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 * $DragonFly: src/sys/vfs/ufs/ufs_quota.c,v 1.22 2006/05/06 16:20:19 dillon Exp $ 39 */ 40 41 #include <sys/param.h> 42 #include <sys/systm.h> 43 #include <sys/kernel.h> 44 #include <sys/malloc.h> 45 #include <sys/fcntl.h> 46 #include <sys/proc.h> 47 #include <sys/nlookup.h> 48 #include <sys/vnode.h> 49 #include <sys/mount.h> 50 #include <vm/vm_zone.h> 51 52 #include "quota.h" 53 #include "inode.h" 54 #include "ufsmount.h" 55 56 static MALLOC_DEFINE(M_DQUOT, "UFS quota", "UFS quota entries"); 57 58 /* 59 * Quota name to error message mapping. 60 */ 61 static char *quotatypes[] = INITQFNAMES; 62 63 static int ufs_chkdqchg (struct inode *, long, struct ucred *, int); 64 static int ufs_chkiqchg (struct inode *, long, struct ucred *, int); 65 static int ufs_dqget (struct vnode *, 66 u_long, struct ufsmount *, int, struct ufs_dquot **); 67 static int ufs_dqsync (struct vnode *, struct ufs_dquot *); 68 static void ufs_dqflush (struct vnode *); 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 while (dq->dq_flags & DQ_LOCK) { 131 dq->dq_flags |= DQ_WANT; 132 (void) tsleep((caddr_t)dq, 0, "chkdq1", 0); 133 } 134 ncurblocks = dq->dq_curblocks + change; 135 if (ncurblocks >= 0) 136 dq->dq_curblocks = ncurblocks; 137 else 138 dq->dq_curblocks = 0; 139 dq->dq_flags &= ~DQ_BLKS; 140 dq->dq_flags |= DQ_MOD; 141 } 142 return (0); 143 } 144 if ((flags & FORCE) == 0 && cred->cr_uid != 0) { 145 for (i = 0; i < MAXQUOTAS; i++) { 146 if ((dq = ip->i_dquot[i]) == NODQUOT) 147 continue; 148 error = ufs_chkdqchg(ip, change, cred, i); 149 if (error) 150 return (error); 151 } 152 } 153 for (i = 0; i < MAXQUOTAS; i++) { 154 if ((dq = ip->i_dquot[i]) == NODQUOT) 155 continue; 156 while (dq->dq_flags & DQ_LOCK) { 157 dq->dq_flags |= DQ_WANT; 158 (void) tsleep((caddr_t)dq, 0, "chkdq2", 0); 159 } 160 /* Reset timer when crossing soft limit */ 161 if (dq->dq_curblocks + change >= dq->dq_bsoftlimit && 162 dq->dq_curblocks < dq->dq_bsoftlimit) 163 dq->dq_btime = time_second + 164 VFSTOUFS(ITOV(ip)->v_mount)->um_btime[i]; 165 dq->dq_curblocks += change; 166 dq->dq_flags |= DQ_MOD; 167 } 168 return (0); 169 } 170 171 /* 172 * Check for a valid change to a users allocation. 173 * Issue an error message if appropriate. 174 */ 175 static int 176 ufs_chkdqchg(struct inode *ip, long change, struct ucred *cred, int type) 177 { 178 struct ufs_dquot *dq = ip->i_dquot[type]; 179 long ncurblocks = dq->dq_curblocks + change; 180 181 /* 182 * If user would exceed their hard limit, disallow space allocation. 183 */ 184 if (ncurblocks >= dq->dq_bhardlimit && dq->dq_bhardlimit) { 185 if ((dq->dq_flags & DQ_BLKS) == 0 && 186 ip->i_uid == cred->cr_uid) { 187 uprintf("\n%s: write failed, %s disk limit reached\n", 188 ITOV(ip)->v_mount->mnt_stat.f_mntfromname, 189 quotatypes[type]); 190 dq->dq_flags |= DQ_BLKS; 191 } 192 return (EDQUOT); 193 } 194 /* 195 * If user is over their soft limit for too long, disallow space 196 * allocation. Reset time limit as they cross their soft limit. 