LXR linux/include/uapi/linux/btrfs.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 _UAPI_LINUX_BTRFS_H
  20#define _UAPI_LINUX_BTRFS_H
  21#include <linux/types.h>
  22#include <linux/ioctl.h>
  23
  24#define BTRFS_IOCTL_MAGIC 0x94
  25#define BTRFS_VOL_NAME_MAX 255
  26
  27/* this should be 4k */
  28#define BTRFS_PATH_NAME_MAX 4087
  29struct btrfs_ioctl_vol_args {
  30        __s64 fd;
  31        char name[BTRFS_PATH_NAME_MAX + 1];
  32};
  33
  34#define BTRFS_DEVICE_PATH_NAME_MAX 1024
  35
  36#define BTRFS_SUBVOL_CREATE_ASYNC       (1ULL << 0)
  37#define BTRFS_SUBVOL_RDONLY             (1ULL << 1)
  38#define BTRFS_SUBVOL_QGROUP_INHERIT     (1ULL << 2)
  39#define BTRFS_FSID_SIZE 16
  40#define BTRFS_UUID_SIZE 16
  41
  42#define BTRFS_QGROUP_INHERIT_SET_LIMITS (1ULL << 0)
  43
  44struct btrfs_qgroup_limit {
  45        __u64   flags;
  46        __u64   max_rfer;
  47        __u64   max_excl;
  48        __u64   rsv_rfer;
  49        __u64   rsv_excl;
  50};
  51
  52struct btrfs_qgroup_inherit {
  53        __u64   flags;
  54        __u64   num_qgroups;
  55        __u64   num_ref_copies;
  56        __u64   num_excl_copies;
  57        struct btrfs_qgroup_limit lim;
  58        __u64   qgroups[0];
  59};
  60
  61struct btrfs_ioctl_qgroup_limit_args {
  62        __u64   qgroupid;
  63        struct btrfs_qgroup_limit lim;
  64};
  65
  66#define BTRFS_SUBVOL_NAME_MAX 4039
  67struct btrfs_ioctl_vol_args_v2 {
  68        __s64 fd;
  69        __u64 transid;
  70        __u64 flags;
  71        union {
  72                struct {
  73                        __u64 size;
  74                        struct btrfs_qgroup_inherit __user *qgroup_inherit;
  75                };
  76                __u64 unused[4];
  77        };
  78        char name[BTRFS_SUBVOL_NAME_MAX + 1];
  79};
  80
  81/*
  82 * structure to report errors and progress to userspace, either as a
  83 * result of a finished scrub, a canceled scrub or a progress inquiry
  84 */
  85struct btrfs_scrub_progress {
  86        __u64 data_extents_scrubbed;    /* # of data extents scrubbed */
  87        __u64 tree_extents_scrubbed;    /* # of tree extents scrubbed */
  88        __u64 data_bytes_scrubbed;      /* # of data bytes scrubbed */
  89        __u64 tree_bytes_scrubbed;      /* # of tree bytes scrubbed */
  90        __u64 read_errors;              /* # of read errors encountered (EIO) */
  91        __u64 csum_errors;              /* # of failed csum checks */
  92        __u64 verify_errors;            /* # of occurences, where the metadata
  93                                         * of a tree block did not match the
  94                                         * expected values, like generation or
  95                                         * logical */
  96        __u64 no_csum;                  /* # of 4k data block for which no csum
  97                                         * is present, probably the result of
  98                                         * data written with nodatasum */
  99        __u64 csum_discards;            /* # of csum for which no data was found
 100                                         * in the extent tree. */
 101        __u64 super_errors;             /* # of bad super blocks encountered */
 102        __u64 malloc_errors;            /* # of internal kmalloc errors. These
 103                                         * will likely cause an incomplete
 104                                         * scrub */
 105        __u64 uncorrectable_errors;     /* # of errors where either no intact
 106                                         * copy was found or the writeback
 107                                         * failed */
 108        __u64 corrected_errors;         /* # of errors corrected */
 109        __u64 last_physical;            /* last physical address scrubbed. In
 110                                         * case a scrub was aborted, this can
 111                                         * be used to restart the scrub */
 112        __u64 unverified_errors;        /* # of occurences where a read for a
 113                                         * full (64k) bio failed, but the re-
 114                                         * check succeeded for each 4k piece.
