ufs_quota.c revision 1.42
1 /* $NetBSD: ufs_quota.c,v 1.42 2006/10/20 18:58:13 reinoud 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 1.42 2006/10/20 18:58:13 reinoud 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 #include <sys/kauth.h> 50 51 #include <ufs/ufs/quota.h> 52 #include <ufs/ufs/inode.h> 53 #include <ufs/ufs/ufsmount.h> 54 #include <ufs/ufs/ufs_extern.h> 55 56 /* 57 * Quota name to error message mapping. 58 */ 59 static const char *quotatypes[] = INITQFNAMES; 60 61 /* 62 * Set up the quotas for an inode. 63 * 64 * This routine completely defines the semantics of quotas. 65 * If other criterion want to be used to establish quotas, the 66 * MAXQUOTAS value in quotas.h should be increased, and the 67 * additional dquots set up here. 68 */ 69 int 70 getinoquota(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(struct inode *ip, int64_t change, kauth_cred_t cred, int flags) 102 { 103 struct dquot *dq; 104 int i; 105 int ncurblocks, error; 106 107 #ifdef DIAGNOSTIC 108 if ((flags & CHOWN) == 0) 109 chkdquot(ip); 110 #endif 111 if (change == 0) 112 return (0); 113 if (change < 0) { 114 for (i = 0; i < MAXQUOTAS; i++) { 115 if ((dq = ip->i_dquot[i]) == NODQUOT) 116 continue; 117 while (dq->dq_flags & DQ_LOCK) { 118 dq->dq_flags |= DQ_WANT; 119 (void) tsleep(dq, PINOD+1, "chkdq", 0); 120 } 121 ncurblocks = dq->dq_curblocks + change; 122 if (ncurblocks >= 0) 123 dq->dq_curblocks = ncurblocks; 124 else 125 dq->dq_curblocks = 0; 126 dq->dq_flags &= ~DQ_BLKS; 127 dq->dq_flags |= DQ_MOD; 128 } 129 return (0); 130 } 131 if ((flags & FORCE) == 0 && 132 (cred != NOCRED && kauth_cred_geteuid(cred) != 0)) { 133 for (i = 0; i < MAXQUOTAS; i++) { 134 if ((dq = ip->i_dquot[i]) == NODQUOT) 135 continue; 136 if ((error = chkdqchg(ip, change, cred, i)) != 0) 137 return (error); 138 } 139 } 140 for (i = 0; i < MAXQUOTAS; i++) { 141 if ((dq = ip->i_dquot[i]) == NODQUOT) 142 continue; 143 while (dq->dq_flags & DQ_LOCK) { 144 dq->dq_flags |= DQ_WANT; 145 (void) tsleep(dq, PINOD+1, "chkdq", 0); 146 } 147 dq->dq_curblocks += change; 148 dq->dq_flags |= DQ_MOD; 149 } 150 return (0); 151 } 152 153 /* 154 * Check for a valid change to a users allocation. 155 * Issue an error message if appropriate. 156 */ 157 int 158 chkdqchg(struct inode *ip, int64_t change, kauth_cred_t cred, int type) 159 { 160 struct dquot *dq = ip->i_dquot[type]; 161 long ncurblocks = dq->dq_curblocks + change; 162 163 /* 164 * If user would exceed their hard limit, disallow space allocation. 165 */ 166 if (ncurblocks >= dq->dq_bhardlimit && dq->dq_bhardlimit) { 167 if ((dq->dq_flags & DQ_BLKS) == 0 && 168 ip->i_uid == kauth_cred_geteuid(cred)) { 169 uprintf("\n%s: write failed, %s disk limit reached\n", 170 ITOV(ip)->v_mount->mnt_stat.f_mntonname, 171 quotatypes[type]); 172 dq->dq_flags |= DQ_BLKS; 173 } 174 return (EDQUOT); 175 } 176 /* 177 * If user is over their soft limit for too long, disallow space 178 * allocation. Reset time limit as they cross their soft limit. 