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.
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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.
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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.
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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 1.14 2004/07/18 19:43:48 drhodus 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.
84 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 &&
97 dqget(vp, ip->i_uid, ump, USRQUOTA, &ip->i_dquot[USRQUOTA])) &&
101 * Set up the group quota based on file gid.
102 * EINVAL means that quotas are not enabled.
104 if (ip->i_dquot[GRPQUOTA] == NODQUOT &&
106 dqget(vp, ip->i_gid, ump, GRPQUOTA, &ip->i_dquot[GRPQUOTA])) &&
113 * Update disk usage, and take corrective action.
116 chkdq(struct inode *ip, long change, struct ucred *cred, int flags)
120 int ncurblocks, error;
123 if ((flags & CHOWN) == 0)
129 for (i = 0; i < MAXQUOTAS; i++) {
130 if ((dq = ip->i_dquot[i]) == NODQUOT)
132 while (dq->dq_flags & DQ_LOCK) {
133 dq->dq_flags |= DQ_WANT;
134 (void) tsleep((caddr_t)dq, 0, "chkdq1", 0);
136 ncurblocks = dq->dq_curblocks + change;
138 dq->dq_curblocks = ncurblocks;
140 dq->dq_curblocks = 0;
141 dq->dq_flags &= ~DQ_BLKS;
142 dq->dq_flags |= DQ_MOD;
146 if ((flags & FORCE) == 0 && cred->cr_uid != 0) {
147 for (i = 0; i < MAXQUOTAS; i++) {
148 if ((dq = ip->i_dquot[i]) == NODQUOT)
150 error = chkdqchg(ip, change, cred, i);
155 for (i = 0; i < MAXQUOTAS; i++) {
156 if ((dq = ip->i_dquot[i]) == NODQUOT)
158 while (dq->dq_flags & DQ_LOCK) {
159 dq->dq_flags |= DQ_WANT;
160 (void) tsleep((caddr_t)dq, 0, "chkdq2", 0);
162 /* Reset timer when crossing soft limit */
163 if (dq->dq_curblocks + change >= dq->dq_bsoftlimit &&
164 dq->dq_curblocks < dq->dq_bsoftlimit)
165 dq->dq_btime = time_second +
166 VFSTOUFS(ITOV(ip)->v_mount)->um_btime[i];
167 dq->dq_curblocks += change;
168 dq->dq_flags |= DQ_MOD;
174 * Check for a valid change to a users allocation.
175 * Issue an error message if appropriate.
178 chkdqchg(struct inode *ip, long change, struct ucred *cred, int type)
180 struct dquot *dq = ip->i_dquot[type];
181 long ncurblocks = dq->dq_curblocks + change;
184 * If user would exceed their hard limit, disallow space allocation.
186 if (ncurblocks >= dq->dq_bhardlimit && dq->dq_bhardlimit) {
187 if ((dq->dq_flags & DQ_BLKS) == 0 &&
188 ip->i_uid == cred->cr_uid) {
189 uprintf("\n%s: write failed, %s disk limit reached\n",
190 ITOV(ip)->v_mount->mnt_stat.f_mntonname,
192 dq->dq_flags |= DQ_BLKS;
197 * If user is over their soft limit for too long, disallow space
198 * allocation. Reset time limit as they cross their soft limit.
200 if (ncurblocks >= dq->dq_bsoftlimit && dq->dq_bsoftlimit) {
201 if (dq->dq_curblocks < dq->dq_bsoftlimit) {
202 dq->dq_btime = time_second +
203 VFSTOUFS(ITOV(ip)->v_mount)->um_btime[type];
204 if (ip->i_uid == cred->cr_uid)
205 uprintf("\n%s: warning, %s %s\n",
206 ITOV(ip)->v_mount->mnt_stat.f_mntonname,
207 quotatypes[type], "disk quota exceeded");
210 if (time_second > dq->dq_btime) {
211 if ((dq->dq_flags & DQ_BLKS) == 0 &&
212 ip->i_uid == cred->cr_uid) {
213 uprintf("\n%s: write failed, %s %s\n",
214 ITOV(ip)->v_mount->mnt_stat.f_mntonname,
216 "disk quota exceeded for too long");
217 dq->dq_flags |= DQ_BLKS;
226 * Check the inode limit, applying corrective action.
