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. All advertising materials mentioning features or use of this software 17 * must display the following acknowledgement: 18 * This product includes software developed by the University of 19 * California, Berkeley and its contributors. 20 * 4. Neither the name of the University nor the names of its contributors 21 * may be used to endorse or promote products derived from this software 22 * without specific prior written permission. 23 * 24 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 27 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 34 * SUCH DAMAGE. 35 * 36 * @(#)ufs_quota.c 8.5 (Berkeley) 5/20/95 37 * $FreeBSD: src/sys/ufs/ufs/ufs_quota.c,v 1.27.2.3 2002/01/15 10:33:32 phk Exp $ 38 * $DragonFly: src/sys/vfs/ufs/ufs_quota.c,v 1.2 2003/06/17 04:29:00 dillon Exp $ 39 */ 40 41 #include <sys/param.h> 42 #include <sys/systm.h> 43 #include <sys/kernel.h> 44 #include <sys/namei.h> 45 #include <sys/malloc.h> 46 #include <sys/fcntl.h> 47 #include <sys/proc.h> 48 #include <sys/vnode.h> 49 #include <sys/mount.h> 50 #include <vm/vm_zone.h> 51 52 #include <ufs/ufs/quota.h> 53 #include <ufs/ufs/inode.h> 54 #include <ufs/ufs/ufsmount.h> 55 56 static MALLOC_DEFINE(M_DQUOT, "UFS quota", "UFS quota entries"); 57 58 /* 59 * Quota name to error message mapping. 60 */ 61 static char *quotatypes[] = INITQFNAMES; 62 63 static int chkdqchg __P((struct inode *, long, struct ucred *, int)); 64 static int chkiqchg __P((struct inode *, long, struct ucred *, int)); 65 static int dqget __P((struct vnode *, 66 u_long, struct ufsmount *, int, struct dquot **)); 67 static int dqsync __P((struct vnode *, struct dquot *)); 68 static void dqflush __P((struct vnode *)); 69 70 #ifdef DIAGNOSTIC 71 static void dqref __P((struct dquot *)); 72 static void chkdquot __P((struct inode *)); 73 #endif 74 75 /* 76 * Set up the quotas for an inode. 77 * 78 * This routine completely defines the semantics of quotas. 79 * If other criterion want to be used to establish quotas, the 80 * MAXQUOTAS value in quotas.h should be increased, and the 81 * additional dquots set up here. 82 */ 83 int 84 getinoquota(ip) 85 register struct inode *ip; 86 { 87 struct ufsmount *ump; 88 struct vnode *vp = ITOV(ip); 89 int error; 90 91 ump = VFSTOUFS(vp->v_mount); 92 /* 93 * Set up the user quota based on file uid. 94 * EINVAL means that quotas are not enabled. 95 */ 96 if (ip->i_dquot[USRQUOTA] == NODQUOT && 97 (error = 98 dqget(vp, ip->i_uid, ump, USRQUOTA, &ip->i_dquot[USRQUOTA])) && 99 error != EINVAL) 100 return (error); 101 /* 102 * Set up the group quota based on file gid. 103 * EINVAL means that quotas are not enabled. 104 */ 105 if (ip->i_dquot[GRPQUOTA] == NODQUOT && 106 (error = 107 dqget(vp, ip->i_gid, ump, GRPQUOTA, &ip->i_dquot[GRPQUOTA])) && 108 error != EINVAL) 109 return (error); 110 return (0); 111 } 112 113 /* 114 * Update disk usage, and take corrective action. 