179 */ 180 if (ncurblocks >= dq->dq_bsoftlimit && dq->dq_bsoftlimit) { 181 if (dq->dq_curblocks < dq->dq_bsoftlimit) { 182 dq->dq_btime = time_second + ip->i_ump->um_btime[type]; 183 if (ip->i_uid == kauth_cred_geteuid(cred)) 184 uprintf("\n%s: warning, %s %s\n", 185 ITOV(ip)->v_mount->mnt_stat.f_mntonname, 186 quotatypes[type], "disk quota exceeded"); 187 return (0); 188 } 189 if (time_second > dq->dq_btime) { 190 if ((dq->dq_flags & DQ_BLKS) == 0 && 191 ip->i_uid == kauth_cred_geteuid(cred)) { 192 uprintf("\n%s: write failed, %s %s\n", 193 ITOV(ip)->v_mount->mnt_stat.f_mntonname, 194 quotatypes[type], 195 "disk quota exceeded for too long"); 196 dq->dq_flags |= DQ_BLKS; 197 } 198 return (EDQUOT); 199 } 200 } 201 return (0); 202 } 203 204 /* 205 * Check the inode limit, applying corrective action. 206 */ 207 int 208 chkiq(struct inode *ip, int32_t change, kauth_cred_t cred, int flags) 209 { 210 struct dquot *dq; 211 int i; 212 int ncurinodes, error; 213 214 #ifdef DIAGNOSTIC 215 if ((flags & CHOWN) == 0) 216 chkdquot(ip); 217 #endif 218 if (change == 0) 219 return (0); 220 if (change < 0) { 221 for (i = 0; i < MAXQUOTAS; i++) { 222 if ((dq = ip->i_dquot[i]) == NODQUOT) 223 continue; 224 while (dq->dq_flags & DQ_LOCK) { 225 dq->dq_flags |= DQ_WANT; 226 (void) tsleep(dq, PINOD+1, "chkiq", 0); 227 } 228 ncurinodes = dq->dq_curinodes + change; 229 if (ncurinodes >= 0) 230 dq->dq_curinodes = ncurinodes; 231 else 232 dq->dq_curinodes = 0; 233 dq->dq_flags &= ~DQ_INODS; 234 dq->dq_flags |= DQ_MOD; 235 } 236 return (0); 237 } 238 if ((flags & FORCE) == 0 && kauth_cred_geteuid(cred) != 0) { 239 for (i = 0; i < MAXQUOTAS; i++) { 240 if ((dq = ip->i_dquot[i]) == NODQUOT) 241 continue; 242 if ((error = chkiqchg(ip, change, cred, i)) != 0) 243 return (error); 244 } 245 } 246 for (i = 0; i < MAXQUOTAS; i++) { 247 if ((dq = ip->i_dquot[i]) == NODQUOT) 248 continue; 249 while (dq->dq_flags & DQ_LOCK) { 250 dq->dq_flags |= DQ_WANT; 251 (void) tsleep(dq, PINOD+1, "chkiq", 0); 252 } 253 dq->dq_curinodes += change; 254 dq->dq_flags |= DQ_MOD; 255 } 256 return (0); 257 } 258 259 /* 260 * Check for a valid change to a users allocation. 261 * Issue an error message if appropriate. 262 */ 263 int 264 chkiqchg(struct inode *ip, int32_t change, kauth_cred_t cred, int type) 265 { 266 struct dquot *dq = ip->i_dquot[type]; 267 long ncurinodes = dq->dq_curinodes + change; 268 269 /* 270 * If user would exceed their hard limit, disallow inode allocation. 271 */ 272 if (ncurinodes >= dq->dq_ihardlimit && dq->dq_ihardlimit) { 273 if ((dq->dq_flags & DQ_INODS) == 0 && 274 ip->i_uid == kauth_cred_geteuid(cred)) { 275 uprintf("\n%s: write failed, %s inode limit reached\n", 276 ITOV(ip)->v_mount->mnt_stat.f_mntonname, 277 quotatypes[type]); 278 dq->dq_flags |= DQ_INODS; 279 } 280 return (EDQUOT); 281 } 282 /* 283 * If user is over their soft limit for too long, disallow inode 284 * allocation. Reset time limit as they cross their soft limit. 