ufs_quota.c revision 1.43
1 /* $NetBSD: ufs_quota.c,v 1.43 2007/01/04 16:55:30 elad 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 1.43 2007/01/04 16:55:30 elad 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 kauth_authorize_generic(cred, KAUTH_GENERIC_ISSUSER, NULL) != 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_authorize_generic(cred, 239 KAUTH_GENERIC_ISSUSER, NULL) != 0) { 240 for (i = 0; i < MAXQUOTAS; i++) { 241 if ((dq = ip->i_dquot[i]) == NODQUOT) 242 continue; 243 if ((error = chkiqchg(ip, change, cred, i)) != 0) 244 return (error); 245 } 246 } 247 for (i = 0; i < MAXQUOTAS; i++) { 248 if ((dq = ip->i_dquot[i]) == NODQUOT) 249 continue; 250 while (dq->dq_flags & DQ_LOCK) { 251 dq->dq_flags |= DQ_WANT; 252 (void) tsleep(dq, PINOD+1, "chkiq", 0); 253 } 254 dq->dq_curinodes += change; 255 dq->dq_flags |= DQ_MOD; 256 } 257 return (0); 258 } 259 260 /* 261 * Check for a valid change to a users allocation. 262 * Issue an error message if appropriate. 263 */ 264 int 265 chkiqchg(struct inode *ip, int32_t change, kauth_cred_t cred, int type) 266 { 267 struct dquot *dq = ip->i_dquot[type]; 268 long ncurinodes = dq->dq_curinodes + change; 269 270 /* 271 * If user would exceed their hard limit, disallow inode allocation. 272 */ 273 if (ncurinodes >= dq->dq_ihardlimit && dq->dq_ihardlimit) { 274 if ((dq->dq_flags & DQ_INODS) == 0 && 275 ip->i_uid == kauth_cred_geteuid(cred)) { 276 uprintf("\n%s: write failed, %s inode limit reached\n", 277 ITOV(ip)->v_mount->mnt_stat.f_mntonname, 278 quotatypes[type]); 279 dq->dq_flags |= DQ_INODS; 280 } 281 return (EDQUOT); 282 } 283 /* 284 * If user is over their soft limit for too long, disallow inode 285 * allocation. Reset time limit as they cross their soft limit. 286 */ 287 if (ncurinodes >= dq->dq_isoftlimit && dq->dq_isoftlimit) { 288 if (dq->dq_curinodes < dq->dq_isoftlimit) { 289 dq->dq_itime = time_second + ip->i_ump->um_itime[type]; 290 if (ip->i_uid == kauth_cred_geteuid(cred)) 291 uprintf("\n%s: warning, %s %s\n", 292 ITOV(ip)->v_mount->mnt_stat.f_mntonname, 293 quotatypes[type], "inode quota exceeded"); 294 return (0); 295 } 296 if (time_second > dq->dq_itime) { 297 if ((dq->dq_flags & DQ_INODS) == 0 && 298 ip->i_uid == kauth_cred_geteuid(cred)) { 299 uprintf("\n%s: write failed, %s %s\n", 300 ITOV(ip)->v_mount->mnt_stat.f_mntonname, 301 quotatypes[type], 302 "inode quota exceeded for too long"); 303 dq->dq_flags |= DQ_INODS; 304 } 305 return (EDQUOT); 306 } 307 } 308 return (0); 309 } 310 311 #ifdef DIAGNOSTIC 312 /* 313 * On filesystems with quotas enabled, it is an error for a file to change 314 * size and not to have a dquot structure associated with it. 315 */ 316 void 317 chkdquot(struct inode *ip) 318 { 319 struct ufsmount *ump = ip->i_ump; 320 int i; 321 322 for (i = 0; i < MAXQUOTAS; i++) { 323 if (ump->um_quotas[i] == NULLVP || 324 (ump->um_qflags[i] & (QTF_OPENING|QTF_CLOSING))) 325 continue; 326 if (ip->i_dquot[i] == NODQUOT) { 327 vprint("chkdquot: missing dquot", ITOV(ip)); 328 panic("missing dquot"); 329 } 330 } 331 } 332 #endif 333 334 /* 335 * Code to process quotactl commands. 