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File: [cvs.NetBSD.org] / src / sys / ufs / ufs / ufs_quota.c (download)

Revision 1.117, Sat Jun 28 22:27:51 2014 UTC (6 years, 9 months ago) by dholland
Branch: MAIN
CVS Tags: tls-maxphys-base-20171202, tls-maxphys-base, tls-earlyentropy-base, thorpej-futex-base, thorpej-futex, thorpej-cfargs-base, thorpej-cfargs, prg-localcount2-base3, prg-localcount2-base2, prg-localcount2-base1, prg-localcount2-base, prg-localcount2, phil-wifi-base, phil-wifi-20200421, phil-wifi-20200411, phil-wifi-20200406, phil-wifi-20191119, phil-wifi-20190609, phil-wifi, pgoyette-localcount-base, pgoyette-localcount-20170426, pgoyette-localcount-20170320, pgoyette-localcount-20170107, pgoyette-localcount-20161104, pgoyette-localcount-20160806, pgoyette-localcount-20160726, pgoyette-localcount, pgoyette-compat-merge-20190127, pgoyette-compat-base, pgoyette-compat-20190127, pgoyette-compat-20190118, pgoyette-compat-1226, pgoyette-compat-1126, pgoyette-compat-1020, pgoyette-compat-0930, pgoyette-compat-0906, pgoyette-compat-0728, pgoyette-compat-0625, pgoyette-compat-0521, pgoyette-compat-0502, pgoyette-compat-0422, pgoyette-compat-0415, pgoyette-compat-0407, pgoyette-compat-0330, pgoyette-compat-0322, pgoyette-compat-0315, pgoyette-compat, perseant-stdc-iso10646-base, perseant-stdc-iso10646, nick-nhusb-base-20170825, nick-nhusb-base-20170204, nick-nhusb-base-20161204, nick-nhusb-base-20161004, nick-nhusb-base-20160907, nick-nhusb-base-20160529, nick-nhusb-base-20160422, nick-nhusb-base-20160319, nick-nhusb-base-20151226, nick-nhusb-base-20150921, nick-nhusb-base-20150606, nick-nhusb-base-20150406, nick-nhusb-base, nick-nhusb, netbsd-9-base, netbsd-9-1-RELEASE, netbsd-9-0-RELEASE, netbsd-9-0-RC2, netbsd-9-0-RC1, netbsd-9, netbsd-8-base, netbsd-8-2-RELEASE, netbsd-8-1-RELEASE, netbsd-8-1-RC1, netbsd-8-0-RELEASE, netbsd-8-0-RC2, netbsd-8-0-RC1, netbsd-8, netbsd-7-nhusb-base-20170116, netbsd-7-nhusb-base, netbsd-7-nhusb, netbsd-7-base, netbsd-7-2-RELEASE, netbsd-7-1-RELEASE, netbsd-7-1-RC2, netbsd-7-1-RC1, netbsd-7-1-2-RELEASE, netbsd-7-1-1-RELEASE, netbsd-7-1, netbsd-7-0-RELEASE, netbsd-7-0-RC3, netbsd-7-0-RC2, netbsd-7-0-RC1, netbsd-7-0-2-RELEASE, netbsd-7-0-1-RELEASE, netbsd-7-0, netbsd-7, matt-nb8-mediatek-base, matt-nb8-mediatek, localcount-20160914, jdolecek-ncq-base, jdolecek-ncq, isaki-audio2-base, isaki-audio2, is-mlppp-base, is-mlppp, bouyer-xenpvh-base2, bouyer-xenpvh-base1, bouyer-xenpvh-base, bouyer-xenpvh, bouyer-socketcan-base1, bouyer-socketcan-base, bouyer-socketcan, ad-namecache-base3, ad-namecache-base2, ad-namecache-base1, ad-namecache-base, ad-namecache, HEAD
Changes since 1.116: +9 -9 lines

Revert the following changes:

   src/sys/sys/quotactl.h 1.37
   src/sys/compat/netbsd32/netbsd32.h 1.101
   src/sys/compat/netbsd32/netbsd32_netbsd.c 1.188, 1.189
   src/sys/kern/vfs_quotactl.c 1.39
   src/sys/kern/vfs_syscalls.c 1.483
   src/sys/ufs/lfs/ulfs_quota.c 1.11
   src/sys/ufs/ufs/ufs_quota.c 1.116
   src/lib/libquota/quota_kernel.c 1.5

and do them correctly.

If you're going to change the name of something, you need to change
the name of *all* the things with the same name, not just a handful,
and you should change it to something similar so it still matches the
rest of the system rather than just picking an arbitrarily different
name.

