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_DEVICE_PATH_NAME_MAX 1024
 127 struct btrfs_ioctl_dev_info_args {
 128         __u64 devid;                            /* in/out */
 129         __u8 uuid[BTRFS_UUID_SIZE];             /* in/out */
 130         __u64 bytes_used;                       /* out */
 131         __u64 total_bytes;                      /* out */
 132         __u64 unused[379];                      /* pad to 4k */
 133         __u8 path[BTRFS_DEVICE_PATH_NAME_MAX];  /* out */
 134 };
 135
 136 struct btrfs_ioctl_fs_info_args {
 137         __u64 max_id;                           /* out */
 138         __u64 num_devices;                      /* out */
 139         __u8 fsid[BTRFS_FSID_SIZE];             /* out */
 140         __u64 reserved[124];                    /* pad to 1k */
 141 };
 142
 143 /* balance control ioctl modes */
 144 #define BTRFS_BALANCE_CTL_PAUSE         1
 145 #define BTRFS_BALANCE_CTL_CANCEL        2
 146
 147 /*
 148  * this is packed, because it should be exactly the same as its disk
 149  * byte order counterpart (struct btrfs_disk_balance_args)
 150  */
 151 struct btrfs_balance_args {
 152         __u64 profiles;
 153         __u64 usage;
 154         __u64 devid;
 155         __u64 pstart;
 156         __u64 pend;
 157         __u64 vstart;
 158         __u64 vend;
 159
 160         __u64 target;
 161
 162         __u64 flags;
 163
 164         __u64 unused[8];
 165 } __attribute__ ((__packed__));
 166
 167 /* report balance progress to userspace */
 168 struct btrfs_balance_progress {
 169         __u64 expected;         /* estimated # of chunks that will be
 170                                  * relocated to fulfill the request */
 171         __u64 considered;       /* # of chunks we have considered so far */
 172         __u64 completed;        /* # of chunks relocated so far */
 173 };
 174
 175 #define BTRFS_BALANCE_STATE_RUNNING     (1ULL << 0)
 176 #define BTRFS_BALANCE_STATE_PAUSE_REQ   (1ULL << 1)
 177 #define BTRFS_BALANCE_STATE_CANCEL_REQ  (1ULL << 2)
 178
 179 struct btrfs_ioctl_balance_args {
 180         __u64 flags;                            /* in/out */
 181         __u64 state;                            /* out */
 182
 183         struct btrfs_balance_args data;         /* in/out */
 184         struct btrfs_balance_args meta;         /* in/out */
 185         struct btrfs_balance_args sys;          /* in/out */
 186
 187         struct btrfs_balance_progress stat;     /* out */
 188
 189         __u64 unused[72];                       /* pad to 1k */
 190 };
 191
 192 #define BTRFS_INO_LOOKUP_PATH_MAX 4080
 193 struct btrfs_ioctl_ino_lookup_args {
 194         __u64 treeid;
 195         __u64 objectid;
 196         char name[BTRFS_INO_LOOKUP_PATH_MAX];
 197 };
 198
 199 struct btrfs_ioctl_search_key {
 200         /* which root are we searching.  0 is the tree of tree roots */
 201         __u64 tree_id;
 202
 203         /* keys returned will be >= min and <= max */
 204         __u64 min_objectid;
 205         __u64 max_objectid;
 206
 207         /* keys returned will be >= min and <= max */
 208         __u64 min_offset;
 209         __u64 max_offset;
 210
 211         /* max and min transids to search for */
 212         __u64 min_transid;
 213         __u64 max_transid;
 214
