zfs_vfsops.c revision 288571
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 */ 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_kernel__ 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_kernel__ */ 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 ASSERT3U(newval, <=, spa_maxblocksize(dmu_objset_spa(zfsvfs->z_os))); 275 ASSERT3U(newval, >=, SPA_MINBLOCKSIZE); 276 ASSERT(ISP2(newval)); 277 278 zfsvfs->z_max_blksz = newval; 279 zfsvfs->z_vfs->mnt_stat.f_iosize = newval; 280} 281 282static void 283readonly_changed_cb(void *arg, uint64_t newval) 284{ 285 zfsvfs_t *zfsvfs = arg; 286 287 if (newval) { 288 /* XXX locking on vfs_flag? */ 289 zfsvfs->z_vfs->vfs_flag |= VFS_RDONLY; 290 vfs_clearmntopt(zfsvfs->z_vfs, MNTOPT_RW); 291 vfs_setmntopt(zfsvfs->z_vfs, MNTOPT_RO, NULL, 0); 292 } else { 293 /* XXX locking on vfs_flag? */ 294 zfsvfs->z_vfs->vfs_flag &= ~VFS_RDONLY; 295 vfs_clearmntopt(zfsvfs->z_vfs, MNTOPT_RO); 296 vfs_setmntopt(zfsvfs->z_vfs, MNTOPT_RW, NULL, 0); 297 } 298} 299 300static void 301setuid_changed_cb(void *arg, uint64_t newval) 302{ 303 zfsvfs_t *zfsvfs = arg; 304 305 if (newval == FALSE) { 306 zfsvfs->z_vfs->vfs_flag |= VFS_NOSETUID; 307 vfs_clearmntopt(zfsvfs->z_vfs, MNTOPT_SETUID); 308 vfs_setmntopt(zfsvfs->z_vfs, MNTOPT_NOSETUID, NULL, 0); 309 } else { 310 zfsvfs->z_vfs->vfs_flag &= ~VFS_NOSETUID; 311 vfs_clearmntopt(zfsvfs->z_vfs, MNTOPT_NOSETUID); 312 vfs_setmntopt(zfsvfs->z_vfs, MNTOPT_SETUID, NULL, 0); 313 } 314} 315 316static void 317exec_changed_cb(void *arg, uint64_t newval) 318{ 319 zfsvfs_t *zfsvfs = arg; 320 321 if (newval == FALSE) { 322 zfsvfs->z_vfs->vfs_flag |= VFS_NOEXEC; 323 vfs_clearmntopt(zfsvfs->z_vfs, MNTOPT_EXEC); 324 vfs_setmntopt(zfsvfs->z_vfs, MNTOPT_NOEXEC, NULL, 0); 325 } else { 326 zfsvfs->z_vfs->vfs_flag &= ~VFS_NOEXEC; 327 vfs_clearmntopt(zfsvfs->z_vfs, MNTOPT_NOEXEC); 328 vfs_setmntopt(zfsvfs->z_vfs, MNTOPT_EXEC, NULL, 0); 329 } 330} 331 332/* 333 * The nbmand mount option can be changed at mount time. 334 * We can't allow it to be toggled on live file systems or incorrect 335 * behavior may be seen from cifs clients 336 * 337 * This property isn't registered via dsl_prop_register(), but this callback 338 * will be called when a file system is first mounted 339 */ 340static void 341nbmand_changed_cb(void *arg, uint64_t newval) 342{ 343 zfsvfs_t *zfsvfs = arg; 344 if (newval == FALSE) { 345 vfs_clearmntopt(zfsvfs->z_vfs, MNTOPT_NBMAND); 346 vfs_setmntopt(zfsvfs->z_vfs, MNTOPT_NONBMAND, NULL, 0); 347 } else { 348 vfs_clearmntopt(zfsvfs->z_vfs, MNTOPT_NONBMAND); 349 vfs_setmntopt(zfsvfs->z_vfs, MNTOPT_NBMAND, NULL, 0); 350 } 351} 352 353static void 354snapdir_changed_cb(void *arg, uint64_t newval) 355{ 356 zfsvfs_t *zfsvfs = arg; 357 358 zfsvfs->z_show_ctldir = newval; 359} 360 361static void 362vscan_changed_cb(void *arg, uint64_t newval) 363{ 364 zfsvfs_t *zfsvfs = arg; 365 366 zfsvfs->z_vscan = newval; 367} 368 369static void 370acl_mode_changed_cb(void *arg, uint64_t newval) 371{ 372 zfsvfs_t *zfsvfs = arg; 373 374 zfsvfs->z_acl_mode = newval; 375} 376 377static void 378acl_inherit_changed_cb(void *arg, uint64_t newval) 379{ 380 zfsvfs_t *zfsvfs = arg; 381 382 zfsvfs->z_acl_inherit = newval; 383} 384 385static int 386zfs_register_callbacks(vfs_t *vfsp) 387{ 388 struct dsl_dataset *ds = NULL; 389 objset_t *os = NULL; 390 zfsvfs_t *zfsvfs = NULL; 391 uint64_t nbmand; 392 boolean_t readonly = B_FALSE; 393 boolean_t do_readonly = B_FALSE; 394 boolean_t setuid = B_FALSE; 395 boolean_t do_setuid = B_FALSE; 396 boolean_t exec = B_FALSE; 397 boolean_t do_exec = B_FALSE; 398#ifdef illumos 399 boolean_t devices = B_FALSE; 400 boolean_t do_devices = B_FALSE; 401#endif 402 boolean_t xattr = B_FALSE; 403 boolean_t do_xattr = B_FALSE; 404 boolean_t atime = B_FALSE; 405 boolean_t do_atime = B_FALSE; 406 int error = 0; 407 408 ASSERT(vfsp); 409 zfsvfs = vfsp->vfs_data; 410 ASSERT(zfsvfs); 411 os = zfsvfs->z_os; 412 413 /* 414 * This function can be called for a snapshot when we update snapshot's 415 * mount point, which isn't really supported. 416 */ 417 if (dmu_objset_is_snapshot(os)) 418 return (EOPNOTSUPP); 419 420 /* 421 * The act of registering our callbacks will destroy any mount 422 * options we may have. In order to enable temporary overrides 423 * of mount options, we stash away the current values and 424 * restore them after we register the callbacks. 425 */ 426 if (vfs_optionisset(vfsp, MNTOPT_RO, NULL) || 427 !spa_writeable(dmu_objset_spa(os))) { 428 readonly = B_TRUE; 429 do_readonly = B_TRUE; 430 } else if (vfs_optionisset(vfsp, MNTOPT_RW, NULL)) { 431 readonly = B_FALSE; 432 do_readonly = B_TRUE; 433 } 434 if (vfs_optionisset(vfsp, MNTOPT_NOSUID, NULL)) { 435 setuid = B_FALSE; 436 do_setuid = B_TRUE; 437 } else { 438 if (vfs_optionisset(vfsp, MNTOPT_NOSETUID, NULL)) { 439 setuid = B_FALSE; 440 do_setuid = B_TRUE; 441 } else if (vfs_optionisset(vfsp, MNTOPT_SETUID, NULL)) { 442 setuid = B_TRUE; 443 do_setuid = B_TRUE; 444 } 445 } 446 if (vfs_optionisset(vfsp, MNTOPT_NOEXEC, NULL)) { 447 exec = B_FALSE; 448 do_exec = B_TRUE; 449 } else if (vfs_optionisset(vfsp, MNTOPT_EXEC, NULL)) { 450 exec = B_TRUE; 451 do_exec = B_TRUE; 452 } 453 if (vfs_optionisset(vfsp, MNTOPT_NOXATTR, NULL)) { 454 xattr = B_FALSE; 455 do_xattr = B_TRUE; 456 } else if (vfs_optionisset(vfsp, MNTOPT_XATTR, NULL)) { 457 xattr = B_TRUE; 458 do_xattr = B_TRUE; 459 } 460 if (vfs_optionisset(vfsp, MNTOPT_NOATIME, NULL)) { 461 atime = B_FALSE; 462 do_atime = B_TRUE; 463 } else if (vfs_optionisset(vfsp, MNTOPT_ATIME, NULL)) { 464 atime = B_TRUE; 465 do_atime = B_TRUE; 466 } 467 468 /* 469 * We need to enter pool configuration here, so that we can use 470 * dsl_prop_get_int_ds() to handle the special nbmand property below. 471 * dsl_prop_get_integer() can not be used, because it has to acquire 472 * spa_namespace_lock and we can not do that because we already hold 473 * z_teardown_lock. The problem is that spa_config_sync() is called 474 * with spa_namespace_lock held and the function calls ZFS vnode 475 * operations to write the cache file and thus z_teardown_lock is 476 * acquired after spa_namespace_lock. 477 */ 478 ds = dmu_objset_ds(os); 479 dsl_pool_config_enter(dmu_objset_pool(os), FTAG); 480 481 /* 482 * nbmand is a special property. It can only be changed at 483 * mount time. 484 * 485 * This is weird, but it is documented to only be changeable 486 * at mount time. 487 */ 488 if (vfs_optionisset(vfsp, MNTOPT_NONBMAND, NULL)) { 489 nbmand = B_FALSE; 490 } else if (vfs_optionisset(vfsp, MNTOPT_NBMAND, NULL)) { 491 nbmand = B_TRUE; 492 } else if (error = dsl_prop_get_int_ds(ds, "nbmand", &nbmand) != 0) { 493 dsl_pool_config_exit(dmu_objset_pool(os), FTAG); 494 return (error); 495 } 496 497 /* 498 * Register property callbacks. 499 * 500 * It would probably be fine to just check for i/o error from 501 * the first prop_register(), but I guess I like to go 502 * overboard... 