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 * 4. Neither the name of the University nor the names of its contributors 17 * may be used to endorse or promote products derived from this software 18 * without specific prior written permission. 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 23 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 30 * SUCH DAMAGE. 31 * 32 * @(#)ufs_quota.c 8.5 (Berkeley) 5/20/95 33 */ 34 35#include <sys/cdefs.h> 36__FBSDID("$FreeBSD: stable/10/sys/ufs/ufs/ufs_quota.c 306178 2016-09-22 10:47:56Z kib $"); 37 38#include "opt_ffs.h" 39 40#include <sys/param.h> 41#include <sys/systm.h> 42#include <sys/endian.h> 43#include <sys/fcntl.h> 44#include <sys/kernel.h> 45#include <sys/lock.h> 46#include <sys/malloc.h> 47#include <sys/mount.h> 48#include <sys/mutex.h> 49#include <sys/namei.h> 50#include <sys/priv.h> 51#include <sys/proc.h> 52#include <sys/socket.h> 53#include <sys/stat.h> 54#include <sys/sysctl.h> 55#include <sys/vnode.h> 56 57#include <ufs/ufs/extattr.h> 58#include <ufs/ufs/quota.h> 59#include <ufs/ufs/inode.h> 60#include <ufs/ufs/ufsmount.h> 61#include <ufs/ufs/ufs_extern.h> 62 63CTASSERT(sizeof(struct dqblk64) == sizeof(struct dqhdr64)); 64 65static int unprivileged_get_quota = 0; 66SYSCTL_INT(_security_bsd, OID_AUTO, unprivileged_get_quota, CTLFLAG_RW, 67 &unprivileged_get_quota, 0, 68 "Unprivileged processes may retrieve quotas for other uids and gids"); 69 70static MALLOC_DEFINE(M_DQUOT, "ufs_quota", "UFS quota entries"); 71 72/* 73 * Quota name to error message mapping. 74 */ 75static char *quotatypes[] = INITQFNAMES; 76 77static int chkdqchg(struct inode *, ufs2_daddr_t, struct ucred *, int, int *); 78static int chkiqchg(struct inode *, int, struct ucred *, int, int *); 79static int dqopen(struct vnode *, struct ufsmount *, int); 80static int dqget(struct vnode *, 81 u_long, struct ufsmount *, int, struct dquot **); 82static int dqsync(struct vnode *, struct dquot *); 83static int dqflush(struct vnode *); 84static int quotaoff1(struct thread *td, struct mount *mp, int type); 85static int quotaoff_inchange(struct thread *td, struct mount *mp, int type); 86 87/* conversion functions - from_to() */ 88static void dqb32_dq(const struct dqblk32 *, struct dquot *); 89static void dqb64_dq(const struct dqblk64 *, struct dquot *); 90static void dq_dqb32(const struct dquot *, struct dqblk32 *); 91static void dq_dqb64(const struct dquot *, struct dqblk64 *); 92static void dqb32_dqb64(const struct dqblk32 *, struct dqblk64 *); 93static void dqb64_dqb32(const struct dqblk64 *, struct dqblk32 *); 94 95#ifdef DIAGNOSTIC 96static void dqref(struct dquot *); 97static void chkdquot(struct inode *); 98#endif 99 100/* 101 * Set up the quotas for an inode. 102 * 103 * This routine completely defines the semantics of quotas. 104 * If other criterion want to be used to establish quotas, the 105 * MAXQUOTAS value in quota.h should be increased, and the 106 * additional dquots set up here. 107 */ 108int 109getinoquota(struct inode *ip) 110{ 111 struct ufsmount *ump; 112 struct vnode *vp; 113 int error; 114 115 vp = ITOV(ip); 116 117 /* 118 * Disk quotas must be turned off for system files. Currently 119 * snapshot and quota files. 120 */ 121 if ((vp->v_vflag & VV_SYSTEM) != 0) 122 return (0); 123 /* 124 * XXX: Turn off quotas for files with a negative UID or GID. 125 * This prevents the creation of 100GB+ quota files. 126 */ 127 if ((int)ip->i_uid < 0 || (int)ip->i_gid < 0) 128 return (0); 129 ump = VFSTOUFS(vp->v_mount); 130 /* 131 * Set up the user quota based on file uid. 132 * EINVAL means that quotas are not enabled. 133 */ 134 if ((error = 135 dqget(vp, ip->i_uid, ump, USRQUOTA, &ip->i_dquot[USRQUOTA])) && 136 error != EINVAL) 137 return (error); 138 /* 139 * Set up the group quota based on file gid. 140 * EINVAL means that quotas are not enabled. 141 */ 142 if ((error = 143 dqget(vp, ip->i_gid, ump, GRPQUOTA, &ip->i_dquot[GRPQUOTA])) && 144 error != EINVAL) 145 return (error); 146 return (0); 147} 148 149/* 150 * Update disk usage, and take corrective action. 151 */ 152int 153chkdq(struct inode *ip, ufs2_daddr_t change, struct ucred *cred, int flags) 154{ 155 struct dquot *dq; 156 ufs2_daddr_t ncurblocks; 157 struct vnode *vp = ITOV(ip); 158 int i, error, warn, do_check; 159 160 /* 161 * Disk quotas must be turned off for system files. Currently 162 * snapshot and quota files. 163 */ 164 if ((vp->v_vflag & VV_SYSTEM) != 0) 165 return (0); 166 /* 167 * XXX: Turn off quotas for files with a negative UID or GID. 168 * This prevents the creation of 100GB+ quota files. 169 */ 170 if ((int)ip->i_uid < 0 || (int)ip->i_gid < 0) 171 return (0); 172#ifdef DIAGNOSTIC 173 if ((flags & CHOWN) == 0) 174 chkdquot(ip); 175#endif 176 if (change == 0) 177 return (0); 178 if (change < 0) { 179 for (i = 0; i < MAXQUOTAS; i++) { 180 if ((dq = ip->i_dquot[i]) == NODQUOT) 181 continue; 182 DQI_LOCK(dq); 183 DQI_WAIT(dq, PINOD+1, "chkdq1"); 184 ncurblocks = dq->dq_curblocks + change; 185 if (ncurblocks >= 0) 186 dq->dq_curblocks = ncurblocks; 187 else 188 dq->dq_curblocks = 0; 189 dq->dq_flags &= ~DQ_BLKS; 190 dq->dq_flags |= DQ_MOD; 191 DQI_UNLOCK(dq); 192 } 193 return (0); 194 } 195 if ((flags & FORCE) == 0 && 196 priv_check_cred(cred, PRIV_VFS_EXCEEDQUOTA, 0)) 197 do_check = 1; 198 else 199 do_check = 0; 200 for (i = 0; i < MAXQUOTAS; i++) { 201 if ((dq = ip->i_dquot[i]) == NODQUOT) 202 continue; 203 warn = 0; 204 DQI_LOCK(dq); 205 DQI_WAIT(dq, PINOD+1, "chkdq2"); 206 if (do_check) { 207 error = chkdqchg(ip, change, cred, i, &warn); 208 if (error) { 209 /* 210 * Roll back user quota changes when 211 * group quota failed. 