Centos7.3 安装编译nbd模块

未安装nbd模块

[zhaojq@localhost ~]$ modprobe nbdmodprobe: FATAL: Module nbd not found.

查看linux版本

[zhaojq@localhost ~]$ cat /etc/redhat-release CentOS Linux release 7.3.1611 (Core)[zhaojq@localhost ~]$ uname -r3.10.0-514.26.2.el7.x86_64

安装

[root@localhost tmp]# yum install kernel-devel kernel-headers

注意： wget的地址需要根据自身的系统版本设定

[root@localhost tmp]# cd /tmp/[root@localhost tmp]# wget http://vault.centos.org/7.3.1611/os/Source/SPackages/kernel-3.10.0-514.el7.src.rpm

在/root/rpmbuild/SOURCES下生成linux-3.10.0-514.el7.tar.xz

[root@localhost SOURCES]# rpm -ihv kernel-3.10.0-123.el7.src.rpm[root@localhost SOURCES]# cd ~/rpmbuild/SOURCES[root@localhost SOURCES]# tar Jxvf linux-3.10.0-123.el7.tar.xz -C /usr/src/kernels/[root@localhost SOURCES]# cd /usr/src/kernels/

/usr/src/kernels/ 路径下出现 3.10.0-514.26.2.el7.x86_64 和linux-3.10.0-514.el7两个文件夹

[root@localhost kernels]# mv $(uname -r) $(uname -r)-old[root@localhost kernels]# mv linux-3.10.0-123.el7 $(uname -r)[root@localhost kernels]# cd $(uname -r)

[root@localhost 3.10.0-514.26.2.el7.x86_64]# make mrproper[root@localhost 3.10.0-514.26.2.el7.x86_64]# cp ../$(uname -r)-old/Module.symvers ./[root@localhost 3.10.0-514.26.2.el7.x86_64]# cp /boot/config-$(uname -r) ./.config[root@localhost 3.10.0-514.26.2.el7.x86_64]# make oldconfig[root@localhost 3.10.0-514.26.2.el7.x86_64]# make prepare[root@localhost 3.10.0-514.26.2.el7.x86_64]# make scripts[root@localhost 3.10.0-514.26.2.el7.x86_64]# make CONFIG_BLK_DEV_NBD=m M=drivers/block[root@localhost 3.10.0-514.26.2.el7.x86_64]# cp drivers/block/nbd.ko /lib/modules/$(uname -r)/kernel/drivers/block/[root@localhost 3.10.0-514.26.2.el7.x86_64]# depmod -a

错误处理

make scripts

• 错误：

Makefile:901: "Cannot use CONFIG_STACK_VALIDATION, please install libelf-dev or elfutils-libelf-devel"