115 */ 116 int 117 chkdq(ip, change, cred, flags) 118 register struct inode *ip; 119 long change; 120 struct ucred *cred; 121 int flags; 122 { 123 register struct dquot *dq; 124 register int i; 125 int ncurblocks, error; 126 127 #ifdef DIAGNOSTIC 128 if ((flags & CHOWN) == 0) 129 chkdquot(ip); 130 #endif 131 if (change == 0) 132 return (0); 133 if (change < 0) { 134 for (i = 0; i < MAXQUOTAS; i++) { 135 if ((dq = ip->i_dquot[i]) == NODQUOT) 136 continue; 137 while (dq->dq_flags & DQ_LOCK) { 138 dq->dq_flags |= DQ_WANT; 139 (void) tsleep((caddr_t)dq, PINOD+1, "chkdq1", 0); 140 } 141 ncurblocks = dq->dq_curblocks + change; 142 if (ncurblocks >= 0) 143 dq->dq_curblocks = ncurblocks; 144 else 145 dq->dq_curblocks = 0; 146 dq->dq_flags &= ~DQ_BLKS; 147 dq->dq_flags |= DQ_MOD; 148 } 149 return (0); 150 } 151 if ((flags & FORCE) == 0 && cred->cr_uid != 0) { 152 for (i = 0; i < MAXQUOTAS; i++) { 153 if ((dq = ip->i_dquot[i]) == NODQUOT) 154 continue; 155 error = chkdqchg(ip, change, cred, i); 156 if (error) 157 return (error); 158 } 159 } 160 for (i = 0; i < MAXQUOTAS; i++) { 161 if ((dq = ip->i_dquot[i]) == NODQUOT) 162 continue; 163 while (dq->dq_flags & DQ_LOCK) { 164 dq->dq_flags |= DQ_WANT; 165 (void) tsleep((caddr_t)dq, PINOD+1, "chkdq2", 0); 166 } 167 /* Reset timer when crossing soft limit */ 168 if (dq->dq_curblocks + change >= dq->dq_bsoftlimit && 169 dq->dq_curblocks < dq->dq_bsoftlimit) 170 dq->dq_btime = time_second + 171 VFSTOUFS(ITOV(ip)->v_mount)->um_btime[i]; 172 dq->dq_curblocks += change; 173 dq->dq_flags |= DQ_MOD; 174 } 175 return (0); 176 } 177 178 /* 179 * Check for a valid change to a users allocation. 180 * Issue an error message if appropriate. 181 */ 182 static int 183 chkdqchg(ip, change, cred, type) 184 struct inode *ip; 185 long change; 186 struct ucred *cred; 187 int type; 188 { 189 register struct dquot *dq = ip->i_dquot[type]; 190 long ncurblocks = dq->dq_curblocks + change; 191 192 /* 193 * If user would exceed their hard limit, disallow space allocation. 194 */ 195 if (ncurblocks >= dq->dq_bhardlimit && dq->dq_bhardlimit) { 196 if ((dq->dq_flags & DQ_BLKS) == 0 && 197 ip->i_uid == cred->cr_uid) { 198 uprintf("\n%s: write failed, %s disk limit reached\n", 199 ITOV(ip)->v_mount->mnt_stat.f_mntonname, 200 quotatypes[type]); 201 dq->dq_flags |= DQ_BLKS; 202 } 203 return (EDQUOT); 204 } 205 /* 206 * If user is over their soft limit for too long, disallow space 207 * allocation. Reset time limit as they cross their soft limit. 208 */ 209 if (ncurblocks >= dq->dq_bsoftlimit && dq->dq_bsoftlimit) { 210 if (dq->dq_curblocks < dq->dq_bsoftlimit) { 211 dq->dq_btime = time_second + 212 VFSTOUFS(ITOV(ip)->v_mount)->um_btime[type]; 213 if (ip->i_uid == cred->cr_uid) 214 uprintf("\n%s: warning, %s %s\n", 215 ITOV(ip)->v_mount->mnt_stat.f_mntonname, 216 quotatypes[type], "disk quota exceeded"); 217 return (0); 218 } 219 if (time_second > dq->dq_btime) { 220 if ((dq->dq_flags & DQ_BLKS) == 0 && 221 ip->i_uid == cred->cr_uid) { 222 uprintf("\n%s: write failed, %s %s\n", 223 ITOV(ip)->v_mount->mnt_stat.f_mntonname, 224 quotatypes[type], 225 "disk quota exceeded for too long"); 226 dq->dq_flags |= DQ_BLKS; 227 } 228 return (EDQUOT); 229 } 230 } 231 return (0); 232 } 233 234 /* 235 * Check the inode limit, applying corrective action. 