1 /*- 2 * SPDX-License-Identifier: BSD-3-Clause 3 * 4 * Copyright (c) 1982, 1986, 1990, 1993, 1995 5 * The Regents of the University of California. All rights reserved. 6 * 7 * This code is derived from software contributed to Berkeley by 8 * Robert Elz at The University of Melbourne. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 3. Neither the name of the University nor the names of its contributors 19 * may be used to endorse or promote products derived from this software 20 * without specific prior written permission. 21 * 22 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 25 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 32 * SUCH DAMAGE. 33 */ 34 35 #include <sys/cdefs.h> 36 #include "opt_ffs.h" 37 38 #include <sys/param.h> 39 #include <sys/systm.h> 40 #include <sys/endian.h> 41 #include <sys/fcntl.h> 42 #include <sys/kernel.h> 43 #include <sys/lock.h> 44 #include <sys/malloc.h> 45 #include <sys/mount.h> 46 #include <sys/mutex.h> 47 #include <sys/namei.h> 48 #include <sys/priv.h> 49 #include <sys/proc.h> 50 #include <sys/socket.h> 51 #include <sys/stat.h> 52 #include <sys/sysctl.h> 53 #include <sys/vnode.h> 54 55 #include <ufs/ufs/extattr.h> 56 #include <ufs/ufs/quota.h> 57 #include <ufs/ufs/inode.h> 58 #include <ufs/ufs/ufsmount.h> 59 #include <ufs/ufs/ufs_extern.h> 60 61 CTASSERT(sizeof(struct dqblk64) == sizeof(struct dqhdr64)); 62 63 static int unprivileged_get_quota = 0; 64 SYSCTL_INT(_security_bsd, OID_AUTO, unprivileged_get_quota, CTLFLAG_RW, 65 &unprivileged_get_quota, 0, 66 "Unprivileged processes may retrieve quotas for other uids and gids"); 67 68 static MALLOC_DEFINE(M_DQUOT, "ufs_quota", "UFS quota entries"); 69 70 /* 71 * Quota name to error message mapping. 72 */ 73 static char *quotatypes[] = INITQFNAMES; 74 75 static int chkdqchg(struct inode *, ufs2_daddr_t, struct ucred *, int, int *); 76 static int chkiqchg(struct inode *, int, struct ucred *, int, int *); 77 static int dqopen(struct vnode *, struct ufsmount *, int); 78 static int dqget(struct vnode *, 79 uint64_t, struct ufsmount *, int, struct dquot **); 80 static int dqsync(struct vnode *, struct dquot *); 81 static int dqflush(struct vnode *); 82 static int quotaoff1(struct thread *td, struct mount *mp, int type); 83 static int quotaoff_inchange(struct thread *td, struct mount *mp, int type); 84 85 /* conversion functions - from_to() */ 86 static void dqb32_dq(const struct dqblk32 *, struct dquot *); 87 static void dqb64_dq(const struct dqblk64 *, struct dquot *); 88 static void dq_dqb32(const struct dquot *, struct dqblk32 *); 89 static void dq_dqb64(const struct dquot *, struct dqblk64 *); 90 static void dqb32_dqb64(const struct dqblk32 *, struct dqblk64 *); 91 static void dqb64_dqb32(const struct dqblk64 *, struct dqblk32 *); 92 93 #ifdef DIAGNOSTIC 94 static void dqref(struct dquot *); 95 static void chkdquot(struct inode *); 96 #endif 97 98 /* 99 * Set up the quotas for an inode. 100 * 101 * This routine completely defines the semantics of quotas. 102 * If other criterion want to be used to establish quotas, the 103 * MAXQUOTAS value in quota.h should be increased, and the 104 * additional dquots set up here. 105 */ 106 int 107 getinoquota(struct inode *ip) 108 { 109 struct ufsmount *ump; 110 struct vnode *vp; 111 int error; 112 113 vp = ITOV(ip); 114 115 /* 116 * Disk quotas must be turned off for system files. Currently 117 * snapshot and quota files. 118 */ 119 if ((vp->v_vflag & VV_SYSTEM) != 0) 120 return (0); 121 /* 122 * XXX: Turn off quotas for files with a negative UID or GID. 123 * This prevents the creation of 100GB+ quota files. 124 */ 125 if ((int)ip->i_uid < 0 || (int)ip->i_gid < 0) 126 return (0); 127 ump = VFSTOUFS(vp->v_mount); 128 /* 129 * Set up the user quota based on file uid. 130 * EINVAL means that quotas are not enabled. 131 */ 132 if ((error = 133 dqget(vp, ip->i_uid, ump, USRQUOTA, &ip->i_dquot[USRQUOTA])) && 134 error != EINVAL) 135 return (error); 136 /* 137 * Set up the group quota based on file gid. 138 * EINVAL means that quotas are not enabled. 139 */ 140 if ((error = 141 dqget(vp, ip->i_gid, ump, GRPQUOTA, &ip->i_dquot[GRPQUOTA])) && 142 error != EINVAL) 143 return (error); 144 return (0); 145 } 146 147 /* 148 * Update disk usage, and take corrective action. 149 */ 150 int 151 chkdq(struct inode *ip, ufs2_daddr_t change, struct ucred *cred, int flags) 152 { 153 struct dquot *dq; 154 ufs2_daddr_t ncurblocks; 155 struct vnode *vp = ITOV(ip); 156 int i, error, warn, do_check; 157 158 MPASS(cred != NOCRED || (flags & FORCE) != 0); 159 /* 160 * Disk quotas must be turned off for system files. Currently 161 * snapshot and quota files. 162 */ 163 if ((vp->v_vflag & VV_SYSTEM) != 0) 164 return (0); 165 /* 166 * XXX: Turn off quotas for files with a negative UID or GID. 167 * This prevents the creation of 100GB+ quota files. 168 */ 169 if ((int)ip->i_uid < 0 || (int)ip->i_gid < 0) 170 return (0); 171 #ifdef DIAGNOSTIC 172 if ((flags & CHOWN) == 0) 173 chkdquot(ip); 174 #endif 175 if (change == 0) 176 return (0); 177 if (change < 0) { 178 for (i = 0; i < MAXQUOTAS; i++) { 179 if ((dq = ip->i_dquot[i]) == NODQUOT) 180 continue; 181 DQI_LOCK(dq); 182 DQI_WAIT(dq, PINOD+1, "chkdq1"); 183 ncurblocks = dq->dq_curblocks + change; 184 if (ncurblocks >= 0) 185 dq->dq_curblocks = ncurblocks; 186 else 187 dq->dq_curblocks = 0; 188 dq->dq_flags &= ~DQ_BLKS; 189 dq->dq_flags |= DQ_MOD; 190 DQI_UNLOCK(dq); 191 } 192 return (0); 193 } 194 if ((flags & FORCE) == 0 && 195 priv_check_cred(cred, PRIV_VFS_EXCEEDQUOTA)) 196 do_check = 1; 197 else 198 do_check = 0; 199 for (i = 0; i < MAXQUOTAS; i++) { 200 if ((dq = ip->i_dquot[i]) == NODQUOT) 201 continue; 202 warn = 0; 203 DQI_LOCK(dq); 204 DQI_WAIT(dq, PINOD+1, "chkdq2"); 205 if (do_check) { 206 error = chkdqchg(ip, change, cred, i, &warn); 207 if (error) { 208 /* 209 * Roll back user quota changes when 210 * group quota failed. 