285 */ 286 if (ncurinodes >= dq->dq_isoftlimit && dq->dq_isoftlimit) { 287 if (dq->dq_curinodes < dq->dq_isoftlimit) { 288 dq->dq_itime = time_second + ip->i_ump->um_itime[type]; 289 if (ip->i_uid == kauth_cred_geteuid(cred)) 290 uprintf("\n%s: warning, %s %s\n", 291 ITOV(ip)->v_mount->mnt_stat.f_mntonname, 292 quotatypes[type], "inode quota exceeded"); 293 return (0); 294 } 295 if (time_second > dq->dq_itime) { 296 if ((dq->dq_flags & DQ_INODS) == 0 && 297 ip->i_uid == kauth_cred_geteuid(cred)) { 298 uprintf("\n%s: write failed, %s %s\n", 299 ITOV(ip)->v_mount->mnt_stat.f_mntonname, 300 quotatypes[type], 301 "inode quota exceeded for too long"); 302 dq->dq_flags |= DQ_INODS; 303 } 304 return (EDQUOT); 305 } 306 } 307 return (0); 308 } 309 310 #ifdef DIAGNOSTIC 311 /* 312 * On filesystems with quotas enabled, it is an error for a file to change 313 * size and not to have a dquot structure associated with it. 314 */ 315 void 316 chkdquot(struct inode *ip) 317 { 318 struct ufsmount *ump = ip->i_ump; 319 int i; 320 321 for (i = 0; i < MAXQUOTAS; i++) { 322 if (ump->um_quotas[i] == NULLVP || 323 (ump->um_qflags[i] & (QTF_OPENING|QTF_CLOSING))) 324 continue; 325 if (ip->i_dquot[i] == NODQUOT) { 326 vprint("chkdquot: missing dquot", ITOV(ip)); 327 panic("missing dquot"); 328 } 329 } 330 } 331 #endif 332 333 /* 334 * Code to process quotactl commands. 335 */ 336 337 /* 338 * Q_QUOTAON - set up a quota file for a particular file system. 339 */ 340 int 341 quotaon(struct lwp *l, struct mount *mp, int type, caddr_t fname) 342 { 343 struct ufsmount *ump = VFSTOUFS(mp); 344 struct vnode *vp, **vpp; 345 struct vnode *nextvp; 346 struct dquot *dq; 347 int error; 348 struct nameidata nd; 349 350 vpp = &ump->um_quotas[type]; 351 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, fname, l); 352 if ((error = vn_open(&nd, FREAD|FWRITE, 0)) != 0) 353 return (error); 354 vp = nd.ni_vp; 355 VOP_UNLOCK(vp, 0); 356 if (vp->v_type != VREG) { 357 (void) vn_close(vp, FREAD|FWRITE, l->l_cred, l); 358 return (EACCES); 359 } 360 if (*vpp != vp) 361 quotaoff(l, mp, type); 362 ump->um_qflags[type] |= QTF_OPENING; 363 mp->mnt_flag |= MNT_QUOTA; 364 vp->v_flag |= VSYSTEM; 365 *vpp = vp; 366 /* 367 * Save the credential of the process that turned on quotas. 368 * Set up the time limits for this quota. 369 */ 370 kauth_cred_hold(l->l_cred); 371 ump->um_cred[type] = l->l_cred; 372 ump->um_btime[type] = MAX_DQ_TIME; 373 ump->um_itime[type] = MAX_IQ_TIME; 374 if (dqget(NULLVP, 0, ump, type, &dq) == 0) { 375 if (dq->dq_btime > 0) 376 ump->um_btime[type] = dq->dq_btime; 377 if (dq->dq_itime > 0) 378 ump->um_itime[type] = dq->dq_itime; 379 dqrele(NULLVP, dq); 380 } 381 /* 382 * Search vnodes associated with this mount point, 383 * adding references to quota file being opened. 