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sys/ufs/ufs/ufs_quota.c
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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 * @(#)ufs_quota.c 8.5 (Berkeley) 5/20/95 35 */ 36 37 #include <sys/cdefs.h> 38 __FBSDID("$FreeBSD$"); 39 40 #include "opt_ffs.h" 41 42 #include <sys/param.h> 43 #include <sys/systm.h> 44 #include <sys/endian.h> 45 #include <sys/fcntl.h> 46 #include <sys/kernel.h> 47 #include <sys/lock.h> 48 #include <sys/malloc.h> 49 #include <sys/mount.h> 50 #include <sys/mutex.h> 51 #include <sys/namei.h> 52 #include <sys/priv.h> 53 #include <sys/proc.h> 54 #include <sys/socket.h> 55 #include <sys/stat.h> 56 #include <sys/sysctl.h> 57 #include <sys/vnode.h> 58 59 #include <ufs/ufs/extattr.h> 60 #include <ufs/ufs/quota.h> 61 #include <ufs/ufs/inode.h> 62 #include <ufs/ufs/ufsmount.h> 63 #include <ufs/ufs/ufs_extern.h> 64 65 CTASSERT(sizeof(struct dqblk64) == sizeof(struct dqhdr64)); 66 67 static int unprivileged_get_quota = 0; 68 SYSCTL_INT(_security_bsd, OID_AUTO, unprivileged_get_quota, CTLFLAG_RW, 69 &unprivileged_get_quota, 0, 70 "Unprivileged processes may retrieve quotas for other uids and gids"); 71 72 static MALLOC_DEFINE(M_DQUOT, "ufs_quota", "UFS quota entries"); 73 74 /* 75 * Quota name to error message mapping. 76 */ 77 static char *quotatypes[] = INITQFNAMES; 78 79 static int chkdqchg(struct inode *, ufs2_daddr_t, struct ucred *, int, int *); 80 static int chkiqchg(struct inode *, int, struct ucred *, int, int *); 81 static int dqopen(struct vnode *, struct ufsmount *, int); 82 static int dqget(struct vnode *, 83 u_long, struct ufsmount *, int, struct dquot **); 84 static int dqsync(struct vnode *, struct dquot *); 85 static int dqflush(struct vnode *); 86 static int quotaoff1(struct thread *td, struct mount *mp, int type); 87 static int quotaoff_inchange(struct thread *td, struct mount *mp, int type); 88 89 /* conversion functions - from_to() */ 90 static void dqb32_dq(const struct dqblk32 *, struct dquot *); 91 static void dqb64_dq(const struct dqblk64 *, struct dquot *); 92 static void dq_dqb32(const struct dquot *, struct dqblk32 *); 93 static void dq_dqb64(const struct dquot *, struct dqblk64 *); 94 static void dqb32_dqb64(const struct dqblk32 *, struct dqblk64 *); 95 static void dqb64_dqb32(const struct dqblk64 *, struct dqblk32 *); 96 97 #ifdef DIAGNOSTIC 98 static void dqref(struct dquot *); 99 static void chkdquot(struct inode *); 100 #endif 101 102 /* 103 * Set up the quotas for an inode. 104 * 105 * This routine completely defines the semantics of quotas. 106 * If other criterion want to be used to establish quotas, the 107 * MAXQUOTAS value in quota.h should be increased, and the 108 * additional dquots set up here. 109 */ 110 int 111 getinoquota(struct inode *ip) 112 { 113 struct ufsmount *ump; 114 struct vnode *vp; 115 int error; 116 117 vp = ITOV(ip); 118 119 /* 120 * Disk quotas must be turned off for system files. Currently 121 * snapshot and quota files. 122 */ 123 if ((vp->v_vflag & VV_SYSTEM) != 0) 124 return (0); 125 /* 126 * XXX: Turn off quotas for files with a negative UID or GID. 127 * This prevents the creation of 100GB+ quota files. 