Annotation of sys/ufs/ufs/ufs_quota.c, Revision 1.1.1.1
1.1 nbrk 1: /* $OpenBSD: ufs_quota.c,v 1.28 2007/08/03 18:41:44 millert Exp $ */
2: /* $NetBSD: ufs_quota.c,v 1.8 1996/02/09 22:36:09 christos Exp $ */
3:
4: /*
5: * Copyright (c) 1982, 1986, 1990, 1993, 1995
6: * The Regents of the University of California. All rights reserved.
7: *
8: * This code is derived from software contributed to Berkeley by
9: * Robert Elz at The University of Melbourne.
10: *
11: * Redistribution and use in source and binary forms, with or without
12: * modification, are permitted provided that the following conditions
13: * are met:
14: * 1. Redistributions of source code must retain the above copyright
15: * notice, this list of conditions and the following disclaimer.
16: * 2. Redistributions in binary form must reproduce the above copyright
17: * notice, this list of conditions and the following disclaimer in the
18: * documentation and/or other materials provided with the distribution.
19: * 3. Neither the name of the University nor the names of its contributors
20: * may be used to endorse or promote products derived from this software
21: * without specific prior written permission.
22: *
23: * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
24: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
25: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
26: * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
27: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
28: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
29: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
30: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
31: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
32: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
33: * SUCH DAMAGE.
34: *
35: * @(#)ufs_quota.c 8.5 (Berkeley) 8/19/94
36: */
37:
38: #include <sys/param.h>
39: #include <sys/kernel.h>
40: #include <sys/systm.h>
41: #include <sys/namei.h>
42: #include <sys/malloc.h>
43: #include <sys/file.h>
44: #include <sys/proc.h>
45: #include <sys/vnode.h>
46: #include <sys/mount.h>
47:
48: #include <ufs/ufs/quota.h>
49: #include <ufs/ufs/inode.h>
50: #include <ufs/ufs/ufsmount.h>
51: #include <ufs/ufs/ufs_extern.h>
52:
53: #include <sys/queue.h>
54:
55: /*
56: * The following structure records disk usage for a user or group on a
57: * filesystem. There is one allocated for each quota that exists on any
58: * filesystem for the current user or group. A cache is kept of recently
59: * used entries.
60: */
61: struct dquot {
62: LIST_ENTRY(dquot) dq_hash; /* hash list */
63: TAILQ_ENTRY(dquot) dq_freelist; /* free list */
64: u_int16_t dq_flags; /* flags, see below */
65: u_int16_t dq_type; /* quota type of this dquot */
66: u_int32_t dq_cnt; /* count of active references */
67: u_int32_t dq_id; /* identifier this applies to */
68: struct vnode *dq_vp; /* file backing this quota */
69: struct ucred *dq_cred; /* credentials for writing file */
70: struct dqblk dq_dqb; /* actual usage & quotas */
71: };
72:
73: /*
74: * Flag values.
75: */
76: #define DQ_LOCK 0x01 /* this quota locked (no MODS) */
77: #define DQ_WANT 0x02 /* wakeup on unlock */
78: #define DQ_MOD 0x04 /* this quota modified since read */
79: #define DQ_FAKE 0x08 /* no limits here, just usage */
80: #define DQ_BLKS 0x10 /* has been warned about blk limit */
81: #define DQ_INODS 0x20 /* has been warned about inode limit */
82:
83: /*
84: * Shorthand notation.
85: */
86: #define dq_bhardlimit dq_dqb.dqb_bhardlimit
87: #define dq_bsoftlimit dq_dqb.dqb_bsoftlimit
88: #define dq_curblocks dq_dqb.dqb_curblocks
89: #define dq_ihardlimit dq_dqb.dqb_ihardlimit
90: #define dq_isoftlimit dq_dqb.dqb_isoftlimit
91: #define dq_curinodes dq_dqb.dqb_curinodes
92: #define dq_btime dq_dqb.dqb_btime
93: #define dq_itime dq_dqb.dqb_itime
94:
95: /*
96: * If the system has never checked for a quota for this file, then it is
97: * set to NODQUOT. Once a write attempt is made the inode pointer is set
98: * to reference a dquot structure.
99: */
100: #define NODQUOT NULL
101:
102: void dqref(struct dquot *);
103: void dqrele(struct vnode *, struct dquot *);
104: int dqsync(struct vnode *, struct dquot *);
105:
106: #ifdef DIAGNOSTIC
107: void chkdquot(struct inode *);
108: #endif
109:
110: int getquota(struct mount *, u_long, int, caddr_t);
111: int quotaon(struct proc *, struct mount *, int, caddr_t);
112: int setquota(struct mount *, u_long, int, caddr_t);
113: int setuse(struct mount *, u_long, int, caddr_t);
114:
115: int chkdqchg(struct inode *, long, struct ucred *, int);
116: int chkiqchg(struct inode *, long, struct ucred *, int);
117:
118: int dqget(struct vnode *, u_long, struct ufsmount *, int,
119: struct dquot **);
120:
121: int quotaon_vnode(struct vnode *, void *);
122: int quotaoff_vnode(struct vnode *, void *);
123: int qsync_vnode(struct vnode *, void *);
124:
125: /*
126: * Quota name to error message mapping.