212 */ 213 while (i > 0) { 214 --i; 215 dq = ip->i_dquot[i]; 216 if (dq == NODQUOT) 217 continue; 218 DQI_LOCK(dq); 219 DQI_WAIT(dq, PINOD+1, "chkdq3"); 220 ncurblocks = dq->dq_curblocks - change; 221 if (ncurblocks >= 0) 222 dq->dq_curblocks = ncurblocks; 223 else 224 dq->dq_curblocks = 0; 225 dq->dq_flags &= ~DQ_BLKS; 226 dq->dq_flags |= DQ_MOD; 227 DQI_UNLOCK(dq); 228 } 229 return (error); 230 } 231 } 232 /* Reset timer when crossing soft limit */ 233 if (dq->dq_curblocks + change >= dq->dq_bsoftlimit && 234 dq->dq_curblocks < dq->dq_bsoftlimit) 235 dq->dq_btime = time_second + ip->i_ump->um_btime[i]; 236 dq->dq_curblocks += change; 237 dq->dq_flags |= DQ_MOD; 238 DQI_UNLOCK(dq); 239 if (warn) 240 uprintf("\n%s: warning, %s disk quota exceeded\n", 241 ITOV(ip)->v_mount->mnt_stat.f_mntonname, 242 quotatypes[i]); 243 } 244 return (0); 245} 246 247/* 248 * Check for a valid change to a users allocation. 249 * Issue an error message if appropriate. 250 */ 251static int 252chkdqchg(struct inode *ip, ufs2_daddr_t change, struct ucred *cred, 253 int type, int *warn) 254{ 255 struct dquot *dq = ip->i_dquot[type]; 256 ufs2_daddr_t ncurblocks = dq->dq_curblocks + change; 257 258 /* 259 * If user would exceed their hard limit, disallow space allocation. 260 */ 261 if (ncurblocks >= dq->dq_bhardlimit && dq->dq_bhardlimit) { 262 if ((dq->dq_flags & DQ_BLKS) == 0 && 263 ip->i_uid == cred->cr_uid) { 264 dq->dq_flags |= DQ_BLKS; 265 DQI_UNLOCK(dq); 266 uprintf("\n%s: write failed, %s disk limit reached\n", 267 ITOV(ip)->v_mount->mnt_stat.f_mntonname, 268 quotatypes[type]); 269 return (EDQUOT); 270 } 271 DQI_UNLOCK(dq); 272 return (EDQUOT); 273 } 274 /* 275 * If user is over their soft limit for too long, disallow space 276 * allocation. Reset time limit as they cross their soft limit. 277 */ 278 if (ncurblocks >= dq->dq_bsoftlimit && dq->dq_bsoftlimit) { 279 if (dq->dq_curblocks < dq->dq_bsoftlimit) { 280 dq->dq_btime = time_second + ip->i_ump->um_btime[type]; 281 if (ip->i_uid == cred->cr_uid) 282 *warn = 1; 283 return (0); 284 } 285 if (time_second > dq->dq_btime) { 286 if ((dq->dq_flags & DQ_BLKS) == 0 && 287 ip->i_uid == cred->cr_uid) { 288 dq->dq_flags |= DQ_BLKS; 289 DQI_UNLOCK(dq); 290 uprintf("\n%s: write failed, %s " 291 "disk quota exceeded for too long\n", 292 ITOV(ip)->v_mount->mnt_stat.f_mntonname, 293 quotatypes[type]); 294 return (EDQUOT); 295 } 296 DQI_UNLOCK(dq); 297 return (EDQUOT); 298 } 299 } 300 return (0); 301} 302 303/* 304 * Check the inode limit, applying corrective action. 305 */ 306int 307chkiq(struct inode *ip, int change, struct ucred *cred, int flags) 308{ 309 struct dquot *dq; 310 int i, error, warn, do_check; 311 312#ifdef DIAGNOSTIC 313 if ((flags & CHOWN) == 0) 314 chkdquot(ip); 315#endif 316 if (change == 0) 317 return (0); 318 if (change < 0) { 319 for (i = 0; i < MAXQUOTAS; i++) { 320 if ((dq = ip->i_dquot[i]) == NODQUOT) 321 continue; 322 DQI_LOCK(dq); 323 DQI_WAIT(dq, PINOD+1, "chkiq1"); 324 if (dq->dq_curinodes >= -change) 325 dq->dq_curinodes += change; 326 else 327 dq->dq_curinodes = 0; 328 dq->dq_flags &= ~DQ_INODS; 329 dq->dq_flags |= DQ_MOD; 330 DQI_UNLOCK(dq); 331 } 332 return (0); 333 } 334 if ((flags & FORCE) == 0 && 335 priv_check_cred(cred, PRIV_VFS_EXCEEDQUOTA, 0)) 336 do_check = 1; 337 else 338 do_check = 0; 339 for (i = 0; i < MAXQUOTAS; i++) { 340 if ((dq = ip->i_dquot[i]) == NODQUOT) 341 continue; 342 warn = 0; 343 DQI_LOCK(dq); 344 DQI_WAIT(dq, PINOD+1, "chkiq2"); 345 if (do_check) { 346 error = chkiqchg(ip, change, cred, i, &warn); 347 if (error) { 348 /* 349 * Roll back user quota changes when 350 * group quota failed. 351 */ 352 while (i > 0) { 353 --i; 354 dq = ip->i_dquot[i]; 355 if (dq == NODQUOT) 356 continue; 357 DQI_LOCK(dq); 358 DQI_WAIT(dq, PINOD+1, "chkiq3"); 359 if (dq->dq_curinodes >= change) 360 dq->dq_curinodes -= change; 361 else 362 dq->dq_curinodes = 0; 363 dq->dq_flags &= ~DQ_INODS; 364 dq->dq_flags |= DQ_MOD; 365 DQI_UNLOCK(dq); 366 } 367 return (error); 368 } 369 } 370 /* Reset timer when crossing soft limit */ 371 if (dq->dq_curinodes + change >= dq->dq_isoftlimit && 372 dq->dq_curinodes < dq->dq_isoftlimit) 373 dq->dq_itime = time_second + ip->i_ump->um_itime[i]; 374 dq->dq_curinodes += change; 375 dq->dq_flags |= DQ_MOD; 376 DQI_UNLOCK(dq); 377 if (warn) 378 uprintf("\n%s: warning, %s inode quota exceeded\n", 379 ITOV(ip)->v_mount->mnt_stat.f_mntonname, 380 quotatypes[i]); 381 } 382 return (0); 383} 384 385/* 386 * Check for a valid change to a users allocation. 387 * Issue an error message if appropriate. 388 */ 389static int 390chkiqchg(struct inode *ip, int change, struct ucred *cred, int type, int *warn) 391{ 392 struct dquot *dq = ip->i_dquot[type]; 393 ino_t ncurinodes = dq->dq_curinodes + change; 394 395 /* 396 * If user would exceed their hard limit, disallow inode allocation. 397 */ 398 if (ncurinodes >= dq->dq_ihardlimit && dq->dq_ihardlimit) { 399 if ((dq->dq_flags & DQ_INODS) == 0 && 400 ip->i_uid == cred->cr_uid) { 401 dq->dq_flags |= DQ_INODS; 402 DQI_UNLOCK(dq); 403 uprintf("\n%s: write failed, %s inode limit reached\n", 404 ITOV(ip)->v_mount->mnt_stat.f_mntonname, 405 quotatypes[type]); 406 return (EDQUOT); 407 } 408 DQI_UNLOCK(dq); 409 return (EDQUOT); 410 } 411 /* 412 * If user is over their soft limit for too long, disallow inode 413 * allocation. Reset time limit as they cross their soft limit. 414 */ 415 if (ncurinodes >= dq->dq_isoftlimit && dq->dq_isoftlimit) { 416 if (dq->dq_curinodes < dq->dq_isoftlimit) { 417 dq->dq_itime = time_second + ip->i_ump->um_itime[type]; 418 if (ip->i_uid == cred->cr_uid) 419 *warn = 1; 420 return (0); 421 } 422 if (time_second > dq->dq_itime) { 423 if ((dq->dq_flags & DQ_INODS) == 0 && 424 ip->i_uid == cred->cr_uid) { 425 dq->dq_flags |= DQ_INODS; 426 DQI_UNLOCK(dq); 427 uprintf("\n%s: write failed, %s " 428 "inode quota exceeded for too long\n", 429 ITOV(ip)->v_mount->mnt_stat.f_mntonname, 430 quotatypes[type]); 431 return (EDQUOT); 432 } 433 DQI_UNLOCK(dq); 434 return (EDQUOT); 435 } 436 } 437 return (0); 438} 439 440#ifdef DIAGNOSTIC 441/* 442 * On filesystems with quotas enabled, it is an error for a file to change 443 * size and not to have a dquot structure associated with it. 444 */ 445static void 446chkdquot(struct inode *ip) 447{ 448 struct ufsmount *ump = ip->i_ump; 449 struct vnode *vp = ITOV(ip); 450 int i; 451 452 /* 453 * Disk quotas must be turned off for system files. Currently 454 * these are snapshots and quota files. 