ufs_quota.c revision 1.31
1 /* $NetBSD: ufs_quota.c,v 1.31 2004/08/15 07:19:58 mycroft Exp $ */ 2 3 /* 4 * Copyright (c) 1982, 1986, 1990, 1993, 1995 5 * The Regents of the University of California. All rights reserved. 6 * 7 * This code is derived from software contributed to Berkeley by 8 * Robert Elz at The University of Melbourne. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 3. Neither the name of the University nor the names of its contributors 19 * may be used to endorse or promote products derived from this software 20 * without specific prior written permission. 21 * 22 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 25 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 32 * SUCH DAMAGE. 33 * 34 * @(#)ufs_quota.c 8.5 (Berkeley) 5/20/95 35 */ 36 37 #include <sys/cdefs.h> 38 __KERNEL_RCSID(0, "$NetBSD: ufs_quota.c,v 1.31 2004/08/15 07:19:58 mycroft Exp $"); 39 40 #include <sys/param.h> 41 #include <sys/kernel.h> 42 #include <sys/systm.h> 43 #include <sys/namei.h> 44 #include <sys/malloc.h> 45 #include <sys/file.h> 46 #include <sys/proc.h> 47 #include <sys/vnode.h> 48 #include <sys/mount.h> 49 50 #include <ufs/ufs/quota.h> 51 #include <ufs/ufs/inode.h> 52 #include <ufs/ufs/ufsmount.h> 53 #include <ufs/ufs/ufs_extern.h> 54 55 /* 56 * Quota name to error message mapping. 57 */ 58 static char *quotatypes[] = INITQFNAMES; 59 60 /* 61 * Set up the quotas for an inode. 62 * 63 * This routine completely defines the semantics of quotas. 64 * If other criterion want to be used to establish quotas, the 65 * MAXQUOTAS value in quotas.h should be increased, and the 66 * additional dquots set up here. 67 */ 68 int 69 getinoquota(ip) 70 struct inode *ip; 71 { 72 struct ufsmount *ump = ip->i_ump; 73 struct vnode *vp = ITOV(ip); 74 int error; 75 76 /* 77 * Set up the user quota based on file uid. 78 * EINVAL means that quotas are not enabled. 79 */ 80 if (ip->i_dquot[USRQUOTA] == NODQUOT && 81 (error = 82 dqget(vp, ip->i_uid, ump, USRQUOTA, &ip->i_dquot[USRQUOTA])) && 83 error != EINVAL) 84 return (error); 85 /* 86 * Set up the group quota based on file gid. 87 * EINVAL means that quotas are not enabled. 88 */ 89 if (ip->i_dquot[GRPQUOTA] == NODQUOT && 90 (error = 91 dqget(vp, ip->i_gid, ump, GRPQUOTA, &ip->i_dquot[GRPQUOTA])) && 92 error != EINVAL) 93 return (error); 94 return (0); 95 } 96 97 /* 98 * Update disk usage, and take corrective action. 99 */ 100 int 101 chkdq(ip, change, cred, flags) 102 struct inode *ip; 103 int64_t change; 104 struct ucred *cred; 105 int flags; 106 { 107 struct dquot *dq; 108 int i; 109 int ncurblocks, error; 110 111 #ifdef DIAGNOSTIC 112 if ((flags & CHOWN) == 0) 113 chkdquot(ip); 114 #endif 115 if (change == 0) 116 return (0); 117 if (change < 0) { 118 for (i = 0; i < MAXQUOTAS; i++) { 119 if ((dq = ip->i_dquot[i]) == NODQUOT) 120 continue; 121 while (dq->dq_flags & DQ_LOCK) { 122 dq->dq_flags |= DQ_WANT; 123 (void) tsleep(dq, PINOD+1, "chkdq", 0); 124 } 125 ncurblocks = dq->dq_curblocks + change; 126 if (ncurblocks >= 0) 127 dq->dq_curblocks = ncurblocks; 128 else 129 dq->dq_curblocks = 0; 130 dq->dq_flags &= ~DQ_BLKS; 131 dq->dq_flags |= DQ_MOD; 132 } 133 return (0); 134 } 135 if ((flags & FORCE) == 0 && 136 (cred != NOCRED && cred->cr_uid != 0)) { 137 for (i = 0; i < MAXQUOTAS; i++) { 138 if ((dq = ip->i_dquot[i]) == NODQUOT) 139 continue; 140 if ((error = chkdqchg(ip, change, cred, i)) != 0) 141 return (error); 142 } 143 } 144 for (i = 0; i < MAXQUOTAS; i++) { 145 if ((dq = ip->i_dquot[i]) == NODQUOT) 146 continue; 147 while (dq->dq_flags & DQ_LOCK) { 148 dq->dq_flags |= DQ_WANT; 149 (void) tsleep(dq, PINOD+1, "chkdq", 0); 150 } 151 dq->dq_curblocks += change; 152 dq->dq_flags |= DQ_MOD; 153 } 154 return (0); 155 } 156 157 /* 158 * Check for a valid change to a users allocation. 159 * Issue an error message if appropriate. 160 */ 161 int 162 chkdqchg(ip, change, cred, type) 163 struct inode *ip; 164 int64_t change; 165 struct ucred *cred; 166 int type; 167 { 168 struct dquot *dq = ip->i_dquot[type]; 169 long ncurblocks = dq->dq_curblocks + change; 170 171 /* 172 * If user would exceed their hard limit, disallow space allocation. 173 */ 174 if (ncurblocks >= dq->dq_bhardlimit && dq->dq_bhardlimit) { 175 if ((dq->dq_flags & DQ_BLKS) == 0 && 176 ip->i_uid == cred->cr_uid) { 177 uprintf("\n%s: write failed, %s disk limit reached\n", 178 ITOV(ip)->v_mount->mnt_stat.f_mntonname, 179 quotatypes[type]); 180 dq->dq_flags |= DQ_BLKS; 181 } 182 return (EDQUOT); 183 } 184 /* 185 * If user is over their soft limit for too long, disallow space 186 * allocation. Reset time limit as they cross their soft limit. 187 */ 188 if (ncurblocks >= dq->dq_bsoftlimit && dq->dq_bsoftlimit) { 189 if (dq->dq_curblocks < dq->dq_bsoftlimit) { 190 dq->dq_btime = time.tv_sec + ip->i_ump->um_btime[type]; 191 if (ip->i_uid == cred->cr_uid) 192 uprintf("\n%s: warning, %s %s\n", 193 ITOV(ip)->v_mount->mnt_stat.f_mntonname, 194 quotatypes[type], "disk quota exceeded"); 195 return (0); 196 } 197 if (time.tv_sec > dq->dq_btime) { 198 if ((dq->dq_flags & DQ_BLKS) == 0 && 199 ip->i_uid == cred->cr_uid) { 200 uprintf("\n%s: write failed, %s %s\n", 201 ITOV(ip)->v_mount->mnt_stat.f_mntonname, 202 quotatypes[type], 203 "disk quota exceeded for too long"); 204 dq->dq_flags |= DQ_BLKS; 205 } 206 return (EDQUOT); 207 } 208 } 209 return (0); 210 } 211 212 /* 213 * Check the inode limit, applying corrective action. 214 */ 215 int 216 chkiq(ip, change, cred, flags) 217 struct inode *ip; 218 int32_t change; 219 struct ucred *cred; 220 int flags; 221 { 222 struct dquot *dq; 223 int i; 224 int ncurinodes, error; 225 226 #ifdef DIAGNOSTIC 227 if ((flags & CHOWN) == 0) 228 chkdquot(ip); 229 #endif 230 if (change == 0) 231 return (0); 232 if (change < 0) { 233 for (i = 0; i < MAXQUOTAS; i++) { 234 if ((dq = ip->i_dquot[i]) == NODQUOT) 235 continue; 236 while (dq->dq_flags & DQ_LOCK) { 237 dq->dq_flags |= DQ_WANT; 238 (void) tsleep(dq, PINOD+1, "chkiq", 0); 239 } 240 ncurinodes = dq->dq_curinodes + change; 241 if (ncurinodes >= 0) 242 dq->dq_curinodes = ncurinodes; 243 else 244 dq->dq_curinodes = 0; 245 dq->dq_flags &= ~DQ_INODS; 246 dq->dq_flags |= DQ_MOD; 