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 http://www.opensolaris.org/os/licensing.
  10  * See the License for the specific language governing permissions
  11  * and limitations under the License.
  12  *
  13  * When distributing Covered Code, include this CDDL HEADER in each
  14  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
  15  * If applicable, add the following below this CDDL HEADER, with the
  16  * fields enclosed by brackets "[]" replaced with your own identifying
  17  * information: Portions Copyright [yyyy] [name of copyright owner]
  18  *
  19  * CDDL HEADER END
  20  */
  21 /*
  22  * Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved.
  23  * Copyright (c) 2012, 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
 128 /*
 129  * Mask of all supported backup features
 130  */
 131 #define DMU_BACKUP_FEATURE_MASK (DMU_BACKUP_FEATURE_SA_SPILL | \
 132     DMU_BACKUP_FEATURE_EMBED_DATA | DMU_BACKUP_FEATURE_LZ4 | \
 133     DMU_BACKUP_FEATURE_RESUMING | DMU_BACKUP_FEATURE_LARGE_BLOCKS | \
 134     DMU_BACKUP_FEATURE_COMPRESSED | DMU_BACKUP_FEATURE_LARGE_DNODE | \
 135     DMU_BACKUP_FEATURE_RAW | DMU_BACKUP_FEATURE_HOLDS | \
 136     DMU_BACKUP_FEATURE_REDACTED | DMU_BACKUP_FEATURE_SWITCH_TO_LARGE_BLOCKS | \
 137     DMU_BACKUP_FEATURE_ZSTD)
 138
 139 /* Are all features in the given flag word currently supported? */
 140 #define DMU_STREAM_SUPPORTED(x) (!((x) & ~DMU_BACKUP_FEATURE_MASK))
 141
 142 typedef enum dmu_send_resume_token_version {
 143         ZFS_SEND_RESUME_TOKEN_VERSION = 1
 144 } dmu_send_resume_token_version_t;
 145
 146 /*
 147  * The drr_versioninfo field of the dmu_replay_record has the
 148  * following layout:
 149  *
 150  *      64      56      48      40      32      24      16      8       0
 151  *      +-------+-------+-------+-------+-------+-------+-------+-------+
 152  *      |               reserved        |        feature-flags      |C|S|
 153  *      +-------+-------+-------+-------+-------+-------+-------+-------+
 154  *
 155  * The low order two bits indicate the header type: SUBSTREAM (0x1)
 156  * or COMPOUNDSTREAM (0x2).  Using two bits for this is historical:
 157  * this field used to be a version number, where the two version types
 158  * were 1 and 2.  Using two bits for this allows earlier versions of
 159  * the code to be able to recognize send streams that don't use any
 160  * of the features indicated by feature flags.
 161  */
 162
 163 #define DMU_BACKUP_MAGIC 0x2F5bacbacULL
 164
 165 /*
 166  * Send stream flags.  Bits 24-31 are reserved for vendor-specific
 167  * implementations and should not be used.
 168  */
 169 #define DRR_FLAG_CLONE          (1<<0)
 170 #define DRR_FLAG_CI_DATA        (1<<1)
 171 /*
 172  * This send stream, if it is a full send, includes the FREE and FREEOBJECT
 173  * records that are created by the sending process.  This means that the send
 174  * stream can be received as a clone, even though it is not an incremental.
 175  * This is not implemented as a feature flag, because the receiving side does
 176  * not need to have implemented it to receive this stream; it is fully backwards
 177  * compatible.  We need a flag, though, because full send streams without it
 178  * cannot necessarily be received as a clone correctly.
 179  */
 180 #define DRR_FLAG_FREERECORDS    (1<<2)
 181 /*
 182  * When DRR_FLAG_SPILL_BLOCK is set it indicates the DRR_OBJECT_SPILL
 183  * and DRR_SPILL_UNMODIFIED flags are meaningful in the send stream.
 184  *
 185  * When DRR_FLAG_SPILL_BLOCK is set, DRR_OBJECT records will have
 186  * DRR_OBJECT_SPILL set if and only if they should have a spill block
 187  * (either an existing one, or a new one in the send stream).  When clear
 188  * the object does not have a spill block and any existing spill block
 189  * should be freed.
 190  *
 191  * Similarly, when DRR_FLAG_SPILL_BLOCK is set, DRR_SPILL records will
 192  * have DRR_SPILL_UNMODIFIED set if and only if they were included for
 193  * backward compatibility purposes, and can be safely ignored by new versions
 194  * of zfs receive.  Previous versions of ZFS which do not understand the
 195  * DRR_FLAG_SPILL_BLOCK will process this record and recreate any missing
 196  * spill blocks.
