ufs_quota.c revision 1.27
1 /* $NetBSD: ufs_quota.c,v 1.27 2003/06/29 22:32:48 fvdl 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 1.27 2003/06/29 22:32:48 fvdl 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(p, mp, type, fname) 366 struct proc *p; 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 int error; 376 struct nameidata nd; 377 378 vpp = &ump->um_quotas[type]; 379 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, fname, p); 380 if ((error = vn_open(&nd, FREAD|FWRITE, 0)) != 0) 381 return (error); 382 vp = nd.ni_vp; 383 VOP_UNLOCK(vp, 0); 384 if (vp->v_type != VREG) { 385 (void) vn_close(vp, FREAD|FWRITE, p->p_ucred, p); 386 return (EACCES); 387 } 388 if (*vpp != vp) 389 quotaoff(p, mp, type); 390 ump->um_qflags[type] |= QTF_OPENING; 391 mp->mnt_flag |= MNT_QUOTA; 392 vp->v_flag |= VSYSTEM; 393 *vpp = vp; 394 /* 395 * Save the credential of the process that turned on quotas. 396 * Set up the time limits for this quota. 397 */ 398 crhold(p->p_ucred); 399 ump->um_cred[type] = p->p_ucred; 400 ump->um_btime[type] = MAX_DQ_TIME; 401 ump->um_itime[type] = MAX_IQ_TIME; 402 if (dqget(NULLVP, 0, ump, type, &dq) == 0) { 403 if (dq->dq_btime > 0) 404 ump->um_btime[type] = dq->dq_btime; 405 if (dq->dq_itime > 0) 406 ump->um_itime[type] = dq->dq_itime; 407 dqrele(NULLVP, dq); 408 } 409 /* 410 * Search vnodes associated with this mount point, 411 * adding references to quota file being opened. 412 * NB: only need to add dquot's for inodes being modified. 413 */ 414 again: 415 for (vp = LIST_FIRST(&mp->mnt_vnodelist); vp != NULL; vp = nextvp) { 416 nextvp = LIST_NEXT(vp, v_mntvnodes); 417 if (vp->v_type == VNON ||vp->v_writecount == 0) 418 continue; 419 if (vget(vp, LK_EXCLUSIVE)) 420 goto again; 421 if ((error = getinoquota(VTOI(vp))) != 0) { 422 vput(vp); 423 break; 424 } 425 vput(vp); 426 if (LIST_NEXT(vp, v_mntvnodes) != nextvp || vp->v_mount != mp) 427 goto again; 428 } 429 ump->um_qflags[type] &= ~QTF_OPENING; 430 if (error) 431 quotaoff(p, mp, type); 432 return (error); 433 } 434 435 /* 436 * Q_QUOTAOFF - turn off disk quotas for a filesystem. 437 */ 438 int 439 quotaoff(p, mp, type) 440 struct proc *p; 441 struct mount *mp; 442 int type; 443 { 444 struct vnode *vp; 445 struct vnode *qvp, *nextvp; 446 struct ufsmount *ump = VFSTOUFS(mp); 447 struct dquot *dq; 448 struct inode *ip; 449 int error; 450 451 if ((qvp = ump->um_quotas[type]) == NULLVP) 452 return (0); 453 ump->um_qflags[type] |= QTF_CLOSING; 454 /* 455 * Search vnodes associated with this mount point, 456 * deleting any references to quota file being closed. 457 */ 458 again: 459 for (vp = LIST_FIRST(&mp->mnt_vnodelist); vp != NULL; vp = nextvp) { 460 nextvp = LIST_NEXT(vp, v_mntvnodes); 461 if (vp->v_type == VNON) 462 continue; 463 if (vget(vp, LK_EXCLUSIVE)) 464 goto again; 465 ip = VTOI(vp); 466 dq = ip->i_dquot[type]; 467 ip->i_dquot[type] = NODQUOT; 468 dqrele(vp, dq); 469 vput(vp); 470 if (LIST_NEXT(vp, v_mntvnodes) != nextvp || vp->v_mount != mp) 471 goto again; 472 } 473 dqflush(qvp); 474 qvp->v_flag &= ~VSYSTEM; 475 error = vn_close(qvp, FREAD|FWRITE, p->p_ucred, p); 476 ump->um_quotas[type] = NULLVP; 477 crfree(ump->um_cred[type]); 478 ump->um_cred[type] = NOCRED; 479 ump->um_qflags[type] &= ~QTF_CLOSING; 480 for (type = 0; type < MAXQUOTAS; type++) 481 if (ump->um_quotas[type] != NULLVP) 482 break; 483 if (type == MAXQUOTAS) 484 mp->mnt_flag &= ~MNT_QUOTA; 485 return (error); 486 } 487 488 /* 489 * Q_GETQUOTA - return current values in a dqblk structure. 