247 } 248 return (0); 249 } 250 if ((flags & FORCE) == 0 && cred->cr_uid != 0) { 251 for (i = 0; i < MAXQUOTAS; i++) { 252 if ((dq = ip->i_dquot[i]) == NODQUOT) 253 continue; 254 if ((error = chkiqchg(ip, change, cred, i)) != 0) 255 return (error); 256 } 257 } 258 for (i = 0; i < MAXQUOTAS; i++) { 259 if ((dq = ip->i_dquot[i]) == NODQUOT) 260 continue; 261 while (dq->dq_flags & DQ_LOCK) { 262 dq->dq_flags |= DQ_WANT; 263 (void) tsleep(dq, PINOD+1, "chkiq", 0); 264 } 265 dq->dq_curinodes += change; 266 dq->dq_flags |= DQ_MOD; 267 } 268 return (0); 269 } 270 271 /* 272 * Check for a valid change to a users allocation. 273 * Issue an error message if appropriate. 274 */ 275 int 276 chkiqchg(ip, change, cred, type) 277 struct inode *ip; 278 int32_t change; 279 struct ucred *cred; 280 int type; 281 { 282 struct dquot *dq = ip->i_dquot[type]; 283 long ncurinodes = dq->dq_curinodes + change; 284 285 /* 286 * If user would exceed their hard limit, disallow inode allocation. 287 */ 288 if (ncurinodes >= dq->dq_ihardlimit && dq->dq_ihardlimit) { 289 if ((dq->dq_flags & DQ_INODS) == 0 && 290 ip->i_uid == cred->cr_uid) { 291 uprintf("\n%s: write failed, %s inode limit reached\n", 292 ITOV(ip)->v_mount->mnt_stat.f_mntonname, 293 quotatypes[type]); 294 dq->dq_flags |= DQ_INODS; 295 } 296 return (EDQUOT); 297 } 298 /* 299 * If user is over their soft limit for too long, disallow inode 300 * allocation. Reset time limit as they cross their soft limit. 301 */ 302 if (ncurinodes >= dq->dq_isoftlimit && dq->dq_isoftlimit) { 303 if (dq->dq_curinodes < dq->dq_isoftlimit) { 304 dq->dq_itime = time.tv_sec + ip->i_ump->um_itime[type]; 305 if (ip->i_uid == cred->cr_uid) 306 uprintf("\n%s: warning, %s %s\n", 307 ITOV(ip)->v_mount->mnt_stat.f_mntonname, 308 quotatypes[type], "inode quota exceeded"); 309 return (0); 310 } 311 if (time.tv_sec > dq->dq_itime) { 312 if ((dq->dq_flags & DQ_INODS) == 0 && 313 ip->i_uid == cred->cr_uid) { 314 uprintf("\n%s: write failed, %s %s\n", 315 ITOV(ip)->v_mount->mnt_stat.f_mntonname, 316 quotatypes[type], 317 "inode quota exceeded for too long"); 318 dq->dq_flags |= DQ_INODS; 319 } 320 return (EDQUOT); 321 } 322 } 323 return (0); 324 } 325 326 #ifdef DIAGNOSTIC 327 /* 328 * On filesystems with quotas enabled, it is an error for a file to change 329 * size and not to have a dquot structure associated with it. 330 */ 331 void 332 chkdquot(ip) 333 struct inode *ip; 334 { 335 struct ufsmount *ump = ip->i_ump; 336 int i; 337 338 for (i = 0; i < MAXQUOTAS; i++) { 339 if (ump->um_quotas[i] == NULLVP || 340 (ump->um_qflags[i] & (QTF_OPENING|QTF_CLOSING))) 341 continue; 342 if (ip->i_dquot[i] == NODQUOT) { 343 vprint("chkdquot: missing dquot", ITOV(ip)); 344 panic("missing dquot"); 345 } 346 } 347 } 348 #endif 349 350 /* 351 * Code to process quotactl commands. 352 */ 353 354 /* 355 * Q_QUOTAON - set up a quota file for a particular file system. 