usr/src/uts/common/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) 2012, 2015 by Delphix. All rights reserved.
  24  */
  25
  26 #ifndef _SYS_ZFS_IOCTL_H
  27 #define _SYS_ZFS_IOCTL_H
  28
  29 #include <sys/cred.h>
  30 #include <sys/dmu.h>
  31 #include <sys/zio.h>
  32 #include <sys/dsl_deleg.h>
  33 #include <sys/spa.h>
  34 #include <sys/zfs_stat.h>
  35
  36 #ifdef _KERNEL
  37 #include <sys/nvpair.h>
  38 #endif  /* _KERNEL */
  39
  40 #ifdef  __cplusplus
  41 extern "C" {
  42 #endif
  43
  44 /*
  45  * The structures in this file are passed between userland and the
  46  * kernel.  Userland may be running a 32-bit process, while the kernel
  47  * is 64-bit.  Therefore, these structures need to compile the same in
  48  * 32-bit and 64-bit.  This means not using type "long", and adding
  49  * explicit padding so that the 32-bit structure will not be packed more
  50  * tightly than the 64-bit structure (which requires 64-bit alignment).
  51  */
  52
  53 /*
  54  * Property values for snapdir
  55  */
  56 #define ZFS_SNAPDIR_HIDDEN              0
  57 #define ZFS_SNAPDIR_VISIBLE             1
  58
  59 /*
  60  * Field manipulation macros for the drr_versioninfo field of the
  61  * send stream header.
  62  */
  63
  64 /*
  65  * Header types for zfs send streams.
  66  */
  67 typedef enum drr_headertype {
  68         DMU_SUBSTREAM = 0x1,
  69         DMU_COMPOUNDSTREAM = 0x2
  70 } drr_headertype_t;
  71
  72 #define DMU_GET_STREAM_HDRTYPE(vi)      BF64_GET((vi), 0, 2)
  73 #define DMU_SET_STREAM_HDRTYPE(vi, x)   BF64_SET((vi), 0, 2, x)
  74
  75 #define DMU_GET_FEATUREFLAGS(vi)        BF64_GET((vi), 2, 30)
  76 #define DMU_SET_FEATUREFLAGS(vi, x)     BF64_SET((vi), 2, 30, x)
  77
  78 /*
  79  * Feature flags for zfs send streams (flags in drr_versioninfo)
  80  */
  81
  82 #define DMU_BACKUP_FEATURE_DEDUP                (1 << 0)
  83 #define DMU_BACKUP_FEATURE_DEDUPPROPS           (1 << 1)
  84 #define DMU_BACKUP_FEATURE_SA_SPILL             (1 << 2)
  85 /* flags #3 - #15 are reserved for incompatible closed-source implementations */
  86 #define DMU_BACKUP_FEATURE_EMBED_DATA           (1 << 16)
  87 #define DMU_BACKUP_FEATURE_EMBED_DATA_LZ4       (1 << 17)
  88 /* flag #18 is reserved for a Delphix feature */
  89 #define DMU_BACKUP_FEATURE_LARGE_BLOCKS         (1 << 19)
  90 #define DMU_BACKUP_FEATURE_RESUMING             (1 << 20)
  91
  92 /*
  93  * Mask of all supported backup features
  94  */
  95 #define DMU_BACKUP_FEATURE_MASK (DMU_BACKUP_FEATURE_DEDUP | \
  96     DMU_BACKUP_FEATURE_DEDUPPROPS | DMU_BACKUP_FEATURE_SA_SPILL | \
  97     DMU_BACKUP_FEATURE_EMBED_DATA | DMU_BACKUP_FEATURE_EMBED_DATA_LZ4 | \
  98     DMU_BACKUP_FEATURE_RESUMING | \
  99     DMU_BACKUP_FEATURE_LARGE_BLOCKS)
 100
 101 /* Are all features in the given flag word currently supported? */
 102 #define DMU_STREAM_SUPPORTED(x) (!((x) & ~DMU_BACKUP_FEATURE_MASK))
 103
 104 typedef enum dmu_send_resume_token_version {
 105         ZFS_SEND_RESUME_TOKEN_VERSION = 1
 106 } dmu_send_resume_token_version_t;
 107
 108 /*
 109  * The drr_versioninfo field of the dmu_replay_record has the
 110  * following layout:
 111  *
 112  *      64      56      48      40      32      24      16      8       0
 113  *      +-------+-------+-------+-------+-------+-------+-------+-------+
 114  *      |               reserved        |        feature-flags      |C|S|
 115  *      +-------+-------+-------+-------+-------+-------+-------+-------+
 116  *
 117  * The low order two bits indicate the header type: SUBSTREAM (0x1)
 118  * or COMPOUNDSTREAM (0x2).  Using two bits for this is historical:
 119  * this field used to be a version number, where the two version types
 120  * were 1 and 2.  Using two bits for this allows earlier versions of
 121  * the code to be able to recognize send streams that don't use any
 122  * of the features indicated by feature flags.
