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 https://opensource.org/licenses/CDDL-1.0. 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, 2018 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/sysmacros.h> 31 #include <sys/kmem.h> 32 #include <sys/pathname.h> 33 #include <sys/vnode.h> 34 #include <sys/vfs.h> 35 #include <sys/mntent.h> 36 #include <sys/cmn_err.h> 37 #include <sys/zfs_znode.h> 38 #include <sys/zfs_vnops.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/sa.h> 49 #include <sys/sa_impl.h> 50 #include <sys/policy.h> 51 #include <sys/atomic.h> 52 #include <sys/zfs_ioctl.h> 53 #include <sys/zfs_ctldir.h> 54 #include <sys/zfs_fuid.h> 55 #include <sys/zfs_quota.h> 56 #include <sys/sunddi.h> 57 #include <sys/dmu_objset.h> 58 #include <sys/dsl_dir.h> 59 #include <sys/objlist.h> 60 #include <sys/zpl.h> 61 #include <linux/vfs_compat.h> 62 #include "zfs_comutil.h" 63 64 enum { 65 TOKEN_RO, 66 TOKEN_RW, 67 TOKEN_SETUID, 68 TOKEN_NOSETUID, 69 TOKEN_EXEC, 70 TOKEN_NOEXEC, 71 TOKEN_DEVICES, 72 TOKEN_NODEVICES, 73 TOKEN_DIRXATTR, 74 TOKEN_SAXATTR, 75 TOKEN_XATTR, 76 TOKEN_NOXATTR, 77 TOKEN_ATIME, 78 TOKEN_NOATIME, 79 TOKEN_RELATIME, 80 TOKEN_NORELATIME, 81 TOKEN_NBMAND, 82 TOKEN_NONBMAND, 83 TOKEN_MNTPOINT, 84 TOKEN_LAST, 85 }; 86 87 static const match_table_t zpl_tokens = { 88 { TOKEN_RO, MNTOPT_RO }, 89 { TOKEN_RW, MNTOPT_RW }, 90 { TOKEN_SETUID, MNTOPT_SETUID }, 91 { TOKEN_NOSETUID, MNTOPT_NOSETUID }, 92 { TOKEN_EXEC, MNTOPT_EXEC }, 93 { TOKEN_NOEXEC, MNTOPT_NOEXEC }, 94 { TOKEN_DEVICES, MNTOPT_DEVICES }, 95 { TOKEN_NODEVICES, MNTOPT_NODEVICES }, 96 { TOKEN_DIRXATTR, MNTOPT_DIRXATTR }, 97 { TOKEN_SAXATTR, MNTOPT_SAXATTR }, 98 { TOKEN_XATTR, MNTOPT_XATTR }, 99 { TOKEN_NOXATTR, MNTOPT_NOXATTR }, 100 { TOKEN_ATIME, MNTOPT_ATIME }, 101 { TOKEN_NOATIME, MNTOPT_NOATIME }, 102 { TOKEN_RELATIME, MNTOPT_RELATIME }, 103 { TOKEN_NORELATIME, MNTOPT_NORELATIME }, 104 { TOKEN_NBMAND, MNTOPT_NBMAND }, 105 { TOKEN_NONBMAND, MNTOPT_NONBMAND }, 106 { TOKEN_MNTPOINT, MNTOPT_MNTPOINT "=%s" }, 107 { TOKEN_LAST, NULL }, 108 }; 109 110 static void 111 zfsvfs_vfs_free(vfs_t *vfsp) 112 { 113 if (vfsp != NULL) { 114 if (vfsp->vfs_mntpoint != NULL) 115 kmem_strfree(vfsp->vfs_mntpoint); 116 117 kmem_free(vfsp, sizeof (vfs_t)); 118 } 119 } 120 121 static int 122 zfsvfs_parse_option(char *option, int token, substring_t *args, vfs_t *vfsp) 123 { 124 switch (token) { 125 case TOKEN_RO: 126 vfsp->vfs_readonly = B_TRUE; 127 vfsp->vfs_do_readonly = B_TRUE; 128 break; 129 case TOKEN_RW: 130 vfsp->vfs_readonly = B_FALSE; 131 vfsp->vfs_do_readonly = B_TRUE; 132 break; 133 case TOKEN_SETUID: 134 vfsp->vfs_setuid = B_TRUE; 135 vfsp->vfs_do_setuid = B_TRUE; 136 break; 137 case TOKEN_NOSETUID: 138 vfsp->vfs_setuid = B_FALSE; 139 vfsp->vfs_do_setuid = B_TRUE; 140 break; 141 case TOKEN_EXEC: 142 vfsp->vfs_exec = B_TRUE; 143 vfsp->vfs_do_exec = B_TRUE; 144 break; 145 case TOKEN_NOEXEC: 146 vfsp->vfs_exec = B_FALSE; 147 vfsp->vfs_do_exec = B_TRUE; 148 break; 149 case TOKEN_DEVICES: 150 vfsp->vfs_devices = B_TRUE; 151 vfsp->vfs_do_devices = B_TRUE; 152 break; 153 case TOKEN_NODEVICES: 154 vfsp->vfs_devices = B_FALSE; 155 vfsp->vfs_do_devices = B_TRUE; 156 break; 157 case TOKEN_DIRXATTR: 158 vfsp->vfs_xattr = ZFS_XATTR_DIR; 159 vfsp->vfs_do_xattr = B_TRUE; 160 break; 161 case TOKEN_SAXATTR: 162 vfsp->vfs_xattr = ZFS_XATTR_SA; 163 vfsp->vfs_do_xattr = B_TRUE; 164 break; 165 case TOKEN_XATTR: 166 vfsp->vfs_xattr = ZFS_XATTR_DIR; 167 vfsp->vfs_do_xattr = B_TRUE; 168 break; 169 case TOKEN_NOXATTR: 170 vfsp->vfs_xattr = ZFS_XATTR_OFF; 171 vfsp->vfs_do_xattr = B_TRUE; 172 break; 173 case TOKEN_ATIME: 174 vfsp->vfs_atime = B_TRUE; 175 vfsp->vfs_do_atime = B_TRUE; 176 break; 177 case TOKEN_NOATIME: 178 vfsp->vfs_atime = B_FALSE; 179 vfsp->vfs_do_atime = B_TRUE; 180 break; 181 case TOKEN_RELATIME: 182 vfsp->vfs_relatime = B_TRUE; 183 vfsp->vfs_do_relatime = B_TRUE; 184 break; 185 case TOKEN_NORELATIME: 186 vfsp->vfs_relatime = B_FALSE; 187 vfsp->vfs_do_relatime = B_TRUE; 188 break; 189 case TOKEN_NBMAND: 190 vfsp->vfs_nbmand = B_TRUE; 191 vfsp->vfs_do_nbmand = B_TRUE; 192 break; 193 case TOKEN_NONBMAND: 194 vfsp->vfs_nbmand = B_FALSE; 195 vfsp->vfs_do_nbmand = B_TRUE; 196 break; 197 case TOKEN_MNTPOINT: 198 vfsp->vfs_mntpoint = match_strdup(&args[0]); 199 if (vfsp->vfs_mntpoint == NULL) 200 return (SET_ERROR(ENOMEM)); 201 202 break; 203 default: 204 break; 205 } 206 207 return (0); 208 } 209 210 /* 211 * Parse the raw mntopts and return a vfs_t describing the options. 212 */ 213 static int 214 zfsvfs_parse_options(char *mntopts, vfs_t **vfsp) 215 { 216 vfs_t *tmp_vfsp; 217 int error; 218 219 tmp_vfsp = kmem_zalloc(sizeof (vfs_t), KM_SLEEP); 220 221 if (mntopts != NULL) { 222 substring_t args[MAX_OPT_ARGS]; 223 char *tmp_mntopts, *p, *t; 224 int token; 225 226 tmp_mntopts = t = kmem_strdup(mntopts); 227 if (tmp_mntopts == NULL) 228 return (SET_ERROR(ENOMEM)); 229 230 while ((p = strsep(&t, ",")) != NULL) { 231 if (!*p) 232 continue; 233 234 args[0].to = args[0].from = NULL; 235 token = match_token(p, zpl_tokens, args); 236 error = zfsvfs_parse_option(p, token, args, tmp_vfsp); 237 if (error) { 238 kmem_strfree(tmp_mntopts); 239 zfsvfs_vfs_free(tmp_vfsp); 240 return (error); 241 } 242 } 243 244 kmem_strfree(tmp_mntopts); 245 } 246 247 *vfsp = tmp_vfsp; 248 249 return (0); 250 } 251 252 boolean_t 253 zfs_is_readonly(zfsvfs_t *zfsvfs) 254 { 255 return (!!(zfsvfs->z_sb->s_flags & SB_RDONLY)); 256 } 257 258 int 259 zfs_sync(struct super_block *sb, int wait, cred_t *cr) 260 { 261 (void) cr; 262 zfsvfs_t *zfsvfs = sb->s_fs_info; 263 264 /* 265 * Semantically, the only requirement is that the sync be initiated. 266 * The DMU syncs out txgs frequently, so there's nothing to do. 267 */ 268 if (!wait) 269 return (0); 270 271 if (zfsvfs != NULL) { 272 /* 273 * Sync a specific filesystem. 274 */ 275 dsl_pool_t *dp; 276 int error; 277 278 if ((error = zfs_enter(zfsvfs, FTAG)) != 0) 279 return (error); 280 dp = dmu_objset_pool(zfsvfs->z_os); 281 282 /* 283 * If the system is shutting down, then skip any 284 * filesystems which may exist on a suspended pool. 285 */ 286 if (spa_suspended(dp->dp_spa)) { 287 zfs_exit(zfsvfs, FTAG); 288 return (0); 289 } 290 291 if (zfsvfs->z_log != NULL) 292 zil_commit(zfsvfs->z_log, 0); 293 294 zfs_exit(zfsvfs, FTAG); 295 } else { 296 /* 297 * Sync all ZFS filesystems. This is what happens when you 298 * run sync(1). Unlike other filesystems, ZFS honors the 299 * request by waiting for all pools to commit all dirty data. 300 */ 301 spa_sync_allpools(); 302 } 303 304 return (0); 305 } 306 307 static void 308 atime_changed_cb(void *arg, uint64_t newval) 309 { 310 zfsvfs_t *zfsvfs = arg; 311 struct super_block *sb = zfsvfs->z_sb; 312 313 if (sb == NULL) 314 return; 315 /* 316 * Update SB_NOATIME bit in VFS super block. Since atime update is 317 * determined by atime_needs_update(), atime_needs_update() needs to 318 * return false if atime is turned off, and not unconditionally return 319 * false if atime is turned on. 320 */ 321 if (newval) 322 sb->s_flags &= ~SB_NOATIME; 323 else 324 sb->s_flags |= SB_NOATIME; 325 } 326 327 static void 328 relatime_changed_cb(void *arg, uint64_t newval) 329 { 330 ((zfsvfs_t *)arg)->z_relatime = newval; 331 } 332 333 static void 334 xattr_changed_cb(void *arg, uint64_t newval) 335 { 336 zfsvfs_t *zfsvfs = arg; 337 338 if (newval == ZFS_XATTR_OFF) { 339 zfsvfs->z_flags &= ~ZSB_XATTR; 340 } else { 341 zfsvfs->z_flags |= ZSB_XATTR; 342 343 if (newval == ZFS_XATTR_SA) 344 zfsvfs->z_xattr_sa = B_TRUE; 345 else 346 