1 /* 2 * Copyright (c) 1982, 1986, 1990, 1993, 1995 3 * The Regents of the University of California. All rights reserved. 4 * 5 * This code is derived from software contributed to Berkeley by 6 * Robert Elz at The University of Melbourne. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 3. All advertising materials mentioning features or use of this software 17 * must display the following acknowledgement: 18 * This product includes software developed by the University of 19 * California, Berkeley and its contributors. 20 * 4. Neither the name of the University nor the names of its contributors 21 * may be used to endorse or promote products derived from this software 22 * without specific prior written permission. 23 * 24 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 27 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 34 * SUCH DAMAGE. 35 * 36 * @(#)ufs_quota.c 8.5 (Berkeley) 5/20/95 37 * $FreeBSD: src/sys/ufs/ufs/ufs_quota.c,v 1.27.2.3 2002/01/15 10:33:32 phk Exp $ 38 */ 39 40 #include <sys/param.h> 41 #include <sys/systm.h> 42 #include <sys/kernel.h> 43 #include <sys/malloc.h> 44 #include <sys/fcntl.h> 45 #include <sys/proc.h> 46 #include <sys/nlookup.h> 47 #include <sys/vnode.h> 48 #include <sys/mount.h> 49 #include <vm/vm_zone.h> 50 51 #include "quota.h" 52 #include "inode.h" 53 #include "ufsmount.h" 54 55 static MALLOC_DEFINE(M_DQUOT, "UFS quota", "UFS quota entries"); 56 57 /* 58 * Quota name to error message mapping. 59 */ 60 static char *quotatypes[] = INITQFNAMES; 61 62 static int ufs_chkdqchg (struct inode *, long, struct ucred *, int); 63 static int ufs_chkiqchg (struct inode *, long, struct ucred *, int); 64 static int ufs_dqget (struct vnode *, 65 u_long, struct ufsmount *, int, struct ufs_dquot **); 66 static int ufs_dqsync (struct vnode *, struct ufs_dquot *); 67 static void ufs_dqflush (struct vnode *); 68 static void ufs_quotawarn(struct ufs_dquot *dq); 69 70 #ifdef DIAGNOSTIC 71 static void ufs_dqref (struct ufs_dquot *); 72 static void ufs_chkdquot (struct inode *); 73 #endif 74 75 /* 76 * Set up the quotas for an inode. 77 * 78 * This routine completely defines the semantics of quotas. 79 * If other criterion want to be used to establish quotas, the 80 * MAXQUOTAS value in quotas.h should be increased, and the 81 * additional dquots set up here. 82 */ 83 int 84 ufs_getinoquota(struct inode *ip) 85 { 86 struct ufsmount *ump; 87 struct vnode *vp = ITOV(ip); 88 int error; 89 90 ump = VFSTOUFS(vp->v_mount); 91 /* 92 * Set up the user quota based on file uid. 93 * EINVAL means that quotas are not enabled. 94 */ 95 if (ip->i_dquot[USRQUOTA] == NODQUOT && 96 (error = ufs_dqget(vp, ip->i_uid, ump, USRQUOTA, &ip->i_dquot[USRQUOTA])) && 97 error != EINVAL) 98 return (error); 99 /* 100 * Set up the group quota based on file gid. 101 * EINVAL means that quotas are not enabled. 102 */ 103 if (ip->i_dquot[GRPQUOTA] == NODQUOT && 104 (error = ufs_dqget(vp, ip->i_gid, ump, GRPQUOTA, &ip->i_dquot[GRPQUOTA])) && 105 error != EINVAL) 106 return (error); 107 return (0); 108 } 109 110 /* 111 * Update disk usage, and take corrective action. 