503 */ 504 error = dsl_prop_register(ds, 505 zfs_prop_to_name(ZFS_PROP_ATIME), atime_changed_cb, zfsvfs); 506 error = error ? error : dsl_prop_register(ds, 507 zfs_prop_to_name(ZFS_PROP_XATTR), xattr_changed_cb, zfsvfs); 508 error = error ? error : dsl_prop_register(ds, 509 zfs_prop_to_name(ZFS_PROP_RECORDSIZE), blksz_changed_cb, zfsvfs); 510 error = error ? error : dsl_prop_register(ds, 511 zfs_prop_to_name(ZFS_PROP_READONLY), readonly_changed_cb, zfsvfs); 512#ifdef illumos 513 error = error ? error : dsl_prop_register(ds, 514 zfs_prop_to_name(ZFS_PROP_DEVICES), devices_changed_cb, zfsvfs); 515#endif 516 error = error ? error : dsl_prop_register(ds, 517 zfs_prop_to_name(ZFS_PROP_SETUID), setuid_changed_cb, zfsvfs); 518 error = error ? error : dsl_prop_register(ds, 519 zfs_prop_to_name(ZFS_PROP_EXEC), exec_changed_cb, zfsvfs); 520 error = error ? error : dsl_prop_register(ds, 521 zfs_prop_to_name(ZFS_PROP_SNAPDIR), snapdir_changed_cb, zfsvfs); 522 error = error ? error : dsl_prop_register(ds, 523 zfs_prop_to_name(ZFS_PROP_ACLMODE), acl_mode_changed_cb, zfsvfs); 524 error = error ? error : dsl_prop_register(ds, 525 zfs_prop_to_name(ZFS_PROP_ACLINHERIT), acl_inherit_changed_cb, 526 zfsvfs); 527 error = error ? error : dsl_prop_register(ds, 528 zfs_prop_to_name(ZFS_PROP_VSCAN), vscan_changed_cb, zfsvfs); 529 dsl_pool_config_exit(dmu_objset_pool(os), FTAG); 530 if (error) 531 goto unregister; 532 533 /* 534 * Invoke our callbacks to restore temporary mount options. 535 */ 536 if (do_readonly) 537 readonly_changed_cb(zfsvfs, readonly); 538 if (do_setuid) 539 setuid_changed_cb(zfsvfs, setuid); 540 if (do_exec) 541 exec_changed_cb(zfsvfs, exec); 542 if (do_xattr) 543 xattr_changed_cb(zfsvfs, xattr); 544 if (do_atime) 545 atime_changed_cb(zfsvfs, atime); 546 547 nbmand_changed_cb(zfsvfs, nbmand); 548 549 return (0); 550 551unregister: 552 /* 553 * We may attempt to unregister some callbacks that are not 554 * registered, but this is OK; it will simply return ENOMSG, 555 * which we will ignore. 556 */ 557 (void) dsl_prop_unregister(ds, zfs_prop_to_name(ZFS_PROP_ATIME), 558 atime_changed_cb, zfsvfs); 559 (void) dsl_prop_unregister(ds, zfs_prop_to_name(ZFS_PROP_XATTR), 560 xattr_changed_cb, zfsvfs); 561 (void) dsl_prop_unregister(ds, zfs_prop_to_name(ZFS_PROP_RECORDSIZE), 562 blksz_changed_cb, zfsvfs); 563 (void) dsl_prop_unregister(ds, zfs_prop_to_name(ZFS_PROP_READONLY), 564 readonly_changed_cb, zfsvfs); 565#ifdef illumos 566 (void) dsl_prop_unregister(ds, zfs_prop_to_name(ZFS_PROP_DEVICES), 567 devices_changed_cb, zfsvfs); 568#endif 569 (void) dsl_prop_unregister(ds, zfs_prop_to_name(ZFS_PROP_SETUID), 570 setuid_changed_cb, zfsvfs); 571 (void) dsl_prop_unregister(ds, zfs_prop_to_name(ZFS_PROP_EXEC), 572 exec_changed_cb, zfsvfs); 573 (void) dsl_prop_unregister(ds, zfs_prop_to_name(ZFS_PROP_SNAPDIR), 574 snapdir_changed_cb, zfsvfs); 575 (void) dsl_prop_unregister(ds, zfs_prop_to_name(ZFS_PROP_ACLMODE), 576 acl_mode_changed_cb, zfsvfs); 577 (void) dsl_prop_unregister(ds, zfs_prop_to_name(ZFS_PROP_ACLINHERIT), 578 acl_inherit_changed_cb, zfsvfs); 579 (void) dsl_prop_unregister(ds, zfs_prop_to_name(ZFS_PROP_VSCAN), 580 vscan_changed_cb, zfsvfs); 581 return (error); 582} 583 584static int 585zfs_space_delta_cb(dmu_object_type_t bonustype, void *data, 586 uint64_t *userp, uint64_t *groupp) 587{ 588 /* 589 * Is it a valid type of object to track? 590 */ 591 if (bonustype != DMU_OT_ZNODE && bonustype != DMU_OT_SA) 592 return (SET_ERROR(ENOENT)); 593 594 /* 595 * If we have a NULL data pointer 596 * then assume the id's aren't changing and 597 * return EEXIST to the dmu to let it know to 598 * use the same ids 599 */ 600 if (data == NULL) 601 return (SET_ERROR(EEXIST)); 602 603 if (bonustype == DMU_OT_ZNODE) { 604 znode_phys_t *znp = data; 605 *userp = znp->zp_uid; 606 *groupp = znp->zp_gid; 607 } else { 608 int hdrsize; 609 sa_hdr_phys_t *sap = data; 610 sa_hdr_phys_t sa = *sap; 611 boolean_t swap = B_FALSE; 612 613 ASSERT(bonustype == DMU_OT_SA); 614 615 if (sa.sa_magic == 0) { 616 /* 617 * This should only happen for newly created 618 * files that haven't had the znode data filled 619 * in yet. 620 */ 621 *userp = 0; 622 *groupp = 0; 623 return (0); 624 } 625 if (sa.sa_magic == BSWAP_32(SA_MAGIC)) { 626 sa.sa_magic = SA_MAGIC; 627 sa.sa_layout_info = BSWAP_16(sa.sa_layout_info); 628 swap = B_TRUE; 629 } else { 630 VERIFY3U(sa.sa_magic, ==, SA_MAGIC); 631 } 632 633 hdrsize = sa_hdrsize(&sa); 634 VERIFY3U(hdrsize, >=, sizeof (sa_hdr_phys_t)); 635 *userp = *((uint64_t *)((uintptr_t)data + hdrsize + 636 SA_UID_OFFSET)); 637 *groupp = *((uint64_t *)((uintptr_t)data + hdrsize + 638 SA_GID_OFFSET)); 639 if (swap) { 640 *userp = BSWAP_64(*userp); 641 *groupp = BSWAP_64(*groupp); 642 } 643 } 644 return (0); 645} 646 647static void 648fuidstr_to_sid(zfsvfs_t *zfsvfs, const char *fuidstr, 649 char *domainbuf, int buflen, uid_t *ridp) 650{ 651 uint64_t fuid; 652 const char *domain; 653 654 fuid = strtonum(fuidstr, NULL); 655 656 domain = zfs_fuid_find_by_idx(zfsvfs, FUID_INDEX(fuid)); 657 if (domain) 658 (void) strlcpy(domainbuf, domain, buflen); 659 else 660 domainbuf[0] = '\0'; 661 *ridp = FUID_RID(fuid); 662} 663 664static uint64_t 665zfs_userquota_prop_to_obj(zfsvfs_t *zfsvfs, zfs_userquota_prop_t type) 666{ 667 switch (type) { 668 case ZFS_PROP_USERUSED: 669 return (DMU_USERUSED_OBJECT); 670 case ZFS_PROP_GROUPUSED: 671 return (DMU_GROUPUSED_OBJECT); 672 case ZFS_PROP_USERQUOTA: 673 return (zfsvfs->z_userquota_obj); 674 case ZFS_PROP_GROUPQUOTA: 675 return (zfsvfs->z_groupquota_obj); 676 } 677 return (0); 678} 679 680int 681zfs_userspace_many(zfsvfs_t *zfsvfs, zfs_userquota_prop_t type, 682 uint64_t *cookiep, void *vbuf, uint64_t *bufsizep) 683{ 684 int error; 685 zap_cursor_t zc; 686 zap_attribute_t za; 687 zfs_useracct_t *buf = vbuf; 688 uint64_t obj; 689 690 if (!dmu_objset_userspace_present(zfsvfs->z_os)) 691 return (SET_ERROR(ENOTSUP)); 692 693 obj = zfs_userquota_prop_to_obj(zfsvfs, type); 694 if (obj == 0) { 695 *bufsizep = 0; 696 return (0); 697 } 698 699 for (zap_cursor_init_serialized(&zc, zfsvfs->z_os, obj, *cookiep); 700 (error = zap_cursor_retrieve(&zc, &za)) == 0; 701 zap_cursor_advance(&zc)) { 702 if ((uintptr_t)buf - (uintptr_t)vbuf + sizeof (zfs_useracct_t) > 703 *bufsizep) 704 break; 705 706 fuidstr_to_sid(zfsvfs, za.za_name, 707 buf->zu_domain, sizeof (buf->zu_domain), &buf->zu_rid); 708 709 buf->zu_space = za.za_first_integer; 710 buf++; 711 } 712 if (error == ENOENT) 713 error = 0; 714 715 ASSERT3U((uintptr_t)buf - (uintptr_t)vbuf, <=, *bufsizep); 716 *bufsizep = (uintptr_t)buf - (uintptr_t)vbuf; 717 *cookiep = zap_cursor_serialize(&zc); 718 zap_cursor_fini(&zc); 719 return (error); 720} 721 722/* 723 * buf must be big enough (eg, 32 bytes) 724 */ 725static int 726id_to_fuidstr(zfsvfs_t *zfsvfs, const char *domain, uid_t rid, 727 char *buf, boolean_t addok) 728{ 729 uint64_t fuid; 730 int domainid = 0; 731 732 if (domain && domain[0]) { 733 domainid = zfs_fuid_find_by_domain(zfsvfs, domain, NULL, addok); 734 if (domainid == -1) 735 return (SET_ERROR(ENOENT)); 736 } 737 fuid = FUID_ENCODE(domainid, rid); 738 (void) sprintf(buf, "%llx", (longlong_t)fuid); 739 return (0); 740} 741 742int 743zfs_userspace_one(zfsvfs_t *zfsvfs, zfs_userquota_prop_t type, 744 const char *domain, uint64_t rid, uint64_t *valp) 745{ 746 char buf[32]; 747 int err; 748 uint64_t