etc/protocols - sync with NetBSD-8

[minix.git] / sys / ufs / lfs / ulfs_quota1.c

/*      $NetBSD: ulfs_quota1.c,v 1.9 2015/07/26 08:33:53 hannken Exp $  */
/*  from NetBSD: ufs_quota1.c,v 1.18 2012/02/02 03:00:48 matt 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: ulfs_quota1.c,v 1.9 2015/07/26 08:33:53 hannken Exp $");

#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 <ufs/lfs/ulfs_quota1.h>
#include <ufs/lfs/ulfs_inode.h>
#include <ufs/lfs/ulfsmount.h>
#include <ufs/lfs/ulfs_extern.h>
#include <ufs/lfs/ulfs_quota.h>

static int chkdqchg(struct inode *, int64_t, kauth_cred_t, int);
static int chkiqchg(struct inode *, int32_t, kauth_cred_t, int);

/*
 * Update disk usage, and take corrective action.
 */
int
lfs_chkdq1(struct inode *ip, int64_t change, kauth_cred_t cred, int flags)
{
        struct dquot *dq;
        int i;
        int ncurblocks, error;

        if ((error = lfs_getinoquota(ip)) != 0)
                return error;
        if (change == 0)
                return (0);
        if (change < 0) {
                for (i = 0; i < ULFS_MAXQUOTAS; i++) {
                        if ((dq = ip->i_dquot[i]) == NODQUOT)
                                continue;
                        mutex_enter(&dq->dq_interlock);
                        ncurblocks = dq->dq_curblocks + change;
                        if (ncurblocks >= 0)
                                dq->dq_curblocks = ncurblocks;
                        else
                                dq->dq_curblocks = 0;
                        dq->dq_flags &= ~DQ_WARN(QL_BLOCK);
                        dq->dq_flags |= DQ_MOD;
                        mutex_exit(&dq->dq_interlock);
                }
                return (0);
        }
        for (i = 0; i < ULFS_MAXQUOTAS; i++) {
                if ((dq = ip->i_dquot[i]) == NODQUOT)
                        continue;
                if ((flags & FORCE) == 0 &&
                    kauth_authorize_system(cred, KAUTH_SYSTEM_FS_QUOTA,
                    KAUTH_REQ_SYSTEM_FS_QUOTA_NOLIMIT, KAUTH_ARG(i),
                    KAUTH_ARG(QL_BLOCK), NULL) != 0) {
                        mutex_enter(&dq->dq_interlock);
                        error = chkdqchg(ip, change, cred, i);
                        mutex_exit(&dq->dq_interlock);
                        if (error != 0)
                                return (error);
                }
        }
        for (i = 0; i < ULFS_MAXQUOTAS; i++) {
                if ((dq = ip->i_dquot[i]) == NODQUOT)
                        continue;
                mutex_enter(&dq->dq_interlock);
                dq->dq_curblocks += change;
                dq->dq_flags |= DQ_MOD;
                mutex_exit(&dq->dq_interlock);
        }
        return (0);
}

/*
 * Check for a valid change to a users allocation.
 * Issue an error message if appropriate.
 */
static int
chkdqchg(struct inode *ip, int64_t change, kauth_cred_t cred, int type)
{
        struct dquot *dq = ip->i_dquot[type];
        long ncurblocks = dq->dq_curblocks + change;

