Define QEMU side interfaces used for chroot environment. Signed-off-by: M. Mohan Kumar <mo...@in.ibm.com> --- hw/9pfs/virtio-9p-chroot.c | 78 ++++++++++++++++++++++++++++++++++++++++++++ 1 files changed, 78 insertions(+), 0 deletions(-)
diff --git a/hw/9pfs/virtio-9p-chroot.c b/hw/9pfs/virtio-9p-chroot.c index dcde2cc..25a7fab 100644 --- a/hw/9pfs/virtio-9p-chroot.c +++ b/hw/9pfs/virtio-9p-chroot.c @@ -91,6 +91,82 @@ static void chroot_read_request(int sockfd, V9fsFileObjectRequest *request) } } +/* Receive file descriptor and error status from chroot process */ +static int v9fs_receivefd(int sockfd, int *error) +{ + struct msghdr msg = { }; + struct iovec iov; + union MsgControl msg_control; + struct cmsghdr *cmsg; + int retval, fd; + FdInfo fd_info; + + iov.iov_base = &fd_info; + iov.iov_len = sizeof(fd_info); + + memset(&msg, 0, sizeof(msg)); + msg.msg_iov = &iov; + msg.msg_iovlen = 1; + msg.msg_control = &msg_control; + msg.msg_controllen = sizeof(msg_control); + + retval = recvmsg(sockfd, &msg, 0); + if (retval < 0) { + error_report("recvmsg: %s", strerror(errno)); + exit(1); + } + + /* If error is set, ancillary data is not present */ + if (fd_info.fi_error) { + *error = fd_info.fi_error; + return -1; + } + + for (cmsg = CMSG_FIRSTHDR(&msg); cmsg; cmsg = CMSG_NXTHDR(&msg, cmsg)) { + if (cmsg->cmsg_len != CMSG_LEN(sizeof(int)) || + cmsg->cmsg_level != SOL_SOCKET || + cmsg->cmsg_type != SCM_RIGHTS) { + continue; + } + fd = *((int *)CMSG_DATA(cmsg)); + return fd; + } + + *error = EAGAIN; + return -1; +} + +/* + * V9fsFileObjectRequest is written into the socket by QEMU process. + * Then this request is read by chroot process using read_request function + */ +static void v9fs_write_request(int sockfd, V9fsFileObjectRequest *request) +{ + int retval; + + retval = qemu_write_full(sockfd, &request->data, + sizeof(request->data)); + if (retval < 0) { + error_report("socket write failed: %s", strerror(errno)); + exit(-1); + } + + retval = qemu_write_full(sockfd, request->path.path, + request->data.path_len); + if (retval < 0) { + error_report("socket write failed: %s", strerror(errno)); + exit(-1); + } + if (request->data.oldpath_len > 0) { + retval = qemu_write_full(sockfd, request->path.old_path, + request->data.oldpath_len); + if (retval < 0) { + error_report("socket write failed: %s", strerror(errno)); + exit(-1); + } + } +} + static int chroot_daemonize(int chroot_sock) { sigset_t sigset; @@ -122,6 +198,8 @@ static int chroot_daemonize(int chroot_sock) static void chroot_dummy(void) { (void)chroot_sendfd; + (void)v9fs_receivefd; + (void)v9fs_write_request; } /* -- 1.7.3.4