include/sys/zfs_ioctl.h

   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 */