 197  */
 198 #define DRR_FLAG_SPILL_BLOCK    (1<<3)
 199
 200 /*
 201  * flags in the drr_flags field in the DRR_WRITE, DRR_SPILL, DRR_OBJECT,
 202  * DRR_WRITE_BYREF, and DRR_OBJECT_RANGE blocks
 203  */
 204 #define DRR_CHECKSUM_DEDUP      (1<<0) /* not used for SPILL records */
 205 #define DRR_RAW_BYTESWAP        (1<<1)
 206 #define DRR_OBJECT_SPILL        (1<<2) /* OBJECT record has a spill block */
 207 #define DRR_SPILL_UNMODIFIED    (1<<2) /* SPILL record for unmodified block */
 208
 209 #define DRR_IS_DEDUP_CAPABLE(flags)     ((flags) & DRR_CHECKSUM_DEDUP)
 210 #define DRR_IS_RAW_BYTESWAPPED(flags)   ((flags) & DRR_RAW_BYTESWAP)
 211 #define DRR_OBJECT_HAS_SPILL(flags)     ((flags) & DRR_OBJECT_SPILL)
 212 #define DRR_SPILL_IS_UNMODIFIED(flags)  ((flags) & DRR_SPILL_UNMODIFIED)
 213
 214 /* deal with compressed drr_write replay records */
 215 #define DRR_WRITE_COMPRESSED(drrw)      ((drrw)->drr_compressiontype != 0)
 216 #define DRR_WRITE_PAYLOAD_SIZE(drrw) \
 217         (DRR_WRITE_COMPRESSED(drrw) ? (drrw)->drr_compressed_size : \
 218         (drrw)->drr_logical_size)
 219 #define DRR_SPILL_PAYLOAD_SIZE(drrs) \
 220         ((drrs)->drr_compressed_size ? \
 221         (drrs)->drr_compressed_size : (drrs)->drr_length)
 222 #define DRR_OBJECT_PAYLOAD_SIZE(drro) \
 223         ((drro)->drr_raw_bonuslen != 0 ? \
 224         (drro)->drr_raw_bonuslen : P2ROUNDUP((drro)->drr_bonuslen, 8))
 225
 226 /*
 227  * zfs ioctl command structure
 228  */
 229
 230 /* Header is used in C++ so can't forward declare untagged struct */
 231 struct drr_begin {
 232         uint64_t drr_magic;
 233         uint64_t drr_versioninfo; /* was drr_version */
 234         uint64_t drr_creation_time;
 235         dmu_objset_type_t drr_type;
 236         uint32_t drr_flags;
 237         uint64_t drr_toguid;
 238         uint64_t drr_fromguid;
 239         char drr_toname[MAXNAMELEN];
 240 };
 241
 242 typedef struct dmu_replay_record {
 243         enum {
 244                 DRR_BEGIN, DRR_OBJECT, DRR_FREEOBJECTS,
 245                 DRR_WRITE, DRR_FREE, DRR_END, DRR_WRITE_BYREF,
 246                 DRR_SPILL, DRR_WRITE_EMBEDDED, DRR_OBJECT_RANGE, DRR_REDACT,
 247                 DRR_NUMTYPES
 248         } drr_type;
 249         uint32_t drr_payloadlen;
 250         union {
 251                 struct drr_begin drr_begin;
 252                 struct drr_end {
 253                         zio_cksum_t drr_checksum;
 254                         uint64_t drr_toguid;
 255                 } drr_end;
 256                 struct drr_object {
 257                         uint64_t drr_object;
 258                         dmu_object_type_t drr_type;
 259                         dmu_object_type_t drr_bonustype;
 260                         uint32_t drr_blksz;
 261                         uint32_t drr_bonuslen;
 262                         uint8_t drr_checksumtype;
 263                         uint8_t drr_compress;
 264                         uint8_t drr_dn_slots;
 265                         uint8_t drr_flags;
 266                         uint32_t drr_raw_bonuslen;
 267                         uint64_t drr_toguid;
 268                         /* only (possibly) nonzero for raw streams */
 269                         uint8_t drr_indblkshift;
 270                         uint8_t drr_nlevels;
 271                         uint8_t drr_nblkptr;
 272                         uint8_t drr_pad[5];
 273                         uint64_t drr_maxblkid;
 274                         /* bonus content follows */
 275                 } drr_object;
 276                 struct drr_freeobjects {
 277                         uint64_t drr_firstobj;
 278                         uint64_t drr_numobjs;
 279                         uint64_t drr_toguid;
 280                 } drr_freeobjects;
 281                 struct drr_write {
 282                         uint64_t drr_object;
 283                         dmu_object_type_t drr_type;
 284                         uint32_t drr_pad;
 285                         uint64_t drr_offset;
 286                         uint64_t drr_logical_size;
 287                         uint64_t drr_toguid;
 288                         uint8_t drr_checksumtype;
 289                         uint8_t drr_flags;
 290                         uint8_t drr_compressiontype;
 291                         uint8_t drr_pad2[5];
 292                         /* deduplication key */