112 */ 113 int 114 ufs_chkdq(struct inode *ip, long change, struct ucred *cred, int flags) 115 { 116 struct ufs_dquot *dq; 117 int i; 118 int ncurblocks, error; 119 120 #ifdef DIAGNOSTIC 121 if ((flags & CHOWN) == 0) 122 ufs_chkdquot(ip); 123 #endif 124 if (change == 0) 125 return (0); 126 if (change < 0) { 127 for (i = 0; i < MAXQUOTAS; i++) { 128 if ((dq = ip->i_dquot[i]) == NODQUOT) 129 continue; 130 if (dq->dq_ump->um_quotas[dq->dq_type] == ip->i_vnode) { 131 ufs_quotawarn(dq); 132 continue; 133 } 134 while (dq->dq_flags & DQ_LOCK) { 135 dq->dq_flags |= DQ_WANT; 136 (void) tsleep((caddr_t)dq, 0, "chkdq1", 0); 137 } 138 ncurblocks = dq->dq_curblocks + change; 139 if (ncurblocks >= 0) 140 dq->dq_curblocks = ncurblocks; 141 else 142 dq->dq_curblocks = 0; 143 dq->dq_flags &= ~DQ_BLKS; 144 dq->dq_flags |= DQ_MOD; 145 } 146 return (0); 147 } 148 if ((flags & FORCE) == 0 && cred->cr_uid != 0) { 149 for (i = 0; i < MAXQUOTAS; i++) { 150 if ((dq = ip->i_dquot[i]) == NODQUOT) 151 continue; 152 if (dq->dq_ump->um_quotas[dq->dq_type] == ip->i_vnode) { 153 ufs_quotawarn(dq); 154 continue; 155 } 156 error = ufs_chkdqchg(ip, change, cred, i); 157 if (error) 158 return (error); 159 } 160 } 161 for (i = 0; i < MAXQUOTAS; i++) { 162 if ((dq = ip->i_dquot[i]) == NODQUOT) 163 continue; 164 if (dq->dq_ump->um_quotas[dq->dq_type] == ip->i_vnode) { 165 ufs_quotawarn(dq); 166 continue; 167 } 168 while (dq->dq_flags & DQ_LOCK) { 169 dq->dq_flags |= DQ_WANT; 170 (void) tsleep((caddr_t)dq, 0, "chkdq2", 0); 171 } 172 /* Reset timer when crossing soft limit */ 173 if (dq->dq_curblocks + change >= dq->dq_bsoftlimit && 174 dq->dq_curblocks < dq->dq_bsoftlimit) 175 dq->dq_btime = time_second + 176 VFSTOUFS(ITOV(ip)->v_mount)->um_btime[i]; 177 dq->dq_curblocks += change; 178 dq->dq_flags |= DQ_MOD; 179 } 180 return (0); 181 } 182 183 /* 184 * Check for a valid change to a users allocation. 185 * Issue an error message if appropriate. 186 */ 187 static int 188 ufs_chkdqchg(struct inode *ip, long change, struct ucred *cred, int type) 189 { 190 struct ufs_dquot *dq = ip->i_dquot[type]; 191 long ncurblocks = dq->dq_curblocks + change; 192 193 /* 194 * If user would exceed their hard limit, disallow space allocation. 195 */ 196 if (ncurblocks >= dq->dq_bhardlimit && dq->dq_bhardlimit) { 197 if ((dq->dq_flags & DQ_BLKS) == 0 && 198 ip->i_uid == cred->cr_uid) { 199 uprintf("\n%s: write failed, %s disk limit reached\n", 200 ITOV(ip)->v_mount->mnt_stat.f_mntfromname, 201 quotatypes[type]); 202 dq->dq_flags |= DQ_BLKS; 203 } 204 return (EDQUOT); 205 } 206 /* 207 * If user is over their soft limit for too long, disallow space 208 * allocation. Reset time limit as they cross their soft limit. 209 */ 210 if (ncurblocks >= dq->dq_bsoftlimit && dq->dq_bsoftlimit) { 211 if (dq->dq_curblocks < dq->dq_bsoftlimit) { 212 dq->dq_btime = time_second + 213 VFSTOUFS(ITOV(ip)->v_mount)->um_btime[type]; 214 if (ip->i_uid == cred->cr_uid) 215 uprintf("\n%s: warning, %s %s\n", 216 ITOV(ip)->v_mount->mnt_stat.f_mntfromname, 217 quotatypes[type], "disk quota exceeded"); 218 return (0); 219 } 220 if (time_second > dq->dq_btime) { 221 if ((dq->dq_flags & DQ_BLKS) == 0 && 222 ip->i_uid == cred->cr_uid) { 223 uprintf("\n%s: write failed, %s %s\n", 224 ITOV(ip)->v_mount->mnt_stat.f_mntfromname, 225 quotatypes[type], 226 "disk quota exceeded for too long"); 227 dq->dq_flags |= DQ_BLKS; 228 } 229 return (EDQUOT); 230 } 231 } 232 return (0); 233 } 234 235 /* 236 * Check the inode limit, applying corrective action. 