ufs_quota.c revision 1.26
1 /* $NetBSD: ufs_quota.c,v 1.26 2003/06/29 18:43:48 thorpej 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. All advertising materials mentioning features or use of this software 19 * must display the following acknowledgement: 20 * This product includes software developed by the University of 21 * California, Berkeley and its contributors. 22 * 4. Neither the name of the University nor the names of its contributors 23 * may be used to endorse or promote products derived from this software 24 * without specific prior written permission. 25 * 26 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 27 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 28 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 29 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 30 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 31 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 32 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 33 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 34 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 35 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 36 * SUCH DAMAGE. 37 * 38 * @(#)ufs_quota.c 8.5 (Berkeley) 5/20/95 39 */ 40 41 #include <sys/cdefs.h> 42 __KERNEL_RCSID(0, "$NetBSD: ufs_quota.c,v 1.26 2003/06/29 18:43:48 thorpej Exp $"); 43 44 #include <sys/param.h> 45 #include <sys/kernel.h> 46 #include <sys/systm.h> 47 #include <sys/namei.h> 48 #include <sys/malloc.h> 49 #include <sys/file.h> 50 #include <sys/proc.h> 51 #include <sys/vnode.h> 52 #include <sys/mount.h> 53 54 #include <ufs/ufs/quota.h> 55 #include <ufs/ufs/inode.h> 56 #include <ufs/ufs/ufsmount.h> 57 #include <ufs/ufs/ufs_extern.h> 58 59 /* 60 * Quota name to error message mapping. 61 */ 62 static char *quotatypes[] = INITQFNAMES; 63 64 /* 65 * Set up the quotas for an inode. 66 * 67 * This routine completely defines the semantics of quotas. 68 * If other criterion want to be used to establish quotas, the 69 * MAXQUOTAS value in quotas.h should be increased, and the 70 * additional dquots set up here. 71 */ 72 int 73 getinoquota(ip) 74 struct inode *ip; 75 { 76 struct ufsmount *ump; 77 struct vnode *vp = ITOV(ip); 78 int error; 79 80 ump = VFSTOUFS(vp->v_mount); 81 /* 82 * Set up the user quota based on file uid. 83 * EINVAL means that quotas are not enabled. 84 */ 85 if (ip->i_dquot[USRQUOTA] == NODQUOT && 86 (error = 87 dqget(vp, ip->i_uid, ump, USRQUOTA, &ip->i_dquot[USRQUOTA])) && 88 error != EINVAL) 89 return (error); 90 /* 91 * Set up the group quota based on file gid. 92 * EINVAL means that quotas are not enabled. 93 */ 94 if (ip->i_dquot[GRPQUOTA] == NODQUOT && 95 (error = 96 dqget(vp, ip->i_gid, ump, GRPQUOTA, &ip->i_dquot[GRPQUOTA])) && 97 error != EINVAL) 98 return (error); 99 return (0); 100 } 101 102 /* 103 * Update disk usage, and take corrective action. 