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 1.27 2008/01/05 14:02:41 swildner 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 static void ufs_quotawarn(struct ufs_dquot *dq); 70 71 #ifdef DIAGNOSTIC 72 static void ufs_dqref (struct ufs_dquot *); 73 static void ufs_chkdquot (struct inode *); 74 #endif 75 76 /* 77 * Set up the quotas for an inode. 78 * 79 * This routine completely defines the semantics of quotas. 80 * If other criterion want to be used to establish quotas, the 81 * MAXQUOTAS value in quotas.h should be increased, and the 82 * additional dquots set up here. 83 */ 84 int 85 ufs_getinoquota(struct inode *ip) 86 { 87 struct ufsmount *ump; 88 struct vnode *vp = ITOV(ip); 89 int error; 90 91 ump = VFSTOUFS(vp->v_mount); 92 /* 93 * Set up the user quota based on file uid. 94 * EINVAL means that quotas are not enabled. 95 */ 96 if (ip->i_dquot[USRQUOTA] == NODQUOT && 97 (error = ufs_dqget(vp, ip->i_uid, ump, USRQUOTA, &ip->i_dquot[USRQUOTA])) && 98 error != EINVAL) 99 return (error); 100 /* 101 * Set up the group quota based on file gid. 102 * EINVAL means that quotas are not enabled. 103 */ 104 if (ip->i_dquot[GRPQUOTA] == NODQUOT && 105 (error = ufs_dqget(vp, ip->i_gid, ump, GRPQUOTA, &ip->i_dquot[GRPQUOTA])) && 106 error != EINVAL) 107 return (error); 108 return (0); 109 } 110 111 /* 112 * Update disk usage, and take corrective action. 113 */ 114 int 115 ufs_chkdq(struct inode *ip, long change, struct ucred *cred, int flags) 116 { 117 struct ufs_dquot *dq; 118 int i; 119 int ncurblocks, error; 120 121 #ifdef DIAGNOSTIC 122 if ((flags & CHOWN) == 0) 123 ufs_chkdquot(ip); 124 #endif 125 if (change == 0) 126 return (0); 127 if (change < 0) { 128 for (i = 0; i < MAXQUOTAS; i++) { 129 if ((dq = ip->i_dquot[i]) == NODQUOT) 130 continue; 131 if (dq->dq_ump->um_quotas[dq->dq_type] == ip->i_vnode) { 132 ufs_quotawarn(dq); 133 continue; 134 } 135 while (dq->dq_flags & DQ_LOCK) { 136 dq->dq_flags |= DQ_WANT; 137 (void) tsleep((caddr_t)dq, 0, "chkdq1", 0); 138 } 139 ncurblocks = dq->dq_curblocks + change; 140 if (ncurblocks >= 0) 141 dq->dq_curblocks = ncurblocks; 142 else 143 dq->dq_curblocks = 0; 144 dq->dq_flags &= ~DQ_BLKS; 145 dq->dq_flags |= DQ_MOD; 146 } 147 return (0); 148 } 149 if ((flags & FORCE) == 0 && cred->cr_uid != 0) { 150 for (i = 0; i < MAXQUOTAS; i++) { 151 if ((dq = ip->i_dquot[i]) == NODQUOT) 152 continue; 153 if (dq->dq_ump->um_quotas[dq->dq_type] == ip->i_vnode) { 154 ufs_quotawarn(dq); 155 continue; 156 } 157 error = ufs_chkdqchg(ip, change, cred, i); 158 if (error) 159 return (error); 160 } 161 } 162 for (i = 0; i < MAXQUOTAS; i++) { 163 if ((dq = ip->i_dquot[i]) == NODQUOT) 164 continue; 165 if (dq->dq_ump->um_quotas[dq->dq_type] == ip->i_vnode) { 166 ufs_quotawarn(dq); 167 continue; 168 } 169 while (dq->dq_flags & DQ_LOCK) { 170 dq->dq_flags |= DQ_WANT; 171 (void) tsleep((caddr_t)dq, 0, "chkdq2", 0); 172 } 173 /* Reset timer when crossing soft limit */ 174 if (dq->dq_curblocks + change >= dq->dq_bsoftlimit && 175 dq->dq_curblocks < dq->dq_bsoftlimit) 176 dq->dq_btime = time_second + 177 VFSTOUFS(ITOV(ip)->v_mount)->um_btime[i]; 178 dq->dq_curblocks += change; 179 dq->dq_flags |= DQ_MOD; 180 } 181 return (0); 182 } 183 184 /* 185 * Check for a valid change to a users allocation. 