356 */ 357 int 358 quotaon(p, mp, type, fname) 359 struct proc *p; 360 struct mount *mp; 361 int type; 362 caddr_t fname; 363 { 364 struct ufsmount *ump = VFSTOUFS(mp); 365 struct vnode *vp, **vpp; 366 struct vnode *nextvp; 367 struct dquot *dq; 368 int error; 369 struct nameidata nd; 370 371 vpp = &ump->um_quotas[type]; 372 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, fname, p); 373 if ((error = vn_open(&nd, FREAD|FWRITE, 0)) != 0) 374 return (error); 375 vp = nd.ni_vp; 376 VOP_UNLOCK(vp, 0); 377 if (vp->v_type != VREG) { 378 (void) vn_close(vp, FREAD|FWRITE, p->p_ucred, p); 379 return (EACCES); 380 } 381 if (*vpp != vp) 382 quotaoff(p, mp, type); 383 ump->um_qflags[type] |= QTF_OPENING; 384 mp->mnt_flag |= MNT_QUOTA; 385 vp->v_flag |= VSYSTEM; 386 *vpp = vp; 387 /* 388 * Save the credential of the process that turned on quotas. 389 * Set up the time limits for this quota. 390 */ 391 crhold(p->p_ucred); 392 ump->um_cred[type] = p->p_ucred; 393 ump->um_btime[type] = MAX_DQ_TIME; 394 ump->um_itime[type] = MAX_IQ_TIME; 395 if (dqget(NULLVP, 0, ump, type, &dq) == 0) { 396 if (dq->dq_btime > 0) 397 ump->um_btime[type] = dq->dq_btime; 398 if (dq->dq_itime > 0) 399 ump->um_itime[type] = dq->dq_itime; 400 dqrele(NULLVP, dq); 401 } 402 /* 403 * Search vnodes associated with this mount point, 404 * adding references to quota file being opened. 405 * NB: only need to add dquot's for inodes being modified. 406 */ 407 again: 408 for (vp = LIST_FIRST(&mp->mnt_vnodelist); vp != NULL; vp = nextvp) { 409 nextvp = LIST_NEXT(vp, v_mntvnodes); 410 if (vp->v_type == VNON ||vp->v_writecount == 0) 411 continue; 412 if (vget(vp, LK_EXCLUSIVE)) 413 goto again; 414 if ((error = getinoquota(VTOI(vp))) != 0) { 415 vput(vp); 416 break; 417 } 418 vput(vp); 419 if (LIST_NEXT(vp, v_mntvnodes) != nextvp || vp->v_mount != mp) 420 goto again; 421 } 422 ump->um_qflags[type] &= ~QTF_OPENING; 423 if (error) 424 quotaoff(p, mp, type); 425 return (error); 426 } 427 428 /* 429 * Q_QUOTAOFF - turn off disk quotas for a filesystem. 430 */ 431 int 432 quotaoff(p, mp, type) 433 struct proc *p; 434 struct mount *mp; 435 int type; 436 { 437 struct vnode *vp; 438 struct vnode *qvp, *nextvp; 439 struct ufsmount *ump = VFSTOUFS(mp); 440 struct dquot *dq; 441 struct inode *ip; 442 int error; 443 444 if ((qvp = ump->um_quotas[type]) == NULLVP) 445 return (0); 446 ump->um_qflags[type] |= QTF_CLOSING; 447 /* 448 * Search vnodes associated with this mount point, 449 * deleting any references to quota file being closed. 450 */ 451 again: 452 for (vp = LIST_FIRST(&mp->mnt_vnodelist); vp != NULL; vp = nextvp) { 453 nextvp = LIST_NEXT(vp, v_mntvnodes); 454 if (vp->v_type == VNON) 455 continue; 456 if (vget(vp, LK_EXCLUSIVE)) 457 goto again; 458 ip = VTOI(vp); 459 dq = ip->i_dquot[type]; 460 ip->i_dquot[type] = NODQUOT; 461 dqrele(vp, dq); 462 vput(vp); 463 if (LIST_NEXT(vp, v_mntvnodes) != nextvp || vp->v_mount != mp) 464 goto again; 465 } 466 dqflush(qvp); 467 qvp->v_flag &= ~VSYSTEM; 468 error = vn_close(qvp, FREAD|FWRITE, p->p_ucred, p); 469 ump->um_quotas[type] = NULLVP; 470 crfree(ump->um_cred[type]); 471 ump->um_cred[type] = NOCRED; 472 ump->um_qflags[type] &= ~QTF_CLOSING; 473 for (type = 0; type < MAXQUOTAS; type++) 474 if (ump->um_quotas[type] != NULLVP) 475 break; 476 if (type == MAXQUOTAS) 477 mp->mnt_flag &= ~MNT_QUOTA; 478 return (error); 479 } 480 481 /* 482 * Q_GETQUOTA - return current values in a dqblk structure. 