/* * Copyright (c) 2000-2002 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/ */#ifndef __XFS_DQUOT_H__#define __XFS_DQUOT_H__/* * Dquots are structures that hold quota information about a user or a group, * much like inodes are for files. In fact, dquots share many characteristics * with inodes. However, dquots can also be a centralized resource, relative * to a collection of inodes. In this respect, dquots share some characteristics * of the superblock. * XFS dquots exploit both those in its algorithms. They make every attempt * to not be a bottleneck when quotas are on and have minimal impact, if any, * when quotas are off. *//* * The hash chain headers (hash buckets) */typedef struct xfs_dqhash {	struct xfs_dquot *qh_next;	mutex_t		  qh_lock;	uint		  qh_version;	/* ever increasing version */	uint		  qh_nelems;	/* number of dquots on the list */} xfs_dqhash_t;typedef struct xfs_dqlink {	struct xfs_dquot  *ql_next;	/* forward link */	struct xfs_dquot **ql_prevp;	/* pointer to prev ql_next */} xfs_dqlink_t;struct xfs_mount;struct xfs_trans;/* * This is the marker which is designed to occupy the first few * bytes of the xfs_dquot_t structure. Even inside this, the freelist pointers * must come first. * This serves as the marker ("sentinel") when we have to restart list * iterations because of locking considerations. */typedef struct xfs_dqmarker {	struct xfs_dquot*dqm_flnext;	/* link to freelist: must be first */	struct xfs_dquot*dqm_flprev;	xfs_dqlink_t	 dqm_mplist;	/* link to mount's list of dquots */	xfs_dqlink_t	 dqm_hashlist;	/* link to the hash chain */	uint		 dqm_flags;	/* various flags (XFS_DQ_*) */} xfs_dqmarker_t;/* * The incore dquot structure */typedef struct xfs_dquot {	xfs_dqmarker_t	 q_lists;	/* list ptrs, q_flags (marker) */	xfs_dqhash_t	*q_hash;	/* the hashchain header */	struct xfs_mount*q_mount;	/* filesystem this relates to */	struct xfs_trans*q_transp;	/* trans this belongs to currently */	uint		 q_nrefs;	/* # active refs from inodes */	xfs_daddr_t	 q_blkno;	/* blkno of dquot buffer */	int		 q_bufoffset;	/* off of dq in buffer (# dquots) */	xfs_fileoff_t	 q_fileoffset;	/* offset in quotas file */	struct xfs_dquot*q_gdquot;	/* group dquot, hint only */	xfs_disk_dquot_t q_core;	/* actual usage & quotas */	xfs_dq_logitem_t q_logitem;	/* dquot log item */	xfs_qcnt_t	 q_res_bcount;	/* total regular nblks used+reserved */	xfs_qcnt_t	 q_res_icount;	/* total inos allocd+reserved */	xfs_qcnt_t	 q_res_rtbcount;/* total realtime blks used+reserved */	mutex_t		 q_qlock;	/* quota lock */	sema_t		 q_flock;	/* flush lock */	uint		 q_pincount;	/* pin count for this dquot */	sv_t		 q_pinwait;	/* sync var for pinning */#ifdef XFS_DQUOT_TRACE	struct ktrace	*q_trace;	/* trace header structure */#endif} xfs_dquot_t;#define dq_flnext	q_lists.dqm_flnext#define dq_flprev	q_lists.dqm_flprev#define dq_mplist	q_lists.dqm_mplist#define dq_hashlist	q_lists.dqm_hashlist#define dq_flags	q_lists.dqm_flags#define XFS_DQHOLD(dqp)		((dqp)->q_nrefs++)/* * Quota Accounting flags */#define XFS_ALL_QUOTA_ACCT	(XFS_UQUOTA_ACCT | XFS_GQUOTA_ACCT)#define XFS_ALL_QUOTA_ENFD	(XFS_UQUOTA_ENFD | XFS_GQUOTA_ENFD)#define XFS_ALL_QUOTA_CHKD	(XFS_UQUOTA_CHKD | XFS_GQUOTA_CHKD)#define XFS_ALL_QUOTA_ACTV	(XFS_UQUOTA_ACTIVE | XFS_GQUOTA_ACTIVE)#define XFS_ALL_QUOTA_ACCT_ENFD (XFS_UQUOTA_ACCT|XFS_UQUOTA_ENFD|\				 XFS_GQUOTA_ACCT|XFS_GQUOTA_ENFD)#define XFS_IS_QUOTA_RUNNING(mp)  ((mp)->m_qflags & XFS_ALL_QUOTA_ACCT)#define XFS_IS_UQUOTA_RUNNING(mp) ((mp)->m_qflags & XFS_UQUOTA_ACCT)#define XFS_IS_GQUOTA_RUNNING(mp) ((mp)->m_qflags & XFS_GQUOTA_ACCT)/* * Quota Limit Enforcement flags */#define XFS_IS_QUOTA_ENFORCED(mp)	((mp)->m_qflags & XFS_ALL_QUOTA_ENFD)#define XFS_IS_UQUOTA_ENFORCED(mp)	((mp)->m_qflags & XFS_UQUOTA_ENFD)#define XFS_IS_GQUOTA_ENFORCED(mp)	((mp)->m_qflags & XFS_GQUOTA_ENFD)#ifdef DEBUGstatic inline intXFS_DQ_IS_LOCKED(xfs_dquot_t *dqp){	if (mutex_trylock(&dqp->q_qlock)) {		mutex_unlock(&dqp->q_qlock);		return 0;	}	return 1;}#endif/* * The following three routines simply manage the q_flock * semaphore embedded in the dquot.  This semaphore synchronizes * processes attempting to flush the in-core dquot back to disk. */#define xfs_dqflock(dqp)	 { psema(&((dqp)->q_flock), PINOD | PRECALC);\				   (dqp)->dq_flags |= XFS_DQ_FLOCKED; }#define xfs_dqfunlock(dqp)	 { ASSERT(valusema(&((dqp)->q_flock)) <= 0); \				   vsema(&((dqp)->q_flock)); \				   (dqp)->dq_flags &= ~(XFS_DQ_FLOCKED); }#define XFS_DQ_PINLOCK(dqp)	   mutex_spinlock( \				     &(XFS_DQ_TO_QINF(dqp)->qi_pinlock))#define XFS_DQ_PINUNLOCK(dqp, s)   mutex_spinunlock( \				     &(XFS_DQ_TO_QINF(dqp)->qi_pinlock), s)#define XFS_DQ_IS_FLUSH_LOCKED(dqp) (valusema(&((dqp)->q_flock)) <= 0)#define XFS_DQ_IS_ON_FREELIST(dqp)  ((dqp)->dq_flnext != (dqp))#define XFS_DQ_IS_DIRTY(dqp)	((dqp)->dq_flags & XFS_DQ_DIRTY)#define XFS_QM_ISUDQ(dqp)	((dqp)->dq_flags & XFS_DQ_USER)#define XFS_DQ_TO_QINF(dqp)	((dqp)->q_mount->m_quotainfo)#define XFS_DQ_TO_QIP(dqp)	(XFS_QM_ISUDQ(dqp) ? \				 XFS_DQ_TO_QINF(dqp)->qi_uquotaip : \				 XFS_DQ_TO_QINF(dqp)->qi_gquotaip)#define XFS_IS_THIS_QUOTA_OFF(d) (! (XFS_QM_ISUDQ(d) ? \				     (XFS_IS_UQUOTA_ON((d)->q_mount)) : \				     (XFS_IS_GQUOTA_ON((d)->q_mount))))#ifdef XFS_DQUOT_TRACE/* * Dquot Tracing stuff. */#define DQUOT_TRACE_SIZE	64#define DQUOT_KTRACE_ENTRY	1extern void		__xfs_dqtrace_entry(xfs_dquot_t *dqp, char *func,					    void *, xfs_inode_t *);#define xfs_dqtrace_entry_ino(a,b,ip) \		__xfs_dqtrace_entry((a), (b), (void*)__return_address, (ip))#define xfs_dqtrace_entry(a,b) \		__xfs_dqtrace_entry((a), (b), (void*)__return_address, NULL)#else#define xfs_dqtrace_entry(a,b)#define xfs_dqtrace_entry_ino(a,b,ip)#endif#ifdef QUOTADEBUGextern void		xfs_qm_dqprint(xfs_dquot_t *);#else#define xfs_qm_dqprint(a)#endifextern void		xfs_qm_dqdestroy(xfs_dquot_t *);extern int		xfs_qm_dqflush(xfs_dquot_t *, uint);extern int		xfs_qm_dqpurge(xfs_dquot_t *, uint);extern void		xfs_qm_dqunpin_wait(xfs_dquot_t *);extern int		xfs_qm_dqlock_nowait(xfs_dquot_t *);extern int		xfs_qm_dqflock_nowait(xfs_dquot_t *);extern void		xfs_qm_dqflock_pushbuf_wait(xfs_dquot_t *dqp);extern void		xfs_qm_adjust_dqtimers(xfs_mount_t *,					xfs_disk_dquot_t *);extern int		xfs_qm_dqwarn(xfs_disk_dquot_t *, uint);extern int		xfs_qm_dqget(xfs_mount_t *, xfs_inode_t *,					xfs_dqid_t, uint, uint, xfs_dquot_t **);extern void		xfs_qm_dqput(xfs_dquot_t *);extern void		xfs_qm_dqrele(xfs_dquot_t *);extern void		xfs_dqlock(xfs_dquot_t *);extern void		xfs_dqlock2(xfs_dquot_t *, xfs_dquot_t *);extern void		xfs_dqunlock(xfs_dquot_t *);extern void		xfs_dqunlock_nonotify(xfs_dquot_t *);#endif /* __XFS_DQUOT_H__ */