+++ /dev/null
-/* TDB tools to create various canned database layouts. */
-#include "layout.h"
-#include <stdlib.h>
-#include <string.h>
-#include <assert.h>
-#include <err.h>
-#include "logging.h"
-
-struct tdb_layout *new_tdb_layout(void)
-{
- struct tdb_layout *layout = malloc(sizeof(*layout));
- layout->num_elems = 0;
- layout->elem = NULL;
- return layout;
-}
-
-static void add(struct tdb_layout *layout, union tdb_layout_elem elem)
-{
- layout->elem = realloc(layout->elem,
- sizeof(layout->elem[0])
- * (layout->num_elems+1));
- layout->elem[layout->num_elems++] = elem;
-}
-
-void tdb_layout_add_freetable(struct tdb_layout *layout)
-{
- union tdb_layout_elem elem;
- elem.base.type = FREETABLE;
- add(layout, elem);
-}
-
-void tdb_layout_add_free(struct tdb_layout *layout, tdb_len_t len,
- unsigned ftable)
-{
- union tdb_layout_elem elem;
- elem.base.type = FREE;
- elem.free.len = len;
- elem.free.ftable_num = ftable;
- add(layout, elem);
-}
-
-void tdb_layout_add_capability(struct tdb_layout *layout,
- uint64_t type,
- bool write_breaks,
- bool check_breaks,
- bool open_breaks,
- tdb_len_t extra)
-{
- union tdb_layout_elem elem;
- elem.base.type = CAPABILITY;
- elem.capability.type = type;
- if (write_breaks)
- elem.capability.type |= TDB_CAP_NOWRITE;
- if (open_breaks)
- elem.capability.type |= TDB_CAP_NOOPEN;
- if (check_breaks)
- elem.capability.type |= TDB_CAP_NOCHECK;
- elem.capability.extra = extra;
- add(layout, elem);
-}
-
-static struct tdb_data dup_key(struct tdb_data key)
-{
- struct tdb_data ret;
- ret.dsize = key.dsize;
- ret.dptr = malloc(ret.dsize);
- memcpy(ret.dptr, key.dptr, ret.dsize);
- return ret;
-}
-
-void tdb_layout_add_used(struct tdb_layout *layout,
- TDB_DATA key, TDB_DATA data,
- tdb_len_t extra)
-{
- union tdb_layout_elem elem;
- elem.base.type = DATA;
- elem.used.key = dup_key(key);
- elem.used.data = dup_key(data);
- elem.used.extra = extra;
- add(layout, elem);
-}
-
-static tdb_len_t free_record_len(tdb_len_t len)
-{
- return sizeof(struct tdb_used_record) + len;
-}
-
-static tdb_len_t data_record_len(struct tle_used *used)
-{
- tdb_len_t len;
- len = sizeof(struct tdb_used_record)
- + used->key.dsize + used->data.dsize + used->extra;
- assert(len >= sizeof(struct tdb_free_record));
- return len;
-}
-
-static tdb_len_t hashtable_len(struct tle_hashtable *htable)
-{
- return sizeof(struct tdb_used_record)
- + (sizeof(tdb_off_t) << TDB_SUBLEVEL_HASH_BITS)
- + htable->extra;
-}
-
-static tdb_len_t capability_len(struct tle_capability *cap)
-{
- return sizeof(struct tdb_capability) + cap->extra;
-}
-
-static tdb_len_t freetable_len(struct tle_freetable *ftable)
-{
- return sizeof(struct tdb_freetable);
-}
-
-static void set_free_record(void *mem, tdb_len_t len)
-{
- /* We do all the work in add_to_freetable */
-}
-
-static void add_zero_pad(struct tdb_used_record *u, size_t len, size_t extra)
-{
- if (extra)
- ((char *)(u + 1))[len] = '\0';
-}
-
-static void set_data_record(void *mem, struct tdb_context *tdb,
- struct tle_used *used)
-{
- struct tdb_used_record *u = mem;
-
- set_header(tdb, u, TDB_USED_MAGIC, used->key.dsize, used->data.dsize,
- used->key.dsize + used->data.dsize + used->extra,
- tdb_hash(tdb, used->key.dptr, used->key.dsize));
- memcpy(u + 1, used->key.dptr, used->key.dsize);
- memcpy((char *)(u + 1) + used->key.dsize,
- used->data.dptr, used->data.dsize);
- add_zero_pad(u, used->key.dsize + used->data.dsize, used->extra);
-}
-