• 解决办法：

yum install elfutils-libelf-devel

make CONFIG_BLK_DEV_NBD=m M=drivers/block

• 错误：

make[1]: *** 没有规则可以创建“drivers/block/floppy.o”需要的目标“tools/objtool/objtool”。 停止。

• 解决办法：

首先查看make scripts时是否出错，解决后，从make prepare命令开始重新执行[root@localhost 3.10.0-514.26.2.el7.x86_64]# make prepare                     scripts/kconfig/conf --silentoldconfig Kconfigmake[1]: 对“all”无需做任何事。  ke[1]: 对“relocs”无需做任何事。▽ CHK     include/generated/uapi/linux/version.h  CHK     include/generated/utsrelease.hmake[1]: “arch/x86/purgatory/kexec-purgatory.c”是最新的。  CALL    scripts/checksyscalls.sh  DESCEND  objtool  CC       /usr/src/kernels/3.10.0-514.26.2.el7.x86_64/tools/objtool/fixdep.o  LD       /usr/src/kernels/3.10.0-514.26.2.el7.x86_64/tools/objtool/fixdep-in.o  LINK     /usr/src/kernels/3.10.0-514.26.2.el7.x86_64/tools/objtool/fixdep  CC       /usr/src/kernels/3.10.0-514.26.2.el7.x86_64/tools/objtool/exec-cmd.o  CC       /usr/src/kernels/3.10.0-514.26.2.el7.x86_64/tools/objtool/help.o  CC       /usr/src/kernels/3.10.0-514.26.2.el7.x86_64/tools/objtool/pager.o  CC       /usr/src/kernels/3.10.0-514.26.2.el7.x86_64/tools/objtool/parse-options.o  CC       /usr/src/kernels/3.10.0-514.26.2.el7.x86_64/tools/objtool/run-command.o  CC       /usr/src/kernels/3.10.0-514.26.2.el7.x86_64/tools/objtool/sigchain.o  CC       /usr/src/kernels/3.10.0-514.26.2.el7.x86_64/tools/objtool/subcmd-config.o  LD       /usr/src/kernels/3.10.0-514.26.2.el7.x86_64/tools/objtool/libsubcmd-in.o  AR       /usr/src/kernels/3.10.0-514.26.2.el7.x86_64/tools/objtool/libsubcmd.a  GEN      /usr/src/kernels/3.10.0-514.26.2.el7.x86_64/tools/objtool/arch/x86/insn/inat-tables.c  CC       /usr/src/kernels/3.10.0-514.26.2.el7.x86_64/tools/objtool/arch/x86/decode.o  LD       /usr/src/kernels/3.10.0-514.26.2.el7.x86_64/tools/objtool/arch/x86/objtool-in.o  CC       /usr/src/kernels/3.10.0-514.26.2.el7.x86_64/tools/objtool/builtin-check.o  CC       /usr/src/kernels/3.10.0-514.26.2.el7.x86_64/tools/objtool/elf.o  CC       /usr/src/kernels/3.10.0-514.26.2.el7.x86_64/tools/objtool/special.o  CC       /usr/src/kernels/3.10.0-514.26.2.el7.x86_64/tools/objtool/objtool.o  CC       /usr/src/kernels/3.10.0-514.26.2.el7.x86_64/tools/objtool/libstring.o  LD       /usr/src/kernels/3.10.0-514.26.2.el7.x86_64/tools/objtool/objtool-in.o  LINK     /usr/src/kernels/3.10.0-514.26.2.el7.x86_64/tools/objtool/objtool

make CONFIG_BLK_DEV_NBD=m M=drivers/block

• 错误：

drivers/block/nbd.c: 在函数‘__nbd_ioctl’中:drivers/block/nbd.c:619:19: 错误：‘REQ_TYPE_SPECIAL’未声明(在此函数内第一次使用)   sreq.cmd_type = REQ_TYPE_SPECIAL;                   ^drivers/block/nbd.c:619:19: 附注：每个未声明的标识符在其出现的函数内只报告一次make[1]: *** [drivers/block/nbd.o] 错误 1make: *** [_module_drivers/block] 错误 2

• 解决办法：
  bug已提交： https://bugs.centos.org/view.php?id=12248

1、 REQ_TYPE_SPECIAL变量是在/usr/src/kernels/3.10.0-514.26.2.el7.x86_64/include/linux/blkdev.h文件中定义，由代码可知 REQ_TYPE_SPECIAL = 7：

/* * request command types */enum rq_cmd_type_bits {    REQ_TYPE_FS             = 1,    /* fs request */    REQ_TYPE_BLOCK_PC,              /* scsi command */    REQ_TYPE_SENSE,                 /* sense request */    REQ_TYPE_PM_SUSPEND,            /* suspend request */    REQ_TYPE_PM_RESUME,             /* resume request */    REQ_TYPE_PM_SHUTDOWN,           /* shutdown request */#ifdef __GENKSYMS__    REQ_TYPE_SPECIAL,               /* driver defined type */#else    REQ_TYPE_DRV_PRIV,              /* driver defined type */#endif    /*     * for ATA/ATAPI devices. this really doesn't belong here, ide should     * use REQ_TYPE_DRV_PRIV and use rq->cmd[0] with the range of driver     * private REQ_LB opcodes to differentiate what type of request this is     */    REQ_TYPE_ATA_TASKFILE,    REQ_TYPE_ATA_PC,};

2、修改drivers/block/nbd.c，将sreq.cmd_type直接定义为7

//sreq.cmd_type = REQ_TYPE_SPECIAL;sreq.cmd_type = 7;

3、重新执行 make CONFIG_BLK_DEV_NBD=m M=drivers/block

运行

[zhaojq@localhost ~]$ modinfo nbdfilename:       /lib/modules/3.10.0-514.26.2.el7.x86_64/kernel/drivers/block/nbd.kolicense:        GPLdescription:    Network Block Devicerhelversion:    7.3srcversion:     EDE909A294AC5FE08E81957depends:        vermagic:       3.10.0 SMP mod_unload modversions parm:           nbds_max:number of network block devices to initialize (default: 16) (int)parm:           max_part:number of partitions per device (default: 0) (int)parm:           debugflags:flags for controlling debug output (int)