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
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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
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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
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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)
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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 1.20 2006/05/05 21:15:10 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/nlookup.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 ufs_chkdqchg (struct inode *, long, struct ucred *, int);
64 static int ufs_chkiqchg (struct inode *, long, struct ucred *, int);
65 static int ufs_dqget (struct vnode *,
66 u_long, struct ufsmount *, int, struct ufs_dquot **);
67 static int ufs_dqsync (struct vnode *, struct ufs_dquot *);
68 static void ufs_dqflush (struct vnode *);
71 static void ufs_dqref (struct ufs_dquot *);
72 static void ufs_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.
84 ufs_getinoquota(struct inode *ip)
87 struct vnode *vp = ITOV(ip);
90 ump = VFSTOUFS(vp->v_mount);
92 * Set up the user quota based on file uid.
93 * EINVAL means that quotas are not enabled.
95 if (ip->i_dquot[USRQUOTA] == NODQUOT &&
96 (error = ufs_dqget(vp, ip->i_uid, ump, USRQUOTA, &ip->i_dquot[USRQUOTA])) &&
100 * Set up the group quota based on file gid.
101 * EINVAL means that quotas are not enabled.
103 if (ip->i_dquot[GRPQUOTA] == NODQUOT &&
104 (error = ufs_dqget(vp, ip->i_gid, ump, GRPQUOTA, &ip->i_dquot[GRPQUOTA])) &&
111 * Update disk usage, and take corrective action.
114 ufs_chkdq(struct inode *ip, long change, struct ucred *cred, int flags)
116 struct ufs_dquot *dq;
118 int ncurblocks, error;
121 if ((flags & CHOWN) == 0)
127 for (i = 0; i < MAXQUOTAS; i++) {
128 if ((dq = ip->i_dquot[i]) == NODQUOT)
130 while (dq->dq_flags & DQ_LOCK) {
131 dq->dq_flags |= DQ_WANT;
132 (void) tsleep((caddr_t)dq, 0, "chkdq1", 0);
134 ncurblocks = dq->dq_curblocks + change;
136 dq->dq_curblocks = ncurblocks;
138 dq->dq_curblocks = 0;
139 dq->dq_flags &= ~DQ_BLKS;
140 dq->dq_flags |= DQ_MOD;
144 if ((flags & FORCE) == 0 && cred->cr_uid != 0) {
145 for (i = 0; i < MAXQUOTAS; i++) {
146 if ((dq = ip->i_dquot[i]) == NODQUOT)
148 error = ufs_chkdqchg(ip, change, cred, i);
153 for (i = 0; i < MAXQUOTAS; i++) {
154 if ((dq = ip->i_dquot[i]) == NODQUOT)
156 while (dq->dq_flags & DQ_LOCK) {
157 dq->dq_flags |= DQ_WANT;
158 (void) tsleep((caddr_t)dq, 0, "chkdq2", 0);
160 /* Reset timer when crossing soft limit */
161 if (dq->dq_curblocks + change >= dq->dq_bsoftlimit &&
162 dq->dq_curblocks < dq->dq_bsoftlimit)
163 dq->dq_btime = time_second +
164 VFSTOUFS(ITOV(ip)->v_mount)->um_btime[i];
165 dq->dq_curblocks += change;
166 dq->dq_flags |= DQ_MOD;
172 * Check for a valid change to a users allocation.
173 * Issue an error message if appropriate.
176 ufs_chkdqchg(struct inode *ip, long change, struct ucred *cred, int type)
178 struct ufs_dquot *dq = ip->i_dquot[type];
179 long ncurblocks = dq->dq_curblocks + change;
182 * If user would exceed their hard limit, disallow space allocation.
