ioctl.h

   1 /*
   2  * Copyright (C) 2007 Oracle.  All rights reserved.
   3  *
   4  * This program is free software; you can redistribute it and/or
   5  * modify it under the terms of the GNU General Public
   6  * License v2 as published by the Free Software Foundation.
   7  *
   8  * This program is distributed in the hope that it will be useful,
   9  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  10  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  11  * General Public License for more details.
  12  *
  13  * You should have received a copy of the GNU General Public
  14  * License along with this program; if not, write to the
  15  * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  16  * Boston, MA 021110-1307, USA.
  17  */
  18
  19 #ifndef __BTRFS_IOCTL_H__
  20 #define __BTRFS_IOCTL_H__
  21
  22 #ifdef __cplusplus
  23 extern "C" {
  24 #endif
  25
  26 #include <asm/types.h>
  27 #include <linux/ioctl.h>
  28 #include <stddef.h>
  29
  30 #ifndef __user
  31 #define __user
  32 #endif
  33
  34 /* We don't want to include entire kerncompat.h */
  35 #ifndef BUILD_ASSERT
  36 #define BUILD_ASSERT(x)
  37 #endif
  38
  39 #define BTRFS_IOCTL_MAGIC 0x94
  40 #define BTRFS_VOL_NAME_MAX 255
  41
  42 /* this should be 4k */
  43 #define BTRFS_PATH_NAME_MAX 4087
  44 struct btrfs_ioctl_vol_args {
  45         __s64 fd;
  46         char name[BTRFS_PATH_NAME_MAX + 1];
  47 };
  48 BUILD_ASSERT(sizeof(struct btrfs_ioctl_vol_args) == 4096);
  49
  50 #define BTRFS_DEVICE_PATH_NAME_MAX 1024
  51
  52 #define BTRFS_SUBVOL_CREATE_ASYNC       (1ULL << 0)
  53 #define BTRFS_SUBVOL_RDONLY             (1ULL << 1)
  54 #define BTRFS_SUBVOL_QGROUP_INHERIT     (1ULL << 2)
  55 #define BTRFS_DEVICE_SPEC_BY_ID         (1ULL << 3)
  56
  57 #define BTRFS_VOL_ARG_V2_FLAGS_SUPPORTED                \
  58                         (BTRFS_SUBVOL_CREATE_ASYNC |    \
  59                         BTRFS_SUBVOL_RDONLY |           \
  60                         BTRFS_SUBVOL_QGROUP_INHERIT |   \
  61                         BTRFS_DEVICE_SPEC_BY_ID)
  62
  63 #define BTRFS_FSID_SIZE 16
  64 #define BTRFS_UUID_SIZE 16
  65
  66 #define BTRFS_QGROUP_INHERIT_SET_LIMITS (1ULL << 0)
  67
  68 struct btrfs_qgroup_limit {
  69         __u64   flags;
  70         __u64   max_referenced;
  71         __u64   max_exclusive;
  72         __u64   rsv_referenced;
  73         __u64   rsv_exclusive;
  74 };
  75 BUILD_ASSERT(sizeof(struct btrfs_qgroup_limit) == 40);
  76
  77 struct btrfs_qgroup_inherit {
  78         __u64   flags;
  79         __u64   num_qgroups;
  80         __u64   num_ref_copies;
  81         __u64   num_excl_copies;
  82         struct btrfs_qgroup_limit lim;
  83         __u64   qgroups[0];
  84 };
  85 BUILD_ASSERT(sizeof(struct btrfs_qgroup_inherit) == 72);
  86
  87 struct btrfs_ioctl_qgroup_limit_args {
  88         __u64   qgroupid;
  89         struct btrfs_qgroup_limit lim;
  90 };
  91 BUILD_ASSERT(sizeof(struct btrfs_ioctl_qgroup_limit_args) == 48);
  92
  93 #define BTRFS_SUBVOL_NAME_MAX 4039
  94 struct btrfs_ioctl_vol_args_v2 {
  95         __s64 fd;
  96         __u64 transid;
  97         __u64 flags;
  98         union {
  99                 struct {
 100                         __u64 size;
 101                         struct btrfs_qgroup_inherit __user *qgroup_inherit;
 102                 };
 103                 __u64 unused[4];
 104         };
 105         union {
 106                 char name[BTRFS_SUBVOL_NAME_MAX + 1];
 107                 __u64 devid;
 108         };
 109 };
 110 BUILD_ASSERT(sizeof(struct btrfs_ioctl_vol_args_v2) == 4096);
 111
 112 /*
 113  * structure to report errors and progress to userspace, either as a
 114  * result of a finished scrub, a canceled scrub or a progress inquiry
 115  */
 116 struct btrfs_scrub_progress {
 117         __u64 data_extents_scrubbed;    /* # of data extents scrubbed */
 118         __u64 tree_extents_scrubbed;    /* # of tree extents scrubbed */
 119         __u64 data_bytes_scrubbed;      /* # of data bytes scrubbed */
 120         __u64 tree_bytes_scrubbed;      /* # of tree bytes scrubbed */
 121         __u64 read_errors;              /* # of read errors encountered (EIO) */
 122         __u64 csum_errors;              /* # of failed csum checks */
 123         __u64 verify_errors;            /* # of occurrences, where the metadata
 124                                          * of a tree block did not match the
 125                                          * expected values, like generation or
 126                                          * logical */
 127         __u64 no_csum;                  /* # of 4k data block for which no csum
 128                                          * is present, probably the result of
 129                                          * data written with nodatasum */
 130         __u64 csum_discards;            /* # of csum for which no data was found
 131                                          * in the extent tree. */
 132         __u64 super_errors;             /* # of bad super blocks encountered */
 133         __u64 malloc_errors;            /* # of internal kmalloc errors. These
 134                                          * will likely cause an incomplete
 135                                          * scrub */
 136         __u64 uncorrectable_errors;     /* # of errors where either no intact
 137                                          * copy was found or the writeback
 138                                          * failed */
 139         __u64 corrected_errors;         /* # of errors corrected */
 140         __u64 last_physical;            /* last physical address scrubbed. In
 141                                          * case a scrub was aborted, this can
 142                                          * be used to restart the scrub */
 143         __u64 unverified_errors;        /* # of occurrences where a read for a
 144                                          * full (64k) bio failed, but the re-
 145                                          * check succeeded for each 4k piece.
