zfs_vfsops.c revision 252751
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) 2013 by Delphix. All rights reserved. 26 */ 27 28/* Portions Copyright 2010 Robert Milkowski */ 29 30#include <sys/types.h> 31#include <sys/param.h> 32#include <sys/systm.h> 33#include <sys/kernel.h> 34#include <sys/sysmacros.h> 35#include <sys/kmem.h> 36#include <sys/acl.h> 37#include <sys/vnode.h> 38#include <sys/vfs.h> 39#include <sys/mntent.h> 40#include <sys/mount.h> 41#include <sys/cmn_err.h> 42#include <sys/zfs_znode.h> 43#include <sys/zfs_dir.h> 44#include <sys/zil.h> 45#include <sys/fs/zfs.h> 46#include <sys/dmu.h> 47#include <sys/dsl_prop.h> 48#include <sys/dsl_dataset.h> 49#include <sys/dsl_deleg.h> 50#include <sys/spa.h> 51#include <sys/zap.h> 52#include <sys/sa.h> 53#include <sys/sa_impl.h> 54#include <sys/varargs.h> 55#include <sys/policy.h> 56#include <sys/atomic.h> 57#include <sys/zfs_ioctl.h> 58#include <sys/zfs_ctldir.h> 59#include <sys/zfs_fuid.h> 60#include <sys/sunddi.h> 61#include <sys/dnlc.h> 62#include <sys/dmu_objset.h> 63#include <sys/spa_boot.h> 64#include <sys/jail.h> 65#include "zfs_comutil.h" 66 67struct mtx zfs_debug_mtx; 68MTX_SYSINIT(zfs_debug_mtx, &zfs_debug_mtx, "zfs_debug", MTX_DEF); 69 70SYSCTL_NODE(_vfs, OID_AUTO, zfs, CTLFLAG_RW, 0, "ZFS file system"); 71 72int zfs_super_owner; 73SYSCTL_INT(_vfs_zfs, OID_AUTO, super_owner, CTLFLAG_RW, &zfs_super_owner, 0, 74 "File system owner can perform privileged operation on his file systems"); 75 76int zfs_debug_level; 77TUNABLE_INT("vfs.zfs.debug", &zfs_debug_level); 78SYSCTL_INT(_vfs_zfs, OID_AUTO, debug, CTLFLAG_RW, &zfs_debug_level, 0, 79 "Debug level"); 80 81SYSCTL_NODE(_vfs_zfs, OID_AUTO, version, CTLFLAG_RD, 0, "ZFS versions"); 82static int zfs_version_acl = ZFS_ACL_VERSION; 83SYSCTL_INT(_vfs_zfs_version, OID_AUTO, acl, CTLFLAG_RD, &zfs_version_acl, 0, 84 "ZFS_ACL_VERSION"); 85static int zfs_version_spa = SPA_VERSION; 86SYSCTL_INT(_vfs_zfs_version, OID_AUTO, spa, CTLFLAG_RD, &zfs_version_spa, 0, 87 "SPA_VERSION"); 88static int zfs_version_zpl = ZPL_VERSION; 89SYSCTL_INT(_vfs_zfs_version, OID_AUTO, zpl, CTLFLAG_RD, &zfs_version_zpl, 0, 90 "ZPL_VERSION"); 91 92static int zfs_mount(vfs_t *vfsp); 93static int zfs_umount(vfs_t *vfsp, int fflag); 94static int zfs_root(vfs_t *vfsp, int flags, vnode_t **vpp); 95static int zfs_statfs(vfs_t *vfsp, struct statfs *statp); 96static int zfs_vget(vfs_t *vfsp, ino_t ino, int flags, vnode_t **vpp); 97static int zfs_sync(vfs_t *vfsp, int waitfor); 98static int zfs_checkexp(vfs_t *vfsp, struct sockaddr *nam, int *extflagsp, 99 struct ucred **credanonp, int *numsecflavors, int **secflavors); 100static int zfs_fhtovp(vfs_t *vfsp, fid_t *fidp, int flags, vnode_t **vpp); 101static void zfs_objset_close(zfsvfs_t *zfsvfs); 102static void zfs_freevfs(vfs_t *vfsp); 103 104static struct vfsops zfs_vfsops = { 105 .vfs_mount = zfs_mount, 106 .vfs_unmount = zfs_umount, 107 .vfs_root = zfs_root, 108 .vfs_statfs = zfs_statfs, 109 .vfs_vget = zfs_vget, 110 .vfs_sync = zfs_sync, 111 .vfs_checkexp = zfs_checkexp, 112 .vfs_fhtovp = zfs_fhtovp, 113}; 114 115VFS_SET(zfs_vfsops, zfs, VFCF_JAIL | VFCF_DELEGADMIN); 116 117/* 118 * We need to keep a count of active fs's. 119 * This is necessary to prevent our module 120 * from being unloaded after a umount -f 121 */ 122static uint32_t zfs_active_fs_count = 0; 123 124/*ARGSUSED*/ 125static int 126zfs_sync(vfs_t *vfsp, int waitfor) 127{ 128 129 /* 130 * Data integrity is job one. We don't want a compromised kernel 131 * writing to the storage pool, so we never sync during panic. 132 */ 133 if (panicstr) 134 return (0); 135 136 if (vfsp != NULL) { 137 /* 138 * Sync a specific filesystem. 139 */ 140 zfsvfs_t *zfsvfs = vfsp->vfs_data; 141 dsl_pool_t *dp; 142 int error; 143 144 error = vfs_stdsync(vfsp, waitfor); 145 if (error != 0) 146 return (error); 147 148 ZFS_ENTER(zfsvfs); 149 dp = dmu_objset_pool(zfsvfs->z_os); 150 151 /* 152 * If the system is shutting down, then skip any 153 * filesystems which may exist on a suspended pool. 154 */ 155 if (sys_shutdown && spa_suspended(dp->dp_spa)) { 156 ZFS_EXIT(zfsvfs); 157 return (0); 158 } 159 160 if (zfsvfs->z_log != NULL) 161 zil_commit(zfsvfs->z_log, 0); 162 163 ZFS_EXIT(zfsvfs); 164 } else { 165 /* 166 * Sync all ZFS filesystems. This is what happens when you 167 * run sync(1M). Unlike other filesystems, ZFS honors the 168 * request by waiting for all pools to commit all dirty data. 169 */ 170 spa_sync_allpools(); 171 } 172 173 return (0); 174} 175 176#ifndef __FreeBSD__ 177static int 178zfs_create_unique_device(dev_t *dev) 179{ 180 major_t new_major; 181 182 do { 183 ASSERT3U(zfs_minor, <=, MAXMIN32); 184 minor_t start = zfs_minor; 185 do { 186 mutex_enter(&zfs_dev_mtx); 187 if (zfs_minor >= MAXMIN32) { 188 /* 189 * If we're still using the real major 190 * keep out of /dev/zfs and /dev/zvol minor 191 * number space. If we're using a getudev()'ed 192 * major number, we can use all of its minors. 193 */ 194 if (zfs_major == ddi_name_to_major(ZFS_DRIVER)) 195 zfs_minor = ZFS_MIN_MINOR; 196 else 197 zfs_minor = 0; 198 } else { 199 zfs_minor++; 200 } 201 *dev = makedevice(zfs_major, zfs_minor); 202 mutex_exit(&zfs_dev_mtx); 203 } while (vfs_devismounted(*dev) && zfs_minor != start); 204 if (zfs_minor == start) { 205 /* 206 * We are using all ~262,000 minor numbers for the 207 * current major number. Create a new major number. 208 */ 209 if ((new_major = getudev()) == (major_t)-1) { 210 cmn_err(CE_WARN, 211 "zfs_mount: Can't get unique major " 212 "device number."); 213 return (-1); 214 } 215 mutex_enter(&zfs_dev_mtx); 216 zfs_major = new_major; 217 zfs_minor = 0; 218 219 mutex_exit(&zfs_dev_mtx); 220 } else { 221 break; 222 } 223 /* CONSTANTCONDITION */ 224 } while (1); 225 226 return (0); 227} 228#endif /* !__FreeBSD__ */ 229 230static void 231atime_changed_cb(void *arg, uint64_t newval) 232{ 233 zfsvfs_t *zfsvfs = arg; 234 235 if (newval == TRUE) { 236 zfsvfs->z_atime = TRUE; 237 zfsvfs->z_vfs->vfs_flag &= ~MNT_NOATIME; 238 vfs_clearmntopt(zfsvfs->z_vfs, MNTOPT_NOATIME); 239 vfs_setmntopt(zfsvfs->z_vfs, MNTOPT_ATIME, NULL, 0); 240 } else { 241 zfsvfs->z_atime = FALSE; 242 zfsvfs->z_vfs->vfs_flag |= MNT_NOATIME; 243 vfs_clearmntopt(zfsvfs->z_vfs, MNTOPT_ATIME); 244 vfs_setmntopt(zfsvfs->z_vfs, MNTOPT_NOATIME, NULL, 0); 245 } 246} 247 248static void 249xattr_changed_cb(void *arg, uint64_t newval) 250{ 251 zfsvfs_t *zfsvfs = arg; 252 253 if (newval == TRUE) { 254 /* XXX locking on vfs_flag? */ 255#ifdef TODO 256 zfsvfs->z_vfs->vfs_flag |= VFS_XATTR; 257#endif 258 vfs_clearmntopt(zfsvfs->z_vfs, MNTOPT_NOXATTR); 259 vfs_setmntopt(zfsvfs->z_vfs, MNTOPT_XATTR, NULL, 0); 260 } else { 261 /* XXX locking on vfs_flag? */ 262#ifdef TODO 263 zfsvfs->z_vfs->vfs_flag &= ~VFS_XATTR; 264#endif 265 vfs_clearmntopt(zfsvfs->z_vfs, MNTOPT_XATTR); 266 vfs_setmntopt(zfsvfs->z_vfs, MNTOPT_NOXATTR, NULL, 0); 267 } 268} 269 270static void 271blksz_changed_cb(void *arg, uint64_t newval) 272{ 273 zfsvfs_t *zfsvfs = arg; 274 275 if (newval < SPA_MINBLOCKSIZE || 276 newval > SPA_MAXBLOCKSIZE || !ISP2(newval)) 277 newval = SPA_MAXBLOCKSIZE; 278 279 zfsvfs->z_max_blksz = newval; 280 zfsvfs->z_vfs->mnt_stat.f_iosize = newval; 281} 282 283static void 284readonly_changed_cb(void *arg, uint64_t newval) 285{ 286 zfsvfs_t *zfsvfs = arg; 287 288 if (newval) { 289 /* XXX locking on vfs_flag? */ 290 zfsvfs->z_vfs->vfs_flag |= VFS_RDONLY; 291 vfs_clearmntopt(zfsvfs->z_vfs, MNTOPT_RW); 292 vfs_setmntopt(zfsvfs->z_vfs, MNTOPT_RO, NULL, 0); 293 } else { 294 /* XXX locking on vfs_flag? */ 295 zfsvfs->z_vfs->vfs_flag &= ~VFS_RDONLY; 296 vfs_clearmntopt(zfsvfs->z_vfs, MNTOPT_RO); 297 vfs_setmntopt(zfsvfs->z_vfs, MNTOPT_RW, NULL, 0); 298 } 299} 300 301static void 302setuid_changed_cb(void *arg, uint64_t newval) 303{ 304 zfsvfs_t *zfsvfs = arg; 305 306 if (newval == FALSE) { 307 zfsvfs->z_vfs->vfs_flag |= VFS_NOSETUID; 308 vfs_clearmntopt(zfsvfs->z_vfs, MNTOPT_SETUID); 309 vfs_setmntopt(zfsvfs->z_vfs, MNTOPT_NOSETUID, NULL, 0); 310 } else { 311 zfsvfs->z_vfs->vfs_flag &= ~VFS_NOSETUID; 312 vfs_clearmntopt(zfsvfs->z_vfs, MNTOPT_NOSETUID); 313 vfs_setmntopt(zfsvfs->z_vfs, MNTOPT_SETUID, NULL, 0); 314 } 315} 316 317static void 318exec_changed_cb(void *arg, uint64_t newval) 319{ 320 zfsvfs_t *zfsvfs = arg; 321 322 if (newval == FALSE) { 323 zfsvfs->z_vfs->vfs_flag |= VFS_NOEXEC; 324 vfs_clearmntopt(zfsvfs->z_vfs, MNTOPT_EXEC); 325 vfs_setmntopt(zfsvfs->z_vfs, MNTOPT_NOEXEC, NULL, 0); 326 } else { 327 zfsvfs->z_vfs->vfs_flag &= ~VFS_NOEXEC; 328 vfs_clearmntopt(zfsvfs->z_vfs, MNTOPT_NOEXEC); 329 vfs_setmntopt(zfsvfs->z_vfs, MNTOPT_EXEC, NULL, 0); 330 } 331} 332 333/* 334 * The nbmand mount option can be changed at mount time. 335 * We can't allow it to be toggled on live file systems or incorrect 336 * behavior may be seen from cifs clients 337 * 338 * This property isn't registered via dsl_prop_register(), but this callback 339 * will be called when a