zfs_vfsops.c revision 197133
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 2008 Sun Microsystems, Inc. All rights reserved. 23 * Use is subject to license terms. 24 */ 25 26#include <sys/types.h> 27#include <sys/param.h> 28#include <sys/systm.h> 29#include <sys/kernel.h> 30#include <sys/sysmacros.h> 31#include <sys/kmem.h> 32#include <sys/acl.h> 33#include <sys/vnode.h> 34#include <sys/vfs.h> 35#include <sys/mntent.h> 36#include <sys/mount.h> 37#include <sys/cmn_err.h> 38#include <sys/zfs_znode.h> 39#include <sys/zfs_dir.h> 40#include <sys/zil.h> 41#include <sys/fs/zfs.h> 42#include <sys/dmu.h> 43#include <sys/dsl_prop.h> 44#include <sys/dsl_dataset.h> 45#include <sys/dsl_deleg.h> 46#include <sys/spa.h> 47#include <sys/zap.h> 48#include <sys/varargs.h> 49#include <sys/policy.h> 50#include <sys/atomic.h> 51#include <sys/zfs_ioctl.h> 52#include <sys/zfs_ctldir.h> 53#include <sys/zfs_fuid.h> 54#include <sys/sunddi.h> 55#include <sys/dnlc.h> 56#include <sys/dmu_objset.h> 57#include <sys/spa_boot.h> 58#include <sys/vdev_impl.h> /* VDEV_BOOT_VERSION */ 59 60struct mtx zfs_debug_mtx; 61MTX_SYSINIT(zfs_debug_mtx, &zfs_debug_mtx, "zfs_debug", MTX_DEF); 62 63SYSCTL_NODE(_vfs, OID_AUTO, zfs, CTLFLAG_RW, 0, "ZFS file system"); 64 65int zfs_super_owner = 0; 66SYSCTL_INT(_vfs_zfs, OID_AUTO, super_owner, CTLFLAG_RW, &zfs_super_owner, 0, 67 "File system owner can perform privileged operation on his file systems"); 68 69int zfs_debug_level = 0; 70TUNABLE_INT("vfs.zfs.debug", &zfs_debug_level); 71SYSCTL_INT(_vfs_zfs, OID_AUTO, debug, CTLFLAG_RW, &zfs_debug_level, 0, 72 "Debug level"); 73 74SYSCTL_NODE(_vfs_zfs, OID_AUTO, version, CTLFLAG_RD, 0, "ZFS versions"); 75static int zfs_version_acl = ZFS_ACL_VERSION; 76SYSCTL_INT(_vfs_zfs_version, OID_AUTO, acl, CTLFLAG_RD, &zfs_version_acl, 0, 77 "ZFS_ACL_VERSION"); 78static int zfs_version_dmu_backup_header = DMU_BACKUP_HEADER_VERSION; 79SYSCTL_INT(_vfs_zfs_version, OID_AUTO, dmu_backup_header, CTLFLAG_RD, 80 &zfs_version_dmu_backup_header, 0, "DMU_BACKUP_HEADER_VERSION"); 81static int zfs_version_dmu_backup_stream = DMU_BACKUP_STREAM_VERSION; 82SYSCTL_INT(_vfs_zfs_version, OID_AUTO, dmu_backup_stream, CTLFLAG_RD, 83 &zfs_version_dmu_backup_stream, 0, "DMU_BACKUP_STREAM_VERSION"); 84static int zfs_version_spa = SPA_VERSION; 85SYSCTL_INT(_vfs_zfs_version, OID_AUTO, spa, CTLFLAG_RD, &zfs_version_spa, 0, 86 "SPA_VERSION"); 87static int zfs_version_vdev_boot = VDEV_BOOT_VERSION; 88SYSCTL_INT(_vfs_zfs_version, OID_AUTO, vdev_boot, CTLFLAG_RD, 89 &zfs_version_vdev_boot, 0, "VDEV_BOOT_VERSION"); 90static int zfs_version_zpl = ZPL_VERSION; 91SYSCTL_INT(_vfs_zfs_version, OID_AUTO, zpl, CTLFLAG_RD, &zfs_version_zpl, 0, 92 "ZPL_VERSION"); 93 94static int zfs_mount(vfs_t *vfsp); 95static int zfs_umount(vfs_t *vfsp, int fflag); 96static int zfs_root(vfs_t *vfsp, int flags, vnode_t **vpp); 97static int zfs_statfs(vfs_t *vfsp, struct statfs *statp); 98static int zfs_vget(vfs_t *vfsp, ino_t ino, int flags, vnode_t **vpp); 99static int zfs_sync(vfs_t *vfsp, int waitfor); 100static int zfs_checkexp(vfs_t *vfsp, struct sockaddr *nam, int *extflagsp, 101 struct ucred **credanonp, int *numsecflavors, int **secflavors); 102static int zfs_fhtovp(vfs_t *vfsp, fid_t *fidp, vnode_t **vpp); 103static void zfs_objset_close(zfsvfs_t *zfsvfs); 104static void zfs_freevfs(vfs_t *vfsp); 105 106static struct vfsops zfs_vfsops = { 107 .vfs_mount = zfs_mount, 108 .vfs_unmount = zfs_umount, 109 .vfs_root = zfs_root, 110 .vfs_statfs = zfs_statfs, 111 .vfs_vget = zfs_vget, 112 .vfs_sync = zfs_sync, 113 .vfs_checkexp = zfs_checkexp, 114 .vfs_fhtovp = zfs_fhtovp, 115}; 116 117VFS_SET(zfs_vfsops, zfs, VFCF_JAIL | VFCF_DELEGADMIN); 118 119/* 120 * We need to keep a count of active fs's. 121 * This is necessary to prevent our module 122 * from being unloaded after a umount -f 123 */ 124static uint32_t zfs_active_fs_count = 0; 125 126/*ARGSUSED*/ 127static int 128zfs_sync(vfs_t *vfsp, int waitfor) 129{ 130 131 /* 132 * Data integrity is job one. We don't want a compromised kernel 133 * writing to the storage pool, so we never sync during panic. 134 */ 135 if (panicstr) 136 return (0); 137 138 if (vfsp != NULL) { 139 /* 140 * Sync a specific filesystem. 141 */ 142 zfsvfs_t *zfsvfs = vfsp->vfs_data; 143 int error; 144 145 error = vfs_stdsync(vfsp, waitfor); 146 if (error != 0) 147 return (error); 148 149 ZFS_ENTER(zfsvfs); 150 if (zfsvfs->z_log != NULL) 151 zil_commit(zfsvfs->z_log, UINT64_MAX, 0); 152 else 153 txg_wait_synced(dmu_objset_pool(zfsvfs->z_os), 0); 154 ZFS_EXIT(zfsvfs); 155 } else { 156 /* 157 * Sync all ZFS filesystems. This is what happens when you 158 * run sync(1M). Unlike other filesystems, ZFS honors the 159 * request by waiting for all pools to commit all dirty data. 160 */ 161 spa_sync_allpools(); 162 } 163 164 return (0); 165} 166 167static void 168atime_changed_cb(void *arg, uint64_t newval) 169{ 170 zfsvfs_t *zfsvfs = arg; 171 172 if (newval == TRUE) { 173 zfsvfs->z_atime = TRUE; 174 zfsvfs->z_vfs->vfs_flag &= ~MNT_NOATIME; 175 vfs_clearmntopt(zfsvfs->z_vfs, MNTOPT_NOATIME); 176 vfs_setmntopt(zfsvfs->z_vfs, MNTOPT_ATIME, NULL, 