 146                                          * Intermittent error. */
 147 };
 148
 149 #define BTRFS_SCRUB_READONLY    1
 150 struct btrfs_ioctl_scrub_args {
 151         __u64 devid;                            /* in */
 152         __u64 start;                            /* in */
 153         __u64 end;                              /* in */
 154         __u64 flags;                            /* in */
 155         struct btrfs_scrub_progress progress;   /* out */
 156         /* pad to 1k */
 157         __u64 unused[(1024-32-sizeof(struct btrfs_scrub_progress))/8];
 158 };
 159 BUILD_ASSERT(sizeof(struct btrfs_ioctl_scrub_args) == 1024);
 160
 161 #define BTRFS_IOCTL_DEV_REPLACE_CONT_READING_FROM_SRCDEV_MODE_ALWAYS    0
 162 #define BTRFS_IOCTL_DEV_REPLACE_CONT_READING_FROM_SRCDEV_MODE_AVOID     1
 163 struct btrfs_ioctl_dev_replace_start_params {
 164         __u64 srcdevid; /* in, if 0, use srcdev_name instead */
 165         __u64 cont_reading_from_srcdev_mode;    /* in, see #define
 166                                                  * above */
 167         __u8 srcdev_name[BTRFS_DEVICE_PATH_NAME_MAX + 1];       /* in */
 168         __u8 tgtdev_name[BTRFS_DEVICE_PATH_NAME_MAX + 1];       /* in */
 169 };
 170 BUILD_ASSERT(sizeof(struct btrfs_ioctl_dev_replace_start_params) == 2072);
 171
 172 #define BTRFS_IOCTL_DEV_REPLACE_STATE_NEVER_STARTED     0
 173 #define BTRFS_IOCTL_DEV_REPLACE_STATE_STARTED           1
 174 #define BTRFS_IOCTL_DEV_REPLACE_STATE_FINISHED          2
 175 #define BTRFS_IOCTL_DEV_REPLACE_STATE_CANCELED          3
 176 #define BTRFS_IOCTL_DEV_REPLACE_STATE_SUSPENDED         4
 177 struct btrfs_ioctl_dev_replace_status_params {
 178         __u64 replace_state;    /* out, see #define above */
 179         __u64 progress_1000;    /* out, 0 <= x <= 1000 */
 180         __u64 time_started;     /* out, seconds since 1-Jan-1970 */
 181         __u64 time_stopped;     /* out, seconds since 1-Jan-1970 */
 182         __u64 num_write_errors; /* out */
 183         __u64 num_uncorrectable_read_errors;    /* out */
 184 };
 185 BUILD_ASSERT(sizeof(struct btrfs_ioctl_dev_replace_status_params) == 48);
 186
 187 #define BTRFS_IOCTL_DEV_REPLACE_CMD_START                       0
 188 #define BTRFS_IOCTL_DEV_REPLACE_CMD_STATUS                      1
 189 #define BTRFS_IOCTL_DEV_REPLACE_CMD_CANCEL                      2
 190 #define BTRFS_IOCTL_DEV_REPLACE_RESULT_NO_RESULT                -1
 191 #define BTRFS_IOCTL_DEV_REPLACE_RESULT_NO_ERROR                 0
 192 #define BTRFS_IOCTL_DEV_REPLACE_RESULT_NOT_STARTED              1
 193 #define BTRFS_IOCTL_DEV_REPLACE_RESULT_ALREADY_STARTED          2
 194 #define BTRFS_IOCTL_DEV_REPLACE_RESULT_SCRUB_INPROGRESS         3
 195 struct btrfs_ioctl_dev_replace_args {
 196         __u64 cmd;      /* in */
 197         __u64 result;   /* out */
 198
 199         union {
 200                 struct btrfs_ioctl_dev_replace_start_params start;
 201                 struct btrfs_ioctl_dev_replace_status_params status;
 202         };      /* in/out */
 203
 204         __u64 spare[64];
 205 };
 206 BUILD_ASSERT(sizeof(struct btrfs_ioctl_dev_replace_args) == 2600);
 207
 208 struct btrfs_ioctl_dev_info_args {
 209         __u64 devid;                            /* in/out */
 210         __u8 uuid[BTRFS_UUID_SIZE];             /* in/out */
 211         __u64 bytes_used;                       /* out */
 212         __u64 total_bytes;                      /* out */
 213         __u64 unused[379];                      /* pad to 4k */
 214         __u8 path[BTRFS_DEVICE_PATH_NAME_MAX];  /* out */
 215 };
 216 BUILD_ASSERT(sizeof(struct btrfs_ioctl_dev_info_args) == 4096);
 217
 218 struct btrfs_ioctl_fs_info_args {
 219         __u64 max_id;                           /* out */
 220         __u64 num_devices;                      /* out */
 221         __u8 fsid[BTRFS_FSID_SIZE];             /* out */
 222         __u32 nodesize;                         /* out */
 223         __u32 sectorsize;                       /* out */
 224         __u32 clone_alignment;                  /* out */
 225         __u32 reserved32;
 226         __u64 reserved[122];                    /* pad to 1k */
 227 };
 228 BUILD_ASSERT(sizeof(struct btrfs_ioctl_fs_info_args) == 1024);
 229
 230 struct btrfs_ioctl_feature_flags {
 231         __u64 compat_flags;
 232         __u64 compat_ro_flags;
 233         __u64 incompat_flags;
 234 };
 235 BUILD_ASSERT(sizeof(struct btrfs_ioctl_feature_flags) == 24);
 236
 237 /* balance control ioctl modes */
 238 #define BTRFS_BALANCE_CTL_PAUSE         1
 239 #define BTRFS_BALANCE_CTL_CANCEL        2
 240 #define BTRFS_BALANCE_CTL_RESUME        3
