ufs_quota.c revision 1.2
1 /* $NetBSD: ufs_quota.c,v 1.2 1994/06/29 06:47:30 cgd Exp $ */ 2 3 /* 4 * Copyright (c) 1982, 1986, 1990, 1993 5 * The Regents of the University of California. All rights reserved. 6 * 7 * This code is derived from software contributed to Berkeley by 8 * Robert Elz at The University of Melbourne. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 3. All advertising materials mentioning features or use of this software 19 * must display the following acknowledgement: 20 * This product includes software developed by the University of 21 * California, Berkeley and its contributors. 22 * 4. Neither the name of the University nor the names of its contributors 23 * may be used to endorse or promote products derived from this software 24 * without specific prior written permission. 25 * 26 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 27 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 28 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 29 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 30 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 31 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 32 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 33 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 34 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 35 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 36 * SUCH DAMAGE. 37 * 38 * @(#)ufs_quota.c 8.2 (Berkeley) 12/30/93 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 register 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 register struct inode *ip; 104 long change; 105 struct ucred *cred; 106 int flags; 107 { 108 register struct dquot *dq; 109 register 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 sleep((caddr_t)dq, PINOD+1); 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 && cred->cr_uid != 0) { 137 for (i = 0; i < MAXQUOTAS; i++) { 138 if ((dq = ip->i_dquot[i]) == NODQUOT) 139 continue; 140 if (error = chkdqchg(ip, change, cred, i)) 141 return (error); 142 } 143 } 144 for (i = 0; i < MAXQUOTAS; i++) { 145 if ((dq = ip->i_dquot[i]) == NODQUOT) 146 continue; 147 while (dq->dq_flags & DQ_LOCK) { 148 dq->dq_flags |= DQ_WANT; 149 sleep((caddr_t)dq, PINOD+1); 150 } 151 dq->dq_curblocks += change; 152 dq->dq_flags |= DQ_MOD; 153 } 154 return (0); 155 } 156 157 /* 158 * Check for a valid change to a users allocation. 159 * Issue an error message if appropriate. 160 */ 161 int 162 chkdqchg(ip, change, cred, type) 163 struct inode *ip; 164 long change; 165 struct ucred *cred; 166 int type; 167 { 168 register struct dquot *dq = ip->i_dquot[type]; 169 long ncurblocks = dq->dq_curblocks + change; 170 171 /* 172 * If user would exceed their hard limit, disallow space allocation. 