0); 177 } else { 178 zfsvfs->z_atime = FALSE; 179 zfsvfs->z_vfs->vfs_flag |= MNT_NOATIME; 180 vfs_clearmntopt(zfsvfs->z_vfs, MNTOPT_ATIME); 181 vfs_setmntopt(zfsvfs->z_vfs, MNTOPT_NOATIME, NULL, 0); 182 } 183} 184 185static void 186xattr_changed_cb(void *arg, uint64_t newval) 187{ 188 zfsvfs_t *zfsvfs = arg; 189 190 if (newval == TRUE) { 191 /* XXX locking on vfs_flag? */ 192#ifdef TODO 193 zfsvfs->z_vfs->vfs_flag |= VFS_XATTR; 194#endif 195 vfs_clearmntopt(zfsvfs->z_vfs, MNTOPT_NOXATTR); 196 vfs_setmntopt(zfsvfs->z_vfs, MNTOPT_XATTR, NULL, 0); 197 } else { 198 /* XXX locking on vfs_flag? */ 199#ifdef TODO 200 zfsvfs->z_vfs->vfs_flag &= ~VFS_XATTR; 201#endif 202 vfs_clearmntopt(zfsvfs->z_vfs, MNTOPT_XATTR); 203 vfs_setmntopt(zfsvfs->z_vfs, MNTOPT_NOXATTR, NULL, 0); 204 } 205} 206 207static void 208blksz_changed_cb(void *arg, uint64_t newval) 209{ 210 zfsvfs_t *zfsvfs = arg; 211 212 if (newval < SPA_MINBLOCKSIZE || 213 newval > SPA_MAXBLOCKSIZE || !ISP2(newval)) 214 newval = SPA_MAXBLOCKSIZE; 215 216 zfsvfs->z_max_blksz = newval; 217 zfsvfs->z_vfs->vfs_bsize = newval; 218} 219 220static void 221readonly_changed_cb(void *arg, uint64_t newval) 222{ 223 zfsvfs_t *zfsvfs = arg; 224 225 if (newval) { 226 /* XXX locking on vfs_flag? */ 227 zfsvfs->z_vfs->vfs_flag |= VFS_RDONLY; 228 vfs_clearmntopt(zfsvfs->z_vfs, MNTOPT_RW); 229 vfs_setmntopt(zfsvfs->z_vfs, MNTOPT_RO, NULL, 0); 230 } else { 231 /* XXX locking on vfs_flag? */ 232 zfsvfs->z_vfs->vfs_flag &= ~VFS_RDONLY; 233 vfs_clearmntopt(zfsvfs->z_vfs, MNTOPT_RO); 234 vfs_setmntopt(zfsvfs->z_vfs, MNTOPT_RW, NULL, 0); 235 } 236} 237 238static void 239setuid_changed_cb(void *arg, uint64_t newval) 240{ 241 zfsvfs_t *zfsvfs = arg; 242 243 if (newval == FALSE) { 244 zfsvfs->z_vfs->vfs_flag |= VFS_NOSETUID; 245 vfs_clearmntopt(zfsvfs->z_vfs, MNTOPT_SETUID); 246 vfs_setmntopt(zfsvfs->z_vfs, MNTOPT_NOSETUID, NULL, 0); 247 } else { 248 zfsvfs->z_vfs->vfs_flag &= ~VFS_NOSETUID; 249 vfs_clearmntopt(zfsvfs->z_vfs, MNTOPT_NOSETUID); 250 vfs_setmntopt(zfsvfs->z_vfs, MNTOPT_SETUID, NULL, 0); 251 } 252} 253 254static void 255exec_changed_cb(void *arg, uint64_t newval) 256{ 257 zfsvfs_t *zfsvfs = arg; 258 259 if (newval == FALSE) { 260 zfsvfs->z_vfs->vfs_flag |= VFS_NOEXEC; 261 vfs_clearmntopt(zfsvfs->z_vfs, MNTOPT_EXEC); 262 vfs_setmntopt(zfsvfs->z_vfs, MNTOPT_NOEXEC, NULL, 0); 263 } else { 264 zfsvfs->z_vfs->vfs_flag &= ~VFS_NOEXEC; 265 vfs_clearmntopt(zfsvfs->z_vfs, MNTOPT_NOEXEC); 266 vfs_setmntopt(zfsvfs->z_vfs, MNTOPT_EXEC, NULL, 0); 267 } 268} 269 270/* 271 * The nbmand mount option can be changed at mount time. 272 * We can't allow it to be toggled on live file systems or incorrect 273 * behavior may be seen from cifs clients 274 * 275 * This property isn't registered via dsl_prop_register(), but this callback 276 * will be called when a file system is first mounted 277 */ 278static void 279nbmand_changed_cb(void *arg, uint64_t newval) 280{ 281 zfsvfs_t *zfsvfs = arg; 282 if (newval == FALSE) { 283 vfs_clearmntopt(zfsvfs->z_vfs, MNTOPT_NBMAND); 284 vfs_setmntopt(zfsvfs->z_vfs, MNTOPT_NONBMAND, NULL, 0); 285 } else { 286 vfs_clearmntopt(zfsvfs->z_vfs, MNTOPT_NONBMAND); 287 vfs_setmntopt(zfsvfs->z_vfs, MNTOPT_NBMAND, NULL, 0); 288 } 289} 290 291static void 292snapdir_changed_cb(void *arg, uint64_t newval) 293{ 294 zfsvfs_t *zfsvfs = arg; 295 296 zfsvfs->z_show_ctldir = newval; 297} 298 299static void 300vscan_changed_cb(void *arg, uint64_t newval) 301{ 302 zfsvfs_t *zfsvfs = arg; 303 304 zfsvfs->z_vscan = newval; 305} 306 307static void 308acl_mode_changed_cb(void *arg, uint64_t newval) 309{ 310 zfsvfs_t *zfsvfs = arg; 311 312 zfsvfs->z_acl_mode = newval; 313} 314 315static void 316acl_inherit_changed_cb(void *arg, uint64_t newval) 317{ 318 zfsvfs_t *zfsvfs = arg; 319 320 zfsvfs->z_acl_inherit = newval; 321} 322 323static int 324zfs_register_callbacks(vfs_t *vfsp) 325{ 326 struct dsl_dataset *ds = NULL; 327 objset_t *os = NULL; 328 zfsvfs_t *zfsvfs = NULL; 329 uint64_t nbmand; 330 int readonly, do_readonly = FALSE; 331 int setuid, do_setuid = FALSE; 332 int exec, do_exec = FALSE; 333 int xattr, do_xattr = FALSE; 334 int atime, do_atime = FALSE; 335 int error = 0; 336 337 ASSERT(vfsp); 338 zfsvfs = vfsp->vfs_data; 339 ASSERT(zfsvfs); 340 os = zfsvfs->z_os; 341 342 /* 343 * This function can be called for a snapshot when we update snapshot's 344 * mount point, which isn't really supported. 345 */ 346 if (dmu_objset_is_snapshot(os)) 347 return (EOPNOTSUPP); 348 349 /* 350 * The act of registering our callbacks will destroy any mount 351 * options we may have. In order to enable temporary overrides 352 * of mount options, we stash away the current values and 353 * restore them after we register the callbacks. 