237 */ 238 int 239 ufs_chkiq(struct inode *ip, long change, struct ucred *cred, int flags) 240 { 241 struct ufs_dquot *dq; 242 int i; 243 int ncurinodes, error; 244 245 #ifdef DIAGNOSTIC 246 if ((flags & CHOWN) == 0) 247 ufs_chkdquot(ip); 248 #endif 249 if (change == 0) 250 return (0); 251 if (change < 0) { 252 for (i = 0; i < MAXQUOTAS; i++) { 253 if ((dq = ip->i_dquot[i]) == NODQUOT) 254 continue; 255 if (dq->dq_ump->um_quotas[dq->dq_type] == ip->i_vnode) { 256 ufs_quotawarn(dq); 257 continue; 258 } 259 while (dq->dq_flags & DQ_LOCK) { 260 dq->dq_flags |= DQ_WANT; 261 (void) tsleep((caddr_t)dq, 0, "chkiq1", 0); 262 } 263 ncurinodes = dq->dq_curinodes + change; 264 if (ncurinodes >= 0) 265 dq->dq_curinodes = ncurinodes; 266 else 267 dq->dq_curinodes = 0; 268 dq->dq_flags &= ~DQ_INODS; 269 dq->dq_flags |= DQ_MOD; 270 } 271 return (0); 272 } 273 if ((flags & FORCE) == 0 && cred->cr_uid != 0) { 274 for (i = 0; i < MAXQUOTAS; i++) { 275 if ((dq = ip->i_dquot[i]) == NODQUOT) 276 continue; 277 if (dq->dq_ump->um_quotas[dq->dq_type] == ip->i_vnode) { 278 ufs_quotawarn(dq); 279 continue; 280 } 281 error = ufs_chkiqchg(ip, change, cred, i); 282 if (error) 283 return (error); 284 } 285 } 286 for (i = 0; i < MAXQUOTAS; i++) { 287 if ((dq = ip->i_dquot[i]) == NODQUOT) 288 continue; 289 if (dq->dq_ump->um_quotas[dq->dq_type] == ip->i_vnode) { 290 ufs_quotawarn(dq); 291 continue; 292 } 293 while (dq->dq_flags & DQ_LOCK) { 294 dq->dq_flags |= DQ_WANT; 295 (void) tsleep((caddr_t)dq, 0, "chkiq2", 0); 296 } 297 /* Reset timer when crossing soft limit */ 298 if (dq->dq_curinodes + change >= dq->dq_isoftlimit && 299 dq->dq_curinodes < dq->dq_isoftlimit) 300 dq->dq_itime = time_second + 301 VFSTOUFS(ITOV(ip)->v_mount)->um_itime[i]; 302 dq->dq_curinodes += change; 303 dq->dq_flags |= DQ_MOD; 304 } 305 return (0); 306 } 307 308 /* 309 * Check for a valid change to a users allocation. 310 * Issue an error message if appropriate. 311 */ 312 static int 313 ufs_chkiqchg(struct inode *ip, long change, struct ucred *cred, int type) 314 { 315 struct ufs_dquot *dq = ip->i_dquot[type]; 316 long ncurinodes = dq->dq_curinodes + change; 317 318 /* 319 * If user would exceed their hard limit, disallow inode allocation. 320 */ 321 if (ncurinodes >= dq->dq_ihardlimit && dq->dq_ihardlimit) { 322 if ((dq->dq_flags & DQ_INODS) == 0 && 323 ip->i_uid == cred->cr_uid) { 324 uprintf("\n%s: write failed, %s inode limit reached\n", 325 ITOV(ip)->v_mount->mnt_stat.f_mntfromname, 326 quotatypes[type]); 327 dq->dq_flags |= DQ_INODS; 328 } 329 return (EDQUOT); 330 } 331 /* 332 * If user is over their soft limit for too long, disallow inode 333 * allocation. Reset time limit as they cross their soft limit. 334 */ 335 if (ncurinodes >= dq->dq_isoftlimit && dq->dq_isoftlimit) { 336 if (dq->dq_curinodes < dq->dq_isoftlimit) { 337 dq->dq_itime = time_second + 338 VFSTOUFS(ITOV(ip)->v_mount)->um_itime[type]; 339 if (ip->i_uid == cred->cr_uid) 340 uprintf("\n%s: warning, %s %s\n", 341 ITOV(ip)->v_mount->mnt_stat.f_mntfromname, 342 quotatypes[type], "inode quota exceeded"); 343 return (0); 344 } 345 if (time_second > dq->dq_itime) { 346 if ((dq->dq_flags & DQ_INODS) == 0 && 347 ip->i_uid == cred->cr_uid) { 348 uprintf("\n%s: write failed, %s %s\n", 349 ITOV(ip)->v_mount->mnt_stat.f_mntfromname, 350 quotatypes[type], 351 "inode quota exceeded for too long"); 352 dq->dq_flags |= DQ_INODS; 353 } 354 return (EDQUOT); 355 } 356 } 357 return (0); 358 } 359 360 /* 361 * To avoid a deadlock we disallow quota operations on the quota file itself. 