128 */ 129 if ((int)ip->i_uid < 0 || (int)ip->i_gid < 0) 130 return (0); 131 ump = VFSTOUFS(vp->v_mount); 132 /* 133 * Set up the user quota based on file uid. 134 * EINVAL means that quotas are not enabled. 135 */ 136 if ((error = 137 dqget(vp, ip->i_uid, ump, USRQUOTA, &ip->i_dquot[USRQUOTA])) && 138 error != EINVAL) 139 return (error); 140 /* 141 * Set up the group quota based on file gid. 142 * EINVAL means that quotas are not enabled. 143 */ 144 if ((error = 145 dqget(vp, ip->i_gid, ump, GRPQUOTA, &ip->i_dquot[GRPQUOTA])) && 146 error != EINVAL) 147 return (error); 148 return (0); 149 } 150 151 /* 152 * Update disk usage, and take corrective action. 153 */ 154 int 155 chkdq(struct inode *ip, ufs2_daddr_t change, struct ucred *cred, int flags) 156 { 157 struct dquot *dq; 158 ufs2_daddr_t ncurblocks; 159 struct vnode *vp = ITOV(ip); 160 int i, error, warn, do_check; 161 162 MPASS(cred != NOCRED || (flags & FORCE) != 0); 163 /* 164 * Disk quotas must be turned off for system files. Currently 165 * snapshot and quota files. 166 */ 167 if ((vp->v_vflag & VV_SYSTEM) != 0) 168 return (0); 169 /* 170 * XXX: Turn off quotas for files with a negative UID or GID. 171 * This prevents the creation of 100GB+ quota files. 172 */ 173 if ((int)ip->i_uid < 0 || (int)ip->i_gid < 0) 174 return (0); 175 #ifdef DIAGNOSTIC 176 if ((flags & CHOWN) == 0) 177 chkdquot(ip); 178 #endif 179 if (change == 0) 180 return (0); 181 if (change < 0) { 182 for (i = 0; i < MAXQUOTAS; i++) { 183 if ((dq = ip->i_dquot[i]) == NODQUOT) 184 continue; 185 DQI_LOCK(dq); 186 DQI_WAIT(dq, PINOD+1, "chkdq1"); 187 ncurblocks = dq->dq_curblocks + change; 188 if (ncurblocks >= 0) 189 dq->dq_curblocks = ncurblocks; 190 else 191 dq->dq_curblocks = 0; 192 dq->dq_flags &= ~DQ_BLKS; 193 dq->dq_flags |= DQ_MOD; 194 DQI_UNLOCK(dq); 195 } 196 return (0); 197 } 198 if ((flags & FORCE) == 0 && 199 priv_check_cred(cred, PRIV_VFS_EXCEEDQUOTA)) 200 do_check = 1; 201 else 202 do_check = 0; 203 for (i = 0; i < MAXQUOTAS; i++) { 204 if ((dq = ip->i_dquot[i]) == NODQUOT) 205 continue; 206 warn = 0; 207 DQI_LOCK(dq); 208 DQI_WAIT(dq, PINOD+1, "chkdq2"); 209 if (do_check) { 210 error = chkdqchg(ip, change, cred, i, &warn); 211 if (error) { 212 /* 213 * Roll back user quota changes when 214 * group quota failed. 215 */ 216 while (i > 0) { 217 --i; 218 dq = ip->i_dquot[i]; 219 if (dq == NODQUOT) 220 continue; 221 DQI_LOCK(dq); 222 DQI_WAIT(dq, PINOD+1, "chkdq3"); 223 ncurblocks = dq->dq_curblocks - change; 224 if (ncurblocks >= 0) 225 dq->dq_curblocks = ncurblocks; 226 else 227 dq->dq_curblocks = 0; 228 dq->dq_flags &= ~DQ_BLKS; 229 dq->dq_flags |= DQ_MOD; 230 DQI_UNLOCK(dq); 231 } 232 return (error); 233 } 234 } 235 /* Reset timer when crossing soft limit */ 236 if (dq->dq_curblocks + change >= dq->dq_bsoftlimit && 237 dq->dq_curblocks < dq->dq_bsoftlimit) 238 dq->dq_btime = time_second + ITOUMP(ip)->um_btime[i]; 239 dq->dq_curblocks += change; 240 dq->dq_flags |= DQ_MOD; 241 DQI_UNLOCK(dq); 242 if (warn) 243 uprintf("\n%s: warning, %s disk quota exceeded\n", 244 ITOVFS(ip)->mnt_stat.f_mntonname, 245 quotatypes[i]); 246 } 247 return (0); 248 } 249 250 /* 251 * Check for a valid change to a users allocation. 