2 * Copyright (c) 1982, 1986, 1990, 1993, 1995
3 * The Regents of the University of California. All rights reserved.
5 * This code is derived from software contributed to Berkeley by
6 * Robert Elz at The University of Melbourne.
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
16 * 3. All advertising materials mentioning features or use of this software
17 * must display the following acknowledgement:
18 * This product includes software developed by the University of
19 * California, Berkeley and its contributors.
20 * 4. Neither the name of the University nor the names of its contributors
21 * may be used to endorse or promote products derived from this software
22 * without specific prior written permission.
24 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
36 * @(#)ufs_quota.c 8.5 (Berkeley) 5/20/95
37 * $FreeBSD: src/sys/ufs/ufs/ufs_quota.c,v 1.27.2.3 2002/01/15 10:33:32 phk Exp $
38 * $DragonFly: src/sys/vfs/ufs/ufs_quota.c,v 1.12 2004/03/01 06:33:23 dillon Exp $
41 #include <sys/param.h>
42 #include <sys/systm.h>
43 #include <sys/kernel.h>
44 #include <sys/malloc.h>
45 #include <sys/fcntl.h>
47 #include <sys/namei.h>
48 #include <sys/vnode.h>
49 #include <sys/mount.h>
50 #include <vm/vm_zone.h>
56 static MALLOC_DEFINE(M_DQUOT, "UFS quota", "UFS quota entries");
59 * Quota name to error message mapping.
61 static char *quotatypes[] = INITQFNAMES;
63 static int chkdqchg (struct inode *, long, struct ucred *, int);
64 static int chkiqchg (struct inode *, long, struct ucred *, int);
65 static int dqget (struct vnode *,
66 u_long, struct ufsmount *, int, struct dquot **);
67 static int dqsync (struct vnode *, struct dquot *);
68 static void dqflush (struct vnode *);
71 static void dqref (struct dquot *);
72 static void chkdquot (struct inode *);
76 * Set up the quotas for an inode.
78 * This routine completely defines the semantics of quotas.
79 * If other criterion want to be used to establish quotas, the
80 * MAXQUOTAS value in quotas.h should be increased, and the
81 * additional dquots set up here.
88 struct vnode *vp = ITOV(ip);
91 ump = VFSTOUFS(vp->v_mount);
93 * Set up the user quota based on file uid.
94 * EINVAL means that quotas are not enabled.
96 if (ip->i_dquot[USRQUOTA] == NODQUOT &&
98 dqget(vp, ip->i_uid, ump, USRQUOTA, &ip->i_dquot[USRQUOTA])) &&
102 * Set up the group quota based on file gid.
103 * EINVAL means that quotas are not enabled.
105 if (ip->i_dquot[GRPQUOTA] == NODQUOT &&
107 dqget(vp, ip->i_gid, ump, GRPQUOTA, &ip->i_dquot[GRPQUOTA])) &&
114 * Update disk usage, and take corrective action.
117 chkdq(ip, change, cred, flags)
125 int ncurblocks, error;
128 if ((flags & CHOWN) == 0)
134 for (i = 0; i < MAXQUOTAS; i++) {
135 if ((dq = ip->i_dquot[i]) == NODQUOT)
137 while (dq->dq_flags & DQ_LOCK) {
138 dq->dq_flags |= DQ_WANT;
139 (void) tsleep((caddr_t)dq, 0, "chkdq1", 0);
141 ncurblocks = dq->dq_curblocks + change;
143 dq->dq_curblocks = ncurblocks;
145 dq->dq_curblocks = 0;
146 dq->dq_flags &= ~DQ_BLKS;
147 dq->dq_flags |= DQ_MOD;
151 if ((flags & FORCE) == 0 && cred->cr_uid != 0) {
152 for (i = 0; i < MAXQUOTAS; i++) {
153 if ((dq = ip->i_dquot[i]) == NODQUOT)
155 error = chkdqchg(ip, change, cred, i);
160 for (i = 0; i < MAXQUOTAS; i++) {
161 if ((dq = ip->i_dquot[i]) == NODQUOT)
163 while (dq->dq_flags & DQ_LOCK) {
164 dq->dq_flags |= DQ_WANT;
165 (void) tsleep((caddr_t)dq, 0, "chkdq2", 0);
167 /* Reset timer when crossing soft limit */
168 if (dq->dq_curblocks + change >= dq->dq_bsoftlimit &&
169 dq->dq_curblocks < dq->dq_bsoftlimit)
170 dq->dq_btime = time_second +
171 VFSTOUFS(ITOV(ip)->v_mount)->um_btime[i];
172 dq->dq_curblocks += change;
173 dq->dq_flags |= DQ_MOD;
179 * Check for a valid change to a users allocation.
