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 1.10 2003/08/20 09:56:34 rob Exp $ 39 */ 40 41 #include <sys/param.h> 42 #include <sys/systm.h> 43 #include <sys/kernel.h> 44 #include <sys/malloc.h> 45 #include <sys/fcntl.h> 46 #include <sys/proc.h> 47 #include <sys/namei.h> 48 #include <sys/vnode.h> 49 #include <sys/mount.h> 50 #include <vm/vm_zone.h> 51 52 #include "quota.h" 53 #include "inode.h" 54 #include "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 (struct inode *, long, struct ucred *, int); 64 static int chkiqchg (struct inode *, long, struct ucred *, int); 65 static int dqget (struct vnode *, 66 u_long, struct ufsmount *, int, struct dquot **); 67 static int dqsync (struct vnode *, struct dquot *); 68 static void dqflush (struct vnode *); 69 70 #ifdef DIAGNOSTIC 71 static void dqref (struct dquot *); 72 static void chkdquot (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 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 struct inode *ip; 119 long change; 120 struct ucred *cred; 121 int flags; 122 { 123 struct dquot *dq; 124 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, 0, "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, 0, "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 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 struct inode *ip; 240 long change; 241 struct ucred *cred; 242 int flags; 243 { 244 struct dquot *dq; 245 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, 0, "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, 0, "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 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 struct inode *ip; 363 { 364 struct ufsmount *ump = VFSTOUFS(ITOV(ip)->v_mount); 365 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(td, mp, type, fname) 388 struct thread *td; 389 struct mount *mp; 390 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 struct ucred *cred; 400 401 KKASSERT(td->td_proc); 402 cred = td->td_proc->p_ucred; 403 404 vpp = &ump->um_quotas[type]; 405 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, fname, td); 406 error = vn_open(&nd, FREAD|FWRITE, 0); 407 if (error) 408 return (error); 409 NDFREE(&nd, NDF_ONLY_PNBUF); 410 vp = nd.ni_vp; 411 VOP_UNLOCK(vp, 0, td); 412 if (vp->v_type != VREG) { 413 (void) vn_close(vp, FREAD|FWRITE, td); 414 return (EACCES); 415 } 416 if (*vpp != vp) 417 quotaoff(td, mp, type); 418 ump->um_qflags[type] |= QTF_OPENING; 419 mp->mnt_flag |= MNT_QUOTA; 420 vp->v_flag |= VSYSTEM; 421 *vpp = vp; 422 /* 423 * Save the credential of the process that turned on quotas. 424 * Set up the time limits for this quota. 