obj; 749 750 *valp = 0; 751 752 if (!dmu_objset_userspace_present(zfsvfs->z_os)) 753 return (SET_ERROR(ENOTSUP)); 754 755 obj = zfs_userquota_prop_to_obj(zfsvfs, type); 756 if (obj == 0) 757 return (0); 758 759 err = id_to_fuidstr(zfsvfs, domain, rid, buf, B_FALSE); 760 if (err) 761 return (err); 762 763 err = zap_lookup(zfsvfs->z_os, obj, buf, 8, 1, valp); 764 if (err == ENOENT) 765 err = 0; 766 return (err); 767} 768 769int 770zfs_set_userquota(zfsvfs_t *zfsvfs, zfs_userquota_prop_t type, 771 const char *domain, uint64_t rid, uint64_t quota) 772{ 773 char buf[32]; 774 int err; 775 dmu_tx_t *tx; 776 uint64_t *objp; 777 boolean_t fuid_dirtied; 778 779 if (type != ZFS_PROP_USERQUOTA && type != ZFS_PROP_GROUPQUOTA) 780 return (SET_ERROR(EINVAL)); 781 782 if (zfsvfs->z_version < ZPL_VERSION_USERSPACE) 783 return (SET_ERROR(ENOTSUP)); 784 785 objp = (type == ZFS_PROP_USERQUOTA) ? &zfsvfs->z_userquota_obj : 786 &zfsvfs->z_groupquota_obj; 787 788 err = id_to_fuidstr(zfsvfs, domain, rid, buf, B_TRUE); 789 if (err) 790 return (err); 791 fuid_dirtied = zfsvfs->z_fuid_dirty; 792 793 tx = dmu_tx_create(zfsvfs->z_os); 794 dmu_tx_hold_zap(tx, *objp ? *objp : DMU_NEW_OBJECT, B_TRUE, NULL); 795 if (*objp == 0) { 796 dmu_tx_hold_zap(tx, MASTER_NODE_OBJ, B_TRUE, 797 zfs_userquota_prop_prefixes[type]); 798 } 799 if (fuid_dirtied) 800 zfs_fuid_txhold(zfsvfs, tx); 801 err = dmu_tx_assign(tx, TXG_WAIT); 802 if (err) { 803 dmu_tx_abort(tx); 804 return (err); 805 } 806 807 mutex_enter(&zfsvfs->z_lock); 808 if (*objp == 0) { 809 *objp = zap_create(zfsvfs->z_os, DMU_OT_USERGROUP_QUOTA, 810 DMU_OT_NONE, 0, tx); 811 VERIFY(0 == zap_add(zfsvfs->z_os, MASTER_NODE_OBJ, 812 zfs_userquota_prop_prefixes[type], 8, 1, objp, tx)); 813 } 814 mutex_exit(&zfsvfs->z_lock); 815 816 if (quota == 0) { 817 err = zap_remove(zfsvfs->z_os, *objp, buf, tx); 818 if (err == ENOENT) 819 err = 0; 820 } else { 821 err = zap_update(zfsvfs->z_os, *objp, buf, 8, 1, "a, tx); 822 } 823 ASSERT(err == 0); 824 if (fuid_dirtied) 825 zfs_fuid_sync(zfsvfs, tx); 826 dmu_tx_commit(tx); 827 return (err); 828} 829 830boolean_t 831zfs_fuid_overquota(zfsvfs_t *zfsvfs, boolean_t isgroup, uint64_t fuid) 832{ 833 char buf[32]; 834 uint64_t used, quota, usedobj, quotaobj; 835 int err; 836 837 usedobj = isgroup ? DMU_GROUPUSED_OBJECT : DMU_USERUSED_OBJECT; 838 quotaobj = isgroup ? zfsvfs->z_groupquota_obj : zfsvfs->z_userquota_obj; 839 840 if (quotaobj == 0 || zfsvfs->z_replay) 841 return (B_FALSE); 842 843 (void) sprintf(buf, "%llx", (longlong_t)fuid); 844 err = zap_lookup(zfsvfs->z_os, quotaobj, buf, 8, 1, "a); 845 if (err != 0) 846 return (B_FALSE); 847 848 err = zap_lookup(zfsvfs->z_os, usedobj, buf, 8, 1, &used); 849 if (err != 0) 850 return (B_FALSE); 851 return (used >= quota); 852} 853 854boolean_t 855zfs_owner_overquota(zfsvfs_t *zfsvfs, znode_t *zp, boolean_t isgroup) 856{ 857 uint64_t fuid; 858 uint64_t quotaobj; 859 860 quotaobj = isgroup ? zfsvfs->z_groupquota_obj : zfsvfs->z_userquota_obj; 861 862 fuid = isgroup ? zp->z_gid : zp->z_uid; 863 864 if (quotaobj == 0 || zfsvfs->z_replay) 865 return (B_FALSE); 866 867 return (zfs_fuid_overquota(zfsvfs, isgroup, fuid)); 868} 869 870int 871zfsvfs_create(const char *osname, zfsvfs_t **zfvp) 872{ 873 objset_t *os; 874 zfsvfs_t *zfsvfs; 875 uint64_t zval; 876 int i, error; 877 uint64_t sa_obj; 878 879 zfsvfs = kmem_zalloc(sizeof (zfsvfs_t), KM_SLEEP); 880 881 /* 882 * We claim to always be readonly so we can open snapshots; 883 * other ZPL code will prevent us from writing to snapshots. 884 */ 885 error = dmu_objset_own(osname, DMU_OST_ZFS, B_TRUE, zfsvfs, &os); 886 if (error) { 887 kmem_free(zfsvfs, sizeof (zfsvfs_t)); 888 return (error); 889 } 890 891 /* 892 * Initialize the zfs-specific filesystem structure. 893 * Should probably make this a kmem cache, shuffle fields, 894 * and just bzero up to z_hold_mtx[]. 895 */ 896 zfsvfs->z_vfs = NULL; 897 zfsvfs->z_parent = zfsvfs; 898 zfsvfs->z_max_blksz = SPA_OLD_MAXBLOCKSIZE; 899 zfsvfs->z_show_ctldir = ZFS_SNAPDIR_VISIBLE; 900 zfsvfs->z_os = os; 901 902 error = zfs_get_zplprop(os, ZFS_PROP_VERSION, &zfsvfs->z_version); 903 if (error) { 904 goto out; 905 } else if (zfsvfs->z_version > 906 zfs_zpl_version_map(spa_version(dmu_objset_spa(os)))) { 907 (void) printf("Can't mount a version %lld file system " 908 "on a version %lld pool\n. Pool must be upgraded to mount " 909 "this file system.", (u_longlong_t)zfsvfs->z_version, 910 (u_longlong_t)spa_version(dmu_objset_spa(os))); 911 error = SET_ERROR(ENOTSUP); 912 goto out; 913 } 914 if ((error = zfs_get_zplprop(os, ZFS_PROP_NORMALIZE, &zval)) != 0) 915 goto out; 916 zfsvfs->z_norm = (int)zval; 917 918 if ((error = zfs_get_zplprop(os, ZFS_PROP_UTF8ONLY, &zval)) != 0) 919 goto out; 920 zfsvfs->z_utf8 = (zval != 0); 921 922 if ((error = zfs_get_zplprop(os, ZFS_PROP_CASE, &zval)) != 0) 923 goto out; 924 zfsvfs->z_case = (uint_t)zval; 925 926 /* 927 * Fold case on file systems that are always or sometimes case 928 * insensitive. 929 */ 930 if (zfsvfs->z_case == ZFS_CASE_INSENSITIVE || 931 zfsvfs->z_case == ZFS_CASE_MIXED) 932 zfsvfs->z_norm |= U8_TEXTPREP_TOUPPER; 933 934 zfsvfs->z_use_fuids = USE_FUIDS(zfsvfs->z_version, zfsvfs->z_os); 935 zfsvfs->z_use_sa = USE_SA(zfsvfs->z_version, zfsvfs->z_os); 936 937 if (zfsvfs->z_use_sa) { 938 /* should either have both of these objects or none */ 939 error = zap_lookup(os, MASTER_NODE_OBJ, ZFS_SA_ATTRS, 8, 1, 940 &sa_obj); 941 if (error) 942 goto out; 943 } else { 944 /* 945 * Pre SA versions file systems should never touch 946 * either the attribute registration or layout objects. 947 */ 948 sa_obj = 0; 949 } 950 951 error = sa_setup(os, sa_obj, zfs_attr_table, ZPL_END, 952 &zfsvfs->z_attr_table); 953 if (error) 954 goto out; 955 956 if (zfsvfs->z_version >= ZPL_VERSION_SA) 957 sa_register_update_callback(os, zfs_sa_upgrade); 958 959 error = zap_lookup(os, MASTER_NODE_OBJ, ZFS_ROOT_OBJ, 8, 1, 960 &zfsvfs->z_root); 961 if (error) 962 goto out; 963 ASSERT(zfsvfs->z_root != 0); 964 965 error = zap_lookup(os, MASTER_NODE_OBJ, ZFS_UNLINKED_SET, 8, 1, 966 &zfsvfs->z_unlinkedobj); 967 if (error) 968 goto out; 969 970 error = zap_lookup(os, MASTER_NODE_OBJ, 971 zfs_userquota_prop_prefixes[ZFS_PROP_USERQUOTA], 972 8, 1, &zfsvfs->z_userquota_obj); 973 if (error && error != ENOENT) 974 goto out; 975 976 error = zap_lookup(os, MASTER_NODE_OBJ, 977 zfs_userquota_prop_prefixes[ZFS_PROP_GROUPQUOTA], 978 8, 1, &zfsvfs->z_groupquota_obj); 979 if (error && error != ENOENT) 980 goto out; 981 982 error = zap_lookup(os, MASTER_NODE_OBJ, ZFS_FUID_TABLES, 8, 1, 983 &zfsvfs->z_fuid_obj); 984 if (error && error != ENOENT) 985 goto out; 986 987 error = zap_lookup(os, MASTER_NODE_OBJ, ZFS_SHARES_DIR, 8, 1, 988 &zfsvfs->z_shares_dir); 989 if (error && error != ENOENT) 990 goto out; 991 992 mutex_init(&zfsvfs->z_znodes_lock, NULL, MUTEX_DEFAULT, NULL); 993 mutex_init(&zfsvfs->z_lock, NULL, MUTEX_DEFAULT, NULL); 994 list_create(&zfsvfs->z_all_znodes, sizeof (znode_t), 995 offsetof(znode_t, z_link_node)); 996 rrm_init(&zfsvfs->z_teardown_lock, B_FALSE); 997 rw_init(&zfsvfs->z_teardown_inactive_lock, NULL, RW_DEFAULT, NULL); 998 rw_init(&zfsvfs->z_fuid_lock, NULL, RW_DEFAULT, NULL); 999 for (i = 0; i != ZFS_OBJ_MTX_SZ; i++) 1000 mutex_init(&zfsvfs->z_hold_mtx[i], NULL, MUTEX_DEFAULT, NULL); 1001 1002 *zfvp = zfsvfs; 1003 return (0); 1004 1005out: 1006 dmu_objset_disown(os, zfsvfs); 1007 *zfvp = NULL; 1008 kmem_free(zfsvfs, sizeof (zfsvfs_t)); 1009 return (error); 1010} 1011 1012static int 1013zfsvfs_setup(zfsvfs_t *zfsvfs, boolean_t mounting) 1014{ 1015 int error; 1016 1017 error = zfs_register_callbacks(zfsvfs->z_vfs); 1018 if (error) 1019 return (error); 1020 1021 /* 1022 * Set the objset user_ptr to track its zfsvfs. 