384 * NB: only need to add dquot's for inodes being modified. 385 */ 386 again: 387 TAILQ_FOREACH(vp, &mp->mnt_vnodelist, v_mntvnodes) { 388 nextvp = TAILQ_NEXT(vp, v_mntvnodes); 389 if (vp->v_mount != mp) 390 goto again; 391 if (vp->v_type == VNON ||vp->v_writecount == 0) 392 continue; 393 if (vget(vp, LK_EXCLUSIVE)) 394 goto again; 395 if ((error = getinoquota(VTOI(vp))) != 0) { 396 vput(vp); 397 break; 398 } 399 vput(vp); 400 /* if the list changed, start again */ 401 if (TAILQ_NEXT(vp, v_mntvnodes) != nextvp) 402 goto again; 403 } 404 ump->um_qflags[type] &= ~QTF_OPENING; 405 if (error) 406 quotaoff(l, mp, type); 407 return (error); 408 } 409 410 /* 411 * Q_QUOTAOFF - turn off disk quotas for a filesystem. 412 */ 413 int 414 quotaoff(struct lwp *l, struct mount *mp, int type) 415 { 416 struct vnode *vp; 417 struct vnode *qvp, *nextvp; 418 struct ufsmount *ump = VFSTOUFS(mp); 419 struct dquot *dq; 420 struct inode *ip; 421 int error; 422 423 if ((qvp = ump->um_quotas[type]) == NULLVP) 424 return (0); 425 ump->um_qflags[type] |= QTF_CLOSING; 426 /* 427 * Search vnodes associated with this mount point, 428 * deleting any references to quota file being closed. 429 */ 430 again: 431 TAILQ_FOREACH(vp, &mp->mnt_vnodelist, v_mntvnodes) { 432 nextvp = TAILQ_NEXT(vp, v_mntvnodes); 433 if (vp->v_mount != mp) 434 goto again; 435 if (vp->v_type == VNON) 436 continue; 437 if (vget(vp, LK_EXCLUSIVE)) 438 goto again; 439 ip = VTOI(vp); 440 dq = ip->i_dquot[type]; 441 ip->i_dquot[type] = NODQUOT; 442 dqrele(vp, dq); 443 vput(vp); 444 /* if the list changed, start again */ 445 if (TAILQ_NEXT(vp, v_mntvnodes) != nextvp) 446 goto again; 447 } 448 dqflush(qvp); 449 qvp->v_flag &= ~VSYSTEM; 450 error = vn_close(qvp, FREAD|FWRITE, l->l_cred, l); 451 ump->um_quotas[type] = NULLVP; 452 kauth_cred_free(ump->um_cred[type]); 453 ump->um_cred[type] = NOCRED; 454 ump->um_qflags[type] &= ~QTF_CLOSING; 455 for (type = 0; type < MAXQUOTAS; type++) 456 if (ump->um_quotas[type] != NULLVP) 457 break; 458 if (type == MAXQUOTAS) 459 mp->mnt_flag &= ~MNT_QUOTA; 460 return (error); 461 } 462 463 /* 464 * Q_GETQUOTA - return current values in a dqblk structure. 465 */ 466 int 467 getquota(struct mount *mp, u_long id, int type, caddr_t addr) 468 { 469 struct dquot *dq; 470 int error; 471 472 if ((error = dqget(NULLVP, id, VFSTOUFS(mp), type, &dq)) != 0) 473 return (error); 474 error = copyout((caddr_t)&dq->dq_dqb, addr, sizeof (struct dqblk)); 475 dqrele(NULLVP, dq); 476 return (error); 477 } 478 479 /* 480 * Q_SETQUOTA - assign an entire dqblk structure. 481 */ 482 int 483 setquota(struct mount *mp, u_long id, int type, caddr_t addr) 484 { 485 struct dquot *dq; 486 struct dquot *ndq; 487 struct ufsmount *ump = VFSTOUFS(mp); 488 struct dqblk newlim; 489 int error; 490 491 error = copyin(addr, (caddr_t)&newlim, sizeof (struct dqblk)); 492 if (error) 493 return (error); 494 if ((error = dqget(NULLVP, id, ump, type, &ndq)) != 0) 495 return (error); 496 dq = ndq; 497 while (dq->dq_flags & DQ_LOCK) { 498 dq->dq_flags |= DQ_WANT; 499 (void) tsleep(dq, PINOD+1, "setquota", 0); 500 } 501 /* 502 * Copy all but the current values. 