sys/vfs/ufs/ufs_quota.c

   1 /*
   2  * Copyright (c) 1982, 1986, 1990, 1993, 1995
   3  *      The Regents of the University of California.  All rights reserved.
   4  *
   5  * This code is derived from software contributed to Berkeley by
   6  * Robert Elz at The University of Melbourne.
   7  *
   8  * Redistribution and use in source and binary forms, with or without
   9  * modification, are permitted provided that the following conditions
  10  * are met:
  11  * 1. Redistributions of source code must retain the above copyright
  12  *    notice, this list of conditions and the following disclaimer.
  13  * 2. Redistributions in binary form must reproduce the above copyright
  14  *    notice, this list of conditions and the following disclaimer in the
  15  *    documentation and/or other materials provided with the distribution.
  16  * 3. Neither the name of the University nor the names of its contributors
  17  *    may be used to endorse or promote products derived from this software
  18  *    without specific prior written permission.
  19  *
  20  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  21  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  22  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  23  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  24  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  25  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  26  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  27  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  28  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  29  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  30  * SUCH DAMAGE.
  31  *
  32  *      @(#)ufs_quota.c 8.5 (Berkeley) 5/20/95
  33  * $FreeBSD: src/sys/ufs/ufs/ufs_quota.c,v 1.27.2.3 2002/01/15 10:33:32 phk Exp $
  34  */
  35
  36 #include <sys/param.h>
  37 #include <sys/systm.h>
  38 #include <sys/kernel.h>
  39 #include <sys/malloc.h>
  40 #include <sys/fcntl.h>
  41 #include <sys/proc.h>
  42 #include <sys/nlookup.h>
  43 #include <sys/vnode.h>
  44 #include <sys/mount.h>
  45 #include <vm/vm_zone.h>
  46
  47 #include "quota.h"
  48 #include "inode.h"
  49 #include "ufsmount.h"
  50
  51 static MALLOC_DEFINE(M_DQUOT, "UFS quota", "UFS quota entries");
  52
  53 /*
  54  * Quota name to error message mapping.
  55  */
  56 static char *quotatypes[] = INITQFNAMES;
  57
  58 static int ufs_chkdqchg (struct inode *, long, struct ucred *, int);
  59 static int ufs_chkiqchg (struct inode *, long, struct ucred *, int);
  60 static int ufs_dqget (struct vnode *,
  61                 u_long, struct ufsmount *, int, struct ufs_dquot **);
  62 static int ufs_dqsync (struct vnode *, struct ufs_dquot *);
  63 static void ufs_dqflush (struct vnode *);
  64 static void ufs_quotawarn(struct ufs_dquot *dq);
  65
  66 #ifdef DIAGNOSTIC
  67 static void ufs_dqref (struct ufs_dquot *);
  68 static void ufs_chkdquot (struct inode *);
  69 #endif
  70
  71 /*
  72  * Set up the quotas for an inode.
  73  *
  74  * This routine completely defines the semantics of quotas.
  75  * If other criterion want to be used to establish quotas, the
  76  * MAXQUOTAS value in quotas.h should be increased, and the
  77  * additional dquots set up here.
  78  */
  79 int
  80 ufs_getinoquota(struct inode *ip)
  81 {
  82         struct ufsmount *ump;
  83         struct vnode *vp = ITOV(ip);
  84         int error;
  85
  86         ump = VFSTOUFS(vp->v_mount);
  87         /*
  88          * Set up the user quota based on file uid.
  89          * EINVAL means that quotas are not enabled.
  90          */
  91         if (ip->i_dquot[USRQUOTA] == NODQUOT &&
  92             (error = ufs_dqget(vp, ip->i_uid, ump, USRQUOTA, &ip->i_dquot[USRQUOTA])) &&
  93             error != EINVAL)
  94                 return (error);
  95         /*
  96          * Set up the group quota based on file gid.
  97          * EINVAL means that quotas are not enabled.
  98          */
  99         if (ip->i_dquot[GRPQUOTA] == NODQUOT &&
 100             (error = ufs_dqget(vp, ip->i_gid, ump, GRPQUOTA, &ip->i_dquot[GRPQUOTA])) &&
 101             error != EINVAL)
 102                 return (error);
 103         return (0);
 104 }
 105
 106 /*
 107  * Update disk usage, and take corrective action.