127: */
128: static char *quotatypes[] = INITQFNAMES;
129:
130: /*
131: * Obtain a reference to a dquot.
132: */
133: void
134: dqref(struct dquot *dq)
135: {
136: dq->dq_cnt++;
137: }
138:
139: /*
140: * Set up the quotas for an inode.
141: *
142: * This routine completely defines the semantics of quotas.
143: * If other criterion want to be used to establish quotas, the
144: * MAXQUOTAS value in quotas.h should be increased, and the
145: * additional dquots set up here.
146: */
147: int
148: getinoquota(struct inode *ip)
149: {
150: struct ufsmount *ump;
151: struct vnode *vp = ITOV(ip);
152: int error;
153:
154: ump = ip->i_ump;
155: /*
156: * Set up the user quota based on file uid.
157: * EINVAL means that quotas are not enabled.
158: */
159: if (ip->i_dquot[USRQUOTA] == NODQUOT &&
160: (error =
161: dqget(vp, DIP(ip, uid), ump, USRQUOTA, &ip->i_dquot[USRQUOTA])) &&
162: error != EINVAL)
163: return (error);
164: /*
165: * Set up the group quota based on file gid.
166: * EINVAL means that quotas are not enabled.
167: */
168: if (ip->i_dquot[GRPQUOTA] == NODQUOT &&
169: (error =
170: dqget(vp, DIP(ip, gid), ump, GRPQUOTA, &ip->i_dquot[GRPQUOTA])) &&
171: error != EINVAL)
172: return (error);
173: return (0);
174: }
175:
176: /*
177: * Update disk usage, and take corrective action.
178: */
179: int
180: ufs_quota_alloc_blocks2(struct inode *ip, int32_t change,
181: struct ucred *cred, enum ufs_quota_flags flags)
182: {
183: struct dquot *dq;
184: int i;
185: int error;
186:
187: #ifdef DIAGNOSTIC
188: chkdquot(ip);
189: #endif
190:
191: if (change == 0)
192: return (0);
193:
194: if ((flags & UFS_QUOTA_FORCE) == 0 &&
195: (cred != NOCRED && cred->cr_uid != 0)) {
196: for (i = 0; i < MAXQUOTAS; i++) {
197: if (flags & (1 << i))
198: continue;
199: if ((dq = ip->i_dquot[i]) == NODQUOT)
200: continue;
201: if ((error = chkdqchg(ip, change, cred, i)) != 0)
202: return (error);
203: }
204: }
205: for (i = 0; i < MAXQUOTAS; i++) {
206: if (flags & (1 << i))
207: continue;
208: if ((dq = ip->i_dquot[i]) == NODQUOT)
209: continue;
210: while (dq->dq_flags & DQ_LOCK) {
211: dq->dq_flags |= DQ_WANT;
212: (void) tsleep(dq, PINOD+1, "chkdq", 0);
213: }
214: dq->dq_curblocks += change;
215: dq->dq_flags |= DQ_MOD;
216: }
217: return (0);
218: }
219:
220: int
221: ufs_quota_free_blocks2(struct inode *ip, int32_t change,
222: struct ucred *cred, enum ufs_quota_flags flags)
223: {
224: struct dquot *dq;
225: int i;
226:
227: #ifdef DIAGNOSTIC
228: if (!VOP_ISLOCKED(ITOV(ip)))
229: panic ("ufs_quota_free_blocks2: vnode is not locked");
230: #endif
231:
232: if (change == 0)
233: return (0);
234:
235: for (i = 0; i < MAXQUOTAS; i++) {
236: if (flags & (1 << i))
237: continue;
238: if ((dq = ip->i_dquot[i]) == NODQUOT)
239: continue;
240: while (dq->dq_flags & DQ_LOCK) {
241: dq->dq_flags |= DQ_WANT;
242: (void) tsleep(dq, PINOD+1, "chkdq", 0);
243: }
244: if (dq->dq_curblocks >= change)
245: dq->dq_curblocks -= change;
246: else
247: dq->dq_curblocks = 0;
248: dq->dq_flags &= ~DQ_BLKS;
249: dq->dq_flags |= DQ_MOD;
250: }
251: return (0);
252: }
253:
254: /*
255: * Check for a valid change to a users allocation.
256: * Issue an error message if appropriate.
257: */
258: int
259: chkdqchg(struct inode *ip, long change, struct ucred *cred, int type)
260: {
261: struct dquot *dq = ip->i_dquot[type];
262: long ncurblocks = dq->dq_curblocks + change;
263:
264: /*
265: * If user would exceed their hard limit, disallow space allocation.