336 */ 337 338 /* 339 * Q_QUOTAON - set up a quota file for a particular file system. 340 */ 341 int 342 quotaon(struct lwp *l, struct mount *mp, int type, caddr_t fname) 343 { 344 struct ufsmount *ump = VFSTOUFS(mp); 345 struct vnode *vp, **vpp; 346 struct vnode *nextvp; 347 struct dquot *dq; 348 int error; 349 struct nameidata nd; 350 351 vpp = &ump->um_quotas[type]; 352 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, fname, l); 353 if ((error = vn_open(&nd, FREAD|FWRITE, 0)) != 0) 354 return (error); 355 vp = nd.ni_vp; 356 VOP_UNLOCK(vp, 0); 357 if (vp->v_type != VREG) { 358 (void) vn_close(vp, FREAD|FWRITE, l->l_cred, l); 359 return (EACCES); 360 } 361 if (*vpp != vp) 362 quotaoff(l, mp, type); 363 ump->um_qflags[type] |= QTF_OPENING; 364 mp->mnt_flag |= MNT_QUOTA; 365 vp->v_flag |= VSYSTEM; 366 *vpp = vp; 367 /* 368 * Save the credential of the process that turned on quotas. 369 * Set up the time limits for this quota. 370 */ 371 kauth_cred_hold(l->l_cred); 372 ump->um_cred[type] = l->l_cred; 373 ump->um_btime[type] = MAX_DQ_TIME; 374 ump->um_itime[type] = MAX_IQ_TIME; 375 if (dqget(NULLVP, 0, ump, type, &dq) == 0) { 376 if (dq->dq_btime > 0) 377 ump->um_btime[type] = dq->dq_btime; 378 if (dq->dq_itime > 0) 379 ump->um_itime[type] = dq->dq_itime; 380 dqrele(NULLVP, dq); 381 } 382 /* 383 * Search vnodes associated with this mount point, 384 * adding references to quota file being opened. 385 * NB: only need to add dquot's for inodes being modified. 386 */ 387 again: 388 TAILQ_FOREACH(vp, &mp->mnt_vnodelist, v_mntvnodes) { 389 nextvp = TAILQ_NEXT(vp, v_mntvnodes); 390 if (vp->v_mount != mp) 391 goto again; 392 if (vp->v_type == VNON ||vp->v_writecount == 0) 393 continue; 394 if (vget(vp, LK_EXCLUSIVE)) 395 goto again; 396 if ((error = getinoquota(VTOI(vp))) != 0) { 397 vput(vp); 398 break; 399 } 400 vput(vp); 401 /* if the list changed, start again */ 402 if (TAILQ_NEXT(vp, v_mntvnodes) != nextvp) 403 goto again; 404 } 405 ump->um_qflags[type] &= ~QTF_OPENING; 406 if (error) 407 quotaoff(l, mp, type); 408 return (error); 409 } 410 411 /* 412 * Q_QUOTAOFF - turn off disk quotas for a filesystem. 