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_FSID_SIZE 16
  36 #define BTRFS_UUID_SIZE 16
  37
  38 #define BTRFS_SUBVOL_NAME_MAX 4039
  39 struct btrfs_ioctl_vol_args_v2 {
  40         __s64 fd;
  41         __u64 transid;
  42         __u64 flags;
  43         __u64 unused[4];
  44         char name[BTRFS_SUBVOL_NAME_MAX + 1];
  45 };
  46
  47 /*
  48  * structure to report errors and progress to userspace, either as a
  49  * result of a finished scrub, a canceled scrub or a progress inquiry
  50  */
  51 struct btrfs_scrub_progress {
  52         __u64 data_extents_scrubbed;    /* # of data extents scrubbed */
  53         __u64 tree_extents_scrubbed;    /* # of tree extents scrubbed */
  54         __u64 data_bytes_scrubbed;      /* # of data bytes scrubbed */
  55         __u64 tree_bytes_scrubbed;      /* # of tree bytes scrubbed */
  56         __u64 read_errors;              /* # of read errors encountered (EIO) */
  57         __u64 csum_errors;              /* # of failed csum checks */
  58         __u64 verify_errors;            /* # of occurences, where the metadata
  59                                          * of a tree block did not match the
  60                                          * expected values, like generation or
  61                                          * logical */
  62         __u64 no_csum;                  /* # of 4k data block for which no csum
  63                                          * is present, probably the result of
  64                                          * data written with nodatasum */
  65         __u64 csum_discards;            /* # of csum for which no data was found
  66                                          * in the extent tree. */
  67         __u64 super_errors;             /* # of bad super blocks encountered */
  68         __u64 malloc_errors;            /* # of internal kmalloc errors. These
  69                                          * will likely cause an incomplete
  70                                          * scrub */
  71         __u64 uncorrectable_errors;     /* # of errors where either no intact
  72                                          * copy was found or the writeback
  73                                          * failed */
  74         __u64 corrected_errors;         /* # of errors corrected */
  75         __u64 last_physical;            /* last physical address scrubbed. In
  76                                          * case a scrub was aborted, this can
  77                                          * be used to restart the scrub */
  78         __u64 unverified_errors;        /* # of occurences where a read for a
  79                                          * full (64k) bio failed, but the re-
  80                                          * check succeeded for each 4k piece.
  81                                          * Intermittent error. */
  82 };
  83
  84 #define BTRFS_SCRUB_READONLY    1
  85 struct btrfs_ioctl_scrub_args {
  86         __u64 devid;                            /* in */
  87         __u64 start;                            /* in */
  88         __u64 end;                              /* in */
  89         __u64 flags;                            /* in */
  90         struct btrfs_scrub_progress progress;   /* out */
  91         /* pad to 1k */
