zfs_vfsops.c revision 276081
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_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 * nbmand is a special property. It can only be changed at 470 * mount time. 471 * 472 * This is weird, but it is documented to only be changeable 473 * at mount time. 474 */ 475 if (vfs_optionisset(vfsp, MNTOPT_NONBMAND, NULL)) { 476 nbmand = B_FALSE; 477 } else if (vfs_optionisset(vfsp, MNTOPT_NBMAND, NULL)) { 478 nbmand = B_TRUE; 479 } else { 480 char osname[MAXNAMELEN]; 481 482 dmu_objset_name(os, osname); 483 if (error = dsl_prop_get_integer(osname, "nbmand", &nbmand, 484 NULL)) { 485 return (error); 486 } 487 } 488 489 /* 490 * Register property callbacks. 491 * 492 * It would probably be fine to just check for i/o error from 493 * the first prop_register(), but I guess I like to go 494 * overboard... 495 */ 496 ds = dmu_objset_ds(os); 497 dsl_pool_config_enter(dmu_objset_pool(os), FTAG); 498 error = dsl_prop_register(ds, 499 zfs_prop_to_name(ZFS_PROP_ATIME), atime_changed_cb, zfsvfs); 500 error = error ? error : dsl_prop_register(ds, 501 zfs_prop_to_name(ZFS_PROP_XATTR), xattr_changed_cb, zfsvfs); 502 error = error ? error : dsl_prop_register(ds, 503 zfs_prop_to_name(ZFS_PROP_RECORDSIZE), blksz_changed_cb, zfsvfs); 504 error = error ? error : dsl_prop_register(ds, 505 zfs_prop_to_name(ZFS_PROP_READONLY), readonly_changed_cb, zfsvfs); 506#ifdef illumos 507 error = error ? error : dsl_prop_register(ds, 508 zfs_prop_to_name(ZFS_PROP_DEVICES), devices_changed_cb, zfsvfs); 509#endif 510 error = error ? error : dsl_prop_register(ds, 511 zfs_prop_to_name(ZFS_PROP_SETUID), setuid_changed_cb, zfsvfs); 512 error = error ? error : dsl_prop_register(ds, 513 zfs_prop_to_name(ZFS_PROP_EXEC), exec_changed_cb, zfsvfs); 514 error = error ? error : dsl_prop_register(ds, 515 zfs_prop_to_name(ZFS_PROP_SNAPDIR), snapdir_changed_cb, zfsvfs); 516 error = error ? error : dsl_prop_register(ds, 517 zfs_prop_to_name(ZFS_PROP_ACLMODE), acl_mode_changed_cb, zfsvfs); 518 error = error ? error : dsl_prop_register(ds, 519 zfs_prop_to_name(ZFS_PROP_ACLINHERIT), acl_inherit_changed_cb, 520 zfsvfs); 521 error = error ? error : dsl_prop_register(ds, 522 zfs_prop_to_name(ZFS_PROP_VSCAN), vscan_changed_cb, zfsvfs); 523 dsl_pool_config_exit(dmu_objset_pool(os), FTAG); 524 if (error) 525 goto unregister; 526 527 /* 528 * Invoke our callbacks to restore temporary mount options. 529 */ 530 if (do_readonly) 531 readonly_changed_cb(zfsvfs, readonly); 532 if (do_setuid) 533 setuid_changed_cb(zfsvfs, setuid); 534 if (do_exec) 535 exec_changed_cb(zfsvfs, exec); 536 if (do_xattr) 537 xattr_changed_cb(zfsvfs, xattr); 538 if (do_atime) 539 atime_changed_cb(zfsvfs, atime); 540 541 nbmand_changed_cb(zfsvfs, nbmand); 542 543 return (0); 544 545unregister: 546 /* 547 * We may attempt to unregister some callbacks that are not 548 * registered, but this is OK; it will simply return ENOMSG, 549 * which we will ignore. 550 */ 551 (void) dsl_prop_unregister(ds, zfs_prop_to_name(ZFS_PROP_ATIME), 552 atime_changed_cb, zfsvfs); 553 (void) dsl_prop_unregister(ds, zfs_prop_to_name(ZFS_PROP_XATTR), 554 xattr_changed_cb, zfsvfs); 555 (void) dsl_prop_unregister(ds, zfs_prop_to_name(ZFS_PROP_RECORDSIZE), 556 blksz_changed_cb, zfsvfs); 557 (void) dsl_prop_unregister(ds, zfs_prop_to_name(ZFS_PROP_READONLY), 558 readonly_changed_cb, zfsvfs); 559#ifdef illumos 560 (void) dsl_prop_unregister(ds, zfs_prop_to_name(ZFS_PROP_DEVICES), 561 devices_changed_cb, zfsvfs); 562#endif 563 (void) dsl_prop_unregister(ds, zfs_prop_to_name(ZFS_PROP_SETUID), 564 setuid_changed_cb, zfsvfs); 565 (void) dsl_prop_unregister(ds, zfs_prop_to_name(ZFS_PROP_EXEC), 566 exec_changed_cb, zfsvfs); 567 (void) dsl_prop_unregister(ds, zfs_prop_to_name(ZFS_PROP_SNAPDIR), 568 snapdir_changed_cb, zfsvfs); 569 (void) dsl_prop_unregister(ds, zfs_prop_to_name(ZFS_PROP_ACLMODE), 570 acl_mode_changed_cb, zfsvfs); 571 (void) dsl_prop_unregister(ds, zfs_prop_to_name(ZFS_PROP_ACLINHERIT), 572 acl_inherit_changed_cb, zfsvfs); 573 (void) dsl_prop_unregister(ds, zfs_prop_to_name(ZFS_PROP_VSCAN), 574 vscan_changed_cb, zfsvfs); 575 return (error); 576} 577 578static int 579zfs_space_delta_cb(dmu_object_type_t bonustype, void *data, 580 uint64_t *userp, uint64_t *groupp) 581{ 582 /* 583 * Is it a valid type of object to track? 584 */ 585 if (bonustype != DMU_OT_ZNODE && bonustype != DMU_OT_SA) 586 return (SET_ERROR(ENOENT)); 587 588 /* 589 * If we have a NULL data pointer 590 * then assume the id's aren't changing and 591 * return EEXIST to the dmu to let it know to 592 * use the same ids 593 */ 594 if (data == NULL) 595 return (SET_ERROR(EEXIST)); 596 597 if (bonustype == DMU_OT_ZNODE) { 598 znode_phys_t *znp = data; 599 *userp = znp->zp_uid; 600 *groupp = znp->zp_gid; 601 } else { 602 int hdrsize; 603 sa_hdr_phys_t *sap = data; 604 sa_hdr_phys_t sa = *sap; 605 boolean_t swap = B_FALSE; 606 607 ASSERT(bonustype == DMU_OT_SA); 608 609 if (sa.sa_magic == 0) { 610 /* 611 * This should only happen for newly created 612 * files that haven't had the znode data filled 613 * in yet. 614 */ 615 *userp = 0; 616 *groupp = 0; 617 return (0); 618 } 619 if (sa.sa_magic == BSWAP_32(SA_MAGIC)) { 620 sa.sa_magic = SA_MAGIC; 621 sa.sa_layout_info = BSWAP_16(sa.sa_layout_info); 622 swap = B_TRUE; 623 } else { 624 VERIFY3U(sa.sa_magic, ==, SA_MAGIC); 625 } 626 627 hdrsize = sa_hdrsize(&sa); 628 VERIFY3U(hdrsize, >=, sizeof (sa_hdr_phys_t)); 629 *userp = *((uint64_t *)((uintptr_t)data + hdrsize + 630 SA_UID_OFFSET)); 631 *groupp = *((uint64_t *)((uintptr_t)data + hdrsize + 632 SA_GID_OFFSET)); 633 if (swap) { 634 *userp = BSWAP_64(*userp); 635 *groupp = BSWAP_64(*groupp); 636 } 637 } 638 return (0); 639} 640 641static void 642fuidstr_to_sid(zfsvfs_t *zfsvfs, const char *fuidstr, 643 char *domainbuf, int buflen, uid_t *ridp) 644{ 645 uint64_t fuid; 646 const char *domain; 647 648 fuid = strtonum(fuidstr, NULL); 649 650 domain = zfs_fuid_find_by_idx(zfsvfs, FUID_INDEX(fuid)); 651 if (domain) 652 (void) strlcpy(domainbuf, domain, buflen); 653 else 654 domainbuf[0] = '\0'; 655 *ridp = FUID_RID(fuid); 656} 657 658static uint64_t 659zfs_userquota_prop_to_obj(zfsvfs_t *zfsvfs, zfs_userquota_prop_t type) 660{ 661 switch (type) { 662 case ZFS_PROP_USERUSED: 663 return (DMU_USERUSED_OBJECT); 664 case ZFS_PROP_GROUPUSED: 665 return (DMU_GROUPUSED_OBJECT); 666 case ZFS_PROP_USERQUOTA: 667 return (zfsvfs->z_userquota_obj); 668 case ZFS_PROP_GROUPQUOTA: 669 return (zfsvfs->z_groupquota_obj); 670 } 671 return (0); 672} 673 674int 675zfs_userspace_many(zfsvfs_t *zfsvfs, zfs_userquota_prop_t type, 676 uint64_t *cookiep, void *vbuf, uint64_t *bufsizep) 677{ 678 int error; 679 zap_cursor_t zc; 680 zap_attribute_t za; 681 zfs_useracct_t *buf = vbuf; 682 uint64_t obj; 683 684 if (!dmu_objset_userspace_present(zfsvfs->z_os)) 685 return (SET_ERROR(ENOTSUP)); 686 687 obj = zfs_userquota_prop_to_obj(zfsvfs, type); 688 if (obj == 0) { 689 *bufsizep = 0; 690 return (0); 691 } 692 693 for (zap_cursor_init_serialized(&zc, zfsvfs->z_os, obj, *cookiep); 694 (error = zap_cursor_retrieve(&zc, &za)) == 0; 695 zap_cursor_advance(&zc)) { 696 if ((uintptr_t)buf - (uintptr_t)vbuf + sizeof (zfs_useracct_t) > 697 *bufsizep) 698 break; 699 700 fuidstr_to_sid(zfsvfs, za.za_name, 701 buf->zu_domain, sizeof (buf->zu_domain), &buf->zu_rid); 702 703 buf->zu_space = za.za_first_integer; 704 buf++; 705 } 706 if (error == ENOENT) 707 error = 0; 708 709 ASSERT3U((uintptr_t)buf - (uintptr_t)vbuf, <=, *bufsizep); 710 *bufsizep = (uintptr_t)buf - (uintptr_t)vbuf; 711 *cookiep = zap_cursor_serialize(&zc); 712 zap_cursor_fini(&zc); 713 return (error); 714} 715 716/* 717 * buf must be big enough (eg, 32 bytes) 718 */ 719static int 720id_to_fuidstr(zfsvfs_t *zfsvfs, const char *domain, uid_t rid, 721 char *buf, boolean_t addok) 722{ 723 uint64_t fuid; 724 int domainid = 0; 725 726 if (domain && domain[0]) { 727 domainid = zfs_fuid_find_by_domain(zfsvfs, domain, NULL, addok); 728 if (domainid == -1) 729 return (SET_ERROR(ENOENT)); 730 } 731 fuid = FUID_ENCODE(domainid, rid); 732 (void) sprintf(buf, "%llx", (longlong_t)fuid); 733 return (0); 734} 735 736int 737zfs_userspace_one(zfsvfs_t *zfsvfs, zfs_userquota_prop_t type, 738 const char *domain, uint64_t rid, uint64_t *valp) 739{ 740 char buf[32]; 741 int err; 742 uint64_t obj; 743 744 *valp = 0; 745 746 if (!dmu_objset_userspace_present(zfsvfs->z_os)) 747 return (SET_ERROR(ENOTSUP)); 748 749 obj = zfs_userquota_prop_to_obj(zfsvfs, type); 750 if (obj == 0) 751 return (0); 752 753 err = id_to_fuidstr(zfsvfs, domain, rid, buf, B_FALSE); 754 if (err) 755 return (err); 756 757 err = zap_lookup(zfsvfs->z_os, obj, buf, 8, 1, valp); 758 if (err == ENOENT) 759 err = 0; 760 return (err); 761} 762 763int 764zfs_set_userquota(zfsvfs_t *zfsvfs, zfs_userquota_prop_t type, 765 const char *domain, uint64_t rid, uint64_t quota) 766{ 767 char buf[32]; 768 int err; 769 dmu_tx_t *tx; 770 uint64_t *objp; 771 boolean_t fuid_dirtied; 772 773 if (type != ZFS_PROP_USERQUOTA && type != ZFS_PROP_GROUPQUOTA) 774 return (SET_ERROR(EINVAL)); 775 776 if (zfsvfs->z_version < ZPL_VERSION_USERSPACE) 777 return (SET_ERROR(ENOTSUP)); 778 779 objp = (type == ZFS_PROP_USERQUOTA) ? &zfsvfs->z_userquota_obj : 780 &zfsvfs->z_groupquota_obj; 781 782 err = id_to_fuidstr(zfsvfs, domain, rid, buf, B_TRUE); 783 if (err) 784 return (err); 785 fuid_dirtied = zfsvfs->z_fuid_dirty; 786 787 tx = dmu_tx_create(zfsvfs->z_os); 788 dmu_tx_hold_zap(tx, *objp ? *objp : DMU_NEW_OBJECT, B_TRUE, NULL); 789 if (*objp == 0) { 790 dmu_tx_hold_zap(tx, MASTER_NODE_OBJ, B_TRUE, 791 zfs_userquota_prop_prefixes[type]); 792 } 793 if (fuid_dirtied) 794 zfs_fuid_txhold(zfsvfs, tx); 795 err = dmu_tx_assign(tx, TXG_WAIT); 796 if (err) { 797 dmu_tx_abort(tx); 798 return (err); 799 } 800 801 mutex_enter(&zfsvfs->z_lock); 802 if (*objp == 0) { 803 *objp = zap_create(zfsvfs->z_os, DMU_OT_USERGROUP_QUOTA, 804 DMU_OT_NONE, 0, tx); 805 VERIFY(0 == zap_add(zfsvfs->z_os, MASTER_NODE_OBJ, 806 zfs_userquota_prop_prefixes[type], 8, 1, objp, tx)); 807 } 808 mutex_exit(&zfsvfs->z_lock); 809 810 if (quota == 0) { 811 err = zap_remove(zfsvfs->z_os, *objp, buf, tx); 812 if (err == ENOENT) 813 err = 0; 814 } else { 815 err = zap_update(zfsvfs->z_os, *objp, buf, 8, 1, "a, tx); 816 } 817 ASSERT(err == 0); 818 if (fuid_dirtied) 819 zfs_fuid_sync(zfsvfs, tx); 820 dmu_tx_commit(tx); 821 return (err); 822} 823 824boolean_t 825zfs_fuid_overquota(zfsvfs_t *zfsvfs, boolean_t isgroup, uint64_t fuid) 826{ 827 char buf[32]; 828 uint64_t used, quota, usedobj, quotaobj; 829 int err; 830 831 usedobj = isgroup ? DMU_GROUPUSED_OBJECT : DMU_USERUSED_OBJECT; 832 quotaobj = isgroup ? zfsvfs->z_groupquota_obj : zfsvfs->z_userquota_obj; 833 834 if (quotaobj == 0 || zfsvfs->z_replay) 835 return (B_FALSE); 836 837 (void) sprintf(buf, "%llx", (longlong_t)fuid); 838 err = zap_lookup(zfsvfs->z_os, quotaobj, buf, 8, 1, "a); 839 if (err != 0) 840 return (B_FALSE); 841 842 err = zap_lookup(zfsvfs->z_os, usedobj, buf, 8, 1, &used); 843 if (err != 0) 844 return (B_FALSE); 845 return (used >= quota); 846} 847 848boolean_t 849zfs_owner_overquota(zfsvfs_t *zfsvfs, znode_t *zp, boolean_t isgroup) 850{ 851 uint64_t fuid; 852 uint64_t quotaobj; 853 854 quotaobj = isgroup ? zfsvfs->z_groupquota_obj : zfsvfs->z_userquota_obj; 855 856 fuid = isgroup ? zp->z_gid : zp->z_uid; 857 858 if (quotaobj == 0 || zfsvfs->z_replay) 859 return (B_FALSE); 860 861 return (zfs_fuid_overquota(zfsvfs, isgroup, fuid)); 862} 863 864int 865zfsvfs_create(const char *osname, zfsvfs_t **zfvp) 866{ 867 objset_t *os; 868 zfsvfs_t *zfsvfs; 869 uint64_t zval; 870 int i, error; 871 uint64_t sa_obj; 872 873 zfsvfs = kmem_zalloc(sizeof (zfsvfs_t), KM_SLEEP); 874 875 /* 876 * We claim to always be readonly so we can open snapshots; 877 * other ZPL code will prevent us from writing to snapshots. 878 */ 879 error = dmu_objset_own(osname, DMU_OST_ZFS, B_TRUE, zfsvfs, &os); 880 if (error) { 881 kmem_free(zfsvfs, sizeof (zfsvfs_t)); 882 return (error); 883 } 884 885 /* 886 * Initialize the zfs-specific filesystem structure. 887 * Should probably make this a kmem cache, shuffle fields, 888 * and just bzero up to z_hold_mtx[]. 889 */ 890 zfsvfs->z_vfs = NULL; 891 zfsvfs->z_parent = zfsvfs; 892 zfsvfs->z_max_blksz = SPA_OLD_MAXBLOCKSIZE; 893 zfsvfs->z_show_ctldir = ZFS_SNAPDIR_VISIBLE; 894 zfsvfs->z_os = os; 895 896 error = zfs_get_zplprop(os, ZFS_PROP_VERSION, &zfsvfs->z_version); 897 if (error) { 898 goto out; 899 } else if (zfsvfs->z_version > 900 zfs_zpl_version_map(spa_version(dmu_objset_spa(os)))) { 901 (void) printf("Can't mount a version %lld file system " 902 "on a version %lld pool\n. Pool must be upgraded to mount " 903 "this file system.", (u_longlong_t)zfsvfs->z_version, 904 (u_longlong_t)spa_version(dmu_objset_spa(os))); 905 error = SET_ERROR(ENOTSUP); 906 goto out; 907 } 908 if ((error = zfs_get_zplprop(os, ZFS_PROP_NORMALIZE, &zval)) != 0) 909 goto out; 910 zfsvfs->z_norm = (int)zval; 911 912 if ((error = zfs_get_zplprop(os, ZFS_PROP_UTF8ONLY, &zval)) != 0) 913 goto out; 914 zfsvfs->z_utf8 = (zval != 0); 915 916 if ((error = zfs_get_zplprop(os, ZFS_PROP_CASE, &zval)) != 0) 917 goto out; 918 zfsvfs->z_case = (uint_t)zval; 919 920 /* 921 * Fold case on file systems that are always or sometimes case 922 * insensitive. 923 */ 924 if (zfsvfs->z_case == ZFS_CASE_INSENSITIVE || 925 zfsvfs->z_case == ZFS_CASE_MIXED) 926 zfsvfs->z_norm |= U8_TEXTPREP_TOUPPER; 927 928 zfsvfs->z_use_fuids = USE_FUIDS(zfsvfs->z_version, zfsvfs->z_os); 929 zfsvfs->z_use_sa = USE_SA(zfsvfs->z_version, zfsvfs->z_os); 930 931 if (zfsvfs->z_use_sa) { 932 /* should either have both of these objects or none */ 933 error = zap_lookup(os, MASTER_NODE_OBJ, ZFS_SA_ATTRS, 8, 1, 934 &sa_obj); 935 if (error) 936 return (error); 937 } else { 938 /* 939 * Pre SA versions file systems should never touch 940 * either the attribute registration or layout objects. 