413 */ 414 int 415 quotaoff(struct lwp *l, struct mount *mp, int type) 416 { 417 struct vnode *vp; 418 struct vnode *qvp, *nextvp; 419 struct ufsmount *ump = VFSTOUFS(mp); 420 struct dquot *dq; 421 struct inode *ip; 422 int error; 423 424 if ((qvp = ump->um_quotas[type]) == NULLVP) 425 return (0); 426 ump->um_qflags[type] |= QTF_CLOSING; 427 /* 428 * Search vnodes associated with this mount point, 429 * deleting any references to quota file being closed. 430 */ 431 again: 432 TAILQ_FOREACH(vp, &mp->mnt_vnodelist, v_mntvnodes) { 433 nextvp = TAILQ_NEXT(vp, v_mntvnodes); 434 if (vp->v_mount != mp) 435 goto again; 436 if (vp->v_type == VNON) 437 continue; 438 if (vget(vp, LK_EXCLUSIVE)) 439 goto again; 440 ip = VTOI(vp); 441 dq = ip->i_dquot[type]; 442 ip->i_dquot[type] = NODQUOT; 443 dqrele(vp, dq); 444 vput(vp); 445 /* if the list changed, start again */ 446 if (TAILQ_NEXT(vp, v_mntvnodes) != nextvp) 447 goto again; 448 } 449 dqflush(qvp); 450 qvp->v_flag &= ~VSYSTEM; 451 error = vn_close(qvp, FREAD|FWRITE, l->l_cred, l); 452 ump->um_quotas[type] = NULLVP; 453 kauth_cred_free(ump->um_cred[type]); 454 ump->um_cred[type] = NOCRED; 455 ump->um_qflags[type] &= ~QTF_CLOSING; 456 for (type = 0; type < MAXQUOTAS; type++) 457 if (ump->um_quotas[type] != NULLVP) 458 break; 459 if (type == MAXQUOTAS) 460 mp->mnt_flag &= ~MNT_QUOTA; 461 return (error); 462 } 463 464 /* 465 * Q_GETQUOTA - return current values in a dqblk structure. 466 */ 467 int 468 getquota(struct mount *mp, u_long id, int type, caddr_t addr) 469 { 470 struct dquot *dq; 471 int error; 472 473 if ((error = dqget(NULLVP, id, VFSTOUFS(mp), type, &dq)) != 0) 474 return (error); 475 error = copyout((caddr_t)&dq->dq_dqb, addr, sizeof (struct dqblk)); 476 dqrele(NULLVP, dq); 477 return (error); 478 } 479 480 /* 481 * Q_SETQUOTA - assign an entire dqblk structure. 482 */ 483 int 484 setquota(struct mount *mp, u_long id, int type, caddr_t addr) 485 { 486 struct dquot *dq; 487 struct dquot *ndq; 488 struct ufsmount *ump = VFSTOUFS(mp); 489 struct dqblk newlim; 490 int error; 491 492 error = copyin(addr, (caddr_t)&newlim, sizeof (struct dqblk)); 493 if (error) 494 return (error); 495 if ((error = dqget(NULLVP, id, ump, type, &ndq)) != 0) 496 return (error); 497 dq = ndq; 498 while (dq->dq_flags & DQ_LOCK) { 499 dq->dq_flags |= DQ_WANT; 500 (void) tsleep(dq, PINOD+1, "setquota", 0); 501 } 502 /* 503 * Copy all but the current values. 504 * Reset time limit if previously had no soft limit or were 505 * under it, but now have a soft limit and are over it. 506 */ 507 newlim.dqb_curblocks = dq->dq_curblocks; 508 newlim.dqb_curinodes = dq->dq_curinodes; 509 if (dq->dq_id != 0) { 510 newlim.dqb_btime = dq->dq_btime; 511 newlim.dqb_itime = dq->dq_itime; 512 } 513 if (newlim.dqb_bsoftlimit && 514 dq->dq_curblocks >= newlim.dqb_bsoftlimit && 515 (dq->dq_bsoftlimit == 0 || dq->dq_curblocks < dq->dq_bsoftlimit)) 