 108  */
 109 int
 110 ufs_chkdq(struct inode *ip, long change, struct ucred *cred, int flags)
 111 {
 112         struct ufs_dquot *dq;
 113         int i;
 114         int ncurblocks, error;
 115
 116 #ifdef DIAGNOSTIC
 117         if ((flags & CHOWN) == 0)
 118                 ufs_chkdquot(ip);
 119 #endif
 120         if (change == 0)
 121                 return (0);
 122         if (change < 0) {
 123                 for (i = 0; i < MAXQUOTAS; i++) {
 124                         if ((dq = ip->i_dquot[i]) == NODQUOT)
 125                                 continue;
 126                         if (dq->dq_ump->um_quotas[dq->dq_type] == ip->i_vnode) {
 127                                 ufs_quotawarn(dq);
 128                                 continue;
 129                         }
 130                         while (dq->dq_flags & DQ_LOCK) {
 131                                 dq->dq_flags |= DQ_WANT;
 132                                 (void) tsleep((caddr_t)dq, 0, "chkdq1", 0);
 133                         }
 134                         ncurblocks = dq->dq_curblocks + change;
 135                         if (ncurblocks >= 0)
 136                                 dq->dq_curblocks = ncurblocks;
 137                         else
 138                                 dq->dq_curblocks = 0;
 139                         dq->dq_flags &= ~DQ_BLKS;
 140                         dq->dq_flags |= DQ_MOD;
 141                 }
 142                 return (0);
 143         }
 144         if ((flags & FORCE) == 0 && cred->cr_uid != 0) {
 145                 for (i = 0; i < MAXQUOTAS; i++) {
 146                         if ((dq = ip->i_dquot[i]) == NODQUOT)
 147                                 continue;
 148                         if (dq->dq_ump->um_quotas[dq->dq_type] == ip->i_vnode) {
 149                                 ufs_quotawarn(dq);
 150                                 continue;
 151                         }
 152                         error = ufs_chkdqchg(ip, change, cred, i);
 153                         if (error)
 154                                 return (error);
 155                 }
 156         }
 157         for (i = 0; i < MAXQUOTAS; i++) {
 158                 if ((dq = ip->i_dquot[i]) == NODQUOT)
 159                         continue;
 160                 if (dq->dq_ump->um_quotas[dq->dq_type] == ip->i_vnode) {
 161                         ufs_quotawarn(dq);
 162                         continue;
 163                 }
 164                 while (dq->dq_flags & DQ_LOCK) {
 165                         dq->dq_flags |= DQ_WANT;
 166                         (void) tsleep((caddr_t)dq, 0, "chkdq2", 0);
 167                 }
 168                 /* Reset timer when crossing soft limit */
 169                 if (dq->dq_curblocks + change >= dq->dq_bsoftlimit &&
 170                     dq->dq_curblocks < dq->dq_bsoftlimit)
 171                         dq->dq_btime = time_second +
 172                             VFSTOUFS(ITOV(ip)->v_mount)->um_btime[i];
 173                 dq->dq_curblocks += change;
 174                 dq->dq_flags |= DQ_MOD;
 175         }
 176         return (0);
 177 }
 178
 179 /*
 180  * Check for a valid change to a users allocation.
 181  * Issue an error message if appropriate.
 182  */
 183 static int
 184 ufs_chkdqchg(struct inode *ip, long change, struct ucred *cred, int type)
 185 {
 186         struct ufs_dquot *dq = ip->i_dquot[type];
 187         long ncurblocks = dq->dq_curblocks + change;
 188
 189         /*
 190          * If user would exceed their hard limit, disallow space allocation.
 191          */
 192         if (ncurblocks >= dq->dq_bhardlimit && dq->dq_bhardlimit) {
 193                 if ((dq->dq_flags & DQ_BLKS) == 0 &&
 194                     ip->i_uid == cred->cr_uid) {
 195                         uprintf("\n%s: write failed, %s disk limit reached\n",
 196                             ITOV(ip)->v_mount->mnt_stat.f_mntfromname,
 197                             quotatypes[type]);
 198                         dq->dq_flags |= DQ_BLKS;
 199                 }
 200                 return (EDQUOT);
 201         }
 202         /*
 203          * If user is over their soft limit for too long, disallow space
 204          * allocation. Reset time limit as they cross their soft limit.
 205          */
 206         if (ncurblocks >= dq->dq_bsoftlimit && dq->dq_bsoftlimit) {
 207                 if (dq->dq_curblocks < dq->dq_bsoftlimit) {
 208                         dq->dq_btime = time_second +
 209                             VFSTOUFS(ITOV(ip)->v_mount)->um_btime[type];
 210                         if (ip->i_uid == cred->cr_uid)
 211                                 uprintf("\n%s: warning, %s %s\n",
 212                                     ITOV(ip)->v_mount->mnt_stat.f_mntfromname,
 213                                     quotatypes[type], "disk quota exceeded");
 214                         return (0);
 215                 }
 216                 if (time_second > dq->dq_btime) {
 217                         if ((dq->dq_flags & DQ_BLKS) == 0 &&
 218                             ip->i_uid == cred->cr_uid) {
 219                                 uprintf("\n%s: write failed, %s %s\n",
 220                                     ITOV(ip)->v_mount->mnt_stat.f_mntfromname,
 221                                     quotatypes[type],
 222                                     "disk quota exceeded for too long");
 223                                 dq->dq_flags |= DQ_BLKS;
 224                         }
 225                         return (EDQUOT);
 226                 }
 227         }
 228         return (0);
 229 }
 230
 231 /*
 232  * Check the inode limit, applying corrective action.
