zfs_vfsops.c revision 297112
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 * Copyright (c) 2012, 2014 by Delphix. All rights reserved. 26 * Copyright (c) 2014 Integros [integros.com] 27 */ 28 29/* Portions Copyright 2010 Robert Milkowski */ 30 31#include <sys/types.h> 32#include <sys/param.h> 33#include <sys/systm.h> 34#include <sys/kernel.h> 35#include <sys/sysmacros.h> 36#include <sys/kmem.h> 37#include <sys/acl.h> 38#include <sys/vnode.h> 39#include <sys/vfs.h> 40#include <sys/mntent.h> 41#include <sys/mount.h> 42#include <sys/cmn_err.h> 43#include <sys/zfs_znode.h> 44#include <sys/zfs_dir.h> 45#include <sys/zil.h> 46#include <sys/fs/zfs.h> 47#include <sys/dmu.h> 48#include <sys/dsl_prop.h> 49#include <sys/dsl_dataset.h> 50#include <sys/dsl_deleg.h> 51#include <sys/spa.h> 52#include <sys/zap.h> 53#include <sys/sa.h> 54#include <sys/sa_impl.h> 55#include <sys/varargs.h> 56#include <sys/policy.h> 57#include <sys/atomic.h> 58#include <sys/zfs_ioctl.h> 59#include <sys/zfs_ctldir.h> 60#include <sys/zfs_fuid.h> 61#include <sys/sunddi.h> 62#include <sys/dnlc.h> 63#include <sys/dmu_objset.h> 64#include <sys/spa_boot.h> 65#include <sys/jail.h> 66#include "zfs_comutil.h" 67 68struct mtx zfs_debug_mtx; 69MTX_SYSINIT(zfs_debug_mtx, &zfs_debug_mtx, "zfs_debug", MTX_DEF); 70 71SYSCTL_NODE(_vfs, OID_AUTO, zfs, CTLFLAG_RW, 0, "ZFS file system"); 72 73int zfs_super_owner; 74SYSCTL_INT(_vfs_zfs, OID_AUTO, super_owner, CTLFLAG_RW, &zfs_super_owner, 0, 75 "File system owner can perform privileged operation on his file systems"); 76 77int zfs_debug_level; 78TUNABLE_INT("vfs.zfs.debug", &zfs_debug_level); 79SYSCTL_INT(_vfs_zfs, OID_AUTO, debug, CTLFLAG_RW, &zfs_debug_level, 0, 80 "Debug level"); 81 82SYSCTL_NODE(_vfs_zfs, OID_AUTO, version, CTLFLAG_RD, 0, "ZFS versions"); 83static int zfs_version_acl = ZFS_ACL_VERSION; 84SYSCTL_INT(_vfs_zfs_version, OID_AUTO, acl, CTLFLAG_RD, &zfs_version_acl, 0, 85 "ZFS_ACL_VERSION"); 86static int zfs_version_spa = SPA_VERSION; 87SYSCTL_INT(_vfs_zfs_version, OID_AUTO, spa, CTLFLAG_RD, &zfs_version_spa, 0, 88 "SPA_VERSION"); 89static int zfs_version_zpl = ZPL_VERSION; 90SYSCTL_INT(_vfs_zfs_version, OID_AUTO, zpl, CTLFLAG_RD, &zfs_version_zpl, 0, 91 "ZPL_VERSION"); 92 93static int zfs_mount(vfs_t *vfsp); 94static int zfs_umount(vfs_t *vfsp, int fflag); 95static int zfs_root(vfs_t *vfsp, int flags, vnode_t **vpp); 96static int zfs_statfs(vfs_t *vfsp, struct statfs *statp); 97static int zfs_vget(vfs_t *vfsp, ino_t ino, int flags, vnode_t **vpp); 98static int zfs_sync(vfs_t *vfsp, int waitfor); 99static int zfs_checkexp(vfs_t *vfsp, struct sockaddr *nam, int *extflagsp, 100 struct ucred **credanonp, int *numsecflavors, int **secflavors); 101static int zfs_fhtovp(vfs_t *vfsp, fid_t *fidp, int flags, vnode_t **vpp); 102static void zfs_objset_close(zfsvfs_t *zfsvfs); 103static void zfs_freevfs(vfs_t *vfsp); 104 105static struct vfsops zfs_vfsops = { 106 .vfs_mount = zfs_mount, 107 .vfs_unmount = zfs_umount, 108 .vfs_root = zfs_root, 109 .vfs_statfs = zfs_statfs, 110 .vfs_vget = zfs_vget, 111 .vfs_sync = zfs_sync, 112 .vfs_checkexp = zfs_checkexp, 113 .vfs_fhtovp = zfs_fhtovp, 114}; 115 116VFS_SET(zfs_vfsops, zfs, VFCF_JAIL | VFCF_DELEGADMIN); 117 118/* 119 * We need to keep a count of active fs's. 120 * This is necessary to prevent our module 121 * from being unloaded after a umount -f 122 */ 123static uint32_t zfs_active_fs_count = 0; 124 125/*ARGSUSED*/ 126static int 127zfs_sync(vfs_t *vfsp, int waitfor) 128{ 129 130 /* 131 * Data integrity is job one. We don't want a compromised kernel 132 * writing to the storage pool, so we never sync during panic. 133 */ 134 if (panicstr) 135 return (0); 136 137 /* 138 * Ignore the system syncher. ZFS already commits async data 139 * at zfs_txg_timeout intervals. 140 */ 141 if (waitfor == MNT_LAZY) 142 return (0); 143 144 if (vfsp != NULL) { 145 /* 146 * Sync a specific filesystem. 147 */ 148 zfsvfs_t *zfsvfs = vfsp->vfs_data; 149 dsl_pool_t *dp; 150 int error; 151 152 error = vfs_stdsync(vfsp, waitfor); 153 if (error != 0) 154 return (error); 155 156 ZFS_ENTER(zfsvfs); 157 dp = dmu_objset_pool(zfsvfs->z_os); 158 159 /* 160 * If the system is shutting down, then skip any 161 * filesystems which may exist on a suspended pool. 162 */ 163 if (sys_shutdown && spa_suspended(dp->dp_spa)) { 164 ZFS_EXIT(zfsvfs); 165 return (0); 166 } 167 168 if (zfsvfs->z_log != NULL) 169 zil_commit(zfsvfs->z_log, 0); 170 171 ZFS_EXIT(zfsvfs); 172 } else { 173 /* 174 * Sync all ZFS filesystems. This is what happens when you 175 * run sync(1M). Unlike other filesystems, ZFS honors the 176 * request by waiting for all pools to commit all dirty data. 177 */ 178 spa_sync_allpools(); 179 } 180 181 return (0); 182} 183 184#ifndef __FreeBSD_kernel__ 185static int 186zfs_create_unique_device(dev_t *dev) 187{ 188 major_t new_major; 189 190 do { 191 ASSERT3U(zfs_minor, <=, MAXMIN32); 192 minor_t start = zfs_minor; 193 do { 194 mutex_enter(&zfs_dev_mtx); 195 if (zfs_minor >= MAXMIN32) { 196 /* 197 * If we're still using the real major 198 * keep out of /dev/zfs and /dev/zvol minor 199 * number space. If we're using a getudev()'ed 200 * major number, we can use all of its minors. 201 */ 202 if (zfs_major == ddi_name_to_major(ZFS_DRIVER)) 203 zfs_minor = ZFS_MIN_MINOR; 204 else 205 zfs_minor = 0; 206 } else { 207 zfs_minor++; 208 } 209 *dev = makedevice(zfs_major, zfs_minor); 210 mutex_exit(&zfs_dev_mtx); 211 } while (vfs_devismounted(*dev) && zfs_minor != start); 212 if (zfs_minor == start) { 213 /* 214 * We are using all ~262,000 minor numbers for the 215 * current major number. Create a new major number. 216 */ 217 if ((new_major = getudev()) == (major_t)-1) { 218 cmn_err(CE_WARN, 219 "zfs_mount: Can't get unique major " 220 "device number."); 221 return (-1); 222 } 223 mutex_enter(&zfs_dev_mtx); 224 zfs_major = new_major; 225 zfs_minor = 0; 226 227 mutex_exit(&zfs_dev_mtx); 228 } else { 229 break; 230 } 231 /* CONSTANTCONDITION */ 232 } while (1); 233 234 return (0); 235} 236#endif /* !__FreeBSD_kernel__ */ 237 238static void 239atime_changed_cb(void *arg, uint64_t newval) 240{ 241 zfsvfs_t *zfsvfs = arg; 242 243 if (newval == TRUE) { 244 zfsvfs->z_atime = TRUE; 245 zfsvfs->z_vfs->vfs_flag &= ~MNT_NOATIME; 246 vfs_clearmntopt(zfsvfs->z_vfs, MNTOPT_NOATIME); 247 vfs_setmntopt(zfsvfs->z_vfs, MNTOPT_ATIME, NULL, 0); 248 } else { 249 zfsvfs->z_atime = FALSE; 250 zfsvfs->z_vfs->vfs_flag |= MNT_NOATIME; 251 vfs_clearmntopt(zfsvfs->z_vfs, MNTOPT_ATIME); 252 vfs_setmntopt(zfsvfs->z_vfs, MNTOPT_NOATIME, NULL, 0); 253 } 254} 255 256static void 257xattr_changed_cb(void *arg, uint64_t newval) 258{ 259 zfsvfs_t *zfsvfs = arg; 260 261 if (newval == TRUE) { 262 /* XXX locking on vfs_flag? */ 263#ifdef TODO 264 zfsvfs->z_vfs->vfs_flag |= VFS_XATTR; 265#endif 266 vfs_clearmntopt(zfsvfs->z_vfs, MNTOPT_NOXATTR); 267 vfs_setmntopt(zfsvfs->z_vfs, MNTOPT_XATTR, NULL, 0); 268 } else { 269 /* XXX locking on vfs_flag? */ 270#ifdef TODO 271 zfsvfs->z_vfs->vfs_flag &= ~VFS_XATTR; 272#endif 273 vfs_clearmntopt(zfsvfs->z_vfs, MNTOPT_XATTR); 274 vfs_setmntopt(zfsvfs->z_vfs, MNTOPT_NOXATTR, NULL, 0); 275 } 276} 277 278static void 279blksz_changed_cb(void *arg, uint64_t newval) 280{ 281 zfsvfs_t *zfsvfs = arg; 282 ASSERT3U(newval, <=, spa_maxblocksize(dmu_objset_spa(zfsvfs->z_os))); 283 ASSERT3U(newval, >=, SPA_MINBLOCKSIZE); 284 ASSERT(ISP2(newval)); 285 286 zfsvfs->z_max_blksz = newval; 287 zfsvfs->z_vfs->mnt_stat.f_iosize = newval; 288} 289 290static void 291readonly_changed_cb(void *arg, uint64_t newval) 292{ 293 zfsvfs_t *zfsvfs = arg; 294 295 if (newval) { 296 /* XXX locking on vfs_flag? */ 297 zfsvfs->z_vfs->vfs_flag |= VFS_RDONLY; 298 vfs_clearmntopt(zfsvfs->z_vfs, MNTOPT_RW); 299 vfs_setmntopt(zfsvfs->z_vfs, MNTOPT_RO, NULL, 0); 300 } else { 301 /* XXX locking on vfs_flag? */ 302 zfsvfs->z_vfs->vfs_flag &= ~VFS_RDONLY; 303 vfs_clearmntopt(zfsvfs->z_vfs, MNTOPT_RO); 304 vfs_setmntopt(zfsvfs->z_vfs, MNTOPT_RW, NULL, 0); 305 } 306} 307 308static void 309setuid_changed_cb(void *arg, uint64_t newval) 310{ 311 zfsvfs_t *zfsvfs = arg; 312 313 if (newval == FALSE) { 314 zfsvfs->z_vfs->vfs_flag |= VFS_NOSETUID; 315 vfs_clearmntopt(zfsvfs->z_vfs, MNTOPT_SETUID); 316 vfs_setmntopt(zfsvfs->z_vfs, MNTOPT_NOSETUID, NULL, 0); 317 } else { 318 zfsvfs->z_vfs->vfs_flag &= ~VFS_NOSETUID; 319 vfs_clearmntopt(zfsvfs->z_vfs, MNTOPT_NOSETUID); 320 vfs_setmntopt(zfsvfs->z_vfs, MNTOPT_SETUID, NULL, 0); 321 } 322} 323 324static void 325exec_changed_cb(void *arg, uint64_t newval) 326{ 327 zfsvfs_t *zfsvfs = arg; 328 329 if (newval == FALSE) { 330 zfsvfs->z_vfs->vfs_flag |= VFS_NOEXEC; 331 vfs_clearmntopt(zfsvfs->z_vfs, MNTOPT_EXEC); 332 vfs_setmntopt(zfsvfs->z_vfs, MNTOPT_NOEXEC, NULL, 0); 333 } else { 334 zfsvfs->z_vfs->vfs_flag &= ~VFS_NOEXEC; 335 vfs_clearmntopt(zfsvfs->z_vfs, MNTOPT_NOEXEC); 336 vfs_setmntopt(zfsvfs->z_vfs, MNTOPT_EXEC, NULL, 0); 337 } 