455 */ 456 if ((vp->v_vflag & VV_SYSTEM) != 0) 457 return; 458 /* 459 * XXX: Turn off quotas for files with a negative UID or GID. 460 * This prevents the creation of 100GB+ quota files. 461 */ 462 if ((int)ip->i_uid < 0 || (int)ip->i_gid < 0) 463 return; 464 465 UFS_LOCK(ump); 466 for (i = 0; i < MAXQUOTAS; i++) { 467 if (ump->um_quotas[i] == NULLVP || 468 (ump->um_qflags[i] & (QTF_OPENING|QTF_CLOSING))) 469 continue; 470 if (ip->i_dquot[i] == NODQUOT) { 471 UFS_UNLOCK(ump); 472 vprint("chkdquot: missing dquot", ITOV(ip)); 473 panic("chkdquot: missing dquot"); 474 } 475 } 476 UFS_UNLOCK(ump); 477} 478#endif 479 480/* 481 * Code to process quotactl commands. 482 */ 483 484/* 485 * Q_QUOTAON - set up a quota file for a particular filesystem. 486 */ 487int 488quotaon(struct thread *td, struct mount *mp, int type, void *fname) 489{ 490 struct ufsmount *ump; 491 struct vnode *vp, **vpp; 492 struct vnode *mvp; 493 struct dquot *dq; 494 int error, flags; 495 struct nameidata nd; 496 497 error = priv_check(td, PRIV_UFS_QUOTAON); 498 if (error != 0) { 499 vfs_unbusy(mp); 500 return (error); 501 } 502 503 if ((mp->mnt_flag & MNT_RDONLY) != 0) { 504 vfs_unbusy(mp); 505 return (EROFS); 506 } 507 508 ump = VFSTOUFS(mp); 509 dq = NODQUOT; 510 511 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, fname, td); 512 flags = FREAD | FWRITE; 513 vfs_ref(mp); 514 vfs_unbusy(mp); 515 error = vn_open(&nd, &flags, 0, NULL); 516 if (error != 0) { 517 vfs_rel(mp); 518 return (error); 519 } 520 NDFREE(&nd, NDF_ONLY_PNBUF); 521 vp = nd.ni_vp; 522 error = vfs_busy(mp, MBF_NOWAIT); 523 vfs_rel(mp); 524 if (error == 0) { 525 if (vp->v_type != VREG) { 526 error = EACCES; 527 vfs_unbusy(mp); 528 } 529 } 530 if (error != 0) { 531 VOP_UNLOCK(vp, 0); 532 (void) vn_close(vp, FREAD|FWRITE, td->td_ucred, td); 533 return (error); 534 } 535 536 UFS_LOCK(ump); 537 if ((ump->um_qflags[type] & (QTF_OPENING|QTF_CLOSING)) != 0) { 538 UFS_UNLOCK(ump); 539 VOP_UNLOCK(vp, 0); 540 (void) vn_close(vp, FREAD|FWRITE, td->td_ucred, td); 541 vfs_unbusy(mp); 542 return (EALREADY); 543 } 544 ump->um_qflags[type] |= QTF_OPENING|QTF_CLOSING; 545 UFS_UNLOCK(ump); 546 if ((error = dqopen(vp, ump, type)) != 0) { 547 VOP_UNLOCK(vp, 0); 548 UFS_LOCK(ump); 549 ump->um_qflags[type] &= ~(QTF_OPENING|QTF_CLOSING); 550 UFS_UNLOCK(ump); 551 (void) vn_close(vp, FREAD|FWRITE, td->td_ucred, td); 552 vfs_unbusy(mp); 553 return (error); 554 } 555 VOP_UNLOCK(vp, 0); 556 MNT_ILOCK(mp); 557 mp->mnt_flag |= MNT_QUOTA; 558 MNT_IUNLOCK(mp); 559 560 vpp = &ump->um_quotas[type]; 561 if (*vpp != vp) 562 quotaoff1(td, mp, type); 563 564 /* 565 * When the directory vnode containing the quota file is 566 * inactivated, due to the shared lookup of the quota file 567 * vput()ing the dvp, the qsyncvp() call for the containing 568 * directory would try to acquire the quota lock exclusive. 569 * At the same time, lookup already locked the quota vnode 570 * shared. Mark the quota vnode lock as allowing recursion 571 * and automatically converting shared locks to exclusive. 572 * 573 * Also mark quota vnode as system. 574 */ 575 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 576 vp->v_vflag |= VV_SYSTEM; 577 VN_LOCK_AREC(vp); 578 VN_LOCK_DSHARE(vp); 579 VOP_UNLOCK(vp, 0); 580 *vpp = vp; 581 /* 582 * Save the credential of the process that turned on quotas. 583 * Set up the time limits for this quota. 584 */ 585 ump->um_cred[type] = crhold(td->td_ucred); 586 ump->um_btime[type] = MAX_DQ_TIME; 587 ump->um_itime[type] = MAX_IQ_TIME; 588 if (dqget(NULLVP, 0, ump, type, &dq) == 0) { 589 if (dq->dq_btime > 0) 590 ump->um_btime[type] = dq->dq_btime; 591 if (dq->dq_itime > 0) 592 ump->um_itime[type] = dq->dq_itime; 593 dqrele(NULLVP, dq); 594 } 595 /* 596 * Allow the getdq from getinoquota below to read the quota 597 * from file. 598 */ 599 UFS_LOCK(ump); 600 ump->um_qflags[type] &= ~QTF_CLOSING; 601 UFS_UNLOCK(ump); 602 /* 603 * Search vnodes associated with this mount point, 604 * adding references to quota file being opened. 605 * NB: only need to add dquot's for inodes being modified. 606 */ 607again: 608 MNT_VNODE_FOREACH_ALL(vp, mp, mvp) { 609 if (vget(vp, LK_EXCLUSIVE | LK_INTERLOCK, td)) { 610 MNT_VNODE_FOREACH_ALL_ABORT(mp, mvp); 611 goto again; 612 } 613 if (vp->v_type == VNON || vp->v_writecount == 0) { 614 VOP_UNLOCK(vp, 0); 615 vrele(vp); 616 continue; 617 } 618 error = getinoquota(VTOI(vp)); 619 VOP_UNLOCK(vp, 0); 620 vrele(vp); 621 if (error) { 622 MNT_VNODE_FOREACH_ALL_ABORT(mp, mvp); 623 break; 624 } 625 } 626 627 if (error) 628 quotaoff_inchange(td, mp, type); 629 UFS_LOCK(ump); 630 ump->um_qflags[type] &= ~QTF_OPENING; 631 KASSERT((ump->um_qflags[type] & QTF_CLOSING) == 0, 632 ("quotaon: leaking flags")); 633 UFS_UNLOCK(ump); 634 635 vfs_unbusy(mp); 636 return (error); 637} 638 639/* 640 * Main code to turn off disk quotas for a filesystem. Does not change 641 * flags. 642 */ 643static int 644quotaoff1(struct thread *td, struct mount *mp, int type) 645{ 646 struct vnode *vp; 647 struct vnode *qvp, *mvp; 648 struct ufsmount *ump; 649 struct dquot *dq; 650 struct inode *ip; 651 struct ucred *cr; 652 int error; 653 654 ump = VFSTOUFS(mp); 655 656 UFS_LOCK(ump); 657 KASSERT((ump->um_qflags[type] & QTF_CLOSING) != 0, 658 ("quotaoff1: flags are invalid")); 659 if ((qvp = ump->um_quotas[type]) == NULLVP) { 660 UFS_UNLOCK(ump); 661 return (0); 662 } 663 cr = ump->um_cred[type]; 664 UFS_UNLOCK(ump); 665 666 /* 667 * Search vnodes associated with this mount point, 668 * deleting any references to quota file being closed. 