ufs_quota.c revision 1.41
1 /* $NetBSD: ufs_quota.c,v 1.41 2006/07/23 22:06:15 ad 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 1.41 2006/07/23 22:06:15 ad 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 for (vp = LIST_FIRST(&mp->mnt_vnodelist); vp != NULL; vp = nextvp) { 388 nextvp = LIST_NEXT(vp, v_mntvnodes); 389 if (vp->v_type == VNON ||vp->v_writecount == 0) 390 continue; 391 if (vget(vp, LK_EXCLUSIVE)) 392 goto again; 393 if ((error = getinoquota(VTOI(vp))) != 0) { 394 vput(vp); 395 break; 396 } 397 vput(vp); 398 if (LIST_NEXT(vp, v_mntvnodes) != nextvp || vp->v_mount != mp) 399 goto again; 400 } 401 ump->um_qflags[type] &= ~QTF_OPENING; 402 if (error) 403 quotaoff(l, mp, type); 404 return (error); 405 } 406 407 /* 408 * Q_QUOTAOFF - turn off disk quotas for a filesystem. 409 */ 410 int 411 quotaoff(struct lwp *l, struct mount *mp, int type) 412 { 413 struct vnode *vp; 414 struct vnode *qvp, *nextvp; 415 struct ufsmount *ump = VFSTOUFS(mp); 416 struct dquot *dq; 417 struct inode *ip; 418 int error; 419 420 if ((qvp = ump->um_quotas[type]) == NULLVP) 421 return (0); 422 ump->um_qflags[type] |= QTF_CLOSING; 423 /* 424 * Search vnodes associated with this mount point, 425 * deleting any references to quota file being closed. 426 */ 427 again: 428 for (vp = LIST_FIRST(&mp->mnt_vnodelist); vp != NULL; vp = nextvp) { 429 nextvp = LIST_NEXT(vp, v_mntvnodes); 430 if (vp->v_type == VNON) 431 continue; 432 if (vget(vp, LK_EXCLUSIVE)) 433 goto again; 434 ip = VTOI(vp); 435 dq = ip->i_dquot[type]; 436 ip->i_dquot[type] = NODQUOT; 437 dqrele(vp, dq); 438 vput(vp); 439 if (LIST_NEXT(vp, v_mntvnodes) != nextvp || vp->v_mount != mp) 440 goto again; 441 } 442 dqflush(qvp); 443 qvp->v_flag &= ~VSYSTEM; 444 error = vn_close(qvp, FREAD|FWRITE, l->l_cred, l); 445 ump->um_quotas[type] = NULLVP; 446 kauth_cred_free(ump->um_cred[type]); 447 ump->um_cred[type] = NOCRED; 448 ump->um_qflags[type] &= ~QTF_CLOSING; 449 for (type = 0; type < MAXQUOTAS; type++) 450 if (ump->um_quotas[type] != NULLVP) 451 break; 452 if (type == MAXQUOTAS) 453 mp->mnt_flag &= ~MNT_QUOTA; 454 return (error); 455 } 456 457 /* 458 * Q_GETQUOTA - return current values in a dqblk structure. 459 */ 460 int 461 getquota(struct mount *mp, u_long id, int type, caddr_t addr) 462 { 463 struct dquot *dq; 464 int error; 465 466 if ((error = dqget(NULLVP, id, VFSTOUFS(mp), type, &dq)) != 0) 467 return (error); 468 error = copyout((caddr_t)&dq->dq_dqb, addr, sizeof (struct dqblk)); 469 dqrele(NULLVP, dq); 470 return (error); 471 } 472 473 /* 474 * Q_SETQUOTA - assign an entire dqblk structure. 475 */ 476 int 477 setquota(struct mount *mp, u_long id, int type, caddr_t addr) 478 { 479 struct dquot *dq; 480 struct dquot *ndq; 481 struct ufsmount *ump = VFSTOUFS(mp); 482 struct dqblk newlim; 483 int error; 484 485 error = copyin(addr, (caddr_t)&newlim, sizeof (struct dqblk)); 486 if (error) 487 return (error); 488 if ((error = dqget(NULLVP, id, ump, type, &ndq)) != 0) 489 return (error); 490 dq = ndq; 491 while (dq->dq_flags & DQ_LOCK) { 492 dq->dq_flags |= DQ_WANT; 493 (void) tsleep(dq, PINOD+1, "setquota", 0); 494 } 495 /* 496 * Copy all but the current values. 