186 * Issue an error message if appropriate. 187 */ 188 static int 189 ufs_chkdqchg(struct inode *ip, long change, struct ucred *cred, int type) 190 { 191 struct ufs_dquot *dq = ip->i_dquot[type]; 192 long ncurblocks = dq->dq_curblocks + change; 193 194 /* 195 * If user would exceed their hard limit, disallow space allocation. 196 */ 197 if (ncurblocks >= dq->dq_bhardlimit && dq->dq_bhardlimit) { 198 if ((dq->dq_flags & DQ_BLKS) == 0 && 199 ip->i_uid == cred->cr_uid) { 200 uprintf("\n%s: write failed, %s disk limit reached\n", 201 ITOV(ip)->v_mount->mnt_stat.f_mntfromname, 202 quotatypes[type]); 203 dq->dq_flags |= DQ_BLKS; 204 } 205 return (EDQUOT); 206 } 207 /* 208 * If user is over their soft limit for too long, disallow space 209 * allocation. Reset time limit as they cross their soft limit. 210 */ 211 if (ncurblocks >= dq->dq_bsoftlimit && dq->dq_bsoftlimit) { 212 if (dq->dq_curblocks < dq->dq_bsoftlimit) { 213 dq->dq_btime = time_second + 214 VFSTOUFS(ITOV(ip)->v_mount)->um_btime[type]; 215 if (ip->i_uid == cred->cr_uid) 216 uprintf("\n%s: warning, %s %s\n", 217 ITOV(ip)->v_mount->mnt_stat.f_mntfromname, 218 quotatypes[type], "disk quota exceeded"); 219 return (0); 220 } 221 if (time_second > dq->dq_btime) { 222 if ((dq->dq_flags & DQ_BLKS) == 0 && 223 ip->i_uid == cred->cr_uid) { 224 uprintf("\n%s: write failed, %s %s\n", 225 ITOV(ip)->v_mount->mnt_stat.f_mntfromname, 226 quotatypes[type], 227 "disk quota exceeded for too long"); 228 dq->dq_flags |= DQ_BLKS; 229 } 230 return (EDQUOT); 231 } 232 } 233 return (0); 234 } 235 236 /* 237 * Check the inode limit, applying corrective action. 238 */ 239 int 240 ufs_chkiq(struct inode *ip, long change, struct ucred *cred, int flags) 241 { 242 struct ufs_dquot *dq; 243 int i; 244 int ncurinodes, error; 245 246 #ifdef DIAGNOSTIC 247 if ((flags & CHOWN) == 0) 248 ufs_chkdquot(ip); 249 #endif 250 if (change == 0) 251 return (0); 252 if (change < 0) { 253 for (i = 0; i < MAXQUOTAS; i++) { 254 if ((dq = ip->i_dquot[i]) == NODQUOT) 255 continue; 256 if (dq->dq_ump->um_quotas[dq->dq_type] == ip->i_vnode) { 257 ufs_quotawarn(dq); 258 continue; 259 } 260 while (dq->dq_flags & DQ_LOCK) { 261 dq->dq_flags |= DQ_WANT; 262 (void) tsleep((caddr_t)dq, 0, "chkiq1", 0); 263 } 264 ncurinodes = dq->dq_curinodes + change; 265 if (ncurinodes >= 0) 266 dq->dq_curinodes = ncurinodes; 267 else 268 dq->dq_curinodes = 0; 269 dq->dq_flags &= ~DQ_INODS; 270 dq->dq_flags |= DQ_MOD; 271 } 272 return (0); 273 } 274 if ((flags & FORCE) == 0 && cred->cr_uid != 0) { 275 for (i = 0; i < MAXQUOTAS; i++) { 276 if ((dq = ip->i_dquot[i]) == NODQUOT) 277 continue; 278 if (dq->dq_ump->um_quotas[dq->dq_type] == ip->i_vnode) { 279 ufs_quotawarn(dq); 280 continue; 281 } 282 error = ufs_chkiqchg(ip, change, cred, i); 283 if (error) 284 return (error); 285 } 286 } 287 for (i = 0; i < MAXQUOTAS; i++) { 288 if ((dq = ip->i_dquot[i]) == NODQUOT) 289 continue; 290 if (dq->dq_ump->um_quotas[dq->dq_type] == ip->i_vnode) { 291 ufs_quotawarn(dq); 292 continue; 293 } 294 while (dq->dq_flags & DQ_LOCK) { 295 dq->dq_flags |= DQ_WANT; 296 (void) tsleep((caddr_t)dq, 0, "chkiq2", 0); 297 } 298 /* Reset timer when crossing soft limit */ 299 if (dq->dq_curinodes + change >= dq->dq_isoftlimit && 300 dq->dq_curinodes < dq->dq_isoftlimit) 301 dq->dq_itime = time_second + 302 VFSTOUFS(ITOV(ip)->v_mount)->um_itime[i]; 303 dq->dq_curinodes += change; 304 dq->dq_flags |= DQ_MOD; 305 } 306 return (0); 307 } 308 309 /* 310 * Check for a valid change to a users allocation. 311 * Issue an error message if appropriate. 312 */ 313 static int 314 ufs_chkiqchg(struct inode *ip, long change, struct ucred *cred, int type) 315 { 316 struct ufs_dquot *dq = ip->i_dquot[type]; 317 long ncurinodes = dq->dq_curinodes + change; 318 319 /* 320 * If user would exceed their hard limit, disallow inode allocation. 321 */ 322 if (ncurinodes >= dq->dq_ihardlimit && dq->dq_ihardlimit) { 323 if ((dq->dq_flags & DQ_INODS) == 0 && 324 ip->i_uid == cred->cr_uid) { 325 uprintf("\n%s: write failed, %s inode limit reached\n", 326 ITOV(ip)->v_mount->mnt_stat.f_mntfromname, 327 quotatypes[type]); 328 dq->dq_flags |= DQ_INODS; 329 } 330 return (EDQUOT); 331 } 332 /* 333 * If user is over their soft limit for too long, disallow inode 334 * allocation. Reset time limit as they cross their soft limit. 335 */ 336 if (ncurinodes >= dq->dq_isoftlimit && dq->dq_isoftlimit) { 337 if (dq->dq_curinodes < dq->dq_isoftlimit) { 338 dq->dq_itime = time_second + 339 VFSTOUFS(ITOV(ip)->v_mount)->um_itime[type]; 340 if (ip->i_uid == cred->cr_uid) 341 uprintf("\n%s: warning, %s %s\n", 342 ITOV(ip)->v_mount->mnt_stat.f_mntfromname, 343 quotatypes[type], "inode quota exceeded"); 344 return (0); 345 } 346 if (time_second > dq->dq_itime) { 347 if ((dq->dq_flags & DQ_INODS) == 0 && 348 ip->i_uid == cred->cr_uid) { 349 uprintf("\n%s: write failed, %s %s\n", 350 ITOV(ip)->v_mount->mnt_stat.f_mntfromname, 351 quotatypes[type], 352 "inode quota exceeded for too long"); 353 dq->dq_flags |= DQ_INODS; 354 } 355 return (EDQUOT); 356 } 357 } 358 return (0); 359 } 360 361 /* 362 * To avoid a deadlock we disallow quota operations on the quota file itself. 363 * This generally means that quotacheck was not run on the filesystem. 364 */ 365 static 366 void 367 ufs_quotawarn(struct ufs_dquot *dq) 368 { 369 static int dqticks; 370 371 if (dqticks != ticks / hz) { 372 dqticks = ticks / hz; 373 uprintf("%s: warning, quota file expanded, quotacheck " 374 "was not run!\n", 375 dq->dq_ump->um_mountp->mnt_stat.f_mntfromname); 376 } 377 } 378 379 #ifdef DIAGNOSTIC 380 /* 381 * On filesystems with quotas enabled, it is an error for a file to change 382 * size and not to have a dquot structure associated with it. 383 */ 384 static void 385 ufs_chkdquot(struct inode *ip) 386 { 387 struct ufsmount *ump = VFSTOUFS(ITOV(ip)->v_mount); 388 int i; 389 390 for (i = 0; i < MAXQUOTAS; i++) { 391 if (ump->um_quotas[i] == NULLVP || 392 (ump->um_qflags[i] & (QTF_OPENING|QTF_CLOSING))) 393 continue; 394 if (ip->i_dquot[i] == NODQUOT) { 395 vprint("chkdquot: missing dquot", ITOV(ip)); 396 panic("chkdquot: missing dquot"); 397 } 398 } 399 } 400 #endif 401 402 /* 403 * Code to process quotactl commands. 