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) 2012 by Delphix. All rights reserved. 24 */ 25 26 /* Portions Copyright 2010 Robert Milkowski */ 27 28 #include <sys/types.h> 29 #include <sys/param.h> 30 #include <sys/systm.h> 31 #include <sys/sysmacros.h> 32 #include <sys/kmem.h> 33 #include <sys/pathname.h> 34 #include <sys/vnode.h> 35 #include <sys/vfs.h> 36 #include <sys/vfs_opreg.h> 37 #include <sys/mntent.h> 38 #include <sys/mount.h> 39 #include <sys/cmn_err.h> 40 #include "fs/fs_subr.h" 41 #include <sys/zfs_znode.h> 42 #include <sys/zfs_dir.h> 43 #include <sys/zil.h> 44 #include <sys/fs/zfs.h> 45 #include <sys/dmu.h> 46 #include <sys/dsl_prop.h> 47 #include <sys/dsl_dataset.h> 48 #include <sys/dsl_deleg.h> 49 #include <sys/spa.h> 50 #include <sys/zap.h> 51 #include <sys/sa.h> 52 #include <sys/varargs.h> 53 #include <sys/policy.h> 54 #include <sys/atomic.h> 55 #include <sys/mkdev.h> 56 #include <sys/modctl.h> 57 #include <sys/refstr.h> 58 #include <sys/zfs_ioctl.h> 59 #include <sys/zfs_ctldir.h> 60 #include <sys/zfs_fuid.h> 61 #include <sys/bootconf.h> 62 #include <sys/sunddi.h> 63 #include <sys/dnlc.h> 64 #include <sys/dmu_objset.h> 65 #include <sys/spa_boot.h> 66 #include <sys/sa.h> 67 #include "zfs_comutil.h" 68 69 int zfsfstype; 70 vfsops_t *zfs_vfsops = NULL; 71 static major_t zfs_major; 72 static minor_t zfs_minor; 73 static kmutex_t zfs_dev_mtx; 74 75 extern int sys_shutdown; 76 77 static int zfs_mount(vfs_t *vfsp, vnode_t *mvp, struct mounta *uap, cred_t *cr); 78 static int zfs_umount(vfs_t *vfsp, int fflag, cred_t *cr); 79 static int zfs_mountroot(vfs_t *vfsp, enum whymountroot); 80 static int zfs_root(vfs_t *vfsp, vnode_t **vpp); 81 static int zfs_statvfs(vfs_t *vfsp, struct statvfs64 *statp); 82 static int zfs_vget(vfs_t *vfsp, vnode_t **vpp, fid_t *fidp); 83 static void zfs_freevfs(vfs_t *vfsp); 84 85 static const fs_operation_def_t zfs_vfsops_template[] = { 86 VFSNAME_MOUNT, { .vfs_mount = zfs_mount }, 87 VFSNAME_MOUNTROOT, { .vfs_mountroot = zfs_mountroot }, 88 VFSNAME_UNMOUNT, { .vfs_unmount = zfs_umount }, 89 VFSNAME_ROOT, { .vfs_root = zfs_root }, 90 VFSNAME_STATVFS, { .vfs_statvfs = zfs_statvfs }, 91 VFSNAME_SYNC, { .vfs_sync = zfs_sync }, 92 VFSNAME_VGET, { .vfs_vget = zfs_vget }, 93 VFSNAME_FREEVFS, { .vfs_freevfs = zfs_freevfs }, 94 NULL, NULL 95 }; 96 97 static const fs_operation_def_t zfs_vfsops_eio_template[] = { 98 VFSNAME_FREEVFS, { .vfs_freevfs = zfs_freevfs }, 99 NULL, NULL 100 }; 101 102 /* 103 * We need to keep a count of active fs's. 104 * This is necessary to prevent our module 105 * from being unloaded after a umount -f 106 */ 107 static uint32_t zfs_active_fs_count = 0; 108 109 static char *noatime_cancel[] = { MNTOPT_ATIME, NULL }; 110 static char *atime_cancel[] = { MNTOPT_NOATIME, NULL }; 111 static char *noxattr_cancel[] = { MNTOPT_XATTR, NULL }; 112 static char *xattr_cancel[] = { MNTOPT_NOXATTR, NULL }; 113 114 /* 115 * MO_DEFAULT is not used since the default value is determined 116 * by the equivalent property. 117 */ 118 static mntopt_t mntopts[] = { 119 { MNTOPT_NOXATTR, noxattr_cancel, NULL, 0, NULL }, 120 { MNTOPT_XATTR, xattr_cancel, NULL, 0, NULL }, 121 { MNTOPT_NOATIME, noatime_cancel, NULL, 0, NULL }, 122 { MNTOPT_ATIME, atime_cancel, NULL, 0, NULL } 123 }; 124 125 static mntopts_t zfs_mntopts = { 126 sizeof (mntopts) / sizeof (mntopt_t), 127 mntopts 128 }; 129 130 /*ARGSUSED*/ 131 int 132 zfs_sync(vfs_t *vfsp, short flag, cred_t *cr) 133 { 134 /* 135 * Data integrity is job one. We don't want a compromised kernel 136 * writing to the storage pool, so we never sync during panic. 137 */ 138 if (panicstr) 139 return (0); 140 141 /* 142 * SYNC_ATTR is used by fsflush() to force old filesystems like UFS 143 * to sync metadata, which they would otherwise cache indefinitely. 144 * Semantically, the only requirement is that the sync be initiated. 145 * The DMU syncs out txgs frequently, so there's nothing to do. 146 */ 147 if (flag & SYNC_ATTR) 148 return (0); 149 150 if (vfsp != NULL) { 151 /* 152 * Sync a specific filesystem. 153 */ 154 zfsvfs_t *zfsvfs = vfsp->vfs_data; 155 dsl_pool_t *dp; 156 157 ZFS_ENTER(zfsvfs); 158 dp = dmu_objset_pool(zfsvfs->z_os); 159 160 /* 161 * If the system is shutting down, then skip any 162 * filesystems which may exist on a suspended pool. 163 */ 164 if (sys_shutdown && spa_suspended(dp->dp_spa)) { 165 ZFS_EXIT(zfsvfs); 166 return (0); 167 } 168 169 if (zfsvfs->z_log != NULL) 170 zil_commit(zfsvfs->z_log, 0); 171 172 ZFS_EXIT(zfsvfs); 173 } else { 174 /* 175 * Sync all ZFS filesystems. This is what happens when you 176 * run sync(1M). Unlike other filesystems, ZFS honors the 177 * request by waiting for all pools to commit all dirty data. 178 */ 179 spa_sync_allpools(); 180 } 181 182 return (0); 183 } 184 185 static int 186 zfs_create_unique_device(dev_t *dev) 187 { 188 major_t new_major; 189 190 do { 191 ASSERT3U(zfs_minor, <=, MAXMIN32); 192 minor_t start = zfs_minor; 193 do { 194 mutex_enter(&zfs_dev_mtx); 195 if (zfs_minor >= MAXMIN32) { 196 /* 197 * If we're still using the real major 198 * keep out of /dev/zfs and /dev/zvol minor 199 * number space. If we're using a getudev()'ed 200 * major number, we can use all of its minors. 201 */ 202 if (zfs_major == ddi_name_to_major(ZFS_DRIVER)) 203 zfs_minor = ZFS_MIN_MINOR; 204 else 205 zfs_minor = 0; 206 } else { 207 zfs_minor++; 208 } 209 *dev = makedevice(zfs_major, zfs_minor); 210 mutex_exit(&zfs_dev_mtx); 211 } while (vfs_devismounted(*dev) && zfs_minor != start); 212 if (zfs_minor == start) { 213 /* 214 * We are using all ~262,000 minor numbers for the 215 * current major number. Create a new major number. 216 */ 217 if ((new_major = getudev()) == (major_t)-1) { 218 cmn_err(CE_WARN, 219 "zfs_mount: Can't get unique major " 220 "device number."); 221 return (-1); 222 } 223 mutex_enter(&zfs_dev_mtx); 224 zfs_major = new_major; 225 zfs_minor = 0; 226 227 mutex_exit(&zfs_dev_mtx); 228 } else { 229 break; 230 } 231 /* CONSTANTCONDITION */ 232 } while (1); 233 234 return (0); 235 } 236 237 static void 238 atime_changed_cb(void *arg, uint64_t newval) 239 { 240 zfsvfs_t *zfsvfs = arg; 241 242 if (newval == TRUE) { 243 zfsvfs->z_atime = TRUE; 244 vfs_clearmntopt(zfsvfs->z_vfs, MNTOPT_NOATIME); 245 vfs_setmntopt(zfsvfs->z_vfs, MNTOPT_ATIME, NULL, 0); 246 } else { 247 zfsvfs->z_atime = FALSE; 248 vfs_clearmntopt(zfsvfs->z_vfs, MNTOPT_ATIME); 249 vfs_setmntopt(zfsvfs->z_vfs, MNTOPT_NOATIME, NULL, 0); 250 } 251 } 252 253 static void 254 xattr_changed_cb(void *arg, uint64_t newval) 255 { 256 zfsvfs_t *zfsvfs = arg; 257 258 if (newval == TRUE) { 259 /* XXX locking on vfs_flag? */ 260 zfsvfs->z_vfs->vfs_flag |= VFS_XATTR; 261 vfs_clearmntopt(zfsvfs->z_vfs, MNTOPT_NOXATTR); 262 vfs_setmntopt(zfsvfs->z_vfs, MNTOPT_XATTR, NULL, 0); 263 } else { 264 /* XXX locking on vfs_flag? */ 265 zfsvfs->z_vfs->vfs_flag &= ~VFS_XATTR; 266 vfs_clearmntopt(zfsvfs->z_vfs, MNTOPT_XATTR); 267 vfs_setmntopt(zfsvfs->z_vfs, MNTOPT_NOXATTR, NULL, 0); 268 } 269 } 270 271 static void 272 blksz_changed_cb(void *arg, uint64_t newval) 273 { 274 zfsvfs_t *zfsvfs = arg; 275 276 if (newval < SPA_MINBLOCKSIZE || 277 newval > SPA_MAXBLOCKSIZE || !ISP2(newval)) 278 newval = SPA_MAXBLOCKSIZE; 279 280 zfsvfs->z_max_blksz = newval; 281 zfsvfs->z_vfs->vfs_bsize = newval; 282 } 283 284 static void 285 readonly_changed_cb(void *arg, uint64_t newval) 286 { 287 zfsvfs_t *zfsvfs = arg; 288 289 if (newval) { 290 /* XXX locking on vfs_flag? */ 291 zfsvfs->z_vfs->vfs_flag |= VFS_RDONLY; 292 vfs_clearmntopt(zfsvfs->z_vfs, MNTOPT_RW); 293 vfs_setmntopt(zfsvfs->z_vfs, MNTOPT_RO, NULL, 0); 294 } else { 295 /* XXX locking on vfs_flag? */ 296 zfsvfs->z_vfs->vfs_flag &= ~VFS_RDONLY; 297 vfs_clearmntopt(zfsvfs->z_vfs, MNTOPT_RO); 298 vfs_setmntopt(zfsvfs->z_vfs, MNTOPT_RW, NULL, 0); 299 } 300 } 301 302 static void 303 devices_changed_cb(void *arg, uint64_t newval) 304 { 305 zfsvfs_t *zfsvfs = arg; 306 307 if (newval == FALSE) { 308 zfsvfs->z_vfs->vfs_flag |= VFS_NODEVICES; 309 vfs_clearmntopt(zfsvfs->z_vfs, MNTOPT_DEVICES); 310 