Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
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FreeBSD/Linux Kernel Cross Reference
sys/contrib/openzfs/include/sys/zfs_ioctl.h
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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, 2020 by Delphix. All rights reserved. 24 * Copyright 2016 RackTop Systems. 25 * Copyright (c) 2017, Intel Corporation. 26 */ 27 28 #ifndef _SYS_ZFS_IOCTL_H 29 #define _SYS_ZFS_IOCTL_H 30 31 #include <sys/cred.h> 32 #include <sys/dmu.h> 33 #include <sys/zio.h> 34 #include <sys/dsl_deleg.h> 35 #include <sys/spa.h> 36 #include <sys/zfs_stat.h> 37 38 #ifdef _KERNEL 39 #include <sys/nvpair.h> 40 #endif /* _KERNEL */ 41 42 #ifdef __cplusplus 43 extern "C" { 44 #endif 45 46 /* 47 * The structures in this file are passed between userland and the 48 * kernel. Userland may be running a 32-bit process, while the kernel 49 * is 64-bit. Therefore, these structures need to compile the same in 50 * 32-bit and 64-bit. This means not using type "long", and adding 51 * explicit padding so that the 32-bit structure will not be packed more 52 * tightly than the 64-bit structure (which requires 64-bit alignment). 53 */ 54 55 /* 56 * Property values for snapdir 57 */ 58 #define ZFS_SNAPDIR_HIDDEN 0 59 #define ZFS_SNAPDIR_VISIBLE 1 60 61 /* 62 * Property values for snapdev 63 */ 64 #define ZFS_SNAPDEV_HIDDEN 0 65 #define ZFS_SNAPDEV_VISIBLE 1 66 /* 67 * Property values for acltype 68 */ 69 #define ZFS_ACLTYPE_OFF 0 70 #define ZFS_ACLTYPE_POSIX 1 71 #define ZFS_ACLTYPE_NFSV4 2 72 73 /* 74 * Field manipulation macros for the drr_versioninfo field of the 75 * send stream header. 76 */ 77 78 /* 79 * Header types for zfs send streams. 80 */ 81 typedef enum drr_headertype { 82 DMU_SUBSTREAM = 0x1, 83 DMU_COMPOUNDSTREAM = 0x2 84 } drr_headertype_t; 85 86 #define DMU_GET_STREAM_HDRTYPE(vi) BF64_GET((vi), 0, 2) 87 #define DMU_SET_STREAM_HDRTYPE(vi, x) BF64_SET((vi), 0, 2, x) 88 89 #define DMU_GET_FEATUREFLAGS(vi) BF64_GET((vi), 2, 30) 90 #define DMU_SET_FEATUREFLAGS(vi, x) BF64_SET((vi), 2, 30, x) 91 92 /* 93 * Feature flags for zfs send streams (flags in drr_versioninfo) 94 */ 95 96 #define DMU_BACKUP_FEATURE_DEDUP (1 << 0) 97 #define DMU_BACKUP_FEATURE_DEDUPPROPS (1 << 1) 98 #define DMU_BACKUP_FEATURE_SA_SPILL (1 << 2) 99 /* flags #3 - #15 are reserved for incompatible closed-source implementations */ 100 #define DMU_BACKUP_FEATURE_EMBED_DATA (1 << 16) 101 #define DMU_BACKUP_FEATURE_LZ4 (1 << 17) 102 /* flag #18 is reserved for a Delphix feature */ 103 #define DMU_BACKUP_FEATURE_LARGE_BLOCKS (1 << 19) 104 #define DMU_BACKUP_FEATURE_RESUMING (1 << 20) 105 #define DMU_BACKUP_FEATURE_REDACTED (1 << 21) 106 #define DMU_BACKUP_FEATURE_COMPRESSED (1 << 22) 107 #define DMU_BACKUP_FEATURE_LARGE_DNODE (1 << 23) 108 #define DMU_BACKUP_FEATURE_RAW (1 << 24) 109 #define DMU_BACKUP_FEATURE_ZSTD (1 << 25) 110 #define DMU_BACKUP_FEATURE_HOLDS (1 << 26) 111 /* 112 * The SWITCH_TO_LARGE_BLOCKS feature indicates that we can receive 113 * incremental LARGE_BLOCKS streams (those with WRITE records of >128KB) even 114 * if the previous send did not use LARGE_BLOCKS, and thus its large blocks 115 * were split into multiple 128KB WRITE records. (See 116 * flush_write_batch_impl() and receive_object()). Older software that does 117 * not support this flag may encounter a bug when switching to large blocks, 118 * which causes files to incorrectly be zeroed. 