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/*
Copyright (c) 2012 Red Hat, Inc. <http://www.redhat.com>
This file is part of GlusterFS.
This file is licensed to you under your choice of the GNU Lesser
General Public License, version 3 or any later version (LGPLv3 or
later), or the GNU General Public License, version 2 (GPLv2), in all
cases as published by the Free Software Foundation.
*/
#include <unistd.h>
#include <string.h>
#include <stdlib.h>
#include <stdio.h>
#include <inttypes.h>
#include <limits.h>
#include "xlator.h"
#include "glusterfs.h"
#include "glfs-internal.h"
#include "glfs-mem-types.h"
#include "gfapi-messages.h"
int
graph_setup (struct glfs *fs, glusterfs_graph_t *graph)
{
xlator_t *new_subvol = NULL;
xlator_t *old_subvol = NULL;
inode_table_t *itable = NULL;
int ret = -1;
new_subvol = graph->top;
/* This is called in a bottom-up context, it should specifically
NOT be glfs_lock()
*/
pthread_mutex_lock (&fs->mutex);
{
if (new_subvol->switched ||
new_subvol == fs->active_subvol ||
new_subvol == fs->next_subvol) {
/* Spurious CHILD_UP event on old graph */
ret = 0;
goto unlock;
}
if (!new_subvol->itable) {
itable = inode_table_new (131072, new_subvol);
if (!itable) {
errno = ENOMEM;
ret = -1;
goto unlock;
}
new_subvol->itable = itable;
}
old_subvol = fs->next_subvol;
fs->next_subvol = new_subvol;
fs->next_subvol->winds++; /* first ref */
ret = 0;
}
unlock:
pthread_mutex_unlock (&fs->mutex);
if (old_subvol)
/* wasn't picked up so far, skip */
glfs_subvol_done (fs, old_subvol);
return ret;
}
int
notify (xlator_t *this, int event, void *data, ...)
{
glusterfs_graph_t *graph = NULL;
struct glfs *fs = NULL;
graph = data;
fs = this->private;
switch (event) {
case GF_EVENT_GRAPH_NEW:
gf_msg (this->name, GF_LOG_INFO, 0, API_MSG_NEW_GRAPH,
"New graph %s (%d) coming up",
uuid_utoa ((unsigned char *)graph->graph_uuid),
graph->id);
break;
case GF_EVENT_CHILD_UP:
pthread_mutex_lock (&fs->mutex);
{
graph->used = 1;
}
pthread_mutex_unlock (&fs->mutex);
graph_setup (fs, graph);
glfs_init_done (fs, 0);
break;
case GF_EVENT_CHILD_DOWN:
pthread_mutex_lock (&fs->mutex);
{
graph->used = 0;
pthread_cond_broadcast (&fs->child_down_cond);
}
pthread_mutex_unlock (&fs->mutex);
graph_setup (fs, graph);
glfs_init_done (fs, 1);
break;
case GF_EVENT_CHILD_CONNECTING:
break;
case GF_EVENT_UPCALL:
glfs_process_upcall_event (fs, data);
break;
default:
gf_msg_debug (this->name, 0, "got notify event %d", event);
break;
}
return 0;
}
int
mem_acct_init (xlator_t *this)
{
int ret = -1;
if (!this)
return ret;
ret = xlator_mem_acct_init (this, glfs_mt_end + 1);
if (ret) {
gf_msg (this->name, GF_LOG_ERROR, ENOMEM,
API_MSG_MEM_ACCT_INIT_FAILED, "Failed to initialise "
"memory accounting");
return ret;
}
return 0;
}
int
init (xlator_t *this)
{
return 0;
}
void
fini (xlator_t *this)
{
}
/* place-holder fops */
int
glfs_forget (xlator_t *this, inode_t *inode)
{
return 0;
}
int
glfs_release (xlator_t *this, fd_t *fd)
{
return 0;
}
int
glfs_releasedir (xlator_t *this, fd_t *fd)
{
return 0;
}
struct xlator_dumpops dumpops;
struct xlator_fops fops;
struct xlator_cbks cbks = {
.forget = glfs_forget,
.release = glfs_release,
.releasedir = glfs_releasedir
};
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