vfs_setmntopt(zfsvfs->z_vfs, MNTOPT_NODEVICES, NULL, 0); 311 } else { 312 zfsvfs->z_vfs->vfs_flag &= ~VFS_NODEVICES; 313 vfs_clearmntopt(zfsvfs->z_vfs, MNTOPT_NODEVICES); 314 vfs_setmntopt(zfsvfs->z_vfs, MNTOPT_DEVICES, NULL, 0); 315 } 316 } 317 318 static void 319 setuid_changed_cb(void *arg, uint64_t newval) 320 { 321 zfsvfs_t *zfsvfs = arg; 322 323 if (newval == FALSE) { 324 zfsvfs->z_vfs->vfs_flag |= VFS_NOSETUID; 325 vfs_clearmntopt(zfsvfs->z_vfs, MNTOPT_SETUID); 326 vfs_setmntopt(zfsvfs->z_vfs, MNTOPT_NOSETUID, NULL, 0); 327 } else { 328 zfsvfs->z_vfs->vfs_flag &= ~VFS_NOSETUID; 329 vfs_clearmntopt(zfsvfs->z_vfs, MNTOPT_NOSETUID); 330 vfs_setmntopt(zfsvfs->z_vfs, MNTOPT_SETUID, NULL, 0); 331 } 332 } 333 334 static void 335 exec_changed_cb(void *arg, uint64_t newval) 336 { 337 zfsvfs_t *zfsvfs = arg; 338 339 if (newval == FALSE) { 340 zfsvfs->z_vfs->vfs_flag |= VFS_NOEXEC; 341 vfs_clearmntopt(zfsvfs->z_vfs, MNTOPT_EXEC); 342 vfs_setmntopt(zfsvfs->z_vfs, MNTOPT_NOEXEC, NULL, 0); 343 } else { 344 zfsvfs->z_vfs->vfs_flag &= ~VFS_NOEXEC; 345 vfs_clearmntopt(zfsvfs->z_vfs, MNTOPT_NOEXEC); 346 vfs_setmntopt(zfsvfs->z_vfs, MNTOPT_EXEC, NULL, 0); 347 } 348 } 349 350 /* 351 * The nbmand mount option can be changed at mount time. 352 * We can't allow it to be toggled on live file systems or incorrect 353 * behavior may be seen from cifs clients 354 * 355 * This property isn't registered via dsl_prop_register(), but this callback 356 * will be called when a file system is first mounted 357 */ 358 static void 359 nbmand_changed_cb(void *arg, uint64_t newval) 360 { 361 zfsvfs_t *zfsvfs = arg; 362 if (newval == FALSE) { 363 vfs_clearmntopt(zfsvfs->z_vfs, MNTOPT_NBMAND); 364 vfs_setmntopt(zfsvfs->z_vfs, MNTOPT_NONBMAND, NULL, 0); 365 } else { 366 vfs_clearmntopt(zfsvfs->z_vfs, MNTOPT_NONBMAND); 367 vfs_setmntopt(zfsvfs->z_vfs, MNTOPT_NBMAND, NULL, 0); 368 } 369 } 370 371 static void 372 snapdir_changed_cb(void *arg, uint64_t newval) 373 { 374 zfsvfs_t *zfsvfs = arg; 375 376 zfsvfs->z_show_ctldir = newval; 377 } 378 379 static void 380 vscan_changed_cb(void *arg, uint64_t newval) 381 { 382 zfsvfs_t *zfsvfs = arg; 383 384 zfsvfs->z_vscan = newval; 385 } 386 387 static void 388 acl_mode_changed_cb(void *arg, uint64_t newval) 389 { 390 zfsvfs_t *zfsvfs = arg; 391 392 zfsvfs->z_acl_mode = newval; 393 } 394 395 static void 396 acl_inherit_changed_cb(void *arg, uint64_t newval) 397 { 398 zfsvfs_t *zfsvfs = arg; 399 400 zfsvfs->z_acl_inherit = newval; 401 } 402 403 static int 404 zfs_register_callbacks(vfs_t *vfsp) 405 { 406 struct dsl_dataset *ds = NULL; 407 objset_t *os = NULL; 408 zfsvfs_t *zfsvfs = NULL; 409 uint64_t nbmand; 410 int readonly, do_readonly = B_FALSE; 411 int setuid, do_setuid = B_FALSE; 412 int exec, do_exec = B_FALSE; 413 int devices, do_devices = B_FALSE; 414 int xattr, do_xattr = B_FALSE; 415 int atime, do_atime = B_FALSE; 416 int error = 0; 417 418 ASSERT(vfsp); 419 zfsvfs = vfsp->vfs_data; 420 ASSERT(zfsvfs); 421 os = zfsvfs->z_os; 422 423 /* 424 * The act of registering our callbacks will destroy any mount 425 * options we may have. In order to enable temporary overrides 426 * of mount options, we stash away the current values and 427 * restore them after we register the callbacks. 428 */ 429 if (vfs_optionisset(vfsp, MNTOPT_RO, NULL) || 430 !spa_writeable(dmu_objset_spa(os))) { 431 readonly = B_TRUE; 432 do_readonly = B_TRUE; 433 } else if (vfs_optionisset(vfsp, MNTOPT_RW, NULL)) { 434 readonly = B_FALSE; 435 do_readonly = B_TRUE; 436 } 437 if (vfs_optionisset(vfsp, MNTOPT_NOSUID, NULL)) { 438 devices = B_FALSE; 439 setuid = B_FALSE; 440 do_devices = B_TRUE; 441 do_setuid = B_TRUE; 442 } else { 443 if (vfs_optionisset(vfsp, MNTOPT_NODEVICES, NULL)) { 444 devices = B_FALSE; 445 do_devices = B_TRUE; 446 } else if (vfs_optionisset(vfsp, MNTOPT_DEVICES, NULL)) { 447 devices = B_TRUE; 448 do_devices = B_TRUE; 449 } 450 451 if (vfs_optionisset(vfsp, MNTOPT_NOSETUID, NULL)) { 452 setuid = B_FALSE; 453 do_setuid = B_TRUE; 454 } else if (vfs_optionisset(vfsp, MNTOPT_SETUID, NULL)) { 455 setuid = B_TRUE; 456 do_setuid = B_TRUE; 457 } 458 } 459 if (vfs_optionisset(vfsp, MNTOPT_NOEXEC, NULL)) { 460 exec = B_FALSE; 461 do_exec = B_TRUE; 462 } else if (vfs_optionisset(vfsp, MNTOPT_EXEC, NULL)) { 463 exec = B_TRUE; 464 do_exec = B_TRUE; 465 } 466 if (vfs_optionisset(vfsp, MNTOPT_NOXATTR, NULL)) { 467 xattr = B_FALSE; 468 do_xattr = B_TRUE; 469 } else if (vfs_optionisset(vfsp, MNTOPT_XATTR, NULL)) { 470 xattr = B_TRUE; 471 do_xattr = B_TRUE; 472 } 473 if (vfs_optionisset(vfsp, MNTOPT_NOATIME, NULL)) { 474 atime = B_FALSE; 475 do_atime = B_TRUE; 476 } else if (vfs_optionisset(vfsp, MNTOPT_ATIME, NULL)) { 477 atime = B_TRUE; 478 do_atime = B_TRUE; 479 } 480 481 /* 482 * nbmand is a special property. It can only be changed at 483 * mount time. 484 * 485 * This is weird, but it is documented to only be changeable 486 * at mount time. 487 */ 488 if (vfs_optionisset(vfsp, MNTOPT_NONBMAND, NULL)) { 489 nbmand = B_FALSE; 490 } else if (vfs_optionisset(vfsp, MNTOPT_NBMAND, NULL)) { 491 nbmand = B_TRUE; 492 } else { 493 char osname[MAXNAMELEN]; 494 495 dmu_objset_name(os, osname); 496 if (error = dsl_prop_get_integer(osname, "nbmand", &nbmand, 497 NULL)) { 498 return (error); 499 } 500 } 501 502 /* 503 * Register property callbacks. 504 * 505 * It would probably be fine to just check for i/o error from 506 * the first prop_register(), but I guess I like to go 507 * overboard... 508 */ 509 ds = dmu_objset_ds(os); 510 error = dsl_prop_register(ds, "atime", atime_changed_cb, zfsvfs); 511 error = error ? error : dsl_prop_register(ds, 512 "xattr", xattr_changed_cb, zfsvfs); 513 error = error ? error : dsl_prop_register(ds, 514 "recordsize", blksz_changed_cb, zfsvfs); 515 error = error ? error : dsl_prop_register(ds, 516 "readonly", readonly_changed_cb, zfsvfs); 517 error = error ? error : dsl_prop_register(ds, 518 "devices", devices_changed_cb, zfsvfs); 519 error = error ? error : dsl_prop_register(ds, 520 "setuid", setuid_changed_cb, zfsvfs); 521 error = error ? error : dsl_prop_register(ds, 522 "exec", exec_changed_cb, zfsvfs); 523 error = error ? error : dsl_prop_register(ds, 524 "snapdir", snapdir_changed_cb, zfsvfs); 525 error = error ? error : dsl_prop_register(ds, 526 "aclmode", acl_mode_changed_cb, zfsvfs); 527 error = error ? error : dsl_prop_register(ds, 528 "aclinherit", acl_inherit_changed_cb, zfsvfs); 529 error = error ? error : dsl_prop_register(ds, 530 "vscan", vscan_changed_cb, zfsvfs); 531 if (error) 532 goto unregister; 533 534 /* 535 * Invoke our callbacks to restore temporary mount options. 536 */ 537 if (do_readonly) 538 readonly_changed_cb(zfsvfs, readonly); 539 if (do_setuid) 540 setuid_changed_cb(zfsvfs, setuid); 541 if (do_exec) 542 exec_changed_cb(zfsvfs, exec); 543 if (do_devices) 544 devices_changed_cb(zfsvfs, devices); 545 if (do_xattr) 546 xattr_changed_cb(zfsvfs, xattr); 547 if (do_atime) 548 atime_changed_cb(zfsvfs, atime); 549 550 nbmand_changed_cb(zfsvfs, nbmand); 551 552 return (0); 553 554 unregister: 555 /* 556 * We may attempt to unregister some callbacks that are not 557 * registered, but this is OK; it will simply return ENOMSG, 558 * which we will ignore. 559 */ 560 (void) dsl_prop_unregister(ds, "atime", atime_changed_cb, zfsvfs); 561 (void) dsl_prop_unregister(ds, "xattr", xattr_changed_cb, zfsvfs); 562 (void) dsl_prop_unregister(ds, "recordsize", blksz_changed_cb, zfsvfs); 563 (void) dsl_prop_unregister(ds, "readonly", readonly_changed_cb, zfsvfs); 564 (void) dsl_prop_unregister(ds, "devices", devices_changed_cb, zfsvfs); 565 (void) dsl_prop_unregister(ds, "setuid", setuid_changed_cb, zfsvfs); 566 (void) dsl_prop_unregister(ds, "exec", exec_changed_cb, zfsvfs); 567 (void) dsl_prop_unregister(ds, "snapdir", snapdir_changed_cb, zfsvfs); 568 (void) dsl_prop_unregister(ds, "aclmode", acl_mode_changed_cb, zfsvfs); 569 (void) dsl_prop_unregister(ds, "aclinherit", acl_inherit_changed_cb, 570 zfsvfs); 571 (void) dsl_prop_unregister(ds, "vscan", vscan_changed_cb, zfsvfs); 572 return (error); 573 574 } 575 576 static int 577 zfs_space_delta_cb(dmu_object_type_t bonustype, void *data, 578 uint64_t *userp, uint64_t *groupp) 579 { 580 znode_phys_t *znp = data; 581 int error = 0; 582 583 /* 584 * Is it a valid type of object to track? 