file system is first mounted 340 */ 341static void 342nbmand_changed_cb(void *arg, uint64_t newval) 343{ 344 zfsvfs_t *zfsvfs = arg; 345 if (newval == FALSE) { 346 vfs_clearmntopt(zfsvfs->z_vfs, MNTOPT_NBMAND); 347 vfs_setmntopt(zfsvfs->z_vfs, MNTOPT_NONBMAND, NULL, 0); 348 } else { 349 vfs_clearmntopt(zfsvfs->z_vfs, MNTOPT_NONBMAND); 350 vfs_setmntopt(zfsvfs->z_vfs, MNTOPT_NBMAND, NULL, 0); 351 } 352} 353 354static void 355snapdir_changed_cb(void *arg, uint64_t newval) 356{ 357 zfsvfs_t *zfsvfs = arg; 358 359 zfsvfs->z_show_ctldir = newval; 360} 361 362static void 363vscan_changed_cb(void *arg, uint64_t newval) 364{ 365 zfsvfs_t *zfsvfs = arg; 366 367 zfsvfs->z_vscan = newval; 368} 369 370static void 371acl_mode_changed_cb(void *arg, uint64_t newval) 372{ 373 zfsvfs_t *zfsvfs = arg; 374 375 zfsvfs->z_acl_mode = newval; 376} 377 378static void 379acl_inherit_changed_cb(void *arg, uint64_t newval) 380{ 381 zfsvfs_t *zfsvfs = arg; 382 383 zfsvfs->z_acl_inherit = newval; 384} 385 386static int 387zfs_register_callbacks(vfs_t *vfsp) 388{ 389 struct dsl_dataset *ds = NULL; 390 objset_t *os = NULL; 391 zfsvfs_t *zfsvfs = NULL; 392 uint64_t nbmand; 393 boolean_t readonly = B_FALSE; 394 boolean_t do_readonly = B_FALSE; 395 boolean_t setuid = B_FALSE; 396 boolean_t do_setuid = B_FALSE; 397 boolean_t exec = B_FALSE; 398 boolean_t do_exec = B_FALSE; 399#ifdef illumos 400 boolean_t devices = B_FALSE; 401 boolean_t do_devices = B_FALSE; 402#endif 403 boolean_t xattr = B_FALSE; 404 boolean_t do_xattr = B_FALSE; 405 boolean_t atime = B_FALSE; 406 boolean_t do_atime = B_FALSE; 407 int error = 0; 408 409 ASSERT(vfsp); 410 zfsvfs = vfsp->vfs_data; 411 ASSERT(zfsvfs); 412 os = zfsvfs->z_os; 413 414 /* 415 * This function can be called for a snapshot when we update snapshot's 416 * mount point, which isn't really supported. 417 */ 418 if (dmu_objset_is_snapshot(os)) 419 return (EOPNOTSUPP); 420 421 /* 422 * The act of registering our callbacks will destroy any mount 423 * options we may have. In order to enable temporary overrides 424 * of mount options, we stash away the current values and 425 * restore them after we register the callbacks. 426 */ 427 if (vfs_optionisset(vfsp, MNTOPT_RO, NULL) || 428 !spa_writeable(dmu_objset_spa(os))) { 429 readonly = B_TRUE; 430 do_readonly = B_TRUE; 431 } else if (vfs_optionisset(vfsp, MNTOPT_RW, NULL)) { 432 readonly = B_FALSE; 433 do_readonly = B_TRUE; 434 } 435 if (vfs_optionisset(vfsp, MNTOPT_NOSUID, NULL)) { 436 setuid = B_FALSE; 437 do_setuid = B_TRUE; 438 } else { 439 if (vfs_optionisset(vfsp, MNTOPT_NOSETUID, NULL)) { 440 setuid = B_FALSE; 441 do_setuid = B_TRUE; 442 } else if (vfs_optionisset(vfsp, MNTOPT_SETUID, NULL)) { 443 setuid = B_TRUE; 444 do_setuid = B_TRUE; 445 } 446 } 447 if (vfs_optionisset(vfsp, MNTOPT_NOEXEC, NULL)) { 448 exec = B_FALSE; 449 do_exec = B_TRUE; 450 } else if (vfs_optionisset(vfsp, MNTOPT_EXEC, NULL)) { 451 exec = B_TRUE; 452 do_exec = B_TRUE; 453 } 454 if (vfs_optionisset(vfsp, MNTOPT_NOXATTR, NULL)) { 455 xattr = B_FALSE; 456 do_xattr = B_TRUE; 457 } else if (vfs_optionisset(vfsp, MNTOPT_XATTR, NULL)) { 458 xattr = B_TRUE; 459 do_xattr = B_TRUE; 460 } 461 if (vfs_optionisset(vfsp, MNTOPT_NOATIME, NULL)) { 462 atime = B_FALSE; 463 do_atime = B_TRUE; 464 } else if (vfs_optionisset(vfsp, MNTOPT_ATIME, NULL)) { 465 atime = B_TRUE; 466 do_atime = B_TRUE; 467 } 468 469 /* 470 * nbmand is a special property. It can only be changed at 471 * mount time. 472 * 473 * This is weird, but it is documented to only be changeable 474 * at mount time. 475 */ 476 if (vfs_optionisset(vfsp, MNTOPT_NONBMAND, NULL)) { 477 nbmand = B_FALSE; 478 } else if (vfs_optionisset(vfsp, MNTOPT_NBMAND, NULL)) { 479 nbmand = B_TRUE; 480 } else { 481 char osname[MAXNAMELEN]; 482 483 dmu_objset_name(os, osname); 484 if (error = dsl_prop_get_integer(osname, "nbmand", &nbmand, 485 NULL)) { 486 return (error); 487 } 488 } 489 490 /* 491 * Register property callbacks. 492 * 493 * It would probably be fine to just check for i/o error from 494 * the first prop_register(), but I guess I like to go 495 * overboard... 496 */ 497 ds = dmu_objset_ds(os); 498 dsl_pool_config_enter(dmu_objset_pool(os), FTAG); 499 error = dsl_prop_register(ds, 500 zfs_prop_to_name(ZFS_PROP_ATIME), atime_changed_cb, zfsvfs); 501 error = error ? error : dsl_prop_register(ds, 502 zfs_prop_to_name(ZFS_PROP_XATTR), xattr_changed_cb, zfsvfs); 503 error = error ? error : dsl_prop_register(ds, 504 zfs_prop_to_name(ZFS_PROP_RECORDSIZE), blksz_changed_cb, zfsvfs); 505 error = error ? error : dsl_prop_register(ds, 506 zfs_prop_to_name(ZFS_PROP_READONLY), readonly_changed_cb, zfsvfs); 507#ifdef illumos 508 error = error ? error : dsl_prop_register(ds, 509 zfs_prop_to_name(ZFS_PROP_DEVICES), devices_changed_cb, zfsvfs); 510#endif 511 error = error ? error : dsl_prop_register(ds, 512 zfs_prop_to_name(ZFS_PROP_SETUID), setuid_changed_cb, zfsvfs); 513 error = error ? error : dsl_prop_register(ds, 514 zfs_prop_to_name(ZFS_PROP_EXEC), exec_changed_cb, zfsvfs); 515 error = error ? error : dsl_prop_register(ds, 516 zfs_prop_to_name(ZFS_PROP_SNAPDIR), snapdir_changed_cb, zfsvfs); 517 error = error ? error : dsl_prop_register(ds, 518 zfs_prop_to_name(ZFS_PROP_ACLMODE), acl_mode_changed_cb, zfsvfs); 519 error = error ? error : dsl_prop_register(ds, 520 zfs_prop_to_name(ZFS_PROP_ACLINHERIT), acl_inherit_changed_cb, 521 zfsvfs); 522 error = error ? error : dsl_prop_register(ds, 523 zfs_prop_to_name(ZFS_PROP_VSCAN), vscan_changed_cb, zfsvfs); 524 dsl_pool_config_exit(dmu_objset_pool(os), FTAG); 525 if (error) 526 goto unregister; 527 528 /* 529 * Invoke our callbacks to restore temporary mount options. 530 */ 531 if (do_readonly) 532 readonly_changed_cb(zfsvfs, readonly); 533 if (do_setuid) 534 setuid_changed_cb(zfsvfs, setuid); 535 if (do_exec) 536 exec_changed_cb(zfsvfs, exec); 537 if (do_xattr) 538 xattr_changed_cb(zfsvfs, xattr); 539 if (do_atime) 540 atime_changed_cb(zfsvfs, atime); 541 542 nbmand_changed_cb(zfsvfs, nbmand); 543 544 return (0); 545 546unregister: 547 /* 548 * We may attempt to unregister some callbacks that are not 549 * registered, but this is OK; it will simply return ENOMSG, 550 * which we will ignore. 551 */ 552 (void) dsl_prop_unregister(ds, zfs_prop_to_name(ZFS_PROP_ATIME), 553 atime_changed_cb, zfsvfs); 554 (void) dsl_prop_unregister(ds, zfs_prop_to_name(ZFS_PROP_XATTR), 555 xattr_changed_cb, zfsvfs); 556 (void) dsl_prop_unregister(ds, zfs_prop_to_name(ZFS_PROP_RECORDSIZE), 557 blksz_changed_cb, zfsvfs); 558 (void) dsl_prop_unregister(ds, zfs_prop_to_name(ZFS_PROP_READONLY), 559 readonly_changed_cb, zfsvfs); 560#ifdef illumos 561 (void) dsl_prop_unregister(ds, zfs_prop_to_name(ZFS_PROP_DEVICES), 562 devices_changed_cb, zfsvfs); 563#endif 564 (void) dsl_prop_unregister(ds, zfs_prop_to_name(ZFS_PROP_SETUID), 565 setuid_changed_cb, zfsvfs); 566 (void) dsl_prop_unregister(ds, zfs_prop_to_name(ZFS_PROP_EXEC), 567 exec_changed_cb, zfsvfs); 568 (void) dsl_prop_unregister(ds, zfs_prop_to_name(ZFS_PROP_SNAPDIR), 569 snapdir_changed_cb, zfsvfs); 570 (void) dsl_prop_unregister(ds, zfs_prop_to_name(ZFS_PROP_ACLMODE), 571 acl_mode_changed_cb, zfsvfs); 572 (void) dsl_prop_unregister(ds, zfs_prop_to_name(ZFS_PROP_ACLINHERIT), 573 acl_inherit_changed_cb, zfsvfs); 574 (void) dsl_prop_unregister(ds, zfs_prop_to_name(ZFS_PROP_VSCAN), 575 vscan_changed_cb, zfsvfs); 576 return (error); 577} 578 579static int 580zfs_space_delta_cb(dmu_object_type_t bonustype, void *data, 581 uint64_t *userp, uint64_t *groupp) 582{ 583 /* 584 * Is it a valid type of object to track? 585 */ 586 if (bonustype != DMU_OT_ZNODE && bonustype != DMU_OT_SA) 587 return (SET_ERROR(ENOENT)); 588 589 /* 590 * If we have a NULL data pointer 591 * then assume the id's aren't changing and 592 * return EEXIST to the dmu to let it know to 593 * use the same ids 594 */ 595 if (data == NULL) 596 return (SET_ERROR(EEXIST)); 597 598 if (bonustype == DMU_OT_ZNODE) { 599 znode_phys_t *znp = data; 600 *userp = znp->zp_uid; 601 *groupp = znp->zp_gid; 602 } else { 603 int hdrsize; 604 sa_hdr_phys_t *sap = data; 605 sa_hdr_phys_t sa = *sap; 606 boolean_t swap = B_FALSE; 607 608 ASSERT(bonustype == DMU_OT_SA); 609 610 if (sa.sa_magic == 0) { 611 /* 612 * This should only happen for newly created 613 * files that haven't had the znode data filled 614 * in yet. 615 */ 616 *userp = 0; 617 *groupp = 0; 618 return (0); 619 } 620 if (sa.sa_magic == BSWAP_32(SA_MAGIC)) { 621 sa.sa_magic = SA_MAGIC; 622 sa.sa_layout_info = BSWAP_16(sa.sa_layout_info); 623 swap = B_TRUE; 624 } else { 625 VERIFY3U(sa.sa_magic, ==, SA_MAGIC); 626 } 627 628 hdrsize = sa_hdrsize(&sa); 629 VERIFY3U(hdrsize, >=, sizeof (sa_hdr_phys_t)); 630 *userp = *((uint64_t *)((uintptr_t)data + hdrsize + 631 SA_UID_OFFSET)); 632 *groupp = *((uint64_t *)((uintptr_t)data + hdrsize + 633 SA_GID_OFFSET)); 634 if (swap) { 635 *userp = BSWAP_64(*userp); 636 *groupp = BSWAP_64(*groupp); 637 } 638 } 639 return (0); 640} 641 642static void 643fuidstr_to_sid(zfsvfs_t *zfsvfs, const char *fuidstr, 644 char *domainbuf, int buflen, uid_t *ridp) 645{ 646 uint64_t fuid; 647 const char *domain; 648 649 fuid = strtonum(fuidstr, NULL); 650 651 domain = zfs_fuid_find_by_idx(zfsvfs, FUID_INDEX(fuid)); 652 if (domain) 653 (void) strlcpy(domainbuf, domain, buflen); 654 else 655 domainbuf[0] = '\0'; 656 *ridp = FUID_RID(fuid); 657} 658 659static uint64_t 660zfs_userquota_prop_to_obj(zfsvfs_t *zfsvfs, zfs_userquota_prop_t type) 661{ 662 switch (type) { 663 case ZFS_PROP_USERUSED: 664 return (DMU_USERUSED_OBJECT); 665 case ZFS_PROP_GROUPUSED: 666 return (DMU_GROUPUSED_OBJECT); 667 case ZFS_PROP_USERQUOTA: 668 return (zfsvfs->z_userquota_obj); 669 case ZFS_PROP_GROUPQUOTA: 670 return (zfsvfs->z_groupquota_obj); 671 } 672 return (0); 673} 674 675int 676zfs_userspace_many(zfsvfs_t *zfsvfs, zfs_userquota_prop_t type, 677 uint64_t *cookiep, void *vbuf, uint64_t *bufsizep) 678{ 679 int error; 680 zap_cursor_t zc; 681 zap_attribute_t za; 682 zfs_useracct_t *buf = vbuf; 683 uint64_t obj; 684 685 if (!dmu_objset_userspace_present(zfsvfs->z_os)) 686 return (SET_ERROR(ENOTSUP)); 687 688 obj = zfs_userquota_prop_to_obj(zfsvfs, type); 689 if (obj == 0) { 690 *bufsizep = 0; 691 return (0); 692 } 693 694 for (zap_cursor_init_serialized(&zc, zfsvfs->z_os, obj, *cookiep); 695 (error = zap_cursor_retrieve(&zc, &za)) == 0; 696 zap_cursor_advance(&zc)) { 697 if ((uintptr_t)buf - (uintptr_t)vbuf + sizeof (zfs_useracct_t) > 698 *bufsizep) 699 break; 700 701 fuidstr_to_sid(zfsvfs, za.za_name, 702 buf->zu_domain, sizeof (buf->zu_domain), &buf->zu_rid); 703 704 buf->zu_space = za.za_first_integer; 705 buf++; 706 } 707 if (error == ENOENT) 708 error = 0; 709 710 ASSERT3U((uintptr_t)buf - (uintptr_t)vbuf, <=, *bufsizep); 711 *bufsizep = (uintptr_t)buf - (uintptr_t)vbuf; 712 *cookiep = zap_cursor_serialize(&zc); 713 zap_cursor_fini(&zc); 714 return (error); 715} 716 717/* 718 * buf must be big enough (eg, 32 bytes) 719 */ 720static int 721id_to_fuidstr(zfsvfs_t *zfsvfs, const char *domain, uid_t rid, 722 char *buf, boolean_t addok) 723{ 724 uint64_t fuid; 725 int domainid = 0; 726 727 if (domain && domain[0]) { 728 domainid = zfs_fuid_find_by_domain(zfsvfs, domain, NULL, addok); 729 if (domainid == -1) 730 return (SET_ERROR(ENOENT)); 731 } 732 fuid = FUID_ENCODE(domainid, rid); 733 (void) sprintf(buf, "%llx", (longlong_t)fuid); 734 return (0); 735} 736 737int 738zfs_userspace_one(zfsvfs_t *zfsvfs, zfs_userquota_prop_t type, 739 const char *domain, uint64_t rid, uint64_t *valp) 740{ 741 char buf[32]; 742 int err; 743 uint64_t obj; 744 745 *valp = 0; 746 747 if (!dmu_objset_userspace_present(zfsvfs->z_os)) 748 return (SET_ERROR(ENOTSUP)); 749 750 obj = zfs_userquota_prop_to_obj(zfsvfs, type); 751 if (obj == 0) 752 return (0); 753 754 err = id_to_fuidstr(zfsvfs, domain, rid, buf, B_FALSE); 755 if (err) 756 return (err); 757 758 err = zap_lookup(zfsvfs->z_os, obj, buf, 8, 1, valp); 759 if (err == ENOENT) 760 err = 0; 761 return (err); 762} 763 764int 765zfs_set_userquota(zfsvfs_t *zfsvfs, zfs_userquota_prop_t type, 766 const char *domain, uint64_t rid, uint64_t quota) 767{ 768 char buf[32]; 769 int err; 770 dmu_tx_t *tx; 771 uint64_t *objp; 772 boolean_t fuid_dirtied; 773 774 if (type != ZFS_PROP_USERQUOTA && type != ZFS_PROP_GROUPQUOTA) 775 return (SET_ERROR(EINVAL)); 776 777 if (zfsvfs->z_version < ZPL_VERSION_USERSPACE) 778 return (SET_ERROR(ENOTSUP)); 779 780 objp = (type == ZFS_PROP_USERQUOTA) ? &zfsvfs->z_userquota_obj : 781 &zfsvfs->z_groupquota_obj; 782 783 err = id_to_fuidstr(zfsvfs, domain, rid, buf, B_TRUE); 784 if (err) 785 return (err); 786 fuid_dirtied = zfsvfs->z_fuid_dirty; 787 788 tx = dmu_tx_create(zfsvfs->z_os); 789 dmu_tx_hold_zap(tx, *objp ? *objp : DMU_NEW_OBJECT, B_TRUE, NULL); 790 if (*objp == 0) { 791 dmu_tx_hold_zap(tx, MASTER_NODE_OBJ, B_TRUE, 792 zfs_userquota_prop_prefixes[type]); 793 } 794 if (fuid_dirtied) 795 zfs_fuid_txhold(zfsvfs, tx); 796 err = dmu_tx_assign(tx, TXG_WAIT); 797 if (err) { 798 dmu_tx_abort(tx); 799 return (err); 800 } 801 802 mutex_enter(&zfsvfs->z_lock); 803 if (*objp == 0) { 804 *objp = zap_create(zfsvfs->z_os, DMU_OT_USERGROUP_QUOTA, 805 DMU_OT_NONE, 0, tx); 806 VERIFY(0 == zap_add(zfsvfs->z_os, MASTER_NODE_OBJ, 807 zfs_userquota_prop_prefixes[type], 8, 1, objp, tx)); 808 } 809 mutex_exit(&zfsvfs->z_lock); 810 811 if (quota == 0) { 812 err = zap_remove(zfsvfs->z_os, *objp, buf, tx); 813 if (err == ENOENT) 814 err = 0; 815 } else { 816 err = zap_update(zfsvfs->z_os, *objp, buf, 8, 1, "a, tx); 817 } 818 ASSERT(err == 0); 819 if (fuid_dirtied) 820 zfs_fuid_sync(zfsvfs, tx); 821 dmu_tx_commit(tx); 822 return (err); 823} 824 825boolean_t 826zfs_fuid_overquota(zfsvfs_t *zfsvfs, boolean_t isgroup, uint64_t fuid) 827{ 828 char buf[32]; 829 uint64_t used, quota, usedobj, quotaobj; 830 int err; 831 832 usedobj = isgroup ? DMU_GROUPUSED_OBJECT : DMU_USERUSED_OBJECT; 833 quotaobj = isgroup ? zfsvfs->z_groupquota_obj : zfsvfs->z_userquota_obj; 834 835 if (quotaobj == 0 || zfsvfs->z_replay) 836 return (B_FALSE); 837 838 (void) sprintf(buf, "%llx", (longlong_t)fuid); 839 err = zap_lookup(zfsvfs->z_os, quotaobj, buf, 8, 1, "a); 840 if (err != 0) 841 return (B_FALSE); 842 843 err = zap_lookup(zfsvfs->z_os, usedobj, buf, 8, 1, &used); 844 if (err != 0) 845 return (B_FALSE); 846 return (used >= quota); 847} 848 849boolean_t 850zfs_owner_overquota(zfsvfs_t *zfsvfs, znode_t *zp, boolean_t isgroup) 851{ 852 uint64_t fuid; 853 uint64_t quotaobj; 854 855 quotaobj = isgroup ? zfsvfs->z_groupquota_obj : zfsvfs->z_userquota_obj; 856 857 fuid = isgroup ? zp->z_gid : zp->z_uid; 858 859 if (quotaobj == 0 || zfsvfs->z_replay) 860 return (B_FALSE); 861 862 return (zfs_fuid_overquota(zfsvfs, isgroup, fuid)); 863} 864 865int 866zfsvfs_create(const char *osname, zfsvfs_t **zfvp) 867{ 868 objset_t *os; 869 zfsvfs_t *zfsvfs; 870 uint64_t zval; 871 int i, error; 872 uint64_t sa_obj; 873 874 zfsvfs = kmem_zalloc(sizeof (zfsvfs_t), KM_SLEEP); 875 876 /* 877 * We claim to always be readonly so we can open snapshots; 878 * other ZPL code will prevent us from writing to snapshots. 879 */ 880 error = dmu_objset_own(osname, DMU_OST_ZFS, B_TRUE, zfsvfs, &os); 881 if (error) { 882 kmem_free(zfsvfs, sizeof (zfsvfs_t)); 883 return (error); 884 } 885 886 /* 887 * Initialize the zfs-specific filesystem structure. 888 * Should probably make this a kmem cache, shuffle fields, 889 * and just bzero up to z_hold_mtx[]. 890 */ 891 zfsvfs->z_vfs = NULL; 892 zfsvfs->z_parent = zfsvfs; 893 zfsvfs->z_max_blksz = SPA_MAXBLOCKSIZE; 894 zfsvfs->z_show_ctldir = ZFS_SNAPDIR_VISIBLE; 895 zfsvfs->z_os = os; 896 897 error = zfs_get_zplprop(os, ZFS_PROP_VERSION, &zfsvfs->z_version); 898 if (error) { 899 goto out; 900 } else if (zfsvfs->z_version > 901 zfs_zpl_version_map(spa_version(dmu_objset_spa(os)))) { 902 (void) printf("Can't mount a version %lld file system " 903 "on a version %lld pool\n. Pool must be upgraded to mount " 904 "this file system.", (u_longlong_t)zfsvfs->z_version, 905 (u_longlong_t)spa_version(dmu_objset_spa(os))); 906 error = SET_ERROR(ENOTSUP); 907 goto out; 908 } 909 if ((error = zfs_get_zplprop(os, ZFS_PROP_NORMALIZE, &zval)) != 0) 910 goto out; 911 zfsvfs->z_norm = (int)zval; 912 913 if ((error = zfs_get_zplprop(os, ZFS_PROP_UTF8ONLY, &zval)) != 0) 914 goto out; 915 zfsvfs->z_utf8 = (zval != 0); 916 917 if ((error = zfs_get_zplprop(os, ZFS_PROP_CASE, &zval)) != 0) 918 goto out; 919 zfsvfs->z_case = (uint_t)zval; 920 921 /* 922 * Fold case on file systems that are always or sometimes case 923 * insensitive. 924 */ 925 if (zfsvfs->z_case == ZFS_CASE_INSENSITIVE || 926 zfsvfs->z_case == ZFS_CASE_MIXED) 927 zfsvfs->z_norm |= U8_TEXTPREP_TOUPPER; 928 929 zfsvfs->z_use_fuids = USE_FUIDS(zfsvfs->z_version, zfsvfs->z_os); 930 zfsvfs->z_use_sa = USE_SA(zfsvfs->z_version, zfsvfs->z_os); 931 932 if (zfsvfs->z_use_sa) { 933 /* should either have both of these objects or none */ 934 error = zap_lookup(os, MASTER_NODE_OBJ, ZFS_SA_ATTRS, 8, 1, 935 &sa_obj); 936 if (error) 937 return (error); 938 } else { 939 /* 940 * Pre SA versions file systems should never touch 941 * either the attribute registration or layout objects. 