 115                                         * Intermittent error. */
 116};
 117
 118#define BTRFS_SCRUB_READONLY    1
 119struct btrfs_ioctl_scrub_args {
 120        __u64 devid;                            /* in */
 121        __u64 start;                            /* in */
 122        __u64 end;                              /* in */
 123        __u64 flags;                            /* in */
 124        struct btrfs_scrub_progress progress;   /* out */
 125        /* pad to 1k */
 126        __u64 unused[(1024-32-sizeof(struct btrfs_scrub_progress))/8];
 127};
 128
 129#define BTRFS_IOCTL_DEV_REPLACE_CONT_READING_FROM_SRCDEV_MODE_ALWAYS    0
 130#define BTRFS_IOCTL_DEV_REPLACE_CONT_READING_FROM_SRCDEV_MODE_AVOID     1
 131struct btrfs_ioctl_dev_replace_start_params {
 132        __u64 srcdevid; /* in, if 0, use srcdev_name instead */
 133        __u64 cont_reading_from_srcdev_mode;    /* in, see #define
 134                                                 * above */
 135        __u8 srcdev_name[BTRFS_DEVICE_PATH_NAME_MAX + 1];       /* in */
 136        __u8 tgtdev_name[BTRFS_DEVICE_PATH_NAME_MAX + 1];       /* in */
 137};
 138
 139#define BTRFS_IOCTL_DEV_REPLACE_STATE_NEVER_STARTED     0
 140#define BTRFS_IOCTL_DEV_REPLACE_STATE_STARTED           1
 141#define BTRFS_IOCTL_DEV_REPLACE_STATE_FINISHED          2
 142#define BTRFS_IOCTL_DEV_REPLACE_STATE_CANCELED          3
 143#define BTRFS_IOCTL_DEV_REPLACE_STATE_SUSPENDED         4
 144struct btrfs_ioctl_dev_replace_status_params {
 145        __u64 replace_state;    /* out, see #define above */
 146        __u64 progress_1000;    /* out, 0 <= x <= 1000 */
 147        __u64 time_started;     /* out, seconds since 1-Jan-1970 */
 148        __u64 time_stopped;     /* out, seconds since 1-Jan-1970 */
 149        __u64 num_write_errors; /* out */
 150        __u64 num_uncorrectable_read_errors;    /* out */
 151};
 152
 153#define BTRFS_IOCTL_DEV_REPLACE_CMD_START                       0
 154#define BTRFS_IOCTL_DEV_REPLACE_CMD_STATUS                      1
 155#define BTRFS_IOCTL_DEV_REPLACE_CMD_CANCEL                      2
 156#define BTRFS_IOCTL_DEV_REPLACE_RESULT_NO_ERROR                 0
 157#define BTRFS_IOCTL_DEV_REPLACE_RESULT_NOT_STARTED              1
 158#define BTRFS_IOCTL_DEV_REPLACE_RESULT_ALREADY_STARTED          2
 159struct btrfs_ioctl_dev_replace_args {
 160        __u64 cmd;      /* in */
 161        __u64 result;   /* out */
 162
 163        union {
 164                struct btrfs_ioctl_dev_replace_start_params start;
 165                struct btrfs_ioctl_dev_replace_status_params status;
 166        };      /* in/out */
 167
 168        __u64 spare[64];
 169};
 170
 171struct btrfs_ioctl_dev_info_args {
 172        __u64 devid;                            /* in/out */
 173        __u8 uuid[BTRFS_UUID_SIZE];             /* in/out */
 174        __u64 bytes_used;                       /* out */
 175        __u64 total_bytes;                      /* out */
 176        __u64 unused[379];                      /* pad to 4k */
 177        __u8 path[BTRFS_DEVICE_PATH_NAME_MAX];  /* out */
 178};
 179
 180struct btrfs_ioctl_fs_info_args {
 181        __u64 max_id;                           /* out */
 182        __u64 num_devices;                      /* out */
 183        __u8 fsid[BTRFS_FSID_SIZE];             /* out */
 184        __u64 reserved[124];                    /* pad to 1k */
 185};
 186
 187/* balance control ioctl modes */
 188#define BTRFS_BALANCE_CTL_PAUSE         1
 189#define BTRFS_BALANCE_CTL_CANCEL        2
 190
 191/*
 192 * this is packed, because it should be exactly the same as its disk
 193 * byte order counterpart (struct btrfs_disk_balance_args)
 194 */
 195struct btrfs_balance_args {
 196        __u64 profiles;
 197        __u64 usage;