173 */ 174 if (ncurblocks >= dq->dq_bhardlimit && dq->dq_bhardlimit) { 175 if ((dq->dq_flags & DQ_BLKS) == 0 && 176 ip->i_uid == cred->cr_uid) { 177 uprintf("\n%s: write failed, %s disk limit reached\n", 178 ITOV(ip)->v_mount->mnt_stat.f_mntonname, 179 quotatypes[type]); 180 dq->dq_flags |= DQ_BLKS; 181 } 182 return (EDQUOT); 183 } 184 /* 185 * If user is over their soft limit for too long, disallow space 186 * allocation. Reset time limit as they cross their soft limit. 187 */ 188 if (ncurblocks >= dq->dq_bsoftlimit && dq->dq_bsoftlimit) { 189 if (dq->dq_curblocks < dq->dq_bsoftlimit) { 190 dq->dq_btime = time.tv_sec + 191 VFSTOUFS(ITOV(ip)->v_mount)->um_btime[type]; 192 if (ip->i_uid == cred->cr_uid) 193 uprintf("\n%s: warning, %s %s\n", 194 ITOV(ip)->v_mount->mnt_stat.f_mntonname, 195 quotatypes[type], "disk quota exceeded"); 196 return (0); 197 } 198 if (time.tv_sec > dq->dq_btime) { 199 if ((dq->dq_flags & DQ_BLKS) == 0 && 200 ip->i_uid == cred->cr_uid) { 201 uprintf("\n%s: write failed, %s %s\n", 202 ITOV(ip)->v_mount->mnt_stat.f_mntonname, 203 quotatypes[type], 204 "disk quota exceeded for too long"); 205 dq->dq_flags |= DQ_BLKS; 206 } 207 return (EDQUOT); 208 } 209 } 210 return (0); 211 } 212 213 /* 214 * Check the inode limit, applying corrective action. 215 */ 216 int 217 chkiq(ip, change, cred, flags) 218 register struct inode *ip; 219 long change; 220 struct ucred *cred; 221 int flags; 222 { 223 register struct dquot *dq; 224 register int i; 225 int ncurinodes, error; 226 227 #ifdef DIAGNOSTIC 228 if ((flags & CHOWN) == 0) 229 chkdquot(ip); 230 #endif 231 if (change == 0) 232 return (0); 233 if (change < 0) { 234 for (i = 0; i < MAXQUOTAS; i++) { 235 if ((dq = ip->i_dquot[i]) == NODQUOT) 236 continue; 237 while (dq->dq_flags & DQ_LOCK) { 238 dq->dq_flags |= DQ_WANT; 239 sleep((caddr_t)dq, PINOD+1); 240 } 241 ncurinodes = dq->dq_curinodes + change; 242 if (ncurinodes >= 0) 243 dq->dq_curinodes = ncurinodes; 244 else 245 dq->dq_curinodes = 0; 246 dq->dq_flags &= ~DQ_INODS; 247 dq->dq_flags |= DQ_MOD; 248 } 249 return (0); 250 } 251 if ((flags & FORCE) == 0 && cred->cr_uid != 0) { 252 for (i = 0; i < MAXQUOTAS; i++) { 253 if ((dq = ip->i_dquot[i]) == NODQUOT) 254 continue; 255 if (error = chkiqchg(ip, change, cred, i)) 256 return (error); 257 } 258 } 259 for (i = 0; i < MAXQUOTAS; i++) { 260 if ((dq = ip->i_dquot[i]) == NODQUOT) 261 continue; 262 while (dq->dq_flags & DQ_LOCK) { 263 dq->dq_flags |= DQ_WANT; 264 sleep((caddr_t)dq, PINOD+1); 265 } 266 dq->dq_curinodes += change; 267 dq->dq_flags |= DQ_MOD; 268 } 269 return (0); 270 } 271 272 /* 273 * Check for a valid change to a users allocation. 274 * Issue an error message if appropriate. 275 */ 276 int 277 chkiqchg(ip, change, cred, type) 278 struct inode *ip; 279 long change; 280 struct ucred *cred; 281 int type; 282 { 283 register struct dquot *dq = ip->i_dquot[type]; 284 long ncurinodes = dq->dq_curinodes + change; 285 286 /* 287 * If user would exceed their hard limit, disallow inode allocation. 