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sys/ufs/ufs/ufs_quota.c
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1 /* $NetBSD: ufs_quota.c,v 1.30 2003/11/05 10:18:38 hannken 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 1.30 2003/11/05 10:18:38 hannken 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 50 #include <ufs/ufs/quota.h> 51 #include <ufs/ufs/inode.h> 52 #include <ufs/ufs/ufsmount.h> 53 #include <ufs/ufs/ufs_extern.h> 54 55 /* 56 * Quota name to error message mapping. 57 */ 58 static char *quotatypes[] = INITQFNAMES; 59 60 /* 61 * Set up the quotas for an inode. 62 * 63 * This routine completely defines the semantics of quotas. 64 * If other criterion want to be used to establish quotas, the 65 * MAXQUOTAS value in quotas.h should be increased, and the 66 * additional dquots set up here. 67 */ 68 int 69 getinoquota(ip) 70 struct inode *ip; 71 { 72 struct ufsmount *ump; 73 struct vnode *vp = ITOV(ip); 74 int error; 75 76 ump = VFSTOUFS(vp->v_mount); 77 /* 78 * Set up the user quota based on file uid. 79 * EINVAL means that quotas are not enabled. 80 */ 81 if (ip->i_dquot[USRQUOTA] == NODQUOT && 82 (error = 83 dqget(vp, ip->i_uid, ump, USRQUOTA, &ip->i_dquot[USRQUOTA])) && 84 error != EINVAL) 85 return (error); 86 /* 87 * Set up the group quota based on file gid. 88 * EINVAL means that quotas are not enabled. 89 */ 90 if (ip->i_dquot[GRPQUOTA] == NODQUOT && 91 (error = 92 dqget(vp, ip->i_gid, ump, GRPQUOTA, &ip->i_dquot[GRPQUOTA])) && 93 error != EINVAL) 94 return (error); 95 return (0); 96 } 97 98 /* 99 * Update disk usage, and take corrective action. 100 */ 101 int 102 chkdq(ip, change, cred, flags) 103 struct inode *ip; 104 int64_t change; 105 struct ucred *cred; 106 int flags; 107 { 108 struct dquot *dq; 109 int i; 110 int ncurblocks, error; 111 112 #ifdef DIAGNOSTIC 113 if ((flags & CHOWN) == 0) 114 chkdquot(ip); 115 #endif 116 if (change == 0) 117 return (0); 118 if (change < 0) { 119 for (i = 0; i < MAXQUOTAS; i++) { 120 if ((dq = ip->i_dquot[i]) == NODQUOT) 121 continue; 122 while (dq->dq_flags & DQ_LOCK) { 123 dq->dq_flags |= DQ_WANT; 124 (void) tsleep(dq, PINOD+1, "chkdq", 0); 125 } 126 ncurblocks = dq->dq_curblocks + change; 127 if (ncurblocks >= 0) 128 dq->dq_curblocks = ncurblocks; 129 else 130 dq->dq_curblocks = 0; 131 dq->dq_flags &= ~DQ_BLKS; 132 dq->dq_flags |= DQ_MOD; 133 } 134 return (0); 135 } 136 if ((flags & FORCE) == 0 && 137 (cred != NOCRED && cred->cr_uid != 0)) { 138 for (i = 0; i < MAXQUOTAS; i++) { 139 if ((dq = ip->i_dquot[i]) == NODQUOT) 140 continue; 141 if ((error = chkdqchg(ip, change, cred, i)) != 0) 142 return (error); 143 } 144 } 145 for (i = 0; i < MAXQUOTAS; i++) { 146 if ((dq = ip->i_dquot[i]) == NODQUOT) 147 continue; 148 while (dq->dq_flags & DQ_LOCK) { 149 dq->dq_flags |= DQ_WANT; 150 (void) tsleep(dq, PINOD+1, "chkdq", 0); 151 } 152 dq->dq_curblocks += change; 153 dq->dq_flags |= DQ_MOD; 154 } 155 return (0); 156 } 157 158 /* 159 * Check for a valid change to a users allocation. 