669 */ 670again: 671 MNT_VNODE_FOREACH_ALL(vp, mp, mvp) { 672 if (vp->v_type == VNON) { 673 VI_UNLOCK(vp); 674 continue; 675 } 676 if (vget(vp, LK_EXCLUSIVE | LK_INTERLOCK, td)) { 677 MNT_VNODE_FOREACH_ALL_ABORT(mp, mvp); 678 goto again; 679 } 680 ip = VTOI(vp); 681 dq = ip->i_dquot[type]; 682 ip->i_dquot[type] = NODQUOT; 683 dqrele(vp, dq); 684 VOP_UNLOCK(vp, 0); 685 vrele(vp); 686 } 687 688 error = dqflush(qvp); 689 if (error != 0) 690 return (error); 691 692 /* 693 * Clear um_quotas before closing the quota vnode to prevent 694 * access to the closed vnode from dqget/dqsync 695 */ 696 UFS_LOCK(ump); 697 ump->um_quotas[type] = NULLVP; 698 ump->um_cred[type] = NOCRED; 699 UFS_UNLOCK(ump); 700 701 vn_lock(qvp, LK_EXCLUSIVE | LK_RETRY); 702 qvp->v_vflag &= ~VV_SYSTEM; 703 VOP_UNLOCK(qvp, 0); 704 error = vn_close(qvp, FREAD|FWRITE, td->td_ucred, td); 705 crfree(cr); 706 707 return (error); 708} 709 710/* 711 * Turns off quotas, assumes that ump->um_qflags are already checked 712 * and QTF_CLOSING is set to indicate operation in progress. Fixes 713 * ump->um_qflags and mp->mnt_flag after. 714 */ 715int 716quotaoff_inchange(struct thread *td, struct mount *mp, int type) 717{ 718 struct ufsmount *ump; 719 int i; 720 int error; 721 722 error = quotaoff1(td, mp, type); 723 724 ump = VFSTOUFS(mp); 725 UFS_LOCK(ump); 726 ump->um_qflags[type] &= ~QTF_CLOSING; 727 for (i = 0; i < MAXQUOTAS; i++) 728 if (ump->um_quotas[i] != NULLVP) 729 break; 730 if (i == MAXQUOTAS) { 731 MNT_ILOCK(mp); 732 mp->mnt_flag &= ~MNT_QUOTA; 733 MNT_IUNLOCK(mp); 734 } 735 UFS_UNLOCK(ump); 736 return (error); 737} 738 739/* 740 * Q_QUOTAOFF - turn off disk quotas for a filesystem. 741 */ 742int 743quotaoff(struct thread *td, struct mount *mp, int type) 744{ 745 struct ufsmount *ump; 746 int error; 747 748 error = priv_check(td, PRIV_UFS_QUOTAOFF); 749 if (error) 750 return (error); 751 752 ump = VFSTOUFS(mp); 753 UFS_LOCK(ump); 754 if ((ump->um_qflags[type] & (QTF_OPENING|QTF_CLOSING)) != 0) { 755 UFS_UNLOCK(ump); 756 return (EALREADY); 757 } 758 ump->um_qflags[type] |= QTF_CLOSING; 759 UFS_UNLOCK(ump); 760 761 return (quotaoff_inchange(td, mp, type)); 762} 763 764/* 765 * Q_GETQUOTA - return current values in a dqblk structure. 766 */ 767static int 768_getquota(struct thread *td, struct mount *mp, u_long id, int type, 769 struct dqblk64 *dqb) 770{ 771 struct dquot *dq; 772 int error; 773 774 switch (type) { 775 case USRQUOTA: 776 if ((td->td_ucred->cr_uid != id) && !unprivileged_get_quota) { 777 error = priv_check(td, PRIV_VFS_GETQUOTA); 778 if (error) 779 return (error); 780 } 781 break; 782 783 case GRPQUOTA: 784 if (!groupmember(id, td->td_ucred) && 785 !unprivileged_get_quota) { 786 error = priv_check(td, PRIV_VFS_GETQUOTA); 787 if (error) 788 return (error); 789 } 790 break; 791 792 default: 793 return (EINVAL); 794 } 795 796 dq = NODQUOT; 797 error = dqget(NULLVP, id, VFSTOUFS(mp), type, &dq); 798 if (error) 799 return (error); 800 *dqb = dq->dq_dqb; 801 dqrele(NULLVP, dq); 802 return (error); 803} 804 805/* 806 * Q_SETQUOTA - assign an entire dqblk structure. 807 */ 808static int 809_setquota(struct thread *td, struct mount *mp, u_long id, int type, 810 struct dqblk64 *dqb) 811{ 812 struct dquot *dq; 813 struct dquot *ndq; 814 struct ufsmount *ump; 815 struct dqblk64 newlim; 816 int error; 817 818 error = priv_check(td, PRIV_VFS_SETQUOTA); 819 if (error) 820 return (error); 821 822 newlim = *dqb; 823 824 ndq = NODQUOT; 825 ump = VFSTOUFS(mp); 826 827 error = dqget(NULLVP, id, ump, type, &ndq); 828 if (error) 829 return (error); 830 dq = ndq; 831 DQI_LOCK(dq); 832 DQI_WAIT(dq, PINOD+1, "setqta"); 833 /* 834 * Copy all but the current values. 835 * Reset time limit if previously had no soft limit or were 836 * under it, but now have a soft limit and are over it. 837 */ 838 newlim.dqb_curblocks = dq->dq_curblocks; 839 newlim.dqb_curinodes = dq->dq_curinodes; 840 if (dq->dq_id != 0) { 841 newlim.dqb_btime = dq->dq_btime; 842 newlim.dqb_itime = dq->dq_itime; 843 } 844 if (newlim.dqb_bsoftlimit && 845 dq->dq_curblocks >= newlim.dqb_bsoftlimit && 846 (dq->dq_bsoftlimit == 0 || dq->dq_curblocks < dq->dq_bsoftlimit)) 847 newlim.dqb_btime = time_second + ump->um_btime[type]; 848 if (newlim.dqb_isoftlimit && 849 dq->dq_curinodes >= newlim.dqb_isoftlimit && 850 (dq->dq_isoftlimit == 0 || dq->dq_curinodes < dq->dq_isoftlimit)) 851 newlim.dqb_itime = time_second + ump->um_itime[type]; 852 dq->dq_dqb = newlim; 853 if (dq->dq_curblocks < dq->dq_bsoftlimit) 854 dq->dq_flags &= ~DQ_BLKS; 855 if (dq->dq_curinodes < dq->dq_isoftlimit) 856 dq->dq_flags &= ~DQ_INODS; 857 if (dq->dq_isoftlimit == 0 && dq->dq_bsoftlimit == 0 && 858 dq->dq_ihardlimit == 0 && dq->dq_bhardlimit == 0) 859 dq->dq_flags |= DQ_FAKE; 860 else 861 dq->dq_flags &= ~DQ_FAKE; 862 dq->dq_flags |= DQ_MOD; 863 DQI_UNLOCK(dq); 864 dqrele(NULLVP, dq); 865 return (0); 866} 867 868/* 869 * Q_SETUSE - set current inode and block usage. 870 */ 871static int 872_setuse(struct thread *td, struct mount *mp, u_long id, int type, 873 struct dqblk64 *dqb) 874{ 875 struct dquot *dq; 876 struct ufsmount *ump; 877 struct dquot *ndq; 878 struct dqblk64 usage; 879 int error; 880 881 error = priv_check(td, PRIV_UFS_SETUSE); 882 if (error) 883 return (error); 884 885 usage = *dqb; 886 887 ump = VFSTOUFS(mp); 888 ndq = NODQUOT; 889 890 error = dqget(NULLVP, id, ump, type, &ndq); 891 if (error) 892 return (error); 893 dq = ndq; 894 DQI_LOCK(dq); 895 DQI_WAIT(dq, PINOD+1, "setuse"); 896 /* 897 * Reset time limit if have a soft limit and were 898 * previously under it, but are now over it. 899 */ 900 if (dq->dq_bsoftlimit && dq->dq_curblocks < dq->dq_bsoftlimit && 901 usage.dqb_curblocks >= dq->dq_bsoftlimit) 902 dq->dq_btime = time_second + ump->um_btime[type]; 903 if (dq->dq_isoftlimit && dq->dq_curinodes < dq->dq_isoftlimit && 904 usage.dqb_curinodes >= dq->dq_isoftlimit) 905 dq->dq_itime = time_second + ump->um_itime[type]; 906 dq->dq_curblocks = usage.dqb_curblocks; 907 dq->dq_curinodes = usage.dqb_curinodes; 908 if (dq->dq_curblocks < dq->dq_bsoftlimit) 909 dq->dq_flags &= ~DQ_BLKS; 910 if (dq->dq_curinodes < dq->dq_isoftlimit) 911 dq->dq_flags &= ~DQ_INODS; 912 dq->dq_flags |= DQ_MOD; 913 DQI_UNLOCK(dq); 914 dqrele(NULLVP, dq); 915 return (0); 916} 917 918int 919getquota32(struct thread *td, struct mount *mp, u_long id, int type, void *addr) 920{ 