404 */ 405 406 struct scaninfo { 407 int rescan; 408 int type; 409 }; 410 411 /* 412 * Q_QUOTAON - set up a quota file for a particular filesystem. 413 */ 414 static int ufs_quotaon_scan(struct mount *mp, struct vnode *vp, void *data); 415 416 int 417 ufs_quotaon(struct ucred *cred, struct mount *mp, int type, caddr_t fname) 418 { 419 struct ufsmount *ump = VFSTOUFS(mp); 420 struct vnode *vp, **vpp; 421 struct ufs_dquot *dq; 422 int error; 423 struct nlookupdata nd; 424 struct scaninfo scaninfo; 425 426 vpp = &ump->um_quotas[type]; 427 error = nlookup_init(&nd, fname, UIO_USERSPACE, NLC_FOLLOW|NLC_LOCKVP); 428 if (error == 0) 429 error = vn_open(&nd, NULL, FREAD|FWRITE, 0); 430 if (error == 0 && nd.nl_open_vp->v_type != VREG) 431 error = EACCES; 432 if (error) { 433 nlookup_done(&nd); 434 return (error); 435 } 436 vp = nd.nl_open_vp; 437 nd.nl_open_vp = NULL; 438 nlookup_done(&nd); 439 440 vn_unlock(vp); 441 if (*vpp != vp) 442 ufs_quotaoff(mp, type); 443 ump->um_qflags[type] |= QTF_OPENING; 444 mp->mnt_flag |= MNT_QUOTA; 445 vp->v_flag |= VSYSTEM; 446 *vpp = vp; 447 /* XXX release duplicate vp if *vpp == vp? */ 448 /* 449 * Save the credential of the process that turned on quotas. 450 * Set up the time limits for this quota. 451 */ 452 ump->um_cred[type] = crhold(cred); 453 ump->um_btime[type] = MAX_DQ_TIME; 454 ump->um_itime[type] = MAX_IQ_TIME; 455 if (ufs_dqget(NULLVP, 0, ump, type, &dq) == 0) { 456 if (dq->dq_btime > 0) 457 ump->um_btime[type] = dq->dq_btime; 458 if (dq->dq_itime > 0) 459 ump->um_itime[type] = dq->dq_itime; 460 ufs_dqrele(NULLVP, dq); 461 } 462 /* 463 * Search vnodes associated with this mount point, 464 * adding references to quota file being opened. 465 * NB: only need to add dquot's for inodes being modified. 466 */ 467 scaninfo.rescan = 1; 468 while (scaninfo.rescan) { 469 scaninfo.rescan = 0; 470 error = vmntvnodescan(mp, VMSC_GETVP, 471 NULL, ufs_quotaon_scan, &scaninfo); 472 if (error) 473 break; 474 } 475 ump->um_qflags[type] &= ~QTF_OPENING; 476 if (error) 477 ufs_quotaoff(mp, type); 478 return (error); 479 } 480 481 static int 482 ufs_quotaon_scan(struct mount *mp, struct vnode *vp, void *data) 483 { 484 int error; 485 /*struct scaninfo *info = data;*/ 486 487 if (vp->v_writecount == 0) 488 return(0); 489 error = ufs_getinoquota(VTOI(vp)); 490 return(error); 491 } 492 493 /* 494 * Q_QUOTAOFF - turn off disk quotas for a filesystem. 495 */ 496 497 static int ufs_quotaoff_scan(struct mount *mp, struct vnode *vp, void *data); 498 499 int 500 ufs_quotaoff(struct mount *mp, int type) 501 { 502 struct vnode *qvp; 503 struct ufsmount *ump = VFSTOUFS(mp); 504 int error; 505 struct scaninfo scaninfo; 506 507 if ((qvp = ump->um_quotas[type]) == NULLVP) 508 return (0); 509 ump->um_qflags[type] |= QTF_CLOSING; 510 511 /* 512 * Search vnodes associated with this mount point, 513 * deleting any references to quota file being closed. 