        KASSERT(mutex_owned(&dq->dq_interlock));
        /*
         * If user would exceed their hard limit, disallow space allocation.
         */
        if (ncurblocks >= dq->dq_bhardlimit && dq->dq_bhardlimit) {
                if ((dq->dq_flags & DQ_WARN(QL_BLOCK)) == 0 &&
                    ip->i_uid == kauth_cred_geteuid(cred)) {
                        uprintf("\n%s: write failed, %s disk limit reached\n",
                            ITOV(ip)->v_mount->mnt_stat.f_mntonname,
                            lfs_quotatypes[type]);
                        dq->dq_flags |= DQ_WARN(QL_BLOCK);
                }
                return (EDQUOT);
        }
        /*
         * If user is over their soft limit for too long, disallow space
         * allocation. Reset time limit as they cross their soft limit.
         */
        if (ncurblocks >= dq->dq_bsoftlimit && dq->dq_bsoftlimit) {
                if (dq->dq_curblocks < dq->dq_bsoftlimit) {
                        dq->dq_btime =
                            time_second + ip->i_ump->umq1_btime[type];
                        if (ip->i_uid == kauth_cred_geteuid(cred))
                                uprintf("\n%s: warning, %s %s\n",
                                    ITOV(ip)->v_mount->mnt_stat.f_mntonname,
                                    lfs_quotatypes[type], "disk quota exceeded");
                        return (0);
                }
                if (time_second > dq->dq_btime) {
                        if ((dq->dq_flags & DQ_WARN(QL_BLOCK)) == 0 &&
                            ip->i_uid == kauth_cred_geteuid(cred)) {
                                uprintf("\n%s: write failed, %s %s\n",
                                    ITOV(ip)->v_mount->mnt_stat.f_mntonname,
                                    lfs_quotatypes[type],
                                    "disk quota exceeded for too long");
                                dq->dq_flags |= DQ_WARN(QL_BLOCK);
                        }
                        return (EDQUOT);
                }
        }
        return (0);
}

/*
 * Check the inode limit, applying corrective action.
 */
int
lfs_chkiq1(struct inode *ip, int32_t change, kauth_cred_t cred, int flags)
{
        struct dquot *dq;
        int i;
        int ncurinodes, error;

        if ((error = lfs_getinoquota(ip)) != 0)
                return error;
        if (change == 0)
                return (0);
        if (change < 0) {
                for (i = 0; i < ULFS_MAXQUOTAS; i++) {
                        if ((dq = ip->i_dquot[i]) == NODQUOT)
                                continue;
                        mutex_enter(&dq->dq_interlock);
                        ncurinodes = dq->dq_curinodes + change;
                        if (ncurinodes >= 0)
                                dq->dq_curinodes = ncurinodes;
                        else
                                dq->dq_curinodes = 0;
                        dq->dq_flags &= ~DQ_WARN(QL_FILE);
                        dq->dq_flags |= DQ_MOD;
                        mutex_exit(&dq->dq_interlock);
                }
                return (0);
        }
        for (i = 0; i < ULFS_MAXQUOTAS; i++) {
                if ((dq = ip->i_dquot[i]) == NODQUOT)
                        continue;
                if ((flags & FORCE) == 0 && kauth_authorize_system(cred,
                    KAUTH_SYSTEM_FS_QUOTA, KAUTH_REQ_SYSTEM_FS_QUOTA_NOLIMIT,
                    KAUTH_ARG(i), KAUTH_ARG(QL_FILE), NULL) != 0) {
                        mutex_enter(&dq->dq_interlock);
                        error = chkiqchg(ip, change, cred, i);
                        mutex_exit(&dq->dq_interlock);
                        if (error != 0)
                                return (error);
                }
        }
        for (i = 0; i < ULFS_MAXQUOTAS; i++) {
                if ((dq = ip->i_dquot[i]) == NODQUOT)
                        continue;
                mutex_enter(&dq->dq_interlock);
                dq->dq_curinodes += change;
                dq->dq_flags |= DQ_MOD;
                mutex_exit(&dq->dq_interlock);
        }
        return (0);
}

/*
 * Check for a valid change to a users allocation.
 * Issue an error message if appropriate.
 */
static int
chkiqchg(struct inode *ip, int32_t change, kauth_cred_t cred, int type)
{
        struct dquot *dq = ip->i_dquot[type];
        long ncurinodes = dq->dq_curinodes + change;