942 */ 943 sa_obj = 0; 944 } 945 946 error = sa_setup(os, sa_obj, zfs_attr_table, ZPL_END, 947 &zfsvfs->z_attr_table); 948 if (error) 949 goto out; 950 951 if (zfsvfs->z_version >= ZPL_VERSION_SA) 952 sa_register_update_callback(os, zfs_sa_upgrade); 953 954 error = zap_lookup(os, MASTER_NODE_OBJ, ZFS_ROOT_OBJ, 8, 1, 955 &zfsvfs->z_root); 956 if (error) 957 goto out; 958 ASSERT(zfsvfs->z_root != 0); 959 960 error = zap_lookup(os, MASTER_NODE_OBJ, ZFS_UNLINKED_SET, 8, 1, 961 &zfsvfs->z_unlinkedobj); 962 if (error) 963 goto out; 964 965 error = zap_lookup(os, MASTER_NODE_OBJ, 966 zfs_userquota_prop_prefixes[ZFS_PROP_USERQUOTA], 967 8, 1, &zfsvfs->z_userquota_obj); 968 if (error && error != ENOENT) 969 goto out; 970 971 error = zap_lookup(os, MASTER_NODE_OBJ, 972 zfs_userquota_prop_prefixes[ZFS_PROP_GROUPQUOTA], 973 8, 1, &zfsvfs->z_groupquota_obj); 974 if (error && error != ENOENT) 975 goto out; 976 977 error = zap_lookup(os, MASTER_NODE_OBJ, ZFS_FUID_TABLES, 8, 1, 978 &zfsvfs->z_fuid_obj); 979 if (error && error != ENOENT) 980 goto out; 981 982 error = zap_lookup(os, MASTER_NODE_OBJ, ZFS_SHARES_DIR, 8, 1, 983 &zfsvfs->z_shares_dir); 984 if (error && error != ENOENT) 985 goto out; 986 987 mutex_init(&zfsvfs->z_znodes_lock, NULL, MUTEX_DEFAULT, NULL); 988 mutex_init(&zfsvfs->z_lock, NULL, MUTEX_DEFAULT, NULL); 989 list_create(&zfsvfs->z_all_znodes, sizeof (znode_t), 990 offsetof(znode_t, z_link_node)); 991 rrw_init(&zfsvfs->z_teardown_lock, B_FALSE); 992 rw_init(&zfsvfs->z_teardown_inactive_lock, NULL, RW_DEFAULT, NULL); 993 rw_init(&zfsvfs->z_fuid_lock, NULL, RW_DEFAULT, NULL); 994 for (i = 0; i != ZFS_OBJ_MTX_SZ; i++) 995 mutex_init(&zfsvfs->z_hold_mtx[i], NULL, MUTEX_DEFAULT, NULL); 996 997 *zfvp = zfsvfs; 998 return (0); 999 1000out: 1001 dmu_objset_disown(os, zfsvfs); 1002 *zfvp = NULL; 1003 kmem_free(zfsvfs, sizeof (zfsvfs_t)); 1004 return (error); 1005} 1006 1007static int 1008zfsvfs_setup(zfsvfs_t *zfsvfs, boolean_t mounting) 1009{ 1010 int error; 1011 1012 error = zfs_register_callbacks(zfsvfs->z_vfs); 1013 if (error) 1014 return (error); 1015 1016 /* 1017 * Set the objset user_ptr to track its zfsvfs. 1018 */ 1019 mutex_enter(&zfsvfs->z_os->os_user_ptr_lock); 1020 dmu_objset_set_user(zfsvfs->z_os, zfsvfs); 1021 mutex_exit(&zfsvfs->z_os->os_user_ptr_lock); 1022 1023 zfsvfs->z_log = zil_open(zfsvfs->z_os, zfs_get_data); 1024 1025 /* 1026 * If we are not mounting (ie: online recv), then we don't 1027 * have to worry about replaying the log as we blocked all 1028 * operations out since we closed the ZIL. 1029 */ 1030 if (mounting) { 1031 boolean_t readonly; 1032 1033 /* 1034 * During replay we remove the read only flag to 1035 * allow replays to succeed. 1036 */ 1037 readonly = zfsvfs->z_vfs->vfs_flag & VFS_RDONLY; 1038 if (readonly != 0) 1039 zfsvfs->z_vfs->vfs_flag &= ~VFS_RDONLY; 1040 else 1041 zfs_unlinked_drain(zfsvfs); 1042 1043 /* 1044 * Parse and replay the intent log. 1045 * 1046 * Because of ziltest, this must be done after 1047 * zfs_unlinked_drain(). (Further note: ziltest 1048 * doesn't use readonly mounts, where 1049 * zfs_unlinked_drain() isn't called.) This is because 1050 * ziltest causes spa_sync() to think it's committed, 1051 * but actually it is not, so the intent log contains 1052 * many txg's worth of changes. 1053 * 1054 * In particular, if object N is in the unlinked set in 1055 * the last txg to actually sync, then it could be 1056 * actually freed in a later txg and then reallocated 1057 * in a yet later txg. This would write a "create 1058 * object N" record to the intent log. Normally, this 1059 * would be fine because the spa_sync() would have 1060 * written out the fact that object N is free, before 1061 * we could write the "create object N" intent log 1062 * record. 1063 * 1064 * But when we are in ziltest mode, we advance the "open 1065 * txg" without actually spa_sync()-ing the changes to 1066 * disk. So we would see that object N is still 1067 * allocated and in the unlinked set, and there is an 1068 * intent log record saying to allocate it. 1069 */ 1070 if (spa_writeable(dmu_objset_spa(zfsvfs->z_os))) { 1071 if (zil_replay_disable) { 1072 zil_destroy(zfsvfs->z_log, B_FALSE); 1073 } else { 1074 zfsvfs->z_replay = B_TRUE; 1075 zil_replay(zfsvfs->z_os, zfsvfs, 1076 zfs_replay_vector); 1077 zfsvfs->z_replay = B_FALSE; 1078 } 1079 } 1080 zfsvfs->z_vfs->vfs_flag |= readonly; /* restore readonly bit */ 1081 } 1082 1083 return (0); 1084} 1085 1086extern krwlock_t zfsvfs_lock; /* in zfs_znode.c */ 1087 1088void 1089zfsvfs_free(zfsvfs_t *zfsvfs) 1090{ 1091 int i; 1092 1093 /* 1094 * This is a barrier to prevent the filesystem from going away in 1095 * zfs_znode_move() until we can safely ensure that the filesystem is 1096 * not unmounted. We consider the filesystem valid before the barrier 1097 * and invalid after the barrier. 1098 */ 1099 rw_enter(&zfsvfs_lock, RW_READER); 1100 rw_exit(&zfsvfs_lock); 1101 1102 zfs_fuid_destroy(zfsvfs); 1103 1104 mutex_destroy(&zfsvfs->z_znodes_lock); 1105 mutex_destroy(&zfsvfs->z_lock); 1106 list_destroy(&zfsvfs->z_all_znodes); 1107 rrw_destroy(&zfsvfs->z_teardown_lock); 1108 rw_destroy(&zfsvfs->z_teardown_inactive_lock); 1109 rw_destroy(&zfsvfs->z_fuid_lock); 1110 for (i = 0; i != ZFS_OBJ_MTX_SZ; i++) 1111 mutex_destroy(&zfsvfs->z_hold_mtx[i]); 1112 kmem_free(zfsvfs, sizeof (zfsvfs_t)); 1113} 1114 1115static void 1116zfs_set_fuid_feature(zfsvfs_t *zfsvfs) 1117{ 1118 zfsvfs->z_use_fuids = USE_FUIDS(zfsvfs->z_version, zfsvfs->z_os); 1119 if (zfsvfs->z_vfs) { 1120 if (zfsvfs->z_use_fuids) { 1121 vfs_set_feature(zfsvfs->z_vfs, VFSFT_XVATTR); 1122 vfs_set_feature(zfsvfs->z_vfs, VFSFT_SYSATTR_VIEWS); 1123 vfs_set_feature(zfsvfs->z_vfs, VFSFT_ACEMASKONACCESS); 1124 vfs_set_feature(zfsvfs->z_vfs, VFSFT_ACLONCREATE); 1125 vfs_set_feature(zfsvfs->z_vfs, VFSFT_ACCESS_FILTER); 1126 vfs_set_feature(zfsvfs->z_vfs, VFSFT_REPARSE); 1127 } else { 1128 vfs_clear_feature(zfsvfs->z_vfs, VFSFT_XVATTR); 1129 vfs_clear_feature(zfsvfs->z_vfs, VFSFT_SYSATTR_VIEWS); 1130 vfs_clear_feature(zfsvfs->z_vfs, VFSFT_ACEMASKONACCESS); 1131 vfs_clear_feature(zfsvfs->z_vfs, VFSFT_ACLONCREATE); 1132 vfs_clear_feature(zfsvfs->z_vfs, VFSFT_ACCESS_FILTER); 1133 vfs_clear_feature(zfsvfs->z_vfs, VFSFT_REPARSE); 1134 } 1135 } 1136 zfsvfs->z_use_sa = USE_SA(zfsvfs->z_version, zfsvfs->z_os); 1137} 1138 1139static int 1140zfs_domount(vfs_t *vfsp, char *osname) 1141{ 1142 uint64_t recordsize, fsid_guid; 1143 int error = 0; 1144 zfsvfs_t *zfsvfs; 1145 vnode_t *vp; 1146 1147 ASSERT(vfsp); 1148 ASSERT(osname); 1149 1150 error = zfsvfs_create(osname, &zfsvfs); 1151 if (error) 1152 return (error); 1153 zfsvfs->z_vfs = vfsp; 1154 1155#ifdef illumos 1156 /* Initialize the generic filesystem structure. */ 1157 vfsp->vfs_bcount = 0; 1158 vfsp->vfs_data = NULL; 1159 1160 if (zfs_create_unique_device(&mount_dev) == -1) { 1161 error = SET_ERROR(ENODEV); 1162 goto out; 1163 } 1164 ASSERT(vfs_devismounted(mount_dev) == 0); 1165#endif 1166 1167 if (error = dsl_prop_get_integer(osname, "recordsize", &recordsize, 1168 NULL)) 1169 goto out; 1170 zfsvfs->z_vfs->vfs_bsize = SPA_MINBLOCKSIZE; 1171 zfsvfs->z_vfs->mnt_stat.f_iosize = recordsize; 1172 1173 vfsp->vfs_data = zfsvfs; 1174 vfsp->mnt_flag |= MNT_LOCAL; 1175 vfsp->mnt_kern_flag |= MNTK_MPSAFE; 1176 vfsp->mnt_kern_flag |= MNTK_LOOKUP_SHARED; 1177 vfsp->mnt_kern_flag |= MNTK_SHARED_WRITES; 1178 vfsp->mnt_kern_flag |= MNTK_EXTENDED_SHARED; 1179 1180 /* 1181 * The fsid is 64 bits, composed of an 8-bit fs type, which 1182 * separates our fsid from any other filesystem types, and a 1183 * 56-bit objset unique ID. The objset unique ID is unique to 1184 * all objsets open on this system, provided by unique_create(). 1185 * The 8-bit fs type must be put in the low bits of fsid[1] 1186 * because that's where other Solaris filesystems put it. 1187 */ 1188 fsid_guid = dmu_objset_fsid_guid(zfsvfs->z_os); 1189 ASSERT((fsid_guid & ~((1ULL<<56)-1)) == 0); 1190 vfsp->vfs_fsid.val[0] = fsid_guid; 1191 vfsp->vfs_fsid.val[1] = ((fsid_guid>>32) << 8) | 1192 vfsp->mnt_vfc->vfc_typenum & 0xFF; 1193 1194 /* 1195 * Set features for file system. 1196 */ 1197 zfs_set_fuid_feature(zfsvfs); 1198 if (zfsvfs->z_case == ZFS_CASE_INSENSITIVE) { 1199 vfs_set_feature(vfsp, VFSFT_DIRENTFLAGS); 1200 vfs_set_feature(vfsp, VFSFT_CASEINSENSITIVE); 1201 vfs_set_feature(vfsp, VFSFT_NOCASESENSITIVE); 1202 } else if (zfsvfs->z_case == ZFS_CASE_MIXED) { 1203 vfs_set_feature(vfsp, VFSFT_DIRENTFLAGS); 1204 vfs_set_feature(vfsp, VFSFT_CASEINSENSITIVE); 1205 } 1206 vfs_set_feature(vfsp, VFSFT_ZEROCOPY_SUPPORTED); 1207 1208 if (dmu_objset_is_snapshot(zfsvfs->z_os)) { 1209 uint64_t pval; 1210 1211 atime_changed_cb(zfsvfs, B_FALSE); 1212 readonly_changed_cb(zfsvfs, B_TRUE); 1213 if (error = dsl_prop_get_integer(osname, "xattr", &pval, NULL)) 1214 goto out; 1215 xattr_changed_cb(zfsvfs, pval); 1216 zfsvfs->z_issnap = B_TRUE; 1217 zfsvfs->z_os->os_sync = ZFS_SYNC_DISABLED; 1218 1219 mutex_enter(&zfsvfs->z_os->os_user_ptr_lock); 1220 dmu_objset_set_user(zfsvfs->z_os, zfsvfs); 1221 mutex_exit(&zfsvfs->z_os->os_user_ptr_lock); 1222 } else { 1223 error = zfsvfs_setup(zfsvfs, B_TRUE); 1224 } 1225 1226 vfs_mountedfrom(vfsp, osname); 1227 /* Grab extra reference. */ 1228 VERIFY(VFS_ROOT(vfsp, LK_EXCLUSIVE, &vp) == 0); 1229 VOP_UNLOCK(vp, 0); 1230 1231 if (!zfsvfs->z_issnap) 1232 zfsctl_create(zfsvfs); 1233out: 1234 if (error) { 1235 dmu_objset_disown(zfsvfs->z_os, zfsvfs); 1236 zfsvfs_free(zfsvfs); 1237 } else { 1238 atomic_add_32(&zfs_active_fs_count, 1); 1239 } 1240 1241 return (error); 1242} 1243 1244void 1245zfs_unregister_callbacks(zfsvfs_t *zfsvfs) 1246{ 1247 objset_t *os = zfsvfs->z_os; 1248 struct dsl_dataset *ds; 1249 1250 /* 1251 * Unregister properties. 