#include "private.h"
+#include <ccan/hash/hash.h>
#include <assert.h>
/* all lock info, to detect double-opens (fcntl file don't nest!) */
return TDB_SUCCESS;
}
+enum TDB_ERROR tdb_set_attribute(struct tdb_context *tdb,
+ const union tdb_attribute *attr)
+{
+ switch (attr->base.attr) {
+ case TDB_ATTRIBUTE_LOG:
+ tdb->log_fn = attr->log.fn;
+ tdb->log_data = attr->log.data;
+ break;
+ case TDB_ATTRIBUTE_HASH:
+ case TDB_ATTRIBUTE_SEED:
+ case TDB_ATTRIBUTE_OPENHOOK:
+ return tdb->last_error
+ = tdb_logerr(tdb, TDB_ERR_EINVAL,
+ TDB_LOG_USE_ERROR,
+ "tdb_set_attribute:"
+ " cannot set %s after opening",
+ attr->base.attr == TDB_ATTRIBUTE_HASH
+ ? "TDB_ATTRIBUTE_HASH"
+ : attr->base.attr == TDB_ATTRIBUTE_SEED
+ ? "TDB_ATTRIBUTE_SEED"
+ : "TDB_ATTRIBUTE_OPENHOOK");
+ case TDB_ATTRIBUTE_FLOCK:
+ tdb->lock_fn = attr->flock.lock;
+ tdb->unlock_fn = attr->flock.unlock;
+ tdb->lock_data = attr->flock.data;
+ break;
+ default:
+ return tdb->last_error
+ = tdb_logerr(tdb, TDB_ERR_EINVAL,
+ TDB_LOG_USE_ERROR,
+ "tdb_set_attribute:"
+ " unknown attribute type %u",
+ attr->base.attr);
+ }
+ return TDB_SUCCESS;
+}
+
+static uint64_t jenkins_hash(const void *key, size_t length, uint64_t seed,
+ void *unused)
+{
+ uint64_t ret;
+ /* hash64_stable assumes lower bits are more important; they are a
+ * slightly better hash. We use the upper bits first, so swap them. */
+ ret = hash64_stable((const unsigned char *)key, length, seed);
+ return (ret >> 32) | (ret << 32);
+}
+
+enum TDB_ERROR tdb_get_attribute(struct tdb_context *tdb,
+ union tdb_attribute *attr)
+{
+ switch (attr->base.attr) {
+ case TDB_ATTRIBUTE_LOG:
+ if (!tdb->log_fn)
+ return tdb->last_error = TDB_ERR_NOEXIST;
+ attr->log.fn = tdb->log_fn;
+ attr->log.data = tdb->log_data;
+ break;
+ case TDB_ATTRIBUTE_HASH:
+ attr->hash.fn = tdb->hash_fn;
+ attr->hash.data = tdb->hash_data;
+ break;
+ case TDB_ATTRIBUTE_SEED:
+ attr->seed.seed = tdb->hash_seed;
+ break;
+ case TDB_ATTRIBUTE_OPENHOOK:
+ return tdb->last_error
+ = tdb_logerr(tdb, TDB_ERR_EINVAL,
+ TDB_LOG_USE_ERROR,
+ "tdb_get_attribute:"
+ " cannot get TDB_ATTRIBUTE_OPENHOOK");
+ case TDB_ATTRIBUTE_STATS:
+ /* FIXME */
+ return TDB_ERR_EINVAL;
+ case TDB_ATTRIBUTE_FLOCK:
+ attr->flock.lock = tdb->lock_fn;
+ attr->flock.unlock = tdb->unlock_fn;
+ attr->flock.data = tdb->lock_data;
+ break;
+ default:
+ return tdb->last_error
+ = tdb_logerr(tdb, TDB_ERR_EINVAL,
+ TDB_LOG_USE_ERROR,
+ "tdb_get_attribute:"
+ " unknown attribute type %u",
+ attr->base.attr);
+ }
+ attr->base.next = NULL;
+ return TDB_SUCCESS;