483 */ 484 int 485 getquota(mp, id, type, addr) 486 struct mount *mp; 487 u_long id; 488 int type; 489 caddr_t addr; 490 { 491 struct dquot *dq; 492 int error; 493 494 if ((error = dqget(NULLVP, id, VFSTOUFS(mp), type, &dq)) != 0) 495 return (error); 496 error = copyout((caddr_t)&dq->dq_dqb, addr, sizeof (struct dqblk)); 497 dqrele(NULLVP, dq); 498 return (error); 499 } 500 501 /* 502 * Q_SETQUOTA - assign an entire dqblk structure. 503 */ 504 int 505 setquota(mp, id, type, addr) 506 struct mount *mp; 507 u_long id; 508 int type; 509 caddr_t addr; 510 { 511 struct dquot *dq; 512 struct dquot *ndq; 513 struct ufsmount *ump = VFSTOUFS(mp); 514 struct dqblk newlim; 515 int error; 516 517 error = copyin(addr, (caddr_t)&newlim, sizeof (struct dqblk)); 518 if (error) 519 return (error); 520 if ((error = dqget(NULLVP, id, ump, type, &ndq)) != 0) 521 return (error); 522 dq = ndq; 523 while (dq->dq_flags & DQ_LOCK) { 524 dq->dq_flags |= DQ_WANT; 525 (void) tsleep(dq, PINOD+1, "setquota", 0); 526 } 527 /* 528 * Copy all but the current values. 529 * Reset time limit if previously had no soft limit or were 530 * under it, but now have a soft limit and are over it. 531 */ 532 newlim.dqb_curblocks = dq->dq_curblocks; 533 newlim.dqb_curinodes = dq->dq_curinodes; 534 if (dq->dq_id != 0) { 535 newlim.dqb_btime = dq->dq_btime; 536 newlim.dqb_itime = dq->dq_itime; 537 } 538 if (newlim.dqb_bsoftlimit && 539 dq->dq_curblocks >= newlim.dqb_bsoftlimit && 540 (dq->dq_bsoftlimit == 0 || dq->dq_curblocks < dq->dq_bsoftlimit)) 541 newlim.dqb_btime = time.tv_sec + ump->um_btime[type]; 542 if (newlim.dqb_isoftlimit && 543 dq->dq_curinodes >= newlim.dqb_isoftlimit && 544 (dq->dq_isoftlimit == 0 || dq->dq_curinodes < dq->dq_isoftlimit)) 545 newlim.dqb_itime = time.tv_sec + ump->um_itime[type]; 546 dq->dq_dqb = newlim; 547 if (dq->dq_curblocks < dq->dq_bsoftlimit) 548 dq->dq_flags &= ~DQ_BLKS; 549 if (dq->dq_curinodes < dq->dq_isoftlimit) 550 dq->dq_flags &= ~DQ_INODS; 551 if (dq->dq_isoftlimit == 0 && dq->dq_bsoftlimit == 0 && 552 dq->dq_ihardlimit == 0 && dq->dq_bhardlimit == 0) 553 dq->dq_flags |= DQ_FAKE; 554 else 555 dq->dq_flags &= ~DQ_FAKE; 556 dq->dq_flags |= DQ_MOD; 557 dqrele(NULLVP, dq); 558 return (0); 559 } 560 561 /* 562 * Q_SETUSE - set current inode and block usage. 563 */ 564 int 565 setuse(mp, id, type, addr) 566 struct mount *mp; 567 u_long id; 568 int type; 569 caddr_t addr; 570 { 571 struct dquot *dq; 572 struct ufsmount *ump = VFSTOUFS(mp); 573 struct dquot *ndq; 574 struct dqblk usage; 575 int error; 576 577 error = copyin(addr, (caddr_t)&usage, sizeof (struct dqblk)); 578 if (error) 579 return (error); 580 if ((error = dqget(NULLVP, id, ump, type, &ndq)) != 0) 581 return (error); 582 dq = ndq; 583 while (dq->dq_flags & DQ_LOCK) { 584 dq->dq_flags |= DQ_WANT; 585 (void) tsleep(dq, PINOD+1, "setuse", 0); 586 } 587 /* 588 * Reset time limit if have a