2 * SPDX-License-Identifier: BSD-3-Clause
4 * Copyright (c) 1982, 1986, 1990, 1993, 1995
5 * The Regents of the University of California. All rights reserved.
7 * This code is derived from software contributed to Berkeley by
8 * Robert Elz at The University of Melbourne.
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11 * modification, are permitted provided that the following conditions
13 * 1. Redistributions of source code must retain the above copyright
14 * notice, this list of conditions and the following disclaimer.
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19 * may be used to endorse or promote products derived from this software
20 * without specific prior written permission.
22 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
25 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
34 * @(#)ufs_quota.c 8.5 (Berkeley) 5/20/95
37 #include <sys/cdefs.h>
38 __FBSDID("$FreeBSD$");
42 #include <sys/param.h>
43 #include <sys/systm.h>
44 #include <sys/endian.h>
45 #include <sys/fcntl.h>
46 #include <sys/kernel.h>
48 #include <sys/malloc.h>
49 #include <sys/mount.h>
50 #include <sys/mutex.h>
51 #include <sys/namei.h>
54 #include <sys/socket.h>
56 #include <sys/sysctl.h>
57 #include <sys/vnode.h>
59 #include <ufs/ufs/extattr.h>
60 #include <ufs/ufs/quota.h>
61 #include <ufs/ufs/inode.h>
62 #include <ufs/ufs/ufsmount.h>
63 #include <ufs/ufs/ufs_extern.h>
65 CTASSERT(sizeof(struct dqblk64) == sizeof(struct dqhdr64));
67 static int unprivileged_get_quota = 0;
68 SYSCTL_INT(_security_bsd, OID_AUTO, unprivileged_get_quota, CTLFLAG_RW,
69 &unprivileged_get_quota, 0,
70 "Unprivileged processes may retrieve quotas for other uids and gids");
72 static MALLOC_DEFINE(M_DQUOT, "ufs_quota", "UFS quota entries");
75 * Quota name to error message mapping.
77 static char *quotatypes[] = INITQFNAMES;
79 static int chkdqchg(struct inode *, ufs2_daddr_t, struct ucred *, int, int *);
80 static int chkiqchg(struct inode *, int, struct ucred *, int, int *);
81 static int dqopen(struct vnode *, struct ufsmount *, int);
82 static int dqget(struct vnode *,
83 u_long, struct ufsmount *, int, struct dquot **);
84 static int dqsync(struct vnode *, struct dquot *);
85 static int dqflush(struct vnode *);
86 static int quotaoff1(struct thread *td, struct mount *mp, int type);
87 static int quotaoff_inchange(struct thread *td, struct mount *mp, int type);
89 /* conversion functions - from_to() */
90 static void dqb32_dq(const struct dqblk32 *, struct dquot *);
91 static void dqb64_dq(const struct dqblk64 *, struct dquot *);
92 static void dq_dqb32(const struct dquot *, struct dqblk32 *);
93 static void dq_dqb64(const struct dquot *, struct dqblk64 *);
94 static void dqb32_dqb64(const struct dqblk32 *, struct dqblk64 *);
95 static void dqb64_dqb32(const struct dqblk64 *, struct dqblk32 *);
98 static void dqref(struct dquot *);
99 static void chkdquot(struct inode *);
103 * Set up the quotas for an inode.
105 * This routine completely defines the semantics of quotas.
106 * If other criterion want to be used to establish quotas, the
107 * MAXQUOTAS value in quota.h should be increased, and the
108 * additional dquots set up here.
111 getinoquota(struct inode *ip)
113 struct ufsmount *ump;
120 * Disk quotas must be turned off for system files. Currently
121 * snapshot and quota files.
123 if ((vp->v_vflag & VV_SYSTEM) != 0)
126 * XXX: Turn off quotas for files with a negative UID or GID.
127 * This prevents the creation of 100GB+ quota files.
129 if ((int)ip->i_uid < 0 || (int)ip->i_gid < 0)
131 ump = VFSTOUFS(vp->v_mount);
133 * Set up the user quota based on file uid.
134 * EINVAL means that quotas are not enabled.
137 dqget(vp, ip->i_uid, ump, USRQUOTA, &ip->i_dquot[USRQUOTA])) &&
141 * Set up the group quota based on file gid.
142 * EINVAL means that quotas are not enabled.
145 dqget(vp, ip->i_gid, ump, GRPQUOTA, &ip->i_dquot[GRPQUOTA])) &&
152 * Update disk usage, and take corrective action.
155 chkdq(struct inode *ip, ufs2_daddr_t change, struct ucred *cred, int flags)
158 ufs2_daddr_t ncurblocks;
159 struct vnode *vp = ITOV(ip);
160 int i, error, warn, do_check;
162 MPASS(cred != NOCRED || (flags & FORCE) != 0);
164 * Disk quotas must be turned off for system files. Currently
165 * snapshot and quota files.
167 if ((vp->v_vflag & VV_SYSTEM) != 0)
170 * XXX: Turn off quotas for files with a negative UID or GID.
171 * This prevents the creation of 100GB+ quota files.
173 if ((int)ip->i_uid < 0 || (int)ip->i_gid < 0)
176 if ((flags & CHOWN) == 0)
182 for (i = 0; i < MAXQUOTAS; i++) {
183 if ((dq = ip->i_dquot[i]) == NODQUOT)
186 DQI_WAIT(dq, PINOD+1, "chkdq1");
187 ncurblocks = dq->dq_curblocks + change;
189 dq->dq_curblocks = ncurblocks;
191 dq->dq_curblocks = 0;
192 dq->dq_flags &= ~DQ_BLKS;
193 dq->dq_flags |= DQ_MOD;
198 if ((flags & FORCE) == 0 &&
199 priv_check_cred(cred, PRIV_VFS_EXCEEDQUOTA))
203 for (i = 0; i < MAXQUOTAS; i++) {
204 if ((dq = ip->i_dquot[i]) == NODQUOT)
208 DQI_WAIT(dq, PINOD+1, "chkdq2");
210 error = chkdqchg(ip, change, cred, i, &warn);
213 * Roll back user quota changes when
214 * group quota failed.