338} 339 340/* 341 * The nbmand mount option can be changed at mount time. 342 * We can't allow it to be toggled on live file systems or incorrect 343 * behavior may be seen from cifs clients 344 * 345 * This property isn't registered via dsl_prop_register(), but this callback 346 * will be called when a file system is first mounted 347 */ 348static void 349nbmand_changed_cb(void *arg, uint64_t newval) 350{ 351 zfsvfs_t *zfsvfs = arg; 352 if (newval == FALSE) { 353 vfs_clearmntopt(zfsvfs->z_vfs, MNTOPT_NBMAND); 354 vfs_setmntopt(zfsvfs->z_vfs, MNTOPT_NONBMAND, NULL, 0); 355 } else { 356 vfs_clearmntopt(zfsvfs->z_vfs, MNTOPT_NONBMAND); 357 vfs_setmntopt(zfsvfs->z_vfs, MNTOPT_NBMAND, NULL, 0); 358 } 359} 360 361static void 362snapdir_changed_cb(void *arg, uint64_t newval) 363{ 364 zfsvfs_t *zfsvfs = arg; 365 366 zfsvfs->z_show_ctldir = newval; 367} 368 369static void 370vscan_changed_cb(void *arg, uint64_t newval) 371{ 372 zfsvfs_t *zfsvfs = arg; 373 374 zfsvfs->z_vscan = newval; 375} 376 377static void 378acl_mode_changed_cb(void *arg, uint64_t newval) 379{ 380 zfsvfs_t *zfsvfs = arg; 381 382 zfsvfs->z_acl_mode = newval; 383} 384 385static void 386acl_inherit_changed_cb(void *arg, uint64_t newval) 387{ 388 zfsvfs_t *zfsvfs = arg; 389 390 zfsvfs->z_acl_inherit = newval; 391} 392 393static int 394zfs_register_callbacks(vfs_t *vfsp) 395{ 396 struct dsl_dataset *ds = NULL; 397 objset_t *os = NULL; 398 zfsvfs_t *zfsvfs = NULL; 399 uint64_t nbmand; 400 boolean_t readonly = B_FALSE; 401 boolean_t do_readonly = B_FALSE; 402 boolean_t setuid = B_FALSE; 403 boolean_t do_setuid = B_FALSE; 404 boolean_t exec = B_FALSE; 405 boolean_t do_exec = B_FALSE; 406#ifdef illumos 407 boolean_t devices = B_FALSE; 408 boolean_t do_devices = B_FALSE; 409#endif 410 boolean_t xattr = B_FALSE; 411 boolean_t do_xattr = B_FALSE; 412 boolean_t atime = B_FALSE; 413 boolean_t do_atime = B_FALSE; 414 int error = 0; 415 416 ASSERT(vfsp); 417 zfsvfs = vfsp->vfs_data; 418 ASSERT(zfsvfs); 419 os = zfsvfs->z_os; 420 421 /* 422 * This function can be called for a snapshot when we update snapshot's 423 * mount point, which isn't really supported. 424 */ 425 if (dmu_objset_is_snapshot(os)) 426 return (EOPNOTSUPP); 427 428 /* 429 * The act of registering our callbacks will destroy any mount 430 * options we may have. In order to enable temporary overrides 431 * of mount options, we stash away the current values and 432 * restore them after we register the callbacks. 433 */ 434 if (vfs_optionisset(vfsp, MNTOPT_RO, NULL) || 435 !spa_writeable(dmu_objset_spa(os))) { 436 readonly = B_TRUE; 437 do_readonly = B_TRUE; 438 } else if (vfs_optionisset(vfsp, MNTOPT_RW, NULL)) { 439 readonly = B_FALSE; 440 do_readonly = B_TRUE; 441 } 442 if (vfs_optionisset(vfsp, MNTOPT_NOSUID, NULL)) { 443 setuid = B_FALSE; 444 do_setuid = B_TRUE; 445 } else { 446 if (vfs_optionisset(vfsp, MNTOPT_NOSETUID, NULL)) { 447 setuid = B_FALSE; 448 do_setuid = B_TRUE; 449 } else if (vfs_optionisset(vfsp, MNTOPT_SETUID, NULL)) { 450 setuid = B_TRUE; 451 do_setuid = B_TRUE; 452 } 453 } 454 if (vfs_optionisset(vfsp, MNTOPT_NOEXEC, NULL)) { 455 exec = B_FALSE; 456 do_exec = B_TRUE; 457 } else if (vfs_optionisset(vfsp, MNTOPT_EXEC, NULL)) { 458 exec = B_TRUE; 459 do_exec = B_TRUE; 460 } 461 if (vfs_optionisset(vfsp, MNTOPT_NOXATTR, NULL)) { 462 xattr = B_FALSE; 463 do_xattr = B_TRUE; 464 } else if (vfs_optionisset(vfsp, MNTOPT_XATTR, NULL)) { 465 xattr = B_TRUE; 466 do_xattr = B_TRUE; 467 } 468 if (vfs_optionisset(vfsp, MNTOPT_NOATIME, NULL)) { 469 atime = B_FALSE; 470 do_atime = B_TRUE; 471 } else if (vfs_optionisset(vfsp, MNTOPT_ATIME, NULL)) { 472 atime = B_TRUE; 473 do_atime = B_TRUE; 474 } 475 476 /* 477 * We need to enter pool configuration here, so that we can use 478 * dsl_prop_get_int_ds() to handle the special nbmand property below. 479 * dsl_prop_get_integer() can not be used, because it has to acquire 480 * spa_namespace_lock and we can not do that because we already hold 481 * z_teardown_lock. The problem is that spa_config_sync() is called 482 * with spa_namespace_lock held and the function calls ZFS vnode 483 * operations to write the cache file and thus z_teardown_lock is 484 * acquired after spa_namespace_lock. 485 */ 486 ds = dmu_objset_ds(os); 487 dsl_pool_config_enter(dmu_objset_pool(os), FTAG); 488 489 /* 490 * nbmand is a special property. It can only be changed at 491 * mount time. 492 * 493 * This is weird, but it is documented to only be changeable 494 * at mount time. 495 */ 496 if (vfs_optionisset(vfsp, MNTOPT_NONBMAND, NULL)) { 497 nbmand = B_FALSE; 498 } else if (vfs_optionisset(vfsp, MNTOPT_NBMAND, NULL)) { 499 nbmand = B_TRUE; 500 } else if (error = dsl_prop_get_int_ds(ds, "nbmand", &nbmand) != 0) { 501 dsl_pool_config_exit(dmu_objset_pool(os), FTAG); 502 return (error); 503 } 504 505 /* 506 * Register property callbacks. 507 * 508 * It would probably be fine to just check for i/o error from 509 * the first prop_register(), but I guess I like to go 510 * overboard... 511 */ 512 error = dsl_prop_register(ds, 513 zfs_prop_to_name(ZFS_PROP_ATIME), atime_changed_cb, zfsvfs); 514 error = error ? error : dsl_prop_register(ds, 515 zfs_prop_to_name(ZFS_PROP_XATTR), xattr_changed_cb, zfsvfs); 516 error = error ? error : dsl_prop_register(ds, 517 zfs_prop_to_name(ZFS_PROP_RECORDSIZE), blksz_changed_cb, zfsvfs); 518 error = error ? error : dsl_prop_register(ds, 519 zfs_prop_to_name(ZFS_PROP_READONLY), readonly_changed_cb, zfsvfs); 520#ifdef illumos 521 error = error ? error : dsl_prop_register(ds, 522 zfs_prop_to_name(ZFS_PROP_DEVICES), devices_changed_cb, zfsvfs); 523#endif 524 error = error ? error : dsl_prop_register(ds, 525 zfs_prop_to_name(ZFS_PROP_SETUID), setuid_changed_cb, zfsvfs); 526 error = error ? error : dsl_prop_register(ds, 527 zfs_prop_to_name(ZFS_PROP_EXEC), exec_changed_cb, zfsvfs); 528 error = error ? error : dsl_prop_register(ds, 529 zfs_prop_to_name(ZFS_PROP_SNAPDIR), snapdir_changed_cb, zfsvfs); 530 error = error ? error : dsl_prop_register(ds, 531 zfs_prop_to_name(ZFS_PROP_ACLMODE), acl_mode_changed_cb, zfsvfs); 532 error = error ? error : dsl_prop_register(ds, 533 zfs_prop_to_name(ZFS_PROP_ACLINHERIT), acl_inherit_changed_cb, 534 zfsvfs); 535 error = error ? error : dsl_prop_register(ds, 536 zfs_prop_to_name(ZFS_PROP_VSCAN), vscan_changed_cb, zfsvfs); 537 dsl_pool_config_exit(dmu_objset_pool(os), FTAG); 538 if (error) 539 goto unregister; 540 541 /* 542 * Invoke our callbacks to restore temporary mount options. 543 */ 544 if (do_readonly) 545 readonly_changed_cb(zfsvfs, readonly); 546 if (do_setuid) 547 setuid_changed_cb(zfsvfs, setuid); 548 if (do_exec) 549 exec_changed_cb(zfsvfs, exec); 550 if (do_xattr) 551 xattr_changed_cb(zfsvfs, xattr); 552 if (do_atime) 553 atime_changed_cb(zfsvfs, atime); 554 555 nbmand_changed_cb(zfsvfs, nbmand); 556 557 return (0); 558 559unregister: 560 dsl_prop_unregister_all(ds, zfsvfs); 561 return (error); 562} 563 564static int 565zfs_space_delta_cb(dmu_object_type_t bonustype, void *data, 566 uint64_t *userp, uint64_t *groupp) 567{ 568 /* 569 * Is it a valid type of object to track? 570 */ 571 if (bonustype != DMU_OT_ZNODE && bonustype != DMU_OT_SA) 572 return (SET_ERROR(ENOENT)); 573 574 /* 575 * If we have a NULL data pointer 576 * then assume the id's aren't changing and 577 * return EEXIST to the dmu to let it know to 578 * use the same ids 579 */ 580 if (data == NULL) 581 return (SET_ERROR(EEXIST)); 582 583 if (bonustype == DMU_OT_ZNODE) { 584 znode_phys_t *znp = data; 585 *userp = znp->zp_uid; 586 *groupp = znp->zp_gid; 587 } else { 588 int hdrsize; 589 sa_hdr_phys_t *sap = data; 590 sa_hdr_phys_t sa = *sap; 591 boolean_t swap = B_FALSE; 592 593 ASSERT(bonustype == DMU_OT_SA); 594 595 if (sa.sa_magic == 0) { 596 /* 597 * This should only happen for newly created 598 * files that haven't had the znode data filled 599 * in yet. 600 */ 601 *userp = 0; 602 *groupp = 0; 603 return (0); 604 } 605 if (sa.sa_magic == BSWAP_32(SA_MAGIC)) { 606 sa.sa_magic = SA_MAGIC; 607 sa.sa_layout_info = BSWAP_16(sa.sa_layout_info); 608 swap = B_TRUE; 609 } else { 610 VERIFY3U(sa.sa_magic, ==, SA_MAGIC); 611 } 612 613 hdrsize = sa_hdrsize(&sa); 614 VERIFY3U(hdrsize, >=, sizeof (sa_hdr_phys_t)); 615 *userp = *((uint64_t *)((uintptr_t)data + hdrsize + 616 SA_UID_OFFSET)); 617 *groupp = *((uint64_t *)((uintptr_t)data + hdrsize + 618 SA_GID_OFFSET)); 619 if (swap) { 620 *userp = BSWAP_64(*userp); 621 *groupp = BSWAP_64(*groupp); 622 } 623 } 624 return (0); 625} 626 627static void 628fuidstr_to_sid(zfsvfs_t *zfsvfs, const char *fuidstr, 629 char *domainbuf, int buflen, uid_t *ridp) 630{ 631 uint64_t fuid; 632 const char *domain; 633 634 fuid = strtonum(fuidstr, NULL); 635 636 domain = zfs_fuid_find_by_idx(zfsvfs, FUID_INDEX(fuid)); 637 if (domain) 638 (void) strlcpy(domainbuf, domain, buflen); 639 else 640 domainbuf[0] = '\0'; 641 *ridp = FUID_RID(fuid); 642} 