mirror of
git://sourceware.org/git/lvm2.git
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424 lines
7.5 KiB
C
424 lines
7.5 KiB
C
/*
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* Copyright (C) 2001 Sistina Software (UK) Limited.
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*
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* This file is released under the GPL.
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*/
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#include "libdevmapper.h"
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#include <stdio.h>
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#include <stdlib.h>
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#include <stdarg.h>
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#include <string.h>
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#include <unistd.h>
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#include <fcntl.h>
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#include <sys/stat.h>
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#include <sys/types.h>
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#include <ctype.h>
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#include <errno.h>
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#include <unistd.h>
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#include <getopt.h>
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#include <linux/kdev_t.h>
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#define LINE_SIZE 1024
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#define err(msg, x...) fprintf(stderr, msg "\n", ##x)
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/*
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* We have only very simple switches ATM.
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*/
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enum {
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READ_ONLY = 0,
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MINOR_ARG,
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NUM_SWITCHES
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};
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static int _switches[NUM_SWITCHES];
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static int _values[NUM_SWITCHES];
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/*
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* Commands
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*/
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static int _parse_file(struct dm_task *dmt, const char *file)
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{
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char buffer[LINE_SIZE], *ttype, *ptr, *comment;
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FILE *fp = fopen(file, "r");
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unsigned long long start, size;
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int r = 0, n, line = 0;
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if (!fp) {
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err("Couldn't open '%s' for reading", file);
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return 0;
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}
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while (fgets(buffer, sizeof(buffer), fp)) {
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line++;
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/* trim trailing space */
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for (ptr = buffer + strlen(buffer) - 1; ptr >= buffer; ptr--)
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if (!isspace((int) *ptr))
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break;
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ptr++;
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*ptr = '\0';
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/* trim leading space */
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for (ptr = buffer; *ptr && isspace((int) *ptr); ptr++)
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;
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if (!*ptr || *ptr == '#')
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continue;
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if (sscanf(ptr, "%llu %llu %as %n",
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&start, &size, &ttype, &n) < 3) {
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err("%s:%d Invalid format", file, line);
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goto out;
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}
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ptr += n;
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if ((comment = strchr(ptr, (int) '#')))
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*comment = '\0';
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if (!dm_task_add_target(dmt, start, size, ttype, ptr))
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goto out;
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free(ttype);
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}
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r = 1;
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out:
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fclose(fp);
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return r;
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}
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static int _load(int task, const char *name, const char *file)
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{
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int r = 0;
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struct dm_task *dmt;
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if (!(dmt = dm_task_create(task)))
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return 0;
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if (!dm_task_set_name(dmt, name))
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goto out;
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if (!_parse_file(dmt, file))
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goto out;
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if (_switches[READ_ONLY] && !dm_task_set_ro(dmt))
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goto out;
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if (_switches[MINOR_ARG] && !dm_task_set_minor(dmt, _values[MINOR_ARG]))
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goto out;
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if (!dm_task_run(dmt))
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goto out;
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r = 1;
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out:
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dm_task_destroy(dmt);
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return r;
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}
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static int _create(int argc, char **argv)
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{
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return _load(DM_DEVICE_CREATE, argv[1], argv[2]);
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}
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static int _reload(int argc, char **argv)
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{
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return _load(DM_DEVICE_RELOAD, argv[1], argv[2]);
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}
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static int _rename(int argc, char **argv)
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{
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int r = 0;
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struct dm_task *dmt;
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if (!(dmt = dm_task_create(DM_DEVICE_RENAME)))
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return 0;
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if (!dm_task_set_name(dmt, argv[1]))
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goto out;
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if (!dm_task_set_newname(dmt, argv[2]))
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goto out;
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if (!dm_task_run(dmt))
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goto out;
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r = 1;
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out:
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dm_task_destroy(dmt);
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return r;
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}
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static int _version(int argc, char **argv)
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{
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int r = 0;
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struct dm_task *dmt;
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char version[80];
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if (dm_get_library_version(version, sizeof(version)))
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printf("Library version: %s\n", version);
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if (!(dmt = dm_task_create(DM_DEVICE_VERSION)))
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return 0;
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if (!dm_task_run(dmt))
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goto out;
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if (!dm_task_get_driver_version(dmt, (char *)&version,
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sizeof(version)))
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goto out;
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printf("Driver version: %s\n", version);
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r = 1;
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out:
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dm_task_destroy(dmt);
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return r;
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}
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static int _simple(int task, const char *name)
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{
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int r = 0;
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/* remove <dev_name> */
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struct dm_task *dmt;
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if (!(dmt = dm_task_create(task)))
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return 0;
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if (!dm_task_set_name(dmt, name))
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goto out;
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r = dm_task_run(dmt);
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out:
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dm_task_destroy(dmt);
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return r;
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}
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static int _remove(int argc, char **argv)
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{
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return _simple(DM_DEVICE_REMOVE, argv[1]);
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}
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static int _suspend(int argc, char **argv)
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{
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return _simple(DM_DEVICE_SUSPEND, argv[1]);
