zfs_vfsops.c revision 232728
1/* 2 * CDDL HEADER START 3 * 4 * The contents of this file are subject to the terms of the 5 * Common Development and Distribution License (the "License"). 6 * You may not use this file except in compliance with the License. 7 * 8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 9 * or http://www.opensolaris.org/os/licensing. 10 * See the License for the specific language governing permissions 11 * and limitations under the License. 12 * 13 * When distributing Covered Code, include this CDDL HEADER in each 14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 15 * If applicable, add the following below this CDDL HEADER, with the 16 * fields enclosed by brackets "[]" replaced with your own identifying 17 * information: Portions Copyright [yyyy] [name of copyright owner] 18 * 19 * CDDL HEADER END 20 */ 21/* 22 * Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved. 23 * Copyright (c) 2011 Pawel Jakub Dawidek <pawel@dawidek.net>. 24 * All rights reserved. 25 */ 26 27/* Portions Copyright 2010 Robert Milkowski */ 28 29#include <sys/types.h> 30#include <sys/param.h> 31#include <sys/systm.h> 32#include <sys/kernel.h> 33#include <sys/sysmacros.h> 34#include <sys/kmem.h> 35#include <sys/acl.h> 36#include <sys/vnode.h> 37#include <sys/vfs.h> 38#include <sys/mntent.h> 39#include <sys/mount.h> 40#include <sys/cmn_err.h> 41#include <sys/zfs_znode.h> 42#include <sys/zfs_dir.h> 43#include <sys/zil.h> 44#include <sys/fs/zfs.h> 45#include <sys/dmu.h> 46#include <sys/dsl_prop.h> 47#include <sys/dsl_dataset.h> 48#include <sys/dsl_deleg.h> 49#include <sys/spa.h> 50#include <sys/zap.h> 51#include <sys/sa.h> 52#include <sys/varargs.h> 53#include <sys/policy.h> 54#include <sys/atomic.h> 55#include <sys/zfs_ioctl.h> 56#include <sys/zfs_ctldir.h> 57#include <sys/zfs_fuid.h> 58#include <sys/sunddi.h> 59#include <sys/dnlc.h> 60#include <sys/dmu_objset.h> 61#include <sys/spa_boot.h> 62#include <sys/sa.h> 63#include <sys/jail.h> 64#include "zfs_comutil.h" 65 66struct mtx zfs_debug_mtx; 67MTX_SYSINIT(zfs_debug_mtx, &zfs_debug_mtx, "zfs_debug", MTX_DEF); 68 69SYSCTL_NODE(_vfs, OID_AUTO, zfs, CTLFLAG_RW, 0, "ZFS file system"); 70 71int zfs_super_owner; 72SYSCTL_INT(_vfs_zfs, OID_AUTO, super_owner, CTLFLAG_RW, &zfs_super_owner, 0, 73 "File system owner can perform privileged operation on his file systems"); 74 75int zfs_debug_level; 76TUNABLE_INT("vfs.zfs.debug", &zfs_debug_level); 77SYSCTL_INT(_vfs_zfs, OID_AUTO, debug, CTLFLAG_RW, &zfs_debug_level, 0, 78 "Debug level"); 79 80SYSCTL_NODE(_vfs_zfs, OID_AUTO, version, CTLFLAG_RD, 0, "ZFS versions"); 81static int zfs_version_acl = ZFS_ACL_VERSION; 82SYSCTL_INT(_vfs_zfs_version, OID_AUTO, acl, CTLFLAG_RD, &zfs_version_acl, 0, 83 "ZFS_ACL_VERSION"); 84static int zfs_version_spa = SPA_VERSION; 85SYSCTL_INT(_vfs_zfs_version, OID_AUTO, spa, CTLFLAG_RD, &zfs_version_spa, 0, 86 "SPA_VERSION"); 87static int zfs_version_zpl = ZPL_VERSION; 88SYSCTL_INT(_vfs_zfs_version, OID_AUTO, zpl, CTLFLAG_RD, &zfs_version_zpl, 0, 89 "ZPL_VERSION"); 90 91static int zfs_mount(vfs_t *vfsp); 92static int zfs_umount(vfs_t *vfsp, int fflag); 93static int zfs_root(vfs_t *vfsp, int flags, vnode_t **vpp); 94static int zfs_statfs(vfs_t *vfsp, struct statfs *statp); 95static int zfs_vget(vfs_t *vfsp, ino_t ino, int flags, vnode_t **vpp); 96static int zfs_sync(vfs_t *vfsp, int waitfor); 97static int zfs_checkexp(vfs_t *vfsp, struct sockaddr *nam, int *extflagsp, 98 struct ucred **credanonp, int *numsecflavors, int **secflavors); 99static int zfs_fhtovp(vfs_t *vfsp, fid_t *fidp, int flags, vnode_t **vpp); 100static void zfs_objset_close(zfsvfs_t *zfsvfs); 101static void zfs_freevfs(vfs_t *vfsp); 102 103static struct vfsops zfs_vfsops = { 104 .vfs_mount = zfs_mount, 105 .vfs_unmount = zfs_umount, 106 .vfs_root = zfs_root, 107 .vfs_statfs = zfs_statfs, 108 .vfs_vget = zfs_vget, 109 .vfs_sync = zfs_sync, 110 .vfs_checkexp = zfs_checkexp, 111 .vfs_fhtovp = zfs_fhtovp, 112}; 113 114VFS_SET(zfs_vfsops, zfs, VFCF_JAIL | VFCF_DELEGADMIN); 115 116/* 117 * We need to keep a count of active fs's. 118 * This is necessary to prevent our module 119 * from being unloaded after a umount -f 120 */ 121static uint32_t zfs_active_fs_count = 0; 122 123/*ARGSUSED*/ 124static int 125zfs_sync(vfs_t *vfsp, int waitfor) 126{ 127 128 /* 129 * Data integrity is job one. We don't want a compromised kernel 130 * writing to the storage pool, so we never sync during panic. 131 */ 132 if (panicstr) 133 return (0); 134 135 if (vfsp != NULL) { 136 /* 137 * Sync a specific filesystem. 138 */ 139 zfsvfs_t *zfsvfs = vfsp->vfs_data; 140 dsl_pool_t *dp; 141 int error; 142 143 error = vfs_stdsync(vfsp, waitfor); 144 if (error != 0) 145 return (error); 146 147 ZFS_ENTER(zfsvfs); 148 dp = dmu_objset_pool(zfsvfs->z_os); 149 150 /* 151 * If the system is shutting down, then skip any 152 * filesystems which may exist on a suspended pool. 153 */ 154 if (sys_shutdown && spa_suspended(dp->dp_spa)) { 155 ZFS_EXIT(zfsvfs); 156 return (0); 157 } 158 159 if (zfsvfs->z_log != NULL) 160 zil_commit(zfsvfs->z_log, 0); 161 162 ZFS_EXIT(zfsvfs); 163 } else { 164 /* 165 * Sync all ZFS filesystems. This is what happens when you 166 * run sync(1M). Unlike other filesystems, ZFS honors the 167 * request by waiting for all pools to commit all dirty data. 168 */ 169 spa_sync_allpools(); 170 } 171 172 return (0); 173} 174 175#ifndef __FreeBSD__ 176static int 177zfs_create_unique_device(dev_t *dev) 178{ 179 major_t new_major; 180 181 do { 182 ASSERT3U(zfs_minor, <=, MAXMIN32); 183 minor_t start = zfs_minor; 184 do { 185 mutex_enter(&zfs_dev_mtx); 186 if (zfs_minor >= MAXMIN32) { 187 /* 188 * If we're still using the real major 189 * keep out of /dev/zfs and /dev/zvol minor 190 * number space. If we're using a getudev()'ed 191 * major number, we can use all of its minors. 192 */ 193 if (zfs_major == ddi_name_to_major(ZFS_DRIVER)) 194 zfs_minor = ZFS_MIN_MINOR; 195 else 196 zfs_minor = 0; 197 } else { 198 zfs_minor++; 199 } 200 *dev = makedevice(zfs_major, zfs_minor); 201 mutex_exit(&zfs_dev_mtx); 202 } while (vfs_devismounted(*dev) && zfs_minor != start); 203 if (zfs_minor == start) { 204 /* 205 * We are using all ~262,000 minor numbers for the 206 * current major number. Create a new major number. 207 */ 208 if ((new_major = getudev()) == (major_t)-1) { 209 cmn_err(CE_WARN, 210 "zfs_mount: Can't get unique major " 211 "device number."); 212 return (-1); 213 } 214 mutex_enter(&zfs_dev_mtx); 215 zfs_major = new_major; 216 zfs_minor = 0; 217 218 mutex_exit(&zfs_dev_mtx); 219 } else { 220 break; 221 } 222 /* CONSTANTCONDITION */ 223 } while (1); 224 225 return (0); 226} 227#endif /* !__FreeBSD__ */ 228 229static void 230atime_changed_cb(void *arg, uint64_t newval) 231{ 232 zfsvfs_t *zfsvfs = arg; 233 234 if (newval == TRUE) { 235 zfsvfs->z_atime = TRUE; 236 zfsvfs->z_vfs->vfs_flag &= ~MNT_NOATIME; 237 vfs_clearmntopt(zfsvfs->z_vfs, MNTOPT_NOATIME); 238 vfs_setmntopt(zfsvfs->z_vfs, MNTOPT_ATIME, NULL, 0); 239 } else { 240 zfsvfs->z_atime = FALSE; 241 zfsvfs->z_vfs->vfs_flag |= MNT_NOATIME; 242 vfs_clearmntopt(zfsvfs->z_vfs, MNTOPT_ATIME); 243 vfs_setmntopt(zfsvfs->z_vfs, MNTOPT_NOATIME, NULL, 0); 244 } 245} 246 247static void 248xattr_changed_cb(void *arg, uint64_t newval) 249{ 250 zfsvfs_t *zfsvfs = arg; 251 252 if (newval == TRUE) { 253 /* XXX locking on vfs_flag? */ 254#ifdef TODO 255 zfsvfs->z_vfs->vfs_flag |= VFS_XATTR; 256#endif 257 vfs_clearmntopt(zfsvfs->z_vfs, MNTOPT_NOXATTR); 258 vfs_setmntopt(zfsvfs->z_vfs, MNTOPT_XATTR, NULL, 0); 259 } else { 260 /* XXX locking on vfs_flag? */ 261#ifdef TODO 262 zfsvfs->z_vfs->vfs_flag &= ~VFS_XATTR; 263#endif 264 vfs_clearmntopt(zfsvfs->z_vfs, MNTOPT_XATTR); 265 vfs_setmntopt(zfsvfs->z_vfs, MNTOPT_NOXATTR, NULL, 0); 266 } 267} 268 269static void 270blksz_changed_cb(void *arg, uint64_t newval) 271{ 272 zfsvfs_t *zfsvfs = arg; 273 274 if (newval < SPA_MINBLOCKSIZE || 275 newval > SPA_MAXBLOCKSIZE || !ISP2(newval)) 276 newval = SPA_MAXBLOCKSIZE; 277 278 zfsvfs->z_max_blksz = newval; 279 zfsvfs->z_vfs->mnt_stat.f_iosize = newval; 280} 281 282static void 283readonly_changed_cb(void *arg, uint64_t newval) 284{ 285 zfsvfs_t *zfsvfs = arg; 286 287 if (newval) { 288 /* XXX locking on vfs_flag? */ 289 zfsvfs->z_vfs->vfs_flag |= VFS_RDONLY; 290 vfs_clearmntopt(zfsvfs->z_vfs, MNTOPT_RW); 291 vfs_setmntopt(zfsvfs->z_vfs, MNTOPT_RO, NULL, 0); 292 } else { 293 /* XXX locking on vfs_flag? */ 294 zfsvfs->z_vfs->vfs_flag &= ~VFS_RDONLY; 295 vfs_clearmntopt(zfsvfs->z_vfs, MNTOPT_RO); 296 vfs_setmntopt(zfsvfs->z_vfs, MNTOPT_RW, NULL, 0); 297 } 298} 299 300static void 