211 */ 212 while (i > 0) { 213 --i; 214 dq = ip->i_dquot[i]; 215 if (dq == NODQUOT) 216 continue; 217 DQI_LOCK(dq); 218 DQI_WAIT(dq, PINOD+1, "chkdq3"); 219 ncurblocks = dq->dq_curblocks - change; 220 if (ncurblocks >= 0) 221 dq->dq_curblocks = ncurblocks; 222 else 223 dq->dq_curblocks = 0; 224 dq->dq_flags &= ~DQ_BLKS; 225 dq->dq_flags |= DQ_MOD; 226 DQI_UNLOCK(dq); 227 } 228 return (error); 229 } 230 } 231 /* Reset timer when crossing soft limit */ 232 if (dq->dq_curblocks + change >= dq->dq_bsoftlimit && 233 dq->dq_curblocks < dq->dq_bsoftlimit) 234 dq->dq_btime = time_second + ITOUMP(ip)->um_btime[i]; 235 dq->dq_curblocks += change; 236 dq->dq_flags |= DQ_MOD; 237 DQI_UNLOCK(dq); 238 if (warn) 239 uprintf("\n%s: warning, %s disk quota exceeded\n", 240 ITOVFS(ip)->mnt_stat.f_mntonname, 241 quotatypes[i]); 242 } 243 return (0); 244 } 245 246 /* 247 * Check for a valid change to a users allocation. 248 * Issue an error message if appropriate. 249 */ 250 static int 251 chkdqchg(struct inode *ip, ufs2_daddr_t change, struct ucred *cred, 252 int type, int *warn) 253 { 254 struct dquot *dq = ip->i_dquot[type]; 255 ufs2_daddr_t ncurblocks = dq->dq_curblocks + change; 256 257 /* 258 * If user would exceed their hard limit, disallow space allocation. 259 */ 260 if (ncurblocks >= dq->dq_bhardlimit && dq->dq_bhardlimit) { 261 if ((dq->dq_flags & DQ_BLKS) == 0 && 262 ip->i_uid == cred->cr_uid) { 263 dq->dq_flags |= DQ_BLKS; 264 DQI_UNLOCK(dq); 265 uprintf("\n%s: write failed, %s disk limit reached\n", 266 ITOVFS(ip)->mnt_stat.f_mntonname, 267 quotatypes[type]); 268 return (EDQUOT); 269 } 270 DQI_UNLOCK(dq); 271 return (EDQUOT); 272 } 273 /* 274 * If user is over their soft limit for too long, disallow space 275 * allocation. Reset time limit as they cross their soft limit. 276 */ 277 if (ncurblocks >= dq->dq_bsoftlimit && dq->dq_bsoftlimit) { 278 if (dq->dq_curblocks < dq->dq_bsoftlimit) { 279 dq->dq_btime = time_second + ITOUMP(ip)->um_btime[type]; 280 if (ip->i_uid == cred->cr_uid) 281 *warn = 1; 282 return (0); 283 } 284 if (time_second > dq->dq_btime) { 285 if ((dq->dq_flags & DQ_BLKS) == 0 && 286 ip->i_uid == cred->cr_uid) { 287 dq->dq_flags |= DQ_BLKS; 288 DQI_UNLOCK(dq); 289 uprintf("\n%s: write failed, %s " 290 "disk quota exceeded for too long\n", 291 ITOVFS(ip)->mnt_stat.f_mntonname, 292 quotatypes[type]); 293 return (EDQUOT); 294 } 295 DQI_UNLOCK(dq); 296 return (EDQUOT); 297 } 298 } 299 return (0); 300 } 301 302 /* 303 * Check the inode limit, applying corrective action. 304 */ 305 int 306 chkiq(struct inode *ip, int change, struct ucred *cred, int flags) 307 { 308 struct dquot *dq; 309 int i, error, warn, do_check; 310 311 MPASS(cred != NOCRED || (flags & FORCE) != 0); 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)) 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 + ITOUMP(ip)->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 ITOVFS(ip)->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 */ 389 static int 390 chkiqchg(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 ITOVFS(ip)->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 + ITOUMP(ip)->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 ITOVFS(ip)->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 */ 445 static void 446 chkdquot(struct inode *ip) 447 { 448 struct ufsmount *ump; 449 struct vnode *vp; 450 int i; 451 452 ump = ITOUMP(ip); 453 vp = ITOV(ip); 454 455 /* 456 * Disk quotas must be turned off for system files. Currently 457 * these are snapshots and quota files. 458 */ 459 if ((vp->v_vflag & VV_SYSTEM) != 0) 460 return; 461 /* 462 * XXX: Turn off quotas for files with a negative UID or GID. 463 * This prevents the creation of 100GB+ quota files. 464 */ 465 if ((int)ip->i_uid < 0 || (int)ip->i_gid < 0) 466 return; 467 468 UFS_LOCK(ump); 469 for (i = 0; i < MAXQUOTAS; i++) { 470 if (ump->um_quotas[i] == NULLVP || 471 (ump->um_qflags[i] & (QTF_OPENING|QTF_CLOSING))) 472 continue; 473 if (ip->i_dquot[i] == NODQUOT) { 474 UFS_UNLOCK(ump); 475 vn_printf(ITOV(ip), "chkdquot: missing dquot "); 476 panic("chkdquot: missing dquot"); 477 } 478 } 479 UFS_UNLOCK(ump); 480 } 481 #endif 482 483 /* 484 * Code to process quotactl commands. 485 */ 486 487 /* 488 * Q_QUOTAON - set up a quota file for a particular filesystem. 489 */ 490 int 491 quotaon(struct thread *td, struct mount *mp, int type, void *fname, 492 bool *mp_busy) 493 { 494 struct ufsmount *ump; 495 struct vnode *vp, **vpp; 496 struct vnode *mvp; 497 struct dquot *dq; 498 int error, flags; 499 struct nameidata nd; 500 501 error = priv_check(td, PRIV_UFS_QUOTAON); 502 if (error != 0) 503 return (error); 504 505 if ((mp->mnt_flag & MNT_RDONLY) != 0) 506 return (EROFS); 507 508 ump = VFSTOUFS(mp); 509 dq = NODQUOT; 510 511 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, fname); 512 flags = FREAD | FWRITE; 513 vfs_ref(mp); 514 KASSERT(*mp_busy, ("%s called without busied mount", __func__)); 515 vfs_unbusy(mp); 516 *mp_busy = false; 517 error = vn_open(&nd, &flags, 0, NULL); 518 if (error != 0) { 519 vfs_rel(mp); 520 return (error); 521 } 522 NDFREE_PNBUF(&nd); 523 vp = nd.ni_vp; 524 error = vfs_busy(mp, MBF_NOWAIT); 525 vfs_rel(mp); 526 if (error == 0) { 527 *mp_busy = true; 528 if (vp->v_type != VREG) 529 error = EACCES; 530 } 531 if (error != 0) { 532 VOP_UNLOCK(vp); 533 (void) vn_close(vp, FREAD|FWRITE, td->td_ucred, td); 534 return (error); 535 } 536 537 UFS_LOCK(ump); 538 if ((ump->um_qflags[type] & (QTF_OPENING|QTF_CLOSING)) != 0) { 539 UFS_UNLOCK(ump); 540 VOP_UNLOCK(vp); 541 (void) vn_close(vp, FREAD|FWRITE, td->td_ucred, td); 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); 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 return (error); 553 } 554 VOP_UNLOCK(vp); 555 MNT_ILOCK(mp); 556 mp->mnt_flag |= MNT_QUOTA; 557 mp->mnt_stat.f_flags |= 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); 580 *vpp = vp; 581 582 /* 583 * Allow the getdq from getinoquota below to read the quota 584 * from file. 585 */ 586 UFS_LOCK(ump); 587 ump->um_qflags[type] &= ~QTF_CLOSING; 588 UFS_UNLOCK(ump); 589 590 /* 591 * Save the credential of the process that turned on quotas. 