1 files changed, 0 insertions, 234 deletions
diff --git a/ctdb/server/ctdb_lockwait.c b/ctdb/server/ctdb_lockwait.c
deleted file mode 100644
index 2339dc861c..0000000000
--- a/ctdb/server/ctdb_lockwait.c
+++ /dev/null
@@ -1,234 +0,0 @@
-/* 
-   wait for a tdb chain lock
-
-   Copyright (C) Andrew Tridgell  2006
-
-   This program is free software; you can redistribute it and/or modify
-   it under the terms of the GNU General Public License as published by
-   the Free Software Foundation; either version 3 of the License, or
-   (at your option) any later version.
-   
-   This program is distributed in the hope that it will be useful,
-   but WITHOUT ANY WARRANTY; without even the implied warranty of
-   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-   GNU General Public License for more details.
-   
-   You should have received a copy of the GNU General Public License
-   along with this program; if not, see <http://www.gnu.org/licenses/>.
-*/
-
-#include "includes.h"
-#include "system/filesys.h"
-#include "system/wait.h"
-#include "db_wrap.h"
-#include "lib/tdb/include/tdb.h"
-#include "lib/util/dlinklist.h"
-#include "../include/ctdb_private.h"
-
-
-struct lockwait_handle {
-	struct lockwait_handle *next, *prev;
-	struct ctdb_context *ctdb;
-	struct ctdb_db_context *ctdb_db;
-	struct fd_event *fde;
-	int fd[2];
-	pid_t child;
-	void *private_data;
-	void (*callback)(void *);
-	TDB_DATA key;
-	struct timeval start_time;
-};
-
-/* If we managed to obtain a lock, find any overflow records which wanted the
- * same one and do all the callbacks at once. */
-static void do_overflow(struct ctdb_db_context *ctdb_db,
-			TDB_DATA key)
-{
-	struct lockwait_handle *i, *next;
-	TALLOC_CTX *tmp_ctx = talloc_new(ctdb_db);
-
-	for (i = ctdb_db->lockwait_overflow; i; i = next) {
-		/* Careful: destructor removes it from list! */
-		next = i->next;
-		if (key.dsize == i->key.dsize
-		    && memcmp(key.dptr, i->key.dptr, key.dsize) == 0) {
-			/* Callback might free them, so reparent. */
-			talloc_steal(tmp_ctx, i);
-			i->callback(i->private_data);
-		}
-	}
-
-	/* This will free them if callback didn't. */
-	talloc_free(tmp_ctx);
-
-	/* Remove one from the overflow queue if there is one. */
-	if (ctdb_db->lockwait_overflow) {
-		i = ctdb_db->lockwait_overflow;
-		ctdb_lockwait(ctdb_db, i->key, i->callback, i->private_data);
-		talloc_free(i);
-	}
-}
-
-static int lockwait_destructor(struct lockwait_handle *h)
-{
-	CTDB_DECREMENT_STAT(h->ctdb, pending_lockwait_calls);
-	ctdb_kill(h->ctdb, h->child, SIGKILL);
-	h->ctdb_db->pending_requests--;
-	DLIST_REMOVE(h->ctdb_db->lockwait_active, h);
-	return 0;
-}
-
-static void lockwait_handler(struct event_context *ev, struct fd_event *fde, 
-			     uint16_t flags, void *private_data)
-{
-	struct lockwait_handle *h = talloc_get_type(private_data, 
-						     struct lockwait_handle);
-	void (*callback)(void *) = h->callback;
-	void *p = h->private_data;
-	TDB_DATA key = h->key;
-	struct tdb_context *tdb = h->ctdb_db->ltdb->tdb;
-	TALLOC_CTX *tmp_ctx = talloc_new(ev);
-
-	key.dptr = talloc_memdup(tmp_ctx, key.dptr, key.dsize);
-	h->ctdb_db->pending_requests--;
-
-	CTDB_UPDATE_LATENCY(h->ctdb, h->ctdb_db, "lockwait", lockwait_latency, h->start_time);
-
-	/* the handle needs to go away when the context is gone - when
-	   the handle goes away this implicitly closes the pipe, which
-	   kills the child holding the lock */
-	talloc_steal(tmp_ctx, h);
-
-	if (h->ctdb->flags & CTDB_FLAG_TORTURE) {
-		if (tdb_chainlock_nonblock(tdb, key) == 0) {
-			ctdb_fatal(h->ctdb, "got chain lock while lockwait child active");
-		}
-	}
-
-	tdb_chainlock_mark(tdb, key);
-	callback(p);
-	if (h->ctdb_db->lockwait_overflow) {
-		do_overflow(h->ctdb_db, key);
-	}
-	tdb_chainlock_unmark(tdb, key);
-
-	talloc_free(tmp_ctx);
-}
-
-
-static int overflow_lockwait_destructor(struct lockwait_handle *h)
-{
-	CTDB_DECREMENT_STAT(h->ctdb, pending_lockwait_calls);
-	DLIST_REMOVE(h->ctdb_db->lockwait_overflow, h);
-	return 0;
-}
-
-/*
-  setup a non-blocking chainlock on a tdb record. If this function
-  returns NULL then it could not get the chainlock. Otherwise it
-  returns a opaque handle, and will call callback() once it has
-  managed to get the chainlock. You can cancel it by using talloc_free
-  on the returned handle.
