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