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remove dependency of the quota module on behaviors

Mount options are now parsed by the main XFS module and rejected if quota
support is not available, and there are some new quota operation for the
quotactl syscall and calls to quote in the mount, unmount and sync
callchains.


Signed-off-by: Christoph Hellwig <hch@lst.de>
Merge of xfs-linux-melb:xfs-kern:29503a by kenmcd.

  remove dependency of the quota module on behaviors

/*
 * 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 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_inum.h"
#include "xfs_trans.h"
#include "xfs_sb.h"
#include "xfs_ag.h"
#include "xfs_dir2.h"
#include "xfs_dmapi.h"
#include "xfs_mount.h"
#include "xfs_quota.h"
#include "xfs_error.h"
#include "xfs_clnt.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);
	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;
}

static struct xfs_qmops 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,
	.xfs_dqstatvfs		= (xfs_dqstatvfs_t) fs_noval,
	.xfs_dqsync		= (xfs_dqsync_t) fs_noerr,
	.xfs_quotactl		= (xfs_quotactl_t) fs_nosys,
};

int
xfs_qmops_get(struct xfs_mount *mp, struct xfs_mount_args *args)
{
	if (args->flags & (XFSMNT_UQUOTA | XFSMNT_PQUOTA | XFSMNT_GQUOTA)) {
		struct xfs_qmops *ops;

		ops = symbol_get(xfs_qmcore_xfs);
		if (!ops) {
			request_module("xfs_quota");
			ops = symbol_get(xfs_qmcore_xfs);
		}

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

	return 0;
}

void
xfs_qmops_put(struct xfs_mount *mp)
{
	if (mp->m_qm_ops != &xfs_qmcore_stub)
		symbol_put(xfs_qmcore_xfs);
}