 123  */
 124
 125 #define DMU_BACKUP_MAGIC 0x2F5bacbacULL
 126
 127 #define DRR_FLAG_CLONE          (1<<0)
 128 #define DRR_FLAG_CI_DATA        (1<<1)
 129 /*
 130  * This send stream, if it is a full send, includes the FREE and FREEOBJECT
 131  * records that are created by the sending process.  This means that the send
 132  * stream can be received as a clone, even though it is not an incremental.
 133  * This is not implemented as a feature flag, because the receiving side does
 134  * not need to have implemented it to receive this stream; it is fully backwards
 135  * compatible.  We need a flag, though, because full send streams without it
 136  * cannot necessarily be received as a clone correctly.
 137  */
 138 #define DRR_FLAG_FREERECORDS    (1<<2)
 139
 140 /*
 141  * flags in the drr_checksumflags field in the DRR_WRITE and
 142  * DRR_WRITE_BYREF blocks
 143  */
 144 #define DRR_CHECKSUM_DEDUP      (1<<0)
 145
 146 #define DRR_IS_DEDUP_CAPABLE(flags)     ((flags) & DRR_CHECKSUM_DEDUP)
 147
 148 /*
 149  * zfs ioctl command structure
 150  */
 151 typedef struct dmu_replay_record {
 152         enum {
 153                 DRR_BEGIN, DRR_OBJECT, DRR_FREEOBJECTS,
 154                 DRR_WRITE, DRR_FREE, DRR_END, DRR_WRITE_BYREF,
 155                 DRR_SPILL, DRR_WRITE_EMBEDDED, DRR_NUMTYPES
 156         } drr_type;
 157         uint32_t drr_payloadlen;
 158         union {
 159                 struct drr_begin {
 160                         uint64_t drr_magic;
 161                         uint64_t drr_versioninfo; /* was drr_version */
 162                         uint64_t drr_creation_time;
 163                         dmu_objset_type_t drr_type;
 164                         uint32_t drr_flags;
 165                         uint64_t drr_toguid;
 166                         uint64_t drr_fromguid;
 167                         char drr_toname[MAXNAMELEN];
 168                 } drr_begin;
 169                 struct drr_end {
 170                         zio_cksum_t drr_checksum;
 171                         uint64_t drr_toguid;
 172                 } drr_end;
 173                 struct drr_object {
 174                         uint64_t drr_object;
 175                         dmu_object_type_t drr_type;
 176                         dmu_object_type_t drr_bonustype;
 177                         uint32_t drr_blksz;
 178                         uint32_t drr_bonuslen;
 179                         uint8_t drr_checksumtype;
 180                         uint8_t drr_compress;
 181                         uint8_t drr_pad[6];
 182                         uint64_t drr_toguid;
 183                         /* bonus content follows */
 184                 } drr_object;
 185                 struct drr_freeobjects {
 186                         uint64_t drr_firstobj;
 187                         uint64_t drr_numobjs;
 188                         uint64_t drr_toguid;
 189                 } drr_freeobjects;
 190                 struct drr_write {
 191                         uint64_t drr_object;
 192                         dmu_object_type_t drr_type;
 193                         uint32_t drr_pad;
 194                         uint64_t drr_offset;
 195                         uint64_t drr_length;
 196                         uint64_t drr_toguid;
 197                         uint8_t drr_checksumtype;
 198                         uint8_t drr_checksumflags;
 199                         uint8_t drr_pad2[6];
 200                         ddt_key_t drr_key; /* deduplication key */
 201                         /* content follows */
 202                 } drr_write;
 203                 struct drr_free {
 204                         uint64_t drr_object;
 205                         uint64_t drr_offset;
 206                         uint64_t drr_length;
 207                         uint64_t drr_toguid;
 208                 } drr_free;
 209                 struct drr_write_byref {
 210                         /* where to put the data */
 211                         uint64_t drr_object;
 212                         uint64_t drr_offset;
 213                         uint64_t drr_length;
 214                         uint64_t drr_toguid;
 215                         /* where to find the prior copy of the data */
 216                         uint64_t drr_refguid;
 217                         uint64_t drr_refobject;
 218                         uint64_t drr_refoffset;