301setuid_changed_cb(void *arg, uint64_t newval) 302{ 303 zfsvfs_t *zfsvfs = arg; 304 305 if (newval == FALSE) { 306 zfsvfs->z_vfs->vfs_flag |= VFS_NOSETUID; 307 vfs_clearmntopt(zfsvfs->z_vfs, MNTOPT_SETUID); 308 vfs_setmntopt(zfsvfs->z_vfs, MNTOPT_NOSETUID, NULL, 0); 309 } else { 310 zfsvfs->z_vfs->vfs_flag &= ~VFS_NOSETUID; 311 vfs_clearmntopt(zfsvfs->z_vfs, MNTOPT_NOSETUID); 312 vfs_setmntopt(zfsvfs->z_vfs, MNTOPT_SETUID, NULL, 0); 313 } 314} 315 316static void 317exec_changed_cb(void *arg, uint64_t newval) 318{ 319 zfsvfs_t *zfsvfs = arg; 320 321 if (newval == FALSE) { 322 zfsvfs->z_vfs->vfs_flag |= VFS_NOEXEC; 323 vfs_clearmntopt(zfsvfs->z_vfs, MNTOPT_EXEC); 324 vfs_setmntopt(zfsvfs->z_vfs, MNTOPT_NOEXEC, NULL, 0); 325 } else { 326 zfsvfs->z_vfs->vfs_flag &= ~VFS_NOEXEC; 327 vfs_clearmntopt(zfsvfs->z_vfs, MNTOPT_NOEXEC); 328 vfs_setmntopt(zfsvfs->z_vfs, MNTOPT_EXEC, NULL, 0); 329 } 330} 331 332/* 333 * The nbmand mount option can be changed at mount time. 334 * We can't allow it to be toggled on live file systems or incorrect 335 * behavior may be seen from cifs clients 336 * 337 * This property isn't registered via dsl_prop_register(), but this callback 338 * will be called when a file system is first mounted 339 */ 340static void 341nbmand_changed_cb(void *arg, uint64_t newval) 342{ 343 zfsvfs_t *zfsvfs = arg; 344 if (newval == FALSE) { 345 vfs_clearmntopt(zfsvfs->z_vfs, MNTOPT_NBMAND); 346 vfs_setmntopt(zfsvfs->z_vfs, MNTOPT_NONBMAND, NULL, 0); 347 } else { 348 vfs_clearmntopt(zfsvfs->z_vfs, MNTOPT_NONBMAND); 349 vfs_setmntopt(zfsvfs->z_vfs, MNTOPT_NBMAND, NULL, 0); 350 } 351} 352 353static void 354snapdir_changed_cb(void *arg, uint64_t newval) 355{ 356 zfsvfs_t *zfsvfs = arg; 357 358 zfsvfs->z_show_ctldir = newval; 359} 360 361static void 362vscan_changed_cb(void *arg, uint64_t newval) 363{ 364 zfsvfs_t *zfsvfs = arg; 365 366 zfsvfs->z_vscan = newval; 367} 368 369static void 370acl_mode_changed_cb(void *arg, uint64_t newval) 371{ 372 zfsvfs_t *zfsvfs = arg; 373 374 zfsvfs->z_acl_mode = newval; 375} 376 377static void 378acl_inherit_changed_cb(void *arg, uint64_t newval) 379{ 380 zfsvfs_t *zfsvfs = arg; 381 382 zfsvfs->z_acl_inherit = newval; 383} 384 385static int 386zfs_register_callbacks(vfs_t *vfsp) 387{ 388 struct dsl_dataset *ds = NULL; 389 objset_t *os = NULL; 390 zfsvfs_t *zfsvfs = NULL; 391 uint64_t nbmand; 392 int readonly, do_readonly = B_FALSE; 393 int setuid, do_setuid = B_FALSE; 394 int exec, do_exec = B_FALSE; 395 int xattr, do_xattr = B_FALSE; 396 int atime, do_atime = B_FALSE; 397 int error = 0; 398 399 ASSERT(vfsp); 400 zfsvfs = vfsp->vfs_data; 401 ASSERT(zfsvfs); 402 os = zfsvfs->z_os; 403 404 /* 405 * This function can be called for a snapshot when we update snapshot's 406 * mount point, which isn't really supported. 407 */ 408 if (dmu_objset_is_snapshot(os)) 409 return (EOPNOTSUPP); 410 411 /* 412 * The act of registering our callbacks will destroy any mount 413 * options we may have. In order to enable temporary overrides 414 * of mount options, we stash away the current values and 415 * restore them after we register the callbacks. 416 */ 417 if (vfs_optionisset(vfsp, MNTOPT_RO, NULL) || 418 !spa_writeable(dmu_objset_spa(os))) { 419 readonly = B_TRUE; 420 do_readonly = B_TRUE; 421 } else if (vfs_optionisset(vfsp, MNTOPT_RW, NULL)) { 422 readonly = B_FALSE; 423 do_readonly = B_TRUE; 424 } 425 if (vfs_optionisset(vfsp, MNTOPT_NOSUID, NULL)) { 426 setuid = B_FALSE; 427 do_setuid = B_TRUE; 428 } else { 429 if (vfs_optionisset(vfsp, MNTOPT_NOSETUID, NULL)) { 430 setuid = B_FALSE; 431 do_setuid = B_TRUE; 432 } else if (vfs_optionisset(vfsp, MNTOPT_SETUID, NULL)) { 433 setuid = B_TRUE; 434 do_setuid = B_TRUE; 435 } 436 } 437 if (vfs_optionisset(vfsp, MNTOPT_NOEXEC, NULL)) { 438 exec = B_FALSE; 439 do_exec = B_TRUE; 440 } else if (vfs_optionisset(vfsp, MNTOPT_EXEC, NULL)) { 441 exec = B_TRUE; 442 do_exec = B_TRUE; 443 } 444 if (vfs_optionisset(vfsp, MNTOPT_NOXATTR, NULL)) { 445 xattr = B_FALSE; 446 do_xattr = B_TRUE; 447 } else if (vfs_optionisset(vfsp, MNTOPT_XATTR, NULL)) { 448 xattr = B_TRUE; 449 do_xattr = B_TRUE; 450 } 451 if (vfs_optionisset(vfsp, MNTOPT_NOATIME, NULL)) { 452 atime = B_FALSE; 453 do_atime = B_TRUE; 454 } else if (vfs_optionisset(vfsp, MNTOPT_ATIME, NULL)) { 455 atime = B_TRUE; 456 do_atime = B_TRUE; 457 } 458 459 /* 460 * nbmand is a special property. It can only be changed at 461 * mount time. 462 * 463 * This is weird, but it is documented to only be changeable 464 * at mount time. 465 */ 466 if (vfs_optionisset(vfsp, MNTOPT_NONBMAND, NULL)) { 467 nbmand = B_FALSE; 468 } else if (vfs_optionisset(vfsp, MNTOPT_NBMAND, NULL)) { 469 nbmand = B_TRUE; 470 } else { 471 char osname[MAXNAMELEN]; 472 473 dmu_objset_name(os, osname); 474 if (error = dsl_prop_get_integer(osname, "nbmand", &nbmand, 475 NULL)) { 476 return (error); 477 } 478 } 479 480 /* 481 * Register property callbacks. 482 * 483 * It would probably be fine to just check for i/o error from 484 * the first prop_register(), but I guess I like to go 485 * overboard... 486 */ 487 ds = dmu_objset_ds(os); 488 error = dsl_prop_register(ds, "atime", atime_changed_cb, zfsvfs); 489 error = error ? error : dsl_prop_register(ds, 490 "xattr", xattr_changed_cb, zfsvfs); 491 error = error ? error : dsl_prop_register(ds, 492 "recordsize", blksz_changed_cb, zfsvfs); 493 error = error ? error : dsl_prop_register(ds, 494 "readonly", readonly_changed_cb, zfsvfs); 495 error = error ? error : dsl_prop_register(ds, 496 "setuid", setuid_changed_cb, zfsvfs); 497 error = error ? error : dsl_prop_register(ds, 498 "exec", exec_changed_cb, zfsvfs); 499 error = error ? error : dsl_prop_register(ds, 500 "snapdir", snapdir_changed_cb, zfsvfs); 501 error = error ? error : dsl_prop_register(ds, 502 "aclmode", acl_mode_changed_cb, zfsvfs); 503 error = error ? error : dsl_prop_register(ds, 504 "aclinherit", acl_inherit_changed_cb, zfsvfs); 505 error = error ? error : dsl_prop_register(ds, 506 "vscan", vscan_changed_cb, zfsvfs); 507 if (error) 508 goto unregister; 509 510 /* 511 * Invoke our callbacks to restore temporary mount options. 512 */ 513 if (do_readonly) 514 readonly_changed_cb(zfsvfs, readonly); 515 if (do_setuid) 516 setuid_changed_cb(zfsvfs, setuid); 517 if (do_exec) 518 exec_changed_cb(zfsvfs, exec); 519 if (do_xattr) 520 xattr_changed_cb(zfsvfs, xattr); 521 if (do_atime) 522 atime_changed_cb(zfsvfs, atime); 523 524 nbmand_changed_cb(zfsvfs, nbmand); 525 526 return (0); 527 528unregister: 529 /* 530 * We may attempt to unregister some callbacks that are not 531 * registered, but this is OK; it will simply return ENOMSG, 532 * which we will ignore. 533 */ 534 (void) dsl_prop_unregister(ds, "atime", atime_changed_cb, zfsvfs); 535 (void) dsl_prop_unregister(ds, "xattr", xattr_changed_cb, zfsvfs); 536 (void) dsl_prop_unregister(ds, "recordsize", blksz_changed_cb, zfsvfs); 537 (void) dsl_prop_unregister(ds, "readonly", readonly_changed_cb, zfsvfs); 538 (void) dsl_prop_unregister(ds, "setuid", setuid_changed_cb, zfsvfs); 539 (void) dsl_prop_unregister(ds, "exec", exec_changed_cb, zfsvfs); 540 (void) dsl_prop_unregister(ds, "snapdir", snapdir_changed_cb, zfsvfs); 541 (void) dsl_prop_unregister(ds, "aclmode", acl_mode_changed_cb, zfsvfs); 542 (void) dsl_prop_unregister(ds, "aclinherit", acl_inherit_changed_cb, 543 zfsvfs); 544 (void) dsl_prop_unregister(ds, "vscan", vscan_changed_cb, zfsvfs); 545 return (error); 546 547} 548 549static int 550zfs_space_delta_cb(dmu_object_type_t bonustype, void *data, 551 uint64_t *userp, uint64_t *groupp) 552{ 553 znode_phys_t *znp = data; 554 int error = 0; 555 556 /* 557 * Is it a valid type of object to track? 