kmem_free(thisname, array_numints);
+ return (match);
+ }
+
+ /*
+ * Fast path for exact matching.
+ * First check that the lengths match, so that we don't read
+ * past the end of the zn_key_orig array.
+ */
+ if (array_numints != zn->zn_key_orig_numints)
+ return (B_FALSE);
+ while (bseen < array_numints) {
+ struct zap_leaf_array *la = &ZAP_LEAF_CHUNK(l, chunk).l_array;
+ int toread = MIN(array_numints - bseen, ZAP_LEAF_ARRAY_BYTES);
+ ASSERT3U(chunk, <, ZAP_LEAF_NUMCHUNKS(l));
+ if (bcmp(la->la_array, (char *)zn->zn_key_orig + bseen, toread))
+ break;
+ chunk = la->la_next;
+ bseen += toread;
+ }
+ return (bseen == array_numints);
+}
+
+/*
+ * Routines which manipulate leaf entries.
+ */
+
+int
+zap_leaf_lookup(zap_leaf_t *l, zap_name_t *zn, zap_entry_handle_t *zeh)
+{
+ uint16_t *chunkp;
+ struct zap_leaf_entry *le;
+
+ ASSERT3U(l->l_phys->l_hdr.lh_magic, ==, ZAP_LEAF_MAGIC);
+
+again:
+ for (chunkp = LEAF_HASH_ENTPTR(l, zn->zn_hash);
+ *chunkp != CHAIN_END; chunkp = &le->le_next) {
+ uint16_t chunk = *chunkp;
+ le = ZAP_LEAF_ENTRY(l, chunk);
+
+ ASSERT3U(chunk, <, ZAP_LEAF_NUMCHUNKS(l));
+ ASSERT3U(le->le_type, ==, ZAP_CHUNK_ENTRY);
+
+ if (le->le_hash != zn->zn_hash)
+ continue;
+
+ /*
+ * NB: the entry chain is always sorted by cd on
+ * normalized zap objects, so this will find the
+ * lowest-cd match for MT_FIRST.
+ */
+ ASSERT(zn->zn_matchtype == MT_EXACT ||
+ (l->l_phys->l_hdr.lh_flags & ZLF_ENTRIES_CDSORTED));
+ if (zap_leaf_array_match(l, zn, le->le_name_chunk,
+ le->le_name_numints)) {
+ zeh->zeh_num_integers = le->le_value_numints;
+ zeh->zeh_integer_size = le->le_value_intlen;
+ zeh->zeh_cd = le->le_cd;
+ zeh->zeh_hash = le->le_hash;
+ zeh->zeh_chunkp = chunkp;
+ zeh->zeh_leaf = l;
+ return (0);
+ }
+ }
+
+ /*
+ * NB: we could of course do this in one pass, but that would be
+ * a pain. We'll see if MT_BEST is even used much.
+ */
+ if (zn->zn_matchtype == MT_BEST) {
+ zn->zn_matchtype = MT_FIRST;
+ goto again;
+ }
+
+ return (ENOENT);
+}
+
+/* Return (h1,cd1 >= h2,cd2) */
+#define HCD_GTEQ(h1, cd1, h2, cd2) \
+ ((h1 > h2) ? TRUE : ((h1 == h2 && cd1 >= cd2) ? TRUE : FALSE))
+
+int
+zap_leaf_lookup_closest(zap_leaf_t *l,
+ uint64_t h, uint32_t cd, zap_entry_handle_t *zeh)
+{
+ uint16_t chunk;
+ uint64_t besth = -1ULL;
+ uint32_t bestcd = -1U;
+ uint16_t bestlh = ZAP_LEAF_HASH_NUMENTRIES(l)-1;
+ uint16_t lh;
+ struct zap_leaf_entry *le;
+
+ ASSERT3U(l->l_phys->l_hdr.lh_magic, ==, ZAP_LEAF_MAGIC);
+
+ for (lh = LEAF_HASH(l, h); lh <= bestlh; lh++) {
+ for (chunk = l->l_phys->l_hash[lh];
+ chunk != CHAIN_END; chunk = le->le_next) {
+ le = ZAP_LEAF_ENTRY(l, chunk);
+
+ ASSERT3U(chunk, <, ZAP_LEAF_NUMCHUNKS(l));
+ ASSERT3U(le->le_type, ==, ZAP_CHUNK_ENTRY);
+
+ if (HCD_GTEQ(le->le_hash, le->le_cd, h, cd) &&
+ HCD_GTEQ(besth, bestcd, le->le_hash, le->le_cd)) {