585 */ 586 if (bonustype != DMU_OT_ZNODE && bonustype != DMU_OT_SA) 587 return (ENOENT); 588 589 /* 590 * If we have a NULL data pointer 591 * then assume the id's aren't changing and 592 * return EEXIST to the dmu to let it know to 593 * use the same ids 594 */ 595 if (data == NULL) 596 return (EEXIST); 597 598 if (bonustype == DMU_OT_ZNODE) { 599 *userp = znp->zp_uid; 600 *groupp = znp->zp_gid; 601 } else { 602 int hdrsize; 603 604 ASSERT(bonustype == DMU_OT_SA); 605 hdrsize = sa_hdrsize(data); 606 607 if (hdrsize != 0) { 608 *userp = *((uint64_t *)((uintptr_t)data + hdrsize + 609 SA_UID_OFFSET)); 610 *groupp = *((uint64_t *)((uintptr_t)data + hdrsize + 611 SA_GID_OFFSET)); 612 } else { 613 /* 614 * This should only happen for newly created 615 * files that haven't had the znode data filled 616 * in yet. 617 */ 618 *userp = 0; 619 *groupp = 0; 620 } 621 } 622 return (error); 623 } 624 625 static void 626 fuidstr_to_sid(zfsvfs_t *zfsvfs, const char *fuidstr, 627 char *domainbuf, int buflen, uid_t *ridp) 628 { 629 uint64_t fuid; 630 const char *domain; 631 632 fuid = strtonum(fuidstr, NULL); 633 634 domain = zfs_fuid_find_by_idx(zfsvfs, FUID_INDEX(fuid)); 635 if (domain) 636 (void) strlcpy(domainbuf, domain, buflen); 637 else 638 domainbuf[0] = '\0'; 639 *ridp = FUID_RID(fuid); 640 } 641 642 static uint64_t 643 zfs_userquota_prop_to_obj(zfsvfs_t *zfsvfs, zfs_userquota_prop_t type) 644 { 645 switch (type) { 646 case ZFS_PROP_USERUSED: 647 return (DMU_USERUSED_OBJECT); 648 case ZFS_PROP_GROUPUSED: 649 return (DMU_GROUPUSED_OBJECT); 650 case ZFS_PROP_USERQUOTA: 651 return (zfsvfs->z_userquota_obj); 652 case ZFS_PROP_GROUPQUOTA: 653 return (zfsvfs->z_groupquota_obj); 654 } 655 return (0); 656 } 657 658 int 659 zfs_userspace_many(zfsvfs_t *zfsvfs, zfs_userquota_prop_t type, 660 uint64_t *cookiep, void *vbuf, uint64_t *bufsizep) 661 { 662 int error; 663 zap_cursor_t zc; 664 zap_attribute_t za; 665 zfs_useracct_t *buf = vbuf; 666 uint64_t obj; 667 668 if (!dmu_objset_userspace_present(zfsvfs->z_os)) 669 return (ENOTSUP); 670 671 obj = zfs_userquota_prop_to_obj(zfsvfs, type); 672 if (obj == 0) { 673 *bufsizep = 0; 674 return (0); 675 } 676 677 for (zap_cursor_init_serialized(&zc, zfsvfs->z_os, obj, *cookiep); 678 (error = zap_cursor_retrieve(&zc, &za)) == 0; 679 zap_cursor_advance(&zc)) { 680 if ((uintptr_t)buf - (uintptr_t)vbuf + sizeof (zfs_useracct_t) > 681 *bufsizep) 682 break; 683 684 fuidstr_to_sid(zfsvfs, za.za_name, 685 buf->zu_domain, sizeof (buf->zu_domain), &buf->zu_rid); 686 687 buf->zu_space = za.za_first_integer; 688 buf++; 689 } 690 if (error == ENOENT) 691 error = 0; 692 693 ASSERT3U((uintptr_t)buf - (uintptr_t)vbuf, <=, *bufsizep); 694 *bufsizep = (uintptr_t)buf - (uintptr_t)vbuf; 695 *cookiep = zap_cursor_serialize(&zc); 696 zap_cursor_fini(&zc); 697 return (error); 698 } 699 700 /* 701 * buf must be big enough (eg, 32 bytes) 702 */ 703 static int 704 id_to_fuidstr(zfsvfs_t *zfsvfs, const char *domain, uid_t rid, 705 char *buf, boolean_t addok) 706 { 707 uint64_t fuid; 708 int domainid = 0; 709 710 if (domain && domain[0]) { 711 domainid = zfs_fuid_find_by_domain(zfsvfs, domain, NULL, addok); 712 if (domainid == -1) 713 return (ENOENT); 714 } 715 fuid = FUID_ENCODE(domainid, rid); 716 (void) sprintf(buf, "%llx", (longlong_t)fuid); 717 return (0); 718 } 719 720 int 721 zfs_userspace_one(zfsvfs_t *zfsvfs, zfs_userquota_prop_t type, 722 const char *domain, uint64_t rid, uint64_t *valp) 723 { 724 char buf[32]; 725 int err; 726 uint64_t obj; 727 728 *valp = 0; 729 730 if (!dmu_objset_userspace_present(zfsvfs->z_os)) 731 return (ENOTSUP); 732 733 obj = zfs_userquota_prop_to_obj(zfsvfs, type); 734 if (obj == 0) 735 return (0); 736 737 err = id_to_fuidstr(zfsvfs, domain, rid, buf, B_FALSE); 738 if (err) 739 return (err); 740 741 err = zap_lookup(zfsvfs->z_os, obj, buf, 8, 1, valp); 742 if (err == ENOENT) 743 err = 0; 744 return (err); 745 } 746 747 int 748 zfs_set_userquota(zfsvfs_t *zfsvfs, zfs_userquota_prop_t type, 749 const char *domain, uint64_t rid, uint64_t quota) 750 { 751 char buf[32]; 752 int err; 753 dmu_tx_t *tx; 754 uint64_t *objp; 755 boolean_t fuid_dirtied; 756 757 if (type != ZFS_PROP_USERQUOTA && type != ZFS_PROP_GROUPQUOTA) 758 return (EINVAL); 759 760 if (zfsvfs->z_version < ZPL_VERSION_USERSPACE) 761 return (ENOTSUP); 762 763 objp = (type == ZFS_PROP_USERQUOTA) ? &zfsvfs->z_userquota_obj : 764 &zfsvfs->z_groupquota_obj; 765 766 err = id_to_fuidstr(zfsvfs, domain, rid, buf, B_TRUE); 767 if (err) 768 return (err); 769 fuid_dirtied = zfsvfs->z_fuid_dirty; 770 771 tx = dmu_tx_create(zfsvfs->z_os); 772 dmu_tx_hold_zap(tx, *objp ? *objp : DMU_NEW_OBJECT, B_TRUE, NULL); 773 if (*objp == 0) { 774 dmu_tx_hold_zap(tx, MASTER_NODE_OBJ, B_TRUE, 775 zfs_userquota_prop_prefixes[type]); 776 } 777 if (fuid_dirtied) 778 zfs_fuid_txhold(zfsvfs, tx); 779 err = dmu_tx_assign(tx, TXG_WAIT); 780 if (err) { 781 dmu_tx_abort(tx); 782 return (err); 783 } 784 785 mutex_enter(&zfsvfs->z_lock); 786 if (*objp == 0) { 787 *objp = zap_create(zfsvfs->z_os, DMU_OT_USERGROUP_QUOTA, 788 DMU_OT_NONE, 0, tx); 789 VERIFY(0 == zap_add(zfsvfs->z_os, MASTER_NODE_OBJ, 790 zfs_userquota_prop_prefixes[type], 8, 1, objp, tx)); 791 } 792 mutex_exit(&zfsvfs->z_lock); 793 794 if (quota == 0) { 795 err = zap_remove(zfsvfs->z_os, *objp, buf, tx); 796 if (err == ENOENT) 797 err = 0; 798 } else { 799 err = zap_update(zfsvfs->z_os, *objp, buf, 8, 1, "a, tx); 800 } 801 ASSERT(err == 0); 802 if (fuid_dirtied) 803 zfs_fuid_sync(zfsvfs, tx); 804 dmu_tx_commit(tx); 805 return (err); 806 } 807 808 boolean_t 809 zfs_fuid_overquota(zfsvfs_t *zfsvfs, boolean_t isgroup, uint64_t fuid) 810 { 811 char buf[32]; 812 uint64_t used, quota, usedobj, quotaobj; 813 int err; 814 815 usedobj = isgroup ? DMU_GROUPUSED_OBJECT : DMU_USERUSED_OBJECT; 816 quotaobj = isgroup ? zfsvfs->z_groupquota_obj : zfsvfs->z_userquota_obj; 817 818 if (quotaobj == 0 || zfsvfs->z_replay) 819 return (B_FALSE); 820 821 (void) sprintf(buf, "%llx", (longlong_t)fuid); 822 err = zap_lookup(zfsvfs->z_os, quotaobj, buf, 8, 1, "a); 823 if (err != 0) 824 return (B_FALSE); 825 826 err = zap_lookup(zfsvfs->z_os, usedobj, buf, 8, 1, &used); 827 if (err != 0) 828 return (B_FALSE); 829 return (used >= quota); 830 } 831 832 boolean_t 833 zfs_owner_overquota(zfsvfs_t *zfsvfs, znode_t *zp, boolean_t isgroup) 834 { 835 uint64_t fuid; 836 uint64_t quotaobj; 837 838 quotaobj = isgroup ? zfsvfs->z_groupquota_obj : zfsvfs->z_userquota_obj; 839 840 fuid = isgroup ? zp->z_gid : zp->z_uid; 841 842 if (quotaobj == 0 || zfsvfs->z_replay) 843 return (B_FALSE); 844 845 return (zfs_fuid_overquota(zfsvfs, isgroup, fuid)); 846 } 847 848 int 849 zfsvfs_create(const char *osname, zfsvfs_t **zfvp) 850 { 851 objset_t *os; 852 zfsvfs_t *zfsvfs; 853 uint64_t zval; 854 int i, error; 855 uint64_t sa_obj; 856 857 zfsvfs = kmem_zalloc(sizeof (zfsvfs_t), KM_SLEEP); 858 859 /* 860 * We claim to always be readonly so we can open snapshots; 861 * other ZPL code will prevent us from writing to snapshots. 862 */ 863 error = dmu_objset_own(osname, DMU_OST_ZFS, B_TRUE, zfsvfs, &os); 864 if (error) { 865 kmem_free(zfsvfs, sizeof (zfsvfs_t)); 866 return (error); 867 } 868 869 /* 870 * Initialize the zfs-specific filesystem structure. 871 * Should probably make this a kmem cache, shuffle fields, 872 * and just bzero up to z_hold_mtx[]. 