288 */ 289 if (ncurinodes >= dq->dq_ihardlimit && dq->dq_ihardlimit) { 290 if ((dq->dq_flags & DQ_INODS) == 0 && 291 ip->i_uid == cred->cr_uid) { 292 uprintf("\n%s: write failed, %s inode limit reached\n", 293 ITOV(ip)->v_mount->mnt_stat.f_mntonname, 294 quotatypes[type]); 295 dq->dq_flags |= DQ_INODS; 296 } 297 return (EDQUOT); 298 } 299 /* 300 * If user is over their soft limit for too long, disallow inode 301 * allocation. Reset time limit as they cross their soft limit. 302 */ 303 if (ncurinodes >= dq->dq_isoftlimit && dq->dq_isoftlimit) { 304 if (dq->dq_curinodes < dq->dq_isoftlimit) { 305 dq->dq_itime = time.tv_sec + 306 VFSTOUFS(ITOV(ip)->v_mount)->um_itime[type]; 307 if (ip->i_uid == cred->cr_uid) 308 uprintf("\n%s: warning, %s %s\n", 309 ITOV(ip)->v_mount->mnt_stat.f_mntonname, 310 quotatypes[type], "inode quota exceeded"); 311 return (0); 312 } 313 if (time.tv_sec > dq->dq_itime) { 314 if ((dq->dq_flags & DQ_INODS) == 0 && 315 ip->i_uid == cred->cr_uid) { 316 uprintf("\n%s: write failed, %s %s\n", 317 ITOV(ip)->v_mount->mnt_stat.f_mntonname, 318 quotatypes[type], 319 "inode quota exceeded for too long"); 320 dq->dq_flags |= DQ_INODS; 321 } 322 return (EDQUOT); 323 } 324 } 325 return (0); 326 } 327 328 #ifdef DIAGNOSTIC 329 /* 330 * On filesystems with quotas enabled, it is an error for a file to change 331 * size and not to have a dquot structure associated with it. 332 */ 333 void 334 chkdquot(ip) 335 register struct inode *ip; 336 { 337 struct ufsmount *ump = VFSTOUFS(ITOV(ip)->v_mount); 338 register int i; 339 340 for (i = 0; i < MAXQUOTAS; i++) { 341 if (ump->um_quotas[i] == NULLVP || 342 (ump->um_qflags[i] & (QTF_OPENING|QTF_CLOSING))) 343 continue; 344 if (ip->i_dquot[i] == NODQUOT) { 345 vprint("chkdquot: missing dquot", ITOV(ip)); 346 panic("missing dquot"); 347 } 348 } 349 } 350 #endif 351 352 /* 353 * Code to process quotactl commands. 354 */ 355 356 /* 357 * Q_QUOTAON - set up a quota file for a particular file system. 358 */ 359 int 360 quotaon(p, mp, type, fname) 361 struct proc *p; 362 struct mount *mp; 363 register int type; 364 caddr_t fname; 365 { 366 register struct ufsmount *ump = VFSTOUFS(mp); 367 register struct vnode *vp, **vpp; 368 struct vnode *nextvp; 369 struct dquot *dq; 370 int error; 371 struct nameidata nd; 372 373 vpp = &ump->um_quotas[type]; 374 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, fname, p); 375 if (error = vn_open(&nd, FREAD|FWRITE, 0)) 376 return (error); 377 vp = nd.ni_vp; 378 VOP_UNLOCK(vp); 379 if (vp->v_type != VREG) { 380 (void) vn_close(vp, FREAD|FWRITE, p->p_ucred, p); 381 return (EACCES); 382 } 383 if (vfs_busy(mp)) { 384 (void) vn_close(vp, FREAD|FWRITE, p->p_ucred, p); 385 return (EBUSY); 386 } 387 if (*vpp != vp) 388 quotaoff(p, mp, type); 389 ump->um_qflags[type] |= QTF_OPENING; 390 mp->mnt_flag |= MNT_QUOTA; 391 vp->v_flag |= VSYSTEM; 392 *vpp = vp; 393 /* 394 * Save the credential of the process that turned on quotas. 