180 * Issue an error message if appropriate.
183 chkdqchg(ip, change, cred, type)
189 struct dquot *dq = ip->i_dquot[type];
190 long ncurblocks = dq->dq_curblocks + change;
193 * If user would exceed their hard limit, disallow space allocation.
195 if (ncurblocks >= dq->dq_bhardlimit && dq->dq_bhardlimit) {
196 if ((dq->dq_flags & DQ_BLKS) == 0 &&
197 ip->i_uid == cred->cr_uid) {
198 uprintf("\n%s: write failed, %s disk limit reached\n",
199 ITOV(ip)->v_mount->mnt_stat.f_mntonname,
201 dq->dq_flags |= DQ_BLKS;
206 * If user is over their soft limit for too long, disallow space
207 * allocation. Reset time limit as they cross their soft limit.
209 if (ncurblocks >= dq->dq_bsoftlimit && dq->dq_bsoftlimit) {
210 if (dq->dq_curblocks < dq->dq_bsoftlimit) {
211 dq->dq_btime = time_second +
212 VFSTOUFS(ITOV(ip)->v_mount)->um_btime[type];
213 if (ip->i_uid == cred->cr_uid)
214 uprintf("\n%s: warning, %s %s\n",
215 ITOV(ip)->v_mount->mnt_stat.f_mntonname,
216 quotatypes[type], "disk quota exceeded");
219 if (time_second > dq->dq_btime) {
220 if ((dq->dq_flags & DQ_BLKS) == 0 &&
221 ip->i_uid == cred->cr_uid) {
222 uprintf("\n%s: write failed, %s %s\n",
223 ITOV(ip)->v_mount->mnt_stat.f_mntonname,
225 "disk quota exceeded for too long");
226 dq->dq_flags |= DQ_BLKS;
235 * Check the inode limit, applying corrective action.
238 chkiq(ip, change, cred, flags)
246 int ncurinodes, error;
249 if ((flags & CHOWN) == 0)
255 for (i = 0; i < MAXQUOTAS; i++) {
256 if ((dq = ip->i_dquot[i]) == NODQUOT)
258 while (dq->dq_flags & DQ_LOCK) {
259 dq->dq_flags |= DQ_WANT;
260 (void) tsleep((caddr_t)dq, 0, "chkiq1", 0);
262 ncurinodes = dq->dq_curinodes + change;
264 dq->dq_curinodes = ncurinodes;
266 dq->dq_curinodes = 0;
267 dq->dq_flags &= ~DQ_INODS;
268 dq->dq_flags |= DQ_MOD;
272 if ((flags & FORCE) == 0 && cred->cr_uid != 0) {
273 for (i = 0; i < MAXQUOTAS; i++) {
274 if ((dq = ip->i_dquot[i]) == NODQUOT)
276 error = chkiqchg(ip, change, cred, i);
281 for (i = 0; i < MAXQUOTAS; i++) {
282 if ((dq = ip->i_dquot[i]) == NODQUOT)
284 while (dq->dq_flags & DQ_LOCK) {
285 dq->dq_flags |= DQ_WANT;
286 (void) tsleep((caddr_t)dq, 0, "chkiq2", 0);
288 /* Reset timer when crossing soft limit */
289 if (dq->dq_curinodes + change >= dq->dq_isoftlimit &&
290 dq->dq_curinodes < dq->dq_isoftlimit)
291 dq->dq_itime = time_second +
292 VFSTOUFS(ITOV(ip)->v_mount)->um_itime[i];
293 dq->dq_curinodes += change;
294 dq->dq_flags |= DQ_MOD;
300 * Check for a valid change to a users allocation.