236 */ 237 int 238 chkiq(ip, change, cred, flags) 239 register struct inode *ip; 240 long change; 241 struct ucred *cred; 242 int flags; 243 { 244 register struct dquot *dq; 245 register int i; 246 int ncurinodes, error; 247 248 #ifdef DIAGNOSTIC 249 if ((flags & CHOWN) == 0) 250 chkdquot(ip); 251 #endif 252 if (change == 0) 253 return (0); 254 if (change < 0) { 255 for (i = 0; i < MAXQUOTAS; i++) { 256 if ((dq = ip->i_dquot[i]) == NODQUOT) 257 continue; 258 while (dq->dq_flags & DQ_LOCK) { 259 dq->dq_flags |= DQ_WANT; 260 (void) tsleep((caddr_t)dq, PINOD+1, "chkiq1", 0); 261 } 262 ncurinodes = dq->dq_curinodes + change; 263 if (ncurinodes >= 0) 264 dq->dq_curinodes = ncurinodes; 265 else 266 dq->dq_curinodes = 0; 267 dq->dq_flags &= ~DQ_INODS; 268 dq->dq_flags |= DQ_MOD; 269 } 270 return (0); 271 } 272 if ((flags & FORCE) == 0 && cred->cr_uid != 0) { 273 for (i = 0; i < MAXQUOTAS; i++) { 274 if ((dq = ip->i_dquot[i]) == NODQUOT) 275 continue; 276 error = chkiqchg(ip, change, cred, i); 277 if (error) 278 return (error); 279 } 280 } 281 for (i = 0; i < MAXQUOTAS; i++) { 282 if ((dq = ip->i_dquot[i]) == NODQUOT) 283 continue; 284 while (dq->dq_flags & DQ_LOCK) { 285 dq->dq_flags |= DQ_WANT; 286 (void) tsleep((caddr_t)dq, PINOD+1, "chkiq2", 0); 287 } 288 /* Reset timer when crossing soft limit */ 289 if (dq->dq_curinodes + change >= dq->dq_isoftlimit && 290 dq->dq_curinodes < dq->dq_isoftlimit) 291 dq->dq_itime = time_second + 292 VFSTOUFS(ITOV(ip)->v_mount)->um_itime[i]; 293 dq->dq_curinodes += change; 294 dq->dq_flags |= DQ_MOD; 295 } 296 return (0); 297 } 298 299 /* 300 * Check for a valid change to a users allocation. 301 * Issue an error message if appropriate. 302 */ 303 static int 304 chkiqchg(ip, change, cred, type) 305 struct inode *ip; 306 long change; 307 struct ucred *cred; 308 int type; 309 { 310 register struct dquot *dq = ip->i_dquot[type]; 311 long ncurinodes = dq->dq_curinodes + change; 312 313 /* 314 * If user would exceed their hard limit, disallow inode allocation. 315 */ 316 if (ncurinodes >= dq->dq_ihardlimit && dq->dq_ihardlimit) { 317 if ((dq->dq_flags & DQ_INODS) == 0 && 318 ip->i_uid == cred->cr_uid) { 319 uprintf("\n%s: write failed, %s inode limit reached\n", 320 ITOV(ip)->v_mount->mnt_stat.f_mntonname, 321 quotatypes[type]); 322 dq->dq_flags |= DQ_INODS; 323 } 324 return (EDQUOT); 325 } 326 /* 327 * If user is over their soft limit for too long, disallow inode 328 * allocation. Reset time limit as they cross their soft limit. 329 */ 330 if (ncurinodes >= dq->dq_isoftlimit && dq->dq_isoftlimit) { 331 if (dq->dq_curinodes < dq->dq_isoftlimit) { 332 dq->dq_itime = time_second + 333 VFSTOUFS(ITOV(ip)->v_mount)->um_itime[type]; 334 if (ip->i_uid == cred->cr_uid) 335 uprintf("\n%s: warning, %s %s\n", 336 ITOV(ip)->v_mount->mnt_stat.f_mntonname, 337 quotatypes[type], "inode quota exceeded"); 338 return (0); 339 } 340 if (time_second > dq->dq_itime) { 341 if ((dq->dq_flags & DQ_INODS) == 0 && 342 ip->i_uid == cred->cr_uid) { 343 uprintf("\n%s: write failed, %s %s\n", 344 ITOV(ip)->v_mount->mnt_stat.f_mntonname, 345 quotatypes[type], 346 "inode quota exceeded for too long"); 347 dq->dq_flags |= DQ_INODS; 348 } 349 return (EDQUOT); 350 } 351 } 352 return (0); 353 } 354 355 #ifdef DIAGNOSTIC 356 /* 357 * On filesystems with quotas enabled, it is an error for a file to change 358 * size and not to have