197 */ 198 if (ncurblocks >= dq->dq_bsoftlimit && dq->dq_bsoftlimit) { 199 if (dq->dq_curblocks < dq->dq_bsoftlimit) { 200 dq->dq_btime = time_second + 201 VFSTOUFS(ITOV(ip)->v_mount)->um_btime[type]; 202 if (ip->i_uid == cred->cr_uid) 203 uprintf("\n%s: warning, %s %s\n", 204 ITOV(ip)->v_mount->mnt_stat.f_mntfromname, 205 quotatypes[type], "disk quota exceeded"); 206 return (0); 207 } 208 if (time_second > dq->dq_btime) { 209 if ((dq->dq_flags & DQ_BLKS) == 0 && 210 ip->i_uid == cred->cr_uid) { 211 uprintf("\n%s: write failed, %s %s\n", 212 ITOV(ip)->v_mount->mnt_stat.f_mntfromname, 213 quotatypes[type], 214 "disk quota exceeded for too long"); 215 dq->dq_flags |= DQ_BLKS; 216 } 217 return (EDQUOT); 218 } 219 } 220 return (0); 221 } 222 223 /* 224 * Check the inode limit, applying corrective action. 225 */ 226 int 227 ufs_chkiq(struct inode *ip, long change, struct ucred *cred, int flags) 228 { 229 struct ufs_dquot *dq; 230 int i; 231 int ncurinodes, error; 232 233 #ifdef DIAGNOSTIC 234 if ((flags & CHOWN) == 0) 235 ufs_chkdquot(ip); 236 #endif 237 if (change == 0) 238 return (0); 239 if (change < 0) { 240 for (i = 0; i < MAXQUOTAS; i++) { 241 if ((dq = ip->i_dquot[i]) == NODQUOT) 242 continue; 243 while (dq->dq_flags & DQ_LOCK) { 244 dq->dq_flags |= DQ_WANT; 245 (void) tsleep((caddr_t)dq, 0, "chkiq1", 0); 246 } 247 ncurinodes = dq->dq_curinodes + change; 248 if (ncurinodes >= 0) 249 dq->dq_curinodes = ncurinodes; 250 else 251 dq->dq_curinodes = 0; 252 dq->dq_flags &= ~DQ_INODS; 253 dq->dq_flags |= DQ_MOD; 254 } 255 return (0); 256 } 257 if ((flags & FORCE) == 0 && cred->cr_uid != 0) { 258 for (i = 0; i < MAXQUOTAS; i++) { 259 if ((dq = ip->i_dquot[i]) == NODQUOT) 260 continue; 261 error = ufs_chkiqchg(ip, change, cred, i); 262 if (error) 263 return (error); 264 } 265 } 266 for (i = 0; i < MAXQUOTAS; i++) { 267 if ((dq = ip->i_dquot[i]) == NODQUOT) 268 continue; 269 while (dq->dq_flags & DQ_LOCK) { 270 dq->dq_flags |= DQ_WANT; 271 (void) tsleep((caddr_t)dq, 0, "chkiq2", 0); 272 } 273 /* Reset timer when crossing soft limit */ 274 if (dq->dq_curinodes + change >= dq->dq_isoftlimit && 275 dq->dq_curinodes < dq->dq_isoftlimit) 276 dq->dq_itime = time_second + 277 VFSTOUFS(ITOV(ip)->v_mount)->um_itime[i]; 278 dq->dq_curinodes += change; 279 dq->dq_flags |= DQ_MOD; 280 } 281 return (0); 282 } 283 284 /* 285 * Check for a valid change to a users allocation. 286 * Issue an error message if appropriate. 287 */ 288 static int 289 ufs_chkiqchg(struct inode *ip, long change, struct ucred *cred, int type) 290 { 291 struct ufs_dquot *dq = ip->i_dquot[type]; 292 long ncurinodes = dq->dq_curinodes + change; 293 294 /* 295 * If user would exceed their hard limit, disallow inode allocation. 