diff options
Diffstat (limited to 'src/qemu-io.c')
| -rw-r--r-- | src/qemu-io.c | 501 |
1 files changed, 501 insertions, 0 deletions
diff --git a/src/qemu-io.c b/src/qemu-io.c new file mode 100644 index 0000000..269f17c --- /dev/null +++ b/src/qemu-io.c @@ -0,0 +1,501 @@ +/* + * 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 <sys/time.h> +#include <sys/types.h> +#include <stdarg.h> +#include <stdio.h> +#include <getopt.h> +#include <libgen.h> + +#include "qemu-io.h" +#include "qemu/error-report.h" +#include "qemu/main-loop.h" +#include "qemu/option.h" +#include "qemu/config-file.h" +#include "qemu/readline.h" +#include "qapi/qmp/qstring.h" +#include "sysemu/block-backend.h" +#include "block/block_int.h" +#include "trace/control.h" + +#define CMD_NOFILE_OK 0x01 + +static char *progname; + +static BlockBackend *qemuio_blk; + +/* qemu-io commands passed using -c */ +static int ncmdline; +static char **cmdline; + +static ReadLineState *readline_state; + +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, QDict *opts) +{ + Error *local_err = NULL; + BlockDriverState *bs; + + if (qemuio_blk) { + fprintf(stderr, "file open already, try 'help close'\n"); + QDECREF(opts); + return 1; + } + + qemuio_blk = blk_new_open("hda", name, NULL, opts, flags, &local_err); + if (!qemuio_blk) { + fprintf(stderr, "%s: can't open%s%s: %s\n", progname, + name ? " device " : "", name ?: "", + error_get_pretty(local_err)); + error_free(local_err); + return 1; + } + + bs = blk_bs(qemuio_blk); + if (bdrv_is_encrypted(bs)) { + char password[256]; + printf("Disk image '%s' is encrypted.\n", name); + if (qemu_read_password(password, sizeof(password)) < 0) { + error_report("No password given"); + goto error; + } + if (bdrv_set_key(bs, password) < 0) { + error_report("invalid password"); + goto error; + } + } + + + return 0; + + error: + blk_unref(qemuio_blk); + qemuio_blk = NULL; + return 1; +} + +static void open_help(void) +{ + printf( +"\n" +" opens a new file in the requested mode\n" +"\n" +" Example:\n" +" 'open -Cn /tmp/data' - creates/opens data file read-write and 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" +" -n, -- disable host cache\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 = "[-Crsn] [-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 = 0; + int readonly = 0; + int c; + QemuOpts *qopts; + QDict *opts; + + while ((c = getopt(argc, argv, "snrgo:")) != -1) { + switch (c) { + case 's': + flags |= BDRV_O_SNAPSHOT; + break; + case 'n': + flags |= BDRV_O_NOCACHE | BDRV_O_CACHE_WB; + break; + case 'r': + readonly = 1; + break; + case 'o': + if (!qemu_opts_parse_noisily(&empty_opts, optarg, false)) { + qemu_opts_reset(&empty_opts); + return 0; + } + break; + default: + qemu_opts_reset(&empty_opts); + return qemuio_command_usage(&open_cmd); + } + } + + if (!readonly) { + flags |= BDRV_O_RDWR; + } + + 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) { + return openfile(argv[optind], flags, opts); + } else if (optind == argc) { + return openfile(NULL, flags, opts); + } else { + QDECREF(opts); + return qemuio_command_usage(&open_cmd); + } +} + +static int quit_f(BlockBackend *blk, int argc, char **argv) +{ + return 1; +} + +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 [-h] [-V] [-rsnm] [-f FMT] [-c STRING] ... [file]\n" +"QEMU Disk exerciser\n" +"\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\n" +" -m, --misalign misalign allocations for O_DIRECT\n" +" -k, --native-aio use kernel AIO implementation (on Linux only)\n" +" -t, --cache=MODE use the given cache mode for the image\n" +" -T, --trace FILE enable trace events listed in the given file\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", + name, name); +} + +static char *get_prompt(void) +{ + static char prompt[FILENAME_MAX + 2 /*"> "*/ + 1 /*"\0"*/ ]; + + if (!prompt[0]) { + snprintf(prompt, sizeof(prompt), "%s> ", progname); + } + + return prompt; +} + +static void GCC_FMT_ATTR(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 (ch == EOF) { + 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 void command_loop(void) +{ + int i, done = 0, fetchable = 0, prompted = 0; + char *input; + + for (i = 0; !done && i < ncmdline; i++) { + done = qemuio_command(qemuio_blk, cmdline[i]); + } + if (cmdline) { + g_free(cmdline); + return; + } + + while (!done) { + 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; + } + done = qemuio_command(qemuio_blk, input); + g_free(input); + + prompted = 0; + fetchable = 0; + } + qemu_set_fd_handler(STDIN_FILENO, NULL, NULL, NULL); +} + +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); +} + +int main(int argc, char **argv) +{ + int readonly = 0; + const char *sopt = "hVc:d:f:rsnmgkt:T:"; + const struct option lopt[] = { + { "help", 0, NULL, 'h' }, + { "version", 0, NULL, 'V' }, + { "offset", 1, NULL, 'o' }, + { "cmd", 1, NULL, 'c' }, + { "format", 1, NULL, 'f' }, + { "read-only", 0, NULL, 'r' }, + { "snapshot", 0, NULL, 's' }, + { "nocache", 0, NULL, 'n' }, + { "misalign", 0, NULL, 'm' }, + { "native-aio", 0, NULL, 'k' }, + { "discard", 1, NULL, 'd' }, + { "cache", 1, NULL, 't' }, + { "trace", 1, NULL, 'T' }, + { NULL, 0, NULL, 0 } + }; + int c; + int opt_index = 0; + int flags = BDRV_O_UNMAP; + Error *local_error = NULL; + QDict *opts = NULL; + +#ifdef CONFIG_POSIX + signal(SIGPIPE, SIG_IGN); +#endif + + progname = basename(argv[0]); + qemu_init_exec_dir(argv[0]); + + 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 | BDRV_O_CACHE_WB; + break; + case 'd': + if (bdrv_parse_discard_flags(optarg, &flags) < 0) { + error_report("Invalid discard option: %s", optarg); + exit(1); + } + break; + case 'f': + if (!opts) { + opts = qdict_new(); + } + qdict_put(opts, "driver", qstring_from_str(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 't': + if (bdrv_parse_cache_flags(optarg, &flags) < 0) { + error_report("Invalid cache option: %s", optarg); + exit(1); + } + break; + case 'T': + if (!trace_init_backends(optarg, NULL)) { + exit(1); /* error message will have been printed */ + } + break; + case 'V': + printf("%s version %s\n", progname, QEMU_VERSION); + exit(0); + case 'h': + usage(progname); + exit(0); + default: + usage(progname); + exit(1); + } + } + + if ((argc - optind) > 1) { + usage(progname); + exit(1); + } + + if (qemu_init_main_loop(&local_error)) { + error_report_err(local_error); + exit(1); + } + + /* initialize commands */ + qemuio_add_command(&quit_cmd); + qemuio_add_command(&open_cmd); + qemuio_add_command(&close_cmd); + + if (isatty(STDIN_FILENO)) { + 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) { + openfile(argv[optind], flags, opts); + } + command_loop(); + + /* + * Make sure all outstanding requests complete before the program exits. + */ + bdrv_drain_all(); + + blk_unref(qemuio_blk); + g_free(readline_state); + return 0; +} |
