Annotation of sys/ufs/ufs/ufs_quota.c, Revision 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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