1 files changed, 0 insertions, 399 deletions

diff --git a/src/kernel/block.c b/src/kernel/block.c
deleted file mode 100644
index 4295418..0000000
--- a/src/kernel/block.c
+++ /dev/null
@@ -1,399 +0,0 @@
-/*
- * block.c
- *
- *  Created on: Jun 26, 2019
- *      Author: fred
- */
-
-#include <net/sock.h>
-
-#include "dnbd3.h"
-#include "block.h"
-#include "clientconfig.h"
-
-#define dnbd3_sock_create(af,type,proto,sock) sock_create_kern(&init_net, (af) == HOST_IP4 ? AF_INET : AF_INET6, type, proto, sock)
-
-
-
-
-void dnbd3_blk_fail_all_requests(dnbd3_device_t *dev)
-{
-	printk(KERN_DEBUG "dnbd3: fail all requests device %i\n", dev->minor);
-}
-
-
-int dnbd3_socket_connect(dnbd3_device_t *dev, dnbd3_sock *sock)
-{
-	int result = -EIO;
-	struct request *req1 = NULL;
-	struct timeval timeout;
-	struct dnbd3_server_t *server = sock->server;
-	dnbd3_request_t dnbd3_request;
-	dnbd3_reply_t dnbd3_reply;
-	struct msghdr msg;
-	struct kvec iov[2];
-	uint16_t rid;
-	uint64_t reported_size;
-	char *name;
-	int mlen;
-	serialized_buffer_t payload_buffer;
-
-	printk(KERN_DEBUG "dnbd3: socket connect device %i\n", dev->minor);
-
-	mutex_init(&sock->lock);
-	mutex_lock(&sock->lock);
-	if (sock->pending) {
-		printk(KERN_DEBUG "dnbd3: socket still in request\n");
-		while (sock->pending)
-			schedule();
-	}
-	if (server->host.port == 0 || server->host.type == 0) {
-		printk(KERN_ERR "dnbd3: host or port not set\n");
-		goto error;
-	}
-	if (sock->sock) {
-		printk(KERN_WARNING "dnbd3: socket already connected\n");
-		goto error;
-	}
-
-	timeout.tv_sec = SOCKET_TIMEOUT_CLIENT_DATA;
-	timeout.tv_usec = 0;
-
-	req1 = kmalloc(sizeof(*req1), GFP_ATOMIC );
-	if (!req1) {
-		printk(KERN_ERR "dnbd3: kmalloc failed\n");
-		goto error;
-	}
-
-	init_msghdr(msg);
-
-	if (dnbd3_sock_create(server->host.type, SOCK_STREAM, IPPROTO_TCP, &sock->sock) < 0) {
-		printk(KERN_ERR "dnbd3: could not create socket\n");
-		goto error;
-	}
-
-	kernel_setsockopt(sock->sock, SOL_SOCKET, SO_SNDTIMEO, (char *)&timeout, sizeof(timeout));
-	kernel_setsockopt(sock->sock, SOL_SOCKET, SO_RCVTIMEO, (char *)&timeout, sizeof(timeout));
-	sock->sock->sk->sk_allocation = GFP_NOIO;
-	if (server->host.type == HOST_IP4) {
-		struct sockaddr_in sin;
-		memset(&sin, 0, sizeof(sin));
-		sin.sin_family = AF_INET;
-		memcpy(&(sin.sin_addr), server->host.addr, 4);
-		sin.sin_port = server->host.port;
-		if (kernel_connect(sock->sock, (struct sockaddr *)&sin, sizeof(sin), 0) != 0) {
-			printk(KERN_ERR "dnbd3: connection to host failed (ipv4)\n");
-			goto error;
-		}
-	} else {
-		struct sockaddr_in6 sin;
-		memset(&sin, 0, sizeof(sin));
-		sin.sin6_family = AF_INET6;
-		memcpy(&(sin.sin6_addr), server->host.addr, 16);
-		sin.sin6_port = server->host.port;
-		if (kernel_connect(sock->sock, (struct sockaddr *)&sin, sizeof(sin), 0) != 0){
-			printk(KERN_ERR "dnbd3: connection to host failed (ipv6)\n");
-			goto error;
-		}
-	}
-	// Request filesize
