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@@ -1,450 +1,10 @@
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#include "private.h"
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#include <ccan/asprintf/asprintf.h>
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-#include <ccan/tdb2/tdb2.h>
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-#include <assert.h>
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#include <stdarg.h>
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/* The null return. */
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struct tdb_data tdb_null = { .dptr = NULL, .dsize = 0 };
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-/* all contexts, to ensure no double-opens (fcntl locks don't nest!) */
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-static struct tdb_context *tdbs = NULL;
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-
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-static bool tdb_already_open(dev_t device, ino_t ino)
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-{
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- struct tdb_context *i;
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-
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- for (i = tdbs; i; i = i->next) {
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- if (i->device == device && i->inode == ino) {
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- return true;
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- }
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- }
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-
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- return false;
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-}
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-
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-static bool read_all(int fd, void *buf, size_t len)
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-{
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- while (len) {
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- ssize_t ret;
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- ret = read(fd, buf, len);
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- if (ret < 0)
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- return false;
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- if (ret == 0) {
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- /* ETOOSHORT? */
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- errno = EWOULDBLOCK;
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- return false;
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- }
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- buf = (char *)buf + ret;
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- len -= ret;
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- }
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- return true;
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-}
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-
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-static uint64_t random_number(struct tdb_context *tdb)
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-{
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- int fd;
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- uint64_t ret = 0;
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- struct timeval now;
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-
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- fd = open("/dev/urandom", O_RDONLY);
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- if (fd >= 0) {
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- if (read_all(fd, &ret, sizeof(ret))) {
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- close(fd);
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- return ret;
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- }
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- close(fd);
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- }
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- /* FIXME: Untested! Based on Wikipedia protocol description! */
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- fd = open("/dev/egd-pool", O_RDWR);
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- if (fd >= 0) {
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- /* Command is 1, next byte is size we want to read. */
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- char cmd[2] = { 1, sizeof(uint64_t) };
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- if (write(fd, cmd, sizeof(cmd)) == sizeof(cmd)) {
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- char reply[1 + sizeof(uint64_t)];
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- int r = read(fd, reply, sizeof(reply));
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- if (r > 1) {
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- /* Copy at least some bytes. */
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- memcpy(&ret, reply+1, r - 1);
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- if (reply[0] == sizeof(uint64_t)
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- && r == sizeof(reply)) {
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- close(fd);
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- return ret;
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- }
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- }
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- }
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- close(fd);
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- }
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-
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- /* Fallback: pid and time. */
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- gettimeofday(&now, NULL);
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- ret = getpid() * 100132289ULL + now.tv_sec * 1000000ULL + now.tv_usec;
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- tdb_logerr(tdb, TDB_SUCCESS, TDB_LOG_WARNING,
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- "tdb_open: random from getpid and time");
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- return ret;
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-}
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-
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-struct new_database {
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- struct tdb_header hdr;
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- struct tdb_freetable ftable;