1252 */ 1253 if (!dmu_objset_is_snapshot(os)) { 1254 ds = dmu_objset_ds(os); 1255 VERIFY(dsl_prop_unregister(ds, "atime", atime_changed_cb, 1256 zfsvfs) == 0); 1257 1258 VERIFY(dsl_prop_unregister(ds, "xattr", xattr_changed_cb, 1259 zfsvfs) == 0); 1260 1261 VERIFY(dsl_prop_unregister(ds, "recordsize", blksz_changed_cb, 1262 zfsvfs) == 0); 1263 1264 VERIFY(dsl_prop_unregister(ds, "readonly", readonly_changed_cb, 1265 zfsvfs) == 0); 1266 1267 VERIFY(dsl_prop_unregister(ds, "setuid", setuid_changed_cb, 1268 zfsvfs) == 0); 1269 1270 VERIFY(dsl_prop_unregister(ds, "exec", exec_changed_cb, 1271 zfsvfs) == 0); 1272 1273 VERIFY(dsl_prop_unregister(ds, "snapdir", snapdir_changed_cb, 1274 zfsvfs) == 0); 1275 1276 VERIFY(dsl_prop_unregister(ds, "aclmode", acl_mode_changed_cb, 1277 zfsvfs) == 0); 1278 1279 VERIFY(dsl_prop_unregister(ds, "aclinherit", 1280 acl_inherit_changed_cb, zfsvfs) == 0); 1281 1282 VERIFY(dsl_prop_unregister(ds, "vscan", 1283 vscan_changed_cb, zfsvfs) == 0); 1284 } 1285} 1286 1287#ifdef SECLABEL 1288/* 1289 * Convert a decimal digit string to a uint64_t integer. 1290 */ 1291static int 1292str_to_uint64(char *str, uint64_t *objnum) 1293{ 1294 uint64_t num = 0; 1295 1296 while (*str) { 1297 if (*str < '0' || *str > '9') 1298 return (SET_ERROR(EINVAL)); 1299 1300 num = num*10 + *str++ - '0'; 1301 } 1302 1303 *objnum = num; 1304 return (0); 1305} 1306 1307/* 1308 * The boot path passed from the boot loader is in the form of 1309 * "rootpool-name/root-filesystem-object-number'. Convert this 1310 * string to a dataset name: "rootpool-name/root-filesystem-name". 1311 */ 1312static int 1313zfs_parse_bootfs(char *bpath, char *outpath) 1314{ 1315 char *slashp; 1316 uint64_t objnum; 1317 int error; 1318 1319 if (*bpath == 0 || *bpath == '/') 1320 return (SET_ERROR(EINVAL)); 1321 1322 (void) strcpy(outpath, bpath); 1323 1324 slashp = strchr(bpath, '/'); 1325 1326 /* if no '/', just return the pool name */ 1327 if (slashp == NULL) { 1328 return (0); 1329 } 1330 1331 /* if not a number, just return the root dataset name */ 1332 if (str_to_uint64(slashp+1, &objnum)) { 1333 return (0); 1334 } 1335 1336 *slashp = '\0'; 1337 error = dsl_dsobj_to_dsname(bpath, objnum, outpath); 1338 *slashp = '/'; 1339 1340 return (error); 1341} 1342 1343/* 1344 * Check that the hex label string is appropriate for the dataset being 1345 * mounted into the global_zone proper. 1346 * 1347 * Return an error if the hex label string is not default or 1348 * admin_low/admin_high. For admin_low labels, the corresponding 1349 * dataset must be readonly. 1350 */ 1351int 1352zfs_check_global_label(const char *dsname, const char *hexsl) 1353{ 1354 if (strcasecmp(hexsl, ZFS_MLSLABEL_DEFAULT) == 0) 1355 return (0); 1356 if (strcasecmp(hexsl, ADMIN_HIGH) == 0) 1357 return (0); 1358 if (strcasecmp(hexsl, ADMIN_LOW) == 0) { 1359 /* must be readonly */ 1360 uint64_t rdonly; 1361 1362 if (dsl_prop_get_integer(dsname, 1363 zfs_prop_to_name(ZFS_PROP_READONLY), &rdonly, NULL)) 1364 return (SET_ERROR(EACCES)); 1365 return (rdonly ? 0 : EACCES); 1366 } 1367 return (SET_ERROR(EACCES)); 1368} 1369 1370/* 1371 * Determine whether the mount is allowed according to MAC check. 1372 * by comparing (where appropriate) label of the dataset against 1373 * the label of the zone being mounted into. If the dataset has 1374 * no label, create one. 1375 * 1376 * Returns 0 if access allowed, error otherwise (e.g. EACCES) 1377 */ 1378static int 1379zfs_mount_label_policy(vfs_t *vfsp, char *osname) 1380{ 1381 int error, retv; 1382 zone_t *mntzone = NULL; 1383 ts_label_t *mnt_tsl; 1384 bslabel_t *mnt_sl; 1385 bslabel_t ds_sl; 1386 char ds_hexsl[MAXNAMELEN]; 1387 1388 retv = EACCES; /* assume the worst */ 1389 1390 /* 1391 * Start by getting the dataset label if it exists. 1392 */ 1393 error = dsl_prop_get(osname, zfs_prop_to_name(ZFS_PROP_MLSLABEL), 1394 1, sizeof (ds_hexsl), &ds_hexsl, NULL); 1395 if (error) 1396 return (SET_ERROR(EACCES)); 1397 1398 /* 1399 * If labeling is NOT enabled, then disallow the mount of datasets 1400 * which have a non-default label already. No other label checks 1401 * are needed. 1402 */ 1403 if (!is_system_labeled()) { 1404 if (strcasecmp(ds_hexsl, ZFS_MLSLABEL_DEFAULT) == 0) 1405 return (0); 1406 return (SET_ERROR(EACCES)); 1407 } 1408 1409 /* 1410 * Get the label of the mountpoint. If mounting into the global 1411 * zone (i.e. mountpoint is not within an active zone and the 1412 * zoned property is off), the label must be default or 1413 * admin_low/admin_high only; no other checks are needed. 1414 */ 1415 mntzone = zone_find_by_any_path(refstr_value(vfsp->vfs_mntpt), B_FALSE); 1416 if (mntzone->zone_id == GLOBAL_ZONEID) { 1417 uint64_t zoned; 1418 1419 zone_rele(mntzone); 1420 1421 if (dsl_prop_get_integer(osname, 1422 zfs_prop_to_name(ZFS_PROP_ZONED), &zoned, NULL)) 1423 return (SET_ERROR(EACCES)); 1424 if (!zoned) 1425 return (zfs_check_global_label(osname, ds_hexsl)); 1426 else 1427 /* 1428 * This is the case of a zone dataset being mounted 1429 * initially, before the zone has been fully created; 1430 * allow this mount into global zone. 1431 */ 1432 return (0); 1433 } 1434 1435 mnt_tsl = mntzone->zone_slabel; 1436 ASSERT(mnt_tsl != NULL); 1437 label_hold(mnt_tsl); 1438 mnt_sl = label2bslabel(mnt_tsl); 1439 1440 if (strcasecmp(ds_hexsl, ZFS_MLSLABEL_DEFAULT) == 0) { 1441 /* 1442 * The dataset doesn't have a real label, so fabricate one. 1443 */ 1444 char *str = NULL; 1445 1446 if (l_to_str_internal(mnt_sl, &str) == 0 && 1447 dsl_prop_set_string(osname, 1448 zfs_prop_to_name(ZFS_PROP_MLSLABEL), 1449 ZPROP_SRC_LOCAL, str) == 0) 1450 retv = 0; 1451 if (str != NULL) 1452 kmem_free(str, strlen(str) + 1); 1453 } else if (hexstr_to_label(ds_hexsl, &ds_sl) == 0) { 1454 /* 1455 * Now compare labels to complete the MAC check. If the 1456 * labels are equal then allow access. If the mountpoint 1457 * label dominates the dataset label, allow readonly access. 1458 * Otherwise, access is denied. 1459 */ 1460 if (blequal(mnt_sl, &ds_sl)) 1461 retv = 0; 1462 else if (bldominates(mnt_sl, &ds_sl)) { 1463 vfs_setmntopt(vfsp, MNTOPT_RO, NULL, 0); 1464 retv = 0; 1465 } 1466 } 1467 1468 label_rele(mnt_tsl); 1469 zone_rele(mntzone); 1470 return (retv); 1471} 1472#endif /* SECLABEL */ 1473 1474#ifdef OPENSOLARIS_MOUNTROOT 1475static int 1476zfs_mountroot(vfs_t *vfsp, enum whymountroot why) 1477{ 1478 int error = 0; 1479 static int zfsrootdone = 0; 1480 zfsvfs_t *zfsvfs = NULL; 1481 znode_t *zp = NULL; 1482 vnode_t *vp = NULL; 1483 char *zfs_bootfs; 1484 char *zfs_devid; 1485 1486 ASSERT(vfsp); 1487 1488 /* 1489 * The filesystem that we mount as root is defined in the 1490 * boot property "zfs-bootfs" with a format of 1491 * "poolname/root-dataset-objnum". 1492 */ 1493 if (why == ROOT_INIT) { 1494 if (zfsrootdone++) 1495 return (SET_ERROR(EBUSY)); 1496 /* 1497 * the process of doing a spa_load will require the 1498 * clock to be set before we could (for example) do 1499 * something better by looking at the timestamp on 1500 * an uberblock, so just set it to -1. 1501 */ 1502 clkset(-1); 1503 1504 if ((zfs_bootfs = spa_get_bootprop("zfs-bootfs")) == NULL) { 1505 cmn_err(CE_NOTE, "spa_get_bootfs: can not get " 1506 "bootfs name"); 1507 return (SET_ERROR(EINVAL)); 1508 } 1509 zfs_devid = spa_get_bootprop("diskdevid"); 1510 error = spa_import_rootpool(rootfs.bo_name, zfs_devid); 1511 if (zfs_devid) 1512 spa_free_bootprop(zfs_devid); 1513 if (error) { 1514 spa_free_bootprop(zfs_bootfs); 1515 cmn_err(CE_NOTE, "spa_import_rootpool: error %d", 1516 error); 1517 return (error); 1518 } 1519 if (error = zfs_parse_bootfs(zfs_bootfs, rootfs.bo_name)) { 1520 spa_free_bootprop(zfs_bootfs); 1521 cmn_err(CE_NOTE, "zfs_parse_bootfs: error %d", 1522 error); 1523 return (error); 1524 } 1525 1526 spa_free_bootprop(zfs_bootfs); 1527 1528 if (error = vfs_lock(vfsp)) 1529 return (error); 1530 1531 if (error = zfs_domount(vfsp, rootfs.bo_name)) { 1532 cmn_err(CE_NOTE, "zfs_domount: error %d", error); 1533 goto out; 1534 } 1535 1536 zfsvfs = (zfsvfs_t *)vfsp->vfs_data; 1537 ASSERT(zfsvfs); 1538 if (error = zfs_zget(zfsvfs, zfsvfs->z_root, &zp)) { 1539 cmn_err(CE_NOTE, "zfs_zget: error %d", error); 1540 goto out; 1541 } 1542 1543 vp = ZTOV(zp); 1544 mutex_enter(&vp->v_lock); 1545 vp->v_flag |= VROOT; 1546 mutex_exit(&vp->v_lock); 1547 rootvp = vp; 1548 1549 /* 1550 * Leave rootvp held. The root file system is never unmounted. 