921 struct dqblk32 dqb32; 922 struct dqblk64 dqb64; 923 int error; 924 925 error = _getquota(td, mp, id, type, &dqb64); 926 if (error) 927 return (error); 928 dqb64_dqb32(&dqb64, &dqb32); 929 error = copyout(&dqb32, addr, sizeof(dqb32)); 930 return (error); 931} 932 933int 934setquota32(struct thread *td, struct mount *mp, u_long id, int type, void *addr) 935{ 936 struct dqblk32 dqb32; 937 struct dqblk64 dqb64; 938 int error; 939 940 error = copyin(addr, &dqb32, sizeof(dqb32)); 941 if (error) 942 return (error); 943 dqb32_dqb64(&dqb32, &dqb64); 944 error = _setquota(td, mp, id, type, &dqb64); 945 return (error); 946} 947 948int 949setuse32(struct thread *td, struct mount *mp, u_long id, int type, void *addr) 950{ 951 struct dqblk32 dqb32; 952 struct dqblk64 dqb64; 953 int error; 954 955 error = copyin(addr, &dqb32, sizeof(dqb32)); 956 if (error) 957 return (error); 958 dqb32_dqb64(&dqb32, &dqb64); 959 error = _setuse(td, mp, id, type, &dqb64); 960 return (error); 961} 962 963int 964getquota(struct thread *td, struct mount *mp, u_long id, int type, void *addr) 965{ 966 struct dqblk64 dqb64; 967 int error; 968 969 error = _getquota(td, mp, id, type, &dqb64); 970 if (error) 971 return (error); 972 error = copyout(&dqb64, addr, sizeof(dqb64)); 973 return (error); 974} 975 976int 977setquota(struct thread *td, struct mount *mp, u_long id, int type, void *addr) 978{ 979 struct dqblk64 dqb64; 980 int error; 981 982 error = copyin(addr, &dqb64, sizeof(dqb64)); 983 if (error) 984 return (error); 985 error = _setquota(td, mp, id, type, &dqb64); 986 return (error); 987} 988 989int 990setuse(struct thread *td, struct mount *mp, u_long id, int type, void *addr) 991{ 992 struct dqblk64 dqb64; 993 int error; 994 995 error = copyin(addr, &dqb64, sizeof(dqb64)); 996 if (error) 997 return (error); 998 error = _setuse(td, mp, id, type, &dqb64); 999 return (error); 1000} 1001 1002/* 1003 * Q_GETQUOTASIZE - get bit-size of quota file fields 1004 */ 1005int 1006getquotasize(struct thread *td, struct mount *mp, u_long id, int type, 1007 void *sizep) 1008{ 1009 struct ufsmount *ump = VFSTOUFS(mp); 1010 int bitsize; 1011 1012 UFS_LOCK(ump); 1013 if (ump->um_quotas[type] == NULLVP || 1014 (ump->um_qflags[type] & QTF_CLOSING)) { 1015 UFS_UNLOCK(ump); 1016 return (EINVAL); 1017 } 1018 if ((ump->um_qflags[type] & QTF_64BIT) != 0) 1019 bitsize = 64; 1020 else 1021 bitsize = 32; 1022 UFS_UNLOCK(ump); 1023 return (copyout(&bitsize, sizep, sizeof(int))); 1024} 1025 1026/* 1027 * Q_SYNC - sync quota files to disk. 1028 */ 1029int 1030qsync(struct mount *mp) 1031{ 1032 struct ufsmount *ump = VFSTOUFS(mp); 1033 struct thread *td = curthread; /* XXX */ 1034 struct vnode *vp, *mvp; 1035 struct dquot *dq; 1036 int i, error; 1037 1038 /* 1039 * Check if the mount point has any quotas. 1040 * If not, simply return. 1041 */ 1042 UFS_LOCK(ump); 1043 for (i = 0; i < MAXQUOTAS; i++) 1044 if (ump->um_quotas[i] != NULLVP) 1045 break; 1046 UFS_UNLOCK(ump); 1047 if (i == MAXQUOTAS) 1048 return (0); 1049 /* 1050 * Search vnodes associated with this mount point, 1051 * synchronizing any modified dquot structures. 1052 */ 1053again: 1054 MNT_VNODE_FOREACH_ACTIVE(vp, mp, mvp) { 1055 if (vp->v_type == VNON) { 1056 VI_UNLOCK(vp); 1057 continue; 1058 } 1059 error = vget(vp, LK_EXCLUSIVE | LK_INTERLOCK, td); 1060 if (error) { 1061 if (error == ENOENT) { 1062 MNT_VNODE_FOREACH_ACTIVE_ABORT(mp, mvp); 1063 goto again; 1064 } 1065 continue; 1066 } 1067 for (i = 0; i < MAXQUOTAS; i++) { 1068 dq = VTOI(vp)->i_dquot[i]; 1069 if (dq != NODQUOT) 1070 dqsync(vp, dq); 1071 } 1072 vput(vp); 1073 } 1074 return (0); 1075} 1076 1077/* 1078 * Sync quota file for given vnode to disk. 1079 */ 1080int 1081qsyncvp(struct vnode *vp) 1082{ 1083 struct ufsmount *ump = VFSTOUFS(vp->v_mount); 1084 struct dquot *dq; 1085 int i; 1086 1087 /* 1088 * Check if the mount point has any quotas. 1089 * If not, simply return. 1090 */ 1091 UFS_LOCK(ump); 1092 for (i = 0; i < MAXQUOTAS; i++) 1093 if (ump->um_quotas[i] != NULLVP) 1094 break; 1095 UFS_UNLOCK(ump); 1096 if (i == MAXQUOTAS) 1097 return (0); 1098 /* 1099 * Search quotas associated with this vnode 1100 * synchronizing any modified dquot structures. 1101 */ 1102 for (i = 0; i < MAXQUOTAS; i++) { 1103 dq = VTOI(vp)->i_dquot[i]; 1104 if (dq != NODQUOT) 1105 dqsync(vp, dq); 1106 } 1107 return (0); 1108} 1109 1110/* 1111 * Code pertaining to management of the in-core dquot data structures. 1112 */ 1113#define DQHASH(dqvp, id) \ 1114 (&dqhashtbl[((((intptr_t)(dqvp)) >> 8) + id) & dqhash]) 1115static LIST_HEAD(dqhash, dquot) *dqhashtbl; 1116static u_long dqhash; 1117 1118/* 1119 * Dquot free list. 1120 */ 1121#define DQUOTINC 5 /* minimum free dquots desired */ 1122static TAILQ_HEAD(dqfreelist, dquot) dqfreelist; 1123static long numdquot, desireddquot = DQUOTINC; 1124 1125/* 1126 * Lock to protect quota hash, dq free list and dq_cnt ref counters of 1127 * _all_ dqs. 1128 */ 1129struct mtx dqhlock; 1130 1131#define DQH_LOCK() mtx_lock(&dqhlock) 1132#define DQH_UNLOCK() mtx_unlock(&dqhlock) 1133 1134static struct dquot *dqhashfind(struct dqhash *dqh, u_long id, 1135 struct vnode *dqvp); 1136 1137/* 1138 * Initialize the quota system. 1139 */ 1140void 1141dqinit(void) 1142{ 1143 1144 mtx_init(&dqhlock, "dqhlock", NULL, MTX_DEF); 1145 dqhashtbl = hashinit(desiredvnodes, M_DQUOT, &dqhash); 1146 TAILQ_INIT(&dqfreelist); 1147} 1148 1149/* 1150 * Shut down the quota system. 1151 */ 1152void 1153dquninit(void) 1154{ 1155 struct dquot *dq; 1156 1157 hashdestroy(dqhashtbl, M_DQUOT, dqhash); 1158 while ((dq = TAILQ_FIRST(&dqfreelist)) != NULL) { 1159 TAILQ_REMOVE(&dqfreelist, dq, dq_freelist); 1160 mtx_destroy(&dq->dq_lock); 1161 free(dq, M_DQUOT); 1162 } 1163 mtx_destroy(&dqhlock); 1164} 1165 1166static struct dquot * 1167dqhashfind(struct dqhash *dqh, u_long id, struct vnode *dqvp) 1168{ 1169 struct dquot *dq; 1170 1171 mtx_assert(&dqhlock, MA_OWNED); 1172 LIST_FOREACH(dq, dqh, dq_hash) { 1173 if (dq->dq_id != id || 1174 dq->dq_ump->um_quotas[dq->dq_type] != dqvp) 1175 continue; 1176 /* 1177 * Cache hit with no references. Take 1178 * the structure off the free list. 1179 */ 1180 if (dq->dq_cnt == 0) 1181 TAILQ_REMOVE(&dqfreelist, dq, dq_freelist); 1182 DQREF(dq); 1183 return (dq); 1184 } 1185 return (NODQUOT); 1186} 1187 1188/* 1189 * Determine the quota file type. 1190 * 1191 * A 32-bit quota file is simply an array of struct dqblk32. 