-static void set_hashtable(void *mem, struct tdb_context *tdb,
- struct tle_hashtable *htable)
-{
- struct tdb_used_record *u = mem;
- tdb_len_t len = sizeof(tdb_off_t) << TDB_SUBLEVEL_HASH_BITS;
-
- set_header(tdb, u, TDB_HTABLE_MAGIC, 0, len, len + htable->extra, 0);
- memset(u + 1, 0, len);
- add_zero_pad(u, len, htable->extra);
-}
-
-static void set_capability(void *mem, struct tdb_context *tdb,
- struct tle_capability *cap, struct tdb_header *hdr,
- tdb_off_t last_cap)
-{
- struct tdb_capability *c = mem;
- tdb_len_t len = sizeof(*c) - sizeof(struct tdb_used_record) + cap->extra;
-
- c->type = cap->type;
- c->next = 0;
- set_header(tdb, &c->hdr, TDB_CAP_MAGIC, 0, len, len, 0);
-
- /* Append to capability list. */
- if (!last_cap) {
- hdr->capabilities = cap->base.off;
- } else {
- c = (struct tdb_capability *)((char *)hdr + last_cap);
- c->next = cap->base.off;
- }
-}
-
-static void set_freetable(void *mem, struct tdb_context *tdb,
- struct tle_freetable *freetable, struct tdb_header *hdr,
- tdb_off_t last_ftable)
-{
- struct tdb_freetable *ftable = mem;
- memset(ftable, 0, sizeof(*ftable));
- set_header(tdb, &ftable->hdr, TDB_FTABLE_MAGIC, 0,
- sizeof(*ftable) - sizeof(ftable->hdr),
- sizeof(*ftable) - sizeof(ftable->hdr), 0);
-
- if (last_ftable) {
- ftable = (struct tdb_freetable *)((char *)hdr + last_ftable);
- ftable->next = freetable->base.off;
- } else {
- hdr->free_table = freetable->base.off;
- }
-}
-
-static void add_to_freetable(struct tdb_context *tdb,
- tdb_off_t eoff,
- tdb_off_t elen,
- unsigned ftable,
- struct tle_freetable *freetable)
-{
- tdb->tdb2.ftable_off = freetable->base.off;
- tdb->tdb2.ftable = ftable;
- add_free_record(tdb, eoff, sizeof(struct tdb_used_record) + elen,
- TDB_LOCK_WAIT, false);
-}
-
-static tdb_off_t hbucket_off(tdb_off_t group_start, unsigned ingroup)
-{
- return group_start
- + (ingroup % (1 << TDB_HASH_GROUP_BITS)) * sizeof(tdb_off_t);
-}
-
-/* Get bits from a value. */
-static uint32_t bits(uint64_t val, unsigned start, unsigned num)
-{
- assert(num <= 32);
- return (val >> start) & ((1U << num) - 1);
-}
-
-/* We take bits from the top: that way we can lock whole sections of the hash
- * by using lock ranges. */
-static uint32_t use_bits(uint64_t h, unsigned num, unsigned *used)
-{
- *used += num;
- return bits(h, 64 - *used, num);
-}
-
-static tdb_off_t encode_offset(tdb_off_t new_off, unsigned bucket,
- uint64_t h)
-{
- return bucket
- | new_off
- | ((uint64_t)bits(h, 64 - TDB_OFF_UPPER_STEAL_EXTRA,
- TDB_OFF_UPPER_STEAL_EXTRA)
- << TDB_OFF_HASH_EXTRA_BIT);
-}
-
-/* FIXME: Our hash table handling here is primitive: we don't expand! */
-static void add_to_hashtable(struct tdb_context *tdb,
- tdb_off_t eoff,
- struct tdb_data key)
-{
- uint64_t h = tdb_hash(tdb, key.dptr, key.dsize);
- tdb_off_t b_off, group_start;
- unsigned i, group, in_group;
- unsigned used = 0;
-
- group = use_bits(h, TDB_TOPLEVEL_HASH_BITS-TDB_HASH_GROUP_BITS, &used);
- in_group = use_bits(h, TDB_HASH_GROUP_BITS, &used);
-
- group_start = offsetof(struct tdb_header, hashtable)
- + group * (sizeof(tdb_off_t) << TDB_HASH_GROUP_BITS);
-
- for (i = 0; i < (1 << TDB_HASH_GROUP_BITS); i++) {
- unsigned bucket = (in_group + i) % (1 << TDB_HASH_GROUP_BITS);
-
- b_off = hbucket_off(group_start, bucket);
- if (tdb_read_off(tdb, b_off) == 0) {
- tdb_write_off(tdb, b_off,
- encode_offset(eoff, in_group, h));
- return;
- }
- }
- abort();
-}
-
-static struct tle_freetable *find_ftable(struct tdb_layout *layout, unsigned num)