252 * Issue an error message if appropriate. 253 */ 254 static int 255 chkdqchg(struct inode *ip, ufs2_daddr_t change, struct ucred *cred, 256 int type, int *warn) 257 { 258 struct dquot *dq = ip->i_dquot[type]; 259 ufs2_daddr_t ncurblocks = dq->dq_curblocks + change; 260 261 /* 262 * If user would exceed their hard limit, disallow space allocation. 263 */ 264 if (ncurblocks >= dq->dq_bhardlimit && dq->dq_bhardlimit) { 265 if ((dq->dq_flags & DQ_BLKS) == 0 && 266 ip->i_uid == cred->cr_uid) { 267 dq->dq_flags |= DQ_BLKS; 268 DQI_UNLOCK(dq); 269 uprintf("\n%s: write failed, %s disk limit reached\n", 270 ITOVFS(ip)->mnt_stat.f_mntonname, 271 quotatypes[type]); 272 return (EDQUOT); 273 } 274 DQI_UNLOCK(dq); 275 return (EDQUOT); 276 } 277 /* 278 * If user is over their soft limit for too long, disallow space 279 * allocation. Reset time limit as they cross their soft limit. 280 */ 281 if (ncurblocks >= dq->dq_bsoftlimit && dq->dq_bsoftlimit) { 282 if (dq->dq_curblocks < dq->dq_bsoftlimit) { 283 dq->dq_btime = time_second + ITOUMP(ip)->um_btime[type]; 284 if (ip->i_uid == cred->cr_uid) 285 *warn = 1; 286 return (0); 287 } 288 if (time_second > dq->dq_btime) { 289 if ((dq->dq_flags & DQ_BLKS) == 0 && 290 ip->i_uid == cred->cr_uid) { 291 dq->dq_flags |= DQ_BLKS; 292 DQI_UNLOCK(dq); 293 uprintf("\n%s: write failed, %s " 294 "disk quota exceeded for too long\n", 295 ITOVFS(ip)->mnt_stat.f_mntonname, 296 quotatypes[type]); 297 return (EDQUOT); 298 } 299 DQI_UNLOCK(dq); 300 return (EDQUOT); 301 } 302 } 303 return (0); 304 } 305 306 /* 307 * Check the inode limit, applying corrective action. 308 */ 309 int 310 chkiq(struct inode *ip, int change, struct ucred *cred, int flags) 311 { 312 struct dquot *dq; 313 int i, error, warn, do_check; 314 315 MPASS(cred != NOCRED || (flags & FORCE) != 0); 316 #ifdef DIAGNOSTIC 317 if ((flags & CHOWN) == 0) 318 chkdquot(ip); 319 #endif 320 if (change == 0) 321 return (0); 322 if (change < 0) { 323 for (i = 0; i < MAXQUOTAS; i++) { 324 if ((dq = ip->i_dquot[i]) == NODQUOT) 325 continue; 326 DQI_LOCK(dq); 327 DQI_WAIT(dq, PINOD+1, "chkiq1"); 328 if (dq->dq_curinodes >= -change) 329 dq->dq_curinodes += change; 330 else 331 dq->dq_curinodes = 0; 332 dq->dq_flags &= ~DQ_INODS; 333 dq->dq_flags |= DQ_MOD; 334 DQI_UNLOCK(dq); 335 } 336 return (0); 337 } 338 if ((flags & FORCE) == 0 && 339 priv_check_cred(cred, PRIV_VFS_EXCEEDQUOTA)) 340 do_check = 1; 341 else 342 do_check = 0; 343 for (i = 0; i < MAXQUOTAS; i++) { 344 if ((dq = ip->i_dquot[i]) == NODQUOT) 345 continue; 346 warn = 0; 347 DQI_LOCK(dq); 348 DQI_WAIT(dq, PINOD+1, "chkiq2"); 349 if (do_check) { 350 error = chkiqchg(ip, change, cred, i, &warn); 351 if (error) { 352 /* 353 * Roll back user quota changes when 354 * group quota failed. 