119 * 120 * This flag is currently not set on any send streams. In the future, we 121 * intend for incremental send streams of snapshots that have large blocks to 122 * use LARGE_BLOCKS by default, and these streams will also have the 123 * SWITCH_TO_LARGE_BLOCKS feature set. This ensures that streams from the 124 * default use of "zfs send" won't encounter the bug mentioned above. 125 */ 126 #define DMU_BACKUP_FEATURE_SWITCH_TO_LARGE_BLOCKS (1 << 27) 127 /* flag #28 is reserved for a Nutanix feature */ 128 /* 129 * flag #29 is the last unused bit. It is reserved to indicate a to-be-designed 130 * extension to the stream format which will accomodate more feature flags. 131 * If you need to add another feature flag, please reach out to the OpenZFS 132 * community, e.g., on GitHub or Slack. 133 */ 134 135 /* 136 * Mask of all supported backup features 137 */ 138 #define DMU_BACKUP_FEATURE_MASK (DMU_BACKUP_FEATURE_SA_SPILL | \ 139 DMU_BACKUP_FEATURE_EMBED_DATA | DMU_BACKUP_FEATURE_LZ4 | \ 140 DMU_BACKUP_FEATURE_RESUMING | DMU_BACKUP_FEATURE_LARGE_BLOCKS | \ 141 DMU_BACKUP_FEATURE_COMPRESSED | DMU_BACKUP_FEATURE_LARGE_DNODE | \ 142 DMU_BACKUP_FEATURE_RAW | DMU_BACKUP_FEATURE_HOLDS | \ 143 DMU_BACKUP_FEATURE_REDACTED | DMU_BACKUP_FEATURE_SWITCH_TO_LARGE_BLOCKS | \ 144 DMU_BACKUP_FEATURE_ZSTD) 145 146 /* Are all features in the given flag word currently supported? */ 147 #define DMU_STREAM_SUPPORTED(x) (!((x) & ~DMU_BACKUP_FEATURE_MASK)) 148 149 typedef enum dmu_send_resume_token_version { 150 ZFS_SEND_RESUME_TOKEN_VERSION = 1 151 } dmu_send_resume_token_version_t; 152 153 /* 154 * The drr_versioninfo field of the dmu_replay_record has the 155 * following layout: 156 * 157 * 64 56 48 40 32 24 16 8 0 158 * +-------+-------+-------+-------+-------+-------+-------+-------+ 159 * | reserved | feature-flags |C|S| 160 * +-------+-------+-------+-------+-------+-------+-------+-------+ 161 * 162 * The low order two bits indicate the header type: SUBSTREAM (0x1) 163 * or COMPOUNDSTREAM (0x2). Using two bits for this is historical: 164 * this field used to be a version number, where the two version types 165 * were 1 and 2. Using two bits for this allows earlier versions of 166 * the code to be able to recognize send streams that don't use any 167 * of the features indicated by feature flags. 168 */ 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 /* 234 * zfs ioctl command structure 235 */ 236 237 /* Header is used in C++ so can't forward declare untagged struct */ 238 struct drr_begin { 239 uint64_t drr_magic; 240 uint64_t drr_versioninfo; /* was drr_version */ 241 uint64_t drr_creation_time; 242 dmu_objset_type_t drr_type; 243 uint32_t drr_flags; 244 uint64_t drr_toguid; 245 uint64_t drr_fromguid; 246 char drr_toname[MAXNAMELEN]; 247 }; 248 249 typedef struct dmu_replay_record { 250 enum { 251 DRR_BEGIN, DRR_OBJECT, DRR_FREEOBJECTS, 252 DRR_WRITE, DRR_FREE, DRR_END, DRR_WRITE_BYREF, 253 DRR_SPILL, DRR_WRITE_EMBEDDED, DRR_OBJECT_RANGE, DRR_REDACT, 254 DRR_NUMTYPES 