1023 */ 1024 mutex_enter(&zfsvfs->z_os->os_user_ptr_lock); 1025 dmu_objset_set_user(zfsvfs->z_os, zfsvfs); 1026 mutex_exit(&zfsvfs->z_os->os_user_ptr_lock); 1027 1028 zfsvfs->z_log = zil_open(zfsvfs->z_os, zfs_get_data); 1029 1030 /* 1031 * If we are not mounting (ie: online recv), then we don't 1032 * have to worry about replaying the log as we blocked all 1033 * operations out since we closed the ZIL. 1034 */ 1035 if (mounting) { 1036 boolean_t readonly; 1037 1038 /* 1039 * During replay we remove the read only flag to 1040 * allow replays to succeed. 1041 */ 1042 readonly = zfsvfs->z_vfs->vfs_flag & VFS_RDONLY; 1043 if (readonly != 0) 1044 zfsvfs->z_vfs->vfs_flag &= ~VFS_RDONLY; 1045 else 1046 zfs_unlinked_drain(zfsvfs); 1047 1048 /* 1049 * Parse and replay the intent log. 1050 * 1051 * Because of ziltest, this must be done after 1052 * zfs_unlinked_drain(). (Further note: ziltest 1053 * doesn't use readonly mounts, where 1054 * zfs_unlinked_drain() isn't called.) This is because 1055 * ziltest causes spa_sync() to think it's committed, 1056 * but actually it is not, so the intent log contains 1057 * many txg's worth of changes. 1058 * 1059 * In particular, if object N is in the unlinked set in 1060 * the last txg to actually sync, then it could be 1061 * actually freed in a later txg and then reallocated 1062 * in a yet later txg. This would write a "create 1063 * object N" record to the intent log. Normally, this 1064 * would be fine because the spa_sync() would have 1065 * written out the fact that object N is free, before 1066 * we could write the "create object N" intent log 1067 * record. 1068 * 1069 * But when we are in ziltest mode, we advance the "open 1070 * txg" without actually spa_sync()-ing the changes to 1071 * disk. So we would see that object N is still 1072 * allocated and in the unlinked set, and there is an 1073 * intent log record saying to allocate it. 1074 */ 1075 if (spa_writeable(dmu_objset_spa(zfsvfs->z_os))) { 1076 if (zil_replay_disable) { 1077 zil_destroy(zfsvfs->z_log, B_FALSE); 1078 } else { 1079 zfsvfs->z_replay = B_TRUE; 1080 zil_replay(zfsvfs->z_os, zfsvfs, 1081 zfs_replay_vector); 1082 zfsvfs->z_replay = B_FALSE; 1083 } 1084 } 1085 zfsvfs->z_vfs->vfs_flag |= readonly; /* restore readonly bit */ 1086 } 1087 1088 return (0); 1089} 1090 1091extern krwlock_t zfsvfs_lock; /* in zfs_znode.c */ 1092 1093void 1094zfsvfs_free(zfsvfs_t *zfsvfs) 1095{ 1096 int i; 1097 1098 /* 1099 * This is a barrier to prevent the filesystem from going away in 1100 * zfs_znode_move() until we can safely ensure that the filesystem is 1101 * not unmounted. We consider the filesystem valid before the barrier 1102 * and invalid after the barrier. 1103 */ 1104 rw_enter(&zfsvfs_lock, RW_READER); 1105 rw_exit(&zfsvfs_lock); 1106 1107 zfs_fuid_destroy(zfsvfs); 1108 1109 mutex_destroy(&zfsvfs->z_znodes_lock); 1110 mutex_destroy(&zfsvfs->z_lock); 1111 list_destroy(&zfsvfs->z_all_znodes); 1112 rrm_destroy(&zfsvfs->z_teardown_lock); 1113 rw_destroy(&zfsvfs->z_teardown_inactive_lock); 1114 rw_destroy(&zfsvfs->z_fuid_lock); 1115 for (i = 0; i != ZFS_OBJ_MTX_SZ; i++) 1116 mutex_destroy(&zfsvfs->z_hold_mtx[i]); 1117 kmem_free(zfsvfs, sizeof (zfsvfs_t)); 1118} 1119 1120static void 1121zfs_set_fuid_feature(zfsvfs_t *zfsvfs) 1122{ 1123 zfsvfs->z_use_fuids = USE_FUIDS(zfsvfs->z_version, zfsvfs->z_os); 1124 if (zfsvfs->z_vfs) { 1125 if (zfsvfs->z_use_fuids) { 1126 vfs_set_feature(zfsvfs->z_vfs, VFSFT_XVATTR); 1127 vfs_set_feature(zfsvfs->z_vfs, VFSFT_SYSATTR_VIEWS); 1128 vfs_set_feature(zfsvfs->z_vfs, VFSFT_ACEMASKONACCESS); 1129 vfs_set_feature(zfsvfs->z_vfs, VFSFT_ACLONCREATE); 1130 vfs_set_feature(zfsvfs->z_vfs, VFSFT_ACCESS_FILTER); 1131 vfs_set_feature(zfsvfs->z_vfs, VFSFT_REPARSE); 1132 } else { 1133 vfs_clear_feature(zfsvfs->z_vfs, VFSFT_XVATTR); 1134 vfs_clear_feature(zfsvfs->z_vfs, VFSFT_SYSATTR_VIEWS); 1135 vfs_clear_feature(zfsvfs->z_vfs, VFSFT_ACEMASKONACCESS); 1136 vfs_clear_feature(zfsvfs->z_vfs, VFSFT_ACLONCREATE); 1137 vfs_clear_feature(zfsvfs->z_vfs, VFSFT_ACCESS_FILTER); 1138 vfs_clear_feature(zfsvfs->z_vfs, VFSFT_REPARSE); 1139 } 1140 } 1141 zfsvfs->z_use_sa = USE_SA(zfsvfs->z_version, zfsvfs->z_os); 1142} 1143 1144static int 1145zfs_domount(vfs_t *vfsp, char *osname) 1146{ 1147 uint64_t recordsize, fsid_guid; 1148 int error = 0; 1149 zfsvfs_t *zfsvfs; 1150 vnode_t *vp; 1151 1152 ASSERT(vfsp); 1153 ASSERT(osname); 1154 1155 error = zfsvfs_create(osname, &zfsvfs); 1156 if (error) 1157 return (error); 1158 zfsvfs->z_vfs = vfsp; 1159 1160#ifdef illumos 1161 /* Initialize the generic filesystem structure. */ 1162 vfsp->vfs_bcount = 0; 1163 vfsp->vfs_data = NULL; 1164 1165 if (zfs_create_unique_device(&mount_dev) == -1) { 1166 error = SET_ERROR(ENODEV); 1167 goto out; 1168 } 1169 ASSERT(vfs_devismounted(mount_dev) == 0); 1170#endif 1171 1172 if (error = dsl_prop_get_integer(osname, "recordsize", &recordsize, 1173 NULL)) 1174 goto out; 1175 zfsvfs->z_vfs->vfs_bsize = SPA_MINBLOCKSIZE; 1176 zfsvfs->z_vfs->mnt_stat.f_iosize = recordsize; 1177 1178 vfsp->vfs_data = zfsvfs; 1179 vfsp->mnt_flag |= MNT_LOCAL; 1180 vfsp->mnt_kern_flag |= MNTK_LOOKUP_SHARED; 1181 vfsp->mnt_kern_flag |= MNTK_SHARED_WRITES; 1182 vfsp->mnt_kern_flag |= MNTK_EXTENDED_SHARED; 1183 1184 /* 1185 * The fsid is 64 bits, composed of an 8-bit fs type, which 1186 * separates our fsid from any other filesystem types, and a 1187 * 56-bit objset unique ID. The objset unique ID is unique to 1188 * all objsets open on this system, provided by unique_create(). 1189 * The 8-bit fs type must be put in the low bits of fsid[1] 1190 * because that's where other Solaris filesystems put it. 1191 */ 1192 fsid_guid = dmu_objset_fsid_guid(zfsvfs->z_os); 1193 ASSERT((fsid_guid & ~((1ULL<<56)-1)) == 0); 1194 vfsp->vfs_fsid.val[0] = fsid_guid; 1195 vfsp->vfs_fsid.val[1] = ((fsid_guid>>32) << 8) | 1196 vfsp->mnt_vfc->vfc_typenum & 0xFF; 1197 1198 /* 1199 * Set features for file system. 