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SUSE:SLE-15-SP2:GA
lvm2-clvm.15869
bug-1150021_02-radix-tree-Bring-radix-tree-up-t...
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File bug-1150021_02-radix-tree-Bring-radix-tree-up-to-date-with-the-mast.patch of Package lvm2-clvm.15869
From e55210302787d063d3037835316ca06d5cd63bd5 Mon Sep 17 00:00:00 2001 From: Joe Thornber <ejt@redhat.com> Date: Thu, 16 Jan 2020 14:03:42 +0000 Subject: [PATCH 1/9] [radix-tree] Bring radix-tree up to date with the master branch --- Makefile.in | 18 +- base/data-struct/radix-tree-adaptive.c | 1297 ++++++++++++++++++++++++++++++++ base/data-struct/radix-tree-simple.c | 256 +++++++ base/data-struct/radix-tree.c | 851 +-------------------- base/data-struct/radix-tree.h | 6 + make.tmpl.in | 12 +- test/unit/radix_tree_t.c | 399 +++++++++- 7 files changed, 1980 insertions(+), 859 deletions(-) create mode 100644 base/data-struct/radix-tree-adaptive.c create mode 100644 base/data-struct/radix-tree-simple.c diff --git a/Makefile.in b/Makefile.in index 29d5bed..3c8f8c8 100644 --- a/Makefile.in +++ b/Makefile.in @@ -51,18 +51,20 @@ DISTCLEAN_TARGETS += config.cache config.log config.status make.tmpl include make.tmpl -libdm: include -libdaemon: include -lib: libdm libdaemon -liblvm: lib -daemons: lib libdaemon tools -tools: lib libdaemon device-mapper +include $(top_srcdir)/base/Makefile + +libdm: include $(top_builddir)/base/libbase.a +libdaemon: include $(top_builddir)/base/libbase.a +lib: libdm libdaemon $(top_builddir)/base/libbase.a +liblvm: lib $(top_builddir)/base/libbase.a +daemons: lib libdaemon tools $(top_builddir)/base/libbase.a +tools: lib libdaemon device-mapper $(top_builddir)/base/libbase.a po: tools daemons man: tools all_man: tools scripts: liblvm libdm -test: tools daemons -unit-test: lib +test: tools daemons $(top_builddir)/base/libbase.a +unit-test: lib $(top_builddir)/base/libbase.a run-unit-test: unit-test lib.device-mapper: include.device-mapper diff --git a/base/data-struct/radix-tree-adaptive.c b/base/data-struct/radix-tree-adaptive.c new file mode 100644 index 0000000..b9ba417 --- /dev/null +++ b/base/data-struct/radix-tree-adaptive.c @@ -0,0 +1,1297 @@ +// Copyright (C) 2018 Red Hat, Inc. All rights reserved. +// +// This file is part of LVM2. +// +// This copyrighted material is made available to anyone wishing to use, +// modify, copy, or redistribute it subject to the terms and conditions +// of the GNU Lesser General Public License v.2.1. +// +// You should have received a copy of the GNU Lesser General Public License +// along with this program; if not, write to the Free Software Foundation, +// Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA + +#include "radix-tree.h" + +#include "base/memory/container_of.h" +#include "base/memory/zalloc.h" + +#include <assert.h> +#include <stdlib.h> +#include <stdio.h> +#include <string.h> + +//---------------------------------------------------------------- + +enum node_type { + UNSET = 0, + VALUE, + VALUE_CHAIN, + PREFIX_CHAIN, + NODE4, + NODE16, + NODE48, + NODE256 +}; + +struct value { + enum node_type type; + union radix_value value; +}; + +// This is used for entries that have a key which is a prefix of another key. +struct value_chain { + union radix_value value; + struct value child; +}; + +struct prefix_chain { + struct value child; + unsigned len; + uint8_t prefix[0]; +}; + +struct node4 { + uint32_t nr_entries; + uint8_t keys[4]; + struct value values[4]; +}; + +struct node16 { + uint32_t nr_entries; + uint8_t keys[16]; + struct value values[16]; +}; + +struct node48 { + uint32_t nr_entries; + uint8_t keys[256]; + struct value values[48]; +}; + +struct node256 { + uint32_t nr_entries; + struct value values[256]; +}; + +struct radix_tree { + unsigned nr_entries; + struct value root; + radix_value_dtr dtr; + void *dtr_context; +}; + +//---------------------------------------------------------------- + +struct radix_tree *radix_tree_create(radix_value_dtr dtr, void *dtr_context) +{ + struct radix_tree *rt = malloc(sizeof(*rt)); + + if (rt) { + rt->nr_entries = 0; + rt->root.type = UNSET; + rt->dtr = dtr; + rt->dtr_context = dtr_context; + } + + return rt; +} + +static inline void _dtr(struct radix_tree *rt, union radix_value v) +{ + if (rt->dtr) + rt->dtr(rt->dtr_context, v); +} + +// Returns the number of values removed +static unsigned _free_node(struct radix_tree *rt, struct value v) +{ + unsigned i, nr = 0; + struct value_chain *vc; + struct prefix_chain *pc; + struct node4 *n4; + struct node16 *n16; + struct node48 *n48; + struct node256 *n256; + + switch (v.type) { + case UNSET: + break; + + case VALUE: + _dtr(rt, v.value); + nr = 1; + break; + + case VALUE_CHAIN: + vc = v.value.ptr; + _dtr(rt, vc->value); + nr = 1 + _free_node(rt, vc->child); + free(vc); + break; + + case PREFIX_CHAIN: + pc = v.value.ptr; + nr = _free_node(rt, pc->child); + free(pc); + break; + + case NODE4: + n4 = (struct node4 *) v.value.ptr; + for (i = 0; i < n4->nr_entries; i++) + nr += _free_node(rt, n4->values[i]); + free(n4); + break; + + case NODE16: + n16 = (struct node16 *) v.value.ptr; + for (i = 0; i < n16->nr_entries; i++) + nr += _free_node(rt, n16->values[i]); + free(n16); + break; + + case NODE48: + n48 = (struct node48 *) v.value.ptr; + for (i = 0; i < n48->nr_entries; i++) + nr += _free_node(rt, n48->values[i]); + free(n48); + break; + + case NODE256: + n256 = (struct node256 *) v.value.ptr; + for (i = 0; i < 256; i++) + nr += _free_node(rt, n256->values[i]); + free(n256); + break; + } + + return nr; +} + +void radix_tree_destroy(struct radix_tree *rt) +{ + _free_node(rt, rt->root); + free(rt); +} + +unsigned radix_tree_size(struct radix_tree *rt) +{ + return rt->nr_entries; +} + +static bool _insert(struct radix_tree *rt, struct value *v, uint8_t *kb, uint8_t *ke, union radix_value rv); + +static bool _insert_unset(struct radix_tree *rt, struct value *v, uint8_t *kb, uint8_t *ke, union radix_value rv) +{ + unsigned len = ke - kb; + + if (!len) { + // value + v->type = VALUE; + v->value = rv; + rt->nr_entries++; + } else { + // prefix -> value + struct prefix_chain *pc = zalloc(sizeof(*pc) + len); + if (!pc) + return false; + + pc->child.type = VALUE; + pc->child.value = rv; + pc->len = len; + memcpy(pc->prefix, kb, len); + v->type = PREFIX_CHAIN; + v->value.ptr = pc; + rt->nr_entries++; + } + + return true; +} + +static bool _insert_value(struct radix_tree *rt, struct value *v, uint8_t *kb, uint8_t *ke, union radix_value rv) +{ + unsigned len = ke - kb; + + if (!len) + // overwrite + v->value = rv; + + else { + // value_chain -> value + struct value_chain *vc = zalloc(sizeof(*vc)); + if (!vc) + return false; + + vc->value = v->value; + if (!_insert(rt, &vc->child, kb, ke, rv)) { + free(vc); + return false; + } + + v->type = VALUE_CHAIN; + v->value.ptr = vc; + } + + return true; +} + +static bool _insert_value_chain(struct radix_tree *rt, struct value *v, uint8_t *kb, uint8_t *ke, union radix_value rv) +{ + struct value_chain *vc = v->value.ptr; + return _insert(rt, &vc->child, kb, ke, rv); +} + +static unsigned min(unsigned lhs, unsigned rhs) +{ + if (lhs <= rhs) + return lhs; + else + return rhs; +} + +static bool _insert_prefix_chain(struct radix_tree *rt, struct value *v, uint8_t *kb, uint8_t *ke, union radix_value rv) +{ + struct prefix_chain *pc = v->value.ptr; + + if (!pc->len) { + v->type = VALUE; + v->value = rv; + + } else if (*kb == pc->prefix[0]) { + // There's a common prefix let's split the chain into two and + // recurse. + struct prefix_chain *pc2; + unsigned i, len = min(pc->len, ke - kb); + + for (i = 0; i < len; i++) + if (kb[i] != pc->prefix[i]) + break; + + if (!(pc2 = zalloc(sizeof(*pc2) + pc->len - i))) + return false; + pc2->len = pc->len - i; + memmove(pc2->prefix, pc->prefix + i, pc2->len); + pc2->child = pc->child; + + // FIXME: this trashes pc so we can't back out + pc->child.type = PREFIX_CHAIN; + pc->child.value.ptr = pc2; + pc->len = i; + + if (!_insert(rt, &pc->child, kb + i, ke, rv)) { + free(pc2); + return false; + } + + } else { + // Stick an n4 in front. + struct node4 *n4 = zalloc(sizeof(*n4)); + if (!n4) + return false; + + n4->keys[0] = pc->prefix[0]; + if (pc->len == 1) { + n4->values[0] = pc->child; + free(pc); + } else { + memmove(pc->prefix, pc->prefix + 1, pc->len - 1); + pc->len--; + n4->values[0] = *v; + } + + n4->keys[1] = *kb; + if (!_insert(rt, n4->values + 1, kb + 1, ke, rv)) { + free(n4); + return false; + } + + n4->nr_entries = 2; + + v->type = NODE4; + v->value.ptr = n4; + } + + return true; +} + +static bool _insert_node4(struct radix_tree *rt, struct value *v, uint8_t *kb, uint8_t *ke, union radix_value rv) +{ + struct node4 *n4 = v->value.ptr; + if (n4->nr_entries == 4) { + struct node16 *n16 = zalloc(sizeof(*n16)); + if (!n16) + return false; + + n16->nr_entries = 5; + memcpy(n16->keys, n4->keys, sizeof(n4->keys)); + memcpy(n16->values, n4->values, sizeof(n4->values)); + + n16->keys[4] = *kb; + if (!