Gluster添加自定义简单xlator的步骤

1、状况说明：

已有的gluster集群由三台机器组成，分别为：
gfsmaster 172.29.41.205
gfsslave1  172.29.41.204
gfsslave2  172.29.41.203

用于测试gluster挂载的客户端
gfsclient     172.29.41.206
挂载目录为 /opt/gfsmount

glusterfs源码目录：/root/Gluster/gluster

2、编写自定义代码和Makefile文件

#ifndef _CONFIG_H
#define _CONFIG_H
#include "config.h"
#include "xlator.h"
#endif

#include <fnmatch.h>
#include <errno.h>
#include "glusterfs.h"
#include "xlator.h"
#include <stdarg.h>
#include "defaults.h"
#include "logging.h"

int test_lookup_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
int32_t op_ret, int32_t op_errno,
inode_t *inode, struct iatt *buf,
dict_t *xdata, struct iatt *postparent)
{
STACK_UNWIND_STRICT (lookup, frame, op_ret, op_errno, inode, buf, xdata,
postparent);
return 0;
}

static int test_lookup(call_frame_t *frame, xlator_t *this, loc_t *loc, dict_t *xdata)
{
gf_log(this->name, GF_LOG_ERROR, "in test translator lookup");
STACK_WIND (frame, test_lookup_cbk,
FIRST_CHILD(this), FIRST_CHILD(this)->fops->lookup,
loc, xdata);
return 0;
}

static int test_stat (call_frame_t *frame, xlator_t *this, loc_t *loc, dict_t *xdata)
{
gf_log(this->name, GF_LOG_ERROR, "in test translator stat");
return 0;
}

int
reconfigure (xlator_t *this, dict_t *options)
{
return 0;
}

int
init (xlator_t *this)
{
struct ios_conf    *conf = NULL;
int                 ret = -1;

gf_log (this->name, GF_LOG_ERROR, "test translator loaded");
if (!this)
return -1;

if (!this->children) {
gf_log (this->name, GF_LOG_ERROR,
"test translator requires atleast one subvolume");
return -1;
}

if (!this->parents) {
gf_log (this->name, GF_LOG_ERROR, "dangling volume. check volfile ");
}

conf = this->private;

this->private = conf;
ret = 0;
return ret;
}

void
fini (xlator_t *this)
{
struct ios_conf *conf = NULL;

if (!this)
return;

conf = this->private;

if (!conf)
return;
this->private = NULL;

GF_FREE(conf);
gf_log (this->name, GF_LOG_ERROR, "test translator unloaded");
return;
}

int
notify (xlator_t *this, int32_t event, void *data, ...)
{
default_notify (this, event, data);
return 0;
}

struct xlator_fops fops = {
.stat        = test_stat,
.lookup      = test_lookup,
};

struct xlator_cbks cbks = {
};

struct volume_options options[] = {
};

Add translator into glusterfs volume file
#Author Steven Liu
#E-mail lingjiujianke@gmail.com
#Blog: http://blog.fs-linux.org 
TARGET  = test.so
OBJECTS = test.o

GLUSTERFS_SRC   = /root/Gluster/glusterfs
GLUSTERFS_LIB   = /usr/local/lib
HOST_OS = HF_LINUX_HOST_OS

CFLAGS  = -fPIC -Wall -O0 -g \
-DHAVE_CONFIG_H -D_FILE_OFFSET_BITS=64 -D_GNU_SOURCE -D$(HOST_OS) \
-I$(GLUSTERFS_SRC) -I$(GLUSTERFS_SRC)/libglusterfs/src \
-I$(GLUSTERFS_SRC)/contrib/uuid

LDFLAGS = -shared -nostartfiles -L$(GLUSTERFS_LIB) -lglusterfs -lpthread

$(TARGET): $(OBJECTS)
$(CC) $(OBJECTS) $(LDFLAGS) -o $(TARGET)

clean:
rm -rf $(TARGET) $(OBJECTS)

3、编译出so文件 并放在所有机器的/usr/local/lib/glusterfs/xlator/debug/（具体根据不同版本路径有所不同）下面

4、修改volfile

vi /var/lib/glusterd/vols/testvol/testvol-fuse.vol

volume testvol-test
type debug/test
subvolumes testvol-md-cache
end-volume

volume testvol
type debug/io-stats
option count-fop-hits off
option latency-measurement off
subvolumes testvol-test
end-volume

5、在三台gluster服务器中重启glusterfsd进程

ps  -ef  | grep glusterfsd

kill -9 ****

6、客户端挂载测试