592 * Set up the time limits for this quota. 593 */ 594 ump->um_cred[type] = crhold(td->td_ucred); 595 ump->um_btime[type] = MAX_DQ_TIME; 596 ump->um_itime[type] = MAX_IQ_TIME; 597 if (dqget(NULLVP, 0, ump, type, &dq) == 0) { 598 if (dq->dq_btime > 0) 599 ump->um_btime[type] = dq->dq_btime; 600 if (dq->dq_itime > 0) 601 ump->um_itime[type] = dq->dq_itime; 602 dqrele(NULLVP, dq); 603 } 604 /* 605 * Search vnodes associated with this mount point, 606 * adding references to quota file being opened. 607 * NB: only need to add dquot's for inodes being modified. 608 */ 609 again: 610 MNT_VNODE_FOREACH_ALL(vp, mp, mvp) { 611 if (vget(vp, LK_EXCLUSIVE | LK_INTERLOCK)) { 612 MNT_VNODE_FOREACH_ALL_ABORT(mp, mvp); 613 goto again; 614 } 615 if (vp->v_type == VNON || vp->v_writecount <= 0) { 616 vput(vp); 617 continue; 618 } 619 error = getinoquota(VTOI(vp)); 620 vput(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 return (error); 636 } 637 638 /* 639 * Main code to turn off disk quotas for a filesystem. Does not change 640 * flags. 641 */ 642 static int 643 quotaoff1(struct thread *td, struct mount *mp, int type) 644 { 645 struct vnode *vp; 646 struct vnode *qvp, *mvp; 647 struct ufsmount *ump; 648 struct dquot *dq; 649 struct inode *ip; 650 struct ucred *cr; 651 int error; 652 653 ump = VFSTOUFS(mp); 654 655 UFS_LOCK(ump); 656 KASSERT((ump->um_qflags[type] & QTF_CLOSING) != 0, 657 ("quotaoff1: flags are invalid")); 658 if ((qvp = ump->um_quotas[type]) == NULLVP) { 659 UFS_UNLOCK(ump); 660 return (0); 661 } 662 cr = ump->um_cred[type]; 663 UFS_UNLOCK(ump); 664 665 /* 666 * Search vnodes associated with this mount point, 667 * deleting any references to quota file being closed. 668 */ 669 again: 670 MNT_VNODE_FOREACH_ALL(vp, mp, mvp) { 671 if (vp->v_type == VNON) { 672 VI_UNLOCK(vp); 673 continue; 674 } 675 if (vget(vp, LK_EXCLUSIVE | LK_INTERLOCK)) { 676 MNT_VNODE_FOREACH_ALL_ABORT(mp, mvp); 677 goto again; 678 } 679 ip = VTOI(vp); 680 dq = ip->i_dquot[type]; 681 ip->i_dquot[type] = NODQUOT; 682 dqrele(vp, dq); 683 vput(vp); 684 } 685 686 error = dqflush(qvp); 687 if (error != 0) 688 return (error); 689 690 /* 691 * Clear um_quotas before closing the quota vnode to prevent 692 * access to the closed vnode from dqget/dqsync 693 */ 694 UFS_LOCK(ump); 695 ump->um_quotas[type] = NULLVP; 696 ump->um_cred[type] = NOCRED; 697 UFS_UNLOCK(ump); 698 699 vn_lock(qvp, LK_EXCLUSIVE | LK_RETRY); 700 qvp->v_vflag &= ~VV_SYSTEM; 701 VOP_UNLOCK(qvp); 702 error = vn_close(qvp, FREAD|FWRITE, td->td_ucred, td); 703 crfree(cr); 704 705 return (error); 706 } 707 708 static int 709 quotaoff_inchange1(struct thread *td, struct mount *mp, int type) 710 { 711 int error; 712 bool need_resume; 713 714 /* 715 * mp is already suspended on unmount. If not, suspend it, to 716 * avoid the situation where quotaoff operation eventually 717 * failing due to SU structures still keeping references on 718 * dquots, but vnode's references are already clean. This 719 * would cause quota accounting leak and asserts otherwise. 720 * Note that the thread has already called vn_start_write(). 721 */ 722 if (mp->mnt_susp_owner == td) { 723 need_resume = false; 724 } else { 725 error = vfs_write_suspend_umnt(mp); 726 if (error != 0) 727 return (error); 728 need_resume = true; 729 } 730 error = quotaoff1(td, mp, type); 731 if (need_resume) 732 vfs_write_resume(mp, VR_START_WRITE); 733 return (error); 734 } 735 736 /* 737 * Turns off quotas, assumes that ump->um_qflags are already checked 738 * and QTF_CLOSING is set to indicate operation in progress. Fixes 739 * ump->um_qflags and mp->mnt_flag after. 740 */ 741 int 742 quotaoff_inchange(struct thread *td, struct mount *mp, int type) 743 { 744 struct ufsmount *ump; 745 int error, i; 746 747 error = quotaoff_inchange1(td, mp, type); 748 749 ump = VFSTOUFS(mp); 750 UFS_LOCK(ump); 751 ump->um_qflags[type] &= ~QTF_CLOSING; 752 for (i = 0; i < MAXQUOTAS; i++) 753 if (ump->um_quotas[i] != NULLVP) 754 break; 755 if (i == MAXQUOTAS) { 756 MNT_ILOCK(mp); 757 mp->mnt_flag &= ~MNT_QUOTA; 758 mp->mnt_stat.f_flags &= ~MNT_QUOTA; 759 MNT_IUNLOCK(mp); 760 } 761 UFS_UNLOCK(ump); 762 return (error); 763 } 764 765 /* 766 * Q_QUOTAOFF - turn off disk quotas for a filesystem. 767 */ 768 int 769 quotaoff(struct thread *td, struct mount *mp, int type) 770 { 771 struct ufsmount *ump; 772 int error; 773 774 error = priv_check(td, PRIV_UFS_QUOTAOFF); 775 if (error) 776 return (error); 777 778 ump = VFSTOUFS(mp); 779 UFS_LOCK(ump); 780 if ((ump->um_qflags[type] & (QTF_OPENING|QTF_CLOSING)) != 0) { 781 UFS_UNLOCK(ump); 782 return (EALREADY); 783 } 784 ump->um_qflags[type] |= QTF_CLOSING; 785 UFS_UNLOCK(ump); 786 787 return (quotaoff_inchange(td, mp, type)); 788 } 789 790 /* 791 * Q_GETQUOTA - return current values in a dqblk structure. 