 215         /* keys returned will be >= min and <= max */
 216         __u32 min_type;
 217         __u32 max_type;
 218
 219         /*
 220          * how many items did userland ask for, and how many are we
 221          * returning
 222          */
 223         __u32 nr_items;
 224
 225         /* align to 64 bits */
 226         __u32 unused;
 227
 228         /* some extra for later */
 229         __u64 unused1;
 230         __u64 unused2;
 231         __u64 unused3;
 232         __u64 unused4;
 233 };
 234
 235 struct btrfs_ioctl_search_header {
 236         __u64 transid;
 237         __u64 objectid;
 238         __u64 offset;
 239         __u32 type;
 240         __u32 len;
 241 };
 242
 243 #define BTRFS_SEARCH_ARGS_BUFSIZE (4096 - sizeof(struct btrfs_ioctl_search_key))
 244 /*
 245  * the buf is an array of search headers where
 246  * each header is followed by the actual item
 247  * the type field is expanded to 32 bits for alignment
 248  */
 249 struct btrfs_ioctl_search_args {
 250         struct btrfs_ioctl_search_key key;
 251         char buf[BTRFS_SEARCH_ARGS_BUFSIZE];
 252 };
 253
 254 struct btrfs_ioctl_clone_range_args {
 255   __s64 src_fd;
 256   __u64 src_offset, src_length;
 257   __u64 dest_offset;
 258 };
 259
 260 /* flags for the defrag range ioctl */
 261 #define BTRFS_DEFRAG_RANGE_COMPRESS 1
 262 #define BTRFS_DEFRAG_RANGE_START_IO 2
 263
 264 struct btrfs_ioctl_space_info {
 265         __u64 flags;
 266         __u64 total_bytes;
 267         __u64 used_bytes;
 268 };
 269
 270 struct btrfs_ioctl_space_args {
 271         __u64 space_slots;
 272         __u64 total_spaces;
 273         struct btrfs_ioctl_space_info spaces[0];
 274 };
 275
 276 struct btrfs_data_container {
 277         __u32   bytes_left;     /* out -- bytes not needed to deliver output */
 278         __u32   bytes_missing;  /* out -- additional bytes needed for result */
 279         __u32   elem_cnt;       /* out */
 280         __u32   elem_missed;    /* out */
 281         __u64   val[0];         /* out */
 282 };
 283
 284 struct btrfs_ioctl_ino_path_args {
 285         __u64                           inum;           /* in */
 286         __u64                           size;           /* in */
 287         __u64                           reserved[4];
 288         /* struct btrfs_data_container  *fspath;           out */
 289         __u64                           fspath;         /* out */
 290 };
 291
 292 struct btrfs_ioctl_logical_ino_args {
 293         __u64                           logical;        /* in */
 294         __u64                           size;           /* in */
 295         __u64                           reserved[4];
 296         /* struct btrfs_data_container  *inodes;        out   */
 297         __u64                           inodes;
 298 };
 299
 300 enum btrfs_dev_stat_values {
 301         /* disk I/O failure stats */
 302         BTRFS_DEV_STAT_WRITE_ERRS, /* EIO or EREMOTEIO from lower layers */
 303         BTRFS_DEV_STAT_READ_ERRS, /* EIO or EREMOTEIO from lower layers */
 304         BTRFS_DEV_STAT_FLUSH_ERRS, /* EIO or EREMOTEIO from lower layers */
 305
 306         /* stats for indirect indications for I/O failures */
 307         BTRFS_DEV_STAT_CORRUPTION_ERRS, /* checksum error, bytenr error or