 233  */
 234 int
 235 ufs_chkiq(struct inode *ip, long change, struct ucred *cred, int flags)
 236 {
 237         struct ufs_dquot *dq;
 238         int i;
 239         int ncurinodes, error;
 240
 241 #ifdef DIAGNOSTIC
 242         if ((flags & CHOWN) == 0)
 243                 ufs_chkdquot(ip);
 244 #endif
 245         if (change == 0)
 246                 return (0);
 247         if (change < 0) {
 248                 for (i = 0; i < MAXQUOTAS; i++) {
 249                         if ((dq = ip->i_dquot[i]) == NODQUOT)
 250                                 continue;
 251                         if (dq->dq_ump->um_quotas[dq->dq_type] == ip->i_vnode) {
 252                                 ufs_quotawarn(dq);
 253                                 continue;
 254                         }
 255                         while (dq->dq_flags & DQ_LOCK) {
 256                                 dq->dq_flags |= DQ_WANT;
 257                                 (void) tsleep((caddr_t)dq, 0, "chkiq1", 0);
 258                         }
 259                         ncurinodes = dq->dq_curinodes + change;
 260                         if (ncurinodes >= 0)
 261                                 dq->dq_curinodes = ncurinodes;
 262                         else
 263                                 dq->dq_curinodes = 0;
 264                         dq->dq_flags &= ~DQ_INODS;
 265                         dq->dq_flags |= DQ_MOD;
 266                 }
 267                 return (0);
 268         }
 269         if ((flags & FORCE) == 0 && cred->cr_uid != 0) {
 270                 for (i = 0; i < MAXQUOTAS; i++) {
 271                         if ((dq = ip->i_dquot[i]) == NODQUOT)
 272                                 continue;
 273                         if (dq->dq_ump->um_quotas[dq->dq_type] == ip->i_vnode) {
 274                                 ufs_quotawarn(dq);
 275                                 continue;
 276                         }
 277                         error = ufs_chkiqchg(ip, change, cred, i);
 278                         if (error)
 279                                 return (error);
 280                 }
 281         }
 282         for (i = 0; i < MAXQUOTAS; i++) {
 283                 if ((dq = ip->i_dquot[i]) == NODQUOT)
 284                         continue;
 285                 if (dq->dq_ump->um_quotas[dq->dq_type] == ip->i_vnode) {
 286                         ufs_quotawarn(dq);
 287                         continue;
 288                 }
 289                 while (dq->dq_flags & DQ_LOCK) {
 290                         dq->dq_flags |= DQ_WANT;
 291                         (void) tsleep((caddr_t)dq, 0, "chkiq2", 0);
 292                 }
 293                 /* Reset timer when crossing soft limit */
 294                 if (dq->dq_curinodes + change >= dq->dq_isoftlimit &&
 295                     dq->dq_curinodes < dq->dq_isoftlimit)
 296                         dq->dq_itime = time_second +
 297                             VFSTOUFS(ITOV(ip)->v_mount)->um_itime[i];
 298                 dq->dq_curinodes += change;
 299                 dq->dq_flags |= DQ_MOD;
 300         }
 301         return (0);
 302 }
 303
 304 /*
 305  * Check for a valid change to a users allocation.
 306  * Issue an error message if appropriate.
 307  */
 308 static int
 309 ufs_chkiqchg(struct inode *ip, long change, struct ucred *cred, int type)
 310 {
 311         struct ufs_dquot *dq = ip->i_dquot[type];
 312         long ncurinodes = dq->dq_curinodes + change;
 313
 314         /*
 315          * If user would exceed their hard limit, disallow inode allocation.
 316          */
 317         if (ncurinodes >= dq->dq_ihardlimit && dq->dq_ihardlimit) {
 318                 if ((dq->dq_flags & DQ_INODS) == 0 &&
 319                     ip->i_uid == cred->cr_uid) {
 320                         uprintf("\n%s: write failed, %s inode limit reached\n",
 321                             ITOV(ip)->v_mount->mnt_stat.f_mntfromname,
 322                             quotatypes[type]);
 323                         dq->dq_flags |= DQ_INODS;
 324                 }
 325                 return (EDQUOT);
 326         }
 327         /*
 328          * If user is over their soft limit for too long, disallow inode
 329          * allocation. Reset time limit as they cross their soft limit.
 330          */
 331         if (ncurinodes >= dq->dq_isoftlimit && dq->dq_isoftlimit) {
 332                 if (dq->dq_curinodes < dq->dq_isoftlimit) {
 333                         dq->dq_itime = time_second +
 334                             VFSTOUFS(ITOV(ip)->v_mount)->um_itime[type];
 335                         if (ip->i_uid == cred->cr_uid)
 336                                 uprintf("\n%s: warning, %s %s\n",
 337                                     ITOV(ip)->v_mount->mnt_stat.f_mntfromname,
 338                                     quotatypes[type], "inode quota exceeded");
 339                         return (0);
 340                 }
 341                 if (time_second > dq->dq_itime) {
 342                         if ((dq->dq_flags & DQ_INODS) == 0 &&
 343                             ip->i_uid == cred->cr_uid) {
 344                                 uprintf("\n%s: write failed, %s %s\n",
 345                                     ITOV(ip)->v_mount->mnt_stat.f_mntfromname,
 346                                     quotatypes[type],
 347                                     "inode quota exceeded for too long");
 348                                 dq->dq_flags |= DQ_INODS;
 349                         }
 350                         return (EDQUOT);
 351                 }
 352         }
 353         return (0);
 354 }
 355
 356 /*
 357  * To avoid a deadlock we disallow quota operations on the quota file itself.