503 * Reset time limit if previously had no soft limit or were 504 * under it, but now have a soft limit and are over it. 505 */ 506 newlim.dqb_curblocks = dq->dq_curblocks; 507 newlim.dqb_curinodes = dq->dq_curinodes; 508 if (dq->dq_id != 0) { 509 newlim.dqb_btime = dq->dq_btime; 510 newlim.dqb_itime = dq->dq_itime; 511 } 512 if (newlim.dqb_bsoftlimit && 513 dq->dq_curblocks >= newlim.dqb_bsoftlimit && 514 (dq->dq_bsoftlimit == 0 || dq->dq_curblocks < dq->dq_bsoftlimit)) 515 newlim.dqb_btime = time_second + ump->um_btime[type]; 516 if (newlim.dqb_isoftlimit && 517 dq->dq_curinodes >= newlim.dqb_isoftlimit && 518 (dq->dq_isoftlimit == 0 || dq->dq_curinodes < dq->dq_isoftlimit)) 519 newlim.dqb_itime = time_second + ump->um_itime[type]; 520 dq->dq_dqb = newlim; 521 if (dq->dq_curblocks < dq->dq_bsoftlimit) 522 dq->dq_flags &= ~DQ_BLKS; 523 if (dq->dq_curinodes < dq->dq_isoftlimit) 524 dq->dq_flags &= ~DQ_INODS; 525 if (dq->dq_isoftlimit == 0 && dq->dq_bsoftlimit == 0 && 526 dq->dq_ihardlimit == 0 && dq->dq_bhardlimit == 0) 527 dq->dq_flags |= DQ_FAKE; 528 else 529 dq->dq_flags &= ~DQ_FAKE; 530 dq->dq_flags |= DQ_MOD; 531 dqrele(NULLVP, dq); 532 return (0); 533 } 534 535 /* 536 * Q_SETUSE - set current inode and block usage. 537 */ 538 int 539 setuse(struct mount *mp, u_long id, int type, caddr_t addr) 540 { 541 struct dquot *dq; 542 struct ufsmount *ump = VFSTOUFS(mp); 543 struct dquot *ndq; 544 struct dqblk usage; 545 int error; 546 547 error = copyin(addr, (caddr_t)&usage, sizeof (struct dqblk)); 548 if (error) 549 return (error); 550 if ((error = dqget(NULLVP, id, ump, type, &ndq)) != 0) 551 return (error); 552 dq = ndq; 553 while (dq->dq_flags & DQ_LOCK) { 554 dq->dq_flags |= DQ_WANT; 555 (void) tsleep(dq, PINOD+1, "setuse", 0); 556 } 557 /* 558 * Reset time limit if have a soft limit and were 559 * previously under it, but are now over it. 560 */ 561 if (dq->dq_bsoftlimit && dq->dq_curblocks < dq->dq_bsoftlimit && 562 usage.dqb_curblocks >= dq->dq_bsoftlimit) 563 dq->dq_btime = time_second + ump->um_btime[type]; 564 if (dq->dq_isoftlimit && dq->dq_curinodes < dq->dq_isoftlimit && 565 usage.dqb_curinodes >= dq->dq_isoftlimit) 566 dq->dq_itime = time_second + ump->um_itime[type]; 567 dq->dq_curblocks = usage.dqb_curblocks; 568 dq->dq_curinodes = usage.dqb_curinodes; 569 if (dq->dq_curblocks < dq->dq_bsoftlimit) 570 dq->dq_flags &= ~DQ_BLKS; 571 if (dq->dq_curinodes < dq->dq_isoftlimit) 572 dq->dq_flags &= ~DQ_INODS; 573 dq->dq_flags |= DQ_MOD; 574 dqrele(NULLVP, dq); 575 return (0); 576 } 577 578 /* 579 * Q_SYNC - sync quota files to disk. 580 */ 581 int 582 qsync(struct mount *mp) 583 { 584 struct ufsmount *ump = VFSTOUFS(mp); 585 struct vnode *vp, *nextvp; 586 struct dquot *dq; 587 int i, error; 588 589 /* 590 * Check if the mount point has any quotas. 