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, 2024 by Delphix. All rights reserved. 24 * Copyright 2016 RackTop Systems. 25 * Copyright (c) 2017, Intel Corporation. 26 * Copyright (c) 2024, Klara, Inc. 27 */ 28 29 #ifndef _SYS_ZFS_IOCTL_H 30 #define _SYS_ZFS_IOCTL_H 31 32 #include <sys/cred.h> 33 #include <sys/dmu.h> 34 #include <sys/zio.h> 35 #include <sys/dsl_deleg.h> 36 #include <sys/spa.h> 37 #include <sys/zfs_stat.h> 38 39 #ifdef _KERNEL 40 #include <sys/nvpair.h> 41 #endif /* _KERNEL */ 42 43 #ifdef __cplusplus 44 extern "C" { 45 #endif 46 47 /* 48 * The structures in this file are passed between userland and the 49 * kernel. Userland may be running a 32-bit process, while the kernel 50 * is 64-bit. Therefore, these structures need to compile the same in 51 * 32-bit and 64-bit. This means not using type "long", and adding 52 * explicit padding so that the 32-bit structure will not be packed more 53 * tightly than the 64-bit structure (which requires 64-bit alignment). 54 */ 55 56 /* 57 * Property values for snapdir 58 */ 59 #define ZFS_SNAPDIR_HIDDEN 0 60 #define ZFS_SNAPDIR_VISIBLE 1 61 #define ZFS_SNAPDIR_DISABLED 2 62 63 /* 64 * Property values for snapdev 65 */ 66 #define ZFS_SNAPDEV_HIDDEN 0 67 #define ZFS_SNAPDEV_VISIBLE 1 68 /* 69 * Property values for acltype 70 */ 71 #define ZFS_ACLTYPE_OFF 0 72 #define ZFS_ACLTYPE_POSIX 1 73 #define ZFS_ACLTYPE_NFSV4 2 74 75 /* 76 * The drr_versioninfo field of the dmu_replay_record has the 77 * following layout: 78 * 79 * 64 56 48 40 32 24 16 8 0 80 * +-------+-------+-------+-------+-------+-------+-------+-------+ 81 * |reserve| feature-flags |C|S| 82 * +-------+-------+-------+-------+-------+-------+-------+-------+ 83 * 84 * The low order two bits indicate the header type: SUBSTREAM (0x1) 85 * or COMPOUNDSTREAM (0x2). Using two bits for this is historical: 86 * this field used to be a version number, where the two version types 87 * were 1 and 2. Using two bits for this allows earlier versions of 88 * the code to be able to recognize send streams that don't use any 89 * of the features indicated by feature flags. 90 * 91 * The top 8 bits are reserved for future expansion. At time of writing there 92 * are no plans for these. If you want to use them, please reach out to the 93 * OpenZFS community, e.g., on GitHub or Slack. 94 */ 95 96 /* 97 * Field manipulation macros for the drr_versioninfo field of the 98 * send stream header. 99 */ 100 #define DMU_GET_STREAM_HDRTYPE(vi) BF64_GET((vi), 0, 2) 101 #define DMU_SET_STREAM_HDRTYPE(vi, x) BF64_SET((vi), 0, 2, x) 102 103 #define DMU_GET_FEATUREFLAGS(vi) BF64_GET((vi), 2, 56) 104 #define DMU_SET_FEATUREFLAGS(vi, x) BF64_SET((vi), 2, 56, x) 105 106 /* 107 * Header types for zfs send streams. 