160 * Issue an error message if appropriate. 161 */ 162 int 163 chkdqchg(ip, change, cred, type) 164 struct inode *ip; 165 int64_t change; 166 struct ucred *cred; 167 int type; 168 { 169 struct dquot *dq = ip->i_dquot[type]; 170 long ncurblocks = dq->dq_curblocks + change; 171 172 /* 173 * If user would exceed their hard limit, disallow space allocation. 174 */ 175 if (ncurblocks >= dq->dq_bhardlimit && dq->dq_bhardlimit) { 176 if ((dq->dq_flags & DQ_BLKS) == 0 && 177 ip->i_uid == cred->cr_uid) { 178 uprintf("\n%s: write failed, %s disk limit reached\n", 179 ITOV(ip)->v_mount->mnt_stat.f_mntonname, 180 quotatypes[type]); 181 dq->dq_flags |= DQ_BLKS; 182 } 183 return (EDQUOT); 184 } 185 /* 186 * If user is over their soft limit for too long, disallow space 187 * allocation. Reset time limit as they cross their soft limit. 188 */ 189 if (ncurblocks >= dq->dq_bsoftlimit && dq->dq_bsoftlimit) { 190 if (dq->dq_curblocks < dq->dq_bsoftlimit) { 191 dq->dq_btime = time.tv_sec + 192 VFSTOUFS(ITOV(ip)->v_mount)->um_btime[type]; 193 if (ip->i_uid == cred->cr_uid) 194 uprintf("\n%s: warning, %s %s\n", 195 ITOV(ip)->v_mount->mnt_stat.f_mntonname, 196 quotatypes[type], "disk quota exceeded"); 197 return (0); 198 } 199 if (time.tv_sec > dq->dq_btime) { 200 if ((dq->dq_flags & DQ_BLKS) == 0 && 201 ip->i_uid == cred->cr_uid) { 202 uprintf("\n%s: write failed, %s %s\n", 203 ITOV(ip)->v_mount->mnt_stat.f_mntonname, 204 quotatypes[type], 205 "disk quota exceeded for too long"); 206 dq->dq_flags |= DQ_BLKS; 207 } 208 return (EDQUOT); 209 } 210 } 211 return (0); 212 } 213 214 /* 215 * Check the inode limit, applying corrective action. 216 */ 217 int 218 chkiq(ip, change, cred, flags) 219 struct inode *ip; 220 int32_t change; 221 struct ucred *cred; 222 int flags; 223 { 224 struct dquot *dq; 225 int i; 226 int ncurinodes, error; 227 228 #ifdef DIAGNOSTIC 229 if ((flags & CHOWN) == 0) 230 chkdquot(ip); 231 #endif 232 if (change == 0) 233 return (0); 234 if (change < 0) { 235 for (i = 0; i < MAXQUOTAS; i++) { 236 if ((dq = ip->i_dquot[i]) == NODQUOT) 237 continue; 238 while (dq->dq_flags & DQ_LOCK) { 239 dq->dq_flags |= DQ_WANT; 240 (void) tsleep(dq, PINOD+1, "chkiq", 0); 241 } 242 ncurinodes = dq->dq_curinodes + change; 243 if (ncurinodes >= 0) 244 dq->dq_curinodes = ncurinodes; 245 else 246 dq->dq_curinodes = 0; 247 dq->dq_flags &= ~DQ_INODS; 248 dq->dq_flags |= DQ_MOD; 249 } 250 return (0); 251 } 252 if ((flags & FORCE) == 0 && cred->cr_uid != 0) { 253 for (i = 0; i < MAXQUOTAS; i++) { 254 if ((dq = ip->i_dquot[i]) == NODQUOT) 255 continue; 256 if ((error = chkiqchg(ip, change, cred, i)) != 0) 257 return (error); 258 } 259 } 260 for (i = 0; i < MAXQUOTAS; i++) { 261 if ((dq = ip->i_dquot[i]) == NODQUOT) 262 continue; 263 while (dq->dq_flags & DQ_LOCK) { 264 dq->dq_flags |= DQ_WANT; 265 (void) tsleep(dq, PINOD+1, "chkiq", 0); 266 } 267 dq->dq_curinodes += change; 268 dq->dq_flags |= DQ_MOD; 269 } 270 return (0); 271 } 272 273 /* 274 * Check for a valid change to a users allocation. 