 358  * This generally means that quotacheck was not run on the filesystem.
 359  */
 360 static
 361 void
 362 ufs_quotawarn(struct ufs_dquot *dq)
 363 {
 364         static int dqticks;
 365
 366         if (dqticks != ticks / hz) {
 367                 dqticks = ticks / hz;
 368                 uprintf("%s: warning, quota file expanded, quotacheck "
 369                         "was not run!\n",
 370                         dq->dq_ump->um_mountp->mnt_stat.f_mntfromname);
 371         }
 372 }
 373
 374 #ifdef DIAGNOSTIC
 375 /*
 376  * On filesystems with quotas enabled, it is an error for a file to change
 377  * size and not to have a dquot structure associated with it.
 378  */
 379 static void
 380 ufs_chkdquot(struct inode *ip)
 381 {
 382         struct ufsmount *ump = VFSTOUFS(ITOV(ip)->v_mount);
 383         int i;
 384
 385         for (i = 0; i < MAXQUOTAS; i++) {
 386                 if (ump->um_quotas[i] == NULLVP ||
 387                     (ump->um_qflags[i] & (QTF_OPENING|QTF_CLOSING)))
 388                         continue;
 389                 if (ip->i_dquot[i] == NODQUOT) {
 390                         vprint("chkdquot: missing dquot", ITOV(ip));
 391                         panic("chkdquot: missing dquot");
 392                 }
 393         }
 394 }
 395 #endif
 396
 397 /*
 398  * Code to process quotactl commands.
 399  */
 400
 401 struct scaninfo {
 402         int rescan;
 403         int type;
 404 };
 405
 406 /*
 407  * Q_QUOTAON - set up a quota file for a particular filesystem.
 408  */
 409 static int ufs_quotaon_scan(struct mount *mp, struct vnode *vp, void *data);
 410
 411 int
 412 ufs_quotaon(struct ucred *cred, struct mount *mp, int type, caddr_t fname)
 413 {
 414         struct ufsmount *ump = VFSTOUFS(mp);
 415         struct vnode *vp, **vpp;
 416         struct ufs_dquot *dq;
 417         int error;
 418         struct nlookupdata nd;
 419         struct scaninfo scaninfo;
 420
 421         vpp = &ump->um_quotas[type];
 422         error = nlookup_init(&nd, fname, UIO_USERSPACE, NLC_FOLLOW|NLC_LOCKVP);
 423         if (error == 0)
 424                 error = vn_open(&nd, NULL, FREAD|FWRITE, 0);
 425         if (error == 0 && nd.nl_open_vp->v_type != VREG)
 426                 error = EACCES;
 427         if (error) {
 428                 nlookup_done(&nd);
 429                 return (error);
 430         }
 431         vp = nd.nl_open_vp;
 432         nd.nl_open_vp = NULL;
 433         nlookup_done(&nd);
 434
 435         vn_unlock(vp);
 436         if (*vpp != vp)
 437                 ufs_quotaoff(mp, type);
 438         ump->um_qflags[type] |= QTF_OPENING;
 439         mp->mnt_flag |= MNT_QUOTA;
 440         vsetflags(vp, VSYSTEM);
 441         *vpp = vp;
 442         /* XXX release duplicate vp if *vpp == vp? */
 443         /*
 444          * Save the credential of the process that turned on quotas.
 445          * Set up the time limits for this quota.
 446          */
 447         ump->um_cred[type] = crhold(cred);
 448         ump->um_btime[type] = MAX_DQ_TIME;
 449         ump->um_itime[type] = MAX_IQ_TIME;
 450         if (ufs_dqget(NULLVP, 0, ump, type, &dq) == 0) {
 451                 if (dq->dq_btime > 0)
 452                         ump->um_btime[type] = dq->dq_btime;
 453                 if (dq->dq_itime > 0)
 454                         ump->um_itime[type] = dq->dq_itime;
 455                 ufs_dqrele(NULLVP, dq);
 456         }
 457         /*
 458          * Search vnodes associated with this mount point,
 459          * adding references to quota file being opened.
 460          * NB: only need to add dquot's for inodes being modified.
 461          */
 462         scaninfo.rescan = 1;
 463         while (scaninfo.rescan) {
 464                 scaninfo.rescan = 0;
 465                 error = vmntvnodescan(mp, VMSC_GETVP,
 466                                         NULL, ufs_quotaon_scan, &scaninfo);
 467                 if (error)
 468                         break;
 469         }
 470         ump->um_qflags[type] &= ~QTF_OPENING;
 471         if (error)
 472                 ufs_quotaoff(mp, type);
 473         return (error);
 474 }
 475
 476 static int
 477 ufs_quotaon_scan(struct mount *mp, struct vnode *vp, void *data)
 478 {
 479         int error;
 480         /*struct scaninfo *info = data;*/
 481
 482         if (vp->v_writecount == 0)
 483                 return(0);
 484         error = ufs_getinoquota(VTOI(vp));
 485         return(error);
 486 }
 487
 488 /*
 489  * Q_QUOTAOFF - turn off disk quotas for a filesystem.
