/* * Command line utility to exercise the QEMU I/O path. * * Copyright (C) 2009 Red Hat, Inc. * Copyright (c) 2003-2005 Silicon Graphics, Inc. * * This work is licensed under the terms of the GNU GPL, version 2 or later. * See the COPYING file in the top-level directory. */ #include "qemu/osdep.h" #include <getopt.h> #include <libgen.h> #ifndef _WIN32 #include <termios.h> #endif #include "qemu/help-texts.h" #include "qapi/error.h" #include "qemu-io.h" #include "qemu/error-report.h" #include "qemu/main-loop.h" #include "qemu/module.h" #include "qemu/option.h" #include "qemu/config-file.h" #include "qemu/readline.h" #include "qemu/log.h" #include "qemu/sockets.h" #include "qapi/qmp/qstring.h" #include "qapi/qmp/qdict.h" #include "qom/object_interfaces.h" #include "sysemu/block-backend.h" #include "block/block_int.h" #include "trace/control.h" #include "crypto/init.h" #include "qemu-version.h" #define CMD_NOFILE_OK 0x01 static BlockBackend *qemuio_blk; static bool quit_qemu_io; /* qemu-io commands passed using -c */ static int ncmdline; static char **cmdline; static bool imageOpts; static ReadLineState *readline_state; static int ttyEOF; static int get_eof_char(void) { #ifdef _WIN32 return 0x4; /* Ctrl-D */ #else struct termios tty; if (tcgetattr(STDIN_FILENO, &tty) != 0) { if (errno == ENOTTY) { return 0x0; /* just expect read() == 0 */ } else { return 0x4; /* Ctrl-D */ } } return tty.c_cc[VEOF]; #endif } static int close_f(BlockBackend *blk, int argc, char **argv) { blk_unref(qemuio_blk); qemuio_blk = NULL; return 0; } static const cmdinfo_t close_cmd = { .name = "close", .altname = "c", .cfunc = close_f, .oneline = "close the current open file", }; static int openfile(char *name, int flags, bool writethrough, bool force_share, QDict *opts) { Error *local_err = NULL; if (qemuio_blk) { error_report("file open already, try 'help close'"); qobject_unref(opts); return 1; } if (force_share) { if (!opts) { opts = qdict_new(); } if (qdict_haskey(opts, BDRV_OPT_FORCE_SHARE) && strcmp(qdict_get_str(opts, BDRV_OPT_FORCE_SHARE), "on")) { error_report("-U conflicts with image options"); qobject_unref(opts); return 1; } qdict_put_str(opts, BDRV_OPT_FORCE_SHARE, "on"); } qemuio_blk = blk_new_open(name, NULL, opts, flags, &local_err); if (!qemuio_blk) { error_reportf_err(local_err, "can't open%s%s: ", name ? " device " : "", name ?: ""); return 1; } blk_set_enable_write_cache(qemuio_blk, !writethrough); return 0; } static void open_help(void) { printf( "\n" " opens a new file in the requested mode\n" "\n" " Example:\n" " 'open -n -o driver=raw /tmp/data' - opens raw data file read-write, uncached\n" "\n" " Opens a file for subsequent use by all of the other qemu-io commands.\n" " -r, -- open file read-only\n" " -s, -- use snapshot file\n" " -C, -- use copy-on-read\n" " -n, -- disable host cache, short for -t none\n" " -U, -- force shared permissions\n" " -k, -- use kernel AIO implementation (Linux only, prefer use of -i)\n" " -i, -- use AIO mode (threads, native or io_uring)\n" " -t, -- use the given cache mode for the image\n" " -d, -- use the given discard mode for the image\n" " -o, -- options to be given to the block driver" "\n"); } static int open_f(BlockBackend *blk, int argc, char **argv); static const cmdinfo_t open_cmd = { .name = "open", .altname = "o", .cfunc = open_f, .argmin = 1, .argmax = -1, .flags = CMD_NOFILE_OK, .args = "[-rsCnkU] [-t cache] [-d discard] [-o options] [path]", .oneline = "open the file specified by path", .help = open_help, }; static QemuOptsList empty_opts = { .name = "drive", .merge_lists = true, .head = QTAILQ_HEAD_INITIALIZER(empty_opts.head), .desc = { /* no elements => accept any params */ { /* end of list */ } }, }; static int open_f(BlockBackend *blk, int argc, char **argv) { int flags = BDRV_O_UNMAP; int readonly = 0; bool writethrough = true; int c; int ret; QemuOpts *qopts; QDict *opts; bool force_share = false; while ((c = getopt(argc, argv, "snCro:ki:t:d:U")) != -1) { switch (c) { case 's': flags |= BDRV_O_SNAPSHOT; break; case 'n': flags |= BDRV_O_NOCACHE; writethrough = false; break; case 'C': flags |= BDRV_O_COPY_ON_READ; break; case 'r': readonly = 1; break; case 'k': flags |= BDRV_O_NATIVE_AIO; break; case 't': if (bdrv_parse_cache_mode(optarg, &flags, &writethrough) < 0) { error_report("Invalid cache option: %s", optarg); qemu_opts_reset(&empty_opts); return -EINVAL; } break; case 'd': if (bdrv_parse_discard_flags(optarg, &flags) < 0) { error_report("Invalid discard option: %s", optarg); qemu_opts_reset(&empty_opts); return -EINVAL; } break; case 'i': if (bdrv_parse_aio(optarg, &flags) < 0) { error_report("Invalid aio option: %s", optarg); qemu_opts_reset(&empty_opts); return -EINVAL; } break; case 'o': if (imageOpts) { printf("--image-opts and 'open -o' are mutually exclusive\n"); qemu_opts_reset(&empty_opts); return -EINVAL; } if (!qemu_opts_parse_noisily(&empty_opts, optarg, false)) { qemu_opts_reset(&empty_opts); return -EINVAL; } break; case 'U': force_share = true; break; default: qemu_opts_reset(&empty_opts); qemuio_command_usage(&open_cmd); return -EINVAL; } } if (!readonly) { flags |= BDRV_O_RDWR; } if (imageOpts && (optind == argc - 1)) { if (!qemu_opts_parse_noisily(&empty_opts, argv[optind], false)) { qemu_opts_reset(&empty_opts); return -EINVAL; } optind++; } qopts = qemu_opts_find(&empty_opts, NULL); opts = qopts ? qemu_opts_to_qdict(qopts, NULL) : NULL; qemu_opts_reset(&empty_opts); if (optind == argc - 1) { ret = openfile(argv[optind], flags, writethrough, force_share, opts); } else if (optind == argc) { ret = openfile(NULL, flags, writethrough, force_share, opts); } else { qobject_unref(opts); qemuio_command_usage(&open_cmd); return -EINVAL; } if (ret) { return -EINVAL; } return 0; } static int quit_f(BlockBackend *blk, int argc, char **argv) { quit_qemu_io = true; return 0; } static const cmdinfo_t quit_cmd = { .name = "quit", .altname = "q", .cfunc = quit_f, .argmin = -1, .argmax = -1, .flags = CMD_FLAG_GLOBAL, .oneline = "exit the program", }; static void usage(const char *name) { printf( "Usage: %s [OPTIONS]... [-c STRING]... [file]\n" "QEMU Disk exerciser\n" "\n" " --object OBJECTDEF define an object such as 'secret' for\n" " passwords and/or encryption keys\n" " --image-opts treat file as option string\n" " -c, --cmd STRING execute command with its arguments\n" " from the given string\n" " -f, --format FMT specifies the block driver to use\n" " -r, --read-only export read-only\n" " -s, --snapshot use snapshot file\n" " -n, --nocache disable host cache, short for -t none\n" " -C, --copy-on-read enable copy-on-read\n" " -m, --misalign misalign allocations for O_DIRECT\n" " -k, --native-aio use kernel AIO implementation\n" " (Linux only, prefer use of -i)\n" " -i, --aio=MODE use AIO mode (threads, native or io_uring)\n" " -t, --cache=MODE use the given cache mode for the image\n" " -d, --discard=MODE use the given discard mode for the image\n" " -T, --trace [[enable=]<pattern>][,events=<file>][,file=<file>]\n" " specify tracing options\n" " see qemu-img(1) man page for full description\n" " -U, --force-share force shared permissions\n" " -h, --help display this help and exit\n" " -V, --version output version information and exit\n" "\n" "See '%s -c help' for information on available commands.