395 * Set up the time limits for this quota. 396 */ 397 crhold(p->p_ucred); 398 ump->um_cred[type] = p->p_ucred; 399 ump->um_btime[type] = MAX_DQ_TIME; 400 ump->um_itime[type] = MAX_IQ_TIME; 401 if (dqget(NULLVP, 0, ump, type, &dq) == 0) { 402 if (dq->dq_btime > 0) 403 ump->um_btime[type] = dq->dq_btime; 404 if (dq->dq_itime > 0) 405 ump->um_itime[type] = dq->dq_itime; 406 dqrele(NULLVP, dq); 407 } 408 /* 409 * Search vnodes associated with this mount point, 410 * adding references to quota file being opened. 411 * NB: only need to add dquot's for inodes being modified. 412 */ 413 again: 414 for (vp = mp->mnt_vnodelist.lh_first; vp != NULL; vp = nextvp) { 415 nextvp = vp->v_mntvnodes.le_next; 416 if (vp->v_writecount == 0) 417 continue; 418 if (vget(vp, 1)) 419 goto again; 420 if (error = getinoquota(VTOI(vp))) { 421 vput(vp); 422 break; 423 } 424 vput(vp); 425 if (vp->v_mntvnodes.le_next != nextvp || vp->v_mount != mp) 426 goto again; 427 } 428 ump->um_qflags[type] &= ~QTF_OPENING; 429 if (error) 430 quotaoff(p, mp, type); 431 vfs_unbusy(mp); 432 return (error); 433 } 434 435 /* 436 * Q_QUOTAOFF - turn off disk quotas for a filesystem. 437 */ 438 int 439 quotaoff(p, mp, type) 440 struct proc *p; 441 struct mount *mp; 442 register int type; 443 { 444 register struct vnode *vp; 445 struct vnode *qvp, *nextvp; 446 struct ufsmount *ump = VFSTOUFS(mp); 447 register struct dquot *dq; 448 register struct inode *ip; 449 int error; 450 451 if ((mp->mnt_flag & MNT_MPBUSY) == 0) 452 panic("quotaoff: not busy"); 453 if ((qvp = ump->um_quotas[type]) == NULLVP) 454 return (0); 455 ump->um_qflags[type] |= QTF_CLOSING; 456 /* 457 * Search vnodes associated with this mount point, 458 * deleting any references to quota file being closed. 459 */ 460 again: 461 for (vp = mp->mnt_vnodelist.lh_first; vp != NULL; vp = nextvp) { 462 nextvp = vp->v_mntvnodes.le_next; 463 if (vget(vp, 1)) 464 goto again; 465 ip = VTOI(vp); 466 dq = ip->i_dquot[type]; 467 ip->i_dquot[type] = NODQUOT; 468 dqrele(vp, dq); 469 vput(vp); 470 if (vp->v_mntvnodes.le_next != nextvp || vp->v_mount != mp) 471 goto again; 472 } 473 dqflush(qvp); 474 qvp->v_flag &= ~VSYSTEM; 475 error = vn_close(qvp, FREAD|FWRITE, p->p_ucred, p); 476 ump->um_quotas[type] = NULLVP; 477 crfree(ump->um_cred[type]); 478 ump->um_cred[type] = NOCRED; 479 ump->um_qflags[type] &= ~QTF_CLOSING; 480 for (type = 0; type < MAXQUOTAS; type++) 481 if (ump->um_quotas[type] != NULLVP) 482 break; 483 if (type == MAXQUOTAS) 484 mp->mnt_flag &= ~MNT_QUOTA; 485 return (error); 486 } 487 488 /* 489 * Q_GETQUOTA - return current values in a dqblk structure. 