591 * If not, simply return. 592 */ 593 for (i = 0; i < MAXQUOTAS; i++) 594 if (ump->um_quotas[i] != NULLVP) 595 break; 596 if (i == MAXQUOTAS) 597 return (0); 598 /* 599 * Search vnodes associated with this mount point, 600 * synchronizing any modified dquot structures. 601 */ 602 simple_lock(&mntvnode_slock); 603 again: 604 TAILQ_FOREACH(vp, &mp->mnt_vnodelist, v_mntvnodes) { 605 nextvp = TAILQ_NEXT(vp, v_mntvnodes); 606 if (vp->v_mount != mp) 607 goto again; 608 if (vp->v_type == VNON) 609 continue; 610 simple_lock(&vp->v_interlock); 611 simple_unlock(&mntvnode_slock); 612 error = vget(vp, LK_EXCLUSIVE | LK_NOWAIT | LK_INTERLOCK); 613 if (error) { 614 simple_lock(&mntvnode_slock); 615 if (error == ENOENT) 616 goto again; 617 continue; 618 } 619 for (i = 0; i < MAXQUOTAS; i++) { 620 dq = VTOI(vp)->i_dquot[i]; 621 if (dq != NODQUOT && (dq->dq_flags & DQ_MOD)) 622 dqsync(vp, dq); 623 } 624 vput(vp); 625 simple_lock(&mntvnode_slock); 626 /* if the list changed, start again */ 627 if (TAILQ_NEXT(vp, v_mntvnodes) != nextvp) 628 goto again; 629 } 630 simple_unlock(&mntvnode_slock); 631 return (0); 632 } 633 634 /* 635 * Code pertaining to management of the in-core dquot data structures. 636 */ 637 #define DQHASH(dqvp, id) \ 638 (((((long)(dqvp)) >> 8) + id) & dqhash) 639 static LIST_HEAD(dqhashhead, dquot) *dqhashtbl; 640 static u_long dqhash; 641 642 /* 643 * Dquot free list. 644 */ 645 #define DQUOTINC 5 /* minimum free dquots desired */ 646 static TAILQ_HEAD(dqfreelist, dquot) dqfreelist; 647 static long numdquot, desireddquot = DQUOTINC; 648 649 MALLOC_DEFINE(M_DQUOT, "UFS quota", "UFS quota entries"); 650 651 /* 652 * Initialize the quota system. 653 */ 654 void 655 dqinit(void) 656 { 657 dqhashtbl = 658 hashinit(desiredvnodes, HASH_LIST, M_DQUOT, M_WAITOK, &dqhash); 659 TAILQ_INIT(&dqfreelist); 660 } 661 662 void 663 dqreinit(void) 664 { 665 struct dquot *dq; 666 struct dqhashhead *oldhash, *hash; 667 struct vnode *dqvp; 668 u_long oldmask, mask, hashval; 669 int i; 670 671 hash = hashinit(desiredvnodes, HASH_LIST, M_DQUOT, M_WAITOK, &mask); 672 oldhash = dqhashtbl; 673 oldmask = dqhash; 674 dqhashtbl = hash; 675 dqhash = mask; 676 for (i = 0; i <= oldmask; i++) { 677 while ((dq = LIST_FIRST(&oldhash[i])) != NULL) { 678 dqvp = dq->dq_ump->um_quotas[dq->dq_type]; 679 LIST_REMOVE(dq, dq_hash); 680 hashval = DQHASH(dqvp, dq->dq_id); 681 LIST_INSERT_HEAD(&dqhashtbl[hashval], dq, dq_hash); 682 } 683 } 684 hashdone(oldhash, M_DQUOT); 685 } 686 687 /* 688 * Free resources held by quota system. 689 */ 690 void 691 dqdone(void) 692 { 693 hashdone(dqhashtbl, M_DQUOT); 694 } 695 696 /* 697 * Obtain a dquot structure for the specified identifier and quota file 698 * reading the information from the file if necessary. 