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The external interface (to the rest of XFS) of disk quota subsystem.
This is the only header file meant to be included by XFS src files,
with the exception of xfs_log_recover and xfsidbg

#ifndef __XFS_QUOTA_H__
#define __XFS_QUOTA_H__
#ident "$Revision: 7.0 $"
/*
 * External Interface to the XFS disk quota subsystem.
 */
struct  xfs_dqhash;
struct  xfs_inode;
struct  xfs_disk_dquot;
struct  xfs_dquot;
struct  xfs_mount;
struct  xfs_trans;
struct  vfs;

/* 
 * We use only 16-bit prid's in the inode, not the 64-bit version in the proc.
 * uid_t is hard-coded to 32 bits in the inode. Hence, an 'id' in a dquot is
 * 32 bits..
 */
typedef __int32_t	xfs_dqid_t;
/*
 * Eventhough users may not have quota limits occupying all 64-bits, 
 * they may need 64-bit accounting. Hence, 64-bit quota-counters,
 * and quota-limits. This is a waste in the common case, but heh ...
 */
typedef __uint64_t	xfs_qcnt_t;
typedef __uint16_t      xfs_qwarncnt_t;

/*
 * Checking XFS_IS_*QUOTA_ON() while holding any inode lock guarantees
 * quota will be not be switched off as long as that inode lock is held.
 */
#define XFS_IS_QUOTA_ON(mp)  	((mp)->m_flags & (XFS_MOUNT_UDQ_ACTIVE | \
						  XFS_MOUNT_PDQ_ACTIVE))
#define XFS_IS_UQUOTA_ON(mp)	((mp)->m_flags & XFS_MOUNT_UDQ_ACTIVE)
#define XFS_IS_PQUOTA_ON(mp) 	((mp)->m_flags & XFS_MOUNT_PDQ_ACTIVE)

/*
 * Flags to tell various functions what to do. Not all of these are meaningful
 * to a single function. None of these XFS_QMOPT_* flags are meant to have
 * persistent values (ie. their values can and will change between versions)
 */
#define XFS_QMOPT_DQLOCK	0x000001 /* dqlock */
#define XFS_QMOPT_DQALLOC	0x000002 /* alloc dquot ondisk if needed */
#define XFS_QMOPT_UQUOTA	0x000004 /* user dquot requested */
#define XFS_QMOPT_PQUOTA	0x000008 /* proj dquot requested */
#define XFS_QMOPT_FORCE_RES	0x000010 /* ignore quota limits */
#define XFS_QMOPT_DQSUSER	0x000020 /* don't cache super users dquot */
#define XFS_QMOPT_INOQCHK	0x000040 /* do a inoquotacheck */
#define XFS_QMOPT_QUOTAOFF	0x000080 /* quotas are being turned off */
#define XFS_QMOPT_UMOUNTING	0x000100 /* filesys is being unmounted */
#define XFS_QMOPT_DOLOG		0x000200 /* log buf changes (in quotacheck) */
#define XFS_QMOPT_DOWARN        0x000400 /* increase warning cnt if necessary */
#define XFS_QMOPT_ILOCKED	0x000800 /* Inode is already locked (excl) */
/* 
 * flags to xfs_trans_mod_dquot to indicate which field needs to be
 * modified.
 */
#define XFS_QMOPT_RES_REGBLKS 	0x001000
#define XFS_QMOPT_RES_RTBLKS	0x002000
#define XFS_QMOPT_BCOUNT	0x004000
#define XFS_QMOPT_ICOUNT	0x008000
#define XFS_QMOPT_RTBCOUNT	0x010000
#define XFS_QMOPT_DELBCOUNT	0x020000
#define XFS_QMOPT_DELRTBCOUNT	0x040000

/*
 * flags for dqflush and dqflush_all.
 */
#define XFS_QMOPT_SYNC		0x100000
#define XFS_QMOPT_ASYNC		0x200000
#define XFS_QMOPT_DELWRI	0x400000

/* 
 * flags to xfs_trans_mod_dquot.
 */
#define XFS_TRANS_DQ_RES_BLKS	XFS_QMOPT_RES_REGBLKS
#define XFS_TRANS_DQ_RES_RTBLKS	XFS_QMOPT_RES_RTBLKS
#define XFS_TRANS_DQ_BCOUNT	XFS_QMOPT_BCOUNT
#define XFS_TRANS_DQ_DELBCOUNT	XFS_QMOPT_DELBCOUNT
#define XFS_TRANS_DQ_ICOUNT	XFS_QMOPT_ICOUNT
#define XFS_TRANS_DQ_RTBCOUNT	XFS_QMOPT_RTBCOUNT
#define XFS_TRANS_DQ_DELRTBCOUNT XFS_QMOPT_DELRTBCOUNT


