222 lines
11 KiB
C
222 lines
11 KiB
C
/****************************************************************
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* *
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* Copyright 2001, 2011 Fidelity Information Services, Inc *
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* *
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* This source code contains the intellectual property *
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* of its copyright holder(s), and is made available *
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* under a license. If you do not know the terms of *
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* the license, please stop and do not read further. *
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* *
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****************************************************************/
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#include "mdef.h"
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#include "gtm_fcntl.h" /* needed for silly aix's expansion of open to open64 */
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#include "gtm_unistd.h"
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#include "gdsroot.h"
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#include "gtm_facility.h"
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#include "gdskill.h"
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#include "fileinfo.h"
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#include "gdsbt.h"
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#include "gdsblk.h"
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#include "gdsfhead.h"
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#include "filestruct.h"
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#include "gdscc.h"
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#include "jnl.h"
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#include "buddy_list.h" /* for tp.h */
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#include "hashtab_int4.h" /* needed for tp.h */
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#include "tp.h" /* for tp_region definition */
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#include "gt_timer.h" /* for TID definition */
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#include "timers.h" /* for TIM_DEFER_DBSYNC #define */
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#include "gdsbgtr.h" /* for the BG_TRACE_PRO macros */
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#include "gtmio.h" /* for the GET_LSEEK_FLAG macro */
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#include "wcs_clean_dbsync.h"
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#include "tp_grab_crit.h"
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#include "wcs_flu.h"
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#include "lockconst.h"
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#ifdef GTM_MALLOC_RENT
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# define GTM_MALLOC_NO_RENT_ONLY(X)
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#else
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# define GTM_MALLOC_NO_RENT_ONLY(X) X
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#endif
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NOPIO_ONLY(GBLREF boolean_t *lseekIoInProgress_flags;) /* needed for the LSEEK* macros in gtmio.h */
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GBLREF gd_region *gv_cur_region;
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GBLREF sgmnt_addrs *cs_addrs;
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GBLREF sgmnt_data_ptr_t cs_data;
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GBLREF volatile int4 crit_count;
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GBLREF volatile boolean_t in_mutex_deadlock_check;
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GBLREF volatile int4 db_fsync_in_prog, jnl_qio_in_prog;
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GBLREF volatile int4 fast_lock_count;
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GBLREF volatile int4 gtmMallocDepth; /* Recursion indicator */
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GBLREF boolean_t mupip_jnl_recover;
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#ifdef DEBUG
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GBLREF unsigned int t_tries;
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#endif
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/* Sync the filehdr (and epoch in the journal file if before imaging). The goal is to sync the database,
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* but if we find us in a situation where we need to block on someone else, then we defer this to the next round.
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*/
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void wcs_clean_dbsync(TID tid, int4 hd_len, sgmnt_addrs **csaptr)
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{
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boolean_t dbsync_defer_timer;
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gd_region *reg, *save_region;
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jnl_private_control *jpc;
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node_local_ptr_t cnl;
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sgmnt_addrs *csa, *check_csaddrs, *save_csaddrs;
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sgmnt_data_ptr_t csd, save_csdata;
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NOPIO_ONLY(boolean_t lseekIoInProgress_flag;)
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DEBUG_ONLY(boolean_t save_ok_to_call_wcs_recover;)
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boolean_t is_mm;
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DCL_THREADGBL_ACCESS;
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SETUP_THREADGBL_ACCESS;
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csa = *csaptr;
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assert(csa->dbsync_timer); /* to ensure no duplicate dbsync timers */
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CANCEL_DBSYNC_TIMER(csa); /* reset csa->dbsync_timer now that the dbsync timer has popped */
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assert(!csa->dbsync_timer);
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reg = csa->region;
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/* Don't know how this can happen, but if region is closed, just return in PRO. */
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if (!reg->open)
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{
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assert(FALSE);
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return;
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}
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is_mm = (dba_mm == reg->dyn.addr->acc_meth);
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save_region = gv_cur_region; /* Save for later restore. See notes about restore */
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save_csaddrs = cs_addrs;
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save_csdata = cs_data;
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/* Save to see if we are in crit anywhere */
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check_csaddrs = ((NULL == save_region || FALSE == save_region->open) ? NULL : (&FILE_INFO(save_region)->s_addrs));
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/* Note the non-usage of TP_CHANGE_REG_IF_NEEDED macros since this routine can be timer driven. */
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TP_CHANGE_REG(reg);
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csd = csa->hdr;
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cnl = csa->nl;
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jpc = csa->jnl;
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BG_TRACE_PRO_ANY(csa, n_dbsync_timers);
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assert(csa == cs_addrs);
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assert(!JNL_ALLOWED(csd) || NULL != jpc);
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/* Note that even if the active queue was emptied when this routine was called, due to
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* concurrent update activity, cnl->wcs_active_lvl can be non-zero when we reach here. We
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* defer syncing in this case to the next time the active queue becomes empty ( or when we
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* reach the next scheduled epoch_time -- in case of before-imaging) whichever is earlier.