104 */ 105 int 106 chkdq(ip, change, cred, flags) 107 struct inode *ip; 108 int64_t change; 109 struct ucred *cred; 110 int flags; 111 { 112 struct dquot *dq; 113 int i; 114 int ncurblocks, error; 115 116 #ifdef DIAGNOSTIC 117 if ((flags & CHOWN) == 0) 118 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 while (dq->dq_flags & DQ_LOCK) { 127 dq->dq_flags |= DQ_WANT; 128 (void) tsleep(dq, PINOD+1, "chkdq", 0); 129 } 130 ncurblocks = dq->dq_curblocks + change; 131 if (ncurblocks >= 0) 132 dq->dq_curblocks = ncurblocks; 133 else 134 dq->dq_curblocks = 0; 135 dq->dq_flags &= ~DQ_BLKS; 136 dq->dq_flags |= DQ_MOD; 137 } 138 return (0); 139 } 140 if ((flags & FORCE) == 0 && 141 (cred != NOCRED && cred->cr_uid != 0)) { 142 for (i = 0; i < MAXQUOTAS; i++) { 143 if ((dq = ip->i_dquot[i]) == NODQUOT) 144 continue; 145 if ((error = chkdqchg(ip, change, cred, i)) != 0) 146 return (error); 147 } 148 } 149 for (i = 0; i < MAXQUOTAS; i++) { 150 if ((dq = ip->i_dquot[i]) == NODQUOT) 151 continue; 152 while (dq->dq_flags & DQ_LOCK) { 153 dq->dq_flags |= DQ_WANT; 154 (void) tsleep(dq, PINOD+1, "chkdq", 0); 155 } 156 dq->dq_curblocks += change; 157 dq->dq_flags |= DQ_MOD; 158 } 159 return (0); 160 } 161 162 /* 163 * Check for a valid change to a users allocation. 164 * Issue an error message if appropriate. 165 */ 166 int 167 chkdqchg(ip, change, cred, type) 168 struct inode *ip; 169 int64_t change; 170 struct ucred *cred; 171 int type; 172 { 173 struct dquot *dq = ip->i_dquot[type]; 174 long ncurblocks = dq->dq_curblocks + change; 175 176 /* 177 * If user would exceed their hard limit, disallow space allocation. 178 */ 179 if (ncurblocks >= dq->dq_bhardlimit && dq->dq_bhardlimit) { 180 if ((dq->dq_flags & DQ_BLKS) == 0 && 181 ip->i_uid == cred->cr_uid) { 182 uprintf("\n%s: write failed, %s disk limit reached\n", 183 ITOV(ip)->v_mount->mnt_stat.f_mntonname, 184 quotatypes[type]); 185 dq->dq_flags |= DQ_BLKS; 186 } 187 return (EDQUOT); 188 } 189 /* 190 * If user is over their soft limit for too long, disallow space 191 * allocation. Reset time limit as they cross their soft limit. 192 */ 193 if (ncurblocks >= dq->dq_bsoftlimit && dq->dq_bsoftlimit) { 194 if (dq->dq_curblocks < dq->dq_bsoftlimit) { 195 dq->dq_btime = time.tv_sec + 196 VFSTOUFS(ITOV(ip)->v_mount)->um_btime[type]; 197 if (ip->i_uid == cred->cr_uid) 198 uprintf("\n%s: warning, %s %s\n", 199 ITOV(ip)->v_mount->mnt_stat.f_mntonname, 200 quotatypes[type], "disk quota exceeded"); 201 return (0); 202 } 203 if (time.tv_sec > dq->dq_btime) { 204 if ((dq->dq_flags & DQ_BLKS) == 0 && 205 ip->i_uid == cred->cr_uid) { 206 uprintf("\n%s: write failed, %s %s\n", 207 ITOV(ip)->v_mount->mnt_stat.f_mntonname, 208 quotatypes[type], 209 "disk quota exceeded for too long"); 210 dq->dq_flags |= DQ_BLKS; 211 } 212 return (EDQUOT); 213 } 214 } 215 return (0); 216 } 217 218 /* 219 * Check the inode limit, applying corrective action. 