497 * Reset time limit if previously had no soft limit or were 498 * under it, but now have a soft limit and are over it. 499 */ 500 newlim.dqb_curblocks = dq->dq_curblocks; 501 newlim.dqb_curinodes = dq->dq_curinodes; 502 if (dq->dq_id != 0) { 503 newlim.dqb_btime = dq->dq_btime; 504 newlim.dqb_itime = dq->dq_itime; 505 } 506 if (newlim.dqb_bsoftlimit && 507 dq->dq_curblocks >= newlim.dqb_bsoftlimit && 508 (dq->dq_bsoftlimit == 0 || dq->dq_curblocks < dq->dq_bsoftlimit)) 509 newlim.dqb_btime = time_second + ump->um_btime[type]; 510 if (newlim.dqb_isoftlimit && 511 dq->dq_curinodes >= newlim.dqb_isoftlimit && 512 (dq->dq_isoftlimit == 0 || dq->dq_curinodes < dq->dq_isoftlimit)) 513 newlim.dqb_itime = time_second + ump->um_itime[type]; 514 dq->dq_dqb = newlim; 515 if (dq->dq_curblocks < dq->dq_bsoftlimit) 516 dq->dq_flags &= ~DQ_BLKS; 517 if (dq->dq_curinodes < dq->dq_isoftlimit) 518 dq->dq_flags &= ~DQ_INODS; 519 if (dq->dq_isoftlimit == 0 && dq->dq_bsoftlimit == 0 && 520 dq->dq_ihardlimit == 0 && dq->dq_bhardlimit == 0) 521 dq->dq_flags |= DQ_FAKE; 522 else 523 dq->dq_flags &= ~DQ_FAKE; 524 dq->dq_flags |= DQ_MOD; 525 dqrele(NULLVP, dq); 526 return (0); 527 } 528 529 /* 530 * Q_SETUSE - set current inode and block usage. 531 */ 532 int 533 setuse(struct mount *mp, u_long id, int type, caddr_t addr) 534 { 535 struct dquot *dq; 536 struct ufsmount *ump = VFSTOUFS(mp); 537 struct dquot *ndq; 538 struct dqblk usage; 539 int error; 540 541 error = copyin(addr, (caddr_t)&usage, sizeof (struct dqblk)); 542 if (error) 543 return (error); 544 if ((error = dqget(NULLVP, id, ump, type, &ndq)) != 0) 545 return (error); 546 dq = ndq; 547 while (dq->dq_flags & DQ_LOCK) { 548 dq->dq_flags |= DQ_WANT; 549 (void) tsleep(dq, PINOD+1, "setuse", 0); 550 } 551 /* 552 * Reset time limit if have a soft limit and were 553 * previously under it, but are now over it. 554 */ 555 if (dq->dq_bsoftlimit && dq->dq_curblocks < dq->dq_bsoftlimit && 556 usage.dqb_curblocks >= dq->dq_bsoftlimit) 557 dq->dq_btime = time_second + ump->um_btime[type]; 558 if (dq->dq_isoftlimit && dq->dq_curinodes < dq->dq_isoftlimit && 559 usage.dqb_curinodes >= dq->dq_isoftlimit) 560 dq->dq_itime = time_second + ump->um_itime[type]; 561 dq->dq_curblocks = usage.dqb_curblocks; 562 dq->dq_curinodes = usage.dqb_curinodes; 563 if (dq->dq_curblocks < dq->dq_bsoftlimit) 564 dq->dq_flags &= ~DQ_BLKS; 565 if (dq->dq_curinodes < dq->dq_isoftlimit) 566 dq->dq_flags &= ~DQ_INODS; 567 dq->dq_flags |= DQ_MOD; 568 dqrele(NULLVP, dq); 569 return (0); 570 } 571 572 /* 573 * Q_SYNC - sync quota files to disk. 574 */ 575 int 576 qsync(struct mount *mp) 577 { 578 struct ufsmount *ump = VFSTOUFS(mp); 579 struct vnode *vp, *nextvp; 580 struct dquot *dq; 581 int i, error; 582 583 /* 584 * Check if the mount point has any quotas. 