490 */ 491 int 492 getquota(mp, id, type, addr) 493 struct mount *mp; 494 u_long id; 495 int type; 496 caddr_t addr; 497 { 498 struct dquot *dq; 499 int error; 500 501 if ((error = dqget(NULLVP, id, VFSTOUFS(mp), type, &dq)) != 0) 502 return (error); 503 error = copyout((caddr_t)&dq->dq_dqb, addr, sizeof (struct dqblk)); 504 dqrele(NULLVP, dq); 505 return (error); 506 } 507 508 /* 509 * Q_SETQUOTA - assign an entire dqblk structure. 510 */ 511 int 512 setquota(mp, id, type, addr) 513 struct mount *mp; 514 u_long id; 515 int type; 516 caddr_t addr; 517 { 518 struct dquot *dq; 519 struct dquot *ndq; 520 struct ufsmount *ump = VFSTOUFS(mp); 521 struct dqblk newlim; 522 int error; 523 524 error = copyin(addr, (caddr_t)&newlim, sizeof (struct dqblk)); 525 if (error) 526 return (error); 527 if ((error = dqget(NULLVP, id, ump, type, &ndq)) != 0) 528 return (error); 529 dq = ndq; 530 while (dq->dq_flags & DQ_LOCK) { 531 dq->dq_flags |= DQ_WANT; 532 (void) tsleep(dq, PINOD+1, "setquota", 0); 533 } 534 /* 535 * Copy all but the current values. 536 * Reset time limit if previously had no soft limit or were 537 * under it, but now have a soft limit and are over it. 538 */ 539 newlim.dqb_curblocks = dq->dq_curblocks; 540 newlim.dqb_curinodes = dq->dq_curinodes; 541 if (dq->dq_id != 0) { 542 newlim.dqb_btime = dq->dq_btime; 543 newlim.dqb_itime = dq->dq_itime; 544 } 545 if (newlim.dqb_bsoftlimit && 546 dq->dq_curblocks >= newlim.dqb_bsoftlimit && 547 (dq->dq_bsoftlimit == 0 || dq->dq_curblocks < dq->dq_bsoftlimit)) 548 newlim.dqb_btime = time.tv_sec + ump->um_btime[type]; 549 if (newlim.dqb_isoftlimit && 550 dq->dq_curinodes >= newlim.dqb_isoftlimit && 551 (dq->dq_isoftlimit == 0 || dq->dq_curinodes < dq->dq_isoftlimit)) 552 newlim.dqb_itime = time.tv_sec + ump->um_itime[type]; 553 dq->dq_dqb = newlim; 554 if (dq->dq_curblocks < dq->dq_bsoftlimit) 555 dq->dq_flags &= ~DQ_BLKS; 556 if (dq->dq_curinodes < dq->dq_isoftlimit) 557 dq->dq_flags &= ~DQ_INODS; 558 if (dq->dq_isoftlimit == 0 && dq->dq_bsoftlimit == 0 && 559 dq->dq_ihardlimit == 0 && dq->dq_bhardlimit == 0) 560 dq->dq_flags |= DQ_FAKE; 561 else 562 dq->dq_flags &= ~DQ_FAKE; 563 dq->dq_flags |= DQ_MOD; 564 dqrele(NULLVP, dq); 565 return (0); 566 } 567 568 /* 569 * Q_SETUSE - set current inode and block usage. 570 */ 571 int 572 setuse(mp, id, type, addr) 573 struct mount *mp; 574 u_long id; 575 int type; 576 caddr_t addr; 577 { 578 struct dquot *dq; 579 struct ufsmount *ump = VFSTOUFS(mp); 580 struct dquot *ndq; 581 struct dqblk usage; 582 int error; 583 584 error = copyin(addr, (caddr_t)&usage, sizeof (struct dqblk)); 585 if (error) 586 return (error); 587 if ((error = dqget(NULLVP, id, ump, type, &ndq)) != 0) 588 return (error); 589 dq = ndq; 590 while (dq->dq_flags & DQ_LOCK) { 591 dq->dq_flags |= DQ_WANT; 592 (void) tsleep(dq, PINOD+1, "setuse", 0); 593 } 594 /* 