108 */ 109 typedef enum drr_headertype { 110 DMU_SUBSTREAM = 0x1, 111 DMU_COMPOUNDSTREAM = 0x2 112 } drr_headertype_t; 113 114 /* 115 * Feature flags for zfs send streams (flags in drr_versioninfo) 116 */ 117 #define DMU_BACKUP_FEATURE_DEDUP (1 << 0) 118 #define DMU_BACKUP_FEATURE_DEDUPPROPS (1 << 1) 119 #define DMU_BACKUP_FEATURE_SA_SPILL (1 << 2) 120 /* flags #3 - #15 are reserved for incompatible closed-source implementations */ 121 #define DMU_BACKUP_FEATURE_EMBED_DATA (1 << 16) 122 #define DMU_BACKUP_FEATURE_LZ4 (1 << 17) 123 /* flag #18 is reserved for a Delphix feature */ 124 #define DMU_BACKUP_FEATURE_LARGE_BLOCKS (1 << 19) 125 #define DMU_BACKUP_FEATURE_RESUMING (1 << 20) 126 #define DMU_BACKUP_FEATURE_REDACTED (1 << 21) 127 #define DMU_BACKUP_FEATURE_COMPRESSED (1 << 22) 128 #define DMU_BACKUP_FEATURE_LARGE_DNODE (1 << 23) 129 #define DMU_BACKUP_FEATURE_RAW (1 << 24) 130 #define DMU_BACKUP_FEATURE_ZSTD (1 << 25) 131 #define DMU_BACKUP_FEATURE_HOLDS (1 << 26) 132 /* 133 * The SWITCH_TO_LARGE_BLOCKS feature indicates that we can receive 134 * incremental LARGE_BLOCKS streams (those with WRITE records of >128KB) even 135 * if the previous send did not use LARGE_BLOCKS, and thus its large blocks 136 * were split into multiple 128KB WRITE records. (See 137 * flush_write_batch_impl() and receive_object()). Older software that does 138 * not support this flag may encounter a bug when switching to large blocks, 139 * which causes files to incorrectly be zeroed. 140 * 141 * This flag is currently not set on any send streams. In the future, we 142 * intend for incremental send streams of snapshots that have large blocks to 143 * use LARGE_BLOCKS by default, and these streams will also have the 144 * SWITCH_TO_LARGE_BLOCKS feature set. This ensures that streams from the 145 * default use of "zfs send" won't encounter the bug mentioned above. 146 */ 147 #define DMU_BACKUP_FEATURE_SWITCH_TO_LARGE_BLOCKS (1 << 27) 148 #define DMU_BACKUP_FEATURE_LONGNAME (1 << 28) 149 #define DMU_BACKUP_FEATURE_LARGE_MICROZAP (1 << 29) 150 151 /* 152 * Mask of all supported backup features 153 */ 154 #define DMU_BACKUP_FEATURE_MASK (DMU_BACKUP_FEATURE_SA_SPILL | \ 155 DMU_BACKUP_FEATURE_EMBED_DATA | DMU_BACKUP_FEATURE_LZ4 | \ 156 DMU_BACKUP_FEATURE_RESUMING | DMU_BACKUP_FEATURE_LARGE_BLOCKS | \ 157 DMU_BACKUP_FEATURE_COMPRESSED | DMU_BACKUP_FEATURE_LARGE_DNODE | \ 158 DMU_BACKUP_FEATURE_RAW | DMU_BACKUP_FEATURE_HOLDS | \ 159 DMU_BACKUP_FEATURE_REDACTED | DMU_BACKUP_FEATURE_SWITCH_TO_LARGE_BLOCKS | \ 160 DMU_BACKUP_FEATURE_ZSTD | DMU_BACKUP_FEATURE_LONGNAME | \ 161 DMU_BACKUP_FEATURE_LARGE_MICROZAP) 162 163 /* Are all features in the given flag word currently supported? */ 164 #define DMU_STREAM_SUPPORTED(x) (!((x) & ~DMU_BACKUP_FEATURE_MASK)) 165 166 typedef enum dmu_send_resume_token_version { 167 ZFS_SEND_RESUME_TOKEN_VERSION = 1 168 } dmu_send_resume_token_version_t; 169 170 #define DMU_BACKUP_MAGIC 0x2F5bacbacULL 171 172 /* 173 * Send stream flags. Bits 24-31 are reserved for vendor-specific 174 * implementations and should not be used. 175 */ 176 #define DRR_FLAG_CLONE (1<<0) 177 #define DRR_FLAG_CI_DATA (1<<1) 178 /* 179 * This send stream, if it is a full send, includes the FREE and FREEOBJECT 180 * records that are created by the sending process. This means that the send 181 * stream can be received as a clone, even though it is not an incremental. 182 * This is not implemented as a feature flag, because the receiving side does 183 * not need to have implemented it to receive this stream; it is fully backwards 184 * compatible. We need a flag, though, because full send streams without it 185 * cannot necessarily be received as a clone correctly. 