+ ASSERT3U(bestlh, >=, lh);
+ bestlh = lh;
+ besth = le->le_hash;
+ bestcd = le->le_cd;
+
+ zeh->zeh_num_integers = le->le_value_numints;
+ zeh->zeh_integer_size = le->le_value_intlen;
+ zeh->zeh_cd = le->le_cd;
+ zeh->zeh_hash = le->le_hash;
+ zeh->zeh_fakechunk = chunk;
+ zeh->zeh_chunkp = &zeh->zeh_fakechunk;
+ zeh->zeh_leaf = l;
+ }
+ }
+ }
+
+ return (bestcd == -1U ? ENOENT : 0);
+}
+
+int
+zap_entry_read(const zap_entry_handle_t *zeh,
+ uint8_t integer_size, uint64_t num_integers, void *buf)
+{
+ struct zap_leaf_entry *le =
+ ZAP_LEAF_ENTRY(zeh->zeh_leaf, *zeh->zeh_chunkp);
+ ASSERT3U(le->le_type, ==, ZAP_CHUNK_ENTRY);
+
+ if (le->le_value_intlen > integer_size)
+ return (EINVAL);
+
+ zap_leaf_array_read(zeh->zeh_leaf, le->le_value_chunk,
+ le->le_value_intlen, le->le_value_numints,
+ integer_size, num_integers, buf);
+
+ if (zeh->zeh_num_integers > num_integers)
+ return (EOVERFLOW);
+ return (0);
+
+}
+
+int
+zap_entry_read_name(zap_t *zap, const zap_entry_handle_t *zeh, uint16_t buflen,
+ char *buf)
+{
+ struct zap_leaf_entry *le =
+ ZAP_LEAF_ENTRY(zeh->zeh_leaf, *zeh->zeh_chunkp);
+ ASSERT3U(le->le_type, ==, ZAP_CHUNK_ENTRY);
+
+ if (zap_getflags(zap) & ZAP_FLAG_UINT64_KEY) {
+ zap_leaf_array_read(zeh->zeh_leaf, le->le_name_chunk, 8,
+ le->le_name_numints, 8, buflen / 8, buf);
+ } else {
+ zap_leaf_array_read(zeh->zeh_leaf, le->le_name_chunk, 1,
+ le->le_name_numints, 1, buflen, buf);
+ }
+ if (le->le_name_numints > buflen)
+ return (EOVERFLOW);
+ return (0);
+}
+
+int
+zap_entry_update(zap_entry_handle_t *zeh,
+ uint8_t integer_size, uint64_t num_integers, const void *buf)
+{
+ int delta_chunks;
+ zap_leaf_t *l = zeh->zeh_leaf;
+ struct zap_leaf_entry *le = ZAP_LEAF_ENTRY(l, *zeh->zeh_chunkp);
+
+ delta_chunks = ZAP_LEAF_ARRAY_NCHUNKS(num_integers * integer_size) -
+ ZAP_LEAF_ARRAY_NCHUNKS(le->le_value_numints * le->le_value_intlen);
+
+ if ((int)l->l_phys->l_hdr.lh_nfree < delta_chunks)
+ return (EAGAIN);
+
+ zap_leaf_array_free(l, &le->le_value_chunk);
+ le->le_value_chunk =
+ zap_leaf_array_create(l, buf, integer_size, num_integers);
+ le->le_value_numints = num_integers;
+ le->le_value_intlen = integer_size;
+ return (0);
+}
+
+void
+zap_entry_remove(zap_entry_handle_t *zeh)
+{
+ uint16_t entry_chunk;
+ struct zap_leaf_entry *le;
+ zap_leaf_t *l = zeh->zeh_leaf;
+
+ ASSERT3P(zeh->zeh_chunkp, !=, &zeh->zeh_fakechunk);
+
+ entry_chunk = *zeh->zeh_chunkp;
+ le = ZAP_LEAF_ENTRY(l, entry_chunk);
+ ASSERT3U(le->le_type, ==, ZAP_CHUNK_ENTRY);
+
+ zap_leaf_array_free(l, &le->le_name_chunk);
+ zap_leaf_array_free(l, &le->le_value_chunk);
+
+ *zeh->zeh_chunkp = le->le_next;
+ zap_leaf_chunk_free(l, entry_chunk);
+
+ l->l_phys->l_hdr.lh_nentries--;
+}
+
+int
+zap_entry_create(zap_leaf_t *l, zap_name_t *zn, uint32_t cd,