514 */ 515 scaninfo.rescan = 1; 516 scaninfo.type = type; 517 while (scaninfo.rescan) { 518 scaninfo.rescan = 0; 519 vmntvnodescan(mp, VMSC_GETVP, NULL, ufs_quotaoff_scan, &scaninfo); 520 } 521 ufs_dqflush(qvp); 522 qvp->v_flag &= ~VSYSTEM; 523 error = vn_close(qvp, FREAD|FWRITE); 524 ump->um_quotas[type] = NULLVP; 525 crfree(ump->um_cred[type]); 526 ump->um_cred[type] = NOCRED; 527 ump->um_qflags[type] &= ~QTF_CLOSING; 528 for (type = 0; type < MAXQUOTAS; type++) { 529 if (ump->um_quotas[type] != NULLVP) 530 break; 531 } 532 if (type == MAXQUOTAS) 533 mp->mnt_flag &= ~MNT_QUOTA; 534 return (error); 535 } 536 537 static int 538 ufs_quotaoff_scan(struct mount *mp, struct vnode *vp, void *data) 539 { 540 struct scaninfo *info = data; 541 struct ufs_dquot *dq; 542 struct inode *ip; 543 544 if (vp->v_type == VNON) { 545 return(0); 546 } 547 ip = VTOI(vp); 548 dq = ip->i_dquot[info->type]; 549 ip->i_dquot[info->type] = NODQUOT; 550 ufs_dqrele(vp, dq); 551 return(0); 552 } 553 554 /* 555 * Q_GETQUOTA - return current values in a dqblk structure. 556 */ 557 int 558 ufs_getquota(struct mount *mp, u_long id, int type, caddr_t addr) 559 { 560 struct ufs_dquot *dq; 561 int error; 562 563 error = ufs_dqget(NULLVP, id, VFSTOUFS(mp), type, &dq); 564 if (error) 565 return (error); 566 error = copyout((caddr_t)&dq->dq_dqb, addr, sizeof (struct ufs_dqblk)); 567 ufs_dqrele(NULLVP, dq); 568 return (error); 569 } 570 571 /* 572 * Q_SETQUOTA - assign an entire dqblk structure. 573 */ 574 int 575 ufs_setquota(struct mount *mp, u_long id, int type, caddr_t addr) 576 { 577 struct ufs_dquot *dq; 578 struct ufs_dquot *ndq; 579 struct ufsmount *ump = VFSTOUFS(mp); 580 struct ufs_dqblk newlim; 581 int error; 582 583 error = copyin(addr, (caddr_t)&newlim, sizeof (struct ufs_dqblk)); 584 if (error) 585 return (error); 586 error = ufs_dqget(NULLVP, id, ump, type, &ndq); 587 if (error) 588 return (error); 589 dq = ndq; 590 while (dq->dq_flags & DQ_LOCK) { 591 dq->dq_flags |= DQ_WANT; 592 (void) tsleep((caddr_t)dq, 0, "setqta", 0); 593 } 594 /* 595 * Copy all but the current values. 596 * Reset time limit if previously had no soft limit or were 597 * under it, but now have a soft limit and are over it. 598 */ 599 newlim.dqb_curblocks = dq->dq_curblocks; 600 newlim.dqb_curinodes = dq->dq_curinodes; 601 if (dq->dq_id != 0) { 602 newlim.dqb_btime = dq->dq_btime; 603 newlim.dqb_itime = dq->dq_itime; 604 } 605 if (newlim.dqb_bsoftlimit && 606 dq->dq_curblocks >= newlim.dqb_bsoftlimit && 607 (dq->dq_bsoftlimit == 0 || dq->dq_curblocks < dq->dq_bsoftlimit)) 608 newlim.dqb_btime = time_second + ump->um_btime[type]; 609 if (newlim.dqb_isoftlimit && 610 dq->dq_curinodes >= newlim.dqb_isoftlimit && 611 (dq->dq_isoftlimit == 0 || dq->dq_curinodes < dq->dq_isoftlimit)) 612 newlim.dqb_itime = time_second + ump->um_itime[type]; 613 dq->dq_dqb = newlim; 614 if (dq->dq_curblocks < dq->dq_bsoftlimit) 615 dq->dq_flags &= ~DQ_BLKS; 616 if (dq->dq_curinodes < dq->dq_isoftlimit) 617 dq->dq_flags &= ~DQ_INODS; 618 if (dq->dq_isoftlimit == 0 && dq->dq_bsoftlimit == 0 && 619 dq->dq_ihardlimit == 0 && dq->dq_bhardlimit == 0) 620 dq->dq_flags |= DQ_FAKE; 621 else 622 dq->dq_flags &= ~DQ_FAKE; 623 dq->dq_flags |= DQ_MOD; 624 ufs_dqrele(NULLVP, dq); 625 return (0); 626 } 627 628 /* 629 * Q_SETUSE - set current inode and block usage. 