1551 */ 1552 1553 vfs_add((struct vnode *)0, vfsp, 1554 (vfsp->vfs_flag & VFS_RDONLY) ? MS_RDONLY : 0); 1555out: 1556 vfs_unlock(vfsp); 1557 return (error); 1558 } else if (why == ROOT_REMOUNT) { 1559 readonly_changed_cb(vfsp->vfs_data, B_FALSE); 1560 vfsp->vfs_flag |= VFS_REMOUNT; 1561 1562 /* refresh mount options */ 1563 zfs_unregister_callbacks(vfsp->vfs_data); 1564 return (zfs_register_callbacks(vfsp)); 1565 1566 } else if (why == ROOT_UNMOUNT) { 1567 zfs_unregister_callbacks((zfsvfs_t *)vfsp->vfs_data); 1568 (void) zfs_sync(vfsp, 0, 0); 1569 return (0); 1570 } 1571 1572 /* 1573 * if "why" is equal to anything else other than ROOT_INIT, 1574 * ROOT_REMOUNT, or ROOT_UNMOUNT, we do not support it. 1575 */ 1576 return (SET_ERROR(ENOTSUP)); 1577} 1578#endif /* OPENSOLARIS_MOUNTROOT */ 1579 1580static int 1581getpoolname(const char *osname, char *poolname) 1582{ 1583 char *p; 1584 1585 p = strchr(osname, '/'); 1586 if (p == NULL) { 1587 if (strlen(osname) >= MAXNAMELEN) 1588 return (ENAMETOOLONG); 1589 (void) strcpy(poolname, osname); 1590 } else { 1591 if (p - osname >= MAXNAMELEN) 1592 return (ENAMETOOLONG); 1593 (void) strncpy(poolname, osname, p - osname); 1594 poolname[p - osname] = '\0'; 1595 } 1596 return (0); 1597} 1598 1599/*ARGSUSED*/ 1600static int 1601zfs_mount(vfs_t *vfsp) 1602{ 1603 kthread_t *td = curthread; 1604 vnode_t *mvp = vfsp->mnt_vnodecovered; 1605 cred_t *cr = td->td_ucred; 1606 char *osname; 1607 int error = 0; 1608 int canwrite; 1609 1610#ifdef illumos 1611 if (mvp->v_type != VDIR) 1612 return (SET_ERROR(ENOTDIR)); 1613 1614 mutex_enter(&mvp->v_lock); 1615 if ((uap->flags & MS_REMOUNT) == 0 && 1616 (uap->flags & MS_OVERLAY) == 0 && 1617 (mvp->v_count != 1 || (mvp->v_flag & VROOT))) { 1618 mutex_exit(&mvp->v_lock); 1619 return (SET_ERROR(EBUSY)); 1620 } 1621 mutex_exit(&mvp->v_lock); 1622 1623 /* 1624 * ZFS does not support passing unparsed data in via MS_DATA. 1625 * Users should use the MS_OPTIONSTR interface; this means 1626 * that all option parsing is already done and the options struct 1627 * can be interrogated. 1628 */ 1629 if ((uap->flags & MS_DATA) && uap->datalen > 0) 1630#else 1631 if (!prison_allow(td->td_ucred, PR_ALLOW_MOUNT_ZFS)) 1632 return (SET_ERROR(EPERM)); 1633 1634 if (vfs_getopt(vfsp->mnt_optnew, "from", (void **)&osname, NULL)) 1635 return (SET_ERROR(EINVAL)); 1636#endif /* ! illumos */ 1637 1638 /* 1639 * If full-owner-access is enabled and delegated administration is 1640 * turned on, we must set nosuid. 1641 */ 1642 if (zfs_super_owner && 1643 dsl_deleg_access(osname, ZFS_DELEG_PERM_MOUNT, cr) != ECANCELED) { 1644 secpolicy_fs_mount_clearopts(cr, vfsp); 1645 } 1646 1647 /* 1648 * Check for mount privilege? 1649 * 1650 * If we don't have privilege then see if 1651 * we have local permission to allow it 1652 */ 1653 error = secpolicy_fs_mount(cr, mvp, vfsp); 1654 if (error) { 1655 if (dsl_deleg_access(osname, ZFS_DELEG_PERM_MOUNT, cr) != 0) 1656 goto out; 1657 1658 if (!(vfsp->vfs_flag & MS_REMOUNT)) { 1659 vattr_t vattr; 1660 1661 /* 1662 * Make sure user is the owner of the mount point 1663 * or has sufficient privileges. 1664 */ 1665 1666 vattr.va_mask = AT_UID; 1667 1668 vn_lock(mvp, LK_SHARED | LK_RETRY); 1669 if (VOP_GETATTR(mvp, &vattr, cr)) { 1670 VOP_UNLOCK(mvp, 0); 1671 goto out; 1672 } 1673 1674 if (secpolicy_vnode_owner(mvp, cr, vattr.va_uid) != 0 && 1675 VOP_ACCESS(mvp, VWRITE, cr, td) != 0) { 1676 VOP_UNLOCK(mvp, 0); 1677 goto out; 1678 } 1679 VOP_UNLOCK(mvp, 0); 1680 } 1681 1682 secpolicy_fs_mount_clearopts(cr, vfsp); 1683 } 1684 1685 /* 1686 * Refuse to mount a filesystem if we are in a local zone and the 1687 * dataset is not visible. 1688 */ 1689 if (!INGLOBALZONE(curthread) && 1690 (!zone_dataset_visible(osname, &canwrite) || !canwrite)) { 1691 error = SET_ERROR(EPERM); 1692 goto out; 1693 } 1694 1695#ifdef SECLABEL 1696 error = zfs_mount_label_policy(vfsp, osname); 1697 if (error) 1698 goto out; 1699#endif 1700 1701 vfsp->vfs_flag |= MNT_NFS4ACLS; 1702 1703 /* 1704 * When doing a remount, we simply refresh our temporary properties 1705 * according to those options set in the current VFS options. 1706 */ 1707 if (vfsp->vfs_flag & MS_REMOUNT) { 1708 /* refresh mount options */ 1709 zfs_unregister_callbacks(vfsp->vfs_data); 1710 error = zfs_register_callbacks(vfsp); 1711 goto out; 1712 } 1713 1714 /* Initial root mount: try hard to import the requested root pool. */ 1715 if ((vfsp->vfs_flag & MNT_ROOTFS) != 0 && 1716 (vfsp->vfs_flag & MNT_UPDATE) == 0) { 1717 char pname[MAXNAMELEN]; 1718 1719 error = getpoolname(osname, pname); 1720 if (error == 0) 1721 error = spa_import_rootpool(pname); 1722 if (error) 1723 goto out; 1724 } 1725 DROP_GIANT(); 1726 error = zfs_domount(vfsp, osname); 1727 PICKUP_GIANT(); 1728 1729#ifdef sun 1730 /* 1731 * Add an extra VFS_HOLD on our parent vfs so that it can't 1732 * disappear due to a forced unmount. 1733 */ 1734 if (error == 0 && ((zfsvfs_t *)vfsp->vfs_data)->z_issnap) 1735 VFS_HOLD(mvp->v_vfsp); 1736#endif /* sun */ 1737 1738out: 1739 return (error); 1740} 1741 1742static int 1743zfs_statfs(vfs_t *vfsp, struct statfs *statp) 1744{ 1745 zfsvfs_t *zfsvfs = vfsp->vfs_data; 1746 uint64_t refdbytes, availbytes, usedobjs, availobjs; 1747 1748 statp->f_version = STATFS_VERSION; 1749 1750 ZFS_ENTER(zfsvfs); 1751 1752 dmu_objset_space(zfsvfs->z_os, 1753 &refdbytes, &availbytes, &usedobjs, &availobjs); 1754 1755 /* 1756 * The underlying storage pool actually uses multiple block sizes. 1757 * We report the fragsize as the smallest block size we support, 1758 * and we report our blocksize as the filesystem's maximum blocksize. 1759 */ 1760 statp->f_bsize = SPA_MINBLOCKSIZE; 1761 statp->f_iosize = zfsvfs->z_vfs->mnt_stat.f_iosize; 1762 1763 /* 1764 * The following report "total" blocks of various kinds in the 1765 * file system, but reported in terms of f_frsize - the 1766 * "fragment" size. 1767 */ 1768 1769 statp->f_blocks = (refdbytes + availbytes) >> SPA_MINBLOCKSHIFT; 1770 statp->f_bfree = availbytes / statp->f_bsize; 1771 statp->f_bavail = statp->f_bfree; /* no root reservation */ 1772 1773 /* 1774 * statvfs() should really be called statufs(), because it assumes 1775 * static metadata. ZFS doesn't preallocate files, so the best 1776 * we can do is report the max that could possibly fit in f_files, 1777 * and that minus the number actually used in f_ffree. 1778 * For f_ffree, report the smaller of the number of object available 1779 * and the number of blocks (each object will take at least a block). 1780 */ 1781 statp->f_ffree = MIN(availobjs, statp->f_bfree); 1782 statp->f_files = statp->f_ffree + usedobjs; 1783 1784 /* 1785 * We're a zfs filesystem. 1786 */ 1787 (void) strlcpy(statp->f_fstypename, "zfs", sizeof(statp->f_fstypename)); 1788 1789 strlcpy(statp->f_mntfromname, vfsp->mnt_stat.f_mntfromname, 1790 sizeof(statp->f_mntfromname)); 1791 strlcpy(statp->f_mntonname, vfsp->mnt_stat.f_mntonname, 1792 sizeof(statp->f_mntonname)); 1793 1794 statp->f_namemax = ZFS_MAXNAMELEN; 1795 1796 ZFS_EXIT(zfsvfs); 1797 return (0); 1798} 1799 1800int 1801zfs_vnode_lock(vnode_t *vp, int flags) 1802{ 1803 int error; 1804 1805 ASSERT(vp != NULL); 1806 1807 error = vn_lock(vp, flags); 1808 return (error); 1809} 1810 1811static int 1812zfs_root(vfs_t *vfsp, int flags, vnode_t **vpp) 1813{ 1814 zfsvfs_t *zfsvfs = vfsp->vfs_data; 1815 znode_t *rootzp; 1816 int error; 1817 1818 ZFS_ENTER_NOERROR(zfsvfs); 1819 1820 error = zfs_zget(zfsvfs, zfsvfs->z_root, &rootzp); 1821 if (error == 0) 1822 *vpp = ZTOV(rootzp); 1823 1824 ZFS_EXIT(zfsvfs); 1825 1826 if (error == 0) { 1827 error = zfs_vnode_lock(*vpp, flags); 1828 if (error == 0) 1829 (*vpp)->v_vflag |= VV_ROOT; 1830 } 1831 if (error != 0) 1832 *vpp = NULL; 1833 1834 return (error); 1835} 1836 1837/* 1838 * Teardown the zfsvfs::z_os. 1839 * 1840 * Note, if 'unmounting' if FALSE, we return with the 'z_teardown_lock' 1841 * and 'z_teardown_inactive_lock' held. 1842 */ 1843static int 1844zfsvfs_teardown(zfsvfs_t *zfsvfs, boolean_t unmounting) 1845{ 1846 znode_t *zp; 1847 1848 rrw_enter(&zfsvfs->z_teardown_lock, RW_WRITER, FTAG); 1849 1850 if (!unmounting) { 1851 /* 1852 * We purge the parent filesystem's vfsp as the parent 1853 * filesystem and all of its snapshots have their vnode's 1854 * v_vfsp set to the parent's filesystem's vfsp. Note, 1855 * 'z_parent' is self referential for non-snapshots. 1856 */ 1857 (void) dnlc_purge_vfsp(zfsvfs->z_parent->z_vfs, 0); 1858#ifdef FREEBSD_NAMECACHE 1859 cache_purgevfs(zfsvfs->z_parent->z_vfs); 1860#endif 1861 } 1862 1863 /* 1864 * Close the zil. NB: Can't close the zil while zfs_inactive 1865 * threads are blocked as zil_close can call zfs_inactive. 1866 */ 1867 if (zfsvfs->z_log) { 1868 zil_close(zfsvfs->z_log); 1869 zfsvfs->z_log = NULL; 1870 } 1871 1872 rw_enter(&zfsvfs->z_teardown_inactive_lock, RW_WRITER); 1873 1874 /* 1875 * If we are not unmounting (ie: online recv) and someone already 1876 * unmounted this file system while we were doing the switcheroo, 1877 * or a reopen of z_os failed then just bail out now. 1878 */ 1879 if (!unmounting && (zfsvfs->z_unmounted || zfsvfs->z_os == NULL)) { 1880 rw_exit(&zfsvfs->z_teardown_inactive_lock); 1881 rrw_exit(&zfsvfs->z_teardown_lock, FTAG); 1882 return (SET_ERROR(EIO)); 1883 } 1884 1885 /* 1886 * At this point there are no vops active, and any new vops will 1887 * fail with EIO since we have z_teardown_lock for writer (only 1888 * relavent for forced unmount). 