kernel/fs/zfs/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) 2011-2012 Pawel Jakub Dawidek. All rights reserved.
  24  * Copyright (c) 2012, 2016 by Delphix. All rights reserved.
  25  * Copyright 2016 RackTop Systems.
  26  * Copyright (c) 2014 Integros [integros.com]
  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
  62 /*
  63  * Field manipulation macros for the drr_versioninfo field of the
  64  * send stream header.
  65  */
  66
  67 /*
  68  * Header types for zfs send streams.
  69  */
  70 typedef enum drr_headertype {
  71         DMU_SUBSTREAM = 0x1,
  72         DMU_COMPOUNDSTREAM = 0x2
  73 } drr_headertype_t;
  74
  75 #define DMU_GET_STREAM_HDRTYPE(vi)      BF64_GET((vi), 0, 2)
  76 #define DMU_SET_STREAM_HDRTYPE(vi, x)   BF64_SET((vi), 0, 2, x)
  77
  78 #define DMU_GET_FEATUREFLAGS(vi)        BF64_GET((vi), 2, 30)
  79 #define DMU_SET_FEATUREFLAGS(vi, x)     BF64_SET((vi), 2, 30, x)
  80
  81 /*
  82  * Feature flags for zfs send streams (flags in drr_versioninfo)
  83  */
  84
  85 #define DMU_BACKUP_FEATURE_DEDUP                (1 << 0)
  86 #define DMU_BACKUP_FEATURE_DEDUPPROPS           (1 << 1)
  87 #define DMU_BACKUP_FEATURE_SA_SPILL             (1 << 2)
  88 /* flags #3 - #15 are reserved for incompatible closed-source implementations */
  89 #define DMU_BACKUP_FEATURE_EMBED_DATA           (1 << 16)
  90 #define DMU_BACKUP_FEATURE_LZ4                  (1 << 17)
  91 /* flag #18 is reserved for a Delphix feature */
  92 #define DMU_BACKUP_FEATURE_LARGE_BLOCKS         (1 << 19)
  93 #define DMU_BACKUP_FEATURE_RESUMING             (1 << 20)
  94 /* flag #21 is reserved for a Delphix feature */
  95 #define DMU_BACKUP_FEATURE_COMPRESSED           (1 << 22)
  96 /* flag #23 is reserved for the large dnode feature */
  97
  98 /*
  99  * Mask of all supported backup features
 100  */
 101 #define DMU_BACKUP_FEATURE_MASK (DMU_BACKUP_FEATURE_DEDUP | \
 102     DMU_BACKUP_FEATURE_DEDUPPROPS | DMU_BACKUP_FEATURE_SA_SPILL | \
 103     DMU_BACKUP_FEATURE_EMBED_DATA | DMU_BACKUP_FEATURE_LZ4 | \
 104     DMU_BACKUP_FEATURE_RESUMING | \
 105     DMU_BACKUP_FEATURE_LARGE_BLOCKS | \
 106     DMU_BACKUP_FEATURE_COMPRESSED)
 107
 108 /* Are all features in the given flag word currently supported? */
 109 #define DMU_STREAM_SUPPORTED(x) (!((x) & ~DMU_BACKUP_FEATURE_MASK))
 110
 111 typedef enum dmu_send_resume_token_version {
 112         ZFS_SEND_RESUME_TOKEN_VERSION = 1
 113 } dmu_send_resume_token_version_t;
 114
 115 /*
 116  * The drr_versioninfo field of the dmu_replay_record has the
 117  * following layout:
 118  *
 119  *      64      56      48      40      32      24      16      8       0
 120  *      +-------+-------+-------+-------+-------+-------+-------+-------+
 121  *      |               reserved        |        feature-flags      |C|S|
 122  *      +-------+-------+-------+-------+-------+-------+-------+-------+
 123  *
 124  * The low order two bits indicate the header type: SUBSTREAM (0x1)
 125  * or COMPOUNDSTREAM (0x2).  Using two bits for this is historical:
 126  * this field used to be a version number, where the two version types
 127  * were 1 and 2.  Using two bits for this allows earlier versions of
 128  * the code to be able to recognize send streams that don't use any
 129  * of the features indicated by feature flags.
 130  */
 131
 132 #define DMU_BACKUP_MAGIC 0x2F5bacbacULL
 133
 134 /*
 135  * Send stream flags.  Bits 24-31 are reserved for vendor-specific
 136  * implementations and should not be used.
 137  */
 138 #define DRR_FLAG_CLONE          (1<<0)
 139 #define DRR_FLAG_CI_DATA        (1<<1)
 140 /*
 141  * This send stream, if it is a full send, includes the FREE and FREEOBJECT
 142  * records that are created by the sending process.  This means that the send
 143  * stream can be received as a clone, even though it is not an incremental.