zfsvfs->z_xattr_sa = B_FALSE; 347 } 348 } 349 350 static void 351 acltype_changed_cb(void *arg, uint64_t newval) 352 { 353 zfsvfs_t *zfsvfs = arg; 354 355 switch (newval) { 356 case ZFS_ACLTYPE_NFSV4: 357 case ZFS_ACLTYPE_OFF: 358 zfsvfs->z_acl_type = ZFS_ACLTYPE_OFF; 359 zfsvfs->z_sb->s_flags &= ~SB_POSIXACL; 360 break; 361 case ZFS_ACLTYPE_POSIX: 362 #ifdef CONFIG_FS_POSIX_ACL 363 zfsvfs->z_acl_type = ZFS_ACLTYPE_POSIX; 364 zfsvfs->z_sb->s_flags |= SB_POSIXACL; 365 #else 366 zfsvfs->z_acl_type = ZFS_ACLTYPE_OFF; 367 zfsvfs->z_sb->s_flags &= ~SB_POSIXACL; 368 #endif /* CONFIG_FS_POSIX_ACL */ 369 break; 370 default: 371 break; 372 } 373 } 374 375 static void 376 blksz_changed_cb(void *arg, uint64_t newval) 377 { 378 zfsvfs_t *zfsvfs = arg; 379 ASSERT3U(newval, <=, spa_maxblocksize(dmu_objset_spa(zfsvfs->z_os))); 380 ASSERT3U(newval, >=, SPA_MINBLOCKSIZE); 381 ASSERT(ISP2(newval)); 382 383 zfsvfs->z_max_blksz = newval; 384 } 385 386 static void 387 readonly_changed_cb(void *arg, uint64_t newval) 388 { 389 zfsvfs_t *zfsvfs = arg; 390 struct super_block *sb = zfsvfs->z_sb; 391 392 if (sb == NULL) 393 return; 394 395 if (newval) 396 sb->s_flags |= SB_RDONLY; 397 else 398 sb->s_flags &= ~SB_RDONLY; 399 } 400 401 static void 402 devices_changed_cb(void *arg, uint64_t newval) 403 { 404 } 405 406 static void 407 setuid_changed_cb(void *arg, uint64_t newval) 408 { 409 } 410 411 static void 412 exec_changed_cb(void *arg, uint64_t newval) 413 { 414 } 415 416 static void 417 nbmand_changed_cb(void *arg, uint64_t newval) 418 { 419 zfsvfs_t *zfsvfs = arg; 420 struct super_block *sb = zfsvfs->z_sb; 421 422 if (sb == NULL) 423 return; 424 425 if (newval == TRUE) 426 sb->s_flags |= SB_MANDLOCK; 427 else 428 sb->s_flags &= ~SB_MANDLOCK; 429 } 430 431 static void 432 snapdir_changed_cb(void *arg, uint64_t newval) 433 { 434 ((zfsvfs_t *)arg)->z_show_ctldir = newval; 435 } 436 437 static void 438 acl_mode_changed_cb(void *arg, uint64_t newval) 439 { 440 zfsvfs_t *zfsvfs = arg; 441 442 zfsvfs->z_acl_mode = newval; 443 } 444 445 static void 446 acl_inherit_changed_cb(void *arg, uint64_t newval) 447 { 448 ((zfsvfs_t *)arg)->z_acl_inherit = newval; 449 } 450 451 static int 452 zfs_register_callbacks(vfs_t *vfsp) 453 { 454 struct dsl_dataset *ds = NULL; 455 objset_t *os = NULL; 456 zfsvfs_t *zfsvfs = NULL; 457 int error = 0; 458 459 ASSERT(vfsp); 460 zfsvfs = vfsp->vfs_data; 461 ASSERT(zfsvfs); 462 os = zfsvfs->z_os; 463 464 /* 465 * The act of registering our callbacks will destroy any mount 466 * options we may have. In order to enable temporary overrides 467 * of mount options, we stash away the current values and 468 * restore them after we register the callbacks. 469 */ 470 if (zfs_is_readonly(zfsvfs) || !spa_writeable(dmu_objset_spa(os))) { 471 vfsp->vfs_do_readonly = B_TRUE; 472 vfsp->vfs_readonly = B_TRUE; 473 } 474 475 /* 476 * Register property callbacks. 477 * 478 * It would probably be fine to just check for i/o error from 479 * the first prop_register(), but I guess I like to go 480 * overboard... 481 */ 482 ds = dmu_objset_ds(os); 483 dsl_pool_config_enter(dmu_objset_pool(os), FTAG); 484 error = dsl_prop_register(ds, 485 zfs_prop_to_name(ZFS_PROP_ATIME), atime_changed_cb, zfsvfs); 486 error = error ? error : dsl_prop_register(ds, 487 zfs_prop_to_name(ZFS_PROP_RELATIME), relatime_changed_cb, zfsvfs); 488 error = error ? error : dsl_prop_register(ds, 489 zfs_prop_to_name(ZFS_PROP_XATTR), xattr_changed_cb, zfsvfs); 490 error = error ? error : dsl_prop_register(ds, 491 zfs_prop_to_name(ZFS_PROP_RECORDSIZE), blksz_changed_cb, zfsvfs); 492 error = error ? error : dsl_prop_register(ds, 493 zfs_prop_to_name(ZFS_PROP_READONLY), readonly_changed_cb, zfsvfs); 494 error = error ? error : dsl_prop_register(ds, 495 zfs_prop_to_name(ZFS_PROP_DEVICES), devices_changed_cb, zfsvfs); 496 error = error ? error : dsl_prop_register(ds, 497 zfs_prop_to_name(ZFS_PROP_SETUID), setuid_changed_cb, zfsvfs); 498 error = error ? error : dsl_prop_register(ds, 499 zfs_prop_to_name(ZFS_PROP_EXEC), exec_changed_cb, zfsvfs); 500 error = error ? error : dsl_prop_register(ds, 501 zfs_prop_to_name(ZFS_PROP_SNAPDIR), snapdir_changed_cb, zfsvfs); 502 error = error ? error : dsl_prop_register(ds, 503 zfs_prop_to_name(ZFS_PROP_ACLTYPE), acltype_changed_cb, zfsvfs); 504 error = error ? error : dsl_prop_register(ds, 505 zfs_prop_to_name(ZFS_PROP_ACLMODE), acl_mode_changed_cb, zfsvfs); 506 error = error ? error : dsl_prop_register(ds, 507 zfs_prop_to_name(ZFS_PROP_ACLINHERIT), acl_inherit_changed_cb, 508 zfsvfs); 509 error = error ? error : dsl_prop_register(ds, 510 zfs_prop_to_name(ZFS_PROP_NBMAND), nbmand_changed_cb, zfsvfs); 511 dsl_pool_config_exit(dmu_objset_pool(os), FTAG); 512 if (error) 513 goto unregister; 514 515 /* 516 * Invoke our callbacks to restore temporary mount options. 517 */ 518 if (vfsp->vfs_do_readonly) 519 readonly_changed_cb(zfsvfs, vfsp->vfs_readonly); 520 if (vfsp->vfs_do_setuid) 521 setuid_changed_cb(zfsvfs, vfsp->vfs_setuid); 522 if (vfsp->vfs_do_exec) 523 exec_changed_cb(zfsvfs, vfsp->vfs_exec); 524 if (vfsp->vfs_do_devices) 525 devices_changed_cb(zfsvfs, vfsp->vfs_devices); 526 if (vfsp->vfs_do_xattr) 527 xattr_changed_cb(zfsvfs, vfsp->vfs_xattr); 528 if (vfsp->vfs_do_atime) 529 atime_changed_cb(zfsvfs, vfsp->vfs_atime); 530 if (vfsp->vfs_do_relatime) 531 relatime_changed_cb(zfsvfs, vfsp->vfs_relatime); 532 if (vfsp->vfs_do_nbmand) 533 nbmand_changed_cb(zfsvfs, vfsp->vfs_nbmand); 534 535 return (0); 536 537 unregister: 538 dsl_prop_unregister_all(ds, zfsvfs); 539 return (error); 540 } 541 542 /* 543 * Takes a dataset, a property, a value and that value's setpoint as 544 * found in the ZAP. Checks if the property has been changed in the vfs. 545 * If so, val and setpoint will be overwritten with updated content. 546 * Otherwise, they are left unchanged. 547 */ 548 int 549 zfs_get_temporary_prop(dsl_dataset_t *ds, zfs_prop_t zfs_prop, uint64_t *val, 550 char *setpoint) 551 { 552 int error; 553 zfsvfs_t *zfvp; 554 vfs_t *vfsp; 555 objset_t *os; 556 uint64_t tmp = *val; 557 558 error = dmu_objset_from_ds(ds, &os); 559 if (error != 0) 560 return (error); 561 562 if (dmu_objset_type(os) != DMU_OST_ZFS) 563 return (EINVAL); 564 565 mutex_enter(&os->os_user_ptr_lock); 566 zfvp = dmu_objset_get_user(os); 567 mutex_exit(&os->os_user_ptr_lock); 568 if (zfvp == NULL) 569 return (ESRCH); 570 571 vfsp = zfvp->z_vfs; 572 573 switch (zfs_prop) { 574 case ZFS_PROP_ATIME: 575 if (vfsp->vfs_do_atime) 576 tmp = vfsp->vfs_atime; 577 break; 578 case ZFS_PROP_RELATIME: 579 if (vfsp->vfs_do_relatime) 580 tmp = vfsp->vfs_relatime; 581 break; 582 case ZFS_PROP_DEVICES: 583 if (vfsp->vfs_do_devices) 584 tmp = vfsp->vfs_devices; 585 break; 586 case ZFS_PROP_EXEC: 587 if (vfsp->vfs_do_exec) 588 tmp = vfsp->vfs_exec; 589 break; 590 case ZFS_PROP_SETUID: 591 if (vfsp->vfs_do_setuid) 592 tmp = vfsp->vfs_setuid; 593 break; 594 case ZFS_PROP_READONLY: 595 if (vfsp->vfs_do_readonly) 596 tmp = vfsp->vfs_readonly; 597 break; 598 case ZFS_PROP_XATTR: 599 if (vfsp->vfs_do_xattr) 600 tmp = vfsp->vfs_xattr; 601 break; 602 case ZFS_PROP_NBMAND: 603 if (vfsp->vfs_do_nbmand) 604 tmp = vfsp->vfs_nbmand; 605 break; 606 default: 607 return (ENOENT); 608 } 609 610 if (tmp != *val) { 611 if (setpoint) 612 (void) strcpy(setpoint, "temporary"); 613 *val = tmp; 614 } 615 return (0); 616 } 617 618 /* 619 * Associate this zfsvfs with the given objset, which must be owned. 620 * This will cache a bunch of on-disk state from the objset in the 621 * zfsvfs. 