184 if (ncurblocks >= dq->dq_bhardlimit && dq->dq_bhardlimit) {
185 if ((dq->dq_flags & DQ_BLKS) == 0 &&
186 ip->i_uid == cred->cr_uid) {
187 uprintf("\n%s: write failed, %s disk limit reached\n",
188 ITOV(ip)->v_mount->mnt_stat.f_mntfromname,
190 dq->dq_flags |= DQ_BLKS;
195 * If user is over their soft limit for too long, disallow space
196 * allocation. Reset time limit as they cross their soft limit.
198 if (ncurblocks >= dq->dq_bsoftlimit && dq->dq_bsoftlimit) {
199 if (dq->dq_curblocks < dq->dq_bsoftlimit) {
200 dq->dq_btime = time_second +
201 VFSTOUFS(ITOV(ip)->v_mount)->um_btime[type];
202 if (ip->i_uid == cred->cr_uid)
203 uprintf("\n%s: warning, %s %s\n",
204 ITOV(ip)->v_mount->mnt_stat.f_mntfromname,
205 quotatypes[type], "disk quota exceeded");
208 if (time_second > dq->dq_btime) {
209 if ((dq->dq_flags & DQ_BLKS) == 0 &&
210 ip->i_uid == cred->cr_uid) {
211 uprintf("\n%s: write failed, %s %s\n",
212 ITOV(ip)->v_mount->mnt_stat.f_mntfromname,
214 "disk quota exceeded for too long");
215 dq->dq_flags |= DQ_BLKS;
224 * Check the inode limit, applying corrective action.
227 ufs_chkiq(struct inode *ip, long change, struct ucred *cred, int flags)
229 struct ufs_dquot *dq;
231 int ncurinodes, error;
234 if ((flags & CHOWN) == 0)
240 for (i = 0; i < MAXQUOTAS; i++) {
241 if ((dq = ip->i_dquot[i]) == NODQUOT)
243 while (dq->dq_flags & DQ_LOCK) {
244 dq->dq_flags |= DQ_WANT;
245 (void) tsleep((caddr_t)dq, 0, "chkiq1", 0);
247 ncurinodes = dq->dq_curinodes + change;
249 dq->dq_curinodes = ncurinodes;
251 dq->dq_curinodes = 0;
252 dq->dq_flags &= ~DQ_INODS;
253 dq->dq_flags |= DQ_MOD;
257 if ((flags & FORCE) == 0 && cred->cr_uid != 0) {
258 for (i = 0; i < MAXQUOTAS; i++) {
259 if ((dq = ip->i_dquot[i]) == NODQUOT)
261 error = ufs_chkiqchg(ip, change, cred, i);
266 for (i = 0; i < MAXQUOTAS; i++) {
267 if ((dq = ip->i_dquot[i]) == NODQUOT)
269 while (dq->dq_flags & DQ_LOCK) {
270 dq->dq_flags |= DQ_WANT;
271 (void) tsleep((caddr_t)dq, 0, "chkiq2", 0);
273 /* Reset timer when crossing soft limit */
274 if (dq->dq_curinodes + change >= dq->dq_isoftlimit &&
275 dq->dq_curinodes < dq->dq_isoftlimit)
276 dq->dq_itime = time_second +
277 VFSTOUFS(ITOV(ip)->v_mount)->um_itime[i];
278 dq->dq_curinodes += change;
279 dq->dq_flags |= DQ_MOD;
285 * Check for a valid change to a users allocation.
286 * Issue an error message if appropriate.
289 ufs_chkiqchg(struct inode *ip, long change, struct ucred *cred, int type)
291 struct ufs_dquot *dq = ip->i_dquot[type];
292 long ncurinodes = dq->dq_curinodes + change;
295 * If user would exceed their hard limit, disallow inode allocation.
297 if (ncurinodes >= dq->dq_ihardlimit && dq->dq_ihardlimit) {
298 if ((dq->dq_flags & DQ_INODS) == 0 &&
299 ip->i_uid == cred->cr_uid) {
300 uprintf("\n%s: write failed, %s inode limit reached\n",
301 ITOV(ip)->v_mount->mnt_stat.f_mntfromname,
303 dq->dq_flags |= DQ_INODS;
308 * If user is over their soft limit for too long, disallow inode
309 * allocation. Reset time limit as they cross their soft limit.