220 */ 221 int 222 chkiq(ip, change, cred, flags) 223 struct inode *ip; 224 int32_t change; 225 struct ucred *cred; 226 int flags; 227 { 228 struct dquot *dq; 229 int i; 230 int ncurinodes, error; 231 232 #ifdef DIAGNOSTIC 233 if ((flags & CHOWN) == 0) 234 chkdquot(ip); 235 #endif 236 if (change == 0) 237 return (0); 238 if (change < 0) { 239 for (i = 0; i < MAXQUOTAS; i++) { 240 if ((dq = ip->i_dquot[i]) == NODQUOT) 241 continue; 242 while (dq->dq_flags & DQ_LOCK) { 243 dq->dq_flags |= DQ_WANT; 244 (void) tsleep(dq, PINOD+1, "chkiq", 0); 245 } 246 ncurinodes = dq->dq_curinodes + change; 247 if (ncurinodes >= 0) 248 dq->dq_curinodes = ncurinodes; 249 else 250 dq->dq_curinodes = 0; 251 dq->dq_flags &= ~DQ_INODS; 252 dq->dq_flags |= DQ_MOD; 253 } 254 return (0); 255 } 256 if ((flags & FORCE) == 0 && cred->cr_uid != 0) { 257 for (i = 0; i < MAXQUOTAS; i++) { 258 if ((dq = ip->i_dquot[i]) == NODQUOT) 259 continue; 260 if ((error = chkiqchg(ip, change, cred, i)) != 0) 261 return (error); 262 } 263 } 264 for (i = 0; i < MAXQUOTAS; i++) { 265 if ((dq = ip->i_dquot[i]) == NODQUOT) 266 continue; 267 while (dq->dq_flags & DQ_LOCK) { 268 dq->dq_flags |= DQ_WANT; 269 (void) tsleep(dq, PINOD+1, "chkiq", 0); 270 } 271 dq->dq_curinodes += change; 272 dq->dq_flags |= DQ_MOD; 273 } 274 return (0); 275 } 276 277 /* 278 * Check for a valid change to a users allocation. 279 * Issue an error message if appropriate. 280 */ 281 int 282 chkiqchg(ip, change, cred, type) 283 struct inode *ip; 284 int32_t change; 285 struct ucred *cred; 286 int type; 287 { 288 struct dquot *dq = ip->i_dquot[type]; 289 long ncurinodes = dq->dq_curinodes + change; 290 291 /* 292 * If user would exceed their hard limit, disallow inode allocation. 293 */ 294 if (ncurinodes >= dq->dq_ihardlimit && dq->dq_ihardlimit) { 295 if ((dq->dq_flags & DQ_INODS) == 0 && 296 ip->i_uid == cred->cr_uid) { 297 uprintf("\n%s: write failed, %s inode limit reached\n", 298 ITOV(ip)->v_mount->mnt_stat.f_mntonname, 299 quotatypes[type]); 300 dq->dq_flags |= DQ_INODS; 301 } 302 return (EDQUOT); 303 } 304 /* 305 * If user is over their soft limit for too long, disallow inode 306 * allocation. Reset time limit as they cross their soft limit. 307 */ 308 if (ncurinodes >= dq->dq_isoftlimit && dq->dq_isoftlimit) { 309 if (dq->dq_curinodes < dq->dq_isoftlimit) { 310 dq->dq_itime = time.tv_sec + 311 VFSTOUFS(ITOV(ip)->v_mount)->um_itime[type]; 312 if (ip->i_uid == cred->cr_uid) 313 uprintf("\n%s: warning, %s %s\n", 314 ITOV(ip)->v_mount->mnt_stat.f_mntonname, 315 quotatypes[type], "inode quota exceeded"); 316 return (0); 317 } 318 if (time.tv_sec > dq->dq_itime) { 319 if ((dq->dq_flags & DQ_INODS) == 0 && 320 ip->i_uid == cred->cr_uid) { 321 uprintf("\n%s: write failed, %s %s\n", 322 ITOV(ip)->v_mount->mnt_stat.f_mntonname, 323 quotatypes[type], 324 "inode quota exceeded for too long"); 325 dq->dq_flags |= DQ_INODS; 326 } 327 return (EDQUOT); 328 } 329 } 330 return (0); 331 } 332 333 #ifdef DIAGNOSTIC 334 /* 335 * On filesystems with quotas enabled, it is an error for a file to change 336 * size and not to have a dquot structure associated with it. 337 */ 338 void 339 chkdquot(ip) 340 struct inode *ip; 341 { 342 struct ufsmount *ump = VFSTOUFS(ITOV(ip)->v_mount); 343 int i; 344 345 for (i = 0; i < MAXQUOTAS; i++) { 346 if (ump->um_quotas[i] == NULLVP || 347 (ump->um_qflags[i] & (QTF_OPENING|QTF_CLOSING))) 348 continue; 349 if (ip->i_dquot[i] == NODQUOT) { 350 vprint("chkdquot: missing dquot", ITOV(ip)); 351 panic("missing dquot"); 352 } 353 } 354 } 355 #endif 356 357 /* 358 * Code to process quotactl commands. 