Hi, Joerg.

To wit, rename the quotactl "delete" operation to "del", because
"delete" is a reserved word in C++ and for some reason Joerg wants to
run internal interfaces used only by C code through his C++ compiler.
Do not rename it to "remove" instead, because this doesn't match
libquota or the rest of the usage throughout the system; and rename
all the related identifiers, not just the ones that blew the mind of
Joerg's C++ compiler.

Because this is not a user-facing API (the only userland consumer
sys/quotactl.h is libquota) it is sort of ok to make arbitrary
source-incompatible changes; however, by the same token it's completely
unnecessary. If it *were* a user-facing API that someone might have a
semi-rational reason to want to run a C++ compiler on, it would be
incorrect to change it at this point.

/*	$NetBSD: ufs_quota.c,v 1.117 2014/06/28 22:27:51 dholland 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 <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: ufs_quota.c,v 1.117 2014/06/28 22:27:51 dholland Exp $");

#if defined(_KERNEL_OPT)
#include "opt_quota.h"
#endif 
#include <sys/param.h>
#include <sys/kernel.h>
#include <sys/systm.h>
#include <sys/namei.h>
#include <sys/file.h>
#include <sys/proc.h>
#include <sys/vnode.h>
#include <sys/mount.h>
#include <sys/kauth.h>

#include <sys/quotactl.h>
#include <ufs/ufs/quota.h>
#include <ufs/ufs/inode.h>
#include <ufs/ufs/ufsmount.h>
#include <ufs/ufs/ufs_extern.h>
#include <ufs/ufs/ufs_quota.h>

kmutex_t dqlock;
kcondvar_t dqcv;
const char *quotatypes[MAXQUOTAS] = INITQFNAMES;

/*
 * Code pertaining to management of the in-core dquot data structures.
 */
#define DQHASH(dqvp, id) \
	(((((long)(dqvp)) >> 8) + id) & dqhash)
static LIST_HEAD(dqhashhead, dquot) *dqhashtbl;
static u_long dqhash;
static pool_cache_t dquot_cache;


static int quota_handle_cmd_stat(struct mount *, struct lwp *,
    struct quotactl_args *args);
static int quota_handle_cmd_idtypestat(struct mount *, struct lwp *,
    struct quotactl_args *args);
static int quota_handle_cmd_objtypestat(struct mount *, struct lwp *,
    struct quotactl_args *args);
static int quota_handle_cmd_get(struct mount *, struct lwp *,
    struct quotactl_args *args);
static int quota_handle_cmd_put(struct mount *, struct lwp *,
    struct quotactl_args *args);
static int quota_handle_cmd_cursorget(struct mount *, struct lwp *,
    struct quotactl_args *args);
static int quota_handle_cmd_del(struct mount *, struct lwp *,
    struct quotactl_args *args);
static int quota_handle_cmd_quotaon(struct mount *, struct lwp *, 
    struct quotactl_args *args);
static int quota_handle_cmd_quotaoff(struct mount *, struct lwp *, 
    struct quotactl_args *args);
static int quota_handle_cmd_cursoropen(struct mount *, struct lwp *,
    struct quotactl_args *args);
static int quota_handle_cmd_cursorclose(struct mount *, struct lwp *,
    struct quotactl_args *args);
static int quota_handle_cmd_cursorskipidtype(struct mount *, struct lwp *,
    struct quotactl_args *args);
static int quota_handle_cmd_cursoratend(struct mount *, struct lwp *,
    struct quotactl_args *args);
static int quota_handle_cmd_cursorrewind(struct mount *, struct lwp *,
    struct quotactl_args *args);

/*
 * Initialize the quota fields of an inode.
 */
void
ufsquota_init(struct inode *ip)
{
	int i;

	for (i = 0; i < MAXQUOTAS; i++)
		ip->i_dquot[i] = NODQUOT;
}

/*
 * Release the quota fields from an inode.
 */
void
ufsquota_free(struct inode *ip)
{
	int i;

	for (i = 0; i < MAXQUOTAS; i++) {
		dqrele(ITOV(ip), ip->i_dquot[i]);
		ip->i_dquot[i] = NODQUOT;
	}
}

/*
 * Update disk usage, and take corrective action.
 */
int
chkdq(struct inode *ip, int64_t change, kauth_cred_t cred, int flags)
{
	/* do not track snapshot usage, or we will deadlock */
	if ((ip->i_flags & SF_SNAPSHOT) != 0)
		return 0;

