unsigned int rnd, max = 0, count = 0;
tdb_off_t off;
- tdb->ftable_off = off = first_ftable(tdb);
- tdb->ftable = 0;
+ tdb->tdb2.ftable_off = off = first_ftable(tdb);
+ tdb->tdb2.ftable = 0;
while (off) {
if (TDB_OFF_IS_ERR(off)) {
rnd = random();
if (rnd >= max) {
- tdb->ftable_off = off;
- tdb->ftable = count;
+ tdb->tdb2.ftable_off = off;
+ tdb->tdb2.ftable = count;
max = rnd;
}
return head;
/* We only need to set ftable_and_len; rest is set in enqueue_in_free */
- new.ftable_and_len = ((uint64_t)tdb->ftable << (64 - TDB_OFF_UPPER_STEAL))
+ new.ftable_and_len = ((uint64_t)tdb->tdb2.ftable << (64 - TDB_OFF_UPPER_STEAL))
| len;
/* new->next = head. */
tdb_off_t off;
unsigned int i;
- if (likely(tdb->ftable == ftable))
- return tdb->ftable_off;
+ if (likely(tdb->tdb2.ftable == ftable))
+ return tdb->tdb2.ftable_off;
off = first_ftable(tdb);
for (i = 0; i < ftable; i++) {
}
/* Did we just mess up a record you were hoping to use? */
- if (end == *protect)
+ if (end == *protect) {
+ tdb->stats.alloc_coalesce_iterate_clash++;
*protect = TDB_ERR_NOEXIST;
+ }
ecode = remove_from_list(tdb, nb_off, end, &rec);
check_list(tdb, nb_off);
return 0;
/* Before we expand, check this isn't one you wanted protected? */
- if (off == *protect)
+ if (off == *protect) {
*protect = TDB_ERR_EXISTS;
+ tdb->stats.alloc_coalesce_iterate_clash++;
+ }
/* OK, expand initial record */
ecode = tdb_read_convert(tdb, off, &rec, sizeof(rec));
ecode = add_free_record(tdb, off, end - off, TDB_LOCK_NOWAIT, false);
if (ecode != TDB_SUCCESS) {
/* Need to drop lock. Can't rely on anything stable. */
+ tdb->stats.alloc_coalesce_lockfail++;
*protect = TDB_ERR_CORRUPT;
/* We have to drop this to avoid deadlocks, so make sure record
goto err;
}
- tdb->stats.alloc_coalesce_succeeded++;
tdb_unlock_free_bucket(tdb, b_off);
ecode = add_free_record(tdb, off, end - off, TDB_LOCK_WAIT,
/* For simplicity, we always drop lock if they can't continue */
tdb_unlock_free_bucket(tdb, b_off);
}
+ tdb->stats.alloc_coalesce_succeeded++;
/* Return usable length. */
return end - off - sizeof(struct tdb_used_record);
/* List is locked: we unlock it. */
static enum TDB_ERROR coalesce_list(struct tdb_context *tdb,
- tdb_off_t ftable_off, tdb_off_t b_off)
+ tdb_off_t ftable_off,
+ tdb_off_t b_off,
+ unsigned int limit)
{
enum TDB_ERROR ecode;
tdb_off_t off;
ecode = off;
goto unlock_err;
}
- /* A little bit of paranoia */
+ /* A little bit of paranoia: counter should be 0. */
off &= TDB_OFF_MASK;
- while (off) {
+ while (off && limit--) {
struct tdb_free_record rec;
tdb_len_t coal;
tdb_off_t next;
/* Coalescing had to unlock, so stop. */
return TDB_SUCCESS;
}
+ /* Keep going if we're doing well... */
+ limit += size_to_bucket(coal / 16 + TDB_MIN_DATA_LEN);
off = next;
}
+ /* Now, move those elements to the tail of the list so we get something
+ * else next time. */
+ if (off) {
+ struct tdb_free_record oldhrec, newhrec, oldtrec, newtrec;
+ tdb_off_t oldhoff, oldtoff, newtoff;
+
+ /* The record we were up to is the new head. */
+ ecode = tdb_read_convert(tdb, off, &newhrec, sizeof(newhrec));
+ if (ecode != TDB_SUCCESS)
+ goto unlock_err;
+
+ /* Get the new tail. */
+ newtoff = frec_prev(&newhrec);
+ ecode = tdb_read_convert(tdb, newtoff, &newtrec,
+ sizeof(newtrec));
+ if (ecode != TDB_SUCCESS)
+ goto unlock_err;
+
+ /* Get the old head. */
+ oldhoff = tdb_read_off(tdb, b_off);
+ if (TDB_OFF_IS_ERR(oldhoff)) {
+ ecode = oldhoff;
+ goto unlock_err;
+ }
+
