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