311 if (ncurinodes >= dq->dq_isoftlimit && dq->dq_isoftlimit) {
312 if (dq->dq_curinodes < dq->dq_isoftlimit) {
313 dq->dq_itime = time_second +
314 VFSTOUFS(ITOV(ip)->v_mount)->um_itime[type];
315 if (ip->i_uid == cred->cr_uid)
316 uprintf("\n%s: warning, %s %s\n",
317 ITOV(ip)->v_mount->mnt_stat.f_mntfromname,
318 quotatypes[type], "inode quota exceeded");
321 if (time_second > dq->dq_itime) {
322 if ((dq->dq_flags & DQ_INODS) == 0 &&
323 ip->i_uid == cred->cr_uid) {
324 uprintf("\n%s: write failed, %s %s\n",
325 ITOV(ip)->v_mount->mnt_stat.f_mntfromname,
327 "inode quota exceeded for too long");
328 dq->dq_flags |= DQ_INODS;
338 * On filesystems with quotas enabled, it is an error for a file to change
339 * size and not to have a dquot structure associated with it.
342 ufs_chkdquot(struct inode *ip)
344 struct ufsmount *ump = VFSTOUFS(ITOV(ip)->v_mount);
347 for (i = 0; i < MAXQUOTAS; i++) {
348 if (ump->um_quotas[i] == NULLVP ||
349 (ump->um_qflags[i] & (QTF_OPENING|QTF_CLOSING)))
351 if (ip->i_dquot[i] == NODQUOT) {
352 vprint("chkdquot: missing dquot", ITOV(ip));
353 panic("chkdquot: missing dquot");
360 * Code to process quotactl commands.
370 * Q_QUOTAON - set up a quota file for a particular filesystem.
372 static int ufs_quotaon_scan(struct mount *mp, struct vnode *vp, void *data);
375 ufs_quotaon(struct thread *td, struct mount *mp, int type, caddr_t fname)
377 struct ufsmount *ump = VFSTOUFS(mp);
378 struct vnode *vp, **vpp;
379 struct ufs_dquot *dq;
381 struct nlookupdata nd;
383 struct scaninfo scaninfo;
385 KKASSERT(td->td_proc);
386 cred = td->td_proc->p_ucred;
388 vpp = &ump->um_quotas[type];
389 error = nlookup_init(&nd, fname, UIO_USERSPACE, NLC_FOLLOW|NLC_LOCKVP);
391 error = vn_open(&nd, NULL, FREAD|FWRITE, 0);
392 if (error == 0 && nd.nl_open_vp->v_type != VREG)
399 nd.nl_open_vp = NULL;
404 ufs_quotaoff(td, mp, type);
405 ump->um_qflags[type] |= QTF_OPENING;
406 mp->mnt_flag |= MNT_QUOTA;
407 vp->v_flag |= VSYSTEM;
409 /* XXX release duplicate vp if *vpp == vp? */
411 * Save the credential of the process that turned on quotas.
412 * Set up the time limits for this quota.
414 ump->um_cred[type] = crhold(cred);
415 ump->um_btime[type] = MAX_DQ_TIME;
416 ump->um_itime[type] = MAX_IQ_TIME;
417 if (ufs_dqget(NULLVP, 0, ump, type, &dq) == 0) {
418 if (dq->dq_btime > 0)
419 ump->um_btime[type] = dq->dq_btime;
420 if (dq->dq_itime > 0)
421 ump->um_itime[type] = dq->dq_itime;
422 ufs_dqrele(NULLVP, dq);
425 * Search vnodes associated with this mount point,
426 * adding references to quota file being opened.
427 * NB: only need to add dquot's for inodes being modified.