301 * Issue an error message if appropriate.
304 chkiqchg(ip, change, cred, type)
310 struct dquot *dq = ip->i_dquot[type];
311 long ncurinodes = dq->dq_curinodes + change;
314 * If user would exceed their hard limit, disallow inode allocation.
316 if (ncurinodes >= dq->dq_ihardlimit && dq->dq_ihardlimit) {
317 if ((dq->dq_flags & DQ_INODS) == 0 &&
318 ip->i_uid == cred->cr_uid) {
319 uprintf("\n%s: write failed, %s inode limit reached\n",
320 ITOV(ip)->v_mount->mnt_stat.f_mntonname,
322 dq->dq_flags |= DQ_INODS;
327 * If user is over their soft limit for too long, disallow inode
328 * allocation. Reset time limit as they cross their soft limit.
330 if (ncurinodes >= dq->dq_isoftlimit && dq->dq_isoftlimit) {
331 if (dq->dq_curinodes < dq->dq_isoftlimit) {
332 dq->dq_itime = time_second +
333 VFSTOUFS(ITOV(ip)->v_mount)->um_itime[type];
334 if (ip->i_uid == cred->cr_uid)
335 uprintf("\n%s: warning, %s %s\n",
336 ITOV(ip)->v_mount->mnt_stat.f_mntonname,
337 quotatypes[type], "inode quota exceeded");
340 if (time_second > dq->dq_itime) {
341 if ((dq->dq_flags & DQ_INODS) == 0 &&
342 ip->i_uid == cred->cr_uid) {
343 uprintf("\n%s: write failed, %s %s\n",
344 ITOV(ip)->v_mount->mnt_stat.f_mntonname,
346 "inode quota exceeded for too long");
347 dq->dq_flags |= DQ_INODS;
357 * On filesystems with quotas enabled, it is an error for a file to change
358 * size and not to have a dquot structure associated with it.
364 struct ufsmount *ump = VFSTOUFS(ITOV(ip)->v_mount);
367 for (i = 0; i < MAXQUOTAS; i++) {
368 if (ump->um_quotas[i] == NULLVP ||
369 (ump->um_qflags[i] & (QTF_OPENING|QTF_CLOSING)))
371 if (ip->i_dquot[i] == NODQUOT) {
372 vprint("chkdquot: missing dquot", ITOV(ip));
373 panic("chkdquot: missing dquot");
380 * Code to process quotactl commands.
390 * Q_QUOTAON - set up a quota file for a particular file system.
392 static int quotaon_scan(struct mount *mp, struct vnode *vp,
393 lwkt_tokref_t vlock, void *data);
396 quotaon(td, mp, type, fname)
402 struct ufsmount *ump = VFSTOUFS(mp);
403 struct vnode *vp, **vpp;
408 struct scaninfo scaninfo;
410 KKASSERT(td->td_proc);
411 cred = td->td_proc->p_ucred;
413 vpp = &ump->um_quotas[type];
414 NDINIT(&nd, NAMEI_LOOKUP, CNP_FOLLOW, UIO_USERSPACE, fname, td);
415 error = vn_open(&nd, FREAD|FWRITE, 0);
418 NDFREE(&nd, NDF_ONLY_PNBUF);
420 VOP_UNLOCK(vp, NULL, 0, td);
421 if (vp->v_type != VREG) {
422 (void) vn_close(vp, FREAD|FWRITE, td);
426 quotaoff(td, mp, type);
427 ump->um_qflags[type] |= QTF_OPENING;
428 mp->mnt_flag |= MNT_QUOTA;
429 vp->v_flag |= VSYSTEM;
432 * Save the credential of the process that turned on quotas.