354 */ 355 if (vfs_optionisset(vfsp, MNTOPT_RO, NULL)) { 356 readonly = B_TRUE; 357 do_readonly = B_TRUE; 358 } else if (vfs_optionisset(vfsp, MNTOPT_RW, NULL)) { 359 readonly = B_FALSE; 360 do_readonly = B_TRUE; 361 } 362 if (vfs_optionisset(vfsp, MNTOPT_NOSUID, NULL)) { 363 setuid = B_FALSE; 364 do_setuid = B_TRUE; 365 } else { 366 if (vfs_optionisset(vfsp, MNTOPT_NOSETUID, NULL)) { 367 setuid = B_FALSE; 368 do_setuid = B_TRUE; 369 } else if (vfs_optionisset(vfsp, MNTOPT_SETUID, NULL)) { 370 setuid = B_TRUE; 371 do_setuid = B_TRUE; 372 } 373 } 374 if (vfs_optionisset(vfsp, MNTOPT_NOEXEC, NULL)) { 375 exec = B_FALSE; 376 do_exec = B_TRUE; 377 } else if (vfs_optionisset(vfsp, MNTOPT_EXEC, NULL)) { 378 exec = B_TRUE; 379 do_exec = B_TRUE; 380 } 381 if (vfs_optionisset(vfsp, MNTOPT_NOXATTR, NULL)) { 382 xattr = B_FALSE; 383 do_xattr = B_TRUE; 384 } else if (vfs_optionisset(vfsp, MNTOPT_XATTR, NULL)) { 385 xattr = B_TRUE; 386 do_xattr = B_TRUE; 387 } 388 if (vfs_optionisset(vfsp, MNTOPT_NOATIME, NULL)) { 389 atime = B_FALSE; 390 do_atime = B_TRUE; 391 } else if (vfs_optionisset(vfsp, MNTOPT_ATIME, NULL)) { 392 atime = B_TRUE; 393 do_atime = B_TRUE; 394 } 395 396 /* 397 * nbmand is a special property. It can only be changed at 398 * mount time. 399 * 400 * This is weird, but it is documented to only be changeable 401 * at mount time. 402 */ 403 if (vfs_optionisset(vfsp, MNTOPT_NONBMAND, NULL)) { 404 nbmand = B_FALSE; 405 } else if (vfs_optionisset(vfsp, MNTOPT_NBMAND, NULL)) { 406 nbmand = B_TRUE; 407 } else { 408 char osname[MAXNAMELEN]; 409 410 dmu_objset_name(os, osname); 411 if (error = dsl_prop_get_integer(osname, "nbmand", &nbmand, 412 NULL)) { 413 return (error); 414 } 415 } 416 417 /* 418 * Register property callbacks. 419 * 420 * It would probably be fine to just check for i/o error from 421 * the first prop_register(), but I guess I like to go 422 * overboard... 423 */ 424 ds = dmu_objset_ds(os); 425 error = dsl_prop_register(ds, "atime", atime_changed_cb, zfsvfs); 426 error = error ? error : dsl_prop_register(ds, 427 "xattr", xattr_changed_cb, zfsvfs); 428 error = error ? error : dsl_prop_register(ds, 429 "recordsize", blksz_changed_cb, zfsvfs); 430 error = error ? error : dsl_prop_register(ds, 431 "readonly", readonly_changed_cb, zfsvfs); 432 error = error ? error : dsl_prop_register(ds, 433 "setuid", setuid_changed_cb, zfsvfs); 434 error = error ? error : dsl_prop_register(ds, 435 "exec", exec_changed_cb, zfsvfs); 436 error = error ? error : dsl_prop_register(ds, 437 "snapdir", snapdir_changed_cb, zfsvfs); 438 error = error ? error : dsl_prop_register(ds, 439 "aclmode", acl_mode_changed_cb, zfsvfs); 440 error = error ? error : dsl_prop_register(ds, 441 "aclinherit", acl_inherit_changed_cb, zfsvfs); 442 error = error ? error : dsl_prop_register(ds, 443 "vscan", vscan_changed_cb, zfsvfs); 444 if (error) 445 goto unregister; 446 447 /* 448 * Invoke our callbacks to restore temporary mount options. 449 */ 450 if (do_readonly) 451 readonly_changed_cb(zfsvfs, readonly); 452 if (do_setuid) 453 setuid_changed_cb(zfsvfs, setuid); 454 if (do_exec) 455 exec_changed_cb(zfsvfs, exec); 456 if (do_xattr) 457 xattr_changed_cb(zfsvfs, xattr); 458 if (do_atime) 459 atime_changed_cb(zfsvfs, atime); 460 461 nbmand_changed_cb(zfsvfs, nbmand); 462 463 return (0); 464 465unregister: 466 /* 467 * We may attempt to unregister some callbacks that are not 468 * registered, but this is OK; it will simply return ENOMSG, 469 * which we will ignore. 470 */ 471 (void) dsl_prop_unregister(ds, "atime", atime_changed_cb, zfsvfs); 472 (void) dsl_prop_unregister(ds, "xattr", xattr_changed_cb, zfsvfs); 473 (void) dsl_prop_unregister(ds, "recordsize", blksz_changed_cb, zfsvfs); 474 (void) dsl_prop_unregister(ds, "readonly", readonly_changed_cb, zfsvfs); 475 (void) dsl_prop_unregister(ds, "setuid", setuid_changed_cb, zfsvfs); 476 (void) dsl_prop_unregister(ds, "exec", exec_changed_cb, zfsvfs); 477 (void) dsl_prop_unregister(ds, "snapdir", snapdir_changed_cb, zfsvfs); 478 (void) dsl_prop_unregister(ds, "aclmode", acl_mode_changed_cb, zfsvfs); 479 (void) dsl_prop_unregister(ds, "aclinherit", acl_inherit_changed_cb, 480 zfsvfs); 481 (void) dsl_prop_unregister(ds, "vscan", vscan_changed_cb, zfsvfs); 482 return (error); 483 484} 485 486static int 487zfsvfs_setup(zfsvfs_t *zfsvfs, boolean_t mounting) 488{ 489 int error; 490 491 error = zfs_register_callbacks(zfsvfs->z_vfs); 492 if (error) 493 return (error); 494 495 /* 496 * Set the objset user_ptr to track its zfsvfs. 497 */ 498 mutex_enter(&zfsvfs->z_os->os->os_user_ptr_lock); 499 dmu_objset_set_user(zfsvfs->z_os, zfsvfs); 500 mutex_exit(&zfsvfs->z_os->os->os_user_ptr_lock); 501 502 /* 503 * If we are not mounting (ie: online recv), then we don't 504 * have to worry about replaying the log as we blocked all 505 * operations out since we closed the ZIL. 506 */ 507 if (mounting) { 508 boolean_t readonly; 509 510 /* 511 * During replay we remove the read only flag to 512 * allow replays to succeed. 