516 newlim.dqb_btime = time_second + ump->um_btime[type]; 517 if (newlim.dqb_isoftlimit && 518 dq->dq_curinodes >= newlim.dqb_isoftlimit && 519 (dq->dq_isoftlimit == 0 || dq->dq_curinodes < dq->dq_isoftlimit)) 520 newlim.dqb_itime = time_second + ump->um_itime[type]; 521 dq->dq_dqb = newlim; 522 if (dq->dq_curblocks < dq->dq_bsoftlimit) 523 dq->dq_flags &= ~DQ_BLKS; 524 if (dq->dq_curinodes < dq->dq_isoftlimit) 525 dq->dq_flags &= ~DQ_INODS; 526 if (dq->dq_isoftlimit == 0 && dq->dq_bsoftlimit == 0 && 527 dq->dq_ihardlimit == 0 && dq->dq_bhardlimit == 0) 528 dq->dq_flags |= DQ_FAKE; 529 else 530 dq->dq_flags &= ~DQ_FAKE; 531 dq->dq_flags |= DQ_MOD; 532 dqrele(NULLVP, dq); 533 return (0); 534 } 535 536 /* 537 * Q_SETUSE - set current inode and block usage. 538 */ 539 int 540 setuse(struct mount *mp, u_long id, int type, caddr_t addr) 541 { 542 struct dquot *dq; 543 struct ufsmount *ump = VFSTOUFS(mp); 544 struct dquot *ndq; 545 struct dqblk usage; 546 int error; 547 548 error = copyin(addr, (caddr_t)&usage, sizeof (struct dqblk)); 549 if (error) 550 return (error); 551 if ((error = dqget(NULLVP, id, ump, type, &ndq)) != 0) 552 return (error); 553 dq = ndq; 554 while (dq->dq_flags & DQ_LOCK) { 555 dq->dq_flags |= DQ_WANT; 556 (void) tsleep(dq, PINOD+1, "setuse", 0); 557 } 558 /* 559 * Reset time limit if have a soft limit and were 560 * previously under it, but are now over it. 561 */ 562 if (dq->dq_bsoftlimit && dq->dq_curblocks < dq->dq_bsoftlimit && 563 usage.dqb_curblocks >= dq->dq_bsoftlimit) 564 dq->dq_btime = time_second + ump->um_btime[type]; 565 if (dq->dq_isoftlimit && dq->dq_curinodes < dq->dq_isoftlimit && 566 usage.dqb_curinodes >= dq->dq_isoftlimit) 567 dq->dq_itime = time_second + ump->um_itime[type]; 568 dq->dq_curblocks = usage.dqb_curblocks; 569 dq->dq_curinodes = usage.dqb_curinodes; 570 if (dq->dq_curblocks < dq->dq_bsoftlimit) 571 dq->dq_flags &= ~DQ_BLKS; 572 if (dq->dq_curinodes < dq->dq_isoftlimit) 573 dq->dq_flags &= ~DQ_INODS; 574 dq->dq_flags |= DQ_MOD; 575 dqrele(NULLVP, dq); 576 return (0); 577 } 578 579 /* 580 * Q_SYNC - sync quota files to disk. 581 */ 582 int 583 qsync(struct mount *mp) 584 { 585 struct ufsmount *ump = VFSTOUFS(mp); 586 struct vnode *vp, *nextvp; 587 struct dquot *dq; 588 int i, error; 589 590 /* 591 * Check if the mount point has any quotas. 592 * If not, simply return. 593 */ 594 for (i = 0; i < MAXQUOTAS; i++) 595 if (ump->um_quotas[i] != NULLVP) 596 break; 597 if (i == MAXQUOTAS) 598 return (0); 599 /* 600 * Search vnodes associated with this mount point, 601 * synchronizing any modified dquot structures. 