229 chkiq(struct inode *ip, long change, struct ucred *cred, int flags)
233 int ncurinodes, error;
236 if ((flags & CHOWN) == 0)
242 for (i = 0; i < MAXQUOTAS; i++) {
243 if ((dq = ip->i_dquot[i]) == NODQUOT)
245 while (dq->dq_flags & DQ_LOCK) {
246 dq->dq_flags |= DQ_WANT;
247 (void) tsleep((caddr_t)dq, 0, "chkiq1", 0);
249 ncurinodes = dq->dq_curinodes + change;
251 dq->dq_curinodes = ncurinodes;
253 dq->dq_curinodes = 0;
254 dq->dq_flags &= ~DQ_INODS;
255 dq->dq_flags |= DQ_MOD;
259 if ((flags & FORCE) == 0 && cred->cr_uid != 0) {
260 for (i = 0; i < MAXQUOTAS; i++) {
261 if ((dq = ip->i_dquot[i]) == NODQUOT)
263 error = chkiqchg(ip, change, cred, i);
268 for (i = 0; i < MAXQUOTAS; i++) {
269 if ((dq = ip->i_dquot[i]) == NODQUOT)
271 while (dq->dq_flags & DQ_LOCK) {
272 dq->dq_flags |= DQ_WANT;
273 (void) tsleep((caddr_t)dq, 0, "chkiq2", 0);
275 /* Reset timer when crossing soft limit */
276 if (dq->dq_curinodes + change >= dq->dq_isoftlimit &&
277 dq->dq_curinodes < dq->dq_isoftlimit)
278 dq->dq_itime = time_second +
279 VFSTOUFS(ITOV(ip)->v_mount)->um_itime[i];
280 dq->dq_curinodes += change;
281 dq->dq_flags |= DQ_MOD;
287 * Check for a valid change to a users allocation.
288 * Issue an error message if appropriate.
291 chkiqchg(struct inode *ip, long change, struct ucred *cred, int type)
293 struct dquot *dq = ip->i_dquot[type];
294 long ncurinodes = dq->dq_curinodes + change;
297 * If user would exceed their hard limit, disallow inode allocation.
299 if (ncurinodes >= dq->dq_ihardlimit && dq->dq_ihardlimit) {
300 if ((dq->dq_flags & DQ_INODS) == 0 &&
301 ip->i_uid == cred->cr_uid) {
302 uprintf("\n%s: write failed, %s inode limit reached\n",
303 ITOV(ip)->v_mount->mnt_stat.f_mntonname,
305 dq->dq_flags |= DQ_INODS;
310 * If user is over their soft limit for too long, disallow inode
311 * allocation. Reset time limit as they cross their soft limit.
313 if (ncurinodes >= dq->dq_isoftlimit && dq->dq_isoftlimit) {
314 if (dq->dq_curinodes < dq->dq_isoftlimit) {
315 dq->dq_itime = time_second +
316 VFSTOUFS(ITOV(ip)->v_mount)->um_itime[type];
317 if (ip->i_uid == cred->cr_uid)
318 uprintf("\n%s: warning, %s %s\n",
319 ITOV(ip)->v_mount->mnt_stat.f_mntonname,
320 quotatypes[type], "inode quota exceeded");
323 if (time_second > dq->dq_itime) {
324 if ((dq->dq_flags & DQ_INODS) == 0 &&
325 ip->i_uid == cred->cr_uid) {
326 uprintf("\n%s: write failed, %s %s\n",
327 ITOV(ip)->v_mount->mnt_stat.f_mntonname,
329 "inode quota exceeded for too long");
330 dq->dq_flags |= DQ_INODS;
340 * On filesystems with quotas enabled, it is an error for a file to change
341 * size and not to have a dquot structure associated with it.
344 chkdquot(struct inode *ip)
346 struct ufsmount *ump = VFSTOUFS(ITOV(ip)->v_mount);
349 for (i = 0; i < MAXQUOTAS; i++) {
350 if (ump->um_quotas[i] == NULLVP ||
351 (ump->um_qflags[i] & (QTF_OPENING|QTF_CLOSING)))
353 if (ip->i_dquot[i] == NODQUOT) {
354 vprint("chkdquot: missing dquot", ITOV(ip));
355 panic("chkdquot: missing dquot");
362 * Code to process quotactl commands.