+}
+
+void tdb_unset_attribute(struct tdb_context *tdb,
+ enum tdb_attribute_type type)
+{
+ switch (type) {
+ case TDB_ATTRIBUTE_LOG:
+ tdb->log_fn = NULL;
+ break;
+ case TDB_ATTRIBUTE_HASH:
+ case TDB_ATTRIBUTE_SEED:
+ case TDB_ATTRIBUTE_OPENHOOK:
+ tdb_logerr(tdb, TDB_ERR_EINVAL, TDB_LOG_USE_ERROR,
+ "tdb_unset_attribute: cannot unset %s after opening",
+ type == TDB_ATTRIBUTE_HASH
+ ? "TDB_ATTRIBUTE_HASH"
+ : type == TDB_ATTRIBUTE_SEED
+ ? "TDB_ATTRIBUTE_SEED"
+ : "TDB_ATTRIBUTE_OPENHOOK");
+ break;
+ case TDB_ATTRIBUTE_STATS:
+ /* FIXME */
+ break;
+ case TDB_ATTRIBUTE_FLOCK:
+ tdb->lock_fn = tdb_fcntl_lock;
+ tdb->unlock_fn = tdb_fcntl_unlock;
+ break;
+ default:
+ tdb_logerr(tdb, TDB_ERR_EINVAL,
+ TDB_LOG_USE_ERROR,
+ "tdb_unset_attribute: unknown attribute type %u",
+ type);
+ }
+}
+
struct tdb_context *tdb_open(const char *name, int tdb_flags,
int open_flags, mode_t mode,
union tdb_attribute *attr)
ssize_t rlen;
struct tdb_header hdr;
struct tdb_attribute_seed *seed = NULL;
+ struct tdb_attribute_openhook *openhook = NULL;
tdb_bool_err berr;
enum TDB_ERROR ecode;
tdb->access = NULL;
tdb->last_error = TDB_SUCCESS;
tdb->file = NULL;
- tdb_hash_init(tdb);
+ tdb->lock_fn = tdb_fcntl_lock;
+ tdb->unlock_fn = tdb_fcntl_unlock;
+ tdb->hash_fn = jenkins_hash;
tdb_io_init(tdb);
while (attr) {
switch (attr->base.attr) {
- case TDB_ATTRIBUTE_LOG:
- tdb->log_fn = attr->log.fn;
- tdb->log_data = attr->log.data;
- break;
case TDB_ATTRIBUTE_HASH:
tdb->hash_fn = attr->hash.fn;
tdb->hash_data = attr->hash.data;
if (tdb->stats->size > sizeof(attr->stats))
tdb->stats->size = sizeof(attr->stats);
break;
+ case TDB_ATTRIBUTE_OPENHOOK:
+ openhook = &attr->openhook;
+ break;
default:
- ecode = tdb_logerr(tdb, TDB_ERR_EINVAL,
- TDB_LOG_USE_ERROR,
- "tdb_open:"
- " unknown attribute type %u",
- attr->base.attr);
- goto fail;
+ /* These are set as normal. */
+ ecode = tdb_set_attribute(tdb, attr);
+ if (ecode != TDB_SUCCESS)
+ goto fail;
}
attr = attr->base.next;
}
/* ensure there is only one process initialising at once */
ecode = tdb_lock_open(tdb, TDB_LOCK_WAIT|TDB_LOCK_NOCHECK);
if (ecode != TDB_SUCCESS) {
- goto fail;
+ saved_errno = errno;
+ goto fail_errno;
+ }
+
+ /* call their open hook if they gave us one. */
+ if (openhook) {
+ ecode = openhook->fn(tdb->file->fd, openhook->data);
+ if (ecode != TDB_SUCCESS) {
+ tdb_logerr(tdb, ecode, TDB_LOG_ERROR,
+ "tdb_open: open hook failed");
+ goto fail;
+ }
+ open_flags |= O_CREAT;
}
/* If they used O_TRUNC, read will return 0. */
projects / ccan / blobdiff