centos上编译nbd.ko

block]# make CONFIG_BLK_DEV_NBD=m -C /lib/modules/`uname -r`/build M=`pwd` modules

make: Entering directory `/usr/src/kernels/3.10.0-957.27.2.el7.x86_64'

  CC [M]  /root/rpmbuild/SOURCES/linux-3.10.0-957.27.2.el7/drivers/block/nbd.o

/root/rpmbuild/SOURCES/linux-3.10.0-957.27.2.el7/drivers/block/nbd.c: In function ‘__nbd_ioctl’:

/root/rpmbuild/SOURCES/linux-3.10.0-957.27.2.el7/drivers/block/nbd.c:619:19: error: ‘REQ_TYPE_SPECIAL’ undeclared (first use in this function)

   sreq.cmd_type = REQ_TYPE_SPECIAL;

                   ^

/root/rpmbuild/SOURCES/linux-3.10.0-957.27.2.el7/drivers/block/nbd.c:619:19: note: each undeclared identifier is reported only once for each function it appears in

make[1]: *** [/root/rpmbuild/SOURCES/linux-3.10.0-957.27.2.el7/drivers/block/nbd.o] Error 1

make: *** [_module_/root/rpmbuild/SOURCES/linux-3.10.0-957.27.2.el7/drivers/block] Error 2

make: Leaving directory `/usr/src/kernels/3.10.0-957.27.2.el7.x86_64'