a dquot structure associated with it. 359 */ 360 static void 361 chkdquot(ip) 362 register struct inode *ip; 363 { 364 struct ufsmount *ump = VFSTOUFS(ITOV(ip)->v_mount); 365 register int i; 366 367 for (i = 0; i < MAXQUOTAS; i++) { 368 if (ump->um_quotas[i] == NULLVP || 369 (ump->um_qflags[i] & (QTF_OPENING|QTF_CLOSING))) 370 continue; 371 if (ip->i_dquot[i] == NODQUOT) { 372 vprint("chkdquot: missing dquot", ITOV(ip)); 373 panic("chkdquot: missing dquot"); 374 } 375 } 376 } 377 #endif 378 379 /* 380 * Code to process quotactl commands. 381 */ 382 383 /* 384 * Q_QUOTAON - set up a quota file for a particular file system. 385 */ 386 int 387 quotaon(p, mp, type, fname) 388 struct proc *p; 389 struct mount *mp; 390 register int type; 391 caddr_t fname; 392 { 393 struct ufsmount *ump = VFSTOUFS(mp); 394 struct vnode *vp, **vpp; 395 struct vnode *nextvp; 396 struct dquot *dq; 397 int error; 398 struct nameidata nd; 399 400 vpp = &ump->um_quotas[type]; 401 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, fname, p); 402 error = vn_open(&nd, FREAD|FWRITE, 0); 403 if (error) 404 return (error); 405 NDFREE(&nd, NDF_ONLY_PNBUF); 406 vp = nd.ni_vp; 407 VOP_UNLOCK(vp, 0, p); 408 if (vp->v_type != VREG) { 409 (void) vn_close(vp, FREAD|FWRITE, p->p_ucred, p); 410 return (EACCES); 411 } 412 if (*vpp != vp) 413 quotaoff(p, mp, type); 414 ump->um_qflags[type] |= QTF_OPENING; 415 mp->mnt_flag |= MNT_QUOTA; 416 vp->v_flag |= VSYSTEM; 417 *vpp = vp; 418 /* 419 * Save the credential of the process that turned on quotas. 420 * Set up the time limits for this quota. 421 */ 422 crhold(p->p_ucred); 423 ump->um_cred[type] = p->p_ucred; 424 ump->um_btime[type] = MAX_DQ_TIME; 425 ump->um_itime[type] = MAX_IQ_TIME; 426 if (dqget(NULLVP, 0, ump, type, &dq) == 0) { 427 if (dq->dq_btime > 0) 428 ump->um_btime[type] = dq->dq_btime; 429 if (dq->dq_itime > 0) 430 ump->um_itime[type] = dq->dq_itime; 431 dqrele(NULLVP, dq); 432 } 433 /* 434 * Search vnodes associated with this mount point, 435 * adding references to quota file being opened. 436 * NB: only need to add dquot's for inodes being modified. 437 */ 438 again: 439 for (vp = TAILQ_FIRST(&mp->mnt_nvnodelist); vp != NULL; vp = nextvp) { 440 nextvp = TAILQ_NEXT(vp, v_nmntvnodes); 441 if (vp->v_type == VNON || vp->v_writecount == 0) 442 continue; 443 if (vget(vp, LK_EXCLUSIVE, p)) 444 goto again; 445 error = getinoquota(VTOI(vp)); 446 if (error) { 447 vput(vp); 448 break; 449 } 450 vput(vp); 451 if (TAILQ_NEXT(vp, v_nmntvnodes) != nextvp || vp->v_mount != mp) 452 goto again; 453 } 454 ump->um_qflags[type] &= ~QTF_OPENING; 455 if (error) 456 quotaoff(p, mp, type); 457 return (error); 458 } 459 460 /* 461 * Q_QUOTAOFF - turn off disk quotas for a filesystem. 462 */ 463 int 464 quotaoff(p, mp, type) 465 struct proc *p; 466 struct mount *mp; 467 register int type; 468 { 469 struct vnode *vp; 470 struct vnode *qvp, *nextvp; 471 struct ufsmount *ump = VFSTOUFS(mp); 472 struct dquot *dq; 473 struct inode *ip; 474 int error; 475 476 if ((qvp = ump->um_quotas[type]) == NULLVP) 477 return (0); 478 ump->um_qflags[type] |= QTF_CLOSING; 479 /* 480 * Search vnodes associated with this mount point, 481 * deleting any references to quota file being closed. 