585 * If not, simply return. 586 */ 587 for (i = 0; i < MAXQUOTAS; i++) 588 if (ump->um_quotas[i] != NULLVP) 589 break; 590 if (i == MAXQUOTAS) 591 return (0); 592 /* 593 * Search vnodes associated with this mount point, 594 * synchronizing any modified dquot structures. 595 */ 596 simple_lock(&mntvnode_slock); 597 again: 598 for (vp = LIST_FIRST(&mp->mnt_vnodelist); vp != NULL; vp = nextvp) { 599 if (vp->v_mount != mp) 600 goto again; 601 nextvp = LIST_NEXT(vp, v_mntvnodes); 602 if (vp->v_type == VNON) 603 continue; 604 simple_lock(&vp->v_interlock); 605 simple_unlock(&mntvnode_slock); 606 error = vget(vp, LK_EXCLUSIVE | LK_NOWAIT | LK_INTERLOCK); 607 if (error) { 608 simple_lock(&mntvnode_slock); 609 if (error == ENOENT) 610 goto again; 611 continue; 612 } 613 for (i = 0; i < MAXQUOTAS; i++) { 614 dq = VTOI(vp)->i_dquot[i]; 615 if (dq != NODQUOT && (dq->dq_flags & DQ_MOD)) 616 dqsync(vp, dq); 617 } 618 vput(vp); 619 simple_lock(&mntvnode_slock); 620 if (LIST_NEXT(vp, v_mntvnodes) != nextvp) 621 goto again; 622 } 623 simple_unlock(&mntvnode_slock); 624 return (0); 625 } 626 627 /* 628 * Code pertaining to management of the in-core dquot data structures. 629 */ 630 #define DQHASH(dqvp, id) \ 631 (((((long)(dqvp)) >> 8) + id) & dqhash) 632 static LIST_HEAD(dqhashhead, dquot) *dqhashtbl; 633 static u_long dqhash; 634 635 /* 636 * Dquot free list. 637 */ 638 #define DQUOTINC 5 /* minimum free dquots desired */ 639 static TAILQ_HEAD(dqfreelist, dquot) dqfreelist; 640 static long numdquot, desireddquot = DQUOTINC; 641 642 MALLOC_DEFINE(M_DQUOT, "UFS quota", "UFS quota entries"); 643 644 /* 645 * Initialize the quota system. 646 */ 647 void 648 dqinit(void) 649 { 650 dqhashtbl = 651 hashinit(desiredvnodes, HASH_LIST, M_DQUOT, M_WAITOK, &dqhash); 652 TAILQ_INIT(&dqfreelist); 653 } 654 655 void 656 dqreinit(void) 657 { 658 struct dquot *dq; 659 struct dqhashhead *oldhash, *hash; 660 struct vnode *dqvp; 661 u_long oldmask, mask, hashval; 662 int i; 663 664 hash = hashinit(desiredvnodes, HASH_LIST, M_DQUOT, M_WAITOK, &mask); 665 oldhash = dqhashtbl; 666 oldmask = dqhash; 667 dqhashtbl = hash; 668 dqhash = mask; 669 for (i = 0; i <= oldmask; i++) { 670 while ((dq = LIST_FIRST(&oldhash[i])) != NULL) { 671 dqvp = dq->dq_ump->um_quotas[dq->dq_type]; 672 LIST_REMOVE(dq, dq_hash); 673 hashval = DQHASH(dqvp, dq->dq_id); 674 LIST_INSERT_HEAD(&dqhashtbl[hashval], dq, dq_hash); 675 } 676 } 677 hashdone(oldhash, M_DQUOT); 678 } 679 680 /* 681 * Free resources held by quota system. 682 */ 683 void 684 dqdone(void) 685 { 686 hashdone(dqhashtbl, M_DQUOT); 687 } 688 689 /* 690 * Obtain a dquot structure for the specified identifier and quota file 691 * reading the information from the file if necessary. 