1192 * 1193 * A 64-bit quota file is a struct dqhdr64 followed by an array of struct 1194 * dqblk64. The header contains various magic bits which allow us to be 1195 * reasonably confident that it is indeeda 64-bit quota file and not just 1196 * a 32-bit quota file that just happens to "look right". 1197 * 1198 */ 1199static int 1200dqopen(struct vnode *vp, struct ufsmount *ump, int type) 1201{ 1202 struct dqhdr64 dqh; 1203 struct iovec aiov; 1204 struct uio auio; 1205 int error; 1206 1207 ASSERT_VOP_LOCKED(vp, "dqopen"); 1208 auio.uio_iov = &aiov; 1209 auio.uio_iovcnt = 1; 1210 aiov.iov_base = &dqh; 1211 aiov.iov_len = sizeof(dqh); 1212 auio.uio_resid = sizeof(dqh); 1213 auio.uio_offset = 0; 1214 auio.uio_segflg = UIO_SYSSPACE; 1215 auio.uio_rw = UIO_READ; 1216 auio.uio_td = (struct thread *)0; 1217 error = VOP_READ(vp, &auio, 0, ump->um_cred[type]); 1218 1219 if (error != 0) 1220 return (error); 1221 if (auio.uio_resid > 0) { 1222 /* assume 32 bits */ 1223 return (0); 1224 } 1225 1226 UFS_LOCK(ump); 1227 if (strcmp(dqh.dqh_magic, Q_DQHDR64_MAGIC) == 0 && 1228 be32toh(dqh.dqh_version) == Q_DQHDR64_VERSION && 1229 be32toh(dqh.dqh_hdrlen) == (uint32_t)sizeof(struct dqhdr64) && 1230 be32toh(dqh.dqh_reclen) == (uint32_t)sizeof(struct dqblk64)) { 1231 /* XXX: what if the magic matches, but the sizes are wrong? */ 1232 ump->um_qflags[type] |= QTF_64BIT; 1233 } else { 1234 ump->um_qflags[type] &= ~QTF_64BIT; 1235 } 1236 UFS_UNLOCK(ump); 1237 1238 return (0); 1239} 1240 1241/* 1242 * Obtain a dquot structure for the specified identifier and quota file 1243 * reading the information from the file if necessary. 1244 */ 1245static int 1246dqget(struct vnode *vp, u_long id, struct ufsmount *ump, int type, 1247 struct dquot **dqp) 1248{ 1249 uint8_t buf[sizeof(struct dqblk64)]; 1250 off_t base, recsize; 1251 struct dquot *dq, *dq1; 1252 struct dqhash *dqh; 1253 struct vnode *dqvp; 1254 struct iovec aiov; 1255 struct uio auio; 1256 int dqvplocked, error; 1257 1258#ifdef DEBUG_VFS_LOCKS 1259 if (vp != NULLVP) 1260 ASSERT_VOP_ELOCKED(vp, "dqget"); 1261#endif 1262 1263 if (vp != NULLVP && *dqp != NODQUOT) { 1264 return (0); 1265 } 1266 1267 /* XXX: Disallow negative id values to prevent the 1268 * creation of 100GB+ quota data files. 1269 */ 1270 if ((int)id < 0) 1271 return (EINVAL); 1272 1273 UFS_LOCK(ump); 1274 dqvp = ump->um_quotas[type]; 1275 if (dqvp == NULLVP || (ump->um_qflags[type] & QTF_CLOSING)) { 1276 *dqp = NODQUOT; 1277 UFS_UNLOCK(ump); 1278 return (EINVAL); 1279 } 1280 vref(dqvp); 1281 UFS_UNLOCK(ump); 1282 error = 0; 1283 dqvplocked = 0; 1284 1285 /* 1286 * Check the cache first. 1287 */ 1288 dqh = DQHASH(dqvp, id); 1289 DQH_LOCK(); 1290 dq = dqhashfind(dqh, id, dqvp); 1291 if (dq != NULL) { 1292 DQH_UNLOCK(); 1293hfound: DQI_LOCK(dq); 1294 DQI_WAIT(dq, PINOD+1, "dqget"); 1295 DQI_UNLOCK(dq); 1296 if (dq->dq_ump == NULL) { 1297 dqrele(vp, dq); 1298 dq = NODQUOT; 1299 error = EIO; 1300 } 1301 *dqp = dq; 1302 if (dqvplocked) 1303 vput(dqvp); 1304 else 1305 vrele(dqvp); 1306 return (error); 1307 } 1308 1309 /* 1310 * Quota vnode lock is before DQ_LOCK. Acquire dqvp lock there 1311 * since new dq will appear on the hash chain DQ_LOCKed. 1312 */ 1313 if (vp != dqvp) { 1314 DQH_UNLOCK(); 1315 vn_lock(dqvp, LK_SHARED | LK_RETRY); 1316 dqvplocked = 1; 1317 DQH_LOCK(); 1318 /* 1319 * Recheck the cache after sleep for quota vnode lock. 1320 */ 1321 dq = dqhashfind(dqh, id, dqvp); 1322 if (dq != NULL) { 1323 DQH_UNLOCK(); 1324 goto hfound; 1325 } 1326 } 1327 1328 /* 1329 * Not in cache, allocate a new one or take it from the 1330 * free list. 1331 */ 1332 if (TAILQ_FIRST(&dqfreelist) == NODQUOT && 1333 numdquot < MAXQUOTAS * desiredvnodes) 1334 desireddquot += DQUOTINC; 1335 if (numdquot < desireddquot) { 1336 numdquot++; 1337 DQH_UNLOCK(); 1338 dq1 = malloc(sizeof *dq1, M_DQUOT, M_WAITOK | M_ZERO); 1339 mtx_init(&dq1->dq_lock, "dqlock", NULL, MTX_DEF); 1340 DQH_LOCK(); 1341 /* 1342 * Recheck the cache after sleep for memory. 1343 */ 1344 dq = dqhashfind(dqh, id, dqvp); 1345 if (dq != NULL) { 1346 numdquot--; 1347 DQH_UNLOCK(); 1348 mtx_destroy(&dq1->dq_lock); 1349 free(dq1, M_DQUOT); 1350 goto hfound; 1351 } 1352 dq = dq1; 1353 } else { 1354 if ((dq = TAILQ_FIRST(&dqfreelist)) == NULL) { 1355 DQH_UNLOCK(); 1356 tablefull("dquot"); 1357 *dqp = NODQUOT; 1358 if (dqvplocked) 1359 vput(dqvp); 1360 else 1361 vrele(dqvp); 1362 return (EUSERS); 1363 } 1364 if (dq->dq_cnt || (dq->dq_flags & DQ_MOD)) 1365 panic("dqget: free dquot isn't %p", dq); 1366 TAILQ_REMOVE(&dqfreelist, dq, dq_freelist); 1367 if (dq->dq_ump != NULL) 1368 LIST_REMOVE(dq, dq_hash); 1369 } 1370 1371 /* 1372 * Dq is put into hash already locked to prevent parallel 1373 * usage while it is being read from file. 1374 */ 1375 dq->dq_flags = DQ_LOCK; 1376 dq->dq_id = id; 1377 dq->dq_type = type; 1378 dq->dq_ump = ump; 1379 LIST_INSERT_HEAD(dqh, dq, dq_hash); 1380 DQREF(dq); 1381 DQH_UNLOCK(); 1382 1383 /* 1384 * Read the requested quota record from the quota file, performing 1385 * any necessary conversions. 1386 */ 1387 if (ump->um_qflags[type] & QTF_64BIT) { 1388 recsize = sizeof(struct dqblk64); 1389 base = sizeof(struct dqhdr64); 1390 } else { 1391 recsize = sizeof(struct dqblk32); 1392 base = 0; 1393 } 1394 auio.uio_iov = &aiov; 1395 auio.uio_iovcnt = 1; 1396 aiov.iov_base = buf; 1397 aiov.iov_len = recsize; 1398 auio.uio_resid = recsize; 1399 auio.uio_offset = base + id * recsize; 1400 auio.uio_segflg = UIO_SYSSPACE; 1401 auio.uio_rw = UIO_READ; 1402 auio.uio_td = (struct thread *)0; 1403 1404 error = VOP_READ(dqvp, &auio, 0, ump->um_cred[type]); 1405 if (auio.uio_resid == recsize && error == 0) { 1406 bzero(&dq->dq_dqb, sizeof(dq->dq_dqb)); 1407 } else { 1408 if (ump->um_qflags[type] & QTF_64BIT) 1409 dqb64_dq((struct dqblk64 *)buf, dq); 1410 else 1411 dqb32_dq((struct dqblk32 *)buf, dq); 1412 } 1413 if (dqvplocked) 1414 vput(dqvp); 1415 else 1416 vrele(dqvp); 1417 /* 1418 * I/O error in reading quota file, release 1419 * quota structure and reflect problem to caller. 