482 */ 483 again: 484 for (vp = TAILQ_FIRST(&mp->mnt_nvnodelist); vp != NULL; vp = nextvp) { 485 nextvp = TAILQ_NEXT(vp, v_nmntvnodes); 486 if (vp->v_type == VNON) 487 continue; 488 if (vget(vp, LK_EXCLUSIVE, p)) 489 goto again; 490 ip = VTOI(vp); 491 dq = ip->i_dquot[type]; 492 ip->i_dquot[type] = NODQUOT; 493 dqrele(vp, dq); 494 vput(vp); 495 if (TAILQ_NEXT(vp, v_nmntvnodes) != nextvp || vp->v_mount != mp) 496 goto again; 497 } 498 dqflush(qvp); 499 qvp->v_flag &= ~VSYSTEM; 500 error = vn_close(qvp, FREAD|FWRITE, p->p_ucred, p); 501 ump->um_quotas[type] = NULLVP; 502 crfree(ump->um_cred[type]); 503 ump->um_cred[type] = NOCRED; 504 ump->um_qflags[type] &= ~QTF_CLOSING; 505 for (type = 0; type < MAXQUOTAS; type++) 506 if (ump->um_quotas[type] != NULLVP) 507 break; 508 if (type == MAXQUOTAS) 509 mp->mnt_flag &= ~MNT_QUOTA; 510 return (error); 511 } 512 513 /* 514 * Q_GETQUOTA - return current values in a dqblk structure. 515 */ 516 int 517 getquota(mp, id, type, addr) 518 struct mount *mp; 519 u_long id; 520 int type; 521 caddr_t addr; 522 { 523 struct dquot *dq; 524 int error; 525 526 error = dqget(NULLVP, id, VFSTOUFS(mp), type, &dq); 527 if (error) 528 return (error); 529 error = copyout((caddr_t)&dq->dq_dqb, addr, sizeof (struct dqblk)); 530 dqrele(NULLVP, dq); 531 return (error); 532 } 533 534 /* 535 * Q_SETQUOTA - assign an entire dqblk structure. 536 */ 537 int 538 setquota(mp, id, type, addr) 539 struct mount *mp; 540 u_long id; 541 int type; 542 caddr_t addr; 543 { 544 register struct dquot *dq; 545 struct dquot *ndq; 546 struct ufsmount *ump = VFSTOUFS(mp); 547 struct dqblk newlim; 548 int error; 549 550 error = copyin(addr, (caddr_t)&newlim, sizeof (struct dqblk)); 551 if (error) 552 return (error); 553 error = dqget(NULLVP, id, ump, type, &ndq); 554 if (error) 555 return (error); 556 dq = ndq; 557 while (dq->dq_flags & DQ_LOCK) { 558 dq->dq_flags |= DQ_WANT; 559 (void) tsleep((caddr_t)dq, PINOD+1, "setqta", 0); 560 } 561 /* 562 * Copy all but the current values. 563 * Reset time limit if previously had no soft limit or were 564 * under it, but now have a soft limit and are over it. 565 */ 566 newlim.dqb_curblocks = dq->dq_curblocks; 567 newlim.dqb_curinodes = dq->dq_curinodes; 568 if (dq->dq_id != 0) { 569 newlim.dqb_btime = dq->dq_btime; 570 newlim.dqb_itime = dq->dq_itime; 571 } 572 if (newlim.dqb_bsoftlimit && 573 dq->dq_curblocks >= newlim.dqb_bsoftlimit && 574 (dq->dq_bsoftlimit == 0 || dq->dq_curblocks < dq->dq_bsoftlimit)) 575 newlim.dqb_btime = time_second + ump->um_btime[type]; 576 if (newlim.dqb_isoftlimit && 577 dq->dq_curinodes >= newlim.dqb_isoftlimit && 578 (dq->dq_isoftlimit == 0 || dq->dq_curinodes < dq->dq_isoftlimit)) 579 newlim.dqb_itime = time_second + ump->um_itime[type]; 580 dq->dq_dqb = newlim; 581 if (dq->dq_curblocks < dq->dq_bsoftlimit) 582 dq->dq_flags &= ~DQ_BLKS; 583 if (dq->dq_curinodes < dq->dq_isoftlimit) 584 dq->dq_flags &= ~DQ_INODS; 585 if (dq->dq_isoftlimit == 0 && dq->dq_bsoftlimit == 0 && 586 dq->dq_ihardlimit == 0 && dq->dq_bhardlimit == 0) 587 dq->dq_flags |= DQ_FAKE; 588 else 589 dq->dq_flags &= ~DQ_FAKE; 590 dq->dq_flags |= DQ_MOD; 591 dqrele(NULLVP, dq); 592 return (0); 593 } 594 595 /* 596 * Q_SETUSE - set current inode and block usage. 