513 */ 514 readonly = zfsvfs->z_vfs->vfs_flag & VFS_RDONLY; 515 zfsvfs->z_vfs->vfs_flag &= ~VFS_RDONLY; 516 517 /* 518 * Parse and replay the intent log. 519 */ 520 zil_replay(zfsvfs->z_os, zfsvfs, &zfsvfs->z_assign, 521 zfs_replay_vector, zfs_unlinked_drain); 522 523 zfs_unlinked_drain(zfsvfs); 524 zfsvfs->z_vfs->vfs_flag |= readonly; /* restore readonly bit */ 525 } 526 527 if (!zil_disable) 528 zfsvfs->z_log = zil_open(zfsvfs->z_os, zfs_get_data); 529 530 return (0); 531} 532 533static void 534zfs_freezfsvfs(zfsvfs_t *zfsvfs) 535{ 536 mutex_destroy(&zfsvfs->z_znodes_lock); 537 mutex_destroy(&zfsvfs->z_online_recv_lock); 538 list_destroy(&zfsvfs->z_all_znodes); 539 rrw_destroy(&zfsvfs->z_teardown_lock); 540 rw_destroy(&zfsvfs->z_teardown_inactive_lock); 541 rw_destroy(&zfsvfs->z_fuid_lock); 542 kmem_free(zfsvfs, sizeof (zfsvfs_t)); 543} 544 545static int 546zfs_domount(vfs_t *vfsp, char *osname) 547{ 548 uint64_t recordsize, readonly; 549 int error = 0; 550 int mode; 551 zfsvfs_t *zfsvfs; 552 znode_t *zp = NULL; 553 554 ASSERT(vfsp); 555 ASSERT(osname); 556 557 /* 558 * Initialize the zfs-specific filesystem structure. 559 * Should probably make this a kmem cache, shuffle fields, 560 * and just bzero up to z_hold_mtx[]. 561 */ 562 zfsvfs = kmem_zalloc(sizeof (zfsvfs_t), KM_SLEEP); 563 zfsvfs->z_vfs = vfsp; 564 zfsvfs->z_parent = zfsvfs; 565 zfsvfs->z_assign = TXG_NOWAIT; 566 zfsvfs->z_max_blksz = SPA_MAXBLOCKSIZE; 567 zfsvfs->z_show_ctldir = ZFS_SNAPDIR_VISIBLE; 568 569 mutex_init(&zfsvfs->z_znodes_lock, NULL, MUTEX_DEFAULT, NULL); 570 mutex_init(&zfsvfs->z_online_recv_lock, NULL, MUTEX_DEFAULT, NULL); 571 list_create(&zfsvfs->z_all_znodes, sizeof (znode_t), 572 offsetof(znode_t, z_link_node)); 573 rrw_init(&zfsvfs->z_teardown_lock); 574 rw_init(&zfsvfs->z_teardown_inactive_lock, NULL, RW_DEFAULT, NULL); 575 rw_init(&zfsvfs->z_fuid_lock, NULL, RW_DEFAULT, NULL); 576 577 if (error = dsl_prop_get_integer(osname, "recordsize", &recordsize, 578 NULL)) 579 goto out; 580 zfsvfs->z_vfs->vfs_bsize = recordsize; 581 582 vfsp->vfs_data = zfsvfs; 583 vfsp->mnt_flag |= MNT_LOCAL; 584 vfsp->mnt_kern_flag |= MNTK_MPSAFE; 585 vfsp->mnt_kern_flag |= MNTK_LOOKUP_SHARED; 586 vfsp->mnt_kern_flag |= MNTK_SHARED_WRITES; 587 588 if (error = dsl_prop_get_integer(osname, "readonly", &readonly, NULL)) 589 goto out; 590 591 mode = DS_MODE_OWNER; 592 if (readonly) 593 mode |= DS_MODE_READONLY; 594 595 error = dmu_objset_open(osname, DMU_OST_ZFS, mode, &zfsvfs->z_os); 596 if (error == EROFS) { 597 mode = DS_MODE_OWNER | DS_MODE_READONLY; 598 error = dmu_objset_open(osname, DMU_OST_ZFS, mode, 599 &zfsvfs->z_os); 600 } 601 602 if (error) 603 goto out; 604 605 if (error = zfs_init_fs(zfsvfs, &zp)) 606 goto out; 607 608 /* 609 * Set features for file system. 610 */ 611 zfsvfs->z_use_fuids = USE_FUIDS(zfsvfs->z_version, zfsvfs->z_os); 612 if (zfsvfs->z_use_fuids) { 613 vfs_set_feature(vfsp, VFSFT_XVATTR); 614 vfs_set_feature(vfsp, VFSFT_SYSATTR_VIEWS); 615 vfs_set_feature(vfsp, VFSFT_ACEMASKONACCESS); 616 vfs_set_feature(vfsp, VFSFT_ACLONCREATE); 617 } 618 if (zfsvfs->z_case == ZFS_CASE_INSENSITIVE) { 619 vfs_set_feature(vfsp, VFSFT_DIRENTFLAGS); 620 vfs_set_feature(vfsp, VFSFT_CASEINSENSITIVE); 621 vfs_set_feature(vfsp, VFSFT_NOCASESENSITIVE); 622 } else if (zfsvfs->z_case == ZFS_CASE_MIXED) { 623 vfs_set_feature(vfsp, VFSFT_DIRENTFLAGS); 624 vfs_set_feature(vfsp, VFSFT_CASEINSENSITIVE); 625 } 626 627 if (dmu_objset_is_snapshot(zfsvfs->z_os)) { 628 uint64_t pval; 629 630 ASSERT(mode & DS_MODE_READONLY); 631 atime_changed_cb(zfsvfs, B_FALSE); 632 readonly_changed_cb(zfsvfs, B_TRUE); 633 if (error = dsl_prop_get_integer(osname, "xattr", &pval, NULL)) 634 goto out; 635 xattr_changed_cb(zfsvfs, pval); 636 zfsvfs->z_issnap = B_TRUE; 637 } else { 638 error = zfsvfs_setup(zfsvfs, B_TRUE); 639 } 640 641 vfs_mountedfrom(vfsp, osname); 642 643 if (!zfsvfs->z_issnap) 644 zfsctl_create(zfsvfs); 645out: 646 if (error) { 647 if (zfsvfs->z_os) 648 dmu_objset_close(zfsvfs->z_os); 649 zfs_freezfsvfs(zfsvfs); 650 } else { 651 atomic_add_32(&zfs_active_fs_count, 1); 652 } 653 654 return (error); 655} 656 657void 658zfs_unregister_callbacks(zfsvfs_t *zfsvfs) 659{ 660 objset_t *os = zfsvfs->z_os; 661 struct dsl_dataset *ds; 662 663 /* 664 * Unregister properties. 665 */ 666 if (!dmu_objset_is_snapshot(os)) { 667 ds = dmu_objset_ds(os); 668 VERIFY(dsl_prop_unregister(ds, "atime", atime_changed_cb, 669 zfsvfs) == 0); 670 671 VERIFY(dsl_prop_unregister(ds, "xattr", xattr_changed_cb, 672 zfsvfs) == 0); 673 674 VERIFY(dsl_prop_unregister(ds, "recordsize", blksz_changed_cb, 675 zfsvfs) == 0); 676 677 VERIFY(dsl_prop_unregister(ds, "readonly", readonly_changed_cb, 678 zfsvfs) == 0); 679 680 VERIFY(dsl_prop_unregister(ds, "setuid", setuid_changed_cb, 681 zfsvfs) == 0); 682 683 VERIFY(dsl_prop_unregister(ds, "exec", exec_changed_cb, 684 zfsvfs) == 0); 685 686 VERIFY(dsl_prop_unregister(ds, "snapdir", snapdir_changed_cb, 687 zfsvfs) == 0); 688 689 VERIFY(dsl_prop_unregister(ds, "aclmode", acl_mode_changed_cb, 690 zfsvfs) == 0); 691 692 VERIFY(dsl_prop_unregister(ds, "aclinherit", 693 acl_inherit_changed_cb, zfsvfs) == 0); 694 695 VERIFY(dsl_prop_unregister(ds, "vscan", 696 vscan_changed_cb, zfsvfs) == 0); 697 } 698} 699 700/*ARGSUSED*/ 701static int 702zfs_mount(vfs_t *vfsp) 703{ 704 kthread_t *td = curthread; 705 vnode_t *mvp = vfsp->mnt_vnodecovered; 706 cred_t *cr = td->td_ucred; 707 char *osname; 708 int error = 0; 709 int canwrite; 710 711 if (vfs_getopt(vfsp->mnt_optnew, "from", (void **)&osname, NULL)) 712 return (EINVAL); 713 714 /* 715 * If full-owner-access is enabled and delegated administration is 716 * turned on, we must set nosuid. 