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kill struct xfs_mount_args

No need to parse the mount option into a structure before applying it
to struct xfs_mount.

The content of xfs_start_flags gets merged into xfs_parseargs.  Calls
inbetween don't care and can use mount members instead of the args
struct.

This patch uncovered that the mount option for shared filesystems wasn't
ever exposed on Linux.  The code to handle it is #if 0'ed in this patch
pending a decision on this feature.  I'll send a writeup about it to
the list soon.


Signed-off-by: Christoph Hellwig <hch@lst.de>
Merge of xfs-linux-melb:xfs-kern:32371a by kenmcd.

  kill struct xfs_mount_args 

/*
 * Copyright (c) 2000-2003,2005 Silicon Graphics, Inc.
 * All Rights Reserved.
 *
 * 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.
 *
 * 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 "xfs.h"
#include "xfs_fs.h"
#include "xfs_types.h"
#include "xfs_log.h"
#include "xfs_trans.h"
#include "xfs_sb.h"
#include "xfs_dmapi.h"
#include "xfs_inum.h"
#include "xfs_ag.h"
#include "xfs_mount.h"


static struct xfs_dmops xfs_dmcore_stub = {
	.xfs_send_data		= (xfs_send_data_t)fs_nosys,
	.xfs_send_mmap		= (xfs_send_mmap_t)fs_noerr,
	.xfs_send_destroy	= (xfs_send_destroy_t)fs_nosys,
	.xfs_send_namesp	= (xfs_send_namesp_t)fs_nosys,
	.xfs_send_mount		= (xfs_send_mount_t)fs_nosys,
	.xfs_send_unmount	= (xfs_send_unmount_t)fs_noerr,
};

int
xfs_dmops_get(struct xfs_mount *mp)
{
	if (mp->m_flags & XFS_MOUNT_DMAPI) {
		struct xfs_dmops *ops;

		ops = symbol_get(xfs_dmcore_xfs);
		if (!ops) {
			request_module("xfs_dmapi");
			ops = symbol_get(xfs_dmcore_xfs);
		}

		if (!ops) {
			cmn_err(CE_WARN, "XFS: no dmapi support available.");
			return EINVAL;
		}
		mp->m_dm_ops = ops;
	} else {
		mp->m_dm_ops = &xfs_dmcore_stub;
	}

	return 0;
}

void
xfs_dmops_put(struct xfs_mount *mp)
{
	if (mp->m_dm_ops != &xfs_dmcore_stub)
		symbol_put(xfs_dmcore_xfs);
}