#define XFS_QMOPT_QUOTALL	(XFS_QMOPT_UQUOTA|XFS_QMOPT_PQUOTA)
#define XFS_QMOPT_RESBLK_MASK	(XFS_QMOPT_RES_REGBLKS | XFS_QMOPT_RES_RTBLKS)

/*
 * This check is done typically without holding the inode lock;
 * that may seem racey, but it is harmless in the context that it is used.
 * The inode cannot go inactive as long a reference is kept, and 
 * therefore if dquot(s) were attached, they'll stay consistent.
 * If, for example, the ownership of the inode changes while
 * we didnt have the inode locked, the appropriate dquot(s) will be
 * attached atomically.
 */
#define XFS_NOT_DQATTACHED(mp, ip) ((XFS_IS_UQUOTA_ON(mp) &&\
				     (ip)->i_udquot == NULL) || \
				    (XFS_IS_PQUOTA_ON(mp) && \
				     (ip)->i_pdquot == NULL))


#define XFS_MOUNT_QUOTA_ALL	(XFS_MOUNT_UDQ_ACCT|XFS_MOUNT_UDQ_ENFD|\
				 XFS_MOUNT_UDQ_CHKD|XFS_MOUNT_PDQ_ACCT|\
				 XFS_MOUNT_PDQ_ENFD|XFS_MOUNT_PDQ_CHKD)
#define XFS_MOUNT_QUOTA_MASK	(XFS_MOUNT_QUOTA_ALL | XFS_MOUNT_UDQ_ACTIVE | \
				 XFS_MOUNT_PDQ_ACTIVE)

#define XFS_PROC_PROJID(c)	  ((c)->p_arsess->as_prid)
#define XFS_IS_REALTIME_INODE(ip) ((ip)->i_d.di_flags & XFS_DIFLAG_REALTIME)


extern struct xfs_qm   *xfs_qm_init(void);
extern void 		xfs_qm_destroy(struct xfs_qm *xqm);
extern int		xfs_qm_dqflush_all(struct xfs_mount *, int);
extern int		xfs_qm_dqattach(struct xfs_inode *, uint);
extern int		xfs_qm_sysent(struct vfs *, int, int, caddr_t);
extern int		xfs_qm_dqpurge_all(struct xfs_mount *, uint);
extern void		xfs_qm_mount_quotainit(struct xfs_mount *, uint);
extern void		xfs_qm_unmount_quotadestroy(struct xfs_mount *);
extern int		xfs_qm_mount_quotas(struct xfs_mount *);
extern void 		xfs_qm_unmount_quotas(struct xfs_mount *);
extern void		xfs_qm_dqdettach_inode(struct xfs_inode *ip);
extern void 		xfs_qm_sync(struct xfs_mount *mp, short flags);
extern int		xfs_qm_check_inoquota(struct xfs_dquot *dqp);
extern int		xfs_qm_check_inoquota2(struct xfs_mount *mp,
					       struct xfs_dquot *udqp,
					       struct xfs_dquot *pdqp);

/*
 * dquot interface
 */
extern void		xfs_dqlock(struct xfs_dquot *dqp);
extern void		xfs_dqunlock(struct xfs_dquot *dqp);
extern void		xfs_dqunlock_nonotify(struct xfs_dquot *dqp);
extern void		xfs_dqlock2(struct xfs_dquot *d1,
				    struct xfs_dquot *d2);
extern void 		xfs_qm_dqput(struct xfs_dquot *dqp);
extern void 		xfs_qm_dqrele(struct xfs_dquot *dqp);
extern xfs_dqid_t	xfs_qm_dqid(struct xfs_dquot *dqp);
extern int		xfs_qm_dqget(struct xfs_mount *mp, 
				     struct xfs_inode *ip,
				      xfs_dqid_t id,
				      uint type, uint doalloc, 
				      struct xfs_dquot **O_dqpp);
extern int 		xfs_qm_dqcheck(struct xfs_disk_dquot *, 
				       xfs_dqid_t, char *);