186 */ 187 #define DRR_FLAG_FREERECORDS (1<<2) 188 /* 189 * When DRR_FLAG_SPILL_BLOCK is set it indicates the DRR_OBJECT_SPILL 190 * and DRR_SPILL_UNMODIFIED flags are meaningful in the send stream. 191 * 192 * When DRR_FLAG_SPILL_BLOCK is set, DRR_OBJECT records will have 193 * DRR_OBJECT_SPILL set if and only if they should have a spill block 194 * (either an existing one, or a new one in the send stream). When clear 195 * the object does not have a spill block and any existing spill block 196 * should be freed. 197 * 198 * Similarly, when DRR_FLAG_SPILL_BLOCK is set, DRR_SPILL records will 199 * have DRR_SPILL_UNMODIFIED set if and only if they were included for 200 * backward compatibility purposes, and can be safely ignored by new versions 201 * of zfs receive. Previous versions of ZFS which do not understand the 202 * DRR_FLAG_SPILL_BLOCK will process this record and recreate any missing 203 * spill blocks. 204 */ 205 #define DRR_FLAG_SPILL_BLOCK (1<<3) 206 207 /* 208 * flags in the drr_flags field in the DRR_WRITE, DRR_SPILL, DRR_OBJECT, 209 * DRR_WRITE_BYREF, and DRR_OBJECT_RANGE blocks 210 */ 211 #define DRR_CHECKSUM_DEDUP (1<<0) /* not used for SPILL records */ 212 #define DRR_RAW_BYTESWAP (1<<1) 213 #define DRR_OBJECT_SPILL (1<<2) /* OBJECT record has a spill block */ 214 #define DRR_SPILL_UNMODIFIED (1<<2) /* SPILL record for unmodified block */ 215 216 #define DRR_IS_DEDUP_CAPABLE(flags) ((flags) & DRR_CHECKSUM_DEDUP) 217 #define DRR_IS_RAW_BYTESWAPPED(flags) ((flags) & DRR_RAW_BYTESWAP) 218 #define DRR_OBJECT_HAS_SPILL(flags) ((flags) & DRR_OBJECT_SPILL) 219 #define DRR_SPILL_IS_UNMODIFIED(flags) ((flags) & DRR_SPILL_UNMODIFIED) 220 221 /* deal with compressed drr_write replay records */ 222 #define DRR_WRITE_COMPRESSED(drrw) ((drrw)->drr_compressiontype != 0) 223 #define DRR_WRITE_PAYLOAD_SIZE(drrw) \ 224 (DRR_WRITE_COMPRESSED(drrw) ? (drrw)->drr_compressed_size : \ 225 (drrw)->drr_logical_size) 226 #define DRR_SPILL_PAYLOAD_SIZE(drrs) \ 227 ((drrs)->drr_compressed_size ? \ 228 (drrs)->drr_compressed_size : (drrs)->drr_length) 229 #define DRR_OBJECT_PAYLOAD_SIZE(drro) \ 230 ((drro)->drr_raw_bonuslen != 0 ? \ 231 (drro)->drr_raw_bonuslen : P2ROUNDUP((drro)->drr_bonuslen, 8)) 232 233 /* Header is used in C++ so can't forward declare untagged struct */ 234 struct drr_begin { 235 uint64_t drr_magic; 236 uint64_t drr_versioninfo; /* was drr_version */ 237 uint64_t drr_creation_time; 238 dmu_objset_type_t drr_type; 239 uint32_t drr_flags; 240 uint64_t drr_toguid; 241 uint64_t drr_fromguid; 242 char drr_toname[MAXNAMELEN]; 243 }; 244 245 typedef struct dmu_replay_record { 246 enum { 247 DRR_BEGIN, DRR_OBJECT, DRR_FREEOBJECTS, 248 DRR_WRITE, DRR_FREE, DRR_END, DRR_WRITE_BYREF, 249 DRR_SPILL, DRR_WRITE_EMBEDDED, DRR_OBJECT_RANGE, DRR_REDACT, 250 DRR_NUMTYPES 251 } drr_type; 252 uint32_t drr_payloadlen; 253 union { 254 struct drr_begin drr_begin; 255 struct drr_end { 256 zio_cksum_t drr_checksum; 257 uint64_t drr_toguid; 258 } drr_end; 259 struct drr_object { 260 uint64_t