597 */ 598 int 599 setuse(mp, id, type, addr) 600 struct mount *mp; 601 u_long id; 602 int type; 603 caddr_t addr; 604 { 605 register struct dquot *dq; 606 struct ufsmount *ump = VFSTOUFS(mp); 607 struct dquot *ndq; 608 struct dqblk usage; 609 int error; 610 611 error = copyin(addr, (caddr_t)&usage, sizeof (struct dqblk)); 612 if (error) 613 return (error); 614 error = dqget(NULLVP, id, ump, type, &ndq); 615 if (error) 616 return (error); 617 dq = ndq; 618 while (dq->dq_flags & DQ_LOCK) { 619 dq->dq_flags |= DQ_WANT; 620 (void) tsleep((caddr_t)dq, PINOD+1, "setuse", 0); 621 } 622 /* 623 * Reset time limit if have a soft limit and were 624 * previously under it, but are now over it. 625 */ 626 if (dq->dq_bsoftlimit && dq->dq_curblocks < dq->dq_bsoftlimit && 627 usage.dqb_curblocks >= dq->dq_bsoftlimit) 628 dq->dq_btime = time_second + ump->um_btime[type]; 629 if (dq->dq_isoftlimit && dq->dq_curinodes < dq->dq_isoftlimit && 630 usage.dqb_curinodes >= dq->dq_isoftlimit) 631 dq->dq_itime = time_second + ump->um_itime[type]; 632 dq->dq_curblocks = usage.dqb_curblocks; 633 dq->dq_curinodes = usage.dqb_curinodes; 634 if (dq->dq_curblocks < dq->dq_bsoftlimit) 635 dq->dq_flags &= ~DQ_BLKS; 636 if (dq->dq_curinodes < dq->dq_isoftlimit) 637 dq->dq_flags &= ~DQ_INODS; 638 dq->dq_flags |= DQ_MOD; 639 dqrele(NULLVP, dq); 640 return (0); 641 } 642 643 /* 644 * Q_SYNC - sync quota files to disk. 645 */ 646 int 647 qsync(mp) 648 struct mount *mp; 649 { 650 struct ufsmount *ump = VFSTOUFS(mp); 651 struct proc *p = curproc; /* XXX */ 652 struct vnode *vp, *nextvp; 653 struct dquot *dq; 654 int i, error; 655 656 /* 657 * Check if the mount point has any quotas. 658 * If not, simply return. 659 */ 660 for (i = 0; i < MAXQUOTAS; i++) 661 if (ump->um_quotas[i] != NULLVP) 662 break; 663 if (i == MAXQUOTAS) 664 return (0); 665 /* 666 * Search vnodes associated with this mount point, 667 * synchronizing any modified dquot structures. 668 */ 669 simple_lock(&mntvnode_slock); 670 again: 671 for (vp = TAILQ_FIRST(&mp->mnt_nvnodelist); vp != NULL; vp = nextvp) { 672 if (vp->v_mount != mp) 673 goto again; 674 nextvp = TAILQ_NEXT(vp, v_nmntvnodes); 675 if (vp->v_type == VNON) 676 continue; 677 simple_lock(&vp->v_interlock); 678 simple_unlock(&mntvnode_slock); 679 error = vget(vp, LK_EXCLUSIVE | LK_NOWAIT | LK_INTERLOCK, p); 680 if (error) { 681 simple_lock(&mntvnode_slock); 682 if (error == ENOENT) 683 goto again; 684 continue; 685 } 686 for (i = 0; i < MAXQUOTAS; i++) { 687 dq = VTOI(vp)->i_dquot[i]; 688 if (dq != NODQUOT && (dq->dq_flags & DQ_MOD)) 689 dqsync(vp, dq); 690 } 691 vput(vp); 692 simple_lock(&mntvnode_slock); 693 if (TAILQ_NEXT(vp, v_nmntvnodes) != nextvp) 694 goto again; 695 } 696 simple_unlock(&mntvnode_slock); 697 return (0); 698 } 699 700 /* 701 * Code pertaining to management of the in-core dquot data structures. 702 */ 703 #define DQHASH(dqvp, id) \ 704 (&dqhashtbl[((((intptr_t)(dqvp)) >> 8) + id) & dqhash]) 705 static LIST_HEAD(dqhash, dquot) *dqhashtbl; 706 static u_long dqhash; 707 708 /* 709 * Dquot free list. 710 */ 711 #define DQUOTINC 5 /* minimum free dquots desired */ 712 static TAILQ_HEAD(dqfreelist, dquot) dqfreelist; 713 static long numdquot, desireddquot = DQUOTINC; 714 715 /* 716 * Initialize the quota system. 