372 * Q_QUOTAON - set up a quota file for a particular filesystem.
374 static int quotaon_scan(struct mount *mp, struct vnode *vp,
375 lwkt_tokref_t vlock, void *data);
378 quotaon(struct thread *td, struct mount *mp, int type, caddr_t fname)
380 struct ufsmount *ump = VFSTOUFS(mp);
381 struct vnode *vp, **vpp;
386 struct scaninfo scaninfo;
388 KKASSERT(td->td_proc);
389 cred = td->td_proc->p_ucred;
391 vpp = &ump->um_quotas[type];
392 NDINIT(&nd, NAMEI_LOOKUP, CNP_FOLLOW, UIO_USERSPACE, fname, td);
393 error = vn_open(&nd, FREAD|FWRITE, 0);
396 NDFREE(&nd, NDF_ONLY_PNBUF);
398 VOP_UNLOCK(vp, NULL, 0, td);
399 if (vp->v_type != VREG) {
400 (void) vn_close(vp, FREAD|FWRITE, td);
404 quotaoff(td, mp, type);
405 ump->um_qflags[type] |= QTF_OPENING;
406 mp->mnt_flag |= MNT_QUOTA;
407 vp->v_flag |= VSYSTEM;
410 * Save the credential of the process that turned on quotas.
411 * Set up the time limits for this quota.
413 ump->um_cred[type] = crhold(cred);
414 ump->um_btime[type] = MAX_DQ_TIME;
415 ump->um_itime[type] = MAX_IQ_TIME;
416 if (dqget(NULLVP, 0, ump, type, &dq) == 0) {
417 if (dq->dq_btime > 0)
418 ump->um_btime[type] = dq->dq_btime;
419 if (dq->dq_itime > 0)
420 ump->um_itime[type] = dq->dq_itime;
424 * Search vnodes associated with this mount point,
425 * adding references to quota file being opened.
426 * NB: only need to add dquot's for inodes being modified.
430 while (scaninfo.rescan) {
432 error = vmntvnodescan(mp, NULL, quotaon_scan, &scaninfo);
436 ump->um_qflags[type] &= ~QTF_OPENING;
438 quotaoff(td, mp, type);
443 quotaon_scan(struct mount *mp, struct vnode *vp,
444 lwkt_tokref_t vlock, void *data)
447 struct scaninfo *info = data;
449 if (vp->v_type == VNON || vp->v_writecount == 0) {
450 lwkt_reltoken(vlock);
453 if (vget(vp, vlock, LK_INTERLOCK|LK_EXCLUSIVE, info->td)) {
457 error = getinoquota(VTOI(vp));
463 * Q_QUOTAOFF - turn off disk quotas for a filesystem.
466 static int quotaoff_scan(struct mount *mp, struct vnode *vp,
467 lwkt_tokref_t vlock, void *data);
470 quotaoff(struct thread *td, struct mount *mp, int type)
473 struct ufsmount *ump = VFSTOUFS(mp);
476 struct scaninfo scaninfo;
478 KKASSERT(td->td_proc);
479 cred = td->td_proc->p_ucred;
481 if ((qvp = ump->um_quotas[type]) == NULLVP)
483 ump->um_qflags[type] |= QTF_CLOSING;
486 * Search vnodes associated with this mount point,
487 * deleting any references to quota file being closed.
491 scaninfo.type = type;
492 while (scaninfo.rescan) {
494 vmntvnodescan(mp, NULL, quotaoff_scan, &scaninfo);
497 qvp->v_flag &= ~VSYSTEM;
498 error = vn_close(qvp, FREAD|FWRITE, td);
499 ump->um_quotas[type] = NULLVP;
500 crfree(ump->um_cred[type]);
501 ump->um_cred[type] = NOCRED;
502 ump->um_qflags[type] &= ~QTF_CLOSING;
503 for (type = 0; type < MAXQUOTAS; type++) {
504 if (ump->um_quotas[type] != NULLVP)
507 if (type == MAXQUOTAS)
508 mp->mnt_flag &= ~MNT_QUOTA;
513 quotaoff_scan(struct mount *mp, struct vnode *vp,
514 lwkt_tokref_t vlock, void *data)
516 struct scaninfo *info = data;
520 if (vp->v_type == VNON) {
521 lwkt_reltoken(vlock);
524 if (vget(vp, vlock, LK_INTERLOCK|LK_EXCLUSIVE, info->td)) {
529 dq = ip->i_dquot[info->type];
530 ip->i_dquot[info->type] = NODQUOT;
537 * Q_GETQUOTA - return current values in a dqblk structure.