425 */ 426 ump->um_cred[type] = crhold(cred); 427 ump->um_btime[type] = MAX_DQ_TIME; 428 ump->um_itime[type] = MAX_IQ_TIME; 429 if (dqget(NULLVP, 0, ump, type, &dq) == 0) { 430 if (dq->dq_btime > 0) 431 ump->um_btime[type] = dq->dq_btime; 432 if (dq->dq_itime > 0) 433 ump->um_itime[type] = dq->dq_itime; 434 dqrele(NULLVP, dq); 435 } 436 /* 437 * Search vnodes associated with this mount point, 438 * adding references to quota file being opened. 439 * NB: only need to add dquot's for inodes being modified. 440 */ 441 again: 442 for (vp = TAILQ_FIRST(&mp->mnt_nvnodelist); vp != NULL; vp = nextvp) { 443 nextvp = TAILQ_NEXT(vp, v_nmntvnodes); 444 if (vp->v_type == VNON || vp->v_writecount == 0) 445 continue; 446 if (vget(vp, LK_EXCLUSIVE, td)) 447 goto again; 448 error = getinoquota(VTOI(vp)); 449 if (error) { 450 vput(vp); 451 break; 452 } 453 vput(vp); 454 if (TAILQ_NEXT(vp, v_nmntvnodes) != nextvp || vp->v_mount != mp) 455 goto again; 456 } 457 ump->um_qflags[type] &= ~QTF_OPENING; 458 if (error) 459 quotaoff(td, mp, type); 460 return (error); 461 } 462 463 /* 464 * Q_QUOTAOFF - turn off disk quotas for a filesystem. 465 */ 466 int 467 quotaoff(struct thread *td, struct mount *mp, 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 struct ucred *cred; 475 int error; 476 477 KKASSERT(td->td_proc); 478 cred = td->td_proc->p_ucred; 479 480 if ((qvp = ump->um_quotas[type]) == NULLVP) 481 return (0); 482 ump->um_qflags[type] |= QTF_CLOSING; 483 /* 484 * Search vnodes associated with this mount point, 485 * deleting any references to quota file being closed. 486 */ 487 again: 488 for (vp = TAILQ_FIRST(&mp->mnt_nvnodelist); vp != NULL; vp = nextvp) { 489 nextvp = TAILQ_NEXT(vp, v_nmntvnodes); 490 if (vp->v_type == VNON) 491 continue; 492 if (vget(vp, LK_EXCLUSIVE, td)) 493 goto again; 494 ip = VTOI(vp); 495 dq = ip->i_dquot[type]; 496 ip->i_dquot[type] = NODQUOT; 497 dqrele(vp, dq); 498 vput(vp); 499 if (TAILQ_NEXT(vp, v_nmntvnodes) != nextvp || vp->v_mount != mp) 500 goto again; 501 } 502 dqflush(qvp); 503 qvp->v_flag &= ~VSYSTEM; 504 error = vn_close(qvp, FREAD|FWRITE, td); 505 ump->um_quotas[type] = NULLVP; 506 crfree(ump->um_cred[type]); 507 ump->um_cred[type] = NOCRED; 508 ump->um_qflags[type] &= ~QTF_CLOSING; 509 for (type = 0; type < MAXQUOTAS; type++) 510 if (ump->um_quotas[type] != NULLVP) 511 break; 512 if (type == MAXQUOTAS) 513 mp->mnt_flag &= ~MNT_QUOTA; 514 return (error); 515 } 516 517 /* 518 * Q_GETQUOTA - return current values in a dqblk structure. 519 */ 520 int 521 getquota(mp, id, type, addr) 522 struct mount *mp; 523 u_long id; 524 int type; 525 caddr_t addr; 526 { 527 struct dquot *dq; 528 int error; 529 530 error = dqget(NULLVP, id, VFSTOUFS(mp), type, &dq); 531 if (error) 532 return (error); 533 error = copyout((caddr_t)&dq->dq_dqb, addr, sizeof (struct dqblk)); 534 dqrele(NULLVP, dq); 535 return (error); 536 } 537 538 /* 539 * Q_SETQUOTA - assign an entire dqblk structure. 