 241
 242 /*
 243  * this is packed, because it should be exactly the same as its disk
 244  * byte order counterpart (struct btrfs_disk_balance_args)
 245  */
 246 struct btrfs_balance_args {
 247         __u64 profiles;
 248
 249         /*
 250          * usage filter
 251          * BTRFS_BALANCE_ARGS_USAGE with a single value means '0..N'
 252          * BTRFS_BALANCE_ARGS_USAGE_RANGE - range syntax, min..max
 253          */
 254         union {
 255                 __u64 usage;
 256                 struct {
 257                         __u32 usage_min;
 258                         __u32 usage_max;
 259                 };
 260         };
 261
 262         __u64 devid;
 263         __u64 pstart;
 264         __u64 pend;
 265         __u64 vstart;
 266         __u64 vend;
 267
 268         __u64 target;
 269
 270         __u64 flags;
 271
 272         /*
 273          * BTRFS_BALANCE_ARGS_LIMIT with value 'limit'
 274          * BTRFS_BALANCE_ARGS_LIMIT_RANGE - the extend version can use minimum
 275          * and maximum
 276          */
 277         union {
 278                 __u64 limit;            /* limit number of processed chunks */
 279                 struct {
 280                         __u32 limit_min;
 281                         __u32 limit_max;
 282                 };
 283         };
 284         __u32 stripes_min;
 285         __u32 stripes_max;
 286         __u64 unused[6];
 287 } __attribute__ ((__packed__));
 288
 289 /* report balance progress to userspace */
 290 struct btrfs_balance_progress {
 291         __u64 expected;         /* estimated # of chunks that will be
 292                                  * relocated to fulfil the request */
 293         __u64 considered;       /* # of chunks we have considered so far */
 294         __u64 completed;        /* # of chunks relocated so far */
 295 };
 296
 297 #define BTRFS_BALANCE_STATE_RUNNING     (1ULL << 0)
 298 #define BTRFS_BALANCE_STATE_PAUSE_REQ   (1ULL << 1)
 299 #define BTRFS_BALANCE_STATE_CANCEL_REQ  (1ULL << 2)
 300
 301 struct btrfs_ioctl_balance_args {
 302         __u64 flags;                            /* in/out */
 303         __u64 state;                            /* out */
 304
 305         struct btrfs_balance_args data;         /* in/out */
 306         struct btrfs_balance_args meta;         /* in/out */
 307         struct btrfs_balance_args sys;          /* in/out */
 308
 309         struct btrfs_balance_progress stat;     /* out */
 310
 311         __u64 unused[72];                       /* pad to 1k */
 312 };
 313 BUILD_ASSERT(sizeof(struct btrfs_ioctl_balance_args) == 1024);
 314
 315 #define BTRFS_INO_LOOKUP_PATH_MAX 4080
 316 struct btrfs_ioctl_ino_lookup_args {
 317         __u64 treeid;
 318         __u64 objectid;
 319         char name[BTRFS_INO_LOOKUP_PATH_MAX];
 320 };
 321 BUILD_ASSERT(sizeof(struct btrfs_ioctl_ino_lookup_args) == 4096);
 322
 323 struct btrfs_ioctl_search_key {
 324         /* which root are we searching.  0 is the tree of tree roots */
 325         __u64 tree_id;
 326
 327         /* keys returned will be >= min and <= max */
 328         __u64 min_objectid;
 329         __u64 max_objectid;
 330
 331         /* keys returned will be >= min and <= max */
 332         __u64 min_offset;
 333         __u64 max_offset;
 334
 335         /* max and min transids to search for */
 336         __u64 min_transid;
 337         __u64 max_transid;
 338
 339         /* keys returned will be >= min and <= max */
 340         __u32 min_type;
 341         __u32 max_type;
 342
 343         /*
 344          * how many items did userland ask for, and how many are we
 345          * returning
 346          */
 347         __u32 nr_items;
 348
 349         /* align to 64 bits */
 350         __u32 unused;
 351
 352         /* some extra for later */
 353         __u64 unused1;
 354         __u64 unused2;
 355         __u64 unused3;
 356         __u64 unused4;
 357 };
 358
 359 struct btrfs_ioctl_search_header {
 360         __u64 transid;
 361         __u64 objectid;
 362         __u64 offset;
 363         __u32 type;
 364         __u32 len;
 365 } __attribute__((may_alias));
 366
 367 #define BTRFS_SEARCH_ARGS_BUFSIZE (4096 - sizeof(struct btrfs_ioctl_search_key))
 368 /*
 369  * the buf is an array of search headers where
 370  * each header is followed by the actual item
 371  * the type field is expanded to 32 bits for alignment
 372  */
 373 struct btrfs_ioctl_search_args {
 374         struct btrfs_ioctl_search_key key;
 375         char buf[BTRFS_SEARCH_ARGS_BUFSIZE];
 376 };
 377
 378 /*
 379  * Extended version of TREE_SEARCH ioctl that can return more than 4k of bytes.