soft limit and were 589 * previously under it, but are now over it. 590 */ 591 if (dq->dq_bsoftlimit && dq->dq_curblocks < dq->dq_bsoftlimit && 592 usage.dqb_curblocks >= dq->dq_bsoftlimit) 593 dq->dq_btime = time.tv_sec + ump->um_btime[type]; 594 if (dq->dq_isoftlimit && dq->dq_curinodes < dq->dq_isoftlimit && 595 usage.dqb_curinodes >= dq->dq_isoftlimit) 596 dq->dq_itime = time.tv_sec + ump->um_itime[type]; 597 dq->dq_curblocks = usage.dqb_curblocks; 598 dq->dq_curinodes = usage.dqb_curinodes; 599 if (dq->dq_curblocks < dq->dq_bsoftlimit) 600 dq->dq_flags &= ~DQ_BLKS; 601 if (dq->dq_curinodes < dq->dq_isoftlimit) 602 dq->dq_flags &= ~DQ_INODS; 603 dq->dq_flags |= DQ_MOD; 604 dqrele(NULLVP, dq); 605 return (0); 606 } 607 608 /* 609 * Q_SYNC - sync quota files to disk. 610 */ 611 int 612 qsync(mp) 613 struct mount *mp; 614 { 615 struct ufsmount *ump = VFSTOUFS(mp); 616 struct vnode *vp, *nextvp; 617 struct dquot *dq; 618 int i, error; 619 620 /* 621 * Check if the mount point has any quotas. 622 * If not, simply return. 623 */ 624 for (i = 0; i < MAXQUOTAS; i++) 625 if (ump->um_quotas[i] != NULLVP) 626 break; 627 if (i == MAXQUOTAS) 628 return (0); 629 /* 630 * Search vnodes associated with this mount point, 631 * synchronizing any modified dquot structures. 632 */ 633 simple_lock(&mntvnode_slock); 634 again: 635 for (vp = LIST_FIRST(&mp->mnt_vnodelist); vp != NULL; vp = nextvp) { 636 if (vp->v_mount != mp) 637 goto again; 638 nextvp = LIST_NEXT(vp, v_mntvnodes); 639 if (vp->v_type == VNON) 640 continue; 641 simple_lock(&vp->v_interlock); 642 simple_unlock(&mntvnode_slock); 643 error = vget(vp, LK_EXCLUSIVE | LK_NOWAIT | LK_INTERLOCK); 644 if (error) { 645 simple_lock(&mntvnode_slock); 646 if (error == ENOENT) 647 goto again; 648 continue; 649 } 650 for (i = 0; i < MAXQUOTAS; i++) { 651 dq = VTOI(vp)->i_dquot[i]; 652 if (dq != NODQUOT && (dq->dq_flags & DQ_MOD)) 653 dqsync(vp, dq); 654 } 655 vput(vp); 656 simple_lock(&mntvnode_slock); 657 if (LIST_NEXT(vp, v_mntvnodes) != nextvp) 658 goto again; 659 } 660 simple_unlock(&mntvnode_slock); 661 return (0); 662 } 663 664 /* 665 * Code pertaining to management of the in-core dquot data structures. 666 */ 667 #define DQHASH(dqvp, id) \ 668 (((((long)(dqvp)) >> 8) + id) & dqhash) 669 LIST_HEAD(dqhashhead, dquot) *dqhashtbl; 670 u_long dqhash; 671 672 /* 673 * Dquot free list. 674 */ 675 #define DQUOTINC 5 /* minimum free dquots desired */ 676 TAILQ_HEAD(dqfreelist, dquot) dqfreelist; 677 long numdquot, desireddquot = DQUOTINC; 678 679 MALLOC_DEFINE(M_DQUOT, "UFS quota", "UFS quota entries"); 680 681 /* 682 * Initialize the quota system. 683 */ 684 void 685 dqinit() 686 { 687 dqhashtbl = 688 hashinit(desiredvnodes, HASH_LIST, M_DQUOT, M_WAITOK, &dqhash); 689 TAILQ_INIT(&dqfreelist); 690 } 691 692 void 693 dqreinit() 694 { 695 struct dquot *dq; 696 struct dqhashhead *oldhash, *hash; 697 struct vnode *dqvp; 698 u_long oldmask, mask, hashval; 699 int i; 700 701 hash = hashinit(desiredvnodes, HASH_LIST, M_DQUOT, M_WAITOK, &mask); 702 oldhash = dqhashtbl; 703 oldmask = dqhash; 704 dqhashtbl = hash; 705 dqhash = mask; 706 for (i = 0; i <= oldmask; i++) { 707 while ((dq = LIST_FIRST(&oldhash[i])) != NULL) { 708 dqvp = dq->dq_ump->um_quotas[dq->dq_type]; 709 LIST_REMOVE(dq, dq_hash); 710 hashval = DQHASH(dqvp, dq->dq_id); 711 LIST_INSERT_HEAD(&dqhashtbl[hashval], dq, dq_hash); 712 } 713 } 714 hashdone(oldhash, M_DQUOT); 715 } 716 717 /* 718 * Free resources held by quota system. 