sys/ufs/ufs/ufs_quota.h
/*	$NetBSD: ufs_quota.h,v 1.2 2011/03/06 17:08:39 bouyer Exp $	*/

/*
 * Copyright (c) 1982, 1986, 1990, 1993, 1995
 *	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.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 *
 *	@(#)ufs_quota.c	8.5 (Berkeley) 5/20/95
 */
#include <ufs/ufs/quota1.h>
#include <ufs/ufs/quota2.h>

/* link to this quota in the quota inode (for QUOTA2) */
struct dq2_desc {
	uint64_t dq2_lblkno; /* logical disk block holding this quota */
	u_int    dq2_blkoff; /* offset in disk block holding this quota */
};

/*
 * 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.
 * Field markings and the corresponding locks:
 * h:	dqlock
 * d:	dq_interlock
 *
 * Lock order is: dq_interlock -> dqlock
 *                dq_interlock -> dqvp
 */
struct dquot {
	LIST_ENTRY(dquot) dq_hash;	/* h: hash list */
	u_int16_t dq_flags;		/* d: flags, see below */
	u_int16_t dq_type;		/* d: quota type of this dquot */
	u_int32_t dq_cnt;		/* h: count of active references */
	u_int32_t dq_id;		/* d: identifier this applies to */
	struct	ufsmount *dq_ump;	/* d: filesystem this is taken from */
	kmutex_t dq_interlock;		/* d: lock this dquot */
	union {
		struct dqblk dq1_dqb;	/* d: actual usage & quotas */
		struct dq2_desc dq2_desc; /* d: pointer to quota data */
	} dq_un;
};

/*
 * Flag values.
 */
#define	DQ_MOD		0x04		/* this quota modified since read */
#define	DQ_FAKE		0x08		/* no limits here, just usage */
#define	DQ_WARN(ltype)	(0x10 << ltype)	/* has been warned about "type" limit */
/*
 * Shorthand notation.
 */
#define	dq_bhardlimit	dq_un.dq1_dqb.dqb_bhardlimit
#define	dq_bsoftlimit	dq_un.dq1_dqb.dqb_bsoftlimit
#define	dq_curblocks	dq_un.dq1_dqb.dqb_curblocks
#define	dq_ihardlimit	dq_un.dq1_dqb.dqb_ihardlimit
#define	dq_isoftlimit	dq_un.dq1_dqb.dqb_isoftlimit
#define	dq_curinodes	dq_un.dq1_dqb.dqb_curinodes
#define	dq_btime	dq_un.dq1_dqb.dqb_btime
#define	dq_itime	dq_un.dq1_dqb.dqb_itime

#define dq2_lblkno	dq_un.dq2_desc.dq2_lblkno
#define dq2_blkoff	dq_un.dq2_desc.dq2_blkoff
/*
 * 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		NULL

extern kmutex_t dqlock;
extern kcondvar_t dqcv;
/*
 * Quota name to error message mapping.
 */
const char *quotatypes[MAXQUOTAS];

int  getinoquota(struct inode *);
int  dqget(struct vnode *, u_long, struct ufsmount *, int, struct dquot **);
void dqref(struct dquot *);
void dqrele(struct vnode *, struct dquot *);
void dqflush(struct vnode *);

int chkdq1(struct inode *, int64_t, kauth_cred_t, int);
int chkiq1(struct inode *, int32_t, kauth_cred_t, int);
int q1sync(struct mount *);
int dq1get(struct vnode *, u_long, struct ufsmount *, int, struct dquot *);
int dq1sync(struct vnode *, struct dquot *);
int quota1_handle_cmd_get(struct ufsmount *, int, int, int, prop_array_t);
int quota1_handle_cmd_set(struct ufsmount *, int, int, int, prop_dictionary_t);
int quota1_handle_cmd_quotaon(struct lwp *, struct ufsmount *, int,
    const char *);
int quota1_handle_cmd_quotaoff(struct lwp *, struct ufsmount *, int);

int chkdq2(struct inode *, int64_t, kauth_cred_t, int);
int chkiq2(struct inode *, int32_t, kauth_cred_t, int);
int quota2_handle_cmd_get(struct ufsmount *, int, int, int, prop_array_t);
int quota2_handle_cmd_set(struct ufsmount *, int, int, int, prop_dictionary_t);
int quota2_handle_cmd_clear(struct ufsmount *, int, int, int, prop_dictionary_t);
int quota2_handle_cmd_getall(struct ufsmount *, int, prop_array_t);
int q2sync(struct mount *);
int dq2get(struct vnode *, u_long, struct ufsmount *, int, struct dquot *);
int dq2sync(struct vnode *, struct dquot *);