#ifdef QUOTA
	if (ip->i_ump->um_flags & UFS_QUOTA)
		return chkdq1(ip, change, cred, flags);
#endif
#ifdef QUOTA2
	if (ip->i_ump->um_flags & UFS_QUOTA2)
		return chkdq2(ip, change, cred, flags);
#endif
	return 0;
}

/*
 * Check the inode limit, applying corrective action.
 */
int
chkiq(struct inode *ip, int32_t change, kauth_cred_t cred, int flags)
{
	/* do not track snapshot usage, or we will deadlock */
	if ((ip->i_flags & SF_SNAPSHOT) != 0)
		return 0;
#ifdef QUOTA
	if (ip->i_ump->um_flags & UFS_QUOTA)
		return chkiq1(ip, change, cred, flags);
#endif
#ifdef QUOTA2
	if (ip->i_ump->um_flags & UFS_QUOTA2)
		return chkiq2(ip, change, cred, flags);
#endif
	return 0;
}

int
quota_handle_cmd(struct mount *mp, struct lwp *l,
		 struct quotactl_args *args)
{
	int error = 0;

	switch (args->qc_op) {
	    case QUOTACTL_STAT:
		error = quota_handle_cmd_stat(mp, l, args);
		break;
	    case QUOTACTL_IDTYPESTAT:
		error = quota_handle_cmd_idtypestat(mp, l, args);
		break;
	    case QUOTACTL_OBJTYPESTAT:
		error = quota_handle_cmd_objtypestat(mp, l, args);
		break;
	    case QUOTACTL_QUOTAON:
		error = quota_handle_cmd_quotaon(mp, l, args);
		break;
	    case QUOTACTL_QUOTAOFF:
		error = quota_handle_cmd_quotaoff(mp, l, args);
		break;
	    case QUOTACTL_GET:
		error = quota_handle_cmd_get(mp, l, args);
		break;
	    case QUOTACTL_PUT:
		error = quota_handle_cmd_put(mp, l, args);
		break;
	    case QUOTACTL_CURSORGET:
		error = quota_handle_cmd_cursorget(mp, l, args);
		break;
	    case QUOTACTL_DEL:
		error = quota_handle_cmd_del(mp, l, args);
		break;
	    case QUOTACTL_CURSOROPEN:
		error = quota_handle_cmd_cursoropen(mp, l, args);
		break;
	    case QUOTACTL_CURSORCLOSE:
		error = quota_handle_cmd_cursorclose(mp, l, args);
		break;
	    case QUOTACTL_CURSORSKIPIDTYPE:
		error = quota_handle_cmd_cursorskipidtype(mp, l, args);
		break;
	    case QUOTACTL_CURSORATEND:
		error = quota_handle_cmd_cursoratend(mp, l, args);
		break;
	    case QUOTACTL_CURSORREWIND:
		error = quota_handle_cmd_cursorrewind(mp, l, args);
		break;
	    default:
		panic("Invalid quotactl operation %d\n", args->qc_op);
	}

	return error;
}

static int 
quota_handle_cmd_stat(struct mount *mp, struct lwp *l, 
    struct quotactl_args *args)
{
	struct ufsmount *ump = VFSTOUFS(mp);
	struct quotastat *info;

	KASSERT(args->qc_op == QUOTACTL_STAT);
	info = args->u.stat.qc_info;

	if ((ump->um_flags & (UFS_QUOTA|UFS_QUOTA2)) == 0)
		return EOPNOTSUPP;

#ifdef QUOTA
	if (ump->um_flags & UFS_QUOTA) {
		strcpy(info->qs_implname, "ufs/ffs quota v1");
		info->qs_numidtypes = MAXQUOTAS;
		/* XXX no define for this */
		info->qs_numobjtypes = 2;
		info->qs_restrictions = 0;
		info->qs_restrictions |= QUOTA_RESTRICT_NEEDSQUOTACHECK;
		info->qs_restrictions |= QUOTA_RESTRICT_UNIFORMGRACE;
		info->qs_restrictions |= QUOTA_RESTRICT_32BIT;
	} else
#endif
#ifdef QUOTA2
	if (ump->um_flags & UFS_QUOTA2) {
		strcpy(info->qs_implname, "ufs/ffs quota v2");
		info->qs_numidtypes = MAXQUOTAS;
		info->qs_numobjtypes = N_QL;
		info->qs_restrictions = 0;
	} else
#endif
		return EOPNOTSUPP;

	return 0;
}

static int 
quota_handle_cmd_idtypestat(struct mount *mp, struct lwp *l, 
    struct quotactl_args *args)
{
	struct ufsmount *ump = VFSTOUFS(mp);
	int idtype;
	struct quotaidtypestat *info;
	const char *name;