622 */ 623 static int 624 zfsvfs_init(zfsvfs_t *zfsvfs, objset_t *os) 625 { 626 int error; 627 uint64_t val; 628 629 zfsvfs->z_max_blksz = SPA_OLD_MAXBLOCKSIZE; 630 zfsvfs->z_show_ctldir = ZFS_SNAPDIR_VISIBLE; 631 zfsvfs->z_os = os; 632 633 error = zfs_get_zplprop(os, ZFS_PROP_VERSION, &zfsvfs->z_version); 634 if (error != 0) 635 return (error); 636 if (zfsvfs->z_version > 637 zfs_zpl_version_map(spa_version(dmu_objset_spa(os)))) { 638 (void) printk("Can't mount a version %lld file system " 639 "on a version %lld pool\n. Pool must be upgraded to mount " 640 "this file system.\n", (u_longlong_t)zfsvfs->z_version, 641 (u_longlong_t)spa_version(dmu_objset_spa(os))); 642 return (SET_ERROR(ENOTSUP)); 643 } 644 error = zfs_get_zplprop(os, ZFS_PROP_NORMALIZE, &val); 645 if (error != 0) 646 return (error); 647 zfsvfs->z_norm = (int)val; 648 649 error = zfs_get_zplprop(os, ZFS_PROP_UTF8ONLY, &val); 650 if (error != 0) 651 return (error); 652 zfsvfs->z_utf8 = (val != 0); 653 654 error = zfs_get_zplprop(os, ZFS_PROP_CASE, &val); 655 if (error != 0) 656 return (error); 657 zfsvfs->z_case = (uint_t)val; 658 659 if ((error = zfs_get_zplprop(os, ZFS_PROP_ACLTYPE, &val)) != 0) 660 return (error); 661 zfsvfs->z_acl_type = (uint_t)val; 662 663 /* 664 * Fold case on file systems that are always or sometimes case 665 * insensitive. 666 */ 667 if (zfsvfs->z_case == ZFS_CASE_INSENSITIVE || 668 zfsvfs->z_case == ZFS_CASE_MIXED) 669 zfsvfs->z_norm |= U8_TEXTPREP_TOUPPER; 670 671 zfsvfs->z_use_fuids = USE_FUIDS(zfsvfs->z_version, zfsvfs->z_os); 672 zfsvfs->z_use_sa = USE_SA(zfsvfs->z_version, zfsvfs->z_os); 673 674 uint64_t sa_obj = 0; 675 if (zfsvfs->z_use_sa) { 676 /* should either have both of these objects or none */ 677 error = zap_lookup(os, MASTER_NODE_OBJ, ZFS_SA_ATTRS, 8, 1, 678 &sa_obj); 679 if (error != 0) 680 return (error); 681 682 error = zfs_get_zplprop(os, ZFS_PROP_XATTR, &val); 683 if ((error == 0) && (val == ZFS_XATTR_SA)) 684 zfsvfs->z_xattr_sa = B_TRUE; 685 } 686 687 error = zap_lookup(os, MASTER_NODE_OBJ, ZFS_ROOT_OBJ, 8, 1, 688 &zfsvfs->z_root); 689 if (error != 0) 690 return (error); 691 ASSERT(zfsvfs->z_root != 0); 692 693 error = zap_lookup(os, MASTER_NODE_OBJ, ZFS_UNLINKED_SET, 8, 1, 694 &zfsvfs->z_unlinkedobj); 695 if (error != 0) 696 return (error); 697 698 error = zap_lookup(os, MASTER_NODE_OBJ, 699 zfs_userquota_prop_prefixes[ZFS_PROP_USERQUOTA], 700 8, 1, &zfsvfs->z_userquota_obj); 701 if (error == ENOENT) 702 zfsvfs->z_userquota_obj = 0; 703 else if (error != 0) 704 return (error); 705 706 error = zap_lookup(os, MASTER_NODE_OBJ, 707 zfs_userquota_prop_prefixes[ZFS_PROP_GROUPQUOTA], 708 8, 1, &zfsvfs->z_groupquota_obj); 709 if (error == ENOENT) 710 zfsvfs->z_groupquota_obj = 0; 711 else if (error != 0) 712 return (error); 713 714 error = zap_lookup(os, MASTER_NODE_OBJ, 715 zfs_userquota_prop_prefixes[ZFS_PROP_PROJECTQUOTA], 716 8, 1, &zfsvfs->z_projectquota_obj); 717 if (error == ENOENT) 718 zfsvfs->z_projectquota_obj = 0; 719 else if (error != 0) 720 return (error); 721 722 error = zap_lookup(os, MASTER_NODE_OBJ, 723 zfs_userquota_prop_prefixes[ZFS_PROP_USEROBJQUOTA], 724 8, 1, &zfsvfs->z_userobjquota_obj); 725 if (error == ENOENT) 726 zfsvfs->z_userobjquota_obj = 0; 727 else if (error != 0) 728 return (error); 729 730 error = zap_lookup(os, MASTER_NODE_OBJ, 731 zfs_userquota_prop_prefixes[ZFS_PROP_GROUPOBJQUOTA], 732 8, 1, &zfsvfs->z_groupobjquota_obj); 733 if (error == ENOENT) 734 zfsvfs->z_groupobjquota_obj = 0; 735 else if (error != 0) 736 return (error); 737 738 error = zap_lookup(os, MASTER_NODE_OBJ, 739 zfs_userquota_prop_prefixes[ZFS_PROP_PROJECTOBJQUOTA], 740 8, 1, &zfsvfs->z_projectobjquota_obj); 741 if (error == ENOENT) 742 zfsvfs->z_projectobjquota_obj = 0; 743 else if (error != 0) 744 return (error); 745 746 error = zap_lookup(os, MASTER_NODE_OBJ, ZFS_FUID_TABLES, 8, 1, 747 &zfsvfs->z_fuid_obj); 748 if (error == ENOENT) 749 zfsvfs->z_fuid_obj = 0; 750 else if (error != 0) 751 return (error); 752 753 error = zap_lookup(os, MASTER_NODE_OBJ, ZFS_SHARES_DIR, 8, 1, 754 &zfsvfs->z_shares_dir); 755 if (error == ENOENT) 756 zfsvfs->z_shares_dir = 0; 757 else if (error != 0) 758 return (error); 759 760 error = sa_setup(os, sa_obj, zfs_attr_table, ZPL_END, 761 &zfsvfs->z_attr_table); 762 if (error != 0) 763 return (error); 764 765 if (zfsvfs->z_version >= ZPL_VERSION_SA) 766 sa_register_update_callback(os, zfs_sa_upgrade); 767 768 return (0); 769 } 770 771 int 772 zfsvfs_create(const char *osname, boolean_t readonly, zfsvfs_t **zfvp) 773 { 774 objset_t *os; 775 zfsvfs_t *zfsvfs; 776 int error; 777 boolean_t ro = (readonly || (strchr(osname, '@') != NULL)); 778 779 zfsvfs = kmem_zalloc(sizeof (zfsvfs_t), KM_SLEEP); 780 781 error = dmu_objset_own(osname, DMU_OST_ZFS, ro, B_TRUE, zfsvfs, &os); 782 if (error != 0) { 783 kmem_free(zfsvfs, sizeof (zfsvfs_t)); 784 return (error); 785 } 786 787 error = zfsvfs_create_impl(zfvp, zfsvfs, os); 788 789 return (error); 790 } 791 792 793 /* 794 * Note: zfsvfs is assumed to be malloc'd, and will be freed by this function 795 * on a failure. Do not pass in a statically allocated zfsvfs. 796 */ 797 int 798 zfsvfs_create_impl(zfsvfs_t **zfvp, zfsvfs_t *zfsvfs, objset_t *os) 799 { 800 int error; 801 802 zfsvfs->z_vfs = NULL; 803 zfsvfs->z_sb = NULL; 804 zfsvfs->z_parent = zfsvfs; 805 806 mutex_init(&zfsvfs->z_znodes_lock, NULL, MUTEX_DEFAULT, NULL); 807 mutex_init(&zfsvfs->z_lock, NULL, MUTEX_DEFAULT, NULL); 808 list_create(&zfsvfs->z_all_znodes, sizeof (znode_t), 809 offsetof(znode_t, z_link_node)); 810 ZFS_TEARDOWN_INIT(zfsvfs); 811 rw_init(&zfsvfs->z_teardown_inactive_lock, NULL, RW_DEFAULT, NULL); 812 rw_init(&zfsvfs->z_fuid_lock, NULL, RW_DEFAULT, NULL); 813 814 int size = MIN(1 << (highbit64(zfs_object_mutex_size) - 1), 815 ZFS_OBJ_MTX_MAX); 816 zfsvfs->z_hold_size = size; 817 zfsvfs->z_hold_trees = vmem_zalloc(sizeof (avl_tree_t) * size, 818 KM_SLEEP); 819 zfsvfs->z_hold_locks = vmem_zalloc(sizeof (kmutex_t) * size, KM_SLEEP); 820 for (int i = 0; i != size; i++) { 821 avl_create(&zfsvfs->z_hold_trees[i], zfs_znode_hold_compare, 822 sizeof (znode_hold_t), offsetof(znode_hold_t, zh_node)); 823 mutex_init(&zfsvfs->z_hold_locks[i], NULL, MUTEX_DEFAULT, NULL); 824 } 825 826 error = zfsvfs_init(zfsvfs, os); 827 if (error != 0) { 828 dmu_objset_disown(os, B_TRUE, zfsvfs); 829 *zfvp = NULL; 830 zfsvfs_free(zfsvfs); 831 return (error); 832 } 833 834 zfsvfs->z_drain_task = TASKQID_INVALID; 835 zfsvfs->z_draining = B_FALSE; 836 zfsvfs->z_drain_cancel = B_TRUE; 837 838 *zfvp = zfsvfs; 839 return (0); 840 } 841 842 static int 843 zfsvfs_setup(zfsvfs_t *zfsvfs, boolean_t mounting) 844 { 845 int error; 846 boolean_t readonly = zfs_is_readonly(zfsvfs); 847 848 error = zfs_register_callbacks(zfsvfs->z_vfs); 849 if (error) 850 return (error); 851 852 /* 853 * If we are not mounting (ie: online recv), then we don't 854 * have to worry about replaying the log as we blocked all 855 * operations out since we closed the ZIL. 856 */ 857 if (mounting) { 858 ASSERT3P(zfsvfs->z_kstat.dk_kstats, ==, NULL); 859 error = dataset_kstats_create(&zfsvfs->z_kstat, zfsvfs->z_os); 860 if (error) 861 return (error); 862 zfsvfs->z_log = zil_open(zfsvfs->z_os, zfs_get_data, 863 &zfsvfs->z_kstat.dk_zil_sums); 864 865 /* 866 * During replay we remove the read only flag to 867 * allow replays to succeed. 