diff -r ffa851df0825 -r 2fb8b9db1c86 symbian-qemu-0.9.1-12/qemu-symbian-svp/qemu-nbd.c --- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/symbian-qemu-0.9.1-12/qemu-symbian-svp/qemu-nbd.c Fri Jul 31 15:01:17 2009 +0100 @@ -0,0 +1,478 @@ +/* + * Copyright (C) 2005 Anthony Liguori + * + * Network Block Device + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; under version 2 of the License. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA + */ + +#include +#include "block_int.h" +#include "nbd.h" + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#define SOCKET_PATH "/var/lock/qemu-nbd-%s" + +#define NBD_BUFFER_SIZE (1024*1024) + +static int verbose; + +static void usage(const char *name) +{ + printf( +"Usage: %s [OPTIONS] FILE\n" +"QEMU Disk Network Block Device Server\n" +"\n" +" -p, --port=PORT port to listen on (default `1024')\n" +" -o, --offset=OFFSET offset into the image\n" +" -b, --bind=IFACE interface to bind to (default `0.0.0.0')\n" +" -k, --socket=PATH path to the unix socket\n" +" (default '"SOCKET_PATH"')\n" +" -r, --read-only export read-only\n" +" -P, --partition=NUM only expose partition NUM\n" +" -s, --snapshot use snapshot file\n" +" -n, --nocache disable host cache\n" +" -c, --connect=DEV connect FILE to the local NBD device DEV\n" +" -d, --disconnect disconnect the specified device\n" +" -e, --shared=NUM device can be shared by NUM clients (default '1')\n" +" -t, --persistent don't exit on the last connection\n" +" -v, --verbose display extra debugging information\n" +" -h, --help display this help and exit\n" +" -V, --version output version information and exit\n" +"\n" +"Report bugs to \n" + , name, "DEVICE"); +} + +static void version(const char *name) +{ + printf( +"%s version 0.0.1\n" +"Written by Anthony Liguori.\n" +"\n" +"Copyright (C) 2006 Anthony Liguori .\n" +"This is free software; see the source for copying conditions. There is NO\n" +"warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.\n" + , name); +} + +struct partition_record +{ + uint8_t bootable; + uint8_t start_head; + uint32_t start_cylinder; + uint8_t start_sector; + uint8_t system; + uint8_t end_head; + uint8_t end_cylinder; + uint8_t end_sector; + uint32_t start_sector_abs; + uint32_t nb_sectors_abs; +}; + +static void read_partition(uint8_t *p, struct partition_record *r) +{ + r->bootable = p[0]; + r->start_head = p[1]; + r->start_cylinder = p[3] | ((p[2] << 2) & 0x0300); + r->start_sector = p[2] & 0x3f; + r->system = p[4]; + r->end_head = p[5]; + r->end_cylinder = p[7] | ((p[6] << 2) & 0x300); + r->end_sector = p[6] & 0x3f; + r->start_sector_abs = p[8] | p[9] << 8 | p[10] << 16 | p[11] << 24; + r->nb_sectors_abs = p[12] | p[13] << 8 | p[14] << 16 | p[15] << 24; +} + +static int find_partition(BlockDriverState *bs, int partition, + off_t *offset, off_t *size) +{ + struct partition_record mbr[4]; + uint8_t data[512]; + int i; + int ext_partnum = 4; + + if (bdrv_read(bs, 0, data, 1)) + errx(EINVAL, "error while reading"); + + if (data[510] != 0x55 || data[511] != 0xaa) { + errno = -EINVAL; + return -1; + } + + for (i = 0; i < 4; i++) { + read_partition(&data[446 + 16 * i], &mbr[i]); + + if (!mbr[i].nb_sectors_abs) + continue; + + if (mbr[i].system == 0xF || mbr[i].system == 0x5) { + struct partition_record ext[4]; + uint8_t data1[512]; + int j; + + if (bdrv_read(bs, mbr[i].start_sector_abs, data1, 1)) + errx(EINVAL, "error while