643 644static uint64_t 645zfs_userquota_prop_to_obj(zfsvfs_t *zfsvfs, zfs_userquota_prop_t type) 646{ 647 switch (type) { 648 case ZFS_PROP_USERUSED: 649 return (DMU_USERUSED_OBJECT); 650 case ZFS_PROP_GROUPUSED: 651 return (DMU_GROUPUSED_OBJECT); 652 case ZFS_PROP_USERQUOTA: 653 return (zfsvfs->z_userquota_obj); 654 case ZFS_PROP_GROUPQUOTA: 655 return (zfsvfs->z_groupquota_obj); 656 } 657 return (0); 658} 659 660int 661zfs_userspace_many(zfsvfs_t *zfsvfs, zfs_userquota_prop_t type, 662 uint64_t *cookiep, void *vbuf, uint64_t *bufsizep) 663{ 664 int error; 665 zap_cursor_t zc; 666 zap_attribute_t za; 667 zfs_useracct_t *buf = vbuf; 668 uint64_t obj; 669 670 if (!dmu_objset_userspace_present(zfsvfs->z_os)) 671 return (SET_ERROR(ENOTSUP)); 672 673 obj = zfs_userquota_prop_to_obj(zfsvfs, type); 674 if (obj == 0) { 675 *bufsizep = 0; 676 return (0); 677 } 678 679 for (zap_cursor_init_serialized(&zc, zfsvfs->z_os, obj, *cookiep); 680 (error = zap_cursor_retrieve(&zc, &za)) == 0; 681 zap_cursor_advance(&zc)) { 682 if ((uintptr_t)buf - (uintptr_t)vbuf + sizeof (zfs_useracct_t) > 683 *bufsizep) 684 break; 685 686 fuidstr_to_sid(zfsvfs, za.za_name, 687 buf->zu_domain, sizeof (buf->zu_domain), &buf->zu_rid); 688 689 buf->zu_space = za.za_first_integer; 690 buf++; 691 } 692 if (error == ENOENT) 693 error = 0; 694 695 ASSERT3U((uintptr_t)buf - (uintptr_t)vbuf, <=, *bufsizep); 696 *bufsizep = (uintptr_t)buf - (uintptr_t)vbuf; 697 *cookiep = zap_cursor_serialize(&zc); 698 zap_cursor_fini(&zc); 699 return (error); 700} 701 702/* 703 * buf must be big enough (eg, 32 bytes) 704 */ 705static int 706id_to_fuidstr(zfsvfs_t *zfsvfs, const char *domain, uid_t rid, 707 char *buf, boolean_t addok) 708{ 709 uint64_t fuid; 710 int domainid = 0; 711 712 if (domain && domain[0]) { 713 domainid = zfs_fuid_find_by_domain(zfsvfs, domain, NULL, addok); 714 if (domainid == -1) 715 return (SET_ERROR(ENOENT)); 716 } 717 fuid = FUID_ENCODE(domainid, rid); 718 (void) sprintf(buf, "%llx", (longlong_t)fuid); 719 return (0); 720} 721 722int 723zfs_userspace_one(zfsvfs_t *zfsvfs, zfs_userquota_prop_t type, 724 const char *domain, uint64_t rid, uint64_t *valp) 725{ 726 char buf[32]; 727 int err; 728 uint64_t obj; 729 730 *valp = 0; 731 732 if (!dmu_objset_userspace_present(zfsvfs->z_os)) 733 return (SET_ERROR(ENOTSUP)); 734 735 obj = zfs_userquota_prop_to_obj(zfsvfs, type); 736 if (obj == 0) 737 return (0); 738 739 err = id_to_fuidstr(zfsvfs, domain, rid, buf, B_FALSE); 740 if (err) 741 return (err); 742 743 err = zap_lookup(zfsvfs->z_os, obj, buf, 8, 1, valp); 744 if (err == ENOENT) 745 err = 0; 746 return (err); 747} 748 749int 750zfs_set_userquota(zfsvfs_t *zfsvfs, zfs_userquota_prop_t type, 751 const char *domain, uint64_t rid, uint64_t quota) 752{ 753 char buf[32]; 754 int err; 755 dmu_tx_t *tx; 756 uint64_t *objp; 757 boolean_t fuid_dirtied; 758 759 if (type != ZFS_PROP_USERQUOTA && type != ZFS_PROP_GROUPQUOTA) 760 return (SET_ERROR(EINVAL)); 761 762 if (zfsvfs->z_version < ZPL_VERSION_USERSPACE) 763 return (SET_ERROR(ENOTSUP)); 764 765 objp = (type == ZFS_PROP_USERQUOTA) ? &zfsvfs->z_userquota_obj : 766 &zfsvfs->z_groupquota_obj; 767 768 err = id_to_fuidstr(zfsvfs, domain, rid, buf, B_TRUE); 769 if (err) 770 return (err); 771 fuid_dirtied = zfsvfs->z_fuid_dirty; 772 773 tx = dmu_tx_create(zfsvfs->z_os); 774 dmu_tx_hold_zap(tx, *objp ? *objp : DMU_NEW_OBJECT, B_TRUE, NULL); 775 if (*objp == 0) { 776 dmu_tx_hold_zap(tx, MASTER_NODE_OBJ, B_TRUE, 777 zfs_userquota_prop_prefixes[type]); 778 } 779 if (fuid_dirtied) 780 zfs_fuid_txhold(zfsvfs, tx); 781 err = dmu_tx_assign(tx, TXG_WAIT); 782 if (err) { 783 dmu_tx_abort(tx); 784 return (err); 785 } 786 787 mutex_enter(&zfsvfs->z_lock); 788 if (*objp == 0) { 789 *objp = zap_create(zfsvfs->z_os, DMU_OT_USERGROUP_QUOTA, 790 DMU_OT_NONE, 0, tx); 791 VERIFY(0 == zap_add(zfsvfs->z_os, MASTER_NODE_OBJ, 792 zfs_userquota_prop_prefixes[type], 8, 1, objp, tx)); 793 } 794 mutex_exit(&zfsvfs->z_lock); 795 796 if (quota == 0) { 797 err = zap_remove(zfsvfs->z_os, *objp, buf, tx); 798 if (err == ENOENT) 799 err = 0; 800 } else { 801 err = zap_update(zfsvfs->z_os, *objp, buf, 8, 1, "a, tx); 802 } 803 ASSERT(err == 0); 804 if (fuid_dirtied) 805 zfs_fuid_sync(zfsvfs, tx); 806 dmu_tx_commit(tx); 807 return (err); 808} 809 810boolean_t 811zfs_fuid_overquota(zfsvfs_t *zfsvfs, boolean_t isgroup, uint64_t fuid) 812{ 813 char buf[32]; 814 uint64_t used, quota, usedobj, quotaobj; 815 int err; 816 817 usedobj = isgroup ? DMU_GROUPUSED_OBJECT : DMU_USERUSED_OBJECT; 818 quotaobj = isgroup ? zfsvfs->z_groupquota_obj : zfsvfs->z_userquota_obj; 819 820 if (quotaobj == 0 || zfsvfs->z_replay) 821 return (B_FALSE); 822 823 (void) sprintf(buf, "%llx", (longlong_t)fuid); 824 err = zap_lookup(zfsvfs->z_os, quotaobj, buf, 8, 1, "a); 825 if (err != 0) 826 return (B_FALSE); 827 828 err = zap_lookup(zfsvfs->z_os, usedobj, buf, 8, 1, &used); 829 if (err != 0) 830 return (B_FALSE); 831 return (used >= quota); 832} 833 834boolean_t 835zfs_owner_overquota(zfsvfs_t *zfsvfs, znode_t *zp, boolean_t isgroup) 836{ 837 uint64_t fuid; 838 uint64_t quotaobj; 839 840 quotaobj = isgroup ? zfsvfs->z_groupquota_obj : zfsvfs->z_userquota_obj; 841 842 fuid = isgroup ? zp->z_gid : zp->z_uid; 843 844 if (quotaobj == 0 || zfsvfs->z_replay) 845 return (B_FALSE); 846 847 return (zfs_fuid_overquota(zfsvfs, isgroup, fuid)); 848} 849 850int 851zfsvfs_create(const char *osname, zfsvfs_t **zfvp) 852{ 853 objset_t *os; 854 zfsvfs_t *zfsvfs; 855 uint64_t zval; 856 int i, error; 857 uint64_t sa_obj; 858 859 /* 860 * XXX: Fix struct statfs so this isn't necessary! 861 * 862 * The 'osname' is used as the filesystem's special node, which means 863 * it must fit in statfs.f_mntfromname, or else it can't be 864 * enumerated, so libzfs_mnttab_find() returns NULL, which causes 865 * 'zfs unmount' to think it's not mounted when it is. 866 */ 867 if (strlen(osname) >= MNAMELEN) 868 return (SET_ERROR(ENAMETOOLONG)); 869 870 zfsvfs = kmem_zalloc(sizeof (zfsvfs_t), KM_SLEEP); 871 872 /* 873 * We claim to always be readonly so we can open snapshots; 874 * other ZPL code will prevent us from writing to snapshots. 875 */ 876 error = dmu_objset_own(osname, DMU_OST_ZFS, B_TRUE, zfsvfs, &os); 877 if (error) { 878 kmem_free(zfsvfs, sizeof (zfsvfs_t)); 879 return (error); 880 } 881 882 /* 883 * Initialize the zfs-specific filesystem structure. 884 * Should probably make this a kmem cache, shuffle fields, 885 * and just bzero up to z_hold_mtx[]. 886 */ 887 zfsvfs->z_vfs = NULL; 888 zfsvfs->z_parent = zfsvfs; 889 zfsvfs->z_max_blksz = SPA_OLD_MAXBLOCKSIZE; 890 zfsvfs->z_show_ctldir = ZFS_SNAPDIR_VISIBLE; 891 zfsvfs->z_os = os; 892 893 error = zfs_get_zplprop(os, ZFS_PROP_VERSION, &zfsvfs->z_version); 894 if (error) { 895 goto out; 896 } else if (zfsvfs->z_version > 897 zfs_zpl_version_map(spa_version(dmu_objset_spa(os)))) { 898 (void) printf("Can't mount a version %lld file system " 899 "on a version %lld pool\n. Pool must be upgraded to mount " 900 "this file system.", (u_longlong_t)zfsvfs->z_version, 901 (u_longlong_t)spa_version(dmu_objset_spa(os))); 902 error = SET_ERROR(ENOTSUP); 903 goto out; 904 } 905 if ((error = zfs_get_zplprop(os, ZFS_PROP_NORMALIZE, &zval)) != 0) 906 goto out; 907 zfsvfs->z_norm = (int)zval; 908 909 if ((error = zfs_get_zplprop(os, ZFS_PROP_UTF8ONLY, &zval)) != 0) 910 goto out; 911 zfsvfs->z_utf8 = (zval != 0); 912 913 if ((error = zfs_get_zplprop(os, ZFS_PROP_CASE, &zval)) != 0) 914 goto out; 915 zfsvfs->z_case = (uint_t)zval; 916 917 /* 918 * Fold case on file systems that are always or sometimes case 919 * insensitive. 920 */ 921 if (zfsvfs->z_case == ZFS_CASE_INSENSITIVE || 922 zfsvfs->z_case == ZFS_CASE_MIXED) 923 zfsvfs->z_norm |= U8_TEXTPREP_TOUPPER; 924 925 zfsvfs->z_use_fuids = USE_FUIDS(zfsvfs->z_version, zfsvfs->z_os); 926 zfsvfs->z_use_sa = USE_SA(zfsvfs->z_version, zfsvfs->z_os); 927 928 if (zfsvfs->z_use_sa) { 929 /* should either have both of these objects or none */ 930 error = zap_lookup(os, MASTER_NODE_OBJ, ZFS_SA_ATTRS, 8, 1, 931 &sa_obj); 932 if (error) 933 goto out; 934 } else { 935 /* 936 * Pre SA versions file systems should never touch 937 * either the attribute registration or layout objects. 