 293                         ddt_key_t drr_key;
 294                         /* only nonzero if drr_compressiontype is not 0 */
 295                         uint64_t drr_compressed_size;
 296                         /* only nonzero for raw streams */
 297                         uint8_t drr_salt[ZIO_DATA_SALT_LEN];
 298                         uint8_t drr_iv[ZIO_DATA_IV_LEN];
 299                         uint8_t drr_mac[ZIO_DATA_MAC_LEN];
 300                         /* content follows */
 301                 } drr_write;
 302                 struct drr_free {
 303                         uint64_t drr_object;
 304                         uint64_t drr_offset;
 305                         uint64_t drr_length;
 306                         uint64_t drr_toguid;
 307                 } drr_free;
 308                 struct drr_write_byref {
 309                         /* where to put the data */
 310                         uint64_t drr_object;
 311                         uint64_t drr_offset;
 312                         uint64_t drr_length;
 313                         uint64_t drr_toguid;
 314                         /* where to find the prior copy of the data */
 315                         uint64_t drr_refguid;
 316                         uint64_t drr_refobject;
 317                         uint64_t drr_refoffset;
 318                         /* properties of the data */
 319                         uint8_t drr_checksumtype;
 320                         uint8_t drr_flags;
 321                         uint8_t drr_pad2[6];
 322                         ddt_key_t drr_key; /* deduplication key */
 323                 } drr_write_byref;
 324                 struct drr_spill {
 325                         uint64_t drr_object;
 326                         uint64_t drr_length;
 327                         uint64_t drr_toguid;
 328                         uint8_t drr_flags;
 329                         uint8_t drr_compressiontype;
 330                         uint8_t drr_pad[6];
 331                         /* only nonzero for raw streams */
 332                         uint64_t drr_compressed_size;
 333                         uint8_t drr_salt[ZIO_DATA_SALT_LEN];
 334                         uint8_t drr_iv[ZIO_DATA_IV_LEN];
 335                         uint8_t drr_mac[ZIO_DATA_MAC_LEN];
 336                         dmu_object_type_t drr_type;
 337                         /* spill data follows */
 338                 } drr_spill;
 339                 struct drr_write_embedded {
 340                         uint64_t drr_object;
 341                         uint64_t drr_offset;
 342                         /* logical length, should equal blocksize */
 343                         uint64_t drr_length;
 344                         uint64_t drr_toguid;
 345                         uint8_t drr_compression;
 346                         uint8_t drr_etype;
 347                         uint8_t drr_pad[6];
 348                         uint32_t drr_lsize; /* uncompressed size of payload */
 349                         uint32_t drr_psize; /* compr. (real) size of payload */
 350                         /* (possibly compressed) content follows */
 351                 } drr_write_embedded;
 352                 struct drr_object_range {
 353                         uint64_t drr_firstobj;
 354                         uint64_t drr_numslots;
 355                         uint64_t drr_toguid;
 356                         uint8_t drr_salt[ZIO_DATA_SALT_LEN];
 357                         uint8_t drr_iv[ZIO_DATA_IV_LEN];
 358                         uint8_t drr_mac[ZIO_DATA_MAC_LEN];
 359                         uint8_t drr_flags;
 360                         uint8_t drr_pad[3];
 361                 } drr_object_range;
 362                 struct drr_redact {
 363                         uint64_t drr_object;
 364                         uint64_t drr_offset;
 365                         uint64_t drr_length;
 366                         uint64_t drr_toguid;
 367                 } drr_redact;
 368
 369                 /*
 370                  * Note: drr_checksum is overlaid with all record types
 371                  * except DRR_BEGIN.  Therefore its (non-pad) members
 372                  * must not overlap with members from the other structs.
 373                  * We accomplish this by putting its members at the very
 374                  * end of the struct.