reading"); + + for (j = 0; j < 4; j++) { + read_partition(&data1[446 + 16 * j], &ext[j]); + if (!ext[j].nb_sectors_abs) + continue; + + if ((ext_partnum + j + 1) == partition) { + *offset = (uint64_t)ext[j].start_sector_abs << 9; + *size = (uint64_t)ext[j].nb_sectors_abs << 9; + return 0; + } + } + ext_partnum += 4; + } else if ((i + 1) == partition) { + *offset = (uint64_t)mbr[i].start_sector_abs << 9; + *size = (uint64_t)mbr[i].nb_sectors_abs << 9; + return 0; + } + } + + errno = -ENOENT; + return -1; +} + +static void show_parts(const char *device) +{ + if (fork() == 0) { + int nbd; + + /* linux just needs an open() to trigger + * the partition table update + * but remember to load the module with max_part != 0 : + * modprobe nbd max_part=63 + */ + nbd = open(device, O_RDWR); + if (nbd != -1) + close(nbd); + exit(0); + } +} + +int main(int argc, char **argv) +{ + BlockDriverState *bs; + off_t dev_offset = 0; + off_t offset = 0; + bool readonly = false; + bool disconnect = false; + const char *bindto = "0.0.0.0"; + int port = 1024; + struct sockaddr_in addr; + socklen_t addr_len = sizeof(addr); + off_t fd_size; + char *device = NULL; + char *socket = NULL; + char sockpath[128]; + const char *sopt = "hVbo:p:rsnP:c:dvk:e:t"; + struct option lopt[] = { + { "help", 0, 0, 'h' }, + { "version", 0, 0, 'V' }, + { "bind", 1, 0, 'b' }, + { "port", 1, 0, 'p' }, + { "socket", 1, 0, 'k' }, + { "offset", 1, 0, 'o' }, + { "read-only", 0, 0, 'r' }, + { "partition", 1, 0, 'P' }, + { "connect", 1, 0, 'c' }, + { "disconnect", 0, 0, 'd' }, + { "snapshot", 0, 0, 's' }, + { "nocache", 0, 0, 'n' }, + { "shared", 1, 0, 'e' }, + { "persistent", 0, 0, 't' }, + { "verbose", 0, 0, 'v' }, + { NULL, 0, 0, 0 } + }; + int ch; + int opt_ind = 0; + int li; + char *end; + int flags = 0; + int partition = -1; + int ret; + int shared = 1; + uint8_t *data; + fd_set fds; + int *sharing_fds; + int fd; + int i; + int nb_fds = 0; + int max_fd; + int persistent = 0; + + while ((ch = getopt_long(argc, argv, sopt, lopt, &opt_ind)) != -1) { + switch (ch) { + case 's': + flags |= BDRV_O_SNAPSHOT; + break; + case 'n': + flags |= BDRV_O_NOCACHE; + break; + case 'b': + bindto = optarg; + break; + case 'p': + li = strtol(optarg, &end, 0); + if (*end) { + errx(EINVAL, "Invalid port `%s'", optarg); + } + if (li < 1 || li > 65535) { + errx(EINVAL, "Port out of range `%s'", optarg); + } + port = (uint16_t)li; + break; + case 'o': + dev_offset = strtoll (optarg, &end, 0); + if (*end) { + errx(EINVAL, "Invalid offset `%s'", optarg); + } + if (dev_offset < 0) { + errx(EINVAL, "Offset must be positive `%s'", optarg); + } + break; + case 'r': + readonly = true; + break; + case 'P': + partition = strtol(optarg, &end, 0); + if (*end) + errx(EINVAL, "Invalid partition `%s'", optarg); + if (partition < 1 || partition > 8) + errx(EINVAL, "Invalid partition %d", partition); + break; + case 'k': + socket = optarg; + if (socket[0] != '/') + errx(EINVAL, "socket path must be absolute\n"); + break; + case 'd': + disconnect = true; + break; + case 'c': + device = optarg; + break; + case 'e': + shared = strtol(optarg, &end, 0); + if (*end) { + errx(EINVAL, "Invalid shared device number '%s'", optarg); + } + if (shared < 1) { + errx(EINVAL, "Shared device number must be greater than 0\n"); + } + break; + case 't': + persistent = 1; + break; + case 'v': + verbose = 1; + break; + case 'V': + version(argv[0]); + exit(0); + break; + case 'h': + usage(argv[0]); + exit(0); + break; + case '?': + errx(EINVAL, "Try `%s --help' for more information.", + argv[0]); + } + } + + if ((argc - optind) != 1) { + errx(EINVAL, "Invalid number of argument.