540 getquota(struct mount *mp, u_long id, int type, caddr_t addr)
545 error = dqget(NULLVP, id, VFSTOUFS(mp), type, &dq);
548 error = copyout((caddr_t)&dq->dq_dqb, addr, sizeof (struct dqblk));
554 * Q_SETQUOTA - assign an entire dqblk structure.
557 setquota(struct mount *mp, u_long id, int type, caddr_t addr)
561 struct ufsmount *ump = VFSTOUFS(mp);
565 error = copyin(addr, (caddr_t)&newlim, sizeof (struct dqblk));
568 error = dqget(NULLVP, id, ump, type, &ndq);
572 while (dq->dq_flags & DQ_LOCK) {
573 dq->dq_flags |= DQ_WANT;
574 (void) tsleep((caddr_t)dq, 0, "setqta", 0);
577 * Copy all but the current values.
578 * Reset time limit if previously had no soft limit or were
579 * under it, but now have a soft limit and are over it.
581 newlim.dqb_curblocks = dq->dq_curblocks;
582 newlim.dqb_curinodes = dq->dq_curinodes;
583 if (dq->dq_id != 0) {
584 newlim.dqb_btime = dq->dq_btime;
585 newlim.dqb_itime = dq->dq_itime;
587 if (newlim.dqb_bsoftlimit &&
588 dq->dq_curblocks >= newlim.dqb_bsoftlimit &&
589 (dq->dq_bsoftlimit == 0 || dq->dq_curblocks < dq->dq_bsoftlimit))
590 newlim.dqb_btime = time_second + ump->um_btime[type];
591 if (newlim.dqb_isoftlimit &&
592 dq->dq_curinodes >= newlim.dqb_isoftlimit &&
593 (dq->dq_isoftlimit == 0 || dq->dq_curinodes < dq->dq_isoftlimit))
594 newlim.dqb_itime = time_second + ump->um_itime[type];
596 if (dq->dq_curblocks < dq->dq_bsoftlimit)
597 dq->dq_flags &= ~DQ_BLKS;
598 if (dq->dq_curinodes < dq->dq_isoftlimit)
599 dq->dq_flags &= ~DQ_INODS;
600 if (dq->dq_isoftlimit == 0 && dq->dq_bsoftlimit == 0 &&
601 dq->dq_ihardlimit == 0 && dq->dq_bhardlimit == 0)
602 dq->dq_flags |= DQ_FAKE;
604 dq->dq_flags &= ~DQ_FAKE;
605 dq->dq_flags |= DQ_MOD;
611 * Q_SETUSE - set current inode and block usage.
614 setuse(struct mount *mp, u_long id, int type, caddr_t addr)
617 struct ufsmount *ump = VFSTOUFS(mp);
622 error = copyin(addr, (caddr_t)&usage, sizeof (struct dqblk));
625 error = dqget(NULLVP, id, ump, type, &ndq);
629 while (dq->dq_flags & DQ_LOCK) {
630 dq->dq_flags |= DQ_WANT;
631 (void) tsleep((caddr_t)dq, 0, "setuse", 0);
634 * Reset time limit if have a soft limit and were
635 * previously under it, but are now over it.
637 if (dq->dq_bsoftlimit && dq->dq_curblocks < dq->dq_bsoftlimit &&
638 usage.dqb_curblocks >= dq->dq_bsoftlimit)
639 dq->dq_btime = time_second + ump->um_btime[type];
640 if (dq->dq_isoftlimit && dq->dq_curinodes < dq->dq_isoftlimit &&
641 usage.dqb_curinodes >= dq->dq_isoftlimit)
642 dq->dq_itime = time_second + ump->um_itime[type];
643 dq->dq_curblocks = usage.dqb_curblocks;
644 dq->dq_curinodes = usage.dqb_curinodes;
645 if (dq->dq_curblocks < dq->dq_bsoftlimit)
646 dq->dq_flags &= ~DQ_BLKS;
647 if (dq->dq_curinodes < dq->dq_isoftlimit)
648 dq->dq_flags &= ~DQ_INODS;
649 dq->dq_flags |= DQ_MOD;
655 * Q_SYNC - sync quota files to disk.
