+ /*
+ Trivial Database 2: opening and closing TDBs
+ Copyright (C) Rusty Russell 2010
+
+ This library is free software; you can redistribute it and/or
+ modify it under the terms of the GNU Lesser General Public
+ License as published by the Free Software Foundation; either
+ version 3 of the License, or (at your option) any later version.
+
+ This library is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public
+ License along with this library; if not, see <http://www.gnu.org/licenses/>.
+*/
#include "private.h"
+#include <ccan/hash/hash.h>
#include <assert.h>
/* all lock info, to detect double-opens (fcntl file don't nest!) */
tdb->file = malloc(sizeof(*tdb->file));
if (!tdb->file)
return tdb_logerr(tdb, TDB_ERR_OOM, TDB_LOG_ERROR,
- "tdb_open: could alloc tdb_file structure");
+ "tdb_open: cannot alloc tdb_file structure");
tdb->file->num_lockrecs = 0;
tdb->file->lockrecs = NULL;
tdb->file->allrecord_lock.count = 0;
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_STATS:
+ return tdb->last_error
+ = tdb_logerr(tdb, TDB_ERR_EINVAL,
+ TDB_LOG_USE_ERROR,
+ "tdb_set_attribute:"
+ " cannot set TDB_ATTRIBUTE_STATS");
+ 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: {
+ size_t size = attr->stats.size;
+ if (size > tdb->stats.size)
+ size = tdb->stats.size;
+ memcpy(&attr->stats, &tdb->stats, size);
+ break;
+ }
+ 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:
+ tdb_logerr(tdb, TDB_ERR_EINVAL,
+ TDB_LOG_USE_ERROR,
+ "tdb_unset_attribute:"
+ "cannot unset TDB_ATTRIBUTE_STATS");
+ 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)
struct tdb_attribute_openhook *openhook = NULL;
tdb_bool_err berr;
enum TDB_ERROR ecode;
+ int openlock;
- tdb = malloc(sizeof(*tdb));
+ tdb = malloc(sizeof(*tdb) + (name ? strlen(name) + 1 : 0));
if (!tdb) {
/* Can't log this */
errno = ENOMEM;
return NULL;
}
- tdb->name = NULL;
+ /* Set name immediately for logging functions. */
+ if (name) {
+ tdb->name = strcpy((char *)(tdb + 1), name);
+ } else {
+ tdb->name = NULL;
+ }
tdb->direct_access = 0;
tdb->flags = tdb_flags;
tdb->log_fn = NULL;
tdb->transaction = NULL;
- tdb->stats = NULL;
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;
+ memset(&tdb->stats, 0, sizeof(tdb->stats));
+ tdb->stats.base.attr = TDB_ATTRIBUTE_STATS;
+ tdb->stats.size = sizeof(tdb->stats);
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;
case TDB_ATTRIBUTE_SEED:
seed = &attr->seed;
break;
- case TDB_ATTRIBUTE_STATS:
- tdb->stats = &attr->stats;
- /* They have stats we don't know about? Tell them. */
- 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;
}
if (tdb_flags & ~(TDB_INTERNAL | TDB_NOLOCK | TDB_NOMMAP | TDB_CONVERT
- | TDB_NOSYNC | TDB_SEQNUM)) {
+ | TDB_NOSYNC | TDB_SEQNUM | TDB_ALLOW_NESTING)) {
ecode = tdb_logerr(tdb, TDB_ERR_EINVAL, TDB_LOG_USE_ERROR,
"tdb_open: unknown flags %u", tdb_flags);
goto fail;
if ((open_flags & O_ACCMODE) == O_RDONLY) {
tdb->read_only = true;
tdb->mmap_flags = PROT_READ;
+ openlock = F_RDLCK;
} else {
tdb->read_only = false;
tdb->mmap_flags = PROT_READ | PROT_WRITE;
+ openlock = F_WRLCK;
}
/* internal databases don't need any of the rest. */
if (ecode != TDB_SUCCESS) {
goto fail;
}
- if (name) {
- tdb->name = strdup(name);
- if (!tdb->name) {
- ecode = tdb_logerr(tdb, TDB_ERR_OOM,
- TDB_LOG_ERROR,
- "tdb_open: failed to"
- " allocate name");
- goto fail;
- }
- }
tdb_convert(tdb, &hdr.hash_seed, sizeof(hdr.hash_seed));
tdb->hash_seed = hdr.hash_seed;
tdb_ftable_init(tdb);
tdb_logerr(tdb, TDB_ERR_IO, TDB_LOG_ERROR,
"tdb_open: could not stat open %s: %s",
name, strerror(errno));
+ close(fd);
goto fail_errno;
}
ecode = tdb_new_file(tdb);
- if (ecode != TDB_SUCCESS)
+ if (ecode != TDB_SUCCESS) {
+ close(fd);
goto fail;
+ }
tdb->file->next = files;
tdb->file->fd = fd;
}
/* ensure there is only one process initialising at once */
- ecode = tdb_lock_open(tdb, TDB_LOCK_WAIT|TDB_LOCK_NOCHECK);
+ ecode = tdb_lock_open(tdb, openlock, 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. */
goto fail;
}
- tdb->name = strdup(name);
- if (!tdb->name) {
- ecode = tdb_logerr(tdb, TDB_ERR_OOM, TDB_LOG_ERROR,
- "tdb_open: failed to allocate name");
- goto fail;
- }
-
/* Clear any features we don't understand. */
if ((open_flags & O_ACCMODE) != O_RDONLY) {
hdr.features_used &= TDB_FEATURE_MASK;
goto fail;
}
- tdb_unlock_open(tdb);
+ tdb_unlock_open(tdb, openlock);
/* This make sure we have current map_size and mmap. */
tdb->methods->oob(tdb, tdb->file->map_size + 1, true);
#ifdef TDB_TRACE
close(tdb->tracefd);
#endif
- free(cast_const(char *, tdb->name));
if (tdb->file) {
tdb_lock_cleanup(tdb);
if (--tdb->file->refcnt == 0) {
else
tdb_munmap(tdb->file);
}
- free(cast_const(char *, tdb->name));
if (tdb->file) {
struct tdb_file **i;