-	dnbd3_request.magic = dnbd3_packet_magic;
-	dnbd3_request.cmd = CMD_SELECT_IMAGE;
-	iov[0].iov_base = &dnbd3_request;
-	iov[0].iov_len = sizeof(dnbd3_request);
-	serializer_reset_write(&payload_buffer);
-	serializer_put_uint16(&payload_buffer, PROTOCOL_VERSION);
-	serializer_put_string(&payload_buffer, dev->imgname);
-	serializer_put_uint16(&payload_buffer, dev->rid);
-	serializer_put_uint8(&payload_buffer, 0); // is_server = false
-	iov[1].iov_base = &payload_buffer;
-	dnbd3_request.size = iov[1].iov_len = serializer_get_written_length(&payload_buffer);
-	fixup_request(dnbd3_request);
-	mlen = sizeof(dnbd3_request) + iov[1].iov_len;
-	if (kernel_sendmsg(sock->sock, &msg, iov, 2, mlen) != mlen) {
-		printk(KERN_ERR "dnbd3: could not send CMD_SIZE_REQUEST\n");
-		goto error;
-	}
-	// receive reply header
-	iov[0].iov_base = &dnbd3_reply;
-	iov[0].iov_len = sizeof(dnbd3_reply);
-	if (kernel_recvmsg(sock->sock, &msg, iov, 1, sizeof(dnbd3_reply), msg.msg_flags) != sizeof(dnbd3_reply)) {
-		printk(KERN_ERR "dnbd3: received corrupted reply header after CMD_SIZE_REQUEST\n");
-		goto error;
-	}
-
-	// check reply header
-	fixup_reply(dnbd3_reply);
-	if (dnbd3_reply.cmd != CMD_SELECT_IMAGE ||
-			dnbd3_reply.size < 3 ||
-			dnbd3_reply.size > MAX_PAYLOAD ||
-			dnbd3_reply.magic != dnbd3_packet_magic) {
-		printk(KERN_ERR "dnbd3: received invalid reply to CMD_SIZE_REQUEST image does not exist on server\n");
-		goto error;
-	}
-
-	// receive reply payload
-	iov[0].iov_base = &payload_buffer;
-	iov[0].iov_len = dnbd3_reply.size;
-	if (kernel_recvmsg(sock->sock, &msg, iov, 1, dnbd3_reply.size, msg.msg_flags) != dnbd3_reply.size) {
-		printk(KERN_ERR "dnbd3: could not read CMD_SELECT_IMAGE payload on handshake\n");
-		goto error;
-	}
-
-	// handle/check reply payload
-	serializer_reset_read(&payload_buffer, dnbd3_reply.size);
-	server->protocol_version = serializer_get_uint16(&payload_buffer);
-	if (server->protocol_version < MIN_SUPPORTED_SERVER) {
-		printk(KERN_ERR "dnbd3: server version is lower than min supported version\n");
-		goto error;
-	}
-
-	name = serializer_get_string(&payload_buffer);
-	rid = serializer_get_uint16(&payload_buffer);
-	if (dev->rid != rid && strcmp(name, dev->imgname) != 0) {
-		printk(KERN_ERR "dnbd3: server offers image '%s', requested '%s'\n", name, dev->imgname);
-		goto error;
-	}
-
-	reported_size = serializer_get_uint64(&payload_buffer);
-	if (dev->reported_size == NULL) {
-		if (reported_size < 4096) {
-			printk(KERN_ERR "dnbd3: reported size by server is < 4096\n");
-			goto error;
-		}
-		dev->reported_size = reported_size;
-		set_capacity(dev->disk, dev->reported_size >> 9); /* 512 Byte blocks */
-	} else if (dev->reported_size != reported_size) {
-		printk(KERN_ERR "dnbd3: reported size by server is %llu but should be %llu\n", reported_size, dev->reported_size);
-	}
-
-	printk(KERN_DEBUG "dnbd3: connected to image %s, filesize %llu\n", dev->imgname, dev->reported_size);
-
-	mutex_unlock(&sock->lock);