	KASSERT(args->qc_op == QUOTACTL_IDTYPESTAT);
	idtype = args->u.idtypestat.qc_idtype;
	info = args->u.idtypestat.qc_info;

	if ((ump->um_flags & (UFS_QUOTA|UFS_QUOTA2)) == 0)
		return EOPNOTSUPP;

	/*
	 * These are the same for both QUOTA and QUOTA2.
	 */
	switch (idtype) {
	    case QUOTA_IDTYPE_USER:
		name = "user";
		break;
	    case QUOTA_IDTYPE_GROUP:
		name = "group";
		break;
	    default:
		return EINVAL;
	}
	strlcpy(info->qis_name, name, sizeof(info->qis_name));
	return 0;
}

static int 
quota_handle_cmd_objtypestat(struct mount *mp, struct lwp *l, 
    struct quotactl_args *args)
{
	struct ufsmount *ump = VFSTOUFS(mp);
	int objtype;
	struct quotaobjtypestat *info;
	const char *name;
	int isbytes;

	KASSERT(args->qc_op == QUOTACTL_OBJTYPESTAT);
	objtype = args->u.objtypestat.qc_objtype;
	info = args->u.objtypestat.qc_info;

	if ((ump->um_flags & (UFS_QUOTA|UFS_QUOTA2)) == 0)
		return EOPNOTSUPP;

	/*
	 * These are the same for both QUOTA and QUOTA2.
	 */
	switch (objtype) {
	    case QUOTA_OBJTYPE_BLOCKS:
		name = "block";
		isbytes = 1;
		break;
	    case QUOTA_OBJTYPE_FILES:
		name = "file";
		isbytes = 0;
		break;
	    default:
		return EINVAL;
	}
	strlcpy(info->qos_name, name, sizeof(info->qos_name));
	info->qos_isbytes = isbytes;
	return 0;
}

/* XXX shouldn't all this be in kauth ? */
static int
quota_get_auth(struct mount *mp, struct lwp *l, uid_t id) {
	/* The user can always query about his own quota. */
	if (id == kauth_cred_geteuid(l->l_cred))
		return 0;
	return kauth_authorize_system(l->l_cred, KAUTH_SYSTEM_FS_QUOTA,
	    KAUTH_REQ_SYSTEM_FS_QUOTA_GET, mp, KAUTH_ARG(id), NULL);
}

static int 
quota_handle_cmd_get(struct mount *mp, struct lwp *l, 
    struct quotactl_args *args)
{
	struct ufsmount *ump = VFSTOUFS(mp);
	int error;
	const struct quotakey *qk;
	struct quotaval *qv;

	KASSERT(args->qc_op == QUOTACTL_GET);
	qk = args->u.get.qc_key;
	qv = args->u.get.qc_val;

	if ((ump->um_flags & (UFS_QUOTA|UFS_QUOTA2)) == 0)
		return EOPNOTSUPP;
	
	error = quota_get_auth(mp, l, qk->qk_id);
	if (error != 0) 
		return error;
#ifdef QUOTA
	if (ump->um_flags & UFS_QUOTA) {
		error = quota1_handle_cmd_get(ump, qk, qv);
	} else
#endif
#ifdef QUOTA2
	if (ump->um_flags & UFS_QUOTA2) {
		error = quota2_handle_cmd_get(ump, qk, qv);
	} else
#endif
		panic("quota_handle_cmd_get: no support ?");
		
	if (error != 0)
		return error;

	return error;
}

static int 
quota_handle_cmd_put(struct mount *mp, struct lwp *l, 
    struct quotactl_args *args)
{
	struct ufsmount *ump = VFSTOUFS(mp);
	const struct quotakey *qk;
	const struct quotaval *qv;
	id_t kauth_id;
	int error;

	KASSERT(args->qc_op == QUOTACTL_PUT);
	qk = args->u.put.qc_key;
	qv = args->u.put.qc_val;

	if ((ump->um_flags & (UFS_QUOTA|UFS_QUOTA2)) == 0)
		return EOPNOTSUPP;

	kauth_id = qk->qk_id;
	if (kauth_id == QUOTA_DEFAULTID) {
		kauth_id = 0;
	}

	error = kauth_authorize_system(l->l_cred, KAUTH_SYSTEM_FS_QUOTA,
	    KAUTH_REQ_SYSTEM_FS_QUOTA_MANAGE, mp, KAUTH_ARG(kauth_id),
	    NULL);
	if (error != 0) {
		return error;
	}