        KASSERT(mutex_owned(&dq->dq_interlock));
        /*
         * If user would exceed their hard limit, disallow inode allocation.
         */
        if (ncurinodes >= dq->dq_ihardlimit && dq->dq_ihardlimit) {
                if ((dq->dq_flags & DQ_WARN(QL_FILE)) == 0 &&
                    ip->i_uid == kauth_cred_geteuid(cred)) {
                        uprintf("\n%s: write failed, %s inode limit reached\n",
                            ITOV(ip)->v_mount->mnt_stat.f_mntonname,
                            lfs_quotatypes[type]);
                        dq->dq_flags |= DQ_WARN(QL_FILE);
                }
                return (EDQUOT);
        }
        /*
         * If user is over their soft limit for too long, disallow inode
         * allocation. Reset time limit as they cross their soft limit.
         */
        if (ncurinodes >= dq->dq_isoftlimit && dq->dq_isoftlimit) {
                if (dq->dq_curinodes < dq->dq_isoftlimit) {
                        dq->dq_itime =
                            time_second + ip->i_ump->umq1_itime[type];
                        if (ip->i_uid == kauth_cred_geteuid(cred))
                                uprintf("\n%s: warning, %s %s\n",
                                    ITOV(ip)->v_mount->mnt_stat.f_mntonname,
                                    lfs_quotatypes[type], "inode quota exceeded");
                        return (0);
                }
                if (time_second > dq->dq_itime) {
                        if ((dq->dq_flags & DQ_WARN(QL_FILE)) == 0 &&
                            ip->i_uid == kauth_cred_geteuid(cred)) {
                                uprintf("\n%s: write failed, %s %s\n",
                                    ITOV(ip)->v_mount->mnt_stat.f_mntonname,
                                    lfs_quotatypes[type],
                                    "inode quota exceeded for too long");
                                dq->dq_flags |= DQ_WARN(QL_FILE);
                        }
                        return (EDQUOT);
                }
        }
        return (0);
}

int
lfsquota1_umount(struct mount *mp, int flags)
{
        int i, error;
        struct ulfsmount *ump = VFSTOULFS(mp);
        struct lfs *fs = ump->um_lfs;
        struct lwp *l = curlwp;

        if ((fs->um_flags & ULFS_QUOTA) == 0)
                return 0;

        if ((error = vflush(mp, NULLVP, SKIPSYSTEM | flags)) != 0)
                return (error);

        for (i = 0; i < ULFS_MAXQUOTAS; i++) {
                if (ump->um_quotas[i] != NULLVP) {
                        lfsquota1_handle_cmd_quotaoff(l, ump, i);
                }
        }
        return 0;
}

/*
 * Code to process quotactl commands.
 */

/*
 * set up a quota file for a particular file system.
 */
int
lfsquota1_handle_cmd_quotaon(struct lwp *l, struct ulfsmount *ump, int type,
    const char *fname)
{
        struct mount *mp = ump->um_mountp;
        struct lfs *fs = ump->um_lfs;
        struct vnode *vp, **vpp;
        struct vnode_iterator *marker;
        struct dquot *dq;
        int error;
        struct pathbuf *pb;
        struct nameidata nd;

        if (fs->um_flags & ULFS_QUOTA2) {
                uprintf("%s: quotas v2 already enabled\n",
                    mp->mnt_stat.f_mntonname);
                return (EBUSY);
        }
                
        vpp = &ump->um_quotas[type];

        pb = pathbuf_create(fname);
        if (pb == NULL) {
                return ENOMEM;
        }
        NDINIT(&nd, LOOKUP, FOLLOW, pb);
        if ((error = vn_open(&nd, FREAD|FWRITE, 0)) != 0) {
                pathbuf_destroy(pb);
                return error;
        }
        vp = nd.ni_vp;
        pathbuf_destroy(pb);