296 */ 297 if (ncurinodes >= dq->dq_ihardlimit && dq->dq_ihardlimit) { 298 if ((dq->dq_flags & DQ_INODS) == 0 && 299 ip->i_uid == cred->cr_uid) { 300 uprintf("\n%s: write failed, %s inode limit reached\n", 301 ITOV(ip)->v_mount->mnt_stat.f_mntfromname, 302 quotatypes[type]); 303 dq->dq_flags |= DQ_INODS; 304 } 305 return (EDQUOT); 306 } 307 /* 308 * If user is over their soft limit for too long, disallow inode 309 * allocation. Reset time limit as they cross their soft limit. 310 */ 311 if (ncurinodes >= dq->dq_isoftlimit && dq->dq_isoftlimit) { 312 if (dq->dq_curinodes < dq->dq_isoftlimit) { 313 dq->dq_itime = time_second + 314 VFSTOUFS(ITOV(ip)->v_mount)->um_itime[type]; 315 if (ip->i_uid == cred->cr_uid) 316 uprintf("\n%s: warning, %s %s\n", 317 ITOV(ip)->v_mount->mnt_stat.f_mntfromname, 318 quotatypes[type], "inode quota exceeded"); 319 return (0); 320 } 321 if (time_second > dq->dq_itime) { 322 if ((dq->dq_flags & DQ_INODS) == 0 && 323 ip->i_uid == cred->cr_uid) { 324 uprintf("\n%s: write failed, %s %s\n", 325 ITOV(ip)->v_mount->mnt_stat.f_mntfromname, 326 quotatypes[type], 327 "inode quota exceeded for too long"); 328 dq->dq_flags |= DQ_INODS; 329 } 330 return (EDQUOT); 331 } 332 } 333 return (0); 334 } 335 336 #ifdef DIAGNOSTIC 337 /* 338 * On filesystems with quotas enabled, it is an error for a file to change 339 * size and not to have a dquot structure associated with it. 340 */ 341 static void 342 ufs_chkdquot(struct inode *ip) 343 { 344 struct ufsmount *ump = VFSTOUFS(ITOV(ip)->v_mount); 345 int i; 346 347 for (i = 0; i < MAXQUOTAS; i++) { 348 if (ump->um_quotas[i] == NULLVP || 349 (ump->um_qflags[i] & (QTF_OPENING|QTF_CLOSING))) 350 continue; 351 if (ip->i_dquot[i] == NODQUOT) { 352 vprint("chkdquot: missing dquot", ITOV(ip)); 353 panic("chkdquot: missing dquot"); 354 } 355 } 356 } 357 #endif 358 359 /* 360 * Code to process quotactl commands. 361 */ 362 363 struct scaninfo { 364 int rescan; 365 int type; 366 }; 367 368 /* 369 * Q_QUOTAON - set up a quota file for a particular filesystem. 370 */ 371 static int ufs_quotaon_scan(struct mount *mp, struct vnode *vp, void *data); 372 373 int 374 ufs_quotaon(struct ucred *cred, struct mount *mp, int type, caddr_t fname) 375 { 376 struct ufsmount *ump = VFSTOUFS(mp); 377 struct vnode *vp, **vpp; 378 struct ufs_dquot *dq; 379 int error; 380 struct nlookupdata nd; 381 struct scaninfo scaninfo; 382 383 vpp = &ump->um_quotas[type]; 384 error = nlookup_init(&nd, fname, UIO_USERSPACE, NLC_FOLLOW|NLC_LOCKVP); 385 if (error == 0) 386 error = vn_open(&nd, NULL, FREAD|FWRITE, 0); 387 if (error == 0 && nd.nl_open_vp->v_type != VREG) 388 error = EACCES; 389 if (error) { 390 nlookup_done(&nd); 391 return (error); 392 } 393 vp = nd.nl_open_vp; 394 nd.nl_open_vp = NULL; 395 nlookup_done(&nd); 396 397 VOP_UNLOCK(vp, 0); 398 if (*vpp != vp) 399 ufs_quotaoff(mp, type); 400 ump->um_qflags[type] |= QTF_OPENING; 401 mp->mnt_flag |= MNT_QUOTA; 402 vp->v_flag |= VSYSTEM; 403 *vpp = vp; 404 /* XXX release duplicate vp if *vpp == vp? */ 405 /* 406 * Save the credential of the process that turned on quotas. 