License along with this library; if not, see <http://www.gnu.org/licenses/>.
*/
#include "private.h"
+#include <assert.h>
#include <ccan/likely/likely.h>
void tdb_munmap(struct tdb_context *tdb)
struct stat st;
int ret;
+ /* FIXME: We can't hold pointers during this: we could unmap! */
+ /* (We currently do this in traverse!) */
+// assert(!tdb->direct_access || tdb_has_expansion_lock(tdb));
+
if (len <= tdb->map_size)
return 0;
if (tdb->flags & TDB_INTERNAL) {
return tdb_write_convert(tdb, off, &val, sizeof(val));
}
-/* read a lump of data, allocating the space for it */
-void *tdb_alloc_read(struct tdb_context *tdb, tdb_off_t offset, tdb_len_t len)
+static void *_tdb_alloc_read(struct tdb_context *tdb, tdb_off_t offset,
+ tdb_len_t len, unsigned int prefix)
{
void *buf;
/* some systems don't like zero length malloc */
- buf = malloc(len ? len : 1);
+ buf = malloc(prefix + len ? prefix + len : 1);
if (unlikely(!buf)) {
tdb->ecode = TDB_ERR_OOM;
tdb->log(tdb, TDB_DEBUG_ERROR, tdb->log_priv,
"tdb_alloc_read malloc failed len=%lld\n",
- (long long)len);
- } else if (unlikely(tdb->methods->read(tdb, offset, buf, len))) {
+ (long long)prefix + len);
+ } else if (unlikely(tdb->methods->read(tdb, offset, buf+prefix, len))) {
free(buf);
buf = NULL;
}
return buf;
}
-uint64_t hash_record(struct tdb_context *tdb, tdb_off_t off)
+/* read a lump of data, allocating the space for it */
+void *tdb_alloc_read(struct tdb_context *tdb, tdb_off_t offset, tdb_len_t len)
{
- struct tdb_used_record pad, *r;
- const void *key;
- uint64_t klen, hash;
-
- r = tdb_get(tdb, off, &pad, sizeof(pad));
- if (!r)
- /* FIXME */
- return 0;
-
- klen = rec_key_length(r);
- key = tdb_access_read(tdb, off + sizeof(pad), klen, false);
- if (!key)
- return 0;
-
- hash = tdb_hash(tdb, key, klen);
- tdb_access_release(tdb, key);
- return hash;
+ return _tdb_alloc_read(tdb, offset, len, 0);
}
static int fill(struct tdb_context *tdb,
return 0;
}
+/* This is only neded for tdb_access_commit, but used everywhere to simplify. */
+struct tdb_access_hdr {
+ tdb_off_t off;
+ tdb_len_t len;
+ bool convert;
+};
+
const void *tdb_access_read(struct tdb_context *tdb,
tdb_off_t off, tdb_len_t len, bool convert)
{
- const void *ret = NULL;
+ const void *ret = NULL;
if (likely(!(tdb->flags & TDB_CONVERT)))
ret = tdb_direct(tdb, off, len);
if (!ret) {
- ret = tdb_alloc_read(tdb, off, len);
- if (convert)
- tdb_convert(tdb, (void *)ret, len);
- }
+ struct tdb_access_hdr *hdr;
+ hdr = _tdb_alloc_read(tdb, off, len, sizeof(*hdr));
+ if (hdr) {
+ ret = hdr + 1;
+ if (convert)
+ tdb_convert(tdb, (void *)ret, len);
+ }
+ } else
+ tdb->direct_access++;
+
+ return ret;
+}
+
+void *tdb_access_write(struct tdb_context *tdb,
+ tdb_off_t off, tdb_len_t len, bool convert)
+{
+ void *ret = NULL;
+
+ if (likely(!(tdb->flags & TDB_CONVERT)))
+ ret = tdb_direct(tdb, off, len);
+
+ if (!ret) {
+ struct tdb_access_hdr *hdr;
+ hdr = _tdb_alloc_read(tdb, off, len, sizeof(*hdr));
+ if (hdr) {
+ hdr->off = off;
+ hdr->len = len;
+ hdr->convert = convert;
+ ret = hdr + 1;
+ if (convert)
+ tdb_convert(tdb, (void *)ret, len);
+ }
+ } else
+ tdb->direct_access++;
+
return ret;
}
if (!tdb->map_ptr
|| (char *)p < (char *)tdb->map_ptr
|| (char *)p >= (char *)tdb->map_ptr + tdb->map_size)
- free((void *)p);
+ free((struct tdb_access_hdr *)p - 1);
+ else
+ tdb->direct_access--;
+}
+
+int tdb_access_commit(struct tdb_context *tdb, void *p)
+{
+ int ret = 0;
+
+ if (!tdb->map_ptr
+ || (char *)p < (char *)tdb->map_ptr
+ || (char *)p >= (char *)tdb->map_ptr + tdb->map_size) {
+ struct tdb_access_hdr *hdr;
+
+ hdr = (struct tdb_access_hdr *)p - 1;
+ if (hdr->convert)
+ ret = tdb_write_convert(tdb, hdr->off, p, hdr->len);
+ else
+ ret = tdb_write(tdb, hdr->off, p, hdr->len);
+ free(hdr);
+ } else
+ tdb->direct_access--;
+
+ return ret;
}
#if 0