 198        __u64 devid;
 199        __u64 pstart;
 200        __u64 pend;
 201        __u64 vstart;
 202        __u64 vend;
 203
 204        __u64 target;
 205
 206        __u64 flags;
 207
 208        __u64 unused[8];
 209} __attribute__ ((__packed__));
 210
 211/* report balance progress to userspace */
 212struct btrfs_balance_progress {
 213        __u64 expected;         /* estimated # of chunks that will be
 214                                 * relocated to fulfill the request */
 215        __u64 considered;       /* # of chunks we have considered so far */
 216        __u64 completed;        /* # of chunks relocated so far */
 217};
 218
 219#define BTRFS_BALANCE_STATE_RUNNING     (1ULL << 0)
 220#define BTRFS_BALANCE_STATE_PAUSE_REQ   (1ULL << 1)
 221#define BTRFS_BALANCE_STATE_CANCEL_REQ  (1ULL << 2)
 222
 223struct btrfs_ioctl_balance_args {
 224        __u64 flags;                            /* in/out */
 225        __u64 state;                            /* out */
 226
 227        struct btrfs_balance_args data;         /* in/out */
 228        struct btrfs_balance_args meta;         /* in/out */
 229        struct btrfs_balance_args sys;          /* in/out */
 230
 231        struct btrfs_balance_progress stat;     /* out */
 232
 233        __u64 unused[72];                       /* pad to 1k */
 234};
 235
 236#define BTRFS_INO_LOOKUP_PATH_MAX 4080
 237struct btrfs_ioctl_ino_lookup_args {
 238        __u64 treeid;
 239        __u64 objectid;
 240        char name[BTRFS_INO_LOOKUP_PATH_MAX];
 241};
 242
 243struct btrfs_ioctl_search_key {
 244        /* which root are we searching.  0 is the tree of tree roots */
 245        __u64 tree_id;
 246
 247        /* keys returned will be >= min and <= max */
 248        __u64 min_objectid;
 249        __u64 max_objectid;
 250
 251        /* keys returned will be >= min and <= max */
 252        __u64 min_offset;
 253        __u64 max_offset;
 254
 255        /* max and min transids to search for */
 256        __u64 min_transid;
 257        __u64 max_transid;
 258
 259        /* keys returned will be >= min and <= max */
 260        __u32 min_type;
 261        __u32 max_type;
 262
 263        /*
 264         * how many items did userland ask for, and how many are we
 265         * returning
 266         */
 267        __u32 nr_items;
 268
 269        /* align to 64 bits */
 270        __u32 unused;
 271
 272        /* some extra for later */
 273        __u64 unused1;
 274        __u64 unused2;
 275        __u64 unused3;
 276        __u64 unused4;
 277};
 278
 279struct btrfs_ioctl_search_header {
 280        __u64 transid;
 281        __u64 objectid;
 282        __u64 offset;
 283        __u32 type;
 284        __u32 len;
 285};
 286
 287#define BTRFS_SEARCH_ARGS_BUFSIZE (4096 - sizeof(struct btrfs_ioctl_search_key))
 288/*
 289 * the buf is an array of search headers where
 290 * each header is followed by the actual item
 291 * the type field is expanded to 32 bits for alignment
 292 */
 293struct btrfs_ioctl_search_args {
 294        struct btrfs_ioctl_search_key key;
 295        char buf[BTRFS_SEARCH_ARGS_BUFSIZE];
 296};
 297
 298struct btrfs_ioctl_clone_range_args {
 299  __s64 src_fd;
 300  __u64 src_offset, src_length;
 301  __u64 dest_offset;
 302};
 303
 304/* flags for the defrag range ioctl */
 305#define BTRFS_DEFRAG_RANGE_COMPRESS 1
 306#define BTRFS_DEFRAG_RANGE_START_IO 2
 307
 308struct btrfs_ioctl_space_info {
 309        __u64 flags;
 310        __u64 total_bytes;
 311        __u64 used_bytes;
 312};
 313
 314struct btrfs_ioctl_space_args {
 315        __u64 space_slots;
 316        __u64 total_spaces;
 317        struct btrfs_ioctl_space_info spaces[0];
 318};
 319
 320struct btrfs_data_container {
 321        __u32   bytes_left;     /* out -- bytes not needed to deliver output */