407 * Set up the time limits for this quota. 408 */ 409 ump->um_cred[type] = crhold(cred); 410 ump->um_btime[type] = MAX_DQ_TIME; 411 ump->um_itime[type] = MAX_IQ_TIME; 412 if (ufs_dqget(NULLVP, 0, ump, type, &dq) == 0) { 413 if (dq->dq_btime > 0) 414 ump->um_btime[type] = dq->dq_btime; 415 if (dq->dq_itime > 0) 416 ump->um_itime[type] = dq->dq_itime; 417 ufs_dqrele(NULLVP, dq); 418 } 419 /* 420 * Search vnodes associated with this mount point, 421 * adding references to quota file being opened. 422 * NB: only need to add dquot's for inodes being modified. 423 */ 424 scaninfo.rescan = 1; 425 while (scaninfo.rescan) { 426 scaninfo.rescan = 0; 427 error = vmntvnodescan(mp, VMSC_GETVP, 428 NULL, ufs_quotaon_scan, &scaninfo); 429 if (error) 430 break; 431 } 432 ump->um_qflags[type] &= ~QTF_OPENING; 433 if (error) 434 ufs_quotaoff(mp, type); 435 return (error); 436 } 437 438 static int 439 ufs_quotaon_scan(struct mount *mp, struct vnode *vp, void *data) 440 { 441 int error; 442 /*struct scaninfo *info = data;*/ 443 444 if (vp->v_writecount == 0) 445 return(0); 446 error = ufs_getinoquota(VTOI(vp)); 447 return(error); 448 } 449 450 /* 451 * Q_QUOTAOFF - turn off disk quotas for a filesystem. 452 */ 453 454 static int ufs_quotaoff_scan(struct mount *mp, struct vnode *vp, void *data); 455 456 int 457 ufs_quotaoff(struct mount *mp, int type) 458 { 459 struct vnode *qvp; 460 struct ufsmount *ump = VFSTOUFS(mp); 461 int error; 462 struct scaninfo scaninfo; 463 464 if ((qvp = ump->um_quotas[type]) == NULLVP) 465 return (0); 466 ump->um_qflags[type] |= QTF_CLOSING; 467 468 /* 469 * Search vnodes associated with this mount point, 470 * deleting any references to quota file being closed. 471 */ 472 scaninfo.rescan = 1; 473 scaninfo.type = type; 474 while (scaninfo.rescan) { 475 scaninfo.rescan = 0; 476 vmntvnodescan(mp, VMSC_GETVP, NULL, ufs_quotaoff_scan, &scaninfo); 477 } 478 ufs_dqflush(qvp); 479 qvp->v_flag &= ~VSYSTEM; 480 error = vn_close(qvp, FREAD|FWRITE); 481 ump->um_quotas[type] = NULLVP; 482 crfree(ump->um_cred[type]); 483 ump->um_cred[type] = NOCRED; 484 ump->um_qflags[type] &= ~QTF_CLOSING; 485 for (type = 0; type < MAXQUOTAS; type++) { 486 if (ump->um_quotas[type] != NULLVP) 487 break; 488 } 489 if (type == MAXQUOTAS) 490 mp->mnt_flag &= ~MNT_QUOTA; 491 return (error); 492 } 493 494 static int 495 ufs_quotaoff_scan(struct mount *mp, struct vnode *vp, void *data) 496 { 497 struct scaninfo *info = data; 498 struct ufs_dquot *dq; 499 struct inode *ip; 500 501 if (vp->v_type == VNON) { 502 return(0); 503 } 504 ip = VTOI(vp); 505 dq = ip->i_dquot[info->type]; 506 ip->i_dquot[info->type] = NODQUOT; 507 ufs_dqrele(vp, dq); 508 return(0); 509 } 510 511 /* 512 * Q_GETQUOTA - return current values in a dqblk structure. 