通过socket的sendfile向pvfs的挂载client端写文件

(1) node15,node16为data server，node14为client端，在node14上安装了pvfs的内核模块，启动了pvfs2-client、pvfs2-client-core，将tcp://node15:3334/pvfs2-fs挂载到/mnt/pvfs2

(2) server.c (以node14为socket的server端，接收文件，并写入/mnt/pvfs2/中)

[root@node14 socket]# cat server.c#include<stdio.h>#include<stdlib.h>#include<string.h>#include<unistd.h>#include<sys/types.h>#include<sys/socket.h>#include<netinet/in.h>#include<arpa/inet.h>#include<sys/stat.h>#include<fcntl.h>#include<time.h>#include<errno.h>#define oops(msg) { perror(msg); exit(errno); }int main(){        int sd = socket(PF_INET, SOCK_STREAM, 0);        if(sd == -1) oops("socket");        struct sockaddr_in address;        bzero((void *)&address, sizeof(address));        address.sin_family = AF_INET;        address.sin_addr.s_addr = inet_addr("192.168.100.123");        address.sin_port =  8888;        int bind_return =  bind(sd, (struct sockaddr *)&address, sizeof(address));        if(bind_return == -1) oops("bind");        int listen_return = listen(sd, 1);        if(listen_return == -1) oops("listen");        while(1){                int client_fd = accept(sd, NULL, NULL);                if(client_fd == -1) oops("accept");                time_t current_time = time(NULL);                char fileName[50];                sprintf(fileName, "/mnt/pvfs2/%x", current_time);                int fd = open(fileName, O_WRONLY|O_CREAT, S_IRUSR|S_IWUSR);                if(fd == -1) oops("open");                char buff[1024];                ssize_t length;                while((length = recv(client_fd, buff, sizeof(buff), 0)) > 0){                        write(fd, buff, length);                }                close(fd);        }        return EXIT_SUCCESS;}

(3) client.c  (在任何一台linux机器上，作为socket的client端，向node14发文件)

[root@node15 socket]# cat client.c#include<stdio.h>#include<stdlib.h>#include<string.h>#include<unistd.h>#include<stdio.h>#include<stdlib.h>#include<string.h>#include<unistd.h>#include<sys/types.h>#include<sys/socket.h>#include<sys/sendfile.h>#include<netinet/in.h>#include<arpa/inet.h>#include<sys/stat.h>#include<fcntl.h>#include<errno.h>#define oops(msg) { perror(msg); exit(errno); }int main(int argc, char *argv[]){        if(argc != 2)oops("which file not specified?");        int sd = socket(PF_INET, SOCK_STREAM, 0);        if(sd == -1) oops("socket");        struct sockaddr_in address;        bzero(&address, sizeof(address));        address.sin_family = AF_INET;        address.sin_addr.s_addr = inet_addr("192.168.100.123");        address.sin_port =  8888;        int connect_ret = connect(sd, (struct sockaddr*)&address, sizeof(address));        if(connect_ret == -1) oops("connect");        int fd = open(argv[1], O_RDONLY);        off_t offset = 0;        struct stat fileStatus;        int fstat_ret = fstat(fd, &fileStatus);        if(fstat_ret == -1)oops("fstat");        ssize_t length = sendfile(sd, fd, &offset, fileStatus.st_size);        if(length == -1)                {oops("sendfile");}        else                fprintf(stdout, "%ld characters have been send to server.", length);        close(fd);        close(sd);        return EXIT_SUCCESS;}

(4) 结果显示：

大文件被分块写入到node15、node16的/pvfs2-storage-space/中。