 219                         /* properties of the data */
 220                         uint8_t drr_checksumtype;
 221                         uint8_t drr_checksumflags;
 222                         uint8_t drr_pad2[6];
 223                         ddt_key_t drr_key; /* deduplication key */
 224                 } drr_write_byref;
 225                 struct drr_spill {
 226                         uint64_t drr_object;
 227                         uint64_t drr_length;
 228                         uint64_t drr_toguid;
 229                         uint64_t drr_pad[4]; /* needed for crypto */
 230                         /* spill data follows */
 231                 } drr_spill;
 232                 struct drr_write_embedded {
 233                         uint64_t drr_object;
 234                         uint64_t drr_offset;
 235                         /* logical length, should equal blocksize */
 236                         uint64_t drr_length;
 237                         uint64_t drr_toguid;
 238                         uint8_t drr_compression;
 239                         uint8_t drr_etype;
 240                         uint8_t drr_pad[6];
 241                         uint32_t drr_lsize; /* uncompressed size of payload */
 242                         uint32_t drr_psize; /* compr. (real) size of payload */
 243                         /* (possibly compressed) content follows */
 244                 } drr_write_embedded;
 245
 246                 /*
 247                  * Nore: drr_checksum is overlaid with all record types
 248                  * except DRR_BEGIN.  Therefore its (non-pad) members
 249                  * must not overlap with members from the other structs.
 250                  * We accomplish this by putting its members at the very
 251                  * end of the struct.
 252                  */
 253                 struct drr_checksum {
 254                         uint64_t drr_pad[34];
 255                         /*
 256                          * fletcher-4 checksum of everything preceding the
 257                          * checksum.
 258                          */
 259                         zio_cksum_t drr_checksum;
 260                 } drr_checksum;
 261         } drr_u;
 262 } dmu_replay_record_t;
 263
 264 /* diff record range types */
 265 typedef enum diff_type {
 266         DDR_NONE = 0x1,
 267         DDR_INUSE = 0x2,
 268         DDR_FREE = 0x4
 269 } diff_type_t;
 270
 271 /*
 272  * The diff reports back ranges of free or in-use objects.
 273  */
 274 typedef struct dmu_diff_record {
 275         uint64_t ddr_type;
 276         uint64_t ddr_first;
 277         uint64_t ddr_last;
 278 } dmu_diff_record_t;
 279
 280 typedef struct zinject_record {
 281         uint64_t        zi_objset;
 282         uint64_t        zi_object;
 283         uint64_t        zi_start;
 284         uint64_t        zi_end;
 285         uint64_t        zi_guid;
 286         uint32_t        zi_level;
 287         uint32_t        zi_error;
 288         uint64_t        zi_type;
 289         uint32_t        zi_freq;
 290         uint32_t        zi_failfast;
 291         char            zi_func[MAXNAMELEN];
 292         uint32_t        zi_iotype;
 293         int32_t         zi_duration;
 294         uint64_t        zi_timer;
 295         uint64_t        zi_nlanes;
 296         uint32_t        zi_cmd;
 297         uint32_t        zi_pad;
 298 } zinject_record_t;
 299
 300 #define ZINJECT_NULL            0x1
 301 #define ZINJECT_FLUSH_ARC       0x2
 302 #define ZINJECT_UNLOAD_SPA      0x4
 303
 304 typedef enum zinject_type {
 305         ZINJECT_UNINITIALIZED,
 306         ZINJECT_DATA_FAULT,
 307         ZINJECT_DEVICE_FAULT,
 308         ZINJECT_LABEL_FAULT,
 309         ZINJECT_IGNORED_WRITES,
 310         ZINJECT_PANIC,
 311         ZINJECT_DELAY_IO,
 312 } zinject_type_t;
 313
 314 typedef struct zfs_share {
 315         uint64_t        z_exportdata;
 316         uint64_t        z_sharedata;
 317         uint64_t        z_sharetype;    /* 0 = share, 1 = unshare */
 318         uint64_t        z_sharemax;  /* max length of share string */
 319 } zfs_share_t;
 320
 321 /*
 322  * ZFS file systems may behave the usual, POSIX-compliant way, where
 323  * name lookups are case-sensitive.  They may also be set up so that
 324  * all the name lookups are case-insensitive, or so that only some
 325  * lookups, the ones that set an FIGNORECASE flag, are case-insensitive.