792 */ 793 static int 794 _getquota(struct thread *td, struct mount *mp, uint64_t id, int type, 795 struct dqblk64 *dqb) 796 { 797 struct dquot *dq; 798 int error; 799 800 switch (type) { 801 case USRQUOTA: 802 if ((td->td_ucred->cr_uid != id) && !unprivileged_get_quota) { 803 error = priv_check(td, PRIV_VFS_GETQUOTA); 804 if (error) 805 return (error); 806 } 807 break; 808 809 case GRPQUOTA: 810 if (!groupmember(id, td->td_ucred) && 811 !unprivileged_get_quota) { 812 error = priv_check(td, PRIV_VFS_GETQUOTA); 813 if (error) 814 return (error); 815 } 816 break; 817 818 default: 819 return (EINVAL); 820 } 821 822 dq = NODQUOT; 823 error = dqget(NULLVP, id, VFSTOUFS(mp), type, &dq); 824 if (error) 825 return (error); 826 *dqb = dq->dq_dqb; 827 dqrele(NULLVP, dq); 828 return (error); 829 } 830 831 /* 832 * Q_SETQUOTA - assign an entire dqblk structure. 833 */ 834 static int 835 _setquota(struct thread *td, struct mount *mp, uint64_t id, int type, 836 struct dqblk64 *dqb) 837 { 838 struct dquot *dq; 839 struct dquot *ndq; 840 struct ufsmount *ump; 841 struct dqblk64 newlim; 842 int error; 843 844 error = priv_check(td, PRIV_VFS_SETQUOTA); 845 if (error) 846 return (error); 847 848 newlim = *dqb; 849 850 ndq = NODQUOT; 851 ump = VFSTOUFS(mp); 852 853 error = dqget(NULLVP, id, ump, type, &ndq); 854 if (error) 855 return (error); 856 dq = ndq; 857 DQI_LOCK(dq); 858 DQI_WAIT(dq, PINOD+1, "setqta"); 859 /* 860 * Copy all but the current values. 861 * Reset time limit if previously had no soft limit or were 862 * under it, but now have a soft limit and are over it. 863 */ 864 newlim.dqb_curblocks = dq->dq_curblocks; 865 newlim.dqb_curinodes = dq->dq_curinodes; 866 if (dq->dq_id != 0) { 867 newlim.dqb_btime = dq->dq_btime; 868 newlim.dqb_itime = dq->dq_itime; 869 } 870 if (newlim.dqb_bsoftlimit && 871 dq->dq_curblocks >= newlim.dqb_bsoftlimit && 872 (dq->dq_bsoftlimit == 0 || dq->dq_curblocks < dq->dq_bsoftlimit)) 873 newlim.dqb_btime = time_second + ump->um_btime[type]; 874 if (newlim.dqb_isoftlimit && 875 dq->dq_curinodes >= newlim.dqb_isoftlimit && 876 (dq->dq_isoftlimit == 0 || dq->dq_curinodes < dq->dq_isoftlimit)) 877 newlim.dqb_itime = time_second + ump->um_itime[type]; 878 dq->dq_dqb = newlim; 879 if (dq->dq_curblocks < dq->dq_bsoftlimit) 880 dq->dq_flags &= ~DQ_BLKS; 881 if (dq->dq_curinodes < dq->dq_isoftlimit) 882 dq->dq_flags &= ~DQ_INODS; 883 if (dq->dq_isoftlimit == 0 && dq->dq_bsoftlimit == 0 && 884 dq->dq_ihardlimit == 0 && dq->dq_bhardlimit == 0) 885 dq->dq_flags |= DQ_FAKE; 886 else 887 dq->dq_flags &= ~DQ_FAKE; 888 dq->dq_flags |= DQ_MOD; 889 DQI_UNLOCK(dq); 890 dqrele(NULLVP, dq); 891 return (0); 892 } 893 894 /* 895 * Q_SETUSE - set current inode and block usage. 896 */ 897 static int 898 _setuse(struct thread *td, struct mount *mp, uint64_t id, int type, 899 struct dqblk64 *dqb) 900 { 901 struct dquot *dq; 902 struct ufsmount *ump; 903 struct dquot *ndq; 904 struct dqblk64 usage; 905 int error; 906 907 error = priv_check(td, PRIV_UFS_SETUSE); 908 if (error) 909 return (error); 910 911 usage = *dqb; 912 913 ump = VFSTOUFS(mp); 914 ndq = NODQUOT; 915 916 error = dqget(NULLVP, id, ump, type, &ndq); 917 if (error) 918 return (error); 919 dq = ndq; 920 DQI_LOCK(dq); 921 DQI_WAIT(dq, PINOD+1, "setuse"); 922 /* 923 * Reset time limit if have a soft limit and were 924 * previously under it, but are now over it. 925 */ 926 if (dq->dq_bsoftlimit && dq->dq_curblocks < dq->dq_bsoftlimit && 927 usage.dqb_curblocks >= dq->dq_bsoftlimit) 928 dq->dq_btime = time_second + ump->um_btime[type]; 929 if (dq->dq_isoftlimit && dq->dq_curinodes < dq->dq_isoftlimit && 930 usage.dqb_curinodes >= dq->dq_isoftlimit) 931 dq->dq_itime = time_second + ump->um_itime[type]; 932 dq->dq_curblocks = usage.dqb_curblocks; 933 dq->dq_curinodes = usage.dqb_curinodes; 934 if (dq->dq_curblocks < dq->dq_bsoftlimit) 935 dq->dq_flags &= ~DQ_BLKS; 936 if (dq->dq_curinodes < dq->dq_isoftlimit) 937 dq->dq_flags &= ~DQ_INODS; 938 dq->dq_flags |= DQ_MOD; 939 DQI_UNLOCK(dq); 940 dqrele(NULLVP, dq); 941 return (0); 942 } 943 944 int 945 getquota32(struct thread *td, struct mount *mp, uint64_t id, int type, 946 void *addr) 947 { 948 struct dqblk32 dqb32; 949 struct dqblk64 dqb64; 950 int error; 951 952 error = _getquota(td, mp, id, type, &dqb64); 953 if (error) 954 return (error); 955 dqb64_dqb32(&dqb64, &dqb32); 956 error = copyout(&dqb32, addr, sizeof(dqb32)); 957 return (error); 958 } 959 960 int 961 setquota32(struct thread *td, struct mount *mp, uint64_t id, int type, 962 void *addr) 963 { 964 struct dqblk32 dqb32; 965 struct dqblk64 dqb64; 966 int error; 967 968 error = copyin(addr, &dqb32, sizeof(dqb32)); 969 if (error) 970 return (error); 971 dqb32_dqb64(&dqb32, &dqb64); 972 error = _setquota(td, mp, id, type, &dqb64); 973 return (error); 974 } 975 976 int 977 setuse32(struct thread *td, struct mount *mp, uint64_t id, int type, void *addr) 978 { 979 struct dqblk32 dqb32; 980 struct dqblk64 dqb64; 981 int error; 982 983 error = copyin(addr, &dqb32, sizeof(dqb32)); 984 if (error) 985 return (error); 986 dqb32_dqb64(&dqb32, &dqb64); 987 error = _setuse(td, mp, id, type, &dqb64); 988 return (error); 989 } 990 991 int 992 getquota(struct thread *td, struct mount *mp, uint64_t id, int type, void *addr) 993 { 994 struct dqblk64 dqb64; 995 int error; 996 997 error = _getquota(td, mp, id, type, &dqb64); 998 if (error) 999 return (error); 1000 error = copyout(&dqb64, addr, sizeof(dqb64)); 1001 return (error); 1002 } 1003 1004 int 1005 setquota(struct thread *td, struct mount *mp, uint64_t id, int type, void *addr) 1006 { 1007 struct dqblk64 dqb64; 1008 int error; 1009 1010 error = copyin(addr, &dqb64, sizeof(dqb64)); 