513 */ 514 int 515 ufs_getquota(struct mount *mp, u_long id, int type, caddr_t addr) 516 { 517 struct ufs_dquot *dq; 518 int error; 519 520 error = ufs_dqget(NULLVP, id, VFSTOUFS(mp), type, &dq); 521 if (error) 522 return (error); 523 error = copyout((caddr_t)&dq->dq_dqb, addr, sizeof (struct ufs_dqblk)); 524 ufs_dqrele(NULLVP, dq); 525 return (error); 526 } 527 528 /* 529 * Q_SETQUOTA - assign an entire dqblk structure. 530 */ 531 int 532 ufs_setquota(struct mount *mp, u_long id, int type, caddr_t addr) 533 { 534 struct ufs_dquot *dq; 535 struct ufs_dquot *ndq; 536 struct ufsmount *ump = VFSTOUFS(mp); 537 struct ufs_dqblk newlim; 538 int error; 539 540 error = copyin(addr, (caddr_t)&newlim, sizeof (struct ufs_dqblk)); 541 if (error) 542 return (error); 543 error = ufs_dqget(NULLVP, id, ump, type, &ndq); 544 if (error) 545 return (error); 546 dq = ndq; 547 while (dq->dq_flags & DQ_LOCK) { 548 dq->dq_flags |= DQ_WANT; 549 (void) tsleep((caddr_t)dq, 0, "setqta", 0); 550 } 551 /* 552 * Copy all but the current values. 553 * Reset time limit if previously had no soft limit or were 554 * under it, but now have a soft limit and are over it. 555 */ 556 newlim.dqb_curblocks = dq->dq_curblocks; 557 newlim.dqb_curinodes = dq->dq_curinodes; 558 if (dq->dq_id != 0) { 559 newlim.dqb_btime = dq->dq_btime; 560 newlim.dqb_itime = dq->dq_itime; 561 } 562 if (newlim.dqb_bsoftlimit && 563 dq->dq_curblocks >= newlim.dqb_bsoftlimit && 564 (dq->dq_bsoftlimit == 0 || dq->dq_curblocks < dq->dq_bsoftlimit)) 565 newlim.dqb_btime = time_second + ump->um_btime[type]; 566 if (newlim.dqb_isoftlimit && 567 dq->dq_curinodes >= newlim.dqb_isoftlimit && 568 (dq->dq_isoftlimit == 0 || dq->dq_curinodes < dq->dq_isoftlimit)) 569 newlim.dqb_itime = time_second + ump->um_itime[type]; 570 dq->dq_dqb = newlim; 571 if (dq->dq_curblocks < dq->dq_bsoftlimit) 572 dq->dq_flags &= ~DQ_BLKS; 573 if (dq->dq_curinodes < dq->dq_isoftlimit) 574 dq->dq_flags &= ~DQ_INODS; 575 if (dq->dq_isoftlimit == 0 && dq->dq_bsoftlimit == 0 && 576 dq->dq_ihardlimit == 0 && dq->dq_bhardlimit == 0) 577 dq->dq_flags |= DQ_FAKE; 578 else 579 dq->dq_flags &= ~DQ_FAKE; 580 dq->dq_flags |= DQ_MOD; 581 ufs_dqrele(NULLVP, dq); 582 return (0); 583 } 584 585 /* 586 * Q_SETUSE - set current inode and block usage. 