359 */ 360 361 /* 362 * Q_QUOTAON - set up a quota file for a particular file system. 363 */ 364 int 365 quotaon(l, mp, type, fname) 366 struct lwp *l; 367 struct mount *mp; 368 int type; 369 caddr_t fname; 370 { 371 struct ufsmount *ump = VFSTOUFS(mp); 372 struct vnode *vp, **vpp; 373 struct vnode *nextvp; 374 struct dquot *dq; 375 struct proc *p; 376 int error; 377 struct nameidata nd; 378 379 p = l->l_proc; 380 vpp = &ump->um_quotas[type]; 381 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, fname, l); 382 if ((error = vn_open(&nd, FREAD|FWRITE, 0)) != 0) 383 return (error); 384 vp = nd.ni_vp; 385 VOP_UNLOCK(vp, 0); 386 if (vp->v_type != VREG) { 387 (void) vn_close(vp, FREAD|FWRITE, p->p_ucred, l); 388 return (EACCES); 389 } 390 if (*vpp != vp) 391 quotaoff(l, mp, type); 392 ump->um_qflags[type] |= QTF_OPENING; 393 mp->mnt_flag |= MNT_QUOTA; 394 vp->v_flag |= VSYSTEM; 395 *vpp = vp; 396 /* 397 * Save the credential of the process that turned on quotas. 398 * Set up the time limits for this quota. 399 */ 400 crhold(p->p_ucred); 401 ump->um_cred[type] = p->p_ucred; 402 ump->um_btime[type] = MAX_DQ_TIME; 403 ump->um_itime[type] = MAX_IQ_TIME; 404 if (dqget(NULLVP, 0, ump, type, &dq) == 0) { 405 if (dq->dq_btime > 0) 406 ump->um_btime[type] = dq->dq_btime; 407 if (dq->dq_itime > 0) 408 ump->um_itime[type] = dq->dq_itime; 409 dqrele(NULLVP, dq); 410 } 411 /* 412 * Search vnodes associated with this mount point, 413 * adding references to quota file being opened. 414 * NB: only need to add dquot's for inodes being modified. 415 */ 416 again: 417 for (vp = LIST_FIRST(&mp->mnt_vnodelist); vp != NULL; vp = nextvp) { 418 nextvp = LIST_NEXT(vp, v_mntvnodes); 419 if (vp->v_type == VNON ||vp->v_writecount == 0) 420 continue; 421 if (vget(vp, LK_EXCLUSIVE)) 422 goto again; 423 if ((error = getinoquota(VTOI(vp))) != 0) { 424 vput(vp); 425 break; 426 } 427 vput(vp); 428 if (LIST_NEXT(vp, v_mntvnodes) != nextvp || vp->v_mount != mp) 429 goto again; 430 } 431 ump->um_qflags[type] &= ~QTF_OPENING; 432 if (error) 433 quotaoff(l, mp, type); 434 return (error); 435 } 436 437 /* 438 * Q_QUOTAOFF - turn off disk quotas for a filesystem. 439 */ 440 int 441 quotaoff(l, mp, type) 442 struct lwp *l; 443 struct mount *mp; 444 int type; 445 { 446 struct vnode *vp; 447 struct vnode *qvp, *nextvp; 448 struct ufsmount *ump = VFSTOUFS(mp); 449 struct dquot *dq; 450 struct inode *ip; 451 int error; 452 453 if ((qvp = ump->um_quotas[type]) == NULLVP) 454 return (0); 455 ump->um_qflags[type] |= QTF_CLOSING; 456 /* 457 * Search vnodes associated with this mount point, 458 * deleting any references to quota file being closed. 