mount_lustre.c

来自「lustre 1.6.5 source code」· C语言 代码 · 共 627 行 · 第 1/2 页

        if (strncmp(real_path, "/dev/loop", 9) == 0)
                return 0;

        if ((real_path[0] != '/') && ((s2 = strpbrk(real_path, ",:")) != NULL))
                return 0;

        dev = real_path + src_len - 1;
        while (dev > real_path && (*dev != '/')) {
                if (isdigit(*dev))
                        *dev = 0;
                dev--;
        }
        snprintf(path, sizeof(path), "/sys/block%s/%s", dev,
                 MAX_HW_SECTORS_KB_PATH);
        rc = read_file(path, buf, sizeof(buf));
        if (rc == 0 && (strlen(buf) - 1) > 0) {
                snprintf(path, sizeof(path), "/sys/block%s/%s", dev,
                         MAX_SECTORS_KB_PATH);
                rc = write_file(path, buf);
                if (rc && verbose)
                        fprintf(stderr, "warning: opening %s: %s\n",
                                path, strerror(errno));
                return rc;
        }

        if (rc != ENOENT)
                return rc;

        /* The name of the device say 'X' specified in /dev/X may not
         * match any entry under /sys/block/. In that case we need to
         * match the major/minor number to find the entry under
         * sys/block corresponding to /dev/X */
        dev = real_path + src_len - 1;
        while (dev > real_path) {
                if (isdigit(*dev))
                        *dev = 0;
                dev--;
        }

        rc = stat(dev, &stat_buf);
        if (rc) {
                if (verbose)
                        fprintf(stderr, "warning: %s, device %s stat failed\n",
                                strerror(errno), dev);
                return rc;
        }

        major = major(stat_buf.st_rdev);
        minor = minor(stat_buf.st_rdev);
        rc = glob("/sys/block/*", GLOB_NOSORT, NULL, &glob_info);
        if (rc) {
                if (verbose)
                        fprintf(stderr, "warning: failed to read entries under "
                                "/sys/block\n");
                return rc;
        }

        for (i = 0; i < glob_info.gl_pathc; i++){
                snprintf(path, sizeof(path), "%s/dev", glob_info.gl_pathv[i]);

                rc = read_file(path, buf, sizeof(buf));
                if (rc)
                        continue;

                if (buf[strlen(buf) - 1] == '\n')
                        buf[strlen(buf) - 1] = '\0';

                chk_major = strtok_r(buf, ":", &savept);
                chk_minor = savept;
                if (major == atoi(chk_major) &&minor == atoi(chk_minor))
                        break;
        }

        if (i == glob_info.gl_pathc) {
                if (verbose)
                        fprintf(stderr,"warning: device %s does not match any "
                                "entry under /sys/block\n", real_path);
                rc = -EINVAL;
                goto out;
        }

        snprintf(path, sizeof(path), "%s/%s", glob_info.gl_pathv[i],
                 MAX_HW_SECTORS_KB_PATH);
        rc = read_file(path, buf, sizeof(buf));
        if (rc) {
                if (verbose)
                        fprintf(stderr, "warning: opening %s: %s\n",
                                path, strerror(errno));
                goto out;
        }

        if (strlen(buf) - 1 > 0) {
                snprintf(path, sizeof(path), "%s/%s",
                         glob_info.gl_pathv[i], MAX_SECTORS_KB_PATH);
                rc = write_file(path, buf);
                if (rc && verbose)
                        fprintf(stderr, "warning: writing to %s: %s\n",
                                path, strerror(errno));
        }

out:
        globfree(&glob_info);
        return rc;
}

int main(int argc, char *const argv[])
{
        char default_options[] = "";
        char *usource, *source, *target, *ptr;
        char *options, *optcopy, *orig_options = default_options;
        int i, nargs = 3, opt, rc, flags, optlen;
        static struct option long_opt[] = {
                {"fake", 0, 0, 'f'},
                {"force", 0, 0, 1},
                {"help", 0, 0, 'h'},
                {"nomtab", 0, 0, 'n'},
                {"options", 1, 0, 'o'},
                {"verbose", 0, 0, 'v'},
                {0, 0, 0, 0}
        };

        progname = strrchr(argv[0], '/');
        progname = progname ? progname + 1 : argv[0];

        while ((opt = getopt_long(argc, argv, "fhno:v",
                                  long_opt, NULL)) != EOF){
                switch (opt) {
                case 1:
                        ++force;
                        printf("force: %d\n", force);
                        nargs++;
                        break;
                case 'f':
                        ++fake;
                        printf("fake: %d\n", fake);
                        nargs++;
                        break;
                case 'h':
                        usage(stdout);
                        break;
                case 'n':
                        ++nomtab;
                        printf("nomtab: %d\n", nomtab);
                        nargs++;
                        break;
                case 'o':
                        orig_options = optarg;
                        nargs++;
                        break;
                case 'v':
                        ++verbose;
                        nargs++;
                        break;
                default:
                        fprintf(stderr, "%s: unknown option '%c'\n",
                                progname, opt);
                        usage(stderr);
                        break;
                }
        }