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-};
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-
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-/* initialise a new database */
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-static enum TDB_ERROR tdb_new_database(struct tdb_context *tdb,
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- struct tdb_attribute_seed *seed,
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- struct tdb_header *hdr)
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-{
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- /* We make it up in memory, then write it out if not internal */
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- struct new_database newdb;
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- unsigned int magic_len;
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- ssize_t rlen;
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- enum TDB_ERROR ecode;
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-
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- /* Fill in the header */
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- newdb.hdr.version = TDB_VERSION;
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- if (seed)
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- newdb.hdr.hash_seed = seed->seed;
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- else
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- newdb.hdr.hash_seed = random_number(tdb);
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- newdb.hdr.hash_test = TDB_HASH_MAGIC;
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- newdb.hdr.hash_test = tdb->khash(&newdb.hdr.hash_test,
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- sizeof(newdb.hdr.hash_test),
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- newdb.hdr.hash_seed,
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- tdb->hash_priv);
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- newdb.hdr.recovery = 0;
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- newdb.hdr.features_used = newdb.hdr.features_offered = TDB_FEATURE_MASK;
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- memset(newdb.hdr.reserved, 0, sizeof(newdb.hdr.reserved));
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- /* Initial hashes are empty. */
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- memset(newdb.hdr.hashtable, 0, sizeof(newdb.hdr.hashtable));
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-
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- /* Free is empty. */
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- newdb.hdr.free_table = offsetof(struct new_database, ftable);
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- memset(&newdb.ftable, 0, sizeof(newdb.ftable));
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- ecode = set_header(NULL, &newdb.ftable.hdr, TDB_FTABLE_MAGIC, 0,
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- sizeof(newdb.ftable) - sizeof(newdb.ftable.hdr),
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- sizeof(newdb.ftable) - sizeof(newdb.ftable.hdr),
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- 0);
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- if (ecode != TDB_SUCCESS) {
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- return ecode;
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- }
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-
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- /* Magic food */
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- memset(newdb.hdr.magic_food, 0, sizeof(newdb.hdr.magic_food));
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- strcpy(newdb.hdr.magic_food, TDB_MAGIC_FOOD);
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-
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- /* This creates an endian-converted database, as if read from disk */
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- magic_len = sizeof(newdb.hdr.magic_food);
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- tdb_convert(tdb,
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- (char *)&newdb.hdr + magic_len, sizeof(newdb) - magic_len);
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-
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- *hdr = newdb.hdr;
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-
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- if (tdb->flags & TDB_INTERNAL) {
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- tdb->map_size = sizeof(newdb);
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- tdb->map_ptr = malloc(tdb->map_size);
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- if (!tdb->map_ptr) {
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- return tdb_logerr(tdb, TDB_ERR_OOM, TDB_LOG_ERROR,
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- "tdb_new_database:"
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- " failed to allocate");
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- }
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- memcpy(tdb->map_ptr, &newdb, tdb->map_size);
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- return TDB_SUCCESS;
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- }
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- if (lseek(tdb->fd, 0, SEEK_SET) == -1) {
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- return tdb_logerr(tdb, TDB_ERR_IO, TDB_LOG_ERROR,
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- "tdb_new_database:"
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- " failed to seek: %s", strerror(errno));
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- }
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-
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- if (ftruncate(tdb->fd, 0) == -1) {
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- return tdb_logerr(tdb, TDB_ERR_IO, TDB_LOG_ERROR,
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- "tdb_new_database:"
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- " failed to truncate: %s", strerror(errno));
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- }
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-
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- rlen = write(tdb->fd, &newdb, sizeof(newdb));
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- if (rlen != sizeof(newdb)) {
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- if (rlen >= 0)
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- errno = ENOSPC;