 308                                          * contents is illegal: this is an
 309                                          * indication that the block was damaged
 310                                          * during read or write, or written to
 311                                          * wrong location or read from wrong
 312                                          * location */
 313         BTRFS_DEV_STAT_GENERATION_ERRS, /* an indication that blocks have not
 314                                          * been written */
 315
 316         BTRFS_DEV_STAT_VALUES_MAX
 317 };
 318
 319 /* Reset statistics after reading; needs SYS_ADMIN capability */
 320 #define BTRFS_DEV_STATS_RESET           (1ULL << 0)
 321
 322 struct btrfs_ioctl_get_dev_stats {
 323         __u64 devid;                            /* in */
 324         __u64 nr_items;                         /* in/out */
 325         __u64 flags;                            /* in/out */
 326
 327         /* out values: */
 328         __u64 values[BTRFS_DEV_STAT_VALUES_MAX];
 329
 330         __u64 unused[128 - 2 - BTRFS_DEV_STAT_VALUES_MAX]; /* pad to 1k */
 331 };
 332
 333 #define BTRFS_QUOTA_CTL_ENABLE  1
 334 #define BTRFS_QUOTA_CTL_DISABLE 2
 335 #define BTRFS_QUOTA_CTL_RESCAN  3
 336 struct btrfs_ioctl_quota_ctl_args {
 337         __u64 cmd;
 338         __u64 status;
 339 };
 340
 341 struct btrfs_ioctl_qgroup_assign_args {
 342         __u64 assign;
 343         __u64 src;
 344         __u64 dst;
 345 };
 346
 347 struct btrfs_ioctl_qgroup_create_args {
 348         __u64 create;
 349         __u64 qgroupid;
 350 };
 351
 352 #define BTRFS_IOC_SNAP_CREATE _IOW(BTRFS_IOCTL_MAGIC, 1, \
 353                                    struct btrfs_ioctl_vol_args)
 354 #define BTRFS_IOC_DEFRAG _IOW(BTRFS_IOCTL_MAGIC, 2, \
 355                                    struct btrfs_ioctl_vol_args)
 356 #define BTRFS_IOC_RESIZE _IOW(BTRFS_IOCTL_MAGIC, 3, \
 357                                    struct btrfs_ioctl_vol_args)
 358 #define BTRFS_IOC_SCAN_DEV _IOW(BTRFS_IOCTL_MAGIC, 4, \
 359                                    struct btrfs_ioctl_vol_args)
 360 /* trans start and trans end are dangerous, and only for
 361  * use by applications that know how to avoid the
 362  * resulting deadlocks
 363  */
 364 #define BTRFS_IOC_TRANS_START  _IO(BTRFS_IOCTL_MAGIC, 6)
 365 #define BTRFS_IOC_TRANS_END    _IO(BTRFS_IOCTL_MAGIC, 7)
 366 #define BTRFS_IOC_SYNC         _IO(BTRFS_IOCTL_MAGIC, 8)
 367
 368 #define BTRFS_IOC_CLONE        _IOW(BTRFS_IOCTL_MAGIC, 9, int)
 369 #define BTRFS_IOC_ADD_DEV _IOW(BTRFS_IOCTL_MAGIC, 10, \
 370                                    struct btrfs_ioctl_vol_args)
 371 #define BTRFS_IOC_RM_DEV _IOW(BTRFS_IOCTL_MAGIC, 11, \
 372                                    struct btrfs_ioctl_vol_args)
 373 #define BTRFS_IOC_BALANCE _IOW(BTRFS_IOCTL_MAGIC, 12, \
 374                                    struct btrfs_ioctl_vol_args)
 375
 376 #define BTRFS_IOC_CLONE_RANGE _IOW(BTRFS_IOCTL_MAGIC, 13, \
 377                                   struct btrfs_ioctl_clone_range_args)
 378
 379 #define BTRFS_IOC_SUBVOL_CREATE _IOW(BTRFS_IOCTL_MAGIC, 14, \
 380                                    struct btrfs_ioctl_vol_args)
 381 #define BTRFS_IOC_SNAP_DESTROY _IOW(BTRFS_IOCTL_MAGIC, 15, \
 382                                 struct btrfs_ioctl_vol_args)