_insert(rt, n16->values + 4, kb + 1, ke, rv)) { + free(n16); + return false; + } + free(n4); + v->type = NODE16; + v->value.ptr = n16; + } else { + if (!_insert(rt, n4->values + n4->nr_entries, kb + 1, ke, rv)) + return false; + + n4->keys[n4->nr_entries] = *kb; + n4->nr_entries++; + } + return true; +} + +static bool _insert_node16(struct radix_tree *rt, struct value *v, uint8_t *kb, uint8_t *ke, union radix_value rv) +{ + struct node16 *n16 = v->value.ptr; + + if (n16->nr_entries == 16) { + unsigned i; + struct node48 *n48 = zalloc(sizeof(*n48)); + + if (!n48) + return false; + + n48->nr_entries = 17; + /* coverity[bad_memset] intentional use of '0' */ + memset(n48->keys, 48, sizeof(n48->keys)); + + for (i = 0; i < 16; i++) { + n48->keys[n16->keys[i]] = i; + n48->values[i] = n16->values[i]; + } + + n48->keys[*kb] = 16; + if (!_insert(rt, n48->values + 16, kb + 1, ke, rv)) { + free(n48); + return false; + } + + free(n16); + v->type = NODE48; + v->value.ptr = n48; + } else { + if (!_insert(rt, n16->values + n16->nr_entries, kb + 1, ke, rv)) + return false; + n16->keys[n16->nr_entries] = *kb; + n16->nr_entries++; + } + + return true; +} + +static bool _insert_node48(struct radix_tree *rt, struct value *v, uint8_t *kb, uint8_t *ke, union radix_value rv) +{ + struct node48 *n48 = v->value.ptr; + if (n48->nr_entries == 48) { + unsigned i; + struct node256 *n256 = zalloc(sizeof(*n256)); + if (!n256) + return false; + + n256->nr_entries = 49; + for (i = 0; i < 256; i++) { + if (n48->keys[i] < 48) + n256->values[i] = n48->values[n48->keys[i]]; + } + + if (!_insert(rt, n256->values + *kb, kb + 1, ke, rv)) { + free(n256); + return false; + } + + free(n48); + v->type = NODE256; + v->value.ptr = n256; + + } else { + if (!_insert(rt, n48->values + n48->nr_entries, kb + 1, ke, rv)) + return false; + + n48->keys[*kb] = n48->nr_entries; + n48->nr_entries++; + } + + return true; +} + +static bool _insert_node256(struct radix_tree *rt, struct value *v, uint8_t *kb, uint8_t *ke, union radix_value rv) +{ + struct node256 *n256 = v->value.ptr; + bool r, was_unset = n256->values[*kb].type == UNSET; + + r = _insert(rt, n256->values + *kb, kb + 1, ke, rv); + if (r && was_unset) + n256->nr_entries++; + + return r; +} + +// FIXME: the tree should not be touched if insert fails (eg, OOM) +static bool _insert(struct radix_tree *rt, struct value *v, uint8_t *kb, uint8_t *ke, union radix_value rv) +{ + if (kb == ke) { + if (v->type == UNSET) { + v->type = VALUE; + v->value = rv; + rt->nr_entries++; + + } else if (v->type == VALUE) { + v->value = rv; + + } else { + struct value_chain *vc = zalloc(sizeof(*vc)); + if (!vc) + return false; + + vc->value = rv; + vc->child = *v; + v->type = VALUE_CHAIN; + v->value.ptr = vc; + rt->nr_entries++; + } + return true; + } + + switch (v->type) { + case UNSET: + return _insert_unset(rt, v, kb, ke, rv); + + case VALUE: + return _insert_value(rt, v, kb, ke, rv); + + case VALUE_CHAIN: + return _insert_value_chain(rt, v, kb, ke, rv); + + case PREFIX_CHAIN: + return _insert_prefix_chain(rt, v, kb, ke, rv); + + case NODE4: + return _insert_node4(rt, v, kb, ke, rv); + + case NODE16: + return _insert_node16(rt, v, kb, ke, rv); + + case NODE48: + return _insert_node48(rt, v, kb, ke, rv); + + case NODE256: + return _insert_node256(rt, v, kb, ke, rv); + } + + // can't get here + return false; +} + +struct lookup_result { + struct value *v; + uint8_t *kb; +}; + +static struct lookup_result _lookup_prefix(struct value *v, uint8_t *kb, uint8_t *ke) +{ + unsigned i; + struct value_chain *vc; + struct prefix_chain *pc; + struct node4 *n4; + struct node16 *n16; + struct node48 *n48; + struct node256 *n256; + + if (kb == ke) + return (struct lookup_result) {.v = v, .kb = kb}; + + switch (v->type) { + case UNSET: + case VALUE: + break; + + case VALUE_CHAIN: + vc = v->value.ptr; + return _lookup_prefix(&vc->child, kb, ke); + + case PREFIX_CHAIN: + pc = v->value.ptr; + if (ke - kb < pc->len) + return (struct lookup_result) {.v = v, .kb = kb}; + + for (i = 0; i < pc->len; i++) + if (kb[i] != pc->prefix[i]) + return (struct lookup_result) {.v = v, .kb = kb}; + + return _lookup_prefix(&pc->child, kb + pc->len, ke); + + case NODE4: + n4 = v->value.ptr; + for (i = 0; i < n4->nr_entries; i++) + if (n4->keys[i] == *kb) + return _lookup_prefix(n4->values + i, kb + 1, ke); + break; + + case NODE16: + // FIXME: use binary search or simd? + n16 = v->value.ptr; + for (i = 0; i < n16->nr_entries; i++) + if (n16->keys[i] == *kb) + return _lookup_prefix(n16->values + i, kb + 1, ke); + break; + + case NODE48: + n48 = v->value.ptr; + i = n48->keys[*kb]; + if (i < 48) + return _lookup_prefix(n48->values + i, kb + 1, ke); + break; + + case NODE256: + n256 = v->value.ptr; + if (n256->values[*kb].type != UNSET) + return _lookup_prefix(n256->values + *kb, kb + 1, ke); + break; + } + + return (struct lookup_result) {.v = v, .kb = kb}; +} + +bool radix_tree_insert(struct radix_tree *rt, uint8_t *kb, uint8_t *ke, union radix_value rv) +{ + struct lookup_result lr = _lookup_prefix(&rt->root, kb, ke); + return _insert(rt, lr.v, lr.kb, ke, rv); +} + +// Note the degrade functions also free the original node. +static void _degrade_to_n4(struct node16 *n16, struct value *result) +{ + struct node4 *n4 = zalloc(sizeof(*n4)); + + assert(n4 != NULL); + + n4->nr_entries = n16->nr_entries; + memcpy(n4->keys, n16->keys, n16->nr_entries * sizeof(*n4->keys)); + memcpy(n4->values, n16->values, n16->nr_entries * sizeof(*n4->values)); + free(n16); + + result->type = NODE4; + result->value.ptr = n4; +} + +static void _degrade_to_n16(struct node48 *n48, struct value *result) +{ + unsigned i, count = 0; + struct node16 *n16 = zalloc(sizeof(*n16)); + + assert(n16 != NULL); + + n16->nr_entries = n48->nr_entries; + for (i = 0; i < 256; i++) { + if (n48->keys[i] < 48) { + n16->keys[count] = i; + n16->values[count] = n48->values[n48->keys[i]]; + count++; + } + } + + free(n48); + + result->type = NODE16; + result->value.ptr = n16; +} + +static void _degrade_to_n48(struct node256 *n256, struct value *result) +{ + unsigned i, count = 0; + struct node48 *n48 = zalloc(sizeof(*n48)); + + assert(n48 != NULL); + + n48->nr_entries = n256->nr_entries; + for (i = 0; i < 256; i++) { + if (n256->values[i].type == UNSET) + n48->keys[i] = 48; + + else { + n48->keys[i] = count; + n48->values[count] = n256->values[i]; + count++; + } + } + + free(n256); + + result->type = NODE48; + result->value.ptr = n48; +} + +// Removes an entry in an array by sliding the values above it down. +static void _erase_elt(void *array, size_t obj_size, unsigned count, unsigned idx) +{ + if (idx == (count - 1)) + // The simple case + return; + + memmove(((uint8_t *) array) + (obj_size * idx), + ((uint8_t *) array) + (obj_size * (idx + 1)), + obj_size * (count - idx - 1)); + + // Zero the now unused last elt (set's v.type to UNSET) + memset(((uint8_t *) array) + (count - 1) * obj_size, 0, obj_size); +} + +static bool _remove(struct radix_tree *rt, struct value *root, uint8_t *kb, uint8_t *ke) +{ + bool r; + unsigned i, j; + struct value_chain *vc; + struct prefix_chain *pc; + struct node4 *n4; + struct node16 *n16; + struct node48 *n48; + struct node256 *n256; + + if (kb == ke) { + if (root->type == VALUE) { + root->type = UNSET; + _dtr(rt, root->value); + return true; + + } else if (root->type == VALUE_CHAIN) { + vc = root->value.ptr; + _dtr(rt, vc->value); + memcpy(root, &vc->child, sizeof(*root)); + free(vc); + return true; + + } else + return false; + } + + switch (root->type) { + case UNSET: + case VALUE: + // this is a value for a prefix of the key + return false; + + case VALUE_CHAIN: + vc = root->value.ptr; + r = _remove(rt, &vc->child, kb, ke); + if (r && (vc->child.type == UNSET)) { + root->type = VALUE; + root->value = vc->value; + free(vc); + } + return r; + + case PREFIX_CHAIN: + pc = root->value.ptr; + if (ke - kb < pc->len) + return false; + + for (i = 0; i < pc->len; i++) + if (kb[i] != pc->prefix[i]) + return false; + + r = _remove(rt, &pc->child, kb + pc->len, ke); + if (r && pc->child.type == UNSET) { + root->type = UNSET; + free(pc); + } + return r; + + case NODE4: + n4 = root->value.ptr; + for (i = 0; i < n4->nr_entries; i++) { + if (n4->keys[i] == *kb) { + r = _remove(rt, n4->values + i, kb + 1, ke); + if (r && n4->values[i].type == UNSET) { + if (i < n4->nr_entries) { + _erase_elt(n4->keys, sizeof(*n4->keys), n4->nr_entries, i); + _erase_elt(n4->values, sizeof(*n4->values), n4->nr_entries, i); + } + + n4->nr_entries--; + if (!n4->nr_entries) { + free(n4); + root->type = UNSET; + } + } + return r; + } + } + return false; + + case NODE16: + n16 = root->value.ptr; + for (i = 0; i < n16->nr_entries; i++) { + if (n16->keys[i] == *kb) { + r = _remove(rt, n16->values + i, kb + 1, ke); + if (r && n16->values[i].type == UNSET) { + if (i < n16->nr_entries) { + _erase_elt(n16->keys, sizeof(*n16->keys), n16->nr_entries, i); + _erase_elt(n16->values, sizeof(*n16->values), n16->nr_entries, i); + } + + n16->nr_entries--; + if (n16->nr_entries <= 4) { + _degrade_to_n4(n16, root); + } + } + return r; + } + } + return false; + + case NODE48: + n48 = root->value.ptr; + i = n48->keys[*kb]; + if (i < 48) { + r = _remove(rt, n48->values + i, kb + 1, ke); + if (r && n48->values[i].type == UNSET) { + n48->keys[*kb] = 48; + for (j = 0; j < 256; j++) + if (n48->keys[j] < 48 && n48->keys[j] > i) + n48->keys[j]--; + _erase_elt(n48->values, sizeof(*n48->values), n48->nr_entries, i); + n48->nr_entries--; + if (n48->nr_entries <= 16) + _degrade_to_n16(n48, root); + } + return r; + } + return false; + + case NODE256: + n256 = root->value.ptr; + r = _remove(rt, n256->values + (*kb), kb + 1, ke); + if (r && n256->values[*kb].type == UNSET) { + n256->nr_entries--; + if (n256->nr_entries <= 48) + _degrade_to_n48(n256, root); + } + return r; + } + + return false; +} + +bool radix_tree_remove(struct radix_tree *rt, uint8_t *key_begin, uint8_t *key_end) +{ + if (_remove(rt, &rt->root, key_begin, key_end)) { + rt->nr_entries--; + return true; + } + + return false; +} + +//---------------------------------------------------------------- + +static bool _prefix_chain_matches(struct lookup_result *lr, uint8_t *ke) +{ + // It's possible the top node is a prefix chain, and + // the remaining key matches part of it. + if (lr->v->type == PREFIX_CHAIN) { + unsigned i, rlen = ke - lr->kb; + struct prefix_chain *pc = lr->v->value.ptr; + if (rlen < pc->len) { + for (i = 0; i < rlen; i++) + if (pc->prefix[i] != lr->kb[i]) + return false; + return true; + } + } + + return false; +} + +static bool _remove_subtree(struct radix_tree *rt, struct value *root, uint8_t *kb, uint8_t *ke, unsigned *count) +{ + bool r; + unsigned i, j, len; + struct value_chain *vc; + struct prefix_chain *pc; + struct node4 *n4; + struct node16 *n16; + struct node48 *n48; + struct node256 *n256; + + if (kb == ke) { + *count += _free_node(rt, *root); + root->type = UNSET; + return true; + } + + switch (root->type) { + case UNSET: + case VALUE: + // No entries with the given prefix + return true; + + case VALUE_CHAIN: + vc = root->value.ptr; + r = _remove_subtree(rt, &vc->child, kb, ke, count); + if (r && (vc->child.type == UNSET)) { + root->type = VALUE; + root->value = vc->value; + free(vc); + } + return r; + + case PREFIX_CHAIN: + pc = root->value.ptr; + len = min(pc->len, ke - kb); + for (i = 0; i < len; i++) + if (kb[i] != pc->prefix[i]) + return true; + + r = _remove_subtree(rt, &pc->child, len < pc->len ? ke : (kb + pc->len), ke, count); + if (r && pc->child.type == UNSET) { + root->type = UNSET; + free(pc); + } + return r; + + case NODE4: + n4 = root->value.ptr; + for (i = 0; i < n4->nr_entries; i++) { + if (n4->keys[i] == *kb) { + r = _remove_subtree(rt, n4->values + i, kb + 1, ke, count); + if (r && n4->values[i].type == UNSET) { + if (i < n4->nr_entries) { + _erase_elt(n4->keys, sizeof(*n4->keys), n4->nr_entries, i); + _erase_elt(n4->values, sizeof(*n4->values), n4->nr_entries, i); + } + + n4->nr_entries--; + if (!n4->nr_entries) { + free(n4); + root->type = UNSET; + } + } + return r; + } + } + return true; + + case NODE16: + n16 = root->value.ptr; + for (i = 0; i < n16->nr_entries; i++) { + if (n16->keys[i] == *kb) { + r = _remove_subtree(rt, n16->values + i, kb + 1, ke, count); + if (r && n16->values[i].type == UNSET) { + if (i < n16->nr_entries) { + _erase_elt(n16->keys, sizeof(*n16->keys), n16->nr_entries, i); + _erase_elt(n16->values, sizeof(*n16->values), n16->nr_entries, i); + } + + n16->nr_entries--; + if (n16->nr_entries <= 4) + _degrade_to_n4(n16, root); + } + return r; + } + } + return true; + + case NODE48: + n48 = root->value.ptr; + i = n48->keys[*kb]; + if (i < 48) { + r = _remove_subtree(rt, n48->values + i, kb + 1, ke, count); + if (r && n48->values[i].type == UNSET) { + n48->keys[*kb] = 48; + for (j = 0; j < 256; j++) + if (n48->keys[j] < 48 && n48->keys[j] > i) + n48->keys[j]--; + _erase_elt(n48->values, sizeof(*n48->values), n48->nr_entries, i); + n48->nr_entries--; + if (n48->nr_entries <= 16) + _degrade_to_n16(n48, root); + } + return r; + } + return true; + + case NODE256: + n256 = root->value.ptr; + if (n256->values[*kb].type == UNSET) + return true; // No entries + + r = _remove_subtree(rt, n256->values + (*kb), kb + 1, ke, count); + if (r && n256->values[*kb].type == UNSET) { + n256->nr_entries--; + if (n256->nr_entries <= 48) + _degrade_to_n48(n256, root); + } + return r; + } + + // Shouldn't get here + return false; +} + +unsigned radix_tree_remove_prefix(struct radix_tree *rt, uint8_t *kb, uint8_t *ke) +{ + unsigned count = 0; + + if (_remove_subtree(rt, &rt->root, kb, ke, &count)) + rt->nr_entries -= count; + + return count; +} + +//---------------------------------------------------------------- + +bool radix_tree_lookup(struct radix_tree *rt, + uint8_t *kb, uint8_t *ke, union radix_value *result) +{ + struct value_chain *vc; + struct lookup_result lr = _lookup_prefix(&rt->root, kb, ke); + if (lr.kb == ke) { + switch (lr.v->type) { + case VALUE: + *result = lr.v->value; + return true; + + case VALUE_CHAIN: + vc = lr.v->value.ptr; + *result = vc->value; + return true; + + default: + return false; + } + } + + return false; +} + +// FIXME: build up the keys too +static bool _iterate(struct value *v, struct radix_tree_iterator *it) +{ + unsigned i; + struct value_chain *vc; + struct prefix_chain *pc; + struct node4 *n4; + struct node16 *n16; + struct node48 *n48; + struct node256 *n256; + + switch (v->type) { + case UNSET: + // can't happen + break; + + case VALUE: + return it->visit(it, NULL, NULL, v->value); + + case VALUE_CHAIN: + vc = v->value.ptr; + return it->visit(it, NULL, NULL, vc->value) && _iterate(&vc->child, it); + + case PREFIX_CHAIN: + pc = v->value.ptr; + return _iterate(&pc->child, it); + + case NODE4: + n4 = (struct node4 *) v->value.ptr; + for (i = 0; i < n4->nr_entries; i++) + if (!_iterate(n4->values + i, it)) + return false; + return true; + + case NODE16: + n16 = (struct node16 *) v->value.ptr; + for (i = 0; i < n16->nr_entries; i++) + if (!_iterate(n16->values + i, it)) + return false; + return true; + + case NODE48: + n48 = (struct node48 *) v->value.ptr; + for (i = 0; i < n48->nr_entries; i++) + if (!_iterate(n48->values + i, it)) + return false; + return true; + + case NODE256: + n256 = (struct node256 *) v->value.ptr; + for (i = 0; i < 256; i++) + if (n256->values[i].type != UNSET && !_iterate(n256->values + i, it)) + return false; + return true; + } + + // can't get here + return false; +} + +void radix_tree_iterate(struct radix_tree *rt, uint8_t *kb, uint8_t *ke, + struct radix_tree_iterator *it) +{ + struct lookup_result lr = _lookup_prefix(&rt->root, kb, ke); + if (lr.kb == ke || _prefix_chain_matches(&lr, ke)) + _iterate(lr.v, it); +} + +//---------------------------------------------------------------- +// Checks: +// 1) The number of entries matches rt->nr_entries +// 2) The number of entries is correct in each node +// 3) prefix chain len > 0 +// 4) all unused values are UNSET + +static bool _check_nodes(struct value *v, unsigned *count) +{ + uint64_t bits; + unsigned i, ncount; + struct value_chain *vc; + struct prefix_chain *pc; + struct node4 *n4; + struct node16 *n16; + struct node48 *n48; + struct node256 *n256; + + switch (v->type) { + case UNSET: + return true; + + case VALUE: + (*count)++; + return true; + + case VALUE_CHAIN: + (*count)++; + vc = v->value.ptr; + return _check_nodes(&vc->child, count); + + case PREFIX_CHAIN: + pc = v->value.ptr; + return _check_nodes(&pc->child, count); + + case NODE4: + n4 = v->value.ptr; + for (i = 0; i < n4->nr_entries; i++) + if (!_check_nodes(n4->values + i, count)) + return false; + + for (i = n4->nr_entries; i < 4; i++) + if (n4->values[i].type != UNSET) { + fprintf(stderr, "unused value is not UNSET (n4)\n"); + return false; + } + + return true; + + case NODE16: + n16 = v->value.ptr; + for (i = 0; i < n16->nr_entries; i++) + if (!_check_nodes(n16->values + i, count)) + return false; + + for (i = n16->nr_entries; i < 16; i++) + if (n16->values[i].type != UNSET) { + fprintf(stderr, "unused value is not UNSET (n16)\n"); + return false; + } + + return true; + + case NODE48: + bits = 0; + n48 = v->value.ptr; + ncount = 0; + for (i = 0; i < 256; i++) { + if (n48->keys[i] < 48) { + if (n48->keys[i] >= n48->nr_entries) { + fprintf(stderr, "referencing value past nr_entries (n48)\n"); + return false; + } + + if (bits & (1ull << n48->keys[i])) { + fprintf(stderr, "duplicate entry (n48) %u\n", (unsigned) n48->keys[i]); + return false; + } + bits = bits | (1ull << n48->keys[i]); + ncount++; + + if (!_check_nodes(n48->values + n48->keys[i], count)) + return false; + } + } + + for (i = 0; i < n48->nr_entries; i++) { + if (!