938 */ 939 sa_obj = 0; 940 } 941 942 error = sa_setup(os, sa_obj, zfs_attr_table, ZPL_END, 943 &zfsvfs->z_attr_table); 944 if (error) 945 goto out; 946 947 if (zfsvfs->z_version >= ZPL_VERSION_SA) 948 sa_register_update_callback(os, zfs_sa_upgrade); 949 950 error = zap_lookup(os, MASTER_NODE_OBJ, ZFS_ROOT_OBJ, 8, 1, 951 &zfsvfs->z_root); 952 if (error) 953 goto out; 954 ASSERT(zfsvfs->z_root != 0); 955 956 error = zap_lookup(os, MASTER_NODE_OBJ, ZFS_UNLINKED_SET, 8, 1, 957 &zfsvfs->z_unlinkedobj); 958 if (error) 959 goto out; 960 961 error = zap_lookup(os, MASTER_NODE_OBJ, 962 zfs_userquota_prop_prefixes[ZFS_PROP_USERQUOTA], 963 8, 1, &zfsvfs->z_userquota_obj); 964 if (error && error != ENOENT) 965 goto out; 966 967 error = zap_lookup(os, MASTER_NODE_OBJ, 968 zfs_userquota_prop_prefixes[ZFS_PROP_GROUPQUOTA], 969 8, 1, &zfsvfs->z_groupquota_obj); 970 if (error && error != ENOENT) 971 goto out; 972 973 error = zap_lookup(os, MASTER_NODE_OBJ, ZFS_FUID_TABLES, 8, 1, 974 &zfsvfs->z_fuid_obj); 975 if (error && error != ENOENT) 976 goto out; 977 978 error = zap_lookup(os, MASTER_NODE_OBJ, ZFS_SHARES_DIR, 8, 1, 979 &zfsvfs->z_shares_dir); 980 if (error && error != ENOENT) 981 goto out; 982 983 mutex_init(&zfsvfs->z_znodes_lock, NULL, MUTEX_DEFAULT, NULL); 984 mutex_init(&zfsvfs->z_lock, NULL, MUTEX_DEFAULT, NULL); 985 list_create(&zfsvfs->z_all_znodes, sizeof (znode_t), 986 offsetof(znode_t, z_link_node)); 987 rrm_init(&zfsvfs->z_teardown_lock, B_FALSE); 988 rw_init(&zfsvfs->z_teardown_inactive_lock, NULL, RW_DEFAULT, NULL); 989 rw_init(&zfsvfs->z_fuid_lock, NULL, RW_DEFAULT, NULL); 990 for (i = 0; i != ZFS_OBJ_MTX_SZ; i++) 991 mutex_init(&zfsvfs->z_hold_mtx[i], NULL, MUTEX_DEFAULT, NULL); 992 993 *zfvp = zfsvfs; 994 return (0); 995 996out: 997 dmu_objset_disown(os, zfsvfs); 998 *zfvp = NULL; 999 kmem_free(zfsvfs, sizeof (zfsvfs_t)); 1000 return (error); 1001} 1002 1003static int 1004zfsvfs_setup(zfsvfs_t *zfsvfs, boolean_t mounting) 1005{ 1006 int error; 1007 1008 error = zfs_register_callbacks(zfsvfs->z_vfs); 1009 if (error) 1010 return (error); 1011 1012 /* 1013 * Set the objset user_ptr to track its zfsvfs. 1014 */ 1015 mutex_enter(&zfsvfs->z_os->os_user_ptr_lock); 1016 dmu_objset_set_user(zfsvfs->z_os, zfsvfs); 1017 mutex_exit(&zfsvfs->z_os->os_user_ptr_lock); 1018 1019 zfsvfs->z_log = zil_open(zfsvfs->z_os, zfs_get_data); 1020 1021 /* 1022 * If we are not mounting (ie: online recv), then we don't 1023 * have to worry about replaying the log as we blocked all 1024 * operations out since we closed the ZIL. 1025 */ 1026 if (mounting) { 1027 boolean_t readonly; 1028 1029 /* 1030 * During replay we remove the read only flag to 1031 * allow replays to succeed. 1032 */ 1033 readonly = zfsvfs->z_vfs->vfs_flag & VFS_RDONLY; 1034 if (readonly != 0) 1035 zfsvfs->z_vfs->vfs_flag &= ~VFS_RDONLY; 1036 else 1037 zfs_unlinked_drain(zfsvfs); 1038 1039 /* 1040 * Parse and replay the intent log. 1041 * 1042 * Because of ziltest, this must be done after 1043 * zfs_unlinked_drain(). (Further note: ziltest 1044 * doesn't use readonly mounts, where 1045 * zfs_unlinked_drain() isn't called.) This is because 1046 * ziltest causes spa_sync() to think it's committed, 1047 * but actually it is not, so the intent log contains 1048 * many txg's worth of changes. 1049 * 1050 * In particular, if object N is in the unlinked set in 1051 * the last txg to actually sync, then it could be 1052 * actually freed in a later txg and then reallocated 1053 * in a yet later txg. This would write a "create 1054 * object N" record to the intent log. Normally, this 1055 * would be fine because the spa_sync() would have 1056 * written out the fact that object N is free, before 1057 * we could write the "create object N" intent log 1058 * record. 1059 * 1060 * But when we are in ziltest mode, we advance the "open 1061 * txg" without actually spa_sync()-ing the changes to 1062 * disk. So we would see that object N is still 1063 * allocated and in the unlinked set, and there is an 1064 * intent log record saying to allocate it. 1065 */ 1066 if (spa_writeable(dmu_objset_spa(zfsvfs->z_os))) { 1067 if (zil_replay_disable) { 1068 zil_destroy(zfsvfs->z_log, B_FALSE); 1069 } else { 1070 zfsvfs->z_replay = B_TRUE; 1071 zil_replay(zfsvfs->z_os, zfsvfs, 1072 zfs_replay_vector); 1073 zfsvfs->z_replay = B_FALSE; 1074 } 1075 } 1076 zfsvfs->z_vfs->vfs_flag |= readonly; /* restore readonly bit */ 1077 } 1078 1079 return (0); 1080} 1081 1082extern krwlock_t zfsvfs_lock; /* in zfs_znode.c */ 1083 1084void 1085zfsvfs_free(zfsvfs_t *zfsvfs) 1086{ 1087 int i; 1088 1089 /* 1090 * This is a barrier to prevent the filesystem from going away in 1091 * zfs_znode_move() until we can safely ensure that the filesystem is 1092 * not unmounted. We consider the filesystem valid before the barrier 1093 * and invalid after the barrier. 1094 */ 1095 rw_enter(&zfsvfs_lock, RW_READER); 1096 rw_exit(&zfsvfs_lock); 1097 1098 zfs_fuid_destroy(zfsvfs); 1099 1100 mutex_destroy(&zfsvfs->z_znodes_lock); 1101 mutex_destroy(&zfsvfs->z_lock); 1102 list_destroy(&zfsvfs->z_all_znodes); 1103 rrm_destroy(&zfsvfs->z_teardown_lock); 1104 rw_destroy(&zfsvfs->z_teardown_inactive_lock); 1105 rw_destroy(&zfsvfs->z_fuid_lock); 1106 for (i = 0; i != ZFS_OBJ_MTX_SZ; i++) 1107 mutex_destroy(&zfsvfs->z_hold_mtx[i]); 1108 kmem_free(zfsvfs, sizeof (zfsvfs_t)); 1109} 1110 1111static void 1112zfs_set_fuid_feature(zfsvfs_t *zfsvfs) 1113{ 1114 zfsvfs->z_use_fuids = USE_FUIDS(zfsvfs->z_version, zfsvfs->z_os); 1115 if (zfsvfs->z_vfs) { 1116 if (zfsvfs->z_use_fuids) { 1117 vfs_set_feature(zfsvfs->z_vfs, VFSFT_XVATTR); 1118 vfs_set_feature(zfsvfs->z_vfs, VFSFT_SYSATTR_VIEWS); 1119 vfs_set_feature(zfsvfs->z_vfs, VFSFT_ACEMASKONACCESS); 1120 vfs_set_feature(zfsvfs->z_vfs, VFSFT_ACLONCREATE); 1121 vfs_set_feature(zfsvfs->z_vfs, VFSFT_ACCESS_FILTER); 1122 vfs_set_feature(zfsvfs->z_vfs, VFSFT_REPARSE); 1123 } else { 1124 vfs_clear_feature(zfsvfs->z_vfs, VFSFT_XVATTR); 1125 vfs_clear_feature(zfsvfs->z_vfs, VFSFT_SYSATTR_VIEWS); 1126 vfs_clear_feature(zfsvfs->z_vfs, VFSFT_ACEMASKONACCESS); 1127 vfs_clear_feature(zfsvfs->z_vfs, VFSFT_ACLONCREATE); 1128 vfs_clear_feature(zfsvfs->z_vfs, VFSFT_ACCESS_FILTER); 1129 vfs_clear_feature(zfsvfs->z_vfs, VFSFT_REPARSE); 1130 } 1131 } 1132 zfsvfs->z_use_sa = USE_SA(zfsvfs->z_version, zfsvfs->z_os); 1133} 1134 1135static int 1136zfs_domount(vfs_t *vfsp, char *osname) 1137{ 1138 uint64_t recordsize, fsid_guid; 1139 int error = 0; 1140 zfsvfs_t *zfsvfs; 1141 vnode_t *vp; 1142 1143 ASSERT(vfsp); 1144 ASSERT(osname); 1145 1146 error = zfsvfs_create(osname, &zfsvfs); 1147 if (error) 1148 return (error); 1149 zfsvfs->z_vfs = vfsp; 1150 1151#ifdef illumos 1152 /* Initialize the generic filesystem structure. */ 1153 vfsp->vfs_bcount = 0; 1154 vfsp->vfs_data = NULL; 1155 1156 if (zfs_create_unique_device(&mount_dev) == -1) { 1157 error = SET_ERROR(ENODEV); 1158 goto out; 1159 } 1160 ASSERT(vfs_devismounted(mount_dev) == 0); 1161#endif 1162 1163 if (error = dsl_prop_get_integer(osname, "recordsize", &recordsize, 1164 NULL)) 1165 goto out; 1166 zfsvfs->z_vfs->vfs_bsize = SPA_MINBLOCKSIZE; 1167 zfsvfs->z_vfs->mnt_stat.f_iosize = recordsize; 1168 1169 vfsp->vfs_data = zfsvfs; 1170 vfsp->mnt_flag |= MNT_LOCAL; 1171 vfsp->mnt_kern_flag |= MNTK_LOOKUP_SHARED; 1172 vfsp->mnt_kern_flag |= MNTK_SHARED_WRITES; 1173 vfsp->mnt_kern_flag |= MNTK_EXTENDED_SHARED; 1174 1175 /* 1176 * The fsid is 64 bits, composed of an 8-bit fs type, which 1177 * separates our fsid from any other filesystem types, and a 1178 * 56-bit objset unique ID. The objset unique ID is unique to 1179 * all objsets open on this system, provided by unique_create(). 1180 * The 8-bit fs type must be put in the low bits of fsid[1] 1181 * because that's where other Solaris filesystems put it. 1182 */ 1183 fsid_guid = dmu_objset_fsid_guid(zfsvfs->z_os); 1184 ASSERT((fsid_guid & ~((1ULL<<56)-1)) == 0); 1185 vfsp->vfs_fsid.val[0] = fsid_guid; 1186 vfsp->vfs_fsid.val[1] = ((fsid_guid>>32) << 8) | 1187 vfsp->mnt_vfc->vfc_typenum & 0xFF; 1188 1189 /* 1190 * Set features for file system. 1191 */ 1192 zfs_set_fuid_feature(zfsvfs); 1193 if (zfsvfs->z_case == ZFS_CASE_INSENSITIVE) { 1194 vfs_set_feature(vfsp, VFSFT_DIRENTFLAGS); 1195 vfs_set_feature(vfsp, VFSFT_CASEINSENSITIVE); 1196 vfs_set_feature(vfsp, VFSFT_NOCASESENSITIVE); 1197 } else if (zfsvfs->z_case == ZFS_CASE_MIXED) { 1198 vfs_set_feature(vfsp, VFSFT_DIRENTFLAGS); 1199 vfs_set_feature(vfsp, VFSFT_CASEINSENSITIVE); 1200 } 1201 vfs_set_feature(vfsp, VFSFT_ZEROCOPY_SUPPORTED); 1202 1203 if (dmu_objset_is_snapshot(zfsvfs->z_os)) { 1204 uint64_t pval; 1205 1206 atime_changed_cb(zfsvfs, B_FALSE); 1207 readonly_changed_cb(zfsvfs, B_TRUE); 1208 if (error = dsl_prop_get_integer(osname, "xattr", &pval, NULL)) 1209 goto out; 1210 xattr_changed_cb(zfsvfs, pval); 1211 zfsvfs->z_issnap = B_TRUE; 1212 zfsvfs->z_os->os_sync = ZFS_SYNC_DISABLED; 1213 1214 mutex_enter(&zfsvfs->z_os->os_user_ptr_lock); 1215 dmu_objset_set_user(zfsvfs->z_os, zfsvfs); 1216 mutex_exit(&zfsvfs->z_os->os_user_ptr_lock); 1217 } else { 1218 error = zfsvfs_setup(zfsvfs, B_TRUE); 1219 } 1220 1221 vfs_mountedfrom(vfsp, osname); 1222 1223 if (!zfsvfs->z_issnap) 1224 zfsctl_create(zfsvfs); 1225out: 1226 if (error) { 1227 dmu_objset_disown(zfsvfs->z_os, zfsvfs); 1228 zfsvfs_free(zfsvfs); 1229 } else { 1230 atomic_inc_32(&zfs_active_fs_count); 1231 } 1232 1233 return (error); 1234} 1235 1236void 1237zfs_unregister_callbacks(zfsvfs_t *zfsvfs) 1238{ 1239 objset_t *os = zfsvfs->z_os; 1240 1241 if (!dmu_objset_is_snapshot(os)) 1242 dsl_prop_unregister_all(dmu_objset_ds(os), zfsvfs); 1243} 1244 1245#ifdef SECLABEL 1246/* 1247 * Convert a decimal digit string to a uint64_t integer. 