602 */ 603 simple_lock(&mntvnode_slock); 604 again: 605 TAILQ_FOREACH(vp, &mp->mnt_vnodelist, v_mntvnodes) { 606 nextvp = TAILQ_NEXT(vp, v_mntvnodes); 607 if (vp->v_mount != mp) 608 goto again; 609 if (vp->v_type == VNON) 610 continue; 611 simple_lock(&vp->v_interlock); 612 simple_unlock(&mntvnode_slock); 613 error = vget(vp, LK_EXCLUSIVE | LK_NOWAIT | LK_INTERLOCK); 614 if (error) { 615 simple_lock(&mntvnode_slock); 616 if (error == ENOENT) 617 goto again; 618 continue; 619 } 620 for (i = 0; i < MAXQUOTAS; i++) { 621 dq = VTOI(vp)->i_dquot[i]; 622 if (dq != NODQUOT && (dq->dq_flags & DQ_MOD)) 623 dqsync(vp, dq); 624 } 625 vput(vp); 626 simple_lock(&mntvnode_slock); 627 /* if the list changed, start again */ 628 if (TAILQ_NEXT(vp, v_mntvnodes) != nextvp) 629 goto again; 630 } 631 simple_unlock(&mntvnode_slock); 632 return (0); 633 } 634 635 /* 636 * Code pertaining to management of the in-core dquot data structures. 637 */ 638 #define DQHASH(dqvp, id) \ 639 (((((long)(dqvp)) >> 8) + id) & dqhash) 640 static LIST_HEAD(dqhashhead, dquot) *dqhashtbl; 641 static u_long dqhash; 642 643 /* 644 * Dquot free list. 645 */ 646 #define DQUOTINC 5 /* minimum free dquots desired */ 647 static TAILQ_HEAD(dqfreelist, dquot) dqfreelist; 648 static long numdquot, desireddquot = DQUOTINC; 649 650 MALLOC_DEFINE(M_DQUOT, "UFS quota", "UFS quota entries"); 651 652 /* 653 * Initialize the quota system. 654 */ 655 void 656 dqinit(void) 657 { 658 dqhashtbl = 659 hashinit(desiredvnodes, HASH_LIST, M_DQUOT, M_WAITOK, &dqhash); 660 TAILQ_INIT(&dqfreelist); 661 } 662 663 void 664 dqreinit(void) 665 { 666 struct dquot *dq; 667 struct dqhashhead *oldhash, *hash; 668 struct vnode *dqvp; 669 u_long oldmask, mask, hashval; 670 int i; 671 672 hash = hashinit(desiredvnodes, HASH_LIST, M_DQUOT, M_WAITOK, &mask); 673 oldhash = dqhashtbl; 674 oldmask = dqhash; 675 dqhashtbl = hash; 676 dqhash = mask; 677 for (i = 0; i <= oldmask; i++) { 678 while ((dq = LIST_FIRST(&oldhash[i])) != NULL) { 679 dqvp = dq->dq_ump->um_quotas[dq->dq_type]; 680 LIST_REMOVE(dq, dq_hash); 681 hashval = DQHASH(dqvp, dq->dq_id); 682 LIST_INSERT_HEAD(&dqhashtbl[hashval], dq, dq_hash); 683 } 684 } 685 hashdone(oldhash, M_DQUOT); 686 } 687 688 /* 689 * Free resources held by quota system. 690 */ 691 void 692 dqdone(void) 693 { 694 hashdone(dqhashtbl, M_DQUOT); 695 } 696 697 /* 698 * Obtain a dquot structure for the specified identifier and quota file 699 * reading the information from the file if necessary. 700 */ 701 int 702 dqget(struct vnode *vp, u_long id, struct ufsmount *ump, int type, 703 struct dquot **dqp) 704 { 705 struct dquot *dq; 706 struct dqhashhead *dqh; 707 struct vnode *dqvp; 708 struct iovec aiov; 709 struct uio auio; 710 int error; 711 712 dqvp = ump->um_quotas[type]; 713 if (dqvp == NULLVP || (ump->um_qflags[type] & QTF_CLOSING)) { 714 *dqp = NODQUOT; 715 return (EINVAL); 716 } 717 /* 718 * Check the cache first. 