630 */ 631 int 632 ufs_setuse(struct mount *mp, u_long id, int type, caddr_t addr) 633 { 634 struct ufs_dquot *dq; 635 struct ufsmount *ump = VFSTOUFS(mp); 636 struct ufs_dquot *ndq; 637 struct ufs_dqblk usage; 638 int error; 639 640 error = copyin(addr, (caddr_t)&usage, sizeof (struct ufs_dqblk)); 641 if (error) 642 return (error); 643 error = ufs_dqget(NULLVP, id, ump, type, &ndq); 644 if (error) 645 return (error); 646 dq = ndq; 647 while (dq->dq_flags & DQ_LOCK) { 648 dq->dq_flags |= DQ_WANT; 649 (void) tsleep((caddr_t)dq, 0, "setuse", 0); 650 } 651 /* 652 * Reset time limit if have a soft limit and were 653 * previously under it, but are now over it. 654 */ 655 if (dq->dq_bsoftlimit && dq->dq_curblocks < dq->dq_bsoftlimit && 656 usage.dqb_curblocks >= dq->dq_bsoftlimit) 657 dq->dq_btime = time_second + ump->um_btime[type]; 658 if (dq->dq_isoftlimit && dq->dq_curinodes < dq->dq_isoftlimit && 659 usage.dqb_curinodes >= dq->dq_isoftlimit) 660 dq->dq_itime = time_second + ump->um_itime[type]; 661 dq->dq_curblocks = usage.dqb_curblocks; 662 dq->dq_curinodes = usage.dqb_curinodes; 663 if (dq->dq_curblocks < dq->dq_bsoftlimit) 664 dq->dq_flags &= ~DQ_BLKS; 665 if (dq->dq_curinodes < dq->dq_isoftlimit) 666 dq->dq_flags &= ~DQ_INODS; 667 dq->dq_flags |= DQ_MOD; 668 ufs_dqrele(NULLVP, dq); 669 return (0); 670 } 671 672 /* 673 * Q_SYNC - sync quota files to disk. 674 */ 675 676 static int ufs_qsync_scan(struct mount *mp, struct vnode *vp, void *data); 677 678 int 679 ufs_qsync(struct mount *mp) 680 { 681 struct ufsmount *ump = VFSTOUFS(mp); 682 struct scaninfo scaninfo; 683 int i; 684 685 /* 686 * Check if the mount point has any quotas. 687 * If not, simply return. 688 */ 689 for (i = 0; i < MAXQUOTAS; i++) 690 if (ump->um_quotas[i] != NULLVP) 691 break; 692 if (i == MAXQUOTAS) 693 return (0); 694 /* 695 * Search vnodes associated with this mount point, 696 * synchronizing any modified ufs_dquot structures. 697 */ 698 scaninfo.rescan = 1; 699 while (scaninfo.rescan) { 700 scaninfo.rescan = 0; 701 vmntvnodescan(mp, VMSC_GETVP|VMSC_NOWAIT, 702 NULL, ufs_qsync_scan, &scaninfo); 703 } 704 return (0); 705 } 706 707 static int 708 ufs_qsync_scan(struct mount *mp, struct vnode *vp, void *data) 709 { 710 /*struct scaninfo *info = data;*/ 711 struct ufs_dquot *dq; 712 /* int error;*/ 713 int i; 714 715 for (i = 0; i < MAXQUOTAS; i++) { 716 dq = VTOI(vp)->i_dquot[i]; 717 if (dq != NODQUOT && (dq->dq_flags & DQ_MOD)) 718 ufs_dqsync(vp, dq); 719 } 720 return(0); 721 } 722 723 /* 724 * Code pertaining to management of the in-core dquot data structures. 725 */ 726 #define DQHASH(dqvp, id) \ 727 (&ufs_dqhashtbl[((((intptr_t)(dqvp)) >> 8) + id) & ufs_dqhash]) 728 static LIST_HEAD(ufs_dqhash, ufs_dquot) *ufs_dqhashtbl; 729 static u_long ufs_dqhash; 730 731 /* 732 * Dquot free list. 733 */ 734 #define DQUOTINC 5 /* minimum free dquots desired */ 735 static TAILQ_HEAD(ufs_dqfreelist, ufs_dquot) ufs_dqfreelist; 736 static long ufs_numdquot, ufs_desireddquot = DQUOTINC; 737 738 /* 739 * Initialize the quota system. 