431 while (scaninfo.rescan) {
433 error = vmntvnodescan(mp, VMSC_GETVP,
434 NULL, ufs_quotaon_scan, &scaninfo);
438 ump->um_qflags[type] &= ~QTF_OPENING;
440 ufs_quotaoff(td, mp, type);
445 ufs_quotaon_scan(struct mount *mp, struct vnode *vp, void *data)
448 /*struct scaninfo *info = data;*/
450 if (vp->v_writecount == 0)
452 error = ufs_getinoquota(VTOI(vp));
457 * Q_QUOTAOFF - turn off disk quotas for a filesystem.
460 static int ufs_quotaoff_scan(struct mount *mp, struct vnode *vp, void *data);
463 ufs_quotaoff(struct thread *td, struct mount *mp, int type)
466 struct ufsmount *ump = VFSTOUFS(mp);
469 struct scaninfo scaninfo;
471 KKASSERT(td->td_proc);
472 cred = td->td_proc->p_ucred;
474 if ((qvp = ump->um_quotas[type]) == NULLVP)
476 ump->um_qflags[type] |= QTF_CLOSING;
479 * Search vnodes associated with this mount point,
480 * deleting any references to quota file being closed.
484 scaninfo.type = type;
485 while (scaninfo.rescan) {
487 vmntvnodescan(mp, VMSC_GETVP, NULL, ufs_quotaoff_scan, &scaninfo);
490 qvp->v_flag &= ~VSYSTEM;
491 error = vn_close(qvp, FREAD|FWRITE, td);
492 ump->um_quotas[type] = NULLVP;
493 crfree(ump->um_cred[type]);
494 ump->um_cred[type] = NOCRED;
495 ump->um_qflags[type] &= ~QTF_CLOSING;
496 for (type = 0; type < MAXQUOTAS; type++) {
497 if (ump->um_quotas[type] != NULLVP)
500 if (type == MAXQUOTAS)
501 mp->mnt_flag &= ~MNT_QUOTA;
506 ufs_quotaoff_scan(struct mount *mp, struct vnode *vp, void *data)
508 struct scaninfo *info = data;
509 struct ufs_dquot *dq;
512 if (vp->v_type == VNON) {
516 dq = ip->i_dquot[info->type];
517 ip->i_dquot[info->type] = NODQUOT;
523 * Q_GETQUOTA - return current values in a dqblk structure.
526 ufs_getquota(struct mount *mp, u_long id, int type, caddr_t addr)
528 struct ufs_dquot *dq;
531 error = ufs_dqget(NULLVP, id, VFSTOUFS(mp), type, &dq);
534 error = copyout((caddr_t)&dq->dq_dqb, addr, sizeof (struct ufs_dqblk));
535 ufs_dqrele(NULLVP, dq);
540 * Q_SETQUOTA - assign an entire dqblk structure.
543 ufs_setquota(struct mount *mp, u_long id, int type, caddr_t addr)
545 struct ufs_dquot *dq;
546 struct ufs_dquot *ndq;
547 struct ufsmount *ump = VFSTOUFS(mp);
548 struct ufs_dqblk newlim;
551 error = copyin(addr, (caddr_t)&newlim, sizeof (struct ufs_dqblk));
554 error = ufs_dqget(NULLVP, id, ump, type, &ndq);
558 while (dq->dq_flags & DQ_LOCK) {
559 dq->dq_flags |= DQ_WANT;
560 (void) tsleep((caddr_t)dq, 0, "setqta", 0);
563 * Copy all but the current values.
564 * Reset time limit if previously had no soft limit or were
565 * under it, but now have a soft limit and are over it.