941 */ 942 sa_obj = 0; 943 } 944 945 error = sa_setup(os, sa_obj, zfs_attr_table, ZPL_END, 946 &zfsvfs->z_attr_table); 947 if (error) 948 goto out; 949 950 if (zfsvfs->z_version >= ZPL_VERSION_SA) 951 sa_register_update_callback(os, zfs_sa_upgrade); 952 953 error = zap_lookup(os, MASTER_NODE_OBJ, ZFS_ROOT_OBJ, 8, 1, 954 &zfsvfs->z_root); 955 if (error) 956 goto out; 957 ASSERT(zfsvfs->z_root != 0); 958 959 error = zap_lookup(os, MASTER_NODE_OBJ, ZFS_UNLINKED_SET, 8, 1, 960 &zfsvfs->z_unlinkedobj); 961 if (error) 962 goto out; 963 964 error = zap_lookup(os, MASTER_NODE_OBJ, 965 zfs_userquota_prop_prefixes[ZFS_PROP_USERQUOTA], 966 8, 1, &zfsvfs->z_userquota_obj); 967 if (error && error != ENOENT) 968 goto out; 969 970 error = zap_lookup(os, MASTER_NODE_OBJ, 971 zfs_userquota_prop_prefixes[ZFS_PROP_GROUPQUOTA], 972 8, 1, &zfsvfs->z_groupquota_obj); 973 if (error && error != ENOENT) 974 goto out; 975 976 error = zap_lookup(os, MASTER_NODE_OBJ, ZFS_FUID_TABLES, 8, 1, 977 &zfsvfs->z_fuid_obj); 978 if (error && error != ENOENT) 979 goto out; 980 981 error = zap_lookup(os, MASTER_NODE_OBJ, ZFS_SHARES_DIR, 8, 1, 982 &zfsvfs->z_shares_dir); 983 if (error && error != ENOENT) 984 goto out; 985 986 mutex_init(&zfsvfs->z_znodes_lock, NULL, MUTEX_DEFAULT, NULL); 987 mutex_init(&zfsvfs->z_lock, NULL, MUTEX_DEFAULT, NULL); 988 list_create(&zfsvfs->z_all_znodes, sizeof (znode_t), 989 offsetof(znode_t, z_link_node)); 990 rrm_init(&zfsvfs->z_teardown_lock, B_FALSE); 991 rw_init(&zfsvfs->z_teardown_inactive_lock, NULL, RW_DEFAULT, NULL); 992 rw_init(&zfsvfs->z_fuid_lock, NULL, RW_DEFAULT, NULL); 993 for (i = 0; i != ZFS_OBJ_MTX_SZ; i++) 994 mutex_init(&zfsvfs->z_hold_mtx[i], NULL, MUTEX_DEFAULT, NULL); 995 996 *zfvp = zfsvfs; 997 return (0); 998 999out: 1000 dmu_objset_disown(os, zfsvfs); 1001 *zfvp = NULL; 1002 kmem_free(zfsvfs, sizeof (zfsvfs_t)); 1003 return (error); 1004} 1005 1006static int 1007zfsvfs_setup(zfsvfs_t *zfsvfs, boolean_t mounting) 1008{ 1009 int error; 1010 1011 error = zfs_register_callbacks(zfsvfs->z_vfs); 1012 if (error) 1013 return (error); 1014 1015 /* 1016 * Set the objset user_ptr to track its zfsvfs. 1017 */ 1018 mutex_enter(&zfsvfs->z_os->os_user_ptr_lock); 1019 dmu_objset_set_user(zfsvfs->z_os, zfsvfs); 1020 mutex_exit(&zfsvfs->z_os->os_user_ptr_lock); 1021 1022 zfsvfs->z_log = zil_open(zfsvfs->z_os, zfs_get_data); 1023 1024 /* 1025 * If we are not mounting (ie: online recv), then we don't 1026 * have to worry about replaying the log as we blocked all 1027 * operations out since we closed the ZIL. 1028 */ 1029 if (mounting) { 1030 boolean_t readonly; 1031 1032 /* 1033 * During replay we remove the read only flag to 1034 * allow replays to succeed. 1035 */ 1036 readonly = zfsvfs->z_vfs->vfs_flag & VFS_RDONLY; 1037 if (readonly != 0) 1038 zfsvfs->z_vfs->vfs_flag &= ~VFS_RDONLY; 1039 else 1040 zfs_unlinked_drain(zfsvfs); 1041 1042 /* 1043 * Parse and replay the intent log. 1044 * 1045 * Because of ziltest, this must be done after 1046 * zfs_unlinked_drain(). (Further note: ziltest 1047 * doesn't use readonly mounts, where 1048 * zfs_unlinked_drain() isn't called.) This is because 1049 * ziltest causes spa_sync() to think it's committed, 1050 * but actually it is not, so the intent log contains 1051 * many txg's worth of changes. 1052 * 1053 * In particular, if object N is in the unlinked set in 1054 * the last txg to actually sync, then it could be 1055 * actually freed in a later txg and then reallocated 1056 * in a yet later txg. This would write a "create 1057 * object N" record to the intent log. Normally, this 1058 * would be fine because the spa_sync() would have 1059 * written out the fact that object N is free, before 1060 * we could write the "create object N" intent log 1061 * record. 1062 * 1063 * But when we are in ziltest mode, we advance the "open 1064 * txg" without actually spa_sync()-ing the changes to 1065 * disk. So we would see that object N is still 1066 * allocated and in the unlinked set, and there is an 1067 * intent log record saying to allocate it. 1068 */ 1069 if (spa_writeable(dmu_objset_spa(zfsvfs->z_os))) { 1070 if (zil_replay_disable) { 1071 zil_destroy(zfsvfs->z_log, B_FALSE); 1072 } else { 1073 zfsvfs->z_replay = B_TRUE; 1074 zil_replay(zfsvfs->z_os, zfsvfs, 1075 zfs_replay_vector); 1076 zfsvfs->z_replay = B_FALSE; 1077 } 1078 } 1079 zfsvfs->z_vfs->vfs_flag |= readonly; /* restore readonly bit */ 1080 } 1081 1082 return (0); 1083} 1084 1085extern krwlock_t zfsvfs_lock; /* in zfs_znode.c */ 1086 1087void 1088zfsvfs_free(zfsvfs_t *zfsvfs) 1089{ 1090 int i; 1091 1092 /* 1093 * This is a barrier to prevent the filesystem from going away in 1094 * zfs_znode_move() until we can safely ensure that the filesystem is 1095 * not unmounted. We consider the filesystem valid before the barrier 1096 * and invalid after the barrier. 1097 */ 1098 rw_enter(&zfsvfs_lock, RW_READER); 1099 rw_exit(&zfsvfs_lock); 1100 1101 zfs_fuid_destroy(zfsvfs); 1102 1103 mutex_destroy(&zfsvfs->z_znodes_lock); 1104 mutex_destroy(&zfsvfs->z_lock); 1105 list_destroy(&zfsvfs->z_all_znodes); 1106 rrm_destroy(&zfsvfs->z_teardown_lock); 1107 rw_destroy(&zfsvfs->z_teardown_inactive_lock); 1108 rw_destroy(&zfsvfs->z_fuid_lock); 1109 for (i = 0; i != ZFS_OBJ_MTX_SZ; i++) 1110 mutex_destroy(&zfsvfs->z_hold_mtx[i]); 1111 kmem_free(zfsvfs, sizeof (zfsvfs_t)); 1112} 1113 1114static void 1115zfs_set_fuid_feature(zfsvfs_t *zfsvfs) 1116{ 1117 zfsvfs->z_use_fuids = USE_FUIDS(zfsvfs->z_version, zfsvfs->z_os); 1118 if (zfsvfs->z_vfs) { 1119 if (zfsvfs->z_use_fuids) { 1120 vfs_set_feature(zfsvfs->z_vfs, VFSFT_XVATTR); 1121 vfs_set_feature(zfsvfs->z_vfs, VFSFT_SYSATTR_VIEWS); 1122 vfs_set_feature(zfsvfs->z_vfs, VFSFT_ACEMASKONACCESS); 1123 vfs_set_feature(zfsvfs->z_vfs, VFSFT_ACLONCREATE); 1124 vfs_set_feature(zfsvfs->z_vfs, VFSFT_ACCESS_FILTER); 1125 vfs_set_feature(zfsvfs->z_vfs, VFSFT_REPARSE); 1126 } else { 1127 vfs_clear_feature(zfsvfs->z_vfs, VFSFT_XVATTR); 1128 vfs_clear_feature(zfsvfs->z_vfs, VFSFT_SYSATTR_VIEWS); 1129 vfs_clear_feature(zfsvfs->z_vfs, VFSFT_ACEMASKONACCESS); 1130 vfs_clear_feature(zfsvfs->z_vfs, VFSFT_ACLONCREATE); 1131 vfs_clear_feature(zfsvfs->z_vfs, VFSFT_ACCESS_FILTER); 1132 vfs_clear_feature(zfsvfs->z_vfs, VFSFT_REPARSE); 1133 } 1134 } 1135 zfsvfs->z_use_sa = USE_SA(zfsvfs->z_version, zfsvfs->z_os); 1136} 1137 1138static int 1139zfs_domount(vfs_t *vfsp, char *osname) 1140{ 1141 uint64_t recordsize, fsid_guid; 1142 int error = 0; 1143 zfsvfs_t *zfsvfs; 1144 vnode_t *vp; 1145 1146 ASSERT(vfsp); 1147 ASSERT(osname); 1148 1149 error = zfsvfs_create(osname, &zfsvfs); 1150 if (error) 1151 return (error); 1152 zfsvfs->z_vfs = vfsp; 1153 1154#ifdef illumos 1155 /* Initialize the generic filesystem structure. */ 1156 vfsp->vfs_bcount = 0; 1157 vfsp->vfs_data = NULL; 1158 1159 if (zfs_create_unique_device(&mount_dev) == -1) { 1160 error = SET_ERROR(ENODEV); 1161 goto out; 1162 } 1163 ASSERT(vfs_devismounted(mount_dev) == 0); 1164#endif 1165 1166 if (error = dsl_prop_get_integer(osname, "recordsize", &recordsize, 1167 NULL)) 1168 goto out; 1169 zfsvfs->z_vfs->vfs_bsize = SPA_MINBLOCKSIZE; 1170 zfsvfs->z_vfs->mnt_stat.f_iosize = recordsize; 1171 1172 vfsp->vfs_data = zfsvfs; 1173 vfsp->mnt_flag |= MNT_LOCAL; 1174 vfsp->mnt_kern_flag |= MNTK_LOOKUP_SHARED; 1175 vfsp->mnt_kern_flag |= MNTK_SHARED_WRITES; 1176 vfsp->mnt_kern_flag |= MNTK_EXTENDED_SHARED; 1177 1178 /* 1179 * The fsid is 64 bits, composed of an 8-bit fs type, which 1180 * separates our fsid from any other filesystem types, and a 1181 * 56-bit objset unique ID. The objset unique ID is unique to 1182 * all objsets open on this system, provided by unique_create(). 1183 * The 8-bit fs type must be put in the low bits of fsid[1] 1184 * because that's where other Solaris filesystems put it. 1185 */ 1186 fsid_guid = dmu_objset_fsid_guid(zfsvfs->z_os); 1187 ASSERT((fsid_guid & ~((1ULL<<56)-1)) == 0); 1188 vfsp->vfs_fsid.val[0] = fsid_guid; 1189 vfsp->vfs_fsid.val[1] = ((fsid_guid>>32) << 8) | 1190 vfsp->mnt_vfc->vfc_typenum & 0xFF; 1191 1192 /* 1193 * Set features for file system. 