-
-//	TODO add heartbeat
-	//	timer_setup(&dev->hb_timer, dnbd3_net_heartbeat, 0);
-	//	dev->hb_timer.expires = jiffies + HZ;
-	//	add_timer(&dev->hb_timer);
-
-	return 0;
-error:
-	if (sock->sock) {
-		sock_release(sock->sock);
-		sock->sock = NULL;
-	}
-	if (req1) {
-		kfree(req1);
-	}
-	mutex_unlock(&sock->lock);
-	return result;
-}
-
-int dnbd3_socket_disconnect(dnbd3_device_t *dev, dnbd3_sock *sock)
-{
-	printk(KERN_DEBUG "dnbd3: socket disconnect device %i\n", dev->minor);
-	mutex_lock(&sock->lock);
-
-	// clear heartbeat timer
-//	del_timer(&dev->hb_timer);
-
-
-	if (sock->sock) {
-		kernel_sock_shutdown(sock->sock, SHUT_RDWR);
-	}
-
-	// clear socket
-	if (sock->sock) {
-		sock_release(sock->sock);
-		sock->sock = NULL;
-	}
-
-	mutex_unlock(&sock->lock);
-	mutex_destroy(&sock->lock);
-	return 0;
-}
-
-int dnbd3_net_disconnect(struct dnbd3_device_t *dev) {
-	int i;
-	int result;
-	for (i = 0; i < NUMBER_CONNECTIONS; i++) {
-		if (dev->socks[i].sock) {
-			if (dnbd3_socket_disconnect(dev, &dev->socks[i])) {
-				result = -EIO;
-			}
-		}
-	}
-	return result;
-}
-
-
-static void printHost(struct dnbd3_host_t *host, char *msg)
-{
-	if (host->type == HOST_IP4) {
-		printk(KERN_INFO "dnbd3: %s %pI4:%d", msg, host->addr, host->port);
-	} else {
-		printk(KERN_INFO "dnbd3: %s [%pI6]:%d", msg, host->addr, host->port);
-	}
-}
-
-static void printServerList(struct dnbd3_device_t *dev)
-{
-	int i;
-	printHost(&dev->initial_server.host, "initial server is");
-	for (i = 0; i < NUMBER_SERVERS; i++) {
-		if (dev->alt_servers[i].host.addr[0] != 0) {
-			printHost(&dev->alt_servers[i].host, "alternative server is");
-		}
-	}
-}
-
-static int dnbd3_ioctl(struct block_device *bdev, fmode_t mode, unsigned int cmd, unsigned long arg)
-{
-	int result = -100;
-	dnbd3_device_t *dev = bdev->bd_disk->private_data;
-	char *imgname = NULL;
-	dnbd3_ioctl_t *msg = NULL;
-	int i;
-
-	printk(KERN_DEBUG "dnbd3: ioctl device %i, cmd %i, arg %lu\n", dev->minor, cmd, arg);
-	//unsigned long irqflags;
-
-//	while (dev->disconnecting) {
-//		// do nothing
-//	}
-
-	if (arg != 0) {
-		msg = kmalloc(sizeof(*msg), GFP_KERNEL);
-		if (msg == NULL) return -ENOMEM;
-		if (copy_from_user((char *)msg, (char *)arg, 2) != 0 || msg->len != sizeof(*msg)) {
-			result = -ENOEXEC;
-			goto cleanup_return;
-		}
-		if (copy_from_user((char *)msg, (char *)arg, sizeof(*msg)) != 0) {
-			result = -ENOENT;
-			goto cleanup_return;
-		}
-		if (msg->imgname != NULL && msg->imgnamelen > 0) {
-			imgname = kmalloc(msg->imgnamelen + 1, GFP_KERNEL);
-			if (imgname == NULL) {
-				result = -ENOMEM;
-				goto cleanup_return;
-			}
-			if (copy_from_user(imgname, msg->imgname, msg->imgnamelen) != 0) {
-				result = -ENOENT;
-				goto cleanup_return;
-			}
-			imgname[msg->imgnamelen] = '\0';
-
-			printk(KERN_DEBUG "dnbd3: ioctl image name of len %i is %s\n", (int)msg->imgnamelen, imgname);
-		}
-	}
-
-	switch (cmd) {
-	case IOCTL_OPEN:
-		printk(KERN_DEBUG "dnbd3: ioctl open\n");