1200 */ 1201 zfs_set_fuid_feature(zfsvfs); 1202 if (zfsvfs->z_case == ZFS_CASE_INSENSITIVE) { 1203 vfs_set_feature(vfsp, VFSFT_DIRENTFLAGS); 1204 vfs_set_feature(vfsp, VFSFT_CASEINSENSITIVE); 1205 vfs_set_feature(vfsp, VFSFT_NOCASESENSITIVE); 1206 } else if (zfsvfs->z_case == ZFS_CASE_MIXED) { 1207 vfs_set_feature(vfsp, VFSFT_DIRENTFLAGS); 1208 vfs_set_feature(vfsp, VFSFT_CASEINSENSITIVE); 1209 } 1210 vfs_set_feature(vfsp, VFSFT_ZEROCOPY_SUPPORTED); 1211 1212 if (dmu_objset_is_snapshot(zfsvfs->z_os)) { 1213 uint64_t pval; 1214 1215 atime_changed_cb(zfsvfs, B_FALSE); 1216 readonly_changed_cb(zfsvfs, B_TRUE); 1217 if (error = dsl_prop_get_integer(osname, "xattr", &pval, NULL)) 1218 goto out; 1219 xattr_changed_cb(zfsvfs, pval); 1220 zfsvfs->z_issnap = B_TRUE; 1221 zfsvfs->z_os->os_sync = ZFS_SYNC_DISABLED; 1222 1223 mutex_enter(&zfsvfs->z_os->os_user_ptr_lock); 1224 dmu_objset_set_user(zfsvfs->z_os, zfsvfs); 1225 mutex_exit(&zfsvfs->z_os->os_user_ptr_lock); 1226 } else { 1227 error = zfsvfs_setup(zfsvfs, B_TRUE); 1228 } 1229 1230 vfs_mountedfrom(vfsp, osname); 1231 1232 if (!zfsvfs->z_issnap) 1233 zfsctl_create(zfsvfs); 1234out: 1235 if (error) { 1236 dmu_objset_disown(zfsvfs->z_os, zfsvfs); 1237 zfsvfs_free(zfsvfs); 1238 } else { 1239 atomic_inc_32(&zfs_active_fs_count); 1240 } 1241 1242 return (error); 1243} 1244 1245void 1246zfs_unregister_callbacks(zfsvfs_t *zfsvfs) 1247{ 1248 objset_t *os = zfsvfs->z_os; 1249 struct dsl_dataset *ds; 1250 1251 /* 1252 * Unregister properties. 1253 */ 1254 if (!dmu_objset_is_snapshot(os)) { 1255 ds = dmu_objset_ds(os); 1256 VERIFY(dsl_prop_unregister(ds, "atime", atime_changed_cb, 1257 zfsvfs) == 0); 1258 1259 VERIFY(dsl_prop_unregister(ds, "xattr", xattr_changed_cb, 1260 zfsvfs) == 0); 1261 1262 VERIFY(dsl_prop_unregister(ds, "recordsize", blksz_changed_cb, 1263 zfsvfs) == 0); 1264 1265 VERIFY(dsl_prop_unregister(ds, "readonly", readonly_changed_cb, 1266 zfsvfs) == 0); 1267 1268 VERIFY(dsl_prop_unregister(ds, "setuid", setuid_changed_cb, 1269 zfsvfs) == 0); 1270 1271 VERIFY(dsl_prop_unregister(ds, "exec", exec_changed_cb, 1272 zfsvfs) == 0); 1273 1274 VERIFY(dsl_prop_unregister(ds, "snapdir", snapdir_changed_cb, 1275 zfsvfs) == 0); 1276 1277 VERIFY(dsl_prop_unregister(ds, "aclmode", acl_mode_changed_cb, 1278 zfsvfs) == 0); 1279 1280 VERIFY(dsl_prop_unregister(ds, "aclinherit", 1281 acl_inherit_changed_cb, zfsvfs) == 0); 1282 1283 VERIFY(dsl_prop_unregister(ds, "vscan", 1284 vscan_changed_cb, zfsvfs) == 0); 1285 } 1286} 1287 1288#ifdef SECLABEL 1289/* 1290 * Convert a decimal digit string to a uint64_t integer. 1291 */ 1292static int 1293str_to_uint64(char *str, uint64_t *objnum) 1294{ 1295 uint64_t num = 0; 1296 1297 while (*str) { 1298 if (*str < '0' || *str > '9') 1299 return (SET_ERROR(EINVAL)); 1300 1301 num = num*10 + *str++ - '0'; 1302 } 1303 1304 *objnum = num; 1305 return (0); 1306} 1307 1308/* 1309 * The boot path passed from the boot loader is in the form of 1310 * "rootpool-name/root-filesystem-object-number'. Convert this 1311 * string to a dataset name: "rootpool-name/root-filesystem-name". 1312 */ 1313static int 1314zfs_parse_bootfs(char *bpath, char *outpath) 1315{ 1316 char *slashp; 1317 uint64_t objnum; 1318 int error; 1319 1320 if (*bpath == 0 || *bpath == '/') 1321 return (SET_ERROR(EINVAL)); 1322 1323 (void) strcpy(outpath, bpath); 1324 1325 slashp = strchr(bpath, '/'); 1326 1327 /* if no '/', just return the pool name */ 1328 if (slashp == NULL) { 1329 return (0); 1330 } 1331 1332 /* if not a number, just return the root dataset name */ 1333 if (str_to_uint64(slashp+1, &objnum)) { 1334 return (0); 1335 } 1336 1337 *slashp = '\0'; 1338 error = dsl_dsobj_to_dsname(bpath, objnum, outpath); 1339 *slashp = '/'; 1340 1341 return (error); 1342} 1343 1344/* 1345 * Check that the hex label string is appropriate for the dataset being 1346 * mounted into the global_zone proper. 1347 * 1348 * Return an error if the hex label string is not default or 1349 * admin_low/admin_high. For admin_low labels, the corresponding 1350 * dataset must be readonly. 1351 */ 1352int 1353zfs_check_global_label(const char *dsname, const char *hexsl) 1354{ 1355 if (strcasecmp(hexsl, ZFS_MLSLABEL_DEFAULT) == 0) 1356 return (0); 1357 if (strcasecmp(hexsl, ADMIN_HIGH) == 0) 1358 return (0); 1359 if (strcasecmp(hexsl, ADMIN_LOW) == 0) { 1360 /* must be readonly */ 1361 uint64_t rdonly; 1362 1363 if (dsl_prop_get_integer(dsname, 1364 zfs_prop_to_name(ZFS_PROP_READONLY), &rdonly, NULL)) 1365 return (SET_ERROR(EACCES)); 1366 return (rdonly ? 0 : EACCES); 1367 } 1368 return (SET_ERROR(EACCES)); 1369} 1370 1371/* 1372 * Determine whether the mount is allowed according to MAC check. 1373 * by comparing (where appropriate) label of the dataset against 1374 * the label of the zone being mounted into. If the dataset has 1375 * no label, create one. 1376 * 1377 * Returns 0 if access allowed, error otherwise (e.g. EACCES) 1378 */ 1379static int 1380zfs_mount_label_policy(vfs_t *vfsp, char *osname) 1381{ 1382 int error, retv; 1383 zone_t *mntzone = NULL; 1384 ts_label_t *mnt_tsl; 1385 bslabel_t *mnt_sl; 1386 bslabel_t ds_sl; 1387 char ds_hexsl[MAXNAMELEN]; 1388 1389 retv = EACCES; /* assume the worst */ 1390 1391 /* 1392 * Start by getting the dataset label if it exists. 1393 */ 1394 error = dsl_prop_get(osname, zfs_prop_to_name(ZFS_PROP_MLSLABEL), 1395 1, sizeof (ds_hexsl), &ds_hexsl, NULL); 1396 if (error) 1397 return (SET_ERROR(EACCES)); 1398 1399 /* 1400 * If labeling is NOT enabled, then disallow the mount of datasets 1401 * which have a non-default label already. No other label checks 1402 * are needed. 1403 */ 1404 if (!is_system_labeled()) { 1405 if (strcasecmp(ds_hexsl, ZFS_MLSLABEL_DEFAULT) == 0) 1406 return (0); 1407 return (SET_ERROR(EACCES)); 1408 } 1409 1410 /* 1411 * Get the label of the mountpoint. If mounting into the global 1412 * zone (i.e. mountpoint is not within an active zone and the 1413 * zoned property is off), the label must be default or 1414 * admin_low/admin_high only; no other checks are needed. 1415 */ 1416 mntzone = zone_find_by_any_path(refstr_value(vfsp->vfs_mntpt), B_FALSE); 1417 if (mntzone->zone_id == GLOBAL_ZONEID) { 1418 uint64_t zoned; 1419 1420 zone_rele(mntzone); 1421 1422 if (dsl_prop_get_integer(osname, 1423 zfs_prop_to_name(ZFS_PROP_ZONED), &zoned, NULL)) 1424 return (SET_ERROR(EACCES)); 1425 if (!zoned) 1426 return (zfs_check_global_label(osname, ds_hexsl)); 1427 else 1428 /* 1429 * This is the case of a zone dataset being mounted 1430 * initially, before the zone has been fully created; 1431 * allow this mount into global zone. 1432 */ 1433 return (0); 1434 } 1435 1436 mnt_tsl = mntzone->zone_slabel; 1437 ASSERT(mnt_tsl != NULL); 1438 label_hold(mnt_tsl); 1439 mnt_sl = label2bslabel(mnt_tsl); 1440 1441 if (strcasecmp(ds_hexsl, ZFS_MLSLABEL_DEFAULT) == 0) { 1442 /* 1443 * The dataset doesn't have a real label, so fabricate one. 1444 */ 1445 char *str = NULL; 1446 1447 if (l_to_str_internal(mnt_sl, &str) == 0 && 1448 dsl_prop_set_string(osname, 1449 zfs_prop_to_name(ZFS_PROP_MLSLABEL), 1450 ZPROP_SRC_LOCAL, str) == 0) 1451 retv = 0; 1452 if (str != NULL) 1453 kmem_free(str, strlen(str) + 1); 1454 } else if (hexstr_to_label(ds_hexsl, &ds_sl) == 0) { 1455 /* 1456 * Now compare labels to complete the MAC check. If the 1457 * labels are equal then allow access. If the mountpoint 1458 * label dominates the dataset label, allow readonly access. 1459 * Otherwise, access is denied. 