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Encumbrance review done.
Add copyright and license words consistent with GPL.
Refer to http://fsg.melbourne.sgi.com/reviews/ for details.

There is a slight change in the license terms and conditions words
to go with the copyrights, so most of the files are not getting
new GPL's, just updated versions ... but there are 20-30 more files
here as well.

/*
 * Copyright (C) 1999 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; either version 2 of the License, or (at
 * your option) any later version.
 * 
 * This program is distributed in the hope that it will 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., 59 Temple Place - Suite 330, Boston MA 02111-1307, USA.
 */
#ifndef __XFS_QM_H__
#define __XFS_QM_H__

#ident "$Revision: 1.12 $"

struct  xfs_dqhash;
struct  xfs_inode;
struct  xfs_dquot;
struct  xfs_qm;

/* 
 * The global quota manager. There is only one of these for the entire
 * system, _not_ one per file system. XQM keeps track of the overall
 * quota functionality, including maintaining the freelist and hash
 * tables of dquots.
 */
extern	struct xfs_qm		*xfs_Gqm;		
extern	mutex_t			xfs_Gqm_lock;

/*
 * Used in xfs_qm_sync called by xfs_sync to count the max times that it can
 * iterate over the mountpt's dquot list in one call.
 */
#define XFS_QM_SYNC_MAX_RESTARTS	7

/*
 * 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_NCSIZE_THRESHOLD		5000
#define XFS_QM_HASHSIZE_LOW		32
#define XFS_QM_HASHSIZE_HIGH		64

/*
 * We output a cmn_err when quotachecking a quota file with more than
 * this many fsbs.
 */
#define XFS_QM_BIG_QCHECK_NBLKS		500

/*
 * 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
/*
 * When doing a quotacheck, we log dquot clusters of this many FSBs at most
 * in a single transaction. We don't want to ask for too huge a log reservation.
 */
#define XFS_QM_MAX_DQCLUSTER_LOGSZ	3

typedef xfs_dqhash_t	xfs_dqlist_t;
/*
 * The freelist head. The first two fields match the first two in the
 * xfs_dquot_t structure (in xfs_dqmarker_t)
 */
typedef struct xfs_frlist {
       struct xfs_dquot	*qh_next;
       struct xfs_dquot	*qh_prev;
       mutex_t	 	 qh_lock;
       uint      	 qh_version;
       uint	 	 qh_nelems;
} xfs_frlist_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_prj_dqhtable;/* pdquot hash table */
	uint		 qm_dqhashmask;  /* # buckets in dq hashtab - 1 */
	xfs_frlist_t	 qm_dqfreelist;  /* freelist of dquots */
	uint		 qm_totaldquots; /* total incore dquots */
	uint		 qm_nrefs;	 /* file systems with quota on */
	int		 qm_dqfree_ratio;/* ratio of free to inuse dquots */
	zone_t		*qm_dqzone;	 /* dquot mem-alloc zone */
	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_pquotaip;	 /* project quota inode */
	lock_t           qi_pinlock;     /* dquot pinning mutex */
	xfs_dqlist_t	 qi_dqlist;      /* all dquots in filesys */
	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 num warnings */
	xfs_qwarncnt_t	 qi_iwarnlimit;	 /* limit for num warnings */
	mutex_t		 qi_quotaofflock;/* to serialize quotaoff */
	/* Some useful precalculated constants */
	xfs_filblks_t	 qi_dqchunklen;  /* # BBs in a chunk of dqs */
	uint		 qi_dqperchunk;  /* # ondisk dqs in above chunk */
} xfs_quotainfo_t;	


/*
 * The structure kept inside the xfs_trans_t keep track of dquot changes
 * within a transaction and apply them later.
 */
typedef struct xfs_dqtrx {
	struct xfs_dquot *qt_dquot;	  /* the dquot this refers to */
	ulong		qt_blk_res;	  /* blks reserved on a dquot */
	ulong		qt_blk_res_used;  /* blks used from the reservation */
	ulong		qt_ino_res;	  /* inode reserved on a dquot */
	ulong		qt_ino_res_used;  /* inodes used from the reservation */
	long		qt_bcount_delta;  /* dquot blk count changes */
	long		qt_delbcnt_delta; /* delayed dquot blk count changes */
	long		qt_icount_delta;  /* dquot inode count changes */
	ulong		qt_rtblk_res;	  /* # blks reserved on a dquot */
	ulong		qt_rtblk_res_used;/* # blks used from reservation */
	long		qt_rtbcount_delta;/* dquot realtime blk changes */
	long		qt_delrtb_delta;  /* delayed RT blk count changes */
} xfs_dqtrx_t;
 
/*
 * We keep the usr and prj 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_prjdquots[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	DQ_BTIMELIMIT
#define XFS_QM_RTBTIMELIMIT	DQ_BTIMELIMIT
#define XFS_QM_ITIMELIMIT	DQ_FTIMELIMIT

#define XFS_QM_BWARNLIMIT	5
#define XFS_QM_IWARNLIMIT	5

#define XFS_QM_LOCK(xqm)	(mutex_lock(&xqm##_lock, PINOD))
#define XFS_QM_UNLOCK(xqm)	(mutex_unlock(&xqm##_lock))
#define XFS_QM_HOLD(xqm)	((xqm)->qm_nrefs++)
#define XFS_QM_RELE(xqm)	((xqm)->qm_nrefs--)

#if DEBUG
extern int 		xfs_quotadebug;
extern int		xfs_qm_internalqcheck(xfs_mount_t *);
#endif 

extern int		xfs_qm_init_quotainfo(xfs_mount_t *);
extern void 		xfs_qm_destroy_quotainfo(xfs_mount_t *);
extern void		xfs_qm_dqunlink(xfs_dquot_t *);
extern boolean_t	xfs_qm_dqalloc_incore(xfs_dquot_t **);
extern int 		xfs_qm_write_sb_changes(xfs_mount_t *, __int64_t);
extern int		xfs_qm_scall_quotaoff(xfs_mount_t *, uint, boolean_t);

/* list stuff */
extern void		xfs_qm_freelist_init(xfs_frlist_t *);
extern void		xfs_qm_freelist_destroy(xfs_frlist_t *);
extern void		xfs_qm_freelist_insert(xfs_frlist_t *, xfs_dquot_t *);
extern void 		xfs_qm_freelist_append(xfs_frlist_t *, xfs_dquot_t *);
extern void		xfs_qm_freelist_unlink(xfs_dquot_t *);
extern int		xfs_qm_freelist_lock_nowait(xfs_qm_t *);
extern int		xfs_qm_mplist_nowait(xfs_mount_t *);
extern int		xfs_qm_dqhashlock_nowait(xfs_dquot_t *);

#ifdef QUOTADEBUG
extern void		xfs_qm_freelist_print(xfs_frlist_t *, char *);
#else
#define xfs_qm_freelist_print(a, b)
#endif

#endif /* __XFS_QM_H__ */