(bits & (1ull << i))) { + fprintf(stderr, "not all values are referenced (n48)\n"); + return false; + } + } + + if (ncount != n48->nr_entries) { + fprintf(stderr, "incorrect number of entries in n48, n48->nr_entries = %u, actual = %u\n", + n48->nr_entries, ncount); + return false; + } + + for (i = 0; i < n48->nr_entries; i++) + if (n48->values[i].type == UNSET) { + fprintf(stderr, "value in UNSET (n48)\n"); + return false; + } + + for (i = n48->nr_entries; i < 48; i++) + if (n48->values[i].type != UNSET) { + fprintf(stderr, "unused value is not UNSET (n48)\n"); + return false; + } + + return true; + + case NODE256: + n256 = v->value.ptr; + + ncount = 0; + for (i = 0; i < 256; i++) { + struct value *v2 = n256->values + i; + + if (v2->type == UNSET) + continue; + + if (!_check_nodes(v2, count)) + return false; + + ncount++; + } + + if (ncount != n256->nr_entries) { + fprintf(stderr, "incorrect number of entries in n256, n256->nr_entries = %u, actual = %u\n", + n256->nr_entries, ncount); + return false; + } + + return true; + + default: + fprintf(stderr, "unknown value type: %u\n", v->type); + } + + fprintf(stderr, "shouldn't get here\n"); + return false; +} + +bool radix_tree_is_well_formed(struct radix_tree *rt) +{ + unsigned count = 0; + + if (!_check_nodes(&rt->root, &count)) + return false; + + if (rt->nr_entries != count) { + fprintf(stderr, "incorrect entry count: rt->nr_entries = %u, actual = %u\n", + rt->nr_entries, count); + return false; + } + + return true; +} + +//---------------------------------------------------------------- + +static void _dump(FILE *out, struct value v, unsigned indent) +{ + unsigned i; + struct value_chain *vc; + struct prefix_chain *pc; + struct node4 *n4; + struct node16 *n16; + struct node48 *n48; + struct node256 *n256; + + if (v.type == UNSET) + return; + + for (i = 0; i < 2 * indent; i++) + fprintf(out, " "); + + switch (v.type) { + case UNSET: + // can't happen + break; + + case VALUE: + fprintf(out, "<val: %llu>\n", (unsigned long long) v.value.n); + break; + + case VALUE_CHAIN: + vc = v.value.ptr; + fprintf(out, "<val_chain: %llu>\n", (unsigned long long) vc->value.n); + _dump(out, vc->child, indent + 1); + break; + + case PREFIX_CHAIN: + pc = v.value.ptr; + fprintf(out, "<prefix: "); + for (i = 0; i < pc->len; i++) + fprintf(out, "%x.", (unsigned) *(pc->prefix + i)); + fprintf(out, ">\n"); + _dump(out, pc->child, indent + 1); + break; + + case NODE4: + n4 = v.value.ptr; + fprintf(out, "<n4: "); + for (i = 0; i < n4->nr_entries; i++) + fprintf(out, "%x ", (unsigned) n4->keys[i]); + fprintf(out, ">\n"); + + for (i = 0; i < n4->nr_entries; i++) + _dump(out, n4->values[i], indent + 1); + break; + + case NODE16: + n16 = v.value.ptr; + fprintf(out, "<n16: "); + for (i = 0; i < n16->nr_entries; i++) + fprintf(out, "%x ", (unsigned) n16->keys[i]); + fprintf(out, ">\n"); + + for (i = 0; i < n16->nr_entries; i++) + _dump(out, n16->values[i], indent + 1); + break; + + case NODE48: + n48 = v.value.ptr; + fprintf(out, "<n48: "); + for (i = 0; i < 256; i++) + if (n48->keys[i] < 48) + fprintf(out, "%x ", i); + fprintf(out, ">\n"); + + for (i = 0; i < n48->nr_entries; i++) { + assert(n48->values[i].type != UNSET); + _dump(out, n48->values[i], indent + 1); + } + break; + + case NODE256: + n256 = v.value.ptr; + fprintf(out, "<n256: "); + for (i = 0; i < 256; i++) + if (n256->values[i].type != UNSET) + fprintf(out, "%x ", i); + fprintf(out, ">\n"); + + for (i = 0; i < 256; i++) + if (n256->values[i].type != UNSET) + _dump(out, n256->values[i], indent + 1); + break; + } +} + +void radix_tree_dump(struct radix_tree *rt, FILE *out) +{ + _dump(out, rt->root, 0); +} + +//---------------------------------------------------------------- diff --git a/base/data-struct/radix-tree-simple.c b/base/data-struct/radix-tree-simple.c new file mode 100644 index 0000000..e8a2fdd --- /dev/null +++ b/base/data-struct/radix-tree-simple.c @@ -0,0 +1,256 @@ +// Copyright (C) 2018 Red Hat, Inc. All rights reserved. +// +// This file is part of LVM2. +// +// This copyrighted material is made available to anyone wishing to use, +// modify, copy, or redistribute it subject to the terms and conditions +// of the GNU Lesser General Public License v.2.1. +// +// You should have received a copy of the GNU Lesser General Public License +// along with this program; if not, write to the Free Software Foundation, +// Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA + +#include "radix-tree.h" + +#include "base/memory/container_of.h" +#include "base/memory/zalloc.h" + +#include <assert.h> +#include <stdlib.h> +#include <stdio.h> + +//---------------------------------------------------------------- +// This implementation is based around nested binary trees. Very +// simple (and hopefully correct). + +struct node { + struct node *left; + struct node *right; + + uint8_t key; + struct node *center; + + bool has_value; + union radix_value value; +}; + +struct radix_tree { + radix_value_dtr dtr; + void *dtr_context; + + struct node *root; +}; + +struct radix_tree * +radix_tree_create(radix_value_dtr dtr, void *dtr_context) +{ + struct radix_tree *rt = zalloc(sizeof(*rt)); + + if (rt) { + rt->dtr = dtr; + rt->dtr_context = dtr_context; + } + + return rt; +} + +// Returns the number of entries in the tree +static unsigned _destroy_tree(struct node *n, radix_value_dtr dtr, void *context) +{ + unsigned r; + + if (!n) + return 0; + + r = _destroy_tree(n->left, dtr, context); + r += _destroy_tree(n->right, dtr, context); + r += _destroy_tree(n->center, dtr, context); + + if (n->has_value) { + if (dtr) + dtr(context, n->value); + r++; + } + + free(n); + + return r; +} + +void radix_tree_destroy(struct radix_tree *rt) +{ + _destroy_tree(rt->root, rt->dtr, rt->dtr_context); + free(rt); +} + +static unsigned _count(struct node *n) +{ + unsigned r; + + if (!n) + return 0; + + r = _count(n->left); + r += _count(n->right); + r += _count(n->center); + + if (n->has_value) + r++; + + return r; +} + +unsigned radix_tree_size(struct radix_tree *rt) +{ + return _count(rt->root); +} + +static struct node **_lookup(struct node **pn, uint8_t *kb, uint8_t *ke) +{ + struct node *n = *pn; + + if (!n || (kb == ke)) + return pn; + + if (*kb < n->key) + return _lookup(&n->left, kb, ke); + + else if (*kb > n->key) + return _lookup(&n->right, kb, ke); + + else + return _lookup(&n->center, kb + 1, ke); +} + +static bool _insert(struct node **pn, uint8_t *kb, uint8_t *ke, union radix_value v) +{ + struct node *n = *pn; + + if (!n) { + n = zalloc(sizeof(*n)); + if (!n) + return false; + + n->key = *kb; + *pn = n; + } + + if (kb == ke) { + n->has_value = true; + n->value = v; + return true; + } + + if (*kb < n->key) + return _insert(&n->left, kb, ke, v); + + else if (*kb > n->key) + return _insert(&n->right, kb, ke, v); + + else + return _insert(&n->center, kb + 1, ke, v); +} + +bool radix_tree_insert(struct radix_tree *rt, uint8_t *kb, uint8_t *ke, union radix_value v) +{ + return _insert(&rt->root, kb, ke, v); +} + +bool radix_tree_remove(struct radix_tree *rt, uint8_t *kb, uint8_t *ke) +{ + struct node **pn = _lookup(&rt->root, kb, ke); + struct node *n = *pn; + + if (!n || !n->has_value) + return false; + + else { + if (rt->dtr) + rt->dtr(rt->dtr_context, n->value); + + if (n->left || n->center || n->right) { + n->has_value = false; + return true; + + } else { + // FIXME: delete parent if this was the last entry + free(n); + *pn = NULL; + } + + return true; + } +} + +unsigned radix_tree_remove_prefix(struct radix_tree *rt, uint8_t *kb, uint8_t *ke) +{ + struct node **pn; + unsigned count; + + pn = _lookup(&rt->root, kb, ke); + + if (*pn) { + count = _destroy_tree(*pn, rt->dtr, rt->dtr_context); + *pn = NULL; + } + + return count; +} + +bool +radix_tree_lookup(struct radix_tree *rt, uint8_t *kb, uint8_t *ke, union radix_value *result) +{ + struct node **pn = _lookup(&rt->root, kb, ke); + struct node *n = *pn; + + if (n && n->has_value) { + *result = n->value; + return true; + } else + return false; +} + +static void _iterate(struct node *n, struct radix_tree_iterator *it) +{ + if (!n) + return; + + _iterate(n->left, it); + + if (n->has_value) + // FIXME: fill out the key + it->visit(it, NULL, NULL, n->value); + + _iterate(n->center, it); + _iterate(n->right, it); +} + +void radix_tree_iterate(struct radix_tree *rt, uint8_t *kb, uint8_t *ke, + struct radix_tree_iterator *it) +{ + if (kb == ke) + _iterate(rt->root, it); + + else { + struct node **pn = _lookup(&rt->root, kb, ke); + struct node *n = *pn; + + if (n) { + if (n->has_value) + it->visit(it, NULL, NULL, n->value); + _iterate(n->center, it); + } + } +} + +bool radix_tree_is_well_formed(struct radix_tree *rt) +{ + return true; +} + +void radix_tree_dump(struct radix_tree *rt, FILE *out) +{ +} + +//---------------------------------------------------------------- + diff --git a/base/data-struct/radix-tree.c b/base/data-struct/radix-tree.c index 222b350..52a1a05 100644 --- a/base/data-struct/radix-tree.c +++ b/base/data-struct/radix-tree.c @@ -10,853 +10,12 @@ // along with this program; if not, write to the Free Software Foundation, // Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA -#include "radix-tree.h" - -#include "base/memory/container_of.h" -#include "base/memory/zalloc.h" - -#include <assert.h> -#include <stdlib.h> -#include <stdio.h> - //---------------------------------------------------------------- -enum node_type { - UNSET = 0, - VALUE, - VALUE_CHAIN, - PREFIX_CHAIN, - NODE4, - NODE16, - NODE48, - NODE256 -}; - -struct value { - enum node_type type; - union radix_value value; -}; - -// This is used for entries that have a key which is a prefix of another key. -struct value_chain { - union radix_value value; - struct value child; -}; - -struct prefix_chain { - struct value child; - unsigned len; - uint8_t prefix[0]; -}; - -struct node4 { - uint32_t nr_entries; - uint8_t keys[4]; - struct value values[4]; -}; - -struct node16 { - uint32_t nr_entries; - uint8_t keys[16]; - struct value values[16]; -}; - -struct node48 { - uint32_t nr_entries; - uint8_t keys[256]; - struct value values[48]; -}; - -struct node256 { - uint32_t nr_entries; - struct value values[256]; -}; - -struct radix_tree { - unsigned nr_entries; - struct value root; - radix_value_dtr dtr; - void *dtr_context; -}; - -//---------------------------------------------------------------- - -struct radix_tree *radix_tree_create(radix_value_dtr dtr, void *dtr_context) -{ - struct radix_tree *rt = malloc(sizeof(*rt)); - - if (rt) { - rt->nr_entries = 0; - rt->root.type = UNSET; - rt->dtr = dtr; - rt->dtr_context = dtr_context; - } - - return rt; -} - -static inline void _dtr(struct radix_tree *rt, union radix_value v) -{ - if (rt->dtr) - rt->dtr(rt->dtr_context, v); -} - -// Returns the number of values removed -static unsigned _free_node(struct radix_tree *rt, struct value v) -{ - unsigned i, nr = 0; - struct value_chain *vc; - struct prefix_chain *pc; - struct node4 *n4; - struct node16 *n16; - struct node48 *n48; - struct node256 *n256; - - switch (v.type) { - case UNSET: - break; - - case VALUE: - _dtr(rt, v.value); - nr = 1; - break; - - case VALUE_CHAIN: - vc = v.value.ptr; - _dtr(rt, vc->value); - nr = 1 + _free_node(rt, vc->child); - free(vc); - break; - - case PREFIX_CHAIN: - pc = v.value.ptr; - nr = _free_node(rt, pc->child); - free(pc); - break; - - case NODE4: - n4 = (struct node4 *) v.value.ptr; - for (i = 0; i < n4->nr_entries; i++) - nr += _free_node(rt, n4->values[i]); - free(n4); - break; - - case NODE16: - n16 = (struct node16 *) v.value.ptr; - for (i = 0; i < n16->nr_entries; i++) - nr += _free_node(rt, n16->values[i]); - free(n16); - break; - - case NODE48: - n48 = (struct node48 *) v.value.ptr; - for (i = 0; i < n48->nr_entries; i++) - nr += _free_node(rt, n48->values[i]); - free(n48); - break; - - case NODE256: - n256 = (struct node256 *) v.value.ptr; - for (i = 0; i < 256; i++) - nr += _free_node(rt, n256->values[i]); - free(n256); - break; - } - - return nr; -} - -void radix_tree_destroy(struct radix_tree *rt) -{ - _free_node(rt, rt->root); - free(rt); -} - -unsigned radix_tree_size(struct radix_tree *rt) -{ - return rt->nr_entries; -} - -static bool _insert(struct radix_tree *rt, struct value *v, uint8_t *kb, uint8_t *ke, union radix_value rv); - -static bool _insert_unset(struct radix_tree *rt, struct value *v, uint8_t *kb, uint8_t *ke, union radix_value rv) -{ - unsigned len = ke - kb; - - if (!len) { - // value - v->type = VALUE; - v->value = rv; - rt->nr_entries++; - } else { - // prefix -> value - struct prefix_chain *pc = zalloc(sizeof(*pc) + len); - if (!pc) - return false; - - pc->child.type = VALUE; - pc->child.value = rv; - pc->len = len; - memcpy(pc->prefix, kb, len); - v->type = PREFIX_CHAIN; - v->value.ptr = pc; - rt->nr_entries++; - } - - return true; -} - -static bool _insert_value(struct radix_tree *rt, struct value *v, uint8_t *kb, uint8_t *ke, union radix_value rv) -{ - unsigned len = ke - kb; - - if (!len) - // overwrite - v->value = rv; - - else { - // value_chain -> value - struct value_chain *vc = zalloc(sizeof(*vc)); - if (!vc) - return false; - - vc->value = v->value; - if (!_insert(rt, &vc->child, kb, ke, rv)) { - free(vc); - return false; - } - - v->type = VALUE_CHAIN; - v->value.ptr = vc; - } - - return true; -} - -static bool _insert_value_chain(struct radix_tree *rt, struct value *v, uint8_t *kb, uint8_t *ke, union radix_value rv) -{ - struct value_chain *vc = v->value.ptr; - return _insert(rt, &vc->child, kb, ke, rv); -} - -static unsigned min(unsigned lhs, unsigned rhs) -{ - if (lhs <= rhs) - return lhs; - else - return rhs; -} - -static bool _insert_prefix_chain(struct radix_tree *rt, struct value *v, uint8_t *kb, uint8_t *ke, union radix_value rv) -{ - struct prefix_chain *pc = v->value.ptr; - - if (*kb == pc->prefix[0]) { - // There's a common prefix let's split the chain into two and - // recurse. - struct prefix_chain *pc2; - unsigned i, len = min(pc->len, ke - kb); - - for (i = 0; i < len; i++) - if (kb[i] != pc->prefix[i]) - break; - - pc2 = zalloc(sizeof(*pc2) + pc->len - i); - pc2->len = pc->len - i; - memmove(pc2->prefix, pc->prefix + i, pc2->len); - pc2->child = pc->child; - - // FIXME: this trashes pc so we can't back out - pc->child.type = PREFIX_CHAIN; - pc->child.value.ptr = pc2; - pc->len = i; - - if (!_insert(rt, &pc->child, kb + i, ke, rv)) { - free(pc2); - return false; - } - - } else { - // Stick an n4 in front. - struct node4 *n4 = zalloc(sizeof(*n4)); - if (!n4) - return false; - - n4->keys[0] = *kb; - if (!_insert(rt, n4->values, kb + 1, ke, rv)) { - free(n4); - return false; - } - - if (pc->len) { - n4->keys[1] = pc->prefix[0]; - if (pc->len == 1) { - n4->values[1] = pc->child; - free(pc); - } else { - memmove(pc->prefix, pc->prefix + 1, pc->len - 1); - pc->len--; - n4->values[1] = *v; - } - n4->nr_entries = 2; - } else - n4->nr_entries = 1; - - v->type = NODE4; - v->value.ptr = n4; - } - - return true; -} - -static bool _insert_node4(struct radix_tree *rt, struct value *v, uint8_t *kb, uint8_t *ke, union radix_value rv) -{ - struct node4 *n4 = v->value.ptr; - if (n4->nr_entries == 4) { - struct node16 *n16 = zalloc(sizeof(*n16)); - if (!n16) - return false; - - n16->nr_entries = 5; - memcpy(n16->keys, n4->keys, sizeof(n4->keys)); - memcpy(n16->values, n4->values, sizeof(n4->values)); - - n16->keys[4] = *kb; - if (!_insert(rt, n16->values + 4, kb + 1, ke, rv)) { - free(n16); - return false; - } - free(n4); - v->type = NODE16; - v->value.ptr = n16; - } else { - n4 = v->value.ptr; - if (!_insert(rt, n4->values + n4->nr_entries, kb + 1, ke, rv)) - return false; - - n4->keys[n4->nr_entries] = *kb; - n4->nr_entries++; - } - return true; -} - -static bool _insert_node16(struct radix_tree *rt, struct value *v, uint8_t *kb, uint8_t *ke, union radix_value rv) -{ - struct node16 *n16 = v->value.ptr; - - if (n16->nr_entries == 16) { - unsigned i; - struct node48 *n48 = zalloc(sizeof(*n48)); - - if (!n48) - return false; - - n48->nr_entries = 17; - memset(n48->keys, 48, sizeof(n48->keys)); - - for (i = 0; i < 16; i++) { - n48->keys[n16->keys[i]] = i; - n48->values[i] = n16->values[i]; - } - - n48->keys[*kb] = 16; - if (!_insert(rt, n48->values + 16, kb + 1, ke, rv)) { - free(n48); - return false; - } - - free(n16); - v->type = NODE48; - v->value.ptr = n48; - } else { - if (!_insert(rt, n16->values + n16->nr_entries, kb + 1, ke, rv)) - return false; - n16->keys[n16->nr_entries] = *kb; - n16->nr_entries++; - } - - return true; -} - -static bool _insert_node48(struct radix_tree *rt, struct value *v, uint8_t *kb, uint8_t *ke, union radix_value rv) -{ - struct node48 *n48 = v->value.ptr; - if (n48->nr_entries == 48) { - unsigned i; - struct node256 *n256 = zalloc(sizeof(*n256)); - if (!n256) - return false; - - for (i = 0; i < 256; i++) { - if (n48->keys[i] >= 48) - continue; - - n256->values[i] = n48->values[n48->keys[i]]; - } - - if (!_insert(rt, n256->values + *kb, kb + 1, ke, rv)) { - free(n256); - return false; - } - - free(n48); - v->type = NODE256; - v->value.ptr = n256; - - } else { - if (!_insert(rt, n48->values + n48->nr_entries, kb + 1, ke, rv)) - return false; - - n48->keys[*kb] = n48->nr_entries; - n48->nr_entries++; - } - - return true; -} - -static bool _insert_node256(struct radix_tree *rt, struct value *v, uint8_t *kb, uint8_t *ke, union radix_value rv) -{ - struct node256 *n256 = v->value.ptr; - bool was_unset = n256->values[*kb].type == UNSET; - - if (!