drr_object; 261 dmu_object_type_t drr_type; 262 dmu_object_type_t drr_bonustype; 263 uint32_t drr_blksz; 264 uint32_t drr_bonuslen; 265 uint8_t drr_checksumtype; 266 uint8_t drr_compress; 267 uint8_t drr_dn_slots; 268 uint8_t drr_flags; 269 uint32_t drr_raw_bonuslen; 270 uint64_t drr_toguid; 271 /* only (possibly) nonzero for raw streams */ 272 uint8_t drr_indblkshift; 273 uint8_t drr_nlevels; 274 uint8_t drr_nblkptr; 275 uint8_t drr_pad[5]; 276 uint64_t drr_maxblkid; 277 /* bonus content follows */ 278 } drr_object; 279 struct drr_freeobjects { 280 uint64_t drr_firstobj; 281 uint64_t drr_numobjs; 282 uint64_t drr_toguid; 283 } drr_freeobjects; 284 struct drr_write { 285 uint64_t drr_object; 286 dmu_object_type_t drr_type; 287 uint32_t drr_pad; 288 uint64_t drr_offset; 289 uint64_t drr_logical_size; 290 uint64_t drr_toguid; 291 uint8_t drr_checksumtype; 292 uint8_t drr_flags; 293 uint8_t drr_compressiontype; 294 uint8_t drr_pad2[5]; 295 /* deduplication key */ 296 ddt_key_t drr_key; 297 /* only nonzero if drr_compressiontype is not 0 */ 298 uint64_t drr_compressed_size; 299 /* only nonzero for raw streams */ 300 uint8_t drr_salt[ZIO_DATA_SALT_LEN]; 301 uint8_t drr_iv[ZIO_DATA_IV_LEN]; 302 uint8_t drr_mac[ZIO_DATA_MAC_LEN]; 303 /* content follows */ 304 } drr_write; 305 struct drr_free { 306 uint64_t drr_object; 307 uint64_t drr_offset; 308 uint64_t drr_length; 309 uint64_t drr_toguid; 310 } drr_free; 311 struct drr_write_byref { 312 /* where to put the data */ 313 uint64_t drr_object; 314 uint64_t drr_offset; 315 uint64_t drr_length; 316 uint64_t drr_toguid; 317 /* where to find the prior copy of the data */ 318 uint64_t drr_refguid; 319 uint64_t drr_refobject; 320 uint64_t drr_refoffset; 321 /* properties of the data */ 322 uint8_t drr_checksumtype; 323 uint8_t drr_flags; 324 uint8_t drr_pad2[6]; 325 ddt_key_t drr_key; /* deduplication key */ 326 } drr_write_byref; 327 struct drr_spill { 328 uint64_t drr_object; 329 uint64_t drr_length; 330 uint64_t drr_toguid; 331 uint8_t drr_flags; 332 uint8_t drr_compressiontype; 333 uint8_t drr_pad[6]; 334 /* only nonzero for raw streams */ 335 uint64_t drr_compressed_size; 336 uint8_t drr_salt[ZIO_DATA_SALT_LEN]; 337 uint8_t drr_iv[ZIO_DATA_IV_LEN]; 338 uint8_t drr_mac[ZIO_DATA_MAC_LEN]; 339 dmu_object_type_t drr_type; 340 /* spill data follows */ 341 } drr_spill; 342 struct drr_write_embedded { 343 uint64_t drr_object; 344 uint64_t drr_offset; 345 /* logical length, should equal blocksize */ 346 uint64_t drr_length; 347 uint64_t drr_toguid; 348 uint8_t drr_compression; 349 uint8_t drr_etype; 350 uint8_t drr_pad[6]; 351 uint32_t drr_lsize; /* uncompressed size of payload */ 352 uint32_t drr_psize; /* compr. (real) size of payload */ 353 /* (possibly compressed) content follows */ 354 } drr_write_embedded; 355 struct drr_object_range { 356 uint64_t drr_firstobj; 357 uint64_t drr_numslots; 358 uint64_t drr_toguid; 359 uint8_t drr_salt[ZIO_DATA_SALT_LEN]; 360 uint8_t drr_iv[ZIO_DATA_IV_LEN]; 361 uint8_t drr_mac[ZIO_DATA_MAC_LEN]; 362 uint8_t drr_flags; 363 uint8_t drr_pad[3]; 364 } drr_object_range; 365 struct drr_redact { 366 uint64_t drr_object; 367 uint64_t drr_offset; 368 uint64_t drr_length; 369 uint64_t drr_toguid; 370 } drr_redact; 371 372 /* 373 * Note: drr_checksum is overlaid with all record types 374 * except DRR_BEGIN. Therefore its (non-pad) members 375 * must not overlap with members from the other structs. 