222 DQI_WAIT(dq, PINOD+1, "chkdq3");
223 ncurblocks = dq->dq_curblocks - change;
225 dq->dq_curblocks = ncurblocks;
227 dq->dq_curblocks = 0;
228 dq->dq_flags &= ~DQ_BLKS;
229 dq->dq_flags |= DQ_MOD;
235 /* Reset timer when crossing soft limit */
236 if (dq->dq_curblocks + change >= dq->dq_bsoftlimit &&
237 dq->dq_curblocks < dq->dq_bsoftlimit)
238 dq->dq_btime = time_second + ITOUMP(ip)->um_btime[i];
239 dq->dq_curblocks += change;
240 dq->dq_flags |= DQ_MOD;
243 uprintf("\n%s: warning, %s disk quota exceeded\n",
244 ITOVFS(ip)->mnt_stat.f_mntonname,
251 * Check for a valid change to a users allocation.
252 * Issue an error message if appropriate.
255 chkdqchg(struct inode *ip, ufs2_daddr_t change, struct ucred *cred,
258 struct dquot *dq = ip->i_dquot[type];
259 ufs2_daddr_t ncurblocks = dq->dq_curblocks + change;
262 * If user would exceed their hard limit, disallow space allocation.
264 if (ncurblocks >= dq->dq_bhardlimit && dq->dq_bhardlimit) {
265 if ((dq->dq_flags & DQ_BLKS) == 0 &&
266 ip->i_uid == cred->cr_uid) {
267 dq->dq_flags |= DQ_BLKS;
269 uprintf("\n%s: write failed, %s disk limit reached\n",
270 ITOVFS(ip)->mnt_stat.f_mntonname,
278 * If user is over their soft limit for too long, disallow space
279 * allocation. Reset time limit as they cross their soft limit.
281 if (ncurblocks >= dq->dq_bsoftlimit && dq->dq_bsoftlimit) {
282 if (dq->dq_curblocks < dq->dq_bsoftlimit) {
283 dq->dq_btime = time_second + ITOUMP(ip)->um_btime[type];
284 if (ip->i_uid == cred->cr_uid)
288 if (time_second > dq->dq_btime) {
289 if ((dq->dq_flags & DQ_BLKS) == 0 &&
290 ip->i_uid == cred->cr_uid) {
291 dq->dq_flags |= DQ_BLKS;
293 uprintf("\n%s: write failed, %s "
294 "disk quota exceeded for too long\n",
295 ITOVFS(ip)->mnt_stat.f_mntonname,
307 * Check the inode limit, applying corrective action.
310 chkiq(struct inode *ip, int change, struct ucred *cred, int flags)
313 int i, error, warn, do_check;
315 MPASS(cred != NOCRED || (flags & FORCE) != 0);
317 if ((flags & CHOWN) == 0)
323 for (i = 0; i < MAXQUOTAS; i++) {
324 if ((dq = ip->i_dquot[i]) == NODQUOT)
327 DQI_WAIT(dq, PINOD+1, "chkiq1");
328 if (dq->dq_curinodes >= -change)
329 dq->dq_curinodes += change;
331 dq->dq_curinodes = 0;
332 dq->dq_flags &= ~DQ_INODS;
333 dq->dq_flags |= DQ_MOD;
338 if ((flags & FORCE) == 0 &&
339 priv_check_cred(cred, PRIV_VFS_EXCEEDQUOTA))
343 for (i = 0; i < MAXQUOTAS; i++) {
344 if ((dq = ip->i_dquot[i]) == NODQUOT)
348 DQI_WAIT(dq, PINOD+1, "chkiq2");
350 error = chkiqchg(ip, change, cred, i, &warn);
353 * Roll back user quota changes when
354 * group quota failed.
362 DQI_WAIT(dq, PINOD+1, "chkiq3");
363 if (dq->dq_curinodes >= change)
364 dq->dq_curinodes -= change;
366 dq->dq_curinodes = 0;
367 dq->dq_flags &= ~DQ_INODS;
368 dq->dq_flags |= DQ_MOD;
374 /* Reset timer when crossing soft limit */
375 if (dq->dq_curinodes + change >= dq->dq_isoftlimit &&
376 dq->dq_curinodes < dq->dq_isoftlimit)
377 dq->dq_itime = time_second + ITOUMP(ip)->um_itime[i];
378 dq->dq_curinodes += change;
379 dq->dq_flags |= DQ_MOD;
382 uprintf("\n%s: warning, %s inode quota exceeded\n",
383 ITOVFS(ip)->mnt_stat.f_mntonname,
390 * Check for a valid change to a users allocation.
391 * Issue an error message if appropriate.
394 chkiqchg(struct inode *ip, int change, struct ucred *cred, int type, int *warn)
396 struct dquot *dq = ip->i_dquot[type];
397 ino_t ncurinodes = dq->dq_curinodes + change;
400 * If user would exceed their hard limit, disallow inode allocation.
402 if (ncurinodes >= dq->dq_ihardlimit && dq->dq_ihardlimit) {
403 if ((dq->dq_flags & DQ_INODS) == 0 &&
404 ip->i_uid == cred->cr_uid) {
405 dq->dq_flags |= DQ_INODS;
407 uprintf("\n%s: write failed, %s inode limit reached\n",
408 ITOVFS(ip)->mnt_stat.f_mntonname,
416 * If user is over their soft limit for too long, disallow inode
417 * allocation. Reset time limit as they cross their soft limit.
419 if (ncurinodes >= dq->dq_isoftlimit && dq->dq_isoftlimit) {
420 if (dq->dq_curinodes < dq->dq_isoftlimit) {
421 dq->dq_itime = time_second + ITOUMP(ip)->um_itime[type];
422 if (ip->i_uid == cred->cr_uid)
426 if (time_second > dq->dq_itime) {
427 if ((dq->dq_flags & DQ_INODS) == 0 &&
428 ip->i_uid == cred->cr_uid) {
429 dq->dq_flags |= DQ_INODS;
431 uprintf("\n%s: write failed, %s "
432 "inode quota exceeded for too long\n",
433 ITOVFS(ip)->mnt_stat.f_mntonname,
446 * On filesystems with quotas enabled, it is an error for a file to change
447 * size and not to have a dquot structure associated with it.