873 */ 874 zfsvfs->z_vfs = NULL; 875 zfsvfs->z_parent = zfsvfs; 876 zfsvfs->z_max_blksz = SPA_MAXBLOCKSIZE; 877 zfsvfs->z_show_ctldir = ZFS_SNAPDIR_VISIBLE; 878 zfsvfs->z_os = os; 879 880 error = zfs_get_zplprop(os, ZFS_PROP_VERSION, &zfsvfs->z_version); 881 if (error) { 882 goto out; 883 } else if (zfsvfs->z_version > 884 zfs_zpl_version_map(spa_version(dmu_objset_spa(os)))) { 885 (void) printf("Can't mount a version %lld file system " 886 "on a version %lld pool\n. Pool must be upgraded to mount " 887 "this file system.", (u_longlong_t)zfsvfs->z_version, 888 (u_longlong_t)spa_version(dmu_objset_spa(os))); 889 error = ENOTSUP; 890 goto out; 891 } 892 if ((error = zfs_get_zplprop(os, ZFS_PROP_NORMALIZE, &zval)) != 0) 893 goto out; 894 zfsvfs->z_norm = (int)zval; 895 896 if ((error = zfs_get_zplprop(os, ZFS_PROP_UTF8ONLY, &zval)) != 0) 897 goto out; 898 zfsvfs->z_utf8 = (zval != 0); 899 900 if ((error = zfs_get_zplprop(os, ZFS_PROP_CASE, &zval)) != 0) 901 goto out; 902 zfsvfs->z_case = (uint_t)zval; 903 904 /* 905 * Fold case on file systems that are always or sometimes case 906 * insensitive. 907 */ 908 if (zfsvfs->z_case == ZFS_CASE_INSENSITIVE || 909 zfsvfs->z_case == ZFS_CASE_MIXED) 910 zfsvfs->z_norm |= U8_TEXTPREP_TOUPPER; 911 912 zfsvfs->z_use_fuids = USE_FUIDS(zfsvfs->z_version, zfsvfs->z_os); 913 zfsvfs->z_use_sa = USE_SA(zfsvfs->z_version, zfsvfs->z_os); 914 915 if (zfsvfs->z_use_sa) { 916 /* should either have both of these objects or none */ 917 error = zap_lookup(os, MASTER_NODE_OBJ, ZFS_SA_ATTRS, 8, 1, 918 &sa_obj); 919 if (error) 920 return (error); 921 } else { 922 /* 923 * Pre SA versions file systems should never touch 924 * either the attribute registration or layout objects. 925 */ 926 sa_obj = 0; 927 } 928 929 error = sa_setup(os, sa_obj, zfs_attr_table, ZPL_END, 930 &zfsvfs->z_attr_table); 931 if (error) 932 goto out; 933 934 if (zfsvfs->z_version >= ZPL_VERSION_SA) 935 sa_register_update_callback(os, zfs_sa_upgrade); 936 937 error = zap_lookup(os, MASTER_NODE_OBJ, ZFS_ROOT_OBJ, 8, 1, 938 &zfsvfs->z_root); 939 if (error) 940 goto out; 941 ASSERT(zfsvfs->z_root != 0); 942 943 error = zap_lookup(os, MASTER_NODE_OBJ, ZFS_UNLINKED_SET, 8, 1, 944 &zfsvfs->z_unlinkedobj); 945 if (error) 946 goto out; 947 948 error = zap_lookup(os, MASTER_NODE_OBJ, 949 zfs_userquota_prop_prefixes[ZFS_PROP_USERQUOTA], 950 8, 1, &zfsvfs->z_userquota_obj); 951 if (error && error != ENOENT) 952 goto out; 953 954 error = zap_lookup(os, MASTER_NODE_OBJ, 955 zfs_userquota_prop_prefixes[ZFS_PROP_GROUPQUOTA], 956 8, 1, &zfsvfs->z_groupquota_obj); 957 if (error && error != ENOENT) 958 goto out; 959 960 error = zap_lookup(os, MASTER_NODE_OBJ, ZFS_FUID_TABLES, 8, 1, 961 &zfsvfs->z_fuid_obj); 962 if (error && error != ENOENT) 963 goto out; 964 965 error = zap_lookup(os, MASTER_NODE_OBJ, ZFS_SHARES_DIR, 8, 1, 966 &zfsvfs->z_shares_dir); 967 if (error && error != ENOENT) 968 goto out; 969 970 mutex_init(&zfsvfs->z_znodes_lock, NULL, MUTEX_DEFAULT, NULL); 971 mutex_init(&zfsvfs->z_lock, NULL, MUTEX_DEFAULT, NULL); 972 list_create(&zfsvfs->z_all_znodes, sizeof (znode_t), 973 offsetof(znode_t, z_link_node)); 974 rrw_init(&zfsvfs->z_teardown_lock); 975 rw_init(&zfsvfs->z_teardown_inactive_lock, NULL, RW_DEFAULT, NULL); 976 rw_init(&zfsvfs->z_fuid_lock, NULL, RW_DEFAULT, NULL); 977 for (i = 0; i != ZFS_OBJ_MTX_SZ; i++) 978 mutex_init(&zfsvfs->z_hold_mtx[i], NULL, MUTEX_DEFAULT, NULL); 979 980 *zfvp = zfsvfs; 981 return (0); 982 983 out: 984 dmu_objset_disown(os, zfsvfs); 985 *zfvp = NULL; 986 kmem_free(zfsvfs, sizeof (zfsvfs_t)); 987 return (error); 988 } 989 990 static int 991 zfsvfs_setup(zfsvfs_t *zfsvfs, boolean_t mounting) 992 { 993 int error; 994 995 error = zfs_register_callbacks(zfsvfs->z_vfs); 996 if (error) 997 return (error); 998 999 /* 1000 * Set the objset user_ptr to track its zfsvfs. 1001 */ 1002 mutex_enter(&zfsvfs->z_os->os_user_ptr_lock); 1003 dmu_objset_set_user(zfsvfs->z_os, zfsvfs); 1004 mutex_exit(&zfsvfs->z_os->os_user_ptr_lock); 1005 1006 zfsvfs->z_log = zil_open(zfsvfs->z_os, zfs_get_data); 1007 1008 /* 1009 * If we are not mounting (ie: online recv), then we don't 1010 * have to worry about replaying the log as we blocked all 1011 * operations out since we closed the ZIL. 1012 */ 1013 if (mounting) { 1014 boolean_t readonly; 1015 1016 /* 1017 * During replay we remove the read only flag to 1018 * allow replays to succeed. 1019 */ 1020 readonly = zfsvfs->z_vfs->vfs_flag & VFS_RDONLY; 1021 if (readonly != 0) 1022 zfsvfs->z_vfs->vfs_flag &= ~VFS_RDONLY; 1023 else 1024 zfs_unlinked_drain(zfsvfs); 1025 1026 /* 1027 * Parse and replay the intent log. 1028 * 1029 * Because of ziltest, this must be done after 1030 * zfs_unlinked_drain(). (Further note: ziltest 1031 * doesn't use readonly mounts, where 1032 * zfs_unlinked_drain() isn't called.) This is because 1033 * ziltest causes spa_sync() to think it's committed, 1034 * but actually it is not, so the intent log contains 1035 * many txg's worth of changes. 1036 * 1037 * In particular, if object N is in the unlinked set in 1038 * the last txg to actually sync, then it could be 1039 * actually freed in a later txg and then reallocated 1040 * in a yet later txg. This would write a "create 1041 * object N" record to the intent log. Normally, this 1042 * would be fine because the spa_sync() would have 1043 * written out the fact that object N is free, before 1044 * we could write the "create object N" intent log 1045 * record. 1046 * 1047 * But when we are in ziltest mode, we advance the "open 1048 * txg" without actually spa_sync()-ing the changes to 1049 * disk. So we would see that object N is still 1050 * allocated and in the unlinked set, and there is an 1051 * intent log record saying to allocate it. 1052 */ 1053 if (spa_writeable(dmu_objset_spa(zfsvfs->z_os))) { 1054 if (zil_replay_disable) { 1055 zil_destroy(zfsvfs->z_log, B_FALSE); 1056 } else { 1057 zfsvfs->z_replay = B_TRUE; 1058 zil_replay(zfsvfs->z_os, zfsvfs, 1059 zfs_replay_vector); 1060 zfsvfs->z_replay = B_FALSE; 1061 } 1062 } 1063 zfsvfs->z_vfs->vfs_flag |= readonly; /* restore readonly bit */ 1064 } 1065 1066 return (0); 1067 } 1068 1069 void 1070 zfsvfs_free(zfsvfs_t *zfsvfs) 1071 { 1072 int i; 1073 extern krwlock_t zfsvfs_lock; /* in zfs_znode.c */ 1074 1075 /* 1076 * This is a barrier to prevent the filesystem from going away in 1077 * zfs_znode_move() until we can safely ensure that the filesystem is 1078 * not unmounted. We consider the filesystem valid before the barrier 1079 * and invalid after the barrier. 1080 */ 1081 rw_enter(&zfsvfs_lock, RW_READER); 1082 rw_exit(&zfsvfs_lock); 1083 1084 zfs_fuid_destroy(zfsvfs); 1085 1086 mutex_destroy(&zfsvfs->z_znodes_lock); 1087 mutex_destroy(&zfsvfs->z_lock); 1088 list_destroy(&zfsvfs->z_all_znodes); 1089 rrw_destroy(&zfsvfs->z_teardown_lock); 1090 rw_destroy(&zfsvfs->z_teardown_inactive_lock); 1091 rw_destroy(&zfsvfs->z_fuid_lock); 1092 for (i = 0; i != ZFS_OBJ_MTX_SZ; i++) 1093 mutex_destroy(&zfsvfs->z_hold_mtx[i]); 1094 kmem_free(zfsvfs, sizeof (zfsvfs_t)); 1095 } 1096 1097 static void 1098 zfs_set_fuid_feature(zfsvfs_t *zfsvfs) 1099 { 1100 zfsvfs->z_use_fuids = USE_FUIDS(zfsvfs->z_version, zfsvfs->z_os); 1101 if (zfsvfs->z_vfs) { 1102 if (zfsvfs->z_use_fuids) { 1103 vfs_set_feature(zfsvfs->z_vfs, VFSFT_XVATTR); 1104 vfs_set_feature(zfsvfs->z_vfs, VFSFT_SYSATTR_VIEWS); 1105 vfs_set_feature(zfsvfs->z_vfs, VFSFT_ACEMASKONACCESS); 1106 vfs_set_feature(zfsvfs->z_vfs, VFSFT_ACLONCREATE); 1107 vfs_set_feature(zfsvfs->z_vfs, VFSFT_ACCESS_FILTER); 1108 vfs_set_feature(zfsvfs->z_vfs, VFSFT_REPARSE); 1109 } else { 1110 vfs_clear_feature(zfsvfs->z_vfs, VFSFT_XVATTR); 1111 vfs_clear_feature(zfsvfs->z_vfs, VFSFT_SYSATTR_VIEWS); 1112 vfs_clear_feature(zfsvfs->z_vfs, VFSFT_ACEMASKONACCESS); 1113 vfs_clear_feature(zfsvfs->z_vfs, VFSFT_ACLONCREATE); 1114 vfs_clear_feature(zfsvfs->z_vfs, VFSFT_ACCESS_FILTER); 1115 vfs_clear_feature(zfsvfs->z_vfs, VFSFT_REPARSE); 1116 } 1117 } 1118 zfsvfs->z_use_sa = USE_SA(zfsvfs->z_version, zfsvfs->z_os); 1119 } 1120 1121 static int 1122 zfs_domount(vfs_t *vfsp, char *osname) 1123 { 1124 dev_t mount_dev; 1125 uint64_t recordsize, fsid_guid; 1126 int error = 0; 1127 zfsvfs_t *zfsvfs; 1128 1129 ASSERT(vfsp); 1130 ASSERT(osname); 1131 1132 error = zfsvfs_create(osname, &zfsvfs); 1133 if (error) 1134 return (error); 1135 zfsvfs->z_vfs = vfsp; 1136 1137 /* Initialize the generic filesystem structure. */ 1138 vfsp->vfs_bcount = 0; 1139 vfsp->vfs_data = NULL; 1140 1141 if (zfs_create_unique_device(&mount_dev) == -1) { 1142 error = ENODEV; 1143 goto out; 1144 } 1145 ASSERT(vfs_devismounted(mount_dev) == 0); 1146 1147 if (error = dsl_prop_get_integer(osname, "recordsize", &recordsize, 1148 NULL)) 1149 goto out; 1150 1151 vfsp->vfs_dev = mount_dev; 1152 vfsp->vfs_fstype = zfsfstype; 1153 vfsp->vfs_bsize = recordsize; 1154 vfsp->vfs_flag |= VFS_NOTRUNC; 1155 vfsp->vfs_data = zfsvfs; 1156 1157 /* 1158 * The fsid is 64 bits, composed of an 8-bit fs type, which 1159 * separates our fsid from any other filesystem types, and a 1160 * 56-bit objset unique ID. The objset unique ID is unique to 1161 * all objsets open on this system, provided by unique_create(). 