540 */ 541 int 542 setquota(mp, id, type, addr) 543 struct mount *mp; 544 u_long id; 545 int type; 546 caddr_t addr; 547 { 548 struct dquot *dq; 549 struct dquot *ndq; 550 struct ufsmount *ump = VFSTOUFS(mp); 551 struct dqblk newlim; 552 int error; 553 554 error = copyin(addr, (caddr_t)&newlim, sizeof (struct dqblk)); 555 if (error) 556 return (error); 557 error = dqget(NULLVP, id, ump, type, &ndq); 558 if (error) 559 return (error); 560 dq = ndq; 561 while (dq->dq_flags & DQ_LOCK) { 562 dq->dq_flags |= DQ_WANT; 563 (void) tsleep((caddr_t)dq, 0, "setqta", 0); 564 } 565 /* 566 * Copy all but the current values. 567 * Reset time limit if previously had no soft limit or were 568 * under it, but now have a soft limit and are over it. 569 */ 570 newlim.dqb_curblocks = dq->dq_curblocks; 571 newlim.dqb_curinodes = dq->dq_curinodes; 572 if (dq->dq_id != 0) { 573 newlim.dqb_btime = dq->dq_btime; 574 newlim.dqb_itime = dq->dq_itime; 575 } 576 if (newlim.dqb_bsoftlimit && 577 dq->dq_curblocks >= newlim.dqb_bsoftlimit && 578 (dq->dq_bsoftlimit == 0 || dq->dq_curblocks < dq->dq_bsoftlimit)) 579 newlim.dqb_btime = time_second + ump->um_btime[type]; 580 if (newlim.dqb_isoftlimit && 581 dq->dq_curinodes >= newlim.dqb_isoftlimit && 582 (dq->dq_isoftlimit == 0 || dq->dq_curinodes < dq->dq_isoftlimit)) 583 newlim.dqb_itime = time_second + ump->um_itime[type]; 584 dq->dq_dqb = newlim; 585 if (dq->dq_curblocks < dq->dq_bsoftlimit) 586 dq->dq_flags &= ~DQ_BLKS; 587 if (dq->dq_curinodes < dq->dq_isoftlimit) 588 dq->dq_flags &= ~DQ_INODS; 589 if (dq->dq_isoftlimit == 0 && dq->dq_bsoftlimit == 0 && 590 dq->dq_ihardlimit == 0 && dq->dq_bhardlimit == 0) 591 dq->dq_flags |= DQ_FAKE; 592 else 593 dq->dq_flags &= ~DQ_FAKE; 594 dq->dq_flags |= DQ_MOD; 595 dqrele(NULLVP, dq); 596 return (0); 597 } 598 599 /* 600 * Q_SETUSE - set current inode and block usage. 601 */ 602 int 603 setuse(mp, id, type, addr) 604 struct mount *mp; 605 u_long id; 606 int type; 607 caddr_t addr; 608 { 609 struct dquot *dq; 610 struct ufsmount *ump = VFSTOUFS(mp); 611 struct dquot *ndq; 612 struct dqblk usage; 613 int error; 614 615 error = copyin(addr, (caddr_t)&usage, sizeof (struct dqblk)); 616 if (error) 617 return (error); 618 error = dqget(NULLVP, id, ump, type, &ndq); 619 if (error) 620 return (error); 621 dq = ndq; 622 while (dq->dq_flags & DQ_LOCK) { 623 dq->dq_flags |= DQ_WANT; 624 (void) tsleep((caddr_t)dq, 0, "setuse", 0); 625 } 626 /* 627 * Reset time limit if have a soft limit and were 628 * previously under it, but are now over it. 629 */ 630 if (dq->dq_bsoftlimit && dq->dq_curblocks < dq->dq_bsoftlimit && 631 usage.dqb_curblocks >= dq->dq_bsoftlimit) 632 dq->dq_btime = time_second + ump->um_btime[type]; 633 if (dq->dq_isoftlimit && dq->dq_curinodes < dq->dq_isoftlimit && 634 usage.dqb_curinodes >= dq->dq_isoftlimit) 635 dq->dq_itime = time_second + ump->um_itime[type]; 636 dq->dq_curblocks = usage.dqb_curblocks; 637 