450 chkdquot(struct inode *ip)
452 struct ufsmount *ump;
460 * Disk quotas must be turned off for system files. Currently
461 * these are snapshots and quota files.
463 if ((vp->v_vflag & VV_SYSTEM) != 0)
466 * XXX: Turn off quotas for files with a negative UID or GID.
467 * This prevents the creation of 100GB+ quota files.
469 if ((int)ip->i_uid < 0 || (int)ip->i_gid < 0)
473 for (i = 0; i < MAXQUOTAS; i++) {
474 if (ump->um_quotas[i] == NULLVP ||
475 (ump->um_qflags[i] & (QTF_OPENING|QTF_CLOSING)))
477 if (ip->i_dquot[i] == NODQUOT) {
479 vn_printf(ITOV(ip), "chkdquot: missing dquot ");
480 panic("chkdquot: missing dquot");
488 * Code to process quotactl commands.
492 * Q_QUOTAON - set up a quota file for a particular filesystem.
495 quotaon(struct thread *td, struct mount *mp, int type, void *fname,
498 struct ufsmount *ump;
499 struct vnode *vp, **vpp;
505 error = priv_check(td, PRIV_UFS_QUOTAON);
509 if ((mp->mnt_flag & MNT_RDONLY) != 0)
515 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, fname);
516 flags = FREAD | FWRITE;
518 KASSERT(*mp_busy, ("%s called without busied mount", __func__));
521 error = vn_open(&nd, &flags, 0, NULL);
528 error = vfs_busy(mp, MBF_NOWAIT);
532 if (vp->v_type != VREG)
537 (void) vn_close(vp, FREAD|FWRITE, td->td_ucred, td);
542 if ((ump->um_qflags[type] & (QTF_OPENING|QTF_CLOSING)) != 0) {
545 (void) vn_close(vp, FREAD|FWRITE, td->td_ucred, td);
548 ump->um_qflags[type] |= QTF_OPENING|QTF_CLOSING;
550 if ((error = dqopen(vp, ump, type)) != 0) {
553 ump->um_qflags[type] &= ~(QTF_OPENING|QTF_CLOSING);
555 (void) vn_close(vp, FREAD|FWRITE, td->td_ucred, td);
560 mp->mnt_flag |= MNT_QUOTA;
561 mp->mnt_stat.f_flags |= MNT_QUOTA;
564 vpp = &ump->um_quotas[type];
566 quotaoff1(td, mp, type);
569 * When the directory vnode containing the quota file is
570 * inactivated, due to the shared lookup of the quota file
571 * vput()ing the dvp, the qsyncvp() call for the containing
572 * directory would try to acquire the quota lock exclusive.
573 * At the same time, lookup already locked the quota vnode
574 * shared. Mark the quota vnode lock as allowing recursion
575 * and automatically converting shared locks to exclusive.
577 * Also mark quota vnode as system.
579 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
580 vp->v_vflag |= VV_SYSTEM;
586 * Save the credential of the process that turned on quotas.
587 * Set up the time limits for this quota.
589 ump->um_cred[type] = crhold(td->td_ucred);
590 ump->um_btime[type] = MAX_DQ_TIME;
591 ump->um_itime[type] = MAX_IQ_TIME;
592 if (dqget(NULLVP, 0, ump, type, &dq) == 0) {
593 if (dq->dq_btime > 0)
594 ump->um_btime[type] = dq->dq_btime;
595 if (dq->dq_itime > 0)
596 ump->um_itime[type] = dq->dq_itime;
600 * Allow the getdq from getinoquota below to read the quota
604 ump->um_qflags[type] &= ~QTF_CLOSING;
607 * Search vnodes associated with this mount point,
608 * adding references to quota file being opened.
609 * NB: only need to add dquot's for inodes being modified.
612 MNT_VNODE_FOREACH_ALL(vp, mp, mvp) {
613 if (vget(vp, LK_EXCLUSIVE | LK_INTERLOCK)) {
614 MNT_VNODE_FOREACH_ALL_ABORT(mp, mvp);
617 if (vp->v_type == VNON || vp->v_writecount <= 0) {
622 error = getinoquota(VTOI(vp));
626 MNT_VNODE_FOREACH_ALL_ABORT(mp, mvp);
632 quotaoff_inchange(td, mp, type);
634 ump->um_qflags[type] &= ~QTF_OPENING;
635 KASSERT((ump->um_qflags[type] & QTF_CLOSING) == 0,
636 ("quotaon: leaking flags"));
643 * Main code to turn off disk quotas for a filesystem. Does not change
647 quotaoff1(struct thread *td, struct mount *mp, int type)
650 struct vnode *qvp, *mvp;
651 struct ufsmount *ump;
660 KASSERT((ump->um_qflags[type] & QTF_CLOSING) != 0,
661 ("quotaoff1: flags are invalid"));
662 if ((qvp = ump->um_quotas[type]) == NULLVP) {
666 cr = ump->um_cred[type];
670 * Search vnodes associated with this mount point,
671 * deleting any references to quota file being closed.
674 MNT_VNODE_FOREACH_ALL(vp, mp, mvp) {
675 if (vp->v_type == VNON) {
679 if (vget(vp, LK_EXCLUSIVE | LK_INTERLOCK)) {
680 MNT_VNODE_FOREACH_ALL_ABORT(mp, mvp);
684 dq = ip->i_dquot[type];
685 ip->i_dquot[type] = NODQUOT;
691 error = dqflush(qvp);
696 * Clear um_quotas before closing the quota vnode to prevent
697 * access to the closed vnode from dqget/dqsync
700 ump->um_quotas[type] = NULLVP;
701 ump->um_cred[type] = NOCRED;
704 vn_lock(qvp, LK_EXCLUSIVE | LK_RETRY);
705 qvp->v_vflag &= ~VV_SYSTEM;
707 error = vn_close(qvp, FREAD|FWRITE, td->td_ucred, td);
714 quotaoff_inchange1(struct thread *td, struct mount *mp, int type)
720 * mp is already suspended on unmount. If not, suspend it, to
721 * avoid the situation where quotaoff operation eventually
722 * failing due to SU structures still keeping references on
723 * dquots, but vnode's references are already clean. This
724 * would cause quota accounting leak and asserts otherwise.