 322        __u32   bytes_missing;  /* out -- additional bytes needed for result */
 323        __u32   elem_cnt;       /* out */
 324        __u32   elem_missed;    /* out */
 325        __u64   val[0];         /* out */
 326};
 327
 328struct btrfs_ioctl_ino_path_args {
 329        __u64                           inum;           /* in */
 330        __u64                           size;           /* in */
 331        __u64                           reserved[4];
 332        /* struct btrfs_data_container  *fspath;           out */
 333        __u64                           fspath;         /* out */
 334};
 335
 336struct btrfs_ioctl_logical_ino_args {
 337        __u64                           logical;        /* in */
 338        __u64                           size;           /* in */
 339        __u64                           reserved[4];
 340        /* struct btrfs_data_container  *inodes;        out   */
 341        __u64                           inodes;
 342};
 343
 344enum btrfs_dev_stat_values {
 345        /* disk I/O failure stats */
 346        BTRFS_DEV_STAT_WRITE_ERRS, /* EIO or EREMOTEIO from lower layers */
 347        BTRFS_DEV_STAT_READ_ERRS, /* EIO or EREMOTEIO from lower layers */
 348        BTRFS_DEV_STAT_FLUSH_ERRS, /* EIO or EREMOTEIO from lower layers */
 349
 350        /* stats for indirect indications for I/O failures */
 351        BTRFS_DEV_STAT_CORRUPTION_ERRS, /* checksum error, bytenr error or
 352                                         * contents is illegal: this is an
 353                                         * indication that the block was damaged
 354                                         * during read or write, or written to
 355                                         * wrong location or read from wrong
 356                                         * location */
 357        BTRFS_DEV_STAT_GENERATION_ERRS, /* an indication that blocks have not
 358                                         * been written */
 359
 360        BTRFS_DEV_STAT_VALUES_MAX
 361};
 362
 363/* Reset statistics after reading; needs SYS_ADMIN capability */
 364#define BTRFS_DEV_STATS_RESET           (1ULL << 0)
 365
 366struct btrfs_ioctl_get_dev_stats {
 367        __u64 devid;                            /* in */
 368        __u64 nr_items;                         /* in/out */
 369        __u64 flags;                            /* in/out */
 370
 371        /* out values: */
 372        __u64 values[BTRFS_DEV_STAT_VALUES_MAX];
 373
 374        __u64 unused[128 - 2 - BTRFS_DEV_STAT_VALUES_MAX]; /* pad to 1k */
 375};
 376
 377#define BTRFS_QUOTA_CTL_ENABLE  1
 378#define BTRFS_QUOTA_CTL_DISABLE 2
 379#define BTRFS_QUOTA_CTL_RESCAN  3
 380struct btrfs_ioctl_quota_ctl_args {
 381        __u64 cmd;
 382        __u64 status;
 383};
 384
 385struct btrfs_ioctl_qgroup_assign_args {
 386        __u64 assign;
 387        __u64 src;
 388        __u64 dst;
 389};
 390
 391struct btrfs_ioctl_qgroup_create_args {
 392        __u64 create;
 393        __u64 qgroupid;
 394};
 395struct btrfs_ioctl_timespec {
 396        __u64 sec;
 397        __u32 nsec;
 398};
 399
 400struct btrfs_ioctl_received_subvol_args {
 401        char    uuid[BTRFS_UUID_SIZE];  /* in */
 402        __u64   stransid;               /* in */
 403        __u64   rtransid;               /* out */
 404        struct btrfs_ioctl_timespec stime; /* in */
 405        struct btrfs_ioctl_timespec rtime; /* out */
 406        __u64   flags;                  /* in */
 407        __u64   reserved[16];           /* in */
 408};
 409
 410/*
 411 * Caller doesn't want file data in the send stream, even if the
 412 * search of clone sources doesn't find an extent. UPDATE_EXTENT
 413 * commands will be sent instead of WRITE commands.
