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