275 * Issue an error message if appropriate. 276 */ 277 int 278 chkiqchg(ip, change, cred, type) 279 struct inode *ip; 280 int32_t change; 281 struct ucred *cred; 282 int type; 283 { 284 struct dquot *dq = ip->i_dquot[type]; 285 long ncurinodes = dq->dq_curinodes + change; 286 287 /* 288 * If user would exceed their hard limit, disallow inode allocation. 289 */ 290 if (ncurinodes >= dq->dq_ihardlimit && dq->dq_ihardlimit) { 291 if ((dq->dq_flags & DQ_INODS) == 0 && 292 ip->i_uid == cred->cr_uid) { 293 uprintf("\n%s: write failed, %s inode limit reached\n", 294 ITOV(ip)->v_mount->mnt_stat.f_mntonname, 295 quotatypes[type]); 296 dq->dq_flags |= DQ_INODS; 297 } 298 return (EDQUOT); 299 } 300 /* 301 * If user is over their soft limit for too long, disallow inode 302 * allocation. Reset time limit as they cross their soft limit. 303 */ 304 if (ncurinodes >= dq->dq_isoftlimit && dq->dq_isoftlimit) { 305 if (dq->dq_curinodes < dq->dq_isoftlimit) { 306 dq->dq_itime = time.tv_sec + 307 VFSTOUFS(ITOV(ip)->v_mount)->um_itime[type]; 308 if (ip->i_uid == cred->cr_uid) 309 uprintf("\n%s: warning, %s %s\n", 310 ITOV(ip)->v_mount->mnt_stat.f_mntonname, 311 quotatypes[type], "inode quota exceeded"); 312 return (0); 313 } 314 if (time.tv_sec > dq->dq_itime) { 315 if ((dq->dq_flags & DQ_INODS) == 0 && 316 ip->i_uid == cred->cr_uid) { 317 uprintf("\n%s: write failed, %s %s\n", 318 ITOV(ip)->v_mount->mnt_stat.f_mntonname, 319 quotatypes[type], 320 "inode quota exceeded for too long"); 321 dq->dq_flags |= DQ_INODS; 322 } 323 return (EDQUOT); 324 } 325 } 326 return (0); 327 } 328 329 #ifdef DIAGNOSTIC 330 /* 331 * On filesystems with quotas enabled, it is an error for a file to change 332 * size and not to have a dquot structure associated with it. 333 */ 334 void 335 chkdquot(ip) 336 struct inode *ip; 337 { 338 struct ufsmount *ump = VFSTOUFS(ITOV(ip)->v_mount); 339 int i; 340 341 for (i = 0; i < MAXQUOTAS; i++) { 342 if (ump->um_quotas[i] == NULLVP || 343 (ump->um_qflags[i] & (QTF_OPENING|QTF_CLOSING))) 344 continue; 345 if (ip->i_dquot[i] == NODQUOT) { 346 vprint("chkdquot: missing dquot", ITOV(ip)); 347 panic("missing dquot"); 348 } 349 } 350 } 351 #endif 352 353 /* 354 * Code to process quotactl commands. 355 */ 356 357 /* 358 * Q_QUOTAON - set up a quota file for a particular file system. 359 */ 360 int 361 quotaon(p, mp, type, fname) 362 struct proc *p; 363 struct mount *mp; 364 int type; 365 caddr_t fname; 366 { 367 struct ufsmount *ump = VFSTOUFS(mp); 368 struct vnode *vp, **vpp; 369 struct vnode *nextvp; 370 struct dquot *dq; 371 int error; 372 struct nameidata nd; 373 374 vpp = &ump->um_quotas[type]; 375 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, fname, p); 376 if ((error = vn_open(&nd, FREAD|FWRITE, 0)) != 0) 377 return (error); 378 vp = nd.ni_vp; 379 VOP_UNLOCK(vp, 0); 380 if (vp->v_type != VREG) { 381 (void) vn_close(vp, FREAD|FWRITE, p->p_ucred, p); 382 return (EACCES); 383 } 384 if (*vpp != vp) 385 quotaoff(p, mp, type); 386 ump->um_qflags[type] |= QTF_OPENING; 387 mp->mnt_flag |= MNT_QUOTA; 388 vp->v_flag |= VSYSTEM; 389 *vpp = vp; 390 /* 391 * Save the credential of the process that turned on quotas. 