459 */ 460 again: 461 for (vp = LIST_FIRST(&mp->mnt_vnodelist); vp != NULL; vp = nextvp) { 462 nextvp = LIST_NEXT(vp, v_mntvnodes); 463 if (vp->v_type == VNON) 464 continue; 465 if (vget(vp, LK_EXCLUSIVE)) 466 goto again; 467 ip = VTOI(vp); 468 dq = ip->i_dquot[type]; 469 ip->i_dquot[type] = NODQUOT; 470 dqrele(vp, dq); 471 vput(vp); 472 if (LIST_NEXT(vp, v_mntvnodes) != nextvp || vp->v_mount != mp) 473 goto again; 474 } 475 dqflush(qvp); 476 qvp->v_flag &= ~VSYSTEM; 477 error = vn_close(qvp, FREAD|FWRITE, l->l_proc->p_ucred, l); 478 ump->um_quotas[type] = NULLVP; 479 crfree(ump->um_cred[type]); 480 ump->um_cred[type] = NOCRED; 481 ump->um_qflags[type] &= ~QTF_CLOSING; 482 for (type = 0; type < MAXQUOTAS; type++) 483 if (ump->um_quotas[type] != NULLVP) 484 break; 485 if (type == MAXQUOTAS) 486 mp->mnt_flag &= ~MNT_QUOTA; 487 return (error); 488 } 489 490 /* 491 * Q_GETQUOTA - return current values in a dqblk structure. 492 */ 493 int 494 getquota(mp, id, type, addr) 495 struct mount *mp; 496 u_long id; 497 int type; 498 caddr_t addr; 499 { 500 struct dquot *dq; 501 int error; 502 503 if ((error = dqget(NULLVP, id, VFSTOUFS(mp), type, &dq)) != 0) 504 return (error); 505 error = copyout((caddr_t)&dq->dq_dqb, addr, sizeof (struct dqblk)); 506 dqrele(NULLVP, dq); 507 return (error); 508 } 509 510 /* 511 * Q_SETQUOTA - assign an entire dqblk structure. 512 */ 513 int 514 setquota(mp, id, type, addr) 515 struct mount *mp; 516 u_long id; 517 int type; 518 caddr_t addr; 519 { 520 struct dquot *dq; 521 struct dquot *ndq; 522 struct ufsmount *ump = VFSTOUFS(mp); 523 struct dqblk newlim; 524 int error; 525 526 error = copyin(addr, (caddr_t)&newlim, sizeof (struct dqblk)); 527 if (error) 528 return (error); 529 if ((error = dqget(NULLVP, id, ump, type, &ndq)) != 0) 530 return (error); 531 dq = ndq; 532 while (dq->dq_flags & DQ_LOCK) { 533 dq->dq_flags |= DQ_WANT; 534 (void) tsleep(dq, PINOD+1, "setquota", 0); 535 } 536 /* 537 * Copy all but the current values. 538 * Reset time limit if previously had no soft limit or were 539 * under it, but now have a soft limit and are over it. 540 */ 541 newlim.dqb_curblocks = dq->dq_curblocks; 542 newlim.dqb_curinodes = dq->dq_curinodes; 543 if (dq->dq_id != 0) { 544 newlim.dqb_btime = dq->dq_btime; 545 newlim.dqb_itime = dq->dq_itime; 546 } 547 if (newlim.dqb_bsoftlimit && 548 dq->dq_curblocks >= newlim.dqb_bsoftlimit && 549 (dq->dq_bsoftlimit == 0 || dq->dq_curblocks < dq->dq_bsoftlimit)) 550 newlim.dqb_btime = time.tv_sec + ump->um_btime[type]; 551 if (newlim.dqb_isoftlimit && 552 dq->dq_curinodes >= newlim.dqb_isoftlimit && 553 (dq->dq_isoftlimit == 0 || dq->dq_curinodes < dq->dq_isoftlimit)) 554 newlim.dqb_itime = time.tv_sec + ump->um_itime[type]; 555 dq->dq_dqb = newlim; 556 if (dq->dq_curblocks < dq->dq_bsoftlimit) 557 dq->dq_flags &= ~DQ_BLKS; 558 if (dq->dq_curinodes < dq->dq_isoftlimit) 559 dq->dq_flags &= ~DQ_INODS; 560 if (dq->dq_isoftlimit == 0 && dq->dq_bsoftlimit == 0 && 561 dq->dq_ihardlimit == 0 && dq->dq_bhardlimit == 0) 562 dq->dq_flags |= DQ_FAKE; 563 else 564 dq->dq_flags &= ~DQ_FAKE; 565 dq->dq_flags |= DQ_MOD; 566 dqrele(NULLVP, dq); 567 return (0); 568 } 569 570 /* 571 * Q_SETUSE - set current inode and block usage. 