717 */ 718 void 719 dqinit() 720 { 721 722 dqhashtbl = hashinit(desiredvnodes, M_DQUOT, &dqhash); 723 TAILQ_INIT(&dqfreelist); 724 } 725 726 /* 727 * Obtain a dquot structure for the specified identifier and quota file 728 * reading the information from the file if necessary. 729 */ 730 static int 731 dqget(vp, id, ump, type, dqp) 732 struct vnode *vp; 733 u_long id; 734 register struct ufsmount *ump; 735 register int type; 736 struct dquot **dqp; 737 { 738 struct proc *p = curproc; /* XXX */ 739 struct dquot *dq; 740 struct dqhash *dqh; 741 struct vnode *dqvp; 742 struct iovec aiov; 743 struct uio auio; 744 int error; 745 746 dqvp = ump->um_quotas[type]; 747 if (dqvp == NULLVP || (ump->um_qflags[type] & QTF_CLOSING)) { 748 *dqp = NODQUOT; 749 return (EINVAL); 750 } 751 /* 752 * Check the cache first. 753 */ 754 dqh = DQHASH(dqvp, id); 755 for (dq = dqh->lh_first; dq; dq = dq->dq_hash.le_next) { 756 if (dq->dq_id != id || 757 dq->dq_ump->um_quotas[dq->dq_type] != dqvp) 758 continue; 759 /* 760 * Cache hit with no references. Take 761 * the structure off the free list. 762 */ 763 if (dq->dq_cnt == 0) 764 TAILQ_REMOVE(&dqfreelist, dq, dq_freelist); 765 DQREF(dq); 766 *dqp = dq; 767 return (0); 768 } 769 /* 770 * Not in cache, allocate a new one. 771 */ 772 if (dqfreelist.tqh_first == NODQUOT && 773 numdquot < MAXQUOTAS * desiredvnodes) 774 desireddquot += DQUOTINC; 775 if (numdquot < desireddquot) { 776 dq = (struct dquot *)malloc(sizeof *dq, M_DQUOT, M_WAITOK); 777 bzero((char *)dq, sizeof *dq); 778 numdquot++; 779 } else { 780 if ((dq = dqfreelist.tqh_first) == NULL) { 781 tablefull("dquot"); 782 *dqp = NODQUOT; 783 return (EUSERS); 784 } 785 if (dq->dq_cnt || (dq->dq_flags & DQ_MOD)) 786 panic("dqget: free dquot isn't"); 787 TAILQ_REMOVE(&dqfreelist, dq, dq_freelist); 788 if (dq->dq_ump != NULL) 789 LIST_REMOVE(dq, dq_hash); 790 } 791 /* 792 * Initialize the contents of the dquot structure. 793 */ 794 if (vp != dqvp) 795 vn_lock(dqvp, LK_EXCLUSIVE | LK_RETRY, p); 796 LIST_INSERT_HEAD(dqh, dq, dq_hash); 797 DQREF(dq); 798 dq->dq_flags = DQ_LOCK; 799 dq->dq_id = id; 800 dq->dq_ump = ump; 801 dq->dq_type = type; 802 auio.uio_iov = &aiov; 803 auio.uio_iovcnt = 1; 804 aiov.iov_base = (caddr_t)&dq->dq_dqb; 805 aiov.iov_len = sizeof (struct dqblk); 806 auio.uio_resid = sizeof (struct dqblk); 807 auio.uio_offset = (off_t)(id * sizeof (struct dqblk)); 808 auio.uio_segflg = UIO_SYSSPACE; 809 auio.uio_rw = UIO_READ; 810 auio.uio_procp = (struct proc *)0; 811 error = VOP_READ(dqvp, &auio, 0, ump->um_cred[type]); 812 if (auio.uio_resid == sizeof(struct dqblk) && error == 0) 813 bzero((caddr_t)&dq->dq_dqb, sizeof(struct dqblk)); 814 if (vp != dqvp) 815 VOP_UNLOCK(dqvp, 0, p); 816 if (dq->dq_flags & DQ_WANT) 817 wakeup((caddr_t)dq); 818 dq->dq_flags = 0; 819 /* 820 * I/O error in reading quota file, release 821 * quota structure and reflect problem to caller. 822 */ 823 if (error) { 824 LIST_REMOVE(dq, dq_hash); 825 dqrele(vp, dq); 826 *dqp = NODQUOT; 827 return (error); 828 } 829 /* 830 * Check for no limit to enforce. 