 144  * This is not implemented as a feature flag, because the receiving side does
 145  * not need to have implemented it to receive this stream; it is fully backwards
 146  * compatible.  We need a flag, though, because full send streams without it
 147  * cannot necessarily be received as a clone correctly.
 148  */
 149 #define DRR_FLAG_FREERECORDS    (1<<2)
 150
 151 /*
 152  * flags in the drr_checksumflags field in the DRR_WRITE and
 153  * DRR_WRITE_BYREF blocks
 154  */
 155 #define DRR_CHECKSUM_DEDUP      (1<<0)
 156
 157 #define DRR_IS_DEDUP_CAPABLE(flags)     ((flags) & DRR_CHECKSUM_DEDUP)
 158
 159 /* deal with compressed drr_write replay records */
 160 #define DRR_WRITE_COMPRESSED(drrw)      ((drrw)->drr_compressiontype != 0)
 161 #define DRR_WRITE_PAYLOAD_SIZE(drrw) \
 162         (DRR_WRITE_COMPRESSED(drrw) ? (drrw)->drr_compressed_size : \
 163         (drrw)->drr_logical_size)
 164
 165 /*
 166  * zfs ioctl command structure
 167  */
 168 typedef struct dmu_replay_record {
 169         enum {
 170                 DRR_BEGIN, DRR_OBJECT, DRR_FREEOBJECTS,
 171                 DRR_WRITE, DRR_FREE, DRR_END, DRR_WRITE_BYREF,
 172                 DRR_SPILL, DRR_WRITE_EMBEDDED, DRR_NUMTYPES
 173         } drr_type;
 174         uint32_t drr_payloadlen;
 175         union {
 176                 struct drr_begin {
 177                         uint64_t drr_magic;
 178                         uint64_t drr_versioninfo; /* was drr_version */
 179                         uint64_t drr_creation_time;
 180                         dmu_objset_type_t drr_type;
 181                         uint32_t drr_flags;
 182                         uint64_t drr_toguid;
 183                         uint64_t drr_fromguid;
 184                         char drr_toname[MAXNAMELEN];
 185                 } drr_begin;
 186                 struct drr_end {
 187                         zio_cksum_t drr_checksum;
 188                         uint64_t drr_toguid;
 189                 } drr_end;
 190                 struct drr_object {
 191                         uint64_t drr_object;
 192                         dmu_object_type_t drr_type;
 193                         dmu_object_type_t drr_bonustype;
 194                         uint32_t drr_blksz;
 195                         uint32_t drr_bonuslen;
 196                         uint8_t drr_checksumtype;
 197                         uint8_t drr_compress;
 198                         uint8_t drr_pad[6];
 199                         uint64_t drr_toguid;
 200                         /* bonus content follows */
 201                 } drr_object;
 202                 struct drr_freeobjects {
 203                         uint64_t drr_firstobj;
 204                         uint64_t drr_numobjs;
 205                         uint64_t drr_toguid;
 206                 } drr_freeobjects;
 207                 struct drr_write {
 208                         uint64_t drr_object;
 209                         dmu_object_type_t drr_type;
 210                         uint32_t drr_pad;
 211                         uint64_t drr_offset;
 212                         uint64_t drr_logical_size;
 213                         uint64_t drr_toguid;
 214                         uint8_t drr_checksumtype;
 215                         uint8_t drr_checksumflags;
 216                         uint8_t drr_compressiontype;
 217                         uint8_t drr_pad2[5];
 218                         /* deduplication key */
 219                         ddt_key_t drr_key;
 220                         /* only nonzero if drr_compressiontype is not 0 */
 221                         uint64_t drr_compressed_size;
 222                         /* content follows */
 223                 } drr_write;
 224                 struct drr_free {
 225                         uint64_t drr_object;
 226                         uint64_t drr_offset;
 227                         uint64_t drr_length;
 228                         uint64_t drr_toguid;
 229                 } drr_free;
 230                 struct drr_write_byref {
 231                         /* where to put the data */
 232                         uint64_t drr_object;
 233                         uint64_t drr_offset;
 234                         uint64_t drr_length;
 235                         uint64_t drr_toguid;
 236                         /* where to find the prior copy of the data */
 237                         uint64_t drr_refguid;
 238                         uint64_t drr_refobject;
 239                         uint64_t drr_refoffset;
 240                         /* properties of the data */
 241                         uint8_t drr_checksumtype;
 242                         uint8_t drr_checksumflags;
 243                         uint8_t drr_pad2[6];
 244                         ddt_key_t drr_key; /* deduplication key */
 245                 } drr_write_byref;
 246                 struct drr_spill {
 247                         uint64_t drr_object;
 248                         uint64_t drr_length;
 249                         uint64_t drr_toguid;
 250                         uint64_t drr_pad[4]; /* needed for crypto */
 251                         /* spill data follows */
 252                 } drr_spill;
 253                 struct drr_write_embedded {
 254                         uint64_t drr_object;
 255                         uint64_t drr_offset;
 256                         /* logical length, should equal blocksize */
 257                         uint64_t drr_length;
 258                         uint64_t drr_toguid;
 259                         uint8_t drr_compression;
 260                         uint8_t drr_etype;
 261                         uint8_t drr_pad[6];
 262                         uint32_t drr_lsize; /* uncompressed size of payload */
 263                         uint32_t drr_psize; /* compr. (real) size of payload */
 264                         /* (possibly compressed) content follows */
 265                 } drr_write_embedded;
 266
 267                 /*
 268                  * Nore: drr_checksum is overlaid with all record types
 269                  * except DRR_BEGIN.  Therefore its (non-pad) members
 270                  * must not overlap with members from the other structs.