266: */
267: if (ncurblocks >= dq->dq_bhardlimit && dq->dq_bhardlimit) {
268: if ((dq->dq_flags & DQ_BLKS) == 0 &&
269: DIP(ip, uid) == cred->cr_uid) {
270: uprintf("\n%s: write failed, %s disk limit reached\n",
271: ITOV(ip)->v_mount->mnt_stat.f_mntonname,
272: quotatypes[type]);
273: dq->dq_flags |= DQ_BLKS;
274: }
275: return (EDQUOT);
276: }
277: /*
278: * If user is over their soft limit for too long, disallow space
279: * allocation. Reset time limit as they cross their soft limit.
280: */
281: if (ncurblocks >= dq->dq_bsoftlimit && dq->dq_bsoftlimit) {
282: if (dq->dq_curblocks < dq->dq_bsoftlimit) {
283: dq->dq_btime = time_second +
284: ip->i_ump->um_btime[type];
285: if (DIP(ip, uid) == cred->cr_uid)
286: uprintf("\n%s: warning, %s %s\n",
287: ITOV(ip)->v_mount->mnt_stat.f_mntonname,
288: quotatypes[type], "disk quota exceeded");
289: return (0);
290: }
291: if (time_second > dq->dq_btime) {
292: if ((dq->dq_flags & DQ_BLKS) == 0 &&
293: DIP(ip, uid) == cred->cr_uid) {
294: uprintf("\n%s: write failed, %s %s\n",
295: ITOV(ip)->v_mount->mnt_stat.f_mntonname,
296: quotatypes[type],
297: "disk quota exceeded for too long");
298: dq->dq_flags |= DQ_BLKS;
299: }
300: return (EDQUOT);
301: }
302: }
303: return (0);
304: }
305:
306: /*
307: * Check the inode limit, applying corrective action.
308: */
309: int
310: ufs_quota_alloc_inode2(struct inode *ip, struct ucred *cred,
311: enum ufs_quota_flags flags)
312: {
313: struct dquot *dq;
314: int i;
315: int error;
316:
317: #ifdef DIAGNOSTIC
318: chkdquot(ip);
319: #endif
320:
321: if ((flags & UFS_QUOTA_FORCE) == 0 && cred->cr_uid != 0) {
322: for (i = 0; i < MAXQUOTAS; i++) {
323: if (flags & (1 << i))
324: continue;
325: if ((dq = ip->i_dquot[i]) == NODQUOT)
326: continue;
327: if ((error = chkiqchg(ip, 1, cred, i)) != 0)
328: return (error);
329: }
330: }
331: for (i = 0; i < MAXQUOTAS; i++) {
332: if (flags & (1 << i))
333: continue;
334: if ((dq = ip->i_dquot[i]) == NODQUOT)
335: continue;
336: while (dq->dq_flags & DQ_LOCK) {
337: dq->dq_flags |= DQ_WANT;
338: (void) tsleep(dq, PINOD+1, "chkiq", 0);
339: }
340: dq->dq_curinodes++;
341: dq->dq_flags |= DQ_MOD;
342: }
343: return (0);
344: }
345:
346: int
347: ufs_quota_free_inode2(struct inode *ip, struct ucred *cred,
348: enum ufs_quota_flags flags)
349: {
350: struct dquot *dq;
351: int i;
352:
353: #ifdef DIAGNOSTIC
354: if (!VOP_ISLOCKED(ITOV(ip)))
355: panic ("ufs_quota_free_blocks2: vnode is not locked");
356: #endif
357:
358: for (i = 0; i < MAXQUOTAS; i++) {
359: if (flags & (1 << i))
360: continue;
361: if ((dq = ip->i_dquot[i]) == NODQUOT)
362: continue;
363: while (dq->dq_flags & DQ_LOCK) {
364: dq->dq_flags |= DQ_WANT;
365: (void) tsleep(dq, PINOD+1, "chkiq", 0);
366: }
367: if (dq->dq_curinodes > 0)
368: dq->dq_curinodes--;
369: dq->dq_flags &= ~DQ_INODS;
370: dq->dq_flags |= DQ_MOD;
371: }
372: return (0);
373: }
374:
375: /*
376: * Check for a valid change to a users allocation.
377: * Issue an error message if appropriate.
378: */
379: int
380: chkiqchg(struct inode *ip, long change, struct ucred *cred, int type)
381: {
382: struct dquot *dq = ip->i_dquot[type];
383: long ncurinodes = dq->dq_curinodes + change;
384:
385: /*
386: * If user would exceed their hard limit, disallow inode allocation.
387: */
388: if (ncurinodes >= dq->dq_ihardlimit && dq->dq_ihardlimit) {
389: if ((dq->dq_flags & DQ_INODS) == 0 &&
390: DIP(ip, uid) == cred->cr_uid) {
391: uprintf("\n%s: write failed, %s inode limit reached\n",
392: ITOV(ip)->v_mount->mnt_stat.f_mntonname,
393: quotatypes[type]);
394: dq->dq_flags |= DQ_INODS;
395: }
396: return (EDQUOT);
397: }
398: /*
399: * If user is over their soft limit for too long, disallow inode
400: * allocation. Reset time limit as they cross their soft limit.