\n" + "Try `%s --help' for more information.", + argv[0]); + } + + if (disconnect) { + fd = open(argv[optind], O_RDWR); + if (fd == -1) + errx(errno, "Cannot open %s", argv[optind]); + + nbd_disconnect(fd); + + close(fd); + + printf("%s disconnected\n", argv[optind]); + + return 0; + } + + bdrv_init(); + + bs = bdrv_new("hda"); + if (bs == NULL) + return 1; + + if (bdrv_open(bs, argv[optind], flags) == -1) + return 1; + + fd_size = bs->total_sectors * 512; + + if (partition != -1 && + find_partition(bs, partition, &dev_offset, &fd_size)) + errx(errno, "Could not find partition %d", partition); + + if (device) { + pid_t pid; + int sock; + + if (!verbose) + daemon(0, 0); /* detach client and server */ + + if (socket == NULL) { + sprintf(sockpath, SOCKET_PATH, basename(device)); + socket = sockpath; + } + + pid = fork(); + if (pid < 0) + return 1; + if (pid != 0) { + off_t size; + size_t blocksize; + + ret = 0; + bdrv_close(bs); + + do { + sock = unix_socket_outgoing(socket); + if (sock == -1) { + if (errno != ENOENT && errno != ECONNREFUSED) + goto out; + sleep(1); /* wait children */ + } + } while (sock == -1); + + fd = open(device, O_RDWR); + if (fd == -1) { + ret = 1; + goto out; + } + + ret = nbd_receive_negotiate(sock, &size, &blocksize); + if (ret == -1) { + ret = 1; + goto out; + } + + ret = nbd_init(fd, sock, size, blocksize); + if (ret == -1) { + ret = 1; + goto out; + } + + printf("NBD device %s is now connected to file %s\n", + device, argv[optind]); + + /* update partition table */ + + show_parts(device); + + nbd_client(fd, sock); + close(fd); + out: + kill(pid, SIGTERM); + unlink(socket); + + return ret; + } + /* children */ + } + + sharing_fds = qemu_malloc((shared + 1) * sizeof(int)); + if (sharing_fds == NULL) + errx(ENOMEM, "Cannot allocate sharing fds"); + + if (socket) { + sharing_fds[0] = unix_socket_incoming(socket); + } else { + sharing_fds[0] = tcp_socket_incoming(bindto, port); + } + + if (sharing_fds[0] == -1) + return 1; + max_fd = sharing_fds[0]; + nb_fds++; + + data = qemu_memalign(512, NBD_BUFFER_SIZE); + if (data == NULL) + errx(ENOMEM, "Cannot allocate data buffer"); + + do { + + FD_ZERO(&fds); + for (i = 0; i < nb_fds; i++) + FD_SET(sharing_fds[i], &fds); + + ret = select(max_fd + 1, &fds, NULL, NULL, NULL); + if (ret == -1) + break; + + if (FD_ISSET(sharing_fds[0], &fds)) + ret--; + for (i = 1; i < nb_fds && ret; i++) { + if (FD_ISSET(sharing_fds[i], &fds)) { + if (nbd_trip(bs, sharing_fds[i], fd_size, dev_offset, + &offset, readonly, data, NBD_BUFFER_SIZE) != 0) { + close(sharing_fds[i]); + nb_fds--; + sharing_fds[i] = sharing_fds[nb_fds]; + i--; + } + ret--; + } + } + /* new connection ? */ + if (FD_ISSET(sharing_fds[0], &fds)) { + if (nb_fds < shared + 1) { + sharing_fds[nb_fds] = accept(sharing_fds[0], + (struct sockaddr *)&addr, + &addr_len); + if (sharing_fds[nb_fds] != -1 && + nbd_negotiate(sharing_fds[nb_fds], fd_size) != -1) { + if (sharing_fds[nb_fds] > max_fd) + max_fd = sharing_fds[nb_fds]; + nb_fds++; + } + } + } + } while (persistent || nb_fds > 1); + qemu_free(data); + + close(sharing_fds[0]); + bdrv_close(bs); + qemu_free(sharing_fds); + if (socket) + unlink(socket); + + return 0; +}