490 */ 491 int 492 getquota(mp, id, type, addr) 493 struct mount *mp; 494 u_long id; 495 int type; 496 caddr_t addr; 497 { 498 struct dquot *dq; 499 int error; 500 501 if (error = dqget(NULLVP, id, VFSTOUFS(mp), type, &dq)) 502 return (error); 503 error = copyout((caddr_t)&dq->dq_dqb, addr, sizeof (struct dqblk)); 504 dqrele(NULLVP, dq); 505 return (error); 506 } 507 508 /* 509 * Q_SETQUOTA - assign an entire dqblk structure. 510 */ 511 int 512 setquota(mp, id, type, addr) 513 struct mount *mp; 514 u_long id; 515 int type; 516 caddr_t addr; 517 { 518 register struct dquot *dq; 519 struct dquot *ndq; 520 struct ufsmount *ump = VFSTOUFS(mp); 521 struct dqblk newlim; 522 int error; 523 524 if (error = copyin(addr, (caddr_t)&newlim, sizeof (struct dqblk))) 525 return (error); 526 if (error = dqget(NULLVP, id, ump, type, &ndq)) 527 return (error); 528 dq = ndq; 529 while (dq->dq_flags & DQ_LOCK) { 530 dq->dq_flags |= DQ_WANT; 531 sleep((caddr_t)dq, PINOD+1); 532 } 533 /* 534 * Copy all but the current values. 535 * Reset time limit if previously had no soft limit or were 536 * under it, but now have a soft limit and are over it. 537 */ 538 newlim.dqb_curblocks = dq->dq_curblocks; 539 newlim.dqb_curinodes = dq->dq_curinodes; 540 if (dq->dq_id != 0) { 541 newlim.dqb_btime = dq->dq_btime; 542 newlim.dqb_itime = dq->dq_itime; 543 } 544 if (newlim.dqb_bsoftlimit && 545 dq->dq_curblocks >= newlim.dqb_bsoftlimit && 546 (dq->dq_bsoftlimit == 0 || dq->dq_curblocks < dq->dq_bsoftlimit)) 547 newlim.dqb_btime = time.tv_sec + ump->um_btime[type]; 548 if (newlim.dqb_isoftlimit && 549 dq->dq_curinodes >= newlim.dqb_isoftlimit && 550 (dq->dq_isoftlimit == 0 || dq->dq_curinodes < dq->dq_isoftlimit)) 551 newlim.dqb_itime = time.tv_sec + ump->um_itime[type]; 552 dq->dq_dqb = newlim; 553 if (dq->dq_curblocks < dq->dq_bsoftlimit) 554 dq->dq_flags &= ~DQ_BLKS; 555 if (dq->dq_curinodes < dq->dq_isoftlimit) 556 dq->dq_flags &= ~DQ_INODS; 557 if (dq->dq_isoftlimit == 0 && dq->dq_bsoftlimit == 0 && 558 dq->dq_ihardlimit == 0 && dq->dq_bhardlimit == 0) 559 dq->dq_flags |= DQ_FAKE; 560 else 561 dq->dq_flags &= ~DQ_FAKE; 562 dq->dq_flags |= DQ_MOD; 563 dqrele(NULLVP, dq); 564 return (0); 565 } 566 567 /* 568 * Q_SETUSE - set current inode and block usage. 569 */ 570 int 571 setuse(mp, id, type, addr) 572 struct mount *mp; 573 u_long id; 574 int type; 575 caddr_t addr; 576 { 577 register struct dquot *dq; 578 struct ufsmount *ump = VFSTOUFS(mp); 579 struct dquot *ndq; 580 struct dqblk usage; 581 int error; 582 583 if (error = copyin(addr, (caddr_t)&usage, sizeof (struct dqblk))) 584 return (error); 585 if (error = dqget(NULLVP, id, ump, type, &ndq)) 586 return (error); 587 dq = ndq; 588 while (dq->dq_flags & DQ_LOCK) { 589 dq->dq_flags |= DQ_WANT; 590 sleep((caddr_t)dq, PINOD+1); 591 } 592 /* 593 * Reset time limit if have a soft limit and were 594 * previously under it, but are now over it. 595 */ 596 if (dq->dq_bsoftlimit && dq->dq_curblocks < dq->dq_bsoftlimit && 597 usage.dqb_curblocks >= dq->dq_bsoftlimit) 598 dq->dq_btime = time.tv_sec + ump->um_btime[type]; 