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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) 2000-2006 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_bit.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_alloc.h"
#include "xfs_dmapi.h"
#include "xfs_quota.h"
#include "xfs_mount.h"
#include "xfs_bmap_btree.h"
#include "xfs_alloc_btree.h"
#include "xfs_ialloc_btree.h"
#include "xfs_dir2_sf.h"
#include "xfs_attr_sf.h"
#include "xfs_dinode.h"
#include "xfs_inode.h"
#include "xfs_ialloc.h"
#include "xfs_itable.h"
#include "xfs_btree.h"
#include "xfs_bmap.h"
#include "xfs_rtalloc.h"
#include "xfs_error.h"
#include "xfs_rw.h"
#include "xfs_acl.h"
#include "xfs_attr.h"
#include "xfs_buf_item.h"
#include "xfs_qm.h"


STATIC void
xfs_fill_statvfs_from_dquot(
	bhv_statvfs_t		*statp,
	xfs_disk_dquot_t	*dp)
{
	__uint64_t		limit;

	limit = dp->d_blk_softlimit ?
		be64_to_cpu(dp->d_blk_softlimit) :
		be64_to_cpu(dp->d_blk_hardlimit);
	if (limit && statp->f_blocks > limit) {
		statp->f_blocks = limit;
		statp->f_bfree =
			(statp->f_blocks > be64_to_cpu(dp->d_bcount)) ?
			 (statp->f_blocks - be64_to_cpu(dp->d_bcount)) : 0;
	}

	limit = dp->d_ino_softlimit ?
		be64_to_cpu(dp->d_ino_softlimit) :
		be64_to_cpu(dp->d_ino_hardlimit);
	if (limit && statp->f_files > limit) {
		statp->f_files = limit;
		statp->f_ffree =
			(statp->f_files > be64_to_cpu(dp->d_icount)) ?
			 (statp->f_ffree - be64_to_cpu(dp->d_icount)) : 0;
	}
}


/*
 * Directory tree accounting is implemented using project quotas, where
 * the project identifier is inherited from parent directories.
 * A statvfs (df, etc.) of a directory that is using project quota should
 * return a statvfs of the project, not the entire filesystem.
 * This makes such trees appear as if they are filesystems in themselves.
 */
STATIC void
xfs_qm_statvfs(
	xfs_inode_t		*ip,
	bhv_statvfs_t		*statp)
{
	xfs_mount_t		*mp = ip->i_mount;
	xfs_dquot_t		*dqp;

	if (!(ip->i_d.di_flags & XFS_DIFLAG_PROJINHERIT) ||
	    !((mp->m_qflags & (XFS_PQUOTA_ACCT|XFS_OQUOTA_ENFD))) ==
	    		      (XFS_PQUOTA_ACCT|XFS_OQUOTA_ENFD))
		return;

	if (!xfs_qm_dqget(mp, NULL, ip->i_d.di_projid, XFS_DQ_PROJ, 0, &dqp)) {
		xfs_disk_dquot_t	*dp = &dqp->q_core;

		xfs_fill_statvfs_from_dquot(statp, dp);
		xfs_qm_dqput(dqp);
	}
}

STATIC int
xfs_qm_newmount(
	xfs_mount_t	*mp,
	uint		*needquotamount,
	uint		*quotaflags)
{
	uint		quotaondisk;
	uint		uquotaondisk = 0, gquotaondisk = 0, pquotaondisk = 0;

	*quotaflags = 0;
	*needquotamount = B_FALSE;

	quotaondisk = xfs_sb_version_hasquota(&mp->m_sb) &&
				(mp->m_sb.sb_qflags & XFS_ALL_QUOTA_ACCT);

	if (quotaondisk) {
		uquotaondisk = mp->m_sb.sb_qflags & XFS_UQUOTA_ACCT;
		pquotaondisk = mp->m_sb.sb_qflags & XFS_PQUOTA_ACCT;
		gquotaondisk = mp->m_sb.sb_qflags & XFS_GQUOTA_ACCT;
	}