1011 if (error) 1012 return (error); 1013 error = _setquota(td, mp, id, type, &dqb64); 1014 return (error); 1015 } 1016 1017 int 1018 setuse(struct thread *td, struct mount *mp, uint64_t id, int type, void *addr) 1019 { 1020 struct dqblk64 dqb64; 1021 int error; 1022 1023 error = copyin(addr, &dqb64, sizeof(dqb64)); 1024 if (error) 1025 return (error); 1026 error = _setuse(td, mp, id, type, &dqb64); 1027 return (error); 1028 } 1029 1030 /* 1031 * Q_GETQUOTASIZE - get bit-size of quota file fields 1032 */ 1033 int 1034 getquotasize(struct thread *td, struct mount *mp, uint64_t id, int type, 1035 void *sizep) 1036 { 1037 struct ufsmount *ump = VFSTOUFS(mp); 1038 int bitsize; 1039 1040 UFS_LOCK(ump); 1041 if (ump->um_quotas[type] == NULLVP || 1042 (ump->um_qflags[type] & QTF_CLOSING)) { 1043 UFS_UNLOCK(ump); 1044 return (EINVAL); 1045 } 1046 if ((ump->um_qflags[type] & QTF_64BIT) != 0) 1047 bitsize = 64; 1048 else 1049 bitsize = 32; 1050 UFS_UNLOCK(ump); 1051 return (copyout(&bitsize, sizep, sizeof(int))); 1052 } 1053 1054 /* 1055 * Q_SYNC - sync quota files to disk. 1056 */ 1057 int 1058 qsync(struct mount *mp) 1059 { 1060 struct ufsmount *ump = VFSTOUFS(mp); 1061 struct vnode *vp, *mvp; 1062 struct dquot *dq; 1063 int i, error; 1064 1065 /* 1066 * Check if the mount point has any quotas. 1067 * If not, simply return. 1068 */ 1069 for (i = 0; i < MAXQUOTAS; i++) 1070 if (ump->um_quotas[i] != NULLVP) 1071 break; 1072 if (i == MAXQUOTAS) 1073 return (0); 1074 /* 1075 * Search vnodes associated with this mount point, 1076 * synchronizing any modified dquot structures. 1077 */ 1078 again: 1079 MNT_VNODE_FOREACH_ALL(vp, mp, mvp) { 1080 if (vp->v_type == VNON) { 1081 VI_UNLOCK(vp); 1082 continue; 1083 } 1084 error = vget(vp, LK_EXCLUSIVE | LK_INTERLOCK); 1085 if (error) { 1086 if (error == ENOENT) { 1087 MNT_VNODE_FOREACH_ALL_ABORT(mp, mvp); 1088 goto again; 1089 } 1090 continue; 1091 } 1092 for (i = 0; i < MAXQUOTAS; i++) { 1093 dq = VTOI(vp)->i_dquot[i]; 1094 if (dq != NODQUOT) 1095 dqsync(vp, dq); 1096 } 1097 vput(vp); 1098 } 1099 return (0); 1100 } 1101 1102 /* 1103 * Sync quota file for given vnode to disk. 1104 */ 1105 int 1106 qsyncvp(struct vnode *vp) 1107 { 1108 struct ufsmount *ump = VFSTOUFS(vp->v_mount); 1109 struct dquot *dq; 1110 int i; 1111 1112 /* 1113 * Check if the mount point has any quotas. 1114 * If not, simply return. 1115 */ 1116 for (i = 0; i < MAXQUOTAS; i++) 1117 if (ump->um_quotas[i] != NULLVP) 1118 break; 1119 if (i == MAXQUOTAS) 1120 return (0); 1121 /* 1122 * Search quotas associated with this vnode 1123 * synchronizing any modified dquot structures. 1124 */ 1125 for (i = 0; i < MAXQUOTAS; i++) { 1126 dq = VTOI(vp)->i_dquot[i]; 1127 if (dq != NODQUOT) 1128 dqsync(vp, dq); 1129 } 1130 return (0); 1131 } 1132 1133 /* 1134 * Code pertaining to management of the in-core dquot data structures. 1135 */ 1136 #define DQHASH(dqvp, id) \ 1137 (&dqhashtbl[((((intptr_t)(dqvp)) >> 8) + id) & dqhash]) 1138 static LIST_HEAD(dqhash, dquot) *dqhashtbl; 1139 static u_long dqhash; 1140 1141 /* 1142 * Dquot free list. 1143 */ 1144 #define DQUOTINC 5 /* minimum free dquots desired */ 1145 static TAILQ_HEAD(dqfreelist, dquot) dqfreelist; 1146 static long numdquot, desireddquot = DQUOTINC; 1147 1148 /* 1149 * Lock to protect quota hash, dq free list and dq_cnt ref counters of 1150 * _all_ dqs. 1151 */ 1152 struct mtx dqhlock; 1153 1154 #define DQH_LOCK() mtx_lock(&dqhlock) 1155 #define DQH_UNLOCK() mtx_unlock(&dqhlock) 1156 1157 static struct dquot *dqhashfind(struct dqhash *dqh, uint64_t id, 1158 struct vnode *dqvp); 1159 1160 /* 1161 * Initialize the quota system. 1162 */ 1163 void 1164 dqinit(void) 1165 { 1166 1167 mtx_init(&dqhlock, "dqhlock", NULL, MTX_DEF); 1168 dqhashtbl = hashinit(desiredvnodes, M_DQUOT, &dqhash); 1169 TAILQ_INIT(&dqfreelist); 1170 } 1171 1172 /* 1173 * Shut down the quota system. 1174 */ 1175 void 1176 dquninit(void) 1177 { 1178 struct dquot *dq; 1179 1180 hashdestroy(dqhashtbl, M_DQUOT, dqhash); 1181 while ((dq = TAILQ_FIRST(&dqfreelist)) != NULL) { 1182 TAILQ_REMOVE(&dqfreelist, dq, dq_freelist); 1183 mtx_destroy(&dq->dq_lock); 1184 free(dq, M_DQUOT); 1185 } 1186 mtx_destroy(&dqhlock); 1187 } 1188 1189 static struct dquot * 1190 dqhashfind(struct dqhash *dqh, uint64_t id, struct vnode *dqvp) 1191 { 1192 struct dquot *dq; 1193 1194 mtx_assert(&dqhlock, MA_OWNED); 1195 LIST_FOREACH(dq, dqh, dq_hash) { 1196 if (dq->dq_id != id || 1197 dq->dq_ump->um_quotas[dq->dq_type] != dqvp) 1198 continue; 1199 /* 1200 * Cache hit with no references. Take 1201 * the structure off the free list. 1202 */ 1203 if (dq->dq_cnt == 0) 1204 TAILQ_REMOVE(&dqfreelist, dq, dq_freelist); 1205 DQREF(dq); 1206 return (dq); 1207 } 1208 return (NODQUOT); 1209 } 1210 1211 /* 1212 * Determine the quota file type. 1213 * 1214 * A 32-bit quota file is simply an array of struct dqblk32. 1215 * 1216 * A 64-bit quota file is a struct dqhdr64 followed by an array of struct 1217 * dqblk64. The header contains various magic bits which allow us to be 1218 * reasonably confident that it is indeeda 64-bit quota file and not just 1219 * a 32-bit quota file that just happens to "look right". 