1194 */ 1195 zfs_set_fuid_feature(zfsvfs); 1196 if (zfsvfs->z_case == ZFS_CASE_INSENSITIVE) { 1197 vfs_set_feature(vfsp, VFSFT_DIRENTFLAGS); 1198 vfs_set_feature(vfsp, VFSFT_CASEINSENSITIVE); 1199 vfs_set_feature(vfsp, VFSFT_NOCASESENSITIVE); 1200 } else if (zfsvfs->z_case == ZFS_CASE_MIXED) { 1201 vfs_set_feature(vfsp, VFSFT_DIRENTFLAGS); 1202 vfs_set_feature(vfsp, VFSFT_CASEINSENSITIVE); 1203 } 1204 vfs_set_feature(vfsp, VFSFT_ZEROCOPY_SUPPORTED); 1205 1206 if (dmu_objset_is_snapshot(zfsvfs->z_os)) { 1207 uint64_t pval; 1208 1209 atime_changed_cb(zfsvfs, B_FALSE); 1210 readonly_changed_cb(zfsvfs, B_TRUE); 1211 if (error = dsl_prop_get_integer(osname, "xattr", &pval, NULL)) 1212 goto out; 1213 xattr_changed_cb(zfsvfs, pval); 1214 zfsvfs->z_issnap = B_TRUE; 1215 zfsvfs->z_os->os_sync = ZFS_SYNC_DISABLED; 1216 1217 mutex_enter(&zfsvfs->z_os->os_user_ptr_lock); 1218 dmu_objset_set_user(zfsvfs->z_os, zfsvfs); 1219 mutex_exit(&zfsvfs->z_os->os_user_ptr_lock); 1220 } else { 1221 error = zfsvfs_setup(zfsvfs, B_TRUE); 1222 } 1223 1224 vfs_mountedfrom(vfsp, osname); 1225 /* Grab extra reference. */ 1226 VERIFY(VFS_ROOT(vfsp, LK_EXCLUSIVE, &vp) == 0); 1227 VOP_UNLOCK(vp, 0); 1228 1229 if (!zfsvfs->z_issnap) 1230 zfsctl_create(zfsvfs); 1231out: 1232 if (error) { 1233 dmu_objset_disown(zfsvfs->z_os, zfsvfs); 1234 zfsvfs_free(zfsvfs); 1235 } else { 1236 atomic_inc_32(&zfs_active_fs_count); 1237 } 1238 1239 return (error); 1240} 1241 1242void 1243zfs_unregister_callbacks(zfsvfs_t *zfsvfs) 1244{ 1245 objset_t *os = zfsvfs->z_os; 1246 struct dsl_dataset *ds; 1247 1248 /* 1249 * Unregister properties. 1250 */ 1251 if (!dmu_objset_is_snapshot(os)) { 1252 ds = dmu_objset_ds(os); 1253 VERIFY(dsl_prop_unregister(ds, "atime", atime_changed_cb, 1254 zfsvfs) == 0); 1255 1256 VERIFY(dsl_prop_unregister(ds, "xattr", xattr_changed_cb, 1257 zfsvfs) == 0); 1258 1259 VERIFY(dsl_prop_unregister(ds, "recordsize", blksz_changed_cb, 1260 zfsvfs) == 0); 1261 1262 VERIFY(dsl_prop_unregister(ds, "readonly", readonly_changed_cb, 1263 zfsvfs) == 0); 1264 1265 VERIFY(dsl_prop_unregister(ds, "setuid", setuid_changed_cb, 1266 zfsvfs) == 0); 1267 1268 VERIFY(dsl_prop_unregister(ds, "exec", exec_changed_cb, 1269 zfsvfs) == 0); 1270 1271 VERIFY(dsl_prop_unregister(ds, "snapdir", snapdir_changed_cb, 1272 zfsvfs) == 0); 1273 1274 VERIFY(dsl_prop_unregister(ds, "aclmode", acl_mode_changed_cb, 1275 zfsvfs) == 0); 1276 1277 VERIFY(dsl_prop_unregister(ds, "aclinherit", 1278 acl_inherit_changed_cb, zfsvfs) == 0); 1279 1280 VERIFY(dsl_prop_unregister(ds, "vscan", 1281 vscan_changed_cb, zfsvfs) == 0); 1282 } 1283} 1284 1285#ifdef SECLABEL 1286/* 1287 * Convert a decimal digit string to a uint64_t integer. 1288 */ 1289static int 1290str_to_uint64(char *str, uint64_t *objnum) 1291{ 1292 uint64_t num = 0; 1293 1294 while (*str) { 1295 if (*str < '0' || *str > '9') 1296 return (SET_ERROR(EINVAL)); 1297 1298 num = num*10 + *str++ - '0'; 1299 } 1300 1301 *objnum = num; 1302 return (0); 1303} 1304 1305/* 1306 * The boot path passed from the boot loader is in the form of 1307 * "rootpool-name/root-filesystem-object-number'. Convert this 1308 * string to a dataset name: "rootpool-name/root-filesystem-name". 1309 */ 1310static int 1311zfs_parse_bootfs(char *bpath, char *outpath) 1312{ 1313 char *slashp; 1314 uint64_t objnum; 1315 int error; 1316 1317 if (*bpath == 0 || *bpath == '/') 1318 return (SET_ERROR(EINVAL)); 1319 1320 (void) strcpy(outpath, bpath); 1321 1322 slashp = strchr(bpath, '/'); 1323 1324 /* if no '/', just return the pool name */ 1325 if (slashp == NULL) { 1326 return (0); 1327 } 1328 1329 /* if not a number, just return the root dataset name */ 1330 if (str_to_uint64(slashp+1, &objnum)) { 1331 return (0); 1332 } 1333 1334 *slashp = '\0'; 1335 error = dsl_dsobj_to_dsname(bpath, objnum, outpath); 1336 *slashp = '/'; 1337 1338 return (error); 1339} 1340 1341/* 1342 * Check that the hex label string is appropriate for the dataset being 1343 * mounted into the global_zone proper. 1344 * 1345 * Return an error if the hex label string is not default or 1346 * admin_low/admin_high. For admin_low labels, the corresponding 1347 * dataset must be readonly. 1348 */ 1349int 1350zfs_check_global_label(const char *dsname, const char *hexsl) 1351{ 1352 if (strcasecmp(hexsl, ZFS_MLSLABEL_DEFAULT) == 0) 1353 return (0); 1354 if (strcasecmp(hexsl, ADMIN_HIGH) == 0) 1355 return (0); 1356 if (strcasecmp(hexsl, ADMIN_LOW) == 0) { 1357 /* must be readonly */ 1358 uint64_t rdonly; 1359 1360 if (dsl_prop_get_integer(dsname, 1361 zfs_prop_to_name(ZFS_PROP_READONLY), &rdonly, NULL)) 1362 return (SET_ERROR(EACCES)); 1363 return (rdonly ? 0 : EACCES); 1364 } 1365 return (SET_ERROR(EACCES)); 1366} 1367 1368/* 1369 * Determine whether the mount is allowed according to MAC check. 1370 * by comparing (where appropriate) label of the dataset against 1371 * the label of the zone being mounted into. If the dataset has 1372 * no label, create one. 1373 * 1374 * Returns 0 if access allowed, error otherwise (e.g. EACCES) 1375 */ 1376static int 1377zfs_mount_label_policy(vfs_t *vfsp, char *osname) 1378{ 1379 int error, retv; 1380 zone_t *mntzone = NULL; 1381 ts_label_t *mnt_tsl; 1382 bslabel_t *mnt_sl; 1383 bslabel_t ds_sl; 1384 char ds_hexsl[MAXNAMELEN]; 1385 1386 retv = EACCES; /* assume the worst */ 1387 1388 /* 1389 * Start by getting the dataset label if it exists. 1390 */ 1391 error = dsl_prop_get(osname, zfs_prop_to_name(ZFS_PROP_MLSLABEL), 1392 1, sizeof (ds_hexsl), &ds_hexsl, NULL); 1393 if (error) 1394 return (SET_ERROR(EACCES)); 1395 1396 /* 1397 * If labeling is NOT enabled, then disallow the mount of datasets 1398 * which have a non-default label already. No other label checks 1399 * are needed. 1400 */ 1401 if (!is_system_labeled()) { 1402 if (strcasecmp(ds_hexsl, ZFS_MLSLABEL_DEFAULT) == 0) 1403 return (0); 1404 return (SET_ERROR(EACCES)); 1405 } 1406 1407 /* 1408 * Get the label of the mountpoint. If mounting into the global 1409 * zone (i.e. mountpoint is not within an active zone and the 1410 * zoned property is off), the label must be default or 1411 * admin_low/admin_high only; no other checks are needed. 1412 */ 1413 mntzone = zone_find_by_any_path(refstr_value(vfsp->vfs_mntpt), B_FALSE); 1414 if (mntzone->zone_id == GLOBAL_ZONEID) { 1415 uint64_t zoned; 1416 1417 zone_rele(mntzone); 1418 1419 if (dsl_prop_get_integer(osname, 1420 zfs_prop_to_name(ZFS_PROP_ZONED), &zoned, NULL)) 1421 return (SET_ERROR(EACCES)); 1422 if (!zoned) 1423 return (zfs_check_global_label(osname, ds_hexsl)); 1424 else 1425 /* 1426 * This is the case of a zone dataset being mounted 1427 * initially, before the zone has been fully created; 1428 * allow this mount into global zone. 1429 */ 1430 return (0); 1431 } 1432 1433 mnt_tsl = mntzone->zone_slabel; 1434 ASSERT(mnt_tsl != NULL); 1435 label_hold(mnt_tsl); 1436 mnt_sl = label2bslabel(mnt_tsl); 1437 1438 if (strcasecmp(ds_hexsl, ZFS_MLSLABEL_DEFAULT) == 0) { 1439 /* 1440 * The dataset doesn't have a real label, so fabricate one. 1441 */ 1442 char *str = NULL; 1443 1444 if (l_to_str_internal(mnt_sl, &str) == 0 && 1445 dsl_prop_set_string(osname, 1446 zfs_prop_to_name(ZFS_PROP_MLSLABEL), 1447 ZPROP_SRC_LOCAL, str) == 0) 1448 retv = 0; 1449 if (str != NULL) 1450 kmem_free(str, strlen(str) + 1); 1451 } else if (hexstr_to_label(ds_hexsl, &ds_sl) == 0) { 1452 /* 1453 * Now compare labels to complete the MAC check. If the 1454 * labels are equal then allow access. If the mountpoint 1455 * label dominates the dataset label, allow readonly access. 1456 * Otherwise, access is denied. 