 380  * The allocated size of the buffer is set in buf_size.
 381  */
 382 struct btrfs_ioctl_search_args_v2 {
 383         struct btrfs_ioctl_search_key key; /* in/out - search parameters */
 384         __u64 buf_size;                    /* in - size of buffer
 385                                             * out - on EOVERFLOW: needed size
 386                                             *       to store item */
 387         __u64 buf[0];                      /* out - found items */
 388 };
 389 BUILD_ASSERT(sizeof(struct btrfs_ioctl_search_args_v2) == 112);
 390
 391 /* With a @src_length of zero, the range from @src_offset->EOF is cloned! */
 392 struct btrfs_ioctl_clone_range_args {
 393         __s64 src_fd;
 394         __u64 src_offset, src_length;
 395         __u64 dest_offset;
 396 };
 397 BUILD_ASSERT(sizeof(struct btrfs_ioctl_clone_range_args) == 32);
 398
 399 /* flags for the defrag range ioctl */
 400 #define BTRFS_DEFRAG_RANGE_COMPRESS 1
 401 #define BTRFS_DEFRAG_RANGE_START_IO 2
 402
 403 #define BTRFS_SAME_DATA_DIFFERS 1
 404 /* For extent-same ioctl */
 405 struct btrfs_ioctl_same_extent_info {
 406         __s64 fd;               /* in - destination file */
 407         __u64 logical_offset;   /* in - start of extent in destination */
 408         __u64 bytes_deduped;    /* out - total # of bytes we were able
 409                                  * to dedupe from this file */
 410         /* status of this dedupe operation:
 411          * 0 if dedup succeeds
 412          * < 0 for error
 413          * == BTRFS_SAME_DATA_DIFFERS if data differs
 414          */
 415         __s32 status;           /* out - see above description */
 416         __u32 reserved;
 417 };
 418
 419 struct btrfs_ioctl_same_args {
 420         __u64 logical_offset;   /* in - start of extent in source */
 421         __u64 length;           /* in - length of extent */
 422         __u16 dest_count;       /* in - total elements in info array */
 423         __u16 reserved1;
 424         __u32 reserved2;
 425         struct btrfs_ioctl_same_extent_info info[0];
 426 };
 427 BUILD_ASSERT(sizeof(struct btrfs_ioctl_same_args) == 24);
 428
 429 struct btrfs_ioctl_defrag_range_args {
 430         /* start of the defrag operation */
 431         __u64 start;
 432
 433         /* number of bytes to defrag, use (u64)-1 to say all */
 434         __u64 len;
 435
 436         /*
 437          * flags for the operation, which can include turning
 438          * on compression for this one defrag
 439          */
 440         __u64 flags;
 441
 442         /*
 443          * any extent bigger than this will be considered
 444          * already defragged.  Use 0 to take the kernel default
 445          * Use 1 to say every single extent must be rewritten
 446          */
 447         __u32 extent_thresh;
 448
 449         /*
 450          * which compression method to use if turning on compression
 451          * for this defrag operation.  If unspecified, zlib will
 452          * be used
 453          */
 454         __u32 compress_type;
 455
 456         /* spare for later */
 457         __u32 unused[4];
 458 };
 459 BUILD_ASSERT(sizeof(struct btrfs_ioctl_defrag_range_args) == 48);
 460
 461 struct btrfs_ioctl_space_info {
 462         __u64 flags;
 463         __u64 total_bytes;
 464         __u64 used_bytes;
 465 };
 466
 467 struct btrfs_ioctl_space_args {
 468         __u64 space_slots;
 469         __u64 total_spaces;
 470         struct btrfs_ioctl_space_info spaces[0];
 471 };
 472 BUILD_ASSERT(sizeof(struct btrfs_ioctl_space_args) == 16);
 473
 474 struct btrfs_data_container {
 475         __u32   bytes_left;     /* out -- bytes not needed to deliver output */
 476         __u32   bytes_missing;  /* out -- additional bytes needed for result */
 477         __u32   elem_cnt;       /* out */
 478         __u32   elem_missed;    /* out */
 479         __u64   val[0];         /* out */
 480 };
 481
 482 struct btrfs_ioctl_ino_path_args {
 483         __u64                           inum;           /* in */
 484         __u64                           size;           /* in */
 485         __u64                           reserved[4];
 486         /* struct btrfs_data_container  *fspath;           out */
 487         __u64                           fspath;         /* out */
 488 };
 489 BUILD_ASSERT(sizeof(struct btrfs_ioctl_ino_path_args) == 56);
 490
 491 struct btrfs_ioctl_logical_ino_args {
 492         __u64                           logical;        /* in */
 493         __u64                           size;           /* in */
 494         __u64                           reserved[4];
 495         /* struct btrfs_data_container  *inodes;        out   */
 496         __u64                           inodes;
 497 };