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*
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* Note that if we are already in wcs_wtstart for this region, then invoking wcs_flu() won't
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* recurse on wcs_wtstart. In any case the interrupted wcs_wtstart invocation will take care
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* of the dbsync_timer once it is done. Therefore in this case too no need to do the dbsync.
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*/
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dbsync_defer_timer = FALSE;
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if (!cnl->wcs_active_lvl && !csa->in_wtstart)
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{ /* Similar to wcs_stale, defer expensive IO flushing if any of the following is true.
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* 1) We are in the midst of lseek/read/write IO. This could reset an lseek.
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* 2) We are aquiring/releasing crit in any region (Strictly speaking it is enough
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* to check this in the current region, but doesn't harm us much).
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* Note that the function "mutex_deadlock_check" resets crit_count to 0 temporarily even though we
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* might actually be in the midst of acquiring crit. Therefore we should not interrupt mainline code
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* if we are in the "mutex_deadlock_check" as otherwise it presents reentrancy issues.
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* 3) We have crit in the current region OR are in the middle of commit for this region (even though
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* we dont hold crit) OR are in wcs_wtstart (potentially holding write interlock and keeping another
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* process in crit waiting) OR we need to wait to obtain crit. At least one reason why we should not wait
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* to obtain crit is because the timeout mechanism for the critical section is currently (as of 2004 May)
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* driven by heartbeat on Tru64, AIX, Solaris and HPUX. The periodic heartbeat handler cannot pop as
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* it is a SIGALRM handler and cannot nest while we are already in a SIGALRM handler for the wcs_clean_dbsync.
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* Were this to happen, we could end up waiting for crit, not being able to interrupt the wait
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* with a timeout resulting in a hang until crit became available.
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* 4) We are in a "fast lock".
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* 5) We are in gtm_malloc. Don't want to recurse on malloc.
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* Other deadlock causing conditions that need to be taken care of
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* 1) We already have either the fsync_in_prog or the io_in_prog lock.
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* 2) We are currently doing a db_fsync on some region.
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*/
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dbsync_defer_timer = TRUE;
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GET_LSEEK_FLAG(FILE_INFO(reg)->fd, lseekIoInProgress_flag);
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DEBUG_ONLY(
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/* We invoke tp_grab_crit below which can potentially do cache-recoveries if csd->wc_blocked is set.
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* But wcs_recover has an assert that we never invoke it in the final retry. This is to avoid
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* restarts in the final retry. But wcs_clean_dbsync invokes tp_grab_crit only if we dont already
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* hold crit and that means we have already finished commit on this particular region (e.g. if
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* commit is complete on all regions and crit is released on all of them but before we reset t_tries
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* to 0 in t_end/tp_tend) so it is okay to invoke wcs_recover in that case. Signal that to wcs_recover
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* by setting ok_to_call_wcs_recover to TRUE. Need to save and restore the global as it could be
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* TRUE or FALSE depending on where wcs_clean_dbsync interrupted mainline code.