1220 * 1221 */ 1222 static int 1223 dqopen(struct vnode *vp, struct ufsmount *ump, int type) 1224 { 1225 struct dqhdr64 dqh; 1226 struct iovec aiov; 1227 struct uio auio; 1228 int error; 1229 1230 ASSERT_VOP_LOCKED(vp, "dqopen"); 1231 auio.uio_iov = &aiov; 1232 auio.uio_iovcnt = 1; 1233 aiov.iov_base = &dqh; 1234 aiov.iov_len = sizeof(dqh); 1235 auio.uio_resid = sizeof(dqh); 1236 auio.uio_offset = 0; 1237 auio.uio_segflg = UIO_SYSSPACE; 1238 auio.uio_rw = UIO_READ; 1239 auio.uio_td = (struct thread *)0; 1240 error = VOP_READ(vp, &auio, 0, ump->um_cred[type]); 1241 1242 if (error != 0) 1243 return (error); 1244 if (auio.uio_resid > 0) { 1245 /* assume 32 bits */ 1246 return (0); 1247 } 1248 1249 UFS_LOCK(ump); 1250 if (strcmp(dqh.dqh_magic, Q_DQHDR64_MAGIC) == 0 && 1251 be32toh(dqh.dqh_version) == Q_DQHDR64_VERSION && 1252 be32toh(dqh.dqh_hdrlen) == (uint32_t)sizeof(struct dqhdr64) && 1253 be32toh(dqh.dqh_reclen) == (uint32_t)sizeof(struct dqblk64)) { 1254 /* XXX: what if the magic matches, but the sizes are wrong? */ 1255 ump->um_qflags[type] |= QTF_64BIT; 1256 } else { 1257 ump->um_qflags[type] &= ~QTF_64BIT; 1258 } 1259 UFS_UNLOCK(ump); 1260 1261 return (0); 1262 } 1263 1264 /* 1265 * Obtain a dquot structure for the specified identifier and quota file 1266 * reading the information from the file if necessary. 1267 */ 1268 static int 1269 dqget(struct vnode *vp, uint64_t id, struct ufsmount *ump, int type, 1270 struct dquot **dqp) 1271 { 1272 uint8_t buf[sizeof(struct dqblk64)]; 1273 off_t base, recsize; 1274 struct dquot *dq, *dq1; 1275 struct dqhash *dqh; 1276 struct vnode *dqvp; 1277 struct iovec aiov; 1278 struct uio auio; 1279 int dqvplocked, error; 1280 1281 #ifdef DEBUG_VFS_LOCKS 1282 if (vp != NULLVP) 1283 ASSERT_VOP_ELOCKED(vp, "dqget"); 1284 #endif 1285 1286 if (vp != NULLVP && *dqp != NODQUOT) { 1287 return (0); 1288 } 1289 1290 /* XXX: Disallow negative id values to prevent the 1291 * creation of 100GB+ quota data files. 1292 */ 1293 if ((int)id < 0) 1294 return (EINVAL); 1295 1296 UFS_LOCK(ump); 1297 dqvp = ump->um_quotas[type]; 1298 if (dqvp == NULLVP || (ump->um_qflags[type] & QTF_CLOSING)) { 1299 *dqp = NODQUOT; 1300 UFS_UNLOCK(ump); 1301 return (EINVAL); 1302 } 1303 vref(dqvp); 1304 UFS_UNLOCK(ump); 1305 error = 0; 1306 dqvplocked = 0; 1307 1308 /* 1309 * Check the cache first. 1310 */ 1311 dqh = DQHASH(dqvp, id); 1312 DQH_LOCK(); 1313 dq = dqhashfind(dqh, id, dqvp); 1314 if (dq != NULL) { 1315 DQH_UNLOCK(); 1316 hfound: DQI_LOCK(dq); 1317 DQI_WAIT(dq, PINOD+1, "dqget"); 1318 DQI_UNLOCK(dq); 1319 if (dq->dq_ump == NULL) { 1320 dqrele(vp, dq); 1321 dq = NODQUOT; 1322 error = EIO; 1323 } 1324 *dqp = dq; 1325 if (dqvplocked) 1326 vput(dqvp); 1327 else 1328 vrele(dqvp); 1329 return (error); 1330 } 1331 1332 /* 1333 * Quota vnode lock is before DQ_LOCK. Acquire dqvp lock there 1334 * since new dq will appear on the hash chain DQ_LOCKed. 1335 */ 1336 if (vp != dqvp) { 1337 DQH_UNLOCK(); 1338 vn_lock(dqvp, LK_SHARED | LK_RETRY); 1339 dqvplocked = 1; 1340 DQH_LOCK(); 1341 /* 1342 * Recheck the cache after sleep for quota vnode lock. 1343 */ 1344 dq = dqhashfind(dqh, id, dqvp); 1345 if (dq != NULL) { 1346 DQH_UNLOCK(); 1347 goto hfound; 1348 } 1349 } 1350 1351 /* 1352 * Not in cache, allocate a new one or take it from the 1353 * free list. 1354 */ 1355 if (TAILQ_FIRST(&dqfreelist) == NODQUOT && 1356 numdquot < MAXQUOTAS * desiredvnodes) 1357 desireddquot += DQUOTINC; 1358 if (numdquot < desireddquot) { 1359 numdquot++; 1360 DQH_UNLOCK(); 1361 dq1 = malloc(sizeof *dq1, M_DQUOT, M_WAITOK | M_ZERO); 1362 mtx_init(&dq1->dq_lock, "dqlock", NULL, MTX_DEF); 1363 DQH_LOCK(); 1364 /* 1365 * Recheck the cache after sleep for memory. 1366 */ 1367 dq = dqhashfind(dqh, id, dqvp); 1368 if (dq != NULL) { 1369 numdquot--; 1370 DQH_UNLOCK(); 1371 mtx_destroy(&dq1->dq_lock); 1372 free(dq1, M_DQUOT); 1373 goto hfound; 1374 } 1375 dq = dq1; 1376 } else { 1377 if ((dq = TAILQ_FIRST(&dqfreelist)) == NULL) { 1378 DQH_UNLOCK(); 1379 tablefull("dquot"); 1380 *dqp = NODQUOT; 1381 if (dqvplocked) 1382 vput(dqvp); 1383 else 1384 vrele(dqvp); 1385 return (EUSERS); 1386 } 1387 if (dq->dq_cnt || (dq->dq_flags & DQ_MOD)) 1388 panic("dqget: free dquot isn't %p", dq); 1389 TAILQ_REMOVE(&dqfreelist, dq, dq_freelist); 1390 if (dq->dq_ump != NULL) 1391 LIST_REMOVE(dq, dq_hash); 1392 } 1393 1394 /* 1395 * Dq is put into hash already locked to prevent parallel 1396 * usage while it is being read from file. 1397 */ 1398 dq->dq_flags = DQ_LOCK; 1399 dq->dq_id = id; 1400 dq->dq_type = type; 1401 dq->dq_ump = ump; 1402 LIST_INSERT_HEAD(dqh, dq, dq_hash); 1403 DQREF(dq); 1404 DQH_UNLOCK(); 1405 1406 /* 1407 * Read the requested quota record from the quota file, performing 1408 * any necessary conversions. 1409 */ 1410 if (ump->um_qflags[type] & QTF_64BIT) { 1411 recsize = sizeof(struct dqblk64); 1412 base = sizeof(struct dqhdr64); 1413 } else { 1414 recsize = sizeof(struct dqblk32); 1415 base = 0; 1416 } 1417 auio.uio_iov = &aiov; 1418 auio.uio_iovcnt = 1; 1419 aiov.iov_base = buf; 1420 aiov.iov_len = recsize; 1421 auio.uio_resid = recsize; 1422 auio.uio_offset = base + id * recsize; 1423 auio.uio_segflg = UIO_SYSSPACE; 1424 auio.uio_rw = UIO_READ; 1425 auio.uio_td = (struct thread *)0; 1426 1427 error = VOP_READ(dqvp, &auio, 0, ump->um_cred[type]); 1428 if (auio.uio_resid == recsize && error == 0) { 1429 bzero(&dq->dq_dqb, sizeof(dq->dq_dqb)); 1430 } else { 1431 if (ump->um_qflags[type] & QTF_64BIT) 1432 dqb64_dq((struct dqblk64 *)buf, dq); 1433 else 1434 dqb32_dq((struct dqblk32 *)buf, dq); 1435 } 1436 if (dqvplocked) 1437 vput(dqvp); 1438 else 1439 vrele(dqvp); 1440 /* 1441 * I/O error in reading quota file, release 1442 * quota structure and reflect problem to caller. 1443 */ 1444 if (error) { 1445 DQH_LOCK(); 1446 dq->dq_ump = NULL; 1447 LIST_REMOVE(dq, dq_hash); 1448 DQH_UNLOCK(); 1449 DQI_LOCK(dq); 1450 if (dq->dq_flags & DQ_WANT) 1451 wakeup(dq); 1452 dq->dq_flags = 0; 1453 DQI_UNLOCK(dq); 1454 dqrele(vp, dq); 1455 *dqp = NODQUOT; 1456 return (error); 1457 } 1458 DQI_LOCK(dq); 1459 /* 1460 * Check for no limit to enforce. 