diff options
Diffstat (limited to 'src/kernel/main.c')
| -rw-r--r-- | src/kernel/main.c | 216 |
1 files changed, 0 insertions, 216 deletions
diff --git a/src/kernel/main.c b/src/kernel/main.c deleted file mode 100644 index 1802b5f..0000000 --- a/src/kernel/main.c +++ /dev/null @@ -1,216 +0,0 @@ -#include <linux/fs.h> -#include <linux/module.h> -#include <linux/blkdev.h> -#include <net/sock.h> - -// Own -#include "config.h" -#include "include/types.h" - -static int major; -static struct gendisk *disk; -static struct request_queue *dnbd3_queue; - -DEFINE_SPINLOCK( dnbd3_lock); - -static struct socket *_sock; -static struct dnbd3_request _dnbd3_request; -static struct dnbd3_reply _dnbd3_reply; - -static char* host; -static char* port; - -unsigned int inet_addr(char *str) -{ - int a, b, c, d; - char arr[4]; - sscanf(str, "%d.%d.%d.%d", &a, &b, &c, &d); - arr[0] = a; - arr[1] = b; - arr[2] = c; - arr[3] = d; - return *(unsigned int*) arr; -} - -void connect(void) -{ - if (!host || !port) - { - printk("ERROR: Host or port not set."); - return; - } - - // initialize socket - struct sockaddr_in sin; - if (sock_create_kern(AF_INET, SOCK_STREAM, IPPROTO_TCP, &_sock) < 0) - { - printk("ERROR: dnbd3 couldn't create socket.\n"); - return; - } - sin.sin_family = AF_INET; - sin.sin_addr.s_addr = inet_addr(host); - sin.sin_port = htons(simple_strtol(port, NULL, 10)); - if (kernel_connect(_sock, (struct sockaddr *) &sin, sizeof(sin), 0) < 0) - { - printk("ERROR: dnbd3 couldn't connect to given host.\n"); - return; - } - - // prepare message - struct msghdr msg; - struct kvec iov; - _sock->sk->sk_allocation = GFP_NOIO; // GFP_NOIO: blocking is possible, but no I/O will be performed. - msg.msg_name = NULL; - msg.msg_namelen = 0; - msg.msg_control = NULL; - msg.msg_controllen = 0; - msg.msg_flags = MSG_WAITALL | MSG_NOSIGNAL; // No SIGPIPE - - // send request - _dnbd3_request.cmd = CMD_GET_SIZE; - iov.iov_base = &_dnbd3_request; - iov.iov_len = sizeof(_dnbd3_request); - kernel_sendmsg(_sock, &msg, &iov, 1, sizeof(_dnbd3_request)); - - // receive replay - iov.iov_base = &_dnbd3_reply; - iov.iov_len = sizeof(_dnbd3_reply); - kernel_recvmsg(_sock, &msg, &iov, 1, sizeof(_dnbd3_reply), msg.msg_flags); - - // set filesize - printk("INFO: dnbd3 filesize: %llu\n", _dnbd3_reply.filesize); - set_capacity(disk, _dnbd3_reply.filesize >> 9); /* 512 Byte blocks */ -} - -void dnbd3_request(struct request_queue *q) -{ - if (!_sock) - return; - - struct request *req; - struct msghdr msg; - struct kvec iov; - - _sock->sk->sk_allocation = GFP_NOIO; // GFP_NOIO: blocking is possible, but no I/O will be performed. - msg.msg_name = NULL; - msg.msg_namelen = 0; - msg.msg_control = NULL; - msg.msg_controllen = 0; - msg.msg_flags = MSG_WAITALL | MSG_NOSIGNAL; // No SIGPIPE - - while ((req = blk_fetch_request(q)) != NULL) - { - if (req->cmd_type != REQ_TYPE_FS) - { - if (!__blk_end_request_cur(req, 0)) - req = blk_fetch_request(q); - continue; - } - - spin_unlock_irq(q->queue_lock); - if (rq_data_dir(req) == READ) - { - _dnbd3_request.cmd = CMD_GET_BLOCK; - _dnbd3_request.offset = blk_rq_pos(req) << 9; // *512 - _dnbd3_request.size = blk_rq_bytes(req); // blk_rq_bytes() Returns bytes left to complete in the entire request - - // send request - iov.iov_base = &_dnbd3_request; - iov.iov_len = sizeof(_dnbd3_request); - kernel_sendmsg(_sock, &msg, &iov, 1, sizeof(_dnbd3_request)); - - // receive replay - struct req_iterator iter; - struct bio_vec *bvec; - rq_for_each_segment(bvec, req, iter) - { - iov.iov_base = kmap(bvec->bv_page) + bvec->bv_offset; - iov.iov_len = bvec->bv_len; - kernel_recvmsg(_sock, &msg, &iov, 1, bvec->bv_len, msg.msg_flags); - kunmap(bvec->bv_page); - } - } - - spin_lock_irq(q->queue_lock); - __blk_end_request_all(req, 0); - } -} - -int dnbd3_ioctl(struct block_device *bdev, fmode_t mode, - unsigned int cmd, unsigned long arg) -{ - switch (cmd) - { - case IOCTL_SET_HOST: - host = (char *) arg; - break; - - case IOCTL_SET_PORT: - port = (char *) arg; - break; - - case IOCTL_CONNECT: - connect(); - break; - case BLKFLSBUF: - // TODO: if missing, hdparm tells "BLKFLSBUF failed: Operation not permitted". Figure out what this should do. - break; - - default: - return -1; - - } - return 0; -} - -struct block_device_operations dnbd3_ops = -{ .owner = THIS_MODULE, .ioctl = dnbd3_ioctl, }; - -static int __init dnbd3_init(void) -{ - // Init blkdev - if ((major = register_blkdev(0, "dnbd")) == 0) - { - printk("ERROR: dnbd3 register_blkdev failed.\n"); - return -EIO; - } - if (!(disk = alloc_disk(1))) - { - printk("ERROR: dnbd3 alloc_disk failed.\n"); - return -EIO; - } - disk->major = major; - disk->first_minor = 0; - sprintf(disk->disk_name, "dnbd0"); - set_capacity(disk, 0); - //set_disk_ro(disk, 1); - disk->fops = &dnbd3_ops; - - if ((dnbd3_queue = blk_init_queue(&dnbd3_request, &dnbd3_lock)) == NULL) - { - printk("ERROR: dnbd3 blk_init_queue failed.\n"); - return -EIO; - } - - blk_queue_logical_block_size(dnbd3_queue, DNBD3_BLOCK_SIZE); // set logical block size for the queue - disk->queue = dnbd3_queue; - - add_disk(disk); - printk("INFO: dnbd3 init successful.\n"); - return 0; -} - -static void __exit dnbd3_exit(void) -{ - if (_sock) - sock_release(_sock); - unregister_blkdev(major, "dnbd"); - del_gendisk(disk); - put_disk(disk); - blk_cleanup_queue(dnbd3_queue); - printk("INFO: dnbd3 exit.\n"); -} - -module_init( dnbd3_init); -module_exit( dnbd3_exit); -MODULE_LICENSE("GPL"); |