725 * Note that the thread has already called vn_start_write().
727 if (mp->mnt_susp_owner == td) {
730 error = vfs_write_suspend_umnt(mp);
735 error = quotaoff1(td, mp, type);
737 vfs_write_resume(mp, VR_START_WRITE);
742 * Turns off quotas, assumes that ump->um_qflags are already checked
743 * and QTF_CLOSING is set to indicate operation in progress. Fixes
744 * ump->um_qflags and mp->mnt_flag after.
747 quotaoff_inchange(struct thread *td, struct mount *mp, int type)
749 struct ufsmount *ump;
752 error = quotaoff_inchange1(td, mp, type);
756 ump->um_qflags[type] &= ~QTF_CLOSING;
757 for (i = 0; i < MAXQUOTAS; i++)
758 if (ump->um_quotas[i] != NULLVP)
760 if (i == MAXQUOTAS) {
762 mp->mnt_flag &= ~MNT_QUOTA;
763 mp->mnt_stat.f_flags &= ~MNT_QUOTA;
771 * Q_QUOTAOFF - turn off disk quotas for a filesystem.
774 quotaoff(struct thread *td, struct mount *mp, int type)
776 struct ufsmount *ump;
779 error = priv_check(td, PRIV_UFS_QUOTAOFF);
785 if ((ump->um_qflags[type] & (QTF_OPENING|QTF_CLOSING)) != 0) {
789 ump->um_qflags[type] |= QTF_CLOSING;
792 return (quotaoff_inchange(td, mp, type));
796 * Q_GETQUOTA - return current values in a dqblk structure.
799 _getquota(struct thread *td, struct mount *mp, u_long id, int type,
807 if ((td->td_ucred->cr_uid != id) && !unprivileged_get_quota) {
808 error = priv_check(td, PRIV_VFS_GETQUOTA);
815 if (!groupmember(id, td->td_ucred) &&
816 !unprivileged_get_quota) {
817 error = priv_check(td, PRIV_VFS_GETQUOTA);
828 error = dqget(NULLVP, id, VFSTOUFS(mp), type, &dq);
837 * Q_SETQUOTA - assign an entire dqblk structure.
840 _setquota(struct thread *td, struct mount *mp, u_long id, int type,
845 struct ufsmount *ump;
846 struct dqblk64 newlim;
849 error = priv_check(td, PRIV_VFS_SETQUOTA);
858 error = dqget(NULLVP, id, ump, type, &ndq);
863 DQI_WAIT(dq, PINOD+1, "setqta");
865 * Copy all but the current values.
866 * Reset time limit if previously had no soft limit or were
867 * under it, but now have a soft limit and are over it.
869 newlim.dqb_curblocks = dq->dq_curblocks;
870 newlim.dqb_curinodes = dq->dq_curinodes;
871 if (dq->dq_id != 0) {
872 newlim.dqb_btime = dq->dq_btime;
873 newlim.dqb_itime = dq->dq_itime;
875 if (newlim.dqb_bsoftlimit &&
876 dq->dq_curblocks >= newlim.dqb_bsoftlimit &&
877 (dq->dq_bsoftlimit == 0 || dq->dq_curblocks < dq->dq_bsoftlimit))
878 newlim.dqb_btime = time_second + ump->um_btime[type];
879 if (newlim.dqb_isoftlimit &&
880 dq->dq_curinodes >= newlim.dqb_isoftlimit &&
881 (dq->dq_isoftlimit == 0 || dq->dq_curinodes < dq->dq_isoftlimit))
882 newlim.dqb_itime = time_second + ump->um_itime[type];
884 if (dq->dq_curblocks < dq->dq_bsoftlimit)
885 dq->dq_flags &= ~DQ_BLKS;
886 if (dq->dq_curinodes < dq->dq_isoftlimit)
887 dq->dq_flags &= ~DQ_INODS;
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;
892 dq->dq_flags &= ~DQ_FAKE;
893 dq->dq_flags |= DQ_MOD;
900 * Q_SETUSE - set current inode and block usage.
903 _setuse(struct thread *td, struct mount *mp, u_long id, int type,
907 struct ufsmount *ump;
909 struct dqblk64 usage;
912 error = priv_check(td, PRIV_UFS_SETUSE);
921 error = dqget(NULLVP, id, ump, type, &ndq);
926 DQI_WAIT(dq, PINOD+1, "setuse");
928 * Reset time limit if have a soft limit and were
929 * previously under it, but are now over it.