558 */ 559 if (bonustype != DMU_OT_ZNODE && bonustype != DMU_OT_SA) 560 return (ENOENT); 561 562 /* 563 * If we have a NULL data pointer 564 * then assume the id's aren't changing and 565 * return EEXIST to the dmu to let it know to 566 * use the same ids 567 */ 568 if (data == NULL) 569 return (EEXIST); 570 571 if (bonustype == DMU_OT_ZNODE) { 572 *userp = znp->zp_uid; 573 *groupp = znp->zp_gid; 574 } else { 575 int hdrsize; 576 577 ASSERT(bonustype == DMU_OT_SA); 578 hdrsize = sa_hdrsize(data); 579 580 if (hdrsize != 0) { 581 *userp = *((uint64_t *)((uintptr_t)data + hdrsize + 582 SA_UID_OFFSET)); 583 *groupp = *((uint64_t *)((uintptr_t)data + hdrsize + 584 SA_GID_OFFSET)); 585 } else { 586 /* 587 * This should only happen for newly created 588 * files that haven't had the znode data filled 589 * in yet. 590 */ 591 *userp = 0; 592 *groupp = 0; 593 } 594 } 595 return (error); 596} 597 598static void 599fuidstr_to_sid(zfsvfs_t *zfsvfs, const char *fuidstr, 600 char *domainbuf, int buflen, uid_t *ridp) 601{ 602 uint64_t fuid; 603 const char *domain; 604 605 fuid = strtonum(fuidstr, NULL); 606 607 domain = zfs_fuid_find_by_idx(zfsvfs, FUID_INDEX(fuid)); 608 if (domain) 609 (void) strlcpy(domainbuf, domain, buflen); 610 else 611 domainbuf[0] = '\0'; 612 *ridp = FUID_RID(fuid); 613} 614 615static uint64_t 616zfs_userquota_prop_to_obj(zfsvfs_t *zfsvfs, zfs_userquota_prop_t type) 617{ 618 switch (type) { 619 case ZFS_PROP_USERUSED: 620 return (DMU_USERUSED_OBJECT); 621 case ZFS_PROP_GROUPUSED: 622 return (DMU_GROUPUSED_OBJECT); 623 case ZFS_PROP_USERQUOTA: 624 return (zfsvfs->z_userquota_obj); 625 case ZFS_PROP_GROUPQUOTA: 626 return (zfsvfs->z_groupquota_obj); 627 } 628 return (0); 629} 630 631int 632zfs_userspace_many(zfsvfs_t *zfsvfs, zfs_userquota_prop_t type, 633 uint64_t *cookiep, void *vbuf, uint64_t *bufsizep) 634{ 635 int error; 636 zap_cursor_t zc; 637 zap_attribute_t za; 638 zfs_useracct_t *buf = vbuf; 639 uint64_t obj; 640 641 if (!dmu_objset_userspace_present(zfsvfs->z_os)) 642 return (ENOTSUP); 643 644 obj = zfs_userquota_prop_to_obj(zfsvfs, type); 645 if (obj == 0) { 646 *bufsizep = 0; 647 return (0); 648 } 649 650 for (zap_cursor_init_serialized(&zc, zfsvfs->z_os, obj, *cookiep); 651 (error = zap_cursor_retrieve(&zc, &za)) == 0; 652 zap_cursor_advance(&zc)) { 653 if ((uintptr_t)buf - (uintptr_t)vbuf + sizeof (zfs_useracct_t) > 654 *bufsizep) 655 break; 656 657 fuidstr_to_sid(zfsvfs, za.za_name, 658 buf->zu_domain, sizeof (buf->zu_domain), &buf->zu_rid); 659 660 buf->zu_space = za.za_first_integer; 661 buf++; 662 } 663 if (error == ENOENT) 664 error = 0; 665 666 ASSERT3U((uintptr_t)buf - (uintptr_t)vbuf, <=, *bufsizep); 667 *bufsizep = (uintptr_t)buf - (uintptr_t)vbuf; 668 *cookiep = zap_cursor_serialize(&zc); 669 zap_cursor_fini(&zc); 670 return (error); 671} 672 673/* 674 * buf must be big enough (eg, 32 bytes) 675 */ 676static int 677id_to_fuidstr(zfsvfs_t *zfsvfs, const char *domain, uid_t rid, 678 char *buf, boolean_t addok) 679{ 680 uint64_t fuid; 681 int domainid = 0; 682 683 if (domain && domain[0]) { 684 domainid = zfs_fuid_find_by_domain(zfsvfs, domain, NULL, addok); 685 if (domainid == -1) 686 return (ENOENT); 687 } 688 fuid = FUID_ENCODE(domainid, rid); 689 (void) sprintf(buf, "%llx", (longlong_t)fuid); 690 return (0); 691} 692 693int 694zfs_userspace_one(zfsvfs_t *zfsvfs, zfs_userquota_prop_t type, 695 const char *domain, uint64_t rid, uint64_t *valp) 696{ 697 char buf[32]; 698 int err; 699 uint64_t obj; 700 701 *valp = 0; 702 703 if (!dmu_objset_userspace_present(zfsvfs->z_os)) 704 return (ENOTSUP); 705 706 obj = zfs_userquota_prop_to_obj(zfsvfs, type); 707 if (obj == 0) 708 return (0); 709 710 err = id_to_fuidstr(zfsvfs, domain, rid, buf, B_FALSE); 711 if (err) 712 return (err); 713 714 err = zap_lookup(zfsvfs->z_os, obj, buf, 8, 1, valp); 715 if (err == ENOENT) 716 err = 0; 717 return (err); 718} 719 720int 721zfs_set_userquota(zfsvfs_t *zfsvfs, zfs_userquota_prop_t type, 722 const char *domain, uint64_t rid, uint64_t quota) 723{ 724 char buf[32]; 725 int err; 726 dmu_tx_t *tx; 727 uint64_t *objp; 728 boolean_t fuid_dirtied; 729 730 if (type != ZFS_PROP_USERQUOTA && type != ZFS_PROP_GROUPQUOTA) 731 return (EINVAL); 732 733 if (zfsvfs->z_version < ZPL_VERSION_USERSPACE) 734 return (ENOTSUP); 735 736 objp = (type == ZFS_PROP_USERQUOTA) ? &zfsvfs->z_userquota_obj : 737 &zfsvfs->z_groupquota_obj; 738 739 err = id_to_fuidstr(zfsvfs, domain, rid, buf, B_TRUE); 740 if (err) 741 return (err); 742 fuid_dirtied = zfsvfs->z_fuid_dirty; 743 744 tx = dmu_tx_create(zfsvfs->z_os); 745 dmu_tx_hold_zap(tx, *objp ? *objp : DMU_NEW_OBJECT, B_TRUE, NULL); 746 if (*objp == 0) { 747 dmu_tx_hold_zap(tx, MASTER_NODE_OBJ, B_TRUE, 748 zfs_userquota_prop_prefixes[type]); 749 } 750 if (fuid_dirtied) 751 zfs_fuid_txhold(zfsvfs, tx); 752 err = dmu_tx_assign(tx, TXG_WAIT); 753 if (err) { 754 dmu_tx_abort(tx); 755 return (err); 756 } 757 758 mutex_enter(&zfsvfs->z_lock); 759 if (*objp == 0) { 760 *objp = zap_create(zfsvfs->z_os, DMU_OT_USERGROUP_QUOTA, 761 DMU_OT_NONE, 0, tx); 762 VERIFY(0 == zap_add(zfsvfs->z_os, MASTER_NODE_OBJ, 763 zfs_userquota_prop_prefixes[type], 8, 1, objp, tx)); 764 } 765 mutex_exit(&zfsvfs->z_lock); 766 767 if (quota == 0) { 768 err = zap_remove(zfsvfs->z_os, *objp, buf, tx); 769 if (err == ENOENT) 770 err = 0; 771 } else { 772 err = zap_update(zfsvfs->z_os, *objp, buf, 8, 1, "a, tx); 773 } 774 ASSERT(err == 0); 775 if (fuid_dirtied) 776 zfs_fuid_sync(zfsvfs, tx); 777 dmu_tx_commit(tx); 778 return (err); 779} 780 781boolean_t 782zfs_fuid_overquota(zfsvfs_t *zfsvfs, boolean_t isgroup, uint64_t fuid) 783{ 784 char buf[32]; 785 uint64_t used, quota, usedobj, quotaobj; 786 int err; 787 788 usedobj = isgroup ? DMU_GROUPUSED_OBJECT : DMU_USERUSED_OBJECT; 789 quotaobj = isgroup ? zfsvfs->z_groupquota_obj : zfsvfs->z_userquota_obj; 790 791 if (quotaobj == 0 || zfsvfs->z_replay) 792 return (B_FALSE); 793 794 (void) sprintf(buf, "%llx", (longlong_t)fuid); 795 err = zap_lookup(zfsvfs->z_os, quotaobj, buf, 8, 1, "a); 796 if (err != 0) 797 return (B_FALSE); 798 799 err = zap_lookup(zfsvfs->z_os, usedobj, buf, 8, 1, &used); 800 if (err != 0) 801 return (B_FALSE); 802 return (used >= quota); 803} 804 805boolean_t 806zfs_owner_overquota(zfsvfs_t *zfsvfs, znode_t *zp, boolean_t isgroup) 807{ 808 uint64_t fuid; 809 uint64_t quotaobj; 810 811 quotaobj = isgroup ? zfsvfs->z_groupquota_obj : zfsvfs->z_userquota_obj; 812 813 fuid = isgroup ? zp->z_gid : zp->z_uid; 814 815 if (quotaobj == 0 || zfsvfs->z_replay) 816 return (B_FALSE); 817 818 return (zfs_fuid_overquota(zfsvfs, isgroup, fuid)); 819} 820 821int 822zfsvfs_create(const char *osname, zfsvfs_t **zfvp) 823{ 824 objset_t *os; 825 zfsvfs_t *zfsvfs; 826 uint64_t zval; 827 int i, error; 828 uint64_t sa_obj; 829 830 zfsvfs = kmem_zalloc(sizeof (zfsvfs_t), KM_SLEEP); 831 832 /* 833 * We claim to always be readonly so we can open snapshots; 834 * other ZPL code will prevent us from writing to snapshots. 835 */ 836 error = dmu_objset_own(osname, DMU_OST_ZFS, B_TRUE, zfsvfs, &os); 837 if (error) { 838 kmem_free(zfsvfs, sizeof (zfsvfs_t)); 839 return (error); 840 } 841 842 /* 843 * Initialize the zfs-specific filesystem structure. 844 * Should probably make this a kmem cache, shuffle fields, 845 * and just bzero up to z_hold_mtx[]. 846 */ 847 zfsvfs->z_vfs = NULL; 848 zfsvfs->z_parent = zfsvfs; 849 zfsvfs->z_max_blksz = SPA_MAXBLOCKSIZE; 850 zfsvfs->z_show_ctldir = ZFS_SNAPDIR_VISIBLE; 851 zfsvfs->z_os = os; 852 853 error = zfs_get_zplprop(os, ZFS_PROP_VERSION, &zfsvfs->z_version); 854 if (error) { 855 goto out; 856 } else if (zfsvfs->z_version > 857 zfs_zpl_version_map(spa_version(dmu_objset_spa(os)))) { 858 (void) printf("Can't mount a version %lld file system " 859 "on a version %lld pool\n. Pool must be upgraded to mount " 860 "this file system.", (u_longlong_t)zfsvfs->z_version, 861 (u_longlong_t)spa_version(dmu_objset_spa(os))); 862 error = ENOTSUP; 863 goto out; 864 } 865 if ((error = zfs_get_zplprop(os, ZFS_PROP_NORMALIZE, &zval)) != 0) 866 goto out; 867 zfsvfs->z_norm = (int)zval; 868 869 if ((error = zfs_get_zplprop(os, ZFS_PROP_UTF8ONLY, &zval)) != 0) 870 goto out; 871 zfsvfs->z_utf8 = (zval != 0); 872 873 if ((error = zfs_get_zplprop(os, ZFS_PROP_CASE, &zval)) != 0) 874 goto out; 875 zfsvfs->z_case = (uint_t)zval; 876 877 /* 878 * Fold case on file systems that are always or sometimes case 879 * insensitive. 880 */ 881 if (zfsvfs->z_case == ZFS_CASE_INSENSITIVE || 882 zfsvfs->z_case == ZFS_CASE_MIXED) 883 zfsvfs->z_norm |= U8_TEXTPREP_TOUPPER; 884 885 zfsvfs->z_use_fuids = USE_FUIDS(zfsvfs->z_version, zfsvfs->z_os); 886 zfsvfs->z_use_sa = USE_SA(zfsvfs->z_version, zfsvfs->z_os); 887 888 if (zfsvfs->z_use_sa) { 889 /* should either have both of these objects or none */ 890 error = zap_lookup(os, MASTER_NODE_OBJ, ZFS_SA_ATTRS, 8, 1, 891 &sa_obj); 892 if (error) 893 return (error); 894 } else { 895 /* 896 * Pre SA versions file systems should never touch 897 * either the attribute registration or layout objects. 