#ifdef QUOTA
	if (ump->um_flags & UFS_QUOTA)
		error = quota1_handle_cmd_put(ump, qk, qv);
	else
#endif
#ifdef QUOTA2
	if (ump->um_flags & UFS_QUOTA2) {
		error = quota2_handle_cmd_put(ump, qk, qv);
	} else
#endif
		panic("quota_handle_cmd_get: no support ?");
		
	if (error == ENOENT) {
		error = 0;
	}

	return error;
}

static int 
quota_handle_cmd_del(struct mount *mp, struct lwp *l, 
    struct quotactl_args *args)
{
	struct ufsmount *ump = VFSTOUFS(mp);
	const struct quotakey *qk;
	id_t kauth_id;
	int error;

	KASSERT(args->qc_op == QUOTACTL_DEL);
	qk = args->u.del.qc_key;

	kauth_id = qk->qk_id;
	if (kauth_id == QUOTA_DEFAULTID) {
		kauth_id = 0;
	}

	if ((ump->um_flags & UFS_QUOTA2) == 0)
		return EOPNOTSUPP;

	/* avoid whitespace changes */
	{
		error = kauth_authorize_system(l->l_cred, KAUTH_SYSTEM_FS_QUOTA,
		    KAUTH_REQ_SYSTEM_FS_QUOTA_MANAGE, mp, KAUTH_ARG(kauth_id),
		    NULL);
		if (error != 0)
			goto err;
#ifdef QUOTA2
		if (ump->um_flags & UFS_QUOTA2) {
			error = quota2_handle_cmd_del(ump, qk);
		} else
#endif
			panic("quota_handle_cmd_get: no support ?");
		
		if (error && error != ENOENT)
			goto err;
	}

	return 0;
 err:
	return error;
}

static int 
quota_handle_cmd_cursorget(struct mount *mp, struct lwp *l, 
    struct quotactl_args *args)
{
	struct ufsmount *ump = VFSTOUFS(mp);
	int error;

	KASSERT(args->qc_op == QUOTACTL_CURSORGET);

	if ((ump->um_flags & UFS_QUOTA2) == 0)
		return EOPNOTSUPP;
	
	error = kauth_authorize_system(l->l_cred, KAUTH_SYSTEM_FS_QUOTA,
	    KAUTH_REQ_SYSTEM_FS_QUOTA_GET, mp, NULL, NULL);
	if (error)
		return error;
		
#ifdef QUOTA2
	if (ump->um_flags & UFS_QUOTA2) {
		struct quotakcursor *cursor = args->u.cursorget.qc_cursor;
		struct quotakey *keys = args->u.cursorget.qc_keys;
		struct quotaval *vals = args->u.cursorget.qc_vals;
		unsigned maxnum = args->u.cursorget.qc_maxnum;
		unsigned *ret = args->u.cursorget.qc_ret;

		error = quota2_handle_cmd_cursorget(ump, cursor, keys, vals,
						    maxnum, ret);
	} else
#endif
		panic("quota_handle_cmd_cursorget: no support ?");

	return error;
}

static int 
quota_handle_cmd_cursoropen(struct mount *mp, struct lwp *l, 
    struct quotactl_args *args)
{
#ifdef QUOTA2
	struct ufsmount *ump = VFSTOUFS(mp);
	struct quotakcursor *cursor = args->u.cursoropen.qc_cursor;
#endif
	int error;

	KASSERT(args->qc_op == QUOTACTL_CURSOROPEN);

	error = kauth_authorize_system(l->l_cred, KAUTH_SYSTEM_FS_QUOTA,
	    KAUTH_REQ_SYSTEM_FS_QUOTA_GET, mp, NULL, NULL);
	if (error)
		return error;

#ifdef QUOTA2
	if (ump->um_flags & UFS_QUOTA2) {
		error = quota2_handle_cmd_cursoropen(ump, cursor);
	} else
#endif
		error = EOPNOTSUPP;

	return error;
}

static int 
quota_handle_cmd_cursorclose(struct mount *mp, struct lwp *l, 
    struct quotactl_args *args)
{
#ifdef QUOTA2
	struct ufsmount *ump = VFSTOUFS(mp);
	struct quotakcursor *cursor = args->u.cursorclose.qc_cursor;
#endif
	int error;

	KASSERT(args->qc_op == QUOTACTL_CURSORCLOSE);

	error = kauth_authorize_system(l->l_cred, KAUTH_SYSTEM_FS_QUOTA,
	    KAUTH_REQ_SYSTEM_FS_QUOTA_GET, mp, NULL, NULL);
	if (error)
		return error;