+ /* This could happen if they all coalesced away. */
+ if (oldhoff == off)
+ goto out;
+
+ ecode = tdb_read_convert(tdb, oldhoff, &oldhrec,
+ sizeof(oldhrec));
+ if (ecode != TDB_SUCCESS)
+ goto unlock_err;
+
+ /* Get the old tail. */
+ oldtoff = frec_prev(&oldhrec);
+ ecode = tdb_read_convert(tdb, oldtoff, &oldtrec,
+ sizeof(oldtrec));
+ if (ecode != TDB_SUCCESS)
+ goto unlock_err;
+
+ /* Old tail's next points to old head. */
+ oldtrec.next = oldhoff;
+
+ /* Old head's prev points to old tail. */
+ oldhrec.magic_and_prev
+ = (TDB_FREE_MAGIC << (64 - TDB_OFF_UPPER_STEAL))
+ | oldtoff;
+
+ /* New tail's next is 0. */
+ newtrec.next = 0;
+
+ /* Write out the modified versions. */
+ ecode = tdb_write_convert(tdb, oldtoff, &oldtrec,
+ sizeof(oldtrec));
+ if (ecode != TDB_SUCCESS)
+ goto unlock_err;
+
+ ecode = tdb_write_convert(tdb, oldhoff, &oldhrec,
+ sizeof(oldhrec));
+ if (ecode != TDB_SUCCESS)
+ goto unlock_err;
+
+ ecode = tdb_write_convert(tdb, newtoff, &newtrec,
+ sizeof(newtrec));
+ if (ecode != TDB_SUCCESS)
+ goto unlock_err;
+
+ /* And finally link in new head. */
+ ecode = tdb_write_off(tdb, b_off, off);
+ if (ecode != TDB_SUCCESS)
+ goto unlock_err;
+ }
+out:
tdb_unlock_free_bucket(tdb, b_off);
return TDB_SUCCESS;
len = len_with_header - sizeof(struct tdb_used_record);
- b_off = bucket_off(tdb->ftable_off, size_to_bucket(len));
+ b_off = bucket_off(tdb->tdb2.ftable_off, size_to_bucket(len));
ecode = tdb_lock_free_bucket(tdb, b_off, waitflag);
if (ecode != TDB_SUCCESS) {
return ecode;
/* Coalescing unlocks free list. */
if (!ecode && coalesce)
- ecode = coalesce_list(tdb, tdb->ftable_off, b_off);
+ ecode = coalesce_list(tdb, tdb->tdb2.ftable_off, b_off, 2);
else
tdb_unlock_free_bucket(tdb, b_off);
return ecode;
/* For futureproofing, we put a 0 in any unused space. */
if (rec_extra_padding(&rec)) {
- ecode = tdb->methods->twrite(tdb, best_off + sizeof(rec)
+ ecode = tdb->tdb2.io->twrite(tdb, best_off + sizeof(rec)
+ keylen + datalen, "", 1);
if (ecode != TDB_SUCCESS) {
goto unlock_err;
else
start_b = size_to_bucket(adjust_size(keylen, datalen));
- ftable_off = tdb->ftable_off;
- ftable = tdb->ftable;
- while (!wrapped || ftable_off != tdb->ftable_off) {
+ ftable_off = tdb->tdb2.ftable_off;
+ ftable = tdb->tdb2.ftable;
+ while (!wrapped || ftable_off != tdb->tdb2.ftable_off) {
/* Start at exact size bucket, and search up... */
for (b = find_free_head(tdb, ftable_off, start_b);
b < TDB_FREE_BUCKETS;
if (b == TDB_FREE_BUCKETS - 1)
tdb->stats.alloc_bucket_max++;
/* Worked? Stay using this list. */
- tdb->ftable_off = ftable_off;
- tdb->ftable = ftable;
+ tdb->tdb2.ftable_off = ftable_off;
+ tdb->tdb2.ftable = ftable;
return off;
}
/* Didn't work. Try next bucket. */
/* Someone else may have expanded the file, so retry. */
old_size = tdb->file->map_size;
- tdb->methods->oob(tdb, tdb->file->map_size + 1, true);
+ tdb->tdb2.io->oob(tdb, tdb->file->map_size + 1, true);
if (tdb->file->map_size != old_size) {
tdb_unlock_expand(tdb, F_WRLCK);
return TDB_SUCCESS;
/* We need room for the record header too. */
wanted = adjust_size(0, sizeof(struct tdb_used_record) + wanted);
- ecode = tdb->methods->expand_file(tdb, wanted);
+ ecode = tdb->tdb2.io->expand_file(tdb, wanted);
if (ecode != TDB_SUCCESS) {
tdb_unlock_expand(tdb, F_WRLCK);
return ecode;
tdb_off_t off;
/* We can't hold pointers during this: we could unmap! */
- assert(!tdb->direct_access);
+ assert(!tdb->tdb2.direct_access);
for (;;) {
enum TDB_ERROR ecode;
projects / ccan / blobdiff