        VOP_UNLOCK(vp);
        if (vp->v_type != VREG) {
                (void) vn_close(vp, FREAD|FWRITE, l->l_cred);
                return (EACCES);
        }
        if (*vpp != vp)
                lfsquota1_handle_cmd_quotaoff(l, ump, type);
        mutex_enter(&lfs_dqlock);
        while ((ump->umq1_qflags[type] & (QTF_CLOSING | QTF_OPENING)) != 0)
                cv_wait(&lfs_dqcv, &lfs_dqlock);
        ump->umq1_qflags[type] |= QTF_OPENING;
        mutex_exit(&lfs_dqlock);
        mp->mnt_flag |= MNT_QUOTA;
        vp->v_vflag |= VV_SYSTEM;       /* XXXSMP */
        *vpp = vp;
        /*
         * Save the credential of the process that turned on quotas.
         * Set up the time limits for this quota.
         */
        kauth_cred_hold(l->l_cred);
        ump->um_cred[type] = l->l_cred;
        ump->umq1_btime[type] = MAX_DQ_TIME;
        ump->umq1_itime[type] = MAX_IQ_TIME;
        if (lfs_dqget(NULLVP, 0, ump, type, &dq) == 0) {
                if (dq->dq_btime > 0)
                        ump->umq1_btime[type] = dq->dq_btime;
                if (dq->dq_itime > 0)
                        ump->umq1_itime[type] = dq->dq_itime;
                lfs_dqrele(NULLVP, dq);
        }
        /*
         * Search vnodes associated with this mount point,
         * adding references to quota file being opened.
         * NB: only need to add dquot's for inodes being modified.
         */
        vfs_vnode_iterator_init(mp, &marker);
        while ((vp = vfs_vnode_iterator_next(marker, NULL, NULL))) {
                error = vn_lock(vp, LK_EXCLUSIVE);
                if (error) {
                        vrele(vp);
                        continue;
                }
                mutex_enter(vp->v_interlock);
                if (VTOI(vp) == NULL || vp->v_type == VNON ||
                    vp->v_writecount == 0) {
                        mutex_exit(vp->v_interlock);
                        vput(vp);
                        continue;
                }
                mutex_exit(vp->v_interlock);
                if ((error = lfs_getinoquota(VTOI(vp))) != 0) {
                        vput(vp);
                        break;
                }
                vput(vp);
        }
        vfs_vnode_iterator_destroy(marker);

        mutex_enter(&lfs_dqlock);
        ump->umq1_qflags[type] &= ~QTF_OPENING;
        cv_broadcast(&lfs_dqcv);
        if (error == 0)
                fs->um_flags |= ULFS_QUOTA;
        mutex_exit(&lfs_dqlock);
        if (error)
                lfsquota1_handle_cmd_quotaoff(l, ump, type);
        return (error);
}

/*
 * turn off disk quotas for a filesystem.
 */
int
lfsquota1_handle_cmd_quotaoff(struct lwp *l, struct ulfsmount *ump, int type)
{
        struct mount *mp = ump->um_mountp;
        struct lfs *fs = ump->um_lfs;
        struct vnode *vp;
        struct vnode *qvp;
        struct vnode_iterator *marker;
        struct dquot *dq;
        struct inode *ip;
        kauth_cred_t cred;
        int i, error;

        mutex_enter(&lfs_dqlock);
        while ((ump->umq1_qflags[type] & (QTF_CLOSING | QTF_OPENING)) != 0)
                cv_wait(&lfs_dqcv, &lfs_dqlock);
        if ((qvp = ump->um_quotas[type]) == NULLVP) {
                mutex_exit(&lfs_dqlock);
                return (0);
        }
        ump->umq1_qflags[type] |= QTF_CLOSING;
        fs->um_flags &= ~ULFS_QUOTA;
        mutex_exit(&lfs_dqlock);
        /*
         * Search vnodes associated with this mount point,
         * deleting any references to quota file being closed.
         */
        vfs_vnode_iterator_init(mp, &marker);
        while ((vp = vfs_vnode_iterator_next(marker, NULL, NULL))) {
                error = vn_lock(vp, LK_EXCLUSIVE);
                if (error) {
                        vrele(vp);
                        continue;
                }
                ip = VTOI(vp);
                if (ip == NULL || vp->v_type == VNON) {
                        vput(vp);
                        continue;
                }
                dq = ip->i_dquot[type];
                ip->i_dquot[type] = NODQUOT;
                lfs_dqrele(vp, dq);
                vput(vp);
        }
        vfs_vnode_iterator_destroy(marker);
#ifdef DIAGNOSTIC
        lfs_dqflush(qvp);
#endif
        qvp->v_vflag &= ~VV_SYSTEM;
        error = vn_close(qvp, FREAD|FWRITE, l->l_cred);
        mutex_enter(&lfs_dqlock);
        ump->um_quotas[type] = NULLVP;
        cred = ump->um_cred[type];
        ump->um_cred[type] = NOCRED;
        for (i = 0; i < ULFS_MAXQUOTAS; i++)
                if (ump->um_quotas[i] != NULLVP)
                        break;
        ump->umq1_qflags[type] &= ~QTF_CLOSING;
        cv_broadcast(&lfs_dqcv);
        mutex_exit(&lfs_dqlock);
        kauth_cred_free(cred);
        if (i == ULFS_MAXQUOTAS)
                mp->mnt_flag &= ~MNT_QUOTA;
        return (error);
}