+ uint8_t integer_size, uint64_t num_integers, const void *buf,
+ zap_entry_handle_t *zeh)
+{
+ uint16_t chunk;
+ uint16_t *chunkp;
+ struct zap_leaf_entry *le;
+ uint64_t valuelen;
+ int numchunks;
+ uint64_t h = zn->zn_hash;
+
+ valuelen = integer_size * num_integers;
+
+ numchunks = 1 + ZAP_LEAF_ARRAY_NCHUNKS(zn->zn_key_orig_numints *
+ zn->zn_key_intlen) + ZAP_LEAF_ARRAY_NCHUNKS(valuelen);
+ if (numchunks > ZAP_LEAF_NUMCHUNKS(l))
+ return (E2BIG);
+
+ if (cd == ZAP_NEED_CD) {
+ /* find the lowest unused cd */
+ if (l->l_phys->l_hdr.lh_flags & ZLF_ENTRIES_CDSORTED) {
+ cd = 0;
+
+ for (chunk = *LEAF_HASH_ENTPTR(l, h);
+ chunk != CHAIN_END; chunk = le->le_next) {
+ le = ZAP_LEAF_ENTRY(l, chunk);
+ if (le->le_cd > cd)
+ break;
+ if (le->le_hash == h) {
+ ASSERT3U(cd, ==, le->le_cd);
+ cd++;
+ }
+ }
+ } else {
+ /* old unsorted format; do it the O(n^2) way */
+ for (cd = 0; ; cd++) {
+ for (chunk = *LEAF_HASH_ENTPTR(l, h);
+ chunk != CHAIN_END; chunk = le->le_next) {
+ le = ZAP_LEAF_ENTRY(l, chunk);
+ if (le->le_hash == h &&
+ le->le_cd == cd) {
+ break;
+ }
+ }
+ /* If this cd is not in use, we are good. */
+ if (chunk == CHAIN_END)
+ break;
+ }
+ }
+ /*
+ * We would run out of space in a block before we could
+ * store enough entries to run out of CD values.
+ */
+ ASSERT3U(cd, <, zap_maxcd(zn->zn_zap));
+ }
+
+ if (l->l_phys->l_hdr.lh_nfree < numchunks)
+ return (EAGAIN);
+
+ /* make the entry */
+ chunk = zap_leaf_chunk_alloc(l);
+ le = ZAP_LEAF_ENTRY(l, chunk);
+ le->le_type = ZAP_CHUNK_ENTRY;
+ le->le_name_chunk = zap_leaf_array_create(l, zn->zn_key_orig,
+ zn->zn_key_intlen, zn->zn_key_orig_numints);
+ le->le_name_numints = zn->zn_key_orig_numints;
+ le->le_value_chunk =
+ zap_leaf_array_create(l, buf, integer_size, num_integers);
+ le->le_value_numints = num_integers;
+ le->le_value_intlen = integer_size;
+ le->le_hash = h;
+ le->le_cd = cd;
+
+ /* link it into the hash chain */
+ /* XXX if we did the search above, we could just use that */
+ chunkp = zap_leaf_rehash_entry(l, chunk);
+
+ l->l_phys->l_hdr.lh_nentries++;
+
+ zeh->zeh_leaf = l;
+ zeh->zeh_num_integers = num_integers;
+ zeh->zeh_integer_size = le->le_value_intlen;
+ zeh->zeh_cd = le->le_cd;
+ zeh->zeh_hash = le->le_hash;
+ zeh->zeh_chunkp = chunkp;
+
+ return (0);
+}
+
+/*
+ * Determine if there is another entry with the same normalized form.
+ * For performance purposes, either zn or name must be provided (the
+ * other can be NULL). Note, there usually won't be any hash
+ * conflicts, in which case we don't need the concatenated/normalized
+ * form of the name. But all callers have one of these on hand anyway,
+ * so might as well take advantage. A cleaner but slower interface
+ * would accept neither argument, and compute the normalized name as
+ * needed (using zap_name_alloc(zap_entry_read_name(zeh))).