355 */ 356 while (i > 0) { 357 --i; 358 dq = ip->i_dquot[i]; 359 if (dq == NODQUOT) 360 continue; 361 DQI_LOCK(dq); 362 DQI_WAIT(dq, PINOD+1, "chkiq3"); 363 if (dq->dq_curinodes >= change) 364 dq->dq_curinodes -= change; 365 else 366 dq->dq_curinodes = 0; 367 dq->dq_flags &= ~DQ_INODS; 368 dq->dq_flags |= DQ_MOD; 369 DQI_UNLOCK(dq); 370 } 371 return (error); 372 } 373 } 374 /* Reset timer when crossing soft limit */ 375 if (dq->dq_curinodes + change >= dq->dq_isoftlimit && 376 dq->dq_curinodes < dq->dq_isoftlimit) 377 dq->dq_itime = time_second + ITOUMP(ip)->um_itime[i]; 378 dq->dq_curinodes += change; 379 dq->dq_flags |= DQ_MOD; 380 DQI_UNLOCK(dq); 381 if (warn) 382 uprintf("\n%s: warning, %s inode quota exceeded\n", 383 ITOVFS(ip)->mnt_stat.f_mntonname, 384 quotatypes[i]); 385 } 386 return (0); 387 } 388 389 /* 390 * Check for a valid change to a users allocation. 391 * Issue an error message if appropriate. 392 */ 393 static int 394 chkiqchg(struct inode *ip, int change, struct ucred *cred, int type, int *warn) 395 { 396 struct dquot *dq = ip->i_dquot[type]; 397 ino_t ncurinodes = dq->dq_curinodes + change; 398 399 /* 400 * If user would exceed their hard limit, disallow inode allocation. 401 */ 402 if (ncurinodes >= dq->dq_ihardlimit && dq->dq_ihardlimit) { 403 if ((dq->dq_flags & DQ_INODS) == 0 && 404 ip->i_uid == cred->cr_uid) { 405 dq->dq_flags |= DQ_INODS; 406 DQI_UNLOCK(dq); 407 uprintf("\n%s: write failed, %s inode limit reached\n", 408 ITOVFS(ip)->mnt_stat.f_mntonname, 409 quotatypes[type]); 410 return (EDQUOT); 411 } 412 DQI_UNLOCK(dq); 413 return (EDQUOT); 414 } 415 /* 416 * If user is over their soft limit for too long, disallow inode 417 * allocation. Reset time limit as they cross their soft limit. 418 */ 419 if (ncurinodes >= dq->dq_isoftlimit && dq->dq_isoftlimit) { 420 if (dq->dq_curinodes < dq->dq_isoftlimit) { 421 dq->dq_itime = time_second + ITOUMP(ip)->um_itime[type]; 422 if (ip->i_uid == cred->cr_uid) 423 *warn = 1; 424 return (0); 425 } 426 if (time_second > dq->dq_itime) { 427 if ((dq->dq_flags & DQ_INODS) == 0 && 428 ip->i_uid == cred->cr_uid) { 429 dq->dq_flags |= DQ_INODS; 430 DQI_UNLOCK(dq); 431 uprintf("\n%s: write failed, %s " 432 "inode quota exceeded for too long\n", 433 ITOVFS(ip)->mnt_stat.f_mntonname, 434 quotatypes[type]); 435 return (EDQUOT); 436 } 437 DQI_UNLOCK(dq); 438 return (EDQUOT); 439 } 440 } 441 return (0); 442 } 443 444 #ifdef DIAGNOSTIC 445 /* 446 * On filesystems with quotas enabled, it is an error for a file to change 447 * size and not to have a dquot structure associated with it. 448 */ 449 static void 450 chkdquot(struct inode *ip) 451 { 452 struct ufsmount *ump; 453 struct vnode *vp; 454 int i; 455 456 ump = ITOUMP(ip); 457 vp = ITOV(ip); 458 459 /* 460 * Disk quotas must be turned off for system files. Currently 461 * these are snapshots and quota files. 462 */ 463 if ((vp->v_vflag & VV_SYSTEM) != 0) 464 return; 465 /* 466 * XXX: Turn off quotas for files with a negative UID or GID. 467 * This prevents the creation of 100GB+ quota files. 468 */ 469 if ((int)ip->i_uid < 0 || (int)ip->i_gid < 0) 470 return; 471 472 UFS_LOCK(ump); 473 for (i = 0; i < MAXQUOTAS; i++) { 474 if (ump->um_quotas[i] == NULLVP || 475 (ump->um_qflags[i] & (QTF_OPENING|QTF_CLOSING))) 476 continue; 477 if (ip->i_dquot[i] == NODQUOT) { 478 UFS_UNLOCK(ump); 479 vn_printf(ITOV(ip), "chkdquot: missing dquot "); 480 panic("chkdquot: missing dquot"); 481 } 482 } 483 UFS_UNLOCK(ump); 484 } 485 #endif 486 487 /* 488 * Code to process quotactl commands. 