692 */ 693 int 694 dqget(struct vnode *vp, u_long id, struct ufsmount *ump, int type, 695 struct dquot **dqp) 696 { 697 struct dquot *dq; 698 struct dqhashhead *dqh; 699 struct vnode *dqvp; 700 struct iovec aiov; 701 struct uio auio; 702 int error; 703 704 dqvp = ump->um_quotas[type]; 705 if (dqvp == NULLVP || (ump->um_qflags[type] & QTF_CLOSING)) { 706 *dqp = NODQUOT; 707 return (EINVAL); 708 } 709 /* 710 * Check the cache first. 711 */ 712 dqh = &dqhashtbl[DQHASH(dqvp, id)]; 713 LIST_FOREACH(dq, dqh, dq_hash) { 714 if (dq->dq_id != id || 715 dq->dq_ump->um_quotas[dq->dq_type] != dqvp) 716 continue; 717 /* 718 * Cache hit with no references. Take 719 * the structure off the free list. 720 */ 721 if (dq->dq_cnt == 0) 722 TAILQ_REMOVE(&dqfreelist, dq, dq_freelist); 723 dqref(dq); 724 *dqp = dq; 725 return (0); 726 } 727 /* 728 * Not in cache, allocate a new one. 729 */ 730 if (dqfreelist.tqh_first == NODQUOT && 731 numdquot < MAXQUOTAS * desiredvnodes) 732 desireddquot += DQUOTINC; 733 if (numdquot < desireddquot) { 734 dq = (struct dquot *)malloc(sizeof *dq, M_DQUOT, M_WAITOK); 735 memset((char *)dq, 0, sizeof *dq); 736 numdquot++; 737 } else { 738 if ((dq = dqfreelist.tqh_first) == NULL) { 739 tablefull("dquot", 740 "increase kern.maxvnodes or NVNODE"); 741 *dqp = NODQUOT; 742 return (EUSERS); 743 } 744 if (dq->dq_cnt || (dq->dq_flags & DQ_MOD)) 745 panic("free dquot isn't"); 746 TAILQ_REMOVE(&dqfreelist, dq, dq_freelist); 747 LIST_REMOVE(dq, dq_hash); 748 } 749 /* 750 * Initialize the contents of the dquot structure. 751 */ 752 if (vp != dqvp) 753 vn_lock(dqvp, LK_EXCLUSIVE | LK_RETRY); 754 LIST_INSERT_HEAD(dqh, dq, dq_hash); 755 dqref(dq); 756 dq->dq_flags = DQ_LOCK; 757 dq->dq_id = id; 758 dq->dq_ump = ump; 759 dq->dq_type = type; 760 auio.uio_iov = &aiov; 761 auio.uio_iovcnt = 1; 762 aiov.iov_base = (caddr_t)&dq->dq_dqb; 763 aiov.iov_len = sizeof (struct dqblk); 764 auio.uio_resid = sizeof (struct dqblk); 765 auio.uio_offset = (off_t)(id * sizeof (struct dqblk)); 766 auio.uio_rw = UIO_READ; 767 UIO_SETUP_SYSSPACE(&auio); 768 error = VOP_READ(dqvp, &auio, 0, ump->um_cred[type]); 769 if (auio.uio_resid == sizeof(struct dqblk) && error == 0) 770 memset((caddr_t)&dq->dq_dqb, 0, sizeof(struct dqblk)); 771 if (vp != dqvp) 772 VOP_UNLOCK(dqvp, 0); 773 if (dq->dq_flags & DQ_WANT) 774 wakeup((caddr_t)dq); 775 dq->dq_flags = 0; 776 /* 777 * I/O error in reading quota file, release 778 * quota structure and reflect problem to caller. 779 */ 780 if (error) { 781 LIST_REMOVE(dq, dq_hash); 782 dqrele(vp, dq); 783 *dqp = NODQUOT; 784 return (error); 785 } 786 /* 787 * Check for no limit to enforce. 788 * Initialize time values if necessary. 789 */ 790 if (dq->dq_isoftlimit == 0 && dq->dq_bsoftlimit == 0 && 791 dq->dq_ihardlimit == 0 && dq->dq_bhardlimit == 0) 792 dq->dq_flags |= DQ_FAKE; 793 if (dq->dq_id != 0) { 794 if (dq->dq_btime == 0) 795 dq->dq_btime = time_second + ump->um_btime[type]; 796 if (dq->dq_itime == 0) 797 dq->dq_itime = time_second + ump->um_itime[type]; 798 } 799 *dqp = dq; 800 return (0); 801 } 802 803 /* 804 * Obtain a reference to a dquot. 