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https://github.com/libguestfs/libguestfs.git
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0710326ac5
This is an extensible version of 'mkfs' which supports optional arguments. There is now no need for 'mkfs_b' since you should use 'mkfs_opts' with the optional 'blocksize' argument instead.
148 lines
4.1 KiB
C
148 lines
4.1 KiB
C
/* libguestfs - the guestfsd daemon
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* Copyright (C) 2009 Red Hat Inc.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#include <config.h>
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#include <stdio.h>
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#include <stdlib.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 <dirent.h>
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#include <sys/stat.h>
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#include "daemon.h"
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#include "actions.h"
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#define MAX_ARGS 16
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/* Takes optional arguments, consult optargs_bitmask. */
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int
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do_mkfs_opts (const char *fstype, const char *device, int blocksize)
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{
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const char *argv[MAX_ARGS];
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size_t i = 0, j;
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char blocksize_str[32];
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int r;
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char *err;
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argv[i++] = "mkfs";
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argv[i++] = "-t";
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argv[i++] = fstype;
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/* mkfs.ntfs requires the -Q argument otherwise it writes zeroes
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* to every block and does bad block detection, neither of which
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* are useful behaviour for virtual devices.
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*/
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if (STREQ (fstype, "ntfs"))
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argv[i++] = "-Q";
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/* mkfs.reiserfs produces annoying interactive prompts unless you
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* tell it to be quiet.
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*/
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if (STREQ (fstype, "reiserfs"))
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argv[i++] = "-f";
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/* Same for JFS. */
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if (STREQ (fstype, "jfs"))
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argv[i++] = "-f";
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/* For GFS, GFS2, assume a single node. */
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if (STREQ (fstype, "gfs") || STREQ (fstype, "gfs2")) {
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argv[i++] = "-p";
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argv[i++] = "lock_nolock";
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/* The man page says this is default, but it doesn't seem to be: */
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argv[i++] = "-j";
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argv[i++] = "1";
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/* Don't ask questions: */
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argv[i++] = "-O";
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}
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/* Process blocksize parameter if set. */
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if (optargs_bitmask & GUESTFS_MKFS_OPTS_BLOCKSIZE_BITMASK) {
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if (blocksize <= 0 || !is_power_of_2 (blocksize)) {
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reply_with_error ("block size must be > 0 and a power of 2");
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return -1;
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}
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if (STREQ (fstype, "vfat") ||
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STREQ (fstype, "msdos")) {
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/* For VFAT map the blocksize into a cluster size. However we
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* have to determine the block device sector size in order to do
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* this.
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*/
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int sectorsize = do_blockdev_getss (device);
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if (sectorsize == -1)
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return -1;
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int sectors_per_cluster = blocksize / sectorsize;
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if (sectors_per_cluster < 1 || sectors_per_cluster > 128) {
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reply_with_error ("unsupported cluster size for %s filesystem (requested cluster size = %d, sector size = %d, trying sectors per cluster = %d)",
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fstype, blocksize, sectorsize, sectors_per_cluster);
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return -1;
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}
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snprintf (blocksize_str, sizeof blocksize_str, "%d", sectors_per_cluster);
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argv[i++] = "-s";
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argv[i++] = blocksize_str;
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}
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else if (STREQ (fstype, "ntfs")) {
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/* For NTFS map the blocksize into a cluster size. */
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snprintf (blocksize_str, sizeof blocksize_str, "%d", blocksize);
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argv[i++] = "-c";
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argv[i++] = blocksize_str;
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}
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else {
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/* For all other filesystem types, try the -b option. */
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snprintf (blocksize_str, sizeof blocksize_str, "%d", blocksize);
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argv[i++] = "-b";
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argv[i++] = blocksize_str;
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}
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}
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argv[i++] = device;
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argv[i++] = NULL;
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if (i > MAX_ARGS)
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abort ();
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r = commandv (NULL, &err, argv);
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if (r == -1) {
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reply_with_error ("%s: %s: %s", fstype, device, err);
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free (err);
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return -1;
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}
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free (err);
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return 0;
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}
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int
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do_mkfs (const char *fstype, const char *device)
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{
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optargs_bitmask = 0;
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return do_mkfs_opts (fstype, device, 0);
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}
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int
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do_mkfs_b (const char *fstype, int blocksize, const char *device)
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{
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optargs_bitmask = GUESTFS_MKFS_OPTS_BLOCKSIZE_BITMASK;
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return do_mkfs_opts (fstype, device, blocksize);
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}
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