 498
 499 enum btrfs_dev_stat_values {
 500         /* disk I/O failure stats */
 501         BTRFS_DEV_STAT_WRITE_ERRS, /* EIO or EREMOTEIO from lower layers */
 502         BTRFS_DEV_STAT_READ_ERRS, /* EIO or EREMOTEIO from lower layers */
 503         BTRFS_DEV_STAT_FLUSH_ERRS, /* EIO or EREMOTEIO from lower layers */
 504
 505         /* stats for indirect indications for I/O failures */
 506         BTRFS_DEV_STAT_CORRUPTION_ERRS, /* checksum error, bytenr error or
 507                                          * contents is illegal: this is an
 508                                          * indication that the block was damaged
 509                                          * during read or write, or written to
 510                                          * wrong location or read from wrong
 511                                          * location */
 512         BTRFS_DEV_STAT_GENERATION_ERRS, /* an indication that blocks have not
 513                                          * been written */
 514
 515         BTRFS_DEV_STAT_VALUES_MAX
 516 };
 517
 518 /* Reset statistics after reading; needs SYS_ADMIN capability */
 519 #define BTRFS_DEV_STATS_RESET           (1ULL << 0)
 520
 521 struct btrfs_ioctl_get_dev_stats {
 522         __u64 devid;                            /* in */
 523         __u64 nr_items;                         /* in/out */
 524         __u64 flags;                            /* in/out */
 525
 526         /* out values: */
 527         __u64 values[BTRFS_DEV_STAT_VALUES_MAX];
 528
 529         __u64 unused[128 - 2 - BTRFS_DEV_STAT_VALUES_MAX]; /* pad to 1k + 8B */
 530 };
 531 BUILD_ASSERT(sizeof(struct btrfs_ioctl_get_dev_stats) == 1032);
 532
 533 /* BTRFS_IOC_SNAP_CREATE is no longer used by the btrfs command */
 534 #define BTRFS_QUOTA_CTL_ENABLE  1
 535 #define BTRFS_QUOTA_CTL_DISABLE 2
 536 /* 3 has formerly been reserved for BTRFS_QUOTA_CTL_RESCAN */
 537 struct btrfs_ioctl_quota_ctl_args {
 538         __u64 cmd;
 539         __u64 status;
 540 };
 541 BUILD_ASSERT(sizeof(struct btrfs_ioctl_quota_ctl_args) == 16);
 542
 543 struct btrfs_ioctl_quota_rescan_args {
 544         __u64   flags;
 545         __u64   progress;
 546         __u64   reserved[6];
 547 };
 548 BUILD_ASSERT(sizeof(struct btrfs_ioctl_quota_rescan_args) == 64);
 549
 550 struct btrfs_ioctl_qgroup_assign_args {
 551         __u64 assign;
 552         __u64 src;
 553         __u64 dst;
 554 };
 555
 556 struct btrfs_ioctl_qgroup_create_args {
 557         __u64 create;
 558         __u64 qgroupid;
 559 };
 560 BUILD_ASSERT(sizeof(struct btrfs_ioctl_qgroup_create_args) == 16);
 561
 562 struct btrfs_ioctl_timespec {
 563         __u64 sec;
 564         __u32 nsec;
 565 };
 566
 567 struct btrfs_ioctl_received_subvol_args {
 568         char    uuid[BTRFS_UUID_SIZE];  /* in */
 569         __u64   stransid;               /* in */
 570         __u64   rtransid;               /* out */
 571         struct btrfs_ioctl_timespec stime; /* in */
 572         struct btrfs_ioctl_timespec rtime; /* out */
 573         __u64   flags;                  /* in */
 574         __u64   reserved[16];           /* in */
 575 };
 576 BUILD_ASSERT(sizeof(struct btrfs_ioctl_received_subvol_args) == 200);
 577
 578 /*
 579  * If we have a 32-bit userspace and 64-bit kernel, then the UAPI
 580  * structures are incorrect, as the timespec structure from userspace
 581  * is 4 bytes too small. We define these alternatives here for backward
 582  * compatibility, the kernel understands both values.
 583  */
 584
 585 /*
 586  * Structure size is different on 32bit and 64bit, has some padding if the
 587  * structure is embedded. Packing makes sure the size is same on both, but will
 588  * be misaligned on 64bit.
 589  *
 590  * NOTE: do not use in your code, this is for testing only
 591  */
 592 struct btrfs_ioctl_timespec_32 {
 593         __u64 sec;
 594         __u32 nsec;
 595 } __attribute__ ((__packed__));
 596
 597 struct btrfs_ioctl_received_subvol_args_32 {
 598         char    uuid[BTRFS_UUID_SIZE];  /* in */
 599         __u64   stransid;               /* in */
 600         __u64   rtransid;               /* out */
 601         struct btrfs_ioctl_timespec_32 stime; /* in */
 602         struct btrfs_ioctl_timespec_32 rtime; /* out */
 603         __u64   flags;                  /* in */
 604         __u64   reserved[16];           /* in */
 605 } __attribute__ ((__packed__));
 606 BUILD_ASSERT(sizeof(struct btrfs_ioctl_received_subvol_args_32) == 192);
 607
 608 #define BTRFS_IOC_SET_RECEIVED_SUBVOL_32_COMPAT_DEFINED 1
 609
 610 /*
 611  * Caller doesn't want file data in the send stream, even if the
 612  * search of clone sources doesn't find an extent. UPDATE_EXTENT
 613  * commands will be sent instead of WRITE commands.