587 */ 588 int 589 ufs_setuse(struct mount *mp, u_long id, int type, caddr_t addr) 590 { 591 struct ufs_dquot *dq; 592 struct ufsmount *ump = VFSTOUFS(mp); 593 struct ufs_dquot *ndq; 594 struct ufs_dqblk usage; 595 int error; 596 597 error = copyin(addr, (caddr_t)&usage, sizeof (struct ufs_dqblk)); 598 if (error) 599 return (error); 600 error = ufs_dqget(NULLVP, id, ump, type, &ndq); 601 if (error) 602 return (error); 603 dq = ndq; 604 while (dq->dq_flags & DQ_LOCK) { 605 dq->dq_flags |= DQ_WANT; 606 (void) tsleep((caddr_t)dq, 0, "setuse", 0); 607 } 608 /* 609 * Reset time limit if have a soft limit and were 610 * previously under it, but are now over it. 611 */ 612 if (dq->dq_bsoftlimit && dq->dq_curblocks < dq->dq_bsoftlimit && 613 usage.dqb_curblocks >= dq->dq_bsoftlimit) 614 dq->dq_btime = time_second + ump->um_btime[type]; 615 if (dq->dq_isoftlimit && dq->dq_curinodes < dq->dq_isoftlimit && 616 usage.dqb_curinodes >= dq->dq_isoftlimit) 617 dq->dq_itime = time_second + ump->um_itime[type]; 618 dq->dq_curblocks = usage.dqb_curblocks; 619 dq->dq_curinodes = usage.dqb_curinodes; 620 if (dq->dq_curblocks < dq->dq_bsoftlimit) 621 dq->dq_flags &= ~DQ_BLKS; 622 if (dq->dq_curinodes < dq->dq_isoftlimit) 623 dq->dq_flags &= ~DQ_INODS; 624 dq->dq_flags |= DQ_MOD; 625 ufs_dqrele(NULLVP, dq); 626 return (0); 627 } 628 629 /* 630 * Q_SYNC - sync quota files to disk. 631 */ 632 633 static int ufs_qsync_scan(struct mount *mp, struct vnode *vp, void *data); 634 635 int 636 ufs_qsync(struct mount *mp) 637 { 638 struct ufsmount *ump = VFSTOUFS(mp); 639 struct scaninfo scaninfo; 640 int i; 641 642 /* 643 * Check if the mount point has any quotas. 644 * If not, simply return. 645 */ 646 for (i = 0; i < MAXQUOTAS; i++) 647 if (ump->um_quotas[i] != NULLVP) 648 break; 649 if (i == MAXQUOTAS) 650 return (0); 651 /* 652 * Search vnodes associated with this mount point, 653 * synchronizing any modified ufs_dquot structures. 654 */ 655 scaninfo.rescan = 1; 656 while (scaninfo.rescan) { 657 scaninfo.rescan = 0; 658 vmntvnodescan(mp, VMSC_GETVP|VMSC_NOWAIT, 659 NULL, ufs_qsync_scan, &scaninfo); 660 } 661 return (0); 662 } 663 664 static int 665 ufs_qsync_scan(struct mount *mp, struct vnode *vp, void *data) 666 { 667 /*struct scaninfo *info = data;*/ 668 struct ufs_dquot *dq; 669 /* int error;*/ 670 int i; 671 672 for (i = 0; i < MAXQUOTAS; i++) { 673 dq = VTOI(vp)->i_dquot[i]; 674 if (dq != NODQUOT && (dq->dq_flags & DQ_MOD)) 675 ufs_dqsync(vp, dq); 676 } 677 return(0); 678 } 679 680 /* 681 * Code pertaining to management of the in-core dquot data structures. 682 */ 683 #define DQHASH(dqvp, id) \ 684 (&ufs_dqhashtbl[((((intptr_t)(dqvp)) >> 8) + id) & ufs_dqhash]) 685 static LIST_HEAD(ufs_dqhash, ufs_dquot) *ufs_dqhashtbl; 686 static u_long ufs_dqhash; 687 688 /* 689 * Dquot free list. 690 */ 691 #define DQUOTINC 5 /* minimum free dquots desired */ 692 static TAILQ_HEAD(ufs_dqfreelist, ufs_dquot) ufs_dqfreelist; 693 static long ufs_numdquot, ufs_desireddquot = DQUOTINC; 694 695 /* 696 * Initialize the quota system. 