362 * This generally means that quotacheck was not run on the filesystem. 363 */ 364 static 365 void 366 ufs_quotawarn(struct ufs_dquot *dq) 367 { 368 static int dqticks; 369 370 if (dqticks != ticks / hz) { 371 dqticks = ticks / hz; 372 uprintf("%s: warning, quota file expanded, quotacheck " 373 "was not run!\n", 374 dq->dq_ump->um_mountp->mnt_stat.f_mntfromname); 375 } 376 } 377 378 #ifdef DIAGNOSTIC 379 /* 380 * On filesystems with quotas enabled, it is an error for a file to change 381 * size and not to have a dquot structure associated with it. 382 */ 383 static void 384 ufs_chkdquot(struct inode *ip) 385 { 386 struct ufsmount *ump = VFSTOUFS(ITOV(ip)->v_mount); 387 int i; 388 389 for (i = 0; i < MAXQUOTAS; i++) { 390 if (ump->um_quotas[i] == NULLVP || 391 (ump->um_qflags[i] & (QTF_OPENING|QTF_CLOSING))) 392 continue; 393 if (ip->i_dquot[i] == NODQUOT) { 394 vprint("chkdquot: missing dquot", ITOV(ip)); 395 panic("chkdquot: missing dquot"); 396 } 397 } 398 } 399 #endif 400 401 /* 402 * Code to process quotactl commands. 403 */ 404 405 struct scaninfo { 406 int rescan; 407 int type; 408 }; 409 410 /* 411 * Q_QUOTAON - set up a quota file for a particular filesystem. 412 */ 413 static int ufs_quotaon_scan(struct mount *mp, struct vnode *vp, void *data); 414 415 int 416 ufs_quotaon(struct ucred *cred, struct mount *mp, int type, caddr_t fname) 417 { 418 struct ufsmount *ump = VFSTOUFS(mp); 419 struct vnode *vp, **vpp; 420 struct ufs_dquot *dq; 421 int error; 422 struct nlookupdata nd; 423 struct scaninfo scaninfo; 424 425 vpp = &ump->um_quotas[type]; 426 error = nlookup_init(&nd, fname, UIO_USERSPACE, NLC_FOLLOW|NLC_LOCKVP); 427 if (error == 0) 428 error = vn_open(&nd, NULL, FREAD|FWRITE, 0); 429 if (error == 0 && nd.nl_open_vp->v_type != VREG) 430 error = EACCES; 431 if (error) { 432 nlookup_done(&nd); 433 return (error); 434 } 435 vp = nd.nl_open_vp; 436 nd.nl_open_vp = NULL; 437 nlookup_done(&nd); 438 439 vn_unlock(vp); 440 if (*vpp != vp) 441 ufs_quotaoff(mp, type); 442 ump->um_qflags[type] |= QTF_OPENING; 443 mp->mnt_flag |= MNT_QUOTA; 444 vsetflags(vp, VSYSTEM); 445 *vpp = vp; 446 /* XXX release duplicate vp if *vpp == vp? */ 447 /* 448 * Save the credential of the process that turned on quotas. 449 * Set up the time limits for this quota. 450 */ 451 ump->um_cred[type] = crhold(cred); 452 ump->um_btime[type] = MAX_DQ_TIME; 453 ump->um_itime[type] = MAX_IQ_TIME; 454 if (ufs_dqget(NULLVP, 0, ump, type, &dq) == 0) { 455 if (dq->dq_btime > 0) 456 ump->um_btime[type] = dq->dq_btime; 457 if (dq->dq_itime > 0) 458 ump->um_itime[type] = dq->dq_itime; 459 ufs_dqrele(NULLVP, dq); 460 } 461 /* 462 * Search vnodes associated with this mount point, 463 * adding references to quota file being opened. 464 * NB: only need to add dquot's for inodes being modified. 