599 if (dq->dq_isoftlimit && dq->dq_curinodes < dq->dq_isoftlimit && 600 usage.dqb_curinodes >= dq->dq_isoftlimit) 601 dq->dq_itime = time.tv_sec + ump->um_itime[type]; 602 dq->dq_curblocks = usage.dqb_curblocks; 603 dq->dq_curinodes = usage.dqb_curinodes; 604 if (dq->dq_curblocks < dq->dq_bsoftlimit) 605 dq->dq_flags &= ~DQ_BLKS; 606 if (dq->dq_curinodes < dq->dq_isoftlimit) 607 dq->dq_flags &= ~DQ_INODS; 608 dq->dq_flags |= DQ_MOD; 609 dqrele(NULLVP, dq); 610 return (0); 611 } 612 613 /* 614 * Q_SYNC - sync quota files to disk. 615 */ 616 int 617 qsync(mp) 618 struct mount *mp; 619 { 620 struct ufsmount *ump = VFSTOUFS(mp); 621 register struct vnode *vp, *nextvp; 622 register struct dquot *dq; 623 register int i; 624 625 /* 626 * Check if the mount point has any quotas. 627 * If not, simply return. 628 */ 629 if ((mp->mnt_flag & MNT_MPBUSY) == 0) 630 panic("qsync: not busy"); 631 for (i = 0; i < MAXQUOTAS; i++) 632 if (ump->um_quotas[i] != NULLVP) 633 break; 634 if (i == MAXQUOTAS) 635 return (0); 636 /* 637 * Search vnodes associated with this mount point, 638 * synchronizing any modified dquot structures. 639 */ 640 again: 641 for (vp = mp->mnt_vnodelist.lh_first; vp != NULL; vp = nextvp) { 642 nextvp = vp->v_mntvnodes.le_next; 643 if (VOP_ISLOCKED(vp)) 644 continue; 645 if (vget(vp, 1)) 646 goto again; 647 for (i = 0; i < MAXQUOTAS; i++) { 648 dq = VTOI(vp)->i_dquot[i]; 649 if (dq != NODQUOT && (dq->dq_flags & DQ_MOD)) 650 dqsync(vp, dq); 651 } 652 vput(vp); 653 if (vp->v_mntvnodes.le_next != nextvp || vp->v_mount != mp) 654 goto again; 655 } 656 return (0); 657 } 658 659 /* 660 * Code pertaining to management of the in-core dquot data structures. 661 */ 662 struct dquot **dqhashtbl; 663 u_long dqhash; 664 665 /* 666 * Dquot free list. 667 */ 668 #define DQUOTINC 5 /* minimum free dquots desired */ 669 struct dquot *dqfreel, **dqback = &dqfreel; 670 long numdquot, desireddquot = DQUOTINC; 671 672 /* 673 * Initialize the quota system. 674 */ 675 void 676 dqinit() 677 { 678 679 dqhashtbl = hashinit(desiredvnodes, M_DQUOT, &dqhash); 680 } 681 682 /* 683 * Obtain a dquot structure for the specified identifier and quota file 684 * reading the information from the file if necessary. 685 */ 686 int 687 dqget(vp, id, ump, type, dqp) 688 struct vnode *vp; 689 u_long id; 690 register struct ufsmount *ump; 691 register int type; 692 struct dquot **dqp; 693 { 694 register struct dquot *dq, *dp, **dpp; 695 register struct vnode *dqvp; 696 struct iovec aiov; 697 struct uio auio; 698 int error; 699 700 dqvp = ump->um_quotas[type]; 701 if (dqvp == NULLVP || (ump->um_qflags[type] & QTF_CLOSING)) { 702 *dqp = NODQUOT; 703 return (EINVAL); 704 } 705 /* 706 * Check the cache first. 