int             
lfsquota1_handle_cmd_get(struct ulfsmount *ump, const struct quotakey *qk,
    struct quotaval *qv)
{
        struct dquot *dq;
        int error;
        struct quotaval blocks, files;
        int idtype;
        id_t id;

        idtype = qk->qk_idtype;
        id = qk->qk_id;

        if (ump->um_quotas[idtype] == NULLVP)
                return ENODEV;

        if (id == QUOTA_DEFAULTID) { /* we want the grace period of id 0 */
                if ((error = lfs_dqget(NULLVP, 0, ump, idtype, &dq)) != 0)
                        return error;

        } else {
                if ((error = lfs_dqget(NULLVP, id, ump, idtype, &dq)) != 0)
                        return error;
        }
        lfs_dqblk_to_quotavals(&dq->dq_un.dq1_dqb, &blocks, &files);
        lfs_dqrele(NULLVP, dq);
        if (id == QUOTA_DEFAULTID) {
                if (blocks.qv_expiretime > 0)
                        blocks.qv_grace = blocks.qv_expiretime;
                else
                        blocks.qv_grace = MAX_DQ_TIME;
                if (files.qv_expiretime > 0)
                        files.qv_grace = files.qv_expiretime;
                else
                        files.qv_grace = MAX_DQ_TIME;
        }

        switch (qk->qk_objtype) {
            case QUOTA_OBJTYPE_BLOCKS:
                *qv = blocks;
                break;
            case QUOTA_OBJTYPE_FILES:
                *qv = files;
                break;
            default:
                return EINVAL;
        }

        return 0;
}

static uint32_t
quota1_encode_limit(uint64_t lim)
{
        if (lim == QUOTA_NOLIMIT || lim >= 0xffffffff) {
                return 0;
        }
        return lim;
}

int
lfsquota1_handle_cmd_put(struct ulfsmount *ump, const struct quotakey *key,
    const struct quotaval *val)
{
        struct dquot *dq;
        struct dqblk dqb;
        int error;

        switch (key->qk_idtype) {
            case QUOTA_IDTYPE_USER:
            case QUOTA_IDTYPE_GROUP:
                break;
            default:
                return EINVAL;
        }

        switch (key->qk_objtype) {
            case QUOTA_OBJTYPE_BLOCKS:
            case QUOTA_OBJTYPE_FILES:
                break;
            default:
                return EINVAL;
        }

        if (ump->um_quotas[key->qk_idtype] == NULLVP)
                return ENODEV;

        if (key->qk_id == QUOTA_DEFAULTID) {
                /* just update grace times */
                id_t id = 0;

                if ((error = lfs_dqget(NULLVP, id, ump, key->qk_idtype, &dq)) != 0)
                        return error;
                mutex_enter(&dq->dq_interlock);
                if (val->qv_grace != QUOTA_NOTIME) {
                        if (key->qk_objtype == QUOTA_OBJTYPE_BLOCKS)
                                ump->umq1_btime[key->qk_idtype] = dq->dq_btime =
                                        val->qv_grace;
                        if (key->qk_objtype == QUOTA_OBJTYPE_FILES)
                                ump->umq1_itime[key->qk_idtype] = dq->dq_itime =
                                        val->qv_grace;
                }
                dq->dq_flags |= DQ_MOD;
                mutex_exit(&dq->dq_interlock);
                lfs_dqrele(NULLVP, dq);
                return 0;
        }