392 * Set up the time limits for this quota. 393 */ 394 crhold(p->p_ucred); 395 ump->um_cred[type] = p->p_ucred; 396 ump->um_btime[type] = MAX_DQ_TIME; 397 ump->um_itime[type] = MAX_IQ_TIME; 398 if (dqget(NULLVP, 0, ump, type, &dq) == 0) { 399 if (dq->dq_btime > 0) 400 ump->um_btime[type] = dq->dq_btime; 401 if (dq->dq_itime > 0) 402 ump->um_itime[type] = dq->dq_itime; 403 dqrele(NULLVP, dq); 404 } 405 /* 406 * Search vnodes associated with this mount point, 407 * adding references to quota file being opened. 408 * NB: only need to add dquot's for inodes being modified. 409 */ 410 again: 411 for (vp = LIST_FIRST(&mp->mnt_vnodelist); vp != NULL; vp = nextvp) { 412 nextvp = LIST_NEXT(vp, v_mntvnodes); 413 if (vp->v_type == VNON ||vp->v_writecount == 0) 414 continue; 415 if (vget(vp, LK_EXCLUSIVE)) 416 goto again; 417 if ((error = getinoquota(VTOI(vp))) != 0) { 418 vput(vp); 419 break; 420 } 421 vput(vp); 422 if (LIST_NEXT(vp, v_mntvnodes) != nextvp || vp->v_mount != mp) 423 goto again; 424 } 425 ump->um_qflags[type] &= ~QTF_OPENING; 426 if (error) 427 quotaoff(p, mp, type); 428 return (error); 429 } 430 431 /* 432 * Q_QUOTAOFF - turn off disk quotas for a filesystem. 433 */ 434 int 435 quotaoff(p, mp, type) 436 struct proc *p; 437 struct mount *mp; 438 int type; 439 { 440 struct vnode *vp; 441 struct vnode *qvp, *nextvp; 442 struct ufsmount *ump = VFSTOUFS(mp); 443 struct dquot *dq; 444 struct inode *ip; 445 int error; 446 447 if ((qvp = ump->um_quotas[type]) == NULLVP) 448 return (0); 449 ump->um_qflags[type] |= QTF_CLOSING; 450 /* 451 * Search vnodes associated with this mount point, 452 * deleting any references to quota file being closed. 453 */ 454 again: 455 for (vp = LIST_FIRST(&mp->mnt_vnodelist); vp != NULL; vp = nextvp) { 456 nextvp = LIST_NEXT(vp, v_mntvnodes); 457 if (vp->v_type == VNON) 458 continue; 459 if (vget(vp, LK_EXCLUSIVE)) 460 goto again; 461 ip = VTOI(vp); 462 dq = ip->i_dquot[type]; 463 ip->i_dquot[type] = NODQUOT; 464 dqrele(vp, dq); 465 vput(vp); 466 if (LIST_NEXT(vp, v_mntvnodes) != nextvp || vp->v_mount != mp) 467 goto again; 468 } 469 dqflush(qvp); 470 qvp->v_flag &= ~VSYSTEM; 471 error = vn_close(qvp, FREAD|FWRITE, p->p_ucred, p); 472 ump->um_quotas[type] = NULLVP; 473 crfree(ump->um_cred[type]); 474 ump->um_cred[type] = NOCRED; 475 ump->um_qflags[type] &= ~QTF_CLOSING; 476 for (type = 0; type < MAXQUOTAS; type++) 477 if (ump->um_quotas[type] != NULLVP) 478 break; 479 if (type == MAXQUOTAS) 480 mp->mnt_flag &= ~MNT_QUOTA; 481 return (error); 482 } 483 484 /* 485 * Q_GETQUOTA - return current values in a dqblk structure. 