465 */ 466 scaninfo.rescan = 1; 467 while (scaninfo.rescan) { 468 scaninfo.rescan = 0; 469 error = vmntvnodescan(mp, VMSC_GETVP, 470 NULL, ufs_quotaon_scan, &scaninfo); 471 if (error) 472 break; 473 } 474 ump->um_qflags[type] &= ~QTF_OPENING; 475 if (error) 476 ufs_quotaoff(mp, type); 477 return (error); 478 } 479 480 static int 481 ufs_quotaon_scan(struct mount *mp, struct vnode *vp, void *data) 482 { 483 int error; 484 /*struct scaninfo *info = data;*/ 485 486 if (vp->v_writecount == 0) 487 return(0); 488 error = ufs_getinoquota(VTOI(vp)); 489 return(error); 490 } 491 492 /* 493 * Q_QUOTAOFF - turn off disk quotas for a filesystem. 494 */ 495 496 static int ufs_quotaoff_scan(struct mount *mp, struct vnode *vp, void *data); 497 498 int 499 ufs_quotaoff(struct mount *mp, int type) 500 { 501 struct vnode *qvp; 502 struct ufsmount *ump = VFSTOUFS(mp); 503 int error; 504 struct scaninfo scaninfo; 505 506 if ((qvp = ump->um_quotas[type]) == NULLVP) 507 return (0); 508 ump->um_qflags[type] |= QTF_CLOSING; 509 510 /* 511 * Search vnodes associated with this mount point, 512 * deleting any references to quota file being closed. 513 */ 514 scaninfo.rescan = 1; 515 scaninfo.type = type; 516 while (scaninfo.rescan) { 517 scaninfo.rescan = 0; 518 vmntvnodescan(mp, VMSC_GETVP, NULL, ufs_quotaoff_scan, &scaninfo); 519 } 520 ufs_dqflush(qvp); 521 vclrflags(qvp, VSYSTEM); 522 error = vn_close(qvp, FREAD|FWRITE); 523 ump->um_quotas[type] = NULLVP; 524 crfree(ump->um_cred[type]); 525 ump->um_cred[type] = NOCRED; 526 ump->um_qflags[type] &= ~QTF_CLOSING; 527 for (type = 0; type < MAXQUOTAS; type++) { 528 if (ump->um_quotas[type] != NULLVP) 529 break; 530 } 531 if (type == MAXQUOTAS) 532 mp->mnt_flag &= ~MNT_QUOTA; 533 return (error); 534 } 535 536 static int 537 ufs_quotaoff_scan(struct mount *mp, struct vnode *vp, void *data) 538 { 539 struct scaninfo *info = data; 540 struct ufs_dquot *dq; 541 struct inode *ip; 542 543 if (vp->v_type == VNON) { 544 return(0); 545 } 546 ip = VTOI(vp); 547 dq = ip->i_dquot[info->type]; 548 ip->i_dquot[info->type] = NODQUOT; 549 ufs_dqrele(vp, dq); 550 return(0); 551 } 552 553 /* 554 * Q_GETQUOTA - return current values in a dqblk structure. 555 */ 556 int 557 ufs_getquota(struct mount *mp, u_long id, int type, caddr_t addr) 558 { 559 struct ufs_dquot *dq; 560 int error; 561 562 error = ufs_dqget(NULLVP, id, VFSTOUFS(mp), type, &dq); 563 if (error) 564 return (error); 565 error = copyout((caddr_t)&dq->dq_dqb, addr, sizeof (struct ufs_dqblk)); 566 ufs_dqrele(NULLVP, dq); 567 return (error); 568 } 569 570 /* 571 * Q_SETQUOTA - assign an entire dqblk structure. 572 */ 573 int 574 ufs_setquota(struct mount *mp, u_long id, int type, caddr_t addr) 575 { 576 struct ufs_dquot *dq; 577 struct ufs_dquot *ndq; 578 struct ufsmount *ump = VFSTOUFS(mp); 579 struct ufs_dqblk newlim; 580 int error; 581 582 error = copyin(addr, (caddr_t)&newlim, sizeof (struct ufs_dqblk)); 583 if (error) 584 return (error); 585 error = ufs_dqget(NULLVP, id, ump, type, &ndq); 586 if (error) 587 return (error); 588 dq = ndq; 589 while (dq->dq_flags & DQ_LOCK) { 590 dq->dq_flags |= DQ_WANT; 591 (void) tsleep((caddr_t)dq, 0, "setqta", 0); 592 } 593 /* 594 * Copy all but the current values. 