489 */ 490 491 /* 492 * Q_QUOTAON - set up a quota file for a particular filesystem. 493 */ 494 int 495 quotaon(struct thread *td, struct mount *mp, int type, void *fname, 496 bool *mp_busy) 497 { 498 struct ufsmount *ump; 499 struct vnode *vp, **vpp; 500 struct vnode *mvp; 501 struct dquot *dq; 502 int error, flags; 503 struct nameidata nd; 504 505 error = priv_check(td, PRIV_UFS_QUOTAON); 506 if (error != 0) 507 return (error); 508 509 if ((mp->mnt_flag & MNT_RDONLY) != 0) 510 return (EROFS); 511 512 ump = VFSTOUFS(mp); 513 dq = NODQUOT; 514 515 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, fname); 516 flags = FREAD | FWRITE; 517 vfs_ref(mp); 518 KASSERT(*mp_busy, ("%s called without busied mount", __func__)); 519 vfs_unbusy(mp); 520 *mp_busy = false; 521 error = vn_open(&nd, &flags, 0, NULL); 522 if (error != 0) { 523 vfs_rel(mp); 524 return (error); 525 } 526 NDFREE_PNBUF(&nd); 527 vp = nd.ni_vp; 528 error = vfs_busy(mp, MBF_NOWAIT); 529 vfs_rel(mp); 530 if (error == 0) { 531 *mp_busy = true; 532 if (vp->v_type != VREG) 533 error = EACCES; 534 } 535 if (error != 0) { 536 VOP_UNLOCK(vp); 537 (void) vn_close(vp, FREAD|FWRITE, td->td_ucred, td); 538 return (error); 539 } 540 541 UFS_LOCK(ump); 542 if ((ump->um_qflags[type] & (QTF_OPENING|QTF_CLOSING)) != 0) { 543 UFS_UNLOCK(ump); 544 VOP_UNLOCK(vp); 545 (void) vn_close(vp, FREAD|FWRITE, td->td_ucred, td); 546 return (EALREADY); 547 } 548 ump->um_qflags[type] |= QTF_OPENING|QTF_CLOSING; 549 UFS_UNLOCK(ump); 550 if ((error = dqopen(vp, ump, type)) != 0) { 551 VOP_UNLOCK(vp); 552 UFS_LOCK(ump); 553 ump->um_qflags[type] &= ~(QTF_OPENING|QTF_CLOSING); 554 UFS_UNLOCK(ump); 555 (void) vn_close(vp, FREAD|FWRITE, td->td_ucred, td); 556 return (error); 557 } 558 VOP_UNLOCK(vp); 559 MNT_ILOCK(mp); 560 mp->mnt_flag |= MNT_QUOTA; 561 mp->mnt_stat.f_flags |= MNT_QUOTA; 562 MNT_IUNLOCK(mp); 563 564 vpp = &ump->um_quotas[type]; 565 if (*vpp != vp) 566 quotaoff1(td, mp, type); 567 568 /* 569 * When the directory vnode containing the quota file is 570 * inactivated, due to the shared lookup of the quota file 571 * vput()ing the dvp, the qsyncvp() call for the containing 572 * directory would try to acquire the quota lock exclusive. 573 * At the same time, lookup already locked the quota vnode 574 * shared. Mark the quota vnode lock as allowing recursion 575 * and automatically converting shared locks to exclusive. 576 * 577 * Also mark quota vnode as system. 578 */ 579 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 580 vp->v_vflag |= VV_SYSTEM; 581 VN_LOCK_AREC(vp); 582 VN_LOCK_DSHARE(vp); 583 VOP_UNLOCK(vp); 584 *vpp = vp; 585 /* 586 * Save the credential of the process that turned on quotas. 587 * Set up the time limits for this quota. 588 */ 589 ump->um_cred[type] = crhold(td->td_ucred); 590 ump->um_btime[type] = MAX_DQ_TIME; 591 ump->um_itime[type] = MAX_IQ_TIME; 592 if (dqget(NULLVP, 0, ump, type, &dq) == 0) { 593 if (dq->dq_btime > 0) 594 ump->um_btime[type] = dq->dq_btime; 595 if (dq->dq_itime > 0) 596 ump->um_itime[type] = dq->dq_itime; 597 dqrele(NULLVP, dq); 598 } 599 /* 600 * Allow the getdq from getinoquota below to read the quota 601 * from file. 602 */ 603 UFS_LOCK(ump); 604 ump->um_qflags[type] &= ~QTF_CLOSING; 605 UFS_UNLOCK(ump); 606 /* 607 * Search vnodes associated with this mount point, 608 * adding references to quota file being opened. 