595 * Reset time limit if have a soft limit and were 596 * previously under it, but are now over it. 597 */ 598 if (dq->dq_bsoftlimit && dq->dq_curblocks < dq->dq_bsoftlimit && 599 usage.dqb_curblocks >= dq->dq_bsoftlimit) 600 dq->dq_btime = time.tv_sec + ump->um_btime[type]; 601 if (dq->dq_isoftlimit && dq->dq_curinodes < dq->dq_isoftlimit && 602 usage.dqb_curinodes >= dq->dq_isoftlimit) 603 dq->dq_itime = time.tv_sec + ump->um_itime[type]; 604 dq->dq_curblocks = usage.dqb_curblocks; 605 dq->dq_curinodes = usage.dqb_curinodes; 606 if (dq->dq_curblocks < dq->dq_bsoftlimit) 607 dq->dq_flags &= ~DQ_BLKS; 608 if (dq->dq_curinodes < dq->dq_isoftlimit) 609 dq->dq_flags &= ~DQ_INODS; 610 dq->dq_flags |= DQ_MOD; 611 dqrele(NULLVP, dq); 612 return (0); 613 } 614 615 /* 616 * Q_SYNC - sync quota files to disk. 617 */ 618 int 619 qsync(mp) 620 struct mount *mp; 621 { 622 struct ufsmount *ump = VFSTOUFS(mp); 623 struct vnode *vp, *nextvp; 624 struct dquot *dq; 625 int i, error; 626 627 /* 628 * Check if the mount point has any quotas. 629 * If not, simply return. 630 */ 631 for (i = 0; i < MAXQUOTAS; i++) 632 if (ump->um_quotas[i] != NULLVP) 633 break; 634 if (i == MAXQUOTAS) 635 return (0); 636 /* 637 * Search vnodes associated with this mount point, 638 * synchronizing any modified dquot structures. 639 */ 640 simple_lock(&mntvnode_slock); 641 again: 642 for (vp = LIST_FIRST(&mp->mnt_vnodelist); vp != NULL; vp = nextvp) { 643 if (vp->v_mount != mp) 644 goto again; 645 nextvp = LIST_NEXT(vp, v_mntvnodes); 646 if (vp->v_type == VNON) 647 continue; 648 simple_lock(&vp->v_interlock); 649 simple_unlock(&mntvnode_slock); 650 error = vget(vp, LK_EXCLUSIVE | LK_NOWAIT | LK_INTERLOCK); 651 if (error) { 652 simple_lock(&mntvnode_slock); 653 if (error == ENOENT) 654 goto again; 655 continue; 656 } 657 for (i = 0; i < MAXQUOTAS; i++) { 658 dq = VTOI(vp)->i_dquot[i]; 659 if (dq != NODQUOT && (dq->dq_flags & DQ_MOD)) 660 dqsync(vp, dq); 661 } 662 vput(vp); 663 simple_lock(&mntvnode_slock); 664 if (LIST_NEXT(vp, v_mntvnodes) != nextvp) 665 goto again; 666 } 667 simple_unlock(&mntvnode_slock); 668 return (0); 669 } 670 671 /* 672 * Code pertaining to management of the in-core dquot data structures. 673 */ 674 #define DQHASH(dqvp, id) \ 675 (((((long)(dqvp)) >> 8) + id) & dqhash) 676 LIST_HEAD(dqhashhead, dquot) *dqhashtbl; 677 u_long dqhash; 678 679 /* 680 * Dquot free list. 681 */ 682 #define DQUOTINC 5 /* minimum free dquots desired */ 683 TAILQ_HEAD(dqfreelist, dquot) dqfreelist; 684 long numdquot, desireddquot = DQUOTINC; 685 686 MALLOC_DEFINE(M_DQUOT, "UFS quota", "UFS quota entries"); 687 688 /* 689 * Initialize the quota system. 690 */ 691 void 692 dqinit() 693 { 694 dqhashtbl = 695 hashinit(desiredvnodes, HASH_LIST, M_DQUOT, M_WAITOK, &dqhash); 696 TAILQ_INIT(&dqfreelist); 697 } 698 699 void 700 dqreinit() 701 { 702 struct dquot *dq; 703 struct dqhashhead *oldhash, *hash; 704 struct vnode *dqvp; 705 u_long oldmask, mask, hashval; 706 int i; 707 708 hash = hashinit(desiredvnodes, HASH_LIST, M_DQUOT, M_WAITOK, &mask); 709 oldhash = dqhashtbl; 710 oldmask = dqhash; 711 dqhashtbl = hash; 712 dqhash = mask; 713 for (i = 0; i <= oldmask; i++) { 714 while ((dq = LIST_FIRST(&oldhash[i])) != NULL) { 715 dqvp = dq->dq_ump->um_quotas[dq->dq_type]; 716 LIST_REMOVE(dq, dq_hash); 717 hashval = DQHASH(dqvp, dq->dq_id); 718 LIST_INSERT_HEAD(&dqhashtbl[hashval], dq, dq_hash); 719 } 720 } 721 hashdone(oldhash, M_DQUOT); 722 } 723 724 /* 725 * Free resources held by quota system. 