567 newlim.dqb_curblocks = dq->dq_curblocks;
568 newlim.dqb_curinodes = dq->dq_curinodes;
569 if (dq->dq_id != 0) {
570 newlim.dqb_btime = dq->dq_btime;
571 newlim.dqb_itime = dq->dq_itime;
573 if (newlim.dqb_bsoftlimit &&
574 dq->dq_curblocks >= newlim.dqb_bsoftlimit &&
575 (dq->dq_bsoftlimit == 0 || dq->dq_curblocks < dq->dq_bsoftlimit))
576 newlim.dqb_btime = time_second + ump->um_btime[type];
577 if (newlim.dqb_isoftlimit &&
578 dq->dq_curinodes >= newlim.dqb_isoftlimit &&
579 (dq->dq_isoftlimit == 0 || dq->dq_curinodes < dq->dq_isoftlimit))
580 newlim.dqb_itime = time_second + ump->um_itime[type];
582 if (dq->dq_curblocks < dq->dq_bsoftlimit)
583 dq->dq_flags &= ~DQ_BLKS;
584 if (dq->dq_curinodes < dq->dq_isoftlimit)
585 dq->dq_flags &= ~DQ_INODS;
586 if (dq->dq_isoftlimit == 0 && dq->dq_bsoftlimit == 0 &&
587 dq->dq_ihardlimit == 0 && dq->dq_bhardlimit == 0)
588 dq->dq_flags |= DQ_FAKE;
590 dq->dq_flags &= ~DQ_FAKE;
591 dq->dq_flags |= DQ_MOD;
592 ufs_dqrele(NULLVP, dq);
597 * Q_SETUSE - set current inode and block usage.
600 ufs_setuse(struct mount *mp, u_long id, int type, caddr_t addr)
602 struct ufs_dquot *dq;
603 struct ufsmount *ump = VFSTOUFS(mp);
604 struct ufs_dquot *ndq;
605 struct ufs_dqblk usage;
608 error = copyin(addr, (caddr_t)&usage, sizeof (struct ufs_dqblk));
611 error = ufs_dqget(NULLVP, id, ump, type, &ndq);
615 while (dq->dq_flags & DQ_LOCK) {
616 dq->dq_flags |= DQ_WANT;
617 (void) tsleep((caddr_t)dq, 0, "setuse", 0);
620 * Reset time limit if have a soft limit and were
621 * previously under it, but are now over it.
623 if (dq->dq_bsoftlimit && dq->dq_curblocks < dq->dq_bsoftlimit &&
624 usage.dqb_curblocks >= dq->dq_bsoftlimit)
625 dq->dq_btime = time_second + ump->um_btime[type];
626 if (dq->dq_isoftlimit && dq->dq_curinodes < dq->dq_isoftlimit &&
627 usage.dqb_curinodes >= dq->dq_isoftlimit)
628 dq->dq_itime = time_second + ump->um_itime[type];
629 dq->dq_curblocks = usage.dqb_curblocks;
630 dq->dq_curinodes = usage.dqb_curinodes;
631 if (dq->dq_curblocks < dq->dq_bsoftlimit)
632 dq->dq_flags &= ~DQ_BLKS;
633 if (dq->dq_curinodes < dq->dq_isoftlimit)
634 dq->dq_flags &= ~DQ_INODS;
635 dq->dq_flags |= DQ_MOD;
636 ufs_dqrele(NULLVP, dq);
641 * Q_SYNC - sync quota files to disk.
644 static int ufs_qsync_scan(struct mount *mp, struct vnode *vp, void *data);
647 ufs_qsync(struct mount *mp)
649 struct ufsmount *ump = VFSTOUFS(mp);
650 struct thread *td = curthread; /* XXX */
651 struct scaninfo scaninfo;
655 * Check if the mount point has any quotas.
656 * If not, simply return.
658 for (i = 0; i < MAXQUOTAS; i++)
659 if (ump->um_quotas[i] != NULLVP)
664 * Search vnodes associated with this mount point,
665 * synchronizing any modified ufs_dquot structures.