1162 * The 8-bit fs type must be put in the low bits of fsid[1] 1163 * because that's where other Solaris filesystems put it. 1164 */ 1165 fsid_guid = dmu_objset_fsid_guid(zfsvfs->z_os); 1166 ASSERT((fsid_guid & ~((1ULL<<56)-1)) == 0); 1167 vfsp->vfs_fsid.val[0] = fsid_guid; 1168 vfsp->vfs_fsid.val[1] = ((fsid_guid>>32) << 8) | 1169 zfsfstype & 0xFF; 1170 1171 /* 1172 * Set features for file system. 1173 */ 1174 zfs_set_fuid_feature(zfsvfs); 1175 if (zfsvfs->z_case == ZFS_CASE_INSENSITIVE) { 1176 vfs_set_feature(vfsp, VFSFT_DIRENTFLAGS); 1177 vfs_set_feature(vfsp, VFSFT_CASEINSENSITIVE); 1178 vfs_set_feature(vfsp, VFSFT_NOCASESENSITIVE); 1179 } else if (zfsvfs->z_case == ZFS_CASE_MIXED) { 1180 vfs_set_feature(vfsp, VFSFT_DIRENTFLAGS); 1181 vfs_set_feature(vfsp, VFSFT_CASEINSENSITIVE); 1182 } 1183 vfs_set_feature(vfsp, VFSFT_ZEROCOPY_SUPPORTED); 1184 1185 if (dmu_objset_is_snapshot(zfsvfs->z_os)) { 1186 uint64_t pval; 1187 1188 atime_changed_cb(zfsvfs, B_FALSE); 1189 readonly_changed_cb(zfsvfs, B_TRUE); 1190 if (error = dsl_prop_get_integer(osname, "xattr", &pval, NULL)) 1191 goto out; 1192 xattr_changed_cb(zfsvfs, pval); 1193 zfsvfs->z_issnap = B_TRUE; 1194 zfsvfs->z_os->os_sync = ZFS_SYNC_DISABLED; 1195 1196 mutex_enter(&zfsvfs->z_os->os_user_ptr_lock); 1197 dmu_objset_set_user(zfsvfs->z_os, zfsvfs); 1198 mutex_exit(&zfsvfs->z_os->os_user_ptr_lock); 1199 } else { 1200 error = zfsvfs_setup(zfsvfs, B_TRUE); 1201 } 1202 1203 if (!zfsvfs->z_issnap) 1204 zfsctl_create(zfsvfs); 1205 out: 1206 if (error) { 1207 dmu_objset_disown(zfsvfs->z_os, zfsvfs); 1208 zfsvfs_free(zfsvfs); 1209 } else { 1210 atomic_add_32(&zfs_active_fs_count, 1); 1211 } 1212 1213 return (error); 1214 } 1215 1216 void 1217 zfs_unregister_callbacks(zfsvfs_t *zfsvfs) 1218 { 1219 objset_t *os = zfsvfs->z_os; 1220 struct dsl_dataset *ds; 1221 1222 /* 1223 * Unregister properties. 1224 */ 1225 if (!dmu_objset_is_snapshot(os)) { 1226 ds = dmu_objset_ds(os); 1227 VERIFY(dsl_prop_unregister(ds, "atime", atime_changed_cb, 1228 zfsvfs) == 0); 1229 1230 VERIFY(dsl_prop_unregister(ds, "xattr", xattr_changed_cb, 1231 zfsvfs) == 0); 1232 1233 VERIFY(dsl_prop_unregister(ds, "recordsize", blksz_changed_cb, 1234 zfsvfs) == 0); 1235 1236 VERIFY(dsl_prop_unregister(ds, "readonly", readonly_changed_cb, 1237 zfsvfs) == 0); 1238 1239 VERIFY(dsl_prop_unregister(ds, "devices", devices_changed_cb, 1240 zfsvfs) == 0); 1241 1242 VERIFY(dsl_prop_unregister(ds, "setuid", setuid_changed_cb, 1243 zfsvfs) == 0); 1244 1245 VERIFY(dsl_prop_unregister(ds, "exec", exec_changed_cb, 1246 zfsvfs) == 0); 1247 1248 VERIFY(dsl_prop_unregister(ds, "snapdir", snapdir_changed_cb, 1249 zfsvfs) == 0); 1250 1251 VERIFY(dsl_prop_unregister(ds, "aclmode", acl_mode_changed_cb, 1252 zfsvfs) == 0); 1253 1254 VERIFY(dsl_prop_unregister(ds, "aclinherit", 1255 acl_inherit_changed_cb, zfsvfs) == 0); 1256 1257 VERIFY(dsl_prop_unregister(ds, "vscan", 1258 vscan_changed_cb, zfsvfs) == 0); 1259 } 1260 } 1261 1262 /* 1263 * Convert a decimal digit string to a uint64_t integer. 1264 */ 1265 static int 1266 str_to_uint64(char *str, uint64_t *objnum) 1267 { 1268 uint64_t num = 0; 1269 1270 while (*str) { 1271 if (*str < '0' || *str > '9') 1272 return (EINVAL); 1273 1274 num = num*10 + *str++ - '0'; 1275 } 1276 1277 *objnum = num; 1278 return (0); 1279 } 1280 1281 /* 1282 * The boot path passed from the boot loader is in the form of 1283 * "rootpool-name/root-filesystem-object-number'. Convert this 1284 * string to a dataset name: "rootpool-name/root-filesystem-name". 1285 */ 1286 static int 1287 zfs_parse_bootfs(char *bpath, char *outpath) 1288 { 1289 char *slashp; 1290 uint64_t objnum; 1291 int error; 1292 1293 if (*bpath == 0 || *bpath == '/') 1294 return (EINVAL); 1295 1296 (void) strcpy(outpath, bpath); 1297 1298 slashp = strchr(bpath, '/'); 1299 1300 /* if no '/', just return the pool name */ 1301 if (slashp == NULL) { 1302 return (0); 1303 } 1304 1305 /* if not a number, just return the root dataset name */ 1306 if (str_to_uint64(slashp+1, &objnum)) { 1307 return (0); 1308 } 1309 1310 *slashp = '\0'; 1311 error = dsl_dsobj_to_dsname(bpath, objnum, outpath); 1312 *slashp = '/'; 1313 1314 return (error); 1315 } 1316 1317 /* 1318 * zfs_check_global_label: 1319 * Check that the hex label string is appropriate for the dataset 1320 * being mounted into the global_zone proper. 1321 * 1322 * Return an error if the hex label string is not default or 1323 * admin_low/admin_high. For admin_low labels, the corresponding 1324 * dataset must be readonly. 1325 */ 1326 int 1327 zfs_check_global_label(const char *dsname, const char *hexsl) 1328 { 1329 if (strcasecmp(hexsl, ZFS_MLSLABEL_DEFAULT) == 0) 1330 return (0); 1331 if (strcasecmp(hexsl, ADMIN_HIGH) == 0) 1332 return (0); 1333 if (strcasecmp(hexsl, ADMIN_LOW) == 0) { 1334 /* must be readonly */ 1335 uint64_t rdonly; 1336 1337 if (dsl_prop_get_integer(dsname, 1338 zfs_prop_to_name(ZFS_PROP_READONLY), &rdonly, NULL)) 1339 return (EACCES); 1340 return (rdonly ? 0 : EACCES); 1341 } 1342 return (EACCES); 1343 } 1344 1345 /* 1346 * zfs_mount_label_policy: 1347 * Determine whether the mount is allowed according to MAC check. 1348 * by comparing (where appropriate) label of the dataset against 1349 * the label of the zone being mounted into. If the dataset has 1350 * no label, create one. 1351 * 1352 * Returns: 1353 * 0 : access allowed 1354 * >0 : error code, such as EACCES 1355 */ 1356 static int 1357 zfs_mount_label_policy(vfs_t *vfsp, char *osname) 1358 { 1359 int error, retv; 1360 zone_t *mntzone = NULL; 1361 ts_label_t *mnt_tsl; 1362 bslabel_t *mnt_sl; 1363 bslabel_t ds_sl; 1364 char ds_hexsl[MAXNAMELEN]; 1365 1366 retv = EACCES; /* assume the worst */ 1367 1368 /* 1369 * Start by getting the dataset label if it exists. 1370 */ 1371 error = dsl_prop_get(osname, zfs_prop_to_name(ZFS_PROP_MLSLABEL), 1372 1, sizeof (ds_hexsl), &ds_hexsl, NULL); 1373 if (error) 1374 return (EACCES); 1375 1376 /* 1377 * If labeling is NOT enabled, then disallow the mount of datasets 1378 * which have a non-default label already. No other label checks 1379 * are needed. 1380 */ 1381 if (!is_system_labeled()) { 1382 if (strcasecmp(ds_hexsl, ZFS_MLSLABEL_DEFAULT) == 0) 1383 return (0); 1384 return (EACCES); 1385 } 1386 1387 /* 1388 * Get the label of the mountpoint. If mounting into the global 1389 * zone (i.e. mountpoint is not within an active zone and the 1390 * zoned property is off), the label must be default or 1391 * admin_low/admin_high only; no other checks are needed. 1392 */ 1393 mntzone = zone_find_by_any_path(refstr_value(vfsp->vfs_mntpt), B_FALSE); 1394 if (mntzone->zone_id == GLOBAL_ZONEID) { 1395 uint64_t zoned; 1396 1397 zone_rele(mntzone); 1398 1399 if (dsl_prop_get_integer(osname, 1400 zfs_prop_to_name(ZFS_PROP_ZONED), &zoned, NULL)) 1401 return (EACCES); 1402 if (!zoned) 1403 return (zfs_check_global_label(osname, ds_hexsl)); 1404 else 1405 /* 1406 * This is the case of a zone dataset being mounted 1407 * initially, before the zone has been fully created; 1408 * allow this mount into global zone. 1409 */ 1410 return (0); 1411 } 1412 1413 mnt_tsl = mntzone->zone_slabel; 1414 ASSERT(mnt_tsl != NULL); 1415 label_hold(mnt_tsl); 1416 mnt_sl = label2bslabel(mnt_tsl); 1417 1418 if (strcasecmp(ds_hexsl, ZFS_MLSLABEL_DEFAULT) == 0) { 1419 /* 1420 * The dataset doesn't have a real label, so fabricate one. 1421 */ 1422 char *str = NULL; 1423 1424 if (l_to_str_internal(mnt_sl, &str) == 0 && 1425 dsl_prop_set(osname, zfs_prop_to_name(ZFS_PROP_MLSLABEL), 1426 ZPROP_SRC_LOCAL, 1, strlen(str) + 1, str) == 0) 1427 retv = 0; 1428 if (str != NULL) 1429 kmem_free(str, strlen(str) + 1); 1430 } else if (hexstr_to_label(ds_hexsl, &ds_sl) == 0) { 1431 /* 1432 * Now compare labels to complete the MAC check. If the 1433 * labels are equal then allow access. If the mountpoint 1434 * label dominates the dataset label, allow readonly access. 