#ifdef QUOTA2
	if (ump->um_flags & UFS_QUOTA2) {
		error = quota2_handle_cmd_cursorclose(ump, cursor);
	} else
#endif
		error = EOPNOTSUPP;

	return error;
}

static int 
quota_handle_cmd_cursorskipidtype(struct mount *mp, struct lwp *l, 
    struct quotactl_args *args)
{
#ifdef QUOTA2
	struct ufsmount *ump = VFSTOUFS(mp);
	struct quotakcursor *cursor = args->u.cursorskipidtype.qc_cursor;
	int idtype = args->u.cursorskipidtype.qc_idtype;
#endif
	int error;

	KASSERT(args->qc_op == QUOTACTL_CURSORSKIPIDTYPE);

#ifdef QUOTA2
	if (ump->um_flags & UFS_QUOTA2) {
		error = quota2_handle_cmd_cursorskipidtype(ump, cursor, idtype);
	} else
#endif
		error = EOPNOTSUPP;

	return error;
}

static int 
quota_handle_cmd_cursoratend(struct mount *mp, struct lwp *l, 
    struct quotactl_args *args)
{
#ifdef QUOTA2
	struct ufsmount *ump = VFSTOUFS(mp);
	struct quotakcursor *cursor = args->u.cursoratend.qc_cursor;
	unsigned *ret = args->u.cursoratend.qc_ret;
#endif
	int error;

	KASSERT(args->qc_op == QUOTACTL_CURSORATEND);

#ifdef QUOTA2
	if (ump->um_flags & UFS_QUOTA2) {
		error = quota2_handle_cmd_cursoratend(ump, cursor, ret);
	} else
#endif
		error = EOPNOTSUPP;

	return error;
}

static int 
quota_handle_cmd_cursorrewind(struct mount *mp, struct lwp *l, 
    struct quotactl_args *args)
{
#ifdef QUOTA2
	struct ufsmount *ump = VFSTOUFS(mp);
	struct quotakcursor *cursor = args->u.cursorrewind.qc_cursor;
#endif
	int error;

	KASSERT(args->qc_op == QUOTACTL_CURSORREWIND);

#ifdef QUOTA2
	if (ump->um_flags & UFS_QUOTA2) {
		error = quota2_handle_cmd_cursorrewind(ump, cursor);
	} else
#endif
		error = EOPNOTSUPP;

	return error;
}

static int 
quota_handle_cmd_quotaon(struct mount *mp, struct lwp *l, 
    struct quotactl_args *args)
{
	struct ufsmount *ump = VFSTOUFS(mp);
	int error;

	KASSERT(args->qc_op == QUOTACTL_QUOTAON);

	if ((ump->um_flags & UFS_QUOTA2) != 0)
		return EBUSY;
	
	error = kauth_authorize_system(l->l_cred, KAUTH_SYSTEM_FS_QUOTA,
	    KAUTH_REQ_SYSTEM_FS_QUOTA_ONOFF, mp, NULL, NULL);
	if (error != 0) {
		return error;
	}
#ifdef QUOTA
	int idtype = args->u.quotaon.qc_idtype;
	const char *qfile = args->u.quotaon.qc_quotafile;
	error = quota1_handle_cmd_quotaon(l, ump, idtype, qfile);
#else
	error = EOPNOTSUPP;
#endif
	
	return error;
}

static int 
quota_handle_cmd_quotaoff(struct mount *mp, struct lwp *l, 
    struct quotactl_args *args)
{
	struct ufsmount *ump = VFSTOUFS(mp);
	int error;

	KASSERT(args->qc_op == QUOTACTL_QUOTAOFF);

	if ((ump->um_flags & UFS_QUOTA2) != 0)
		return EOPNOTSUPP;
	
	error = kauth_authorize_system(l->l_cred, KAUTH_SYSTEM_FS_QUOTA,
	    KAUTH_REQ_SYSTEM_FS_QUOTA_ONOFF, mp, NULL, NULL);
	if (error != 0) {
		return error;
	}
#ifdef QUOTA
	int idtype = args->u.quotaoff.qc_idtype;
	error = quota1_handle_cmd_quotaoff(l, ump, idtype);
#else
	error = EOPNOTSUPP;
#endif
	
	return error;
}

/*
 * Initialize the quota system.
 */
void
dqinit(void)
{

	mutex_init(&dqlock, MUTEX_DEFAULT, IPL_NONE);
	cv_init(&dqcv, "quota");
	dqhashtbl = hashinit(desiredvnodes, HASH_LIST, true, &dqhash);
	dquot_cache = pool_cache_init(sizeof(struct dquot), 0, 0, 0, "ufsdq",
	    NULL, IPL_NONE, NULL, NULL, NULL);
}