1420 */ 1421 if (error) { 1422 DQH_LOCK(); 1423 dq->dq_ump = NULL; 1424 LIST_REMOVE(dq, dq_hash); 1425 DQH_UNLOCK(); 1426 DQI_LOCK(dq); 1427 if (dq->dq_flags & DQ_WANT) 1428 wakeup(dq); 1429 dq->dq_flags = 0; 1430 DQI_UNLOCK(dq); 1431 dqrele(vp, dq); 1432 *dqp = NODQUOT; 1433 return (error); 1434 } 1435 DQI_LOCK(dq); 1436 /* 1437 * Check for no limit to enforce. 1438 * Initialize time values if necessary. 1439 */ 1440 if (dq->dq_isoftlimit == 0 && dq->dq_bsoftlimit == 0 && 1441 dq->dq_ihardlimit == 0 && dq->dq_bhardlimit == 0) 1442 dq->dq_flags |= DQ_FAKE; 1443 if (dq->dq_id != 0) { 1444 if (dq->dq_btime == 0) { 1445 dq->dq_btime = time_second + ump->um_btime[type]; 1446 if (dq->dq_bsoftlimit && 1447 dq->dq_curblocks >= dq->dq_bsoftlimit) 1448 dq->dq_flags |= DQ_MOD; 1449 } 1450 if (dq->dq_itime == 0) { 1451 dq->dq_itime = time_second + ump->um_itime[type]; 1452 if (dq->dq_isoftlimit && 1453 dq->dq_curinodes >= dq->dq_isoftlimit) 1454 dq->dq_flags |= DQ_MOD; 1455 } 1456 } 1457 DQI_WAKEUP(dq); 1458 DQI_UNLOCK(dq); 1459 *dqp = dq; 1460 return (0); 1461} 1462 1463#ifdef DIAGNOSTIC 1464/* 1465 * Obtain a reference to a dquot. 1466 */ 1467static void 1468dqref(struct dquot *dq) 1469{ 1470 1471 dq->dq_cnt++; 1472} 1473#endif 1474 1475/* 1476 * Release a reference to a dquot. 1477 */ 1478void 1479dqrele(struct vnode *vp, struct dquot *dq) 1480{ 1481 1482 if (dq == NODQUOT) 1483 return; 1484 DQH_LOCK(); 1485 KASSERT(dq->dq_cnt > 0, ("Lost dq %p reference 1", dq)); 1486 if (dq->dq_cnt > 1) { 1487 dq->dq_cnt--; 1488 DQH_UNLOCK(); 1489 return; 1490 } 1491 DQH_UNLOCK(); 1492sync: 1493 (void) dqsync(vp, dq); 1494 1495 DQH_LOCK(); 1496 KASSERT(dq->dq_cnt > 0, ("Lost dq %p reference 2", dq)); 1497 if (--dq->dq_cnt > 0) 1498 { 1499 DQH_UNLOCK(); 1500 return; 1501 } 1502 1503 /* 1504 * The dq may become dirty after it is synced but before it is 1505 * put to the free list. Checking the DQ_MOD there without 1506 * locking dq should be safe since no other references to the 1507 * dq exist. 1508 */ 1509 if ((dq->dq_flags & DQ_MOD) != 0) { 1510 dq->dq_cnt++; 1511 DQH_UNLOCK(); 1512 goto sync; 1513 } 1514 TAILQ_INSERT_TAIL(&dqfreelist, dq, dq_freelist); 1515 DQH_UNLOCK(); 1516} 1517 1518/* 1519 * Update the disk quota in the quota file. 1520 */ 1521static int 1522dqsync(struct vnode *vp, struct dquot *dq) 1523{ 1524 uint8_t buf[sizeof(struct dqblk64)]; 1525 off_t base, recsize; 1526 struct vnode *dqvp; 1527 struct iovec aiov; 1528 struct uio auio; 1529 int error; 1530 struct mount *mp; 1531 struct ufsmount *ump; 1532 1533#ifdef DEBUG_VFS_LOCKS 1534 if (vp != NULL) 1535 ASSERT_VOP_ELOCKED(vp, "dqsync"); 1536#endif 1537 1538 mp = NULL; 1539 error = 0; 1540 if (dq == NODQUOT) 1541 panic("dqsync: dquot"); 1542 if ((ump = dq->dq_ump) == NULL) 1543 return (0); 1544 UFS_LOCK(ump); 1545 if ((dqvp = ump->um_quotas[dq->dq_type]) == NULLVP) { 1546 if (vp == NULL) { 1547 UFS_UNLOCK(ump); 1548 return (0); 1549 } else 1550 panic("dqsync: file"); 1551 } 1552 vref(dqvp); 1553 UFS_UNLOCK(ump); 1554 1555 DQI_LOCK(dq); 1556 if ((dq->dq_flags & DQ_MOD) == 0) { 1557 DQI_UNLOCK(dq); 1558 vrele(dqvp); 1559 return (0); 1560 } 1561 DQI_UNLOCK(dq); 1562 1563 (void) vn_start_secondary_write(dqvp, &mp, V_WAIT); 1564 if (vp != dqvp) 1565 vn_lock(dqvp, LK_EXCLUSIVE | LK_RETRY); 1566 1567 DQI_LOCK(dq); 1568 DQI_WAIT(dq, PINOD+2, "dqsync"); 1569 if ((dq->dq_flags & DQ_MOD) == 0) 1570 goto out; 1571 dq->dq_flags |= DQ_LOCK; 1572 DQI_UNLOCK(dq); 1573 1574 /* 1575 * Write the quota record to the quota file, performing any 1576 * necessary conversions. See dqget() for additional details. 1577 */ 1578 if (ump->um_qflags[dq->dq_type] & QTF_64BIT) { 1579 dq_dqb64(dq, (struct dqblk64 *)buf); 1580 recsize = sizeof(struct dqblk64); 1581 base = sizeof(struct dqhdr64); 1582 } else { 1583 dq_dqb32(dq, (struct dqblk32 *)buf); 1584 recsize = sizeof(struct dqblk32); 1585 base = 0; 1586 } 1587 1588 auio.uio_iov = &aiov; 1589 auio.uio_iovcnt = 1; 1590 aiov.iov_base = buf; 1591 aiov.iov_len = recsize; 1592 auio.uio_resid = recsize; 1593 auio.uio_offset = base + dq->dq_id * recsize; 1594 auio.uio_segflg = UIO_SYSSPACE; 1595 auio.uio_rw = UIO_WRITE; 1596 auio.uio_td = (struct thread *)0; 1597 error = VOP_WRITE(dqvp, &auio, 0, dq->dq_ump->um_cred[dq->dq_type]); 1598 if (auio.uio_resid && error == 0) 1599 error = EIO; 1600 1601 DQI_LOCK(dq); 1602 DQI_WAKEUP(dq); 1603 dq->dq_flags &= ~DQ_MOD; 1604out: 1605 DQI_UNLOCK(dq); 1606 if (vp != dqvp) 1607 vput(dqvp); 1608 else 1609 vrele(dqvp); 1610 vn_finished_secondary_write(mp); 1611 return (error); 1612} 1613 1614/* 1615 * Flush all entries from the cache for a particular vnode. 1616 */ 1617static int 1618dqflush(struct vnode *vp) 1619{ 1620 struct dquot *dq, *nextdq; 1621 struct dqhash *dqh; 1622 int error; 1623 1624 /* 1625 * Move all dquot's that used to refer to this quota 1626 * file off their hash chains (they will eventually 1627 * fall off the head of the free list and be re-used). 1628 */ 1629 error = 0; 1630 DQH_LOCK(); 1631 for (dqh = &dqhashtbl[dqhash]; dqh >= dqhashtbl; dqh--) { 1632 for (dq = LIST_FIRST(dqh); dq; dq = nextdq) { 1633 nextdq = LIST_NEXT(dq, dq_hash); 1634 if (dq->dq_ump->um_quotas[dq->dq_type] != vp) 1635 continue; 1636 if (dq->dq_cnt) 1637 error = EBUSY; 1638 else { 1639 LIST_REMOVE(dq, dq_hash); 1640 dq->dq_ump = NULL; 1641 } 1642 } 1643 } 1644 DQH_UNLOCK(); 1645 return (error); 1646} 1647 1648/* 1649 * The following three functions are provided for the adjustment of 1650 * quotas by the soft updates code. 1651 */ 1652#ifdef SOFTUPDATES 1653/* 1654 * Acquire a reference to the quota structures associated with a vnode. 