609 * NB: only need to add dquot's for inodes being modified. 610 */ 611 again: 612 MNT_VNODE_FOREACH_ALL(vp, mp, mvp) { 613 if (vget(vp, LK_EXCLUSIVE | LK_INTERLOCK)) { 614 MNT_VNODE_FOREACH_ALL_ABORT(mp, mvp); 615 goto again; 616 } 617 if (vp->v_type == VNON || vp->v_writecount <= 0) { 618 vput(vp); 619 continue; 620 } 621 error = getinoquota(VTOI(vp)); 622 vput(vp); 623 if (error) { 624 MNT_VNODE_FOREACH_ALL_ABORT(mp, mvp); 625 break; 626 } 627 } 628 629 if (error) 630 quotaoff_inchange(td, mp, type); 631 UFS_LOCK(ump); 632 ump->um_qflags[type] &= ~QTF_OPENING; 633 KASSERT((ump->um_qflags[type] & QTF_CLOSING) == 0, 634 ("quotaon: leaking flags")); 635 UFS_UNLOCK(ump); 636 637 return (error); 638 } 639 640 /* 641 * Main code to turn off disk quotas for a filesystem. Does not change 642 * flags. 643 */ 644 static int 645 quotaoff1(struct thread *td, struct mount *mp, int type) 646 { 647 struct vnode *vp; 648 struct vnode *qvp, *mvp; 649 struct ufsmount *ump; 650 struct dquot *dq; 651 struct inode *ip; 652 struct ucred *cr; 653 int error; 654 655 ump = VFSTOUFS(mp); 656 657 UFS_LOCK(ump); 658 KASSERT((ump->um_qflags[type] & QTF_CLOSING) != 0, 659 ("quotaoff1: flags are invalid")); 660 if ((qvp = ump->um_quotas[type]) == NULLVP) { 661 UFS_UNLOCK(ump); 662 return (0); 663 } 664 cr = ump->um_cred[type]; 665 UFS_UNLOCK(ump); 666 667 /* 668 * Search vnodes associated with this mount point, 669 * deleting any references to quota file being closed. 670 */ 671 again: 672 MNT_VNODE_FOREACH_ALL(vp, mp, mvp) { 673 if (vp->v_type == VNON) { 674 VI_UNLOCK(vp); 675 continue; 676 } 677 if (vget(vp, LK_EXCLUSIVE | LK_INTERLOCK)) { 678 MNT_VNODE_FOREACH_ALL_ABORT(mp, mvp); 679 goto again; 680 } 681 ip = VTOI(vp); 682 dq = ip->i_dquot[type]; 683 ip->i_dquot[type] = NODQUOT; 684 dqrele(vp, dq); 685 vput(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); 704 error = vn_close(qvp, FREAD|FWRITE, td->td_ucred, td); 705 crfree(cr); 706 707 return (error); 708 } 709 710 static int 711 quotaoff_inchange1(struct thread *td, struct mount *mp, int type) 712 { 713 int error; 714 bool need_resume; 715 716 /* 717 * mp is already suspended on unmount. If not, suspend it, to 718 * avoid the situation where quotaoff operation eventually 719 * failing due to SU structures still keeping references on 720 * dquots, but vnode's references are already clean. This 721 * would cause quota accounting leak and asserts otherwise. 722 * Note that the thread has already called vn_start_write(). 723 */ 724 if (mp->mnt_susp_owner == td) { 725 need_resume = false; 726 } else { 727 error = vfs_write_suspend_umnt(mp); 728 if (error != 0) 729 return (error); 730 need_resume = true; 731 } 732 error = quotaoff1(td, mp, type); 733 if (need_resume) 734 vfs_write_resume(mp, VR_START_WRITE); 735 return (error); 736 } 737 738 /* 739 * Turns off quotas, assumes that ump->um_qflags are already checked 740 * and QTF_CLOSING is set to indicate operation in progress. Fixes 741 * ump->um_qflags and mp->mnt_flag after. 