1457 */ 1458 if (blequal(mnt_sl, &ds_sl)) 1459 retv = 0; 1460 else if (bldominates(mnt_sl, &ds_sl)) { 1461 vfs_setmntopt(vfsp, MNTOPT_RO, NULL, 0); 1462 retv = 0; 1463 } 1464 } 1465 1466 label_rele(mnt_tsl); 1467 zone_rele(mntzone); 1468 return (retv); 1469} 1470#endif /* SECLABEL */ 1471 1472#ifdef OPENSOLARIS_MOUNTROOT 1473static int 1474zfs_mountroot(vfs_t *vfsp, enum whymountroot why) 1475{ 1476 int error = 0; 1477 static int zfsrootdone = 0; 1478 zfsvfs_t *zfsvfs = NULL; 1479 znode_t *zp = NULL; 1480 vnode_t *vp = NULL; 1481 char *zfs_bootfs; 1482 char *zfs_devid; 1483 1484 ASSERT(vfsp); 1485 1486 /* 1487 * The filesystem that we mount as root is defined in the 1488 * boot property "zfs-bootfs" with a format of 1489 * "poolname/root-dataset-objnum". 1490 */ 1491 if (why == ROOT_INIT) { 1492 if (zfsrootdone++) 1493 return (SET_ERROR(EBUSY)); 1494 /* 1495 * the process of doing a spa_load will require the 1496 * clock to be set before we could (for example) do 1497 * something better by looking at the timestamp on 1498 * an uberblock, so just set it to -1. 1499 */ 1500 clkset(-1); 1501 1502 if ((zfs_bootfs = spa_get_bootprop("zfs-bootfs")) == NULL) { 1503 cmn_err(CE_NOTE, "spa_get_bootfs: can not get " 1504 "bootfs name"); 1505 return (SET_ERROR(EINVAL)); 1506 } 1507 zfs_devid = spa_get_bootprop("diskdevid"); 1508 error = spa_import_rootpool(rootfs.bo_name, zfs_devid); 1509 if (zfs_devid) 1510 spa_free_bootprop(zfs_devid); 1511 if (error) { 1512 spa_free_bootprop(zfs_bootfs); 1513 cmn_err(CE_NOTE, "spa_import_rootpool: error %d", 1514 error); 1515 return (error); 1516 } 1517 if (error = zfs_parse_bootfs(zfs_bootfs, rootfs.bo_name)) { 1518 spa_free_bootprop(zfs_bootfs); 1519 cmn_err(CE_NOTE, "zfs_parse_bootfs: error %d", 1520 error); 1521 return (error); 1522 } 1523 1524 spa_free_bootprop(zfs_bootfs); 1525 1526 if (error = vfs_lock(vfsp)) 1527 return (error); 1528 1529 if (error = zfs_domount(vfsp, rootfs.bo_name)) { 1530 cmn_err(CE_NOTE, "zfs_domount: error %d", error); 1531 goto out; 1532 } 1533 1534 zfsvfs = (zfsvfs_t *)vfsp->vfs_data; 1535 ASSERT(zfsvfs); 1536 if (error = zfs_zget(zfsvfs, zfsvfs->z_root, &zp)) { 1537 cmn_err(CE_NOTE, "zfs_zget: error %d", error); 1538 goto out; 1539 } 1540 1541 vp = ZTOV(zp); 1542 mutex_enter(&vp->v_lock); 1543 vp->v_flag |= VROOT; 1544 mutex_exit(&vp->v_lock); 1545 rootvp = vp; 1546 1547 /* 1548 * Leave rootvp held. The root file system is never unmounted. 1549 */ 1550 1551 vfs_add((struct vnode *)0, vfsp, 1552 (vfsp->vfs_flag & VFS_RDONLY) ? MS_RDONLY : 0); 1553out: 1554 vfs_unlock(vfsp); 1555 return (error); 1556 } else if (why == ROOT_REMOUNT) { 1557 readonly_changed_cb(vfsp->vfs_data, B_FALSE); 1558 vfsp->vfs_flag |= VFS_REMOUNT; 1559 1560 /* refresh mount options */ 1561 zfs_unregister_callbacks(vfsp->vfs_data); 1562 return (zfs_register_callbacks(vfsp)); 1563 1564 } else if (why == ROOT_UNMOUNT) { 1565 zfs_unregister_callbacks((zfsvfs_t *)vfsp->vfs_data); 1566 (void) zfs_sync(vfsp, 0, 0); 1567 return (0); 1568 } 1569 1570 /* 1571 * if "why" is equal to anything else other than ROOT_INIT, 1572 * ROOT_REMOUNT, or ROOT_UNMOUNT, we do not support it. 1573 */ 1574 return (SET_ERROR(ENOTSUP)); 1575} 1576#endif /* OPENSOLARIS_MOUNTROOT */ 1577 1578static int 1579getpoolname(const char *osname, char *poolname) 1580{ 1581 char *p; 1582 1583 p = strchr(osname, '/'); 1584 if (p == NULL) { 1585 if (strlen(osname) >= MAXNAMELEN) 1586 return (ENAMETOOLONG); 1587 (void) strcpy(poolname, osname); 1588 } else { 1589 if (p - osname >= MAXNAMELEN) 1590 return (ENAMETOOLONG); 1591 (void) strncpy(poolname, osname, p - osname); 1592 poolname[p - osname] = '\0'; 1593 } 1594 return (0); 1595} 1596 1597/*ARGSUSED*/ 1598static int 1599zfs_mount(vfs_t *vfsp) 1600{ 1601 kthread_t *td = curthread; 1602 vnode_t *mvp = vfsp->mnt_vnodecovered; 1603 cred_t *cr = td->td_ucred; 1604 char *osname; 1605 int error = 0; 1606 int canwrite; 1607 1608#ifdef illumos 1609 if (mvp->v_type != VDIR) 1610 return (SET_ERROR(ENOTDIR)); 1611 1612 mutex_enter(&mvp->v_lock); 1613 if ((uap->flags & MS_REMOUNT) == 0 && 1614 (uap->flags & MS_OVERLAY) == 0 && 1615 (mvp->v_count != 1 || (mvp->v_flag & VROOT))) { 1616 mutex_exit(&mvp->v_lock); 1617 return (SET_ERROR(EBUSY)); 1618 } 1619 mutex_exit(&mvp->v_lock); 1620 1621 /* 1622 * ZFS does not support passing unparsed data in via MS_DATA. 1623 * Users should use the MS_OPTIONSTR interface; this means 1624 * that all option parsing is already done and the options struct 1625 * can be interrogated. 1626 */ 1627 if ((uap->flags & MS_DATA) && uap->datalen > 0) 1628#else 1629 if (!prison_allow(td->td_ucred, PR_ALLOW_MOUNT_ZFS)) 1630 return (SET_ERROR(EPERM)); 1631 1632 if (vfs_getopt(vfsp->mnt_optnew, "from", (void **)&osname, NULL)) 1633 return (SET_ERROR(EINVAL)); 1634#endif /* ! illumos */ 1635 1636 /* 1637 * If full-owner-access is enabled and delegated administration is 1638 * turned on, we must set nosuid. 1639 */ 1640 if (zfs_super_owner && 1641 dsl_deleg_access(osname, ZFS_DELEG_PERM_MOUNT, cr) != ECANCELED) { 1642 secpolicy_fs_mount_clearopts(cr, vfsp); 1643 } 1644 1645 /* 1646 * Check for mount privilege? 1647 * 1648 * If we don't have privilege then see if 1649 * we have local permission to allow it 1650 */ 1651 error = secpolicy_fs_mount(cr, mvp, vfsp); 1652 if (error) { 1653 if (dsl_deleg_access(osname, ZFS_DELEG_PERM_MOUNT, cr) != 0) 1654 goto out; 1655 1656 if (!(vfsp->vfs_flag & MS_REMOUNT)) { 1657 vattr_t vattr; 1658 1659 /* 1660 * Make sure user is the owner of the mount point 1661 * or has sufficient privileges. 1662 */ 1663 1664 vattr.va_mask = AT_UID; 1665 1666 vn_lock(mvp, LK_SHARED | LK_RETRY); 1667 if (VOP_GETATTR(mvp, &vattr, cr)) { 1668 VOP_UNLOCK(mvp, 0); 1669 goto out; 1670 } 1671 1672 if (secpolicy_vnode_owner(mvp, cr, vattr.va_uid) != 0 && 1673 VOP_ACCESS(mvp, VWRITE, cr, td) != 0) { 1674 VOP_UNLOCK(mvp, 0); 1675 goto out; 1676 } 1677 VOP_UNLOCK(mvp, 0); 1678 } 1679 1680 secpolicy_fs_mount_clearopts(cr, vfsp); 1681 } 1682 1683 /* 1684 * Refuse to mount a filesystem if we are in a local zone and the 1685 * dataset is not visible. 1686 */ 1687 if (!INGLOBALZONE(curthread) && 1688 (!zone_dataset_visible(osname, &canwrite) || !canwrite)) { 1689 error = SET_ERROR(EPERM); 1690 goto out; 1691 } 1692 1693#ifdef SECLABEL 1694 error = zfs_mount_label_policy(vfsp, osname); 1695 if (error) 1696 goto out; 1697#endif 1698 1699 vfsp->vfs_flag |= MNT_NFS4ACLS; 1700 1701 /* 1702 * When doing a remount, we simply refresh our temporary properties 1703 * according to those options set in the current VFS options. 1704 */ 1705 if (vfsp->vfs_flag & MS_REMOUNT) { 1706 /* refresh mount options */ 1707 zfs_unregister_callbacks(vfsp->vfs_data); 1708 error = zfs_register_callbacks(vfsp); 1709 goto out; 1710 } 1711 1712 /* Initial root mount: try hard to import the requested root pool. */ 1713 if ((vfsp->vfs_flag & MNT_ROOTFS) != 0 && 1714 (vfsp->vfs_flag & MNT_UPDATE) == 0) { 1715 char pname[MAXNAMELEN]; 1716 1717 error = getpoolname(osname, pname); 1718 if (error == 0) 1719 error = spa_import_rootpool(pname); 1720 if (error) 1721 goto out; 1722 } 1723 DROP_GIANT(); 1724 error = zfs_domount(vfsp, osname); 1725 PICKUP_GIANT(); 1726 1727#ifdef sun 1728 /* 1729 * Add an extra VFS_HOLD on our parent vfs so that it can't 1730 * disappear due to a forced unmount. 1731 */ 1732 if (error == 0 && ((zfsvfs_t *)vfsp->vfs_data)->z_issnap) 1733 VFS_HOLD(mvp->v_vfsp); 1734#endif /* sun */ 1735 1736out: 1737 return (error); 1738} 1739 1740static int 1741zfs_statfs(vfs_t *vfsp, struct statfs *statp) 1742{ 1743 zfsvfs_t *zfsvfs = vfsp->vfs_data; 1744 uint64_t refdbytes, availbytes, usedobjs, availobjs; 1745 1746 statp->f_version = STATFS_VERSION; 1747 1748 ZFS_ENTER(zfsvfs); 1749 1750 dmu_objset_space(zfsvfs->z_os, 1751 &refdbytes, &availbytes, &usedobjs, &availobjs); 1752 1753 /* 1754 * The underlying storage pool actually uses multiple block sizes. 