X-Git-Url: https://repo.jachan.dev/qemu.git/blobdiff_plain/e8f2d2722eb84a809697e82c762d39c8c13f22f6..2212092e11db4c92416f989db9000737daaf9d37:/qemu-nbd.c diff --git a/qemu-nbd.c b/qemu-nbd.c index 6554f0ab65..c734f627b4 100644 --- a/qemu-nbd.c +++ b/qemu-nbd.c @@ -27,12 +27,14 @@ #include "qemu/error-report.h" #include "qemu/config-file.h" #include "qemu/bswap.h" +#include "qemu/log.h" #include "block/snapshot.h" #include "qapi/util.h" #include "qapi/qmp/qstring.h" #include "qom/object_interfaces.h" #include "io/channel-socket.h" #include "crypto/init.h" +#include "trace/control.h" #include #include @@ -46,6 +48,7 @@ #define QEMU_NBD_OPT_OBJECT 260 #define QEMU_NBD_OPT_TLSCREDS 261 #define QEMU_NBD_OPT_IMAGE_OPTS 262 +#define QEMU_NBD_OPT_FORK 263 #define MBR_SIZE 512 @@ -80,6 +83,7 @@ static void usage(const char *name) " -t, --persistent don't exit on the last connection\n" " -v, --verbose display extra debugging information\n" " -x, --export-name=NAME expose export by name\n" +" -D, --description=TEXT with -x, also export a human-readable description\n" "\n" "Exposing part of the image:\n" " -o, --offset=OFFSET offset into the image\n" @@ -88,6 +92,10 @@ static void usage(const char *name) "General purpose options:\n" " --object type,id=ID,... define an object such as 'secret' for providing\n" " passwords and/or encryption keys\n" +" -T, --trace [[enable=]][,events=][,file=]\n" +" specify tracing options\n" +" --fork fork off the server process and exit the parent\n" +" once the server is running\n" #ifdef __linux__ "Kernel NBD client support:\n" " -c, --connect=DEV connect FILE to the local NBD device DEV\n" @@ -154,8 +162,8 @@ static void read_partition(uint8_t *p, struct partition_record *r) r->end_cylinder = p[7] | ((p[6] << 2) & 0x300); r->end_sector = p[6] & 0x3f; - r->start_sector_abs = le32_to_cpup((uint32_t *)(p + 8)); - r->nb_sectors_abs = le32_to_cpup((uint32_t *)(p + 12)); + r->start_sector_abs = ldl_le_p(p + 8); + r->nb_sectors_abs = ldl_le_p(p + 12); } static int find_partition(BlockBackend *blk, int partition, @@ -247,7 +255,7 @@ static void *nbd_client_thread(void *arg) { char *device = arg; off_t size; - uint32_t nbdflags; + uint16_t nbdflags; QIOChannelSocket *sioc; int fd; int ret; @@ -461,7 +469,7 @@ int main(int argc, char **argv) BlockBackend *blk; BlockDriverState *bs; off_t dev_offset = 0; - uint32_t nbdflags = 0; + uint16_t nbdflags = 0; bool disconnect = false; const char *bindto = "0.0.0.0"; const char *port = NULL; @@ -470,7 +478,7 @@ int main(int argc, char **argv) off_t fd_size; QemuOpts *sn_opts = NULL; const char *sn_id_or_name = NULL; - const char *sopt = "hVb:o:p:rsnP:c:dvk:e:f:tl:x:"; + const char *sopt = "hVb:o:p:rsnP:c:dvk:e:f:tl:x:T:D:"; struct option lopt[] = { { "help", no_argument, NULL, 'h' }, { "version", no_argument, NULL, 'V' }, @@ -496,8 +504,11 @@ int main(int argc, char **argv) { "verbose", no_argument, NULL, 'v' }, { "object", required_argument, NULL, QEMU_NBD_OPT_OBJECT }, { "export-name", required_argument, NULL, 'x' }, + { "description", required_argument, NULL, 'D' }, { "tls-creds", required_argument, NULL, QEMU_NBD_OPT_TLSCREDS }, { "image-opts", no_argument, NULL, QEMU_NBD_OPT_IMAGE_OPTS }, + { "trace", required_argument, NULL, 'T' }, + { "fork", no_argument, NULL, QEMU_NBD_OPT_FORK }, { NULL, 