868 */ 869 if (readonly != 0) { 870 readonly_changed_cb(zfsvfs, B_FALSE); 871 } else { 872 zap_stats_t zs; 873 if (zap_get_stats(zfsvfs->z_os, zfsvfs->z_unlinkedobj, 874 &zs) == 0) { 875 dataset_kstats_update_nunlinks_kstat( 876 &zfsvfs->z_kstat, zs.zs_num_entries); 877 dprintf_ds(zfsvfs->z_os->os_dsl_dataset, 878 "num_entries in unlinked set: %llu", 879 zs.zs_num_entries); 880 } 881 zfs_unlinked_drain(zfsvfs); 882 dsl_dir_t *dd = zfsvfs->z_os->os_dsl_dataset->ds_dir; 883 dd->dd_activity_cancelled = B_FALSE; 884 } 885 886 /* 887 * Parse and replay the intent log. 888 * 889 * Because of ziltest, this must be done after 890 * zfs_unlinked_drain(). (Further note: ziltest 891 * doesn't use readonly mounts, where 892 * zfs_unlinked_drain() isn't called.) This is because 893 * ziltest causes spa_sync() to think it's committed, 894 * but actually it is not, so the intent log contains 895 * many txg's worth of changes. 896 * 897 * In particular, if object N is in the unlinked set in 898 * the last txg to actually sync, then it could be 899 * actually freed in a later txg and then reallocated 900 * in a yet later txg. This would write a "create 901 * object N" record to the intent log. Normally, this 902 * would be fine because the spa_sync() would have 903 * written out the fact that object N is free, before 904 * we could write the "create object N" intent log 905 * record. 906 * 907 * But when we are in ziltest mode, we advance the "open 908 * txg" without actually spa_sync()-ing the changes to 909 * disk. So we would see that object N is still 910 * allocated and in the unlinked set, and there is an 911 * intent log record saying to allocate it. 912 */ 913 if (spa_writeable(dmu_objset_spa(zfsvfs->z_os))) { 914 if (zil_replay_disable) { 915 zil_destroy(zfsvfs->z_log, B_FALSE); 916 } else { 917 zfsvfs->z_replay = B_TRUE; 918 zil_replay(zfsvfs->z_os, zfsvfs, 919 zfs_replay_vector); 920 zfsvfs->z_replay = B_FALSE; 921 } 922 } 923 924 /* restore readonly bit */ 925 if (readonly != 0) 926 readonly_changed_cb(zfsvfs, B_TRUE); 927 } else { 928 ASSERT3P(zfsvfs->z_kstat.dk_kstats, !=, NULL); 929 zfsvfs->z_log = zil_open(zfsvfs->z_os, zfs_get_data, 930 &zfsvfs->z_kstat.dk_zil_sums); 931 } 932 933 /* 934 * Set the objset user_ptr to track its zfsvfs. 935 */ 936 mutex_enter(&zfsvfs->z_os->os_user_ptr_lock); 937 dmu_objset_set_user(zfsvfs->z_os, zfsvfs); 938 mutex_exit(&zfsvfs->z_os->os_user_ptr_lock); 939 940 return (0); 941 } 942 943 void 944 zfsvfs_free(zfsvfs_t *zfsvfs) 945 { 946 int i, size = zfsvfs->z_hold_size; 947 948 zfs_fuid_destroy(zfsvfs); 949 950 mutex_destroy(&zfsvfs->z_znodes_lock); 951 mutex_destroy(&zfsvfs->z_lock); 952 list_destroy(&zfsvfs->z_all_znodes); 953 ZFS_TEARDOWN_DESTROY(zfsvfs); 954 rw_destroy(&zfsvfs->z_teardown_inactive_lock); 955 rw_destroy(&zfsvfs->z_fuid_lock); 956 for (i = 0; i != size; i++) { 957 avl_destroy(&zfsvfs->z_hold_trees[i]); 958 mutex_destroy(&zfsvfs->z_hold_locks[i]); 959 } 960 vmem_free(zfsvfs->z_hold_trees, sizeof (avl_tree_t) * size); 961 vmem_free(zfsvfs->z_hold_locks, sizeof (kmutex_t) * size); 962 zfsvfs_vfs_free(zfsvfs->z_vfs); 963 dataset_kstats_destroy(&zfsvfs->z_kstat); 964 kmem_free(zfsvfs, sizeof (zfsvfs_t)); 965 } 966 967 static void 968 zfs_set_fuid_feature(zfsvfs_t *zfsvfs) 969 { 970 zfsvfs->z_use_fuids = USE_FUIDS(zfsvfs->z_version, zfsvfs->z_os); 971 zfsvfs->z_use_sa = USE_SA(zfsvfs->z_version, zfsvfs->z_os); 972 } 973 974 static void 975 zfs_unregister_callbacks(zfsvfs_t *zfsvfs) 976 { 977 objset_t *os = zfsvfs->z_os; 978 979 if (!dmu_objset_is_snapshot(os)) 980 dsl_prop_unregister_all(dmu_objset_ds(os), zfsvfs); 981 } 982 983 #ifdef HAVE_MLSLABEL 984 /* 985 * Check that the hex label string is appropriate for the dataset being 986 * mounted into the global_zone proper. 987 * 988 * Return an error if the hex label string is not default or 989 * admin_low/admin_high. For admin_low labels, the corresponding 990 * dataset must be readonly. 991 */ 992 int 993 zfs_check_global_label(const char *dsname, const char *hexsl) 994 { 995 if (strcasecmp(hexsl, ZFS_MLSLABEL_DEFAULT) == 0) 996 return (0); 997 if (strcasecmp(hexsl, ADMIN_HIGH) == 0) 998 return (0); 999 if (strcasecmp(hexsl, ADMIN_LOW) == 0) { 1000 /* must be readonly */ 1001 uint64_t rdonly; 1002 1003 if (dsl_prop_get_integer(dsname, 1004 zfs_prop_to_name(ZFS_PROP_READONLY), &rdonly, NULL)) 1005 return (SET_ERROR(EACCES)); 1006 return (rdonly ? 0 : SET_ERROR(EACCES)); 1007 } 1008 return (SET_ERROR(EACCES)); 1009 } 1010 #endif /* HAVE_MLSLABEL */ 1011 1012 static int 1013 zfs_statfs_project(zfsvfs_t *zfsvfs, znode_t *zp, struct kstatfs *statp, 1014 uint32_t bshift) 1015 { 1016 char buf[20 + DMU_OBJACCT_PREFIX_LEN]; 1017 uint64_t offset = DMU_OBJACCT_PREFIX_LEN; 1018 uint64_t quota; 1019 uint64_t used; 1020 int err; 1021 1022 strlcpy(buf, DMU_OBJACCT_PREFIX, DMU_OBJACCT_PREFIX_LEN + 1); 1023 err = zfs_id_to_fuidstr(zfsvfs, NULL, zp->z_projid, buf + offset, 1024 sizeof (buf) - offset, B_FALSE); 1025 if (err) 1026 return (err); 1027 1028 if (zfsvfs->z_projectquota_obj == 0) 1029 goto objs; 1030 1031 err = zap_lookup(zfsvfs->z_os, zfsvfs->z_projectquota_obj, 1032 buf + offset, 8, 1, "a); 1033 if (err == ENOENT) 1034 goto objs; 1035 else if (err) 1036 return (err); 1037 1038 err = zap_lookup(zfsvfs->z_os, DMU_PROJECTUSED_OBJECT, 1039 buf + offset, 8, 1, &used); 1040 if (unlikely(err == ENOENT)) { 1041 uint32_t blksize; 1042 u_longlong_t nblocks; 1043 1044 /* 1045 * Quota accounting is async, so it is possible race case. 1046 * There is at least one object with the given project ID. 1047 */ 1048 sa_object_size(zp->z_sa_hdl, &blksize, &nblocks); 1049 if (unlikely(zp->z_blksz == 0)) 1050 blksize = zfsvfs->z_max_blksz; 1051 1052 used = blksize * nblocks; 1053 } else if (err) { 1054 return (err); 1055 } 1056 1057 statp->f_blocks = quota >> bshift; 1058 statp->f_bfree = (quota > used) ? ((quota - used) >> bshift) : 0; 1059 statp->f_bavail = statp->f_bfree; 1060 1061 objs: 1062 if (zfsvfs->z_projectobjquota_obj == 0) 1063 return (0); 1064 1065 err = zap_lookup(zfsvfs->z_os, zfsvfs->z_projectobjquota_obj, 1066 buf + offset, 8, 1, "a); 1067 if (err == ENOENT) 1068 return (0); 1069 else if (err) 1070 return (err); 1071 1072 err = zap_lookup(zfsvfs->z_os, DMU_PROJECTUSED_OBJECT, 1073 buf, 8, 1, &used); 1074 if (unlikely(err == ENOENT)) { 1075 /* 1076 * Quota accounting is async, so it is possible race case. 1077 * There is at least one object with the given project ID. 1078 */ 1079 used = 1; 1080 } else if (err) { 1081 return (err); 1082 } 1083 1084 statp->f_files = quota; 1085 statp->f_ffree = (quota > used) ? (quota - used) : 0; 1086 1087 return (0); 1088 } 1089 1090 int 1091 zfs_statvfs(struct inode *ip, struct kstatfs *statp) 1092 { 1093 zfsvfs_t *zfsvfs = ITOZSB(ip); 1094 uint64_t refdbytes, availbytes, usedobjs, availobjs; 1095 int err = 0; 1096 1097 if ((err = zfs_enter(zfsvfs, FTAG)) != 0) 1098 return (err); 1099 1100 dmu_objset_space(zfsvfs->z_os, 1101 &refdbytes, &availbytes, &usedobjs, &availobjs); 1102 1103 uint64_t fsid = dmu_objset_fsid_guid(zfsvfs->z_os); 1104 /* 1105 * The underlying storage pool actually uses multiple block 1106 * size. Under Solaris frsize (fragment size) is reported as 1107 * the smallest block size we support, and bsize (block size) 1108 * as the filesystem's maximum block size. Unfortunately, 1109 * under Linux the fragment size and block size are often used 1110 * interchangeably. Thus we are forced to report both of them 1111 * as the filesystem's maximum block size. 1112 */ 1113 statp->f_frsize = zfsvfs->z_max_blksz; 1114 statp->f_bsize = zfsvfs->z_max_blksz; 1115 uint32_t bshift = fls(statp->f_bsize) - 1; 1116 1117 /* 1118 * The following report "total" blocks of various kinds in 1119 * the file system, but reported in terms of f_bsize - the 1120 * "preferred" size. 1121 */ 1122 1123 /* Round up so we never have a filesystem using 0 blocks. */ 1124 refdbytes = P2ROUNDUP(refdbytes, statp->f_bsize); 1125 statp->f_blocks = (refdbytes + availbytes) >> bshift; 1126 statp->f_bfree = availbytes >> bshift; 1127 statp->f_bavail = statp->f_bfree; /* no root reservation */ 1128 1129 /* 1130 * statvfs() should really be called statufs(), because it assumes 1131 * static metadata. ZFS doesn't preallocate files, so the best 1132 * we can do is report the max that could possibly fit in f_files, 1133 * and that minus the number actually used in f_ffree. 