931 if (dq->dq_bsoftlimit && dq->dq_curblocks < dq->dq_bsoftlimit &&
932 usage.dqb_curblocks >= dq->dq_bsoftlimit)
933 dq->dq_btime = time_second + ump->um_btime[type];
934 if (dq->dq_isoftlimit && dq->dq_curinodes < dq->dq_isoftlimit &&
935 usage.dqb_curinodes >= dq->dq_isoftlimit)
936 dq->dq_itime = time_second + ump->um_itime[type];
937 dq->dq_curblocks = usage.dqb_curblocks;
938 dq->dq_curinodes = usage.dqb_curinodes;
939 if (dq->dq_curblocks < dq->dq_bsoftlimit)
940 dq->dq_flags &= ~DQ_BLKS;
941 if (dq->dq_curinodes < dq->dq_isoftlimit)
942 dq->dq_flags &= ~DQ_INODS;
943 dq->dq_flags |= DQ_MOD;
950 getquota32(struct thread *td, struct mount *mp, u_long id, int type, void *addr)
952 struct dqblk32 dqb32;
953 struct dqblk64 dqb64;
956 error = _getquota(td, mp, id, type, &dqb64);
959 dqb64_dqb32(&dqb64, &dqb32);
960 error = copyout(&dqb32, addr, sizeof(dqb32));
965 setquota32(struct thread *td, struct mount *mp, u_long id, int type, void *addr)
967 struct dqblk32 dqb32;
968 struct dqblk64 dqb64;
971 error = copyin(addr, &dqb32, sizeof(dqb32));
974 dqb32_dqb64(&dqb32, &dqb64);
975 error = _setquota(td, mp, id, type, &dqb64);
980 setuse32(struct thread *td, struct mount *mp, u_long id, int type, void *addr)
982 struct dqblk32 dqb32;
983 struct dqblk64 dqb64;
986 error = copyin(addr, &dqb32, sizeof(dqb32));
989 dqb32_dqb64(&dqb32, &dqb64);
990 error = _setuse(td, mp, id, type, &dqb64);
995 getquota(struct thread *td, struct mount *mp, u_long id, int type, void *addr)
997 struct dqblk64 dqb64;
1000 error = _getquota(td, mp, id, type, &dqb64);
1003 error = copyout(&dqb64, addr, sizeof(dqb64));
1008 setquota(struct thread *td, struct mount *mp, u_long id, int type, void *addr)
1010 struct dqblk64 dqb64;
1013 error = copyin(addr, &dqb64, sizeof(dqb64));
1016 error = _setquota(td, mp, id, type, &dqb64);
1021 setuse(struct thread *td, struct mount *mp, u_long id, int type, void *addr)
1023 struct dqblk64 dqb64;
1026 error = copyin(addr, &dqb64, sizeof(dqb64));
1029 error = _setuse(td, mp, id, type, &dqb64);
1034 * Q_GETQUOTASIZE - get bit-size of quota file fields
1037 getquotasize(struct thread *td, struct mount *mp, u_long id, int type,
1040 struct ufsmount *ump = VFSTOUFS(mp);
1044 if (ump->um_quotas[type] == NULLVP ||
1045 (ump->um_qflags[type] & QTF_CLOSING)) {
1049 if ((ump->um_qflags[type] & QTF_64BIT) != 0)
1054 return (copyout(&bitsize, sizep, sizeof(int)));
1058 * Q_SYNC - sync quota files to disk.
1061 qsync(struct mount *mp)
1063 struct ufsmount *ump = VFSTOUFS(mp);
1064 struct vnode *vp, *mvp;
1069 * Check if the mount point has any quotas.
1070 * If not, simply return.
1072 for (i = 0; i < MAXQUOTAS; i++)
1073 if (ump->um_quotas[i] != NULLVP)
1078 * Search vnodes associated with this mount point,
1079 * synchronizing any modified dquot structures.
1082 MNT_VNODE_FOREACH_ALL(vp, mp, mvp) {
1083 if (vp->v_type == VNON) {
1087 error = vget(vp, LK_EXCLUSIVE | LK_INTERLOCK);
1089 if (error == ENOENT) {
1090 MNT_VNODE_FOREACH_ALL_ABORT(mp, mvp);
1095 for (i = 0; i < MAXQUOTAS; i++) {
1096 dq = VTOI(vp)->i_dquot[i];
1106 * Sync quota file for given vnode to disk.
1109 qsyncvp(struct vnode *vp)
1111 struct ufsmount *ump = VFSTOUFS(vp->v_mount);
1116 * Check if the mount point has any quotas.
1117 * If not, simply return.
1119 for (i = 0; i < MAXQUOTAS; i++)
1120 if (ump->um_quotas[i] != NULLVP)
1125 * Search quotas associated with this vnode
1126 * synchronizing any modified dquot structures.
1128 for (i = 0; i < MAXQUOTAS; i++) {
1129 dq = VTOI(vp)->i_dquot[i];
1137 * Code pertaining to management of the in-core dquot data structures.
1139 #define DQHASH(dqvp, id) \
1140 (&dqhashtbl[((((intptr_t)(dqvp)) >> 8) + id) & dqhash])
1141 static LIST_HEAD(dqhash, dquot) *dqhashtbl;
1142 static u_long dqhash;
1147 #define DQUOTINC 5 /* minimum free dquots desired */
1148 static TAILQ_HEAD(dqfreelist, dquot) dqfreelist;
1149 static long numdquot, desireddquot = DQUOTINC;
1152 * Lock to protect quota hash, dq free list and dq_cnt ref counters of
1157 #define DQH_LOCK() mtx_lock(&dqhlock)
1158 #define DQH_UNLOCK() mtx_unlock(&dqhlock)
1160 static struct dquot *dqhashfind(struct dqhash *dqh, u_long id,
1161 struct vnode *dqvp);
1164 * Initialize the quota system.
1170 mtx_init(&dqhlock, "dqhlock", NULL, MTX_DEF);
1171 dqhashtbl = hashinit(desiredvnodes, M_DQUOT, &dqhash);
1172 TAILQ_INIT(&dqfreelist);
1176 * Shut down the quota system.
1183 hashdestroy(dqhashtbl, M_DQUOT, dqhash);
1184 while ((dq = TAILQ_FIRST(&dqfreelist)) != NULL) {
1185 TAILQ_REMOVE(&dqfreelist, dq, dq_freelist);
1186 mtx_destroy(&dq->dq_lock);
1189 mtx_destroy(&dqhlock);
1192 static struct dquot *
1193 dqhashfind(struct dqhash *dqh, u_long id, struct vnode *dqvp)
1197 mtx_assert(&dqhlock, MA_OWNED);
1198 LIST_FOREACH(dq, dqh, dq_hash) {
1199 if (dq->dq_id != id ||
1200 dq->dq_ump->um_quotas[dq->dq_type] != dqvp)
1203 * Cache hit with no references. Take
1204 * the structure off the free list.
1206 if (dq->dq_cnt == 0)
1207 TAILQ_REMOVE(&dqfreelist, dq, dq_freelist);
1215 * Determine the quota file type.
1217 * A 32-bit quota file is simply an array of struct dqblk32.