486 */ 487 int 488 getquota(mp, id, type, addr) 489 struct mount *mp; 490 u_long id; 491 int type; 492 caddr_t addr; 493 { 494 struct dquot *dq; 495 int error; 496 497 if ((error = dqget(NULLVP, id, VFSTOUFS(mp), type, &dq)) != 0) 498 return (error); 499 error = copyout((caddr_t)&dq->dq_dqb, addr, sizeof (struct dqblk)); 500 dqrele(NULLVP, dq); 501 return (error); 502 } 503 504 /* 505 * Q_SETQUOTA - assign an entire dqblk structure. 506 */ 507 int 508 setquota(mp, id, type, addr) 509 struct mount *mp; 510 u_long id; 511 int type; 512 caddr_t addr; 513 { 514 struct dquot *dq; 515 struct dquot *ndq; 516 struct ufsmount *ump = VFSTOUFS(mp); 517 struct dqblk newlim; 518 int error; 519 520 error = copyin(addr, (caddr_t)&newlim, sizeof (struct dqblk)); 521 if (error) 522 return (error); 523 if ((error = dqget(NULLVP, id, ump, type, &ndq)) != 0) 524 return (error); 525 dq = ndq; 526 while (dq->dq_flags & DQ_LOCK) { 527 dq->dq_flags |= DQ_WANT; 528 (void) tsleep(dq, PINOD+1, "setquota", 0); 529 } 530 /* 531 * Copy all but the current values. 532 * Reset time limit if previously had no soft limit or were 533 * under it, but now have a soft limit and are over it. 534 */ 535 newlim.dqb_curblocks = dq->dq_curblocks; 536 newlim.dqb_curinodes = dq->dq_curinodes; 537 if (dq->dq_id != 0) { 538 newlim.dqb_btime = dq->dq_btime; 539 newlim.dqb_itime = dq->dq_itime; 540 } 541 if (newlim.dqb_bsoftlimit && 542 dq->dq_curblocks >= newlim.dqb_bsoftlimit && 543 (dq->dq_bsoftlimit == 0 || dq->dq_curblocks < dq->dq_bsoftlimit)) 544 newlim.dqb_btime = time.tv_sec + ump->um_btime[type]; 545 if (newlim.dqb_isoftlimit && 546 dq->dq_curinodes >= newlim.dqb_isoftlimit && 547 (dq->dq_isoftlimit == 0 || dq->dq_curinodes < dq->dq_isoftlimit)) 548 newlim.dqb_itime = time.tv_sec + ump->um_itime[type]; 549 dq->dq_dqb = newlim; 550 if (dq->dq_curblocks < dq->dq_bsoftlimit) 551 dq->dq_flags &= ~DQ_BLKS; 552 if (dq->dq_curinodes < dq->dq_isoftlimit) 553 dq->dq_flags &= ~DQ_INODS; 554 if (dq->dq_isoftlimit == 0 && dq->dq_bsoftlimit == 0 && 555 dq->dq_ihardlimit == 0 && dq->dq_bhardlimit == 0) 556 dq->dq_flags |= DQ_FAKE; 557 else 558 dq->dq_flags &= ~DQ_FAKE; 559 dq->dq_flags |= DQ_MOD; 560 dqrele(NULLVP, dq); 561 return (0); 562 } 563 564 /* 565 * Q_SETUSE - set current inode and block usage. 566 */ 567 int 568 setuse(mp, id, type, addr) 569 struct mount *mp; 570 u_long id; 571 int type; 572 caddr_t addr; 573 { 574 struct dquot *dq; 575 struct ufsmount *ump = VFSTOUFS(mp); 576 struct dquot *ndq; 577 struct dqblk usage; 578 int error; 579 580 error = copyin(addr, (caddr_t)&usage, sizeof (struct dqblk)); 581 if (error) 582 return (error); 583 if ((error = dqget(NULLVP, id, ump, type, &ndq)) != 0) 584 return (error); 585 dq = ndq; 586 while (dq->dq_flags & DQ_LOCK) { 587 dq->dq_flags |= DQ_WANT; 588 (void) tsleep(dq, PINOD+1, "setuse", 0); 589 } 590 /* 591 * Reset time limit if have a soft limit and were 592 * previously under it, but are now over it. 593 */ 594 if (dq->dq_bsoftlimit && dq->dq_curblocks < dq->dq_bsoftlimit && 595 usage.dqb_curblocks >= dq->dq_bsoftlimit) 596 dq->dq_btime = time.tv_sec + ump->um_btime[type]; 597 if (dq->dq_isoftlimit && dq->dq_curinodes < dq->dq_isoftlimit && 598 usage.dqb_curinodes >= dq->dq_isoftlimit) 599 dq->dq_itime = time.tv_sec + ump->um_itime[type]; 600 dq->dq_curblocks = usage.dqb_curblocks; 601 dq->dq_curinodes = usage.dqb_curinodes; 602 if (dq->dq_curblocks < dq->dq_bsoftlimit) 603 dq->dq_flags &= ~DQ_BLKS; 604 if (dq->dq_curinodes < dq->dq_isoftlimit) 605 dq->dq_flags &= ~DQ_INODS; 606 dq->dq_flags |= DQ_MOD; 607 dqrele(NULLVP, dq); 608 return (0); 609 } 610 611 /* 612 * Q_SYNC - sync quota files to disk. 613 */ 614 int 615 qsync(mp) 616 struct mount *mp; 617 { 618 struct ufsmount *ump = VFSTOUFS(mp); 619 struct vnode *vp, *nextvp; 620 struct dquot *dq; 621 int i, error; 622 623 /* 624 * Check if the mount point has any quotas. 625 * If not, simply return. 626 */ 627 for (i = 0; i < MAXQUOTAS; i++) 628 if (ump->um_quotas[i] != NULLVP) 629 break; 630 if (i == MAXQUOTAS) 631 return (0); 632 /* 633 * Search vnodes associated with this mount point, 634 * synchronizing any modified dquot structures. 635 */ 636 simple_lock(&mntvnode_slock); 637 again: 638 for (vp = LIST_FIRST(&mp->mnt_vnodelist); vp != NULL; vp = nextvp) { 639 if (vp->v_mount != mp) 640 goto again; 641 nextvp = LIST_NEXT(vp, v_mntvnodes); 642 if (vp->v_type == VNON) 643 continue; 644 simple_lock(&vp->v_interlock); 645 simple_unlock(&mntvnode_slock); 646 error = vget(vp, LK_EXCLUSIVE | LK_NOWAIT | LK_INTERLOCK); 647 if (error) { 648 simple_lock(&mntvnode_slock); 649 if (error == ENOENT) 650 goto again; 651 continue; 652 } 653 for (i = 0; i < MAXQUOTAS; i++) { 654 dq = VTOI(vp)->i_dquot[i]; 655 if (dq != NODQUOT && (dq->dq_flags & DQ_MOD)) 656 dqsync(vp, dq); 657 } 658 vput(vp); 659 simple_lock(&mntvnode_slock); 660 if (LIST_NEXT(vp, v_mntvnodes) != nextvp) 661 goto again; 662 } 663 simple_unlock(&mntvnode_slock); 664 return (0); 665 } 666 667 /* 668 * Code pertaining to management of the in-core dquot data structures. 669 */ 670 #define DQHASH(dqvp, id) \ 671 (((((long)(dqvp)) >> 8) + id) & dqhash) 672 LIST_HEAD(dqhashhead, dquot) *dqhashtbl; 673 u_long dqhash; 674 675 /* 676 * Dquot free list. 677 */ 678 #define DQUOTINC 5 /* minimum free dquots desired */ 679 TAILQ_HEAD(dqfreelist, dquot) dqfreelist; 680 long numdquot, desireddquot = DQUOTINC; 681 682 MALLOC_DEFINE(M_DQUOT, "UFS quota", "UFS quota entries"); 683 684 /* 685 * Initialize the quota system. 686 */ 687 void 688 dqinit() 689 { 690 dqhashtbl = 691 hashinit(desiredvnodes, HASH_LIST, M_DQUOT, M_WAITOK, &dqhash); 692 TAILQ_INIT(&dqfreelist); 693 } 694 695 void 696 dqreinit() 697 { 698 struct dquot *dq; 699 struct dqhashhead *oldhash, *hash; 700 struct vnode *dqvp; 701 u_long oldmask, mask, hashval; 702 int i; 703 704 hash = hashinit(desiredvnodes, HASH_LIST, M_DQUOT, M_WAITOK, &mask); 705 oldhash = dqhashtbl; 706 oldmask = dqhash; 707 dqhashtbl = hash; 708 dqhash = mask; 709 for (i = 0; i <= oldmask; i++) { 710 while ((dq = LIST_FIRST(&oldhash[i])) != NULL) { 711 dqvp = dq->dq_ump->um_quotas[dq->dq_type]; 712 LIST_REMOVE(dq, dq_hash); 713 hashval = DQHASH(dqvp, dq->dq_id); 714 LIST_INSERT_HEAD(&dqhashtbl[hashval], dq, dq_hash); 715 } 716 } 717 hashdone(oldhash, M_DQUOT); 718 } 719 720 /* 721 * Free resources held by quota system. 