 414 */
 415#define BTRFS_SEND_FLAG_NO_FILE_DATA     0x1
 416
 417struct btrfs_ioctl_send_args {
 418        __s64 send_fd;                  /* in */
 419        __u64 clone_sources_count;      /* in */
 420        __u64 __user *clone_sources;    /* in */
 421        __u64 parent_root;              /* in */
 422        __u64 flags;                    /* in */
 423        __u64 reserved[4];              /* in */
 424};
 425
 426#define BTRFS_IOC_SNAP_CREATE _IOW(BTRFS_IOCTL_MAGIC, 1, \
 427                                   struct btrfs_ioctl_vol_args)
 428#define BTRFS_IOC_DEFRAG _IOW(BTRFS_IOCTL_MAGIC, 2, \
 429                                   struct btrfs_ioctl_vol_args)
 430#define BTRFS_IOC_RESIZE _IOW(BTRFS_IOCTL_MAGIC, 3, \
 431                                   struct btrfs_ioctl_vol_args)
 432#define BTRFS_IOC_SCAN_DEV _IOW(BTRFS_IOCTL_MAGIC, 4, \
 433                                   struct btrfs_ioctl_vol_args)
 434/* trans start and trans end are dangerous, and only for
 435 * use by applications that know how to avoid the
 436 * resulting deadlocks
 437 */
 438#define BTRFS_IOC_TRANS_START  _IO(BTRFS_IOCTL_MAGIC, 6)
 439#define BTRFS_IOC_TRANS_END    _IO(BTRFS_IOCTL_MAGIC, 7)
 440#define BTRFS_IOC_SYNC         _IO(BTRFS_IOCTL_MAGIC, 8)
 441
 442#define BTRFS_IOC_CLONE        _IOW(BTRFS_IOCTL_MAGIC, 9, int)
 443#define BTRFS_IOC_ADD_DEV _IOW(BTRFS_IOCTL_MAGIC, 10, \
 444                                   struct btrfs_ioctl_vol_args)
 445#define BTRFS_IOC_RM_DEV _IOW(BTRFS_IOCTL_MAGIC, 11, \
 446                                   struct btrfs_ioctl_vol_args)
 447#define BTRFS_IOC_BALANCE _IOW(BTRFS_IOCTL_MAGIC, 12, \
 448                                   struct btrfs_ioctl_vol_args)
 449
 450#define BTRFS_IOC_CLONE_RANGE _IOW(BTRFS_IOCTL_MAGIC, 13, \
 451                                  struct btrfs_ioctl_clone_range_args)
 452
 453#define BTRFS_IOC_SUBVOL_CREATE _IOW(BTRFS_IOCTL_MAGIC, 14, \
 454                                   struct btrfs_ioctl_vol_args)
 455#define BTRFS_IOC_SNAP_DESTROY _IOW(BTRFS_IOCTL_MAGIC, 15, \
 456                                struct btrfs_ioctl_vol_args)
 457#define BTRFS_IOC_DEFRAG_RANGE _IOW(BTRFS_IOCTL_MAGIC, 16, \
 458                                struct btrfs_ioctl_defrag_range_args)
 459#define BTRFS_IOC_TREE_SEARCH _IOWR(BTRFS_IOCTL_MAGIC, 17, \
 460                                   struct btrfs_ioctl_search_args)
 461#define BTRFS_IOC_INO_LOOKUP _IOWR(BTRFS_IOCTL_MAGIC, 18, \
 462                                   struct btrfs_ioctl_ino_lookup_args)
 463#define BTRFS_IOC_DEFAULT_SUBVOL _IOW(BTRFS_IOCTL_MAGIC, 19, u64)
 464#define BTRFS_IOC_SPACE_INFO _IOWR(BTRFS_IOCTL_MAGIC, 20, \
 465                                    struct btrfs_ioctl_space_args)
 466#define BTRFS_IOC_START_SYNC _IOR(BTRFS_IOCTL_MAGIC, 24, __u64)
 467#define BTRFS_IOC_WAIT_SYNC  _IOW(BTRFS_IOCTL_MAGIC, 22, __u64)
 468#define BTRFS_IOC_SNAP_CREATE_V2 _IOW(BTRFS_IOCTL_MAGIC, 23, \
 469                                   struct btrfs_ioctl_vol_args_v2)