        if (optind + 2 > argc) {
                fprintf(stderr, "%s: too few arguments\n", progname);
                usage(stderr);
        }

        usource = argv[optind];
        source = convert_hostnames(usource);
        target = argv[optind + 1];
        ptr = target + strlen(target) - 1;
        while ((ptr > target) && (*ptr == '/')) {
                *ptr = 0;
                ptr--;
        }

        if (!usource || !source) {
                usage(stderr);
        }

        if (verbose) {
                for (i = 0; i < argc; i++)
                        printf("arg[%d] = %s\n", i, argv[i]);
                printf("source = %s (%s), target = %s\n", usource, source, target);
                printf("options = %s\n", orig_options);
        }

        options = malloc(strlen(orig_options) + 1);
        strcpy(options, orig_options);
        rc = parse_options(options, &flags);
        if (rc) {
                fprintf(stderr, "%s: can't parse options: %s\n",
                        progname, options);
                return(EINVAL);
        }

        if (!force) {
                rc = check_mtab_entry(usource, target, "lustre");
                if (rc && !(flags & MS_REMOUNT)) {
                        fprintf(stderr, "%s: according to %s %s is "
                                "already mounted on %s\n",
                                progname, MOUNTED, usource, target);
                        return(EEXIST);
                }
                if (!rc && (flags & MS_REMOUNT)) {
                        fprintf(stderr, "%s: according to %s %s is "
                                "not already mounted on %s\n",
                                progname, MOUNTED, usource, target);
                        return(ENOENT);
                }
        }
        if (flags & MS_REMOUNT)
                nomtab++;

        rc = access(target, F_OK);
        if (rc) {
                rc = errno;
                fprintf(stderr, "%s: %s inaccessible: %s\n", progname, target,
                        strerror(errno));
                return rc;
        }

        /* In Linux 2.4, the target device doesn't get passed to any of our
           functions.  So we'll stick it on the end of the options. */
        optlen = strlen(options) + strlen(",device=") + strlen(source) + 1;
        optcopy = malloc(optlen);
        strcpy(optcopy, options);
        if (*optcopy)
                strcat(optcopy, ",");
        strcat(optcopy, "device=");
        strcat(optcopy, source);

        if (verbose)
                printf("mounting device %s at %s, flags=%#x options=%s\n",
                       source, target, flags, optcopy);

        if (set_tunables(source, strlen(source)) && verbose)
                fprintf(stderr, "%s: unable to set tunables for %s"
                                " (may cause reduced IO performance)",
                                argv[0], source);

        if (!fake)
                /* flags and target get to lustre_get_sb, but not
                   lustre_fill_super.  Lustre ignores the flags, but mount
                   does not. */
                rc = mount(source, target, "lustre", flags, (void *)optcopy);

        if (rc) {
                char *cli;

                rc = errno;

                cli = strrchr(usource, ':');
                if (cli && (strlen(cli) > 2))
                        cli += 2;
                else
                        cli = NULL;

                fprintf(stderr, "%s: mount %s at %s failed: %s\n", progname,
                        usource, target, strerror(errno));
                if (errno == ENODEV)
                        fprintf(stderr, "Are the lustre modules loaded?\n"
                                "Check /etc/modprobe.conf and /proc/filesystems"
                                "\nNote 'alias lustre llite' should be removed"
                                " from modprobe.conf\n");
                if (errno == ENOTBLK)
                        fprintf(stderr, "Do you need -o loop?\n");
                if (errno == ENOMEDIUM)
                        fprintf(stderr,
                                "This filesystem needs at least 1 OST\n");
                if (errno == ENOENT) {
                        fprintf(stderr, "Is the MGS specification correct?\n");
                        fprintf(stderr, "Is the filesystem name correct?\n");
                        fprintf(stderr, "If upgrading, is the copied client log"
                                " valid? (see upgrade docs)\n");
                }
                if (errno == EALREADY)
                        fprintf(stderr, "The target service is already running."
                                " (%s)\n", usource);
                if (errno == ENXIO)
                        fprintf(stderr, "The target service failed to start "
                                "(bad config log?) (%s).  "
                                "See /var/log/messages.\n", usource);
                if (errno == EIO)
                        fprintf(stderr, "Is the MGS running?\n");
                if (errno == EADDRINUSE)
                        fprintf(stderr, "The target service's index is already "
                                "in use. (%s)\n", usource);
                if (errno == EINVAL) {
                        fprintf(stderr, "This may have multiple causes.\n");
                        if (cli)
                                fprintf(stderr, "Is '%s' the correct filesystem"
                                        " name?\n", cli);
                        fprintf(stderr, "Are the mount options correct?\n");
                        fprintf(stderr, "Check the syslog for more info.\n");
                }

                /* May as well try to clean up loop devs */
                if (strncmp(usource, "/dev/loop", 9) == 0) {
                        char cmd[256];
                        sprintf(cmd, "/sbin/losetup -d %s", usource);
                        system(cmd);
                }

        } else if (!nomtab) {
                rc = update_mtab_entry(usource, target, "lustre", orig_options,
                                       0,0,0);
        }

        free(optcopy);
        free(source);
        return rc;
}