401: */
402: if (ncurinodes >= dq->dq_isoftlimit && dq->dq_isoftlimit) {
403: if (dq->dq_curinodes < dq->dq_isoftlimit) {
404: dq->dq_itime = time_second +
405: ip->i_ump->um_itime[type];
406: if (DIP(ip, uid) == cred->cr_uid)
407: uprintf("\n%s: warning, %s %s\n",
408: ITOV(ip)->v_mount->mnt_stat.f_mntonname,
409: quotatypes[type], "inode quota exceeded");
410: return (0);
411: }
412: if (time_second > dq->dq_itime) {
413: if ((dq->dq_flags & DQ_INODS) == 0 &&
414: DIP(ip, uid) == cred->cr_uid) {
415: uprintf("\n%s: write failed, %s %s\n",
416: ITOV(ip)->v_mount->mnt_stat.f_mntonname,
417: quotatypes[type],
418: "inode quota exceeded for too long");
419: dq->dq_flags |= DQ_INODS;
420: }
421: return (EDQUOT);
422: }
423: }
424: return (0);
425: }
426:
427: #ifdef DIAGNOSTIC
428: /*
429: * On filesystems with quotas enabled, it is an error for a file to change
430: * size and not to have a dquot structure associated with it.
431: */
432: void
433: chkdquot(struct inode *ip)
434: {
435: struct ufsmount *ump = ip->i_ump;
436: int i;
437: struct vnode *vp = ITOV(ip);
438:
439: if (!VOP_ISLOCKED(vp))
440: panic ("chkdquot: vnode is not locked");
441:
442: for (i = 0; i < MAXQUOTAS; i++) {
443: if (ump->um_quotas[i] == NULLVP ||
444: (ump->um_qflags[i] & (QTF_OPENING|QTF_CLOSING)))
445: continue;
446: if (ip->i_dquot[i] == NODQUOT) {
447: vprint("chkdquot: missing dquot", ITOV(ip));
448: panic("missing dquot");
449: }
450: }
451: }
452: #endif
453:
454: /*
455: * Code to process quotactl commands.
456: */
457:
458: int
459: quotaon_vnode(struct vnode *vp, void *arg)
460: {
461: int error;
462: struct proc *p = (struct proc *)arg;
463:
464: if (vp->v_type == VNON || vp->v_writecount == 0)
465: return (0);
466:
467: if (vget(vp, LK_EXCLUSIVE, p)) {
468: return (0);
469: }
470:
471: error = getinoquota(VTOI(vp));
472: vput(vp);
473:
474: return (error);
475: }
476:
477: /*
478: * Q_QUOTAON - set up a quota file for a particular file system.
479: */
480: int
481: quotaon(struct proc *p, struct mount *mp, int type, caddr_t fname)
482: {
483: struct ufsmount *ump = VFSTOUFS(mp);
484: struct vnode *vp, **vpp;
485: struct dquot *dq;
486: int error;
487: struct nameidata nd;
488:
489: #ifdef DIAGNOSTIC
490: if (!vfs_isbusy(mp))
491: panic ("quotaon: mount point not busy");
492: #endif
493:
494: vpp = &ump->um_quotas[type];
495: NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, fname, p);
496: if ((error = vn_open(&nd, FREAD|FWRITE, 0)) != 0)
497: return (error);
498: vp = nd.ni_vp;
499: VOP_UNLOCK(vp, 0, p);
500: if (vp->v_type != VREG) {
501: (void) vn_close(vp, FREAD|FWRITE, p->p_ucred, p);
502: return (EACCES);
503: }
504: if (*vpp != vp)
505: quotaoff(p, mp, type);
506: ump->um_qflags[type] |= QTF_OPENING;
507: mp->mnt_flag |= MNT_QUOTA;
508: vp->v_flag |= VSYSTEM;
509: *vpp = vp;
510: /*
511: * Save the credential of the process that turned on quotas.
512: * Set up the time limits for this quota.
513: */
514: crhold(p->p_ucred);
515: ump->um_cred[type] = p->p_ucred;
516: ump->um_btime[type] = MAX_DQ_TIME;
517: ump->um_itime[type] = MAX_IQ_TIME;
518: if (dqget(NULLVP, 0, ump, type, &dq) == 0) {
519: if (dq->dq_btime > 0)
520: ump->um_btime[type] = dq->dq_btime;
521: if (dq->dq_itime > 0)
522: ump->um_itime[type] = dq->dq_itime;
523: dqrele(NULLVP, dq);
524: }
525: /*
526: * Search vnodes associated with this mount point,
527: * adding references to quota file being opened.
528: * NB: only need to add dquot's for inodes being modified.