 490  */
 491
 492 static int ufs_quotaoff_scan(struct mount *mp, struct vnode *vp, void *data);
 493
 494 int
 495 ufs_quotaoff(struct mount *mp, int type)
 496 {
 497         struct vnode *qvp;
 498         struct ufsmount *ump = VFSTOUFS(mp);
 499         int error;
 500         struct scaninfo scaninfo;
 501
 502         if ((qvp = ump->um_quotas[type]) == NULLVP)
 503                 return (0);
 504         ump->um_qflags[type] |= QTF_CLOSING;
 505
 506         /*
 507          * Search vnodes associated with this mount point,
 508          * deleting any references to quota file being closed.
 509          */
 510         scaninfo.rescan = 1;
 511         scaninfo.type = type;
 512         while (scaninfo.rescan) {
 513                 scaninfo.rescan = 0;
 514                 vmntvnodescan(mp, VMSC_GETVP, NULL, ufs_quotaoff_scan, &scaninfo);
 515         }
 516         ufs_dqflush(qvp);
 517         vclrflags(qvp, VSYSTEM);
 518         error = vn_close(qvp, FREAD|FWRITE, NULL);
 519         ump->um_quotas[type] = NULLVP;
 520         crfree(ump->um_cred[type]);
 521         ump->um_cred[type] = NOCRED;
 522         ump->um_qflags[type] &= ~QTF_CLOSING;
 523         for (type = 0; type < MAXQUOTAS; type++) {
 524                 if (ump->um_quotas[type] != NULLVP)
 525                         break;
 526         }
 527         if (type == MAXQUOTAS)
 528                 mp->mnt_flag &= ~MNT_QUOTA;
 529         return (error);
 530 }
 531
 532 static int
 533 ufs_quotaoff_scan(struct mount *mp, struct vnode *vp, void *data)
 534 {
 535         struct scaninfo *info = data;
 536         struct ufs_dquot *dq;
 537         struct inode *ip;
 538
 539         if (vp->v_type == VNON) {
 540                 return(0);
 541         }
 542         ip = VTOI(vp);
 543         dq = ip->i_dquot[info->type];
 544         ip->i_dquot[info->type] = NODQUOT;
 545         ufs_dqrele(vp, dq);
 546         return(0);
 547 }
 548
 549 /*
 550  * Q_GETQUOTA - return current values in a dqblk structure.
 551  */
 552 int
 553 ufs_getquota(struct mount *mp, u_long id, int type, caddr_t addr)
 554 {
 555         struct ufs_dquot *dq;
 556         int error;
 557
 558         error = ufs_dqget(NULLVP, id, VFSTOUFS(mp), type, &dq);
 559         if (error)
 560                 return (error);
 561         error = copyout((caddr_t)&dq->dq_dqb, addr, sizeof (struct ufs_dqblk));
 562         ufs_dqrele(NULLVP, dq);
 563         return (error);
 564 }
 565
 566 /*
 567  * Q_SETQUOTA - assign an entire dqblk structure.
 568  */
 569 int
 570 ufs_setquota(struct mount *mp, u_long id, int type, caddr_t addr)
 571 {
 572         struct ufs_dquot *dq;
 573         struct ufs_dquot *ndq;
 574         struct ufsmount *ump = VFSTOUFS(mp);
 575         struct ufs_dqblk newlim;
 576         int error;
 577
 578         error = copyin(addr, (caddr_t)&newlim, sizeof (struct ufs_dqblk));
 579         if (error)
 580                 return (error);
 581         error = ufs_dqget(NULLVP, id, ump, type, &ndq);
 582         if (error)
 583                 return (error);
 584         dq = ndq;
 585         while (dq->dq_flags & DQ_LOCK) {
 586                 dq->dq_flags |= DQ_WANT;
 587                 (void) tsleep((caddr_t)dq, 0, "setqta", 0);
 588         }
 589         /*
 590          * Copy all but the current values.
 591          * Reset time limit if previously had no soft limit or were
 592          * under it, but now have a soft limit and are over it.
 593          */
 594         newlim.dqb_curblocks = dq->dq_curblocks;
 595         newlim.dqb_curinodes = dq->dq_curinodes;
 596         if (dq->dq_id != 0) {
 597                 newlim.dqb_btime = dq->dq_btime;
 598                 newlim.dqb_itime = dq->dq_itime;
 599         }
 600         if (newlim.dqb_bsoftlimit &&
 601             dq->dq_curblocks >= newlim.dqb_bsoftlimit &&
 602             (dq->dq_bsoftlimit == 0 || dq->dq_curblocks < dq->dq_bsoftlimit))
 603                 newlim.dqb_btime = time_second + ump->um_btime[type];
 604         if (newlim.dqb_isoftlimit &&
 605             dq->dq_curinodes >= newlim.dqb_isoftlimit &&
 606             (dq->dq_isoftlimit == 0 || dq->dq_curinodes < dq->dq_isoftlimit))
 607                 newlim.dqb_itime = time_second + ump->um_itime[type];
 608         dq->dq_dqb = newlim;
 609         if (dq->dq_curblocks < dq->dq_bsoftlimit)
 610                 dq->dq_flags &= ~DQ_BLKS;
 611         if (dq->dq_curinodes < dq->dq_isoftlimit)
 612                 dq->dq_flags &= ~DQ_INODS;
 613         if (dq->dq_isoftlimit == 0 && dq->dq_bsoftlimit == 0 &&
 614             dq->dq_ihardlimit == 0 && dq->dq_bhardlimit == 0)
 615                 dq->dq_flags |= DQ_FAKE;
 616         else
 617                 dq->dq_flags &= ~DQ_FAKE;
 618         dq->dq_flags |= DQ_MOD;
 619         ufs_dqrele(NULLVP, dq);
 620         return (0);
 621 }
 622
 623 /*
 624  * Q_SETUSE - set current inode and block usage.
