/*

   * 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

   */
  #ifndef __XFS_QM_H__
  #define __XFS_QM_H__
  
  #include "xfs_dquot_item.h"
  #include "xfs_dquot.h"
  #include "xfs_quota_priv.h"
  #include "xfs_qm_stats.h"
  
  struct xfs_qm;
  struct xfs_inode;

  extern uint		ndquot;

  extern struct mutex	xfs_Gqm_lock;

  extern struct xfs_qm	*xfs_Gqm;
  extern kmem_zone_t	*qm_dqzone;
  extern kmem_zone_t	*qm_dqtrxzone;
  
  /*

   * Ditto, for xfs_qm_dqreclaim_one.
   */
  #define XFS_QM_RECLAIM_MAX_RESTARTS	4
  
  /*
   * Ideal ratio of free to in use dquots. Quota manager makes an attempt
   * to keep this balance.
   */
  #define XFS_QM_DQFREE_RATIO		2
  
  /*
   * Dquot hashtable constants/threshold values.
   */

  #define XFS_QM_HASHSIZE_LOW		(PAGE_SIZE / sizeof(xfs_dqhash_t))
  #define XFS_QM_HASHSIZE_HIGH		((PAGE_SIZE * 4) / sizeof(xfs_dqhash_t))

  
  /*

   * This defines the unit of allocation of dquots.
   * Currently, it is just one file system block, and a 4K blk contains 30
   * (136 * 30 = 4080) dquots. It's probably not worth trying to make
   * this more dynamic.
   * XXXsup However, if this number is changed, we have to make sure that we don't
   * implicitly assume that we do allocations in chunks of a single filesystem
   * block in the dquot/xqm code.
   */
  #define XFS_DQUOT_CLUSTER_SIZE_FSB	(xfs_filblks_t)1

  
  typedef xfs_dqhash_t	xfs_dqlist_t;

  
  /*
   * Quota Manager (global) structure. Lives only in core.
   */
  typedef struct xfs_qm {
  	xfs_dqlist_t	*qm_usr_dqhtable;/* udquot hash table */
  	xfs_dqlist_t	*qm_grp_dqhtable;/* gdquot hash table */
  	uint		 qm_dqhashmask;	 /* # buckets in dq hashtab - 1 */

  	struct list_head qm_dqfrlist;	 /* freelist of dquots */
  	struct mutex	 qm_dqfrlist_lock;
  	int		 qm_dqfrlist_cnt;

  	atomic_t	 qm_totaldquots; /* total incore dquots */
  	uint		 qm_nrefs;	 /* file systems with quota on */
  	int		 qm_dqfree_ratio;/* ratio of free to inuse dquots */
  	kmem_zone_t	*qm_dqzone;	 /* dquot mem-alloc zone */
  	kmem_zone_t	*qm_dqtrxzone;	 /* t_dqinfo of transactions */
  } xfs_qm_t;
  
  /*
   * Various quota information for individual filesystems.
   * The mount structure keeps a pointer to this.
   */
  typedef struct xfs_quotainfo {
  	xfs_inode_t	*qi_uquotaip;	 /* user quota inode */
  	xfs_inode_t	*qi_gquotaip;	 /* group quota inode */

  	struct list_head qi_dqlist;	 /* all dquots in filesys */
  	struct mutex	 qi_dqlist_lock;
  	int		 qi_dquots;

  	int		 qi_dqreclaims;	 /* a change here indicates
  					    a removal in the dqlist */
  	time_t		 qi_btimelimit;	 /* limit for blks timer */
  	time_t		 qi_itimelimit;	 /* limit for inodes timer */
  	time_t		 qi_rtbtimelimit;/* limit for rt blks timer */

  	xfs_qwarncnt_t	 qi_bwarnlimit;	 /* limit for blks warnings */
  	xfs_qwarncnt_t	 qi_iwarnlimit;	 /* limit for inodes warnings */
  	xfs_qwarncnt_t	 qi_rtbwarnlimit;/* limit for rt blks warnings */