1889 * 1890 * Release all holds on dbufs. 1891 */ 1892 mutex_enter(&zfsvfs->z_znodes_lock); 1893 for (zp = list_head(&zfsvfs->z_all_znodes); zp != NULL; 1894 zp = list_next(&zfsvfs->z_all_znodes, zp)) 1895 if (zp->z_sa_hdl) { 1896 ASSERT(ZTOV(zp)->v_count >= 0); 1897 zfs_znode_dmu_fini(zp); 1898 } 1899 mutex_exit(&zfsvfs->z_znodes_lock); 1900 1901 /* 1902 * If we are unmounting, set the unmounted flag and let new vops 1903 * unblock. zfs_inactive will have the unmounted behavior, and all 1904 * other vops will fail with EIO. 1905 */ 1906 if (unmounting) { 1907 zfsvfs->z_unmounted = B_TRUE; 1908 rrw_exit(&zfsvfs->z_teardown_lock, FTAG); 1909 rw_exit(&zfsvfs->z_teardown_inactive_lock); 1910 } 1911 1912 /* 1913 * z_os will be NULL if there was an error in attempting to reopen 1914 * zfsvfs, so just return as the properties had already been 1915 * unregistered and cached data had been evicted before. 1916 */ 1917 if (zfsvfs->z_os == NULL) 1918 return (0); 1919 1920 /* 1921 * Unregister properties. 1922 */ 1923 zfs_unregister_callbacks(zfsvfs); 1924 1925 /* 1926 * Evict cached data 1927 */ 1928 if (dsl_dataset_is_dirty(dmu_objset_ds(zfsvfs->z_os)) && 1929 !(zfsvfs->z_vfs->vfs_flag & VFS_RDONLY)) 1930 txg_wait_synced(dmu_objset_pool(zfsvfs->z_os), 0); 1931 dmu_objset_evict_dbufs(zfsvfs->z_os); 1932 1933 return (0); 1934} 1935 1936/*ARGSUSED*/ 1937static int 1938zfs_umount(vfs_t *vfsp, int fflag) 1939{ 1940 kthread_t *td = curthread; 1941 zfsvfs_t *zfsvfs = vfsp->vfs_data; 1942 objset_t *os; 1943 cred_t *cr = td->td_ucred; 1944 int ret; 1945 1946 ret = secpolicy_fs_unmount(cr, vfsp); 1947 if (ret) { 1948 if (dsl_deleg_access((char *)refstr_value(vfsp->vfs_resource), 1949 ZFS_DELEG_PERM_MOUNT, cr)) 1950 return (ret); 1951 } 1952 1953 /* 1954 * We purge the parent filesystem's vfsp as the parent filesystem 1955 * and all of its snapshots have their vnode's v_vfsp set to the 1956 * parent's filesystem's vfsp. Note, 'z_parent' is self 1957 * referential for non-snapshots. 1958 */ 1959 (void) dnlc_purge_vfsp(zfsvfs->z_parent->z_vfs, 0); 1960 1961 /* 1962 * Unmount any snapshots mounted under .zfs before unmounting the 1963 * dataset itself. 1964 */ 1965 if (zfsvfs->z_ctldir != NULL) { 1966 if ((ret = zfsctl_umount_snapshots(vfsp, fflag, cr)) != 0) 1967 return (ret); 1968 ret = vflush(vfsp, 0, 0, td); 1969 ASSERT(ret == EBUSY); 1970 if (!(fflag & MS_FORCE)) { 1971 if (zfsvfs->z_ctldir->v_count > 1) 1972 return (EBUSY); 1973 ASSERT(zfsvfs->z_ctldir->v_count == 1); 1974 } 1975 zfsctl_destroy(zfsvfs); 1976 ASSERT(zfsvfs->z_ctldir == NULL); 1977 } 1978 1979 if (fflag & MS_FORCE) { 1980 /* 1981 * Mark file system as unmounted before calling 1982 * vflush(FORCECLOSE). This way we ensure no future vnops 1983 * will be called and risk operating on DOOMED vnodes. 1984 */ 1985 rrw_enter(&zfsvfs->z_teardown_lock, RW_WRITER, FTAG); 1986 zfsvfs->z_unmounted = B_TRUE; 1987 rrw_exit(&zfsvfs->z_teardown_lock, FTAG); 1988 } 1989 1990 /* 1991 * Flush all the files. 1992 */ 1993 ret = vflush(vfsp, 1, (fflag & MS_FORCE) ? FORCECLOSE : 0, td); 1994 if (ret != 0) { 1995 if (!zfsvfs->z_issnap) { 1996 zfsctl_create(zfsvfs); 1997 ASSERT(zfsvfs->z_ctldir != NULL); 1998 } 1999 return (ret); 2000 } 2001 2002 if (!(fflag & MS_FORCE)) { 2003 /* 2004 * Check the number of active vnodes in the file system. 2005 * Our count is maintained in the vfs structure, but the 2006 * number is off by 1 to indicate a hold on the vfs 2007 * structure itself. 2008 * 2009 * The '.zfs' directory maintains a reference of its 2010 * own, and any active references underneath are 2011 * reflected in the vnode count. 2012 */ 2013 if (zfsvfs->z_ctldir == NULL) { 2014 if (vfsp->vfs_count > 1) 2015 return (SET_ERROR(EBUSY)); 2016 } else { 2017 if (vfsp->vfs_count > 2 || 2018 zfsvfs->z_ctldir->v_count > 1) 2019 return (SET_ERROR(EBUSY)); 2020 } 2021 } 2022 2023 VERIFY(zfsvfs_teardown(zfsvfs, B_TRUE) == 0); 2024 os = zfsvfs->z_os; 2025 2026 /* 2027 * z_os will be NULL if there was an error in 2028 * attempting to reopen zfsvfs. 2029 */ 2030 if (os != NULL) { 2031 /* 2032 * Unset the objset user_ptr. 2033 */ 2034 mutex_enter(&os->os_user_ptr_lock); 2035 dmu_objset_set_user(os, NULL); 2036 mutex_exit(&os->os_user_ptr_lock); 2037 2038 /* 2039 * Finally release the objset 2040 */ 2041 dmu_objset_disown(os, zfsvfs); 2042 } 2043 2044 /* 2045 * We can now safely destroy the '.zfs' directory node. 2046 */ 2047 if (zfsvfs->z_ctldir != NULL) 2048 zfsctl_destroy(zfsvfs); 2049 if (zfsvfs->z_issnap) { 2050 vnode_t *svp = vfsp->mnt_vnodecovered; 2051 2052 if (svp->v_count >= 2) 2053 VN_RELE(svp); 2054 } 2055 zfs_freevfs(vfsp); 2056 2057 return (0); 2058} 2059 2060static int 2061zfs_vget(vfs_t *vfsp, ino_t ino, int flags, vnode_t **vpp) 2062{ 2063 zfsvfs_t *zfsvfs = vfsp->vfs_data; 2064 znode_t *zp; 2065 int err; 2066 2067 /* 2068 * zfs_zget() can't operate on virtual entries like .zfs/ or 2069 * .zfs/snapshot/ directories, that's why we return EOPNOTSUPP. 2070 * This will make NFS to switch to LOOKUP instead of using VGET. 2071 */ 2072 if (ino == ZFSCTL_INO_ROOT || ino == ZFSCTL_INO_SNAPDIR || 2073 (zfsvfs->z_shares_dir != 0 && ino == zfsvfs->z_shares_dir)) 2074 return (EOPNOTSUPP); 2075 2076 ZFS_ENTER(zfsvfs); 2077 err = zfs_zget(zfsvfs, ino, &zp); 2078 if (err == 0 && zp->z_unlinked) { 2079 VN_RELE(ZTOV(zp)); 2080 err = EINVAL; 2081 } 2082 if (err == 0) 2083 *vpp = ZTOV(zp); 2084 ZFS_EXIT(zfsvfs); 2085 if (err == 0) 2086 err = zfs_vnode_lock(*vpp, flags); 2087 if (err != 0) 2088 *vpp = NULL; 2089 else 2090 (*vpp)->v_hash = ino; 2091 return (err); 2092} 2093 2094static int 2095zfs_checkexp(vfs_t *vfsp, struct sockaddr *nam, int *extflagsp, 2096 struct ucred **credanonp, int *numsecflavors, int **secflavors) 2097{ 2098 zfsvfs_t *zfsvfs = vfsp->vfs_data; 2099 2100 /* 2101 * If this is regular file system vfsp is the same as 2102 * zfsvfs->z_parent->z_vfs, but if it is snapshot, 2103 * zfsvfs->z_parent->z_vfs represents parent file system 2104 * which we have to use here, because only this file system 2105 * has mnt_export configured. 2106 */ 2107 return (vfs_stdcheckexp(zfsvfs->z_parent->z_vfs, nam, extflagsp, 2108 credanonp, numsecflavors, secflavors)); 2109} 2110 2111CTASSERT(SHORT_FID_LEN <= sizeof(struct fid)); 2112CTASSERT(LONG_FID_LEN <= sizeof(struct fid)); 2113 2114static int 2115zfs_fhtovp(vfs_t *vfsp, fid_t *fidp, int flags, vnode_t **vpp) 2116{ 2117 zfsvfs_t *zfsvfs = vfsp->vfs_data; 2118 znode_t *zp; 2119 uint64_t object = 0; 2120 uint64_t fid_gen = 0; 2121 uint64_t gen_mask; 2122 uint64_t zp_gen; 2123 int i, err; 2124 2125 *vpp = NULL; 2126 2127 ZFS_ENTER(zfsvfs); 2128 2129 /* 2130 * On FreeBSD we can get snapshot's mount point or its parent file 2131 * system mount point depending if snapshot is already mounted or not. 2132 */ 2133 if (zfsvfs->z_parent == zfsvfs && fidp->fid_len == LONG_FID_LEN) { 2134 zfid_long_t *zlfid = (zfid_long_t *)fidp; 2135 uint64_t objsetid = 0; 2136 uint64_t setgen = 0; 2137 2138 for (i = 0; i < sizeof (zlfid->zf_setid); i++) 2139 objsetid |= ((uint64_t)zlfid->zf_setid[i]) << (8 * i); 2140 2141 for (i = 0; i < sizeof (zlfid->zf_setgen); i++) 2142 setgen |= ((uint64_t)zlfid->zf_setgen[i]) << (8 * i); 2143 2144 ZFS_EXIT(zfsvfs); 2145 2146 err = zfsctl_lookup_objset(vfsp, objsetid, &zfsvfs); 2147 if (err) 2148 return (SET_ERROR(EINVAL)); 2149 ZFS_ENTER(zfsvfs); 2150 } 2151 2152 if (fidp->fid_len == SHORT_FID_LEN || fidp->fid_len == LONG_FID_LEN) { 2153 zfid_short_t *zfid = (zfid_short_t *)fidp; 2154 2155 for (i = 0; i < sizeof (zfid->zf_object); i++) 2156 object |= ((uint64_t)zfid->zf_object[i]) << (8 * i); 2157 2158 for (i = 0; i < sizeof (zfid->zf_gen); i++) 2159 fid_gen |= ((uint64_t)zfid->zf_gen[i]) << (8 * i); 2160 } else { 2161 ZFS_EXIT(zfsvfs); 2162 return (SET_ERROR(EINVAL)); 2163 } 2164 2165 /* 2166 * A zero fid_gen means we are in .zfs or the .zfs/snapshot 2167 * directory tree. If the object == zfsvfs->z_shares_dir, then 2168 * we are in the .zfs/shares directory tree. 2169 */ 2170 if ((fid_gen == 0 && 2171 (object == ZFSCTL_INO_ROOT || object == ZFSCTL_INO_SNAPDIR)) || 2172 (zfsvfs->z_shares_dir != 0 && object == zfsvfs->z_shares_dir)) { 2173 *vpp = zfsvfs->z_ctldir; 2174 ASSERT(*vpp != NULL); 2175 if (object == ZFSCTL_INO_SNAPDIR) { 2176 VERIFY(zfsctl_root_lookup(*vpp, "snapshot", vpp, NULL, 2177 0, NULL, NULL, NULL, NULL, NULL) == 0); 2178 } else if (object == zfsvfs->z_shares_dir) { 2179 VERIFY(zfsctl_root_lookup(*vpp, "shares", vpp, NULL, 2180 0, NULL, NULL, NULL, NULL, NULL) == 0); 2181 } else { 2182 VN_HOLD(*vpp); 2183 } 2184 ZFS_EXIT(zfsvfs); 2185 err = zfs_vnode_lock(*vpp, flags); 2186 if (err != 0) 2187 *vpp = NULL; 2188 return (err); 2189 } 2190 2191 gen_mask = -1ULL >> (64 - 8 * i); 2192 2193 dprintf("getting %llu [%u mask %llx]\n", object, fid_gen, gen_mask); 2194 if (err = zfs_zget(zfsvfs, object, &zp)) { 