 625  */
 626 int
 627 ufs_setuse(struct mount *mp, u_long id, int type, caddr_t addr)
 628 {
 629         struct ufs_dquot *dq;
 630         struct ufsmount *ump = VFSTOUFS(mp);
 631         struct ufs_dquot *ndq;
 632         struct ufs_dqblk usage;
 633         int error;
 634
 635         error = copyin(addr, (caddr_t)&usage, sizeof (struct ufs_dqblk));
 636         if (error)
 637                 return (error);
 638         error = ufs_dqget(NULLVP, id, ump, type, &ndq);
 639         if (error)
 640                 return (error);
 641         dq = ndq;
 642         while (dq->dq_flags & DQ_LOCK) {
 643                 dq->dq_flags |= DQ_WANT;
 644                 (void) tsleep((caddr_t)dq, 0, "setuse", 0);
 645         }
 646         /*
 647          * Reset time limit if have a soft limit and were
 648          * previously under it, but are now over it.
 649          */
 650         if (dq->dq_bsoftlimit && dq->dq_curblocks < dq->dq_bsoftlimit &&
 651             usage.dqb_curblocks >= dq->dq_bsoftlimit)
 652                 dq->dq_btime = time_second + ump->um_btime[type];
 653         if (dq->dq_isoftlimit && dq->dq_curinodes < dq->dq_isoftlimit &&
 654             usage.dqb_curinodes >= dq->dq_isoftlimit)
 655                 dq->dq_itime = time_second + ump->um_itime[type];
 656         dq->dq_curblocks = usage.dqb_curblocks;
 657         dq->dq_curinodes = usage.dqb_curinodes;
 658         if (dq->dq_curblocks < dq->dq_bsoftlimit)
 659                 dq->dq_flags &= ~DQ_BLKS;
 660         if (dq->dq_curinodes < dq->dq_isoftlimit)
 661                 dq->dq_flags &= ~DQ_INODS;
 662         dq->dq_flags |= DQ_MOD;
 663         ufs_dqrele(NULLVP, dq);
 664         return (0);
 665 }
 666
 667 /*
 668  * Q_SYNC - sync quota files to disk.
 669  */
 670
 671 static int ufs_qsync_scan(struct mount *mp, struct vnode *vp, void *data);
 672
 673 int
 674 ufs_qsync(struct mount *mp)
 675 {
 676         struct ufsmount *ump = VFSTOUFS(mp);
 677         struct scaninfo scaninfo;
 678         int i;
 679
 680         /*
 681          * Check if the mount point has any quotas.
 682          * If not, simply return.
 683          */
 684         for (i = 0; i < MAXQUOTAS; i++)
 685                 if (ump->um_quotas[i] != NULLVP)
 686                         break;
 687         if (i == MAXQUOTAS)
 688                 return (0);
 689         /*
 690          * Search vnodes associated with this mount point,
 691          * synchronizing any modified ufs_dquot structures.
 692          */
 693         scaninfo.rescan = 1;
 694         while (scaninfo.rescan) {
 695                 scaninfo.rescan = 0;
 696                 vmntvnodescan(mp, VMSC_GETVP|VMSC_NOWAIT,
 697                                 NULL, ufs_qsync_scan, &scaninfo);
 698         }
 699         return (0);
 700 }
 701
 702 static int
 703 ufs_qsync_scan(struct mount *mp, struct vnode *vp, void *data)
 704 {
 705         /*struct scaninfo *info = data;*/
 706         struct ufs_dquot *dq;
 707         /* int error;*/
 708         int i;
 709
 710         for (i = 0; i < MAXQUOTAS; i++) {
 711                 dq = VTOI(vp)->i_dquot[i];
 712                 if (dq != NODQUOT && (dq->dq_flags & DQ_MOD))
 713                         ufs_dqsync(vp, dq);
 714         }
 715         return(0);
 716 }
 717
 718 /*
 719  * Code pertaining to management of the in-core dquot data structures.
 720  */
 721 #define DQHASH(dqvp, id) \
 722         (&ufs_dqhashtbl[((((intptr_t)(dqvp)) >> 8) + id) & ufs_dqhash])
 723 static LIST_HEAD(ufs_dqhash, ufs_dquot) *ufs_dqhashtbl;
 724 static u_long ufs_dqhash;
 725
 726 /*
 727  * Dquot free list.