740 */ 741 void 742 ufs_dqinit(void) 743 { 744 ufs_dqhashtbl = hashinit(desiredvnodes, M_DQUOT, &ufs_dqhash); 745 TAILQ_INIT(&ufs_dqfreelist); 746 } 747 748 /* 749 * Obtain a dquot structure for the specified identifier and quota file 750 * reading the information from the file if necessary. 751 */ 752 static int 753 ufs_dqget(struct vnode *vp, u_long id, struct ufsmount *ump, int type, 754 struct ufs_dquot **dqp) 755 { 756 struct ufs_dquot *dq; 757 struct ufs_dqhash *dqh; 758 struct vnode *dqvp; 759 struct iovec aiov; 760 struct uio auio; 761 int error; 762 763 dqvp = ump->um_quotas[type]; 764 if (dqvp == NULLVP || (ump->um_qflags[type] & QTF_CLOSING)) { 765 *dqp = NODQUOT; 766 return (EINVAL); 767 } 768 /* 769 * Check the cache first. 770 */ 771 dqh = DQHASH(dqvp, id); 772 for (dq = dqh->lh_first; dq; dq = dq->dq_hash.le_next) { 773 if (dq->dq_id != id || 774 dq->dq_ump->um_quotas[dq->dq_type] != dqvp) 775 continue; 776 /* 777 * Cache hit with no references. Take 778 * the structure off the free list. 779 */ 780 if (dq->dq_cnt == 0) 781 TAILQ_REMOVE(&ufs_dqfreelist, dq, dq_freelist); 782 DQREF(dq); 783 *dqp = dq; 784 return (0); 785 } 786 /* 787 * Not in cache, allocate a new one. 788 */ 789 if (TAILQ_EMPTY(&ufs_dqfreelist) && ufs_numdquot < MAXQUOTAS * desiredvnodes) 790 ufs_desireddquot += DQUOTINC; 791 if (ufs_numdquot < ufs_desireddquot) { 792 dq = (struct ufs_dquot *) 793 kmalloc(sizeof *dq, M_DQUOT, M_WAITOK | M_ZERO); 794 ufs_numdquot++; 795 } else { 796 if ((dq = TAILQ_FIRST(&ufs_dqfreelist)) == NULL) { 797 tablefull("dquot"); 798 *dqp = NODQUOT; 799 return (EUSERS); 800 } 801 if (dq->dq_cnt || (dq->dq_flags & DQ_MOD)) 802 panic("dqget: free dquot isn't"); 803 TAILQ_REMOVE(&ufs_dqfreelist, dq, dq_freelist); 804 if (dq->dq_ump != NULL) 805 LIST_REMOVE(dq, dq_hash); 806 } 807 /* 808 * Initialize the contents of the dquot structure. 809 */ 810 if (vp != dqvp) 811 vn_lock(dqvp, LK_EXCLUSIVE | LK_RETRY); 812 LIST_INSERT_HEAD(dqh, dq, dq_hash); 813 DQREF(dq); 814 dq->dq_flags = DQ_LOCK; 815 dq->dq_id = id; 816 dq->dq_ump = ump; 817 dq->dq_type = type; 818 auio.uio_iov = &aiov; 819 auio.uio_iovcnt = 1; 820 aiov.iov_base = (caddr_t)&dq->dq_dqb; 821 aiov.iov_len = sizeof (struct ufs_dqblk); 822 auio.uio_resid = sizeof (struct ufs_dqblk); 823 auio.uio_offset = (off_t)(id * sizeof (struct ufs_dqblk)); 824 auio.uio_segflg = UIO_SYSSPACE; 825 auio.uio_rw = UIO_READ; 826 auio.uio_td = NULL; 827 error = VOP_READ(dqvp, &auio, 0, ump->um_cred[type]); 828 if (auio.uio_resid == sizeof(struct ufs_dqblk) && error == 0) 829 bzero((caddr_t)&dq->dq_dqb, sizeof(struct ufs_dqblk)); 830 if (vp != dqvp) 831 vn_unlock(dqvp); 832 if (dq->dq_flags & DQ_WANT) 833 wakeup((caddr_t)dq); 834 dq->dq_flags = 0; 835 /* 836 * I/O error in reading quota file, release 837 * quota structure and reflect problem to caller. 838 */ 839 if (error) { 840 LIST_REMOVE(dq, dq_hash); 841 ufs_dqrele(vp, dq); 842 *dqp = NODQUOT; 843 return (error); 844 } 845 /* 846 * Check for no limit to enforce. 