-
-  It is the callers responsibility to unlock the chainlock once
-  acquired
- */
-struct lockwait_handle *ctdb_lockwait(struct ctdb_db_context *ctdb_db,
-				      TDB_DATA key,
-				      void (*callback)(void *private_data),
-				      void *private_data)
-{
-	struct lockwait_handle *result, *i;
-	int ret;
-	pid_t parent = getpid();
-
-	CTDB_INCREMENT_STAT(ctdb_db->ctdb, lockwait_calls);
-	CTDB_INCREMENT_STAT(ctdb_db->ctdb, pending_lockwait_calls);
-
-	if (!(result = talloc_zero(private_data, struct lockwait_handle))) {
-		CTDB_DECREMENT_STAT(ctdb_db->ctdb, pending_lockwait_calls);
-		return NULL;
-	}
-
-	result->callback = callback;
-	result->private_data = private_data;
-	result->ctdb = ctdb_db->ctdb;
-	result->ctdb_db = ctdb_db;
-	result->key = key;
-
-	/* If we already have a lockwait child for this request, then put this
-	   request on the overflow queue straight away
-	 */
-	for (i = ctdb_db->lockwait_active; i; i = i->next) {
-		if (key.dsize == i->key.dsize
-		    && memcmp(key.dptr, i->key.dptr, key.dsize) == 0) {
-			DLIST_ADD_END(ctdb_db->lockwait_overflow, result, NULL);
-			talloc_set_destructor(result, overflow_lockwait_destructor);
-			return result;
-		}
-	}
-
-	/* Don't fire off too many children at once! */
-	if (ctdb_db->pending_requests > 200) {
-		DLIST_ADD_END(ctdb_db->lockwait_overflow, result, NULL);
-		talloc_set_destructor(result, overflow_lockwait_destructor);
-		DEBUG(DEBUG_DEBUG, (__location__ " Created overflow for %s\n",
-				    ctdb_db->db_name));
-		return result;
-	}
-
-	ret = pipe(result->fd);
-
-	if (ret != 0) {
-		talloc_free(result);
-		CTDB_DECREMENT_STAT(ctdb_db->ctdb, pending_lockwait_calls);
-		return NULL;
-	}
-
-	result->child = ctdb_fork(ctdb_db->ctdb);
-
-	if (result->child == (pid_t)-1) {
-		close(result->fd[0]);
-		close(result->fd[1]);
-		talloc_free(result);
-		CTDB_DECREMENT_STAT(ctdb_db->ctdb, pending_lockwait_calls);
-		return NULL;
-	}
-
-	if (result->child == 0) {
-		char c = 0;
-		close(result->fd[0]);
-		debug_extra = talloc_asprintf(NULL, "chainlock-%s:", ctdb_db->db_name);
-		tdb_chainlock(ctdb_db->ltdb->tdb, key);
-		write(result->fd[1], &c, 1);
-		/* make sure we die when our parent dies */
-		while (ctdb_kill(ctdb_db->ctdb, parent, 0) == 0 || errno != ESRCH) {
-			sleep(5);
-		}
-		_exit(0);
-	}
-
-	close(result->fd[1]);
-	set_close_on_exec(result->fd[0]);
-
-	/* This is an active lockwait child process */
-	DLIST_ADD_END(ctdb_db->lockwait_active, result, NULL);
-
-	DEBUG(DEBUG_DEBUG, (__location__ " Created PIPE FD:%d to child lockwait process\n", result->fd[0]));
-
-	ctdb_db->pending_requests++;
-	talloc_set_destructor(result, lockwait_destructor);
-
-	result->fde = event_add_fd(ctdb_db->ctdb->ev, result, result->fd[0],
-				   EVENT_FD_READ, lockwait_handler,
-				   (void *)result);
-	if (result->fde == NULL) {
-		talloc_free(result);
-		CTDB_DECREMENT_STAT(ctdb_db->ctdb, pending_lockwait_calls);
-		return NULL;
-	}
-	tevent_fd_set_auto_close(result->fde);
-
-	result->start_time = timeval_current();
-	return result;
-}