898 */ 899 sa_obj = 0; 900 } 901 902 error = sa_setup(os, sa_obj, zfs_attr_table, ZPL_END, 903 &zfsvfs->z_attr_table); 904 if (error) 905 goto out; 906 907 if (zfsvfs->z_version >= ZPL_VERSION_SA) 908 sa_register_update_callback(os, zfs_sa_upgrade); 909 910 error = zap_lookup(os, MASTER_NODE_OBJ, ZFS_ROOT_OBJ, 8, 1, 911 &zfsvfs->z_root); 912 if (error) 913 goto out; 914 ASSERT(zfsvfs->z_root != 0); 915 916 error = zap_lookup(os, MASTER_NODE_OBJ, ZFS_UNLINKED_SET, 8, 1, 917 &zfsvfs->z_unlinkedobj); 918 if (error) 919 goto out; 920 921 error = zap_lookup(os, MASTER_NODE_OBJ, 922 zfs_userquota_prop_prefixes[ZFS_PROP_USERQUOTA], 923 8, 1, &zfsvfs->z_userquota_obj); 924 if (error && error != ENOENT) 925 goto out; 926 927 error = zap_lookup(os, MASTER_NODE_OBJ, 928 zfs_userquota_prop_prefixes[ZFS_PROP_GROUPQUOTA], 929 8, 1, &zfsvfs->z_groupquota_obj); 930 if (error && error != ENOENT) 931 goto out; 932 933 error = zap_lookup(os, MASTER_NODE_OBJ, ZFS_FUID_TABLES, 8, 1, 934 &zfsvfs->z_fuid_obj); 935 if (error && error != ENOENT) 936 goto out; 937 938 error = zap_lookup(os, MASTER_NODE_OBJ, ZFS_SHARES_DIR, 8, 1, 939 &zfsvfs->z_shares_dir); 940 if (error && error != ENOENT) 941 goto out; 942 943 mutex_init(&zfsvfs->z_znodes_lock, NULL, MUTEX_DEFAULT, NULL); 944 mutex_init(&zfsvfs->z_lock, NULL, MUTEX_DEFAULT, NULL); 945 list_create(&zfsvfs->z_all_znodes, sizeof (znode_t), 946 offsetof(znode_t, z_link_node)); 947 rrw_init(&zfsvfs->z_teardown_lock); 948 rw_init(&zfsvfs->z_teardown_inactive_lock, NULL, RW_DEFAULT, NULL); 949 rw_init(&zfsvfs->z_fuid_lock, NULL, RW_DEFAULT, NULL); 950 for (i = 0; i != ZFS_OBJ_MTX_SZ; i++) 951 mutex_init(&zfsvfs->z_hold_mtx[i], NULL, MUTEX_DEFAULT, NULL); 952 953 *zfvp = zfsvfs; 954 return (0); 955 956out: 957 dmu_objset_disown(os, zfsvfs); 958 *zfvp = NULL; 959 kmem_free(zfsvfs, sizeof (zfsvfs_t)); 960 return (error); 961} 962 963static int 964zfsvfs_setup(zfsvfs_t *zfsvfs, boolean_t mounting) 965{ 966 int error; 967 968 error = zfs_register_callbacks(zfsvfs->z_vfs); 969 if (error) 970 return (error); 971 972 /* 973 * Set the objset user_ptr to track its zfsvfs. 974 */ 975 mutex_enter(&zfsvfs->z_os->os_user_ptr_lock); 976 dmu_objset_set_user(zfsvfs->z_os, zfsvfs); 977 mutex_exit(&zfsvfs->z_os->os_user_ptr_lock); 978 979 zfsvfs->z_log = zil_open(zfsvfs->z_os, zfs_get_data); 980 981 /* 982 * If we are not mounting (ie: online recv), then we don't 983 * have to worry about replaying the log as we blocked all 984 * operations out since we closed the ZIL. 985 */ 986 if (mounting) { 987 boolean_t readonly; 988 989 /* 990 * During replay we remove the read only flag to 991 * allow replays to succeed. 992 */ 993 readonly = zfsvfs->z_vfs->vfs_flag & VFS_RDONLY; 994 if (readonly != 0) 995 zfsvfs->z_vfs->vfs_flag &= ~VFS_RDONLY; 996 else 997 zfs_unlinked_drain(zfsvfs); 998 999 /* 1000 * Parse and replay the intent log. 1001 * 1002 * Because of ziltest, this must be done after 1003 * zfs_unlinked_drain(). (Further note: ziltest 1004 * doesn't use readonly mounts, where 1005 * zfs_unlinked_drain() isn't called.) This is because 1006 * ziltest causes spa_sync() to think it's committed, 1007 * but actually it is not, so the intent log contains 1008 * many txg's worth of changes. 1009 * 1010 * In particular, if object N is in the unlinked set in 1011 * the last txg to actually sync, then it could be 1012 * actually freed in a later txg and then reallocated 1013 * in a yet later txg. This would write a "create 1014 * object N" record to the intent log. Normally, this 1015 * would be fine because the spa_sync() would have 1016 * written out the fact that object N is free, before 1017 * we could write the "create object N" intent log 1018 * record. 1019 * 1020 * But when we are in ziltest mode, we advance the "open 1021 * txg" without actually spa_sync()-ing the changes to 1022 * disk. So we would see that object N is still 1023 * allocated and in the unlinked set, and there is an 1024 * intent log record saying to allocate it. 1025 */ 1026 if (spa_writeable(dmu_objset_spa(zfsvfs->z_os))) { 1027 if (zil_replay_disable) { 1028 zil_destroy(zfsvfs->z_log, B_FALSE); 1029 } else { 1030 zfsvfs->z_replay = B_TRUE; 1031 zil_replay(zfsvfs->z_os, zfsvfs, 1032 zfs_replay_vector); 1033 zfsvfs->z_replay = B_FALSE; 1034 } 1035 } 1036 zfsvfs->z_vfs->vfs_flag |= readonly; /* restore readonly bit */ 1037 } 1038 1039 return (0); 1040} 1041 1042extern krwlock_t zfsvfs_lock; /* in zfs_znode.c */ 1043 1044void 1045zfsvfs_free(zfsvfs_t *zfsvfs) 1046{ 1047 int i; 1048 1049 /* 1050 * This is a barrier to prevent the filesystem from going away in 1051 * zfs_znode_move() until we can safely ensure that the filesystem is 1052 * not unmounted. We consider the filesystem valid before the barrier 1053 * and invalid after the barrier. 1054 */ 1055 rw_enter(&zfsvfs_lock, RW_READER); 1056 rw_exit(&zfsvfs_lock); 1057 1058 zfs_fuid_destroy(zfsvfs); 1059 1060 mutex_destroy(&zfsvfs->z_znodes_lock); 1061 mutex_destroy(&zfsvfs->z_lock); 1062 list_destroy(&zfsvfs->z_all_znodes); 1063 rrw_destroy(&zfsvfs->z_teardown_lock); 1064 rw_destroy(&zfsvfs->z_teardown_inactive_lock); 1065 rw_destroy(&zfsvfs->z_fuid_lock); 1066 for (i = 0; i != ZFS_OBJ_MTX_SZ; i++) 1067 mutex_destroy(&zfsvfs->z_hold_mtx[i]); 1068 kmem_free(zfsvfs, sizeof (zfsvfs_t)); 1069} 1070 1071static void 1072zfs_set_fuid_feature(zfsvfs_t *zfsvfs) 1073{ 1074 zfsvfs->z_use_fuids = USE_FUIDS(zfsvfs->z_version, zfsvfs->z_os); 1075 if (zfsvfs->z_vfs) { 1076 if (zfsvfs->z_use_fuids) { 1077 vfs_set_feature(zfsvfs->z_vfs, VFSFT_XVATTR); 1078 vfs_set_feature(zfsvfs->z_vfs, VFSFT_SYSATTR_VIEWS); 1079 vfs_set_feature(zfsvfs->z_vfs, VFSFT_ACEMASKONACCESS); 1080 vfs_set_feature(zfsvfs->z_vfs, VFSFT_ACLONCREATE); 1081 vfs_set_feature(zfsvfs->z_vfs, VFSFT_ACCESS_FILTER); 1082 vfs_set_feature(zfsvfs->z_vfs, VFSFT_REPARSE); 1083 } else { 1084 vfs_clear_feature(zfsvfs->z_vfs, VFSFT_XVATTR); 1085 vfs_clear_feature(zfsvfs->z_vfs, VFSFT_SYSATTR_VIEWS); 1086 vfs_clear_feature(zfsvfs->z_vfs, VFSFT_ACEMASKONACCESS); 1087 vfs_clear_feature(zfsvfs->z_vfs, VFSFT_ACLONCREATE); 1088 vfs_clear_feature(zfsvfs->z_vfs, VFSFT_ACCESS_FILTER); 1089 vfs_clear_feature(zfsvfs->z_vfs, VFSFT_REPARSE); 1090 } 1091 } 1092 zfsvfs->z_use_sa = USE_SA(zfsvfs->z_version, zfsvfs->z_os); 1093} 1094 1095static int 1096zfs_domount(vfs_t *vfsp, char *osname) 1097{ 1098 uint64_t recordsize, fsid_guid; 1099 int error = 0; 1100 zfsvfs_t *zfsvfs; 1101 vnode_t *vp; 1102 1103 ASSERT(vfsp); 1104 ASSERT(osname); 1105 1106 error = zfsvfs_create(osname, &zfsvfs); 1107 if (error) 1108 return (error); 1109 zfsvfs->z_vfs = vfsp; 1110 1111 if (error = dsl_prop_get_integer(osname, "recordsize", &recordsize, 1112 NULL)) 1113 goto out; 1114 zfsvfs->z_vfs->vfs_bsize = SPA_MINBLOCKSIZE; 1115 zfsvfs->z_vfs->mnt_stat.f_iosize = recordsize; 1116 1117 vfsp->vfs_data = zfsvfs; 1118 vfsp->mnt_flag |= MNT_LOCAL; 1119 vfsp->mnt_kern_flag |= MNTK_MPSAFE; 1120 vfsp->mnt_kern_flag |= MNTK_LOOKUP_SHARED; 1121 vfsp->mnt_kern_flag |= MNTK_SHARED_WRITES; 1122 1123 /* 1124 * The fsid is 64 bits, composed of an 8-bit fs type, which 1125 * separates our fsid from any other filesystem types, and a 1126 * 56-bit objset unique ID. The objset unique ID is unique to 1127 * all objsets open on this system, provided by unique_create(). 1128 * The 8-bit fs type must be put in the low bits of fsid[1] 1129 * because that's where other Solaris filesystems put it. 1130 */ 1131 fsid_guid = dmu_objset_fsid_guid(zfsvfs->z_os); 1132 ASSERT((fsid_guid & ~((1ULL<<56)-1)) == 0); 1133 vfsp->vfs_fsid.val[0] = fsid_guid; 1134 vfsp->vfs_fsid.val[1] = ((fsid_guid>>32) << 8) | 1135 vfsp->mnt_vfc->vfc_typenum & 0xFF; 1136 1137 /* 1138 * Set features for file system. 1139 */ 1140 zfs_set_fuid_feature(zfsvfs); 1141 if (zfsvfs->z_case == ZFS_CASE_INSENSITIVE) { 1142 vfs_set_feature(vfsp, VFSFT_DIRENTFLAGS); 1143 vfs_set_feature(vfsp, VFSFT_CASEINSENSITIVE); 1144 vfs_set_feature(vfsp, VFSFT_NOCASESENSITIVE); 1145 } else if (zfsvfs->z_case == ZFS_CASE_MIXED) { 1146 vfs_set_feature(vfsp, VFSFT_DIRENTFLAGS); 1147 vfs_set_feature(vfsp, VFSFT_CASEINSENSITIVE); 1148 } 1149 vfs_set_feature(vfsp, VFSFT_ZEROCOPY_SUPPORTED); 1150 1151 if (dmu_objset_is_snapshot(zfsvfs->z_os)) { 1152 uint64_t pval; 1153 1154 atime_changed_cb(zfsvfs, B_FALSE); 1155 readonly_changed_cb(zfsvfs, B_TRUE); 1156 if (error = dsl_prop_get_integer(osname, "xattr", &pval, NULL)) 1157 goto out; 1158 xattr_changed_cb(zfsvfs, pval); 1159 zfsvfs->z_issnap = B_TRUE; 1160 zfsvfs->z_os->os_sync = ZFS_SYNC_DISABLED; 1161 1162 mutex_enter(&zfsvfs->z_os->os_user_ptr_lock); 1163 dmu_objset_set_user(zfsvfs->z_os, zfsvfs); 1164 mutex_exit(&zfsvfs->z_os->os_user_ptr_lock); 1165 } else { 1166 error = zfsvfs_setup(zfsvfs, B_TRUE); 1167 } 1168 1169 vfs_mountedfrom(vfsp, osname); 1170 /* Grab extra reference. */ 1171 VERIFY(VFS_ROOT(vfsp, LK_EXCLUSIVE, &vp) == 0); 1172 VOP_UNLOCK(vp, 0); 1173 1174 if (!zfsvfs->z_issnap) 1175 zfsctl_create(zfsvfs); 1176out: 1177 if (error) { 1178 dmu_objset_disown(zfsvfs->z_os, zfsvfs); 1179 zfsvfs_free(zfsvfs); 1180 } else { 1181 atomic_add_32(&zfs_active_fs_count, 1); 1182 } 1183 1184 return (error); 1185} 1186 1187void 1188zfs_unregister_callbacks(zfsvfs_t *zfsvfs) 1189{ 1190 objset_t *os = zfsvfs->z_os; 1191 struct dsl_dataset *ds; 1192 1193 /* 1194 * Unregister properties. 