433 * Set up the time limits for this quota.
435 ump->um_cred[type] = crhold(cred);
436 ump->um_btime[type] = MAX_DQ_TIME;
437 ump->um_itime[type] = MAX_IQ_TIME;
438 if (dqget(NULLVP, 0, ump, type, &dq) == 0) {
439 if (dq->dq_btime > 0)
440 ump->um_btime[type] = dq->dq_btime;
441 if (dq->dq_itime > 0)
442 ump->um_itime[type] = dq->dq_itime;
446 * Search vnodes associated with this mount point,
447 * adding references to quota file being opened.
448 * NB: only need to add dquot's for inodes being modified.
452 while (scaninfo.rescan) {
454 error = vmntvnodescan(mp, NULL, quotaon_scan, &scaninfo);
458 ump->um_qflags[type] &= ~QTF_OPENING;
460 quotaoff(td, mp, type);
466 quotaon_scan(struct mount *mp, struct vnode *vp,
467 lwkt_tokref_t vlock, void *data)
470 struct scaninfo *info = data;
472 if (vp->v_type == VNON || vp->v_writecount == 0) {
473 lwkt_reltoken(vlock);
476 if (vget(vp, vlock, LK_INTERLOCK|LK_EXCLUSIVE, info->td)) {
480 error = getinoquota(VTOI(vp));
486 * Q_QUOTAOFF - turn off disk quotas for a filesystem.
489 static int quotaoff_scan(struct mount *mp, struct vnode *vp,
490 lwkt_tokref_t vlock, void *data);
493 quotaoff(struct thread *td, struct mount *mp, int type)
496 struct ufsmount *ump = VFSTOUFS(mp);
499 struct scaninfo scaninfo;
501 KKASSERT(td->td_proc);
502 cred = td->td_proc->p_ucred;
504 if ((qvp = ump->um_quotas[type]) == NULLVP)
506 ump->um_qflags[type] |= QTF_CLOSING;
509 * Search vnodes associated with this mount point,
510 * deleting any references to quota file being closed.
514 scaninfo.type = type;
515 while (scaninfo.rescan) {
517 vmntvnodescan(mp, NULL, quotaoff_scan, &scaninfo);
520 qvp->v_flag &= ~VSYSTEM;
521 error = vn_close(qvp, FREAD|FWRITE, td);
522 ump->um_quotas[type] = NULLVP;
523 crfree(ump->um_cred[type]);
524 ump->um_cred[type] = NOCRED;
525 ump->um_qflags[type] &= ~QTF_CLOSING;
526 for (type = 0; type < MAXQUOTAS; type++) {
527 if (ump->um_quotas[type] != NULLVP)
530 if (type == MAXQUOTAS)
531 mp->mnt_flag &= ~MNT_QUOTA;
537 quotaoff_scan(struct mount *mp, struct vnode *vp,
538 lwkt_tokref_t vlock, void *data)
540 struct scaninfo *info = data;
544 if (vp->v_type == VNON) {
545 lwkt_reltoken(vlock);
548 if (vget(vp, vlock, LK_INTERLOCK|LK_EXCLUSIVE, info->td)) {
553 dq = ip->i_dquot[info->type];
554 ip->i_dquot[info->type] = NODQUOT;
561 * Q_GETQUOTA - return current values in a dqblk structure.
564 getquota(mp, id, type, addr)
573 error = dqget(NULLVP, id, VFSTOUFS(mp), type, &dq);
576 error = copyout((caddr_t)&dq->dq_dqb, addr, sizeof (struct dqblk));
582 * Q_SETQUOTA - assign an entire dqblk structure.