1461 * Initialize time values if necessary. 1462 */ 1463 if (dq->dq_isoftlimit == 0 && dq->dq_bsoftlimit == 0 && 1464 dq->dq_ihardlimit == 0 && dq->dq_bhardlimit == 0) 1465 dq->dq_flags |= DQ_FAKE; 1466 if (dq->dq_id != 0) { 1467 if (dq->dq_btime == 0) { 1468 dq->dq_btime = time_second + ump->um_btime[type]; 1469 if (dq->dq_bsoftlimit && 1470 dq->dq_curblocks >= dq->dq_bsoftlimit) 1471 dq->dq_flags |= DQ_MOD; 1472 } 1473 if (dq->dq_itime == 0) { 1474 dq->dq_itime = time_second + ump->um_itime[type]; 1475 if (dq->dq_isoftlimit && 1476 dq->dq_curinodes >= dq->dq_isoftlimit) 1477 dq->dq_flags |= DQ_MOD; 1478 } 1479 } 1480 DQI_WAKEUP(dq); 1481 DQI_UNLOCK(dq); 1482 *dqp = dq; 1483 return (0); 1484 } 1485 1486 #ifdef DIAGNOSTIC 1487 /* 1488 * Obtain a reference to a dquot. 1489 */ 1490 static void 1491 dqref(struct dquot *dq) 1492 { 1493 1494 dq->dq_cnt++; 1495 } 1496 #endif 1497 1498 /* 1499 * Release a reference to a dquot. 1500 */ 1501 void 1502 dqrele(struct vnode *vp, struct dquot *dq) 1503 { 1504 1505 if (dq == NODQUOT) 1506 return; 1507 DQH_LOCK(); 1508 KASSERT(dq->dq_cnt > 0, ("Lost dq %p reference 1", dq)); 1509 if (dq->dq_cnt > 1) { 1510 dq->dq_cnt--; 1511 DQH_UNLOCK(); 1512 return; 1513 } 1514 DQH_UNLOCK(); 1515 sync: 1516 (void) dqsync(vp, dq); 1517 1518 DQH_LOCK(); 1519 KASSERT(dq->dq_cnt > 0, ("Lost dq %p reference 2", dq)); 1520 if (--dq->dq_cnt > 0) 1521 { 1522 DQH_UNLOCK(); 1523 return; 1524 } 1525 1526 /* 1527 * The dq may become dirty after it is synced but before it is 1528 * put to the free list. Checking the DQ_MOD there without 1529 * locking dq should be safe since no other references to the 1530 * dq exist. 1531 */ 1532 if ((dq->dq_flags & DQ_MOD) != 0) { 1533 dq->dq_cnt++; 1534 DQH_UNLOCK(); 1535 goto sync; 1536 } 1537 TAILQ_INSERT_TAIL(&dqfreelist, dq, dq_freelist); 1538 DQH_UNLOCK(); 1539 } 1540 1541 /* 1542 * Update the disk quota in the quota file. 1543 */ 1544 static int 1545 dqsync(struct vnode *vp, struct dquot *dq) 1546 { 1547 uint8_t buf[sizeof(struct dqblk64)]; 1548 off_t base, recsize; 1549 struct vnode *dqvp; 1550 struct iovec aiov; 1551 struct uio auio; 1552 int error; 1553 struct mount *mp; 1554 struct ufsmount *ump; 1555 1556 #ifdef DEBUG_VFS_LOCKS 1557 if (vp != NULL) 1558 ASSERT_VOP_ELOCKED(vp, "dqsync"); 1559 #endif 1560 1561 mp = NULL; 1562 error = 0; 1563 if (dq == NODQUOT) 1564 panic("dqsync: dquot"); 1565 if ((ump = dq->dq_ump) == NULL) 1566 return (0); 1567 UFS_LOCK(ump); 1568 if ((dqvp = ump->um_quotas[dq->dq_type]) == NULLVP) { 1569 if (vp == NULL) { 1570 UFS_UNLOCK(ump); 1571 return (0); 1572 } else 1573 panic("dqsync: file"); 1574 } 1575 vref(dqvp); 1576 UFS_UNLOCK(ump); 1577 1578 DQI_LOCK(dq); 1579 if ((dq->dq_flags & DQ_MOD) == 0) { 1580 DQI_UNLOCK(dq); 1581 vrele(dqvp); 1582 return (0); 1583 } 1584 DQI_UNLOCK(dq); 1585 1586 (void) vn_start_secondary_write(dqvp, &mp, V_WAIT); 1587 if (vp != dqvp) 1588 vn_lock(dqvp, LK_EXCLUSIVE | LK_RETRY); 1589 1590 DQI_LOCK(dq); 1591 DQI_WAIT(dq, PINOD+2, "dqsync"); 1592 if ((dq->dq_flags & DQ_MOD) == 0) 1593 goto out; 1594 dq->dq_flags |= DQ_LOCK; 1595 DQI_UNLOCK(dq); 1596 1597 /* 1598 * Write the quota record to the quota file, performing any 1599 * necessary conversions. See dqget() for additional details. 1600 */ 1601 if (ump->um_qflags[dq->dq_type] & QTF_64BIT) { 1602 dq_dqb64(dq, (struct dqblk64 *)buf); 1603 recsize = sizeof(struct dqblk64); 1604 base = sizeof(struct dqhdr64); 1605 } else { 1606 dq_dqb32(dq, (struct dqblk32 *)buf); 1607 recsize = sizeof(struct dqblk32); 1608 base = 0; 1609 } 1610 1611 auio.uio_iov = &aiov; 1612 auio.uio_iovcnt = 1; 1613 aiov.iov_base = buf; 1614 aiov.iov_len = recsize; 1615 auio.uio_resid = recsize; 1616 auio.uio_offset = base + dq->dq_id * recsize; 1617 auio.uio_segflg = UIO_SYSSPACE; 1618 auio.uio_rw = UIO_WRITE; 1619 auio.uio_td = (struct thread *)0; 1620 error = VOP_WRITE(dqvp, &auio, 0, dq->dq_ump->um_cred[dq->dq_type]); 1621 if (auio.uio_resid && error == 0) 1622 error = EIO; 1623 1624 DQI_LOCK(dq); 1625 DQI_WAKEUP(dq); 1626 dq->dq_flags &= ~DQ_MOD; 1627 out: 1628 DQI_UNLOCK(dq); 1629 if (vp != dqvp) 1630 vput(dqvp); 1631 else 1632 vrele(dqvp); 1633 vn_finished_secondary_write(mp); 1634 return (error); 1635 } 1636 1637 /* 1638 * Flush all entries from the cache for a particular vnode. 1639 */ 1640 static int 1641 dqflush(struct vnode *vp) 1642 { 1643 struct dquot *dq, *nextdq; 1644 struct dqhash *dqh; 1645 int error; 1646 1647 /* 1648 * Move all dquot's that used to refer to this quota 1649 * file off their hash chains (they will eventually 1650 * fall off the head of the free list and be re-used). 1651 */ 1652 error = 0; 1653 DQH_LOCK(); 1654 for (dqh = &dqhashtbl[dqhash]; dqh >= dqhashtbl; dqh--) { 1655 for (dq = LIST_FIRST(dqh); dq; dq = nextdq) { 1656 nextdq = LIST_NEXT(dq, dq_hash); 1657 if (dq->dq_ump->um_quotas[dq->dq_type] != vp) 1658 continue; 1659 if (dq->dq_cnt) 1660 error = EBUSY; 1661 else { 1662 LIST_REMOVE(dq, dq_hash); 1663 dq->dq_ump = NULL; 1664 } 1665 } 1666 } 1667 DQH_UNLOCK(); 1668 return (error); 1669 } 1670 1671 /* 1672 * The following three functions are provided for the adjustment of 1673 * quotas by the soft updates code. 1674 */ 1675 #ifdef SOFTUPDATES 1676 /* 1677 * Acquire a reference to the quota structures associated with a vnode. 1678 * Return count of number of quota structures found. 1679 */ 1680 int 1681 quotaref(struct vnode *vp, struct dquot **qrp) 1682 { 1683 struct inode *ip; 1684 struct dquot *dq; 1685 int i, found; 1686 1687 for (i = 0; i < MAXQUOTAS; i++) 1688 qrp[i] = NODQUOT; 1689 /* 1690 * Disk quotas must be turned off for system files. Currently 1691 * snapshot and quota files. 