595 * Reset time limit if previously had no soft limit or were 596 * under it, but now have a soft limit and are over it. 597 */ 598 newlim.dqb_curblocks = dq->dq_curblocks; 599 newlim.dqb_curinodes = dq->dq_curinodes; 600 if (dq->dq_id != 0) { 601 newlim.dqb_btime = dq->dq_btime; 602 newlim.dqb_itime = dq->dq_itime; 603 } 604 if (newlim.dqb_bsoftlimit && 605 dq->dq_curblocks >= newlim.dqb_bsoftlimit && 606 (dq->dq_bsoftlimit == 0 || dq->dq_curblocks < dq->dq_bsoftlimit)) 607 newlim.dqb_btime = time_second + ump->um_btime[type]; 608 if (newlim.dqb_isoftlimit && 609 dq->dq_curinodes >= newlim.dqb_isoftlimit && 610 (dq->dq_isoftlimit == 0 || dq->dq_curinodes < dq->dq_isoftlimit)) 611 newlim.dqb_itime = time_second + ump->um_itime[type]; 612 dq->dq_dqb = newlim; 613 if (dq->dq_curblocks < dq->dq_bsoftlimit) 614 dq->dq_flags &= ~DQ_BLKS; 615 if (dq->dq_curinodes < dq->dq_isoftlimit) 616 dq->dq_flags &= ~DQ_INODS; 617 if (dq->dq_isoftlimit == 0 && dq->dq_bsoftlimit == 0 && 618 dq->dq_ihardlimit == 0 && dq->dq_bhardlimit == 0) 619 dq->dq_flags |= DQ_FAKE; 620 else 621 dq->dq_flags &= ~DQ_FAKE; 622 dq->dq_flags |= DQ_MOD; 623 ufs_dqrele(NULLVP, dq); 624 return (0); 625 } 626 627 /* 628 * Q_SETUSE - set current inode and block usage. 629 */ 630 int 631 ufs_setuse(struct mount *mp, u_long id, int type, caddr_t addr) 632 { 633 struct ufs_dquot *dq; 634 struct ufsmount *ump = VFSTOUFS(mp); 635 struct ufs_dquot *ndq; 636 struct ufs_dqblk usage; 637 int error; 638 639 error = copyin(addr, (caddr_t)&usage, sizeof (struct ufs_dqblk)); 640 if (error) 641 return (error); 642 error = ufs_dqget(NULLVP, id, ump, type, &ndq); 643 if (error) 644 return (error); 645 dq = ndq; 646 while (dq->dq_flags & DQ_LOCK) { 647 dq->dq_flags |= DQ_WANT; 648 (void) tsleep((caddr_t)dq, 0, "setuse", 0); 649 } 650 /* 651 * Reset time limit if have a soft limit and were 652 * previously under it, but are now over it. 653 */ 654 if (dq->dq_bsoftlimit && dq->dq_curblocks < dq->dq_bsoftlimit && 655 usage.dqb_curblocks >= dq->dq_bsoftlimit) 656 dq->dq_btime = time_second + ump->um_btime[type]; 657 if (dq->dq_isoftlimit && dq->dq_curinodes < dq->dq_isoftlimit && 658 usage.dqb_curinodes >= dq->dq_isoftlimit) 659 dq->dq_itime = time_second + ump->um_itime[type]; 660 dq->dq_curblocks = usage.dqb_curblocks; 661 dq->dq_curinodes = usage.dqb_curinodes; 662 if (dq->dq_curblocks < dq->dq_bsoftlimit) 663 dq->dq_flags &= ~DQ_BLKS; 664 if (dq->dq_curinodes < dq->dq_isoftlimit) 665 dq->dq_flags &= ~DQ_INODS; 666 dq->dq_flags |= DQ_MOD; 667 ufs_dqrele(NULLVP, dq); 668 return (0); 669 } 670 671 /* 672 * Q_SYNC - sync quota files to disk. 673 */ 674 675 static int ufs_qsync_scan(struct mount *mp, struct vnode *vp, void *data); 676 677 int 678 ufs_qsync(struct mount *mp) 679 { 680 struct ufsmount *ump = VFSTOUFS(mp); 681 struct scaninfo scaninfo; 682 int i; 683 684 /* 685 * Check if the mount point has any quotas. 686 * If not, simply return. 687 */ 688 for (i = 0; i < MAXQUOTAS; i++) 689 if (ump->um_quotas[i] != NULLVP) 690 break; 691 if (i == MAXQUOTAS) 692 return (0); 693 /* 694 * Search vnodes associated with this mount point, 695 * synchronizing any modified ufs_dquot structures. 696 */ 697 scaninfo.rescan = 1; 698 while (scaninfo.rescan) { 699 scaninfo.rescan = 0; 700 vmntvnodescan(mp, VMSC_GETVP|VMSC_NOWAIT, 701 NULL, ufs_qsync_scan, &scaninfo); 702 } 703 return (0); 704 } 705 706 static int 707 ufs_qsync_scan(struct mount *mp, struct vnode *vp, void *data) 708 { 709 /*struct scaninfo *info = data;*/ 710 struct ufs_dquot *dq; 711 /* int error;*/ 712 int i; 713 714 for (i = 0; i < MAXQUOTAS; i++) { 715 dq = VTOI(vp)->i_dquot[i]; 716 if (dq != NODQUOT && (dq->dq_flags & DQ_MOD)) 717 ufs_dqsync(vp, dq); 718 } 719 return(0); 720 } 721 722 /* 723 * Code pertaining to management of the in-core dquot data structures. 