255 } drr_type; 256 uint32_t drr_payloadlen; 257 union { 258 struct drr_begin drr_begin; 259 struct drr_end { 260 zio_cksum_t drr_checksum; 261 uint64_t drr_toguid; 262 } drr_end; 263 struct drr_object { 264 uint64_t drr_object; 265 dmu_object_type_t drr_type; 266 dmu_object_type_t drr_bonustype; 267 uint32_t drr_blksz; 268 uint32_t drr_bonuslen; 269 uint8_t drr_checksumtype; 270 uint8_t drr_compress; 271 uint8_t drr_dn_slots; 272 uint8_t drr_flags; 273 uint32_t drr_raw_bonuslen; 274 uint64_t drr_toguid; 275 /* only (possibly) nonzero for raw streams */ 276 uint8_t drr_indblkshift; 277 uint8_t drr_nlevels; 278 uint8_t drr_nblkptr; 279 uint8_t drr_pad[5]; 280 uint64_t drr_maxblkid; 281 /* bonus content follows */ 282 } drr_object; 283 struct drr_freeobjects { 284 uint64_t drr_firstobj; 285 uint64_t drr_numobjs; 286 uint64_t drr_toguid; 287 } drr_freeobjects; 288 struct drr_write { 289 uint64_t drr_object; 290 dmu_object_type_t drr_type; 291 uint32_t drr_pad; 292 uint64_t drr_offset; 293 uint64_t drr_logical_size; 294 uint64_t drr_toguid; 295 uint8_t drr_checksumtype; 296 uint8_t drr_flags; 297 uint8_t drr_compressiontype; 298 uint8_t drr_pad2[5]; 299 /* deduplication key */ 300 ddt_key_t drr_key; 301 /* only nonzero if drr_compressiontype is not 0 */ 302 uint64_t drr_compressed_size; 303 /* only nonzero for raw streams */ 304 uint8_t drr_salt[ZIO_DATA_SALT_LEN]; 305 uint8_t drr_iv[ZIO_DATA_IV_LEN]; 306 uint8_t drr_mac[ZIO_DATA_MAC_LEN]; 307 /* content follows */ 308 } drr_write; 309 struct drr_free { 310 uint64_t drr_object; 311 uint64_t drr_offset; 312 uint64_t drr_length; 313 uint64_t drr_toguid; 314 } drr_free; 315 struct drr_write_byref { 316 /* where to put the data */ 317 uint64_t drr_object; 318 uint64_t drr_offset; 319 uint64_t drr_length; 320 uint64_t drr_toguid; 321 /* where to find the prior copy of the data */ 322 uint64_t drr_refguid; 323 uint64_t drr_refobject; 324 uint64_t drr_refoffset; 325 /* properties of the data */ 326 uint8_t drr_checksumtype; 327 uint8_t drr_flags; 328 uint8_t drr_pad2[6]; 329 ddt_key_t drr_key; /* deduplication key */ 330 } drr_write_byref; 331 struct drr_spill { 332 uint64_t drr_object; 333 uint64_t drr_length; 334 uint64_t drr_toguid; 335 uint8_t drr_flags; 336 uint8_t drr_compressiontype; 337 uint8_t drr_pad[6]; 338 /* only nonzero for raw streams */ 339 uint64_t drr_compressed_size; 340 uint8_t drr_salt[ZIO_DATA_SALT_LEN]; 341 uint8_t drr_iv[ZIO_DATA_IV_LEN]; 342 uint8_t drr_mac[ZIO_DATA_MAC_LEN]; 343 dmu_object_type_t drr_type; 344 /* spill data follows */ 345 } drr_spill; 346 struct drr_write_embedded { 347 uint64_t drr_object; 348 uint64_t drr_offset; 349 /* logical length, should equal blocksize */ 350 uint64_t drr_length; 351 uint64_t drr_toguid; 352 uint8_t drr_compression; 353 uint8_t drr_etype; 354 uint8_t drr_pad[6]; 355 uint32_t drr_lsize; /* uncompressed size of payload */ 356 uint32_t drr_psize; /* compr. (real) size of payload */ 357 /* (possibly compressed) content follows */ 358 } drr_write_embedded; 359 struct drr_object_range { 360 uint64_t drr_firstobj; 361 uint64_t drr_numslots; 362 uint64_t drr_toguid; 363 uint8_t drr_salt[ZIO_DATA_SALT_LEN]; 364 uint8_t drr_iv[ZIO_DATA_IV_LEN]; 365 uint8_t drr_mac[ZIO_DATA_MAC_LEN]; 366 uint8_t drr_flags; 367 uint8_t drr_pad[3]; 368 } drr_object_range; 369 struct drr_redact { 370 uint64_t drr_object; 371 uint64_t drr_offset; 372 uint64_t drr_length; 373 uint64_t drr_toguid; 374 } drr_redact; 375 376 /* 377 * Note: drr_checksum is overlaid with all record types 378 * except DRR_BEGIN. Therefore its (non-pad) members 379 * must not overlap with members from the other structs. 