529: */
530: error = vfs_mount_foreach_vnode(mp, quotaon_vnode, p);
531:
532: ump->um_qflags[type] &= ~QTF_OPENING;
533: if (error)
534: quotaoff(p, mp, type);
535: return (error);
536: }
537:
538: struct quotaoff_arg {
539: struct proc *p;
540: int type;
541: };
542:
543: int
544: quotaoff_vnode(struct vnode *vp, void *arg)
545: {
546: struct quotaoff_arg *qa = (struct quotaoff_arg *)arg;
547: struct inode *ip;
548: struct dquot *dq;
549:
550: if (vp->v_type == VNON)
551: return (0);
552:
553:
554: if (vget(vp, LK_EXCLUSIVE, qa->p))
555: return (0);
556: ip = VTOI(vp);
557: dq = ip->i_dquot[qa->type];
558: ip->i_dquot[qa->type] = NODQUOT;
559: dqrele(vp, dq);
560: vput(vp);
561: return (0);
562: }
563:
564: /*
565: * Q_QUOTAOFF - turn off disk quotas for a filesystem.
566: */
567: int
568: quotaoff(struct proc *p, struct mount *mp, int type)
569: {
570: struct vnode *qvp;
571: struct ufsmount *ump = VFSTOUFS(mp);
572: struct quotaoff_arg qa;
573: int error;
574:
575: #ifdef DIAGNOSTIC
576: if (!vfs_isbusy(mp))
577: panic ("quotaoff: mount point not busy");
578: #endif
579: if ((qvp = ump->um_quotas[type]) == NULLVP)
580: return (0);
581: ump->um_qflags[type] |= QTF_CLOSING;
582: /*
583: * Search vnodes associated with this mount point,
584: * deleting any references to quota file being closed.
585: */
586: qa.p = p;
587: qa.type = type;
588: vfs_mount_foreach_vnode(mp, quotaoff_vnode, &qa);
589:
590: error = vn_close(qvp, FREAD|FWRITE, p->p_ucred, p);
591: ump->um_quotas[type] = NULLVP;
592: crfree(ump->um_cred[type]);
593: ump->um_cred[type] = NOCRED;
594: ump->um_qflags[type] &= ~QTF_CLOSING;
595: for (type = 0; type < MAXQUOTAS; type++)
596: if (ump->um_quotas[type] != NULLVP)
597: break;
598: if (type == MAXQUOTAS)
599: mp->mnt_flag &= ~MNT_QUOTA;
600: return (error);
601: }
602:
603: /*
604: * Q_GETQUOTA - return current values in a dqblk structure.
605: */
606: int
607: getquota(struct mount *mp, u_long id, int type, caddr_t addr)
608: {
609: struct dquot *dq;
610: int error;
611:
612: if ((error = dqget(NULLVP, id, VFSTOUFS(mp), type, &dq)) != 0)
613: return (error);
614: error = copyout((caddr_t)&dq->dq_dqb, addr, sizeof (struct dqblk));
615: dqrele(NULLVP, dq);
616: return (error);
617: }
618:
619: /*
620: * Q_SETQUOTA - assign an entire dqblk structure.
621: */
622: int
623: setquota(struct mount *mp, u_long id, int type, caddr_t addr)
624: {
625: struct dquot *dq;
626: struct dquot *ndq;
627: struct ufsmount *ump = VFSTOUFS(mp);
628: struct dqblk newlim;
629: int error;
630:
631: error = copyin(addr, (caddr_t)&newlim, sizeof (struct dqblk));
632: if (error)
633: return (error);
634: if ((error = dqget(NULLVP, id, ump, type, &ndq)) != 0)
635: return (error);
636: dq = ndq;
637: while (dq->dq_flags & DQ_LOCK) {
638: dq->dq_flags |= DQ_WANT;
639: (void) tsleep(dq, PINOD+1, "setquota", 0);
640: }
641: /*
642: * Copy all but the current values.
643: * Reset time limit if previously had no soft limit or were
644: * under it, but now have a soft limit and are over it.
645: */
646: newlim.dqb_curblocks = dq->dq_curblocks;
647: newlim.dqb_curinodes = dq->dq_curinodes;
648: if (dq->dq_id != 0) {
649: newlim.dqb_btime = dq->dq_btime;
650: newlim.dqb_itime = dq->dq_itime;
651: }
652: if (newlim.dqb_bsoftlimit &&
653: dq->dq_curblocks >= newlim.dqb_bsoftlimit &&
654: (dq->dq_bsoftlimit == 0 || dq->dq_curblocks < dq->dq_bsoftlimit))
655: newlim.dqb_btime = time_second + ump->um_btime[type];
656: if (newlim.dqb_isoftlimit &&
657: dq->dq_curinodes >= newlim.dqb_isoftlimit &&
658: (dq->dq_isoftlimit == 0 || dq->dq_curinodes < dq->dq_isoftlimit))
659: newlim.dqb_itime = time_second + ump->um_itime[type];
660: dq->dq_dqb = newlim;
661: if (dq->dq_curblocks < dq->dq_bsoftlimit)
662: dq->dq_flags &= ~DQ_BLKS;
663: if (dq->dq_curinodes < dq->dq_isoftlimit)
664: dq->dq_flags &= ~DQ_INODS;
665: if (dq->dq_isoftlimit == 0 && dq->dq_bsoftlimit == 0 &&
666: dq->dq_ihardlimit == 0 && dq->dq_bhardlimit == 0)
667: dq->dq_flags |= DQ_FAKE;
668: else
669: dq->dq_flags &= ~DQ_FAKE;
670: dq->dq_flags |= DQ_MOD;
671: dqrele(NULLVP, dq);
672: return (0);
673: }
674:
675: /*
676: * Q_SETUSE - set current inode and block usage.