void
dqreinit(void)
{
	struct dquot *dq;
	struct dqhashhead *oldhash, *hash;
	struct vnode *dqvp;
	u_long oldmask, mask, hashval;
	int i;

	hash = hashinit(desiredvnodes, HASH_LIST, true, &mask);
	mutex_enter(&dqlock);
	oldhash = dqhashtbl;
	oldmask = dqhash;
	dqhashtbl = hash;
	dqhash = mask;
	for (i = 0; i <= oldmask; i++) {
		while ((dq = LIST_FIRST(&oldhash[i])) != NULL) {
			dqvp = dq->dq_ump->um_quotas[dq->dq_type];
			LIST_REMOVE(dq, dq_hash);
			hashval = DQHASH(dqvp, dq->dq_id);
			LIST_INSERT_HEAD(&dqhashtbl[hashval], dq, dq_hash);
		}
	}
	mutex_exit(&dqlock);
	hashdone(oldhash, HASH_LIST, oldmask);
}

/*
 * Free resources held by quota system.
 */
void
dqdone(void)
{

	pool_cache_destroy(dquot_cache);
	hashdone(dqhashtbl, HASH_LIST, dqhash);
	cv_destroy(&dqcv);
	mutex_destroy(&dqlock);
}

/*
 * Set up the quotas for an inode.
 *
 * This routine completely defines the semantics of quotas.
 * If other criterion want to be used to establish quotas, the
 * MAXQUOTAS value in quotas.h should be increased, and the
 * additional dquots set up here.
 */
int
getinoquota(struct inode *ip)
{
	struct ufsmount *ump = ip->i_ump;
	struct vnode *vp = ITOV(ip);
	int i, error;
	u_int32_t ino_ids[MAXQUOTAS];

	/*
	 * To avoid deadlocks never update quotas for quota files
	 * on the same file system
	 */
	for (i = 0; i < MAXQUOTAS; i++)
		if (vp == ump->um_quotas[i])
			return 0;

	ino_ids[USRQUOTA] = ip->i_uid;
	ino_ids[GRPQUOTA] = ip->i_gid;
	for (i = 0; i < MAXQUOTAS; i++) {
		/*
		 * If the file id changed the quota needs update.
		 */
		if (ip->i_dquot[i] != NODQUOT &&
		    ip->i_dquot[i]->dq_id != ino_ids[i]) {
			dqrele(ITOV(ip), ip->i_dquot[i]);
			ip->i_dquot[i] = NODQUOT;
		}
		/*
		 * Set up the quota based on file id.
		 * ENODEV means that quotas are not enabled.
		 */
		if (ip->i_dquot[i] == NODQUOT &&
		    (error = dqget(vp, ino_ids[i], ump, i, &ip->i_dquot[i])) &&
		    error != ENODEV)
			return (error);
	}
	return 0;
}

/*
 * Obtain a dquot structure for the specified identifier and quota file
 * reading the information from the file if necessary.
 */
int
dqget(struct vnode *vp, u_long id, struct ufsmount *ump, int type,
    struct dquot **dqp)
{
	struct dquot *dq, *ndq;
	struct dqhashhead *dqh;
	struct vnode *dqvp;
	int error = 0; /* XXX gcc */