719 */ 720 dqh = &dqhashtbl[DQHASH(dqvp, id)]; 721 LIST_FOREACH(dq, dqh, dq_hash) { 722 if (dq->dq_id != id || 723 dq->dq_ump->um_quotas[dq->dq_type] != dqvp) 724 continue; 725 /* 726 * Cache hit with no references. Take 727 * the structure off the free list. 728 */ 729 if (dq->dq_cnt == 0) 730 TAILQ_REMOVE(&dqfreelist, dq, dq_freelist); 731 dqref(dq); 732 *dqp = dq; 733 return (0); 734 } 735 /* 736 * Not in cache, allocate a new one. 737 */ 738 if (dqfreelist.tqh_first == NODQUOT && 739 numdquot < MAXQUOTAS * desiredvnodes) 740 desireddquot += DQUOTINC; 741 if (numdquot < desireddquot) { 742 dq = (struct dquot *)malloc(sizeof *dq, M_DQUOT, M_WAITOK); 743 memset((char *)dq, 0, sizeof *dq); 744 numdquot++; 745 } else { 746 if ((dq = dqfreelist.tqh_first) == NULL) { 747 tablefull("dquot", 748 "increase kern.maxvnodes or NVNODE"); 749 *dqp = NODQUOT; 750 return (EUSERS); 751 } 752 if (dq->dq_cnt || (dq->dq_flags & DQ_MOD)) 753 panic("free dquot isn't"); 754 TAILQ_REMOVE(&dqfreelist, dq, dq_freelist); 755 LIST_REMOVE(dq, dq_hash); 756 } 757 /* 758 * Initialize the contents of the dquot structure. 759 */ 760 if (vp != dqvp) 761 vn_lock(dqvp, LK_EXCLUSIVE | LK_RETRY); 762 LIST_INSERT_HEAD(dqh, dq, dq_hash); 763 dqref(dq); 764 dq->dq_flags = DQ_LOCK; 765 dq->dq_id = id; 766 dq->dq_ump = ump; 767 dq->dq_type = type; 768 auio.uio_iov = &aiov; 769 auio.uio_iovcnt = 1; 770 aiov.iov_base = (caddr_t)&dq->dq_dqb; 771 aiov.iov_len = sizeof (struct dqblk); 772 auio.uio_resid = sizeof (struct dqblk); 773 auio.uio_offset = (off_t)(id * sizeof (struct dqblk)); 774 auio.uio_rw = UIO_READ; 775 UIO_SETUP_SYSSPACE(&auio); 776 error = VOP_READ(dqvp, &auio, 0, ump->um_cred[type]); 777 if (auio.uio_resid == sizeof(struct dqblk) && error == 0) 778 memset((caddr_t)&dq->dq_dqb, 0, sizeof(struct dqblk)); 779 if (vp != dqvp) 780 VOP_UNLOCK(dqvp, 0); 781 if (dq->dq_flags & DQ_WANT) 782 wakeup((caddr_t)dq); 783 dq->dq_flags = 0; 784 /* 785 * I/O error in reading quota file, release 786 * quota structure and reflect problem to caller. 787 */ 788 if (error) { 789 LIST_REMOVE(dq, dq_hash); 790 dqrele(vp, dq); 791 *dqp = NODQUOT; 792 return (error); 793 } 794 /* 795 * Check for no limit to enforce. 796 * Initialize time values if necessary. 797 */ 798 if (dq->dq_isoftlimit == 0 && dq->dq_bsoftlimit == 0 && 799 dq->dq_ihardlimit == 0 && dq->dq_bhardlimit == 0) 800 dq->dq_flags |= DQ_FAKE; 801 if (dq->dq_id != 0) { 802 if (dq->dq_btime == 0) 803 dq->dq_btime = time_second + ump->um_btime[type]; 804 if (dq->dq_itime == 0) 805 dq->dq_itime = time_second + ump->um_itime[type]; 806 } 807 *dqp = dq; 808 return (0); 809 } 810 811 /* 812 * Obtain a reference to a dquot. 