831 * Initialize time values if necessary. 832 */ 833 if (dq->dq_isoftlimit == 0 && dq->dq_bsoftlimit == 0 && 834 dq->dq_ihardlimit == 0 && dq->dq_bhardlimit == 0) 835 dq->dq_flags |= DQ_FAKE; 836 if (dq->dq_id != 0) { 837 if (dq->dq_btime == 0) 838 dq->dq_btime = time_second + ump->um_btime[type]; 839 if (dq->dq_itime == 0) 840 dq->dq_itime = time_second + ump->um_itime[type]; 841 } 842 *dqp = dq; 843 return (0); 844 } 845 846 #ifdef DIAGNOSTIC 847 /* 848 * Obtain a reference to a dquot. 849 */ 850 static void 851 dqref(dq) 852 struct dquot *dq; 853 { 854 855 dq->dq_cnt++; 856 } 857 #endif 858 859 /* 860 * Release a reference to a dquot. 861 */ 862 void 863 dqrele(vp, dq) 864 struct vnode *vp; 865 register struct dquot *dq; 866 { 867 868 if (dq == NODQUOT) 869 return; 870 if (dq->dq_cnt > 1) { 871 dq->dq_cnt--; 872 return; 873 } 874 if (dq->dq_flags & DQ_MOD) 875 (void) dqsync(vp, dq); 876 if (--dq->dq_cnt > 0) 877 return; 878 TAILQ_INSERT_TAIL(&dqfreelist, dq, dq_freelist); 879 } 880 881 /* 882 * Update the disk quota in the quota file. 883 */ 884 static int 885 dqsync(vp, dq) 886 struct vnode *vp; 887 struct dquot *dq; 888 { 889 struct proc *p = curproc; /* XXX */ 890 struct vnode *dqvp; 891 struct iovec aiov; 892 struct uio auio; 893 int error; 894 895 if (dq == NODQUOT) 896 panic("dqsync: dquot"); 897 if ((dq->dq_flags & DQ_MOD) == 0) 898 return (0); 899 if ((dqvp = dq->dq_ump->um_quotas[dq->dq_type]) == NULLVP) 900 panic("dqsync: file"); 901 if (vp != dqvp) 902 vn_lock(dqvp, LK_EXCLUSIVE | LK_RETRY, p); 903 while (dq->dq_flags & DQ_LOCK) { 904 dq->dq_flags |= DQ_WANT; 905 (void) tsleep((caddr_t)dq, PINOD+2, "dqsync", 0); 906 if ((dq->dq_flags & DQ_MOD) == 0) { 907 if (vp != dqvp) 908 VOP_UNLOCK(dqvp, 0, p); 909 return (0); 910 } 911 } 912 dq->dq_flags |= DQ_LOCK; 913 auio.uio_iov = &aiov; 914 auio.uio_iovcnt = 1; 915 aiov.iov_base = (caddr_t)&dq->dq_dqb; 916 aiov.iov_len = sizeof (struct dqblk); 917 auio.uio_resid = sizeof (struct dqblk); 918 auio.uio_offset = (off_t)(dq->dq_id * sizeof (struct dqblk)); 919 auio.uio_segflg = UIO_SYSSPACE; 920 auio.uio_rw = UIO_WRITE; 921 auio.uio_procp = (struct proc *)0; 922 error = VOP_WRITE(dqvp, &auio, 0, dq->dq_ump->um_cred[dq->dq_type]); 923 if (auio.uio_resid && error == 0) 924 error = EIO; 925 if (dq->dq_flags & DQ_WANT) 926 wakeup((caddr_t)dq); 927 dq->dq_flags &= ~(DQ_MOD|DQ_LOCK|DQ_WANT); 928 if (vp != dqvp) 929 VOP_UNLOCK(dqvp, 0, p); 930 return (error); 931 } 932 933 /* 934 * Flush all entries from the cache for a particular vnode. 935 */ 936 static void 937 dqflush(vp) 938 register struct vnode *vp; 939 { 940 register struct dquot *dq, *nextdq; 941 struct dqhash *dqh; 942 943 /* 944 * Move all dquot's that used to refer to this quota 945 * file off their hash chains (they will eventually 946 * fall off the head of the free list and be re-used). 947 */ 948 for (dqh = &dqhashtbl[dqhash]; dqh >= dqhashtbl; dqh--) { 949 for (dq = dqh->lh_first; dq; dq = nextdq) { 950 nextdq = dq->dq_hash.le_next; 951 if (dq->dq_ump->um_quotas[dq->dq_type] != vp) 952 continue; 953 if (dq->dq_cnt) 954 panic("dqflush: stray dquot"); 955 LIST_REMOVE(dq, dq_hash); 956 dq->dq_ump = (struct ufsmount *)0; 957 } 958 } 959 } 960