1655 * Return count of number of quota structures found. 1656 */ 1657int 1658quotaref(vp, qrp) 1659 struct vnode *vp; 1660 struct dquot **qrp; 1661{ 1662 struct inode *ip; 1663 struct dquot *dq; 1664 int i, found; 1665 1666 for (i = 0; i < MAXQUOTAS; i++) 1667 qrp[i] = NODQUOT; 1668 /* 1669 * Disk quotas must be turned off for system files. Currently 1670 * snapshot and quota files. 1671 */ 1672 if ((vp->v_vflag & VV_SYSTEM) != 0) 1673 return (0); 1674 /* 1675 * Iterate through and copy active quotas. 1676 */ 1677 found = 0; 1678 ip = VTOI(vp); 1679 mtx_lock(&dqhlock); 1680 for (i = 0; i < MAXQUOTAS; i++) { 1681 if ((dq = ip->i_dquot[i]) == NODQUOT) 1682 continue; 1683 DQREF(dq); 1684 qrp[i] = dq; 1685 found++; 1686 } 1687 mtx_unlock(&dqhlock); 1688 return (found); 1689} 1690 1691/* 1692 * Release a set of quota structures obtained from a vnode. 1693 */ 1694void 1695quotarele(qrp) 1696 struct dquot **qrp; 1697{ 1698 struct dquot *dq; 1699 int i; 1700 1701 for (i = 0; i < MAXQUOTAS; i++) { 1702 if ((dq = qrp[i]) == NODQUOT) 1703 continue; 1704 dqrele(NULL, dq); 1705 } 1706} 1707 1708/* 1709 * Adjust the number of blocks associated with a quota. 1710 * Positive numbers when adding blocks; negative numbers when freeing blocks. 1711 */ 1712void 1713quotaadj(qrp, ump, blkcount) 1714 struct dquot **qrp; 1715 struct ufsmount *ump; 1716 int64_t blkcount; 1717{ 1718 struct dquot *dq; 1719 ufs2_daddr_t ncurblocks; 1720 int i; 1721 1722 if (blkcount == 0) 1723 return; 1724 for (i = 0; i < MAXQUOTAS; i++) { 1725 if ((dq = qrp[i]) == NODQUOT) 1726 continue; 1727 DQI_LOCK(dq); 1728 DQI_WAIT(dq, PINOD+1, "adjqta"); 1729 ncurblocks = dq->dq_curblocks + blkcount; 1730 if (ncurblocks >= 0) 1731 dq->dq_curblocks = ncurblocks; 1732 else 1733 dq->dq_curblocks = 0; 1734 if (blkcount < 0) 1735 dq->dq_flags &= ~DQ_BLKS; 1736 else if (dq->dq_curblocks + blkcount >= dq->dq_bsoftlimit && 1737 dq->dq_curblocks < dq->dq_bsoftlimit) 1738 dq->dq_btime = time_second + ump->um_btime[i]; 1739 dq->dq_flags |= DQ_MOD; 1740 DQI_UNLOCK(dq); 1741 } 1742} 1743#endif /* SOFTUPDATES */ 1744 1745/* 1746 * 32-bit / 64-bit conversion functions. 1747 * 1748 * 32-bit quota records are stored in native byte order. Attention must 1749 * be paid to overflow issues. 1750 * 1751 * 64-bit quota records are stored in network byte order. 1752 */ 1753 1754#define CLIP32(u64) (u64 > UINT32_MAX ? UINT32_MAX : (uint32_t)u64) 1755 1756/* 1757 * Convert 32-bit host-order structure to dquot. 1758 */ 1759static void 1760dqb32_dq(const struct dqblk32 *dqb32, struct dquot *dq) 1761{ 1762 1763 dq->dq_bhardlimit = dqb32->dqb_bhardlimit; 1764 dq->dq_bsoftlimit = dqb32->dqb_bsoftlimit; 1765 dq->dq_curblocks = dqb32->dqb_curblocks; 1766 dq->dq_ihardlimit = dqb32->dqb_ihardlimit; 1767 dq->dq_isoftlimit = dqb32->dqb_isoftlimit; 1768 dq->dq_curinodes = dqb32->dqb_curinodes; 1769 dq->dq_btime = dqb32->dqb_btime; 1770 dq->dq_itime = dqb32->dqb_itime; 1771} 1772 1773/* 1774 * Convert 64-bit network-order structure to dquot. 1775 */ 1776static void 1777dqb64_dq(const struct dqblk64 *dqb64, struct dquot *dq) 1778{ 1779 1780 dq->dq_bhardlimit = be64toh(dqb64->dqb_bhardlimit); 1781 dq->dq_bsoftlimit = be64toh(dqb64->dqb_bsoftlimit); 1782 dq->dq_curblocks = be64toh(dqb64->dqb_curblocks); 1783 dq->dq_ihardlimit = be64toh(dqb64->dqb_ihardlimit); 1784 dq->dq_isoftlimit = be64toh(dqb64->dqb_isoftlimit); 1785 dq->dq_curinodes = be64toh(dqb64->dqb_curinodes); 1786 dq->dq_btime = be64toh(dqb64->dqb_btime); 1787 dq->dq_itime = be64toh(dqb64->dqb_itime); 1788} 1789 1790/* 1791 * Convert dquot to 32-bit host-order structure. 1792 */ 1793static void 1794dq_dqb32(const struct dquot *dq, struct dqblk32 *dqb32) 1795{ 1796 1797 dqb32->dqb_bhardlimit = CLIP32(dq->dq_bhardlimit); 1798 dqb32->dqb_bsoftlimit = CLIP32(dq->dq_bsoftlimit); 1799 dqb32->dqb_curblocks = CLIP32(dq->dq_curblocks); 1800 dqb32->dqb_ihardlimit = CLIP32(dq->dq_ihardlimit); 1801 dqb32->dqb_isoftlimit = CLIP32(dq->dq_isoftlimit); 1802 dqb32->dqb_curinodes = CLIP32(dq->dq_curinodes); 1803 dqb32->dqb_btime = CLIP32(dq->dq_btime); 1804 dqb32->dqb_itime = CLIP32(dq->dq_itime); 1805} 1806 1807/* 1808 * Convert dquot to 64-bit network-order structure. 1809 */ 1810static void 1811dq_dqb64(const struct dquot *dq, struct dqblk64 *dqb64) 1812{ 1813 1814 dqb64->dqb_bhardlimit = htobe64(dq->dq_bhardlimit); 1815 dqb64->dqb_bsoftlimit = htobe64(dq->dq_bsoftlimit); 1816 dqb64->dqb_curblocks = htobe64(dq->dq_curblocks); 1817 dqb64->dqb_ihardlimit = htobe64(dq->dq_ihardlimit); 1818 dqb64->dqb_isoftlimit = htobe64(dq->dq_isoftlimit); 1819 dqb64->dqb_curinodes = htobe64(dq->dq_curinodes); 1820 dqb64->dqb_btime = htobe64(dq->dq_btime); 1821 dqb64->dqb_itime = htobe64(dq->dq_itime); 1822} 1823 1824/* 1825 * Convert 64-bit host-order structure to 32-bit host-order structure. 1826 */ 1827static void 1828dqb64_dqb32(const struct dqblk64 *dqb64, struct dqblk32 *dqb32) 1829{ 1830 1831 dqb32->dqb_bhardlimit = CLIP32(dqb64->dqb_bhardlimit); 1832 dqb32->dqb_bsoftlimit = CLIP32(dqb64->dqb_bsoftlimit); 1833 dqb32->dqb_curblocks = CLIP32(dqb64->dqb_curblocks); 1834 dqb32->dqb_ihardlimit = CLIP32(dqb64->dqb_ihardlimit); 1835 dqb32->dqb_isoftlimit = CLIP32(dqb64->dqb_isoftlimit); 1836 dqb32->dqb_curinodes = CLIP32(dqb64->dqb_curinodes); 1837 dqb32->dqb_btime = CLIP32(dqb64->dqb_btime); 1838 dqb32->dqb_itime = CLIP32(dqb64->dqb_itime); 1839} 1840 1841/* 1842 * Convert 32-bit host-order structure to 64-bit host-order structure. 1843 */ 1844static void 1845dqb32_dqb64(const struct dqblk32 *dqb32, struct dqblk64 *dqb64) 1846{ 1847 1848 dqb64->dqb_bhardlimit = dqb32->dqb_bhardlimit; 1849 dqb64->dqb_bsoftlimit = dqb32->dqb_bsoftlimit; 1850 dqb64->dqb_curblocks = dqb32->dqb_curblocks; 1851 dqb64->dqb_ihardlimit = dqb32->dqb_ihardlimit; 1852 dqb64->dqb_isoftlimit = dqb32->dqb_isoftlimit; 1853 dqb64->dqb_curinodes = dqb32->dqb_curinodes; 1854 dqb64->dqb_btime = dqb32->dqb_btime; 1855 dqb64->dqb_itime = dqb32->dqb_itime; 1856} 1857