linux-vybrid_public/fs/xfs/xfs_qmops.c

/*
 * Copyright (c) 2000-2005 Silicon Graphics, Inc.  All Rights Reserved.
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms of version 2 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.
 *
 * Further, this software is distributed without any warranty that it is
 * free of the rightful claim of any third person regarding infringement
 * or the like.	 Any license provided herein, whether implied or
 * otherwise, applies only to this software file.  Patent licenses, if
 * any, provided herein do not apply to combinations of this program with
 * other software, or any other product whatsoever.
 *
 * You should have received a copy of the GNU General Public License along
 * with this program; if not, write the Free Software Foundation, Inc., 59
 * Temple Place - Suite 330, Boston MA 02111-1307, USA.
 *
 * Contact information: Silicon Graphics, Inc., 1600 Amphitheatre Pkwy,
 * Mountain View, CA  94043, or:
 *
 * http://www.sgi.com
 *
 * For further information regarding this notice, see:
 *
 * http://oss.sgi.com/projects/GenInfo/SGIGPLNoticeExplan/
 */
#include "xfs.h"

#include "xfs_macros.h"
#include "xfs_types.h"
#include "xfs_inum.h"
#include "xfs_log.h"
#include "xfs_trans.h"
#include "xfs_sb.h"
#include "xfs_ag.h"
#include "xfs_dir.h"
#include "xfs_dir2.h"
#include "xfs_dmapi.h"
#include "xfs_mount.h"
#include "xfs_quota.h"
#include "xfs_error.h"

STATIC struct xfs_dquot *
xfs_dqvopchown_default(
	struct xfs_trans	*tp,
	struct xfs_inode	*ip,
	struct xfs_dquot	**dqp,
	struct xfs_dquot	*dq)
{
	return NULL;
}

/*
 * Clear the quotaflags in memory and in the superblock.
 */
int
xfs_mount_reset_sbqflags(xfs_mount_t *mp)
{
	int			error;
	xfs_trans_t		*tp;
	unsigned long		s;

	mp->m_qflags = 0;
	/*
	 * It is OK to look at sb_qflags here in mount path,
	 * without SB_LOCK.
	 */
	if (mp->m_sb.sb_qflags == 0)
		return 0;
	s = XFS_SB_LOCK(mp);
	mp->m_sb.sb_qflags = 0;
	XFS_SB_UNLOCK(mp, s);

	/*
	 * if the fs is readonly, let the incore superblock run
	 * with quotas off but don't flush the update out to disk
	 */
	if (XFS_MTOVFS(mp)->vfs_flag & VFS_RDONLY)
		return 0;
#ifdef QUOTADEBUG
	xfs_fs_cmn_err(CE_NOTE, mp, "Writing superblock quota changes");
#endif
	tp = xfs_trans_alloc(mp, XFS_TRANS_QM_SBCHANGE);
	if ((error = xfs_trans_reserve(tp, 0, mp->m_sb.sb_sectsize + 128, 0, 0,
				      XFS_DEFAULT_LOG_COUNT))) {
		xfs_trans_cancel(tp, 0);
		xfs_fs_cmn_err(CE_ALERT, mp,
			"xfs_mount_reset_sbqflags: Superblock update failed!");
		return error;
	}
	xfs_mod_sb(tp, XFS_SB_QFLAGS);
	error = xfs_trans_commit(tp, 0, NULL);
	return error;
}

STATIC int
xfs_noquota_init(
	xfs_mount_t	*mp,
	uint		*needquotamount,
	uint		*quotaflags)
{
	int		error = 0;

	*quotaflags = 0;
	*needquotamount = B_FALSE;

	ASSERT(!XFS_IS_QUOTA_ON(mp));

	/*
	 * If a file system had quotas running earlier, but decided to
	 * mount without -o uquota/pquota/gquota options, revoke the
	 * quotachecked license.
	 */
	if (mp->m_sb.sb_qflags & XFS_ALL_QUOTA_ACCT) {
		cmn_err(CE_NOTE,
                        "XFS resetting qflags for filesystem %s",
                        mp->m_fsname);

		error = xfs_mount_reset_sbqflags(mp);
	}
	return error;
}

xfs_qmops_t	xfs_qmcore_stub = {
	.xfs_qminit		= (xfs_qminit_t) xfs_noquota_init,
	.xfs_qmdone		= (xfs_qmdone_t) fs_noerr,
	.xfs_qmmount		= (xfs_qmmount_t) fs_noerr,
	.xfs_qmunmount		= (xfs_qmunmount_t) fs_noerr,
	.xfs_dqrele		= (xfs_dqrele_t) fs_noerr,
	.xfs_dqattach		= (xfs_dqattach_t) fs_noerr,
	.xfs_dqdetach		= (xfs_dqdetach_t) fs_noerr,
	.xfs_dqpurgeall		= (xfs_dqpurgeall_t) fs_noerr,
	.xfs_dqvopalloc		= (xfs_dqvopalloc_t) fs_noerr,
	.xfs_dqvopcreate	= (xfs_dqvopcreate_t) fs_noerr,
	.xfs_dqvoprename	= (xfs_dqvoprename_t) fs_noerr,
	.xfs_dqvopchown		= xfs_dqvopchown_default,
	.xfs_dqvopchownresv	= (xfs_dqvopchownresv_t) fs_noerr,
};