_insert(rt, n256->values + *kb, kb + 1, ke, rv)) - return false; - - if (was_unset) - n256->nr_entries++; - - return true; -} - -// FIXME: the tree should not be touched if insert fails (eg, OOM) -static bool _insert(struct radix_tree *rt, struct value *v, uint8_t *kb, uint8_t *ke, union radix_value rv) -{ - if (kb == ke) { - if (v->type == UNSET) { - v->type = VALUE; - v->value = rv; - rt->nr_entries++; - - } else if (v->type == VALUE) { - v->value = rv; - - } else { - struct value_chain *vc = zalloc(sizeof(*vc)); - if (!vc) - return false; - - vc->value = rv; - vc->child = *v; - v->type = VALUE_CHAIN; - v->value.ptr = vc; - rt->nr_entries++; - } - return true; - } - - switch (v->type) { - case UNSET: - return _insert_unset(rt, v, kb, ke, rv); - - case VALUE: - return _insert_value(rt, v, kb, ke, rv); - - case VALUE_CHAIN: - return _insert_value_chain(rt, v, kb, ke, rv); - - case PREFIX_CHAIN: - return _insert_prefix_chain(rt, v, kb, ke, rv); - - case NODE4: - return _insert_node4(rt, v, kb, ke, rv); - - case NODE16: - return _insert_node16(rt, v, kb, ke, rv); - - case NODE48: - return _insert_node48(rt, v, kb, ke, rv); - - case NODE256: - return _insert_node256(rt, v, kb, ke, rv); - } - - // can't get here - return false; -} - -struct lookup_result { - struct value *v; - uint8_t *kb; -}; - -static struct lookup_result _lookup_prefix(struct value *v, uint8_t *kb, uint8_t *ke) -{ - unsigned i; - struct value_chain *vc; - struct prefix_chain *pc; - struct node4 *n4; - struct node16 *n16; - struct node48 *n48; - struct node256 *n256; - - if (kb == ke) - return (struct lookup_result) {.v = v, .kb = kb}; - - switch (v->type) { - case UNSET: - case VALUE: - break; - - case VALUE_CHAIN: - vc = v->value.ptr; - return _lookup_prefix(&vc->child, kb, ke); - - case PREFIX_CHAIN: - pc = v->value.ptr; - if (ke - kb < pc->len) - return (struct lookup_result) {.v = v, .kb = kb}; - - for (i = 0; i < pc->len; i++) - if (kb[i] != pc->prefix[i]) - return (struct lookup_result) {.v = v, .kb = kb}; - - return _lookup_prefix(&pc->child, kb + pc->len, ke); - - case NODE4: - n4 = v->value.ptr; - for (i = 0; i < n4->nr_entries; i++) - if (n4->keys[i] == *kb) - return _lookup_prefix(n4->values + i, kb + 1, ke); - break; - - case NODE16: - // FIXME: use binary search or simd? - n16 = v->value.ptr; - for (i = 0; i < n16->nr_entries; i++) - if (n16->keys[i] == *kb) - return _lookup_prefix(n16->values + i, kb + 1, ke); - break; - - case NODE48: - n48 = v->value.ptr; - i = n48->keys[*kb]; - if (i < 48) - return _lookup_prefix(n48->values + i, kb + 1, ke); - break; - - case NODE256: - n256 = v->value.ptr; - return _lookup_prefix(n256->values + *kb, kb + 1, ke); - } - - return (struct lookup_result) {.v = v, .kb = kb}; -} - -bool radix_tree_insert(struct radix_tree *rt, uint8_t *kb, uint8_t *ke, union radix_value rv) -{ - struct lookup_result lr = _lookup_prefix(&rt->root, kb, ke); - return _insert(rt, lr.v, lr.kb, ke, rv); -} - -// Note the degrade functions also free the original node. -static void _degrade_to_n4(struct node16 *n16, struct value *result) -{ - struct node4 *n4 = zalloc(sizeof(*n4)); - - n4->nr_entries = n16->nr_entries; - memcpy(n4->keys, n16->keys, n16->nr_entries * sizeof(*n4->keys)); - memcpy(n4->values, n16->values, n16->nr_entries * sizeof(*n4->values)); - free(n16); - - result->type = NODE4; - result->value.ptr = n4; -} - -static void _degrade_to_n16(struct node48 *n48, struct value *result) -{ - struct node4 *n16 = zalloc(sizeof(*n16)); - - n16->nr_entries = n48->nr_entries; - memcpy(n16->keys, n48->keys, n48->nr_entries * sizeof(*n16->keys)); - memcpy(n16->values, n48->values, n48->nr_entries * sizeof(*n16->values)); - free(n48); - - result->type = NODE16; - result->value.ptr = n16; -} - -static void _degrade_to_n48(struct node256 *n256, struct value *result) -{ - unsigned i, count = 0; - struct node4 *n48 = zalloc(sizeof(*n48)); - - n48->nr_entries = n256->nr_entries; - for (i = 0; i < 256; i++) { - if (n256->values[i].type == UNSET) - continue; - - n48->keys[count] = i; - n48->values[count] = n256->values[i]; - count++; - } - free(n256); - - result->type = NODE48; - result->value.ptr = n48; -} - -static bool _remove(struct radix_tree *rt, struct value *root, uint8_t *kb, uint8_t *ke) -{ - bool r; - unsigned i; - struct value_chain *vc; - struct prefix_chain *pc; - struct node4 *n4; - struct node16 *n16; - struct node48 *n48; - struct node256 *n256; - - if (kb == ke) { - if (root->type == VALUE) { - root->type = UNSET; - _dtr(rt, root->value); - return true; - - } else if (root->type == VALUE_CHAIN) { - vc = root->value.ptr; - _dtr(rt, vc->value); - memcpy(root, &vc->child, sizeof(*root)); - free(vc); - return true; - - } else - return false; - } - - switch (root->type) { - case UNSET: - case VALUE: - // this is a value for a prefix of the key - return false; - - case VALUE_CHAIN: - vc = root->value.ptr; - r = _remove(rt, &vc->child, kb, ke); - if (r && (vc->child.type == UNSET)) { - memcpy(root, &vc->child, sizeof(*root)); - free(vc); - } - return r; - - case PREFIX_CHAIN: - pc = root->value.ptr; - if (ke - kb < pc->len) - return false; - - for (i = 0; i < pc->len; i++) - if (kb[i] != pc->prefix[i]) - return false; - - return _remove(rt, &pc->child, kb + pc->len, ke); - - case NODE4: - n4 = root->value.ptr; - for (i = 0; i < n4->nr_entries; i++) { - if (n4->keys[i] == *kb) { - r = _remove(rt, n4->values + i, kb + 1, ke); - if (r && n4->values[i].type == UNSET) { - n4->nr_entries--; - if (i < n4->nr_entries) - // slide the entries down - memmove(n4->keys + i, n4->keys + i + 1, - sizeof(*n4->keys) * (n4->nr_entries - i)); - if (!n4->nr_entries) - root->type = UNSET; - } - return r; - } - } - return false; - - case NODE16: - n16 = root->value.ptr; - for (i = 0; i < n16->nr_entries; i++) { - if (n16->keys[i] == *kb) { - r = _remove(rt, n16->values + i, kb + 1, ke); - if (r && n16->values[i].type == UNSET) { - n16->nr_entries--; - if (i < n16->nr_entries) - // slide the entries down - memmove(n16->keys + i, n16->keys + i + 1, - sizeof(*n16->keys) * (n16->nr_entries - i)); - if (n16->nr_entries <= 4) - _degrade_to_n4(n16, root); - } - return r; - } - } - return false; - - case NODE48: - n48 = root->value.ptr; - i = n48->keys[*kb]; - if (i < 48) { - r = _remove(rt, n48->values + i, kb + 1, ke); - if (r && n48->values[i].type == UNSET) { - n48->keys[*kb] = 48; - n48->nr_entries--; - if (n48->nr_entries <= 16) - _degrade_to_n16(n48, root); - } - return r; - } - return false; - - case NODE256: - n256 = root->value.ptr; - r = _remove(rt, n256->values + (*kb), kb + 1, ke); - if (r && n256->values[*kb].type == UNSET) { - n256->nr_entries--; - if (n256->nr_entries <= 48) - _degrade_to_n48(n256, root); - } - return r; - } - - return false; -} - -bool radix_tree_remove(struct radix_tree *rt, uint8_t *key_begin, uint8_t *key_end) -{ - if (_remove(rt, &rt->root, key_begin, key_end)) { - rt->nr_entries--; - return true; - } - - return false; -} - -static bool _prefix_chain_matches(struct lookup_result *lr, uint8_t *ke) -{ - // It's possible the top node is a prefix chain, and - // the remaining key matches part of it. - if (lr->v->type == PREFIX_CHAIN) { - unsigned i, rlen = ke - lr->kb; - struct prefix_chain *pc = lr->v->value.ptr; - if (rlen < pc->len) { - for (i = 0; i < rlen; i++) - if (pc->prefix[i] != lr->kb[i]) - return false; - return true; - } - } - - return false; -} - -unsigned radix_tree_remove_prefix(struct radix_tree *rt, uint8_t *kb, uint8_t *ke) -{ - unsigned count = 0; - struct lookup_result lr = _lookup_prefix(&rt->root, kb, ke); - if (lr.kb == ke || _prefix_chain_matches(&lr, ke)) { - count = _free_node(rt, *lr.v); - lr.v->type = UNSET; - } - - rt->nr_entries -= count; - return count; -} - -bool radix_tree_lookup(struct radix_tree *rt, - uint8_t *kb, uint8_t *ke, union radix_value *result) -{ - struct value_chain *vc; - struct lookup_result lr = _lookup_prefix(&rt->root, kb, ke); - if (lr.kb == ke) { - switch (lr.v->type) { - case VALUE: - *result = lr.v->value; - return true; - - case VALUE_CHAIN: - vc = lr.v->value.ptr; - *result = vc->value; - return true; - - default: - return false; - } - } - - return false; -} - -// FIXME: build up the keys too -static bool _iterate(struct value *v, struct radix_tree_iterator *it) -{ - unsigned i; - struct value_chain *vc; - struct prefix_chain *pc; - struct node4 *n4; - struct node16 *n16; - struct node48 *n48; - struct node256 *n256; - - switch (v->type) { - case UNSET: - // can't happen - break; - - case VALUE: - return it->visit(it, NULL, NULL, v->value); - - case VALUE_CHAIN: - vc = v->value.ptr; - return it->visit(it, NULL, NULL, vc->value) && _iterate(&vc->child, it); - - case PREFIX_CHAIN: - pc = v->value.ptr; - return _iterate(&pc->child, it); - - case NODE4: - n4 = (struct node4 *) v->value.ptr; - for (i = 0; i < n4->nr_entries; i++) - if (!_iterate(n4->values + i, it)) - return false; - return true; - - case NODE16: - n16 = (struct node16 *) v->value.ptr; - for (i = 0; i < n16->nr_entries; i++) - if (!_iterate(n16->values + i, it)) - return false; - return true; - - case NODE48: - n48 = (struct node48 *) v->value.ptr; - for (i = 0; i < n48->nr_entries; i++) - if (!_iterate(n48->values + i, it)) - return false; - return true; - - case NODE256: - n256 = (struct node256 *) v->value.ptr; - for (i = 0; i < 256; i++) - if (n256->values[i].type != UNSET && !