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- return tdb_logerr(tdb, TDB_ERR_IO, TDB_LOG_ERROR,
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- "tdb_new_database: %zi writing header: %s",
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- rlen, strerror(errno));
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- }
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- return TDB_SUCCESS;
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-}
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-
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-struct tdb_context *tdb_open(const char *name, int tdb_flags,
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- int open_flags, mode_t mode,
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- union tdb_attribute *attr)
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-{
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- struct tdb_context *tdb;
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- struct stat st;
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- int saved_errno = 0;
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- uint64_t hash_test;
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- unsigned v;
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- ssize_t rlen;
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- struct tdb_header hdr;
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- struct tdb_attribute_seed *seed = NULL;
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- tdb_bool_err berr;
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- enum TDB_ERROR ecode;
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-
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- tdb = malloc(sizeof(*tdb));
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- if (!tdb) {
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- /* Can't log this */
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- errno = ENOMEM;
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- return NULL;
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- }
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- tdb->name = NULL;
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- tdb->map_ptr = NULL;
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- tdb->direct_access = 0;
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- tdb->fd = -1;
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- tdb->map_size = sizeof(struct tdb_header);
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- tdb->flags = tdb_flags;
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- tdb->logfn = NULL;
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- tdb->transaction = NULL;
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- tdb->stats = NULL;
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- tdb->access = NULL;
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- tdb_hash_init(tdb);
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- tdb_io_init(tdb);
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- tdb_lock_init(tdb);
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-
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- while (attr) {
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- switch (attr->base.attr) {
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- case TDB_ATTRIBUTE_LOG:
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- tdb->logfn = attr->log.log_fn;
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- tdb->log_private = attr->log.log_private;
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- break;
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- case TDB_ATTRIBUTE_HASH:
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- tdb->khash = attr->hash.hash_fn;
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- tdb->hash_priv = attr->hash.hash_private;
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- break;
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- case TDB_ATTRIBUTE_SEED:
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- seed = &attr->seed;
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- break;
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- case TDB_ATTRIBUTE_STATS:
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- tdb->stats = &attr->stats;
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- /* They have stats we don't know about? Tell them. */
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- if (tdb->stats->size > sizeof(attr->stats))
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- tdb->stats->size = sizeof(attr->stats);
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- break;
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- default:
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- ecode = tdb_logerr(tdb, TDB_ERR_EINVAL,
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- TDB_LOG_USE_ERROR,
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- "tdb_open:"
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- " unknown attribute type %u",
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- attr->base.attr);
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- goto fail;
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- }
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- attr = attr->base.next;
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- }
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-
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- if (tdb_flags & ~(TDB_INTERNAL | TDB_NOLOCK | TDB_NOMMAP | TDB_CONVERT
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- | TDB_NOSYNC)) {
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- ecode = tdb_logerr(tdb, TDB_ERR_EINVAL, TDB_LOG_USE_ERROR,
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- "tdb_open: unknown flags %u", tdb_flags);
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- goto fail;
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- }
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-
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- if ((open_flags & O_ACCMODE) == O_WRONLY) {
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- ecode = tdb_logerr(tdb, TDB_ERR_EINVAL, TDB_LOG_USE_ERROR,
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- "tdb_open: can't open tdb %s write-only",
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- name);
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- goto fail;
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- }
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-