572 */ 573 int 574 setuse(mp, id, type, addr) 575 struct mount *mp; 576 u_long id; 577 int type; 578 caddr_t addr; 579 { 580 struct dquot *dq; 581 struct ufsmount *ump = VFSTOUFS(mp); 582 struct dquot *ndq; 583 struct dqblk usage; 584 int error; 585 586 error = copyin(addr, (caddr_t)&usage, sizeof (struct dqblk)); 587 if (error) 588 return (error); 589 if ((error = dqget(NULLVP, id, ump, type, &ndq)) != 0) 590 return (error); 591 dq = ndq; 592 while (dq->dq_flags & DQ_LOCK) { 593 dq->dq_flags |= DQ_WANT; 594 (void) tsleep(dq, PINOD+1, "setuse", 0); 595 } 596 /* 597 * Reset time limit if have a soft limit and were 598 * previously under it, but are now over it. 599 */ 600 if (dq->dq_bsoftlimit && dq->dq_curblocks < dq->dq_bsoftlimit && 601 usage.dqb_curblocks >= dq->dq_bsoftlimit) 602 dq->dq_btime = time.tv_sec + ump->um_btime[type]; 603 if (dq->dq_isoftlimit && dq->dq_curinodes < dq->dq_isoftlimit && 604 usage.dqb_curinodes >= dq->dq_isoftlimit) 605 dq->dq_itime = time.tv_sec + ump->um_itime[type]; 606 dq->dq_curblocks = usage.dqb_curblocks; 607 dq->dq_curinodes = usage.dqb_curinodes; 608 if (dq->dq_curblocks < dq->dq_bsoftlimit) 609 dq->dq_flags &= ~DQ_BLKS; 610 if (dq->dq_curinodes < dq->dq_isoftlimit) 611 dq->dq_flags &= ~DQ_INODS; 612 dq->dq_flags |= DQ_MOD; 613 dqrele(NULLVP, dq); 614 return (0); 615 } 616 617 /* 618 * Q_SYNC - sync quota files to disk. 619 */ 620 int 621 qsync(l, mp) 622 struct lwp *l; 623 struct mount *mp; 624 { 625 struct ufsmount *ump = VFSTOUFS(mp); 626 struct vnode *vp, *nextvp; 627 struct dquot *dq; 628 int i, error; 629 630 /* 631 * Check if the mount point has any quotas. 632 * If not, simply return. 633 */ 634 for (i = 0; i < MAXQUOTAS; i++) 635 if (ump->um_quotas[i] != NULLVP) 636 break; 637 if (i == MAXQUOTAS) 638 return (0); 639 /* 640 * Search vnodes associated with this mount point, 641 * synchronizing any modified dquot structures. 642 */ 643 simple_lock(&mntvnode_slock); 644 again: 645 for (vp = LIST_FIRST(&mp->mnt_vnodelist); vp != NULL; vp = nextvp) { 646 if (vp->v_mount != mp) 647 goto again; 648 nextvp = LIST_NEXT(vp, v_mntvnodes); 649 if (vp->v_type == VNON) 650 continue; 651 simple_lock(&vp->v_interlock); 652 simple_unlock(&mntvnode_slock); 653 error = vget(vp, LK_EXCLUSIVE | LK_NOWAIT | LK_INTERLOCK); 654 if (error) { 655 simple_lock(&mntvnode_slock); 656 if (error == ENOENT) 657 goto again; 658 continue; 659 } 660 for (i = 0; i < MAXQUOTAS; i++) { 661 dq = VTOI(vp)->i_dquot[i]; 662 if (dq != NODQUOT && (dq->dq_flags & DQ_MOD)) 663 dqsync(vp, dq); 664 } 665 vput(vp); 666 simple_lock(&mntvnode_slock); 667 if (LIST_NEXT(vp, v_mntvnodes) != nextvp) 668 goto again; 669 } 670 simple_unlock(&mntvnode_slock); 671 return (0); 672 } 673 674 /* 675 * Code pertaining to management of the in-core dquot data structures. 