 614  */
 615 #define BTRFS_SEND_FLAG_NO_FILE_DATA            0x1
 616
 617 /*
 618  * Do not add the leading stream header. Used when multiple snapshots
 619  * are sent back to back.
 620  */
 621 #define BTRFS_SEND_FLAG_OMIT_STREAM_HEADER      0x2
 622
 623 /*
 624  * Omit the command at the end of the stream that indicated the end
 625  * of the stream. This option is used when multiple snapshots are
 626  * sent back to back.
 627  */
 628 #define BTRFS_SEND_FLAG_OMIT_END_CMD            0x4
 629
 630 #define BTRFS_SEND_FLAG_MASK \
 631         (BTRFS_SEND_FLAG_NO_FILE_DATA | \
 632          BTRFS_SEND_FLAG_OMIT_STREAM_HEADER | \
 633          BTRFS_SEND_FLAG_OMIT_END_CMD)
 634
 635 struct btrfs_ioctl_send_args {
 636         __s64 send_fd;                  /* in */
 637         __u64 clone_sources_count;      /* in */
 638         __u64 __user *clone_sources;    /* in */
 639         __u64 parent_root;              /* in */
 640         __u64 flags;                    /* in */
 641         __u64 reserved[4];              /* in */
 642 };
 643 /*
 644  * Size of structure depends on pointer width, was not caught in the early
 645  * days.  Kernel handles pointer width differences transparently.
 646  */
 647 BUILD_ASSERT(sizeof(__u64 *) == 8
 648              ? sizeof(struct btrfs_ioctl_send_args) == 72
 649              : (sizeof(void *) == 4
 650                 ? sizeof(struct btrfs_ioctl_send_args) == 68
 651                 : 0));
 652
 653 /*
 654  * Different pointer width leads to structure size change. Kernel should accept
 655  * both ioctl values (derived from the structures) for backward compatibility.
 656  * Size of this structure is same on 32bit and 64bit though.
 657  *
 658  * NOTE: do not use in your code, this is for testing only
 659  */
 660 struct btrfs_ioctl_send_args_64 {
 661         __s64 send_fd;                  /* in */
 662         __u64 clone_sources_count;      /* in */
 663         union {
 664                 __u64 __user *clone_sources;    /* in */
 665                 __u64 __clone_sources_alignment;
 666         };
 667         __u64 parent_root;              /* in */
 668         __u64 flags;                    /* in */
 669         __u64 reserved[4];              /* in */
 670 } __attribute__((packed));
 671 BUILD_ASSERT(sizeof(struct btrfs_ioctl_send_args_64) == 72);
 672
 673 #define BTRFS_IOC_SEND_64_COMPAT_DEFINED 1
 674
 675 /* Error codes as returned by the kernel */
 676 enum btrfs_err_code {
 677         notused,
 678         BTRFS_ERROR_DEV_RAID1_MIN_NOT_MET,
 679         BTRFS_ERROR_DEV_RAID10_MIN_NOT_MET,
 680         BTRFS_ERROR_DEV_RAID5_MIN_NOT_MET,
 681         BTRFS_ERROR_DEV_RAID6_MIN_NOT_MET,
 682         BTRFS_ERROR_DEV_TGT_REPLACE,
 683         BTRFS_ERROR_DEV_MISSING_NOT_FOUND,
 684         BTRFS_ERROR_DEV_ONLY_WRITABLE,
 685         BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS
 686 };
 687
 688 /* An error code to error string mapping for the kernel
 689 *  error codes
 690 */
 691 static inline char *btrfs_err_str(enum btrfs_err_code err_code)
 692 {
 693         switch (err_code) {
 694                 case BTRFS_ERROR_DEV_RAID1_MIN_NOT_MET:
 695                         return "unable to go below two devices on raid1";
 696                 case BTRFS_ERROR_DEV_RAID10_MIN_NOT_MET:
 697                         return "unable to go below four devices on raid10";
 698                 case BTRFS_ERROR_DEV_RAID5_MIN_NOT_MET:
 699                         return "unable to go below two devices on raid5";
 700                 case BTRFS_ERROR_DEV_RAID6_MIN_NOT_MET:
 701                         return "unable to go below three devices on raid6";
 702                 case BTRFS_ERROR_DEV_TGT_REPLACE:
 703                         return "unable to remove the dev_replace target dev";
 704                 case BTRFS_ERROR_DEV_MISSING_NOT_FOUND:
 705                         return "no missing devices found to remove";