717 */ 718 if (zfs_super_owner && 719 dsl_deleg_access(osname, ZFS_DELEG_PERM_MOUNT, cr) != ECANCELED) { 720 secpolicy_fs_mount_clearopts(cr, vfsp); 721 } 722 723 /* 724 * Check for mount privilege? 725 * 726 * If we don't have privilege then see if 727 * we have local permission to allow it 728 */ 729 error = secpolicy_fs_mount(cr, mvp, vfsp); 730 if (error) { 731 error = dsl_deleg_access(osname, ZFS_DELEG_PERM_MOUNT, cr); 732 if (error != 0) 733 goto out; 734 735 if (!(vfsp->vfs_flag & MS_REMOUNT)) { 736 vattr_t vattr; 737 738 /* 739 * Make sure user is the owner of the mount point 740 * or has sufficient privileges. 741 */ 742 743 vattr.va_mask = AT_UID; 744 745 vn_lock(mvp, LK_SHARED | LK_RETRY); 746 if (error = VOP_GETATTR(mvp, &vattr, cr)) { 747 VOP_UNLOCK(mvp, 0); 748 goto out; 749 } 750 751#if 0 /* CHECK THIS! Is probably needed for zfs_suser. */ 752 if (secpolicy_vnode_owner(mvp, cr, vattr.va_uid) != 0 && 753 VOP_ACCESS(mvp, VWRITE, cr, td) != 0) { 754 error = EPERM; 755 goto out; 756 } 757#else 758 if (error = secpolicy_vnode_owner(mvp, cr, vattr.va_uid)) { 759 VOP_UNLOCK(mvp, 0); 760 goto out; 761 } 762 763 if (error = VOP_ACCESS(mvp, VWRITE, cr, td)) { 764 VOP_UNLOCK(mvp, 0); 765 goto out; 766 } 767 VOP_UNLOCK(mvp, 0); 768#endif 769 } 770 771 secpolicy_fs_mount_clearopts(cr, vfsp); 772 } 773 774 /* 775 * Refuse to mount a filesystem if we are in a local zone and the 776 * dataset is not visible. 777 */ 778 if (!INGLOBALZONE(curthread) && 779 (!zone_dataset_visible(osname, &canwrite) || !canwrite)) { 780 error = EPERM; 781 goto out; 782 } 783 784 /* 785 * When doing a remount, we simply refresh our temporary properties 786 * according to those options set in the current VFS options. 787 */ 788 if (vfsp->vfs_flag & MS_REMOUNT) { 789 /* refresh mount options */ 790 zfs_unregister_callbacks(vfsp->vfs_data); 791 error = zfs_register_callbacks(vfsp); 792 goto out; 793 } 794 795 DROP_GIANT(); 796 error = zfs_domount(vfsp, osname); 797 PICKUP_GIANT(); 798out: 799 return (error); 800} 801 802static int 803zfs_statfs(vfs_t *vfsp, struct statfs *statp) 804{ 805 zfsvfs_t *zfsvfs = vfsp->vfs_data; 806 uint64_t refdbytes, availbytes, usedobjs, availobjs; 807 808 statp->f_version = STATFS_VERSION; 809 810 ZFS_ENTER(zfsvfs); 811 812 dmu_objset_space(zfsvfs->z_os, 813 &refdbytes, &availbytes, &usedobjs, &availobjs); 814 815 /* 816 * The underlying storage pool actually uses multiple block sizes. 817 * We report the fragsize as the smallest block size we support, 818 * and we report our blocksize as the filesystem's maximum blocksize. 819 */ 820 statp->f_bsize = zfsvfs->z_vfs->vfs_bsize; 821 statp->f_iosize = zfsvfs->z_vfs->vfs_bsize; 822 823 /* 824 * The following report "total" blocks of various kinds in the 825 * file system, but reported in terms of f_frsize - the 826 * "fragment" size. 827 */ 828 829 statp->f_blocks = (refdbytes + availbytes) / statp->f_bsize; 830 statp->f_bfree = availbytes / statp->f_bsize; 831 statp->f_bavail = statp->f_bfree; /* no root reservation */ 832 833 /* 834 * statvfs() should really be called statufs(), because it assumes 835 * static metadata. ZFS doesn't preallocate files, so the best 836 * we can do is report the max that could possibly fit in f_files, 837 * and that minus the number actually used in f_ffree. 838 * For f_ffree, report the smaller of the number of object available 839 * and the number of blocks (each object will take at least a block). 840 */ 841 statp->f_ffree = MIN(availobjs, statp->f_bfree); 842 statp->f_files = statp->f_ffree + usedobjs; 843 844 /* 845 * We're a zfs filesystem. 846 */ 847 (void) strlcpy(statp->f_fstypename, "zfs", sizeof(statp->f_fstypename)); 848 849 strlcpy(statp->f_mntfromname, vfsp->mnt_stat.f_mntfromname, 850 sizeof(statp->f_mntfromname)); 851 strlcpy(statp->f_mntonname, vfsp->mnt_stat.f_mntonname, 852 sizeof(statp->f_mntonname)); 853 854 statp->f_namemax = ZFS_MAXNAMELEN; 855 856 ZFS_EXIT(zfsvfs); 857 return (0); 858} 859 860static int 861zfs_root(vfs_t *vfsp, int flags, vnode_t **vpp) 862{ 863 zfsvfs_t *zfsvfs = vfsp->vfs_data; 864 znode_t *rootzp; 865 int error; 866 867 ZFS_ENTER(zfsvfs); 868 869 error = zfs_zget(zfsvfs, zfsvfs->z_root, &rootzp); 870 if (error == 0) { 871 *vpp = ZTOV(rootzp); 872 error = vn_lock(*vpp, flags); 873 (*vpp)->v_vflag |= VV_ROOT; 874 } 875 876 ZFS_EXIT(zfsvfs); 877 return (error); 878} 879 880/* 881 * Teardown the zfsvfs::z_os. 882 * 883 * Note, if 'unmounting' if FALSE, we return with the 'z_teardown_lock' 884 * and 'z_teardown_inactive_lock' held. 885 */ 886static int 887zfsvfs_teardown(zfsvfs_t *zfsvfs, boolean_t unmounting) 888{ 889 znode_t *zp; 890 891 rrw_enter(&zfsvfs->z_teardown_lock, RW_WRITER, FTAG); 892 893 if (!unmounting) { 894 /* 895 * We purge the parent filesystem's vfsp as the parent 896 * filesystem and all of its snapshots have their vnode's 897 * v_vfsp set to the parent's filesystem's vfsp. Note, 898 * 'z_parent' is self referential for non-snapshots. 899 */ 900 (void) dnlc_purge_vfsp(zfsvfs->z_parent->z_vfs, 0); 901 } 902 903 /* 904 * Close the zil. NB: Can't close the zil while zfs_inactive 905 * threads are blocked as zil_close can call zfs_inactive. 