svn commit: samba r21879 - in branches/SAMBA_3_0/source/smbd: .
vlendec at samba.org
vlendec at samba.org
Mon Mar 19 21:52:27 GMT 2007
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();
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