\n" "\n" QEMU_HELP_BOTTOM "\n", name, name); } static char *get_prompt(void) { static char prompt[FILENAME_MAX + 2 /*"> "*/ + 1 /*"\0"*/ ]; if (!prompt[0]) { snprintf(prompt, sizeof(prompt), "%s> ", g_get_prgname()); } return prompt; } static void G_GNUC_PRINTF(2, 3) readline_printf_func(void *opaque, const char *fmt, ...) { va_list ap; va_start(ap, fmt); vprintf(fmt, ap); va_end(ap); } static void readline_flush_func(void *opaque) { fflush(stdout); } static void readline_func(void *opaque, const char *str, void *readline_opaque) { char **line = readline_opaque; *line = g_strdup(str); } static void completion_match(const char *cmd, void *opaque) { readline_add_completion(readline_state, cmd); } static void readline_completion_func(void *opaque, const char *str) { readline_set_completion_index(readline_state, strlen(str)); qemuio_complete_command(str, completion_match, NULL); } static char *fetchline_readline(void) { char *line = NULL; readline_start(readline_state, get_prompt(), 0, readline_func, &line); while (!line) { int ch = getchar(); if (ttyEOF != 0x0 && ch == ttyEOF) { printf("\n"); break; } readline_handle_byte(readline_state, ch); } return line; } #define MAXREADLINESZ 1024 static char *fetchline_fgets(void) { char *p, *line = g_malloc(MAXREADLINESZ); if (!fgets(line, MAXREADLINESZ, stdin)) { g_free(line); return NULL; } p = line + strlen(line); if (p != line && p[-1] == '\n') { p[-1] = '\0'; } return line; } static char *fetchline(void) { if (readline_state) { return fetchline_readline(); } else { return fetchline_fgets(); } } static void prep_fetchline(void *opaque) { int *fetchable = opaque; qemu_set_fd_handler(STDIN_FILENO, NULL, NULL, NULL); *fetchable= 1; } static int do_qemuio_command(const char *cmd) { int ret; AioContext *ctx = qemuio_blk ? blk_get_aio_context(qemuio_blk) : qemu_get_aio_context(); aio_context_acquire(ctx); ret = qemuio_command(qemuio_blk, cmd); aio_context_release(ctx); return ret; } static int command_loop(void) { int i, fetchable = 0, prompted = 0; int ret, last_error = 0; char *input; for (i = 0; !quit_qemu_io && i < ncmdline; i++) { ret = do_qemuio_command(cmdline[i]); if (ret < 0) { last_error = ret; } } if (cmdline) { g_free(cmdline); return last_error; } while (!quit_qemu_io) { if (!prompted) { printf("%s", get_prompt()); fflush(stdout); qemu_set_fd_handler(STDIN_FILENO, prep_fetchline, NULL, &fetchable); prompted = 1; } main_loop_wait(false); if (!fetchable) { continue; } input = fetchline(); if (input == NULL) { break; } ret = do_qemuio_command(input); g_free(input); if (ret < 0) { last_error = ret; } prompted = 0; fetchable = 0; } qemu_set_fd_handler(STDIN_FILENO, NULL, NULL, NULL); return last_error; } static void add_user_command(char *optarg) { cmdline = g_renew(char *, cmdline, ++ncmdline); cmdline[ncmdline-1] = optarg; } static void reenable_tty_echo(void) { qemu_set_tty_echo(STDIN_FILENO, true); } enum { OPTION_OBJECT = 256, OPTION_IMAGE_OPTS = 257, }; static QemuOptsList file_opts = { .name = "file", .implied_opt_name = "file", .head = QTAILQ_HEAD_INITIALIZER(file_opts.head), .desc = { /* no elements => accept any params */ { /* end of list */ } }, }; int main(int argc, char **argv) { int readonly = 0; const char *sopt = "hVc:d:f:rsnCmki:t:T:U"; const struct option lopt[] = { { "help", no_argument, NULL, 'h' }, { "version", no_argument, NULL, 'V' }, { "cmd", required_argument, NULL, 'c' }, { "format", required_argument, NULL, 