1195 */ 1196 if (!dmu_objset_is_snapshot(os)) { 1197 ds = dmu_objset_ds(os); 1198 VERIFY(dsl_prop_unregister(ds, "atime", atime_changed_cb, 1199 zfsvfs) == 0); 1200 1201 VERIFY(dsl_prop_unregister(ds, "xattr", xattr_changed_cb, 1202 zfsvfs) == 0); 1203 1204 VERIFY(dsl_prop_unregister(ds, "recordsize", blksz_changed_cb, 1205 zfsvfs) == 0); 1206 1207 VERIFY(dsl_prop_unregister(ds, "readonly", readonly_changed_cb, 1208 zfsvfs) == 0); 1209 1210 VERIFY(dsl_prop_unregister(ds, "setuid", setuid_changed_cb, 1211 zfsvfs) == 0); 1212 1213 VERIFY(dsl_prop_unregister(ds, "exec", exec_changed_cb, 1214 zfsvfs) == 0); 1215 1216 VERIFY(dsl_prop_unregister(ds, "snapdir", snapdir_changed_cb, 1217 zfsvfs) == 0); 1218 1219 VERIFY(dsl_prop_unregister(ds, "aclmode", acl_mode_changed_cb, 1220 zfsvfs) == 0); 1221 1222 VERIFY(dsl_prop_unregister(ds, "aclinherit", 1223 acl_inherit_changed_cb, zfsvfs) == 0); 1224 1225 VERIFY(dsl_prop_unregister(ds, "vscan", 1226 vscan_changed_cb, zfsvfs) == 0); 1227 } 1228} 1229 1230#ifdef SECLABEL 1231/* 1232 * Convert a decimal digit string to a uint64_t integer. 1233 */ 1234static int 1235str_to_uint64(char *str, uint64_t *objnum) 1236{ 1237 uint64_t num = 0; 1238 1239 while (*str) { 1240 if (*str < '0' || *str > '9') 1241 return (EINVAL); 1242 1243 num = num*10 + *str++ - '0'; 1244 } 1245 1246 *objnum = num; 1247 return (0); 1248} 1249 1250/* 1251 * The boot path passed from the boot loader is in the form of 1252 * "rootpool-name/root-filesystem-object-number'. Convert this 1253 * string to a dataset name: "rootpool-name/root-filesystem-name". 1254 */ 1255static int 1256zfs_parse_bootfs(char *bpath, char *outpath) 1257{ 1258 char *slashp; 1259 uint64_t objnum; 1260 int error; 1261 1262 if (*bpath == 0 || *bpath == '/') 1263 return (EINVAL); 1264 1265 (void) strcpy(outpath, bpath); 1266 1267 slashp = strchr(bpath, '/'); 1268 1269 /* if no '/', just return the pool name */ 1270 if (slashp == NULL) { 1271 return (0); 1272 } 1273 1274 /* if not a number, just return the root dataset name */ 1275 if (str_to_uint64(slashp+1, &objnum)) { 1276 return (0); 1277 } 1278 1279 *slashp = '\0'; 1280 error = dsl_dsobj_to_dsname(bpath, objnum, outpath); 1281 *slashp = '/'; 1282 1283 return (error); 1284} 1285 1286/* 1287 * zfs_check_global_label: 1288 * Check that the hex label string is appropriate for the dataset 1289 * being mounted into the global_zone proper. 1290 * 1291 * Return an error if the hex label string is not default or 1292 * admin_low/admin_high. For admin_low labels, the corresponding 1293 * dataset must be readonly. 1294 */ 1295int 1296zfs_check_global_label(const char *dsname, const char *hexsl) 1297{ 1298 if (strcasecmp(hexsl, ZFS_MLSLABEL_DEFAULT) == 0) 1299 return (0); 1300 if (strcasecmp(hexsl, ADMIN_HIGH) == 0) 1301 return (0); 1302 if (strcasecmp(hexsl, ADMIN_LOW) == 0) { 1303 /* must be readonly */ 1304 uint64_t rdonly; 1305 1306 if (dsl_prop_get_integer(dsname, 1307 zfs_prop_to_name(ZFS_PROP_READONLY), &rdonly, NULL)) 1308 return (EACCES); 1309 return (rdonly ? 0 : EACCES); 1310 } 1311 return (EACCES); 1312} 1313 1314/* 1315 * zfs_mount_label_policy: 1316 * Determine whether the mount is allowed according to MAC check. 1317 * by comparing (where appropriate) label of the dataset against 1318 * the label of the zone being mounted into. If the dataset has 1319 * no label, create one. 1320 * 1321 * Returns: 1322 * 0 : access allowed 1323 * >0 : error code, such as EACCES 1324 */ 1325static int 1326zfs_mount_label_policy(vfs_t *vfsp, char *osname) 1327{ 1328 int error, retv; 1329 zone_t *mntzone = NULL; 1330 ts_label_t *mnt_tsl; 1331 bslabel_t *mnt_sl; 1332 bslabel_t ds_sl; 1333 char ds_hexsl[MAXNAMELEN]; 1334 1335 retv = EACCES; /* assume the worst */ 1336 1337 /* 1338 * Start by getting the dataset label if it exists. 1339 */ 1340 error = dsl_prop_get(osname, zfs_prop_to_name(ZFS_PROP_MLSLABEL), 1341 1, sizeof (ds_hexsl), &ds_hexsl, NULL); 1342 if (error) 1343 return (EACCES); 1344 1345 /* 1346 * If labeling is NOT enabled, then disallow the mount of datasets 1347 * which have a non-default label already. No other label checks 1348 * are needed. 1349 */ 1350 if (!is_system_labeled()) { 1351 if (strcasecmp(ds_hexsl, ZFS_MLSLABEL_DEFAULT) == 0) 1352 return (0); 1353 return (EACCES); 1354 } 1355 1356 /* 1357 * Get the label of the mountpoint. If mounting into the global 1358 * zone (i.e. mountpoint is not within an active zone and the 1359 * zoned property is off), the label must be default or 1360 * admin_low/admin_high only; no other checks are needed. 1361 */ 1362 mntzone = zone_find_by_any_path(refstr_value(vfsp->vfs_mntpt), B_FALSE); 1363 if (mntzone->zone_id == GLOBAL_ZONEID) { 1364 uint64_t zoned; 1365 1366 zone_rele(mntzone); 1367 1368 if (dsl_prop_get_integer(osname, 1369 zfs_prop_to_name(ZFS_PROP_ZONED), &zoned, NULL)) 1370 return (EACCES); 1371 if (!zoned) 1372 return (zfs_check_global_label(osname, ds_hexsl)); 1373 else 1374 /* 1375 * This is the case of a zone dataset being mounted 1376 * initially, before the zone has been fully created; 1377 * allow this mount into global zone. 1378 */ 1379 return (0); 1380 } 1381 1382 mnt_tsl = mntzone->zone_slabel; 1383 ASSERT(mnt_tsl != NULL); 1384 label_hold(mnt_tsl); 1385 mnt_sl = label2bslabel(mnt_tsl); 1386 1387 if (strcasecmp(ds_hexsl, ZFS_MLSLABEL_DEFAULT) == 0) { 1388 /* 1389 * The dataset doesn't have a real label, so fabricate one. 1390 */ 1391 char *str = NULL; 1392 1393 if (l_to_str_internal(mnt_sl, &str) == 0 && 1394 dsl_prop_set(osname, zfs_prop_to_name(ZFS_PROP_MLSLABEL), 1395 ZPROP_SRC_LOCAL, 1, strlen(str) + 1, str) == 0) 1396 retv = 0; 1397 if (str != NULL) 1398 kmem_free(str, strlen(str) + 1); 1399 } else if (hexstr_to_label(ds_hexsl, &ds_sl) == 0) { 1400 /* 1401 * Now compare labels to complete the MAC check. If the 1402 * labels are equal then allow access. If the mountpoint 1403 * label dominates the dataset label, allow readonly access. 1404 * Otherwise, access is denied. 1405 */ 1406 if (blequal(mnt_sl, &ds_sl)) 1407 retv = 0; 1408 else if (bldominates(mnt_sl, &ds_sl)) { 1409 vfs_setmntopt(vfsp, MNTOPT_RO, NULL, 0); 1410 retv = 0; 1411 } 1412 } 1413 1414 label_rele(mnt_tsl); 1415 zone_rele(mntzone); 1416 return (retv); 1417} 1418#endif /* SECLABEL */ 1419 1420#ifdef OPENSOLARIS_MOUNTROOT 1421static int 1422zfs_mountroot(vfs_t *vfsp, enum whymountroot why) 1423{ 1424 int error = 0; 1425 static int zfsrootdone = 0; 1426 zfsvfs_t *zfsvfs = NULL; 1427 znode_t *zp = NULL; 1428 vnode_t *vp = NULL; 1429 char *zfs_bootfs; 1430 char *zfs_devid; 1431 1432 ASSERT(vfsp); 1433 1434 /* 1435 * The filesystem that we mount as root is defined in the 1436 * boot property "zfs-bootfs" with a format of 1437 * "poolname/root-dataset-objnum". 1438 */ 1439 if (why == ROOT_INIT) { 1440 if (zfsrootdone++) 1441 return (EBUSY); 1442 /* 1443 * the process of doing a spa_load will require the 1444 * clock to be set before we could (for example) do 1445 * something better by looking at the timestamp on 1446 * an uberblock, so just set it to -1. 1447 */ 1448 clkset(-1); 1449 1450 if ((zfs_bootfs = spa_get_bootprop("zfs-bootfs")) == NULL) { 1451 cmn_err(CE_NOTE, "spa_get_bootfs: can not get " 1452 "bootfs name"); 1453 return (EINVAL); 1454 } 1455 zfs_devid = spa_get_bootprop("diskdevid"); 1456 error = spa_import_rootpool(rootfs.bo_name, zfs_devid); 1457 if (zfs_devid) 1458 spa_free_bootprop(zfs_devid); 1459 if (error) { 1460 spa_free_bootprop(zfs_bootfs); 1461 cmn_err(CE_NOTE, "spa_import_rootpool: error %d", 1462 error); 1463 return (error); 1464 } 1465 if (error = zfs_parse_bootfs(zfs_bootfs, rootfs.bo_name)) { 1466 spa_free_bootprop(zfs_bootfs); 1467 cmn_err(CE_NOTE, "zfs_parse_bootfs: error %d", 1468 error); 1469 return (error); 1470 } 1471 1472 spa_free_bootprop(zfs_bootfs); 1473 1474 if (error = vfs_lock(vfsp)) 1475 return (error); 1476 1477 if (error = zfs_domount(vfsp, rootfs.bo_name)) { 1478 cmn_err(CE_NOTE, "zfs_domount: error %d", error); 1479 goto out; 1480 } 1481 1482 zfsvfs = (zfsvfs_t *)vfsp->vfs_data; 1483 ASSERT(zfsvfs); 1484 if (error = zfs_zget(zfsvfs, zfsvfs->z_root, &zp)) { 1485 cmn_err(CE_NOTE, "zfs_zget: error %d", error); 1486 goto out; 1487 } 1488 1489 vp = ZTOV(zp); 1490 mutex_enter(&vp->v_lock); 1491 vp->v_flag |= VROOT; 1492 mutex_exit(&vp->v_lock); 1493 rootvp = vp; 1494 1495 /* 1496 * Leave rootvp held. The root file system is never unmounted. 