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- if ((open_flags & O_ACCMODE) == O_RDONLY) {
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- tdb->read_only = true;
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- tdb->mmap_flags = PROT_READ;
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- } else {
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- tdb->read_only = false;
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- tdb->mmap_flags = PROT_READ | PROT_WRITE;
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- }
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-
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- /* internal databases don't need any of the rest. */
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- if (tdb->flags & TDB_INTERNAL) {
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- tdb->flags |= (TDB_NOLOCK | TDB_NOMMAP);
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- ecode = tdb_new_database(tdb, seed, &hdr);
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- if (ecode != TDB_SUCCESS) {
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- goto fail;
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- }
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- tdb_convert(tdb, &hdr.hash_seed, sizeof(hdr.hash_seed));
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- tdb->hash_seed = hdr.hash_seed;
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- tdb_ftable_init(tdb);
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- return tdb;
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- }
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-
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- if ((tdb->fd = open(name, open_flags, mode)) == -1) {
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- /* errno set by open(2) */
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- saved_errno = errno;
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- ecode = tdb_logerr(tdb, TDB_ERR_IO, TDB_LOG_ERROR,
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- "tdb_open: could not open file %s: %s",
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- name, strerror(errno));
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- goto fail;
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- }
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-
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- /* on exec, don't inherit the fd */
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- v = fcntl(tdb->fd, F_GETFD, 0);
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- fcntl(tdb->fd, F_SETFD, v | FD_CLOEXEC);
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-
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- /* ensure there is only one process initialising at once */
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- ecode = tdb_lock_open(tdb, TDB_LOCK_WAIT|TDB_LOCK_NOCHECK);
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- if (ecode != TDB_SUCCESS) {
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- goto fail;
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- }
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-
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- /* If they used O_TRUNC, read will return 0. */
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- rlen = read(tdb->fd, &hdr, sizeof(hdr));
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- if (rlen == 0 && (open_flags & O_CREAT)) {
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- ecode = tdb_new_database(tdb, seed, &hdr);
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- if (ecode != TDB_SUCCESS) {
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- goto fail;
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- }
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- } else if (rlen < 0) {
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- ecode = tdb_logerr(tdb, TDB_ERR_IO, TDB_LOG_ERROR,
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- "tdb_open: error %s reading %s",
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- strerror(errno), name);
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- goto fail;
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- } else if (rlen < sizeof(hdr)
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- || strcmp(hdr.magic_food, TDB_MAGIC_FOOD) != 0) {
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- ecode = tdb_logerr(tdb, TDB_ERR_IO, TDB_LOG_ERROR,
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- "tdb_open: %s is not a tdb file", name);
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- goto fail;
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- }
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-
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- if (hdr.version != TDB_VERSION) {
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- if (hdr.version == bswap_64(TDB_VERSION))
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- tdb->flags |= TDB_CONVERT;
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- else {
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- /* wrong version */
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- ecode = tdb_logerr(tdb, TDB_ERR_IO, TDB_LOG_ERROR,
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- "tdb_open:"
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- " %s is unknown version 0x%llx",
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- name, (long long)hdr.version);
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- goto fail;
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- }
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- }
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-
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- tdb_convert(tdb, &hdr, sizeof(hdr));
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- tdb->hash_seed = hdr.hash_seed;
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- hash_test = TDB_HASH_MAGIC;
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- hash_test = tdb_hash(tdb, &hash_test, sizeof(hash_test));
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- if (hdr.hash_test != hash_test) {
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- /* wrong hash variant */
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- ecode = tdb_logerr(tdb, TDB_ERR_IO, TDB_LOG_ERROR,
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- "tdb_open:"
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- " %s uses a different hash function",