707 */ 708 dpp = &dqhashtbl[((((int)(dqvp)) >> 8) + id) & dqhash]; 709 for (dq = *dpp; dq; dq = dq->dq_forw) { 710 if (dq->dq_id != id || 711 dq->dq_ump->um_quotas[dq->dq_type] != dqvp) 712 continue; 713 /* 714 * Cache hit with no references. Take 715 * the structure off the free list. 716 */ 717 if (dq->dq_cnt == 0) { 718 if ((dp = dq->dq_freef) != NODQUOT) 719 dp->dq_freeb = dq->dq_freeb; 720 else 721 dqback = dq->dq_freeb; 722 *dq->dq_freeb = dp; 723 } 724 DQREF(dq); 725 *dqp = dq; 726 return (0); 727 } 728 /* 729 * Not in cache, allocate a new one. 730 */ 731 if (dqfreel == NODQUOT && numdquot < MAXQUOTAS * desiredvnodes) 732 desireddquot += DQUOTINC; 733 if (numdquot < desireddquot) { 734 dq = (struct dquot *)malloc(sizeof *dq, M_DQUOT, M_WAITOK); 735 bzero((char *)dq, sizeof *dq); 736 numdquot++; 737 } else { 738 if ((dq = dqfreel) == NULL) { 739 tablefull("dquot"); 740 *dqp = NODQUOT; 741 return (EUSERS); 742 } 743 if (dq->dq_cnt || (dq->dq_flags & DQ_MOD)) 744 panic("free dquot isn't"); 745 if ((dp = dq->dq_freef) != NODQUOT) 746 dp->dq_freeb = &dqfreel; 747 else 748 dqback = &dqfreel; 749 dqfreel = dp; 750 dq->dq_freef = NULL; 751 dq->dq_freeb = NULL; 752 if (dp = dq->dq_forw) 753 dp->dq_back = dq->dq_back; 754 *dq->dq_back = dp; 755 } 756 /* 757 * Initialize the contents of the dquot structure. 758 */ 759 if (vp != dqvp) 760 VOP_LOCK(dqvp); 761 if (dp = *dpp) 762 dp->dq_back = &dq->dq_forw; 763 dq->dq_forw = dp; 764 dq->dq_back = dpp; 765 *dpp = dq; 766 DQREF(dq); 767 dq->dq_flags = DQ_LOCK; 768 dq->dq_id = id; 769 dq->dq_ump = ump; 770 dq->dq_type = type; 771 auio.uio_iov = &aiov; 772 auio.uio_iovcnt = 1; 773 aiov.iov_base = (caddr_t)&dq->dq_dqb; 774 aiov.iov_len = sizeof (struct dqblk); 775 auio.uio_resid = sizeof (struct dqblk); 776 auio.uio_offset = (off_t)(id * sizeof (struct dqblk)); 777 auio.uio_segflg = UIO_SYSSPACE; 778 auio.uio_rw = UIO_READ; 779 auio.uio_procp = (struct proc *)0; 780 error = VOP_READ(dqvp, &auio, 0, ump->um_cred[type]); 781 if (auio.uio_resid == sizeof(struct dqblk) && error == 0) 782 bzero((caddr_t)&dq->dq_dqb, sizeof(struct dqblk)); 783 if (vp != dqvp) 784 VOP_UNLOCK(dqvp); 785 if (dq->dq_flags & DQ_WANT) 786 wakeup((caddr_t)dq); 787 dq->dq_flags = 0; 788 /* 789 * I/O error in reading quota file, release 790 * quota structure and reflect problem to caller. 791 */ 792 if (error) { 793 if (dp = dq->dq_forw) 794 dp->dq_back = dq->dq_back; 795 *dq->dq_back = dp; 796 dq->dq_forw = NULL; 797 dq->dq_back = NULL; 798 dqrele(vp, dq); 799 *dqp = NODQUOT; 800 return (error); 801 } 802 /* 803 * Check for no limit to enforce. 804 * Initialize time values if necessary. 805 */ 806 if (dq->dq_isoftlimit == 0 && dq->dq_bsoftlimit == 0 && 807 dq->dq_ihardlimit == 0 && dq->dq_bhardlimit == 0) 808 dq->dq_flags |= DQ_FAKE; 809 if (dq->dq_id != 0) { 810 if (dq->dq_btime == 0) 811 dq->dq_btime = time.tv_sec + ump->um_btime[type]; 812 if (dq->dq_itime == 0) 813 dq->dq_itime = time.tv_sec + ump->um_itime[type]; 814 } 815 *dqp = dq; 816 return (0); 817 } 818 819 /* 820 * Obtain a reference to a dquot. 