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}
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static int _resume(int argc, char **argv)
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{
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return _simple(DM_DEVICE_RESUME, argv[1]);
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}
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static int _info(int argc, char **argv)
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{
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int r = 0;
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/* remove <dev_name> */
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struct dm_task *dmt;
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struct dm_info info;
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if (!(dmt = dm_task_create(DM_DEVICE_INFO)))
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return 0;
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if (!dm_task_set_name(dmt, argv[1]))
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goto out;
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if (!dm_task_run(dmt))
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goto out;
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if (!dm_task_get_info(dmt, &info))
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goto out;
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if (!info.exists) {
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printf("Device does not exist.\n");
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r = 1;
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goto out;
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}
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printf("State: %s\n",
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info.suspended ? "SUSPENDED" : "ACTIVE");
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if (info.open_count != -1)
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printf("Open count: %d\n", info.open_count);
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printf("Major, minor: %d, %d\n", info.major, info.minor);
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if (info.target_count != -1)
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printf("Number of targets: %d\n", info.target_count);
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r = 1;
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out:
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dm_task_destroy(dmt);
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return r;
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}
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static int _deps(int argc, char **argv)
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{
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int r = 0, i;
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struct dm_deps *deps;
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/* remove <dev_name> */
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struct dm_task *dmt;
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struct dm_info info;
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if (!(dmt = dm_task_create(DM_DEVICE_DEPS)))
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return 0;
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if (!dm_task_set_name(dmt, argv[1]))
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goto out;
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if (!dm_task_run(dmt))
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goto out;
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if (!(deps = dm_task_get_deps(dmt)))
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goto out;
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if (!info.exists) {
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printf("Device does not exist.\n");
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r = 1;
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goto out;
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}
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printf("%d dependencies\t:", deps->count);
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for (i = 0; i < deps->count; i++)
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printf(" (%d, %d)",
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(int) MAJOR(deps->device[i]),
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(int) MINOR(deps->device[i]));
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printf("\n");
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r = 1;
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out:
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dm_task_destroy(dmt);
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return r;
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}
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/*
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* dispatch table
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*/
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typedef int (*command_fn)(int argc, char **argv);
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struct command {
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char *name;
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char *help;
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int num_args;
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command_fn fn;
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};
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static struct command _commands[] = {
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{"create", "<dev_name> <table_file>", 2, _create},
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{"remove", "<dev_name>", 1, _remove},
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{"suspend", "<dev_name>", 1, _suspend},
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{"resume", "<dev_name>", 1, _resume},
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{"reload", "<dev_name> <table_file>", 2, _reload},
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{"info", "<dev_name>", 1, _info},
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{"dependencies", "<dev_name>", 1, _deps},
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{"rename", "<dev_name> <new_name>", 2, _rename},
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{"version", "", 0, _version},
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{NULL, NULL, 0, NULL}
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};
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static void _usage(FILE *out)
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{
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int i;
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fprintf(out, "usage:\n");
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for (i = 0; _commands[i].name; i++)
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fprintf(out, "\t%s %s\n",
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_commands[i].name, _commands[i].help);
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return;
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}
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static struct command *_find_command(const char *name)
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{
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int i;
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for (i = 0; _commands[i].name; i++)
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if (!strcmp(_commands[i].name, name))
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return _commands + i;
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return NULL;
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}
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static int _process_switches(int *argc, char ***argv)
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{
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int index;
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char c;
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static struct option long_options[] = {
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{"read-only", 0, NULL, READ_ONLY},
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{"minor", 1, NULL, MINOR_ARG},
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{"", 0, NULL, 0}
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};
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/*
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* Zero all the index counts.
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*/
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memset(&_switches, 0, sizeof(_switches));
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memset(&_values, 0, sizeof(_values));
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while ((c = getopt_long(*argc, *argv, "m:r",
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long_options, &index)) != -1) {
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if (c == 'r' || index == READ_ONLY)
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_switches[READ_ONLY]++;
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if (c == 'm' || index == MINOR_ARG) {
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_switches[MINOR_ARG]++;
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_values[MINOR_ARG] = atoi(optarg);
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}
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}
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*argv += optind;
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*argc -= optind;
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return 1;
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}
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int main(int argc, char **argv)
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{
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struct command *c;
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if (!_process_switches(&argc, &argv)) {
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fprintf(stderr, "Couldn't process command line switches.\n");
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exit(1);
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}
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if (argc == 0) {
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_usage(stderr);
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exit(1);
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}
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if (!(c = _find_command(argv[0]))) {
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fprintf(stderr, "Unknown command\n");
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_usage(stderr);
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exit(1);
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}
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if (argc != c->num_args + 1) {
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fprintf(stderr, "Incorrect number of arguments\n");
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_usage(stderr);
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exit(1);
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}
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if (!c->fn(argc, argv)) {
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fprintf(stderr, "Command failed\n");
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exit(1);
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}
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return 0;
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}
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