1460 */ 1461 if (blequal(mnt_sl, &ds_sl)) 1462 retv = 0; 1463 else if (bldominates(mnt_sl, &ds_sl)) { 1464 vfs_setmntopt(vfsp, MNTOPT_RO, NULL, 0); 1465 retv = 0; 1466 } 1467 } 1468 1469 label_rele(mnt_tsl); 1470 zone_rele(mntzone); 1471 return (retv); 1472} 1473#endif /* SECLABEL */ 1474 1475#ifdef OPENSOLARIS_MOUNTROOT 1476static int 1477zfs_mountroot(vfs_t *vfsp, enum whymountroot why) 1478{ 1479 int error = 0; 1480 static int zfsrootdone = 0; 1481 zfsvfs_t *zfsvfs = NULL; 1482 znode_t *zp = NULL; 1483 vnode_t *vp = NULL; 1484 char *zfs_bootfs; 1485 char *zfs_devid; 1486 1487 ASSERT(vfsp); 1488 1489 /* 1490 * The filesystem that we mount as root is defined in the 1491 * boot property "zfs-bootfs" with a format of 1492 * "poolname/root-dataset-objnum". 1493 */ 1494 if (why == ROOT_INIT) { 1495 if (zfsrootdone++) 1496 return (SET_ERROR(EBUSY)); 1497 /* 1498 * the process of doing a spa_load will require the 1499 * clock to be set before we could (for example) do 1500 * something better by looking at the timestamp on 1501 * an uberblock, so just set it to -1. 1502 */ 1503 clkset(-1); 1504 1505 if ((zfs_bootfs = spa_get_bootprop("zfs-bootfs")) == NULL) { 1506 cmn_err(CE_NOTE, "spa_get_bootfs: can not get " 1507 "bootfs name"); 1508 return (SET_ERROR(EINVAL)); 1509 } 1510 zfs_devid = spa_get_bootprop("diskdevid"); 1511 error = spa_import_rootpool(rootfs.bo_name, zfs_devid); 1512 if (zfs_devid) 1513 spa_free_bootprop(zfs_devid); 1514 if (error) { 1515 spa_free_bootprop(zfs_bootfs); 1516 cmn_err(CE_NOTE, "spa_import_rootpool: error %d", 1517 error); 1518 return (error); 1519 } 1520 if (error = zfs_parse_bootfs(zfs_bootfs, rootfs.bo_name)) { 1521 spa_free_bootprop(zfs_bootfs); 1522 cmn_err(CE_NOTE, "zfs_parse_bootfs: error %d", 1523 error); 1524 return (error); 1525 } 1526 1527 spa_free_bootprop(zfs_bootfs); 1528 1529 if (error = vfs_lock(vfsp)) 1530 return (error); 1531 1532 if (error = zfs_domount(vfsp, rootfs.bo_name)) { 1533 cmn_err(CE_NOTE, "zfs_domount: error %d", error); 1534 goto out; 1535 } 1536 1537 zfsvfs = (zfsvfs_t *)vfsp->vfs_data; 1538 ASSERT(zfsvfs); 1539 if (error = zfs_zget(zfsvfs, zfsvfs->z_root, &zp)) { 1540 cmn_err(CE_NOTE, "zfs_zget: error %d", error); 1541 goto out; 1542 } 1543 1544 vp = ZTOV(zp); 1545 mutex_enter(&vp->v_lock); 1546 vp->v_flag |= VROOT; 1547 mutex_exit(&vp->v_lock); 1548 rootvp = vp; 1549 1550 /* 1551 * Leave rootvp held. The root file system is never unmounted. 1552 */ 1553 1554 vfs_add((struct vnode *)0, vfsp, 1555 (vfsp->vfs_flag & VFS_RDONLY) ? MS_RDONLY : 0); 1556out: 1557 vfs_unlock(vfsp); 1558 return (error); 1559 } else if (why == ROOT_REMOUNT) { 1560 readonly_changed_cb(vfsp->vfs_data, B_FALSE); 1561 vfsp->vfs_flag |= VFS_REMOUNT; 1562 1563 /* refresh mount options */ 1564 zfs_unregister_callbacks(vfsp->vfs_data); 1565 return (zfs_register_callbacks(vfsp)); 1566 1567 } else if (why == ROOT_UNMOUNT) { 1568 zfs_unregister_callbacks((zfsvfs_t *)vfsp->vfs_data); 1569 (void) zfs_sync(vfsp, 0, 0); 1570 return (0); 1571 } 1572 1573 /* 1574 * if "why" is equal to anything else other than ROOT_INIT, 1575 * ROOT_REMOUNT, or ROOT_UNMOUNT, we do not support it. 1576 */ 1577 return (SET_ERROR(ENOTSUP)); 1578} 1579#endif /* OPENSOLARIS_MOUNTROOT */ 1580 1581static int 1582getpoolname(const char *osname, char *poolname) 1583{ 1584 char *p; 1585 1586 p = strchr(osname, '/'); 1587 if (p == NULL) { 1588 if (strlen(osname) >= MAXNAMELEN) 1589 return (ENAMETOOLONG); 1590 (void) strcpy(poolname, osname); 1591 } else { 1592 if (p - osname >= MAXNAMELEN) 1593 return (ENAMETOOLONG); 1594 (void) strncpy(poolname, osname, p - osname); 1595 poolname[p - osname] = '\0'; 1596 } 1597 return (0); 1598} 1599 1600/*ARGSUSED*/ 1601static int 1602zfs_mount(vfs_t *vfsp) 1603{ 1604 kthread_t *td = curthread; 1605 vnode_t *mvp = vfsp->mnt_vnodecovered; 1606 cred_t *cr = td->td_ucred; 1607 char *osname; 1608 int error = 0; 1609 int canwrite; 1610 1611#ifdef illumos 1612 if (mvp->v_type != VDIR) 1613 return (SET_ERROR(ENOTDIR)); 1614 1615 mutex_enter(&mvp->v_lock); 1616 if ((uap->flags & MS_REMOUNT) == 0 && 1617 (uap->flags & MS_OVERLAY) == 0 && 1618 (mvp->v_count != 1 || (mvp->v_flag & VROOT))) { 1619 mutex_exit(&mvp->v_lock); 1620 return (SET_ERROR(EBUSY)); 1621 } 1622 mutex_exit(&mvp->v_lock); 1623 1624 /* 1625 * ZFS does not support passing unparsed data in via MS_DATA. 1626 * Users should use the MS_OPTIONSTR interface; this means 1627 * that all option parsing is already done and the options struct 1628 * can be interrogated. 1629 */ 1630 if ((uap->flags & MS_DATA) && uap->datalen > 0) 1631#else 1632 if (!prison_allow(td->td_ucred, PR_ALLOW_MOUNT_ZFS)) 1633 return (SET_ERROR(EPERM)); 1634 1635 if (vfs_getopt(vfsp->mnt_optnew, "from", (void **)&osname, NULL)) 1636 return (SET_ERROR(EINVAL)); 1637#endif /* ! illumos */ 1638 1639 /* 1640 * If full-owner-access is enabled and delegated administration is 1641 * turned on, we must set nosuid. 1642 */ 1643 if (zfs_super_owner && 1644 dsl_deleg_access(osname, ZFS_DELEG_PERM_MOUNT, cr) != ECANCELED) { 1645 secpolicy_fs_mount_clearopts(cr, vfsp); 1646 } 1647 1648 /* 1649 * Check for mount privilege? 1650 * 1651 * If we don't have privilege then see if 1652 * we have local permission to allow it 1653 */ 1654 error = secpolicy_fs_mount(cr, mvp, vfsp); 1655 if (error) { 1656 if (dsl_deleg_access(osname, ZFS_DELEG_PERM_MOUNT, cr) != 0) 1657 goto out; 1658 1659 if (!(vfsp->vfs_flag & MS_REMOUNT)) { 1660 vattr_t vattr; 1661 1662 /* 1663 * Make sure user is the owner of the mount point 1664 * or has sufficient privileges. 1665 */ 1666 1667 vattr.va_mask = AT_UID; 1668 1669 vn_lock(mvp, LK_SHARED | LK_RETRY); 1670 if (VOP_GETATTR(mvp, &vattr, cr)) { 1671 VOP_UNLOCK(mvp, 0); 1672 goto out; 1673 } 1674 1675 if (secpolicy_vnode_owner(mvp, cr, vattr.va_uid) != 0 && 1676 VOP_ACCESS(mvp, VWRITE, cr, td) != 0) { 1677 VOP_UNLOCK(mvp, 0); 1678 goto out; 1679 } 1680 VOP_UNLOCK(mvp, 0); 1681 } 1682 1683 secpolicy_fs_mount_clearopts(cr, vfsp); 1684 } 1685 1686 /* 1687 * Refuse to mount a filesystem if we are in a local zone and the 1688 * dataset is not visible. 1689 */ 1690 if (!INGLOBALZONE(curthread) && 1691 (!zone_dataset_visible(osname, &canwrite) || !canwrite)) { 1692 error = SET_ERROR(EPERM); 1693 goto out; 1694 } 1695 1696#ifdef SECLABEL 1697 error = zfs_mount_label_policy(vfsp, osname); 1698 if (error) 1699 goto out; 1700#endif 1701 1702 vfsp->vfs_flag |= MNT_NFS4ACLS; 1703 1704 /* 1705 * When doing a remount, we simply refresh our temporary properties 1706 * according to those options set in the current VFS options. 1707 */ 1708 if (vfsp->vfs_flag & MS_REMOUNT) { 1709 zfsvfs_t *zfsvfs = vfsp->vfs_data; 1710 1711 /* 1712 * Refresh mount options with z_teardown_lock blocking I/O while 1713 * the filesystem is in an inconsistent state. 1714 * The lock also serializes this code with filesystem 1715 * manipulations between entry to zfs_suspend_fs() and return 1716 * from zfs_resume_fs(). 1717 */ 1718 rrm_enter(&zfsvfs->z_teardown_lock, RW_WRITER, FTAG); 1719 zfs_unregister_callbacks(zfsvfs); 1720 error = zfs_register_callbacks(vfsp); 1721 rrm_exit(&zfsvfs->z_teardown_lock, FTAG); 1722 goto out; 1723 } 1724 1725 /* Initial root mount: try hard to import the requested root pool. */ 1726 if ((vfsp->vfs_flag & MNT_ROOTFS) != 0 && 1727 (vfsp->vfs_flag & MNT_UPDATE) == 0) { 1728 char pname[MAXNAMELEN]; 1729 1730 error = getpoolname(osname, pname); 1731 if (error == 0) 1732 error = spa_import_rootpool(pname); 1733 if (error) 1734 goto out; 1735 } 1736 DROP_GIANT(); 1737 error = zfs_domount(vfsp, osname); 1738 PICKUP_GIANT(); 1739 1740#ifdef sun 1741 /* 1742 * Add an extra VFS_HOLD on our parent vfs so that it can't 1743 * disappear due to a forced unmount. 