  92         __u64 unused[(1024-32-sizeof(struct btrfs_scrub_progress))/8];
  93 };
  94
  95 #define BTRFS_DEVICE_PATH_NAME_MAX 1024
  96 struct btrfs_ioctl_dev_info_args {
  97         __u64 devid;                            /* in/out */
  98         __u8 uuid[BTRFS_UUID_SIZE];             /* in/out */
  99         __u64 bytes_used;                       /* out */
 100         __u64 total_bytes;                      /* out */
 101         __u64 unused[379];                      /* pad to 4k */
 102         __u8 path[BTRFS_DEVICE_PATH_NAME_MAX];  /* out */
 103 };
 104
 105 struct btrfs_ioctl_fs_info_args {
 106         __u64 max_id;                           /* out */
 107         __u64 num_devices;                      /* out */
 108         __u8 fsid[BTRFS_FSID_SIZE];             /* out */
 109         __u64 reserved[124];                    /* pad to 1k */
 110 };
 111
 112 #define BTRFS_INO_LOOKUP_PATH_MAX 4080
 113 struct btrfs_ioctl_ino_lookup_args {
 114         __u64 treeid;
 115         __u64 objectid;
 116         char name[BTRFS_INO_LOOKUP_PATH_MAX];
 117 };
 118
 119 struct btrfs_ioctl_search_key {
 120         /* which root are we searching.  0 is the tree of tree roots */
 121         __u64 tree_id;
 122
 123         /* keys returned will be >= min and <= max */
 124         __u64 min_objectid;
 125         __u64 max_objectid;
 126
 127         /* keys returned will be >= min and <= max */
 128         __u64 min_offset;
 129         __u64 max_offset;
 130
 131         /* max and min transids to search for */
 132         __u64 min_transid;
 133         __u64 max_transid;
 134
 135         /* keys returned will be >= min and <= max */
 136         __u32 min_type;
 137         __u32 max_type;
 138
 139         /*
 140          * how many items did userland ask for, and how many are we
 141          * returning
 142          */
 143         __u32 nr_items;
 144
 145         /* align to 64 bits */
 146         __u32 unused;
 147
 148         /* some extra for later */
 149         __u64 unused1;
 150         __u64 unused2;
 151         __u64 unused3;
 152         __u64 unused4;
 153 };
 154
 155 struct btrfs_ioctl_search_header {
 156         __u64 transid;
 157         __u64 objectid;
 158         __u64 offset;
 159         __u32 type;
 160         __u32 len;
 161 };
 162
 163 #define BTRFS_SEARCH_ARGS_BUFSIZE (4096 - sizeof(struct btrfs_ioctl_search_key))
 164 /*
 165  * the buf is an array of search headers where
 166  * each header is followed by the actual item
 167  * the type field is expanded to 32 bits for alignment
 168  */
 169 struct btrfs_ioctl_search_args {
 170         struct btrfs_ioctl_search_key key;
 171         char buf[BTRFS_SEARCH_ARGS_BUFSIZE];
 172 };
 173
 174 struct btrfs_ioctl_clone_range_args {
 175   __s64 src_fd;
 176   __u64 src_offset, src_length;
 177   __u64 dest_offset;
 178 };
 179
 180 /* flags for the defrag range ioctl */
 181 #define BTRFS_DEFRAG_RANGE_COMPRESS 1
 182 #define BTRFS_DEFRAG_RANGE_START_IO 2
 183
 184 struct btrfs_ioctl_space_info {
 185         __u64 flags;
 186         __u64 total_bytes;
 187         __u64 used_bytes;
 188 };
 189
 190 struct btrfs_ioctl_space_args {
 191         __u64 space_slots;
 192         __u64 total_spaces;
 193         struct btrfs_ioctl_space_info spaces[0];
 194 };
 195
 196 #define BTRFS_IOC_SNAP_CREATE _IOW(BTRFS_IOCTL_MAGIC, 1, \