724 */ 725 #define DQHASH(dqvp, id) \ 726 (&ufs_dqhashtbl[((((intptr_t)(dqvp)) >> 8) + id) & ufs_dqhash]) 727 static LIST_HEAD(ufs_dqhash, ufs_dquot) *ufs_dqhashtbl; 728 static u_long ufs_dqhash; 729 730 /* 731 * Dquot free list. 732 */ 733 #define DQUOTINC 5 /* minimum free dquots desired */ 734 static TAILQ_HEAD(ufs_dqfreelist, ufs_dquot) ufs_dqfreelist; 735 static long ufs_numdquot, ufs_desireddquot = DQUOTINC; 736 737 /* 738 * Initialize the quota system. 739 */ 740 void 741 ufs_dqinit(void) 742 { 743 ufs_dqhashtbl = hashinit(desiredvnodes, M_DQUOT, &ufs_dqhash); 744 TAILQ_INIT(&ufs_dqfreelist); 745 } 746 747 /* 748 * Obtain a dquot structure for the specified identifier and quota file 749 * reading the information from the file if necessary. 750 */ 751 static int 752 ufs_dqget(struct vnode *vp, u_long id, struct ufsmount *ump, int type, 753 struct ufs_dquot **dqp) 754 { 755 struct ufs_dquot *dq; 756 struct ufs_dqhash *dqh; 757 struct vnode *dqvp; 758 struct iovec aiov; 759 struct uio auio; 760 int error; 761 762 dqvp = ump->um_quotas[type]; 763 if (dqvp == NULLVP || (ump->um_qflags[type] & QTF_CLOSING)) { 764 *dqp = NODQUOT; 765 return (EINVAL); 766 } 767 /* 768 * Check the cache first. 769 */ 770 dqh = DQHASH(dqvp, id); 771 LIST_FOREACH(dq, dqh, dq_hash) { 772 if (dq->dq_id != id || 773 dq->dq_ump->um_quotas[dq->dq_type] != dqvp) 774 continue; 775 /* 776 * Cache hit with no references. Take 777 * the structure off the free list. 778 */ 779 if (dq->dq_cnt == 0) 780 TAILQ_REMOVE(&ufs_dqfreelist, dq, dq_freelist); 781 DQREF(dq); 782 *dqp = dq; 783 return (0); 784 } 785 /* 786 * Not in cache, allocate a new one. 787 */ 788 if (TAILQ_EMPTY(&ufs_dqfreelist) && ufs_numdquot < MAXQUOTAS * desiredvnodes) 789 ufs_desireddquot += DQUOTINC; 790 if (ufs_numdquot < ufs_desireddquot) { 791 dq = (struct ufs_dquot *) 792 kmalloc(sizeof *dq, M_DQUOT, M_WAITOK | M_ZERO); 793 ufs_numdquot++; 794 } else { 795 if ((dq = TAILQ_FIRST(&ufs_dqfreelist)) == NULL) { 796 tablefull("dquot"); 797 *dqp = NODQUOT; 798 return (EUSERS); 799 } 800 if (dq->dq_cnt || (dq->dq_flags & DQ_MOD)) 801 panic("dqget: free dquot isn't"); 802 TAILQ_REMOVE(&ufs_dqfreelist, dq, dq_freelist); 803 if (dq->dq_ump != NULL) 804 LIST_REMOVE(dq, dq_hash); 805 } 806 /* 807 * Initialize the contents of the dquot structure. 808 */ 809 if (vp != dqvp) 810 vn_lock(dqvp, LK_EXCLUSIVE | LK_RETRY); 811 LIST_INSERT_HEAD(dqh, dq, dq_hash); 812 DQREF(dq); 813 dq->dq_flags = DQ_LOCK; 814 dq->dq_id = id; 815 dq->dq_ump = ump; 816 dq->dq_type = type; 817 auio.uio_iov = &aiov; 818 auio.uio_iovcnt = 1; 819 aiov.iov_base = (caddr_t)&dq->dq_dqb; 820 aiov.iov_len = sizeof (struct ufs_dqblk); 821 auio.uio_resid = sizeof (struct ufs_dqblk); 822 auio.uio_offset = (off_t)(id * sizeof (struct ufs_dqblk)); 823 auio.uio_segflg = UIO_SYSSPACE; 824 auio.uio_rw = UIO_READ; 825 auio.uio_td = NULL; 826 error = VOP_READ(dqvp, &auio, 0, ump->um_cred[type]); 827 if (auio.uio_resid == sizeof(struct ufs_dqblk) && error == 0) 828 bzero((caddr_t)&dq->dq_dqb, sizeof(struct ufs_dqblk)); 829 if (vp != dqvp) 830 vn_unlock(dqvp); 831 if (dq->dq_flags & DQ_WANT) 832 wakeup((caddr_t)dq); 833 dq->dq_flags = 0; 834 /* 835 * I/O error in reading quota file, release 836 * quota structure and reflect problem to caller. 