if (tdb->flags & TDB_NOMMAP)
return;
- tdb->file->map_ptr = mmap(NULL, tdb->file->map_size, tdb->mmap_flags,
- MAP_SHARED, tdb->file->fd, 0);
+ /* size_t can be smaller than off_t. */
+ if ((size_t)tdb->file->map_size == tdb->file->map_size) {
+ tdb->file->map_ptr = mmap(NULL, tdb->file->map_size,
+ tdb->mmap_flags,
+ MAP_SHARED, tdb->file->fd, 0);
+ } else
+ tdb->file->map_ptr = MAP_FAILED;
/*
* NB. When mmap fails it returns MAP_FAILED *NOT* NULL !!!!
/* Endian conversion: we only ever deal with 8 byte quantities */
void *tdb_convert(const struct tdb_context *tdb, void *buf, tdb_len_t size)
{
+ assert(size % 8 == 0);
if (unlikely((tdb->flags & TDB_CONVERT)) && buf) {
uint64_t i, *p = (uint64_t *)buf;
for (i = 0; i < size / 8; i++)
static void *_tdb_alloc_read(struct tdb_context *tdb, tdb_off_t offset,
tdb_len_t len, unsigned int prefix)
{
- void *buf;
+ unsigned char *buf;
enum TDB_ERROR ecode;
/* some systems don't like zero length malloc */
const void *tdb_access_read(struct tdb_context *tdb,
tdb_off_t off, tdb_len_t len, bool convert)
{
- const void *ret = NULL;
+ void *ret = NULL;
if (likely(!(tdb->flags & TDB_CONVERT))) {
ret = tdb->methods->direct(tdb, off, len, false);
return (char *)tdb->file->map_ptr + off;
}
-void add_stat_(struct tdb_context *tdb, uint64_t *s, size_t val)
+void tdb_inc_seqnum(struct tdb_context *tdb)
{
- if ((uintptr_t)s < (uintptr_t)tdb->stats + tdb->stats->size)
- *s += val;
+ tdb_off_t seq;
+
+ if (likely(!(tdb->flags & TDB_CONVERT))) {
+ int64_t *direct;
+
+ direct = tdb->methods->direct(tdb,
+ offsetof(struct tdb_header,
+ seqnum),
+ sizeof(*direct), true);
+ if (likely(direct)) {
+ /* Don't let it go negative, even briefly */
+ if (unlikely((*direct) + 1) < 0)
+ *direct = 0;
+ (*direct)++;
+ return;
+ }
+ }
+
+ seq = tdb_read_off(tdb, offsetof(struct tdb_header, seqnum));
+ if (!TDB_OFF_IS_ERR(seq)) {
+ seq++;
+ if (unlikely((int64_t)seq < 0))
+ seq = 0;
+ tdb_write_off(tdb, offsetof(struct tdb_header, seqnum), seq);
+ }
}
static const struct tdb_methods io_methods = {