658 static int qsync_scan(struct mount *mp, struct vnode *vp,
659 lwkt_tokref_t vlock, void *data);
661 qsync(struct mount *mp)
663 struct ufsmount *ump = VFSTOUFS(mp);
664 struct thread *td = curthread; /* XXX */
665 struct scaninfo scaninfo;
669 * Check if the mount point has any quotas.
670 * If not, simply return.
672 for (i = 0; i < MAXQUOTAS; i++)
673 if (ump->um_quotas[i] != NULLVP)
678 * Search vnodes associated with this mount point,
679 * synchronizing any modified dquot structures.
683 while (scaninfo.rescan) {
685 vmntvnodescan(mp, NULL, qsync_scan, &scaninfo);
691 qsync_scan(struct mount *mp, struct vnode *vp,
692 lwkt_tokref_t vlock, void *data)
694 struct scaninfo *info = data;
699 if (vp->v_type == VNON) {
700 lwkt_reltoken(vlock);
703 error = vget(vp, vlock, LK_EXCLUSIVE | LK_NOWAIT | LK_INTERLOCK, info->td);
709 for (i = 0; i < MAXQUOTAS; i++) {
710 dq = VTOI(vp)->i_dquot[i];
711 if (dq != NODQUOT && (dq->dq_flags & DQ_MOD))
719 * Code pertaining to management of the in-core dquot data structures.
721 #define DQHASH(dqvp, id) \
722 (&dqhashtbl[((((intptr_t)(dqvp)) >> 8) + id) & dqhash])
723 static LIST_HEAD(dqhash, dquot) *dqhashtbl;
724 static u_long dqhash;
729 #define DQUOTINC 5 /* minimum free dquots desired */
730 static TAILQ_HEAD(dqfreelist, dquot) dqfreelist;
731 static long numdquot, desireddquot = DQUOTINC;
734 * Initialize the quota system.
740 dqhashtbl = hashinit(desiredvnodes, M_DQUOT, &dqhash);
741 TAILQ_INIT(&dqfreelist);
745 * Obtain a dquot structure for the specified identifier and quota file
746 * reading the information from the file if necessary.
749 dqget(struct vnode *vp, u_long id, struct ufsmount *ump, int type,
752 struct thread *td = curthread; /* XXX */
760 dqvp = ump->um_quotas[type];
761 if (dqvp == NULLVP || (ump->um_qflags[type] & QTF_CLOSING)) {
766 * Check the cache first.
768 dqh = DQHASH(dqvp, id);
769 for (dq = dqh->lh_first; dq; dq = dq->dq_hash.le_next) {
770 if (dq->dq_id != id ||
771 dq->dq_ump->um_quotas[dq->dq_type] != dqvp)
774 * Cache hit with no references. Take
775 * the structure off the free list.
778 TAILQ_REMOVE(&dqfreelist, dq, dq_freelist);
784 * Not in cache, allocate a new one.
786 if (dqfreelist.tqh_first == NODQUOT &&
787 numdquot < MAXQUOTAS * desiredvnodes)
788 desireddquot += DQUOTINC;
789 if (numdquot < desireddquot) {
790 dq = (struct dquot *)malloc(sizeof *dq, M_DQUOT, M_WAITOK);
791 bzero((char *)dq, sizeof *dq);
794 if ((dq = dqfreelist.tqh_first) == NULL) {
799 if (dq->dq_cnt || (dq->dq_flags & DQ_MOD))
800 panic("dqget: free dquot isn't");
801 TAILQ_REMOVE(&dqfreelist, dq, dq_freelist);
802 if (dq->dq_ump != NULL)
803 LIST_REMOVE(dq, dq_hash);
806 * Initialize the contents of the dquot structure.