669 while (scaninfo.rescan) {
671 vmntvnodescan(mp, VMSC_GETVP|VMSC_NOWAIT,
672 NULL, ufs_qsync_scan, &scaninfo);
678 ufs_qsync_scan(struct mount *mp, struct vnode *vp, void *data)
680 /*struct scaninfo *info = data;*/
681 struct ufs_dquot *dq;
685 for (i = 0; i < MAXQUOTAS; i++) {
686 dq = VTOI(vp)->i_dquot[i];
687 if (dq != NODQUOT && (dq->dq_flags & DQ_MOD))
694 * Code pertaining to management of the in-core dquot data structures.
696 #define DQHASH(dqvp, id) \
697 (&ufs_dqhashtbl[((((intptr_t)(dqvp)) >> 8) + id) & ufs_dqhash])
698 static LIST_HEAD(ufs_dqhash, ufs_dquot) *ufs_dqhashtbl;
699 static u_long ufs_dqhash;
704 #define DQUOTINC 5 /* minimum free dquots desired */
705 static TAILQ_HEAD(ufs_dqfreelist, ufs_dquot) ufs_dqfreelist;
706 static long ufs_numdquot, ufs_desireddquot = DQUOTINC;
709 * Initialize the quota system.
714 ufs_dqhashtbl = hashinit(desiredvnodes, M_DQUOT, &ufs_dqhash);
715 TAILQ_INIT(&ufs_dqfreelist);
719 * Obtain a dquot structure for the specified identifier and quota file
720 * reading the information from the file if necessary.
723 ufs_dqget(struct vnode *vp, u_long id, struct ufsmount *ump, int type,
724 struct ufs_dquot **dqp)
726 struct ufs_dquot *dq;
727 struct ufs_dqhash *dqh;
733 dqvp = ump->um_quotas[type];
734 if (dqvp == NULLVP || (ump->um_qflags[type] & QTF_CLOSING)) {
739 * Check the cache first.
741 dqh = DQHASH(dqvp, id);
742 for (dq = dqh->lh_first; dq; dq = dq->dq_hash.le_next) {
743 if (dq->dq_id != id ||
744 dq->dq_ump->um_quotas[dq->dq_type] != dqvp)
747 * Cache hit with no references. Take
748 * the structure off the free list.
751 TAILQ_REMOVE(&ufs_dqfreelist, dq, dq_freelist);
757 * Not in cache, allocate a new one.
759 if (TAILQ_EMPTY(&ufs_dqfreelist) && ufs_numdquot < MAXQUOTAS * desiredvnodes)
760 ufs_desireddquot += DQUOTINC;
761 if (ufs_numdquot < ufs_desireddquot) {
762 dq = (struct ufs_dquot *)malloc(sizeof *dq, M_DQUOT, M_WAITOK);
763 bzero((char *)dq, sizeof *dq);
766 if ((dq = TAILQ_FIRST(&ufs_dqfreelist)) == NULL) {
771 if (dq->dq_cnt || (dq->dq_flags & DQ_MOD))
772 panic("dqget: free dquot isn't");
773 TAILQ_REMOVE(&ufs_dqfreelist, dq, dq_freelist);
774 if (dq->dq_ump != NULL)
775 LIST_REMOVE(dq, dq_hash);
778 * Initialize the contents of the dquot structure.
781 vn_lock(dqvp, LK_EXCLUSIVE | LK_RETRY);
782 LIST_INSERT_HEAD(dqh, dq, dq_hash);
784 dq->dq_flags = DQ_LOCK;
788 auio.uio_iov = &aiov;
790 aiov.iov_base = (caddr_t)&dq->dq_dqb;
791 aiov.iov_len = sizeof (struct ufs_dqblk);
792 auio.uio_resid = sizeof (struct ufs_dqblk);
793 auio.uio_offset = (off_t)(id * sizeof (struct ufs_dqblk));
794 auio.uio_segflg = UIO_SYSSPACE;
795 auio.uio_rw = UIO_READ;
797 error = VOP_READ(dqvp, &auio, 0, ump->um_cred[type]);
798 if (auio.uio_resid == sizeof(struct ufs_dqblk) && error == 0)
799 bzero((caddr_t)&dq->dq_dqb, sizeof(struct ufs_dqblk));
802 if (dq->dq_flags & DQ_WANT)
806 * I/O error in reading quota file, release
807 * quota structure and reflect problem to caller.