1497 */ 1498 1499 vfs_add((struct vnode *)0, vfsp, 1500 (vfsp->vfs_flag & VFS_RDONLY) ? MS_RDONLY : 0); 1501out: 1502 vfs_unlock(vfsp); 1503 return (error); 1504 } else if (why == ROOT_REMOUNT) { 1505 readonly_changed_cb(vfsp->vfs_data, B_FALSE); 1506 vfsp->vfs_flag |= VFS_REMOUNT; 1507 1508 /* refresh mount options */ 1509 zfs_unregister_callbacks(vfsp->vfs_data); 1510 return (zfs_register_callbacks(vfsp)); 1511 1512 } else if (why == ROOT_UNMOUNT) { 1513 zfs_unregister_callbacks((zfsvfs_t *)vfsp->vfs_data); 1514 (void) zfs_sync(vfsp, 0, 0); 1515 return (0); 1516 } 1517 1518 /* 1519 * if "why" is equal to anything else other than ROOT_INIT, 1520 * ROOT_REMOUNT, or ROOT_UNMOUNT, we do not support it. 1521 */ 1522 return (ENOTSUP); 1523} 1524#endif /* OPENSOLARIS_MOUNTROOT */ 1525 1526/*ARGSUSED*/ 1527static int 1528zfs_mount(vfs_t *vfsp) 1529{ 1530 kthread_t *td = curthread; 1531 vnode_t *mvp = vfsp->mnt_vnodecovered; 1532 cred_t *cr = td->td_ucred; 1533 char *osname; 1534 int error = 0; 1535 int canwrite; 1536 1537 if (!prison_allow(td->td_ucred, PR_ALLOW_MOUNT_ZFS)) 1538 return (EPERM); 1539 1540 if (vfs_getopt(vfsp->mnt_optnew, "from", (void **)&osname, NULL)) 1541 return (EINVAL); 1542 1543 /* 1544 * If full-owner-access is enabled and delegated administration is 1545 * turned on, we must set nosuid. 1546 */ 1547 if (zfs_super_owner && 1548 dsl_deleg_access(osname, ZFS_DELEG_PERM_MOUNT, cr) != ECANCELED) { 1549 secpolicy_fs_mount_clearopts(cr, vfsp); 1550 } 1551 1552 /* 1553 * Check for mount privilege? 1554 * 1555 * If we don't have privilege then see if 1556 * we have local permission to allow it 1557 */ 1558 error = secpolicy_fs_mount(cr, mvp, vfsp); 1559 if (error) { 1560 if (dsl_deleg_access(osname, ZFS_DELEG_PERM_MOUNT, cr) != 0) 1561 goto out; 1562 1563 if (!(vfsp->vfs_flag & MS_REMOUNT)) { 1564 vattr_t vattr; 1565 1566 /* 1567 * Make sure user is the owner of the mount point 1568 * or has sufficient privileges. 1569 */ 1570 1571 vattr.va_mask = AT_UID; 1572 1573 vn_lock(mvp, LK_SHARED | LK_RETRY); 1574 if (VOP_GETATTR(mvp, &vattr, cr)) { 1575 VOP_UNLOCK(mvp, 0); 1576 goto out; 1577 } 1578 1579 if (secpolicy_vnode_owner(mvp, cr, vattr.va_uid) != 0 && 1580 VOP_ACCESS(mvp, VWRITE, cr, td) != 0) { 1581 VOP_UNLOCK(mvp, 0); 1582 goto out; 1583 } 1584 VOP_UNLOCK(mvp, 0); 1585 } 1586 1587 secpolicy_fs_mount_clearopts(cr, vfsp); 1588 } 1589 1590 /* 1591 * Refuse to mount a filesystem if we are in a local zone and the 1592 * dataset is not visible. 1593 */ 1594 if (!INGLOBALZONE(curthread) && 1595 (!zone_dataset_visible(osname, &canwrite) || !canwrite)) { 1596 error = EPERM; 1597 goto out; 1598 } 1599 1600#ifdef SECLABEL 1601 error = zfs_mount_label_policy(vfsp, osname); 1602 if (error) 1603 goto out; 1604#endif 1605 1606 vfsp->vfs_flag |= MNT_NFS4ACLS; 1607 1608 /* 1609 * When doing a remount, we simply refresh our temporary properties 1610 * according to those options set in the current VFS options. 1611 */ 1612 if (vfsp->vfs_flag & MS_REMOUNT) { 1613 /* refresh mount options */ 1614 zfs_unregister_callbacks(vfsp->vfs_data); 1615 error = zfs_register_callbacks(vfsp); 1616 goto out; 1617 } 1618 1619 DROP_GIANT(); 1620 error = zfs_domount(vfsp, osname); 1621 PICKUP_GIANT(); 1622 1623#ifdef sun 1624 /* 1625 * Add an extra VFS_HOLD on our parent vfs so that it can't 1626 * disappear due to a forced unmount. 1627 */ 1628 if (error == 0 && ((zfsvfs_t *)vfsp->vfs_data)->z_issnap) 1629 VFS_HOLD(mvp->v_vfsp); 1630#endif /* sun */ 1631 1632out: 1633 return (error); 1634} 1635 1636static int 1637zfs_statfs(vfs_t *vfsp, struct statfs *statp) 1638{ 1639 zfsvfs_t *zfsvfs = vfsp->vfs_data; 1640 uint64_t refdbytes, availbytes, usedobjs, availobjs; 1641 1642 statp->f_version = STATFS_VERSION; 1643 1644 ZFS_ENTER(zfsvfs); 1645 1646 dmu_objset_space(zfsvfs->z_os, 1647 &refdbytes, &availbytes, &usedobjs, &availobjs); 1648 1649 /* 1650 * The underlying storage pool actually uses multiple block sizes. 1651 * We report the fragsize as the smallest block size we support, 1652 * and we report our blocksize as the filesystem's maximum blocksize. 1653 */ 1654 statp->f_bsize = SPA_MINBLOCKSIZE; 1655 statp->f_iosize = zfsvfs->z_vfs->mnt_stat.f_iosize; 1656 1657 /* 1658 * The following report "total" blocks of various kinds in the 1659 * file system, but reported in terms of f_frsize - the 1660 * "fragment" size. 1661 */ 1662 1663 statp->f_blocks = (refdbytes + availbytes) >> SPA_MINBLOCKSHIFT; 1664 statp->f_bfree = availbytes / statp->f_bsize; 1665 statp->f_bavail = statp->f_bfree; /* no root reservation */ 1666 1667 /* 1668 * statvfs() should really be called statufs(), because it assumes 1669 * static metadata. ZFS doesn't preallocate files, so the best 1670 * we can do is report the max that could possibly fit in f_files, 1671 * and that minus the number actually used in f_ffree. 1672 * For f_ffree, report the smaller of the number of object available 1673 * and the number of blocks (each object will take at least a block). 1674 */ 1675 statp->f_ffree = MIN(availobjs, statp->f_bfree); 1676 statp->f_files = statp->f_ffree + usedobjs; 1677 1678 /* 1679 * We're a zfs filesystem. 1680 */ 1681 (void) strlcpy(statp->f_fstypename, "zfs", sizeof(statp->f_fstypename)); 1682 1683 strlcpy(statp->f_mntfromname, vfsp->mnt_stat.f_mntfromname, 1684 sizeof(statp->f_mntfromname)); 1685 strlcpy(statp->f_mntonname, vfsp->mnt_stat.f_mntonname, 1686 sizeof(statp->f_mntonname)); 1687 1688 statp->f_namemax = ZFS_MAXNAMELEN; 1689 1690 ZFS_EXIT(zfsvfs); 1691 return (0); 1692} 1693 1694int 1695zfs_vnode_lock(vnode_t *vp, int flags) 1696{ 1697 int error; 1698 1699 ASSERT(vp != NULL); 1700 1701 /* 1702 * Check if the file system wasn't forcibly unmounted in the meantime. 1703 */ 1704 error = vn_lock(vp, flags); 1705 if (error == 0 && (vp->v_iflag & VI_DOOMED) != 0) { 1706 VOP_UNLOCK(vp, 0); 1707 error = ENOENT; 1708 } 1709 1710 return (error); 1711} 1712 1713static int 1714zfs_root(vfs_t *vfsp, int flags, vnode_t **vpp) 1715{ 1716 zfsvfs_t *zfsvfs = vfsp->vfs_data; 1717 znode_t *rootzp; 1718 int error; 1719 1720 ZFS_ENTER_NOERROR(zfsvfs); 1721 1722 error = zfs_zget(zfsvfs, zfsvfs->z_root, &rootzp); 1723 if (error == 0) 1724 *vpp = ZTOV(rootzp); 1725 1726 ZFS_EXIT(zfsvfs); 1727 1728 if (error == 0) { 1729 error = zfs_vnode_lock(*vpp, flags); 1730 if (error == 0) 1731 (*vpp)->v_vflag |= VV_ROOT; 1732 } 1733 if (error != 0) 1734 *vpp = NULL; 1735 1736 return (error); 1737} 1738 1739/* 1740 * Teardown the zfsvfs::z_os. 1741 * 1742 * Note, if 'unmounting' if FALSE, we return with the 'z_teardown_lock' 1743 * and 'z_teardown_inactive_lock' held. 1744 */ 1745static int 1746zfsvfs_teardown(zfsvfs_t *zfsvfs, boolean_t unmounting) 1747{ 1748 znode_t *zp; 1749 1750 rrw_enter(&zfsvfs->z_teardown_lock, RW_WRITER, FTAG); 1751 1752 if (!unmounting) { 1753 /* 1754 * We purge the parent filesystem's vfsp as the parent 1755 * filesystem and all of its snapshots have their vnode's 1756 * v_vfsp set to the parent's filesystem's vfsp. Note, 1757 * 'z_parent' is self referential for non-snapshots. 1758 */ 1759 (void) dnlc_purge_vfsp(zfsvfs->z_parent->z_vfs, 0); 1760#ifdef FREEBSD_NAMECACHE 1761 cache_purgevfs(zfsvfs->z_parent->z_vfs); 1762#endif 1763 } 1764 1765 /* 1766 * Close the zil. NB: Can't close the zil while zfs_inactive 1767 * threads are blocked as zil_close can call zfs_inactive. 1768 */ 1769 if (zfsvfs->z_log) { 1770 zil_close(zfsvfs->z_log); 1771 zfsvfs->z_log = NULL; 1772 } 1773 1774 rw_enter(&zfsvfs->z_teardown_inactive_lock, RW_WRITER); 1775 1776 /* 1777 * If we are not unmounting (ie: online recv) and someone already 1778 * unmounted this file system while we were doing the switcheroo, 1779 * or a reopen of z_os failed then just bail out now. 1780 */ 1781 if (!unmounting && (zfsvfs->z_unmounted || zfsvfs->z_os == NULL)) { 1782 rw_exit(&zfsvfs->z_teardown_inactive_lock); 1783 rrw_exit(&zfsvfs->z_teardown_lock, FTAG); 1784 return (EIO); 1785 } 1786 1787 /* 1788 * At this point there are no vops active, and any new vops will 1789 * fail with EIO since we have z_teardown_lock for writer (only 1790 * relavent for forced unmount). 1791 * 1792 * Release all holds on dbufs. 