/*
* __wt_log_system_record --
* Write a system log record for the previous LSN.
*/
int
__wt_log_system_record(
WT_SESSION_IMPL *session, WT_FH *log_fh, WT_LSN *lsn)
{
WT_DECL_ITEM(logrec_buf);
WT_DECL_RET;
WT_LOG *log;
WT_LOG_RECORD *logrec;
WT_LOGSLOT tmp;
WT_MYSLOT myslot;
const char *fmt = WT_UNCHECKED_STRING(I);
uint32_t rectype = WT_LOGREC_SYSTEM;
size_t recsize;
log = S2C(session)->log;
WT_RET(__wt_logrec_alloc(session, log->allocsize, &logrec_buf));
memset((uint8_t *)logrec_buf->mem, 0, log->allocsize);
WT_ERR(__wt_struct_size(session, &recsize, fmt, rectype));
WT_ERR(__wt_struct_pack(session,
(uint8_t *)logrec_buf->data + logrec_buf->size, recsize, fmt,
rectype));
logrec_buf->size += recsize;
WT_ERR(__wt_logop_prev_lsn_pack(session, logrec_buf, lsn));
WT_ASSERT(session, logrec_buf->size <= log->allocsize);
logrec = (WT_LOG_RECORD *)logrec_buf->mem;
/*
* We know system records are this size. And we have to adjust
* the size now because we're not going through the normal log
* write path and the packing functions needed the correct offset
* earlier.
*/
logrec_buf->size = logrec->len = log->allocsize;
/* We do not compress nor encrypt this record. */
logrec->checksum = 0;
logrec->flags = 0;
__wt_log_record_byteswap(logrec);
logrec->checksum = __wt_checksum(logrec, log->allocsize);
#ifdef WORDS_BIGENDIAN
logrec->checksum = __wt_bswap32(logrec->checksum);
#endif
WT_CLEAR(tmp);
memset(&myslot, 0, sizeof(myslot));
myslot.slot = &tmp;
__wt_log_slot_activate(session, &tmp);
/*
* Override the file handle to the one we're using.
*/
tmp.slot_fh = log_fh;
WT_ERR(__wt_log_fill(session, &myslot, true, logrec_buf, NULL));
err: __wt_logrec_free(session, &logrec_buf);
return (ret);
}
/*
* __wt_log_slot_init --
* Initialize the slot array.
*/
int
__wt_log_slot_init(WT_SESSION_IMPL *session, bool alloc)
{
WT_CONNECTION_IMPL *conn;
WT_DECL_RET;
WT_LOG *log;
WT_LOGSLOT *slot;
int32_t i;
conn = S2C(session);
log = conn->log;
for (i = 0; i < WT_SLOT_POOL; i++)
log->slot_pool[i].slot_state = WT_LOG_SLOT_FREE;
/*
* Allocate memory for buffers now that the arrays are setup. Separate
* this from the loop above to make error handling simpler.
*/
/*
* !!! If the buffer size is too close to the log file size, we will
* switch log files very aggressively. Scale back the buffer for
* small log file sizes.
*/
if (alloc) {
log->slot_buf_size = (uint32_t)WT_MIN(
(size_t)conn->log_file_max / 10, WT_LOG_SLOT_BUF_SIZE);
for (i = 0; i < WT_SLOT_POOL; i++) {
WT_ERR(__wt_buf_init(session,
&log->slot_pool[i].slot_buf, log->slot_buf_size));
F_SET(&log->slot_pool[i], WT_SLOT_INIT_FLAGS);
}
WT_STAT_CONN_SET(session,
log_buffer_size, log->slot_buf_size * WT_SLOT_POOL);
}
/*
* Set up the available slot from the pool the first time.
*/
slot = &log->slot_pool[0];
/*
* We cannot initialize the release LSN in the activate function
* because that function can be called after a log file switch.
* The release LSN is usually the same as the slot_start_lsn except
* around a log file switch.
*/
slot->slot_release_lsn = log->alloc_lsn;
__wt_log_slot_activate(session, slot);
log->active_slot = slot;
log->pool_index = 0;
if (0) {
err: while (--i >= 0)
__wt_buf_free(session, &log->slot_pool[i].slot_buf);
}
return (ret);
}