'f' }, { "read-only", no_argument, NULL, 'r' }, { "snapshot", no_argument, NULL, 's' }, { "nocache", no_argument, NULL, 'n' }, { "copy-on-read", no_argument, NULL, 'C' }, { "misalign", no_argument, NULL, 'm' }, { "native-aio", no_argument, NULL, 'k' }, { "aio", required_argument, NULL, 'i' }, { "discard", required_argument, NULL, 'd' }, { "cache", required_argument, NULL, 't' }, { "trace", required_argument, NULL, 'T' }, { "object", required_argument, NULL, OPTION_OBJECT }, { "image-opts", no_argument, NULL, OPTION_IMAGE_OPTS }, { "force-share", no_argument, 0, 'U'}, { NULL, 0, NULL, 0 } }; int c; int opt_index = 0; int flags = BDRV_O_UNMAP; int ret; bool writethrough = true; QDict *opts = NULL; const char *format = NULL; bool force_share = false; #ifdef CONFIG_POSIX signal(SIGPIPE, SIG_IGN); #endif socket_init(); error_init(argv[0]); module_call_init(MODULE_INIT_TRACE); qemu_init_exec_dir(argv[0]); qcrypto_init(&error_fatal); module_call_init(MODULE_INIT_QOM); qemu_add_opts(&qemu_trace_opts); bdrv_init(); while ((c = getopt_long(argc, argv, sopt, lopt, &opt_index)) != -1) { switch (c) { case 's': flags |= BDRV_O_SNAPSHOT; break; case 'n': flags |= BDRV_O_NOCACHE; writethrough = false; break; case 'C': flags |= BDRV_O_COPY_ON_READ; break; case 'd': if (bdrv_parse_discard_flags(optarg, &flags) < 0) { error_report("Invalid discard option: %s", optarg); exit(1); } break; case 'f': format = optarg; break; case 'c': add_user_command(optarg); break; case 'r': readonly = 1; break; case 'm': qemuio_misalign = true; break; case 'k': flags |= BDRV_O_NATIVE_AIO; break; case 'i': if (bdrv_parse_aio(optarg, &flags) < 0) { error_report("Invalid aio option: %s", optarg); exit(1); } break; case 't': if (bdrv_parse_cache_mode(optarg, &flags, &writethrough) < 0) { error_report("Invalid cache option: %s", optarg); exit(1); } break; case 'T': trace_opt_parse(optarg); break; case 'V': printf("%s version " QEMU_FULL_VERSION "\n" QEMU_COPYRIGHT "\n", g_get_prgname()); exit(0); case 'h': usage(g_get_prgname()); exit(0); case 'U': force_share = true; break; case OPTION_OBJECT: user_creatable_process_cmdline(optarg); break; case OPTION_IMAGE_OPTS: imageOpts = true; break; default: usage(g_get_prgname()); exit(1); } } if ((argc - optind) > 1) { usage(g_get_prgname()); exit(1); } if (format && imageOpts) { error_report("--image-opts and -f are mutually exclusive"); exit(1); } qemu_init_main_loop(&error_fatal); if (!trace_init_backends()) { exit(1); } trace_init_file(); qemu_set_log(LOG_TRACE, &error_fatal); /* initialize commands */ qemuio_add_command(&quit_cmd); qemuio_add_command(&open_cmd); qemuio_add_command(&close_cmd); if (isatty(STDIN_FILENO)) { ttyEOF = get_eof_char(); readline_state = readline_init(readline_printf_func, readline_flush_func, NULL, readline_completion_func); qemu_set_tty_echo(STDIN_FILENO, false); atexit(reenable_tty_echo); } /* open the device */ if (!readonly) { flags |= BDRV_O_RDWR; } if ((argc - optind) == 1) { if (imageOpts) { QemuOpts *qopts = NULL; qopts = qemu_opts_parse_noisily(&file_opts, argv[optind], false); if (!qopts) { exit(1); } opts = qemu_opts_to_qdict(qopts, NULL); if (openfile(NULL, flags, writethrough, force_share, opts)) { exit(1); } } else { if (format) { opts = qdict_new(); qdict_put_str(opts, "driver", format); } if (openfile(argv[optind], flags, writethrough, force_share, opts)) { exit(1); } } } ret = command_loop(); /* * Make sure all outstanding requests complete before the program exits. */ bdrv_drain_all(); blk_unref(qemuio_blk); g_free(readline_state); if (ret < 0) { return 1; } else { return 0; } }