        if ((error = lfs_dqget(NULLVP, key->qk_id, ump, key->qk_idtype, &dq)) != 0)
                return (error);
        mutex_enter(&dq->dq_interlock);
        /*
         * Copy all but the current values.
         * Reset time limit if previously had no soft limit or were
         * under it, but now have a soft limit and are over it.
         */
        dqb.dqb_curblocks = dq->dq_curblocks;
        dqb.dqb_curinodes = dq->dq_curinodes;
        dqb.dqb_btime = dq->dq_btime;
        dqb.dqb_itime = dq->dq_itime;
        if (key->qk_objtype == QUOTA_OBJTYPE_BLOCKS) {
                dqb.dqb_bsoftlimit = quota1_encode_limit(val->qv_softlimit);
                dqb.dqb_bhardlimit = quota1_encode_limit(val->qv_hardlimit);
                dqb.dqb_isoftlimit = dq->dq_isoftlimit;
                dqb.dqb_ihardlimit = dq->dq_ihardlimit;
        } else {
                KASSERT(key->qk_objtype == QUOTA_OBJTYPE_FILES);
                dqb.dqb_bsoftlimit = dq->dq_bsoftlimit;
                dqb.dqb_bhardlimit = dq->dq_bhardlimit;
                dqb.dqb_isoftlimit = quota1_encode_limit(val->qv_softlimit);
                dqb.dqb_ihardlimit = quota1_encode_limit(val->qv_hardlimit);
        }
        if (dq->dq_id == 0 && val->qv_grace != QUOTA_NOTIME) {
                /* also update grace time if available */
                if (key->qk_objtype == QUOTA_OBJTYPE_BLOCKS) {
                        ump->umq1_btime[key->qk_idtype] = dqb.dqb_btime =
                                val->qv_grace;
                }
                if (key->qk_objtype == QUOTA_OBJTYPE_FILES) {
                        ump->umq1_itime[key->qk_idtype] = dqb.dqb_itime =
                                val->qv_grace;
                }
        }
        if (dqb.dqb_bsoftlimit &&
            dq->dq_curblocks >= dqb.dqb_bsoftlimit &&
            (dq->dq_bsoftlimit == 0 || dq->dq_curblocks < dq->dq_bsoftlimit))
                dqb.dqb_btime = time_second + ump->umq1_btime[key->qk_idtype];
        if (dqb.dqb_isoftlimit &&
            dq->dq_curinodes >= dqb.dqb_isoftlimit &&
            (dq->dq_isoftlimit == 0 || dq->dq_curinodes < dq->dq_isoftlimit))
                dqb.dqb_itime = time_second + ump->umq1_itime[key->qk_idtype];
        dq->dq_un.dq1_dqb = dqb;
        if (dq->dq_curblocks < dq->dq_bsoftlimit)
                dq->dq_flags &= ~DQ_WARN(QL_BLOCK);
        if (dq->dq_curinodes < dq->dq_isoftlimit)
                dq->dq_flags &= ~DQ_WARN(QL_FILE);
        if (dq->dq_isoftlimit == 0 && dq->dq_bsoftlimit == 0 &&
            dq->dq_ihardlimit == 0 && dq->dq_bhardlimit == 0)
                dq->dq_flags |= DQ_FAKE;
        else
                dq->dq_flags &= ~DQ_FAKE;
        dq->dq_flags |= DQ_MOD;
        mutex_exit(&dq->dq_interlock);
        lfs_dqrele(NULLVP, dq);
        return (0);
}


#if 0
/*
 * Q_SETQUOTA - assign an entire dqblk structure.
 */
int
setquota1(struct mount *mp, u_long id, int type, struct dqblk *dqb)
{
        struct dquot *dq;
        struct dquot *ndq;
        struct ulfsmount *ump = VFSTOULFS(mp);
        