1248 */ 1249static int 1250str_to_uint64(char *str, uint64_t *objnum) 1251{ 1252 uint64_t num = 0; 1253 1254 while (*str) { 1255 if (*str < '0' || *str > '9') 1256 return (SET_ERROR(EINVAL)); 1257 1258 num = num*10 + *str++ - '0'; 1259 } 1260 1261 *objnum = num; 1262 return (0); 1263} 1264 1265/* 1266 * The boot path passed from the boot loader is in the form of 1267 * "rootpool-name/root-filesystem-object-number'. Convert this 1268 * string to a dataset name: "rootpool-name/root-filesystem-name". 1269 */ 1270static int 1271zfs_parse_bootfs(char *bpath, char *outpath) 1272{ 1273 char *slashp; 1274 uint64_t objnum; 1275 int error; 1276 1277 if (*bpath == 0 || *bpath == '/') 1278 return (SET_ERROR(EINVAL)); 1279 1280 (void) strcpy(outpath, bpath); 1281 1282 slashp = strchr(bpath, '/'); 1283 1284 /* if no '/', just return the pool name */ 1285 if (slashp == NULL) { 1286 return (0); 1287 } 1288 1289 /* if not a number, just return the root dataset name */ 1290 if (str_to_uint64(slashp+1, &objnum)) { 1291 return (0); 1292 } 1293 1294 *slashp = '\0'; 1295 error = dsl_dsobj_to_dsname(bpath, objnum, outpath); 1296 *slashp = '/'; 1297 1298 return (error); 1299} 1300 1301/* 1302 * Check that the hex label string is appropriate for the dataset being 1303 * mounted into the global_zone proper. 1304 * 1305 * Return an error if the hex label string is not default or 1306 * admin_low/admin_high. For admin_low labels, the corresponding 1307 * dataset must be readonly. 1308 */ 1309int 1310zfs_check_global_label(const char *dsname, const char *hexsl) 1311{ 1312 if (strcasecmp(hexsl, ZFS_MLSLABEL_DEFAULT) == 0) 1313 return (0); 1314 if (strcasecmp(hexsl, ADMIN_HIGH) == 0) 1315 return (0); 1316 if (strcasecmp(hexsl, ADMIN_LOW) == 0) { 1317 /* must be readonly */ 1318 uint64_t rdonly; 1319 1320 if (dsl_prop_get_integer(dsname, 1321 zfs_prop_to_name(ZFS_PROP_READONLY), &rdonly, NULL)) 1322 return (SET_ERROR(EACCES)); 1323 return (rdonly ? 0 : EACCES); 1324 } 1325 return (SET_ERROR(EACCES)); 1326} 1327 1328/* 1329 * Determine whether the mount is allowed according to MAC check. 1330 * by comparing (where appropriate) label of the dataset against 1331 * the label of the zone being mounted into. If the dataset has 1332 * no label, create one. 1333 * 1334 * Returns 0 if access allowed, error otherwise (e.g. EACCES) 1335 */ 1336static int 1337zfs_mount_label_policy(vfs_t *vfsp, char *osname) 1338{ 1339 int error, retv; 1340 zone_t *mntzone = NULL; 1341 ts_label_t *mnt_tsl; 1342 bslabel_t *mnt_sl; 1343 bslabel_t ds_sl; 1344 char ds_hexsl[MAXNAMELEN]; 1345 1346 retv = EACCES; /* assume the worst */ 1347 1348 /* 1349 * Start by getting the dataset label if it exists. 1350 */ 1351 error = dsl_prop_get(osname, zfs_prop_to_name(ZFS_PROP_MLSLABEL), 1352 1, sizeof (ds_hexsl), &ds_hexsl, NULL); 1353 if (error) 1354 return (SET_ERROR(EACCES)); 1355 1356 /* 1357 * If labeling is NOT enabled, then disallow the mount of datasets 1358 * which have a non-default label already. No other label checks 1359 * are needed. 1360 */ 1361 if (!is_system_labeled()) { 1362 if (strcasecmp(ds_hexsl, ZFS_MLSLABEL_DEFAULT) == 0) 1363 return (0); 1364 return (SET_ERROR(EACCES)); 1365 } 1366 1367 /* 1368 * Get the label of the mountpoint. If mounting into the global 1369 * zone (i.e. mountpoint is not within an active zone and the 1370 * zoned property is off), the label must be default or 1371 * admin_low/admin_high only; no other checks are needed. 1372 */ 1373 mntzone = zone_find_by_any_path(refstr_value(vfsp->vfs_mntpt), B_FALSE); 1374 if (mntzone->zone_id == GLOBAL_ZONEID) { 1375 uint64_t zoned; 1376 1377 zone_rele(mntzone); 1378 1379 if (dsl_prop_get_integer(osname, 1380 zfs_prop_to_name(ZFS_PROP_ZONED), &zoned, NULL)) 1381 return (SET_ERROR(EACCES)); 1382 if (!zoned) 1383 return (zfs_check_global_label(osname, ds_hexsl)); 1384 else 1385 /* 1386 * This is the case of a zone dataset being mounted 1387 * initially, before the zone has been fully created; 1388 * allow this mount into global zone. 1389 */ 1390 return (0); 1391 } 1392 1393 mnt_tsl = mntzone->zone_slabel; 1394 ASSERT(mnt_tsl != NULL); 1395 label_hold(mnt_tsl); 1396 mnt_sl = label2bslabel(mnt_tsl); 1397 1398 if (strcasecmp(ds_hexsl, ZFS_MLSLABEL_DEFAULT) == 0) { 1399 /* 1400 * The dataset doesn't have a real label, so fabricate one. 1401 */ 1402 char *str = NULL; 1403 1404 if (l_to_str_internal(mnt_sl, &str) == 0 && 1405 dsl_prop_set_string(osname, 1406 zfs_prop_to_name(ZFS_PROP_MLSLABEL), 1407 ZPROP_SRC_LOCAL, str) == 0) 1408 retv = 0; 1409 if (str != NULL) 1410 kmem_free(str, strlen(str) + 1); 1411 } else if (hexstr_to_label(ds_hexsl, &ds_sl) == 0) { 1412 /* 1413 * Now compare labels to complete the MAC check. If the 1414 * labels are equal then allow access. If the mountpoint 1415 * label dominates the dataset label, allow readonly access. 1416 * Otherwise, access is denied. 1417 */ 1418 if (blequal(mnt_sl, &ds_sl)) 1419 retv = 0; 1420 else if (bldominates(mnt_sl, &ds_sl)) { 1421 vfs_setmntopt(vfsp, MNTOPT_RO, NULL, 0); 1422 retv = 0; 1423 } 1424 } 1425 1426 label_rele(mnt_tsl); 1427 zone_rele(mntzone); 1428 return (retv); 1429} 1430#endif /* SECLABEL */ 1431 1432#ifdef OPENSOLARIS_MOUNTROOT 1433static int 1434zfs_mountroot(vfs_t *vfsp, enum whymountroot why) 1435{ 1436 int error = 0; 1437 static int zfsrootdone = 0; 1438 zfsvfs_t *zfsvfs = NULL; 1439 znode_t *zp = NULL; 1440 vnode_t *vp = NULL; 1441 char *zfs_bootfs; 1442 char *zfs_devid; 1443 1444 ASSERT(vfsp); 1445 1446 /* 1447 * The filesystem that we mount as root is defined in the 1448 * boot property "zfs-bootfs" with a format of 1449 * "poolname/root-dataset-objnum". 1450 */ 1451 if (why == ROOT_INIT) { 1452 if (zfsrootdone++) 1453 return (SET_ERROR(EBUSY)); 1454 /* 1455 * the process of doing a spa_load will require the 1456 * clock to be set before we could (for example) do 1457 * something better by looking at the timestamp on 1458 * an uberblock, so just set it to -1. 1459 */ 1460 clkset(-1); 1461 1462 if ((zfs_bootfs = spa_get_bootprop("zfs-bootfs")) == NULL) { 1463 cmn_err(CE_NOTE, "spa_get_bootfs: can not get " 1464 "bootfs name"); 1465 return (SET_ERROR(EINVAL)); 1466 } 1467 zfs_devid = spa_get_bootprop("diskdevid"); 1468 error = spa_import_rootpool(rootfs.bo_name, zfs_devid); 1469 if (zfs_devid) 1470 spa_free_bootprop(zfs_devid); 1471 if (error) { 1472 spa_free_bootprop(zfs_bootfs); 1473 cmn_err(CE_NOTE, "spa_import_rootpool: error %d", 1474 error); 1475 return (error); 1476 } 1477 if (error = zfs_parse_bootfs(zfs_bootfs, rootfs.bo_name)) { 1478 spa_free_bootprop(zfs_bootfs); 1479 cmn_err(CE_NOTE, "zfs_parse_bootfs: error %d", 1480 error); 1481 return (error); 1482 } 1483 1484 spa_free_bootprop(zfs_bootfs); 1485 1486 if (error = vfs_lock(vfsp)) 1487 return (error); 1488 1489 if (error = zfs_domount(vfsp, rootfs.bo_name)) { 1490 cmn_err(CE_NOTE, "zfs_domount: error %d", error); 1491 goto out; 1492 } 1493 1494 zfsvfs = (zfsvfs_t *)vfsp->vfs_data; 1495 ASSERT(zfsvfs); 1496 if (error = zfs_zget(zfsvfs, zfsvfs->z_root, &zp)) { 1497 cmn_err(CE_NOTE, "zfs_zget: error %d", error); 1498 goto out; 1499 } 1500 1501 vp = ZTOV(zp); 1502 mutex_enter(&vp->v_lock); 1503 vp->v_flag |= VROOT; 1504 mutex_exit(&vp->v_lock); 1505 rootvp = vp; 1506 1507 /* 1508 * Leave rootvp held. The root file system is never unmounted. 1509 */ 1510 1511 vfs_add((struct vnode *)0, vfsp, 1512 (vfsp->vfs_flag & VFS_RDONLY) ? MS_RDONLY : 0); 1513out: 1514 vfs_unlock(vfsp); 1515 return (error); 1516 } else if (why == ROOT_REMOUNT) { 1517 readonly_changed_cb(vfsp->vfs_data, B_FALSE); 1518 vfsp->vfs_flag |= VFS_REMOUNT; 1519 1520 /* refresh mount options */ 1521 zfs_unregister_callbacks(vfsp->vfs_data); 1522 return (zfs_register_callbacks(vfsp)); 1523 1524 } else if (why == ROOT_UNMOUNT) { 1525 zfs_unregister_callbacks((zfsvfs_t *)vfsp->vfs_data); 1526 (void) zfs_sync(vfsp, 0, 0); 1527 return (0); 1528 } 1529 1530 /* 1531 * if "why" is equal to anything else other than ROOT_INIT, 1532 * ROOT_REMOUNT, or ROOT_UNMOUNT, we do not support it. 1533 */ 1534 return (SET_ERROR(ENOTSUP)); 1535} 1536#endif /* OPENSOLARIS_MOUNTROOT */ 1537 1538static int 1539getpoolname(const char *osname, char *poolname) 1540{ 1541 char *p; 1542 1543 p = strchr(osname, '/'); 1544 if (p == NULL) { 1545 if (strlen(osname) >= MAXNAMELEN) 1546 return (ENAMETOOLONG); 1547 (void) strcpy(poolname, osname); 1548 } else { 1549 if (p - osname >= MAXNAMELEN) 1550 return (ENAMETOOLONG); 1551 (void) strncpy(poolname, osname, p - osname); 1552 poolname[p - osname] = '\0'; 1553 } 1554 return (0); 1555} 1556 1557/*ARGSUSED*/ 1558static int 1559zfs_mount(vfs_t *vfsp) 1560{ 1561 kthread_t *td = curthread; 1562 vnode_t *mvp = vfsp->mnt_vnodecovered; 1563 cred_t *cr = td->td_ucred; 1564 char *osname; 1565 int error = 0; 1566 int canwrite; 1567 1568#ifdef illumos 1569 if (mvp->v_type != VDIR) 1570 return (SET_ERROR(ENOTDIR)); 1571 1572 mutex_enter(&mvp->v_lock); 1573 if ((uap->flags & MS_REMOUNT) == 0 && 1574 (uap->flags & MS_OVERLAY) == 0 && 1575 (mvp->v_count != 1 || (mvp->v_flag & VROOT))) { 1576 mutex_exit(&mvp->v_lock); 1577 return (SET_ERROR(EBUSY)); 1578 } 1579 mutex_exit(&mvp->v_lock); 1580 1581 /* 1582 * ZFS does not support passing unparsed data in via MS_DATA. 1583 * Users should use the MS_OPTIONSTR interface; this means 1584 * that all option parsing is already done and the options struct 1585 * can be interrogated. 