380 * We accomplish this by putting its members at the very 381 * end of the struct. 382 */ 383 struct drr_checksum { 384 uint64_t drr_pad[34]; 385 /* 386 * fletcher-4 checksum of everything preceding the 387 * checksum. 388 */ 389 zio_cksum_t drr_checksum; 390 } drr_checksum; 391 } drr_u; 392 } dmu_replay_record_t; 393 394 /* diff record range types */ 395 typedef enum diff_type { 396 DDR_NONE = 0x1, 397 DDR_INUSE = 0x2, 398 DDR_FREE = 0x4 399 } diff_type_t; 400 401 /* 402 * The diff reports back ranges of free or in-use objects. 403 */ 404 typedef struct dmu_diff_record { 405 uint64_t ddr_type; 406 uint64_t ddr_first; 407 uint64_t ddr_last; 408 } dmu_diff_record_t; 409 410 typedef struct zinject_record { 411 uint64_t zi_objset; 412 uint64_t zi_object; 413 uint64_t zi_start; 414 uint64_t zi_end; 415 uint64_t zi_guid; 416 uint32_t zi_level; 417 uint32_t zi_error; 418 uint64_t zi_type; 419 uint32_t zi_freq; 420 uint32_t zi_failfast; 421 char zi_func[MAXNAMELEN]; 422 uint32_t zi_iotype; 423 int32_t zi_duration; 424 uint64_t zi_timer; 425 uint64_t zi_nlanes; 426 uint32_t zi_cmd; 427 uint32_t zi_dvas; 428 } zinject_record_t; 429 430 #define ZINJECT_NULL 0x1 431 #define ZINJECT_FLUSH_ARC 0x2 432 #define ZINJECT_UNLOAD_SPA 0x4 433 #define ZINJECT_CALC_RANGE 0x8 434 435 #define ZEVENT_NONE 0x0 436 #define ZEVENT_NONBLOCK 0x1 437 #define ZEVENT_SIZE 1024 438 439 #define ZEVENT_SEEK_START 0 440 #define ZEVENT_SEEK_END UINT64_MAX 441 442 /* scaled frequency ranges */ 443 #define ZI_PERCENTAGE_MIN 4294UL 444 #define ZI_PERCENTAGE_MAX UINT32_MAX 445 446 #define ZI_NO_DVA (-1) 447 448 typedef enum zinject_type { 449 ZINJECT_UNINITIALIZED, 450 ZINJECT_DATA_FAULT, 451 ZINJECT_DEVICE_FAULT, 452 ZINJECT_LABEL_FAULT, 453 ZINJECT_IGNORED_WRITES, 454 ZINJECT_PANIC, 455 ZINJECT_DELAY_IO, 456 ZINJECT_DECRYPT_FAULT, 457 } zinject_type_t; 458 459 typedef struct zfs_share { 460 uint64_t z_exportdata; 461 uint64_t z_sharedata; 462 uint64_t z_sharetype; /* 0 = share, 1 = unshare */ 463 uint64_t z_sharemax; /* max length of share string */ 464 } zfs_share_t; 465 466 /* 467 * ZFS file systems may behave the usual, POSIX-compliant way, where 468 * name lookups are case-sensitive. They may also be set up so that 469 * all the name lookups are case-insensitive, or so that only some 470 * lookups, the ones that set an FIGNORECASE flag, are case-insensitive. 471 */ 472 typedef enum zfs_case { 473 ZFS_CASE_SENSITIVE, 474 ZFS_CASE_INSENSITIVE, 475 ZFS_CASE_MIXED 476 } zfs_case_t; 477 478 /* 479 * Note: this struct must have the same layout in 32-bit and 64-bit, so 480 * that 32-bit processes (like /sbin/zfs) can pass it to the 64-bit 481 * kernel. Therefore, we add padding to it so that no "hidden" padding 482 * is automatically added on 64-bit (but not on 32-bit). 