677: */
678: int
679: setuse(struct mount *mp, u_long id, int type, caddr_t addr)
680: {
681: struct dquot *dq;
682: struct ufsmount *ump = VFSTOUFS(mp);
683: struct dquot *ndq;
684: struct dqblk usage;
685: int error;
686:
687: error = copyin(addr, (caddr_t)&usage, sizeof (struct dqblk));
688: if (error)
689: return (error);
690: if ((error = dqget(NULLVP, id, ump, type, &ndq)) != 0)
691: return (error);
692: dq = ndq;
693: while (dq->dq_flags & DQ_LOCK) {
694: dq->dq_flags |= DQ_WANT;
695: (void) tsleep(dq, PINOD+1, "setuse", 0);
696: }
697: /*
698: * Reset time limit if have a soft limit and were
699: * previously under it, but are now over it.
700: */
701: if (dq->dq_bsoftlimit && dq->dq_curblocks < dq->dq_bsoftlimit &&
702: usage.dqb_curblocks >= dq->dq_bsoftlimit)
703: dq->dq_btime = time_second + ump->um_btime[type];
704: if (dq->dq_isoftlimit && dq->dq_curinodes < dq->dq_isoftlimit &&
705: usage.dqb_curinodes >= dq->dq_isoftlimit)
706: dq->dq_itime = time_second + ump->um_itime[type];
707: dq->dq_curblocks = usage.dqb_curblocks;
708: dq->dq_curinodes = usage.dqb_curinodes;
709: if (dq->dq_curblocks < dq->dq_bsoftlimit)
710: dq->dq_flags &= ~DQ_BLKS;
711: if (dq->dq_curinodes < dq->dq_isoftlimit)
712: dq->dq_flags &= ~DQ_INODS;
713: dq->dq_flags |= DQ_MOD;
714: dqrele(NULLVP, dq);
715: return (0);
716: }
717:
718: int
719: qsync_vnode(struct vnode *vp, void *arg)
720: {
721: int i;
722: struct proc *p = curproc;
723: struct dquot *dq;
724:
725: if (vp->v_type == VNON)
726: return (0);
727:
728: if (vget(vp, LK_EXCLUSIVE | LK_NOWAIT, p))
729: return (0);
730:
731: for (i = 0; i < MAXQUOTAS; i++) {
732: dq = VTOI(vp)->i_dquot[i];
733: if (dq != NODQUOT && (dq->dq_flags & DQ_MOD))
734: dqsync(vp, dq);
735: }
736: vput(vp);
737: return (0);
738: }
739:
740: /*
741: * Q_SYNC - sync quota files to disk.
742: */
743: int
744: qsync(struct mount *mp)
745: {
746: struct ufsmount *ump = VFSTOUFS(mp);
747: int i;
748:
749: /*
750: * Check if the mount point has any quotas.
751: * If not, simply return.
752: */
753: for (i = 0; i < MAXQUOTAS; i++)
754: if (ump->um_quotas[i] != NULLVP)
755: break;
756: if (i == MAXQUOTAS)
757: return (0);
758: /*
759: * Search vnodes associated with this mount point,
760: * synchronizing any modified dquot structures.
761: */
762: vfs_mount_foreach_vnode(mp, qsync_vnode, NULL);
763: return (0);
764: }
765:
766: /*
767: * Code pertaining to management of the in-core dquot data structures.
768: */
769: #define DQHASH(dqvp, id) \
770: (&dqhashtbl[((((long)(dqvp)) >> 8) + id) & dqhash])
771: LIST_HEAD(dqhash, dquot) *dqhashtbl;
772: u_long dqhash;
773:
774: /*
775: * Dquot free list.
776: */
777: #define DQUOTINC 5 /* minimum free dquots desired */
778: TAILQ_HEAD(dqfreelist, dquot) dqfreelist;
779: long numdquot, desireddquot = DQUOTINC;
780:
781: /*
782: * Initialize the quota system.
783: */
784: void
785: ufs_quota_init(void)
786: {
787: dqhashtbl = hashinit(desiredvnodes, M_DQUOT, M_WAITOK, &dqhash);
788: TAILQ_INIT(&dqfreelist);
789: }
790:
791: /*
792: * Obtain a dquot structure for the specified identifier and quota file
793: * reading the information from the file if necessary.