1744 */ 1745 if (error == 0 && ((zfsvfs_t *)vfsp->vfs_data)->z_issnap) 1746 VFS_HOLD(mvp->v_vfsp); 1747#endif /* sun */ 1748 1749out: 1750 return (error); 1751} 1752 1753static int 1754zfs_statfs(vfs_t *vfsp, struct statfs *statp) 1755{ 1756 zfsvfs_t *zfsvfs = vfsp->vfs_data; 1757 uint64_t refdbytes, availbytes, usedobjs, availobjs; 1758 1759 statp->f_version = STATFS_VERSION; 1760 1761 ZFS_ENTER(zfsvfs); 1762 1763 dmu_objset_space(zfsvfs->z_os, 1764 &refdbytes, &availbytes, &usedobjs, &availobjs); 1765 1766 /* 1767 * The underlying storage pool actually uses multiple block sizes. 1768 * We report the fragsize as the smallest block size we support, 1769 * and we report our blocksize as the filesystem's maximum blocksize. 1770 */ 1771 statp->f_bsize = SPA_MINBLOCKSIZE; 1772 statp->f_iosize = zfsvfs->z_vfs->mnt_stat.f_iosize; 1773 1774 /* 1775 * The following report "total" blocks of various kinds in the 1776 * file system, but reported in terms of f_frsize - the 1777 * "fragment" size. 1778 */ 1779 1780 statp->f_blocks = (refdbytes + availbytes) >> SPA_MINBLOCKSHIFT; 1781 statp->f_bfree = availbytes / statp->f_bsize; 1782 statp->f_bavail = statp->f_bfree; /* no root reservation */ 1783 1784 /* 1785 * statvfs() should really be called statufs(), because it assumes 1786 * static metadata. ZFS doesn't preallocate files, so the best 1787 * we can do is report the max that could possibly fit in f_files, 1788 * and that minus the number actually used in f_ffree. 1789 * For f_ffree, report the smaller of the number of object available 1790 * and the number of blocks (each object will take at least a block). 1791 */ 1792 statp->f_ffree = MIN(availobjs, statp->f_bfree); 1793 statp->f_files = statp->f_ffree + usedobjs; 1794 1795 /* 1796 * We're a zfs filesystem. 1797 */ 1798 (void) strlcpy(statp->f_fstypename, "zfs", sizeof(statp->f_fstypename)); 1799 1800 strlcpy(statp->f_mntfromname, vfsp->mnt_stat.f_mntfromname, 1801 sizeof(statp->f_mntfromname)); 1802 strlcpy(statp->f_mntonname, vfsp->mnt_stat.f_mntonname, 1803 sizeof(statp->f_mntonname)); 1804 1805 statp->f_namemax = ZFS_MAXNAMELEN; 1806 1807 ZFS_EXIT(zfsvfs); 1808 return (0); 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(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 = vn_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 rrm_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 rrm_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 rrm_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 rrm_enter(&zfsvfs->z_teardown_lock, RW_WRITER, FTAG); 1986 zfsvfs->z_unmounted = B_TRUE; 1987 rrm_exit(&zfsvfs->z_teardown_lock, FTAG); 1988 } 1989 1990 /* 1991 * Flush all the files. 1992 */ 1993 ret = vflush(vfsp, 0, (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#ifdef sun 2003 if (!(fflag & MS_FORCE)) { 2004 /* 2005 * Check the number of active vnodes in the file system. 2006 * Our count is maintained in the vfs structure, but the 2007 * number is off by 1 to indicate a hold on the vfs 2008 * structure itself. 2009 * 2010 * The '.zfs' directory maintains a reference of its 2011 * own, and any active references underneath are 2012 * reflected in the vnode count. 2013 */ 2014 if (zfsvfs->z_ctldir == NULL) { 2015 if (vfsp->vfs_count > 1) 2016 return (SET_ERROR(EBUSY)); 2017 } else { 2018 if (vfsp->vfs_count > 2 || 2019 zfsvfs->z_ctldir->v_count > 1) 2020 return (SET_ERROR(EBUSY)); 2021 } 2022 } 2023#endif 2024 2025 VERIFY(zfsvfs_teardown(zfsvfs, B_TRUE) == 0); 2026 os = zfsvfs->z_os; 2027 2028 /* 2029 * z_os will be NULL if there was an error in 2030 * attempting to reopen zfsvfs. 2031 */ 2032 if (os != NULL) { 2033 /* 2034 * Unset the objset user_ptr. 2035 */ 2036 mutex_enter(&os->os_user_ptr_lock); 2037 dmu_objset_set_user(os, NULL); 2038 mutex_exit(&os->os_user_ptr_lock); 2039 2040 /* 2041 * Finally release the objset 2042 */ 2043 dmu_objset_disown(os, zfsvfs); 2044 } 2045 2046 /* 2047 * We can now safely destroy the '.zfs' directory node. 2048 */ 2049 if (zfsvfs->z_ctldir != NULL) 2050 zfsctl_destroy(zfsvfs); 2051 if (zfsvfs->z_issnap) { 2052 vnode_t *svp = vfsp->mnt_vnodecovered; 2053 2054 if (svp->v_count >= 2) 2055 VN_RELE(svp); 2056 } 2057 zfs_freevfs(vfsp); 2058 2059 return (0); 2060} 2061 2062static int 2063zfs_vget(vfs_t *vfsp, ino_t ino, int flags, vnode_t **vpp) 2064{ 2065 zfsvfs_t *zfsvfs = vfsp->vfs_data; 2066 znode_t *zp; 2067 int err; 2068 2069 /* 2070 * zfs_zget() can't operate on virtual entries like .zfs/ or 2071 * .zfs/snapshot/ directories, that's why we return EOPNOTSUPP. 2072 * This will make NFS to switch to LOOKUP instead of using VGET. 2073 */ 2074 if (ino == ZFSCTL_INO_ROOT || ino == ZFSCTL_INO_SNAPDIR || 2075 (zfsvfs->z_shares_dir != 0 && ino == zfsvfs->z_shares_dir)) 2076 return (EOPNOTSUPP); 2077 2078 ZFS_ENTER(zfsvfs); 2079 err = zfs_zget(zfsvfs, ino, &zp); 2080 if (err == 0 && zp->z_unlinked) { 2081 VN_RELE(ZTOV(zp)); 2082 err = EINVAL; 2083 } 2084 if (err == 0) 2085 *vpp = ZTOV(zp); 2086 ZFS_EXIT(zfsvfs); 2087 if (err == 0) 2088 err = vn_lock(*vpp, flags); 2089 if (err != 0) 2090 *vpp = NULL; 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 = vn_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 = vn_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. We leave ownership of the underlying 2225 * dataset and objset intact so that they can be atomically handed off during 2226 * a subsequent rollback or recv operation and the resume thereafter. 2227 */ 2228int 2229zfs_suspend_fs(zfsvfs_t *zfsvfs) 2230{ 2231 int error; 2232 2233 if ((error = zfsvfs_teardown(zfsvfs, B_FALSE)) != 0) 2234 return (error); 2235 2236 return (0); 2237} 2238 2239/* 2240 * Rebuild SA and release VOPs. Note that ownership of the underlying dataset 2241 * is an invariant across any of the operations that can be performed while the 2242 * filesystem was suspended. Whether it succeeded or failed, the preconditions 2243 * are the same: the relevant objset and associated dataset are owned by 2244 * zfsvfs, held, and long held on entry. 2245 */ 2246int 2247zfs_resume_fs(zfsvfs_t *zfsvfs, const char *osname) 2248{ 2249 int err; 2250 znode_t *zp; 2251 uint64_t sa_obj = 0; 2252 2253 ASSERT(RRM_WRITE_HELD(&zfsvfs->z_teardown_lock)); 2254 ASSERT(RW_WRITE_HELD(&zfsvfs->z_teardown_inactive_lock)); 2255 2256 /* 2257 * We already own this, so just hold and rele it to update the 2258 * objset_t, as the one we had before may have been evicted. 