483 */ 484 typedef struct zfs_cmd { 485 char zc_name[MAXPATHLEN]; /* name of pool or dataset */ 486 uint64_t zc_nvlist_src; /* really (char *) */ 487 uint64_t zc_nvlist_src_size; 488 uint64_t zc_nvlist_dst; /* really (char *) */ 489 uint64_t zc_nvlist_dst_size; 490 boolean_t zc_nvlist_dst_filled; /* put an nvlist in dst? */ 491 int zc_pad2; 492 493 /* 494 * The following members are for legacy ioctls which haven't been 495 * converted to the new method. 496 */ 497 uint64_t zc_history; /* really (char *) */ 498 char zc_value[MAXPATHLEN * 2]; 499 char zc_string[MAXNAMELEN]; 500 uint64_t zc_guid; 501 uint64_t zc_nvlist_conf; /* really (char *) */ 502 uint64_t zc_nvlist_conf_size; 503 uint64_t zc_cookie; 504 uint64_t zc_objset_type; 505 uint64_t zc_perm_action; 506 uint64_t zc_history_len; 507 uint64_t zc_history_offset; 508 uint64_t zc_obj; 509 uint64_t zc_iflags; /* internal to zfs(7fs) */ 510 zfs_share_t zc_share; 511 dmu_objset_stats_t zc_objset_stats; 512 struct drr_begin zc_begin_record; 513 zinject_record_t zc_inject_record; 514 uint32_t zc_defer_destroy; 515 uint32_t zc_flags; 516 uint64_t zc_action_handle; 517 int zc_cleanup_fd; 518 uint8_t zc_simple; 519 uint8_t zc_pad[3]; /* alignment */ 520 uint64_t zc_sendobj; 521 uint64_t zc_fromobj; 522 uint64_t zc_createtxg; 523 zfs_stat_t zc_stat; 524 uint64_t zc_zoneid; 525 } zfs_cmd_t; 526 527 typedef struct zfs_useracct { 528 char zu_domain[256]; 529 uid_t zu_rid; 530 uint32_t zu_pad; 531 uint64_t zu_space; 532 } zfs_useracct_t; 533 534 #define ZFSDEV_MAX_MINOR (1 << 16) 535 536 #define ZPOOL_EXPORT_AFTER_SPLIT 0x1 537 538 #ifdef _KERNEL 539 struct objset; 540 struct zfsvfs; 541 542 typedef struct zfs_creat { 543 nvlist_t *zct_zplprops; 544 nvlist_t *zct_props; 545 } zfs_creat_t; 546 547 extern int zfs_secpolicy_snapshot_perms(const char *, cred_t *); 548 extern int zfs_secpolicy_rename_perms(const char *, const char *, cred_t *); 549 extern int zfs_secpolicy_destroy_perms(const char *, cred_t *); 550 extern void zfs_unmount_snap(const char *); 551 extern void zfs_destroy_unmount_origin(const char *); 552 extern int getzfsvfs_impl(struct objset *, struct zfsvfs **); 553 extern int getzfsvfs(const char *, struct zfsvfs **); 554 555 enum zfsdev_state_type { 556 ZST_ONEXIT, 557 ZST_ZEVENT, 558 ZST_ALL, 559 }; 560 561 /* 562 * The zfsdev_state_t structure is managed as a singly-linked list 563 * from which items are never deleted. This allows for lock-free 564 * reading of the list so long as assignments to the zs_next and 565 * reads from zs_minor are performed atomically. Empty items are 566 * indicated by storing -1 into zs_minor. 567 */ 568 typedef struct zfsdev_state { 569 struct zfsdev_state *zs_next; /* next zfsdev_state_t link */ 570 minor_t zs_minor; /* made up minor number */ 571 void *zs_onexit; /* onexit data */ 572 void *zs_zevent; /* zevent data */ 573 } zfsdev_state_t; 574 575 extern void *zfsdev_get_state(minor_t minor, enum zfsdev_state_type which); 576 extern int zfsdev_getminor(zfs_file_t *fp, minor_t *minorp); 577 578 extern uint_t zfs_fsyncer_key; 579 extern uint_t zfs_allow_log_key; 580 581 #endif /* _KERNEL */ 582 583 #ifdef __cplusplus 584 } 585 #endif 586 587 #endif /* _SYS_ZFS_IOCTL_H */
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