        if ((error = lfs_dqget(NULLVP, id, ump, type, &ndq)) != 0)
                return (error);
        dq = ndq;
        mutex_enter(&dq->dq_interlock);
        /*
         * Copy all but the current values.
         * Reset time limit if previously had no soft limit or were
         * under it, but now have a soft limit and are over it.
         */
        dqb->dqb_curblocks = dq->dq_curblocks;
        dqb->dqb_curinodes = dq->dq_curinodes;
        if (dq->dq_id != 0) {
                dqb->dqb_btime = dq->dq_btime;
                dqb->dqb_itime = dq->dq_itime;
        }
        if (dqb->dqb_bsoftlimit &&
            dq->dq_curblocks >= dqb->dqb_bsoftlimit &&
            (dq->dq_bsoftlimit == 0 || dq->dq_curblocks < dq->dq_bsoftlimit))
                dqb->dqb_btime = time_second + ump->umq1_btime[type];
        if (dqb->dqb_isoftlimit &&
            dq->dq_curinodes >= dqb->dqb_isoftlimit &&
            (dq->dq_isoftlimit == 0 || dq->dq_curinodes < dq->dq_isoftlimit))
                dqb->dqb_itime = time_second + ump->umq1_itime[type];
        dq->dq_un.dq1_dqb = *dqb;
        if (dq->dq_curblocks < dq->dq_bsoftlimit)
                dq->dq_flags &= ~DQ_WARN(QL_BLOCK);
        if (dq->dq_curinodes < dq->dq_isoftlimit)
                dq->dq_flags &= ~DQ_WARN(QL_FILE);
        if (dq->dq_isoftlimit == 0 && dq->dq_bsoftlimit == 0 &&
            dq->dq_ihardlimit == 0 && dq->dq_bhardlimit == 0)
                dq->dq_flags |= DQ_FAKE;
        else
                dq->dq_flags &= ~DQ_FAKE;
        dq->dq_flags |= DQ_MOD;
        mutex_exit(&dq->dq_interlock);
        lfs_dqrele(NULLVP, dq);
        return (0);
}

/*
 * Q_SETUSE - set current inode and block usage.
 */
int
setuse(struct mount *mp, u_long id, int type, void *addr)
{
        struct dquot *dq;
        struct ulfsmount *ump = VFSTOULFS(mp);
        struct dquot *ndq;
        struct dqblk usage;
        int error;

        error = copyin(addr, (void *)&usage, sizeof (struct dqblk));
        if (error)
                return (error);
        if ((error = lfs_dqget(NULLVP, id, ump, type, &ndq)) != 0)
                return (error);
        dq = ndq;
        mutex_enter(&dq->dq_interlock);
        /*
         * Reset time limit if have a soft limit and were
         * previously under it, but are now over it.
         */
        if (dq->dq_bsoftlimit && dq->dq_curblocks < dq->dq_bsoftlimit &&
            usage.dqb_curblocks >= dq->dq_bsoftlimit)
                dq->dq_btime = time_second + ump->umq1_btime[type];
        if (dq->dq_isoftlimit && dq->dq_curinodes < dq->dq_isoftlimit &&
            usage.dqb_curinodes >= dq->dq_isoftlimit)
                dq->dq_itime = time_second + ump->umq1_itime[type];
        dq->dq_curblocks = usage.dqb_curblocks;
        dq->dq_curinodes = usage.dqb_curinodes;
        if (dq->dq_curblocks < dq->dq_bsoftlimit)
                dq->dq_flags &= ~DQ_WARN(QL_BLOCK);
        if (dq->dq_curinodes < dq->dq_isoftlimit)
                dq->dq_flags &= ~DQ_WARN(QL_FILE);
        dq->dq_flags |= DQ_MOD;
        mutex_exit(&dq->dq_interlock);
        lfs_dqrele(NULLVP, dq);
        return (0);
}
#endif

/*
 * Q_SYNC - sync quota files to disk.
 */
int
lfs_q1sync(struct mount *mp)
{
        struct ulfsmount *ump = VFSTOULFS(mp);
        struct vnode *vp;
        struct vnode_iterator *marker;
        struct dquot *dq;
        int i, error;

        /*
         * Check if the mount point has any quotas.
         * If not, simply return.
         */
        for (i = 0; i < ULFS_MAXQUOTAS; i++)
                if (ump->um_quotas[i] != NULLVP)
                        break;
        if (i == ULFS_MAXQUOTAS)
                return (0);