 470#define BTRFS_IOC_SUBVOL_CREATE_V2 _IOW(BTRFS_IOCTL_MAGIC, 24, \
 471                                   struct btrfs_ioctl_vol_args_v2)
 472#define BTRFS_IOC_SUBVOL_GETFLAGS _IOR(BTRFS_IOCTL_MAGIC, 25, __u64)
 473#define BTRFS_IOC_SUBVOL_SETFLAGS _IOW(BTRFS_IOCTL_MAGIC, 26, __u64)
 474#define BTRFS_IOC_SCRUB _IOWR(BTRFS_IOCTL_MAGIC, 27, \
 475                              struct btrfs_ioctl_scrub_args)
 476#define BTRFS_IOC_SCRUB_CANCEL _IO(BTRFS_IOCTL_MAGIC, 28)
 477#define BTRFS_IOC_SCRUB_PROGRESS _IOWR(BTRFS_IOCTL_MAGIC, 29, \
 478                                       struct btrfs_ioctl_scrub_args)
 479#define BTRFS_IOC_DEV_INFO _IOWR(BTRFS_IOCTL_MAGIC, 30, \
 480                                 struct btrfs_ioctl_dev_info_args)
 481#define BTRFS_IOC_FS_INFO _IOR(BTRFS_IOCTL_MAGIC, 31, \
 482                               struct btrfs_ioctl_fs_info_args)
 483#define BTRFS_IOC_BALANCE_V2 _IOWR(BTRFS_IOCTL_MAGIC, 32, \
 484                                   struct btrfs_ioctl_balance_args)
 485#define BTRFS_IOC_BALANCE_CTL _IOW(BTRFS_IOCTL_MAGIC, 33, int)
 486#define BTRFS_IOC_BALANCE_PROGRESS _IOR(BTRFS_IOCTL_MAGIC, 34, \
 487                                        struct btrfs_ioctl_balance_args)
 488#define BTRFS_IOC_INO_PATHS _IOWR(BTRFS_IOCTL_MAGIC, 35, \
 489                                        struct btrfs_ioctl_ino_path_args)
 490#define BTRFS_IOC_LOGICAL_INO _IOWR(BTRFS_IOCTL_MAGIC, 36, \
 491                                        struct btrfs_ioctl_ino_path_args)
 492#define BTRFS_IOC_SET_RECEIVED_SUBVOL _IOWR(BTRFS_IOCTL_MAGIC, 37, \
 493                                struct btrfs_ioctl_received_subvol_args)
 494#define BTRFS_IOC_SEND _IOW(BTRFS_IOCTL_MAGIC, 38, struct btrfs_ioctl_send_args)
 495#define BTRFS_IOC_DEVICES_READY _IOR(BTRFS_IOCTL_MAGIC, 39, \
 496                                     struct btrfs_ioctl_vol_args)
 497#define BTRFS_IOC_QUOTA_CTL _IOWR(BTRFS_IOCTL_MAGIC, 40, \
 498                               struct btrfs_ioctl_quota_ctl_args)
 499#define BTRFS_IOC_QGROUP_ASSIGN _IOW(BTRFS_IOCTL_MAGIC, 41, \
 500                               struct btrfs_ioctl_qgroup_assign_args)
 501#define BTRFS_IOC_QGROUP_CREATE _IOW(BTRFS_IOCTL_MAGIC, 42, \
 502                               struct btrfs_ioctl_qgroup_create_args)
 503#define BTRFS_IOC_QGROUP_LIMIT _IOR(BTRFS_IOCTL_MAGIC, 43, \
 504                               struct btrfs_ioctl_qgroup_limit_args)
 505#define BTRFS_IOC_GET_FSLABEL _IOR(BTRFS_IOCTL_MAGIC, 49, \
 506                                   char[BTRFS_LABEL_SIZE])
 507#define BTRFS_IOC_SET_FSLABEL _IOW(BTRFS_IOCTL_MAGIC, 50, \
 508                                   char[BTRFS_LABEL_SIZE])
 509#define BTRFS_IOC_GET_DEV_STATS _IOWR(BTRFS_IOCTL_MAGIC, 52, \
 510                                      struct btrfs_ioctl_get_dev_stats)
 511#define BTRFS_IOC_DEV_REPLACE _IOWR(BTRFS_IOCTL_MAGIC, 53, \
 512                                    struct btrfs_ioctl_dev_replace_args)
 513
 514#endif /* _UAPI_LINUX_BTRFS_H */
 515