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