1435 * Otherwise, access is denied. 1436 */ 1437 if (blequal(mnt_sl, &ds_sl)) 1438 retv = 0; 1439 else if (bldominates(mnt_sl, &ds_sl)) { 1440 vfs_setmntopt(vfsp, MNTOPT_RO, NULL, 0); 1441 retv = 0; 1442 } 1443 } 1444 1445 label_rele(mnt_tsl); 1446 zone_rele(mntzone); 1447 return (retv); 1448 } 1449 1450 static int 1451 zfs_mountroot(vfs_t *vfsp, enum whymountroot why) 1452 { 1453 int error = 0; 1454 static int zfsrootdone = 0; 1455 zfsvfs_t *zfsvfs = NULL; 1456 znode_t *zp = NULL; 1457 vnode_t *vp = NULL; 1458 char *zfs_bootfs; 1459 char *zfs_devid; 1460 1461 ASSERT(vfsp); 1462 1463 /* 1464 * The filesystem that we mount as root is defined in the 1465 * boot property "zfs-bootfs" with a format of 1466 * "poolname/root-dataset-objnum". 1467 */ 1468 if (why == ROOT_INIT) { 1469 if (zfsrootdone++) 1470 return (EBUSY); 1471 /* 1472 * the process of doing a spa_load will require the 1473 * clock to be set before we could (for example) do 1474 * something better by looking at the timestamp on 1475 * an uberblock, so just set it to -1. 1476 */ 1477 clkset(-1); 1478 1479 if ((zfs_bootfs = spa_get_bootprop("zfs-bootfs")) == NULL) { 1480 cmn_err(CE_NOTE, "spa_get_bootfs: can not get " 1481 "bootfs name"); 1482 return (EINVAL); 1483 } 1484 zfs_devid = spa_get_bootprop("diskdevid"); 1485 error = spa_import_rootpool(rootfs.bo_name, zfs_devid); 1486 if (zfs_devid) 1487 spa_free_bootprop(zfs_devid); 1488 if (error) { 1489 spa_free_bootprop(zfs_bootfs); 1490 cmn_err(CE_NOTE, "spa_import_rootpool: error %d", 1491 error); 1492 return (error); 1493 } 1494 if (error = zfs_parse_bootfs(zfs_bootfs, rootfs.bo_name)) { 1495 spa_free_bootprop(zfs_bootfs); 1496 cmn_err(CE_NOTE, "zfs_parse_bootfs: error %d", 1497 error); 1498 return (error); 1499 } 1500 1501 spa_free_bootprop(zfs_bootfs); 1502 1503 if (error = vfs_lock(vfsp)) 1504 return (error); 1505 1506 if (error = zfs_domount(vfsp, rootfs.bo_name)) { 1507 cmn_err(CE_NOTE, "zfs_domount: error %d", error); 1508 goto out; 1509 } 1510 1511 zfsvfs = (zfsvfs_t *)vfsp->vfs_data; 1512 ASSERT(zfsvfs); 1513 if (error = zfs_zget(zfsvfs, zfsvfs->z_root, &zp)) { 1514 cmn_err(CE_NOTE, "zfs_zget: error %d", error); 1515 goto out; 1516 } 1517 1518 vp = ZTOV(zp); 1519 mutex_enter(&vp->v_lock); 1520 vp->v_flag |= VROOT; 1521 mutex_exit(&vp->v_lock); 1522 rootvp = vp; 1523 1524 /* 1525 * Leave rootvp held. The root file system is never unmounted. 1526 */ 1527 1528 vfs_add((struct vnode *)0, vfsp, 1529 (vfsp->vfs_flag & VFS_RDONLY) ? MS_RDONLY : 0); 1530 out: 1531 vfs_unlock(vfsp); 1532 return (error); 1533 } else if (why == ROOT_REMOUNT) { 1534 readonly_changed_cb(vfsp->vfs_data, B_FALSE); 1535 vfsp->vfs_flag |= VFS_REMOUNT; 1536 1537 /* refresh mount options */ 1538 zfs_unregister_callbacks(vfsp->vfs_data); 1539 return (zfs_register_callbacks(vfsp)); 1540 1541 } else if (why == ROOT_UNMOUNT) { 1542 zfs_unregister_callbacks((zfsvfs_t *)vfsp->vfs_data); 1543 (void) zfs_sync(vfsp, 0, 0); 1544 return (0); 1545 } 1546 1547 /* 1548 * if "why" is equal to anything else other than ROOT_INIT, 1549 * ROOT_REMOUNT, or ROOT_UNMOUNT, we do not support it. 1550 */ 1551 return (ENOTSUP); 1552 } 1553 1554 /*ARGSUSED*/ 1555 static int 1556 zfs_mount(vfs_t *vfsp, vnode_t *mvp, struct mounta *uap, cred_t *cr) 1557 { 1558 char *osname; 1559 pathname_t spn; 1560 int error = 0; 1561 uio_seg_t fromspace = (uap->flags & MS_SYSSPACE) ? 1562 UIO_SYSSPACE : UIO_USERSPACE; 1563 int canwrite; 1564 1565 if (mvp->v_type != VDIR) 1566 return (ENOTDIR); 1567 1568 mutex_enter(&mvp->v_lock); 1569 if ((uap->flags & MS_REMOUNT) == 0 && 1570 (uap->flags & MS_OVERLAY) == 0 && 1571 (mvp->v_count != 1 || (mvp->v_flag & VROOT))) { 1572 mutex_exit(&mvp->v_lock); 1573 return (EBUSY); 1574 } 1575 mutex_exit(&mvp->v_lock); 1576 1577 /* 1578 * ZFS does not support passing unparsed data in via MS_DATA. 1579 * Users should use the MS_OPTIONSTR interface; this means 1580 * that all option parsing is already done and the options struct 1581 * can be interrogated. 1582 */ 1583 if ((uap->flags & MS_DATA) && uap->datalen > 0) 1584 return (EINVAL); 1585 1586 /* 1587 * Get the objset name (the "special" mount argument). 1588 */ 1589 if (error = pn_get(uap->spec, fromspace, &spn)) 1590 return (error); 1591 1592 osname = spn.pn_path; 1593 1594 /* 1595 * Check for mount privilege? 1596 * 1597 * If we don't have privilege then see if 1598 * we have local permission to allow it 1599 */ 1600 error = secpolicy_fs_mount(cr, mvp, vfsp); 1601 if (error) { 1602 if (dsl_deleg_access(osname, ZFS_DELEG_PERM_MOUNT, cr) == 0) { 1603 vattr_t vattr; 1604 1605 /* 1606 * Make sure user is the owner of the mount point 1607 * or has sufficient privileges. 1608 */ 1609 1610 vattr.va_mask = AT_UID; 1611 1612 if (VOP_GETATTR(mvp, &vattr, 0, cr, NULL)) { 1613 goto out; 1614 } 1615 1616 if (secpolicy_vnode_owner(cr, vattr.va_uid) != 0 && 1617 VOP_ACCESS(mvp, VWRITE, 0, cr, NULL) != 0) { 1618 goto out; 1619 } 1620 secpolicy_fs_mount_clearopts(cr, vfsp); 1621 } else { 1622 goto out; 1623 } 1624 } 1625 1626 /* 1627 * Refuse to mount a filesystem if we are in a local zone and the 1628 * dataset is not visible. 1629 */ 1630 if (!INGLOBALZONE(curproc) && 1631 (!zone_dataset_visible(osname, &canwrite) || !canwrite)) { 1632 error = EPERM; 1633 goto out; 1634 } 1635 1636 error = zfs_mount_label_policy(vfsp, osname); 1637 if (error) 1638 goto out; 1639 1640 /* 1641 * When doing a remount, we simply refresh our temporary properties 1642 * according to those options set in the current VFS options. 1643 */ 1644 if (uap->flags & MS_REMOUNT) { 1645 /* refresh mount options */ 1646 zfs_unregister_callbacks(vfsp->vfs_data); 1647 error = zfs_register_callbacks(vfsp); 1648 goto out; 1649 } 1650 1651 error = zfs_domount(vfsp, osname); 1652 1653 /* 1654 * Add an extra VFS_HOLD on our parent vfs so that it can't 1655 * disappear due to a forced unmount. 1656 */ 1657 if (error == 0 && ((zfsvfs_t *)vfsp->vfs_data)->z_issnap) 1658 VFS_HOLD(mvp->v_vfsp); 1659 1660 out: 1661 pn_free(&spn); 1662 return (error); 1663 } 1664 1665 static int 1666 zfs_statvfs(vfs_t *vfsp, struct statvfs64 *statp) 1667 { 1668 zfsvfs_t *zfsvfs = vfsp->vfs_data; 1669 dev32_t d32; 1670 uint64_t refdbytes, availbytes, usedobjs, availobjs; 1671 1672 ZFS_ENTER(zfsvfs); 1673 1674 dmu_objset_space(zfsvfs->z_os, 1675 &refdbytes, &availbytes, &usedobjs, &availobjs); 1676 1677 /* 1678 * The underlying storage pool actually uses multiple block sizes. 1679 * We report the fragsize as the smallest block size we support, 1680 * and we report our blocksize as the filesystem's maximum blocksize. 1681 */ 1682 statp->f_frsize = 1UL << SPA_MINBLOCKSHIFT; 1683 statp->f_bsize = zfsvfs->z_max_blksz; 1684 1685 /* 1686 * The following report "total" blocks of various kinds in the 1687 * file system, but reported in terms of f_frsize - the 1688 * "fragment" size. 1689 */ 1690 1691 statp->f_blocks = (refdbytes + availbytes) >> SPA_MINBLOCKSHIFT; 1692 statp->f_bfree = availbytes >> SPA_MINBLOCKSHIFT; 1693 statp->f_bavail = statp->f_bfree; /* no root reservation */ 1694 1695 /* 1696 * statvfs() should really be called statufs(), because it assumes 1697 * static metadata. ZFS doesn't preallocate files, so the best 1698 * we can do is report the max that could possibly fit in f_files, 1699 * and that minus the number actually used in f_ffree. 1700 * For f_ffree, report the smaller of the number of object available 1701 * and the number of blocks (each object will take at least a block). 1702 */ 1703 statp->f_ffree = MIN(availobjs, statp->f_bfree); 1704 statp->f_favail = statp->f_ffree; /* no "root reservation" */ 1705 statp->f_files = statp->f_ffree + usedobjs; 1706 1707 (void) cmpldev(&d32, vfsp->vfs_dev); 1708 statp->f_fsid = d32; 1709 1710 /* 1711 * We're a zfs filesystem. 