376 * We accomplish this by putting its members at the very 377 * end of the struct. 378 */ 379 struct drr_checksum { 380 uint64_t drr_pad[34]; 381 /* 382 * fletcher-4 checksum of everything preceding the 383 * checksum. 384 */ 385 zio_cksum_t drr_checksum; 386 } drr_checksum; 387 } drr_u; 388 } dmu_replay_record_t; 389 390 /* diff record range types */ 391 typedef enum diff_type { 392 DDR_NONE = 0x1, 393 DDR_INUSE = 0x2, 394 DDR_FREE = 0x4 395 } diff_type_t; 396 397 /* 398 * The diff reports back ranges of free or in-use objects. 399 */ 400 typedef struct dmu_diff_record { 401 uint64_t ddr_type; 402 uint64_t ddr_first; 403 uint64_t ddr_last; 404 } dmu_diff_record_t; 405 406 typedef struct zinject_record { 407 uint64_t zi_objset; 408 uint64_t zi_object; 409 uint64_t zi_start; 410 uint64_t zi_end; 411 uint64_t zi_guid; 412 uint32_t zi_level; 413 uint32_t zi_error; 414 uint64_t zi_type; 415 uint32_t zi_freq; 416 uint32_t zi_failfast; 417 char zi_func[MAXNAMELEN]; 418 uint32_t zi_iotype; 419 int32_t zi_duration; 420 uint64_t zi_timer; 421 uint64_t zi_nlanes; 422 uint32_t zi_cmd; 423 uint32_t zi_dvas; 424 } zinject_record_t; 425 426 #define ZINJECT_NULL 0x1 427 #define ZINJECT_FLUSH_ARC 0x2 428 #define ZINJECT_UNLOAD_SPA 0x4 429 #define ZINJECT_CALC_RANGE 0x8 430 431 #define ZEVENT_NONE 0x0 432 #define ZEVENT_NONBLOCK 0x1 433 #define ZEVENT_SIZE 1024 434 435 #define ZEVENT_SEEK_START 0 436 #define ZEVENT_SEEK_END UINT64_MAX 437 438 /* scaled frequency ranges */ 439 #define ZI_PERCENTAGE_MIN 4294UL 440 #define ZI_PERCENTAGE_MAX UINT32_MAX 441 442 #define ZI_NO_DVA (-1) 443 444 typedef enum zinject_type { 445 ZINJECT_UNINITIALIZED, 446 ZINJECT_DATA_FAULT, 447 ZINJECT_DEVICE_FAULT, 448 ZINJECT_LABEL_FAULT, 449 ZINJECT_IGNORED_WRITES, 450 ZINJECT_PANIC, 451 ZINJECT_DELAY_IO, 452 ZINJECT_DECRYPT_FAULT, 453 ZINJECT_DELAY_IMPORT, 454 ZINJECT_DELAY_EXPORT, 455 } zinject_type_t; 456 457 typedef struct zfs_share { 458 uint64_t z_exportdata; 459 uint64_t z_sharedata; 460 uint64_t z_sharetype; /* 0 = share, 1 = unshare */ 461 uint64_t z_sharemax; /* max length of share string */ 462 } zfs_share_t; 463 464 /* 465 * ZFS file systems may behave the usual, POSIX-compliant way, where 466 * name lookups are case-sensitive. They may also be set up so that 467 * all the name lookups are case-insensitive, or so that only some 468 * lookups, the ones that set an FIGNORECASE flag, are case-insensitive. 469 */ 470 typedef enum zfs_case { 471 ZFS_CASE_SENSITIVE, 472 ZFS_CASE_INSENSITIVE, 473 ZFS_CASE_MIXED 474 } zfs_case_t; 475 476 /* 477 * zfs ioctl command structure 478 */ 479 480 /* 481 * Note: this struct must have the same layout in 32-bit and 64-bit, so 482 * that 32-bit processes (like /sbin/zfs) can pass it to the 64-bit 483 * kernel. Therefore, we add padding to it so that no "hidden" padding 484 * is automatically added on 64-bit (but not on 32-bit). 