585 setquota(mp, id, type, addr)
593 struct ufsmount *ump = VFSTOUFS(mp);
597 error = copyin(addr, (caddr_t)&newlim, sizeof (struct dqblk));
600 error = dqget(NULLVP, id, ump, type, &ndq);
604 while (dq->dq_flags & DQ_LOCK) {
605 dq->dq_flags |= DQ_WANT;
606 (void) tsleep((caddr_t)dq, 0, "setqta", 0);
609 * Copy all but the current values.
610 * Reset time limit if previously had no soft limit or were
611 * under it, but now have a soft limit and are over it.
613 newlim.dqb_curblocks = dq->dq_curblocks;
614 newlim.dqb_curinodes = dq->dq_curinodes;
615 if (dq->dq_id != 0) {
616 newlim.dqb_btime = dq->dq_btime;
617 newlim.dqb_itime = dq->dq_itime;
619 if (newlim.dqb_bsoftlimit &&
620 dq->dq_curblocks >= newlim.dqb_bsoftlimit &&
621 (dq->dq_bsoftlimit == 0 || dq->dq_curblocks < dq->dq_bsoftlimit))
622 newlim.dqb_btime = time_second + ump->um_btime[type];
623 if (newlim.dqb_isoftlimit &&
624 dq->dq_curinodes >= newlim.dqb_isoftlimit &&
625 (dq->dq_isoftlimit == 0 || dq->dq_curinodes < dq->dq_isoftlimit))
626 newlim.dqb_itime = time_second + ump->um_itime[type];
628 if (dq->dq_curblocks < dq->dq_bsoftlimit)
629 dq->dq_flags &= ~DQ_BLKS;
630 if (dq->dq_curinodes < dq->dq_isoftlimit)
631 dq->dq_flags &= ~DQ_INODS;
632 if (dq->dq_isoftlimit == 0 && dq->dq_bsoftlimit == 0 &&
633 dq->dq_ihardlimit == 0 && dq->dq_bhardlimit == 0)
634 dq->dq_flags |= DQ_FAKE;
636 dq->dq_flags &= ~DQ_FAKE;
637 dq->dq_flags |= DQ_MOD;
643 * Q_SETUSE - set current inode and block usage.
646 setuse(mp, id, type, addr)
653 struct ufsmount *ump = VFSTOUFS(mp);
658 error = copyin(addr, (caddr_t)&usage, sizeof (struct dqblk));
661 error = dqget(NULLVP, id, ump, type, &ndq);
665 while (dq->dq_flags & DQ_LOCK) {
666 dq->dq_flags |= DQ_WANT;
667 (void) tsleep((caddr_t)dq, 0, "setuse", 0);
670 * Reset time limit if have a soft limit and were
671 * previously under it, but are now over it.
673 if (dq->dq_bsoftlimit && dq->dq_curblocks < dq->dq_bsoftlimit &&
674 usage.dqb_curblocks >= dq->dq_bsoftlimit)
675 dq->dq_btime = time_second + ump->um_btime[type];
676 if (dq->dq_isoftlimit && dq->dq_curinodes < dq->dq_isoftlimit &&
677 usage.dqb_curinodes >= dq->dq_isoftlimit)
678 dq->dq_itime = time_second + ump->um_itime[type];
679 dq->dq_curblocks = usage.dqb_curblocks;
680 dq->dq_curinodes = usage.dqb_curinodes;
681 if (dq->dq_curblocks < dq->dq_bsoftlimit)
682 dq->dq_flags &= ~DQ_BLKS;
683 if (dq->dq_curinodes < dq->dq_isoftlimit)
684 dq->dq_flags &= ~DQ_INODS;
685 dq->dq_flags |= DQ_MOD;
691 * Q_SYNC - sync quota files to disk.
694 static int qsync_scan(struct mount *mp, struct vnode *vp,
695 lwkt_tokref_t vlock, void *data);
697 qsync(struct mount *mp)
699 struct ufsmount *ump = VFSTOUFS(mp);
700 struct thread *td = curthread; /* XXX */
701 struct scaninfo scaninfo;
705 * Check if the mount point has any quotas.
706 * If not, simply return.