699 */ 700 int 701 dqget(struct vnode *vp, u_long id, struct ufsmount *ump, int type, 702 struct dquot **dqp) 703 { 704 struct dquot *dq; 705 struct dqhashhead *dqh; 706 struct vnode *dqvp; 707 struct iovec aiov; 708 struct uio auio; 709 int error; 710 711 dqvp = ump->um_quotas[type]; 712 if (dqvp == NULLVP || (ump->um_qflags[type] & QTF_CLOSING)) { 713 *dqp = NODQUOT; 714 return (EINVAL); 715 } 716 /* 717 * Check the cache first. 718 */ 719 dqh = &dqhashtbl[DQHASH(dqvp, id)]; 720 LIST_FOREACH(dq, dqh, dq_hash) { 721 if (dq->dq_id != id || 722 dq->dq_ump->um_quotas[dq->dq_type] != dqvp) 723 continue; 724 /* 725 * Cache hit with no references. Take 726 * the structure off the free list. 727 */ 728 if (dq->dq_cnt == 0) 729 TAILQ_REMOVE(&dqfreelist, dq, dq_freelist); 730 dqref(dq); 731 *dqp = dq; 732 return (0); 733 } 734 /* 735 * Not in cache, allocate a new one. 736 */ 737 if (dqfreelist.tqh_first == NODQUOT && 738 numdquot < MAXQUOTAS * desiredvnodes) 739 desireddquot += DQUOTINC; 740 if (numdquot < desireddquot) { 741 dq = (struct dquot *)malloc(sizeof *dq, M_DQUOT, M_WAITOK); 742 memset((char *)dq, 0, sizeof *dq); 743 numdquot++; 744 } else { 745 if ((dq = dqfreelist.tqh_first) == NULL) { 746 tablefull("dquot", 747 "increase kern.maxvnodes or NVNODE"); 748 *dqp = NODQUOT; 749 return (EUSERS); 750 } 751 if (dq->dq_cnt || (dq->dq_flags & DQ_MOD)) 752 panic("free dquot isn't"); 753 TAILQ_REMOVE(&dqfreelist, dq, dq_freelist); 754 LIST_REMOVE(dq, dq_hash); 755 } 756 /* 757 * Initialize the contents of the dquot structure. 758 */ 759 if (vp != dqvp) 760 vn_lock(dqvp, LK_EXCLUSIVE | LK_RETRY); 761 LIST_INSERT_HEAD(dqh, dq, dq_hash); 762 dqref(dq); 763 dq->dq_flags = DQ_LOCK; 764 dq->dq_id = id; 765 dq->dq_ump = ump; 766 dq->dq_type = type; 767 auio.uio_iov = &aiov; 768 auio.uio_iovcnt = 1; 769 aiov.iov_base = (caddr_t)&dq->dq_dqb; 770 aiov.iov_len = sizeof (struct dqblk); 771 auio.uio_resid = sizeof (struct dqblk); 772 auio.uio_offset = (off_t)(id * sizeof (struct dqblk)); 773 auio.uio_rw = UIO_READ; 774 UIO_SETUP_SYSSPACE(&auio); 775 error = VOP_READ(dqvp, &auio, 0, ump->um_cred[type]); 776 if (auio.uio_resid == sizeof(struct dqblk) && error == 0) 777 memset((caddr_t)&dq->dq_dqb, 0, sizeof(struct dqblk)); 778 if (vp != dqvp) 779 VOP_UNLOCK(dqvp, 0); 780 if (dq->dq_flags & DQ_WANT) 781 wakeup((caddr_t)dq); 782 dq->dq_flags = 0; 783 /* 784 * I/O error in reading quota file, release 785 * quota structure and reflect problem to caller. 786 */ 787 if (error) { 788 LIST_REMOVE(dq, dq_hash); 789 dqrele(vp, dq); 790 *dqp = NODQUOT; 791 return (error); 792 } 793 /* 794 * Check for no limit to enforce. 795 * Initialize time values if necessary. 