810 LIST_REMOVE(dq, dq_hash);
816 * Check for no limit to enforce.
817 * Initialize time values if necessary.
819 if (dq->dq_isoftlimit == 0 && dq->dq_bsoftlimit == 0 &&
820 dq->dq_ihardlimit == 0 && dq->dq_bhardlimit == 0)
821 dq->dq_flags |= DQ_FAKE;
822 if (dq->dq_id != 0) {
823 if (dq->dq_btime == 0)
824 dq->dq_btime = time_second + ump->um_btime[type];
825 if (dq->dq_itime == 0)
826 dq->dq_itime = time_second + ump->um_itime[type];
834 * Obtain a reference to a dquot.
837 ufs_dqref(struct ufs_dquot *dq)
844 * Release a reference to a dquot.
847 ufs_dqrele(struct vnode *vp, struct ufs_dquot *dq)
851 if (dq->dq_cnt > 1) {
855 if (dq->dq_flags & DQ_MOD)
856 (void)ufs_dqsync(vp, dq);
857 if (--dq->dq_cnt > 0)
859 TAILQ_INSERT_TAIL(&ufs_dqfreelist, dq, dq_freelist);
863 * Update the disk quota in the quota file.
866 ufs_dqsync(struct vnode *vp, struct ufs_dquot *dq)
874 panic("dqsync: dquot");
875 if ((dq->dq_flags & DQ_MOD) == 0)
877 if ((dqvp = dq->dq_ump->um_quotas[dq->dq_type]) == NULLVP)
878 panic("dqsync: file");
880 vn_lock(dqvp, LK_EXCLUSIVE | LK_RETRY);
881 while (dq->dq_flags & DQ_LOCK) {
882 dq->dq_flags |= DQ_WANT;
883 (void) tsleep((caddr_t)dq, 0, "dqsync", 0);
884 if ((dq->dq_flags & DQ_MOD) == 0) {
890 dq->dq_flags |= DQ_LOCK;
891 auio.uio_iov = &aiov;
893 aiov.iov_base = (caddr_t)&dq->dq_dqb;
894 aiov.iov_len = sizeof (struct ufs_dqblk);
895 auio.uio_resid = sizeof (struct ufs_dqblk);
896 auio.uio_offset = (off_t)(dq->dq_id * sizeof (struct ufs_dqblk));
897 auio.uio_segflg = UIO_SYSSPACE;
898 auio.uio_rw = UIO_WRITE;
900 error = VOP_WRITE(dqvp, &auio, 0, dq->dq_ump->um_cred[dq->dq_type]);
901 if (auio.uio_resid && error == 0)
903 if (dq->dq_flags & DQ_WANT)
905 dq->dq_flags &= ~(DQ_MOD|DQ_LOCK|DQ_WANT);
912 * Flush all entries from the cache for a particular vnode.
915 ufs_dqflush(struct vnode *vp)
917 struct ufs_dquot *dq, *nextdq;
918 struct ufs_dqhash *dqh;
921 * Move all dquot's that used to refer to this quota
922 * file off their hash chains (they will eventually
923 * fall off the head of the free list and be re-used).
925 for (dqh = &ufs_dqhashtbl[ufs_dqhash]; dqh >= ufs_dqhashtbl; dqh--) {
926 for (dq = dqh->lh_first; dq; dq = nextdq) {
927 nextdq = dq->dq_hash.le_next;
928 if (dq->dq_ump->um_quotas[dq->dq_type] != vp)
931 panic("dqflush: stray dquot");
932 LIST_REMOVE(dq, dq_hash);
933 dq->dq_ump = (struct ufsmount *)0;