805 */ 806 void 807 dqref(struct dquot *dq) 808 { 809 810 dq->dq_cnt++; 811 } 812 813 /* 814 * Release a reference to a dquot. 815 */ 816 void 817 dqrele(struct vnode *vp, struct dquot *dq) 818 { 819 820 if (dq == NODQUOT) 821 return; 822 if (dq->dq_cnt > 1) { 823 dq->dq_cnt--; 824 return; 825 } 826 if (dq->dq_flags & DQ_MOD) 827 (void) dqsync(vp, dq); 828 if (--dq->dq_cnt > 0) 829 return; 830 TAILQ_INSERT_TAIL(&dqfreelist, dq, dq_freelist); 831 } 832 833 /* 834 * Update the disk quota in the quota file. 835 */ 836 int 837 dqsync(struct vnode *vp, struct dquot *dq) 838 { 839 struct vnode *dqvp; 840 struct mount *mp; 841 struct iovec aiov; 842 struct uio auio; 843 int error; 844 845 if (dq == NODQUOT) 846 panic("dqsync: dquot"); 847 if ((dq->dq_flags & DQ_MOD) == 0) 848 return (0); 849 if ((dqvp = dq->dq_ump->um_quotas[dq->dq_type]) == NULLVP) 850 panic("dqsync: file"); 851 vn_start_write(dqvp, &mp, V_WAIT | V_LOWER); 852 if (vp != dqvp) 853 vn_lock(dqvp, LK_EXCLUSIVE | LK_RETRY); 854 while (dq->dq_flags & DQ_LOCK) { 855 dq->dq_flags |= DQ_WANT; 856 (void) tsleep(dq, PINOD+2, "dqsync", 0); 857 if ((dq->dq_flags & DQ_MOD) == 0) { 858 if (vp != dqvp) 859 VOP_UNLOCK(dqvp, 0); 860 vn_finished_write(mp, V_LOWER); 861 return (0); 862 } 863 } 864 dq->dq_flags |= DQ_LOCK; 865 auio.uio_iov = &aiov; 866 auio.uio_iovcnt = 1; 867 aiov.iov_base = (caddr_t)&dq->dq_dqb; 868 aiov.iov_len = sizeof (struct dqblk); 869 auio.uio_resid = sizeof (struct dqblk); 870 auio.uio_offset = (off_t)(dq->dq_id * sizeof (struct dqblk)); 871 auio.uio_rw = UIO_WRITE; 872 UIO_SETUP_SYSSPACE(&auio); 873 error = VOP_WRITE(dqvp, &auio, 0, dq->dq_ump->um_cred[dq->dq_type]); 874 if (auio.uio_resid && error == 0) 875 error = EIO; 876 if (dq->dq_flags & DQ_WANT) 877 wakeup((caddr_t)dq); 878 dq->dq_flags &= ~(DQ_MOD|DQ_LOCK|DQ_WANT); 879 if (vp != dqvp) 880 VOP_UNLOCK(dqvp, 0); 881 vn_finished_write(mp, V_LOWER); 882 return (error); 883 } 884 885 /* 886 * Flush all entries from the cache for a particular vnode. 887 */ 888 void 889 dqflush(struct vnode *vp) 890 { 891 struct dquot *dq, *nextdq; 892 struct dqhashhead *dqh; 893 894 /* 895 * Move all dquot's that used to refer to this quota 896 * file off their hash chains (they will eventually 897 * fall off the head of the free list and be re-used). 898 */ 899 for (dqh = &dqhashtbl[dqhash]; dqh >= dqhashtbl; dqh--) { 900 for (dq = LIST_FIRST(dqh); dq; dq = nextdq) { 901 nextdq = LIST_NEXT(dq, dq_hash); 902 if (dq->dq_ump->um_quotas[dq->dq_type] != vp) 903 continue; 904 if (dq->dq_cnt) 905 panic("dqflush: stray dquot"); 906 LIST_REMOVE(dq, dq_hash); 907 dq->dq_ump = NULL; 908 } 909 } 910 } 911
Indexes created Fri Oct 03 02:09:57 GMT 2025