1586 */ 1587 if ((uap->flags & MS_DATA) && uap->datalen > 0) 1588#else /* !illumos */ 1589 if (!prison_allow(td->td_ucred, PR_ALLOW_MOUNT_ZFS)) 1590 return (SET_ERROR(EPERM)); 1591 1592 if (vfs_getopt(vfsp->mnt_optnew, "from", (void **)&osname, NULL)) 1593 return (SET_ERROR(EINVAL)); 1594#endif /* illumos */ 1595 1596 /* 1597 * If full-owner-access is enabled and delegated administration is 1598 * turned on, we must set nosuid. 1599 */ 1600 if (zfs_super_owner && 1601 dsl_deleg_access(osname, ZFS_DELEG_PERM_MOUNT, cr) != ECANCELED) { 1602 secpolicy_fs_mount_clearopts(cr, vfsp); 1603 } 1604 1605 /* 1606 * Check for mount privilege? 1607 * 1608 * If we don't have privilege then see if 1609 * we have local permission to allow it 1610 */ 1611 error = secpolicy_fs_mount(cr, mvp, vfsp); 1612 if (error) { 1613 if (dsl_deleg_access(osname, ZFS_DELEG_PERM_MOUNT, cr) != 0) 1614 goto out; 1615 1616 if (!(vfsp->vfs_flag & MS_REMOUNT)) { 1617 vattr_t vattr; 1618 1619 /* 1620 * Make sure user is the owner of the mount point 1621 * or has sufficient privileges. 1622 */ 1623 1624 vattr.va_mask = AT_UID; 1625 1626 vn_lock(mvp, LK_SHARED | LK_RETRY); 1627 if (VOP_GETATTR(mvp, &vattr, cr)) { 1628 VOP_UNLOCK(mvp, 0); 1629 goto out; 1630 } 1631 1632 if (secpolicy_vnode_owner(mvp, cr, vattr.va_uid) != 0 && 1633 VOP_ACCESS(mvp, VWRITE, cr, td) != 0) { 1634 VOP_UNLOCK(mvp, 0); 1635 goto out; 1636 } 1637 VOP_UNLOCK(mvp, 0); 1638 } 1639 1640 secpolicy_fs_mount_clearopts(cr, vfsp); 1641 } 1642 1643 /* 1644 * Refuse to mount a filesystem if we are in a local zone and the 1645 * dataset is not visible. 1646 */ 1647 if (!INGLOBALZONE(curthread) && 1648 (!zone_dataset_visible(osname, &canwrite) || !canwrite)) { 1649 error = SET_ERROR(EPERM); 1650 goto out; 1651 } 1652 1653#ifdef SECLABEL 1654 error = zfs_mount_label_policy(vfsp, osname); 1655 if (error) 1656 goto out; 1657#endif 1658 1659 vfsp->vfs_flag |= MNT_NFS4ACLS; 1660 1661 /* 1662 * When doing a remount, we simply refresh our temporary properties 1663 * according to those options set in the current VFS options. 1664 */ 1665 if (vfsp->vfs_flag & MS_REMOUNT) { 1666 zfsvfs_t *zfsvfs = vfsp->vfs_data; 1667 1668 /* 1669 * Refresh mount options with z_teardown_lock blocking I/O while 1670 * the filesystem is in an inconsistent state. 1671 * The lock also serializes this code with filesystem 1672 * manipulations between entry to zfs_suspend_fs() and return 1673 * from zfs_resume_fs(). 1674 */ 1675 rrm_enter(&zfsvfs->z_teardown_lock, RW_WRITER, FTAG); 1676 zfs_unregister_callbacks(zfsvfs); 1677 error = zfs_register_callbacks(vfsp); 1678 rrm_exit(&zfsvfs->z_teardown_lock, FTAG); 1679 goto out; 1680 } 1681 1682 /* Initial root mount: try hard to import the requested root pool. */ 1683 if ((vfsp->vfs_flag & MNT_ROOTFS) != 0 && 1684 (vfsp->vfs_flag & MNT_UPDATE) == 0) { 1685 char pname[MAXNAMELEN]; 1686 1687 error = getpoolname(osname, pname); 1688 if (error == 0) 1689 error = spa_import_rootpool(pname); 1690 if (error) 1691 goto out; 1692 } 1693 DROP_GIANT(); 1694 error = zfs_domount(vfsp, osname); 1695 PICKUP_GIANT(); 1696 1697#ifdef illumos 1698 /* 1699 * Add an extra VFS_HOLD on our parent vfs so that it can't 1700 * disappear due to a forced unmount. 1701 */ 1702 if (error == 0 && ((zfsvfs_t *)vfsp->vfs_data)->z_issnap) 1703 VFS_HOLD(mvp->v_vfsp); 1704#endif 1705 1706out: 1707 return (error); 1708} 1709 1710static int 1711zfs_statfs(vfs_t *vfsp, struct statfs *statp) 1712{ 1713 zfsvfs_t *zfsvfs = vfsp->vfs_data; 1714 uint64_t refdbytes, availbytes, usedobjs, availobjs; 1715 1716 statp->f_version = STATFS_VERSION; 1717 1718 ZFS_ENTER(zfsvfs); 1719 1720 dmu_objset_space(zfsvfs->z_os, 1721 &refdbytes, &availbytes, &usedobjs, &availobjs); 1722 1723 /* 1724 * The underlying storage pool actually uses multiple block sizes. 1725 * We report the fragsize as the smallest block size we support, 1726 * and we report our blocksize as the filesystem's maximum blocksize. 1727 */ 1728 statp->f_bsize = SPA_MINBLOCKSIZE; 1729 statp->f_iosize = zfsvfs->z_vfs->mnt_stat.f_iosize; 1730 1731 /* 1732 * The following report "total" blocks of various kinds in the 1733 * file system, but reported in terms of f_frsize - the 1734 * "fragment" size. 1735 */ 1736 1737 statp->f_blocks = (refdbytes + availbytes) >> SPA_MINBLOCKSHIFT; 1738 statp->f_bfree = availbytes / statp->f_bsize; 1739 statp->f_bavail = statp->f_bfree; /* no root reservation */ 1740 1741 /* 1742 * statvfs() should really be called statufs(), because it assumes 1743 * static metadata. ZFS doesn't preallocate files, so the best 1744 * we can do is report the max that could possibly fit in f_files, 1745 * and that minus the number actually used in f_ffree. 1746 * For f_ffree, report the smaller of the number of object available 1747 * and the number of blocks (each object will take at least a block). 1748 */ 1749 statp->f_ffree = MIN(availobjs, statp->f_bfree); 1750 statp->f_files = statp->f_ffree + usedobjs; 1751 1752 /* 1753 * We're a zfs filesystem. 1754 */ 1755 (void) strlcpy(statp->f_fstypename, "zfs", sizeof(statp->f_fstypename)); 1756 1757 strlcpy(statp->f_mntfromname, vfsp->mnt_stat.f_mntfromname, 1758 sizeof(statp->f_mntfromname)); 1759 strlcpy(statp->f_mntonname, vfsp->mnt_stat.f_mntonname, 1760 sizeof(statp->f_mntonname)); 1761 1762 statp->f_namemax = ZFS_MAXNAMELEN; 1763 1764 ZFS_EXIT(zfsvfs); 1765 return (0); 1766} 1767 1768static int 1769zfs_root(vfs_t *vfsp, int flags, vnode_t **vpp) 1770{ 1771 zfsvfs_t *zfsvfs = vfsp->vfs_data; 1772 znode_t *rootzp; 1773 int error; 1774 1775 ZFS_ENTER(zfsvfs); 1776 1777 error = zfs_zget(zfsvfs, zfsvfs->z_root, &rootzp); 1778 if (error == 0) 1779 *vpp = ZTOV(rootzp); 1780 1781 ZFS_EXIT(zfsvfs); 1782 1783 if (error == 0) { 1784 error = vn_lock(*vpp, flags); 1785 if (error == 0) 1786 (*vpp)->v_vflag |= VV_ROOT; 1787 } 1788 if (error != 0) 1789 *vpp = NULL; 1790 1791 return (error); 1792} 1793 1794/* 1795 * Teardown the zfsvfs::z_os. 1796 * 1797 * Note, if 'unmounting' if FALSE, we return with the 'z_teardown_lock' 1798 * and 'z_teardown_inactive_lock' held. 1799 */ 1800static int 1801zfsvfs_teardown(zfsvfs_t *zfsvfs, boolean_t unmounting) 1802{ 1803 znode_t *zp; 1804 1805 rrm_enter(&zfsvfs->z_teardown_lock, RW_WRITER, FTAG); 1806 1807 if (!unmounting) { 1808 /* 1809 * We purge the parent filesystem's vfsp as the parent 1810 * filesystem and all of its snapshots have their vnode's 1811 * v_vfsp set to the parent's filesystem's vfsp. Note, 1812 * 'z_parent' is self referential for non-snapshots. 1813 */ 1814 (void) dnlc_purge_vfsp(zfsvfs->z_parent->z_vfs, 0); 1815#ifdef FREEBSD_NAMECACHE 1816 cache_purgevfs(zfsvfs->z_parent->z_vfs); 1817#endif 1818 } 1819 1820 /* 1821 * Close the zil. NB: Can't close the zil while zfs_inactive 1822 * threads are blocked as zil_close can call zfs_inactive. 1823 */ 1824 if (zfsvfs->z_log) { 1825 zil_close(zfsvfs->z_log); 1826 zfsvfs->z_log = NULL; 1827 } 1828 1829 rw_enter(&zfsvfs->z_teardown_inactive_lock, RW_WRITER); 1830 1831 /* 1832 * If we are not unmounting (ie: online recv) and someone already 1833 * unmounted this file system while we were doing the switcheroo, 1834 * or a reopen of z_os failed then just bail out now. 1835 */ 1836 if (!unmounting && (zfsvfs->z_unmounted || zfsvfs->z_os == NULL)) { 1837 rw_exit(&zfsvfs->z_teardown_inactive_lock); 1838 rrm_exit(&zfsvfs->z_teardown_lock, FTAG); 1839 return (SET_ERROR(EIO)); 1840 } 1841 1842 /* 1843 * At this point there are no vops active, and any new vops will 1844 * fail with EIO since we have z_teardown_lock for writer (only 1845 * relavent for forced unmount). 1846 * 1847 * Release all holds on dbufs. 1848 */ 1849 mutex_enter(&zfsvfs->z_znodes_lock); 1850 for (zp = list_head(&zfsvfs->z_all_znodes); zp != NULL; 1851 zp = list_next(&zfsvfs->z_all_znodes, zp)) 1852 if (zp->z_sa_hdl) { 1853 ASSERT(ZTOV(zp)->v_count >= 0); 1854 zfs_znode_dmu_fini(zp); 1855 } 1856 mutex_exit(&zfsvfs->z_znodes_lock); 1857 1858 /* 1859 * If we are unmounting, set the unmounted flag and let new vops 1860 * unblock. zfs_inactive will have the unmounted behavior, and all 1861 * other vops will fail with EIO. 1862 */ 1863 if (unmounting) { 1864 zfsvfs->z_unmounted = B_TRUE; 1865 rrm_exit(&zfsvfs->z_teardown_lock, FTAG); 1866 rw_exit(&zfsvfs->z_teardown_inactive_lock); 1867 } 1868 1869 /* 1870 * z_os will be NULL if there was an error in attempting to reopen 1871 * zfsvfs, so just return as the properties had already been 1872 * unregistered and cached data had been evicted before. 