1219 * A 64-bit quota file is a struct dqhdr64 followed by an array of struct
1220 * dqblk64. The header contains various magic bits which allow us to be
1221 * reasonably confident that it is indeeda 64-bit quota file and not just
1222 * a 32-bit quota file that just happens to "look right".
1226 dqopen(struct vnode *vp, struct ufsmount *ump, int type)
1233 ASSERT_VOP_LOCKED(vp, "dqopen");
1234 auio.uio_iov = &aiov;
1235 auio.uio_iovcnt = 1;
1236 aiov.iov_base = &dqh;
1237 aiov.iov_len = sizeof(dqh);
1238 auio.uio_resid = sizeof(dqh);
1239 auio.uio_offset = 0;
1240 auio.uio_segflg = UIO_SYSSPACE;
1241 auio.uio_rw = UIO_READ;
1242 auio.uio_td = (struct thread *)0;
1243 error = VOP_READ(vp, &auio, 0, ump->um_cred[type]);
1247 if (auio.uio_resid > 0) {
1248 /* assume 32 bits */
1253 if (strcmp(dqh.dqh_magic, Q_DQHDR64_MAGIC) == 0 &&
1254 be32toh(dqh.dqh_version) == Q_DQHDR64_VERSION &&
1255 be32toh(dqh.dqh_hdrlen) == (uint32_t)sizeof(struct dqhdr64) &&
1256 be32toh(dqh.dqh_reclen) == (uint32_t)sizeof(struct dqblk64)) {
1257 /* XXX: what if the magic matches, but the sizes are wrong? */
1258 ump->um_qflags[type] |= QTF_64BIT;
1260 ump->um_qflags[type] &= ~QTF_64BIT;
1268 * Obtain a dquot structure for the specified identifier and quota file
1269 * reading the information from the file if necessary.
1272 dqget(struct vnode *vp, u_long id, struct ufsmount *ump, int type,
1275 uint8_t buf[sizeof(struct dqblk64)];
1276 off_t base, recsize;
1277 struct dquot *dq, *dq1;
1282 int dqvplocked, error;
1284 #ifdef DEBUG_VFS_LOCKS
1286 ASSERT_VOP_ELOCKED(vp, "dqget");
1289 if (vp != NULLVP && *dqp != NODQUOT) {
1293 /* XXX: Disallow negative id values to prevent the
1294 * creation of 100GB+ quota data files.
1300 dqvp = ump->um_quotas[type];
1301 if (dqvp == NULLVP || (ump->um_qflags[type] & QTF_CLOSING)) {
1312 * Check the cache first.
1314 dqh = DQHASH(dqvp, id);
1316 dq = dqhashfind(dqh, id, dqvp);
1319 hfound: DQI_LOCK(dq);
1320 DQI_WAIT(dq, PINOD+1, "dqget");
1322 if (dq->dq_ump == NULL) {
1336 * Quota vnode lock is before DQ_LOCK. Acquire dqvp lock there
1337 * since new dq will appear on the hash chain DQ_LOCKed.
1341 vn_lock(dqvp, LK_SHARED | LK_RETRY);
1345 * Recheck the cache after sleep for quota vnode lock.
1347 dq = dqhashfind(dqh, id, dqvp);
1355 * Not in cache, allocate a new one or take it from the
1358 if (TAILQ_FIRST(&dqfreelist) == NODQUOT &&
1359 numdquot < MAXQUOTAS * desiredvnodes)
1360 desireddquot += DQUOTINC;
1361 if (numdquot < desireddquot) {
1364 dq1 = malloc(sizeof *dq1, M_DQUOT, M_WAITOK | M_ZERO);
1365 mtx_init(&dq1->dq_lock, "dqlock", NULL, MTX_DEF);
1368 * Recheck the cache after sleep for memory.
1370 dq = dqhashfind(dqh, id, dqvp);
1374 mtx_destroy(&dq1->dq_lock);
1380 if ((dq = TAILQ_FIRST(&dqfreelist)) == NULL) {
1390 if (dq->dq_cnt || (dq->dq_flags & DQ_MOD))
1391 panic("dqget: free dquot isn't %p", dq);
1392 TAILQ_REMOVE(&dqfreelist, dq, dq_freelist);
1393 if (dq->dq_ump != NULL)
1394 LIST_REMOVE(dq, dq_hash);
1398 * Dq is put into hash already locked to prevent parallel
1399 * usage while it is being read from file.
1401 dq->dq_flags = DQ_LOCK;
1405 LIST_INSERT_HEAD(dqh, dq, dq_hash);
1410 * Read the requested quota record from the quota file, performing
1411 * any necessary conversions.
1413 if (ump->um_qflags[type] & QTF_64BIT) {
1414 recsize = sizeof(struct dqblk64);
1415 base = sizeof(struct dqhdr64);
1417 recsize = sizeof(struct dqblk32);
1420 auio.uio_iov = &aiov;
1421 auio.uio_iovcnt = 1;
1422 aiov.iov_base = buf;
1423 aiov.iov_len = recsize;
1424 auio.uio_resid = recsize;
1425 auio.uio_offset = base + id * recsize;
1426 auio.uio_segflg = UIO_SYSSPACE;
1427 auio.uio_rw = UIO_READ;
1428 auio.uio_td = (struct thread *)0;
1430 error = VOP_READ(dqvp, &auio, 0, ump->um_cred[type]);
1431 if (auio.uio_resid == recsize && error == 0) {
1432 bzero(&dq->dq_dqb, sizeof(dq->dq_dqb));
1434 if (ump->um_qflags[type] & QTF_64BIT)
1435 dqb64_dq((struct dqblk64 *)buf, dq);
1437 dqb32_dq((struct dqblk32 *)buf, dq);
1444 * I/O error in reading quota file, release
1445 * quota structure and reflect problem to caller.
1450 LIST_REMOVE(dq, dq_hash);
1453 if (dq->dq_flags & DQ_WANT)
1463 * Check for no limit to enforce.
1464 * Initialize time values if necessary.