 706                 case BTRFS_ERROR_DEV_ONLY_WRITABLE:
 707                         return "unable to remove the only writeable device";
 708                 case BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS:
 709                         return "add/delete/balance/replace/resize operation "
 710                                 "in progress";
 711                 default:
 712                         return NULL;
 713         }
 714 }
 715
 716 #define BTRFS_IOC_SNAP_CREATE _IOW(BTRFS_IOCTL_MAGIC, 1, \
 717                                    struct btrfs_ioctl_vol_args)
 718 #define BTRFS_IOC_DEFRAG _IOW(BTRFS_IOCTL_MAGIC, 2, \
 719                                    struct btrfs_ioctl_vol_args)
 720 #define BTRFS_IOC_RESIZE _IOW(BTRFS_IOCTL_MAGIC, 3, \
 721                                    struct btrfs_ioctl_vol_args)
 722 #define BTRFS_IOC_SCAN_DEV _IOW(BTRFS_IOCTL_MAGIC, 4, \
 723                                    struct btrfs_ioctl_vol_args)
 724 /* trans start and trans end are dangerous, and only for
 725  * use by applications that know how to avoid the
 726  * resulting deadlocks
 727  */
 728 #define BTRFS_IOC_TRANS_START  _IO(BTRFS_IOCTL_MAGIC, 6)
 729 #define BTRFS_IOC_TRANS_END    _IO(BTRFS_IOCTL_MAGIC, 7)
 730 #define BTRFS_IOC_SYNC         _IO(BTRFS_IOCTL_MAGIC, 8)
 731
 732 #define BTRFS_IOC_CLONE        _IOW(BTRFS_IOCTL_MAGIC, 9, int)
 733 #define BTRFS_IOC_ADD_DEV _IOW(BTRFS_IOCTL_MAGIC, 10, \
 734                                    struct btrfs_ioctl_vol_args)
 735 #define BTRFS_IOC_RM_DEV _IOW(BTRFS_IOCTL_MAGIC, 11, \
 736                                    struct btrfs_ioctl_vol_args)
 737 #define BTRFS_IOC_BALANCE _IOW(BTRFS_IOCTL_MAGIC, 12, \
 738                                    struct btrfs_ioctl_vol_args)
 739
 740 #define BTRFS_IOC_CLONE_RANGE _IOW(BTRFS_IOCTL_MAGIC, 13, \
 741                                    struct btrfs_ioctl_clone_range_args)
 742
 743 #define BTRFS_IOC_SUBVOL_CREATE _IOW(BTRFS_IOCTL_MAGIC, 14, \
 744                                    struct btrfs_ioctl_vol_args)
 745 #define BTRFS_IOC_SNAP_DESTROY _IOW(BTRFS_IOCTL_MAGIC, 15, \
 746                                    struct btrfs_ioctl_vol_args)
 747 #define BTRFS_IOC_DEFRAG_RANGE _IOW(BTRFS_IOCTL_MAGIC, 16, \
 748                                 struct btrfs_ioctl_defrag_range_args)
 749 #define BTRFS_IOC_TREE_SEARCH _IOWR(BTRFS_IOCTL_MAGIC, 17, \
 750                                    struct btrfs_ioctl_search_args)
 751 #define BTRFS_IOC_TREE_SEARCH_V2 _IOWR(BTRFS_IOCTL_MAGIC, 17, \
 752                                    struct btrfs_ioctl_search_args_v2)
 753 #define BTRFS_IOC_INO_LOOKUP _IOWR(BTRFS_IOCTL_MAGIC, 18, \
 754                                    struct btrfs_ioctl_ino_lookup_args)
 755 #define BTRFS_IOC_DEFAULT_SUBVOL _IOW(BTRFS_IOCTL_MAGIC, 19, __u64)
 756 #define BTRFS_IOC_SPACE_INFO _IOWR(BTRFS_IOCTL_MAGIC, 20, \
 757                                     struct btrfs_ioctl_space_args)
 758 #define BTRFS_IOC_START_SYNC _IOR(BTRFS_IOCTL_MAGIC, 24, __u64)
 759 #define BTRFS_IOC_WAIT_SYNC  _IOW(BTRFS_IOCTL_MAGIC, 22, __u64)
 760 #define BTRFS_IOC_SNAP_CREATE_V2 _IOW(BTRFS_IOCTL_MAGIC, 23, \
 761                                    struct btrfs_ioctl_vol_args_v2)
 762 #define BTRFS_IOC_SUBVOL_CREATE_V2 _IOW(BTRFS_IOCTL_MAGIC, 24, \
 763                                    struct btrfs_ioctl_vol_args_v2)
 764 #define BTRFS_IOC_SUBVOL_GETFLAGS _IOR(BTRFS_IOCTL_MAGIC, 25, __u64)
 765 #define BTRFS_IOC_SUBVOL_SETFLAGS _IOW(BTRFS_IOCTL_MAGIC, 26, __u64)
 766 #define BTRFS_IOC_SCRUB _IOWR(BTRFS_IOCTL_MAGIC, 27, \
 767                                 struct btrfs_ioctl_scrub_args)
 768 #define BTRFS_IOC_SCRUB_CANCEL _IO(BTRFS_IOCTL_MAGIC, 28)
 769 #define BTRFS_IOC_SCRUB_PROGRESS _IOWR(BTRFS_IOCTL_MAGIC, 29, \
 770                                         struct btrfs_ioctl_scrub_args)
 771 #define BTRFS_IOC_DEV_INFO _IOWR(BTRFS_IOCTL_MAGIC, 30, \