0, NULL, 0 } }; int ch; @@ -515,9 +526,13 @@ int main(int argc, char **argv) BlockdevDetectZeroesOptions detect_zeroes = BLOCKDEV_DETECT_ZEROES_OPTIONS_OFF; QDict *options = NULL; const char *export_name = NULL; + const char *export_description = NULL; const char *tlscredsid = NULL; bool imageOpts = false; bool writethrough = true; + char *trace_file = NULL; + bool fork_process = false; + int old_stderr = -1; /* The client thread uses SIGTERM to interrupt the server. A signal * handler ensures that "qemu-nbd -v -c" exits with a nice status code. @@ -527,10 +542,12 @@ int main(int argc, char **argv) sa_sigterm.sa_handler = termsig_handler; sigaction(SIGTERM, &sa_sigterm, NULL); + module_call_init(MODULE_INIT_TRACE); qcrypto_init(&error_fatal); module_call_init(MODULE_INIT_QOM); qemu_add_opts(&qemu_object_opts); + qemu_add_opts(&qemu_trace_opts); qemu_init_exec_dir(argv[0]); while ((ch = getopt_long(argc, argv, sopt, lopt, &opt_ind)) != -1) { @@ -675,6 +692,9 @@ int main(int argc, char **argv) case 'x': export_name = optarg; break; + case 'D': + export_description = optarg; + break; case 'v': verbose = 1; break; @@ -703,6 +723,13 @@ int main(int argc, char **argv) case QEMU_NBD_OPT_IMAGE_OPTS: imageOpts = true; break; + case 'T': + g_free(trace_file); + trace_file = trace_opt_parse(optarg); + break; + case QEMU_NBD_OPT_FORK: + fork_process = true; + break; } } @@ -718,6 +745,12 @@ int main(int argc, char **argv) exit(EXIT_FAILURE); } + if (!trace_init_backends()) { + exit(1); + } + trace_init_file(trace_file); + qemu_set_log(LOG_TRACE); + if (tlscredsid) { if (sockpath) { error_report("TLS is only supported with IPv4/IPv6"); @@ -756,7 +789,7 @@ int main(int argc, char **argv) return 0; } - if (device && !verbose) { + if ((device && !verbose) || fork_process) { int stderr_fd[2]; pid_t pid; int ret; @@ -779,6 +812,7 @@ int main(int argc, char **argv) ret = qemu_daemon(1, 0); /* Temporarily redirect stderr to the parent's pipe... */ + old_stderr = dup(STDERR_FILENO); dup2(stderr_fd[1], STDERR_FILENO); if (ret < 0) { error_report("Failed to daemonize: %s", strerror(errno)); @@ -884,6 +918,14 @@ int main(int argc, char **argv) exit(EXIT_FAILURE); } + if (dev_offset >= fd_size) { + error_report("Offset (%lld) has to be smaller than the image size " + "(%lld)", + (long long int)dev_offset, (long long int)fd_size); + exit(EXIT_FAILURE); + } + fd_size -= dev_offset; + if (partition != -1) { ret = find_partition(blk, partition, &dev_offset, &fd_size); if (ret < 0) { @@ -893,15 +935,19 @@ int main(int argc, char **argv) } } - exp = nbd_export_new(blk, dev_offset, fd_size, nbdflags, nbd_export_closed, - &local_err); + exp = nbd_export_new(bs, dev_offset, fd_size, nbdflags, nbd_export_closed, + writethrough, NULL, &local_err); if (!exp) { error_report_err(local_err); exit(EXIT_FAILURE); } if (export_name) { nbd_export_set_name(exp, export_name); + nbd_export_set_description(exp, export_description); newproto = true; + } else if (export_description) { + error_report("Export description requires an export name"); + exit(EXIT_FAILURE); } server_ioc = qio_channel_socket_new(); @@ -934,6 +980,11 @@ int main(int argc, char **argv) exit(EXIT_FAILURE); } + if (fork_process) { + dup2(old_stderr, STDERR_FILENO); + close(old_stderr); + } + state = RUNNING; do { main_loop_wait(false);