static enum TDB_ERROR replace_data(struct tdb_context *tdb, struct hash_info *h, struct tdb_data key, struct tdb_data dbuf, tdb_off_t old_off, tdb_len_t old_room, bool growing) { tdb_off_t new_off; enum TDB_ERROR ecode; /* Allocate a new record. */ new_off = alloc(tdb, key.dsize, dbuf.dsize, h->h, TDB_USED_MAGIC, growing); if (TDB_OFF_IS_ERR(new_off)) { return new_off; } /* We didn't like the existing one: remove it. */ if (old_off) { tdb->stats.frees++; ecode = add_free_record(tdb, old_off, sizeof(struct tdb_used_record) + key.dsize + old_room, TDB_LOCK_WAIT, true); if (ecode == TDB_SUCCESS) ecode = replace_in_hash(tdb, h, new_off); } else { ecode = add_to_hash(tdb, h, new_off); } if (ecode != TDB_SUCCESS) { return ecode; } new_off += sizeof(struct tdb_used_record); ecode = tdb->methods->twrite(tdb, new_off, key.dptr, key.dsize); if (ecode != TDB_SUCCESS) { return ecode; } new_off += key.dsize; ecode = tdb->methods->twrite(tdb, new_off, dbuf.dptr, dbuf.dsize); if (ecode != TDB_SUCCESS) { return ecode; } if (tdb->flags & TDB_SEQNUM) tdb_inc_seqnum(tdb); return TDB_SUCCESS; }
static enum TDB_ERROR update_data(struct tdb_context *tdb, tdb_off_t off, struct tdb_data dbuf, tdb_len_t extra) { enum TDB_ERROR ecode; ecode = tdb->methods->twrite(tdb, off, dbuf.dptr, dbuf.dsize); if (ecode == TDB_SUCCESS && extra) { /* Put a zero in; future versions may append other data. */ ecode = tdb->methods->twrite(tdb, off + dbuf.dsize, "", 1); } if (tdb->flags & TDB_SEQNUM) tdb_inc_seqnum(tdb); return ecode; }
enum TDB_ERROR tdb_delete(struct tdb_context *tdb, struct tdb_data key) { tdb_off_t off; struct tdb_used_record rec; struct hash_info h; enum TDB_ERROR ecode; if (tdb->flags & TDB_VERSION1) { if (tdb1_delete(tdb, key) == -1) return tdb->last_error; return TDB_SUCCESS; } off = find_and_lock(tdb, key, F_WRLCK, &h, &rec, NULL); if (TDB_OFF_IS_ERR(off)) { return tdb->last_error = TDB_OFF_TO_ERR(off); } if (!off) { ecode = TDB_ERR_NOEXIST; goto unlock; } ecode = delete_from_hash(tdb, &h); if (ecode != TDB_SUCCESS) { goto unlock; } /* Free the deleted entry. */ tdb->stats.frees++; ecode = add_free_record(tdb, off, sizeof(struct tdb_used_record) + rec_key_length(&rec) + rec_data_length(&rec) + rec_extra_padding(&rec), TDB_LOCK_WAIT, true); if (tdb->flags & TDB_SEQNUM) tdb_inc_seqnum(tdb); unlock: tdb_unlock_hashes(tdb, h.hlock_start, h.hlock_range, F_WRLCK); return tdb->last_error = ecode; }