719 */ 720 void 721 dqdone() 722 { 723 hashdone(dqhashtbl, M_DQUOT); 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 int 731 dqget(vp, id, ump, type, dqp) 732 struct vnode *vp; 733 u_long id; 734 struct ufsmount *ump; 735 int type; 736 struct dquot **dqp; 737 { 738 struct dquot *dq; 739 struct dqhashhead *dqh; 740 struct vnode *dqvp; 741 struct iovec aiov; 742 struct uio auio; 743 int error; 744 745 dqvp = ump->um_quotas[type]; 746 if (dqvp == NULLVP || (ump->um_qflags[type] & QTF_CLOSING)) { 747 *dqp = NODQUOT; 748 return (EINVAL); 749 } 750 /* 751 * Check the cache first. 752 */ 753 dqh = &dqhashtbl[DQHASH(dqvp, id)]; 754 LIST_FOREACH(dq, dqh, dq_hash) { 755 if (dq->dq_id != id || 756 dq->dq_ump->um_quotas[dq->dq_type] != dqvp) 757 continue; 758 /* 759 * Cache hit with no references. Take 760 * the structure off the free list. 761 */ 762 if (dq->dq_cnt == 0) 763 TAILQ_REMOVE(&dqfreelist, dq, dq_freelist); 764 DQREF(dq); 765 *dqp = dq; 766 return (0); 767 } 768 /* 769 * Not in cache, allocate a new one. 770 */ 771 if (dqfreelist.tqh_first == NODQUOT && 772 numdquot < MAXQUOTAS * desiredvnodes) 773 desireddquot += DQUOTINC; 774 if (numdquot < desireddquot) { 775 dq = (struct dquot *)malloc(sizeof *dq, M_DQUOT, M_WAITOK); 776 memset((char *)dq, 0, sizeof *dq); 777 numdquot++; 778 } else { 779 if ((dq = dqfreelist.tqh_first) == NULL) { 780 tablefull("dquot", 781 "increase kern.maxvnodes or NVNODE"); 782 *dqp = NODQUOT; 783 return (EUSERS); 784 } 785 if (dq->dq_cnt || (dq->dq_flags & DQ_MOD)) 786 panic("free dquot isn't"); 787 TAILQ_REMOVE(&dqfreelist, dq, dq_freelist); 788 LIST_REMOVE(dq, dq_hash); 789 } 790 /* 791 * Initialize the contents of the dquot structure. 792 */ 793 if (vp != dqvp) 794 vn_lock(dqvp, LK_EXCLUSIVE | LK_RETRY); 795 LIST_INSERT_HEAD(dqh, dq, dq_hash); 796 DQREF(dq); 797 dq->dq_flags = DQ_LOCK; 798 dq->dq_id = id; 799 dq->dq_ump = ump; 800 dq->dq_type = type; 801 auio.uio_iov = &aiov; 802 auio.uio_iovcnt = 1; 803 aiov.iov_base = (caddr_t)&dq->dq_dqb; 804 aiov.iov_len = sizeof (struct dqblk); 805 auio.uio_resid = sizeof (struct dqblk); 806 auio.uio_offset = (off_t)(id * sizeof (struct dqblk)); 807 auio.uio_segflg = UIO_SYSSPACE; 808 auio.uio_rw = UIO_READ; 809 auio.uio_procp = (struct proc *)0; 810 error = VOP_READ(dqvp, &auio, 0, ump->um_cred[type]); 811 if (auio.uio_resid == sizeof(struct dqblk) && error == 0) 812 memset((caddr_t)&dq->dq_dqb, 0, sizeof(struct dqblk)); 813 if (vp != dqvp) 814 VOP_UNLOCK(dqvp, 0); 815 if (dq->dq_flags & DQ_WANT) 816 wakeup((caddr_t)dq); 817 dq->dq_flags = 0; 818 /* 819 * I/O error in reading quota file, release 820 * quota structure and reflect problem to caller. 