_iterate(n256->values + i, it)) - return false; - return true; - } - - // can't get here - return false; -} - -void radix_tree_iterate(struct radix_tree *rt, uint8_t *kb, uint8_t *ke, - struct radix_tree_iterator *it) -{ - struct lookup_result lr = _lookup_prefix(&rt->root, kb, ke); - if (lr.kb == ke || _prefix_chain_matches(&lr, ke)) - _iterate(lr.v, it); -} +#ifdef SIMPLE_RADIX_TREE +#include "base/data-struct/radix-tree-simple.c" +#else +#include "base/data-struct/radix-tree-adaptive.c" +#endif //---------------------------------------------------------------- diff --git a/base/data-struct/radix-tree.h b/base/data-struct/radix-tree.h index 1b6aee8..5d4d04c 100644 --- a/base/data-struct/radix-tree.h +++ b/base/data-struct/radix-tree.h @@ -15,6 +15,7 @@ #include <stdbool.h> #include <stdint.h> +#include <stdio.h> //---------------------------------------------------------------- @@ -53,6 +54,11 @@ struct radix_tree_iterator { void radix_tree_iterate(struct radix_tree *rt, uint8_t *kb, uint8_t *ke, struct radix_tree_iterator *it); +// Checks that some constraints on the shape of the tree are +// being held. For debug only. +bool radix_tree_is_well_formed(struct radix_tree *rt); +void radix_tree_dump(struct radix_tree *rt, FILE *out); + //---------------------------------------------------------------- #endif diff --git a/make.tmpl.in b/make.tmpl.in index c8e4f14..e7780e8 100644 --- a/make.tmpl.in +++ b/make.tmpl.in @@ -68,7 +68,15 @@ CLDFLAGS += @CLDFLAGS@ ELDFLAGS += @ELDFLAGS@ LDDEPS += @LDDEPS@ LIB_SUFFIX = @LIB_SUFFIX@ -LVMINTERNAL_LIBS = -llvm-internal $(DMEVENT_LIBS) $(DAEMON_LIBS) $(SYSTEMD_LIBS) $(UDEV_LIBS) $(DL_LIBS) $(BLKID_LIBS) +LVMINTERNAL_LIBS =\ + -llvm-internal \ + $(top_builddir)/base/libbase.a \ + $(DMEVENT_LIBS) \ + $(DAEMON_LIBS) \ + $(SYSTEMD_LIBS) \ + $(UDEV_LIBS) \ + $(DL_LIBS) \ + $(BLKID_LIBS) DL_LIBS = @DL_LIBS@ RT_LIBS = @RT_LIBS@ M_LIBS = @M_LIBS@ @@ -306,7 +314,7 @@ LIB_VERSION_DM := $(shell $(AWK) -F '.' '{printf "%s.%s",$$1,$$2}' $(top_srcdir) LIB_VERSION_APP := $(shell $(AWK) -F '[(). ]' '{printf "%s.%s",$$1,$$4}' $(top_srcdir)/VERSION) -INCLUDES += -I$(srcdir) -I$(top_builddir)/include +INCLUDES += -I$(top_srcdir) -I$(srcdir) -I$(top_builddir)/include INC_LNS = $(top_builddir)/include/.symlinks_created diff --git a/test/unit/radix_tree_t.c b/test/unit/radix_tree_t.c index 7266a8a..54bc406 100644 --- a/test/unit/radix_tree_t.c +++ b/test/unit/radix_tree_t.c @@ -10,11 +10,10 @@ // along with this program; if not, write to the Free Software Foundation, // Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA +#include "units.h" #include "base/data-struct/radix-tree.h" #include "base/memory/container_of.h" -#include "units.h" - #include <stdio.h> #include <stdlib.h> @@ -44,6 +43,7 @@ static void test_insert_one(void *fixture) unsigned char k = 'a'; v.n = 65; T_ASSERT(radix_tree_insert(rt, &k, &k + 1, v)); + T_ASSERT(radix_tree_is_well_formed(rt)); v.n = 0; T_ASSERT(radix_tree_lookup(rt, &k, &k + 1, &v)); T_ASSERT_EQUAL(v.n, 65); @@ -62,6 +62,8 @@ static void test_single_byte_keys(void *fixture) T_ASSERT(radix_tree_insert(rt, &k, &k + 1, v)); } + T_ASSERT(radix_tree_is_well_formed(rt)); + for (i = 0; i < count; i++) { k = i; T_ASSERT(radix_tree_lookup(rt, &k, &k + 1, &v)); @@ -82,12 +84,16 @@ static void test_overwrite_single_byte_keys(void *fixture) T_ASSERT(radix_tree_insert(rt, &k, &k + 1, v)); } + T_ASSERT(radix_tree_is_well_formed(rt)); + for (i = 0; i < count; i++) { k = i; v.n = 1000 + i; T_ASSERT(radix_tree_insert(rt, &k, &k + 1, v)); } + T_ASSERT(radix_tree_is_well_formed(rt)); + for (i = 0; i < count; i++) { k = i; T_ASSERT(radix_tree_lookup(rt, &k, &k + 1, &v)); @@ -109,6 +115,8 @@ static void test_16_bit_keys(void *fixture) T_ASSERT(radix_tree_insert(rt, k, k + sizeof(k), v)); } + T_ASSERT(radix_tree_is_well_formed(rt)); + for (i = 0; i < count; i++) { k[0] = i / 256; k[1] = i % 256; @@ -127,8 +135,10 @@ static void test_prefix_keys(void *fixture) k[1] = 200; v.n = 1024; T_ASSERT(radix_tree_insert(rt, k, k + 1, v)); + T_ASSERT(radix_tree_is_well_formed(rt)); v.n = 2345; T_ASSERT(radix_tree_insert(rt, k, k + 2, v)); + T_ASSERT(radix_tree_is_well_formed(rt)); T_ASSERT(radix_tree_lookup(rt, k, k + 1, &v)); T_ASSERT_EQUAL(v.n, 1024); T_ASSERT(radix_tree_lookup(rt, k, k + 2, &v)); @@ -145,8 +155,10 @@ static void test_prefix_keys_reversed(void *fixture) k[1] = 200; v.n = 1024; T_ASSERT(radix_tree_insert(rt, k, k + 2, v)); + T_ASSERT(radix_tree_is_well_formed(rt)); v.n = 2345; T_ASSERT(radix_tree_insert(rt, k, k + 1, v)); + T_ASSERT(radix_tree_is_well_formed(rt)); T_ASSERT(radix_tree_lookup(rt, k, k + 2, &v)); T_ASSERT_EQUAL(v.n, 1024); T_ASSERT(radix_tree_lookup(rt, k, k + 1, &v)); @@ -170,7 +182,10 @@ static void test_sparse_keys(void *fixture) _gen_key(k, k + sizeof(k)); v.n = 1234; T_ASSERT(radix_tree_insert(rt, k, k + 32, v)); + // FIXME: remove + //T_ASSERT(radix_tree_is_well_formed(rt)); } + T_ASSERT(radix_tree_is_well_formed(rt)); } static void test_remove_one(void *fixture) @@ -182,7 +197,9 @@ static void test_remove_one(void *fixture) _gen_key(k, k + sizeof(k)); v.n = 1234; T_ASSERT(radix_tree_insert(rt, k, k + sizeof(k), v)); + T_ASSERT(radix_tree_is_well_formed(rt)); T_ASSERT(radix_tree_remove(rt, k, k + sizeof(k))); + T_ASSERT(radix_tree_is_well_formed(rt)); T_ASSERT(!radix_tree_lookup(rt, k, k + sizeof(k), &v)); } @@ -199,14 +216,19 @@ static void test_remove_one_byte_keys(void *fixture) T_ASSERT(radix_tree_insert(rt, k, k + 1, v)); } + T_ASSERT(radix_tree_is_well_formed(rt)); for (i = 0; i < 256; i++) { k[0] = i; T_ASSERT(radix_tree_remove(rt, k, k + 1)); + T_ASSERT(radix_tree_is_well_formed(rt)); for (j = i + 1; j < 256; j++) { k[0] = j; T_ASSERT(radix_tree_lookup(rt, k, k + 1, &v)); - T_ASSERT_EQUAL(v.n, j + 1000); + if (v.n != j + 1000) + test_fail("v.n (%u) != j + 1000 (%u)\n", + (unsigned) v.n, + (unsigned) j + 1000); } } @@ -216,6 +238,40 @@ static void test_remove_one_byte_keys(void *fixture) } } +static void test_remove_one_byte_keys_reversed(void *fixture) +{ + struct radix_tree *rt = fixture; + unsigned i, j; + uint8_t k[1]; + union radix_value v; + + for (i = 0; i < 256; i++) { + k[0] = i; + v.n = i + 1000; + T_ASSERT(radix_tree_insert(rt, k, k + 1, v)); + } + + T_ASSERT(radix_tree_is_well_formed(rt)); + for (i = 256; i; i--) { + k[0] = i - 1; + T_ASSERT(radix_tree_remove(rt, k, k + 1)); + T_ASSERT(radix_tree_is_well_formed(rt)); + + for (j = 0; j < i - 1; j++) { + k[0] = j; + T_ASSERT(radix_tree_lookup(rt, k, k + 1, &v)); + if (v.n != j + 1000) + test_fail("v.n (%u) != j + 1000 (%u)\n", + (unsigned) v.n, + (unsigned) j + 1000); + } + } + + for (i = 0; i < 256; i++) { + k[0] = i; + T_ASSERT(!radix_tree_lookup(rt, k, k + 1, &v)); + } +} static void test_remove_prefix_keys(void *fixture) { struct radix_tree *rt = fixture; @@ -230,8 +286,10 @@ static void test_remove_prefix_keys(void *fixture) T_ASSERT(radix_tree_insert(rt, k, k + i, v)); } + T_ASSERT(radix_tree_is_well_formed(rt)); for (i = 0; i < 32; i++) { T_ASSERT(radix_tree_remove(rt, k, k + i)); + T_ASSERT(radix_tree_is_well_formed(rt)); for (j = i + 1; j < 32; j++) { T_ASSERT(radix_tree_lookup(rt, k, k + j, &v)); T_ASSERT_EQUAL(v.n, j); @@ -256,8 +314,10 @@ static void test_remove_prefix_keys_reversed(void *fixture) T_ASSERT(radix_tree_insert(rt, k, k + i, v)); } + T_ASSERT(radix_tree_is_well_formed(rt)); for (i = 0; i < 32; i++) { T_ASSERT(radix_tree_remove(rt, k, k + (31 - i))); + T_ASSERT(radix_tree_is_well_formed(rt)); for (j = 0; j < 31 - i; j++) { T_ASSERT(radix_tree_lookup(rt, k, k + j, &v)); T_ASSERT_EQUAL(v.n, j); @@ -284,9 +344,12 @@ static void test_remove_prefix(void *fixture) T_ASSERT(radix_tree_insert(rt, k, k + sizeof(k), v)); } + T_ASSERT(radix_tree_is_well_formed(rt)); + // remove keys in a sub range k[0] = 21; T_ASSERT_EQUAL(radix_tree_remove_prefix(rt, k, k + 1), count); + T_ASSERT(radix_tree_is_well_formed(rt)); } static void test_remove_prefix_single(void *fixture) @@ -298,7 +361,9 @@ static void test_remove_prefix_single(void *fixture) _gen_key(k, k + sizeof(k)); v.n = 1234; T_ASSERT(radix_tree_insert(rt, k, k + sizeof(k), v)); + T_ASSERT(radix_tree_is_well_formed(rt)); T_ASSERT_EQUAL(radix_tree_remove_prefix(rt, k, k + 2), 1); + T_ASSERT(radix_tree_is_well_formed(rt)); } static void test_size(void *fixture) @@ -318,6 +383,7 @@ static void test_size(void *fixture) } T_ASSERT_EQUAL(radix_tree_size(rt), 10000 - dup_count); + T_ASSERT(radix_tree_is_well_formed(rt)); } struct visitor { @@ -348,6 +414,7 @@ static void test_iterate_all(void *fixture) T_ASSERT(radix_tree_insert(rt, k, k + sizeof(k), v)); } + T_ASSERT(radix_tree_is_well_formed(rt)); vt.count = 0; vt.it.visit = _visit; radix_tree_iterate(rt, NULL, NULL, &vt.it); @@ -371,6 +438,7 @@ static void test_iterate_subset(void *fixture) T_ASSERT(radix_tree_insert(rt, k, k + sizeof(k), v)); } + T_ASSERT(radix_tree_is_well_formed(rt)); vt.count = 0; vt.it.visit = _visit; k[0] = 21; @@ -390,6 +458,7 @@ static void test_iterate_single(void *fixture) v.n = 1234; T_ASSERT(radix_tree_insert(rt, k, k + sizeof(k), v)); + T_ASSERT(radix_tree_is_well_formed(rt)); vt.count = 0; vt.it.visit = _visit; radix_tree_iterate(rt, k, k + 3, &vt.it); @@ -411,6 +480,7 @@ static void test_iterate_vary_middle(void *fixture) T_ASSERT(radix_tree_insert(rt, k, k + sizeof(k), v)); } + T_ASSERT(radix_tree_is_well_formed(rt)); vt.it.visit = _visit; for (i = 0; i < 16; i++) { vt.count = 0; @@ -422,6 +492,323 @@ static void test_iterate_vary_middle(void *fixture) //---------------------------------------------------------------- +#define DTR_COUNT 100 + +struct counter { + unsigned c; + uint8_t present[DTR_COUNT]; +}; + +static void _counting_dtr(void *context, union radix_value v) +{ + struct counter *c = context; + c->c++; + T_ASSERT(v.n < DTR_COUNT); + c->present[v.n] = 0; +} + +static void test_remove_calls_dtr(void *fixture) +{ + struct counter c; + struct radix_tree *rt = radix_tree_create(_counting_dtr, &c); + T_ASSERT(rt); + + // Bug hunting, so I need the keys to be deterministic + srand(0); + + c.c = 0; + memset(c.present, 1, sizeof(c.present)); + + { + unsigned i; + uint8_t keys[DTR_COUNT * 3]; + union radix_value v; + + // generate and insert a lot of keys + for (i = 0; i < DTR_COUNT; i++) { + bool found = false; + do { + v.n = i; + uint8_t *k = keys + (i * 3); + _gen_key(k, k + 3); + if (!radix_tree_lookup(rt, k, k + 3, &v)) { + T_ASSERT(radix_tree_insert(rt, k, k + 3, v)); + found = true; + } + + } while (!found); + } + + T_ASSERT(radix_tree_is_well_formed(rt)); + + // double check + for (i = 0; i < DTR_COUNT; i++) { + uint8_t *k = keys + (i * 3); + T_ASSERT(radix_tree_lookup(rt, k, k + 3, &v)); + } + + for (i = 0; i < DTR_COUNT; i++) { + uint8_t *k = keys + (i * 3); + // FIXME: check the values get passed to the dtr + T_ASSERT(radix_tree_remove(rt, k, k + 3)); + } + + T_ASSERT(c.c == DTR_COUNT); + for (i = 0; i < DTR_COUNT; i++) + T_ASSERT(!c.present[i]); + } + + radix_tree_destroy(rt); +} + +static void test_destroy_calls_dtr(void *fixture) +{ + unsigned i; + struct counter c; + struct radix_tree *rt = radix_tree_create(_counting_dtr, &c); + T_ASSERT(rt); + + // Bug hunting, so I need the keys to be deterministic + srand(0); + + c.c = 0; + memset(c.present, 1, sizeof(c.present)); + + { + uint8_t keys[DTR_COUNT * 3]; + union radix_value v; + + // generate and insert a lot of keys + for (i = 0; i < DTR_COUNT; i++) { + bool found = false; + do { + v.n = i; + uint8_t *k = keys + (i * 3); + _gen_key(k, k + 3); + if (!radix_tree_lookup(rt, k, k + 3, &v)) { + T_ASSERT(radix_tree_insert(rt, k, k + 3, v)); + found = true; + } + + } while (!found); + } + + T_ASSERT(radix_tree_is_well_formed(rt)); + } + + radix_tree_destroy(rt); + T_ASSERT(c.c == DTR_COUNT); + for (i = 0; i < DTR_COUNT; i++) + T_ASSERT(!c.present[i]); +} + +//---------------------------------------------------------------- + +static void test_bcache_scenario(void *fixture) +{ + struct radix_tree *rt = fixture; + + unsigned i; + uint8_t k[6]; + union radix_value v; + + memset(k, 0, sizeof(k)); + + for (i = 0; i < 3; i++) { + // it has to be the 4th byte that varies to + // trigger the bug. + k[4] = i; + v.n = i; + T_ASSERT(radix_tree_insert(rt, k, k + sizeof(k), v)); + } + T_ASSERT(radix_tree_is_well_formed(rt)); + + k[4] = 0; + T_ASSERT(radix_tree_remove(rt, k, k + sizeof(k))); + T_ASSERT(radix_tree_is_well_formed(rt)); + + k[4] = i; + v.n = i; + T_ASSERT(radix_tree_insert(rt, k, k + sizeof(k), v)); + T_ASSERT(radix_tree_is_well_formed(rt)); +} + +//---------------------------------------------------------------- + +static void _bcs2_step1(struct radix_tree *rt) +{ + unsigned i; + uint8_t k[12]; + union radix_value v; + + memset(k, 0, sizeof(k)); + for (i = 0x6; i < 0x69; i++) { + k[0] = i; + v.n = i; + T_ASSERT(radix_tree_insert(rt, k, k + sizeof(k), v)); + } + T_ASSERT(radix_tree_is_well_formed(rt)); +} + +static void _bcs2_step2(struct radix_tree *rt) +{ + unsigned i; + uint8_t k[12]; + + memset(k, 0, sizeof(k)); + for (i = 0x6; i < 0x69; i++) { + k[0] = i; + radix_tree_remove_prefix(rt, k, k + 4); + } + T_ASSERT(radix_tree_is_well_formed(rt)); +} + +static void test_bcache_scenario2(void *fixture) +{ + unsigned i; + struct radix_tree *rt = fixture; + uint8_t k[12]; + union radix_value v; + + _bcs2_step1(rt); + _bcs2_step2(rt); + + memset(k, 0, sizeof(k)); + for (i = 0; i < 50; i++) { + k[0] = 0x6; + v.n = 0x6; + T_ASSERT(radix_tree_insert(rt, k, k + sizeof(k), v)); + radix_tree_remove_prefix(rt, k, k + 4); + } + T_ASSERT(radix_tree_is_well_formed(rt)); + + _bcs2_step1(rt); + _bcs2_step2(rt); + _bcs2_step1(rt); + _bcs2_step2(rt); + + memset(k, 0, sizeof(k)); + for(i = 0x6; i < 0x37; i++) { + k[0] = i; + k[4] = 0xf; + k[5] = 0x1; + T_ASSERT(radix_tree_insert(rt, k, k + sizeof(k), v)); + k[4] = 0; + k[5] = 0; + T_ASSERT(radix_tree_insert(rt, k, k + sizeof(k), v)); + } + T_ASSERT(radix_tree_is_well_formed(rt)); + + memset(k, 0, sizeof(k)); + for (i = 0x38; i < 0x69; i++) { + k[0] = i - 0x32; + k[4] = 0xf; + k[5] = 1; + T_ASSERT(radix_tree_remove(rt, k, k + sizeof(k))); + + k[0] = i; + T_ASSERT(radix_tree_insert(rt, k, k + sizeof(k), v)); + + k[0] = i - 0x32; + k[4] = 0; + k[5] = 0; + T_ASSERT(radix_tree_remove(rt, k, k + sizeof(k))); + + k[0] = i; + T_ASSERT(radix_tree_insert(rt, k, k + sizeof(k), v)); + } + T_ASSERT(radix_tree_is_well_formed(rt)); + + memset(k, 0, sizeof(k)); + k[0] = 0x6; + radix_tree_remove_prefix(rt, k, k + 4); + T_ASSERT(radix_tree_is_well_formed(rt)); + + k[0] = 0x38; + k[4] = 0xf; + k[5] = 0x1; + T_ASSERT(radix_tree_remove(rt, k, k + sizeof(k))); + T_ASSERT(radix_tree_is_well_formed(rt)); + + memset(k, 0, sizeof(k)); + k[0] = 0x6; + T_ASSERT(radix_tree_insert(rt, k, k + sizeof(k), v)); + T_ASSERT(radix_tree_is_well_formed(rt)); + + k[0] = 0x7; + radix_tree_remove_prefix(rt, k, k + 4); + T_ASSERT(radix_tree_is_well_formed(rt)); + + k[0] = 0x38; + T_ASSERT(radix_tree_remove(rt, k, k + sizeof(k))); + T_ASSERT(radix_tree_is_well_formed(rt)); + + k[0] = 7; + T_ASSERT(radix_tree_insert(rt, k, k + sizeof(k), v)); + T_ASSERT(radix_tree_is_well_formed(rt)); +} + +//---------------------------------------------------------------- + +struct key_parts { + uint32_t fd; + uint64_t b; +} __attribute__ ((packed)); + +union key { + struct key_parts parts; + uint8_t bytes[12]; +}; + +static void __lookup_matches(struct radix_tree *rt, int fd, uint64_t b, uint64_t expected) +{ + union key k; + union radix_value v; + + k.parts.fd = fd; + k.parts.b = b; + T_ASSERT(radix_tree_lookup(rt, k.bytes, k.bytes + sizeof(k.bytes), &v)); + T_ASSERT(v.n == expected); +} + +static void __lookup_fails(struct radix_tree *rt, int fd, uint64_t b) +{ + union key k; + union radix_value v; + + k.parts.fd = fd; + k.parts.b = b; + T_ASSERT(!radix_tree_lookup(rt, k.bytes, k.bytes + sizeof(k.bytes), &v)); +} + +static void __insert(struct radix_tree *rt, int fd, uint64_t b, uint64_t n) +{ + union key k; + union radix_value v; + + k.parts.fd = fd; + k.parts.b = b; + v.n = n; + T_ASSERT(radix_tree_insert(rt, k.bytes, k.bytes + sizeof(k.bytes), v)); +} + +static void __invalidate(struct radix_tree *rt, int fd) +{ + union key k; + + k.parts.fd = fd; + radix_tree_remove_prefix(rt, k.bytes, k.bytes + sizeof(k.parts.fd)); + radix_tree_is_well_formed(rt); +} + +static void test_bcache_scenario3(void *fixture) +{ + struct radix_tree *rt = fixture; + + #include "test/unit/rt_case1.c" +} + +//---------------------------------------------------------------- #define T(path, desc, fn) register_test(ts, "/base/data-struct/radix-tree/" path, desc, fn) void radix_tree_tests(struct dm_list *all_tests) @@ -442,6 +829,7 @@ void radix_tree_tests(struct dm_list *all_tests) T("sparse-keys", "see what the memory usage is for sparsely distributed keys", test_sparse_keys); T("remove-one", "remove one entry", test_remove_one); T("remove-one-byte-keys", "remove many one byte keys", test_remove_one_byte_keys); + T("remove-one-byte-keys-reversed", "remove many one byte keys reversed", test_remove_one_byte_keys_reversed); T("remove-prefix-keys", "remove a set of keys that have common prefixes", test_remove_prefix_keys); T("remove-prefix-keys-reversed", "remove a set of keys that have common prefixes (reversed)", test_remove_prefix_keys_reversed); T("remove-prefix", "remove a subrange", test_remove_prefix); @@ -451,6 +839,11 @@ void radix_tree_tests(struct dm_list *all_tests) T("iterate-subset", "iterate a subset of entries in tree", test_iterate_subset); T("iterate-single", "iterate a subset that contains a single entry", test_iterate_single); T("iterate-vary-middle", "iterate keys that vary in the middle", test_iterate_vary_middle); + T("remove-calls-dtr", "remove should call the dtr for the value", test_remove_calls_dtr); + T("destroy-calls-dtr", "destroy should call the dtr for all values", test_destroy_calls_dtr); + T("bcache-scenario", "A specific series of keys from a bcache scenario", test_bcache_scenario); + T("bcache-scenario-2", "A second series of keys from a bcache scenario", test_bcache_scenario2); + T("bcache-scenario-3", "A third series of keys from a bcache scenario", test_bcache_scenario3); dm_list_add(all_tests, &ts->list); } -- 1.8.3.1
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