/*
 * vnodeops stuff
 */
extern struct xfs_dquot *	xfs_qm_vop_chown(struct xfs_trans *tp, 
						 struct xfs_inode *ip, 
						 struct xfs_dquot **olddq,
						 struct xfs_dquot *newdq);
extern int		xfs_qm_vop_dqalloc(struct xfs_mount	*mp,
					   struct xfs_inode	*dp,
					   uid_t	uid,
					   xfs_prid_t	prid,
					   uint		flags,
					   struct xfs_dquot	**udqpp,
					   struct xfs_dquot	**pdqpp);

extern int		xfs_qm_vop_chown_dqalloc(struct xfs_mount	*mp,
						 struct xfs_inode	*ip,
						 int			mask,
						 uid_t			uid,
						 xfs_prid_t		prid,
						 struct xfs_dquot	**udqpp,
						 struct xfs_dquot	**pdqpp);

extern int		xfs_qm_vop_chown_reserve(struct xfs_trans	*tp,
						 struct xfs_inode	*ip,
						 struct xfs_dquot	*udqp,
						 struct xfs_dquot	*pdqp,
						 uint		privileged);

extern int		xfs_qm_vop_rename_dqattach(struct xfs_inode	**i_tab);
extern void		xfs_qm_vop_dqattach_and_dqmod_newinode(
						struct xfs_trans *tp,
						struct xfs_inode *ip,
						struct xfs_dquot *udqp,	
						struct xfs_dquot *pdqp);


/*
 * Dquot Transaction interface
 */
extern void 		xfs_trans_alloc_dqinfo(struct xfs_trans *tp);
extern void 		xfs_trans_free_dqinfo(struct xfs_trans *tp);
extern void		xfs_trans_dup_dqinfo(struct xfs_trans *otp, 
					     struct xfs_trans *ntp);
extern void		xfs_trans_mod_dquot(struct xfs_trans *tp, 
					    struct xfs_dquot *dqp,
					    uint field, long delta);
extern int		xfs_trans_mod_dquot_byino(struct xfs_trans *tp, 
						  struct xfs_inode *ip,
						  uint field, long delta);
extern void		xfs_trans_apply_dquot_deltas(struct xfs_trans *tp);
extern void		xfs_trans_unreserve_and_mod_dquots(struct xfs_trans *tp);

extern int		xfs_trans_reserve_quota(struct xfs_trans *tp,
						struct xfs_inode *ip,
						long nblks,
						uint type);


extern int		xfs_trans_reserve_quota_bydquots(struct xfs_trans *tp,
							 struct xfs_dquot *udqp,
							 struct xfs_dquot *pdqp,
							 long nblks,
							 uint flags);
extern void		xfs_trans_log_dquot(struct xfs_trans *tp, 
					    struct xfs_dquot *dqp);
extern void		xfs_trans_dqjoin(struct xfs_trans *tp, 
					 struct xfs_dquot *dqp);



/* 
 * Regular disk block quota reservations 
 */
#define 	xfs_trans_reserve_blkquota(tp, ip, nblks) \
xfs_trans_reserve_quota(tp, ip, nblks, XFS_QMOPT_RES_REGBLKS)
						  
#define 	xfs_trans_unreserve_blkquota(tp, ip, nblks) \
xfs_trans_reserve_quota(tp, ip, -nblks, XFS_QMOPT_RES_REGBLKS)

#define 	xfs_trans_reserve_blkquota_bydquots(tp, udq, pdq, nblks, f) \
xfs_trans_reserve_quota_bydquots(tp, udq, pdq, nblks, f|XFS_QMOPT_RES_REGBLKS) 

#define 	xfs_trans_unreserve_blkquota_bydquots(tp, udq, pdq, nblks, f) \
xfs_trans_reserve_quota_bydquots(tp, udq, pdq, -nblks, f|XFS_QMOPT_RES_REGBLKS)

/*
 * Realtime disk block quota reservations 
 */
#define 	xfs_trans_reserve_rtblkquota(mp, tp, ip, nblks) \
xfs_trans_reserve_quota(tp, ip, nblks, XFS_QMOPT_RES_RTBLKS)
						  
#define 	xfs_trans_unreserve_rtblkquota(tp, ip, nblks) \
xfs_trans_reserve_quota(tp, ip, -nblks, XFS_QMOPT_RES_RTBLKS)

#define 	xfs_trans_reserve_rtblkquota_bydquots(mp, tp, udq, pdq, nblks, f) \
xfs_trans_reserve_quota_bydquots(mp, tp, udq, pdq, nblks, f|XFS_QMOPT_RES_RTBLKS) 

#define 	xfs_trans_unreserve_rtblkquota_bydquots(tp, udq, pdq, nblks) \
xfs_trans_reserve_quota_bydquots(tp, udq, pdq, -nblks, XFS_QMOPT_RES_RTBLKS)

#endif