742 */ 743 int 744 quotaoff_inchange(struct thread *td, struct mount *mp, int type) 745 { 746 struct ufsmount *ump; 747 int error, i; 748 749 error = quotaoff_inchange1(td, mp, type); 750 751 ump = VFSTOUFS(mp); 752 UFS_LOCK(ump); 753 ump->um_qflags[type] &= ~QTF_CLOSING; 754 for (i = 0; i < MAXQUOTAS; i++) 755 if (ump->um_quotas[i] != NULLVP) 756 break; 757 if (i == MAXQUOTAS) { 758 MNT_ILOCK(mp); 759 mp->mnt_flag &= ~MNT_QUOTA; 760 mp->mnt_stat.f_flags &= ~MNT_QUOTA; 761 MNT_IUNLOCK(mp); 762 } 763 UFS_UNLOCK(ump); 764 return (error); 765 } 766 767 /* 768 * Q_QUOTAOFF - turn off disk quotas for a filesystem. 769 */ 770 int 771 quotaoff(struct thread *td, struct mount *mp, int type) 772 { 773 struct ufsmount *ump; 774 int error; 775 776 error = priv_check(td, PRIV_UFS_QUOTAOFF); 777 if (error) 778 return (error); 779 780 ump = VFSTOUFS(mp); 781 UFS_LOCK(ump); 782 if ((ump->um_qflags[type] & (QTF_OPENING|QTF_CLOSING)) != 0) { 783 UFS_UNLOCK(ump); 784 return (EALREADY); 785 } 786 ump->um_qflags[type] |= QTF_CLOSING; 787 UFS_UNLOCK(ump); 788 789 return (quotaoff_inchange(td, mp, type)); 790 } 791 792 /* 793 * Q_GETQUOTA - return current values in a dqblk structure. 794 */ 795 static int 796 _getquota(struct thread *td, struct mount *mp, u_long id, int type, 797 struct dqblk64 *dqb) 798 { 799 struct dquot *dq; 800 int error; 801 802 switch (type) { 803 case USRQUOTA: 804 if ((td->td_ucred->cr_uid != id) && !unprivileged_get_quota) { 805 error = priv_check(td, PRIV_VFS_GETQUOTA); 806 if (error) 807 return (error); 808 } 809 break; 810 811 case GRPQUOTA: 812 if (!groupmember(id, td->td_ucred) && 813 !unprivileged_get_quota) { 814 error = priv_check(td, PRIV_VFS_GETQUOTA); 815 if (error) 816 return (error); 817 } 818 break; 819 820 default: 821 return (EINVAL); 822 } 823 824 dq = NODQUOT; 825 error = dqget(NULLVP, id, VFSTOUFS(mp), type, &dq); 826 if (error) 827 return (error); 828 *dqb = dq->dq_dqb; 829 dqrele(NULLVP, dq); 830 return (error); 831 } 832 833 /* 834 * Q_SETQUOTA - assign an entire dqblk structure. 835 */ 836 static int 837 _setquota(struct thread *td, struct mount *mp, u_long id, int type, 838 struct dqblk64 *dqb) 839 { 840 struct dquot *dq; 841 struct dquot *ndq; 842 struct ufsmount *ump; 843 struct dqblk64 newlim; 844 int error; 845 846 error = priv_check(td, PRIV_VFS_SETQUOTA); 847 if (error) 848 return (error); 849 850 newlim = *dqb; 851 852 ndq = NODQUOT; 853 ump = VFSTOUFS(mp); 854 855 error = dqget(NULLVP, id, ump, type, &ndq); 856 if (error) 857 return (error); 858 dq = ndq; 859 DQI_LOCK(dq); 860 DQI_WAIT(dq, PINOD+1, "setqta"); 861 /* 862 * Copy all but the current values. 863 * Reset time limit if previously had no soft limit or were 864 * under it, but now have a soft limit and are over it. 865 */ 866 newlim.dqb_curblocks = dq->dq_curblocks; 867 newlim.dqb_curinodes = dq->dq_curinodes; 868 if (dq->dq_id != 0) { 869 newlim.dqb_btime = dq->dq_btime; 870 newlim.dqb_itime = dq->dq_itime; 871 } 872 if (newlim.dqb_bsoftlimit && 873 dq->dq_curblocks >= newlim.dqb_bsoftlimit && 874 (dq->dq_bsoftlimit == 0 || dq->dq_curblocks < dq->dq_bsoftlimit)) 875 newlim.dqb_btime = time_second + ump->um_btime[type]; 876 if (newlim.dqb_isoftlimit && 877 dq->dq_curinodes >= newlim.dqb_isoftlimit && 878 (dq->dq_isoftlimit == 0 || dq->dq_curinodes < dq->dq_isoftlimit)) 879 newlim.dqb_itime = time_second + ump->um_itime[type]; 880 dq->dq_dqb = newlim; 881 if (dq->dq_curblocks < dq->dq_bsoftlimit) 882 dq->dq_flags &= ~DQ_BLKS; 883 if (dq->dq_curinodes < dq->dq_isoftlimit) 884 dq->dq_flags &= ~DQ_INODS; 885 if (dq->dq_isoftlimit == 0 && dq->dq_bsoftlimit == 0 && 886 dq->dq_ihardlimit == 0 && dq->dq_bhardlimit == 0) 887 dq->dq_flags |= DQ_FAKE; 888 else 889 dq->dq_flags &= ~DQ_FAKE; 890 dq->dq_flags |= DQ_MOD; 891 DQI_UNLOCK(dq); 892 dqrele(NULLVP, dq); 893 return (0); 894 } 895 896 /* 897 * Q_SETUSE - set current inode and block usage. 898 */ 899 static int 900 _setuse(struct thread *td, struct mount *mp, u_long id, int type, 901 struct dqblk64 *dqb) 902 { 903 struct dquot *dq; 904 struct ufsmount *ump; 905 struct dquot *ndq; 906 struct dqblk64 usage; 907 int error; 908 909 error = priv_check(td, PRIV_UFS_SETUSE); 910 if (error) 911 return (error); 912 913 usage = *dqb; 914 915 ump = VFSTOUFS(mp); 916 ndq = NODQUOT; 917 918 error = dqget(NULLVP, id, ump, type, &ndq); 919 if (error) 920 return (error); 921 dq = ndq; 922 DQI_LOCK(dq); 923 DQI_WAIT(dq, PINOD+1, "setuse"); 924 /* 925 * Reset time limit if have a soft limit and were 926 * previously under it, but are now over it. 927 */ 928 if (dq->dq_bsoftlimit && dq->dq_curblocks < dq->dq_bsoftlimit && 929 usage.dqb_curblocks >= dq->dq_bsoftlimit) 930 dq->dq_btime = time_second + ump->um_btime[type]; 931 if (dq->dq_isoftlimit && dq->dq_curinodes < dq->dq_isoftlimit && 932 usage.dqb_curinodes >= dq->dq_isoftlimit) 933 dq->dq_itime = time_second + ump->um_itime[type]; 934 dq->dq_curblocks = usage.dqb_curblocks; 935 dq->dq_curinodes = usage.dqb_curinodes; 936 if (dq->dq_curblocks < dq->dq_bsoftlimit) 937 dq->dq_flags &= ~DQ_BLKS; 938 if (dq->dq_curinodes < dq->dq_isoftlimit) 939 dq->dq_flags &= ~DQ_INODS; 940 dq->dq_flags |= DQ_MOD; 941 DQI_UNLOCK(dq); 942 dqrele(NULLVP, dq); 943 return (0); 944 } 945 946 int 947 getquota32(struct thread *td, struct mount *mp, u_long id, int type, void *addr) 948 { 949 struct dqblk32 dqb32; 950 struct dqblk64 dqb64; 951 int error; 952 953 error = _getquota(td, mp, id, type, &dqb64); 954 if (error) 955 return (error); 956 dqb64_dqb32(&dqb64, &dqb32); 957 error = copyout(&dqb32, addr, sizeof(dqb32)); 958 return (error); 959 } 960 961 int 962 setquota32(struct thread *td, struct mount *mp, u_long id, int type, 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, u_long 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, u_long 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, u_long 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, u_long 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, u_long 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, u_long 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, u_long 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, u_long 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 }
Cache object: e4804b524d005742aa4f6f0293a3883a
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