837 */ 838 if (error) { 839 LIST_REMOVE(dq, dq_hash); 840 ufs_dqrele(vp, dq); 841 *dqp = NODQUOT; 842 return (error); 843 } 844 /* 845 * Check for no limit to enforce. 846 * Initialize time values if necessary. 847 */ 848 if (dq->dq_isoftlimit == 0 && dq->dq_bsoftlimit == 0 && 849 dq->dq_ihardlimit == 0 && dq->dq_bhardlimit == 0) 850 dq->dq_flags |= DQ_FAKE; 851 if (dq->dq_id != 0) { 852 if (dq->dq_btime == 0) 853 dq->dq_btime = time_second + ump->um_btime[type]; 854 if (dq->dq_itime == 0) 855 dq->dq_itime = time_second + ump->um_itime[type]; 856 } 857 *dqp = dq; 858 return (0); 859 } 860 861 #ifdef DIAGNOSTIC 862 /* 863 * Obtain a reference to a dquot. 864 */ 865 static void 866 ufs_dqref(struct ufs_dquot *dq) 867 { 868 dq->dq_cnt++; 869 } 870 #endif 871 872 /* 873 * Release a reference to a dquot. 874 */ 875 void 876 ufs_dqrele(struct vnode *vp, struct ufs_dquot *dq) 877 { 878 if (dq == NODQUOT) 879 return; 880 if (dq->dq_cnt > 1) { 881 dq->dq_cnt--; 882 return; 883 } 884 if (dq->dq_flags & DQ_MOD) 885 (void)ufs_dqsync(vp, dq); 886 if (--dq->dq_cnt > 0) 887 return; 888 TAILQ_INSERT_TAIL(&ufs_dqfreelist, dq, dq_freelist); 889 } 890 891 /* 892 * Update the disk quota in the quota file. 893 */ 894 static int 895 ufs_dqsync(struct vnode *vp, struct ufs_dquot *dq) 896 { 897 struct vnode *dqvp; 898 struct iovec aiov; 899 struct uio auio; 900 int error; 901 902 if (dq == NODQUOT) 903 panic("dqsync: dquot"); 904 if ((dq->dq_flags & DQ_MOD) == 0) 905 return (0); 906 if ((dqvp = dq->dq_ump->um_quotas[dq->dq_type]) == NULLVP) 907 panic("dqsync: file"); 908 if (vp != dqvp) 909 vn_lock(dqvp, LK_EXCLUSIVE | LK_RETRY); 910 while (dq->dq_flags & DQ_LOCK) { 911 dq->dq_flags |= DQ_WANT; 912 (void) tsleep((caddr_t)dq, 0, "dqsync", 0); 913 if ((dq->dq_flags & DQ_MOD) == 0) { 914 if (vp != dqvp) 915 vn_unlock(dqvp); 916 return (0); 917 } 918 } 919 dq->dq_flags |= DQ_LOCK; 920 auio.uio_iov = &aiov; 921 auio.uio_iovcnt = 1; 922 aiov.iov_base = (caddr_t)&dq->dq_dqb; 923 aiov.iov_len = sizeof (struct ufs_dqblk); 924 auio.uio_resid = sizeof (struct ufs_dqblk); 925 auio.uio_offset = (off_t)(dq->dq_id * sizeof (struct ufs_dqblk)); 926 auio.uio_segflg = UIO_SYSSPACE; 927 auio.uio_rw = UIO_WRITE; 928 auio.uio_td = NULL; 929 error = VOP_WRITE(dqvp, &auio, 0, dq->dq_ump->um_cred[dq->dq_type]); 930 if (auio.uio_resid && error == 0) 931 error = EIO; 932 if (dq->dq_flags & DQ_WANT) 933 wakeup((caddr_t)dq); 934 dq->dq_flags &= ~(DQ_MOD|DQ_LOCK|DQ_WANT); 935 if (vp != dqvp) 936 vn_unlock(dqvp); 937 return (error); 938 } 939 940 /* 941 * Flush all entries from the cache for a particular vnode. 942 */ 943 static void 944 ufs_dqflush(struct vnode *vp) 945 { 946 struct ufs_dquot *dq, *nextdq; 947 struct ufs_dqhash *dqh; 948 949 /* 950 * Move all dquot's that used to refer to this quota 951 * file off their hash chains (they will eventually 952 * fall off the head of the free list and be re-used). 953 */ 954 for (dqh = &ufs_dqhashtbl[ufs_dqhash]; dqh >= ufs_dqhashtbl; dqh--) { 955 for (dq = dqh->lh_first; dq; dq = nextdq) { 956 nextdq = dq->dq_hash.le_next; 957 if (dq->dq_ump->um_quotas[dq->dq_type] != vp) 958 continue; 959 if (dq->dq_cnt) 960 panic("dqflush: stray dquot"); 961 LIST_REMOVE(dq, dq_hash); 962 dq->dq_ump = NULL; 963 } 964 } 965 } 966