794: */
795: int
796: dqget(struct vnode *vp, u_long id, struct ufsmount *ump, int type,
797: struct dquot **dqp)
798: {
799: struct proc *p = curproc;
800: struct dquot *dq;
801: struct dqhash *dqh;
802: struct vnode *dqvp;
803: struct iovec aiov;
804: struct uio auio;
805: int error;
806:
807: dqvp = ump->um_quotas[type];
808: if (dqvp == NULLVP || (ump->um_qflags[type] & QTF_CLOSING)) {
809: *dqp = NODQUOT;
810: return (EINVAL);
811: }
812: /*
813: * Check the cache first.
814: */
815: dqh = DQHASH(dqvp, id);
816: LIST_FOREACH(dq, dqh, dq_hash) {
817: if (dq->dq_id != id ||
818: dq->dq_vp != dqvp)
819: continue;
820: /*
821: * Cache hit with no references. Take
822: * the structure off the free list.
823: */
824: if (dq->dq_cnt == 0)
825: TAILQ_REMOVE(&dqfreelist, dq, dq_freelist);
826: dqref(dq);
827: *dqp = dq;
828: return (0);
829: }
830: /*
831: * Not in cache, allocate a new one.
832: */
833: if (TAILQ_FIRST(&dqfreelist) == NODQUOT &&
834: numdquot < MAXQUOTAS * desiredvnodes)
835: desireddquot += DQUOTINC;
836: if (numdquot < desireddquot) {
837: dq = (struct dquot *)malloc(sizeof *dq, M_DQUOT, M_WAITOK);
838: bzero((char *)dq, sizeof *dq);
839: numdquot++;
840: } else {
841: if ((dq = TAILQ_FIRST(&dqfreelist)) == NULL) {
842: tablefull("dquot");
843: *dqp = NODQUOT;
844: return (EUSERS);
845: }
846: if (dq->dq_cnt || (dq->dq_flags & DQ_MOD))
847: panic("free dquot isn't");
848: TAILQ_REMOVE(&dqfreelist, dq, dq_freelist);
849: LIST_REMOVE(dq, dq_hash);
850: crfree(dq->dq_cred);
851: dq->dq_cred = NOCRED;
852: }
853: /*
854: * Initialize the contents of the dquot structure.
855: */
856: if (vp != dqvp)
857: vn_lock(dqvp, LK_EXCLUSIVE | LK_RETRY, p);
858: LIST_INSERT_HEAD(dqh, dq, dq_hash);
859: dqref(dq);
860: dq->dq_flags = DQ_LOCK;
861: dq->dq_id = id;
862: dq->dq_vp = dqvp;
863: dq->dq_type = type;
864: crhold(ump->um_cred[type]);
865: dq->dq_cred = ump->um_cred[type];
866: auio.uio_iov = &aiov;
867: auio.uio_iovcnt = 1;
868: aiov.iov_base = (caddr_t)&dq->dq_dqb;
869: aiov.iov_len = sizeof (struct dqblk);
870: auio.uio_resid = sizeof (struct dqblk);
871: auio.uio_offset = (off_t)(id * sizeof (struct dqblk));
872: auio.uio_segflg = UIO_SYSSPACE;
873: auio.uio_rw = UIO_READ;
874: auio.uio_procp = (struct proc *)0;
875: error = VOP_READ(dqvp, &auio, 0, dq->dq_cred);
876: if (auio.uio_resid == sizeof(struct dqblk) && error == 0)
877: bzero((caddr_t)&dq->dq_dqb, sizeof(struct dqblk));
878: if (vp != dqvp)
879: VOP_UNLOCK(dqvp, 0, p);
880: if (dq->dq_flags & DQ_WANT)
881: wakeup(dq);
882: dq->dq_flags = 0;
883: /*
884: * I/O error in reading quota file, release
885: * quota structure and reflect problem to caller.
886: */
887: if (error) {
888: LIST_REMOVE(dq, dq_hash);
889: dqrele(vp, dq);
890: *dqp = NODQUOT;
891: return (error);
892: }
893: /*
894: * Check for no limit to enforce.
895: * Initialize time values if necessary.
896: */
897: if (dq->dq_isoftlimit == 0 && dq->dq_bsoftlimit == 0 &&
898: dq->dq_ihardlimit == 0 && dq->dq_bhardlimit == 0)
899: dq->dq_flags |= DQ_FAKE;
900: if (dq->dq_id != 0) {
901: if (dq->dq_btime == 0)
902: dq->dq_btime = time_second + ump->um_btime[type];
903: if (dq->dq_itime == 0)
904: dq->dq_itime = time_second + ump->um_itime[type];
905: }
906: *dqp = dq;
907: return (0);
908: }
909:
910: /*
911: * Release a reference to a dquot.