1793 */ 1794 mutex_enter(&zfsvfs->z_znodes_lock); 1795 for (zp = list_head(&zfsvfs->z_all_znodes); zp != NULL; 1796 zp = list_next(&zfsvfs->z_all_znodes, zp)) 1797 if (zp->z_sa_hdl) { 1798 ASSERT(ZTOV(zp)->v_count >= 0); 1799 zfs_znode_dmu_fini(zp); 1800 } 1801 mutex_exit(&zfsvfs->z_znodes_lock); 1802 1803 /* 1804 * If we are unmounting, set the unmounted flag and let new vops 1805 * unblock. zfs_inactive will have the unmounted behavior, and all 1806 * other vops will fail with EIO. 1807 */ 1808 if (unmounting) { 1809 zfsvfs->z_unmounted = B_TRUE; 1810 rrw_exit(&zfsvfs->z_teardown_lock, FTAG); 1811 rw_exit(&zfsvfs->z_teardown_inactive_lock); 1812 1813#ifdef __FreeBSD__ 1814 /* 1815 * Some znodes might not be fully reclaimed, wait for them. 1816 */ 1817 mutex_enter(&zfsvfs->z_znodes_lock); 1818 while (list_head(&zfsvfs->z_all_znodes) != NULL) { 1819 msleep(zfsvfs, &zfsvfs->z_znodes_lock, 0, 1820 "zteardown", 0); 1821 } 1822 mutex_exit(&zfsvfs->z_znodes_lock); 1823#endif 1824 } 1825 1826 /* 1827 * z_os will be NULL if there was an error in attempting to reopen 1828 * zfsvfs, so just return as the properties had already been 1829 * unregistered and cached data had been evicted before. 1830 */ 1831 if (zfsvfs->z_os == NULL) 1832 return (0); 1833 1834 /* 1835 * Unregister properties. 1836 */ 1837 zfs_unregister_callbacks(zfsvfs); 1838 1839 /* 1840 * Evict cached data 1841 */ 1842 if (dmu_objset_is_dirty_anywhere(zfsvfs->z_os)) 1843 if (!(zfsvfs->z_vfs->vfs_flag & VFS_RDONLY)) 1844 txg_wait_synced(dmu_objset_pool(zfsvfs->z_os), 0); 1845 (void) dmu_objset_evict_dbufs(zfsvfs->z_os); 1846 1847 return (0); 1848} 1849 1850/*ARGSUSED*/ 1851static int 1852zfs_umount(vfs_t *vfsp, int fflag) 1853{ 1854 kthread_t *td = curthread; 1855 zfsvfs_t *zfsvfs = vfsp->vfs_data; 1856 objset_t *os; 1857 cred_t *cr = td->td_ucred; 1858 int ret; 1859 1860 ret = secpolicy_fs_unmount(cr, vfsp); 1861 if (ret) { 1862 if (dsl_deleg_access((char *)refstr_value(vfsp->vfs_resource), 1863 ZFS_DELEG_PERM_MOUNT, cr)) 1864 return (ret); 1865 } 1866 1867 /* 1868 * We purge the parent filesystem's vfsp as the parent filesystem 1869 * and all of its snapshots have their vnode's v_vfsp set to the 1870 * parent's filesystem's vfsp. Note, 'z_parent' is self 1871 * referential for non-snapshots. 1872 */ 1873 (void) dnlc_purge_vfsp(zfsvfs->z_parent->z_vfs, 0); 1874 1875 /* 1876 * Unmount any snapshots mounted under .zfs before unmounting the 1877 * dataset itself. 1878 */ 1879 if (zfsvfs->z_ctldir != NULL) { 1880 if ((ret = zfsctl_umount_snapshots(vfsp, fflag, cr)) != 0) 1881 return (ret); 1882 ret = vflush(vfsp, 0, 0, td); 1883 ASSERT(ret == EBUSY); 1884 if (!(fflag & MS_FORCE)) { 1885 if (zfsvfs->z_ctldir->v_count > 1) 1886 return (EBUSY); 1887 ASSERT(zfsvfs->z_ctldir->v_count == 1); 1888 } 1889 zfsctl_destroy(zfsvfs); 1890 ASSERT(zfsvfs->z_ctldir == NULL); 1891 } 1892 1893 if (fflag & MS_FORCE) { 1894 /* 1895 * Mark file system as unmounted before calling 1896 * vflush(FORCECLOSE). This way we ensure no future vnops 1897 * will be called and risk operating on DOOMED vnodes. 1898 */ 1899 rrw_enter(&zfsvfs->z_teardown_lock, RW_WRITER, FTAG); 1900 zfsvfs->z_unmounted = B_TRUE; 1901 rrw_exit(&zfsvfs->z_teardown_lock, FTAG); 1902 } 1903 1904 /* 1905 * Flush all the files. 1906 */ 1907 ret = vflush(vfsp, 1, (fflag & MS_FORCE) ? FORCECLOSE : 0, td); 1908 if (ret != 0) { 1909 if (!zfsvfs->z_issnap) { 1910 zfsctl_create(zfsvfs); 1911 ASSERT(zfsvfs->z_ctldir != NULL); 1912 } 1913 return (ret); 1914 } 1915 1916 if (!(fflag & MS_FORCE)) { 1917 /* 1918 * Check the number of active vnodes in the file system. 1919 * Our count is maintained in the vfs structure, but the 1920 * number is off by 1 to indicate a hold on the vfs 1921 * structure itself. 1922 * 1923 * The '.zfs' directory maintains a reference of its 1924 * own, and any active references underneath are 1925 * reflected in the vnode count. 1926 */ 1927 if (zfsvfs->z_ctldir == NULL) { 1928 if (vfsp->vfs_count > 1) 1929 return (EBUSY); 1930 } else { 1931 if (vfsp->vfs_count > 2 || 1932 zfsvfs->z_ctldir->v_count > 1) 1933 return (EBUSY); 1934 } 1935 } else { 1936 MNT_ILOCK(vfsp); 1937 vfsp->mnt_kern_flag |= MNTK_UNMOUNTF; 1938 MNT_IUNLOCK(vfsp); 1939 } 1940 1941 VERIFY(zfsvfs_teardown(zfsvfs, B_TRUE) == 0); 1942 os = zfsvfs->z_os; 1943 1944 /* 1945 * z_os will be NULL if there was an error in 1946 * attempting to reopen zfsvfs. 1947 */ 1948 if (os != NULL) { 1949 /* 1950 * Unset the objset user_ptr. 1951 */ 1952 mutex_enter(&os->os_user_ptr_lock); 1953 dmu_objset_set_user(os, NULL); 1954 mutex_exit(&os->os_user_ptr_lock); 1955 1956 /* 1957 * Finally release the objset 1958 */ 1959 dmu_objset_disown(os, zfsvfs); 1960 } 1961 1962 /* 1963 * We can now safely destroy the '.zfs' directory node. 1964 */ 1965 if (zfsvfs->z_ctldir != NULL) 1966 zfsctl_destroy(zfsvfs); 1967 if (zfsvfs->z_issnap) { 1968 vnode_t *svp = vfsp->mnt_vnodecovered; 1969 1970 if (svp->v_count >= 2) 1971 VN_RELE(svp); 1972 } 1973 zfs_freevfs(vfsp); 1974 1975 return (0); 1976} 1977 1978static int 1979zfs_vget(vfs_t *vfsp, ino_t ino, int flags, vnode_t **vpp) 1980{ 1981 zfsvfs_t *zfsvfs = vfsp->vfs_data; 1982 znode_t *zp; 1983 int err; 1984 1985 /* 1986 * zfs_zget() can't operate on virtual entries like .zfs/ or 1987 * .zfs/snapshot/ directories, that's why we return EOPNOTSUPP. 1988 * This will make NFS to switch to LOOKUP instead of using VGET. 1989 */ 1990 if (ino == ZFSCTL_INO_ROOT || ino == ZFSCTL_INO_SNAPDIR) 1991 return (EOPNOTSUPP); 1992 1993 ZFS_ENTER(zfsvfs); 1994 err = zfs_zget(zfsvfs, ino, &zp); 1995 if (err == 0 && zp->z_unlinked) { 1996 VN_RELE(ZTOV(zp)); 1997 err = EINVAL; 1998 } 1999 if (err == 0) 2000 *vpp = ZTOV(zp); 2001 ZFS_EXIT(zfsvfs); 2002 if (err == 0) 2003 err = zfs_vnode_lock(*vpp, flags); 2004 if (err != 0) 2005 *vpp = NULL; 2006 return (err); 2007} 2008 2009static int 2010zfs_checkexp(vfs_t *vfsp, struct sockaddr *nam, int *extflagsp, 2011 struct ucred **credanonp, int *numsecflavors, int **secflavors) 2012{ 2013 zfsvfs_t *zfsvfs = vfsp->vfs_data; 2014 2015 /* 2016 * If this is regular file system vfsp is the same as 2017 * zfsvfs->z_parent->z_vfs, but if it is snapshot, 2018 * zfsvfs->z_parent->z_vfs represents parent file system 2019 * which we have to use here, because only this file system 2020 * has mnt_export configured. 2021 */ 2022 return (vfs_stdcheckexp(zfsvfs->z_parent->z_vfs, nam, extflagsp, 2023 credanonp, numsecflavors, secflavors)); 2024} 2025 2026CTASSERT(SHORT_FID_LEN <= sizeof(struct fid)); 2027CTASSERT(LONG_FID_LEN <= sizeof(struct fid)); 2028 2029static int 2030zfs_fhtovp(vfs_t *vfsp, fid_t *fidp, int flags, vnode_t **vpp) 2031{ 2032 zfsvfs_t *zfsvfs = vfsp->vfs_data; 2033 znode_t *zp; 2034 uint64_t object = 0; 2035 uint64_t fid_gen = 0; 2036 uint64_t gen_mask; 2037 uint64_t zp_gen; 2038 int i, err; 2039 2040 *vpp = NULL; 2041 2042 ZFS_ENTER(zfsvfs); 2043 2044 /* 2045 * On FreeBSD we can get snapshot's mount point or its parent file 2046 * system mount point depending if snapshot is already mounted or not. 2047 */ 2048 if (zfsvfs->z_parent == zfsvfs && fidp->fid_len == LONG_FID_LEN) { 2049 zfid_long_t *zlfid = (zfid_long_t *)fidp; 2050 uint64_t objsetid = 0; 2051 uint64_t setgen = 0; 2052 2053 for (i = 0; i < sizeof (zlfid->zf_setid); i++) 2054 objsetid |= ((uint64_t)zlfid->zf_setid[i]) << (8 * i); 2055 2056 for (i = 0; i < sizeof (zlfid->zf_setgen); i++) 2057 setgen |= ((uint64_t)zlfid->zf_setgen[i]) << (8 * i); 2058 2059 ZFS_EXIT(zfsvfs); 2060 2061 err = zfsctl_lookup_objset(vfsp, objsetid, &zfsvfs); 2062 if (err) 2063 return (EINVAL); 2064 ZFS_ENTER(zfsvfs); 2065 } 2066 2067 if (fidp->fid_len == SHORT_FID_LEN || fidp->fid_len == LONG_FID_LEN) { 2068 zfid_short_t *zfid = (zfid_short_t *)fidp; 2069 2070 for (i = 0; i < sizeof (zfid->zf_object); i++) 2071 object |= ((uint64_t)zfid->zf_object[i]) << (8 * i); 2072 2073 for (i = 0; i < sizeof (zfid->zf_gen); i++) 2074 fid_gen |= ((uint64_t)zfid->zf_gen[i]) << (8 * i); 2075 } else { 2076 ZFS_EXIT(zfsvfs); 2077 return (EINVAL); 2078 } 2079 2080 /* A zero fid_gen means we are in the .zfs control directories */ 2081 if (fid_gen == 0 && 2082 (object == ZFSCTL_INO_ROOT || object == ZFSCTL_INO_SNAPDIR)) { 2083 *vpp = zfsvfs->z_ctldir; 2084 ASSERT(*vpp != NULL); 2085 if (object == ZFSCTL_INO_SNAPDIR) { 2086 VERIFY(zfsctl_root_lookup(*vpp, "snapshot", vpp, NULL, 2087 0, NULL, NULL, NULL, NULL, NULL) == 0); 2088 } else { 2089 VN_HOLD(*vpp); 2090 } 2091 ZFS_EXIT(zfsvfs); 2092 err = zfs_vnode_lock(*vpp, flags | LK_RETRY); 2093 if (err != 0) 2094 *vpp = NULL; 2095 return (err); 2096 } 2097 2098 gen_mask = -1ULL >> (64 - 8 * i); 2099 2100 dprintf("getting %llu [%u mask %llx]\n", object, fid_gen, gen_mask); 2101 if (err = zfs_zget(zfsvfs, object, &zp)) { 2102 ZFS_EXIT(zfsvfs); 2103 return (err); 2104 } 2105 (void) sa_lookup(zp->z_sa_hdl, SA_ZPL_GEN(zfsvfs), &zp_gen, 2106 sizeof (uint64_t)); 2107 zp_gen = zp_gen & gen_mask; 2108 if (zp_gen == 0) 2109 zp_gen = 1; 2110 if (zp->z_unlinked || zp_gen != fid_gen) { 2111 dprintf("znode gen (%u) != fid gen (%u)\n", zp_gen, fid_gen); 