Author: vlendec Date: 2007-03-19 21:52:27 +0000 (Mon, 19 Mar 2007) New Revision: 21879
WebSVN: http://websvn.samba.org/cgi-bin/viewcvs.cgi?view=rev&root=samba&rev=21879 Log: Move process_blocking_lock_queue to a timed event. The idea is that we have blocking.c:brl_timeout as a timed event that is present whenever we do have a blocking lock pending. It fires brl_timeout_fn() which calls process_blocking_lock_queue(). Whenever we make changes to blocking_lock_queue, we trigger a recalc_brl_timeout() which sets a new brl_timout event if necessary. This makes the call to blocking_locks_timeout_ms() in setup_select_timeout() unnecessary, this is implicitly done in event_add_to_select_args() from the timed events. Volker Modified: branches/SAMBA_3_0/source/smbd/blocking.c branches/SAMBA_3_0/source/smbd/process.c Changeset: Modified: branches/SAMBA_3_0/source/smbd/blocking.c =================================================================== --- branches/SAMBA_3_0/source/smbd/blocking.c 2007-03-19 21:04:56 UTC (rev 21878) +++ branches/SAMBA_3_0/source/smbd/blocking.c 2007-03-19 21:52:27 UTC (rev 21879) @@ -51,6 +51,9 @@ /* dlink list we move cancelled lock records onto. */ static blocking_lock_record *blocking_lock_cancelled_queue; +/* The event that makes us process our blocking lock queue */ +static struct timed_event *brl_timeout; + /**************************************************************************** Destructor for the above structure. ****************************************************************************/ @@ -73,8 +76,65 @@ static void received_unlock_msg(int msg_type, struct process_id src, void *buf, size_t len, void *private_data); +static void process_blocking_lock_queue(void); +static void brl_timeout_fn(struct event_context *event_ctx, + struct timed_event *te, + const struct timeval *now, + void *private_data) +{ + SMB_ASSERT(brl_timeout == te); + TALLOC_FREE(brl_timeout); + + change_to_root_user(); /* TODO: Possibly run all timed events as + * root */ + + process_blocking_lock_queue(); +} + /**************************************************************************** + After a change to blocking_lock_queue, recalculate the timed_event for the + next processing. +****************************************************************************/ + +static BOOL recalc_brl_timeout(void) +{ + blocking_lock_record *brl; + struct timeval next_timeout; + + TALLOC_FREE(brl_timeout); + + next_timeout = timeval_zero(); + + for (brl = blocking_lock_queue; brl; brl = brl->next) { + if (timeval_is_zero(&brl->expire_time)) { + continue; + } + + if (timeval_is_zero(&next_timeout)) { + next_timeout = brl->expire_time; + } + else { + next_timeout = timeval_min(&next_timeout, + &brl->expire_time); + } + } + + if (timeval_is_zero(&next_timeout)) { + return True; + } + + if (!(brl_timeout = event_add_timed(smbd_event_context(), NULL, + next_timeout, "brl_timeout", + brl_timeout_fn, NULL))) { + return False; + } + + return True; +} + + +/**************************************************************************** Function to push a blocking lock request onto the lock queue. ****************************************************************************/ @@ -152,6 +212,7 @@ } DLIST_ADD_END(blocking_lock_queue, blr, blocking_lock_record *); + recalc_brl_timeout(); /* Ensure we'll receive messages when this is unlocked. */ if (!set_lock_msg) { @@ -591,57 +652,14 @@ } /**************************************************************************** - Return the number of milliseconds to the next blocking locks timeout, or default_timeout -*****************************************************************************/ - -unsigned int blocking_locks_timeout_ms(unsigned int default_timeout_ms) -{ - unsigned int timeout_ms = default_timeout_ms; - struct timeval tv_curr; - SMB_BIG_INT min_tv_dif_us = 0x7FFFFFFF; /* A large +ve number. */ - blocking_lock_record *blr = blocking_lock_queue; - - /* note that we avoid the GetTimeOfDay() syscall if there are no blocking locks */ - if (!blr) { - return timeout_ms; - } - - tv_curr = timeval_current(); - - for (; blr; blr = blr->next) { - SMB_BIG_INT tv_dif_us; - - if (timeval_is_zero(&blr->expire_time)) { - continue; /* Never timeout. */ - } - - tv_dif_us = usec_time_diff(&blr->expire_time, &tv_curr); - min_tv_dif_us = MIN(min_tv_dif_us, tv_dif_us); - } - - if (min_tv_dif_us < 0) { - min_tv_dif_us = 0; - } - - timeout_ms = (unsigned int)(min_tv_dif_us / (SMB_BIG_INT)1000); - - if (timeout_ms < 1) { - timeout_ms = 1; - } - - DEBUG(10,("blocking_locks_timeout_ms: returning %u\n", timeout_ms)); - - return timeout_ms; -} - -/**************************************************************************** Process the blocking lock queue. Note that this is only called as root. *****************************************************************************/ -void process_blocking_lock_queue(void) +static void process_blocking_lock_queue(void) { struct timeval tv_curr = timeval_current(); blocking_lock_record *blr, *next = NULL; + BOOL recalc_timeout = False; /* * Go through the queue and see if we can get any of the locks. @@ -693,6 +711,7 @@ blocking_lock_reply_error(blr,NT_STATUS_FILE_LOCK_CONFLICT); DLIST_REMOVE(blocking_lock_queue, blr); free_blocking_lock_record(blr); + recalc_timeout = True; continue; } @@ -718,6 +737,7 @@ blocking_lock_reply_error(blr,NT_STATUS_ACCESS_DENIED); DLIST_REMOVE(blocking_lock_queue, blr); free_blocking_lock_record(blr); + recalc_timeout = True; continue; } @@ -742,6 +762,7 @@ blocking_lock_reply_error(blr,NT_STATUS_ACCESS_DENIED); DLIST_REMOVE(blocking_lock_queue, blr); free_blocking_lock_record(blr); + recalc_timeout = True; change_to_root_user(); continue; } @@ -767,9 +788,14 @@ DLIST_REMOVE(blocking_lock_queue, blr); free_blocking_lock_record(blr); + recalc_timeout = True; } change_to_root_user(); } + + if (recalc_timeout) { + recalc_brl_timeout(); + } } /**************************************************************************** Modified: branches/SAMBA_3_0/source/smbd/process.c =================================================================== --- branches/SAMBA_3_0/source/smbd/process.c 2007-03-19 21:04:56 UTC (rev 21878) +++ branches/SAMBA_3_0/source/smbd/process.c 2007-03-19 21:52:27 UTC (rev 21879) @@ -1259,7 +1259,7 @@ { int select_timeout; - select_timeout = blocking_locks_timeout_ms(SMBD_SELECT_TIMEOUT*1000); + select_timeout = SMBD_SELECT_TIMEOUT*1000; if (print_notify_messages_pending()) { select_timeout = MIN(select_timeout, 1000); @@ -1402,12 +1402,6 @@ secrets_lock_trust_account_password(lp_workgroup(), False); } - /* - * Check to see if we have any blocking locks - * outstanding on the queue. - */ - process_blocking_lock_queue(); - /* update printer queue caches if necessary */ update_monitored_printq_cache();