dq->dq_curinodes = usage.dqb_curinodes; 638 if (dq->dq_curblocks < dq->dq_bsoftlimit) 639 dq->dq_flags &= ~DQ_BLKS; 640 if (dq->dq_curinodes < dq->dq_isoftlimit) 641 dq->dq_flags &= ~DQ_INODS; 642 dq->dq_flags |= DQ_MOD; 643 dqrele(NULLVP, dq); 644 return (0); 645 } 646 647 /* 648 * Q_SYNC - sync quota files to disk. 649 */ 650 int 651 qsync(struct mount *mp) 652 { 653 struct ufsmount *ump = VFSTOUFS(mp); 654 struct thread *td = curthread; /* XXX */ 655 struct vnode *vp, *nextvp; 656 struct dquot *dq; 657 int i, error; 658 int gen; 659 660 /* 661 * Check if the mount point has any quotas. 662 * If not, simply return. 663 */ 664 for (i = 0; i < MAXQUOTAS; i++) 665 if (ump->um_quotas[i] != NULLVP) 666 break; 667 if (i == MAXQUOTAS) 668 return (0); 669 /* 670 * Search vnodes associated with this mount point, 671 * synchronizing any modified dquot structures. 672 */ 673 gen = lwkt_gettoken(&mntvnode_token); 674 again: 675 for (vp = TAILQ_FIRST(&mp->mnt_nvnodelist); vp != NULL; vp = nextvp) { 676 if (vp->v_mount != mp) 677 goto again; 678 nextvp = TAILQ_NEXT(vp, v_nmntvnodes); 679 if (vp->v_type == VNON) 680 continue; 681 lwkt_gettoken(&vp->v_interlock); 682 if (lwkt_gentoken(&mntvnode_token, &gen) != 0) { 683 lwkt_reltoken(&vp->v_interlock); 684 goto again; 685 } 686 error = vget(vp, LK_EXCLUSIVE | LK_NOWAIT | LK_INTERLOCK, td); 687 if (error) { 688 if (error == ENOENT) { 689 lwkt_gentoken(&mntvnode_token, &gen); 690 goto again; 691 } 692 continue; 693 } 694 for (i = 0; i < MAXQUOTAS; i++) { 695 dq = VTOI(vp)->i_dquot[i]; 696 if (dq != NODQUOT && (dq->dq_flags & DQ_MOD)) 697 dqsync(vp, dq); 698 } 699 vput(vp); 700 lwkt_gentoken(&mntvnode_token, &gen); 701 if (TAILQ_NEXT(vp, v_nmntvnodes) != nextvp) 702 goto again; 703 } 704 lwkt_reltoken(&mntvnode_token); 705 return (0); 706 } 707 708 /* 709 * Code pertaining to management of the in-core dquot data structures. 710 */ 711 #define DQHASH(dqvp, id) \ 712 (&dqhashtbl[((((intptr_t)(dqvp)) >> 8) + id) & dqhash]) 713 static LIST_HEAD(dqhash, dquot) *dqhashtbl; 714 static u_long dqhash; 715 716 /* 717 * Dquot free list. 718 */ 719 #define DQUOTINC 5 /* minimum free dquots desired */ 720 static TAILQ_HEAD(dqfreelist, dquot) dqfreelist; 721 static long numdquot, desireddquot = DQUOTINC; 722 723 /* 724 * Initialize the quota system. 725 */ 726 void 727 dqinit() 728 { 729 730 dqhashtbl = hashinit(desiredvnodes, M_DQUOT, &dqhash); 731 TAILQ_INIT(&dqfreelist); 732 } 733 734 /* 735 * Obtain a dquot structure for the specified identifier and quota file 736 * reading the information from the file if necessary. 