676 */ 677 #define DQHASH(dqvp, id) \ 678 (((((long)(dqvp)) >> 8) + id) & dqhash) 679 LIST_HEAD(dqhashhead, dquot) *dqhashtbl; 680 u_long dqhash; 681 682 /* 683 * Dquot free list. 684 */ 685 #define DQUOTINC 5 /* minimum free dquots desired */ 686 TAILQ_HEAD(dqfreelist, dquot) dqfreelist; 687 long numdquot, desireddquot = DQUOTINC; 688 689 MALLOC_DEFINE(M_DQUOT, "UFS quota", "UFS quota entries"); 690 691 /* 692 * Initialize the quota system. 693 */ 694 void 695 dqinit() 696 { 697 dqhashtbl = 698 hashinit(desiredvnodes, HASH_LIST, M_DQUOT, M_WAITOK, &dqhash); 699 TAILQ_INIT(&dqfreelist); 700 } 701 702 void 703 dqreinit() 704 { 705 struct dquot *dq; 706 struct dqhashhead *oldhash, *hash; 707 struct vnode *dqvp; 708 u_long oldmask, mask, hashval; 709 int i; 710 711 hash = hashinit(desiredvnodes, HASH_LIST, M_DQUOT, M_WAITOK, &mask); 712 oldhash = dqhashtbl; 713 oldmask = dqhash; 714 dqhashtbl = hash; 715 dqhash = mask; 716 for (i = 0; i <= oldmask; i++) { 717 while ((dq = LIST_FIRST(&oldhash[i])) != NULL) { 718 dqvp = dq->dq_ump->um_quotas[dq->dq_type]; 719 LIST_REMOVE(dq, dq_hash); 720 hashval = DQHASH(dqvp, dq->dq_id); 721 LIST_INSERT_HEAD(&dqhashtbl[hashval], dq, dq_hash); 722 } 723 } 724 hashdone(oldhash, M_DQUOT); 725 } 726 727 /* 728 * Free resources held by quota system. 729 */ 730 void 731 dqdone() 732 { 733 hashdone(dqhashtbl, M_DQUOT); 734 } 735 736 /* 737 * Obtain a dquot structure for the specified identifier and quota file 738 * reading the information from the file if necessary. 739 */ 740 int 741 dqget(vp, id, ump, type, dqp) 742 struct vnode *vp; 743 u_long id; 744 struct ufsmount *ump; 745 int type; 746 struct dquot **dqp; 747 { 748 struct dquot *dq; 749 struct dqhashhead *dqh; 750 struct vnode *dqvp; 751 struct iovec aiov; 752 struct uio auio; 753 int error; 754 755 dqvp = ump->um_quotas[type]; 756 if (dqvp == NULLVP || (ump->um_qflags[type] & QTF_CLOSING)) { 757 *dqp = NODQUOT; 758 return (EINVAL); 759 } 760 /* 761 * Check the cache first. 762 */ 763 dqh = &dqhashtbl[DQHASH(dqvp, id)]; 764 LIST_FOREACH(dq, dqh, dq_hash) { 765 if (dq->dq_id != id || 766 dq->dq_ump->um_quotas[dq->dq_type] != dqvp) 767 continue; 768 /* 769 * Cache hit with no references. Take 770 * the structure off the free list. 771 */ 772 if (dq->dq_cnt == 0) 773 TAILQ_REMOVE(&dqfreelist, dq, dq_freelist); 774 DQREF(dq); 775 *dqp = dq; 776 return (0); 777 } 778 /* 779 * Not in cache, allocate a new one. 780 */ 781 if (dqfreelist.tqh_first == NODQUOT && 782 numdquot < MAXQUOTAS * desiredvnodes) 783 desireddquot += DQUOTINC; 784 if (numdquot < desireddquot) { 785 dq = (struct dquot *)malloc(sizeof *dq, M_DQUOT, M_WAITOK); 786 memset((char *)dq, 0, sizeof *dq); 787 numdquot++; 788 } else { 789 if ((dq = dqfreelist.tqh_first) == NULL) { 790 tablefull("dquot", 791 "increase kern.maxvnodes or NVNODE"); 792 *dqp = NODQUOT; 793 return (EUSERS); 794 } 795 if (dq->dq_cnt || (dq->dq_flags & DQ_MOD)) 796 panic("free dquot isn't"); 797 TAILQ_REMOVE(&dqfreelist, dq, dq_freelist); 798 LIST_REMOVE(dq, dq_hash); 799 } 800 /* 801 * Initialize the contents of the dquot structure. 