1873 */ 1874 if (zfsvfs->z_os == NULL) 1875 return (0); 1876 1877 /* 1878 * Unregister properties. 1879 */ 1880 zfs_unregister_callbacks(zfsvfs); 1881 1882 /* 1883 * Evict cached data 1884 */ 1885 if (dsl_dataset_is_dirty(dmu_objset_ds(zfsvfs->z_os)) && 1886 !(zfsvfs->z_vfs->vfs_flag & VFS_RDONLY)) 1887 txg_wait_synced(dmu_objset_pool(zfsvfs->z_os), 0); 1888 dmu_objset_evict_dbufs(zfsvfs->z_os); 1889 1890 return (0); 1891} 1892 1893/*ARGSUSED*/ 1894static int 1895zfs_umount(vfs_t *vfsp, int fflag) 1896{ 1897 kthread_t *td = curthread; 1898 zfsvfs_t *zfsvfs = vfsp->vfs_data; 1899 objset_t *os; 1900 cred_t *cr = td->td_ucred; 1901 int ret; 1902 1903 ret = secpolicy_fs_unmount(cr, vfsp); 1904 if (ret) { 1905 if (dsl_deleg_access((char *)refstr_value(vfsp->vfs_resource), 1906 ZFS_DELEG_PERM_MOUNT, cr)) 1907 return (ret); 1908 } 1909 1910 /* 1911 * We purge the parent filesystem's vfsp as the parent filesystem 1912 * and all of its snapshots have their vnode's v_vfsp set to the 1913 * parent's filesystem's vfsp. Note, 'z_parent' is self 1914 * referential for non-snapshots. 1915 */ 1916 (void) dnlc_purge_vfsp(zfsvfs->z_parent->z_vfs, 0); 1917 1918 /* 1919 * Unmount any snapshots mounted under .zfs before unmounting the 1920 * dataset itself. 1921 */ 1922 if (zfsvfs->z_ctldir != NULL) { 1923 if ((ret = zfsctl_umount_snapshots(vfsp, fflag, cr)) != 0) 1924 return (ret); 1925 ret = vflush(vfsp, 0, 0, td); 1926 ASSERT(ret == EBUSY); 1927 if (!(fflag & MS_FORCE)) { 1928 if (zfsvfs->z_ctldir->v_count > 1) 1929 return (EBUSY); 1930 ASSERT(zfsvfs->z_ctldir->v_count == 1); 1931 } 1932 zfsctl_destroy(zfsvfs); 1933 ASSERT(zfsvfs->z_ctldir == NULL); 1934 } 1935 1936 if (fflag & MS_FORCE) { 1937 /* 1938 * Mark file system as unmounted before calling 1939 * vflush(FORCECLOSE). This way we ensure no future vnops 1940 * will be called and risk operating on DOOMED vnodes. 1941 */ 1942 rrm_enter(&zfsvfs->z_teardown_lock, RW_WRITER, FTAG); 1943 zfsvfs->z_unmounted = B_TRUE; 1944 rrm_exit(&zfsvfs->z_teardown_lock, FTAG); 1945 } 1946 1947 /* 1948 * Flush all the files. 1949 */ 1950 ret = vflush(vfsp, 0, (fflag & MS_FORCE) ? FORCECLOSE : 0, td); 1951 if (ret != 0) { 1952 if (!zfsvfs->z_issnap) { 1953 zfsctl_create(zfsvfs); 1954 ASSERT(zfsvfs->z_ctldir != NULL); 1955 } 1956 return (ret); 1957 } 1958 1959#ifdef illumos 1960 if (!(fflag & MS_FORCE)) { 1961 /* 1962 * Check the number of active vnodes in the file system. 1963 * Our count is maintained in the vfs structure, but the 1964 * number is off by 1 to indicate a hold on the vfs 1965 * structure itself. 1966 * 1967 * The '.zfs' directory maintains a reference of its 1968 * own, and any active references underneath are 1969 * reflected in the vnode count. 1970 */ 1971 if (zfsvfs->z_ctldir == NULL) { 1972 if (vfsp->vfs_count > 1) 1973 return (SET_ERROR(EBUSY)); 1974 } else { 1975 if (vfsp->vfs_count > 2 || 1976 zfsvfs->z_ctldir->v_count > 1) 1977 return (SET_ERROR(EBUSY)); 1978 } 1979 } 1980#endif 1981 1982 VERIFY(zfsvfs_teardown(zfsvfs, B_TRUE) == 0); 1983 os = zfsvfs->z_os; 1984 1985 /* 1986 * z_os will be NULL if there was an error in 1987 * attempting to reopen zfsvfs. 1988 */ 1989 if (os != NULL) { 1990 /* 1991 * Unset the objset user_ptr. 1992 */ 1993 mutex_enter(&os->os_user_ptr_lock); 1994 dmu_objset_set_user(os, NULL); 1995 mutex_exit(&os->os_user_ptr_lock); 1996 1997 /* 1998 * Finally release the objset 1999 */ 2000 dmu_objset_disown(os, zfsvfs); 2001 } 2002 2003 /* 2004 * We can now safely destroy the '.zfs' directory node. 2005 */ 2006 if (zfsvfs->z_ctldir != NULL) 2007 zfsctl_destroy(zfsvfs); 2008 if (zfsvfs->z_issnap) { 2009 vnode_t *svp = vfsp->mnt_vnodecovered; 2010 2011 if (svp->v_count >= 2) 2012 VN_RELE(svp); 2013 } 2014 zfs_freevfs(vfsp); 2015 2016 return (0); 2017} 2018 2019static int 2020zfs_vget(vfs_t *vfsp, ino_t ino, int flags, vnode_t **vpp) 2021{ 2022 zfsvfs_t *zfsvfs = vfsp->vfs_data; 2023 znode_t *zp; 2024 int err; 2025 2026 /* 2027 * zfs_zget() can't operate on virtual entries like .zfs/ or 2028 * .zfs/snapshot/ directories, that's why we return EOPNOTSUPP. 2029 * This will make NFS to switch to LOOKUP instead of using VGET. 2030 */ 2031 if (ino == ZFSCTL_INO_ROOT || ino == ZFSCTL_INO_SNAPDIR || 2032 (zfsvfs->z_shares_dir != 0 && ino == zfsvfs->z_shares_dir)) 2033 return (EOPNOTSUPP); 2034 2035 ZFS_ENTER(zfsvfs); 2036 err = zfs_zget(zfsvfs, ino, &zp); 2037 if (err == 0 && zp->z_unlinked) { 2038 VN_RELE(ZTOV(zp)); 2039 err = EINVAL; 2040 } 2041 if (err == 0) 2042 *vpp = ZTOV(zp); 2043 ZFS_EXIT(zfsvfs); 2044 if (err == 0) 2045 err = vn_lock(*vpp, flags); 2046 if (err != 0) 2047 *vpp = NULL; 2048 return (err); 2049} 2050 2051static int 2052zfs_checkexp(vfs_t *vfsp, struct sockaddr *nam, int *extflagsp, 2053 struct ucred **credanonp, int *numsecflavors, int **secflavors) 2054{ 2055 zfsvfs_t *zfsvfs = vfsp->vfs_data; 2056 2057 /* 2058 * If this is regular file system vfsp is the same as 2059 * zfsvfs->z_parent->z_vfs, but if it is snapshot, 2060 * zfsvfs->z_parent->z_vfs represents parent file system 2061 * which we have to use here, because only this file system 2062 * has mnt_export configured. 2063 */ 2064 return (vfs_stdcheckexp(zfsvfs->z_parent->z_vfs, nam, extflagsp, 2065 credanonp, numsecflavors, secflavors)); 2066} 2067 2068CTASSERT(SHORT_FID_LEN <= sizeof(struct fid)); 2069CTASSERT(LONG_FID_LEN <= sizeof(struct fid)); 2070 2071static int 2072zfs_fhtovp(vfs_t *vfsp, fid_t *fidp, int flags, vnode_t **vpp) 2073{ 2074 zfsvfs_t *zfsvfs = vfsp->vfs_data; 2075 znode_t *zp; 2076 uint64_t object = 0; 2077 uint64_t fid_gen = 0; 2078 uint64_t gen_mask; 2079 uint64_t zp_gen; 2080 int i, err; 2081 2082 *vpp = NULL; 2083 2084 ZFS_ENTER(zfsvfs); 2085 2086 /* 2087 * On FreeBSD we can get snapshot's mount point or its parent file 2088 * system mount point depending if snapshot is already mounted or not. 2089 */ 2090 if (zfsvfs->z_parent == zfsvfs && fidp->fid_len == LONG_FID_LEN) { 2091 zfid_long_t *zlfid = (zfid_long_t *)fidp; 2092 uint64_t objsetid = 0; 2093 uint64_t setgen = 0; 2094 2095 for (i = 0; i < sizeof (zlfid->zf_setid); i++) 2096 objsetid |= ((uint64_t)zlfid->zf_setid[i]) << (8 * i); 2097 2098 for (i = 0; i < sizeof (zlfid->zf_setgen); i++) 2099 setgen |= ((uint64_t)zlfid->zf_setgen[i]) << (8 * i); 2100 2101 ZFS_EXIT(zfsvfs); 2102 2103 err = zfsctl_lookup_objset(vfsp, objsetid, &zfsvfs); 2104 if (err) 2105 return (SET_ERROR(EINVAL)); 2106 ZFS_ENTER(zfsvfs); 2107 } 2108 2109 if (fidp->fid_len == SHORT_FID_LEN || fidp->fid_len == LONG_FID_LEN) { 2110 zfid_short_t *zfid = (zfid_short_t *)fidp; 2111 2112 for (i = 0; i < sizeof (zfid->zf_object); i++) 2113 object |= ((uint64_t)zfid->zf_object[i]) << (8 * i); 2114 2115 for (i = 0; i < sizeof (zfid->zf_gen); i++) 2116 fid_gen |= ((uint64_t)zfid->zf_gen[i]) << (8 * i); 2117 } else { 2118 ZFS_EXIT(zfsvfs); 2119 return (SET_ERROR(EINVAL)); 2120 } 2121 2122 /* 2123 * A zero fid_gen means we are in .zfs or the .zfs/snapshot 2124 * directory tree. If the object == zfsvfs->z_shares_dir, then 2125 * we are in the .zfs/shares directory tree. 2126 */ 2127 if ((fid_gen == 0 && 2128 (object == ZFSCTL_INO_ROOT || object == ZFSCTL_INO_SNAPDIR)) || 2129 (zfsvfs->z_shares_dir != 0 && object == zfsvfs->z_shares_dir)) { 2130 *vpp = zfsvfs->z_ctldir; 2131 ASSERT(*vpp != NULL); 2132 if (object == ZFSCTL_INO_SNAPDIR) { 2133 VERIFY(zfsctl_root_lookup(*vpp, "snapshot", vpp, NULL, 2134 0, NULL, NULL, NULL, NULL, NULL) == 0); 2135 } else if (object == zfsvfs->z_shares_dir) { 2136 VERIFY(zfsctl_root_lookup(*vpp, "shares", vpp, NULL, 2137 0, NULL, NULL, NULL, NULL, NULL) == 0); 2138 } else { 2139 VN_HOLD(*vpp); 2140 } 2141 ZFS_EXIT(zfsvfs); 2142 err = vn_lock(*vpp, flags); 2143 if (err != 0) 2144 *vpp = NULL; 2145 return (err); 2146 } 2147 2148 gen_mask = -1ULL >> (64 - 8 * i); 2149 2150 dprintf("getting %llu [%u mask %llx]\n", object, fid_gen, gen_mask); 2151 if (err = zfs_zget(zfsvfs, object, &zp)) { 2152 ZFS_EXIT(zfsvfs); 2153 return (err); 2154 } 2155 (void) sa_lookup(zp->z_sa_hdl, SA_ZPL_GEN(zfsvfs), &zp_gen, 2156 sizeof (uint64_t)); 2157 zp_gen = zp_gen & gen_mask; 2158 if (zp_gen == 0) 2159 zp_gen = 1; 2160 if (zp->z_unlinked || zp_gen != fid_gen) { 2161 dprintf("znode gen (%u) != fid gen (%u)\n", zp_gen, fid_gen); 2162 VN_RELE(ZTOV(zp)); 2163 ZFS_EXIT(zfsvfs); 2164 return (SET_ERROR(EINVAL)); 2165 } 2166 2167 *vpp = ZTOV(zp); 2168 ZFS_EXIT(zfsvfs); 2169 err = vn_lock(*vpp, flags | LK_RETRY); 2170 if (err == 0) 2171 vnode_create_vobject(*vpp, zp->z_size, curthread); 2172 else 2173 *vpp = NULL; 2174 return (err); 2175} 2176 2177/* 2178 * Block out VOPs and close zfsvfs_t::z_os 2179 * 2180 * Note, if successful, then we return with the 'z_teardown_lock' and 2181 * 'z_teardown_inactive_lock' write held. We leave ownership of the underlying 2182 * dataset and objset intact so that they can be atomically handed off during 2183 * a subsequent rollback or recv operation and the resume thereafter. 