        /*
         * Search vnodes associated with this mount point,
         * synchronizing any modified dquot structures.
         */
        vfs_vnode_iterator_init(mp, &marker);
        while ((vp = vfs_vnode_iterator_next(marker, NULL, NULL))) {
                error = vn_lock(vp, LK_EXCLUSIVE);
                if (error) {
                        vrele(vp);
                        continue;
                }
                if (VTOI(vp) == NULL || vp->v_type == VNON) {
                        vput(vp);
                        continue;
                }
                for (i = 0; i < ULFS_MAXQUOTAS; i++) {
                        dq = VTOI(vp)->i_dquot[i];
                        if (dq == NODQUOT)
                                continue;
                        mutex_enter(&dq->dq_interlock);
                        if (dq->dq_flags & DQ_MOD)
                                lfs_dq1sync(vp, dq);
                        mutex_exit(&dq->dq_interlock);
                }
                vput(vp);
        }
        vfs_vnode_iterator_destroy(marker);
        return (0);
}

/*
 * Obtain a dquot structure for the specified identifier and quota file
 * reading the information from the file if necessary.
 */
int
lfs_dq1get(struct vnode *dqvp, u_long id, struct ulfsmount *ump, int type,
    struct dquot *dq)
{
        struct iovec aiov;
        struct uio auio;
        int error;

        KASSERT(mutex_owned(&dq->dq_interlock));
        vn_lock(dqvp, LK_EXCLUSIVE | LK_RETRY);
        auio.uio_iov = &aiov;
        auio.uio_iovcnt = 1;
        aiov.iov_base = (void *)&dq->dq_un.dq1_dqb;
        aiov.iov_len = sizeof (struct dqblk);
        auio.uio_resid = sizeof (struct dqblk);
        auio.uio_offset = (off_t)(id * sizeof (struct dqblk));
        auio.uio_rw = UIO_READ;
        UIO_SETUP_SYSSPACE(&auio);
        error = VOP_READ(dqvp, &auio, 0, ump->um_cred[type]);
        if (auio.uio_resid == sizeof(struct dqblk) && error == 0)
                memset((void *)&dq->dq_un.dq1_dqb, 0, sizeof(struct dqblk));
        VOP_UNLOCK(dqvp);
        /*
         * I/O error in reading quota file, release
         * quota structure and reflect problem to caller.
         */
        if (error)
                return (error);
        /*
         * Check for no limit to enforce.
         * Initialize time values if necessary.
         */
        if (dq->dq_isoftlimit == 0 && dq->dq_bsoftlimit == 0 &&
            dq->dq_ihardlimit == 0 && dq->dq_bhardlimit == 0)
                dq->dq_flags |= DQ_FAKE;
        if (dq->dq_id != 0) {
                if (dq->dq_btime == 0)
                        dq->dq_btime = time_second + ump->umq1_btime[type];
                if (dq->dq_itime == 0)
                        dq->dq_itime = time_second + ump->umq1_itime[type];
        }
        return (0);
}

/*
 * Update the disk quota in the quota file.
 */
int
lfs_dq1sync(struct vnode *vp, struct dquot *dq)
{
        struct vnode *dqvp;
        struct iovec aiov;
        struct uio auio;
        int error;

        if (dq == NODQUOT)
                panic("dq1sync: dquot");
        KASSERT(mutex_owned(&dq->dq_interlock));
        if ((dq->dq_flags & DQ_MOD) == 0)
                return (0);
        if ((dqvp = dq->dq_ump->um_quotas[dq->dq_type]) == NULLVP)
                panic("dq1sync: file");
        KASSERT(dqvp != vp);
        vn_lock(dqvp, LK_EXCLUSIVE | LK_RETRY);
        auio.uio_iov = &aiov;
        auio.uio_iovcnt = 1;
        aiov.iov_base = (void *)&dq->dq_un.dq1_dqb;
        aiov.iov_len = sizeof (struct dqblk);
        auio.uio_resid = sizeof (struct dqblk);
        auio.uio_offset = (off_t)(dq->dq_id * sizeof (struct dqblk));
        auio.uio_rw = UIO_WRITE;
        UIO_SETUP_SYSSPACE(&auio);
        error = VOP_WRITE(dqvp, &auio, 0, dq->dq_ump->um_cred[dq->dq_type]);
        if (auio.uio_resid && error == 0)
                error = EIO;
        dq->dq_flags &= ~DQ_MOD;
        VOP_UNLOCK(dqvp);
        return (error);
}