906 */ 907 if (zfsvfs->z_log) { 908 zil_close(zfsvfs->z_log); 909 zfsvfs->z_log = NULL; 910 } 911 912 rw_enter(&zfsvfs->z_teardown_inactive_lock, RW_WRITER); 913 914 /* 915 * If we are not unmounting (ie: online recv) and someone already 916 * unmounted this file system while we were doing the switcheroo, 917 * or a reopen of z_os failed then just bail out now. 918 */ 919 if (!unmounting && (zfsvfs->z_unmounted || zfsvfs->z_os == NULL)) { 920 rw_exit(&zfsvfs->z_teardown_inactive_lock); 921 rrw_exit(&zfsvfs->z_teardown_lock, FTAG); 922 return (EIO); 923 } 924 925 /* 926 * At this point there are no vops active, and any new vops will 927 * fail with EIO since we have z_teardown_lock for writer (only 928 * relavent for forced unmount). 929 * 930 * Release all holds on dbufs. 931 */ 932 mutex_enter(&zfsvfs->z_znodes_lock); 933 for (zp = list_head(&zfsvfs->z_all_znodes); zp != NULL; 934 zp = list_next(&zfsvfs->z_all_znodes, zp)) 935 if (zp->z_dbuf) { 936 ASSERT(ZTOV(zp)->v_count >= 0); 937 zfs_znode_dmu_fini(zp); 938 } 939 mutex_exit(&zfsvfs->z_znodes_lock); 940 941 /* 942 * If we are unmounting, set the unmounted flag and let new vops 943 * unblock. zfs_inactive will have the unmounted behavior, and all 944 * other vops will fail with EIO. 945 */ 946 if (unmounting) { 947 zfsvfs->z_unmounted = B_TRUE; 948 rrw_exit(&zfsvfs->z_teardown_lock, FTAG); 949 rw_exit(&zfsvfs->z_teardown_inactive_lock); 950 951#ifdef __FreeBSD__ 952 /* 953 * Some znodes might not be fully reclaimed, wait for them. 954 */ 955 mutex_enter(&zfsvfs->z_znodes_lock); 956 while (list_head(&zfsvfs->z_all_znodes) != NULL) { 957 msleep(zfsvfs, &zfsvfs->z_znodes_lock, 0, 958 "zteardown", 0); 959 } 960 mutex_exit(&zfsvfs->z_znodes_lock); 961#endif 962 } 963 964 /* 965 * z_os will be NULL if there was an error in attempting to reopen 966 * zfsvfs, so just return as the properties had already been 967 * unregistered and cached data had been evicted before. 968 */ 969 if (zfsvfs->z_os == NULL) 970 return (0); 971 972 /* 973 * Unregister properties. 974 */ 975 zfs_unregister_callbacks(zfsvfs); 976 977 /* 978 * Evict cached data 979 */ 980 if (dmu_objset_evict_dbufs(zfsvfs->z_os)) { 981 txg_wait_synced(dmu_objset_pool(zfsvfs->z_os), 0); 982 (void) dmu_objset_evict_dbufs(zfsvfs->z_os); 983 } 984 985 return (0); 986} 987 988/*ARGSUSED*/ 989static int 990zfs_umount(vfs_t *vfsp, int fflag) 991{ 992 zfsvfs_t *zfsvfs = vfsp->vfs_data; 993 objset_t *os; 994 cred_t *cr = curthread->td_ucred; 995 int ret; 996 997 if (fflag & MS_FORCE) { 998 /* TODO: Force unmount is not well implemented yet, so deny it. */ 999 ZFS_LOG(0, "Force unmount is experimental - report any problems."); 1000 } 1001 1002 ret = secpolicy_fs_unmount(cr, vfsp); 1003 if (ret) { 1004 ret = dsl_deleg_access((char *)refstr_value(vfsp->vfs_resource), 1005 ZFS_DELEG_PERM_MOUNT, cr); 1006 if (ret) 1007 return (ret); 1008 } 1009 /* 1010 * We purge the parent filesystem's vfsp as the parent filesystem 1011 * and all of its snapshots have their vnode's v_vfsp set to the 1012 * parent's filesystem's vfsp. Note, 'z_parent' is self 1013 * referential for non-snapshots. 1014 */ 1015 (void) dnlc_purge_vfsp(zfsvfs->z_parent->z_vfs, 0); 1016 1017 /* 1018 * Unmount any snapshots mounted under .zfs before unmounting the 1019 * dataset itself. 1020 */ 1021 if (zfsvfs->z_ctldir != NULL) { 1022 if ((ret = zfsctl_umount_snapshots(vfsp, fflag, cr)) != 0) 1023 return (ret); 1024 ret = vflush(vfsp, 0, 0, curthread); 1025 ASSERT(ret == EBUSY); 1026 if (!(fflag & MS_FORCE)) { 1027 if (zfsvfs->z_ctldir->v_count > 1) 1028 return (EBUSY); 1029 ASSERT(zfsvfs->z_ctldir->v_count == 1); 1030 } 1031 zfsctl_destroy(zfsvfs); 1032 ASSERT(zfsvfs->z_ctldir == NULL); 1033 } 1034 1035 /* 1036 * Flush all the files. 1037 */ 1038 ret = vflush(vfsp, 1, (fflag & MS_FORCE) ? FORCECLOSE : 0, curthread); 1039 if (ret != 0) { 1040 if (!zfsvfs->z_issnap) { 1041 zfsctl_create(zfsvfs); 1042 ASSERT(zfsvfs->z_ctldir != NULL); 1043 } 1044 return (ret); 1045 } 1046 1047 if (!(fflag & MS_FORCE)) { 1048 /* 1049 * Check the number of active vnodes in the file system. 1050 * Our count is maintained in the vfs structure, but the 1051 * number is off by 1 to indicate a hold on the vfs 1052 * structure itself. 1053 * 1054 * The '.zfs' directory maintains a reference of its 1055 * own, and any active references underneath are 1056 * reflected in the vnode count. 1057 */ 1058 if (zfsvfs->z_ctldir == NULL) { 1059 if (vfsp->vfs_count > 1) 1060 return (EBUSY); 1061 } else { 1062 if (vfsp->vfs_count > 2 || 1063 zfsvfs->z_ctldir->v_count > 1) 1064 return (EBUSY); 1065 } 1066 } else { 1067 MNT_ILOCK(vfsp); 1068 vfsp->mnt_kern_flag |= MNTK_UNMOUNTF; 1069 MNT_IUNLOCK(vfsp); 1070 } 1071 1072 VERIFY(zfsvfs_teardown(zfsvfs, B_TRUE) == 0); 1073 os = zfsvfs->z_os; 1074 1075 /* 1076 * z_os will be NULL if there was an error in 1077 * attempting to reopen zfsvfs. 