813 */ 814 void 815 dqref(struct dquot *dq) 816 { 817 818 dq->dq_cnt++; 819 } 820 821 /* 822 * Release a reference to a dquot. 823 */ 824 void 825 dqrele(struct vnode *vp, struct dquot *dq) 826 { 827 828 if (dq == NODQUOT) 829 return; 830 if (dq->dq_cnt > 1) { 831 dq->dq_cnt--; 832 return; 833 } 834 if (dq->dq_flags & DQ_MOD) 835 (void) dqsync(vp, dq); 836 if (--dq->dq_cnt > 0) 837 return; 838 TAILQ_INSERT_TAIL(&dqfreelist, dq, dq_freelist); 839 } 840 841 /* 842 * Update the disk quota in the quota file. 843 */ 844 int 845 dqsync(struct vnode *vp, struct dquot *dq) 846 { 847 struct vnode *dqvp; 848 struct mount *mp; 849 struct iovec aiov; 850 struct uio auio; 851 int error; 852 853 if (dq == NODQUOT) 854 panic("dqsync: dquot"); 855 if ((dq->dq_flags & DQ_MOD) == 0) 856 return (0); 857 if ((dqvp = dq->dq_ump->um_quotas[dq->dq_type]) == NULLVP) 858 panic("dqsync: file"); 859 vn_start_write(dqvp, &mp, V_WAIT | V_LOWER); 860 if (vp != dqvp) 861 vn_lock(dqvp, LK_EXCLUSIVE | LK_RETRY); 862 while (dq->dq_flags & DQ_LOCK) { 863 dq->dq_flags |= DQ_WANT; 864 (void) tsleep(dq, PINOD+2, "dqsync", 0); 865 if ((dq->dq_flags & DQ_MOD) == 0) { 866 if (vp != dqvp) 867 VOP_UNLOCK(dqvp, 0); 868 vn_finished_write(mp, V_LOWER); 869 return (0); 870 } 871 } 872 dq->dq_flags |= DQ_LOCK; 873 auio.uio_iov = &aiov; 874 auio.uio_iovcnt = 1; 875 aiov.iov_base = (caddr_t)&dq->dq_dqb; 876 aiov.iov_len = sizeof (struct dqblk); 877 auio.uio_resid = sizeof (struct dqblk); 878 auio.uio_offset = (off_t)(dq->dq_id * sizeof (struct dqblk)); 879 auio.uio_rw = UIO_WRITE; 880 UIO_SETUP_SYSSPACE(&auio); 881 error = VOP_WRITE(dqvp, &auio, 0, dq->dq_ump->um_cred[dq->dq_type]); 882 if (auio.uio_resid && error == 0) 883 error = EIO; 884 if (dq->dq_flags & DQ_WANT) 885 wakeup((caddr_t)dq); 886 dq->dq_flags &= ~(DQ_MOD|DQ_LOCK|DQ_WANT); 887 if (vp != dqvp) 888 VOP_UNLOCK(dqvp, 0); 889 vn_finished_write(mp, V_LOWER); 890 return (error); 891 } 892 893 /* 894 * Flush all entries from the cache for a particular vnode. 895 */ 896 void 897 dqflush(struct vnode *vp) 898 { 899 struct dquot *dq, *nextdq; 900 struct dqhashhead *dqh; 901 902 /* 903 * Move all dquot's that used to refer to this quota 904 * file off their hash chains (they will eventually 905 * fall off the head of the free list and be re-used). 906 */ 907 for (dqh = &dqhashtbl[dqhash]; dqh >= dqhashtbl; dqh--) { 908 for (dq = LIST_FIRST(dqh); dq; dq = nextdq) { 909 nextdq = LIST_NEXT(dq, dq_hash); 910 if (dq->dq_ump->um_quotas[dq->dq_type] != vp) 911 continue; 912 if (dq->dq_cnt) 913 panic("dqflush: stray dquot"); 914 LIST_REMOVE(dq, dq_hash); 915 dq->dq_ump = NULL; 916 } 917 } 918 } 919
Indexes created Mon Oct 13 16:09:52 GMT 2025