	/* Lock to see an up to date value for QTF_CLOSING. */
	mutex_enter(&dqlock);
	if ((ump->um_flags & (UFS_QUOTA|UFS_QUOTA2)) == 0) {
		mutex_exit(&dqlock);
		*dqp = NODQUOT;
		return (ENODEV);
	}
	dqvp = ump->um_quotas[type];
#ifdef QUOTA
	if (ump->um_flags & UFS_QUOTA) {
		if (dqvp == NULLVP || (ump->umq1_qflags[type] & QTF_CLOSING)) {
			mutex_exit(&dqlock);
			*dqp = NODQUOT;
			return (ENODEV);
		}
	}
#endif
#ifdef QUOTA2
	if (ump->um_flags & UFS_QUOTA2) {
		if (dqvp == NULLVP) {
			mutex_exit(&dqlock);
			*dqp = NODQUOT;
			return (ENODEV);
		}
	}
#endif
	KASSERT(dqvp != vp);
	/*
	 * Check the cache first.
	 */
	dqh = &dqhashtbl[DQHASH(dqvp, id)];
	LIST_FOREACH(dq, dqh, dq_hash) {
		if (dq->dq_id != id ||
		    dq->dq_ump->um_quotas[dq->dq_type] != dqvp)
			continue;
		KASSERT(dq->dq_cnt > 0);
		dqref(dq);
		mutex_exit(&dqlock);
		*dqp = dq;
		return (0);
	}
	/*
	 * Not in cache, allocate a new one.
	 */
	mutex_exit(&dqlock);
	ndq = pool_cache_get(dquot_cache, PR_WAITOK);
	/*
	 * Initialize the contents of the dquot structure.
	 */
	memset((char *)ndq, 0, sizeof *ndq);
	ndq->dq_flags = 0;
	ndq->dq_id = id;
	ndq->dq_ump = ump;
	ndq->dq_type = type;
	mutex_init(&ndq->dq_interlock, MUTEX_DEFAULT, IPL_NONE);
	mutex_enter(&dqlock);
	dqh = &dqhashtbl[DQHASH(dqvp, id)];
	LIST_FOREACH(dq, dqh, dq_hash) {
		if (dq->dq_id != id ||
		    dq->dq_ump->um_quotas[dq->dq_type] != dqvp)
			continue;
		/*
		 * Another thread beat us allocating this dquot.
		 */
		KASSERT(dq->dq_cnt > 0);
		dqref(dq);
		mutex_exit(&dqlock);
		mutex_destroy(&ndq->dq_interlock);
		pool_cache_put(dquot_cache, ndq);
		*dqp = dq;
		return 0;
	}
	dq = ndq;
	LIST_INSERT_HEAD(dqh, dq, dq_hash);
	dqref(dq);
	mutex_enter(&dq->dq_interlock);
	mutex_exit(&dqlock);
#ifdef QUOTA
	if (ump->um_flags & UFS_QUOTA)
		error = dq1get(dqvp, id, ump, type, dq);
#endif
#ifdef QUOTA2
	if (ump->um_flags & UFS_QUOTA2)
		error = dq2get(dqvp, id, ump, type, dq);
#endif
	/*
	 * I/O error in reading quota file, release
	 * quota structure and reflect problem to caller.
	 */
	if (error) {
		mutex_enter(&dqlock);
		LIST_REMOVE(dq, dq_hash);
		mutex_exit(&dqlock);
		mutex_exit(&dq->dq_interlock);
		dqrele(vp, dq);
		*dqp = NODQUOT;
		return (error);
	}
	mutex_exit(&dq->dq_interlock);
	*dqp = dq;
	return (0);
}

/*
 * Obtain a reference to a dquot.
 */
void
dqref(struct dquot *dq)
{

	KASSERT(mutex_owned(&dqlock));
	dq->dq_cnt++;
	KASSERT(dq->dq_cnt > 0);
}

/*
 * Release a reference to a dquot.
 */
void
dqrele(struct vnode *vp, struct dquot *dq)
{

	if (dq == NODQUOT)
		return;
	mutex_enter(&dq->dq_interlock);
	for (;;) {
		mutex_enter(&dqlock);
		if (dq->dq_cnt > 1) {
			dq->dq_cnt--;
			mutex_exit(&dqlock);
			mutex_exit(&dq->dq_interlock);
			return;
		}
		if ((dq->dq_flags & DQ_MOD) == 0)
			break;
		mutex_exit(&dqlock);
#ifdef QUOTA
		if (dq->dq_ump->um_flags & UFS_QUOTA)
			(void) dq1sync(vp, dq);
#endif
#ifdef QUOTA2
		if (dq->dq_ump->um_flags & UFS_QUOTA2)
			(void) dq2sync(vp, dq);
#endif
	}
	KASSERT(dq->dq_cnt == 1 && (dq->dq_flags & DQ_MOD) == 0);
	LIST_REMOVE(dq, dq_hash);
	mutex_exit(&dqlock);
	mutex_exit(&dq->dq_interlock);
	mutex_destroy(&dq->dq_interlock);
	pool_cache_put(dquot_cache, dq);
}

int
qsync(struct mount *mp)
{
	struct ufsmount *ump = VFSTOUFS(mp);
#ifdef QUOTA
	if (ump->um_flags & UFS_QUOTA)
		return q1sync(mp);
#endif
#ifdef QUOTA2
	if (ump->um_flags & UFS_QUOTA2)
		return q2sync(mp);
#endif
	return 0;
}

#ifdef DIAGNOSTIC
/*
 * Check the hash chains for stray dquot's.
 */
void
dqflush(struct vnode *vp)
{
	struct dquot *dq;
	int i;

	mutex_enter(&dqlock);
	for (i = 0; i <= dqhash; i++)
		LIST_FOREACH(dq, &dqhashtbl[i], dq_hash)
			KASSERT(dq->dq_ump->um_quotas[dq->dq_type] != vp);
	mutex_exit(&dqlock);
}
#endif