 375                  */
 376                 struct drr_checksum {
 377                         uint64_t drr_pad[34];
 378                         /*
 379                          * fletcher-4 checksum of everything preceding the
 380                          * checksum.
 381                          */
 382                         zio_cksum_t drr_checksum;
 383                 } drr_checksum;
 384         } drr_u;
 385 } dmu_replay_record_t;
 386
 387 /* diff record range types */
 388 typedef enum diff_type {
 389         DDR_NONE = 0x1,
 390         DDR_INUSE = 0x2,
 391         DDR_FREE = 0x4
 392 } diff_type_t;
 393
 394 /*
 395  * The diff reports back ranges of free or in-use objects.
 396  */
 397 typedef struct dmu_diff_record {
 398         uint64_t ddr_type;
 399         uint64_t ddr_first;
 400         uint64_t ddr_last;
 401 } dmu_diff_record_t;
 402
 403 typedef struct zinject_record {
 404         uint64_t        zi_objset;
 405         uint64_t        zi_object;
 406         uint64_t        zi_start;
 407         uint64_t        zi_end;
 408         uint64_t        zi_guid;
 409         uint32_t        zi_level;
 410         uint32_t        zi_error;
 411         uint64_t        zi_type;
 412         uint32_t        zi_freq;
 413         uint32_t        zi_failfast;
 414         char            zi_func[MAXNAMELEN];
 415         uint32_t        zi_iotype;
 416         int32_t         zi_duration;
 417         uint64_t        zi_timer;
 418         uint64_t        zi_nlanes;
 419         uint32_t        zi_cmd;
 420         uint32_t        zi_dvas;
 421 } zinject_record_t;
 422
 423 #define ZINJECT_NULL            0x1
 424 #define ZINJECT_FLUSH_ARC       0x2
 425 #define ZINJECT_UNLOAD_SPA      0x4
 426 #define ZINJECT_CALC_RANGE      0x8
 427
 428 #define ZEVENT_NONE             0x0
 429 #define ZEVENT_NONBLOCK         0x1
 430 #define ZEVENT_SIZE             1024
 431
 432 #define ZEVENT_SEEK_START       0
 433 #define ZEVENT_SEEK_END         UINT64_MAX
 434
 435 /* scaled frequency ranges */
 436 #define ZI_PERCENTAGE_MIN       4294UL
 437 #define ZI_PERCENTAGE_MAX       UINT32_MAX
 438
 439 #define ZI_NO_DVA               (-1)
 440
 441 typedef enum zinject_type {
 442         ZINJECT_UNINITIALIZED,
 443         ZINJECT_DATA_FAULT,
 444         ZINJECT_DEVICE_FAULT,
 445         ZINJECT_LABEL_FAULT,
 446         ZINJECT_IGNORED_WRITES,
 447         ZINJECT_PANIC,
 448         ZINJECT_DELAY_IO,
 449         ZINJECT_DECRYPT_FAULT,
 450 } zinject_type_t;
 451
 452 typedef struct zfs_share {
 453         uint64_t        z_exportdata;
 454         uint64_t        z_sharedata;
 455         uint64_t        z_sharetype;    /* 0 = share, 1 = unshare */
 456         uint64_t        z_sharemax;  /* max length of share string */
 457 } zfs_share_t;
 458
 459 /*
 460  * ZFS file systems may behave the usual, POSIX-compliant way, where
 461  * name lookups are case-sensitive.  They may also be set up so that
 462  * all the name lookups are case-insensitive, or so that only some
 463  * lookups, the ones that set an FIGNORECASE flag, are case-insensitive.
 464  */
 465 typedef enum zfs_case {
 466         ZFS_CASE_SENSITIVE,
 467         ZFS_CASE_INSENSITIVE,
 468         ZFS_CASE_MIXED
 469 } zfs_case_t;
 470
 471 /*
 472  * Note: this struct must have the same layout in 32-bit and 64-bit, so
 473  * that 32-bit processes (like /sbin/zfs) can pass it to the 64-bit
 474  * kernel.  Therefore, we add padding to it so that no "hidden" padding
 475  * is automatically added on 64-bit (but not on 32-bit).
 476  */
 477 typedef struct zfs_cmd {
 478         char            zc_name[MAXPATHLEN];    /* name of pool or dataset */
 479         uint64_t        zc_nvlist_src;          /* really (char *) */
 480         uint64_t        zc_nvlist_src_size;
 481         uint64_t        zc_nvlist_dst;          /* really (char *) */
 482         uint64_t        zc_nvlist_dst_size;
 483         boolean_t       zc_nvlist_dst_filled;   /* put an nvlist in dst? */
 484         int             zc_pad2;
 485
 486         /*
 487          * The following members are for legacy ioctls which haven't been
 488          * converted to the new method.