737 */ 738 static int 739 dqget(vp, id, ump, type, dqp) 740 struct vnode *vp; 741 u_long id; 742 struct ufsmount *ump; 743 int type; 744 struct dquot **dqp; 745 { 746 struct thread *td = curthread; /* XXX */ 747 struct dquot *dq; 748 struct dqhash *dqh; 749 struct vnode *dqvp; 750 struct iovec aiov; 751 struct uio auio; 752 int error; 753 754 dqvp = ump->um_quotas[type]; 755 if (dqvp == NULLVP || (ump->um_qflags[type] & QTF_CLOSING)) { 756 *dqp = NODQUOT; 757 return (EINVAL); 758 } 759 /* 760 * Check the cache first. 761 */ 762 dqh = DQHASH(dqvp, id); 763 for (dq = dqh->lh_first; dq; dq = dq->dq_hash.le_next) { 764 if (dq->dq_id != id || 765 dq->dq_ump->um_quotas[dq->dq_type] != dqvp) 766 continue; 767 /* 768 * Cache hit with no references. Take 769 * the structure off the free list. 770 */ 771 if (dq->dq_cnt == 0) 772 TAILQ_REMOVE(&dqfreelist, dq, dq_freelist); 773 DQREF(dq); 774 *dqp = dq; 775 return (0); 776 } 777 /* 778 * Not in cache, allocate a new one. 779 */ 780 if (dqfreelist.tqh_first == NODQUOT && 781 numdquot < MAXQUOTAS * desiredvnodes) 782 desireddquot += DQUOTINC; 783 if (numdquot < desireddquot) { 784 dq = (struct dquot *)malloc(sizeof *dq, M_DQUOT, M_WAITOK); 785 bzero((char *)dq, sizeof *dq); 786 numdquot++; 787 } else { 788 if ((dq = dqfreelist.tqh_first) == NULL) { 789 tablefull("dquot"); 790 *dqp = NODQUOT; 791 return (EUSERS); 792 } 793 if (dq->dq_cnt || (dq->dq_flags & DQ_MOD)) 794 panic("dqget: free dquot isn't"); 795 TAILQ_REMOVE(&dqfreelist, dq, dq_freelist); 796 if (dq->dq_ump != NULL) 797 LIST_REMOVE(dq, dq_hash); 798 } 799 /* 800 * Initialize the contents of the dquot structure. 801 */ 802 if (vp != dqvp) 803 vn_lock(dqvp, LK_EXCLUSIVE | LK_RETRY, td); 804 LIST_INSERT_HEAD(dqh, dq, dq_hash); 805 DQREF(dq); 806 dq->dq_flags = DQ_LOCK; 807 dq->dq_id = id; 808 dq->dq_ump = ump; 809 dq->dq_type = type; 810 auio.uio_iov = &aiov; 811 auio.uio_iovcnt = 1; 812 aiov.iov_base = (caddr_t)&dq->dq_dqb; 813 aiov.iov_len = sizeof (struct dqblk); 814 auio.uio_resid = sizeof (struct dqblk); 815 auio.uio_offset = (off_t)(id * sizeof (struct dqblk)); 816 auio.uio_segflg = UIO_SYSSPACE; 817 auio.uio_rw = UIO_READ; 818 auio.uio_td = NULL; 819 error = VOP_READ(dqvp, &auio, 0, ump->um_cred[type]); 820 if (auio.uio_resid == sizeof(struct dqblk) && error == 0) 821 bzero((caddr_t)&dq->dq_dqb, sizeof(struct dqblk)); 822 if (vp != dqvp) 823 VOP_UNLOCK(dqvp, 0, td); 824 if (dq->dq_flags & DQ_WANT) 825 wakeup((caddr_t)dq); 826 dq->dq_flags = 0; 827 /* 828 * I/O error in reading quota file, release 829 * quota structure and reflect problem to caller. 830 */ 831 if (error) { 832 LIST_REMOVE(dq, dq_hash); 833 dqrele(vp, dq); 834 *dqp = NODQUOT; 835 return (error); 836 } 837 /* 838 * Check for no limit to enforce. 839 * Initialize time values if necessary. 840 */ 841 if (dq->dq_isoftlimit == 0 && dq->dq_bsoftlimit == 0 && 842 dq->dq_ihardlimit == 0 && dq->dq_bhardlimit == 0) 843 dq->dq_flags |= DQ_FAKE; 844 if (dq->dq_id != 0) { 845 if (dq->dq_btime == 0) 846 dq->dq_btime = time_second + ump->um_btime[type]; 847 if (dq->dq_itime == 0) 848 dq->dq_itime = time_second + ump->um_itime[type]; 849 } 850 *dqp = dq; 851 return (0); 852 } 853 854 #ifdef DIAGNOSTIC 855 /* 856 * Obtain a reference to a dquot. 