485 */ 486 typedef struct zfs_cmd { 487 char zc_name[MAXPATHLEN]; /* name of pool or dataset */ 488 uint64_t zc_nvlist_src; /* really (char *) */ 489 uint64_t zc_nvlist_src_size; 490 uint64_t zc_nvlist_dst; /* really (char *) */ 491 uint64_t zc_nvlist_dst_size; 492 boolean_t zc_nvlist_dst_filled; /* put an nvlist in dst? */ 493 int zc_pad2; 494 495 /* 496 * The following members are for legacy ioctls which haven't been 497 * converted to the new method. 498 */ 499 uint64_t zc_history; /* really (char *) */ 500 char zc_value[MAXPATHLEN * 2]; 501 char zc_string[MAXNAMELEN]; 502 uint64_t zc_guid; 503 uint64_t zc_nvlist_conf; /* really (char *) */ 504 uint64_t zc_nvlist_conf_size; 505 uint64_t zc_cookie; 506 uint64_t zc_objset_type; 507 uint64_t zc_perm_action; 508 uint64_t zc_history_len; 509 uint64_t zc_history_offset; 510 uint64_t zc_obj; 511 uint64_t zc_iflags; /* internal to zfs(7fs) */ 512 zfs_share_t zc_share; 513 dmu_objset_stats_t zc_objset_stats; 514 struct drr_begin zc_begin_record; 515 zinject_record_t zc_inject_record; 516 uint32_t zc_defer_destroy; 517 uint32_t zc_flags; 518 uint64_t zc_action_handle; 519 int zc_cleanup_fd; 520 uint8_t zc_simple; 521 uint8_t zc_pad[3]; /* alignment */ 522 uint64_t zc_sendobj; 523 uint64_t zc_fromobj; 524 uint64_t zc_createtxg; 525 zfs_stat_t zc_stat; 526 uint64_t zc_zoneid; 527 } zfs_cmd_t; 528 529 typedef struct zfs_useracct { 530 char zu_domain[256]; 531 uid_t zu_rid; 532 uint32_t zu_pad; 533 uint64_t zu_space; 534 } zfs_useracct_t; 535 536 #define ZFSDEV_MAX_MINOR (1 << 16) 537 538 #define ZPOOL_EXPORT_AFTER_SPLIT 0x1 539 540 #ifdef _KERNEL 541 struct objset; 542 struct zfsvfs; 543 544 typedef struct zfs_creat { 545 nvlist_t *zct_zplprops; 546 nvlist_t *zct_props; 547 } zfs_creat_t; 548 549 extern int zfs_secpolicy_snapshot_perms(const char *, cred_t *); 550 extern int zfs_secpolicy_rename_perms(const char *, const char *, cred_t *); 551 extern int zfs_secpolicy_destroy_perms(const char *, cred_t *); 552 extern void zfs_unmount_snap(const char *); 553 extern void zfs_destroy_unmount_origin(const char *); 554 extern int getzfsvfs_impl(struct objset *, struct zfsvfs **); 555 extern int getzfsvfs(const char *, struct zfsvfs **); 556 557 enum zfsdev_state_type { 558 ZST_ONEXIT, 559 ZST_ZEVENT, 560 ZST_ALL, 561 }; 562 563 /* 564 * The zfsdev_state_t structure is managed as a singly-linked list 565 * from which items are never deleted. This allows for lock-free 566 * reading of the list so long as assignments to the zs_next and 567 * reads from zs_minor are performed atomically. Empty items are 568 * indicated by storing -1 into zs_minor. 569 */ 570 typedef struct zfsdev_state { 571 struct zfsdev_state *zs_next; /* next zfsdev_state_t link */ 572 minor_t zs_minor; /* made up minor number */ 573 void *zs_onexit; /* onexit data */ 574 void *zs_zevent; /* zevent data */ 575 } zfsdev_state_t; 576 577 extern void *zfsdev_get_state(minor_t minor, enum zfsdev_state_type which); 578 extern int zfsdev_getminor(zfs_file_t *fp, minor_t *minorp); 579 580 extern uint_t zfs_allow_log_key; 581 582 #endif /* _KERNEL */ 583 584 #ifdef __cplusplus 585 } 586 #endif 587 588 #endif /* _SYS_ZFS_IOCTL_H */ 589