847 * Initialize time values if necessary. 848 */ 849 if (dq->dq_isoftlimit == 0 && dq->dq_bsoftlimit == 0 && 850 dq->dq_ihardlimit == 0 && dq->dq_bhardlimit == 0) 851 dq->dq_flags |= DQ_FAKE; 852 if (dq->dq_id != 0) { 853 if (dq->dq_btime == 0) 854 dq->dq_btime = time_second + ump->um_btime[type]; 855 if (dq->dq_itime == 0) 856 dq->dq_itime = time_second + ump->um_itime[type]; 857 } 858 *dqp = dq; 859 return (0); 860 } 861 862 #ifdef DIAGNOSTIC 863 /* 864 * Obtain a reference to a dquot. 865 */ 866 static void 867 ufs_dqref(struct ufs_dquot *dq) 868 { 869 dq->dq_cnt++; 870 } 871 #endif 872 873 /* 874 * Release a reference to a dquot. 875 */ 876 void 877 ufs_dqrele(struct vnode *vp, struct ufs_dquot *dq) 878 { 879 if (dq == NODQUOT) 880 return; 881 if (dq->dq_cnt > 1) { 882 dq->dq_cnt--; 883 return; 884 } 885 if (dq->dq_flags & DQ_MOD) 886 (void)ufs_dqsync(vp, dq); 887 if (--dq->dq_cnt > 0) 888 return; 889 TAILQ_INSERT_TAIL(&ufs_dqfreelist, dq, dq_freelist); 890 } 891 892 /* 893 * Update the disk quota in the quota file. 894 */ 895 static int 896 ufs_dqsync(struct vnode *vp, struct ufs_dquot *dq) 897 { 898 struct vnode *dqvp; 899 struct iovec aiov; 900 struct uio auio; 901 int error; 902 903 if (dq == NODQUOT) 904 panic("dqsync: dquot"); 905 if ((dq->dq_flags & DQ_MOD) == 0) 906 return (0); 907 if ((dqvp = dq->dq_ump->um_quotas[dq->dq_type]) == NULLVP) 908 panic("dqsync: file"); 909 if (vp != dqvp) 910 vn_lock(dqvp, LK_EXCLUSIVE | LK_RETRY); 911 while (dq->dq_flags & DQ_LOCK) { 912 dq->dq_flags |= DQ_WANT; 913 (void) tsleep((caddr_t)dq, 0, "dqsync", 0); 914 if ((dq->dq_flags & DQ_MOD) == 0) { 915 if (vp != dqvp) 916 vn_unlock(dqvp); 917 return (0); 918 } 919 } 920 dq->dq_flags |= DQ_LOCK; 921 auio.uio_iov = &aiov; 922 auio.uio_iovcnt = 1; 923 aiov.iov_base = (caddr_t)&dq->dq_dqb; 924 aiov.iov_len = sizeof (struct ufs_dqblk); 925 auio.uio_resid = sizeof (struct ufs_dqblk); 926 auio.uio_offset = (off_t)(dq->dq_id * sizeof (struct ufs_dqblk)); 927 auio.uio_segflg = UIO_SYSSPACE; 928 auio.uio_rw = UIO_WRITE; 929 auio.uio_td = NULL; 930 error = VOP_WRITE(dqvp, &auio, 0, dq->dq_ump->um_cred[dq->dq_type]); 931 if (auio.uio_resid && error == 0) 932 error = EIO; 933 if (dq->dq_flags & DQ_WANT) 934 wakeup((caddr_t)dq); 935 dq->dq_flags &= ~(DQ_MOD|DQ_LOCK|DQ_WANT); 936 if (vp != dqvp) 937 vn_unlock(dqvp); 938 return (error); 939 } 940 941 /* 942 * Flush all entries from the cache for a particular vnode. 943 */ 944 static void 945 ufs_dqflush(struct vnode *vp) 946 { 947 struct ufs_dquot *dq, *nextdq; 948 struct ufs_dqhash *dqh; 949 950 /* 951 * Move all dquot's that used to refer to this quota 952 * file off their hash chains (they will eventually 953 * fall off the head of the free list and be re-used). 954 */ 955 for (dqh = &ufs_dqhashtbl[ufs_dqhash]; dqh >= ufs_dqhashtbl; dqh--) { 956 for (dq = dqh->lh_first; dq; dq = nextdq) { 957 nextdq = dq->dq_hash.le_next; 958 if (dq->dq_ump->um_quotas[dq->dq_type] != vp) 959 continue; 960 if (dq->dq_cnt) 961 panic("dqflush: stray dquot"); 962 LIST_REMOVE(dq, dq_hash); 963 dq->dq_ump = NULL; 964 } 965 } 966 } 967