xref: /csrg-svn/sys/ufs/ffs/quota.h (revision 63376)

/*
 * Copyright (c) 1982, 1986, 1993
 *	The Regents of the University of California.  All rights reserved.
 *
 * This code is derived from software contributed to Berkeley by
 * Robert Elz at The University of Melbourne.
 *
 * %sccs.include.redist.c%
 *
 *	@(#)quota.h	8.1 (Berkeley) 06/11/93
 */

#ifndef _QUOTA_
#define _QUOTA_

/*
 * Definitions for disk quotas imposed on the average user
 * (big brother finally hits UNIX).
 *
 * The following constants define the amount of time given a user before the
 * soft limits are treated as hard limits (usually resulting in an allocation
 * failure). The timer is started when the user crosses their soft limit, it
 * is reset when they go below their soft limit.
 */
#define	MAX_IQ_TIME	(7*24*60*60)	/* 1 week */
#define	MAX_DQ_TIME	(7*24*60*60)	/* 1 week */

/*
 * The following constants define the usage of the quota file array in the
 * ufsmount structure and dquot array in the inode structure.  The semantics
 * of the elements of these arrays are defined in the routine getinoquota;
 * the remainder of the quota code treats them generically and need not be
 * inspected when changing the size of the array.
 */
#define	MAXQUOTAS	2
#define	USRQUOTA	0	/* element used for user quotas */
#define	GRPQUOTA	1	/* element used for group quotas */

/*
 * Definitions for the default names of the quotas files.
 */
#define INITQFNAMES { \
	"user",		/* USRQUOTA */ \
	"group",	/* GRPQUOTA */ \
	"undefined", \
};
#define	QUOTAFILENAME	"quota"
#define	QUOTAGROUP	"operator"

/*
 * Command definitions for the 'quotactl' system call.  The commands are
 * broken into a main command defined below and a subcommand that is used
 * to convey the type of quota that is being manipulated (see above).
 */
#define SUBCMDMASK	0x00ff
#define SUBCMDSHIFT	8
#define	QCMD(cmd, type)	(((cmd) << SUBCMDSHIFT) | ((type) & SUBCMDMASK))

#define	Q_QUOTAON	0x0100	/* enable quotas */
#define	Q_QUOTAOFF	0x0200	/* disable quotas */
#define	Q_GETQUOTA	0x0300	/* get limits and usage */
#define	Q_SETQUOTA	0x0400	/* set limits and usage */
#define	Q_SETUSE	0x0500	/* set usage */
#define	Q_SYNC		0x0600	/* sync disk copy of a filesystems quotas */

/*
 * The following structure defines the format of the disk quota file
 * (as it appears on disk) - the file is an array of these structures
 * indexed by user or group number.  The setquota system call establishes
 * the vnode for each quota file (a pointer is retained in the ufsmount
 * structure).
 */
struct	dqblk {
	u_long	dqb_bhardlimit;	/* absolute limit on disk blks alloc */
	u_long	dqb_bsoftlimit;	/* preferred limit on disk blks */
	u_long	dqb_curblocks;	/* current block count */
	u_long	dqb_ihardlimit;	/* maximum # allocated inodes + 1 */
	u_long	dqb_isoftlimit;	/* preferred inode limit */
	u_long	dqb_curinodes;	/* current # allocated inodes */
	time_t	dqb_btime;	/* time limit for excessive disk use */
	time_t	dqb_itime;	/* time limit for excessive files */
};

/*
 * The following structure records disk usage for a user or group on a
 * filesystem. There is one allocated for each quota that exists on any
 * filesystem for the current user or group. A cache is kept of recently
 * used entries.
 */
struct	dquot {
	struct	dquot *dq_forw, **dq_back; /* hash list */
	struct	dquot *dq_freef, **dq_freeb; /* free list */
	short	dq_flags;		/* flags, see below */
	short	dq_cnt;			/* count of active references */
	short	dq_spare;		/* unused spare padding */
	short	dq_type;		/* quota type of this dquot */
	u_long	dq_id;			/* identifier this applies to */
	struct	ufsmount *dq_ump;	/* filesystem that this is taken from */
	struct	dqblk dq_dqb;		/* actual usage & quotas */
};
/*
 * Flag values.
 */
#define	DQ_LOCK		0x01		/* this quota locked (no MODS) */
#define	DQ_WANT		0x02		/* wakeup on unlock */
#define	DQ_MOD		0x04		/* this quota modified since read */
#define	DQ_FAKE		0x08		/* no limits here, just usage */
#define	DQ_BLKS		0x10		/* has been warned about blk limit */
#define	DQ_INODS	0x20		/* has been warned about inode limit */
/*
 * Shorthand notation.
 */
#define	dq_bhardlimit	dq_dqb.dqb_bhardlimit
#define	dq_bsoftlimit	dq_dqb.dqb_bsoftlimit
#define	dq_curblocks	dq_dqb.dqb_curblocks
#define	dq_ihardlimit	dq_dqb.dqb_ihardlimit
#define	dq_isoftlimit	dq_dqb.dqb_isoftlimit
#define	dq_curinodes	dq_dqb.dqb_curinodes
#define	dq_btime	dq_dqb.dqb_btime
#define	dq_itime	dq_dqb.dqb_itime

/*
 * If the system has never checked for a quota for this file, then it is set
 * to NODQUOT.  Once a write attempt is made the inode pointer is set to
 * reference a dquot structure.
 */
#define	NODQUOT		((struct dquot *) 0)

/*
 * Flags to chkdq() and chkiq()
 */
#define	FORCE	0x01	/* force usage changes independent of limits */
#define	CHOWN	0x02	/* (advisory) change initiated by chown */

/*
 * Macros to avoid subroutine calls to trivial functions.
 */
#ifdef DIAGNOSTIC
#define	DQREF(dq)	dqref(dq)
#else
#define	DQREF(dq)	(dq)->dq_cnt++
#endif

#include <sys/cdefs.h>

struct dquot;
struct inode;
struct mount;
struct proc;
struct ucred;
struct ufsmount;
struct vnode;
__BEGIN_DECLS
int	chkdq __P((struct inode *, long, struct ucred *, int));
int	chkdqchg __P((struct inode *, long, struct ucred *, int));
int	chkiq __P((struct inode *, long, struct ucred *, int));
int	chkiqchg __P((struct inode *, long, struct ucred *, int));
void	dqflush __P((struct vnode *));
int	dqget __P((struct vnode *,
	    u_long, struct ufsmount *, int, struct dquot **));
void	dqinit __P((void));
void	dqref __P((struct dquot *));
void	dqrele __P((struct vnode *, struct dquot *));
int	dqsync __P((struct vnode *, struct dquot *));
int	getinoquota __P((struct inode *));
int	getquota __P((struct mount *, u_long, int, caddr_t));
int	qsync __P((struct mount *mp));
int	quotaoff __P((struct proc *, struct mount *, int));
int	quotaon __P((struct proc *, struct mount *, int, caddr_t));
int	setquota __P((struct mount *, u_long, int, caddr_t));
int	setuse __P((struct mount *, u_long, int, caddr_t));
int	ufs_quotactl __P((struct mount *, int, uid_t, caddr_t, struct proc *));
__END_DECLS

#ifdef DIAGNOSTIC
__BEGIN_DECLS
void	chkdquot __P((struct inode *));
__END_DECLS
#endif

#endif /* _QUOTA_ */