-		if (dev->imgname != NULL) {
-			result = -EBUSY;
-		} else if (imgname == NULL) {
-			result = -EINVAL;
-		} else if (msg == NULL) {
-			result = -EINVAL;
-		} else {
-			if (sizeof(msg->host) != sizeof(dev->initial_server.host)) {
-				printk(KERN_INFO "dnbd3: odd size bug#1 triggered in ioctl\n");
-			}
-			memcpy(&dev->initial_server.host, &msg->host, sizeof(msg->host));
-			dev->initial_server.failures = 0;
-//			memcpy(&dev->initial_server, &dev->cur_server, sizeof(dev->initial_server));
-			dev->imgname = imgname;
-			dev->rid = msg->rid;
-			dev->use_server_provided_alts = msg->use_server_provided_alts;
-			// Forget all alt servers on explicit connect, set first alt server to initial server
-			memset(dev->alt_servers, 0, sizeof(dev->alt_servers[0])*NUMBER_SERVERS);
-			memcpy(dev->alt_servers, &dev->initial_server, sizeof(dev->alt_servers[0]));
-//#if LINUX_VERSION_CODE >= KERNEL_VERSION(4, 11, 0)
-//			if (blk_queue->backing_dev_info != NULL) {
-//				blk_queue->backing_dev_info->ra_pages = (msg->read_ahead_kb * 1024) / PAGE_SIZE;
-//			}
-//#else
-//			blk_queue->backing_dev_info.ra_pages = (msg->read_ahead_kb * 1024) / PAGE_SIZE;
-//#endif
-
-
-			dev->socks[0].server = &dev->initial_server;
-			if (dnbd3_socket_connect(dev, &dev->socks[0]) == 0) {
-				printServerList(dev);
-				result = 0;
-				imgname = NULL; // Prevent kfree at the end
-			} else {
-				printk(KERN_ERR "dnbd3: failed to connect to initial server\n");
-				result = -ENOENT;
-				dev->imgname = NULL;
-				dev->socks[0].server = NULL;
-			}
-
-		}
-		break;
-
-	case IOCTL_CLOSE:
-		printk(KERN_DEBUG "dnbd3: ioctl close\n");
-		dnbd3_blk_fail_all_requests(dev);
-		dnbd3_net_disconnect(dev);
-		dnbd3_blk_fail_all_requests(dev);
-		set_capacity(dev->disk, 0);
-		if (dev->imgname) {
-			kfree(dev->imgname);
-			dev->imgname = NULL;
-		}
-		break;
-
-	case IOCTL_SWITCH:
-		printk(KERN_DEBUG "dnbd3: ioctl switch\n");
-		result = -EINVAL;
-		break;
-
-	case IOCTL_ADD_SRV:
-	case IOCTL_REM_SRV:
-		printk(KERN_DEBUG "dnbd3: ioctl add/rem srv\n");
-		if (dev->imgname == NULL) {
-			result = -ENOENT;
-		} else if (dev->new_servers_num >= NUMBER_SERVERS) {
-			result = -EAGAIN;
-		} else if (msg == NULL) {
-			result = -EINVAL;
-		} else {
-			memcpy(&dev->new_servers[dev->new_servers_num].host, &msg->host, sizeof(msg->host));
-			dev->new_servers[dev->new_servers_num].failures = (cmd == IOCTL_ADD_SRV ? 0 : 1); // 0 = ADD, 1 = REM
-			++dev->new_servers_num;
-			result = 0;
-		}
-		break;
-
-	case BLKFLSBUF:
-		printk(KERN_DEBUG "dnbd3: ioctl blkflsbuf\n");
-		result = 0;
-		break;
-
-	default:
-		printk(KERN_DEBUG "dnbd3: ioctl unhandled cmd %d\n", cmd);
-		result = -EIO;
-		break;
-	}
-
-cleanup_return:
-	if (msg) kfree(msg);
-	if (imgname) kfree(imgname);
-	return result;
-
-}
-
-
-
-struct block_device_operations dnbd3_fops =
-{
-	.owner = THIS_MODULE,
-	.ioctl = dnbd3_ioctl,
-	.compat_ioctl =	dnbd3_ioctl,
-};
-
-