1755 * We report the fragsize as the smallest block size we support, 1756 * and we report our blocksize as the filesystem's maximum blocksize. 1757 */ 1758 statp->f_bsize = SPA_MINBLOCKSIZE; 1759 statp->f_iosize = zfsvfs->z_vfs->mnt_stat.f_iosize; 1760 1761 /* 1762 * The following report "total" blocks of various kinds in the 1763 * file system, but reported in terms of f_frsize - the 1764 * "fragment" size. 1765 */ 1766 1767 statp->f_blocks = (refdbytes + availbytes) >> SPA_MINBLOCKSHIFT; 1768 statp->f_bfree = availbytes / statp->f_bsize; 1769 statp->f_bavail = statp->f_bfree; /* no root reservation */ 1770 1771 /* 1772 * statvfs() should really be called statufs(), because it assumes 1773 * static metadata. ZFS doesn't preallocate files, so the best 1774 * we can do is report the max that could possibly fit in f_files, 1775 * and that minus the number actually used in f_ffree. 1776 * For f_ffree, report the smaller of the number of object available 1777 * and the number of blocks (each object will take at least a block). 1778 */ 1779 statp->f_ffree = MIN(availobjs, statp->f_bfree); 1780 statp->f_files = statp->f_ffree + usedobjs; 1781 1782 /* 1783 * We're a zfs filesystem. 1784 */ 1785 (void) strlcpy(statp->f_fstypename, "zfs", sizeof(statp->f_fstypename)); 1786 1787 strlcpy(statp->f_mntfromname, vfsp->mnt_stat.f_mntfromname, 1788 sizeof(statp->f_mntfromname)); 1789 strlcpy(statp->f_mntonname, vfsp->mnt_stat.f_mntonname, 1790 sizeof(statp->f_mntonname)); 1791 1792 statp->f_namemax = ZFS_MAXNAMELEN; 1793 1794 ZFS_EXIT(zfsvfs); 1795 return (0); 1796} 1797 1798static int 1799zfs_root(vfs_t *vfsp, int flags, vnode_t **vpp) 1800{ 1801 zfsvfs_t *zfsvfs = vfsp->vfs_data; 1802 znode_t *rootzp; 1803 int error; 1804 1805 ZFS_ENTER_NOERROR(zfsvfs); 1806 1807 error = zfs_zget(zfsvfs, zfsvfs->z_root, &rootzp); 1808 if (error == 0) 1809 *vpp = ZTOV(rootzp); 1810 1811 ZFS_EXIT(zfsvfs); 1812 1813 if (error == 0) { 1814 error = vn_lock(*vpp, flags); 1815 if (error == 0) 1816 (*vpp)->v_vflag |= VV_ROOT; 1817 } 1818 if (error != 0) 1819 *vpp = NULL; 1820 1821 return (error); 1822} 1823 1824/* 1825 * Teardown the zfsvfs::z_os. 1826 * 1827 * Note, if 'unmounting' if FALSE, we return with the 'z_teardown_lock' 1828 * and 'z_teardown_inactive_lock' held. 1829 */ 1830static int 1831zfsvfs_teardown(zfsvfs_t *zfsvfs, boolean_t unmounting) 1832{ 1833 znode_t *zp; 1834 1835 rrm_enter(&zfsvfs->z_teardown_lock, RW_WRITER, FTAG); 1836 1837 if (!unmounting) { 1838 /* 1839 * We purge the parent filesystem's vfsp as the parent 1840 * filesystem and all of its snapshots have their vnode's 1841 * v_vfsp set to the parent's filesystem's vfsp. Note, 1842 * 'z_parent' is self referential for non-snapshots. 1843 */ 1844 (void) dnlc_purge_vfsp(zfsvfs->z_parent->z_vfs, 0); 1845#ifdef FREEBSD_NAMECACHE 1846 cache_purgevfs(zfsvfs->z_parent->z_vfs); 1847#endif 1848 } 1849 1850 /* 1851 * Close the zil. NB: Can't close the zil while zfs_inactive 1852 * threads are blocked as zil_close can call zfs_inactive. 1853 */ 1854 if (zfsvfs->z_log) { 1855 zil_close(zfsvfs->z_log); 1856 zfsvfs->z_log = NULL; 1857 } 1858 1859 rw_enter(&zfsvfs->z_teardown_inactive_lock, RW_WRITER); 1860 1861 /* 1862 * If we are not unmounting (ie: online recv) and someone already 1863 * unmounted this file system while we were doing the switcheroo, 1864 * or a reopen of z_os failed then just bail out now. 1865 */ 1866 if (!unmounting && (zfsvfs->z_unmounted || zfsvfs->z_os == NULL)) { 1867 rw_exit(&zfsvfs->z_teardown_inactive_lock); 1868 rrm_exit(&zfsvfs->z_teardown_lock, FTAG); 1869 return (SET_ERROR(EIO)); 1870 } 1871 1872 /* 1873 * At this point there are no vops active, and any new vops will 1874 * fail with EIO since we have z_teardown_lock for writer (only 1875 * relavent for forced unmount). 1876 * 1877 * Release all holds on dbufs. 1878 */ 1879 mutex_enter(&zfsvfs->z_znodes_lock); 1880 for (zp = list_head(&zfsvfs->z_all_znodes); zp != NULL; 1881 zp = list_next(&zfsvfs->z_all_znodes, zp)) 1882 if (zp->z_sa_hdl) { 1883 ASSERT(ZTOV(zp)->v_count >= 0); 1884 zfs_znode_dmu_fini(zp); 1885 } 1886 mutex_exit(&zfsvfs->z_znodes_lock); 1887 1888 /* 1889 * If we are unmounting, set the unmounted flag and let new vops 1890 * unblock. zfs_inactive will have the unmounted behavior, and all 1891 * other vops will fail with EIO. 1892 */ 1893 if (unmounting) { 1894 zfsvfs->z_unmounted = B_TRUE; 1895 rrm_exit(&zfsvfs->z_teardown_lock, FTAG); 1896 rw_exit(&zfsvfs->z_teardown_inactive_lock); 1897 } 1898 1899 /* 1900 * z_os will be NULL if there was an error in attempting to reopen 1901 * zfsvfs, so just return as the properties had already been 1902 * unregistered and cached data had been evicted before. 1903 */ 1904 if (zfsvfs->z_os == NULL) 1905 return (0); 1906 1907 /* 1908 * Unregister properties. 1909 */ 1910 zfs_unregister_callbacks(zfsvfs); 1911 1912 /* 1913 * Evict cached data 1914 */ 1915 if (dsl_dataset_is_dirty(dmu_objset_ds(zfsvfs->z_os)) && 1916 !(zfsvfs->z_vfs->vfs_flag & VFS_RDONLY)) 1917 txg_wait_synced(dmu_objset_pool(zfsvfs->z_os), 0); 1918 dmu_objset_evict_dbufs(zfsvfs->z_os); 1919 1920 return (0); 1921} 1922 1923/*ARGSUSED*/ 1924static int 1925zfs_umount(vfs_t *vfsp, int fflag) 1926{ 1927 kthread_t *td = curthread; 1928 zfsvfs_t *zfsvfs = vfsp->vfs_data; 1929 objset_t *os; 1930 cred_t *cr = td->td_ucred; 1931 int ret; 1932 1933 ret = secpolicy_fs_unmount(cr, vfsp); 1934 if (ret) { 1935 if (dsl_deleg_access((char *)refstr_value(vfsp->vfs_resource), 1936 ZFS_DELEG_PERM_MOUNT, cr)) 1937 return (ret); 1938 } 1939 1940 /* 1941 * We purge the parent filesystem's vfsp as the parent filesystem 1942 * and all of its snapshots have their vnode's v_vfsp set to the 1943 * parent's filesystem's vfsp. Note, 'z_parent' is self 1944 * referential for non-snapshots. 1945 */ 1946 (void) dnlc_purge_vfsp(zfsvfs->z_parent->z_vfs, 0); 1947 1948 /* 1949 * Unmount any snapshots mounted under .zfs before unmounting the 1950 * dataset itself. 1951 */ 1952 if (zfsvfs->z_ctldir != NULL) { 1953 if ((ret = zfsctl_umount_snapshots(vfsp, fflag, cr)) != 0) 1954 return (ret); 1955 ret = vflush(vfsp, 0, 0, td); 1956 ASSERT(ret == EBUSY); 1957 if (!(fflag & MS_FORCE)) { 1958 if (zfsvfs->z_ctldir->v_count > 1) 1959 return (EBUSY); 1960 ASSERT(zfsvfs->z_ctldir->v_count == 1); 1961 } 1962 zfsctl_destroy(zfsvfs); 1963 ASSERT(zfsvfs->z_ctldir == NULL); 1964 } 1965 1966 if (fflag & MS_FORCE) { 1967 /* 1968 * Mark file system as unmounted before calling 1969 * vflush(FORCECLOSE). This way we ensure no future vnops 1970 * will be called and risk operating on DOOMED vnodes. 1971 */ 1972 rrm_enter(&zfsvfs->z_teardown_lock, RW_WRITER, FTAG); 1973 zfsvfs->z_unmounted = B_TRUE; 1974 rrm_exit(&zfsvfs->z_teardown_lock, FTAG); 1975 } 1976 1977 /* 1978 * Flush all the files. 1979 */ 1980 ret = vflush(vfsp, 1, (fflag & MS_FORCE) ? FORCECLOSE : 0, td); 1981 if (ret != 0) { 1982 if (!zfsvfs->z_issnap) { 1983 zfsctl_create(zfsvfs); 1984 ASSERT(zfsvfs->z_ctldir != NULL); 1985 } 1986 return (ret); 1987 } 1988 1989#ifdef sun 1990 if (!(fflag & MS_FORCE)) { 1991 /* 1992 * Check the number of active vnodes in the file system. 1993 * Our count is maintained in the vfs structure, but the 1994 * number is off by 1 to indicate a hold on the vfs 1995 * structure itself. 