802 */ 803 if (vp != dqvp) 804 vn_lock(dqvp, LK_EXCLUSIVE | LK_RETRY); 805 LIST_INSERT_HEAD(dqh, dq, dq_hash); 806 DQREF(dq); 807 dq->dq_flags = DQ_LOCK; 808 dq->dq_id = id; 809 dq->dq_ump = ump; 810 dq->dq_type = type; 811 auio.uio_iov = &aiov; 812 auio.uio_iovcnt = 1; 813 aiov.iov_base = (caddr_t)&dq->dq_dqb; 814 aiov.iov_len = sizeof (struct dqblk); 815 auio.uio_resid = sizeof (struct dqblk); 816 auio.uio_offset = (off_t)(id * sizeof (struct dqblk)); 817 auio.uio_segflg = UIO_SYSSPACE; 818 auio.uio_rw = UIO_READ; 819 auio.uio_lwp = (struct lwp *)0; 820 error = VOP_READ(dqvp, &auio, 0, ump->um_cred[type]); 821 if (auio.uio_resid == sizeof(struct dqblk) && error == 0) 822 memset((caddr_t)&dq->dq_dqb, 0, sizeof(struct dqblk)); 823 if (vp != dqvp) 824 VOP_UNLOCK(dqvp, 0); 825 if (dq->dq_flags & DQ_WANT) 826 wakeup((caddr_t)dq); 827 dq->dq_flags = 0; 828 /* 829 * I/O error in reading quota file, release 830 * quota structure and reflect problem to caller. 831 */ 832 if (error) { 833 LIST_REMOVE(dq, dq_hash); 834 dqrele(vp, dq); 835 *dqp = NODQUOT; 836 return (error); 837 } 838 /* 839 * Check for no limit to enforce. 840 * Initialize time values if necessary. 841 */ 842 if (dq->dq_isoftlimit == 0 && dq->dq_bsoftlimit == 0 && 843 dq->dq_ihardlimit == 0 && dq->dq_bhardlimit == 0) 844 dq->dq_flags |= DQ_FAKE; 845 if (dq->dq_id != 0) { 846 if (dq->dq_btime == 0) 847 dq->dq_btime = time.tv_sec + ump->um_btime[type]; 848 if (dq->dq_itime == 0) 849 dq->dq_itime = time.tv_sec + ump->um_itime[type]; 850 } 851 *dqp = dq; 852 return (0); 853 } 854 855 /* 856 * Obtain a reference to a dquot. 857 */ 858 void 859 dqref(dq) 860 struct dquot *dq; 861 { 862 863 dq->dq_cnt++; 864 } 865 866 /* 867 * Release a reference to a dquot. 868 */ 869 void 870 dqrele(vp, dq) 871 struct vnode *vp; 872 struct dquot *dq; 873 { 874 875 if (dq == NODQUOT) 876 return; 877 if (dq->dq_cnt > 1) { 878 dq->dq_cnt--; 879 return; 880 } 881 if (dq->dq_flags & DQ_MOD) 882 (void) dqsync(vp, dq); 883 if (--dq->dq_cnt > 0) 884 return; 885 TAILQ_INSERT_TAIL(&dqfreelist, dq, dq_freelist); 886 } 887 888 /* 889 * Update the disk quota in the quota file. 890 */ 891 int 892 dqsync(vp, dq) 893 struct vnode *vp; 894 struct dquot *dq; 895 { 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); 909 while (dq->dq_flags & DQ_LOCK) { 910 dq->dq_flags |= DQ_WANT; 911 (void) tsleep(dq, PINOD+2, "dqsync", 0); 912 if ((dq->dq_flags & DQ_MOD) == 0) { 913 if (vp != dqvp) 914 VOP_UNLOCK(dqvp, 0); 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_lwp = (struct lwp *)0; 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); 936 return (error); 937 } 938 939 /* 940 * Flush all entries from the cache for a particular vnode. 941 */ 942 void 943 dqflush(vp) 944 struct vnode *vp; 945 { 946 struct dquot *dq, *nextdq; 947 struct dqhashhead *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 = LIST_FIRST(dqh); dq; dq = nextdq) { 956 nextdq = LIST_NEXT(dq, dq_hash); 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 = NULL; 963 } 964 } 965 } 966
Indexes created Fri Oct 03 15:10:06 GMT 2025