 271                  * We accomplish this by putting its members at the very
 272                  * end of the struct.
 273                  */
 274                 struct drr_checksum {
 275                         uint64_t drr_pad[34];
 276                         /*
 277                          * fletcher-4 checksum of everything preceding the
 278                          * checksum.
 279                          */
 280                         zio_cksum_t drr_checksum;
 281                 } drr_checksum;
 282         } drr_u;
 283 } dmu_replay_record_t;
 284
 285 /* diff record range types */
 286 typedef enum diff_type {
 287         DDR_NONE = 0x1,
 288         DDR_INUSE = 0x2,
 289         DDR_FREE = 0x4
 290 } diff_type_t;
 291
 292 /*
 293  * The diff reports back ranges of free or in-use objects.
 294  */
 295 typedef struct dmu_diff_record {
 296         uint64_t ddr_type;
 297         uint64_t ddr_first;
 298         uint64_t ddr_last;
 299 } dmu_diff_record_t;
 300
 301 typedef struct zinject_record {
 302         uint64_t        zi_objset;
 303         uint64_t        zi_object;
 304         uint64_t        zi_start;
 305         uint64_t        zi_end;
 306         uint64_t        zi_guid;
 307         uint32_t        zi_level;
 308         uint32_t        zi_error;
 309         uint64_t        zi_type;
 310         uint32_t        zi_freq;
 311         uint32_t        zi_failfast;
 312         char            zi_func[MAXNAMELEN];
 313         uint32_t        zi_iotype;
 314         int32_t         zi_duration;
 315         uint64_t        zi_timer;
 316         uint64_t        zi_nlanes;
 317         uint32_t        zi_cmd;
 318         uint32_t        zi_pad;
 319 } zinject_record_t;
 320
 321 #define ZINJECT_NULL            0x1
 322 #define ZINJECT_FLUSH_ARC       0x2
 323 #define ZINJECT_UNLOAD_SPA      0x4
 324
 325 typedef enum zinject_type {
 326         ZINJECT_UNINITIALIZED,
 327         ZINJECT_DATA_FAULT,
 328         ZINJECT_DEVICE_FAULT,
 329         ZINJECT_LABEL_FAULT,
 330         ZINJECT_IGNORED_WRITES,
 331         ZINJECT_PANIC,
 332         ZINJECT_DELAY_IO,
 333 } zinject_type_t;
 334
 335 typedef struct zfs_share {
 336         uint64_t        z_exportdata;
 337         uint64_t        z_sharedata;
 338         uint64_t        z_sharetype;    /* 0 = share, 1 = unshare */
 339         uint64_t        z_sharemax;  /* max length of share string */
 340 } zfs_share_t;
 341
 342 /*
 343  * ZFS file systems may behave the usual, POSIX-compliant way, where
 344  * name lookups are case-sensitive.  They may also be set up so that
 345  * all the name lookups are case-insensitive, or so that only some
 346  * lookups, the ones that set an FIGNORECASE flag, are case-insensitive.
 347  */
 348 typedef enum zfs_case {
 349         ZFS_CASE_SENSITIVE,
 350         ZFS_CASE_INSENSITIVE,
 351         ZFS_CASE_MIXED
 352 } zfs_case_t;
 353
 354 /*
 355  * Note: this struct must have the same layout in 32-bit and 64-bit, so
 356  * that 32-bit processes (like /sbin/zfs) can pass it to the 64-bit
 357  * kernel.  Therefore, we add padding to it so that no "hidden" padding
 358  * is automatically added on 64-bit (but not on 32-bit).