821 */ 822 void 823 dqref(dq) 824 struct dquot *dq; 825 { 826 827 dq->dq_cnt++; 828 } 829 830 /* 831 * Release a reference to a dquot. 832 */ 833 void 834 dqrele(vp, dq) 835 struct vnode *vp; 836 register struct dquot *dq; 837 { 838 839 if (dq == NODQUOT) 840 return; 841 if (dq->dq_cnt > 1) { 842 dq->dq_cnt--; 843 return; 844 } 845 if (dq->dq_flags & DQ_MOD) 846 (void) dqsync(vp, dq); 847 if (--dq->dq_cnt > 0) 848 return; 849 if (dqfreel != NODQUOT) { 850 *dqback = dq; 851 dq->dq_freeb = dqback; 852 } else { 853 dqfreel = dq; 854 dq->dq_freeb = &dqfreel; 855 } 856 dq->dq_freef = NODQUOT; 857 dqback = &dq->dq_freef; 858 } 859 860 /* 861 * Update the disk quota in the quota file. 862 */ 863 int 864 dqsync(vp, dq) 865 struct vnode *vp; 866 register struct dquot *dq; 867 { 868 struct vnode *dqvp; 869 struct iovec aiov; 870 struct uio auio; 871 int error; 872 873 if (dq == NODQUOT) 874 panic("dqsync: dquot"); 875 if ((dq->dq_flags & DQ_MOD) == 0) 876 return (0); 877 if ((dqvp = dq->dq_ump->um_quotas[dq->dq_type]) == NULLVP) 878 panic("dqsync: file"); 879 if (vp != dqvp) 880 VOP_LOCK(dqvp); 881 while (dq->dq_flags & DQ_LOCK) { 882 dq->dq_flags |= DQ_WANT; 883 sleep((caddr_t)dq, PINOD+2); 884 if ((dq->dq_flags & DQ_MOD) == 0) { 885 if (vp != dqvp) 886 VOP_UNLOCK(dqvp); 887 return (0); 888 } 889 } 890 dq->dq_flags |= DQ_LOCK; 891 auio.uio_iov = &aiov; 892 auio.uio_iovcnt = 1; 893 aiov.iov_base = (caddr_t)&dq->dq_dqb; 894 aiov.iov_len = sizeof (struct dqblk); 895 auio.uio_resid = sizeof (struct dqblk); 896 auio.uio_offset = (off_t)(dq->dq_id * sizeof (struct dqblk)); 897 auio.uio_segflg = UIO_SYSSPACE; 898 auio.uio_rw = UIO_WRITE; 899 auio.uio_procp = (struct proc *)0; 900 error = VOP_WRITE(dqvp, &auio, 0, dq->dq_ump->um_cred[dq->dq_type]); 901 if (auio.uio_resid && error == 0) 902 error = EIO; 903 if (dq->dq_flags & DQ_WANT) 904 wakeup((caddr_t)dq); 905 dq->dq_flags &= ~(DQ_MOD|DQ_LOCK|DQ_WANT); 906 if (vp != dqvp) 907 VOP_UNLOCK(dqvp); 908 return (error); 909 } 910 911 /* 912 * Flush all entries from the cache for a particular vnode. 913 */ 914 void 915 dqflush(vp) 916 register struct vnode *vp; 917 { 918 register struct dquot *dq, *dp, **dpp, *nextdq; 919 920 /* 921 * Move all dquot's that used to refer to this quota 922 * file off their hash chains (they will eventually 923 * fall off the head of the free list and be re-used). 924 */ 925 for (dpp = &dqhashtbl[dqhash]; dpp >= dqhashtbl; dpp--) { 926 for (dq = *dpp; dq; dq = nextdq) { 927 nextdq = dq->dq_forw; 928 if (dq->dq_ump->um_quotas[dq->dq_type] != vp) 929 continue; 930 if (dq->dq_cnt) 931 panic("dqflush: stray dquot"); 932 if (dp = dq->dq_forw) 933 dp->dq_back = dq->dq_back; 934 *dq->dq_back = dp; 935 dq->dq_forw = NULL; 936 dq->dq_back = NULL; 937 dq->dq_ump = (struct ufsmount *)0; 938 } 939 } 940 } 941
Indexes created Thu Oct 02 14:10:14 GMT 2025