1466 if (dq->dq_isoftlimit == 0 && dq->dq_bsoftlimit == 0 &&
1467 dq->dq_ihardlimit == 0 && dq->dq_bhardlimit == 0)
1468 dq->dq_flags |= DQ_FAKE;
1469 if (dq->dq_id != 0) {
1470 if (dq->dq_btime == 0) {
1471 dq->dq_btime = time_second + ump->um_btime[type];
1472 if (dq->dq_bsoftlimit &&
1473 dq->dq_curblocks >= dq->dq_bsoftlimit)
1474 dq->dq_flags |= DQ_MOD;
1476 if (dq->dq_itime == 0) {
1477 dq->dq_itime = time_second + ump->um_itime[type];
1478 if (dq->dq_isoftlimit &&
1479 dq->dq_curinodes >= dq->dq_isoftlimit)
1480 dq->dq_flags |= DQ_MOD;
1491 * Obtain a reference to a dquot.
1494 dqref(struct dquot *dq)
1502 * Release a reference to a dquot.
1505 dqrele(struct vnode *vp, struct dquot *dq)
1511 KASSERT(dq->dq_cnt > 0, ("Lost dq %p reference 1", dq));
1512 if (dq->dq_cnt > 1) {
1519 (void) dqsync(vp, dq);
1522 KASSERT(dq->dq_cnt > 0, ("Lost dq %p reference 2", dq));
1523 if (--dq->dq_cnt > 0)
1530 * The dq may become dirty after it is synced but before it is
1531 * put to the free list. Checking the DQ_MOD there without
1532 * locking dq should be safe since no other references to the
1535 if ((dq->dq_flags & DQ_MOD) != 0) {
1540 TAILQ_INSERT_TAIL(&dqfreelist, dq, dq_freelist);
1545 * Update the disk quota in the quota file.
1548 dqsync(struct vnode *vp, struct dquot *dq)
1550 uint8_t buf[sizeof(struct dqblk64)];
1551 off_t base, recsize;
1557 struct ufsmount *ump;
1559 #ifdef DEBUG_VFS_LOCKS
1561 ASSERT_VOP_ELOCKED(vp, "dqsync");
1567 panic("dqsync: dquot");
1568 if ((ump = dq->dq_ump) == NULL)
1571 if ((dqvp = ump->um_quotas[dq->dq_type]) == NULLVP) {
1576 panic("dqsync: file");
1582 if ((dq->dq_flags & DQ_MOD) == 0) {
1589 (void) vn_start_secondary_write(dqvp, &mp, V_WAIT);
1591 vn_lock(dqvp, LK_EXCLUSIVE | LK_RETRY);
1594 DQI_WAIT(dq, PINOD+2, "dqsync");
1595 if ((dq->dq_flags & DQ_MOD) == 0)
1597 dq->dq_flags |= DQ_LOCK;
1601 * Write the quota record to the quota file, performing any
1602 * necessary conversions. See dqget() for additional details.
1604 if (ump->um_qflags[dq->dq_type] & QTF_64BIT) {
1605 dq_dqb64(dq, (struct dqblk64 *)buf);
1606 recsize = sizeof(struct dqblk64);
1607 base = sizeof(struct dqhdr64);
1609 dq_dqb32(dq, (struct dqblk32 *)buf);
1610 recsize = sizeof(struct dqblk32);
1614 auio.uio_iov = &aiov;
1615 auio.uio_iovcnt = 1;
1616 aiov.iov_base = buf;
1617 aiov.iov_len = recsize;
1618 auio.uio_resid = recsize;
1619 auio.uio_offset = base + dq->dq_id * recsize;
1620 auio.uio_segflg = UIO_SYSSPACE;
1621 auio.uio_rw = UIO_WRITE;
1622 auio.uio_td = (struct thread *)0;
1623 error = VOP_WRITE(dqvp, &auio, 0, dq->dq_ump->um_cred[dq->dq_type]);
1624 if (auio.uio_resid && error == 0)
1629 dq->dq_flags &= ~DQ_MOD;
1636 vn_finished_secondary_write(mp);
1641 * Flush all entries from the cache for a particular vnode.
1644 dqflush(struct vnode *vp)
1646 struct dquot *dq, *nextdq;
1651 * Move all dquot's that used to refer to this quota
1652 * file off their hash chains (they will eventually
1653 * fall off the head of the free list and be re-used).
1657 for (dqh = &dqhashtbl[dqhash]; dqh >= dqhashtbl; dqh--) {
1658 for (dq = LIST_FIRST(dqh); dq; dq = nextdq) {
1659 nextdq = LIST_NEXT(dq, dq_hash);
1660 if (dq->dq_ump->um_quotas[dq->dq_type] != vp)
1665 LIST_REMOVE(dq, dq_hash);
1675 * The following three functions are provided for the adjustment of
1676 * quotas by the soft updates code.
1680 * Acquire a reference to the quota structures associated with a vnode.
1681 * Return count of number of quota structures found.
1692 for (i = 0; i < MAXQUOTAS; i++)
1695 * Disk quotas must be turned off for system files. Currently
1696 * snapshot and quota files.
1698 if ((vp->v_vflag & VV_SYSTEM) != 0)
1701 * Iterate through and copy active quotas.
1706 for (i = 0; i < MAXQUOTAS; i++) {
1707 if ((dq = ip->i_dquot[i]) == NODQUOT)
1713 mtx_unlock(&dqhlock);
1718 * Release a set of quota structures obtained from a vnode.
1727 for (i = 0; i < MAXQUOTAS; i++) {
1728 if ((dq = qrp[i]) == NODQUOT)
1735 * Adjust the number of blocks associated with a quota.
1736 * Positive numbers when adding blocks; negative numbers when freeing blocks.