 326  */
 327 typedef enum zfs_case {
 328         ZFS_CASE_SENSITIVE,
 329         ZFS_CASE_INSENSITIVE,
 330         ZFS_CASE_MIXED
 331 } zfs_case_t;
 332
 333 typedef struct zfs_cmd {
 334         char            zc_name[MAXPATHLEN];    /* name of pool or dataset */
 335         uint64_t        zc_nvlist_src;          /* really (char *) */
 336         uint64_t        zc_nvlist_src_size;
 337         uint64_t        zc_nvlist_dst;          /* really (char *) */
 338         uint64_t        zc_nvlist_dst_size;
 339         boolean_t       zc_nvlist_dst_filled;   /* put an nvlist in dst? */
 340         int             zc_pad2;
 341
 342         /*
 343          * The following members are for legacy ioctls which haven't been
 344          * converted to the new method.
 345          */
 346         uint64_t        zc_history;             /* really (char *) */
 347         char            zc_value[MAXPATHLEN * 2];
 348         char            zc_string[MAXNAMELEN];
 349         uint64_t        zc_guid;
 350         uint64_t        zc_nvlist_conf;         /* really (char *) */
 351         uint64_t        zc_nvlist_conf_size;
 352         uint64_t        zc_cookie;
 353         uint64_t        zc_objset_type;
 354         uint64_t        zc_perm_action;
 355         uint64_t        zc_history_len;
 356         uint64_t        zc_history_offset;
 357         uint64_t        zc_obj;
 358         uint64_t        zc_iflags;              /* internal to zfs(7fs) */
 359         zfs_share_t     zc_share;
 360         dmu_objset_stats_t zc_objset_stats;
 361         dmu_replay_record_t zc_begin_record;
 362         zinject_record_t zc_inject_record;
 363         uint32_t        zc_defer_destroy;
 364         uint32_t        zc_flags;
 365         uint64_t        zc_action_handle;
 366         int             zc_cleanup_fd;
 367         boolean_t       zc_resumable;
 368         uint64_t        zc_sendobj;
 369         uint64_t        zc_fromobj;
 370         uint64_t        zc_createtxg;
 371         zfs_stat_t      zc_stat;
 372 } zfs_cmd_t;
 373
 374 typedef struct zfs_useracct {
 375         char zu_domain[256];
 376         uid_t zu_rid;
 377         uint32_t zu_pad;
 378         uint64_t zu_space;
 379 } zfs_useracct_t;
 380
 381 #define ZFSDEV_MAX_MINOR        (1 << 16)
 382 #define ZFS_MIN_MINOR   (ZFSDEV_MAX_MINOR + 1)
 383
 384 #define ZPOOL_EXPORT_AFTER_SPLIT 0x1
 385
 386 #ifdef _KERNEL
 387
 388 typedef struct zfs_creat {
 389         nvlist_t        *zct_zplprops;
 390         nvlist_t        *zct_props;
 391 } zfs_creat_t;
 392
 393 extern dev_info_t *zfs_dip;
 394
 395 extern int zfs_secpolicy_snapshot_perms(const char *name, cred_t *cr);
 396 extern int zfs_secpolicy_rename_perms(const char *from,
 397     const char *to, cred_t *cr);
 398 extern int zfs_secpolicy_destroy_perms(const char *name, cred_t *cr);
 399 extern int zfs_busy(void);
 400 extern int zfs_unmount_snap(const char *);
 401 extern void zfs_destroy_unmount_origin(const char *);
 402
 403 /*
 404  * ZFS minor numbers can refer to either a control device instance or
 405  * a zvol. Depending on the value of zss_type, zss_data points to either
 406  * a zvol_state_t or a zfs_onexit_t.
 407  */
 408 enum zfs_soft_state_type {
 409         ZSST_ZVOL,
 410         ZSST_CTLDEV
 411 };
 412
 413 typedef struct zfs_soft_state {
 414         enum zfs_soft_state_type zss_type;
 415         void *zss_data;
 416 } zfs_soft_state_t;
 417
 418 extern void *zfsdev_get_soft_state(minor_t minor,
 419     enum zfs_soft_state_type which);
 420 extern minor_t zfsdev_minor_alloc(void);
 421
 422 extern void *zfsdev_state;
 423 extern kmutex_t zfsdev_state_lock;
 424
 425 #endif  /* _KERNEL */
 426
 427 #ifdef  __cplusplus
 428 }
 429 #endif
 430
 431 #endif  /* _SYS_ZFS_IOCTL_H */