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