697 */ 698 void 699 ufs_dqinit(void) 700 { 701 ufs_dqhashtbl = hashinit(desiredvnodes, M_DQUOT, &ufs_dqhash); 702 TAILQ_INIT(&ufs_dqfreelist); 703 } 704 705 /* 706 * Obtain a dquot structure for the specified identifier and quota file 707 * reading the information from the file if necessary. 708 */ 709 static int 710 ufs_dqget(struct vnode *vp, u_long id, struct ufsmount *ump, int type, 711 struct ufs_dquot **dqp) 712 { 713 struct ufs_dquot *dq; 714 struct ufs_dqhash *dqh; 715 struct vnode *dqvp; 716 struct iovec aiov; 717 struct uio auio; 718 int error; 719 720 dqvp = ump->um_quotas[type]; 721 if (dqvp == NULLVP || (ump->um_qflags[type] & QTF_CLOSING)) { 722 *dqp = NODQUOT; 723 return (EINVAL); 724 } 725 /* 726 * Check the cache first. 727 */ 728 dqh = DQHASH(dqvp, id); 729 for (dq = dqh->lh_first; dq; dq = dq->dq_hash.le_next) { 730 if (dq->dq_id != id || 731 dq->dq_ump->um_quotas[dq->dq_type] != dqvp) 732 continue; 733 /* 734 * Cache hit with no references. Take 735 * the structure off the free list. 736 */ 737 if (dq->dq_cnt == 0) 738 TAILQ_REMOVE(&ufs_dqfreelist, dq, dq_freelist); 739 DQREF(dq); 740 *dqp = dq; 741 return (0); 742 } 743 /* 744 * Not in cache, allocate a new one. 745 */ 746 if (TAILQ_EMPTY(&ufs_dqfreelist) && ufs_numdquot < MAXQUOTAS * desiredvnodes) 747 ufs_desireddquot += DQUOTINC; 748 if (ufs_numdquot < ufs_desireddquot) { 749 dq = (struct ufs_dquot *)malloc(sizeof *dq, M_DQUOT, M_WAITOK); 750 bzero((char *)dq, sizeof *dq); 751 ufs_numdquot++; 752 } else { 753 if ((dq = TAILQ_FIRST(&ufs_dqfreelist)) == NULL) { 754 tablefull("dquot"); 755 *dqp = NODQUOT; 756 return (EUSERS); 757 } 758 if (dq->dq_cnt || (dq->dq_flags & DQ_MOD)) 759 panic("dqget: free dquot isn't"); 760 TAILQ_REMOVE(&ufs_dqfreelist, dq, dq_freelist); 761 if (dq->dq_ump != NULL) 762 LIST_REMOVE(dq, dq_hash); 763 } 764 /* 765 * Initialize the contents of the dquot structure. 766 */ 767 if (vp != dqvp) 768 vn_lock(dqvp, LK_EXCLUSIVE | LK_RETRY); 769 LIST_INSERT_HEAD(dqh, dq, dq_hash); 770 DQREF(dq); 771 dq->dq_flags = DQ_LOCK; 772 dq->dq_id = id; 773 dq->dq_ump = ump; 774 dq->dq_type = type; 775 auio.uio_iov = &aiov; 776 auio.uio_iovcnt = 1; 777 aiov.iov_base = (caddr_t)&dq->dq_dqb; 778 aiov.iov_len = sizeof (struct ufs_dqblk); 779 auio.uio_resid = sizeof (struct ufs_dqblk); 780 auio.uio_offset = (off_t)(id * sizeof (struct ufs_dqblk)); 781 auio.uio_segflg = UIO_SYSSPACE; 782 auio.uio_rw = UIO_READ; 783 auio.uio_td = NULL; 784 error = VOP_READ(dqvp, &auio, 0, ump->um_cred[type]); 785 if (auio.uio_resid == sizeof(struct ufs_dqblk) && error == 0) 786 bzero((caddr_t)&dq->dq_dqb, sizeof(struct ufs_dqblk)); 787 if (vp != dqvp) 788 VOP_UNLOCK(dqvp, 0); 789 if (dq->dq_flags & DQ_WANT) 790 wakeup((caddr_t)dq); 791 dq->dq_flags = 0; 792 /* 793 * I/O error in reading quota file, release 794 * quota structure and reflect problem to caller. 