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/*
Copyright (c) 2013 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.
*/
#ifndef _CONFIG_H
#define _CONFIG_H
#include "config.h"
#endif
#include "xlator.h"
#include "defaults.h"
enum gf_pdht_mem_types_ {
gf_pdht_mt_coord_t = gf_common_mt_end + 1,
gf_pdht_mt_end
};
typedef struct {
pthread_mutex_t lock;
uint16_t refs;
int32_t op_ret;
int32_t op_errno;
dict_t *xdata;
} pdht_coord_t;
static char PROTECT_KEY[] = "trusted.glusterfs.protect";
void
pdht_unref_and_unlock (call_frame_t *frame, xlator_t *this,
pdht_coord_t *coord)
{
gf_boolean_t should_unwind;
should_unwind = (--(coord->refs) == 0);
pthread_mutex_unlock(&coord->lock);
if (should_unwind) {
STACK_UNWIND_STRICT (setxattr, frame,
coord->op_ret, coord->op_errno,
coord->xdata);
if (coord->xdata) {
dict_unref(coord->xdata);
}
GF_FREE(coord);
}
}
int32_t
pdht_recurse_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
int32_t op_ret, int32_t op_errno, dict_t *xdata)
{
pdht_coord_t *coord = cookie;
pthread_mutex_lock(&coord->lock);
if (op_ret) {
coord->op_ret = op_ret;
coord->op_errno = op_errno;
}
if (xdata) {
if (coord->xdata) {
dict_unref(coord->xdata);
}
coord->xdata = dict_ref(xdata);
}
pdht_unref_and_unlock(frame,this,coord);
return 0;
}
void
pdht_recurse (call_frame_t *frame, xlator_t *this, loc_t *loc, dict_t *dict,
int32_t flags, dict_t *xdata, xlator_t *xl, pdht_coord_t *coord)
{
xlator_list_t *iter;
if (!strcmp(xl->type,"features/prot_client")) {
pthread_mutex_lock(&coord->lock);
++(coord->refs);
pthread_mutex_unlock(&coord->lock);
STACK_WIND_COOKIE (frame, pdht_recurse_cbk, coord, xl,
xl->fops->setxattr, loc, dict, flags, xdata);
}
else for (iter = xl->children; iter; iter = iter->next) {
pdht_recurse (frame, this, loc, dict, flags, xdata,
iter->xlator, coord);
}
}
int32_t
pdht_setxattr (call_frame_t *frame, xlator_t *this, loc_t *loc, dict_t *dict,
int32_t flags, dict_t *xdata)
{
pdht_coord_t *coord;
if (!dict_get(dict,PROTECT_KEY)) {
goto simple_wind;
}
if (dict->count > 1) {
gf_log (this->name, GF_LOG_WARNING,
"attempted to mix %s with other keys", PROTECT_KEY);
goto simple_wind;
}
coord = GF_CALLOC(1,sizeof(*coord),gf_pdht_mt_coord_t);
if (!coord) {
gf_log (this->name, GF_LOG_WARNING, "allocation failed");
goto simple_wind;
}
pthread_mutex_init(&coord->lock,NULL);
coord->refs = 1;
coord->op_ret = 0;
coord->xdata = NULL;
pdht_recurse(frame,this,loc,dict,flags,xdata,this,coord);
pthread_mutex_lock(&coord->lock);
pdht_unref_and_unlock(frame,this,coord);
return 0;
simple_wind:
STACK_WIND_TAIL (frame,
FIRST_CHILD(this), FIRST_CHILD(this)->fops->setxattr,
loc, dict, flags, xdata);
return 0;
}
int32_t
init (xlator_t *this)
{
if (!this->children || this->children->next) {
gf_log (this->name, GF_LOG_ERROR,
"translator not configured with exactly one child");
return -1;
}
if (!this->parents) {
gf_log (this->name, GF_LOG_WARNING,
"dangling volume. check volfile ");
}
return 0;
}
void
fini (xlator_t *this)
{
return;
}
struct xlator_fops fops = {
.setxattr = pdht_setxattr,
};
struct xlator_cbks cbks = {
};
struct volume_options options[] = {
{ .key = {NULL} },
};
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