722 */ 723 void 724 dqdone() 725 { 726 hashdone(dqhashtbl, M_DQUOT); 727 } 728 729 /* 730 * Obtain a dquot structure for the specified identifier and quota file 731 * reading the information from the file if necessary. 732 */ 733 int 734 dqget(vp, id, ump, type, dqp) 735 struct vnode *vp; 736 u_long id; 737 struct ufsmount *ump; 738 int type; 739 struct dquot **dqp; 740 { 741 struct dquot *dq; 742 struct dqhashhead *dqh; 743 struct vnode *dqvp; 744 struct iovec aiov; 745 struct uio auio; 746 int error; 747 748 dqvp = ump->um_quotas[type]; 749 if (dqvp == NULLVP || (ump->um_qflags[type] & QTF_CLOSING)) { 750 *dqp = NODQUOT; 751 return (EINVAL); 752 } 753 /* 754 * Check the cache first. 755 */ 756 dqh = &dqhashtbl[DQHASH(dqvp, id)]; 757 LIST_FOREACH(dq, dqh, dq_hash) { 758 if (dq->dq_id != id || 759 dq->dq_ump->um_quotas[dq->dq_type] != dqvp) 760 continue; 761 /* 762 * Cache hit with no references. Take 763 * the structure off the free list. 764 */ 765 if (dq->dq_cnt == 0) 766 TAILQ_REMOVE(&dqfreelist, dq, dq_freelist); 767 DQREF(dq); 768 *dqp = dq; 769 return (0); 770 } 771 /* 772 * Not in cache, allocate a new one. 773 */ 774 if (dqfreelist.tqh_first == NODQUOT && 775 numdquot < MAXQUOTAS * desiredvnodes) 776 desireddquot += DQUOTINC; 777 if (numdquot < desireddquot) { 778 dq = (struct dquot *)malloc(sizeof *dq, M_DQUOT, M_WAITOK); 779 memset((char *)dq, 0, sizeof *dq); 780 numdquot++; 781 } else { 782 if ((dq = dqfreelist.tqh_first) == NULL) { 783 tablefull("dquot", 784 "increase kern.maxvnodes or NVNODE"); 785 *dqp = NODQUOT; 786 return (EUSERS); 787 } 788 if (dq->dq_cnt || (dq->dq_flags & DQ_MOD)) 789 panic("free dquot isn't"); 790 TAILQ_REMOVE(&dqfreelist, dq, dq_freelist); 791 LIST_REMOVE(dq, dq_hash); 792 } 793 /* 794 * Initialize the contents of the dquot structure. 795 */ 796 if (vp != dqvp) 797 vn_lock(dqvp, LK_EXCLUSIVE | LK_RETRY); 798 LIST_INSERT_HEAD(dqh, dq, dq_hash); 799 DQREF(dq); 800 dq->dq_flags = DQ_LOCK; 801 dq->dq_id = id; 802 dq->dq_ump = ump; 803 dq->dq_type = type; 804 auio.uio_iov = &aiov; 805 auio.uio_iovcnt = 1; 806 aiov.iov_base = (caddr_t)&dq->dq_dqb; 807 aiov.iov_len = sizeof (struct dqblk); 808 auio.uio_resid = sizeof (struct dqblk); 809 auio.uio_offset = (off_t)(id * sizeof (struct dqblk)); 810 auio.uio_segflg = UIO_SYSSPACE; 811 auio.uio_rw = UIO_READ; 812 auio.uio_procp = (struct proc *)0; 813 error = VOP_READ(dqvp, &auio, 0, ump->um_cred[type]); 814 if (auio.uio_resid == sizeof(struct dqblk) && error == 0) 815 memset((caddr_t)&dq->dq_dqb, 0, sizeof(struct dqblk)); 816 if (vp != dqvp) 817 VOP_UNLOCK(dqvp, 0); 818 if (dq->dq_flags & DQ_WANT) 819 wakeup((caddr_t)dq); 820 dq->dq_flags = 0; 821 /* 822 * I/O error in reading quota file, release 823 * quota structure and reflect problem to caller. 