2112 VN_RELE(ZTOV(zp)); 2113 ZFS_EXIT(zfsvfs); 2114 return (EINVAL); 2115 } 2116 2117 *vpp = ZTOV(zp); 2118 ZFS_EXIT(zfsvfs); 2119 err = zfs_vnode_lock(*vpp, flags | LK_RETRY); 2120 if (err == 0) 2121 vnode_create_vobject(*vpp, zp->z_size, curthread); 2122 else 2123 *vpp = NULL; 2124 return (err); 2125} 2126 2127/* 2128 * Block out VOPs and close zfsvfs_t::z_os 2129 * 2130 * Note, if successful, then we return with the 'z_teardown_lock' and 2131 * 'z_teardown_inactive_lock' write held. 2132 */ 2133int 2134zfs_suspend_fs(zfsvfs_t *zfsvfs) 2135{ 2136 int error; 2137 2138 if ((error = zfsvfs_teardown(zfsvfs, B_FALSE)) != 0) 2139 return (error); 2140 dmu_objset_disown(zfsvfs->z_os, zfsvfs); 2141 2142 return (0); 2143} 2144 2145/* 2146 * Reopen zfsvfs_t::z_os and release VOPs. 2147 */ 2148int 2149zfs_resume_fs(zfsvfs_t *zfsvfs, const char *osname) 2150{ 2151 int err; 2152 2153 ASSERT(RRW_WRITE_HELD(&zfsvfs->z_teardown_lock)); 2154 ASSERT(RW_WRITE_HELD(&zfsvfs->z_teardown_inactive_lock)); 2155 2156 err = dmu_objset_own(osname, DMU_OST_ZFS, B_FALSE, zfsvfs, 2157 &zfsvfs->z_os); 2158 if (err) { 2159 zfsvfs->z_os = NULL; 2160 } else { 2161 znode_t *zp; 2162 uint64_t sa_obj = 0; 2163 2164 /* 2165 * Make sure version hasn't changed 2166 */ 2167 2168 err = zfs_get_zplprop(zfsvfs->z_os, ZFS_PROP_VERSION, 2169 &zfsvfs->z_version); 2170 2171 if (err) 2172 goto bail; 2173 2174 err = zap_lookup(zfsvfs->z_os, MASTER_NODE_OBJ, 2175 ZFS_SA_ATTRS, 8, 1, &sa_obj); 2176 2177 if (err && zfsvfs->z_version >= ZPL_VERSION_SA) 2178 goto bail; 2179 2180 if ((err = sa_setup(zfsvfs->z_os, sa_obj, 2181 zfs_attr_table, ZPL_END, &zfsvfs->z_attr_table)) != 0) 2182 goto bail; 2183 2184 if (zfsvfs->z_version >= ZPL_VERSION_SA) 2185 sa_register_update_callback(zfsvfs->z_os, 2186 zfs_sa_upgrade); 2187 2188 VERIFY(zfsvfs_setup(zfsvfs, B_FALSE) == 0); 2189 2190 zfs_set_fuid_feature(zfsvfs); 2191 2192 /* 2193 * Attempt to re-establish all the active znodes with 2194 * their dbufs. If a zfs_rezget() fails, then we'll let 2195 * any potential callers discover that via ZFS_ENTER_VERIFY_VP 2196 * when they try to use their znode. 2197 */ 2198 mutex_enter(&zfsvfs->z_znodes_lock); 2199 for (zp = list_head(&zfsvfs->z_all_znodes); zp; 2200 zp = list_next(&zfsvfs->z_all_znodes, zp)) { 2201 (void) zfs_rezget(zp); 2202 } 2203 mutex_exit(&zfsvfs->z_znodes_lock); 2204 } 2205 2206bail: 2207 /* release the VOPs */ 2208 rw_exit(&zfsvfs->z_teardown_inactive_lock); 2209 rrw_exit(&zfsvfs->z_teardown_lock, FTAG); 2210 2211 if (err) { 2212 /* 2213 * Since we couldn't reopen zfsvfs::z_os, or 2214 * setup the sa framework force unmount this file system. 2215 */ 2216 if (vn_vfswlock(zfsvfs->z_vfs->vfs_vnodecovered) == 0) 2217 (void) dounmount(zfsvfs->z_vfs, MS_FORCE, curthread); 2218 } 2219 return (err); 2220} 2221 2222static void 2223zfs_freevfs(vfs_t *vfsp) 2224{ 2225 zfsvfs_t *zfsvfs = vfsp->vfs_data; 2226 2227#ifdef sun 2228 /* 2229 * If this is a snapshot, we have an extra VFS_HOLD on our parent 2230 * from zfs_mount(). Release it here. If we came through 2231 * zfs_mountroot() instead, we didn't grab an extra hold, so 2232 * skip the VFS_RELE for rootvfs. 2233 */ 2234 if (zfsvfs->z_issnap && (vfsp != rootvfs)) 2235 VFS_RELE(zfsvfs->z_parent->z_vfs); 2236#endif /* sun */ 2237 2238 zfsvfs_free(zfsvfs); 2239 2240 atomic_add_32(&zfs_active_fs_count, -1); 2241} 2242 2243#ifdef __i386__ 2244static int desiredvnodes_backup; 2245#endif 2246 2247static void 2248zfs_vnodes_adjust(void) 2249{ 2250#ifdef __i386__ 2251 int newdesiredvnodes; 2252 2253 desiredvnodes_backup = desiredvnodes; 2254 2255 /* 2256 * We calculate newdesiredvnodes the same way it is done in 2257 * vntblinit(). If it is equal to desiredvnodes, it means that 2258 * it wasn't tuned by the administrator and we can tune it down. 2259 */ 2260 newdesiredvnodes = min(maxproc + cnt.v_page_count / 4, 2 * 2261 vm_kmem_size / (5 * (sizeof(struct vm_object) + 2262 sizeof(struct vnode)))); 2263 if (newdesiredvnodes == desiredvnodes) 2264 desiredvnodes = (3 * newdesiredvnodes) / 4; 2265#endif 2266} 2267 2268static void 2269zfs_vnodes_adjust_back(void) 2270{ 2271 2272#ifdef __i386__ 2273 desiredvnodes = desiredvnodes_backup; 2274#endif 2275} 2276 2277void 2278zfs_init(void) 2279{ 2280 2281 printf("ZFS filesystem version " ZPL_VERSION_STRING "\n"); 2282 2283 /* 2284 * Initialize .zfs directory structures 2285 */ 2286 zfsctl_init(); 2287 2288 /* 2289 * Initialize znode cache, vnode ops, etc... 2290 */ 2291 zfs_znode_init(); 2292 2293 /* 2294 * Reduce number of vnodes. Originally number of vnodes is calculated 2295 * with UFS inode in mind. We reduce it here, because it's too big for 2296 * ZFS/i386. 2297 */ 2298 zfs_vnodes_adjust(); 2299 2300 dmu_objset_register_type(DMU_OST_ZFS, zfs_space_delta_cb); 2301} 2302 2303void 2304zfs_fini(void) 2305{ 2306 zfsctl_fini(); 2307 zfs_znode_fini(); 2308 zfs_vnodes_adjust_back(); 2309} 2310 2311int 2312zfs_busy(void) 2313{ 2314 return (zfs_active_fs_count != 0); 2315} 2316 2317int 2318zfs_set_version(zfsvfs_t *zfsvfs, uint64_t newvers) 2319{ 2320 int error; 2321 objset_t *os = zfsvfs->z_os; 2322 dmu_tx_t *tx; 2323 2324 if (newvers < ZPL_VERSION_INITIAL || newvers > ZPL_VERSION) 2325 return (EINVAL); 2326 2327 if (newvers < zfsvfs->z_version) 2328 return (EINVAL); 2329 2330 if (zfs_spa_version_map(newvers) > 2331 spa_version(dmu_objset_spa(zfsvfs->z_os))) 2332 return (ENOTSUP); 2333 2334 tx = dmu_tx_create(os); 2335 dmu_tx_hold_zap(tx, MASTER_NODE_OBJ, B_FALSE, ZPL_VERSION_STR); 2336 if (newvers >= ZPL_VERSION_SA && !zfsvfs->z_use_sa) { 2337 dmu_tx_hold_zap(tx, MASTER_NODE_OBJ, B_TRUE, 2338 ZFS_SA_ATTRS); 2339 dmu_tx_hold_zap(tx, DMU_NEW_OBJECT, FALSE, NULL); 2340 } 2341 error = dmu_tx_assign(tx, TXG_WAIT); 2342 if (error) { 2343 dmu_tx_abort(tx); 2344 return (error); 2345 } 2346 2347 error = zap_update(os, MASTER_NODE_OBJ, ZPL_VERSION_STR, 2348 8, 1, &newvers, tx); 2349 2350 if (error) { 2351 dmu_tx_commit(tx); 2352 return (error); 2353 } 2354 2355 if (newvers >= ZPL_VERSION_SA && !zfsvfs->z_use_sa) { 2356 uint64_t sa_obj; 2357 2358 ASSERT3U(spa_version(dmu_objset_spa(zfsvfs->z_os)), >=, 2359 SPA_VERSION_SA); 2360 sa_obj = zap_create(os, DMU_OT_SA_MASTER_NODE, 2361 DMU_OT_NONE, 0, tx); 2362 2363 error = zap_add(os, MASTER_NODE_OBJ, 2364 ZFS_SA_ATTRS, 8, 1, &sa_obj, tx); 2365 ASSERT3U(error, ==, 0); 2366 2367 VERIFY(0 == sa_set_sa_object(os, sa_obj)); 2368 sa_register_update_callback(os, zfs_sa_upgrade); 2369 } 2370 2371 spa_history_log_internal(LOG_DS_UPGRADE, 2372 dmu_objset_spa(os), tx, "oldver=%llu newver=%llu dataset = %llu", 2373 zfsvfs->z_version, newvers, dmu_objset_id(os)); 2374 2375 dmu_tx_commit(tx); 2376 2377 zfsvfs->z_version = newvers; 2378 2379 zfs_set_fuid_feature(zfsvfs); 2380 2381 return (0); 2382} 2383 2384/* 2385 * Read a property stored within the master node. 2386 */ 2387int 2388zfs_get_zplprop(objset_t *os, zfs_prop_t prop, uint64_t *value) 2389{ 2390 const char *pname; 2391 int error = ENOENT; 2392 2393 /* 2394 * Look up the file system's value for the property. For the 2395 * version property, we look up a slightly different string. 2396 */ 2397 if (prop == ZFS_PROP_VERSION) 2398 pname = ZPL_VERSION_STR; 2399 else 2400 pname = zfs_prop_to_name(prop); 2401 2402 if (os != NULL) 2403 error = zap_lookup(os, MASTER_NODE_OBJ, pname, 8, 1, value); 2404 2405 if (error == ENOENT) { 2406 /* No value set, use the default value */ 2407 switch (prop) { 2408 case ZFS_PROP_VERSION: 2409 *value = ZPL_VERSION; 2410 break; 2411 case ZFS_PROP_NORMALIZE: 2412 case ZFS_PROP_UTF8ONLY: 2413 *value = 0; 2414 break; 2415 case ZFS_PROP_CASE: 2416 *value = ZFS_CASE_SENSITIVE; 2417 break; 2418 default: 2419 return (error); 2420 } 2421 error = 0; 2422 } 2423 return (error); 2424} 2425 2426#ifdef _KERNEL 2427void 2428zfsvfs_update_fromname(const char *oldname, const char *newname) 2429{ 2430 char tmpbuf[MAXPATHLEN]; 2431 struct mount *mp; 2432 char *fromname; 2433 size_t oldlen; 2434 2435 oldlen = strlen(oldname); 2436 2437 mtx_lock(&mountlist_mtx); 2438 TAILQ_FOREACH(mp, &mountlist, mnt_list) { 2439 fromname = mp->mnt_stat.f_mntfromname; 2440 if (strcmp(fromname, oldname) == 0) { 2441 (void)strlcpy(fromname, newname, 2442 sizeof(mp->mnt_stat.f_mntfromname)); 2443 continue; 2444 } 2445 if (strncmp(fromname, oldname, oldlen) == 0 && 2446 (fromname[oldlen] == '/' || fromname[oldlen] == '@')) { 2447 (void)snprintf(tmpbuf, sizeof(tmpbuf), "%s%s", 2448 newname, fromname + oldlen); 2449 (void)strlcpy(fromname, tmpbuf, 2450 sizeof(mp->mnt_stat.f_mntfromname)); 2451 continue; 2452 } 2453 } 2454 mtx_unlock(&mountlist_mtx); 2455} 2456#endif 2457