1712 */ 1713 (void) strcpy(statp->f_basetype, vfssw[vfsp->vfs_fstype].vsw_name); 1714 1715 statp->f_flag = vf_to_stf(vfsp->vfs_flag); 1716 1717 statp->f_namemax = ZFS_MAXNAMELEN; 1718 1719 /* 1720 * We have all of 32 characters to stuff a string here. 1721 * Is there anything useful we could/should provide? 1722 */ 1723 bzero(statp->f_fstr, sizeof (statp->f_fstr)); 1724 1725 ZFS_EXIT(zfsvfs); 1726 return (0); 1727 } 1728 1729 static int 1730 zfs_root(vfs_t *vfsp, vnode_t **vpp) 1731 { 1732 zfsvfs_t *zfsvfs = vfsp->vfs_data; 1733 znode_t *rootzp; 1734 int error; 1735 1736 ZFS_ENTER(zfsvfs); 1737 1738 error = zfs_zget(zfsvfs, zfsvfs->z_root, &rootzp); 1739 if (error == 0) 1740 *vpp = ZTOV(rootzp); 1741 1742 ZFS_EXIT(zfsvfs); 1743 return (error); 1744 } 1745 1746 /* 1747 * Teardown the zfsvfs::z_os. 1748 * 1749 * Note, if 'unmounting' if FALSE, we return with the 'z_teardown_lock' 1750 * and 'z_teardown_inactive_lock' held. 1751 */ 1752 static int 1753 zfsvfs_teardown(zfsvfs_t *zfsvfs, boolean_t unmounting) 1754 { 1755 znode_t *zp; 1756 1757 rrw_enter(&zfsvfs->z_teardown_lock, RW_WRITER, FTAG); 1758 1759 if (!unmounting) { 1760 /* 1761 * We purge the parent filesystem's vfsp as the parent 1762 * filesystem and all of its snapshots have their vnode's 1763 * v_vfsp set to the parent's filesystem's vfsp. Note, 1764 * 'z_parent' is self referential for non-snapshots. 1765 */ 1766 (void) dnlc_purge_vfsp(zfsvfs->z_parent->z_vfs, 0); 1767 } 1768 1769 /* 1770 * Close the zil. NB: Can't close the zil while zfs_inactive 1771 * threads are blocked as zil_close can call zfs_inactive. 1772 */ 1773 if (zfsvfs->z_log) { 1774 zil_close(zfsvfs->z_log); 1775 zfsvfs->z_log = NULL; 1776 } 1777 1778 rw_enter(&zfsvfs->z_teardown_inactive_lock, RW_WRITER); 1779 1780 /* 1781 * If we are not unmounting (ie: online recv) and someone already 1782 * unmounted this file system while we were doing the switcheroo, 1783 * or a reopen of z_os failed then just bail out now. 1784 */ 1785 if (!unmounting && (zfsvfs->z_unmounted || zfsvfs->z_os == NULL)) { 1786 rw_exit(&zfsvfs->z_teardown_inactive_lock); 1787 rrw_exit(&zfsvfs->z_teardown_lock, FTAG); 1788 return (EIO); 1789 } 1790 1791 /* 1792 * At this point there are no vops active, and any new vops will 1793 * fail with EIO since we have z_teardown_lock for writer (only 1794 * relavent for forced unmount). 1795 * 1796 * Release all holds on dbufs. 1797 */ 1798 mutex_enter(&zfsvfs->z_znodes_lock); 1799 for (zp = list_head(&zfsvfs->z_all_znodes); zp != NULL; 1800 zp = list_next(&zfsvfs->z_all_znodes, zp)) 1801 if (zp->z_sa_hdl) { 1802 ASSERT(ZTOV(zp)->v_count > 0); 1803 zfs_znode_dmu_fini(zp); 1804 } 1805 mutex_exit(&zfsvfs->z_znodes_lock); 1806 1807 /* 1808 * If we are unmounting, set the unmounted flag and let new vops 1809 * unblock. zfs_inactive will have the unmounted behavior, and all 1810 * other vops will fail with EIO. 1811 */ 1812 if (unmounting) { 1813 zfsvfs->z_unmounted = B_TRUE; 1814 rrw_exit(&zfsvfs->z_teardown_lock, FTAG); 1815 rw_exit(&zfsvfs->z_teardown_inactive_lock); 1816 } 1817 1818 /* 1819 * z_os will be NULL if there was an error in attempting to reopen 1820 * zfsvfs, so just return as the properties had already been 1821 * unregistered and cached data had been evicted before. 1822 */ 1823 if (zfsvfs->z_os == NULL) 1824 return (0); 1825 1826 /* 1827 * Unregister properties. 1828 */ 1829 zfs_unregister_callbacks(zfsvfs); 1830 1831 /* 1832 * Evict cached data 1833 */ 1834 if (dmu_objset_is_dirty_anywhere(zfsvfs->z_os)) 1835 if (!(zfsvfs->z_vfs->vfs_flag & VFS_RDONLY)) 1836 txg_wait_synced(dmu_objset_pool(zfsvfs->z_os), 0); 1837 (void) dmu_objset_evict_dbufs(zfsvfs->z_os); 1838 1839 return (0); 1840 } 1841 1842 /*ARGSUSED*/ 1843 static int 1844 zfs_umount(vfs_t *vfsp, int fflag, cred_t *cr) 1845 { 1846 zfsvfs_t *zfsvfs = vfsp->vfs_data; 1847 objset_t *os; 1848 int ret; 1849 1850 ret = secpolicy_fs_unmount(cr, vfsp); 1851 if (ret) { 1852 if (dsl_deleg_access((char *)refstr_value(vfsp->vfs_resource), 1853 ZFS_DELEG_PERM_MOUNT, cr)) 1854 return (ret); 1855 } 1856 1857 /* 1858 * We purge the parent filesystem's vfsp as the parent filesystem 1859 * and all of its snapshots have their vnode's v_vfsp set to the 1860 * parent's filesystem's vfsp. Note, 'z_parent' is self 1861 * referential for non-snapshots. 1862 */ 1863 (void) dnlc_purge_vfsp(zfsvfs->z_parent->z_vfs, 0); 1864 1865 /* 1866 * Unmount any snapshots mounted under .zfs before unmounting the 1867 * dataset itself. 1868 */ 1869 if (zfsvfs->z_ctldir != NULL && 1870 (ret = zfsctl_umount_snapshots(vfsp, fflag, cr)) != 0) { 1871 return (ret); 1872 } 1873 1874 if (!(fflag & MS_FORCE)) { 1875 /* 1876 * Check the number of active vnodes in the file system. 1877 * Our count is maintained in the vfs structure, but the 1878 * number is off by 1 to indicate a hold on the vfs 1879 * structure itself. 1880 * 1881 * The '.zfs' directory maintains a reference of its 1882 * own, and any active references underneath are 1883 * reflected in the vnode count. 1884 */ 1885 if (zfsvfs->z_ctldir == NULL) { 1886 if (vfsp->vfs_count > 1) 1887 return (EBUSY); 1888 } else { 1889 if (vfsp->vfs_count > 2 || 1890 zfsvfs->z_ctldir->v_count > 1) 1891 return (EBUSY); 1892 } 1893 } 1894 1895 vfsp->vfs_flag |= VFS_UNMOUNTED; 1896 1897 VERIFY(zfsvfs_teardown(zfsvfs, B_TRUE) == 0); 1898 os = zfsvfs->z_os; 1899 1900 /* 1901 * z_os will be NULL if there was an error in 1902 * attempting to reopen zfsvfs. 1903 */ 1904 if (os != NULL) { 1905 /* 1906 * Unset the objset user_ptr. 1907 */ 1908 mutex_enter(&os->os_user_ptr_lock); 1909 dmu_objset_set_user(os, NULL); 1910 mutex_exit(&os->os_user_ptr_lock); 1911 1912 /* 1913 * Finally release the objset 1914 */ 1915 dmu_objset_disown(os, zfsvfs); 1916 } 1917 1918 /* 1919 * We can now safely destroy the '.zfs' directory node. 1920 */ 1921 if (zfsvfs->z_ctldir != NULL) 1922 zfsctl_destroy(zfsvfs); 1923 1924 return (0); 1925 } 1926 1927 static int 1928 zfs_vget(vfs_t *vfsp, vnode_t **vpp, fid_t *fidp) 1929 { 1930 zfsvfs_t *zfsvfs = vfsp->vfs_data; 1931 znode_t *zp; 1932 uint64_t object = 0; 1933 uint64_t fid_gen = 0; 1934 uint64_t gen_mask; 1935 uint64_t zp_gen; 1936 int i, err; 1937 1938 *vpp = NULL; 1939 1940 ZFS_ENTER(zfsvfs); 1941 1942 if (fidp->fid_len == LONG_FID_LEN) { 1943 zfid_long_t *zlfid = (zfid_long_t *)fidp; 1944 uint64_t objsetid = 0; 1945 uint64_t setgen = 0; 1946 1947 for (i = 0; i < sizeof (zlfid->zf_setid); i++) 1948 objsetid |= ((uint64_t)zlfid->zf_setid[i]) << (8 * i); 1949 1950 for (i = 0; i < sizeof (zlfid->zf_setgen); i++) 1951 setgen |= ((uint64_t)zlfid->zf_setgen[i]) << (8 * i); 1952 1953 ZFS_EXIT(zfsvfs); 1954 1955 err = zfsctl_lookup_objset(vfsp, objsetid, &zfsvfs); 1956 if (err) 1957 return (EINVAL); 1958 ZFS_ENTER(zfsvfs); 1959 } 1960 1961 if (fidp->fid_len == SHORT_FID_LEN || fidp->fid_len == LONG_FID_LEN) { 1962 zfid_short_t *zfid = (zfid_short_t *)fidp; 1963 1964 for (i = 0; i < sizeof (zfid->zf_object); i++) 1965 object |= ((uint64_t)zfid->zf_object[i]) << (8 * i); 1966 1967 for (i = 0; i < sizeof (zfid->zf_gen); i++) 1968 fid_gen |= ((uint64_t)zfid->zf_gen[i]) << (8 * i); 1969 } else { 1970 ZFS_EXIT(zfsvfs); 1971 return (EINVAL); 1972 } 1973 1974 /* A zero fid_gen means we are in the .zfs control directories */ 1975 if (fid_gen == 0 && 1976 (object == ZFSCTL_INO_ROOT || object == ZFSCTL_INO_SNAPDIR)) { 1977 *vpp = zfsvfs->z_ctldir; 1978 ASSERT(*vpp != NULL); 1979 if (object == ZFSCTL_INO_SNAPDIR) { 1980 VERIFY(zfsctl_root_lookup(*vpp, "snapshot", vpp, NULL, 1981 0, NULL, NULL, NULL, NULL, NULL) == 0); 1982 } else { 1983 VN_HOLD(*vpp); 1984 } 1985 ZFS_EXIT(zfsvfs); 1986 return (0); 1987 } 1988 1989 gen_mask = -1ULL >> (64 - 8 * i); 1990 1991 dprintf("getting %llu [%u mask %llx]\n", object, fid_gen, gen_mask); 1992 if (err = zfs_zget(zfsvfs, object, &zp)) { 1993 ZFS_EXIT(zfsvfs); 1994 return (err); 1995 } 1996 (void) sa_lookup(zp->z_sa_hdl, SA_ZPL_GEN(zfsvfs), &zp_gen, 