1134 * For f_ffree, report the smaller of the number of objects available 1135 * and the number of blocks (each object will take at least a block). 1136 */ 1137 statp->f_ffree = MIN(availobjs, availbytes >> DNODE_SHIFT); 1138 statp->f_files = statp->f_ffree + usedobjs; 1139 statp->f_fsid.val[0] = (uint32_t)fsid; 1140 statp->f_fsid.val[1] = (uint32_t)(fsid >> 32); 1141 statp->f_type = ZFS_SUPER_MAGIC; 1142 statp->f_namelen = MAXNAMELEN - 1; 1143 1144 /* 1145 * We have all of 40 characters to stuff a string here. 1146 * Is there anything useful we could/should provide? 1147 */ 1148 memset(statp->f_spare, 0, sizeof (statp->f_spare)); 1149 1150 if (dmu_objset_projectquota_enabled(zfsvfs->z_os) && 1151 dmu_objset_projectquota_present(zfsvfs->z_os)) { 1152 znode_t *zp = ITOZ(ip); 1153 1154 if (zp->z_pflags & ZFS_PROJINHERIT && zp->z_projid && 1155 zpl_is_valid_projid(zp->z_projid)) 1156 err = zfs_statfs_project(zfsvfs, zp, statp, bshift); 1157 } 1158 1159 zfs_exit(zfsvfs, FTAG); 1160 return (err); 1161 } 1162 1163 static int 1164 zfs_root(zfsvfs_t *zfsvfs, struct inode **ipp) 1165 { 1166 znode_t *rootzp; 1167 int error; 1168 1169 if ((error = zfs_enter(zfsvfs, FTAG)) != 0) 1170 return (error); 1171 1172 error = zfs_zget(zfsvfs, zfsvfs->z_root, &rootzp); 1173 if (error == 0) 1174 *ipp = ZTOI(rootzp); 1175 1176 zfs_exit(zfsvfs, FTAG); 1177 return (error); 1178 } 1179 1180 /* 1181 * Linux kernels older than 3.1 do not support a per-filesystem shrinker. 1182 * To accommodate this we must improvise and manually walk the list of znodes 1183 * attempting to prune dentries in order to be able to drop the inodes. 1184 * 1185 * To avoid scanning the same znodes multiple times they are always rotated 1186 * to the end of the z_all_znodes list. New znodes are inserted at the 1187 * end of the list so we're always scanning the oldest znodes first. 1188 */ 1189 static int 1190 zfs_prune_aliases(zfsvfs_t *zfsvfs, unsigned long nr_to_scan) 1191 { 1192 znode_t **zp_array, *zp; 1193 int max_array = MIN(nr_to_scan, PAGE_SIZE * 8 / sizeof (znode_t *)); 1194 int objects = 0; 1195 int i = 0, j = 0; 1196 1197 zp_array = vmem_zalloc(max_array * sizeof (znode_t *), KM_SLEEP); 1198 1199 mutex_enter(&zfsvfs->z_znodes_lock); 1200 while ((zp = list_head(&zfsvfs->z_all_znodes)) != NULL) { 1201 1202 if ((i++ > nr_to_scan) || (j >= max_array)) 1203 break; 1204 1205 ASSERT(list_link_active(&zp->z_link_node)); 1206 list_remove(&zfsvfs->z_all_znodes, zp); 1207 list_insert_tail(&zfsvfs->z_all_znodes, zp); 1208 1209 /* Skip active znodes and .zfs entries */ 1210 if (MUTEX_HELD(&zp->z_lock) || zp->z_is_ctldir) 1211 continue; 1212 1213 if (igrab(ZTOI(zp)) == NULL) 1214 continue; 1215 1216 zp_array[j] = zp; 1217 j++; 1218 } 1219 mutex_exit(&zfsvfs->z_znodes_lock); 1220 1221 for (i = 0; i < j; i++) { 1222 zp = zp_array[i]; 1223 1224 ASSERT3P(zp, !=, NULL); 1225 d_prune_aliases(ZTOI(zp)); 1226 1227 if (atomic_read(&ZTOI(zp)->i_count) == 1) 1228 objects++; 1229 1230 zrele(zp); 1231 } 1232 1233 vmem_free(zp_array, max_array * sizeof (znode_t *)); 1234 1235 return (objects); 1236 } 1237 1238 /* 1239 * The ARC has requested that the filesystem drop entries from the dentry 1240 * and inode caches. This can occur when the ARC needs to free meta data 1241 * blocks but can't because they are all pinned by entries in these caches. 1242 */ 1243 int 1244 zfs_prune(struct super_block *sb, unsigned long nr_to_scan, int *objects) 1245 { 1246 zfsvfs_t *zfsvfs = sb->s_fs_info; 1247 int error = 0; 1248 struct shrinker *shrinker = &sb->s_shrink; 1249 struct shrink_control sc = { 1250 .nr_to_scan = nr_to_scan, 1251 .gfp_mask = GFP_KERNEL, 1252 }; 1253 1254 if ((error = zfs_enter(zfsvfs, FTAG)) != 0) 1255 return (error); 1256 1257 #if defined(HAVE_SPLIT_SHRINKER_CALLBACK) && \ 1258 defined(SHRINK_CONTROL_HAS_NID) && \ 1259 defined(SHRINKER_NUMA_AWARE) 1260 if (sb->s_shrink.flags & SHRINKER_NUMA_AWARE) { 1261 *objects = 0; 1262 for_each_online_node(sc.nid) { 1263 *objects += (*shrinker->scan_objects)(shrinker, &sc); 1264 /* 1265 * reset sc.nr_to_scan, modified by 1266 * scan_objects == super_cache_scan 1267 */ 1268 sc.nr_to_scan = nr_to_scan; 1269 } 1270 } else { 1271 *objects = (*shrinker->scan_objects)(shrinker, &sc); 1272 } 1273 1274 #elif defined(HAVE_SPLIT_SHRINKER_CALLBACK) 1275 *objects = (*shrinker->scan_objects)(shrinker, &sc); 1276 #elif defined(HAVE_SINGLE_SHRINKER_CALLBACK) 1277 *objects = (*shrinker->shrink)(shrinker, &sc); 1278 #elif defined(HAVE_D_PRUNE_ALIASES) 1279 #define D_PRUNE_ALIASES_IS_DEFAULT 1280 *objects = zfs_prune_aliases(zfsvfs, nr_to_scan); 1281 #else 1282 #error "No available dentry and inode cache pruning mechanism." 1283 #endif 1284 1285 #if defined(HAVE_D_PRUNE_ALIASES) && !defined(D_PRUNE_ALIASES_IS_DEFAULT) 1286 #undef D_PRUNE_ALIASES_IS_DEFAULT 1287 /* 1288 * Fall back to zfs_prune_aliases if the kernel's per-superblock 1289 * shrinker couldn't free anything, possibly due to the inodes being 1290 * allocated in a different memcg. 1291 */ 1292 if (*objects == 0) 1293 *objects = zfs_prune_aliases(zfsvfs, nr_to_scan); 1294 #endif 1295 1296 zfs_exit(zfsvfs, FTAG); 1297 1298 dprintf_ds(zfsvfs->z_os->os_dsl_dataset, 1299 "pruning, nr_to_scan=%lu objects=%d error=%d\n", 1300 nr_to_scan, *objects, error); 1301 1302 return (error); 1303 } 1304 1305 /* 1306 * Teardown the zfsvfs_t. 1307 * 1308 * Note, if 'unmounting' is FALSE, we return with the 'z_teardown_lock' 1309 * and 'z_teardown_inactive_lock' held. 1310 */ 1311 static int 1312 zfsvfs_teardown(zfsvfs_t *zfsvfs, boolean_t unmounting) 1313 { 1314 znode_t *zp; 1315 1316 zfs_unlinked_drain_stop_wait(zfsvfs); 1317 1318 /* 1319 * If someone has not already unmounted this file system, 1320 * drain the zrele_taskq to ensure all active references to the 1321 * zfsvfs_t have been handled only then can it be safely destroyed. 1322 */ 1323 if (zfsvfs->z_os) { 1324 /* 1325 * If we're unmounting we have to wait for the list to 1326 * drain completely. 1327 * 1328 * If we're not unmounting there's no guarantee the list 1329 * will drain completely, but iputs run from the taskq 1330 * may add the parents of dir-based xattrs to the taskq 1331 * so we want to wait for these. 1332 * 1333 * We can safely read z_nr_znodes without locking because the 1334 * VFS has already blocked operations which add to the 1335 * z_all_znodes list and thus increment z_nr_znodes. 1336 */ 1337 int round = 0; 1338 while (zfsvfs->z_nr_znodes > 0) { 1339 taskq_wait_outstanding(dsl_pool_zrele_taskq( 1340 dmu_objset_pool(zfsvfs->z_os)), 0); 1341 if (++round > 1 && !unmounting) 1342 break; 1343 } 1344 } 1345 1346 ZFS_TEARDOWN_ENTER_WRITE(zfsvfs, FTAG); 1347 1348 if (!unmounting) { 1349 /* 1350 * We purge the parent filesystem's super block as the 1351 * parent filesystem and all of its snapshots have their 1352 * inode's super block set to the parent's filesystem's 1353 * super block. Note, 'z_parent' is self referential 1354 * for non-snapshots. 