1739 quotaadj(qrp, ump, blkcount)
1741 struct ufsmount *ump;
1745 ufs2_daddr_t ncurblocks;
1750 for (i = 0; i < MAXQUOTAS; i++) {
1751 if ((dq = qrp[i]) == NODQUOT)
1754 DQI_WAIT(dq, PINOD+1, "adjqta");
1755 ncurblocks = dq->dq_curblocks + blkcount;
1756 if (ncurblocks >= 0)
1757 dq->dq_curblocks = ncurblocks;
1759 dq->dq_curblocks = 0;
1761 dq->dq_flags &= ~DQ_BLKS;
1762 else if (dq->dq_curblocks + blkcount >= dq->dq_bsoftlimit &&
1763 dq->dq_curblocks < dq->dq_bsoftlimit)
1764 dq->dq_btime = time_second + ump->um_btime[i];
1765 dq->dq_flags |= DQ_MOD;
1769 #endif /* SOFTUPDATES */
1772 * 32-bit / 64-bit conversion functions.
1774 * 32-bit quota records are stored in native byte order. Attention must
1775 * be paid to overflow issues.
1777 * 64-bit quota records are stored in network byte order.
1780 #define CLIP32(u64) (u64 > UINT32_MAX ? UINT32_MAX : (uint32_t)u64)
1783 * Convert 32-bit host-order structure to dquot.
1786 dqb32_dq(const struct dqblk32 *dqb32, struct dquot *dq)
1789 dq->dq_bhardlimit = dqb32->dqb_bhardlimit;
1790 dq->dq_bsoftlimit = dqb32->dqb_bsoftlimit;
1791 dq->dq_curblocks = dqb32->dqb_curblocks;
1792 dq->dq_ihardlimit = dqb32->dqb_ihardlimit;
1793 dq->dq_isoftlimit = dqb32->dqb_isoftlimit;
1794 dq->dq_curinodes = dqb32->dqb_curinodes;
1795 dq->dq_btime = dqb32->dqb_btime;
1796 dq->dq_itime = dqb32->dqb_itime;
1800 * Convert 64-bit network-order structure to dquot.
1803 dqb64_dq(const struct dqblk64 *dqb64, struct dquot *dq)
1806 dq->dq_bhardlimit = be64toh(dqb64->dqb_bhardlimit);
1807 dq->dq_bsoftlimit = be64toh(dqb64->dqb_bsoftlimit);
1808 dq->dq_curblocks = be64toh(dqb64->dqb_curblocks);
1809 dq->dq_ihardlimit = be64toh(dqb64->dqb_ihardlimit);
1810 dq->dq_isoftlimit = be64toh(dqb64->dqb_isoftlimit);
1811 dq->dq_curinodes = be64toh(dqb64->dqb_curinodes);
1812 dq->dq_btime = be64toh(dqb64->dqb_btime);
1813 dq->dq_itime = be64toh(dqb64->dqb_itime);
1817 * Convert dquot to 32-bit host-order structure.
1820 dq_dqb32(const struct dquot *dq, struct dqblk32 *dqb32)
1823 dqb32->dqb_bhardlimit = CLIP32(dq->dq_bhardlimit);
1824 dqb32->dqb_bsoftlimit = CLIP32(dq->dq_bsoftlimit);
1825 dqb32->dqb_curblocks = CLIP32(dq->dq_curblocks);
1826 dqb32->dqb_ihardlimit = CLIP32(dq->dq_ihardlimit);
1827 dqb32->dqb_isoftlimit = CLIP32(dq->dq_isoftlimit);
1828 dqb32->dqb_curinodes = CLIP32(dq->dq_curinodes);
1829 dqb32->dqb_btime = CLIP32(dq->dq_btime);
1830 dqb32->dqb_itime = CLIP32(dq->dq_itime);
1834 * Convert dquot to 64-bit network-order structure.
1837 dq_dqb64(const struct dquot *dq, struct dqblk64 *dqb64)
1840 dqb64->dqb_bhardlimit = htobe64(dq->dq_bhardlimit);
1841 dqb64->dqb_bsoftlimit = htobe64(dq->dq_bsoftlimit);
1842 dqb64->dqb_curblocks = htobe64(dq->dq_curblocks);
1843 dqb64->dqb_ihardlimit = htobe64(dq->dq_ihardlimit);
1844 dqb64->dqb_isoftlimit = htobe64(dq->dq_isoftlimit);
1845 dqb64->dqb_curinodes = htobe64(dq->dq_curinodes);
1846 dqb64->dqb_btime = htobe64(dq->dq_btime);
1847 dqb64->dqb_itime = htobe64(dq->dq_itime);
1851 * Convert 64-bit host-order structure to 32-bit host-order structure.
1854 dqb64_dqb32(const struct dqblk64 *dqb64, struct dqblk32 *dqb32)
1857 dqb32->dqb_bhardlimit = CLIP32(dqb64->dqb_bhardlimit);
1858 dqb32->dqb_bsoftlimit = CLIP32(dqb64->dqb_bsoftlimit);
1859 dqb32->dqb_curblocks = CLIP32(dqb64->dqb_curblocks);
1860 dqb32->dqb_ihardlimit = CLIP32(dqb64->dqb_ihardlimit);
1861 dqb32->dqb_isoftlimit = CLIP32(dqb64->dqb_isoftlimit);
1862 dqb32->dqb_curinodes = CLIP32(dqb64->dqb_curinodes);
1863 dqb32->dqb_btime = CLIP32(dqb64->dqb_btime);
1864 dqb32->dqb_itime = CLIP32(dqb64->dqb_itime);
1868 * Convert 32-bit host-order structure to 64-bit host-order structure.
1871 dqb32_dqb64(const struct dqblk32 *dqb32, struct dqblk64 *dqb64)
1874 dqb64->dqb_bhardlimit = dqb32->dqb_bhardlimit;
1875 dqb64->dqb_bsoftlimit = dqb32->dqb_bsoftlimit;
1876 dqb64->dqb_curblocks = dqb32->dqb_curblocks;
1877 dqb64->dqb_ihardlimit = dqb32->dqb_ihardlimit;
1878 dqb64->dqb_isoftlimit = dqb32->dqb_isoftlimit;
1879 dqb64->dqb_curinodes = dqb32->dqb_curinodes;
1880 dqb64->dqb_btime = dqb32->dqb_btime;
1881 dqb64->dqb_itime = dqb32->dqb_itime;