796 */ 797 if (dq->dq_isoftlimit == 0 && dq->dq_bsoftlimit == 0 && 798 dq->dq_ihardlimit == 0 && dq->dq_bhardlimit == 0) 799 dq->dq_flags |= DQ_FAKE; 800 if (dq->dq_id != 0) { 801 if (dq->dq_btime == 0) 802 dq->dq_btime = time_second + ump->um_btime[type]; 803 if (dq->dq_itime == 0) 804 dq->dq_itime = time_second + ump->um_itime[type]; 805 } 806 *dqp = dq; 807 return (0); 808 } 809 810 /* 811 * Obtain a reference to a dquot. 812 */ 813 void 814 dqref(struct dquot *dq) 815 { 816 817 dq->dq_cnt++; 818 } 819 820 /* 821 * Release a reference to a dquot. 822 */ 823 void 824 dqrele(struct vnode *vp, struct dquot *dq) 825 { 826 827 if (dq == NODQUOT) 828 return; 829 if (dq->dq_cnt > 1) { 830 dq->dq_cnt--; 831 return; 832 } 833 if (dq->dq_flags & DQ_MOD) 834 (void) dqsync(vp, dq); 835 if (--dq->dq_cnt > 0) 836 return; 837 TAILQ_INSERT_TAIL(&dqfreelist, dq, dq_freelist); 838 } 839 840 /* 841 * Update the disk quota in the quota file. 842 */ 843 int 844 dqsync(struct vnode *vp, struct dquot *dq) 845 { 846 struct vnode *dqvp; 847 struct mount *mp; 848 struct iovec aiov; 849 struct uio auio; 850 int error; 851 852 if (dq == NODQUOT) 853 panic("dqsync: dquot"); 854 if ((dq->dq_flags & DQ_MOD) == 0) 855 return (0); 856 if ((dqvp = dq->dq_ump->um_quotas[dq->dq_type]) == NULLVP) 857 panic("dqsync: file"); 858 vn_start_write(dqvp, &mp, V_WAIT | V_LOWER); 859 if (vp != dqvp) 860 vn_lock(dqvp, LK_EXCLUSIVE | LK_RETRY); 861 while (dq->dq_flags & DQ_LOCK) { 862 dq->dq_flags |= DQ_WANT; 863 (void) tsleep(dq, PINOD+2, "dqsync", 0); 864 if ((dq->dq_flags & DQ_MOD) == 0) { 865 if (vp != dqvp) 866 VOP_UNLOCK(dqvp, 0); 867 vn_finished_write(mp, V_LOWER); 868 return (0); 869 } 870 } 871 dq->dq_flags |= DQ_LOCK; 872 auio.uio_iov = &aiov; 873 auio.uio_iovcnt = 1; 874 aiov.iov_base = (caddr_t)&dq->dq_dqb; 875 aiov.iov_len = sizeof (struct dqblk); 876 auio.uio_resid = sizeof (struct dqblk); 877 auio.uio_offset = (off_t)(dq->dq_id * sizeof (struct dqblk)); 878 auio.uio_rw = UIO_WRITE; 879 UIO_SETUP_SYSSPACE(&auio); 880 error = VOP_WRITE(dqvp, &auio, 0, dq->dq_ump->um_cred[dq->dq_type]); 881 if (auio.uio_resid && error == 0) 882 error = EIO; 883 if (dq->dq_flags & DQ_WANT) 884 wakeup((caddr_t)dq); 885 dq->dq_flags &= ~(DQ_MOD|DQ_LOCK|DQ_WANT); 886 if (vp != dqvp) 887 VOP_UNLOCK(dqvp, 0); 888 vn_finished_write(mp, V_LOWER); 889 return (error); 890 } 891 892 /* 893 * Flush all entries from the cache for a particular vnode. 894 */ 895 void 896 dqflush(struct vnode *vp) 897 { 898 struct dquot *dq, *nextdq; 899 struct dqhashhead *dqh; 900 901 /* 902 * Move all dquot's that used to refer to this quota 903 * file off their hash chains (they will eventually 904 * fall off the head of the free list and be re-used). 905 */ 906 for (dqh = &dqhashtbl[dqhash]; dqh >= dqhashtbl; dqh--) { 907 for (dq = LIST_FIRST(dqh); dq; dq = nextdq) { 908 nextdq = LIST_NEXT(dq, dq_hash); 909 if (dq->dq_ump->um_quotas[dq->dq_type] != vp) 910 continue; 911 if (dq->dq_cnt) 912 panic("dqflush: stray dquot"); 913 LIST_REMOVE(dq, dq_hash); 914 dq->dq_ump = NULL; 915 } 916 } 917 } 918
Indexes created Wed Oct 15 02:09:48 GMT 2025