726 */ 727 void 728 dqdone() 729 { 730 hashdone(dqhashtbl, M_DQUOT); 731 } 732 733 /* 734 * Obtain a dquot structure for the specified identifier and quota file 735 * reading the information from the file if necessary. 736 */ 737 int 738 dqget(vp, id, ump, type, dqp) 739 struct vnode *vp; 740 u_long id; 741 struct ufsmount *ump; 742 int type; 743 struct dquot **dqp; 744 { 745 struct dquot *dq; 746 struct dqhashhead *dqh; 747 struct vnode *dqvp; 748 struct iovec aiov; 749 struct uio auio; 750 int error; 751 752 dqvp = ump->um_quotas[type]; 753 if (dqvp == NULLVP || (ump->um_qflags[type] & QTF_CLOSING)) { 754 *dqp = NODQUOT; 755 return (EINVAL); 756 } 757 /* 758 * Check the cache first. 759 */ 760 dqh = &dqhashtbl[DQHASH(dqvp, id)]; 761 LIST_FOREACH(dq, dqh, dq_hash) { 762 if (dq->dq_id != id || 763 dq->dq_ump->um_quotas[dq->dq_type] != dqvp) 764 continue; 765 /* 766 * Cache hit with no references. Take 767 * the structure off the free list. 768 */ 769 if (dq->dq_cnt == 0) 770 TAILQ_REMOVE(&dqfreelist, dq, dq_freelist); 771 DQREF(dq); 772 *dqp = dq; 773 return (0); 774 } 775 /* 776 * Not in cache, allocate a new one. 777 */ 778 if (dqfreelist.tqh_first == NODQUOT && 779 numdquot < MAXQUOTAS * desiredvnodes) 780 desireddquot += DQUOTINC; 781 if (numdquot < desireddquot) { 782 dq = (struct dquot *)malloc(sizeof *dq, M_DQUOT, M_WAITOK); 783 memset((char *)dq, 0, sizeof *dq); 784 numdquot++; 785 } else { 786 if ((dq = dqfreelist.tqh_first) == NULL) { 787 tablefull("dquot", 788 "increase kern.maxvnodes or NVNODE"); 789 *dqp = NODQUOT; 790 return (EUSERS); 791 } 792 if (dq->dq_cnt || (dq->dq_flags & DQ_MOD)) 793 panic("free dquot isn't"); 794 TAILQ_REMOVE(&dqfreelist, dq, dq_freelist); 795 LIST_REMOVE(dq, dq_hash); 796 } 797 /* 798 * Initialize the contents of the dquot structure. 799 */ 800 if (vp != dqvp) 801 vn_lock(dqvp, LK_EXCLUSIVE | LK_RETRY); 802 LIST_INSERT_HEAD(dqh, dq, dq_hash); 803 DQREF(dq); 804 dq->dq_flags = DQ_LOCK; 805 dq->dq_id = id; 806 dq->dq_ump = ump; 807 dq->dq_type = type; 808 auio.uio_iov = &aiov; 809 auio.uio_iovcnt = 1; 810 aiov.iov_base = (caddr_t)&dq->dq_dqb; 811 aiov.iov_len = sizeof (struct dqblk); 812 auio.uio_resid = sizeof (struct dqblk); 813 auio.uio_offset = (off_t)(id * sizeof (struct dqblk)); 814 auio.uio_segflg = UIO_SYSSPACE; 815 auio.uio_rw = UIO_READ; 816 auio.uio_procp = (struct proc *)0; 817 error = VOP_READ(dqvp, &auio, 0, ump->um_cred[type]); 818 if (auio.uio_resid == sizeof(struct dqblk) && error == 0) 819 memset((caddr_t)&dq->dq_dqb, 0, sizeof(struct dqblk)); 820 if (vp != dqvp) 821 VOP_UNLOCK(dqvp, 0); 822 if (dq->dq_flags & DQ_WANT) 823 wakeup((caddr_t)dq); 824 dq->dq_flags = 0; 825 /* 826 * I/O error in reading quota file, release 827 * quota structure and reflect problem to caller. 828 */ 829 if (error) { 830 LIST_REMOVE(dq, dq_hash); 831 dqrele(vp, dq); 832 *dqp = NODQUOT; 833 return (error); 834 } 835 /* 836 * Check for no limit to enforce. 