857 */ 858 static void 859 dqref(dq) 860 struct dquot *dq; 861 { 862 863 dq->dq_cnt++; 864 } 865 #endif 866 867 /* 868 * Release a reference to a dquot. 869 */ 870 void 871 dqrele(vp, dq) 872 struct vnode *vp; 873 struct dquot *dq; 874 { 875 876 if (dq == NODQUOT) 877 return; 878 if (dq->dq_cnt > 1) { 879 dq->dq_cnt--; 880 return; 881 } 882 if (dq->dq_flags & DQ_MOD) 883 (void) dqsync(vp, dq); 884 if (--dq->dq_cnt > 0) 885 return; 886 TAILQ_INSERT_TAIL(&dqfreelist, dq, dq_freelist); 887 } 888 889 /* 890 * Update the disk quota in the quota file. 891 */ 892 static int 893 dqsync(struct vnode *vp, struct dquot *dq) 894 { 895 struct thread *td = curthread; /* XXX */ 896 struct vnode *dqvp; 897 struct iovec aiov; 898 struct uio auio; 899 int error; 900 901 if (dq == NODQUOT) 902 panic("dqsync: dquot"); 903 if ((dq->dq_flags & DQ_MOD) == 0) 904 return (0); 905 if ((dqvp = dq->dq_ump->um_quotas[dq->dq_type]) == NULLVP) 906 panic("dqsync: file"); 907 if (vp != dqvp) 908 vn_lock(dqvp, LK_EXCLUSIVE | LK_RETRY, td); 909 while (dq->dq_flags & DQ_LOCK) { 910 dq->dq_flags |= DQ_WANT; 911 (void) tsleep((caddr_t)dq, 0, "dqsync", 0); 912 if ((dq->dq_flags & DQ_MOD) == 0) { 913 if (vp != dqvp) 914 VOP_UNLOCK(dqvp, 0, td); 915 return (0); 916 } 917 } 918 dq->dq_flags |= DQ_LOCK; 919 auio.uio_iov = &aiov; 920 auio.uio_iovcnt = 1; 921 aiov.iov_base = (caddr_t)&dq->dq_dqb; 922 aiov.iov_len = sizeof (struct dqblk); 923 auio.uio_resid = sizeof (struct dqblk); 924 auio.uio_offset = (off_t)(dq->dq_id * sizeof (struct dqblk)); 925 auio.uio_segflg = UIO_SYSSPACE; 926 auio.uio_rw = UIO_WRITE; 927 auio.uio_td = NULL; 928 error = VOP_WRITE(dqvp, &auio, 0, dq->dq_ump->um_cred[dq->dq_type]); 929 if (auio.uio_resid && error == 0) 930 error = EIO; 931 if (dq->dq_flags & DQ_WANT) 932 wakeup((caddr_t)dq); 933 dq->dq_flags &= ~(DQ_MOD|DQ_LOCK|DQ_WANT); 934 if (vp != dqvp) 935 VOP_UNLOCK(dqvp, 0, td); 936 return (error); 937 } 938 939 /* 940 * Flush all entries from the cache for a particular vnode. 941 */ 942 static void 943 dqflush(vp) 944 struct vnode *vp; 945 { 946 struct dquot *dq, *nextdq; 947 struct dqhash *dqh; 948 949 /* 950 * Move all dquot's that used to refer to this quota 951 * file off their hash chains (they will eventually 952 * fall off the head of the free list and be re-used). 953 */ 954 for (dqh = &dqhashtbl[dqhash]; dqh >= dqhashtbl; dqh--) { 955 for (dq = dqh->lh_first; dq; dq = nextdq) { 956 nextdq = dq->dq_hash.le_next; 957 if (dq->dq_ump->um_quotas[dq->dq_type] != vp) 958 continue; 959 if (dq->dq_cnt) 960 panic("dqflush: stray dquot"); 961 LIST_REMOVE(dq, dq_hash); 962 dq->dq_ump = (struct ufsmount *)0; 963 } 964 } 965 } 966