2195 ZFS_EXIT(zfsvfs); 2196 return (err); 2197 } 2198 (void) sa_lookup(zp->z_sa_hdl, SA_ZPL_GEN(zfsvfs), &zp_gen, 2199 sizeof (uint64_t)); 2200 zp_gen = zp_gen & gen_mask; 2201 if (zp_gen == 0) 2202 zp_gen = 1; 2203 if (zp->z_unlinked || zp_gen != fid_gen) { 2204 dprintf("znode gen (%u) != fid gen (%u)\n", zp_gen, fid_gen); 2205 VN_RELE(ZTOV(zp)); 2206 ZFS_EXIT(zfsvfs); 2207 return (SET_ERROR(EINVAL)); 2208 } 2209 2210 *vpp = ZTOV(zp); 2211 ZFS_EXIT(zfsvfs); 2212 err = zfs_vnode_lock(*vpp, flags | LK_RETRY); 2213 if (err == 0) 2214 vnode_create_vobject(*vpp, zp->z_size, curthread); 2215 else 2216 *vpp = NULL; 2217 return (err); 2218} 2219 2220/* 2221 * Block out VOPs and close zfsvfs_t::z_os 2222 * 2223 * Note, if successful, then we return with the 'z_teardown_lock' and 2224 * 'z_teardown_inactive_lock' write held. 2225 */ 2226int 2227zfs_suspend_fs(zfsvfs_t *zfsvfs) 2228{ 2229 int error; 2230 2231 if ((error = zfsvfs_teardown(zfsvfs, B_FALSE)) != 0) 2232 return (error); 2233 dmu_objset_disown(zfsvfs->z_os, zfsvfs); 2234 2235 return (0); 2236} 2237 2238/* 2239 * Reopen zfsvfs_t::z_os and release VOPs. 2240 */ 2241int 2242zfs_resume_fs(zfsvfs_t *zfsvfs, const char *osname) 2243{ 2244 int err; 2245 2246 ASSERT(RRW_WRITE_HELD(&zfsvfs->z_teardown_lock)); 2247 ASSERT(RW_WRITE_HELD(&zfsvfs->z_teardown_inactive_lock)); 2248 2249 err = dmu_objset_own(osname, DMU_OST_ZFS, B_FALSE, zfsvfs, 2250 &zfsvfs->z_os); 2251 if (err) { 2252 zfsvfs->z_os = NULL; 2253 } else { 2254 znode_t *zp; 2255 uint64_t sa_obj = 0; 2256 2257 /* 2258 * Make sure version hasn't changed 2259 */ 2260 2261 err = zfs_get_zplprop(zfsvfs->z_os, ZFS_PROP_VERSION, 2262 &zfsvfs->z_version); 2263 2264 if (err) 2265 goto bail; 2266 2267 err = zap_lookup(zfsvfs->z_os, MASTER_NODE_OBJ, 2268 ZFS_SA_ATTRS, 8, 1, &sa_obj); 2269 2270 if (err && zfsvfs->z_version >= ZPL_VERSION_SA) 2271 goto bail; 2272 2273 if ((err = sa_setup(zfsvfs->z_os, sa_obj, 2274 zfs_attr_table, ZPL_END, &zfsvfs->z_attr_table)) != 0) 2275 goto bail; 2276 2277 if (zfsvfs->z_version >= ZPL_VERSION_SA) 2278 sa_register_update_callback(zfsvfs->z_os, 2279 zfs_sa_upgrade); 2280 2281 VERIFY(zfsvfs_setup(zfsvfs, B_FALSE) == 0); 2282 2283 zfs_set_fuid_feature(zfsvfs); 2284 2285 /* 2286 * Attempt to re-establish all the active znodes with 2287 * their dbufs. If a zfs_rezget() fails, then we'll let 2288 * any potential callers discover that via ZFS_ENTER_VERIFY_VP 2289 * when they try to use their znode. 2290 */ 2291 mutex_enter(&zfsvfs->z_znodes_lock); 2292 for (zp = list_head(&zfsvfs->z_all_znodes); zp; 2293 zp = list_next(&zfsvfs->z_all_znodes, zp)) { 2294 (void) zfs_rezget(zp); 2295 } 2296 mutex_exit(&zfsvfs->z_znodes_lock); 2297 } 2298 2299bail: 2300 /* release the VOPs */ 2301 rw_exit(&zfsvfs->z_teardown_inactive_lock); 2302 rrw_exit(&zfsvfs->z_teardown_lock, FTAG); 2303 2304 if (err) { 2305 /* 2306 * Since we couldn't reopen zfsvfs::z_os, or 2307 * setup the sa framework force unmount this file system. 2308 */ 2309 if (vn_vfswlock(zfsvfs->z_vfs->vfs_vnodecovered) == 0) 2310 (void) dounmount(zfsvfs->z_vfs, MS_FORCE, curthread); 2311 } 2312 return (err); 2313} 2314 2315static void 2316zfs_freevfs(vfs_t *vfsp) 2317{ 2318 zfsvfs_t *zfsvfs = vfsp->vfs_data; 2319 2320#ifdef sun 2321 /* 2322 * If this is a snapshot, we have an extra VFS_HOLD on our parent 2323 * from zfs_mount(). Release it here. If we came through 2324 * zfs_mountroot() instead, we didn't grab an extra hold, so 2325 * skip the VFS_RELE for rootvfs. 2326 */ 2327 if (zfsvfs->z_issnap && (vfsp != rootvfs)) 2328 VFS_RELE(zfsvfs->z_parent->z_vfs); 2329#endif /* sun */ 2330 2331 zfsvfs_free(zfsvfs); 2332 2333 atomic_add_32(&zfs_active_fs_count, -1); 2334} 2335 2336#ifdef __i386__ 2337static int desiredvnodes_backup; 2338#endif 2339 2340static void 2341zfs_vnodes_adjust(void) 2342{ 2343#ifdef __i386__ 2344 int newdesiredvnodes; 2345 2346 desiredvnodes_backup = desiredvnodes; 2347 2348 /* 2349 * We calculate newdesiredvnodes the same way it is done in 2350 * vntblinit(). If it is equal to desiredvnodes, it means that 2351 * it wasn't tuned by the administrator and we can tune it down. 2352 */ 2353 newdesiredvnodes = min(maxproc + cnt.v_page_count / 4, 2 * 2354 vm_kmem_size / (5 * (sizeof(struct vm_object) + 2355 sizeof(struct vnode)))); 2356 if (newdesiredvnodes == desiredvnodes) 2357 desiredvnodes = (3 * newdesiredvnodes) / 4; 2358#endif 2359} 2360 2361static void 2362zfs_vnodes_adjust_back(void) 2363{ 2364 2365#ifdef __i386__ 2366 desiredvnodes = desiredvnodes_backup; 2367#endif 2368} 2369 2370void 2371zfs_init(void) 2372{ 2373 2374 printf("ZFS filesystem version: " ZPL_VERSION_STRING "\n"); 2375 2376 /* 2377 * Initialize .zfs directory structures 2378 */ 2379 zfsctl_init(); 2380 2381 /* 2382 * Initialize znode cache, vnode ops, etc... 2383 */ 2384 zfs_znode_init(); 2385 2386 /* 2387 * Reduce number of vnodes. Originally number of vnodes is calculated 2388 * with UFS inode in mind. We reduce it here, because it's too big for 2389 * ZFS/i386. 2390 */ 2391 zfs_vnodes_adjust(); 2392 2393 dmu_objset_register_type(DMU_OST_ZFS, zfs_space_delta_cb); 2394} 2395 2396void 2397zfs_fini(void) 2398{ 2399 zfsctl_fini(); 2400 zfs_znode_fini(); 2401 zfs_vnodes_adjust_back(); 2402} 2403 2404int 2405zfs_busy(void) 2406{ 2407 return (zfs_active_fs_count != 0); 2408} 2409 2410int 2411zfs_set_version(zfsvfs_t *zfsvfs, uint64_t newvers) 2412{ 2413 int error; 2414 objset_t *os = zfsvfs->z_os; 2415 dmu_tx_t *tx; 2416 2417 if (newvers < ZPL_VERSION_INITIAL || newvers > ZPL_VERSION) 2418 return (SET_ERROR(EINVAL)); 2419 2420 if (newvers < zfsvfs->z_version) 2421 return (SET_ERROR(EINVAL)); 2422 2423 if (zfs_spa_version_map(newvers) > 2424 spa_version(dmu_objset_spa(zfsvfs->z_os))) 2425 return (SET_ERROR(ENOTSUP)); 2426 2427 tx = dmu_tx_create(os); 2428 dmu_tx_hold_zap(tx, MASTER_NODE_OBJ, B_FALSE, ZPL_VERSION_STR); 2429 if (newvers >= ZPL_VERSION_SA && !zfsvfs->z_use_sa) { 2430 dmu_tx_hold_zap(tx, MASTER_NODE_OBJ, B_TRUE, 2431 ZFS_SA_ATTRS); 2432 dmu_tx_hold_zap(tx, DMU_NEW_OBJECT, FALSE, NULL); 2433 } 2434 error = dmu_tx_assign(tx, TXG_WAIT); 2435 if (error) { 2436 dmu_tx_abort(tx); 2437 return (error); 2438 } 2439 2440 error = zap_update(os, MASTER_NODE_OBJ, ZPL_VERSION_STR, 2441 8, 1, &newvers, tx); 2442 2443 if (error) { 2444 dmu_tx_commit(tx); 2445 return (error); 2446 } 2447 2448 if (newvers >= ZPL_VERSION_SA && !zfsvfs->z_use_sa) { 2449 uint64_t sa_obj; 2450 2451 ASSERT3U(spa_version(dmu_objset_spa(zfsvfs->z_os)), >=, 2452 SPA_VERSION_SA); 2453 sa_obj = zap_create(os, DMU_OT_SA_MASTER_NODE, 2454 DMU_OT_NONE, 0, tx); 2455 2456 error = zap_add(os, MASTER_NODE_OBJ, 2457 ZFS_SA_ATTRS, 8, 1, &sa_obj, tx); 2458 ASSERT0(error); 2459 2460 VERIFY(0 == sa_set_sa_object(os, sa_obj)); 2461 sa_register_update_callback(os, zfs_sa_upgrade); 2462 } 2463 2464 spa_history_log_internal_ds(dmu_objset_ds(os), "upgrade", tx, 2465 "from %llu to %llu", zfsvfs->z_version, newvers); 2466 2467 dmu_tx_commit(tx); 2468 2469 zfsvfs->z_version = newvers; 2470 2471 zfs_set_fuid_feature(zfsvfs); 2472 2473 return (0); 2474} 2475 2476/* 2477 * Read a property stored within the master node. 2478 */ 2479int 2480zfs_get_zplprop(objset_t *os, zfs_prop_t prop, uint64_t *value) 2481{ 2482 const char *pname; 2483 int error = ENOENT; 2484 2485 /* 2486 * Look up the file system's value for the property. For the 2487 * version property, we look up a slightly different string. 2488 */ 2489 if (prop == ZFS_PROP_VERSION) 2490 pname = ZPL_VERSION_STR; 2491 else 2492 pname = zfs_prop_to_name(prop); 2493 2494 if (os != NULL) 2495 error = zap_lookup(os, MASTER_NODE_OBJ, pname, 8, 1, value); 2496 2497 if (error == ENOENT) { 2498 /* No value set, use the default value */ 2499 switch (prop) { 2500 case ZFS_PROP_VERSION: 2501 *value = ZPL_VERSION; 2502 break; 2503 case ZFS_PROP_NORMALIZE: 2504 case ZFS_PROP_UTF8ONLY: 2505 *value = 0; 2506 break; 2507 case ZFS_PROP_CASE: 2508 *value = ZFS_CASE_SENSITIVE; 2509 break; 2510 default: 2511 return (error); 2512 } 2513 error = 0; 2514 } 2515 return (error); 2516} 2517 2518#ifdef _KERNEL 2519void 2520zfsvfs_update_fromname(const char *oldname, const char *newname) 2521{ 2522 char tmpbuf[MAXPATHLEN]; 2523 struct mount *mp; 2524 char *fromname; 2525 size_t oldlen; 2526 2527 oldlen = strlen(oldname); 2528 2529 mtx_lock(&mountlist_mtx); 2530 TAILQ_FOREACH(mp, &mountlist, mnt_list) { 2531 fromname = mp->mnt_stat.f_mntfromname; 2532 if (strcmp(fromname, oldname) == 0) { 2533 (void)strlcpy(fromname, newname, 2534 sizeof(mp->mnt_stat.f_mntfromname)); 2535 continue; 2536 } 2537 if (strncmp(fromname, oldname, oldlen) == 0 && 2538 (fromname[oldlen] == '/' || fromname[oldlen] == '@')) { 2539 (void)snprintf(tmpbuf, sizeof(tmpbuf), "%s%s", 2540 newname, fromname + oldlen); 2541 (void)strlcpy(fromname, tmpbuf, 2542 sizeof(mp->mnt_stat.f_mntfromname)); 2543 continue; 2544 } 2545 } 2546 mtx_unlock(&mountlist_mtx); 2547} 2548#endif 2549