2259 */ 2260 VERIFY0(dmu_objset_hold(osname, zfsvfs, &zfsvfs->z_os)); 2261 VERIFY3P(zfsvfs->z_os->os_dsl_dataset->ds_owner, ==, zfsvfs); 2262 VERIFY(dsl_dataset_long_held(zfsvfs->z_os->os_dsl_dataset)); 2263 dmu_objset_rele(zfsvfs->z_os, zfsvfs); 2264 2265 /* 2266 * Make sure version hasn't changed 2267 */ 2268 2269 err = zfs_get_zplprop(zfsvfs->z_os, ZFS_PROP_VERSION, 2270 &zfsvfs->z_version); 2271 2272 if (err) 2273 goto bail; 2274 2275 err = zap_lookup(zfsvfs->z_os, MASTER_NODE_OBJ, 2276 ZFS_SA_ATTRS, 8, 1, &sa_obj); 2277 2278 if (err && zfsvfs->z_version >= ZPL_VERSION_SA) 2279 goto bail; 2280 2281 if ((err = sa_setup(zfsvfs->z_os, sa_obj, 2282 zfs_attr_table, ZPL_END, &zfsvfs->z_attr_table)) != 0) 2283 goto bail; 2284 2285 if (zfsvfs->z_version >= ZPL_VERSION_SA) 2286 sa_register_update_callback(zfsvfs->z_os, 2287 zfs_sa_upgrade); 2288 2289 VERIFY(zfsvfs_setup(zfsvfs, B_FALSE) == 0); 2290 2291 zfs_set_fuid_feature(zfsvfs); 2292 2293 /* 2294 * Attempt to re-establish all the active znodes with 2295 * their dbufs. If a zfs_rezget() fails, then we'll let 2296 * any potential callers discover that via ZFS_ENTER_VERIFY_VP 2297 * when they try to use their znode. 2298 */ 2299 mutex_enter(&zfsvfs->z_znodes_lock); 2300 for (zp = list_head(&zfsvfs->z_all_znodes); zp; 2301 zp = list_next(&zfsvfs->z_all_znodes, zp)) { 2302 (void) zfs_rezget(zp); 2303 } 2304 mutex_exit(&zfsvfs->z_znodes_lock); 2305 2306bail: 2307 /* release the VOPs */ 2308 rw_exit(&zfsvfs->z_teardown_inactive_lock); 2309 rrm_exit(&zfsvfs->z_teardown_lock, FTAG); 2310 2311 if (err) { 2312 /* 2313 * Since we couldn't setup the sa framework, try to force 2314 * unmount this file system. 2315 */ 2316 if (vn_vfswlock(zfsvfs->z_vfs->vfs_vnodecovered) == 0) { 2317 vfs_ref(zfsvfs->z_vfs); 2318 (void) dounmount(zfsvfs->z_vfs, MS_FORCE, curthread); 2319 } 2320 } 2321 return (err); 2322} 2323 2324static void 2325zfs_freevfs(vfs_t *vfsp) 2326{ 2327 zfsvfs_t *zfsvfs = vfsp->vfs_data; 2328 2329#ifdef sun 2330 /* 2331 * If this is a snapshot, we have an extra VFS_HOLD on our parent 2332 * from zfs_mount(). Release it here. If we came through 2333 * zfs_mountroot() instead, we didn't grab an extra hold, so 2334 * skip the VFS_RELE for rootvfs. 2335 */ 2336 if (zfsvfs->z_issnap && (vfsp != rootvfs)) 2337 VFS_RELE(zfsvfs->z_parent->z_vfs); 2338#endif /* sun */ 2339 2340 zfsvfs_free(zfsvfs); 2341 2342 atomic_dec_32(&zfs_active_fs_count); 2343} 2344 2345#ifdef __i386__ 2346static int desiredvnodes_backup; 2347#endif 2348 2349static void 2350zfs_vnodes_adjust(void) 2351{ 2352#ifdef __i386__ 2353 int newdesiredvnodes; 2354 2355 desiredvnodes_backup = desiredvnodes; 2356 2357 /* 2358 * We calculate newdesiredvnodes the same way it is done in 2359 * vntblinit(). If it is equal to desiredvnodes, it means that 2360 * it wasn't tuned by the administrator and we can tune it down. 2361 */ 2362 newdesiredvnodes = min(maxproc + cnt.v_page_count / 4, 2 * 2363 vm_kmem_size / (5 * (sizeof(struct vm_object) + 2364 sizeof(struct vnode)))); 2365 if (newdesiredvnodes == desiredvnodes) 2366 desiredvnodes = (3 * newdesiredvnodes) / 4; 2367#endif 2368} 2369 2370static void 2371zfs_vnodes_adjust_back(void) 2372{ 2373 2374#ifdef __i386__ 2375 desiredvnodes = desiredvnodes_backup; 2376#endif 2377} 2378 2379void 2380zfs_init(void) 2381{ 2382 2383 printf("ZFS filesystem version: " ZPL_VERSION_STRING "\n"); 2384 2385 /* 2386 * Initialize .zfs directory structures 2387 */ 2388 zfsctl_init(); 2389 2390 /* 2391 * Initialize znode cache, vnode ops, etc... 2392 */ 2393 zfs_znode_init(); 2394 2395 /* 2396 * Reduce number of vnodes. Originally number of vnodes is calculated 2397 * with UFS inode in mind. We reduce it here, because it's too big for 2398 * ZFS/i386. 2399 */ 2400 zfs_vnodes_adjust(); 2401 2402 dmu_objset_register_type(DMU_OST_ZFS, zfs_space_delta_cb); 2403} 2404 2405void 2406zfs_fini(void) 2407{ 2408 zfsctl_fini(); 2409 zfs_znode_fini(); 2410 zfs_vnodes_adjust_back(); 2411} 2412 2413int 2414zfs_busy(void) 2415{ 2416 return (zfs_active_fs_count != 0); 2417} 2418 2419int 2420zfs_set_version(zfsvfs_t *zfsvfs, uint64_t newvers) 2421{ 2422 int error; 2423 objset_t *os = zfsvfs->z_os; 2424 dmu_tx_t *tx; 2425 2426 if (newvers < ZPL_VERSION_INITIAL || newvers > ZPL_VERSION) 2427 return (SET_ERROR(EINVAL)); 2428 2429 if (newvers < zfsvfs->z_version) 2430 return (SET_ERROR(EINVAL)); 2431 2432 if (zfs_spa_version_map(newvers) > 2433 spa_version(dmu_objset_spa(zfsvfs->z_os))) 2434 return (SET_ERROR(ENOTSUP)); 2435 2436 tx = dmu_tx_create(os); 2437 dmu_tx_hold_zap(tx, MASTER_NODE_OBJ, B_FALSE, ZPL_VERSION_STR); 2438 if (newvers >= ZPL_VERSION_SA && !zfsvfs->z_use_sa) { 2439 dmu_tx_hold_zap(tx, MASTER_NODE_OBJ, B_TRUE, 2440 ZFS_SA_ATTRS); 2441 dmu_tx_hold_zap(tx, DMU_NEW_OBJECT, FALSE, NULL); 2442 } 2443 error = dmu_tx_assign(tx, TXG_WAIT); 2444 if (error) { 2445 dmu_tx_abort(tx); 2446 return (error); 2447 } 2448 2449 error = zap_update(os, MASTER_NODE_OBJ, ZPL_VERSION_STR, 2450 8, 1, &newvers, tx); 2451 2452 if (error) { 2453 dmu_tx_commit(tx); 2454 return (error); 2455 } 2456 2457 if (newvers >= ZPL_VERSION_SA && !zfsvfs->z_use_sa) { 2458 uint64_t sa_obj; 2459 2460 ASSERT3U(spa_version(dmu_objset_spa(zfsvfs->z_os)), >=, 2461 SPA_VERSION_SA); 2462 sa_obj = zap_create(os, DMU_OT_SA_MASTER_NODE, 2463 DMU_OT_NONE, 0, tx); 2464 2465 error = zap_add(os, MASTER_NODE_OBJ, 2466 ZFS_SA_ATTRS, 8, 1, &sa_obj, tx); 2467 ASSERT0(error); 2468 2469 VERIFY(0 == sa_set_sa_object(os, sa_obj)); 2470 sa_register_update_callback(os, zfs_sa_upgrade); 2471 } 2472 2473 spa_history_log_internal_ds(dmu_objset_ds(os), "upgrade", tx, 2474 "from %llu to %llu", zfsvfs->z_version, newvers); 2475 2476 dmu_tx_commit(tx); 2477 2478 zfsvfs->z_version = newvers; 2479 2480 zfs_set_fuid_feature(zfsvfs); 2481 2482 return (0); 2483} 2484 2485/* 2486 * Read a property stored within the master node. 2487 */ 2488int 2489zfs_get_zplprop(objset_t *os, zfs_prop_t prop, uint64_t *value) 2490{ 2491 const char *pname; 2492 int error = ENOENT; 2493 2494 /* 2495 * Look up the file system's value for the property. For the 2496 * version property, we look up a slightly different string. 2497 */ 2498 if (prop == ZFS_PROP_VERSION) 2499 pname = ZPL_VERSION_STR; 2500 else 2501 pname = zfs_prop_to_name(prop); 2502 2503 if (os != NULL) 2504 error = zap_lookup(os, MASTER_NODE_OBJ, pname, 8, 1, value); 2505 2506 if (error == ENOENT) { 2507 /* No value set, use the default value */ 2508 switch (prop) { 2509 case ZFS_PROP_VERSION: 2510 *value = ZPL_VERSION; 2511 break; 2512 case ZFS_PROP_NORMALIZE: 2513 case ZFS_PROP_UTF8ONLY: 2514 *value = 0; 2515 break; 2516 case ZFS_PROP_CASE: 2517 *value = ZFS_CASE_SENSITIVE; 2518 break; 2519 default: 2520 return (error); 2521 } 2522 error = 0; 2523 } 2524 return (error); 2525} 2526 2527#ifdef _KERNEL 2528void 2529zfsvfs_update_fromname(const char *oldname, const char *newname) 2530{ 2531 char tmpbuf[MAXPATHLEN]; 2532 struct mount *mp; 2533 char *fromname; 2534 size_t oldlen; 2535 2536 oldlen = strlen(oldname); 2537 2538 mtx_lock(&mountlist_mtx); 2539 TAILQ_FOREACH(mp, &mountlist, mnt_list) { 2540 fromname = mp->mnt_stat.f_mntfromname; 2541 if (strcmp(fromname, oldname) == 0) { 2542 (void)strlcpy(fromname, newname, 2543 sizeof(mp->mnt_stat.f_mntfromname)); 2544 continue; 2545 } 2546 if (strncmp(fromname, oldname, oldlen) == 0 && 2547 (fromname[oldlen] == '/' || fromname[oldlen] == '@')) { 2548 (void)snprintf(tmpbuf, sizeof(tmpbuf), "%s%s", 2549 newname, fromname + oldlen); 2550 (void)strlcpy(fromname, tmpbuf, 2551 sizeof(mp->mnt_stat.f_mntfromname)); 2552 continue; 2553 } 2554 } 2555 mtx_unlock(&mountlist_mtx); 2556} 2557#endif 2558