	/*
	 * If the device itself is read-only, we can't allow
	 * the user to change the state of quota on the mount -
	 * this would generate a transaction on the ro device,
	 * which would lead to an I/O error and shutdown
	 */

	if (((uquotaondisk && !XFS_IS_UQUOTA_ON(mp)) ||
	    (!uquotaondisk &&  XFS_IS_UQUOTA_ON(mp)) ||
	     (pquotaondisk && !XFS_IS_PQUOTA_ON(mp)) ||
	    (!pquotaondisk &&  XFS_IS_PQUOTA_ON(mp)) ||
	     (gquotaondisk && !XFS_IS_GQUOTA_ON(mp)) ||
	    (!gquotaondisk &&  XFS_IS_OQUOTA_ON(mp)))  &&
	    xfs_dev_is_read_only(mp, "changing quota state")) {
		cmn_err(CE_WARN,
			"XFS: please mount with%s%s%s%s.",
			(!quotaondisk ? "out quota" : ""),
			(uquotaondisk ? " usrquota" : ""),
			(pquotaondisk ? " prjquota" : ""),
			(gquotaondisk ? " grpquota" : ""));
		return XFS_ERROR(EPERM);
	}

	if (XFS_IS_QUOTA_ON(mp) || quotaondisk) {
		/*
		 * Call mount_quotas at this point only if we won't have to do
		 * a quotacheck.
		 */
		if (quotaondisk && !XFS_QM_NEED_QUOTACHECK(mp)) {
			/*
			 * If an error occured, qm_mount_quotas code
			 * has already disabled quotas. So, just finish
			 * mounting, and get on with the boring life
			 * without disk quotas.
			 */
			xfs_qm_mount_quotas(mp);
		} else {
			/*
			 * Clear the quota flags, but remember them. This
			 * is so that the quota code doesn't get invoked
			 * before we're ready. This can happen when an
			 * inode goes inactive and wants to free blocks,
			 * or via xfs_log_mount_finish.
			 */
			*needquotamount = B_TRUE;
			*quotaflags = mp->m_qflags;
			mp->m_qflags = 0;
		}
	}

	return 0;
}

STATIC int
xfs_qm_endmount(
	xfs_mount_t	*mp,
	uint		needquotamount,
	uint		quotaflags)
{
	if (needquotamount) {
		ASSERT(mp->m_qflags == 0);
		mp->m_qflags = quotaflags;
		xfs_qm_mount_quotas(mp);
	}

#if defined(DEBUG) && defined(XFS_LOUD_RECOVERY)
	if (! (XFS_IS_QUOTA_ON(mp)))
		xfs_fs_cmn_err(CE_NOTE, mp, "Disk quotas not turned on");
	else
		xfs_fs_cmn_err(CE_NOTE, mp, "Disk quotas turned on");
#endif

#ifdef QUOTADEBUG
	if (XFS_IS_QUOTA_ON(mp) && xfs_qm_internalqcheck(mp))
		cmn_err(CE_WARN, "XFS: mount internalqcheck failed");
#endif

	return 0;
}

STATIC void
xfs_qm_dqrele_null(
	xfs_dquot_t	*dq)
{
	/*
	 * Called from XFS, where we always check first for a NULL dquot.
	 */
	if (!dq)
		return;
	xfs_qm_dqrele(dq);
}


struct xfs_qmops xfs_qmcore_xfs = {
	.xfs_qminit		= xfs_qm_newmount,
	.xfs_qmdone		= xfs_qm_unmount_quotadestroy,
	.xfs_qmmount		= xfs_qm_endmount,
	.xfs_qmunmount		= xfs_qm_unmount_quotas,
	.xfs_dqrele		= xfs_qm_dqrele_null,
	.xfs_dqattach		= xfs_qm_dqattach,
	.xfs_dqdetach		= xfs_qm_dqdetach,
	.xfs_dqpurgeall		= xfs_qm_dqpurge_all,
	.xfs_dqvopalloc		= xfs_qm_vop_dqalloc,
	.xfs_dqvopcreate	= xfs_qm_vop_dqattach_and_dqmod_newinode,
	.xfs_dqvoprename	= xfs_qm_vop_rename_dqattach,
	.xfs_dqvopchown		= xfs_qm_vop_chown,
	.xfs_dqvopchownresv	= xfs_qm_vop_chown_reserve,
	.xfs_dqstatvfs		= xfs_qm_statvfs,
	.xfs_dqsync		= xfs_qm_sync,
	.xfs_quotactl		= xfs_qm_quotactl,
	.xfs_dqtrxops		= &xfs_trans_dquot_ops,
};
EXPORT_SYMBOL(xfs_qmcore_xfs);

static int __init
xfs_qm_init(void)
{
	printk(KERN_INFO "SGI XFS Quota Management subsystem\n");
	mutex_init(&xfs_Gqm_lock);
	xfs_qm_init_procfs();
	return 0;
}

static void __exit
xfs_qm_exit(void)
{
	xfs_qm_cleanup_procfs();
	if (qm_dqzone)
		kmem_zone_destroy(qm_dqzone);
	if (qm_dqtrxzone)
		kmem_zone_destroy(qm_dqtrxzone);
}

module_init(xfs_qm_init);
module_exit(xfs_qm_exit);