1996 * 1997 * The '.zfs' directory maintains a reference of its 1998 * own, and any active references underneath are 1999 * reflected in the vnode count. 2000 */ 2001 if (zfsvfs->z_ctldir == NULL) { 2002 if (vfsp->vfs_count > 1) 2003 return (SET_ERROR(EBUSY)); 2004 } else { 2005 if (vfsp->vfs_count > 2 || 2006 zfsvfs->z_ctldir->v_count > 1) 2007 return (SET_ERROR(EBUSY)); 2008 } 2009 } 2010#endif 2011 2012 VERIFY(zfsvfs_teardown(zfsvfs, B_TRUE) == 0); 2013 os = zfsvfs->z_os; 2014 2015 /* 2016 * z_os will be NULL if there was an error in 2017 * attempting to reopen zfsvfs. 2018 */ 2019 if (os != NULL) { 2020 /* 2021 * Unset the objset user_ptr. 2022 */ 2023 mutex_enter(&os->os_user_ptr_lock); 2024 dmu_objset_set_user(os, NULL); 2025 mutex_exit(&os->os_user_ptr_lock); 2026 2027 /* 2028 * Finally release the objset 2029 */ 2030 dmu_objset_disown(os, zfsvfs); 2031 } 2032 2033 /* 2034 * We can now safely destroy the '.zfs' directory node. 2035 */ 2036 if (zfsvfs->z_ctldir != NULL) 2037 zfsctl_destroy(zfsvfs); 2038 if (zfsvfs->z_issnap) { 2039 vnode_t *svp = vfsp->mnt_vnodecovered; 2040 2041 if (svp->v_count >= 2) 2042 VN_RELE(svp); 2043 } 2044 zfs_freevfs(vfsp); 2045 2046 return (0); 2047} 2048 2049static int 2050zfs_vget(vfs_t *vfsp, ino_t ino, int flags, vnode_t **vpp) 2051{ 2052 zfsvfs_t *zfsvfs = vfsp->vfs_data; 2053 znode_t *zp; 2054 int err; 2055 2056 /* 2057 * zfs_zget() can't operate on virtual entries like .zfs/ or 2058 * .zfs/snapshot/ directories, that's why we return EOPNOTSUPP. 2059 * This will make NFS to switch to LOOKUP instead of using VGET. 2060 */ 2061 if (ino == ZFSCTL_INO_ROOT || ino == ZFSCTL_INO_SNAPDIR || 2062 (zfsvfs->z_shares_dir != 0 && ino == zfsvfs->z_shares_dir)) 2063 return (EOPNOTSUPP); 2064 2065 ZFS_ENTER(zfsvfs); 2066 err = zfs_zget(zfsvfs, ino, &zp); 2067 if (err == 0 && zp->z_unlinked) { 2068 VN_RELE(ZTOV(zp)); 2069 err = EINVAL; 2070 } 2071 if (err == 0) 2072 *vpp = ZTOV(zp); 2073 ZFS_EXIT(zfsvfs); 2074 if (err == 0) 2075 err = vn_lock(*vpp, flags); 2076 if (err != 0) 2077 *vpp = NULL; 2078 return (err); 2079} 2080 2081static int 2082zfs_checkexp(vfs_t *vfsp, struct sockaddr *nam, int *extflagsp, 2083 struct ucred **credanonp, int *numsecflavors, int **secflavors) 2084{ 2085 zfsvfs_t *zfsvfs = vfsp->vfs_data; 2086 2087 /* 2088 * If this is regular file system vfsp is the same as 2089 * zfsvfs->z_parent->z_vfs, but if it is snapshot, 2090 * zfsvfs->z_parent->z_vfs represents parent file system 2091 * which we have to use here, because only this file system 2092 * has mnt_export configured. 2093 */ 2094 return (vfs_stdcheckexp(zfsvfs->z_parent->z_vfs, nam, extflagsp, 2095 credanonp, numsecflavors, secflavors)); 2096} 2097 2098CTASSERT(SHORT_FID_LEN <= sizeof(struct fid)); 2099CTASSERT(LONG_FID_LEN <= sizeof(struct fid)); 2100 2101static int 2102zfs_fhtovp(vfs_t *vfsp, fid_t *fidp, int flags, vnode_t **vpp) 2103{ 2104 zfsvfs_t *zfsvfs = vfsp->vfs_data; 2105 znode_t *zp; 2106 uint64_t object = 0; 2107 uint64_t fid_gen = 0; 2108 uint64_t gen_mask; 2109 uint64_t zp_gen; 2110 int i, err; 2111 2112 *vpp = NULL; 2113 2114 ZFS_ENTER(zfsvfs); 2115 2116 /* 2117 * On FreeBSD we can get snapshot's mount point or its parent file 2118 * system mount point depending if snapshot is already mounted or not. 2119 */ 2120 if (zfsvfs->z_parent == zfsvfs && fidp->fid_len == LONG_FID_LEN) { 2121 zfid_long_t *zlfid = (zfid_long_t *)fidp; 2122 uint64_t objsetid = 0; 2123 uint64_t setgen = 0; 2124 2125 for (i = 0; i < sizeof (zlfid->zf_setid); i++) 2126 objsetid |= ((uint64_t)zlfid->zf_setid[i]) << (8 * i); 2127 2128 for (i = 0; i < sizeof (zlfid->zf_setgen); i++) 2129 setgen |= ((uint64_t)zlfid->zf_setgen[i]) << (8 * i); 2130 2131 ZFS_EXIT(zfsvfs); 2132 2133 err = zfsctl_lookup_objset(vfsp, objsetid, &zfsvfs); 2134 if (err) 2135 return (SET_ERROR(EINVAL)); 2136 ZFS_ENTER(zfsvfs); 2137 } 2138 2139 if (fidp->fid_len == SHORT_FID_LEN || fidp->fid_len == LONG_FID_LEN) { 2140 zfid_short_t *zfid = (zfid_short_t *)fidp; 2141 2142 for (i = 0; i < sizeof (zfid->zf_object); i++) 2143 object |= ((uint64_t)zfid->zf_object[i]) << (8 * i); 2144 2145 for (i = 0; i < sizeof (zfid->zf_gen); i++) 2146 fid_gen |= ((uint64_t)zfid->zf_gen[i]) << (8 * i); 2147 } else { 2148 ZFS_EXIT(zfsvfs); 2149 return (SET_ERROR(EINVAL)); 2150 } 2151 2152 /* 2153 * A zero fid_gen means we are in .zfs or the .zfs/snapshot 2154 * directory tree. If the object == zfsvfs->z_shares_dir, then 2155 * we are in the .zfs/shares directory tree. 2156 */ 2157 if ((fid_gen == 0 && 2158 (object == ZFSCTL_INO_ROOT || object == ZFSCTL_INO_SNAPDIR)) || 2159 (zfsvfs->z_shares_dir != 0 && object == zfsvfs->z_shares_dir)) { 2160 *vpp = zfsvfs->z_ctldir; 2161 ASSERT(*vpp != NULL); 2162 if (object == ZFSCTL_INO_SNAPDIR) { 2163 VERIFY(zfsctl_root_lookup(*vpp, "snapshot", vpp, NULL, 2164 0, NULL, NULL, NULL, NULL, NULL) == 0); 2165 } else if (object == zfsvfs->z_shares_dir) { 2166 VERIFY(zfsctl_root_lookup(*vpp, "shares", vpp, NULL, 2167 0, NULL, NULL, NULL, NULL, NULL) == 0); 2168 } else { 2169 VN_HOLD(*vpp); 2170 } 2171 ZFS_EXIT(zfsvfs); 2172 err = vn_lock(*vpp, flags); 2173 if (err != 0) 2174 *vpp = NULL; 2175 return (err); 2176 } 2177 2178 gen_mask = -1ULL >> (64 - 8 * i); 2179 2180 dprintf("getting %llu [%u mask %llx]\n", object, fid_gen, gen_mask); 2181 if (err = zfs_zget(zfsvfs, object, &zp)) { 2182 ZFS_EXIT(zfsvfs); 2183 return (err); 2184 } 2185 (void) sa_lookup(zp->z_sa_hdl, SA_ZPL_GEN(zfsvfs), &zp_gen, 2186 sizeof (uint64_t)); 2187 zp_gen = zp_gen & gen_mask; 2188 if (zp_gen == 0) 2189 zp_gen = 1; 2190 if (zp->z_unlinked || zp_gen != fid_gen) { 2191 dprintf("znode gen (%u) != fid gen (%u)\n", zp_gen, fid_gen); 2192 VN_RELE(ZTOV(zp)); 2193 ZFS_EXIT(zfsvfs); 2194 return (SET_ERROR(EINVAL)); 2195 } 2196 2197 *vpp = ZTOV(zp); 2198 ZFS_EXIT(zfsvfs); 2199 err = vn_lock(*vpp, flags | LK_RETRY); 2200 if (err == 0) 2201 vnode_create_vobject(*vpp, zp->z_size, curthread); 2202 else 2203 *vpp = NULL; 2204 return (err); 2205} 2206 2207/* 2208 * Block out VOPs and close zfsvfs_t::z_os 2209 * 2210 * Note, if successful, then we return with the 'z_teardown_lock' and 2211 * 'z_teardown_inactive_lock' write held. We leave ownership of the underlying 2212 * dataset and objset intact so that they can be atomically handed off during 2213 * a subsequent rollback or recv operation and the resume thereafter. 2214 */ 2215int 2216zfs_suspend_fs(zfsvfs_t *zfsvfs) 2217{ 2218 int error; 2219 2220 if ((error = zfsvfs_teardown(zfsvfs, B_FALSE)) != 0) 2221 return (error); 2222 2223 return (0); 2224} 2225 2226/* 2227 * Rebuild SA and release VOPs. Note that ownership of the underlying dataset 2228 * is an invariant across any of the operations that can be performed while the 2229 * filesystem was suspended. Whether it succeeded or failed, the preconditions 2230 * are the same: the relevant objset and associated dataset are owned by 2231 * zfsvfs, held, and long held on entry. 2232 */ 2233int 2234zfs_resume_fs(zfsvfs_t *zfsvfs, const char *osname) 2235{ 2236 int err; 2237 znode_t *zp; 2238 uint64_t sa_obj = 0; 2239 2240 ASSERT(RRM_WRITE_HELD(&zfsvfs->z_teardown_lock)); 2241 ASSERT(RW_WRITE_HELD(&zfsvfs->z_teardown_inactive_lock)); 2242 2243 /* 2244 * We already own this, so just hold and rele it to update the 2245 * objset_t, as the one we had before may have been evicted. 