708 for (i = 0; i < MAXQUOTAS; i++)
709 if (ump->um_quotas[i] != NULLVP)
714 * Search vnodes associated with this mount point,
715 * synchronizing any modified dquot structures.
719 while (scaninfo.rescan) {
721 vmntvnodescan(mp, NULL, qsync_scan, &scaninfo);
728 qsync_scan(struct mount *mp, struct vnode *vp,
729 lwkt_tokref_t vlock, void *data)
731 struct scaninfo *info = data;
736 if (vp->v_type == VNON) {
737 lwkt_reltoken(vlock);
740 error = vget(vp, vlock, LK_EXCLUSIVE | LK_NOWAIT | LK_INTERLOCK, info->td);
746 for (i = 0; i < MAXQUOTAS; i++) {
747 dq = VTOI(vp)->i_dquot[i];
748 if (dq != NODQUOT && (dq->dq_flags & DQ_MOD))
756 * Code pertaining to management of the in-core dquot data structures.
758 #define DQHASH(dqvp, id) \
759 (&dqhashtbl[((((intptr_t)(dqvp)) >> 8) + id) & dqhash])
760 static LIST_HEAD(dqhash, dquot) *dqhashtbl;
761 static u_long dqhash;
766 #define DQUOTINC 5 /* minimum free dquots desired */
767 static TAILQ_HEAD(dqfreelist, dquot) dqfreelist;
768 static long numdquot, desireddquot = DQUOTINC;
771 * Initialize the quota system.
777 dqhashtbl = hashinit(desiredvnodes, M_DQUOT, &dqhash);
778 TAILQ_INIT(&dqfreelist);
782 * Obtain a dquot structure for the specified identifier and quota file
783 * reading the information from the file if necessary.
786 dqget(vp, id, ump, type, dqp)
789 struct ufsmount *ump;
793 struct thread *td = curthread; /* XXX */
801 dqvp = ump->um_quotas[type];
802 if (dqvp == NULLVP || (ump->um_qflags[type] & QTF_CLOSING)) {
807 * Check the cache first.
809 dqh = DQHASH(dqvp, id);
810 for (dq = dqh->lh_first; dq; dq = dq->dq_hash.le_next) {
811 if (dq->dq_id != id ||
812 dq->dq_ump->um_quotas[dq->dq_type] != dqvp)
815 * Cache hit with no references. Take
816 * the structure off the free list.
819 TAILQ_REMOVE(&dqfreelist, dq, dq_freelist);
825 * Not in cache, allocate a new one.
827 if (dqfreelist.tqh_first == NODQUOT &&
828 numdquot < MAXQUOTAS * desiredvnodes)
829 desireddquot += DQUOTINC;
830 if (numdquot < desireddquot) {
831 dq = (struct dquot *)malloc(sizeof *dq, M_DQUOT, M_WAITOK);
832 bzero((char *)dq, sizeof *dq);
835 if ((dq = dqfreelist.tqh_first) == NULL) {
840 if (dq->dq_cnt || (dq->dq_flags & DQ_MOD))
841 panic("dqget: free dquot isn't");
842 TAILQ_REMOVE(&dqfreelist, dq, dq_freelist);
843 if (dq->dq_ump != NULL)
844 LIST_REMOVE(dq, dq_hash);
847 * Initialize the contents of the dquot structure.
850 vn_lock(dqvp, NULL, LK_EXCLUSIVE | LK_RETRY, td);
851 LIST_INSERT_HEAD(dqh, dq, dq_hash);
853 dq->dq_flags = DQ_LOCK;
857 auio.uio_iov = &aiov;
859 aiov.iov_base = (caddr_t)&dq->dq_dqb;
860 aiov.iov_len = sizeof (struct dqblk);
861 auio.uio_resid = sizeof (struct dqblk);
862 auio.uio_offset = (off_t)(id * sizeof (struct dqblk));
863 auio.uio_segflg = UIO_SYSSPACE;
864 auio.uio_rw = UIO_READ;
866 error = VOP_READ(dqvp, &auio, 0, ump->um_cred[type]);
867 if (auio.uio_resid == sizeof(struct dqblk) && error == 0)
868 bzero((caddr_t)&dq->dq_dqb, sizeof(struct dqblk));
870 VOP_UNLOCK(dqvp, NULL, 0, td);
871 if (dq->dq_flags & DQ_WANT)
875 * I/O error in reading quota file, release
876 * quota structure and reflect problem to caller.