2184 */ 2185int 2186zfs_suspend_fs(zfsvfs_t *zfsvfs) 2187{ 2188 int error; 2189 2190 if ((error = zfsvfs_teardown(zfsvfs, B_FALSE)) != 0) 2191 return (error); 2192 2193 return (0); 2194} 2195 2196/* 2197 * Rebuild SA and release VOPs. Note that ownership of the underlying dataset 2198 * is an invariant across any of the operations that can be performed while the 2199 * filesystem was suspended. Whether it succeeded or failed, the preconditions 2200 * are the same: the relevant objset and associated dataset are owned by 2201 * zfsvfs, held, and long held on entry. 2202 */ 2203int 2204zfs_resume_fs(zfsvfs_t *zfsvfs, const char *osname) 2205{ 2206 int err; 2207 znode_t *zp; 2208 uint64_t sa_obj = 0; 2209 2210 ASSERT(RRM_WRITE_HELD(&zfsvfs->z_teardown_lock)); 2211 ASSERT(RW_WRITE_HELD(&zfsvfs->z_teardown_inactive_lock)); 2212 2213 /* 2214 * We already own this, so just hold and rele it to update the 2215 * objset_t, as the one we had before may have been evicted. 2216 */ 2217 VERIFY0(dmu_objset_hold(osname, zfsvfs, &zfsvfs->z_os)); 2218 VERIFY3P(zfsvfs->z_os->os_dsl_dataset->ds_owner, ==, zfsvfs); 2219 VERIFY(dsl_dataset_long_held(zfsvfs->z_os->os_dsl_dataset)); 2220 dmu_objset_rele(zfsvfs->z_os, zfsvfs); 2221 2222 /* 2223 * Make sure version hasn't changed 2224 */ 2225 2226 err = zfs_get_zplprop(zfsvfs->z_os, ZFS_PROP_VERSION, 2227 &zfsvfs->z_version); 2228 2229 if (err) 2230 goto bail; 2231 2232 err = zap_lookup(zfsvfs->z_os, MASTER_NODE_OBJ, 2233 ZFS_SA_ATTRS, 8, 1, &sa_obj); 2234 2235 if (err && zfsvfs->z_version >= ZPL_VERSION_SA) 2236 goto bail; 2237 2238 if ((err = sa_setup(zfsvfs->z_os, sa_obj, 2239 zfs_attr_table, ZPL_END, &zfsvfs->z_attr_table)) != 0) 2240 goto bail; 2241 2242 if (zfsvfs->z_version >= ZPL_VERSION_SA) 2243 sa_register_update_callback(zfsvfs->z_os, 2244 zfs_sa_upgrade); 2245 2246 VERIFY(zfsvfs_setup(zfsvfs, B_FALSE) == 0); 2247 2248 zfs_set_fuid_feature(zfsvfs); 2249 2250 /* 2251 * Attempt to re-establish all the active znodes with 2252 * their dbufs. If a zfs_rezget() fails, then we'll let 2253 * any potential callers discover that via ZFS_ENTER_VERIFY_VP 2254 * when they try to use their znode. 2255 */ 2256 mutex_enter(&zfsvfs->z_znodes_lock); 2257 for (zp = list_head(&zfsvfs->z_all_znodes); zp; 2258 zp = list_next(&zfsvfs->z_all_znodes, zp)) { 2259 (void) zfs_rezget(zp); 2260 } 2261 mutex_exit(&zfsvfs->z_znodes_lock); 2262 2263bail: 2264 /* release the VOPs */ 2265 rw_exit(&zfsvfs->z_teardown_inactive_lock); 2266 rrm_exit(&zfsvfs->z_teardown_lock, FTAG); 2267 2268 if (err) { 2269 /* 2270 * Since we couldn't setup the sa framework, try to force 2271 * unmount this file system. 2272 */ 2273 if (vn_vfswlock(zfsvfs->z_vfs->vfs_vnodecovered) == 0) { 2274 vfs_ref(zfsvfs->z_vfs); 2275 (void) dounmount(zfsvfs->z_vfs, MS_FORCE, curthread); 2276 } 2277 } 2278 return (err); 2279} 2280 2281static void 2282zfs_freevfs(vfs_t *vfsp) 2283{ 2284 zfsvfs_t *zfsvfs = vfsp->vfs_data; 2285 2286#ifdef illumos 2287 /* 2288 * If this is a snapshot, we have an extra VFS_HOLD on our parent 2289 * from zfs_mount(). Release it here. If we came through 2290 * zfs_mountroot() instead, we didn't grab an extra hold, so 2291 * skip the VFS_RELE for rootvfs. 2292 */ 2293 if (zfsvfs->z_issnap && (vfsp != rootvfs)) 2294 VFS_RELE(zfsvfs->z_parent->z_vfs); 2295#endif 2296 2297 zfsvfs_free(zfsvfs); 2298 2299 atomic_dec_32(&zfs_active_fs_count); 2300} 2301 2302#ifdef __i386__ 2303static int desiredvnodes_backup; 2304#endif 2305 2306static void 2307zfs_vnodes_adjust(void) 2308{ 2309#ifdef __i386__ 2310 int newdesiredvnodes; 2311 2312 desiredvnodes_backup = desiredvnodes; 2313 2314 /* 2315 * We calculate newdesiredvnodes the same way it is done in 2316 * vntblinit(). If it is equal to desiredvnodes, it means that 2317 * it wasn't tuned by the administrator and we can tune it down. 2318 */ 2319 newdesiredvnodes = min(maxproc + cnt.v_page_count / 4, 2 * 2320 vm_kmem_size / (5 * (sizeof(struct vm_object) + 2321 sizeof(struct vnode)))); 2322 if (newdesiredvnodes == desiredvnodes) 2323 desiredvnodes = (3 * newdesiredvnodes) / 4; 2324#endif 2325} 2326 2327static void 2328zfs_vnodes_adjust_back(void) 2329{ 2330 2331#ifdef __i386__ 2332 desiredvnodes = desiredvnodes_backup; 2333#endif 2334} 2335 2336void 2337zfs_init(void) 2338{ 2339 2340 printf("ZFS filesystem version: " ZPL_VERSION_STRING "\n"); 2341 2342 /* 2343 * Initialize .zfs directory structures 2344 */ 2345 zfsctl_init(); 2346 2347 /* 2348 * Initialize znode cache, vnode ops, etc... 2349 */ 2350 zfs_znode_init(); 2351 2352 /* 2353 * Reduce number of vnodes. Originally number of vnodes is calculated 2354 * with UFS inode in mind. We reduce it here, because it's too big for 2355 * ZFS/i386. 2356 */ 2357 zfs_vnodes_adjust(); 2358 2359 dmu_objset_register_type(DMU_OST_ZFS, zfs_space_delta_cb); 2360} 2361 2362void 2363zfs_fini(void) 2364{ 2365 zfsctl_fini(); 2366 zfs_znode_fini(); 2367 zfs_vnodes_adjust_back(); 2368} 2369 2370int 2371zfs_busy(void) 2372{ 2373 return (zfs_active_fs_count != 0); 2374} 2375 2376int 2377zfs_set_version(zfsvfs_t *zfsvfs, uint64_t newvers) 2378{ 2379 int error; 2380 objset_t *os = zfsvfs->z_os; 2381 dmu_tx_t *tx; 2382 2383 if (newvers < ZPL_VERSION_INITIAL || newvers > ZPL_VERSION) 2384 return (SET_ERROR(EINVAL)); 2385 2386 if (newvers < zfsvfs->z_version) 2387 return (SET_ERROR(EINVAL)); 2388 2389 if (zfs_spa_version_map(newvers) > 2390 spa_version(dmu_objset_spa(zfsvfs->z_os))) 2391 return (SET_ERROR(ENOTSUP)); 2392 2393 tx = dmu_tx_create(os); 2394 dmu_tx_hold_zap(tx, MASTER_NODE_OBJ, B_FALSE, ZPL_VERSION_STR); 2395 if (newvers >= ZPL_VERSION_SA && !zfsvfs->z_use_sa) { 2396 dmu_tx_hold_zap(tx, MASTER_NODE_OBJ, B_TRUE, 2397 ZFS_SA_ATTRS); 2398 dmu_tx_hold_zap(tx, DMU_NEW_OBJECT, FALSE, NULL); 2399 } 2400 error = dmu_tx_assign(tx, TXG_WAIT); 2401 if (error) { 2402 dmu_tx_abort(tx); 2403 return (error); 2404 } 2405 2406 error = zap_update(os, MASTER_NODE_OBJ, ZPL_VERSION_STR, 2407 8, 1, &newvers, tx); 2408 2409 if (error) { 2410 dmu_tx_commit(tx); 2411 return (error); 2412 } 2413 2414 if (newvers >= ZPL_VERSION_SA && !zfsvfs->z_use_sa) { 2415 uint64_t sa_obj; 2416 2417 ASSERT3U(spa_version(dmu_objset_spa(zfsvfs->z_os)), >=, 2418 SPA_VERSION_SA); 2419 sa_obj = zap_create(os, DMU_OT_SA_MASTER_NODE, 2420 DMU_OT_NONE, 0, tx); 2421 2422 error = zap_add(os, MASTER_NODE_OBJ, 2423 ZFS_SA_ATTRS, 8, 1, &sa_obj, tx); 2424 ASSERT0(error); 2425 2426 VERIFY(0 == sa_set_sa_object(os, sa_obj)); 2427 sa_register_update_callback(os, zfs_sa_upgrade); 2428 } 2429 2430 spa_history_log_internal_ds(dmu_objset_ds(os), "upgrade", tx, 2431 "from %llu to %llu", zfsvfs->z_version, newvers); 2432 2433 dmu_tx_commit(tx); 2434 2435 zfsvfs->z_version = newvers; 2436 2437 zfs_set_fuid_feature(zfsvfs); 2438 2439 return (0); 2440} 2441 2442/* 2443 * Read a property stored within the master node. 2444 */ 2445int 2446zfs_get_zplprop(objset_t *os, zfs_prop_t prop, uint64_t *value) 2447{ 2448 const char *pname; 2449 int error = ENOENT; 2450 2451 /* 2452 * Look up the file system's value for the property. For the 2453 * version property, we look up a slightly different string. 2454 */ 2455 if (prop == ZFS_PROP_VERSION) 2456 pname = ZPL_VERSION_STR; 2457 else 2458 pname = zfs_prop_to_name(prop); 2459 2460 if (os != NULL) 2461 error = zap_lookup(os, MASTER_NODE_OBJ, pname, 8, 1, value); 2462 2463 if (error == ENOENT) { 2464 /* No value set, use the default value */ 2465 switch (prop) { 2466 case ZFS_PROP_VERSION: 2467 *value = ZPL_VERSION; 2468 break; 2469 case ZFS_PROP_NORMALIZE: 2470 case ZFS_PROP_UTF8ONLY: 2471 *value = 0; 2472 break; 2473 case ZFS_PROP_CASE: 2474 *value = ZFS_CASE_SENSITIVE; 2475 break; 2476 default: 2477 return (error); 2478 } 2479 error = 0; 2480 } 2481 return (error); 2482} 2483 2484#ifdef _KERNEL 2485void 2486zfsvfs_update_fromname(const char *oldname, const char *newname) 2487{ 2488 char tmpbuf[MAXPATHLEN]; 2489 struct mount *mp; 2490 char *fromname; 2491 size_t oldlen; 2492 2493 oldlen = strlen(oldname); 2494 2495 mtx_lock(&mountlist_mtx); 2496 TAILQ_FOREACH(mp, &mountlist, mnt_list) { 2497 fromname = mp->mnt_stat.f_mntfromname; 2498 if (strcmp(fromname, oldname) == 0) { 2499 (void)strlcpy(fromname, newname, 2500 sizeof(mp->mnt_stat.f_mntfromname)); 2501 continue; 2502 } 2503 if (strncmp(fromname, oldname, oldlen) == 0 && 2504 (fromname[oldlen] == '/' || fromname[oldlen] == '@')) { 2505 (void)snprintf(tmpbuf, sizeof(tmpbuf), "%s%s", 2506 newname, fromname + oldlen); 2507 (void)strlcpy(fromname, tmpbuf, 2508 sizeof(mp->mnt_stat.f_mntfromname)); 2509 continue; 2510 } 2511 } 2512 mtx_unlock(&mountlist_mtx); 2513} 2514#endif 2515