912: */
913: void
914: dqrele(struct vnode *vp, struct dquot *dq)
915: {
916:
917: if (dq == NODQUOT)
918: return;
919: if (dq->dq_cnt > 1) {
920: dq->dq_cnt--;
921: return;
922: }
923: if (dq->dq_flags & DQ_MOD)
924: (void) dqsync(vp, dq);
925: if (--dq->dq_cnt > 0)
926: return;
927: TAILQ_INSERT_TAIL(&dqfreelist, dq, dq_freelist);
928: }
929:
930: /*
931: * Update the disk quota in the quota file.
932: */
933: int
934: dqsync(struct vnode *vp, struct dquot *dq)
935: {
936: struct proc *p = curproc;
937: struct vnode *dqvp;
938: struct iovec aiov;
939: struct uio auio;
940: int error;
941:
942: if (dq == NODQUOT)
943: panic("dqsync: dquot");
944: if ((dq->dq_flags & DQ_MOD) == 0)
945: return (0);
946: if ((dqvp = dq->dq_vp) == NULLVP)
947: panic("dqsync: file");
948:
949: if (vp != dqvp)
950: vn_lock(dqvp, LK_EXCLUSIVE | LK_RETRY, p);
951: while (dq->dq_flags & DQ_LOCK) {
952: dq->dq_flags |= DQ_WANT;
953: (void) tsleep(dq, PINOD+2, "dqsync", 0);
954: if ((dq->dq_flags & DQ_MOD) == 0) {
955: if (vp != dqvp)
956: VOP_UNLOCK(dqvp, 0, p);
957: return (0);
958: }
959: }
960: dq->dq_flags |= DQ_LOCK;
961: auio.uio_iov = &aiov;
962: auio.uio_iovcnt = 1;
963: aiov.iov_base = (caddr_t)&dq->dq_dqb;
964: aiov.iov_len = sizeof (struct dqblk);
965: auio.uio_resid = sizeof (struct dqblk);
966: auio.uio_offset = (off_t)(dq->dq_id * sizeof (struct dqblk));
967: auio.uio_segflg = UIO_SYSSPACE;
968: auio.uio_rw = UIO_WRITE;
969: auio.uio_procp = (struct proc *)0;
970: error = VOP_WRITE(dqvp, &auio, 0, dq->dq_cred);
971: if (auio.uio_resid && error == 0)
972: error = EIO;
973: if (dq->dq_flags & DQ_WANT)
974: wakeup(dq);
975: dq->dq_flags &= ~(DQ_MOD|DQ_LOCK|DQ_WANT);
976: if (vp != dqvp)
977: VOP_UNLOCK(dqvp, 0, p);
978: return (error);
979: }
980:
981: int
982: ufs_quota_delete(struct inode *ip)
983: {
984: struct vnode *vp = ITOV(ip);
985: int i;
986: for (i = 0; i < MAXQUOTAS; i++) {
987: if (ip->i_dquot[i] != NODQUOT) {
988: dqrele(vp, ip->i_dquot[i]);
989: ip->i_dquot[i] = NODQUOT;
990: }
991: }
992:
993: return (0);
994: }
995:
996: /*
997: * Do operations associated with quotas
998: */
999: int
1000: ufs_quotactl(struct mount *mp, int cmds, uid_t uid, caddr_t arg,
1001: struct proc *p)
1002: {
1003: int cmd, type, error;
1004:
1005: if (uid == -1)
1006: uid = p->p_cred->p_ruid;
1007: cmd = cmds >> SUBCMDSHIFT;
1008:
1009: switch (cmd) {
1010: case Q_SYNC:
1011: break;
1012: case Q_GETQUOTA:
1013: if (uid == p->p_cred->p_ruid)
1014: break;
1015: /* FALLTHROUGH */
1016: default:
1017: if ((error = suser(p, 0)) != 0)
1018: return (error);
1019: }
1020:
1021: type = cmds & SUBCMDMASK;
1022: if ((u_int)type >= MAXQUOTAS)
1023: return (EINVAL);
1024:
1025: if (vfs_busy(mp, VB_READ|VB_NOWAIT))
1026: return (0);
1027:
1028:
1029: switch (cmd) {
1030:
1031: case Q_QUOTAON:
1032: error = quotaon(p, mp, type, arg);
1033: break;
1034:
1035: case Q_QUOTAOFF:
1036: error = quotaoff(p, mp, type);
1037: break;
1038:
1039: case Q_SETQUOTA:
1040: error = setquota(mp, uid, type, arg) ;
1041: break;
1042:
1043: case Q_SETUSE:
1044: error = setuse(mp, uid, type, arg);
1045: break;
1046:
1047: case Q_GETQUOTA:
1048: error = getquota(mp, uid, type, arg);
1049: break;
1050:
1051: case Q_SYNC:
1052: error = qsync(mp);
1053: break;
1054:
1055: default:
1056: error = EINVAL;
1057: break;
1058: }
1059:
1060: vfs_unbusy(mp);
1061: return (error);
1062: }
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