809 vn_lock(dqvp, NULL, LK_EXCLUSIVE | LK_RETRY, td);
810 LIST_INSERT_HEAD(dqh, dq, dq_hash);
812 dq->dq_flags = DQ_LOCK;
816 auio.uio_iov = &aiov;
818 aiov.iov_base = (caddr_t)&dq->dq_dqb;
819 aiov.iov_len = sizeof (struct dqblk);
820 auio.uio_resid = sizeof (struct dqblk);
821 auio.uio_offset = (off_t)(id * sizeof (struct dqblk));
822 auio.uio_segflg = UIO_SYSSPACE;
823 auio.uio_rw = UIO_READ;
825 error = VOP_READ(dqvp, &auio, 0, ump->um_cred[type]);
826 if (auio.uio_resid == sizeof(struct dqblk) && error == 0)
827 bzero((caddr_t)&dq->dq_dqb, sizeof(struct dqblk));
829 VOP_UNLOCK(dqvp, NULL, 0, td);
830 if (dq->dq_flags & DQ_WANT)
834 * I/O error in reading quota file, release
835 * quota structure and reflect problem to caller.
838 LIST_REMOVE(dq, dq_hash);
844 * Check for no limit to enforce.
845 * Initialize time values if necessary.
847 if (dq->dq_isoftlimit == 0 && dq->dq_bsoftlimit == 0 &&
848 dq->dq_ihardlimit == 0 && dq->dq_bhardlimit == 0)
849 dq->dq_flags |= DQ_FAKE;
850 if (dq->dq_id != 0) {
851 if (dq->dq_btime == 0)
852 dq->dq_btime = time_second + ump->um_btime[type];
853 if (dq->dq_itime == 0)
854 dq->dq_itime = time_second + ump->um_itime[type];
862 * Obtain a reference to a dquot.
865 dqref(struct dquot *dq)
872 * Release a reference to a dquot.
875 dqrele(struct vnode *vp, struct dquot *dq)
879 if (dq->dq_cnt > 1) {
883 if (dq->dq_flags & DQ_MOD)
884 (void) dqsync(vp, dq);
885 if (--dq->dq_cnt > 0)
887 TAILQ_INSERT_TAIL(&dqfreelist, dq, dq_freelist);
891 * Update the disk quota in the quota file.
894 dqsync(struct vnode *vp, struct dquot *dq)
896 struct thread *td = curthread; /* XXX */
903 panic("dqsync: dquot");
904 if ((dq->dq_flags & DQ_MOD) == 0)
906 if ((dqvp = dq->dq_ump->um_quotas[dq->dq_type]) == NULLVP)
907 panic("dqsync: file");
909 vn_lock(dqvp, NULL, LK_EXCLUSIVE | LK_RETRY, td);
910 while (dq->dq_flags & DQ_LOCK) {
911 dq->dq_flags |= DQ_WANT;
912 (void) tsleep((caddr_t)dq, 0, "dqsync", 0);
913 if ((dq->dq_flags & DQ_MOD) == 0) {
915 VOP_UNLOCK(dqvp, NULL, 0, td);
919 dq->dq_flags |= DQ_LOCK;
920 auio.uio_iov = &aiov;
922 aiov.iov_base = (caddr_t)&dq->dq_dqb;
923 aiov.iov_len = sizeof (struct dqblk);
924 auio.uio_resid = sizeof (struct dqblk);
925 auio.uio_offset = (off_t)(dq->dq_id * sizeof (struct dqblk));
926 auio.uio_segflg = UIO_SYSSPACE;
927 auio.uio_rw = UIO_WRITE;
929 error = VOP_WRITE(dqvp, &auio, 0, dq->dq_ump->um_cred[dq->dq_type]);
930 if (auio.uio_resid && error == 0)
932 if (dq->dq_flags & DQ_WANT)
934 dq->dq_flags &= ~(DQ_MOD|DQ_LOCK|DQ_WANT);
936 VOP_UNLOCK(dqvp, NULL, 0, td);
941 * Flush all entries from the cache for a particular vnode.
944 dqflush(struct vnode *vp)
946 struct dquot *dq, *nextdq;
950 * Move all dquot's that used to refer to this quota
951 * file off their hash chains (they will eventually
952 * fall off the head of the free list and be re-used).
954 for (dqh = &dqhashtbl[dqhash]; dqh >= dqhashtbl; dqh--) {
955 for (dq = dqh->lh_first; dq; dq = nextdq) {
956 nextdq = dq->dq_hash.le_next;
957 if (dq->dq_ump->um_quotas[dq->dq_type] != vp)
960 panic("dqflush: stray dquot");
961 LIST_REMOVE(dq, dq_hash);
962 dq->dq_ump = (struct ufsmount *)0;