1692 */ 1693 if ((vp->v_vflag & VV_SYSTEM) != 0) 1694 return (0); 1695 /* 1696 * Iterate through and copy active quotas. 1697 */ 1698 found = 0; 1699 ip = VTOI(vp); 1700 mtx_lock(&dqhlock); 1701 for (i = 0; i < MAXQUOTAS; i++) { 1702 if ((dq = ip->i_dquot[i]) == NODQUOT) 1703 continue; 1704 DQREF(dq); 1705 qrp[i] = dq; 1706 found++; 1707 } 1708 mtx_unlock(&dqhlock); 1709 return (found); 1710 } 1711 1712 /* 1713 * Release a set of quota structures obtained from a vnode. 1714 */ 1715 void 1716 quotarele(struct dquot **qrp) 1717 { 1718 struct dquot *dq; 1719 int i; 1720 1721 for (i = 0; i < MAXQUOTAS; i++) { 1722 if ((dq = qrp[i]) == NODQUOT) 1723 continue; 1724 dqrele(NULL, dq); 1725 } 1726 } 1727 1728 /* 1729 * Adjust the number of blocks associated with a quota. 1730 * Positive numbers when adding blocks; negative numbers when freeing blocks. 1731 */ 1732 void 1733 quotaadj(struct dquot **qrp, struct ufsmount *ump, int64_t blkcount) 1734 { 1735 struct dquot *dq; 1736 ufs2_daddr_t ncurblocks; 1737 int i; 1738 1739 if (blkcount == 0) 1740 return; 1741 for (i = 0; i < MAXQUOTAS; i++) { 1742 if ((dq = qrp[i]) == NODQUOT) 1743 continue; 1744 DQI_LOCK(dq); 1745 DQI_WAIT(dq, PINOD+1, "adjqta"); 1746 ncurblocks = dq->dq_curblocks + blkcount; 1747 if (ncurblocks >= 0) 1748 dq->dq_curblocks = ncurblocks; 1749 else 1750 dq->dq_curblocks = 0; 1751 if (blkcount < 0) 1752 dq->dq_flags &= ~DQ_BLKS; 1753 else if (dq->dq_curblocks + blkcount >= dq->dq_bsoftlimit && 1754 dq->dq_curblocks < dq->dq_bsoftlimit) 1755 dq->dq_btime = time_second + ump->um_btime[i]; 1756 dq->dq_flags |= DQ_MOD; 1757 DQI_UNLOCK(dq); 1758 } 1759 } 1760 #endif /* SOFTUPDATES */ 1761 1762 /* 1763 * 32-bit / 64-bit conversion functions. 1764 * 1765 * 32-bit quota records are stored in native byte order. Attention must 1766 * be paid to overflow issues. 1767 * 1768 * 64-bit quota records are stored in network byte order. 1769 */ 1770 1771 #define CLIP32(u64) (u64 > UINT32_MAX ? UINT32_MAX : (uint32_t)u64) 1772 1773 /* 1774 * Convert 32-bit host-order structure to dquot. 1775 */ 1776 static void 1777 dqb32_dq(const struct dqblk32 *dqb32, struct dquot *dq) 1778 { 1779 1780 dq->dq_bhardlimit = dqb32->dqb_bhardlimit; 1781 dq->dq_bsoftlimit = dqb32->dqb_bsoftlimit; 1782 dq->dq_curblocks = dqb32->dqb_curblocks; 1783 dq->dq_ihardlimit = dqb32->dqb_ihardlimit; 1784 dq->dq_isoftlimit = dqb32->dqb_isoftlimit; 1785 dq->dq_curinodes = dqb32->dqb_curinodes; 1786 dq->dq_btime = dqb32->dqb_btime; 1787 dq->dq_itime = dqb32->dqb_itime; 1788 } 1789 1790 /* 1791 * Convert 64-bit network-order structure to dquot. 1792 */ 1793 static void 1794 dqb64_dq(const struct dqblk64 *dqb64, struct dquot *dq) 1795 { 1796 1797 dq->dq_bhardlimit = be64toh(dqb64->dqb_bhardlimit); 1798 dq->dq_bsoftlimit = be64toh(dqb64->dqb_bsoftlimit); 1799 dq->dq_curblocks = be64toh(dqb64->dqb_curblocks); 1800 dq->dq_ihardlimit = be64toh(dqb64->dqb_ihardlimit); 1801 dq->dq_isoftlimit = be64toh(dqb64->dqb_isoftlimit); 1802 dq->dq_curinodes = be64toh(dqb64->dqb_curinodes); 1803 dq->dq_btime = be64toh(dqb64->dqb_btime); 1804 dq->dq_itime = be64toh(dqb64->dqb_itime); 1805 } 1806 1807 /* 1808 * Convert dquot to 32-bit host-order structure. 1809 */ 1810 static void 1811 dq_dqb32(const struct dquot *dq, struct dqblk32 *dqb32) 1812 { 1813 1814 dqb32->dqb_bhardlimit = CLIP32(dq->dq_bhardlimit); 1815 dqb32->dqb_bsoftlimit = CLIP32(dq->dq_bsoftlimit); 1816 dqb32->dqb_curblocks = CLIP32(dq->dq_curblocks); 1817 dqb32->dqb_ihardlimit = CLIP32(dq->dq_ihardlimit); 1818 dqb32->dqb_isoftlimit = CLIP32(dq->dq_isoftlimit); 1819 dqb32->dqb_curinodes = CLIP32(dq->dq_curinodes); 1820 dqb32->dqb_btime = CLIP32(dq->dq_btime); 1821 dqb32->dqb_itime = CLIP32(dq->dq_itime); 1822 } 1823 1824 /* 1825 * Convert dquot to 64-bit network-order structure. 1826 */ 1827 static void 1828 dq_dqb64(const struct dquot *dq, struct dqblk64 *dqb64) 1829 { 1830 1831 dqb64->dqb_bhardlimit = htobe64(dq->dq_bhardlimit); 1832 dqb64->dqb_bsoftlimit = htobe64(dq->dq_bsoftlimit); 1833 dqb64->dqb_curblocks = htobe64(dq->dq_curblocks); 1834 dqb64->dqb_ihardlimit = htobe64(dq->dq_ihardlimit); 1835 dqb64->dqb_isoftlimit = htobe64(dq->dq_isoftlimit); 1836 dqb64->dqb_curinodes = htobe64(dq->dq_curinodes); 1837 dqb64->dqb_btime = htobe64(dq->dq_btime); 1838 dqb64->dqb_itime = htobe64(dq->dq_itime); 1839 } 1840 1841 /* 1842 * Convert 64-bit host-order structure to 32-bit host-order structure. 1843 */ 1844 static void 1845 dqb64_dqb32(const struct dqblk64 *dqb64, struct dqblk32 *dqb32) 1846 { 1847 1848 dqb32->dqb_bhardlimit = CLIP32(dqb64->dqb_bhardlimit); 1849 dqb32->dqb_bsoftlimit = CLIP32(dqb64->dqb_bsoftlimit); 1850 dqb32->dqb_curblocks = CLIP32(dqb64->dqb_curblocks); 1851 dqb32->dqb_ihardlimit = CLIP32(dqb64->dqb_ihardlimit); 1852 dqb32->dqb_isoftlimit = CLIP32(dqb64->dqb_isoftlimit); 1853 dqb32->dqb_curinodes = CLIP32(dqb64->dqb_curinodes); 1854 dqb32->dqb_btime = CLIP32(dqb64->dqb_btime); 1855 dqb32->dqb_itime = CLIP32(dqb64->dqb_itime); 1856 } 1857 1858 /* 1859 * Convert 32-bit host-order structure to 64-bit host-order structure. 1860 */ 1861 static void 1862 dqb32_dqb64(const struct dqblk32 *dqb32, struct dqblk64 *dqb64) 1863 { 1864 1865 dqb64->dqb_bhardlimit = dqb32->dqb_bhardlimit; 1866 dqb64->dqb_bsoftlimit = dqb32->dqb_bsoftlimit; 1867 dqb64->dqb_curblocks = dqb32->dqb_curblocks; 1868 dqb64->dqb_ihardlimit = dqb32->dqb_ihardlimit; 1869 dqb64->dqb_isoftlimit = dqb32->dqb_isoftlimit; 1870 dqb64->dqb_curinodes = dqb32->dqb_curinodes; 1871 dqb64->dqb_btime = dqb32->dqb_btime; 1872 dqb64->dqb_itime = dqb32->dqb_itime; 1873 } 1874