1355 */ 1356 shrink_dcache_sb(zfsvfs->z_parent->z_sb); 1357 } 1358 1359 /* 1360 * Close the zil. NB: Can't close the zil while zfs_inactive 1361 * threads are blocked as zil_close can call zfs_inactive. 1362 */ 1363 if (zfsvfs->z_log) { 1364 zil_close(zfsvfs->z_log); 1365 zfsvfs->z_log = NULL; 1366 } 1367 1368 rw_enter(&zfsvfs->z_teardown_inactive_lock, RW_WRITER); 1369 1370 /* 1371 * If we are not unmounting (ie: online recv) and someone already 1372 * unmounted this file system while we were doing the switcheroo, 1373 * or a reopen of z_os failed then just bail out now. 1374 */ 1375 if (!unmounting && (zfsvfs->z_unmounted || zfsvfs->z_os == NULL)) { 1376 rw_exit(&zfsvfs->z_teardown_inactive_lock); 1377 ZFS_TEARDOWN_EXIT(zfsvfs, FTAG); 1378 return (SET_ERROR(EIO)); 1379 } 1380 1381 /* 1382 * At this point there are no VFS ops active, and any new VFS ops 1383 * will fail with EIO since we have z_teardown_lock for writer (only 1384 * relevant for forced unmount). 1385 * 1386 * Release all holds on dbufs. We also grab an extra reference to all 1387 * the remaining inodes so that the kernel does not attempt to free 1388 * any inodes of a suspended fs. This can cause deadlocks since the 1389 * zfs_resume_fs() process may involve starting threads, which might 1390 * attempt to free unreferenced inodes to free up memory for the new 1391 * thread. 1392 */ 1393 if (!unmounting) { 1394 mutex_enter(&zfsvfs->z_znodes_lock); 1395 for (zp = list_head(&zfsvfs->z_all_znodes); zp != NULL; 1396 zp = list_next(&zfsvfs->z_all_znodes, zp)) { 1397 if (zp->z_sa_hdl) 1398 zfs_znode_dmu_fini(zp); 1399 if (igrab(ZTOI(zp)) != NULL) 1400 zp->z_suspended = B_TRUE; 1401 1402 } 1403 mutex_exit(&zfsvfs->z_znodes_lock); 1404 } 1405 1406 /* 1407 * If we are unmounting, set the unmounted flag and let new VFS ops 1408 * unblock. zfs_inactive will have the unmounted behavior, and all 1409 * other VFS ops will fail with EIO. 1410 */ 1411 if (unmounting) { 1412 zfsvfs->z_unmounted = B_TRUE; 1413 rw_exit(&zfsvfs->z_teardown_inactive_lock); 1414 ZFS_TEARDOWN_EXIT(zfsvfs, FTAG); 1415 } 1416 1417 /* 1418 * z_os will be NULL if there was an error in attempting to reopen 1419 * zfsvfs, so just return as the properties had already been 1420 * 1421 * unregistered and cached data had been evicted before. 1422 */ 1423 if (zfsvfs->z_os == NULL) 1424 return (0); 1425 1426 /* 1427 * Unregister properties. 1428 */ 1429 zfs_unregister_callbacks(zfsvfs); 1430 1431 /* 1432 * Evict cached data. We must write out any dirty data before 1433 * disowning the dataset. 1434 */ 1435 objset_t *os = zfsvfs->z_os; 1436 boolean_t os_dirty = B_FALSE; 1437 for (int t = 0; t < TXG_SIZE; t++) { 1438 if (dmu_objset_is_dirty(os, t)) { 1439 os_dirty = B_TRUE; 1440 break; 1441 } 1442 } 1443 if (!zfs_is_readonly(zfsvfs) && os_dirty) { 1444 txg_wait_synced(dmu_objset_pool(zfsvfs->z_os), 0); 1445 } 1446 dmu_objset_evict_dbufs(zfsvfs->z_os); 1447 dsl_dir_t *dd = os->os_dsl_dataset->ds_dir; 1448 dsl_dir_cancel_waiters(dd); 1449 1450 return (0); 1451 } 1452 1453 #if defined(HAVE_SUPER_SETUP_BDI_NAME) 1454 atomic_long_t zfs_bdi_seq = ATOMIC_LONG_INIT(0); 1455 #endif 1456 1457 int 1458 zfs_domount(struct super_block *sb, zfs_mnt_t *zm, int silent) 1459 { 1460 const char *osname = zm->mnt_osname; 1461 struct inode *root_inode = NULL; 1462 uint64_t recordsize; 1463 int error = 0; 1464 zfsvfs_t *zfsvfs = NULL; 1465 vfs_t *vfs = NULL; 1466 int canwrite; 1467 int dataset_visible_zone; 1468 1469 ASSERT(zm); 1470 ASSERT(osname); 1471 1472 dataset_visible_zone = zone_dataset_visible(osname, &canwrite); 1473 1474 /* 1475 * Refuse to mount a filesystem if we are in a namespace and the 1476 * dataset is not visible or writable in that namespace. 1477 */ 1478 if (!INGLOBALZONE(curproc) && 1479 (!dataset_visible_zone || !canwrite)) { 1480 return (SET_ERROR(EPERM)); 1481 } 1482 1483 error = zfsvfs_parse_options(zm->mnt_data, &vfs); 1484 if (error) 1485 return (error); 1486 1487 /* 1488 * If a non-writable filesystem is being mounted without the 1489 * read-only flag, pretend it was set, as done for snapshots. 1490 */ 1491 if (!canwrite) 1492 vfs->vfs_readonly = true; 1493 1494 error = zfsvfs_create(osname, vfs->vfs_readonly, &zfsvfs); 1495 if (error) { 1496 zfsvfs_vfs_free(vfs); 1497 goto out; 1498 } 1499 1500 if ((error = dsl_prop_get_integer(osname, "recordsize", 1501 &recordsize, NULL))) { 1502 zfsvfs_vfs_free(vfs); 1503 goto out; 1504 } 1505 1506 vfs->vfs_data = zfsvfs; 1507 zfsvfs->z_vfs = vfs; 1508 zfsvfs->z_sb = sb; 1509 sb->s_fs_info = zfsvfs; 1510 sb->s_magic = ZFS_SUPER_MAGIC; 1511 sb->s_maxbytes = MAX_LFS_FILESIZE; 1512 sb->s_time_gran = 1; 1513 sb->s_blocksize = recordsize; 1514 sb->s_blocksize_bits = ilog2(recordsize); 1515 1516 error = -zpl_bdi_setup(sb, "zfs"); 1517 if (error) 1518 goto out; 1519 1520 sb->s_bdi->ra_pages = 0; 1521 1522 /* Set callback operations for the file system. */ 1523 sb->s_op = &zpl_super_operations; 1524 sb->s_xattr = zpl_xattr_handlers; 1525 sb->s_export_op = &zpl_export_operations; 1526 1527 /* Set features for file system. */ 1528 zfs_set_fuid_feature(zfsvfs); 1529 1530 if (dmu_objset_is_snapshot(zfsvfs->z_os)) { 1531 uint64_t pval; 1532 1533 atime_changed_cb(zfsvfs, B_FALSE); 1534 readonly_changed_cb(zfsvfs, B_TRUE); 1535 if ((error = dsl_prop_get_integer(osname, 1536 "xattr", &pval, NULL))) 1537 goto out; 1538 xattr_changed_cb(zfsvfs, pval); 1539 if ((error = dsl_prop_get_integer(osname, 1540 "acltype", &pval, NULL))) 1541 goto out; 1542 acltype_changed_cb(zfsvfs, pval); 1543 zfsvfs->z_issnap = B_TRUE; 1544 zfsvfs->z_os->os_sync = ZFS_SYNC_DISABLED; 1545 zfsvfs->z_snap_defer_time = jiffies; 1546 1547 mutex_enter(&zfsvfs->z_os->os_user_ptr_lock); 1548 dmu_objset_set_user(zfsvfs->z_os, zfsvfs); 1549 mutex_exit(&zfsvfs->z_os->os_user_ptr_lock); 1550 } else { 1551 if ((error = zfsvfs_setup(zfsvfs, B_TRUE))) 1552 goto out; 1553 } 1554 1555 /* Allocate a root inode for the filesystem. */ 1556 error = zfs_root(zfsvfs, &root_inode); 1557 if (error) { 1558 (void) zfs_umount(sb); 1559 zfsvfs = NULL; /* avoid double-free; first in zfs_umount */ 1560 goto out; 1561 } 1562 1563 /* Allocate a root dentry for the filesystem */ 1564 sb->s_root = d_make_root(root_inode); 1565 if (sb->s_root == NULL) { 1566 (void) zfs_umount(sb); 1567 zfsvfs = NULL; /* avoid double-free; first in zfs_umount */ 1568 error = SET_ERROR(ENOMEM); 1569 goto out; 1570 } 1571 1572 if (!zfsvfs->z_issnap) 1573 zfsctl_create(zfsvfs); 1574 1575 zfsvfs->z_arc_prune = arc_add_prune_callback(zpl_prune_sb, sb); 1576 out: 1577 if (error) { 1578 if (zfsvfs != NULL) { 1579 dmu_objset_disown(zfsvfs->z_os, B_TRUE, zfsvfs); 1580 zfsvfs_free(zfsvfs); 1581 } 1582 /* 1583 * make sure we don't have dangling sb->s_fs_info which 1584 * zfs_preumount will use. 1585 */ 1586 sb->s_fs_info = NULL; 1587 } 1588 1589 return (error); 1590 } 1591 1592 /* 1593 * Called when an unmount is requested and certain sanity checks have 1594 * already passed. At this point no dentries or inodes have been reclaimed 1595 * from their respective caches. We drop the extra reference on the .zfs 1596 * control directory to allow everything to be reclaimed. All snapshots 1597 * must already have been unmounted to reach this point. 