 728  */
 729 #define DQUOTINC        5       /* minimum free dquots desired */
 730 static TAILQ_HEAD(ufs_dqfreelist, ufs_dquot) ufs_dqfreelist;
 731 static long ufs_numdquot, ufs_desireddquot = DQUOTINC;
 732
 733 /*
 734  * Initialize the quota system.
 735  */
 736 void
 737 ufs_dqinit(void)
 738 {
 739         int hsize = vfs_inodehashsize();
 740
 741         ufs_dqhashtbl = hashinit(hsize, M_DQUOT, &ufs_dqhash);
 742         TAILQ_INIT(&ufs_dqfreelist);
 743 }
 744
 745 /*
 746  * Obtain a dquot structure for the specified identifier and quota file
 747  * reading the information from the file if necessary.
 748  */
 749 static int
 750 ufs_dqget(struct vnode *vp, u_long id, struct ufsmount *ump, int type,
 751       struct ufs_dquot **dqp)
 752 {
 753         struct ufs_dquot *dq;
 754         struct ufs_dqhash *dqh;
 755         struct vnode *dqvp;
 756         struct iovec aiov;
 757         struct uio auio;
 758         int error;
 759
 760         dqvp = ump->um_quotas[type];
 761         if (dqvp == NULLVP || (ump->um_qflags[type] & QTF_CLOSING)) {
 762                 *dqp = NODQUOT;
 763                 return (EINVAL);
 764         }
 765         /*
 766          * Check the cache first.
 767          */
 768         dqh = DQHASH(dqvp, id);
 769         LIST_FOREACH(dq, dqh, dq_hash) {
 770                 if (dq->dq_id != id ||
 771                     dq->dq_ump->um_quotas[dq->dq_type] != dqvp)
 772                         continue;
 773                 /*
 774                  * Cache hit with no references.  Take
 775                  * the structure off the free list.
 776                  */
 777                 if (dq->dq_cnt == 0)
 778                         TAILQ_REMOVE(&ufs_dqfreelist, dq, dq_freelist);
 779                 DQREF(dq);
 780                 *dqp = dq;
 781                 return (0);
 782         }
 783
 784         /*
 785          * Not in cache, allocate a new one.
 786          */
 787         if (TAILQ_EMPTY(&ufs_dqfreelist) &&
 788             ufs_numdquot < MAXQUOTAS * maxvnodes) {
 789                 ufs_desireddquot += DQUOTINC;
 790         }
 791         if (ufs_numdquot < ufs_desireddquot) {
 792                 dq = (struct ufs_dquot *)
 793                         kmalloc(sizeof *dq, M_DQUOT, M_WAITOK | M_ZERO);
 794                 ufs_numdquot++;
 795         } else {
 796                 if ((dq = TAILQ_FIRST(&ufs_dqfreelist)) == NULL) {
 797                         tablefull("dquot");
 798                         *dqp = NODQUOT;
 799                         return (EUSERS);
 800                 }
 801                 if (dq->dq_cnt || (dq->dq_flags & DQ_MOD))
 802                         panic("dqget: free dquot isn't");
 803                 TAILQ_REMOVE(&ufs_dqfreelist, dq, dq_freelist);
 804                 if (dq->dq_ump != NULL)
 805                         LIST_REMOVE(dq, dq_hash);
 806         }
 807         /*
 808          * Initialize the contents of the dquot structure.
 809          */
 810         if (vp != dqvp)
 811                 vn_lock(dqvp, LK_EXCLUSIVE | LK_RETRY);
 812         LIST_INSERT_HEAD(dqh, dq, dq_hash);
 813         DQREF(dq);
 814         dq->dq_flags = DQ_LOCK;
 815         dq->dq_id = id;
 816         dq->dq_ump = ump;
 817         dq->dq_type = type;
 818         auio.uio_iov = &aiov;
 819         auio.uio_iovcnt = 1;
 820         aiov.iov_base = (caddr_t)&dq->dq_dqb;
 821         aiov.iov_len = sizeof (struct ufs_dqblk);
 822         auio.uio_resid = sizeof (struct ufs_dqblk);
 823         auio.uio_offset = (off_t)(id * sizeof (struct ufs_dqblk));
 824         auio.uio_segflg = UIO_SYSSPACE;
 825         auio.uio_rw = UIO_READ;
 826         auio.uio_td = NULL;
 827         error = VOP_READ(dqvp, &auio, 0, ump->um_cred[type]);
 828         if (auio.uio_resid == sizeof(struct ufs_dqblk) && error == 0)
 829                 bzero((caddr_t)&dq->dq_dqb, sizeof(struct ufs_dqblk));
 830         if (vp != dqvp)
 831                 vn_unlock(dqvp);
 832         if (dq->dq_flags & DQ_WANT)
 833                 wakeup((caddr_t)dq);
 834         dq->dq_flags = 0;
 835         /*
 836          * I/O error in reading quota file, release
 837          * quota structure and reflect problem to caller.
 838          */
 839         if (error) {
 840                 LIST_REMOVE(dq, dq_hash);
 841                 ufs_dqrele(vp, dq);
 842                 *dqp = NODQUOT;
 843                 return (error);
 844         }
 845         /*
 846          * Check for no limit to enforce.