+ */
+boolean_t
+zap_entry_normalization_conflict(zap_entry_handle_t *zeh, zap_name_t *zn,
+ const char *name, zap_t *zap)
+{
+ uint64_t chunk;
+ struct zap_leaf_entry *le;
+ boolean_t allocdzn = B_FALSE;
+
+ if (zap->zap_normflags == 0)
+ return (B_FALSE);
+
+ for (chunk = *LEAF_HASH_ENTPTR(zeh->zeh_leaf, zeh->zeh_hash);
+ chunk != CHAIN_END; chunk = le->le_next) {
+ le = ZAP_LEAF_ENTRY(zeh->zeh_leaf, chunk);
+ if (le->le_hash != zeh->zeh_hash)
+ continue;
+ if (le->le_cd == zeh->zeh_cd)
+ continue;
+
+ if (zn == NULL) {
+ zn = zap_name_alloc(zap, name, MT_FIRST);
+ allocdzn = B_TRUE;
+ }
+ if (zap_leaf_array_match(zeh->zeh_leaf, zn,
+ le->le_name_chunk, le->le_name_numints)) {
+ if (allocdzn)
+ zap_name_free(zn);
+ return (B_TRUE);
+ }
+ }
+ if (allocdzn)
+ zap_name_free(zn);
+ return (B_FALSE);
+}
+
+/*
+ * Routines for transferring entries between leafs.
+ */
+
+static uint16_t *
+zap_leaf_rehash_entry(zap_leaf_t *l, uint16_t entry)
+{
+ struct zap_leaf_entry *le = ZAP_LEAF_ENTRY(l, entry);
+ struct zap_leaf_entry *le2;
+ uint16_t *chunkp;
+
+ /*
+ * keep the entry chain sorted by cd
+ * NB: this will not cause problems for unsorted leafs, though
+ * it is unnecessary there.
+ */
+ for (chunkp = LEAF_HASH_ENTPTR(l, le->le_hash);
+ *chunkp != CHAIN_END; chunkp = &le2->le_next) {
+ le2 = ZAP_LEAF_ENTRY(l, *chunkp);
+ if (le2->le_cd > le->le_cd)
+ break;
+ }
+
+ le->le_next = *chunkp;
+ *chunkp = entry;
+ return (chunkp);
+}
+
+static uint16_t
+zap_leaf_transfer_array(zap_leaf_t *l, uint16_t chunk, zap_leaf_t *nl)
+{
+ uint16_t new_chunk;
+ uint16_t *nchunkp = &new_chunk;
+
+ while (chunk != CHAIN_END) {
+ uint16_t nchunk = zap_leaf_chunk_alloc(nl);
+ struct zap_leaf_array *nla =
+ &ZAP_LEAF_CHUNK(nl, nchunk).l_array;
+ struct zap_leaf_array *la =
+ &ZAP_LEAF_CHUNK(l, chunk).l_array;
+ int nextchunk = la->la_next;
+
+ ASSERT3U(chunk, <, ZAP_LEAF_NUMCHUNKS(l));
+ ASSERT3U(nchunk, <, ZAP_LEAF_NUMCHUNKS(l));
+
+ *nla = *la; /* structure assignment */
+
+ zap_leaf_chunk_free(l, chunk);
+ chunk = nextchunk;
+ *nchunkp = nchunk;
+ nchunkp = &nla->la_next;
+ }
+ *nchunkp = CHAIN_END;
+ return (new_chunk);
+}
+
+static void
+zap_leaf_transfer_entry(zap_leaf_t *l, int entry, zap_leaf_t *nl)
+{
+ struct zap_leaf_entry *le, *nle;
+ uint16_t chunk;
+
+ le = ZAP_LEAF_ENTRY(l, entry);
+ ASSERT3U(le->le_type, ==, ZAP_CHUNK_ENTRY);
+
+ chunk = zap_leaf_chunk_alloc(nl);
+ nle = ZAP_LEAF_ENTRY(nl, chunk);
+ *nle = *le; /* structure assignment */
+
+ (void) zap_leaf_rehash_entry(nl, chunk);
+
+ nle->le_name_chunk = zap_leaf_transfer_array(l, le->le_name_chunk, nl);
+ nle->le_value_chunk =
+ zap_leaf_transfer_array(l, le->le_value_chunk, nl);
+
+ zap_leaf_chunk_free(l, entry);
+
+ l->l_phys->l_hdr.lh_nentries--;
+ nl->l_phys->l_hdr.lh_nentries++;
+}
+
+/*
+ * Transfer the entries whose hash prefix ends in 1 to the new leaf.