 197                                    struct btrfs_ioctl_vol_args)
 198 #define BTRFS_IOC_DEFRAG _IOW(BTRFS_IOCTL_MAGIC, 2, \
 199                                    struct btrfs_ioctl_vol_args)
 200 #define BTRFS_IOC_RESIZE _IOW(BTRFS_IOCTL_MAGIC, 3, \
 201                                    struct btrfs_ioctl_vol_args)
 202 #define BTRFS_IOC_SCAN_DEV _IOW(BTRFS_IOCTL_MAGIC, 4, \
 203                                    struct btrfs_ioctl_vol_args)
 204 /* trans start and trans end are dangerous, and only for
 205  * use by applications that know how to avoid the
 206  * resulting deadlocks
 207  */
 208 #define BTRFS_IOC_TRANS_START  _IO(BTRFS_IOCTL_MAGIC, 6)
 209 #define BTRFS_IOC_TRANS_END    _IO(BTRFS_IOCTL_MAGIC, 7)
 210 #define BTRFS_IOC_SYNC         _IO(BTRFS_IOCTL_MAGIC, 8)
 211
 212 #define BTRFS_IOC_CLONE        _IOW(BTRFS_IOCTL_MAGIC, 9, int)
 213 #define BTRFS_IOC_ADD_DEV _IOW(BTRFS_IOCTL_MAGIC, 10, \
 214                                    struct btrfs_ioctl_vol_args)
 215 #define BTRFS_IOC_RM_DEV _IOW(BTRFS_IOCTL_MAGIC, 11, \
 216                                    struct btrfs_ioctl_vol_args)
 217 #define BTRFS_IOC_BALANCE _IOW(BTRFS_IOCTL_MAGIC, 12, \
 218                                    struct btrfs_ioctl_vol_args)
 219
 220 #define BTRFS_IOC_CLONE_RANGE _IOW(BTRFS_IOCTL_MAGIC, 13, \
 221                                   struct btrfs_ioctl_clone_range_args)
 222
 223 #define BTRFS_IOC_SUBVOL_CREATE _IOW(BTRFS_IOCTL_MAGIC, 14, \
 224                                    struct btrfs_ioctl_vol_args)
 225 #define BTRFS_IOC_SNAP_DESTROY _IOW(BTRFS_IOCTL_MAGIC, 15, \
 226                                 struct btrfs_ioctl_vol_args)
 227 #define BTRFS_IOC_DEFRAG_RANGE _IOW(BTRFS_IOCTL_MAGIC, 16, \
 228                                 struct btrfs_ioctl_defrag_range_args)
 229 #define BTRFS_IOC_TREE_SEARCH _IOWR(BTRFS_IOCTL_MAGIC, 17, \
 230                                    struct btrfs_ioctl_search_args)
 231 #define BTRFS_IOC_INO_LOOKUP _IOWR(BTRFS_IOCTL_MAGIC, 18, \
 232                                    struct btrfs_ioctl_ino_lookup_args)
 233 #define BTRFS_IOC_DEFAULT_SUBVOL _IOW(BTRFS_IOCTL_MAGIC, 19, u64)
 234 #define BTRFS_IOC_SPACE_INFO _IOWR(BTRFS_IOCTL_MAGIC, 20, \
 235                                     struct btrfs_ioctl_space_args)
 236 #define BTRFS_IOC_START_SYNC _IOR(BTRFS_IOCTL_MAGIC, 24, __u64)
 237 #define BTRFS_IOC_WAIT_SYNC  _IOW(BTRFS_IOCTL_MAGIC, 22, __u64)
 238 #define BTRFS_IOC_SNAP_CREATE_V2 _IOW(BTRFS_IOCTL_MAGIC, 23, \
 239                                    struct btrfs_ioctl_vol_args_v2)
 240 #define BTRFS_IOC_SUBVOL_GETFLAGS _IOW(BTRFS_IOCTL_MAGIC, 25, __u64)
 241 #define BTRFS_IOC_SUBVOL_SETFLAGS _IOW(BTRFS_IOCTL_MAGIC, 26, __u64)
 242 #define BTRFS_IOC_SCRUB _IOWR(BTRFS_IOCTL_MAGIC, 27, \
 243                               struct btrfs_ioctl_scrub_args)
 244 #define BTRFS_IOC_SCRUB_CANCEL _IO(BTRFS_IOCTL_MAGIC, 28)
 245 #define BTRFS_IOC_SCRUB_PROGRESS _IOWR(BTRFS_IOCTL_MAGIC, 29, \
 246                                        struct btrfs_ioctl_scrub_args)
 247 #define BTRFS_IOC_DEV_INFO _IOWR(BTRFS_IOCTL_MAGIC, 30, \
 248                                  struct btrfs_ioctl_dev_info_args)
 249 #define BTRFS_IOC_FS_INFO _IOR(BTRFS_IOCTL_MAGIC, 31, \
 250                                struct btrfs_ioctl_fs_info_args)
 251 #endif