-{
- unsigned i;
-
- for (i = 0; i < layout->num_elems; i++) {
- if (layout->elem[i].base.type != FREETABLE)
- continue;
- if (num == 0)
- return &layout->elem[i].ftable;
- num--;
- }
- abort();
-}
-
-/* FIXME: Support TDB_CONVERT */
-struct tdb_context *tdb_layout_get(struct tdb_layout *layout,
- void (*freefn)(void *),
- union tdb_attribute *attr)
-{
- unsigned int i;
- tdb_off_t off, len, last_ftable, last_cap;
- char *mem;
- struct tdb_context *tdb;
-
- off = sizeof(struct tdb_header);
-
- /* First pass of layout: calc lengths */
- for (i = 0; i < layout->num_elems; i++) {
- union tdb_layout_elem *e = &layout->elem[i];
- e->base.off = off;
- switch (e->base.type) {
- case FREETABLE:
- len = freetable_len(&e->ftable);
- break;
- case FREE:
- len = free_record_len(e->free.len);
- break;
- case DATA:
- len = data_record_len(&e->used);
- break;
- case HASHTABLE:
- len = hashtable_len(&e->hashtable);
- break;
- case CAPABILITY:
- len = capability_len(&e->capability);
- break;
- default:
- abort();
- }
- off += len;
- }
-
- mem = malloc(off);
- /* Fill with some weird pattern. */
- memset(mem, 0x99, off);
- /* Now populate our header, cribbing from a real TDB header. */
- tdb = tdb_open(NULL, TDB_INTERNAL, O_RDWR, 0, attr);
- memcpy(mem, tdb->file->map_ptr, sizeof(struct tdb_header));
-
- /* Mug the tdb we have to make it use this. */
- freefn(tdb->file->map_ptr);
- tdb->file->map_ptr = mem;
- tdb->file->map_size = off;
-
- last_ftable = 0;
- last_cap = 0;
- for (i = 0; i < layout->num_elems; i++) {
- union tdb_layout_elem *e = &layout->elem[i];
- switch (e->base.type) {
- case FREETABLE:
- set_freetable(mem + e->base.off, tdb, &e->ftable,
- (struct tdb_header *)mem, last_ftable);
- last_ftable = e->base.off;
- break;
- case FREE:
- set_free_record(mem + e->base.off, e->free.len);
- break;
- case DATA:
- set_data_record(mem + e->base.off, tdb, &e->used);
- break;
- case HASHTABLE:
- set_hashtable(mem + e->base.off, tdb, &e->hashtable);
- break;
- case CAPABILITY:
- set_capability(mem + e->base.off, tdb, &e->capability,
- (struct tdb_header *)mem, last_cap);
- last_cap = e->base.off;
- break;
- }
- }
- /* Must have a free table! */
- assert(last_ftable);
-
- /* Now fill the free and hash tables. */
- for (i = 0; i < layout->num_elems; i++) {
- union tdb_layout_elem *e = &layout->elem[i];
- switch (e->base.type) {
- case FREE:
- add_to_freetable(tdb, e->base.off, e->free.len,
- e->free.ftable_num,
- find_ftable(layout, e->free.ftable_num));
- break;
- case DATA:
- add_to_hashtable(tdb, e->base.off, e->used.key);
- break;
- default:
- break;
- }
- }
-
- tdb->tdb2.ftable_off = find_ftable(layout, 0)->base.off;
- return tdb;
-}
-
-void tdb_layout_write(struct tdb_layout *layout, void (*freefn)(void *),
- union tdb_attribute *attr, const char *filename)
-{
- struct tdb_context *tdb = tdb_layout_get(layout, freefn, attr);
- int fd;
-
- fd = open(filename, O_WRONLY|O_TRUNC|O_CREAT, 0600);
- if (fd < 0)
- err(1, "opening %s for writing", filename);
- if (write(fd, tdb->file->map_ptr, tdb->file->map_size)
- != tdb->file->map_size)
- err(1, "writing %s", filename);
- close(fd);
- tdb_close(tdb);
-}
-
-void tdb_layout_free(struct tdb_layout *layout)
-{
- unsigned int i;
-
- for (i = 0; i < layout->num_elems; i++) {
- if (layout->elem[i].base.type == DATA) {
- free(layout->elem[i].used.key.dptr);
- free(layout->elem[i].used.data.dptr);
- }
- }
- free(layout->elem);
- free(layout);
-}
projects / ccan / blobdiff