 383 #define BTRFS_IOC_DEFRAG_RANGE _IOW(BTRFS_IOCTL_MAGIC, 16, \
 384                                 struct btrfs_ioctl_defrag_range_args)
 385 #define BTRFS_IOC_TREE_SEARCH _IOWR(BTRFS_IOCTL_MAGIC, 17, \
 386                                    struct btrfs_ioctl_search_args)
 387 #define BTRFS_IOC_INO_LOOKUP _IOWR(BTRFS_IOCTL_MAGIC, 18, \
 388                                    struct btrfs_ioctl_ino_lookup_args)
 389 #define BTRFS_IOC_DEFAULT_SUBVOL _IOW(BTRFS_IOCTL_MAGIC, 19, u64)
 390 #define BTRFS_IOC_SPACE_INFO _IOWR(BTRFS_IOCTL_MAGIC, 20, \
 391                                     struct btrfs_ioctl_space_args)
 392 #define BTRFS_IOC_START_SYNC _IOR(BTRFS_IOCTL_MAGIC, 24, __u64)
 393 #define BTRFS_IOC_WAIT_SYNC  _IOW(BTRFS_IOCTL_MAGIC, 22, __u64)
 394 #define BTRFS_IOC_SNAP_CREATE_V2 _IOW(BTRFS_IOCTL_MAGIC, 23, \
 395                                    struct btrfs_ioctl_vol_args_v2)
 396 #define BTRFS_IOC_SUBVOL_CREATE_V2 _IOW(BTRFS_IOCTL_MAGIC, 24, \
 397                                    struct btrfs_ioctl_vol_args_v2)
 398 #define BTRFS_IOC_SUBVOL_GETFLAGS _IOR(BTRFS_IOCTL_MAGIC, 25, __u64)
 399 #define BTRFS_IOC_SUBVOL_SETFLAGS _IOW(BTRFS_IOCTL_MAGIC, 26, __u64)
 400 #define BTRFS_IOC_SCRUB _IOWR(BTRFS_IOCTL_MAGIC, 27, \
 401                               struct btrfs_ioctl_scrub_args)
 402 #define BTRFS_IOC_SCRUB_CANCEL _IO(BTRFS_IOCTL_MAGIC, 28)
 403 #define BTRFS_IOC_SCRUB_PROGRESS _IOWR(BTRFS_IOCTL_MAGIC, 29, \
 404                                        struct btrfs_ioctl_scrub_args)
 405 #define BTRFS_IOC_DEV_INFO _IOWR(BTRFS_IOCTL_MAGIC, 30, \
 406                                  struct btrfs_ioctl_dev_info_args)
 407 #define BTRFS_IOC_FS_INFO _IOR(BTRFS_IOCTL_MAGIC, 31, \
 408                                struct btrfs_ioctl_fs_info_args)
 409 #define BTRFS_IOC_BALANCE_V2 _IOWR(BTRFS_IOCTL_MAGIC, 32, \
 410                                    struct btrfs_ioctl_balance_args)
 411 #define BTRFS_IOC_BALANCE_CTL _IOW(BTRFS_IOCTL_MAGIC, 33, int)
 412 #define BTRFS_IOC_BALANCE_PROGRESS _IOR(BTRFS_IOCTL_MAGIC, 34, \
 413                                         struct btrfs_ioctl_balance_args)
 414 #define BTRFS_IOC_INO_PATHS _IOWR(BTRFS_IOCTL_MAGIC, 35, \
 415                                         struct btrfs_ioctl_ino_path_args)
 416 #define BTRFS_IOC_LOGICAL_INO _IOWR(BTRFS_IOCTL_MAGIC, 36, \
 417                                         struct btrfs_ioctl_ino_path_args)
 418 #define BTRFS_IOC_DEVICES_READY _IOR(BTRFS_IOCTL_MAGIC, 39, \
 419                                      struct btrfs_ioctl_vol_args)
 420 #define BTRFS_IOC_QUOTA_CTL _IOWR(BTRFS_IOCTL_MAGIC, 40, \
 421                                struct btrfs_ioctl_quota_ctl_args)
 422 #define BTRFS_IOC_QGROUP_ASSIGN _IOW(BTRFS_IOCTL_MAGIC, 41, \
 423                                struct btrfs_ioctl_qgroup_assign_args)
 424 #define BTRFS_IOC_QGROUP_CREATE _IOW(BTRFS_IOCTL_MAGIC, 42, \
 425                                struct btrfs_ioctl_qgroup_create_args)
 426 #define BTRFS_IOC_QGROUP_LIMIT _IOR(BTRFS_IOCTL_MAGIC, 43, \
 427                                struct btrfs_ioctl_qgroup_limit_args)
 428 #define BTRFS_IOC_GET_DEV_STATS _IOWR(BTRFS_IOCTL_MAGIC, 52, \
 429                                       struct btrfs_ioctl_get_dev_stats)
 430 #endif