837 * Initialize time values if necessary. 838 */ 839 if (dq->dq_isoftlimit == 0 && dq->dq_bsoftlimit == 0 && 840 dq->dq_ihardlimit == 0 && dq->dq_bhardlimit == 0) 841 dq->dq_flags |= DQ_FAKE; 842 if (dq->dq_id != 0) { 843 if (dq->dq_btime == 0) 844 dq->dq_btime = time.tv_sec + ump->um_btime[type]; 845 if (dq->dq_itime == 0) 846 dq->dq_itime = time.tv_sec + ump->um_itime[type]; 847 } 848 *dqp = dq; 849 return (0); 850 } 851 852 /* 853 * Obtain a reference to a dquot. 854 */ 855 void 856 dqref(dq) 857 struct dquot *dq; 858 { 859 860 dq->dq_cnt++; 861 } 862 863 /* 864 * Release a reference to a dquot. 865 */ 866 void 867 dqrele(vp, dq) 868 struct vnode *vp; 869 struct dquot *dq; 870 { 871 872 if (dq == NODQUOT) 873 return; 874 if (dq->dq_cnt > 1) { 875 dq->dq_cnt--; 876 return; 877 } 878 if (dq->dq_flags & DQ_MOD) 879 (void) dqsync(vp, dq); 880 if (--dq->dq_cnt > 0) 881 return; 882 TAILQ_INSERT_TAIL(&dqfreelist, dq, dq_freelist); 883 } 884 885 /* 886 * Update the disk quota in the quota file. 887 */ 888 int 889 dqsync(vp, dq) 890 struct vnode *vp; 891 struct dquot *dq; 892 { 893 struct vnode *dqvp; 894 struct iovec aiov; 895 struct uio auio; 896 int error; 897 898 if (dq == NODQUOT) 899 panic("dqsync: dquot"); 900 if ((dq->dq_flags & DQ_MOD) == 0) 901 return (0); 902 if ((dqvp = dq->dq_ump->um_quotas[dq->dq_type]) == NULLVP) 903 panic("dqsync: file"); 904 if (vp != dqvp) 905 vn_lock(dqvp, LK_EXCLUSIVE | LK_RETRY); 906 while (dq->dq_flags & DQ_LOCK) { 907 dq->dq_flags |= DQ_WANT; 908 (void) tsleep(dq, PINOD+2, "dqsync", 0); 909 if ((dq->dq_flags & DQ_MOD) == 0) { 910 if (vp != dqvp) 911 VOP_UNLOCK(dqvp, 0); 912 return (0); 913 } 914 } 915 dq->dq_flags |= DQ_LOCK; 916 auio.uio_iov = &aiov; 917 auio.uio_iovcnt = 1; 918 aiov.iov_base = (caddr_t)&dq->dq_dqb; 919 aiov.iov_len = sizeof (struct dqblk); 920 auio.uio_resid = sizeof (struct dqblk); 921 auio.uio_offset = (off_t)(dq->dq_id * sizeof (struct dqblk)); 922 auio.uio_segflg = UIO_SYSSPACE; 923 auio.uio_rw = UIO_WRITE; 924 auio.uio_procp = (struct proc *)0; 925 error = VOP_WRITE(dqvp, &auio, 0, dq->dq_ump->um_cred[dq->dq_type]); 926 if (auio.uio_resid && error == 0) 927 error = EIO; 928 if (dq->dq_flags & DQ_WANT) 929 wakeup((caddr_t)dq); 930 dq->dq_flags &= ~(DQ_MOD|DQ_LOCK|DQ_WANT); 931 if (vp != dqvp) 932 VOP_UNLOCK(dqvp, 0); 933 return (error); 934 } 935 936 /* 937 * Flush all entries from the cache for a particular vnode. 938 */ 939 void 940 dqflush(vp) 941 struct vnode *vp; 942 { 943 struct dquot *dq, *nextdq; 944 struct dqhashhead *dqh; 945 946 /* 947 * Move all dquot's that used to refer to this quota 948 * file off their hash chains (they will eventually 949 * fall off the head of the free list and be re-used). 950 */ 951 for (dqh = &dqhashtbl[dqhash]; dqh >= dqhashtbl; dqh--) { 952 for (dq = LIST_FIRST(dqh); dq; dq = nextdq) { 953 nextdq = LIST_NEXT(dq, dq_hash); 954 if (dq->dq_ump->um_quotas[dq->dq_type] != vp) 955 continue; 956 if (dq->dq_cnt) 957 panic("dqflush: stray dquot"); 958 LIST_REMOVE(dq, dq_hash); 959 dq->dq_ump = NULL; 960 } 961 } 962 } 963
Indexes created Tue Oct 07 21:09:53 GMT 2025