2246 */ 2247 VERIFY0(dmu_objset_hold(osname, zfsvfs, &zfsvfs->z_os)); 2248 VERIFY3P(zfsvfs->z_os->os_dsl_dataset->ds_owner, ==, zfsvfs); 2249 VERIFY(dsl_dataset_long_held(zfsvfs->z_os->os_dsl_dataset)); 2250 dmu_objset_rele(zfsvfs->z_os, zfsvfs); 2251 2252 /* 2253 * Make sure version hasn't changed 2254 */ 2255 2256 err = zfs_get_zplprop(zfsvfs->z_os, ZFS_PROP_VERSION, 2257 &zfsvfs->z_version); 2258 2259 if (err) 2260 goto bail; 2261 2262 err = zap_lookup(zfsvfs->z_os, MASTER_NODE_OBJ, 2263 ZFS_SA_ATTRS, 8, 1, &sa_obj); 2264 2265 if (err && zfsvfs->z_version >= ZPL_VERSION_SA) 2266 goto bail; 2267 2268 if ((err = sa_setup(zfsvfs->z_os, sa_obj, 2269 zfs_attr_table, ZPL_END, &zfsvfs->z_attr_table)) != 0) 2270 goto bail; 2271 2272 if (zfsvfs->z_version >= ZPL_VERSION_SA) 2273 sa_register_update_callback(zfsvfs->z_os, 2274 zfs_sa_upgrade); 2275 2276 VERIFY(zfsvfs_setup(zfsvfs, B_FALSE) == 0); 2277 2278 zfs_set_fuid_feature(zfsvfs); 2279 2280 /* 2281 * Attempt to re-establish all the active znodes with 2282 * their dbufs. If a zfs_rezget() fails, then we'll let 2283 * any potential callers discover that via ZFS_ENTER_VERIFY_VP 2284 * when they try to use their znode. 2285 */ 2286 mutex_enter(&zfsvfs->z_znodes_lock); 2287 for (zp = list_head(&zfsvfs->z_all_znodes); zp; 2288 zp = list_next(&zfsvfs->z_all_znodes, zp)) { 2289 (void) zfs_rezget(zp); 2290 } 2291 mutex_exit(&zfsvfs->z_znodes_lock); 2292 2293bail: 2294 /* release the VOPs */ 2295 rw_exit(&zfsvfs->z_teardown_inactive_lock); 2296 rrm_exit(&zfsvfs->z_teardown_lock, FTAG); 2297 2298 if (err) { 2299 /* 2300 * Since we couldn't setup the sa framework, try to force 2301 * unmount this file system. 2302 */ 2303 if (vn_vfswlock(zfsvfs->z_vfs->vfs_vnodecovered) == 0) 2304 (void) dounmount(zfsvfs->z_vfs, MS_FORCE, curthread); 2305 } 2306 return (err); 2307} 2308 2309static void 2310zfs_freevfs(vfs_t *vfsp) 2311{ 2312 zfsvfs_t *zfsvfs = vfsp->vfs_data; 2313 2314#ifdef sun 2315 /* 2316 * If this is a snapshot, we have an extra VFS_HOLD on our parent 2317 * from zfs_mount(). Release it here. If we came through 2318 * zfs_mountroot() instead, we didn't grab an extra hold, so 2319 * skip the VFS_RELE for rootvfs. 2320 */ 2321 if (zfsvfs->z_issnap && (vfsp != rootvfs)) 2322 VFS_RELE(zfsvfs->z_parent->z_vfs); 2323#endif /* sun */ 2324 2325 zfsvfs_free(zfsvfs); 2326 2327 atomic_dec_32(&zfs_active_fs_count); 2328} 2329 2330#ifdef __i386__ 2331static int desiredvnodes_backup; 2332#endif 2333 2334static void 2335zfs_vnodes_adjust(void) 2336{ 2337#ifdef __i386__ 2338 int newdesiredvnodes; 2339 2340 desiredvnodes_backup = desiredvnodes; 2341 2342 /* 2343 * We calculate newdesiredvnodes the same way it is done in 2344 * vntblinit(). If it is equal to desiredvnodes, it means that 2345 * it wasn't tuned by the administrator and we can tune it down. 2346 */ 2347 newdesiredvnodes = min(maxproc + cnt.v_page_count / 4, 2 * 2348 vm_kmem_size / (5 * (sizeof(struct vm_object) + 2349 sizeof(struct vnode)))); 2350 if (newdesiredvnodes == desiredvnodes) 2351 desiredvnodes = (3 * newdesiredvnodes) / 4; 2352#endif 2353} 2354 2355static void 2356zfs_vnodes_adjust_back(void) 2357{ 2358 2359#ifdef __i386__ 2360 desiredvnodes = desiredvnodes_backup; 2361#endif 2362} 2363 2364void 2365zfs_init(void) 2366{ 2367 2368 printf("ZFS filesystem version: " ZPL_VERSION_STRING "\n"); 2369 2370 /* 2371 * Initialize .zfs directory structures 2372 */ 2373 zfsctl_init(); 2374 2375 /* 2376 * Initialize znode cache, vnode ops, etc... 2377 */ 2378 zfs_znode_init(); 2379 2380 /* 2381 * Reduce number of vnodes. Originally number of vnodes is calculated 2382 * with UFS inode in mind. We reduce it here, because it's too big for 2383 * ZFS/i386. 2384 */ 2385 zfs_vnodes_adjust(); 2386 2387 dmu_objset_register_type(DMU_OST_ZFS, zfs_space_delta_cb); 2388} 2389 2390void 2391zfs_fini(void) 2392{ 2393 zfsctl_fini(); 2394 zfs_znode_fini(); 2395 zfs_vnodes_adjust_back(); 2396} 2397 2398int 2399zfs_busy(void) 2400{ 2401 return (zfs_active_fs_count != 0); 2402} 2403 2404int 2405zfs_set_version(zfsvfs_t *zfsvfs, uint64_t newvers) 2406{ 2407 int error; 2408 objset_t *os = zfsvfs->z_os; 2409 dmu_tx_t *tx; 2410 2411 if (newvers < ZPL_VERSION_INITIAL || newvers > ZPL_VERSION) 2412 return (SET_ERROR(EINVAL)); 2413 2414 if (newvers < zfsvfs->z_version) 2415 return (SET_ERROR(EINVAL)); 2416 2417 if (zfs_spa_version_map(newvers) > 2418 spa_version(dmu_objset_spa(zfsvfs->z_os))) 2419 return (SET_ERROR(ENOTSUP)); 2420 2421 tx = dmu_tx_create(os); 2422 dmu_tx_hold_zap(tx, MASTER_NODE_OBJ, B_FALSE, ZPL_VERSION_STR); 2423 if (newvers >= ZPL_VERSION_SA && !zfsvfs->z_use_sa) { 2424 dmu_tx_hold_zap(tx, MASTER_NODE_OBJ, B_TRUE, 2425 ZFS_SA_ATTRS); 2426 dmu_tx_hold_zap(tx, DMU_NEW_OBJECT, FALSE, NULL); 2427 } 2428 error = dmu_tx_assign(tx, TXG_WAIT); 2429 if (error) { 2430 dmu_tx_abort(tx); 2431 return (error); 2432 } 2433 2434 error = zap_update(os, MASTER_NODE_OBJ, ZPL_VERSION_STR, 2435 8, 1, &newvers, tx); 2436 2437 if (error) { 2438 dmu_tx_commit(tx); 2439 return (error); 2440 } 2441 2442 if (newvers >= ZPL_VERSION_SA && !zfsvfs->z_use_sa) { 2443 uint64_t sa_obj; 2444 2445 ASSERT3U(spa_version(dmu_objset_spa(zfsvfs->z_os)), >=, 2446 SPA_VERSION_SA); 2447 sa_obj = zap_create(os, DMU_OT_SA_MASTER_NODE, 2448 DMU_OT_NONE, 0, tx); 2449 2450 error = zap_add(os, MASTER_NODE_OBJ, 2451 ZFS_SA_ATTRS, 8, 1, &sa_obj, tx); 2452 ASSERT0(error); 2453 2454 VERIFY(0 == sa_set_sa_object(os, sa_obj)); 2455 sa_register_update_callback(os, zfs_sa_upgrade); 2456 } 2457 2458 spa_history_log_internal_ds(dmu_objset_ds(os), "upgrade", tx, 2459 "from %llu to %llu", zfsvfs->z_version, newvers); 2460 2461 dmu_tx_commit(tx); 2462 2463 zfsvfs->z_version = newvers; 2464 2465 zfs_set_fuid_feature(zfsvfs); 2466 2467 return (0); 2468} 2469 2470/* 2471 * Read a property stored within the master node. 2472 */ 2473int 2474zfs_get_zplprop(objset_t *os, zfs_prop_t prop, uint64_t *value) 2475{ 2476 const char *pname; 2477 int error = ENOENT; 2478 2479 /* 2480 * Look up the file system's value for the property. For the 2481 * version property, we look up a slightly different string. 2482 */ 2483 if (prop == ZFS_PROP_VERSION) 2484 pname = ZPL_VERSION_STR; 2485 else 2486 pname = zfs_prop_to_name(prop); 2487 2488 if (os != NULL) 2489 error = zap_lookup(os, MASTER_NODE_OBJ, pname, 8, 1, value); 2490 2491 if (error == ENOENT) { 2492 /* No value set, use the default value */ 2493 switch (prop) { 2494 case ZFS_PROP_VERSION: 2495 *value = ZPL_VERSION; 2496 break; 2497 case ZFS_PROP_NORMALIZE: 2498 case ZFS_PROP_UTF8ONLY: 2499 *value = 0; 2500 break; 2501 case ZFS_PROP_CASE: 2502 *value = ZFS_CASE_SENSITIVE; 2503 break; 2504 default: 2505 return (error); 2506 } 2507 error = 0; 2508 } 2509 return (error); 2510} 2511 2512#ifdef _KERNEL 2513void 2514zfsvfs_update_fromname(const char *oldname, const char *newname) 2515{ 2516 char tmpbuf[MAXPATHLEN]; 2517 struct mount *mp; 2518 char *fromname; 2519 size_t oldlen; 2520 2521 oldlen = strlen(oldname); 2522 2523 mtx_lock(&mountlist_mtx); 2524 TAILQ_FOREACH(mp, &mountlist, mnt_list) { 2525 fromname = mp->mnt_stat.f_mntfromname; 2526 if (strcmp(fromname, oldname) == 0) { 2527 (void)strlcpy(fromname, newname, 2528 sizeof(mp->mnt_stat.f_mntfromname)); 2529 continue; 2530 } 2531 if (strncmp(fromname, oldname, oldlen) == 0 && 2532 (fromname[oldlen] == '/' || fromname[oldlen] == '@')) { 2533 (void)snprintf(tmpbuf, sizeof(tmpbuf), "%s%s", 2534 newname, fromname + oldlen); 2535 (void)strlcpy(fromname, tmpbuf, 2536 sizeof(mp->mnt_stat.f_mntfromname)); 2537 continue; 2538 } 2539 } 2540 mtx_unlock(&mountlist_mtx); 2541} 2542#endif 2543