1598 */ 1599 void 1600 zfs_preumount(struct super_block *sb) 1601 { 1602 zfsvfs_t *zfsvfs = sb->s_fs_info; 1603 1604 /* zfsvfs is NULL when zfs_domount fails during mount */ 1605 if (zfsvfs) { 1606 zfs_unlinked_drain_stop_wait(zfsvfs); 1607 zfsctl_destroy(sb->s_fs_info); 1608 /* 1609 * Wait for zrele_async before entering evict_inodes in 1610 * generic_shutdown_super. The reason we must finish before 1611 * evict_inodes is when lazytime is on, or when zfs_purgedir 1612 * calls zfs_zget, zrele would bump i_count from 0 to 1. This 1613 * would race with the i_count check in evict_inodes. This means 1614 * it could destroy the inode while we are still using it. 1615 * 1616 * We wait for two passes. xattr directories in the first pass 1617 * may add xattr entries in zfs_purgedir, so in the second pass 1618 * we wait for them. We don't use taskq_wait here because it is 1619 * a pool wide taskq. Other mounted filesystems can constantly 1620 * do zrele_async and there's no guarantee when taskq will be 1621 * empty. 1622 */ 1623 taskq_wait_outstanding(dsl_pool_zrele_taskq( 1624 dmu_objset_pool(zfsvfs->z_os)), 0); 1625 taskq_wait_outstanding(dsl_pool_zrele_taskq( 1626 dmu_objset_pool(zfsvfs->z_os)), 0); 1627 } 1628 } 1629 1630 /* 1631 * Called once all other unmount released tear down has occurred. 1632 * It is our responsibility to release any remaining infrastructure. 1633 */ 1634 int 1635 zfs_umount(struct super_block *sb) 1636 { 1637 zfsvfs_t *zfsvfs = sb->s_fs_info; 1638 objset_t *os; 1639 1640 if (zfsvfs->z_arc_prune != NULL) 1641 arc_remove_prune_callback(zfsvfs->z_arc_prune); 1642 VERIFY(zfsvfs_teardown(zfsvfs, B_TRUE) == 0); 1643 os = zfsvfs->z_os; 1644 zpl_bdi_destroy(sb); 1645 1646 /* 1647 * z_os will be NULL if there was an error in 1648 * attempting to reopen zfsvfs. 1649 */ 1650 if (os != NULL) { 1651 /* 1652 * Unset the objset user_ptr. 1653 */ 1654 mutex_enter(&os->os_user_ptr_lock); 1655 dmu_objset_set_user(os, NULL); 1656 mutex_exit(&os->os_user_ptr_lock); 1657 1658 /* 1659 * Finally release the objset 1660 */ 1661 dmu_objset_disown(os, B_TRUE, zfsvfs); 1662 } 1663 1664 zfsvfs_free(zfsvfs); 1665 sb->s_fs_info = NULL; 1666 return (0); 1667 } 1668 1669 int 1670 zfs_remount(struct super_block *sb, int *flags, zfs_mnt_t *zm) 1671 { 1672 zfsvfs_t *zfsvfs = sb->s_fs_info; 1673 vfs_t *vfsp; 1674 boolean_t issnap = dmu_objset_is_snapshot(zfsvfs->z_os); 1675 int error; 1676 1677 if ((issnap || !spa_writeable(dmu_objset_spa(zfsvfs->z_os))) && 1678 !(*flags & SB_RDONLY)) { 1679 *flags |= SB_RDONLY; 1680 return (EROFS); 1681 } 1682 1683 error = zfsvfs_parse_options(zm->mnt_data, &vfsp); 1684 if (error) 1685 return (error); 1686 1687 if (!zfs_is_readonly(zfsvfs) && (*flags & SB_RDONLY)) 1688 txg_wait_synced(dmu_objset_pool(zfsvfs->z_os), 0); 1689 1690 zfs_unregister_callbacks(zfsvfs); 1691 zfsvfs_vfs_free(zfsvfs->z_vfs); 1692 1693 vfsp->vfs_data = zfsvfs; 1694 zfsvfs->z_vfs = vfsp; 1695 if (!issnap) 1696 (void) zfs_register_callbacks(vfsp); 1697 1698 return (error); 1699 } 1700 1701 int 1702 zfs_vget(struct super_block *sb, struct inode **ipp, fid_t *fidp) 1703 { 1704 zfsvfs_t *zfsvfs = sb->s_fs_info; 1705 znode_t *zp; 1706 uint64_t object = 0; 1707 uint64_t fid_gen = 0; 1708 uint64_t gen_mask; 1709 uint64_t zp_gen; 1710 int i, err; 1711 1712 *ipp = NULL; 1713 1714 if (fidp->fid_len == SHORT_FID_LEN || fidp->fid_len == LONG_FID_LEN) { 1715 zfid_short_t *zfid = (zfid_short_t *)fidp; 1716 1717 for (i = 0; i < sizeof (zfid->zf_object); i++) 1718 object |= ((uint64_t)zfid->zf_object[i]) << (8 * i); 1719 1720 for (i = 0; i < sizeof (zfid->zf_gen); i++) 1721 fid_gen |= ((uint64_t)zfid->zf_gen[i]) << (8 * i); 1722 } else { 1723 return (SET_ERROR(EINVAL)); 1724 } 1725 1726 /* LONG_FID_LEN means snapdirs */ 1727 if (fidp->fid_len == LONG_FID_LEN) { 1728 zfid_long_t *zlfid = (zfid_long_t *)fidp; 1729 uint64_t objsetid = 0; 1730 uint64_t setgen = 0; 1731 1732 for (i = 0; i < sizeof (zlfid->zf_setid); i++) 1733 objsetid |= ((uint64_t)zlfid->zf_setid[i]) << (8 * i); 1734 1735 for (i = 0; i < sizeof (zlfid->zf_setgen); i++) 1736 setgen |= ((uint64_t)zlfid->zf_setgen[i]) << (8 * i); 1737 1738 if (objsetid != ZFSCTL_INO_SNAPDIRS - object) { 1739 dprintf("snapdir fid: objsetid (%llu) != " 1740 "ZFSCTL_INO_SNAPDIRS (%llu) - object (%llu)\n", 1741 objsetid, ZFSCTL_INO_SNAPDIRS, object); 1742 1743 return (SET_ERROR(EINVAL)); 1744 } 1745 1746 if (fid_gen > 1 || setgen != 0) { 1747 dprintf("snapdir fid: fid_gen (%llu) and setgen " 1748 "(%llu)\n", fid_gen, setgen); 1749 return (SET_ERROR(EINVAL)); 1750 } 1751 1752 return (zfsctl_snapdir_vget(sb, objsetid, fid_gen, ipp)); 1753 } 1754 1755 if ((err = zfs_enter(zfsvfs, FTAG)) != 0) 1756 return (err); 1757 /* A zero fid_gen means we are in the .zfs control directories */ 1758 if (fid_gen == 0 && 1759 (object == ZFSCTL_INO_ROOT || object == ZFSCTL_INO_SNAPDIR)) { 1760 *ipp = zfsvfs->z_ctldir; 1761 ASSERT(*ipp != NULL); 1762 if (object == ZFSCTL_INO_SNAPDIR) { 1763 VERIFY(zfsctl_root_lookup(*ipp, "snapshot", ipp, 1764 0, kcred, NULL, NULL) == 0); 1765 } else { 1766 /* 1767 * Must have an existing ref, so igrab() 1768 * cannot return NULL 1769 */ 1770 VERIFY3P(igrab(*ipp), !=, NULL); 1771 } 1772 zfs_exit(zfsvfs, FTAG); 1773 return (0); 1774 } 1775 1776 gen_mask = -1ULL >> (64 - 8 * i); 1777 1778 dprintf("getting %llu [%llu mask %llx]\n", object, fid_gen, gen_mask); 1779 if ((err = zfs_zget(zfsvfs, object, &zp))) { 1780 zfs_exit(zfsvfs, FTAG); 1781 return (err); 1782 } 1783 1784 /* Don't export xattr stuff */ 1785 if (zp->z_pflags & ZFS_XATTR) { 1786 zrele(zp); 1787 zfs_exit(zfsvfs, FTAG); 1788 return (SET_ERROR(ENOENT)); 1789 } 1790 1791 (void) sa_lookup(zp->z_sa_hdl, SA_ZPL_GEN(zfsvfs), &zp_gen, 1792 sizeof (uint64_t)); 1793 zp_gen = zp_gen & gen_mask; 1794 if (zp_gen == 0) 1795 zp_gen = 1; 1796 if ((fid_gen == 0) && (zfsvfs->z_root == object)) 1797 fid_gen = zp_gen; 1798 if (zp->z_unlinked || zp_gen != fid_gen) { 1799 dprintf("znode gen (%llu) != fid gen (%llu)\n", zp_gen, 1800 fid_gen); 1801 zrele(zp); 1802 zfs_exit(zfsvfs, FTAG); 1803 return (SET_ERROR(ENOENT)); 1804 } 1805 1806 *ipp = ZTOI(zp); 1807 if (*ipp) 1808 zfs_znode_update_vfs(ITOZ(*ipp)); 1809 1810 zfs_exit(zfsvfs, FTAG); 1811 return (0); 1812 } 1813 1814 /* 1815 * Block out VFS ops and close zfsvfs_t 1816 * 1817 * Note, if successful, then we return with the 'z_teardown_lock' and 1818 * 'z_teardown_inactive_lock' write held. We leave ownership of the underlying 1819 * dataset and objset intact so that they can be atomically handed off during 1820 * a subsequent rollback or recv operation and the resume thereafter. 1821 */ 1822 int 1823 zfs_suspend_fs(zfsvfs_t *zfsvfs) 1824 { 1825 int error; 1826 1827 if ((error = zfsvfs_teardown(zfsvfs, B_FALSE)) != 0) 1828 return (error); 1829 1830 return (0); 1831 } 1832 1833 /* 1834 * Rebuild SA and release VOPs. Note that ownership of the underlying dataset 1835 * is an invariant across any of the operations that can be performed while the 1836 * filesystem was suspended. Whether it succeeded or failed, the preconditions 1837 * are the same: the relevant objset and associated dataset are owned by 1838 * zfsvfs, held, and long held on entry. 1839 */ 1840 int 1841 zfs_resume_fs(zfsvfs_t *zfsvfs, dsl_dataset_t *ds) 1842 { 1843 int err, err2; 1844 znode_t *zp; 1845 1846 ASSERT(ZFS_TEARDOWN_WRITE_HELD(zfsvfs)); 1847 ASSERT(RW_WRITE_HELD(&zfsvfs->z_teardown_inactive_lock)); 1848 1849 /* 1850 * We already own this, so just update the objset_t, as the one we 1851 * had before may have been evicted. 