1078 */ 1079 if (os != NULL) { 1080 /* 1081 * Unset the objset user_ptr. 1082 */ 1083 mutex_enter(&os->os->os_user_ptr_lock); 1084 dmu_objset_set_user(os, NULL); 1085 mutex_exit(&os->os->os_user_ptr_lock); 1086 1087 /* 1088 * Finally release the objset 1089 */ 1090 dmu_objset_close(os); 1091 } 1092 1093 /* 1094 * We can now safely destroy the '.zfs' directory node. 1095 */ 1096 if (zfsvfs->z_ctldir != NULL) 1097 zfsctl_destroy(zfsvfs); 1098 if (zfsvfs->z_issnap) { 1099 vnode_t *svp = vfsp->mnt_vnodecovered; 1100 1101 ASSERT(svp->v_count == 2 || svp->v_count == 1); 1102 if (svp->v_count == 2) 1103 VN_RELE(svp); 1104 } 1105 zfs_freevfs(vfsp); 1106 1107 return (0); 1108} 1109 1110static int 1111zfs_vget(vfs_t *vfsp, ino_t ino, int flags, vnode_t **vpp) 1112{ 1113 zfsvfs_t *zfsvfs = vfsp->vfs_data; 1114 znode_t *zp; 1115 int err; 1116 1117 ZFS_ENTER(zfsvfs); 1118 err = zfs_zget(zfsvfs, ino, &zp); 1119 if (err == 0 && zp->z_unlinked) { 1120 VN_RELE(ZTOV(zp)); 1121 err = EINVAL; 1122 } 1123 if (err != 0) 1124 *vpp = NULL; 1125 else { 1126 *vpp = ZTOV(zp); 1127 vn_lock(*vpp, flags); 1128 } 1129 ZFS_EXIT(zfsvfs); 1130 return (err); 1131} 1132 1133static int 1134zfs_checkexp(vfs_t *vfsp, struct sockaddr *nam, int *extflagsp, 1135 struct ucred **credanonp, int *numsecflavors, int **secflavors) 1136{ 1137 zfsvfs_t *zfsvfs = vfsp->vfs_data; 1138 1139 /* 1140 * If this is regular file system vfsp is the same as 1141 * zfsvfs->z_parent->z_vfs, but if it is snapshot, 1142 * zfsvfs->z_parent->z_vfs represents parent file system 1143 * which we have to use here, because only this file system 1144 * has mnt_export configured. 1145 */ 1146 vfsp = zfsvfs->z_parent->z_vfs; 1147 1148 return (vfs_stdcheckexp(zfsvfs->z_parent->z_vfs, nam, extflagsp, 1149 credanonp, numsecflavors, secflavors)); 1150} 1151 1152 1153static int 1154zfs_fhtovp(vfs_t *vfsp, fid_t *fidp, vnode_t **vpp) 1155{ 1156 zfsvfs_t *zfsvfs = vfsp->vfs_data; 1157 znode_t *zp; 1158 uint64_t object = 0; 1159 uint64_t fid_gen = 0; 1160 uint64_t gen_mask; 1161 uint64_t zp_gen; 1162 int i, err; 1163 1164 *vpp = NULL; 1165 1166 ZFS_ENTER(zfsvfs); 1167 1168 /* 1169 * On FreeBSD we are already called with snapshot's mount point 1170 * and not the mount point of its parent. 1171 */ 1172#ifndef __FreeBSD__ 1173 if (fidp->fid_len == LONG_FID_LEN) { 1174 zfid_long_t *zlfid = (zfid_long_t *)fidp; 1175 uint64_t objsetid = 0; 1176 uint64_t setgen = 0; 1177 1178 for (i = 0; i < sizeof (zlfid->zf_setid); i++) 1179 objsetid |= ((uint64_t)zlfid->zf_setid[i]) << (8 * i); 1180 1181 for (i = 0; i < sizeof (zlfid->zf_setgen); i++) 1182 setgen |= ((uint64_t)zlfid->zf_setgen[i]) << (8 * i); 1183 1184 ZFS_EXIT(zfsvfs); 1185 1186 err = zfsctl_lookup_objset(vfsp, objsetid, &zfsvfs); 1187 if (err) 1188 return (EINVAL); 1189 ZFS_ENTER(zfsvfs); 1190 } 1191#endif 1192 1193 if (fidp->fid_len == SHORT_FID_LEN || fidp->fid_len == LONG_FID_LEN) { 1194 zfid_short_t *zfid = (zfid_short_t *)fidp; 1195 1196 for (i = 0; i < sizeof (zfid->zf_object); i++) 1197 object |= ((uint64_t)zfid->zf_object[i]) << (8 * i); 1198 1199 for (i = 0; i < sizeof (zfid->zf_gen); i++) 1200 fid_gen |= ((uint64_t)zfid->zf_gen[i]) << (8 * i); 1201 } else { 1202 ZFS_EXIT(zfsvfs); 1203 return (EINVAL); 1204 } 1205 1206 /* A zero fid_gen means we are in the .zfs control directories */ 1207 if (fid_gen == 0 && 1208 (object == ZFSCTL_INO_ROOT || object == ZFSCTL_INO_SNAPDIR)) { 1209 *vpp = zfsvfs->z_ctldir; 1210 ASSERT(*vpp != NULL); 1211 if (object == ZFSCTL_INO_SNAPDIR) { 1212 VERIFY(zfsctl_root_lookup(*vpp, "snapshot", vpp, NULL, 1213 0, NULL, NULL, NULL, NULL, NULL) == 0); 1214 } else { 1215 VN_HOLD(*vpp); 1216 } 1217 vn_lock(*vpp, LK_EXCLUSIVE | LK_RETRY); 1218 ZFS_EXIT(zfsvfs); 1219 return (0); 1220 } 1221 1222 gen_mask = -1ULL >> (64 - 8 * i); 1223 1224 dprintf("getting %llu [%u mask %llx]\n", object, fid_gen, gen_mask); 1225 if (err = zfs_zget(zfsvfs, object, &zp)) { 1226 ZFS_EXIT(zfsvfs); 1227 return (err); 1228 } 1229 zp_gen = zp->z_phys->zp_gen & gen_mask; 1230 if (zp_gen == 0) 1231 zp_gen = 1; 1232 if (zp->z_unlinked || zp_gen != fid_gen) { 1233 dprintf("znode gen (%u) != fid gen (%u)\n", zp_gen, fid_gen); 1234 VN_RELE(ZTOV(zp)); 1235 ZFS_EXIT(zfsvfs); 1236 return (EINVAL); 1237 } 1238 1239 *vpp = ZTOV(zp); 1240 vn_lock(*vpp, LK_EXCLUSIVE | LK_RETRY); 1241 vnode_create_vobject(*vpp, zp->z_phys->zp_size, curthread); 1242 ZFS_EXIT(zfsvfs); 1243 return (0); 1244} 1245 1246/* 1247 * Block out VOPs and close zfsvfs_t::z_os 1248 * 1249 * Note, if successful, then we return with the 'z_teardown_lock' and 1250 * 'z_teardown_inactive_lock' write held. 1251 */ 1252int 1253zfs_suspend_fs(zfsvfs_t *zfsvfs, char *name, int *mode) 1254{ 1255 int error; 1256 1257 if ((error = zfsvfs_teardown(zfsvfs, B_FALSE)) != 0) 1258 return (error); 1259 1260 *mode = zfsvfs->z_os->os_mode; 1261 dmu_objset_name(zfsvfs->z_os, name); 1262 dmu_objset_close(zfsvfs->z_os); 1263 1264 return (0); 1265} 1266 1267/* 1268 * Reopen zfsvfs_t::z_os and release VOPs. 1269 */ 1270int 1271zfs_resume_fs(zfsvfs_t *zfsvfs, const char *osname, int mode) 1272{ 1273 int err; 1274 1275 ASSERT(RRW_WRITE_HELD(&zfsvfs->z_teardown_lock)); 1276 ASSERT(RW_WRITE_HELD(&zfsvfs->z_teardown_inactive_lock)); 1277 1278 err = dmu_objset_open(osname, DMU_OST_ZFS, mode, &zfsvfs->z_os); 1279 if (err) { 1280 zfsvfs->z_os = NULL; 1281 } else { 1282 znode_t *zp; 1283 1284 VERIFY(zfsvfs_setup(zfsvfs, B_FALSE) == 0); 1285 1286 /* 1287 * Attempt to re-establish all the active znodes with 1288 * their dbufs. If a zfs_rezget() fails, then we'll let 1289 * any potential callers discover that via ZFS_ENTER_VERIFY_VP 1290 * when they try to use their znode. 