 847          * Initialize time values if necessary.
 848          */
 849         if (dq->dq_isoftlimit == 0 && dq->dq_bsoftlimit == 0 &&
 850             dq->dq_ihardlimit == 0 && dq->dq_bhardlimit == 0)
 851                 dq->dq_flags |= DQ_FAKE;
 852         if (dq->dq_id != 0) {
 853                 if (dq->dq_btime == 0)
 854                         dq->dq_btime = time_second + ump->um_btime[type];
 855                 if (dq->dq_itime == 0)
 856                         dq->dq_itime = time_second + ump->um_itime[type];
 857         }
 858         *dqp = dq;
 859         return (0);
 860 }
 861
 862 #ifdef DIAGNOSTIC
 863 /*
 864  * Obtain a reference to a dquot.
 865  */
 866 static void
 867 ufs_dqref(struct ufs_dquot *dq)
 868 {
 869         dq->dq_cnt++;
 870 }
 871 #endif
 872
 873 /*
 874  * Release a reference to a dquot.
 875  */
 876 void
 877 ufs_dqrele(struct vnode *vp, struct ufs_dquot *dq)
 878 {
 879         if (dq == NODQUOT)
 880                 return;
 881         if (dq->dq_cnt > 1) {
 882                 dq->dq_cnt--;
 883                 return;
 884         }
 885         if (dq->dq_flags & DQ_MOD)
 886                 (void)ufs_dqsync(vp, dq);
 887         if (--dq->dq_cnt > 0)
 888                 return;
 889         TAILQ_INSERT_TAIL(&ufs_dqfreelist, dq, dq_freelist);
 890 }
 891
 892 /*
 893  * Update the disk quota in the quota file.
 894  */
 895 static int
 896 ufs_dqsync(struct vnode *vp, struct ufs_dquot *dq)
 897 {
 898         struct vnode *dqvp;
 899         struct iovec aiov;
 900         struct uio auio;
 901         int error;
 902
 903         if (dq == NODQUOT)
 904                 panic("dqsync: dquot");
 905         if ((dq->dq_flags & DQ_MOD) == 0)
 906                 return (0);
 907         if ((dqvp = dq->dq_ump->um_quotas[dq->dq_type]) == NULLVP)
 908                 panic("dqsync: file");
 909         if (vp != dqvp)
 910                 vn_lock(dqvp, LK_EXCLUSIVE | LK_RETRY);
 911         while (dq->dq_flags & DQ_LOCK) {
 912                 dq->dq_flags |= DQ_WANT;
 913                 (void) tsleep((caddr_t)dq, 0, "dqsync", 0);
 914                 if ((dq->dq_flags & DQ_MOD) == 0) {
 915                         if (vp != dqvp)
 916                                 vn_unlock(dqvp);
 917                         return (0);
 918                 }
 919         }
 920         dq->dq_flags |= DQ_LOCK;
 921         auio.uio_iov = &aiov;
 922         auio.uio_iovcnt = 1;
 923         aiov.iov_base = (caddr_t)&dq->dq_dqb;
 924         aiov.iov_len = sizeof (struct ufs_dqblk);
 925         auio.uio_resid = sizeof (struct ufs_dqblk);
 926         auio.uio_offset = (off_t)(dq->dq_id * sizeof (struct ufs_dqblk));
 927         auio.uio_segflg = UIO_SYSSPACE;
 928         auio.uio_rw = UIO_WRITE;
 929         auio.uio_td = NULL;
 930         error = VOP_WRITE(dqvp, &auio, 0, dq->dq_ump->um_cred[dq->dq_type]);
 931         if (auio.uio_resid && error == 0)
 932                 error = EIO;
 933         if (dq->dq_flags & DQ_WANT)
 934                 wakeup((caddr_t)dq);
 935         dq->dq_flags &= ~(DQ_MOD|DQ_LOCK|DQ_WANT);
 936         if (vp != dqvp)
 937                 vn_unlock(dqvp);
 938         return (error);
 939 }
 940
 941 /*
 942  * Flush all entries from the cache for a particular vnode.
 943  */
 944 static void
 945 ufs_dqflush(struct vnode *vp)
 946 {
 947         struct ufs_dquot *dq, *nextdq;
 948         struct ufs_dqhash *dqh;
 949
 950         /*
 951          * Move all dquot's that used to refer to this quota
 952          * file off their hash chains (they will eventually
 953          * fall off the head of the free list and be re-used).
 954          */
 955         for (dqh = &ufs_dqhashtbl[ufs_dqhash]; dqh >= ufs_dqhashtbl; dqh--) {
 956                 for (dq = dqh->lh_first; dq; dq = nextdq) {
 957                         nextdq = dq->dq_hash.le_next;
 958                         if (dq->dq_ump->um_quotas[dq->dq_type] != vp)
 959                                 continue;
 960                         if (dq->dq_cnt)
 961                                 panic("dqflush: stray dquot");
 962                         LIST_REMOVE(dq, dq_hash);
 963                         dq->dq_ump = NULL;
 964                 }
 965         }
 966 }