+ */
+void
+zap_leaf_split(zap_leaf_t *l, zap_leaf_t *nl, boolean_t sort)
+{
+ int i;
+ int bit = 64 - 1 - l->l_phys->l_hdr.lh_prefix_len;
+
+ /* set new prefix and prefix_len */
+ l->l_phys->l_hdr.lh_prefix <<= 1;
+ l->l_phys->l_hdr.lh_prefix_len++;
+ nl->l_phys->l_hdr.lh_prefix = l->l_phys->l_hdr.lh_prefix | 1;
+ nl->l_phys->l_hdr.lh_prefix_len = l->l_phys->l_hdr.lh_prefix_len;
+
+ /* break existing hash chains */
+ zap_memset(l->l_phys->l_hash, CHAIN_END, 2*ZAP_LEAF_HASH_NUMENTRIES(l));
+
+ if (sort)
+ l->l_phys->l_hdr.lh_flags |= ZLF_ENTRIES_CDSORTED;
+
+ /*
+ * Transfer entries whose hash bit 'bit' is set to nl; rehash
+ * the remaining entries
+ *
+ * NB: We could find entries via the hashtable instead. That
+ * would be O(hashents+numents) rather than O(numblks+numents),
+ * but this accesses memory more sequentially, and when we're
+ * called, the block is usually pretty full.
+ */
+ for (i = 0; i < ZAP_LEAF_NUMCHUNKS(l); i++) {
+ struct zap_leaf_entry *le = ZAP_LEAF_ENTRY(l, i);
+ if (le->le_type != ZAP_CHUNK_ENTRY)
+ continue;
+
+ if (le->le_hash & (1ULL << bit))
+ zap_leaf_transfer_entry(l, i, nl);
+ else
+ (void) zap_leaf_rehash_entry(l, i);
+ }
+}
+
+void
+zap_leaf_stats(zap_t *zap, zap_leaf_t *l, zap_stats_t *zs)
+{
+ int i, n;
+
+ n = zap->zap_f.zap_phys->zap_ptrtbl.zt_shift -
+ l->l_phys->l_hdr.lh_prefix_len;
+ n = MIN(n, ZAP_HISTOGRAM_SIZE-1);
+ zs->zs_leafs_with_2n_pointers[n]++;
+
+
+ n = l->l_phys->l_hdr.lh_nentries/5;
+ n = MIN(n, ZAP_HISTOGRAM_SIZE-1);
+ zs->zs_blocks_with_n5_entries[n]++;
+
+ n = ((1<<FZAP_BLOCK_SHIFT(zap)) -
+ l->l_phys->l_hdr.lh_nfree * (ZAP_LEAF_ARRAY_BYTES+1))*10 /
+ (1<<FZAP_BLOCK_SHIFT(zap));
+ n = MIN(n, ZAP_HISTOGRAM_SIZE-1);
+ zs->zs_blocks_n_tenths_full[n]++;
+
+ for (i = 0; i < ZAP_LEAF_HASH_NUMENTRIES(l); i++) {
+ int nentries = 0;
+ int chunk = l->l_phys->l_hash[i];
+
+ while (chunk != CHAIN_END) {
+ struct zap_leaf_entry *le =
+ ZAP_LEAF_ENTRY(l, chunk);
+
+ n = 1 + ZAP_LEAF_ARRAY_NCHUNKS(le->le_name_numints) +
+ ZAP_LEAF_ARRAY_NCHUNKS(le->le_value_numints *
+ le->le_value_intlen);
+ n = MIN(n, ZAP_HISTOGRAM_SIZE-1);
+ zs->zs_entries_using_n_chunks[n]++;
+
+ chunk = le->le_next;
+ nentries++;
+ }
+
+ n = nentries;
+ n = MIN(n, ZAP_HISTOGRAM_SIZE-1);
+ zs->zs_buckets_with_n_entries[n]++;
+ }
+}
generated by cgit v1.2.3 (git 2.25.1) at 2025-11-04 02:56:17 +0000