1291 */ 1292 mutex_enter(&zfsvfs->z_znodes_lock); 1293 for (zp = list_head(&zfsvfs->z_all_znodes); zp; 1294 zp = list_next(&zfsvfs->z_all_znodes, zp)) { 1295 (void) zfs_rezget(zp); 1296 } 1297 mutex_exit(&zfsvfs->z_znodes_lock); 1298 1299 } 1300 1301 /* release the VOPs */ 1302 rw_exit(&zfsvfs->z_teardown_inactive_lock); 1303 rrw_exit(&zfsvfs->z_teardown_lock, FTAG); 1304 1305 if (err) { 1306 /* 1307 * Since we couldn't reopen zfsvfs::z_os, force 1308 * unmount this file system. 1309 */ 1310 if (vn_vfswlock(zfsvfs->z_vfs->vfs_vnodecovered) == 0) 1311 (void) dounmount(zfsvfs->z_vfs, MS_FORCE, curthread); 1312 } 1313 return (err); 1314} 1315 1316static void 1317zfs_freevfs(vfs_t *vfsp) 1318{ 1319 zfsvfs_t *zfsvfs = vfsp->vfs_data; 1320 int i; 1321 1322 for (i = 0; i != ZFS_OBJ_MTX_SZ; i++) 1323 mutex_destroy(&zfsvfs->z_hold_mtx[i]); 1324 1325 zfs_fuid_destroy(zfsvfs); 1326 zfs_freezfsvfs(zfsvfs); 1327 1328 atomic_add_32(&zfs_active_fs_count, -1); 1329} 1330 1331#ifdef __i386__ 1332static int desiredvnodes_backup; 1333#endif 1334 1335static void 1336zfs_vnodes_adjust(void) 1337{ 1338#ifdef __i386__ 1339 int newdesiredvnodes; 1340 1341 desiredvnodes_backup = desiredvnodes; 1342 1343 /* 1344 * We calculate newdesiredvnodes the same way it is done in 1345 * vntblinit(). If it is equal to desiredvnodes, it means that 1346 * it wasn't tuned by the administrator and we can tune it down. 1347 */ 1348 newdesiredvnodes = min(maxproc + cnt.v_page_count / 4, 2 * 1349 vm_kmem_size / (5 * (sizeof(struct vm_object) + 1350 sizeof(struct vnode)))); 1351 if (newdesiredvnodes == desiredvnodes) 1352 desiredvnodes = (3 * newdesiredvnodes) / 4; 1353#endif 1354} 1355 1356static void 1357zfs_vnodes_adjust_back(void) 1358{ 1359 1360#ifdef __i386__ 1361 desiredvnodes = desiredvnodes_backup; 1362#endif 1363} 1364 1365void 1366zfs_init(void) 1367{ 1368 1369 printf("ZFS filesystem version " SPA_VERSION_STRING "\n"); 1370 1371 /* 1372 * Initialize znode cache, vnode ops, etc... 1373 */ 1374 zfs_znode_init(); 1375 1376 /* 1377 * Initialize .zfs directory structures 1378 */ 1379 zfsctl_init(); 1380 1381 /* 1382 * Reduce number of vnode. Originally number of vnodes is calculated 1383 * with UFS inode in mind. We reduce it here, because it's too big for 1384 * ZFS/i386. 1385 */ 1386 zfs_vnodes_adjust(); 1387} 1388 1389void 1390zfs_fini(void) 1391{ 1392 zfsctl_fini(); 1393 zfs_znode_fini(); 1394 zfs_vnodes_adjust_back(); 1395} 1396 1397int 1398zfs_busy(void) 1399{ 1400 return (zfs_active_fs_count != 0); 1401} 1402 1403int 1404zfs_set_version(const char *name, uint64_t newvers) 1405{ 1406 int error; 1407 objset_t *os; 1408 dmu_tx_t *tx; 1409 uint64_t curvers; 1410 1411 /* 1412 * XXX for now, require that the filesystem be unmounted. Would 1413 * be nice to find the zfsvfs_t and just update that if 1414 * possible. 1415 */ 1416 1417 if (newvers < ZPL_VERSION_INITIAL || newvers > ZPL_VERSION) 1418 return (EINVAL); 1419 1420 error = dmu_objset_open(name, DMU_OST_ZFS, DS_MODE_OWNER, &os); 1421 if (error) 1422 return (error); 1423 1424 error = zap_lookup(os, MASTER_NODE_OBJ, ZPL_VERSION_STR, 1425 8, 1, &curvers); 1426 if (error) 1427 goto out; 1428 if (newvers < curvers) { 1429 error = EINVAL; 1430 goto out; 1431 } 1432 1433 tx = dmu_tx_create(os); 1434 dmu_tx_hold_zap(tx, MASTER_NODE_OBJ, 0, ZPL_VERSION_STR); 1435 error = dmu_tx_assign(tx, TXG_WAIT); 1436 if (error) { 1437 dmu_tx_abort(tx); 1438 goto out; 1439 } 1440 error = zap_update(os, MASTER_NODE_OBJ, ZPL_VERSION_STR, 8, 1, 1441 &newvers, tx); 1442 1443 spa_history_internal_log(LOG_DS_UPGRADE, 1444 dmu_objset_spa(os), tx, CRED(), 1445 "oldver=%llu newver=%llu dataset = %llu", curvers, newvers, 1446 dmu_objset_id(os)); 1447 dmu_tx_commit(tx); 1448 1449out: 1450 dmu_objset_close(os); 1451 return (error); 1452} 1453/* 1454 * Read a property stored within the master node. 1455 */ 1456int 1457zfs_get_zplprop(objset_t *os, zfs_prop_t prop, uint64_t *value) 1458{ 1459 const char *pname; 1460 int error = ENOENT; 1461 1462 /* 1463 * Look up the file system's value for the property. For the 1464 * version property, we look up a slightly different string. 1465 */ 1466 if (prop == ZFS_PROP_VERSION) 1467 pname = ZPL_VERSION_STR; 1468 else 1469 pname = zfs_prop_to_name(prop); 1470 1471 if (os != NULL) 1472 error = zap_lookup(os, MASTER_NODE_OBJ, pname, 8, 1, value); 1473 1474 if (error == ENOENT) { 1475 /* No value set, use the default value */ 1476 switch (prop) { 1477 case ZFS_PROP_VERSION: 1478 *value = ZPL_VERSION; 1479 break; 1480 case ZFS_PROP_NORMALIZE: 1481 case ZFS_PROP_UTF8ONLY: 1482 *value = 0; 1483 break; 1484 case ZFS_PROP_CASE: 1485 *value = ZFS_CASE_SENSITIVE; 1486 break; 1487 default: 1488 return (error); 1489 } 1490 error = 0; 1491 } 1492 return (error); 1493} 1494