879 LIST_REMOVE(dq, dq_hash);
885 * Check for no limit to enforce.
886 * Initialize time values if necessary.
888 if (dq->dq_isoftlimit == 0 && dq->dq_bsoftlimit == 0 &&
889 dq->dq_ihardlimit == 0 && dq->dq_bhardlimit == 0)
890 dq->dq_flags |= DQ_FAKE;
891 if (dq->dq_id != 0) {
892 if (dq->dq_btime == 0)
893 dq->dq_btime = time_second + ump->um_btime[type];
894 if (dq->dq_itime == 0)
895 dq->dq_itime = time_second + ump->um_itime[type];
903 * Obtain a reference to a dquot.
915 * Release a reference to a dquot.
925 if (dq->dq_cnt > 1) {
929 if (dq->dq_flags & DQ_MOD)
930 (void) dqsync(vp, dq);
931 if (--dq->dq_cnt > 0)
933 TAILQ_INSERT_TAIL(&dqfreelist, dq, dq_freelist);
937 * Update the disk quota in the quota file.
940 dqsync(struct vnode *vp, struct dquot *dq)
942 struct thread *td = curthread; /* XXX */
949 panic("dqsync: dquot");
950 if ((dq->dq_flags & DQ_MOD) == 0)
952 if ((dqvp = dq->dq_ump->um_quotas[dq->dq_type]) == NULLVP)
953 panic("dqsync: file");
955 vn_lock(dqvp, NULL, LK_EXCLUSIVE | LK_RETRY, td);
956 while (dq->dq_flags & DQ_LOCK) {
957 dq->dq_flags |= DQ_WANT;
958 (void) tsleep((caddr_t)dq, 0, "dqsync", 0);
959 if ((dq->dq_flags & DQ_MOD) == 0) {
961 VOP_UNLOCK(dqvp, NULL, 0, td);
965 dq->dq_flags |= DQ_LOCK;
966 auio.uio_iov = &aiov;
968 aiov.iov_base = (caddr_t)&dq->dq_dqb;
969 aiov.iov_len = sizeof (struct dqblk);
970 auio.uio_resid = sizeof (struct dqblk);
971 auio.uio_offset = (off_t)(dq->dq_id * sizeof (struct dqblk));
972 auio.uio_segflg = UIO_SYSSPACE;
973 auio.uio_rw = UIO_WRITE;
975 error = VOP_WRITE(dqvp, &auio, 0, dq->dq_ump->um_cred[dq->dq_type]);
976 if (auio.uio_resid && error == 0)
978 if (dq->dq_flags & DQ_WANT)
980 dq->dq_flags &= ~(DQ_MOD|DQ_LOCK|DQ_WANT);
982 VOP_UNLOCK(dqvp, NULL, 0, td);
987 * Flush all entries from the cache for a particular vnode.
993 struct dquot *dq, *nextdq;
997 * Move all dquot's that used to refer to this quota
998 * file off their hash chains (they will eventually
999 * fall off the head of the free list and be re-used).
1001 for (dqh = &dqhashtbl[dqhash]; dqh >= dqhashtbl; dqh--) {
1002 for (dq = dqh->lh_first; dq; dq = nextdq) {
1003 nextdq = dq->dq_hash.le_next;
1004 if (dq->dq_ump->um_quotas[dq->dq_type] != vp)
1007 panic("dqflush: stray dquot");
1008 LIST_REMOVE(dq, dq_hash);
1009 dq->dq_ump = (struct ufsmount *)0;