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*/
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assert(CDB_STAGNATE >= t_tries);
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if (CDB_STAGNATE <= t_tries)
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{
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save_ok_to_call_wcs_recover = TREF(ok_to_call_wcs_recover);
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TREF(ok_to_call_wcs_recover) = TRUE;
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}
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)
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if (!mupip_jnl_recover NOPIO_ONLY(&& (FALSE == lseekIoInProgress_flag))
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GTM_MALLOC_NO_RENT_ONLY(&& 0 == gtmMallocDepth)
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&& (0 == crit_count) && !in_mutex_deadlock_check
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&& (0 == fast_lock_count)
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&& (!jnl_qio_in_prog) && (!db_fsync_in_prog)
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&& (!jpc || !jpc->jnl_buff || (LOCK_AVAILABLE == jpc->jnl_buff->fsync_in_prog_latch.u.parts.latch_pid))
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&& ((NULL == check_csaddrs) || !T_IN_CRIT_OR_COMMIT_OR_WRITE(check_csaddrs))
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&& !T_IN_CRIT_OR_COMMIT_OR_WRITE(csa)
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&& (FALSE != tp_grab_crit(reg)))
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{ /* Note that tp_grab_crit invokes wcs_recover in case csd->wc_blocked is non-zero.
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* This means we could be doing cache recovery even though we are in interrupt code.
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* If this is found undesirable, the logic in tp_grab_crit that invokes wcs_recover has to be re-examined.
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*/
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/* Note that if we are here, we have obtained crit using tp_grab_crit. */
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assert(csa->ti->early_tn == csa->ti->curr_tn);
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/* Do not invoke wcs_flu if the database has a newer journal file than what this process had open
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* when the dbsync timer was started in wcs_wtstart. This is because mainline (non-interrupt) code
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* in jnl_write_attempt/jnl_output_sp assumes that interrupt code will not update jpc structures to
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* point to latest journal file (i.e. will not do a jnl_ensure_open) but wcs_flu might invoke just
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* that. It is ok not to do a wcs_flu since whichever process did the journal switch would have
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* written the EPOCH record in the older generation journal file. Therefore there is no need to
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* start a new dbsync timer in this case.
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*
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* If journaling and writing EPOCHs, do a wcs_flu only if there has been at least one transaction
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* since the last time someone wrote an EPOCH.
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*
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* If NOT journaling or if NOT writing EPOCHs, do a wcs_flu only if there has been at least one
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* transaction since the last time someone did a wcs_flu.
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*
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* This way wcs_flu is not redundantly invoked and it ensures that the least number of epochs
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* (only the necessary ones) are written OR the least number of db file header flushes are done.
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*
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* If MM and not writing EPOCHs, we dont need to even flush the file header since MM by default
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* does NO msyncs of the database file during normal operation but instead only at database rundown.
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* So no need to do wcs_flu in this case.
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*/
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if ((NULL != jpc) && JNL_HAS_EPOCH(jpc->jnl_buff)
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? (((NOJNL == jpc->channel) || !JNL_FILE_SWITCHED(jpc))
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&& (jpc->jnl_buff->epoch_tn < csa->ti->curr_tn))
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: !is_mm && (cnl->last_wcsflu_tn < csa->ti->curr_tn))
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{
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wcs_flu(WCSFLU_FLUSH_HDR | WCSFLU_WRITE_EPOCH | WCSFLU_SYNC_EPOCH);
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BG_TRACE_PRO_ANY(csa, n_dbsync_writes);
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/* If MM, file could have been remapped by wcs_flu above. If so, cs_data needs to be reset */
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if (is_mm && (save_csaddrs == cs_addrs) && (save_csdata != cs_data))
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save_csdata = cs_addrs->hdr;
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}
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dbsync_defer_timer = FALSE;
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assert(!csa->hold_onto_crit); /* this ensures we can safely do unconditional rel_crit */
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rel_crit(reg);
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}
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DEBUG_ONLY(
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if (CDB_STAGNATE <= t_tries)
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TREF(ok_to_call_wcs_recover) = save_ok_to_call_wcs_recover;
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)
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}
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if (dbsync_defer_timer)
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{
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assert(SIZEOF(INTPTR_T) == SIZEOF(csa));
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if (!csa->dbsync_timer)
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START_DBSYNC_TIMER(csa, TIM_DEFER_DBSYNC);
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}
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/* To restore to former glory, don't use TP_CHANGE_REG, 'coz we might mistakenly set cs_addrs and cs_data to NULL
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* if the region we are restoring to has been closed. Don't use tp_change_reg 'coz we might be ripping out the structures
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* needed in tp_change_reg in gv_rundown. */
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gv_cur_region = save_region;
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cs_addrs = save_csaddrs;
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cs_data = save_csdata;
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return;
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}
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