 489          */
 490         uint64_t        zc_history;             /* really (char *) */
 491         char            zc_value[MAXPATHLEN * 2];
 492         char            zc_string[MAXNAMELEN];
 493         uint64_t        zc_guid;
 494         uint64_t        zc_nvlist_conf;         /* really (char *) */
 495         uint64_t        zc_nvlist_conf_size;
 496         uint64_t        zc_cookie;
 497         uint64_t        zc_objset_type;
 498         uint64_t        zc_perm_action;
 499         uint64_t        zc_history_len;
 500         uint64_t        zc_history_offset;
 501         uint64_t        zc_obj;
 502         uint64_t        zc_iflags;              /* internal to zfs(7fs) */
 503         zfs_share_t     zc_share;
 504         dmu_objset_stats_t zc_objset_stats;
 505         struct drr_begin zc_begin_record;
 506         zinject_record_t zc_inject_record;
 507         uint32_t        zc_defer_destroy;
 508         uint32_t        zc_flags;
 509         uint64_t        zc_action_handle;
 510         int             zc_cleanup_fd;
 511         uint8_t         zc_simple;
 512         uint8_t         zc_pad[3];              /* alignment */
 513         uint64_t        zc_sendobj;
 514         uint64_t        zc_fromobj;
 515         uint64_t        zc_createtxg;
 516         zfs_stat_t      zc_stat;
 517         uint64_t        zc_zoneid;
 518 } zfs_cmd_t;
 519
 520 typedef struct zfs_useracct {
 521         char zu_domain[256];
 522         uid_t zu_rid;
 523         uint32_t zu_pad;
 524         uint64_t zu_space;
 525 } zfs_useracct_t;
 526
 527 #define ZFSDEV_MAX_MINOR        (1 << 16)
 528 #define ZFS_MIN_MINOR   (ZFSDEV_MAX_MINOR + 1)
 529
 530 #define ZPOOL_EXPORT_AFTER_SPLIT 0x1
 531
 532 #ifdef _KERNEL
 533 struct objset;
 534 struct zfsvfs;
 535
 536 typedef struct zfs_creat {
 537         nvlist_t        *zct_zplprops;
 538         nvlist_t        *zct_props;
 539 } zfs_creat_t;
 540
 541 extern int zfs_secpolicy_snapshot_perms(const char *, cred_t *);
 542 extern int zfs_secpolicy_rename_perms(const char *, const char *, cred_t *);
 543 extern int zfs_secpolicy_destroy_perms(const char *, cred_t *);
 544 extern void zfs_unmount_snap(const char *);
 545 extern void zfs_destroy_unmount_origin(const char *);
 546 extern int getzfsvfs_impl(struct objset *, struct zfsvfs **);
 547 extern int getzfsvfs(const char *, struct zfsvfs **);
 548
 549 enum zfsdev_state_type {
 550         ZST_ONEXIT,
 551         ZST_ZEVENT,
 552         ZST_ALL,
 553 };
 554
 555 /*
 556  * The zfsdev_state_t structure is managed as a singly-linked list
 557  * from which items are never deleted.  This allows for lock-free
 558  * reading of the list so long as assignments to the zs_next and
 559  * reads from zs_minor are performed atomically.  Empty items are
 560  * indicated by storing -1 into zs_minor.
 561  */
 562 typedef struct zfsdev_state {
 563         struct zfsdev_state     *zs_next;       /* next zfsdev_state_t link */
 564         minor_t                 zs_minor;       /* made up minor number */
 565         void                    *zs_onexit;     /* onexit data */
 566         void                    *zs_zevent;     /* zevent data */
 567 } zfsdev_state_t;
 568
 569 extern void *zfsdev_get_state(minor_t minor, enum zfsdev_state_type which);
 570 extern int zfsdev_getminor(int fd, minor_t *minorp);
 571 extern minor_t zfsdev_minor_alloc(void);
 572
 573 extern uint_t zfs_fsyncer_key;
 574 extern uint_t zfs_allow_log_key;
 575
 576 #endif  /* _KERNEL */
 577
 578 #ifdef  __cplusplus
 579 }
 580 #endif
 581
 582 #endif  /* _SYS_ZFS_IOCTL_H */