795 */ 796 if (error) { 797 LIST_REMOVE(dq, dq_hash); 798 ufs_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_second + ump->um_btime[type]; 812 if (dq->dq_itime == 0) 813 dq->dq_itime = time_second + ump->um_itime[type]; 814 } 815 *dqp = dq; 816 return (0); 817 } 818 819 #ifdef DIAGNOSTIC 820 /* 821 * Obtain a reference to a dquot. 822 */ 823 static void 824 ufs_dqref(struct ufs_dquot *dq) 825 { 826 dq->dq_cnt++; 827 } 828 #endif 829 830 /* 831 * Release a reference to a dquot. 832 */ 833 void 834 ufs_dqrele(struct vnode *vp, struct ufs_dquot *dq) 835 { 836 if (dq == NODQUOT) 837 return; 838 if (dq->dq_cnt > 1) { 839 dq->dq_cnt--; 840 return; 841 } 842 if (dq->dq_flags & DQ_MOD) 843 (void)ufs_dqsync(vp, dq); 844 if (--dq->dq_cnt > 0) 845 return; 846 TAILQ_INSERT_TAIL(&ufs_dqfreelist, dq, dq_freelist); 847 } 848 849 /* 850 * Update the disk quota in the quota file. 851 */ 852 static int 853 ufs_dqsync(struct vnode *vp, struct ufs_dquot *dq) 854 { 855 struct vnode *dqvp; 856 struct iovec aiov; 857 struct uio auio; 858 int error; 859 860 if (dq == NODQUOT) 861 panic("dqsync: dquot"); 862 if ((dq->dq_flags & DQ_MOD) == 0) 863 return (0); 864 if ((dqvp = dq->dq_ump->um_quotas[dq->dq_type]) == NULLVP) 865 panic("dqsync: file"); 866 if (vp != dqvp) 867 vn_lock(dqvp, LK_EXCLUSIVE | LK_RETRY); 868 while (dq->dq_flags & DQ_LOCK) { 869 dq->dq_flags |= DQ_WANT; 870 (void) tsleep((caddr_t)dq, 0, "dqsync", 0); 871 if ((dq->dq_flags & DQ_MOD) == 0) { 872 if (vp != dqvp) 873 VOP_UNLOCK(dqvp, 0); 874 return (0); 875 } 876 } 877 dq->dq_flags |= DQ_LOCK; 878 auio.uio_iov = &aiov; 879 auio.uio_iovcnt = 1; 880 aiov.iov_base = (caddr_t)&dq->dq_dqb; 881 aiov.iov_len = sizeof (struct ufs_dqblk); 882 auio.uio_resid = sizeof (struct ufs_dqblk); 883 auio.uio_offset = (off_t)(dq->dq_id * sizeof (struct ufs_dqblk)); 884 auio.uio_segflg = UIO_SYSSPACE; 885 auio.uio_rw = UIO_WRITE; 886 auio.uio_td = NULL; 887 error = VOP_WRITE(dqvp, &auio, 0, dq->dq_ump->um_cred[dq->dq_type]); 888 if (auio.uio_resid && error == 0) 889 error = EIO; 890 if (dq->dq_flags & DQ_WANT) 891 wakeup((caddr_t)dq); 892 dq->dq_flags &= ~(DQ_MOD|DQ_LOCK|DQ_WANT); 893 if (vp != dqvp) 894 VOP_UNLOCK(dqvp, 0); 895 return (error); 896 } 897 898 /* 899 * Flush all entries from the cache for a particular vnode. 900 */ 901 static void 902 ufs_dqflush(struct vnode *vp) 903 { 904 struct ufs_dquot *dq, *nextdq; 905 struct ufs_dqhash *dqh; 906 907 /* 908 * Move all dquot's that used to refer to this quota 909 * file off their hash chains (they will eventually 910 * fall off the head of the free list and be re-used). 911 */ 912 for (dqh = &ufs_dqhashtbl[ufs_dqhash]; dqh >= ufs_dqhashtbl; dqh--) { 913 for (dq = dqh->lh_first; dq; dq = nextdq) { 914 nextdq = dq->dq_hash.le_next; 915 if (dq->dq_ump->um_quotas[dq->dq_type] != vp) 916 continue; 917 if (dq->dq_cnt) 918 panic("dqflush: stray dquot"); 919 LIST_REMOVE(dq, dq_hash); 920 dq->dq_ump = (struct ufsmount *)0; 921 } 922 } 923 } 924