 772                                         struct btrfs_ioctl_dev_info_args)
 773 #define BTRFS_IOC_FS_INFO _IOR(BTRFS_IOCTL_MAGIC, 31, \
 774                                  struct btrfs_ioctl_fs_info_args)
 775 #define BTRFS_IOC_BALANCE_V2 _IOWR(BTRFS_IOCTL_MAGIC, 32, \
 776                                    struct btrfs_ioctl_balance_args)
 777 #define BTRFS_IOC_BALANCE_CTL _IOW(BTRFS_IOCTL_MAGIC, 33, int)
 778 #define BTRFS_IOC_BALANCE_PROGRESS _IOR(BTRFS_IOCTL_MAGIC, 34, \
 779                                         struct btrfs_ioctl_balance_args)
 780 #define BTRFS_IOC_INO_PATHS _IOWR(BTRFS_IOCTL_MAGIC, 35, \
 781                                         struct btrfs_ioctl_ino_path_args)
 782 #define BTRFS_IOC_LOGICAL_INO _IOWR(BTRFS_IOCTL_MAGIC, 36, \
 783                                         struct btrfs_ioctl_logical_ino_args)
 784 #define BTRFS_IOC_SET_RECEIVED_SUBVOL _IOWR(BTRFS_IOCTL_MAGIC, 37, \
 785                                 struct btrfs_ioctl_received_subvol_args)
 786
 787 #ifdef BTRFS_IOC_SET_RECEIVED_SUBVOL_32_COMPAT_DEFINED
 788 #define BTRFS_IOC_SET_RECEIVED_SUBVOL_32 _IOWR(BTRFS_IOCTL_MAGIC, 37, \
 789                                 struct btrfs_ioctl_received_subvol_args_32)
 790 #endif
 791
 792 #ifdef BTRFS_IOC_SEND_64_COMPAT_DEFINED
 793 #define BTRFS_IOC_SEND_64 _IOW(BTRFS_IOCTL_MAGIC, 38, \
 794                 struct btrfs_ioctl_send_args_64)
 795 #endif
 796
 797 #define BTRFS_IOC_SEND _IOW(BTRFS_IOCTL_MAGIC, 38, struct btrfs_ioctl_send_args)
 798 #define BTRFS_IOC_DEVICES_READY _IOR(BTRFS_IOCTL_MAGIC, 39, \
 799                                      struct btrfs_ioctl_vol_args)
 800 #define BTRFS_IOC_QUOTA_CTL _IOWR(BTRFS_IOCTL_MAGIC, 40, \
 801                                         struct btrfs_ioctl_quota_ctl_args)
 802 #define BTRFS_IOC_QGROUP_ASSIGN _IOW(BTRFS_IOCTL_MAGIC, 41, \
 803                                         struct btrfs_ioctl_qgroup_assign_args)
 804 #define BTRFS_IOC_QGROUP_CREATE _IOW(BTRFS_IOCTL_MAGIC, 42, \
 805                                         struct btrfs_ioctl_qgroup_create_args)
 806 #define BTRFS_IOC_QGROUP_LIMIT _IOR(BTRFS_IOCTL_MAGIC, 43, \
 807                                         struct btrfs_ioctl_qgroup_limit_args)
 808 #define BTRFS_IOC_QUOTA_RESCAN _IOW(BTRFS_IOCTL_MAGIC, 44, \
 809                                struct btrfs_ioctl_quota_rescan_args)
 810 #define BTRFS_IOC_QUOTA_RESCAN_STATUS _IOR(BTRFS_IOCTL_MAGIC, 45, \
 811                                struct btrfs_ioctl_quota_rescan_args)
 812 #define BTRFS_IOC_QUOTA_RESCAN_WAIT _IO(BTRFS_IOCTL_MAGIC, 46)
 813 #define BTRFS_IOC_GET_FSLABEL _IOR(BTRFS_IOCTL_MAGIC, 49, \
 814                                    char[BTRFS_LABEL_SIZE])
 815 #define BTRFS_IOC_SET_FSLABEL _IOW(BTRFS_IOCTL_MAGIC, 50, \
 816                                    char[BTRFS_LABEL_SIZE])
 817 #define BTRFS_IOC_GET_DEV_STATS _IOWR(BTRFS_IOCTL_MAGIC, 52, \
 818                                       struct btrfs_ioctl_get_dev_stats)
 819 #define BTRFS_IOC_DEV_REPLACE _IOWR(BTRFS_IOCTL_MAGIC, 53, \
 820                                     struct btrfs_ioctl_dev_replace_args)
 821 #define BTRFS_IOC_FILE_EXTENT_SAME _IOWR(BTRFS_IOCTL_MAGIC, 54, \
 822                                          struct btrfs_ioctl_same_args)
 823 #define BTRFS_IOC_GET_FEATURES _IOR(BTRFS_IOCTL_MAGIC, 57, \
 824                                   struct btrfs_ioctl_feature_flags)
 825 #define BTRFS_IOC_SET_FEATURES _IOW(BTRFS_IOCTL_MAGIC, 57, \
 826                                   struct btrfs_ioctl_feature_flags[2])
 827 #define BTRFS_IOC_GET_SUPPORTED_FEATURES _IOR(BTRFS_IOCTL_MAGIC, 57, \
 828                                   struct btrfs_ioctl_feature_flags[3])
 829 #define BTRFS_IOC_RM_DEV_V2     _IOW(BTRFS_IOCTL_MAGIC, 58, \
 830                                    struct btrfs_ioctl_vol_args_v2)
 831 #ifdef __cplusplus
 832 }
 833 #endif
 834
 835 #endif