1997 sizeof (uint64_t)); 1998 zp_gen = zp_gen & gen_mask; 1999 if (zp_gen == 0) 2000 zp_gen = 1; 2001 if (zp->z_unlinked || zp_gen != fid_gen) { 2002 dprintf("znode gen (%u) != fid gen (%u)\n", zp_gen, fid_gen); 2003 VN_RELE(ZTOV(zp)); 2004 ZFS_EXIT(zfsvfs); 2005 return (EINVAL); 2006 } 2007 2008 *vpp = ZTOV(zp); 2009 ZFS_EXIT(zfsvfs); 2010 return (0); 2011 } 2012 2013 /* 2014 * Block out VOPs and close zfsvfs_t::z_os 2015 * 2016 * Note, if successful, then we return with the 'z_teardown_lock' and 2017 * 'z_teardown_inactive_lock' write held. 2018 */ 2019 int 2020 zfs_suspend_fs(zfsvfs_t *zfsvfs) 2021 { 2022 int error; 2023 2024 if ((error = zfsvfs_teardown(zfsvfs, B_FALSE)) != 0) 2025 return (error); 2026 dmu_objset_disown(zfsvfs->z_os, zfsvfs); 2027 2028 return (0); 2029 } 2030 2031 /* 2032 * Reopen zfsvfs_t::z_os and release VOPs. 2033 */ 2034 int 2035 zfs_resume_fs(zfsvfs_t *zfsvfs, const char *osname) 2036 { 2037 int err; 2038 2039 ASSERT(RRW_WRITE_HELD(&zfsvfs->z_teardown_lock)); 2040 ASSERT(RW_WRITE_HELD(&zfsvfs->z_teardown_inactive_lock)); 2041 2042 err = dmu_objset_own(osname, DMU_OST_ZFS, B_FALSE, zfsvfs, 2043 &zfsvfs->z_os); 2044 if (err) { 2045 zfsvfs->z_os = NULL; 2046 } else { 2047 znode_t *zp; 2048 uint64_t sa_obj = 0; 2049 2050 /* 2051 * Make sure version hasn't changed 2052 */ 2053 2054 err = zfs_get_zplprop(zfsvfs->z_os, ZFS_PROP_VERSION, 2055 &zfsvfs->z_version); 2056 2057 if (err) 2058 goto bail; 2059 2060 err = zap_lookup(zfsvfs->z_os, MASTER_NODE_OBJ, 2061 ZFS_SA_ATTRS, 8, 1, &sa_obj); 2062 2063 if (err && zfsvfs->z_version >= ZPL_VERSION_SA) 2064 goto bail; 2065 2066 if ((err = sa_setup(zfsvfs->z_os, sa_obj, 2067 zfs_attr_table, ZPL_END, &zfsvfs->z_attr_table)) != 0) 2068 goto bail; 2069 2070 if (zfsvfs->z_version >= ZPL_VERSION_SA) 2071 sa_register_update_callback(zfsvfs->z_os, 2072 zfs_sa_upgrade); 2073 2074 VERIFY(zfsvfs_setup(zfsvfs, B_FALSE) == 0); 2075 2076 zfs_set_fuid_feature(zfsvfs); 2077 2078 /* 2079 * Attempt to re-establish all the active znodes with 2080 * their dbufs. If a zfs_rezget() fails, then we'll let 2081 * any potential callers discover that via ZFS_ENTER_VERIFY_VP 2082 * when they try to use their znode. 2083 */ 2084 mutex_enter(&zfsvfs->z_znodes_lock); 2085 for (zp = list_head(&zfsvfs->z_all_znodes); zp; 2086 zp = list_next(&zfsvfs->z_all_znodes, zp)) { 2087 (void) zfs_rezget(zp); 2088 } 2089 mutex_exit(&zfsvfs->z_znodes_lock); 2090 } 2091 2092 bail: 2093 /* release the VOPs */ 2094 rw_exit(&zfsvfs->z_teardown_inactive_lock); 2095 rrw_exit(&zfsvfs->z_teardown_lock, FTAG); 2096 2097 if (err) { 2098 /* 2099 * Since we couldn't reopen zfsvfs::z_os, or 2100 * setup the sa framework force unmount this file system. 2101 */ 2102 if (vn_vfswlock(zfsvfs->z_vfs->vfs_vnodecovered) == 0) 2103 (void) dounmount(zfsvfs->z_vfs, MS_FORCE, CRED()); 2104 } 2105 return (err); 2106 } 2107 2108 static void 2109 zfs_freevfs(vfs_t *vfsp) 2110 { 2111 zfsvfs_t *zfsvfs = vfsp->vfs_data; 2112 2113 /* 2114 * If this is a snapshot, we have an extra VFS_HOLD on our parent 2115 * from zfs_mount(). Release it here. If we came through 2116 * zfs_mountroot() instead, we didn't grab an extra hold, so 2117 * skip the VFS_RELE for rootvfs. 2118 */ 2119 if (zfsvfs->z_issnap && (vfsp != rootvfs)) 2120 VFS_RELE(zfsvfs->z_parent->z_vfs); 2121 2122 zfsvfs_free(zfsvfs); 2123 2124 atomic_add_32(&zfs_active_fs_count, -1); 2125 } 2126 2127 /* 2128 * VFS_INIT() initialization. Note that there is no VFS_FINI(), 2129 * so we can't safely do any non-idempotent initialization here. 2130 * Leave that to zfs_init() and zfs_fini(), which are called 2131 * from the module's _init() and _fini() entry points. 2132 */ 2133 /*ARGSUSED*/ 2134 static int 2135 zfs_vfsinit(int fstype, char *name) 2136 { 2137 int error; 2138 2139 zfsfstype = fstype; 2140 2141 /* 2142 * Setup vfsops and vnodeops tables. 2143 */ 2144 error = vfs_setfsops(fstype, zfs_vfsops_template, &zfs_vfsops); 2145 if (error != 0) { 2146 cmn_err(CE_WARN, "zfs: bad vfs ops template"); 2147 } 2148 2149 error = zfs_create_op_tables(); 2150 if (error) { 2151 zfs_remove_op_tables(); 2152 cmn_err(CE_WARN, "zfs: bad vnode ops template"); 2153 (void) vfs_freevfsops_by_type(zfsfstype); 2154 return (error); 2155 } 2156 2157 mutex_init(&zfs_dev_mtx, NULL, MUTEX_DEFAULT, NULL); 2158 2159 /* 2160 * Unique major number for all zfs mounts. 2161 * If we run out of 32-bit minors, we'll getudev() another major. 2162 */ 2163 zfs_major = ddi_name_to_major(ZFS_DRIVER); 2164 zfs_minor = ZFS_MIN_MINOR; 2165 2166 return (0); 2167 } 2168 2169 void 2170 zfs_init(void) 2171 { 2172 /* 2173 * Initialize .zfs directory structures 2174 */ 2175 zfsctl_init(); 2176 2177 /* 2178 * Initialize znode cache, vnode ops, etc... 2179 */ 2180 zfs_znode_init(); 2181 2182 dmu_objset_register_type(DMU_OST_ZFS, zfs_space_delta_cb); 2183 } 2184 2185 void 2186 zfs_fini(void) 2187 { 2188 zfsctl_fini(); 2189 zfs_znode_fini(); 2190 } 2191 2192 int 2193 zfs_busy(void) 2194 { 2195 return (zfs_active_fs_count != 0); 2196 } 2197 2198 int 2199 zfs_set_version(zfsvfs_t *zfsvfs, uint64_t newvers) 2200 { 2201 int error; 2202 objset_t *os = zfsvfs->z_os; 2203 dmu_tx_t *tx; 2204 2205 if (newvers < ZPL_VERSION_INITIAL || newvers > ZPL_VERSION) 2206 return (EINVAL); 2207 2208 if (newvers < zfsvfs->z_version) 2209 return (EINVAL); 2210 2211 if (zfs_spa_version_map(newvers) > 2212 spa_version(dmu_objset_spa(zfsvfs->z_os))) 2213 return (ENOTSUP); 2214 2215 tx = dmu_tx_create(os); 2216 dmu_tx_hold_zap(tx, MASTER_NODE_OBJ, B_FALSE, ZPL_VERSION_STR); 2217 if (newvers >= ZPL_VERSION_SA && !zfsvfs->z_use_sa) { 2218 dmu_tx_hold_zap(tx, MASTER_NODE_OBJ, B_TRUE, 2219 ZFS_SA_ATTRS); 2220 dmu_tx_hold_zap(tx, DMU_NEW_OBJECT, FALSE, NULL); 2221 } 2222 error = dmu_tx_assign(tx, TXG_WAIT); 2223 if (error) { 2224 dmu_tx_abort(tx); 2225 return (error); 2226 } 2227 2228 error = zap_update(os, MASTER_NODE_OBJ, ZPL_VERSION_STR, 2229 8, 1, &newvers, tx); 2230 2231 if (error) { 2232 dmu_tx_commit(tx); 2233 return (error); 2234 } 2235 2236 if (newvers >= ZPL_VERSION_SA && !zfsvfs->z_use_sa) { 2237 uint64_t sa_obj; 2238 2239 ASSERT3U(spa_version(dmu_objset_spa(zfsvfs->z_os)), >=, 2240 SPA_VERSION_SA); 2241 sa_obj = zap_create(os, DMU_OT_SA_MASTER_NODE, 2242 DMU_OT_NONE, 0, tx); 2243 2244 error = zap_add(os, MASTER_NODE_OBJ, 2245 ZFS_SA_ATTRS, 8, 1, &sa_obj, tx); 2246 ASSERT3U(error, ==, 0); 2247 2248 VERIFY(0 == sa_set_sa_object(os, sa_obj)); 2249 sa_register_update_callback(os, zfs_sa_upgrade); 2250 } 2251 2252 spa_history_log_internal_ds(dmu_objset_ds(os), "upgrade", tx, 2253 "from %llu to %llu", zfsvfs->z_version, newvers); 2254 2255 dmu_tx_commit(tx); 2256 2257 zfsvfs->z_version = newvers; 2258 2259 zfs_set_fuid_feature(zfsvfs); 2260 2261 return (0); 2262 } 2263 2264 /* 2265 * Read a property stored within the master node. 2266 */ 2267 int 2268 zfs_get_zplprop(objset_t *os, zfs_prop_t prop, uint64_t *value) 2269 { 2270 const char *pname; 2271 int error = ENOENT; 2272 2273 /* 2274 * Look up the file system's value for the property. For the 2275 * version property, we look up a slightly different string. 2276 */ 2277 if (prop == ZFS_PROP_VERSION) 2278 pname = ZPL_VERSION_STR; 2279 else 2280 pname = zfs_prop_to_name(prop); 2281 2282 if (os != NULL) 2283 error = zap_lookup(os, MASTER_NODE_OBJ, pname, 8, 1, value); 2284 2285 if (error == ENOENT) { 2286 /* No value set, use the default value */ 2287 switch (prop) { 2288 case ZFS_PROP_VERSION: 2289 *value = ZPL_VERSION; 2290 break; 2291 case ZFS_PROP_NORMALIZE: 2292 case ZFS_PROP_UTF8ONLY: 2293 *value = 0; 2294 break; 2295 case ZFS_PROP_CASE: 2296 *value = ZFS_CASE_SENSITIVE; 2297 break; 2298 default: 2299 return (error); 2300 } 2301 error = 0; 2302 } 2303 return (error); 2304 } 2305 2306 static vfsdef_t vfw = { 2307 VFSDEF_VERSION, 2308 MNTTYPE_ZFS, 2309 zfs_vfsinit, 2310 VSW_HASPROTO|VSW_CANRWRO|VSW_CANREMOUNT|VSW_VOLATILEDEV|VSW_STATS| 2311 VSW_XID|VSW_ZMOUNT, 2312 &zfs_mntopts 2313 }; 2314 2315 struct modlfs zfs_modlfs = { 2316 &mod_fsops, "ZFS filesystem version " SPA_VERSION_STRING, &vfw 2317 };