821 */ 822 if (error) { 823 LIST_REMOVE(dq, dq_hash); 824 dqrele(vp, dq); 825 *dqp = NODQUOT; 826 return (error); 827 } 828 /* 829 * Check for no limit to enforce. 830 * Initialize time values if necessary. 831 */ 832 if (dq->dq_isoftlimit == 0 && dq->dq_bsoftlimit == 0 && 833 dq->dq_ihardlimit == 0 && dq->dq_bhardlimit == 0) 834 dq->dq_flags |= DQ_FAKE; 835 if (dq->dq_id != 0) { 836 if (dq->dq_btime == 0) 837 dq->dq_btime = time.tv_sec + ump->um_btime[type]; 838 if (dq->dq_itime == 0) 839 dq->dq_itime = time.tv_sec + ump->um_itime[type]; 840 } 841 *dqp = dq; 842 return (0); 843 } 844 845 /* 846 * Obtain a reference to a dquot. 847 */ 848 void 849 dqref(dq) 850 struct dquot *dq; 851 { 852 853 dq->dq_cnt++; 854 } 855 856 /* 857 * Release a reference to a dquot. 858 */ 859 void 860 dqrele(vp, dq) 861 struct vnode *vp; 862 struct dquot *dq; 863 { 864 865 if (dq == NODQUOT) 866 return; 867 if (dq->dq_cnt > 1) { 868 dq->dq_cnt--; 869 return; 870 } 871 if (dq->dq_flags & DQ_MOD) 872 (void) dqsync(vp, dq); 873 if (--dq->dq_cnt > 0) 874 return; 875 TAILQ_INSERT_TAIL(&dqfreelist, dq, dq_freelist); 876 } 877 878 /* 879 * Update the disk quota in the quota file. 880 */ 881 int 882 dqsync(vp, dq) 883 struct vnode *vp; 884 struct dquot *dq; 885 { 886 struct vnode *dqvp; 887 struct mount *mp; 888 struct iovec aiov; 889 struct uio auio; 890 int error; 891 892 if (dq == NODQUOT) 893 panic("dqsync: dquot"); 894 if ((dq->dq_flags & DQ_MOD) == 0) 895 return (0); 896 if ((dqvp = dq->dq_ump->um_quotas[dq->dq_type]) == NULLVP) 897 panic("dqsync: file"); 898 vn_start_write(dqvp, &mp, V_WAIT | V_LOWER); 899 if (vp != dqvp) 900 vn_lock(dqvp, LK_EXCLUSIVE | LK_RETRY); 901 while (dq->dq_flags & DQ_LOCK) { 902 dq->dq_flags |= DQ_WANT; 903 (void) tsleep(dq, PINOD+2, "dqsync", 0); 904 if ((dq->dq_flags & DQ_MOD) == 0) { 905 if (vp != dqvp) 906 VOP_UNLOCK(dqvp, 0); 907 vn_finished_write(mp, V_LOWER); 908 return (0); 909 } 910 } 911 dq->dq_flags |= DQ_LOCK; 912 auio.uio_iov = &aiov; 913 auio.uio_iovcnt = 1; 914 aiov.iov_base = (caddr_t)&dq->dq_dqb; 915 aiov.iov_len = sizeof (struct dqblk); 916 auio.uio_resid = sizeof (struct dqblk); 917 auio.uio_offset = (off_t)(dq->dq_id * sizeof (struct dqblk)); 918 auio.uio_segflg = UIO_SYSSPACE; 919 auio.uio_rw = UIO_WRITE; 920 auio.uio_procp = (struct proc *)0; 921 error = VOP_WRITE(dqvp, &auio, 0, dq->dq_ump->um_cred[dq->dq_type]); 922 if (auio.uio_resid && error == 0) 923 error = EIO; 924 if (dq->dq_flags & DQ_WANT) 925 wakeup((caddr_t)dq); 926 dq->dq_flags &= ~(DQ_MOD|DQ_LOCK|DQ_WANT); 927 if (vp != dqvp) 928 VOP_UNLOCK(dqvp, 0); 929 vn_finished_write(mp, V_LOWER); 930 return (error); 931 } 932 933 /* 934 * Flush all entries from the cache for a particular vnode. 935 */ 936 void 937 dqflush(vp) 938 struct vnode *vp; 939 { 940 struct dquot *dq, *nextdq; 941 struct dqhashhead *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 = LIST_FIRST(dqh); dq; dq = nextdq) { 950 nextdq = LIST_NEXT(dq, dq_hash); 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 = NULL; 957 } 958 } 959 } 960
Indexes created Wed Oct 15 16:09:53 GMT 2025