  	struct mutex	 qi_quotaofflock;/* to serialize quotaoff */

  	xfs_filblks_t	 qi_dqchunklen;	 /* # BBs in a chunk of dqs */
  	uint		 qi_dqperchunk;	 /* # ondisk dqs in above chunk */
  	xfs_qcnt_t	 qi_bhardlimit;	 /* default data blk hard limit */
  	xfs_qcnt_t	 qi_bsoftlimit;	 /* default data blk soft limit */
  	xfs_qcnt_t	 qi_ihardlimit;	 /* default inode count hard limit */
  	xfs_qcnt_t	 qi_isoftlimit;	 /* default inode count soft limit */
  	xfs_qcnt_t	 qi_rtbhardlimit;/* default realtime blk hard limit */
  	xfs_qcnt_t	 qi_rtbsoftlimit;/* default realtime blk soft limit */
  } xfs_quotainfo_t;

  extern void	xfs_trans_mod_dquot(xfs_trans_t *, xfs_dquot_t *, uint, long);
  extern int	xfs_trans_reserve_quota_bydquots(xfs_trans_t *, xfs_mount_t *,
  			xfs_dquot_t *, xfs_dquot_t *, long, long, uint);
  extern void	xfs_trans_dqjoin(xfs_trans_t *, xfs_dquot_t *);
  extern void	xfs_trans_log_dquot(xfs_trans_t *, xfs_dquot_t *);
  
  /*
   * We keep the usr and grp dquots separately so that locking will be easier
   * to do at commit time. All transactions that we know of at this point
   * affect no more than two dquots of one type. Hence, the TRANS_MAXDQS value.
   */
  #define XFS_QM_TRANS_MAXDQS		2
  typedef struct xfs_dquot_acct {
  	xfs_dqtrx_t	dqa_usrdquots[XFS_QM_TRANS_MAXDQS];
  	xfs_dqtrx_t	dqa_grpdquots[XFS_QM_TRANS_MAXDQS];
  } xfs_dquot_acct_t;
  
  /*
   * Users are allowed to have a usage exceeding their softlimit for
   * a period this long.
   */
  #define XFS_QM_BTIMELIMIT	(7 * 24*60*60)          /* 1 week */
  #define XFS_QM_RTBTIMELIMIT	(7 * 24*60*60)          /* 1 week */
  #define XFS_QM_ITIMELIMIT	(7 * 24*60*60)          /* 1 week */
  
  #define XFS_QM_BWARNLIMIT	5
  #define XFS_QM_IWARNLIMIT	5

  #define XFS_QM_RTBWARNLIMIT	5

  extern void		xfs_qm_destroy_quotainfo(xfs_mount_t *);

  extern int		xfs_qm_quotacheck(xfs_mount_t *);

  extern int		xfs_qm_write_sb_changes(xfs_mount_t *, __int64_t);

  
  /* dquot stuff */
  extern boolean_t	xfs_qm_dqalloc_incore(xfs_dquot_t **);

  extern int		xfs_qm_dqpurge_all(xfs_mount_t *, uint);
  extern void		xfs_qm_dqrele_all_inodes(xfs_mount_t *, uint);

  /* quota ops */
  extern int		xfs_qm_scall_trunc_qfiles(xfs_mount_t *, uint);
  extern int		xfs_qm_scall_getquota(xfs_mount_t *, xfs_dqid_t, uint,
  					fs_disk_quota_t *);
  extern int		xfs_qm_scall_setqlim(xfs_mount_t *, xfs_dqid_t, uint,
  					fs_disk_quota_t *);
  extern int		xfs_qm_scall_getqstat(xfs_mount_t *, fs_quota_stat_t *);
  extern int		xfs_qm_scall_quotaon(xfs_mount_t *, uint);
  extern int		xfs_qm_scall_quotaoff(xfs_mount_t *, uint);

  #endif /* __XFS_QM_H__ */