1852 */ 1853 objset_t *os; 1854 VERIFY3P(ds->ds_owner, ==, zfsvfs); 1855 VERIFY(dsl_dataset_long_held(ds)); 1856 dsl_pool_t *dp = spa_get_dsl(dsl_dataset_get_spa(ds)); 1857 dsl_pool_config_enter(dp, FTAG); 1858 VERIFY0(dmu_objset_from_ds(ds, &os)); 1859 dsl_pool_config_exit(dp, FTAG); 1860 1861 err = zfsvfs_init(zfsvfs, os); 1862 if (err != 0) 1863 goto bail; 1864 1865 ds->ds_dir->dd_activity_cancelled = B_FALSE; 1866 VERIFY(zfsvfs_setup(zfsvfs, B_FALSE) == 0); 1867 1868 zfs_set_fuid_feature(zfsvfs); 1869 zfsvfs->z_rollback_time = jiffies; 1870 1871 /* 1872 * Attempt to re-establish all the active inodes with their 1873 * dbufs. If a zfs_rezget() fails, then we unhash the inode 1874 * and mark it stale. This prevents a collision if a new 1875 * inode/object is created which must use the same inode 1876 * number. The stale inode will be be released when the 1877 * VFS prunes the dentry holding the remaining references 1878 * on the stale inode. 1879 */ 1880 mutex_enter(&zfsvfs->z_znodes_lock); 1881 for (zp = list_head(&zfsvfs->z_all_znodes); zp; 1882 zp = list_next(&zfsvfs->z_all_znodes, zp)) { 1883 err2 = zfs_rezget(zp); 1884 if (err2) { 1885 zpl_d_drop_aliases(ZTOI(zp)); 1886 remove_inode_hash(ZTOI(zp)); 1887 } 1888 1889 /* see comment in zfs_suspend_fs() */ 1890 if (zp->z_suspended) { 1891 zfs_zrele_async(zp); 1892 zp->z_suspended = B_FALSE; 1893 } 1894 } 1895 mutex_exit(&zfsvfs->z_znodes_lock); 1896 1897 if (!zfs_is_readonly(zfsvfs) && !zfsvfs->z_unmounted) { 1898 /* 1899 * zfs_suspend_fs() could have interrupted freeing 1900 * of dnodes. We need to restart this freeing so 1901 * that we don't "leak" the space. 1902 */ 1903 zfs_unlinked_drain(zfsvfs); 1904 } 1905 1906 /* 1907 * Most of the time zfs_suspend_fs is used for changing the contents 1908 * of the underlying dataset. ZFS rollback and receive operations 1909 * might create files for which negative dentries are present in 1910 * the cache. Since walking the dcache would require a lot of GPL-only 1911 * code duplication, it's much easier on these rather rare occasions 1912 * just to flush the whole dcache for the given dataset/filesystem. 1913 */ 1914 shrink_dcache_sb(zfsvfs->z_sb); 1915 1916 bail: 1917 if (err != 0) 1918 zfsvfs->z_unmounted = B_TRUE; 1919 1920 /* release the VFS ops */ 1921 rw_exit(&zfsvfs->z_teardown_inactive_lock); 1922 ZFS_TEARDOWN_EXIT(zfsvfs, FTAG); 1923 1924 if (err != 0) { 1925 /* 1926 * Since we couldn't setup the sa framework, try to force 1927 * unmount this file system. 1928 */ 1929 if (zfsvfs->z_os) 1930 (void) zfs_umount(zfsvfs->z_sb); 1931 } 1932 return (err); 1933 } 1934 1935 /* 1936 * Release VOPs and unmount a suspended filesystem. 1937 */ 1938 int 1939 zfs_end_fs(zfsvfs_t *zfsvfs, dsl_dataset_t *ds) 1940 { 1941 ASSERT(ZFS_TEARDOWN_WRITE_HELD(zfsvfs)); 1942 ASSERT(RW_WRITE_HELD(&zfsvfs->z_teardown_inactive_lock)); 1943 1944 /* 1945 * We already own this, so just hold and rele it to update the 1946 * objset_t, as the one we had before may have been evicted. 1947 */ 1948 objset_t *os; 1949 VERIFY3P(ds->ds_owner, ==, zfsvfs); 1950 VERIFY(dsl_dataset_long_held(ds)); 1951 dsl_pool_t *dp = spa_get_dsl(dsl_dataset_get_spa(ds)); 1952 dsl_pool_config_enter(dp, FTAG); 1953 VERIFY0(dmu_objset_from_ds(ds, &os)); 1954 dsl_pool_config_exit(dp, FTAG); 1955 zfsvfs->z_os = os; 1956 1957 /* release the VOPs */ 1958 rw_exit(&zfsvfs->z_teardown_inactive_lock); 1959 ZFS_TEARDOWN_EXIT(zfsvfs, FTAG); 1960 1961 /* 1962 * Try to force unmount this file system. 1963 */ 1964 (void) zfs_umount(zfsvfs->z_sb); 1965 zfsvfs->z_unmounted = B_TRUE; 1966 return (0); 1967 } 1968 1969 /* 1970 * Automounted snapshots rely on periodic revalidation 1971 * to defer snapshots from being automatically unmounted. 1972 */ 1973 1974 inline void 1975 zfs_exit_fs(zfsvfs_t *zfsvfs) 1976 { 1977 if (!zfsvfs->z_issnap) 1978 return; 1979 1980 if (time_after(jiffies, zfsvfs->z_snap_defer_time + 1981 MAX(zfs_expire_snapshot * HZ / 2, HZ))) { 1982 zfsvfs->z_snap_defer_time = jiffies; 1983 zfsctl_snapshot_unmount_delay(zfsvfs->z_os->os_spa, 1984 dmu_objset_id(zfsvfs->z_os), 1985 zfs_expire_snapshot); 1986 } 1987 } 1988 1989 int 1990 zfs_set_version(zfsvfs_t *zfsvfs, uint64_t newvers) 1991 { 1992 int error; 1993 objset_t *os = zfsvfs->z_os; 1994 dmu_tx_t *tx; 1995 1996 if (newvers < ZPL_VERSION_INITIAL || newvers > ZPL_VERSION) 1997 return (SET_ERROR(EINVAL)); 1998 1999 if (newvers < zfsvfs->z_version) 2000 return (SET_ERROR(EINVAL)); 2001 2002 if (zfs_spa_version_map(newvers) > 2003 spa_version(dmu_objset_spa(zfsvfs->z_os))) 2004 return (SET_ERROR(ENOTSUP)); 2005 2006 tx = dmu_tx_create(os); 2007 dmu_tx_hold_zap(tx, MASTER_NODE_OBJ, B_FALSE, ZPL_VERSION_STR); 2008 if (newvers >= ZPL_VERSION_SA && !zfsvfs->z_use_sa) { 2009 dmu_tx_hold_zap(tx, MASTER_NODE_OBJ, B_TRUE, 2010 ZFS_SA_ATTRS); 2011 dmu_tx_hold_zap(tx, DMU_NEW_OBJECT, FALSE, NULL); 2012 } 2013 error = dmu_tx_assign(tx, TXG_WAIT); 2014 if (error) { 2015 dmu_tx_abort(tx); 2016 return (error); 2017 } 2018 2019 error = zap_update(os, MASTER_NODE_OBJ, ZPL_VERSION_STR, 2020 8, 1, &newvers, tx); 2021 2022 if (error) { 2023 dmu_tx_commit(tx); 2024 return (error); 2025 } 2026 2027 if (newvers >= ZPL_VERSION_SA && !zfsvfs->z_use_sa) { 2028 uint64_t sa_obj; 2029 2030 ASSERT3U(spa_version(dmu_objset_spa(zfsvfs->z_os)), >=, 2031 SPA_VERSION_SA); 2032 sa_obj = zap_create(os, DMU_OT_SA_MASTER_NODE, 2033 DMU_OT_NONE, 0, tx); 2034 2035 error = zap_add(os, MASTER_NODE_OBJ, 2036 ZFS_SA_ATTRS, 8, 1, &sa_obj, tx); 2037 ASSERT0(error); 2038 2039 VERIFY(0 == sa_set_sa_object(os, sa_obj)); 2040 sa_register_update_callback(os, zfs_sa_upgrade); 2041 } 2042 2043 spa_history_log_internal_ds(dmu_objset_ds(os), "upgrade", tx, 2044 "from %llu to %llu", zfsvfs->z_version, newvers); 2045 2046 dmu_tx_commit(tx); 2047 2048 zfsvfs->z_version = newvers; 2049 os->os_version = newvers; 2050 2051 zfs_set_fuid_feature(zfsvfs); 2052 2053 return (0); 2054 } 2055 2056 /* 2057 * Return true if the corresponding vfs's unmounted flag is set. 2058 * Otherwise return false. 2059 * If this function returns true we know VFS unmount has been initiated. 2060 */ 2061 boolean_t 2062 zfs_get_vfs_flag_unmounted(objset_t *os) 2063 { 2064 zfsvfs_t *zfvp; 2065 boolean_t unmounted = B_FALSE; 2066 2067 ASSERT(dmu_objset_type(os) == DMU_OST_ZFS); 2068 2069 mutex_enter(&os->os_user_ptr_lock); 2070 zfvp = dmu_objset_get_user(os); 2071 if (zfvp != NULL && zfvp->z_unmounted) 2072 unmounted = B_TRUE; 2073 mutex_exit(&os->os_user_ptr_lock); 2074 2075 return (unmounted); 2076 } 2077 2078 void 2079 zfsvfs_update_fromname(const char *oldname, const char *newname) 2080 { 2081 /* 2082 * We don't need to do anything here, the devname is always current by 2083 * virtue of zfsvfs->z_sb->s_op->show_devname. 2084 */ 2085 (void) oldname, (void) newname; 2086 } 2087 2088 void 2089 zfs_init(void) 2090 { 2091 zfsctl_init(); 2092 zfs_znode_init(); 2093 dmu_objset_register_type(DMU_OST_ZFS, zpl_get_file_info); 2094 register_filesystem(&zpl_fs_type); 2095 #ifdef HAVE_VFS_FILE_OPERATIONS_EXTEND 2096 register_fo_extend(&zpl_file_operations); 2097 #endif 2098 } 2099 2100 void 2101 zfs_fini(void) 2102 { 2103 /* 2104 * we don't use outstanding because zpl_posix_acl_free might add more. 2105 */ 2106 taskq_wait(system_delay_taskq); 2107 taskq_wait(system_taskq); 2108 #ifdef HAVE_VFS_FILE_OPERATIONS_EXTEND 2109 unregister_fo_extend(&zpl_file_operations); 2110 #endif 2111 unregister_filesystem(&zpl_fs_type); 2112 zfs_znode_fini(); 2113 zfsctl_fini(); 2114 } 2115 2116 #if defined(_KERNEL) 2117 EXPORT_SYMBOL(zfs_suspend_fs); 2118 EXPORT_SYMBOL(zfs_resume_fs); 2119 EXPORT_SYMBOL(zfs_set_version); 2120 EXPORT_SYMBOL(zfsvfs_create); 2121 EXPORT_SYMBOL(zfsvfs_free); 2122 EXPORT_SYMBOL(zfs_is_readonly); 2123 EXPORT_SYMBOL(zfs_domount); 2124 EXPORT_SYMBOL(zfs_preumount); 2125 EXPORT_SYMBOL(zfs_umount); 2126 EXPORT_SYMBOL(zfs_remount); 2127 EXPORT_SYMBOL(zfs_statvfs); 2128 EXPORT_SYMBOL(zfs_vget); 2129 EXPORT_SYMBOL(zfs_prune); 2130 #endif 2131