824 */ 825 if (error) { 826 LIST_REMOVE(dq, dq_hash); 827 dqrele(vp, dq); 828 *dqp = NODQUOT; 829 return (error); 830 } 831 /* 832 * Check for no limit to enforce. 833 * Initialize time values if necessary. 834 */ 835 if (dq->dq_isoftlimit == 0 && dq->dq_bsoftlimit == 0 && 836 dq->dq_ihardlimit == 0 && dq->dq_bhardlimit == 0) 837 dq->dq_flags |= DQ_FAKE; 838 if (dq->dq_id != 0) { 839 if (dq->dq_btime == 0) 840 dq->dq_btime = time.tv_sec + ump->um_btime[type]; 841 if (dq->dq_itime == 0) 842 dq->dq_itime = time.tv_sec + ump->um_itime[type]; 843 } 844 *dqp = dq; 845 return (0); 846 } 847 848 /* 849 * Obtain a reference to a dquot. 850 */ 851 void 852 dqref(dq) 853 struct dquot *dq; 854 { 855 856 dq->dq_cnt++; 857 } 858 859 /* 860 * Release a reference to a dquot. 861 */ 862 void 863 dqrele(vp, dq) 864 struct vnode *vp; 865 struct dquot *dq; 866 { 867 868 if (dq == NODQUOT) 869 return; 870 if (dq->dq_cnt > 1) { 871 dq->dq_cnt--; 872 return; 873 } 874 if (dq->dq_flags & DQ_MOD) 875 (void) dqsync(vp, dq); 876 if (--dq->dq_cnt > 0) 877 return; 878 TAILQ_INSERT_TAIL(&dqfreelist, dq, dq_freelist); 879 } 880 881 /* 882 * Update the disk quota in the quota file. 883 */ 884 int 885 dqsync(vp, dq) 886 struct vnode *vp; 887 struct dquot *dq; 888 { 889 struct vnode *dqvp; 890 struct mount *mp; 891 struct iovec aiov; 892 struct uio auio; 893 int error; 894 895 if (dq == NODQUOT) 896 panic("dqsync: dquot"); 897 if ((dq->dq_flags & DQ_MOD) == 0) 898 return (0); 899 if ((dqvp = dq->dq_ump->um_quotas[dq->dq_type]) == NULLVP) 900 panic("dqsync: file"); 901 vn_start_write(dqvp, &mp, V_WAIT | V_LOWER); 902 if (vp != dqvp) 903 vn_lock(dqvp, LK_EXCLUSIVE | LK_RETRY); 904 while (dq->dq_flags & DQ_LOCK) { 905 dq->dq_flags |= DQ_WANT; 906 (void) tsleep(dq, PINOD+2, "dqsync", 0); 907 if ((dq->dq_flags & DQ_MOD) == 0) { 908 if (vp != dqvp) 909 VOP_UNLOCK(dqvp, 0); 910 vn_finished_write(mp, V_LOWER); 911 return (0); 912 } 913 } 914 dq->dq_flags |= DQ_LOCK; 915 auio.uio_iov = &aiov; 916 auio.uio_iovcnt = 1; 917 aiov.iov_base = (caddr_t)&dq->dq_dqb; 918 aiov.iov_len = sizeof (struct dqblk); 919 auio.uio_resid = sizeof (struct dqblk); 920 auio.uio_offset = (off_t)(dq->dq_id * sizeof (struct dqblk)); 921 auio.uio_segflg = UIO_SYSSPACE; 922 auio.uio_rw = UIO_WRITE; 923 auio.uio_procp = (struct proc *)0; 924 error = VOP_WRITE(dqvp, &auio, 0, dq->dq_ump->um_cred[dq->dq_type]); 925 if (auio.uio_resid && error == 0) 926 error = EIO; 927 if (dq->dq_flags & DQ_WANT) 928 wakeup((caddr_t)dq); 929 dq->dq_flags &= ~(DQ_MOD|DQ_LOCK|DQ_WANT); 930 if (vp != dqvp) 931 VOP_UNLOCK(dqvp, 0); 932 vn_finished_write(mp, V_LOWER); 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 }
Cache object: 952d69b9d773597fee3c0ca3f6110a6b
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