 359  */
 360 typedef struct zfs_cmd {
 361         char            zc_name[MAXPATHLEN];    /* name of pool or dataset */
 362         uint64_t        zc_nvlist_src;          /* really (char *) */
 363         uint64_t        zc_nvlist_src_size;
 364         uint64_t        zc_nvlist_dst;          /* really (char *) */
 365         uint64_t        zc_nvlist_dst_size;
 366         boolean_t       zc_nvlist_dst_filled;   /* put an nvlist in dst? */
 367         int             zc_pad2;
 368
 369         /*
 370          * The following members are for legacy ioctls which haven't been
 371          * converted to the new method.
 372          */
 373         uint64_t        zc_history;             /* really (char *) */
 374         char            zc_value[MAXPATHLEN * 2];
 375         char            zc_string[MAXNAMELEN];
 376         uint64_t        zc_guid;
 377         uint64_t        zc_nvlist_conf;         /* really (char *) */
 378         uint64_t        zc_nvlist_conf_size;
 379         uint64_t        zc_cookie;
 380         uint64_t        zc_objset_type;
 381         uint64_t        zc_perm_action;
 382         uint64_t        zc_history_len;
 383         uint64_t        zc_history_offset;
 384         uint64_t        zc_obj;
 385         uint64_t        zc_iflags;              /* internal to zfs(7fs) */
 386         zfs_share_t     zc_share;
 387         dmu_objset_stats_t zc_objset_stats;
 388         dmu_replay_record_t zc_begin_record;
 389         zinject_record_t zc_inject_record;
 390         uint32_t        zc_defer_destroy;
 391         uint32_t        zc_flags;
 392         uint64_t        zc_action_handle;
 393         int             zc_cleanup_fd;
 394         uint8_t         zc_simple;
 395         uint8_t         zc_pad3[3];
 396         boolean_t       zc_resumable;
 397         uint32_t        zc_pad4;
 398         uint64_t        zc_sendobj;
 399         uint64_t        zc_fromobj;
 400         uint64_t        zc_createtxg;
 401         zfs_stat_t      zc_stat;
 402 } zfs_cmd_t;
 403
 404 typedef struct zfs_useracct {
 405         char zu_domain[256];
 406         uid_t zu_rid;
 407         uint32_t zu_pad;
 408         uint64_t zu_space;
 409 } zfs_useracct_t;
 410
 411 #define ZFSDEV_MAX_MINOR        (1 << 16)
 412 #define ZFS_MIN_MINOR   (ZFSDEV_MAX_MINOR + 1)
 413
 414 #define ZPOOL_EXPORT_AFTER_SPLIT 0x1
 415
 416 #ifdef _KERNEL
 417 struct objset;
 418 struct zfsvfs;
 419
 420 typedef struct zfs_creat {
 421         nvlist_t        *zct_zplprops;
 422         nvlist_t        *zct_props;
 423 } zfs_creat_t;
 424
 425 extern dev_info_t *zfs_dip;
 426
 427 extern int zfs_secpolicy_snapshot_perms(const char *, cred_t *);
 428 extern int zfs_secpolicy_rename_perms(const char *, const char *, cred_t *);
 429 extern int zfs_secpolicy_destroy_perms(const char *, cred_t *);
 430 extern int zfs_busy(void);
 431 extern int zfs_unmount_snap(const char *);
 432 extern void zfs_destroy_unmount_origin(const char *);
 433 extern int getzfsvfs_impl(struct objset *, struct zfsvfs **);
 434
 435 /*
 436  * ZFS minor numbers can refer to either a control device instance or
 437  * a zvol. Depending on the value of zss_type, zss_data points to either
 438  * a zvol_state_t or a zfs_onexit_t.
 439  */
 440 enum zfs_soft_state_type {
 441         ZSST_ZVOL,
 442         ZSST_CTLDEV
 443 };
 444
 445 typedef struct zfs_soft_state {
 446         enum zfs_soft_state_type zss_type;
 447         void *zss_data;
 448 } zfs_soft_state_t;
 449
 450 extern void *zfsdev_get_soft_state(minor_t minor,
 451     enum zfs_soft_state_type which);
 452 extern minor_t zfsdev_minor_alloc(void);
 453
 454 extern void *zfsdev_state;
 455 extern kmutex_t zfsdev_state_lock;
 456
 457 #endif  /* _KERNEL */
 458
 459 #ifdef  __cplusplus
 460 }
 461 #endif
 462
 463 #endif  /* _SYS_ZFS_IOCTL_H */