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- name);
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- goto fail;
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- }
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-
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- if (fstat(tdb->fd, &st) == -1) {
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- saved_errno = errno;
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- ecode = tdb_logerr(tdb, TDB_ERR_IO, TDB_LOG_ERROR,
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- "tdb_open: could not stat open %s: %s",
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- name, strerror(errno));
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- goto fail;
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- }
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-
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- /* Is it already in the open list? If so, fail. */
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- if (tdb_already_open(st.st_dev, st.st_ino)) {
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- /* FIXME */
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- ecode = tdb_logerr(tdb, TDB_ERR_IO, TDB_LOG_USE_ERROR,
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- "tdb_open: %s (%d,%d) is already open"
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- " in this process",
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- name, (int)st.st_dev, (int)st.st_ino);
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- goto fail;
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- }
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-
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- tdb->name = strdup(name);
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- if (!tdb->name) {
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- ecode = tdb_logerr(tdb, TDB_ERR_OOM, TDB_LOG_ERROR,
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- "tdb_open: failed to allocate name");
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- goto fail;
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- }
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-
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- /* Clear any features we don't understand. */
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- if ((open_flags & O_ACCMODE) != O_RDONLY) {
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- hdr.features_used &= TDB_FEATURE_MASK;
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- if (tdb_write_convert(tdb, offsetof(struct tdb_header,
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- features_used),
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- &hdr.features_used,
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- sizeof(hdr.features_used)) == -1)
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- goto fail;
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- }
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-
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- tdb->device = st.st_dev;
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- tdb->inode = st.st_ino;
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- tdb_unlock_open(tdb);
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-
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- /* This make sure we have current map_size and mmap. */
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- tdb->methods->oob(tdb, tdb->map_size + 1, true);
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-
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- /* Now it's fully formed, recover if necessary. */
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- berr = tdb_needs_recovery(tdb);
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- if (unlikely(berr != false)) {
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- if (berr < 0) {
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- ecode = berr;
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|
- goto fail;
|
|
|
- }
|
|
|
- ecode = tdb_lock_and_recover(tdb);
|
|
|
- if (ecode != TDB_SUCCESS) {
|
|
|
- goto fail;
|
|
|
- }
|
|
|
- }
|
|
|
-
|
|
|
- ecode = tdb_ftable_init(tdb);
|
|
|
- if (ecode != TDB_SUCCESS) {
|
|
|
- goto fail;
|
|
|
- }
|
|
|
-
|
|
|
- tdb->next = tdbs;
|
|
|
- tdbs = tdb;
|
|
|
- return tdb;
|
|
|
-
|
|
|
- fail:
|
|
|
- /* Map ecode to some logical errno. */
|
|
|
- if (!saved_errno) {
|
|
|
- switch (ecode) {
|
|
|
- case TDB_ERR_CORRUPT:
|
|
|
- case TDB_ERR_IO:
|
|
|
- saved_errno = EIO;
|
|
|
- break;
|
|
|
- case TDB_ERR_LOCK:
|
|
|
- saved_errno = EWOULDBLOCK;
|
|
|
- break;
|
|
|
- case TDB_ERR_OOM:
|
|
|
- saved_errno = ENOMEM;
|
|
|
- break;
|
|
|
- case TDB_ERR_EINVAL:
|
|
|
- saved_errno = EINVAL;
|
|
|
- break;
|
|
|
- default:
|
|
|
- saved_errno = EINVAL;
|
|
|
- break;
|
|
|
- }
|
|
|
- }
|
|
|
-
|
|
|
-#ifdef TDB_TRACE
|
|
|
- close(tdb->tracefd);
|
|
|
-#endif
|
|
|
- if (tdb->map_ptr) {
|
|
|
- if (tdb->flags & TDB_INTERNAL) {
|
|
|
- free(tdb->map_ptr);
|
|
|
- } else
|
|
|
- tdb_munmap(tdb);
|
|
|
- }
|
|
|
- free(tdb->lockrecs);
|
|
|
- free((char *)tdb->name);
|
|
|
- if (tdb->fd != -1)
|
|
|
- if (close(tdb->fd) != 0)
|
|
|
- tdb_logerr(tdb, TDB_ERR_IO, TDB_LOG_ERROR,
|
|
|
- "tdb_open: failed to close tdb->fd"
|
|
|
- " on error: %s", strerror(errno));
|
|
|
- free(tdb);
|
|
|
- errno = saved_errno;
|
|
|
- return NULL;
|
|
|
-}
|
|
|
-
|
|
|
static enum TDB_ERROR update_rec_hdr(struct tdb_context *tdb,
|
|
|
tdb_off_t off,
|
|
|
tdb_len_t keylen,
|
|
|
@@ -718,46 +278,6 @@ unlock:
|
|
|
return ecode;
|
|
|
}
|
|
|
|
|
|
-int tdb_close(struct tdb_context *tdb)
|
|
|
-{
|
|
|
- struct tdb_context **i;
|
|
|
- int ret = 0;
|
|
|
-
|
|
|
- tdb_trace(tdb, "tdb_close");
|
|
|
-
|
|
|
- if (tdb->transaction) {
|
|
|
- tdb_transaction_cancel(tdb);
|
|
|
- }
|
|
|
-
|
|
|
- if (tdb->map_ptr) {
|
|
|
- if (tdb->flags & TDB_INTERNAL)
|
|
|
- free(tdb->map_ptr);
|
|
|
- else
|
|
|
- tdb_munmap(tdb);
|
|
|
- }
|
|
|
- free((char *)tdb->name);
|
|
|
- if (tdb->fd != -1) {
|
|
|
- ret = close(tdb->fd);
|
|
|
- tdb->fd = -1;
|
|
|
- }
|
|
|
- free(tdb->lockrecs);
|
|
|
-
|
|
|
- /* Remove from contexts list */
|
|
|
- for (i = &tdbs; *i; i = &(*i)->next) {
|
|
|
- if (*i == tdb) {
|
|
|
- *i = tdb->next;
|
|
|
- break;
|
|
|
- }
|
|
|
- }
|
|
|
-
|
|
|
-#ifdef TDB_TRACE
|
|
|
- close(tdb->tracefd);
|
|
|
-#endif
|
|
|
- free(tdb);
|
|
|
-
|
|
|
- return ret;
|
|
|
-}
|
|
|
-
|
|
|
unsigned int tdb_get_flags(struct tdb_context *tdb)
|
|
|
{
|
|
|
return tdb->flags;
|
Rusty Russell