spaceman/info.c

/*
 * Copyright (C) 2018 Oracle.  All Rights Reserved.
 *
 * Author: Darrick J. Wong <darrick.wong@oracle.com>
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it would be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write the Free Software Foundation,
 * Inc.,  51 Franklin St, Fifth Floor, Boston, MA  02110-1301, USA.
 */
#include "libxfs.h"
#include "command.h"
#include "init.h"
#include "path.h"
#include "space.h"
#include "fsgeom.h"

static void
info_help(void)
{
	printf(_(
"\n"
" Pretty-prints the filesystem geometry as derived from the superblock.\n"
" The output has the same format as mkfs.xfs, xfs_info, and other utilities.\n"
" The opened file must be an XFS mount point.\n"
"\n"
));

}

static int
info_f(
	int			argc,
	char			**argv)
{
	struct xfs_fsop_geom	geo;
	int			error;

	if (fs_table_lookup_mount(file->name) == NULL) {
		fprintf(stderr, _("%s: Not a XFS mount point.\n"), file->name);
		return 1;
	}

	/* get the current filesystem size & geometry */
	error = ioctl(file->fd, XFS_IOC_FSGEOMETRY, &geo);
	if (error) {
		/*
		 * OK, new xfsctl barfed - back off and try earlier version
		 * as we're probably running an older kernel version.
		 * Only field added in the v2 geometry xfsctl is "logsunit"
		 * so we'll zero that out for later display (as zero).
		 */
		geo.logsunit = 0;
		error = ioctl(file->fd, XFS_IOC_FSGEOMETRY_V1, &geo);
		if (error) {
			fprintf(stderr, _(
				"%s: cannot determine geometry of filesystem"
				" mounted at %s: %s\n"),
				progname, file->name, strerror(errno));
			exitcode = 1;
			return 0;
		}
	}

	xfs_report_geom(&geo, file->fs_path.fs_name, file->fs_path.fs_log,
			file->fs_path.fs_rt);
	return 0;
}

static const struct cmdinfo info_cmd = {
	.name =		"info",
	.altname =	"i",
	.cfunc =	info_f,
	.argmin =	0,
	.argmax =	0,
	.canpush =	0,
	.args =		NULL,
	.flags =	CMD_FLAG_ONESHOT,
	.oneline =	N_("pretty-print superblock geometry info"),
	.help =		info_help,
};

void
info_init(void)
{
	add_command(&info_cmd);
}