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
  36 #define BTRFS_SUBVOL_NAME_MAX 4039
  37 struct btrfs_ioctl_vol_args_v2 {
  38         __s64 fd;
  39         __u64 transid;
  40         __u64 flags;
  41         __u64 unused[4];
  42         char name[BTRFS_SUBVOL_NAME_MAX + 1];
  43 };
  44
  45 #define BTRFS_INO_LOOKUP_PATH_MAX 4080
  46 struct btrfs_ioctl_ino_lookup_args {
  47         __u64 treeid;
  48         __u64 objectid;
  49         char name[BTRFS_INO_LOOKUP_PATH_MAX];
  50 };
  51
  52 struct btrfs_ioctl_search_key {
  53         /* which root are we searching.  0 is the tree of tree roots */
  54         __u64 tree_id;
  55
  56         /* keys returned will be >= min and <= max */
  57         __u64 min_objectid;
  58         __u64 max_objectid;
  59
  60         /* keys returned will be >= min and <= max */
  61         __u64 min_offset;
  62         __u64 max_offset;
  63
  64         /* max and min transids to search for */
  65         __u64 min_transid;
  66         __u64 max_transid;
  67
  68         /* keys returned will be >= min and <= max */
  69         __u32 min_type;
  70         __u32 max_type;
  71
  72         /*
  73          * how many items did userland ask for, and how many are we
  74          * returning
  75          */
  76         __u32 nr_items;
  77
  78         /* align to 64 bits */
  79         __u32 unused;
  80
  81         /* some extra for later */
  82         __u64 unused1;
  83         __u64 unused2;
  84         __u64 unused3;
  85         __u64 unused4;
  86 };
  87
  88 struct btrfs_ioctl_search_header {
  89         __u64 transid;
  90         __u64 objectid;
  91         __u64 offset;
  92         __u32 type;
  93         __u32 len;
  94 };
  95
  96 #define BTRFS_SEARCH_ARGS_BUFSIZE (4096 - sizeof(struct btrfs_ioctl_search_key))
  97 /*
  98  * the buf is an array of search headers where
  99  * each header is followed by the actual item
 100  * the type field is expanded to 32 bits for alignment
 101  */
 102 struct btrfs_ioctl_search_args {
 103         struct btrfs_ioctl_search_key key;
 104         char buf[BTRFS_SEARCH_ARGS_BUFSIZE];
 105 };
 106
 107 struct btrfs_ioctl_clone_range_args {
 108   __s64 src_fd;
 109   __u64 src_offset, src_length;
 110   __u64 dest_offset;
 111 };
 112
 113 /* flags for the defrag range ioctl */
 114 #define BTRFS_DEFRAG_RANGE_COMPRESS 1
 115 #define BTRFS_DEFRAG_RANGE_START_IO 2
 116
 117 struct btrfs_ioctl_defrag_range_args {
 118         /* start of the defrag operation */
 119         __u64 start;
 120
 121         /* number of bytes to defrag, use (u64)-1 to say all */
 122         __u64 len;
 123
 124         /*
 125          * flags for the operation, which can include turning
 126          * on compression for this one defrag
 127          */
 128         __u64 flags;
 129
 130         /*
 131          * any extent bigger than this will be considered
 132          * already defragged.  Use 0 to take the kernel default
 133          * Use 1 to say every single extent must be rewritten
 134          */
 135         __u32 extent_thresh;
 136
 137         /*
 138          * which compression method to use if turning on compression
 139          * for this defrag operation.  If unspecified, zlib will
 140          * be used
 141          */
 142         __u32 compress_type;
 143
 144         /* spare for later */
 145         __u32 unused[4];
 146 };
 147
 148 struct btrfs_ioctl_space_info {
 149         __u64 flags;
 150         __u64 total_bytes;
 151         __u64 used_bytes;
 152 };
 153
 154 struct btrfs_ioctl_space_args {
 155         __u64 space_slots;
 156         __u64 total_spaces;
 157         struct btrfs_ioctl_space_info spaces[0];
 158 };
 159
 160 #define BTRFS_IOC_SNAP_CREATE _IOW(BTRFS_IOCTL_MAGIC, 1, \
 161                                    struct btrfs_ioctl_vol_args)
 162 #define BTRFS_IOC_DEFRAG _IOW(BTRFS_IOCTL_MAGIC, 2, \
 163                                    struct btrfs_ioctl_vol_args)
 164 #define BTRFS_IOC_RESIZE _IOW(BTRFS_IOCTL_MAGIC, 3, \
 165                                    struct btrfs_ioctl_vol_args)
 166 #define BTRFS_IOC_SCAN_DEV _IOW(BTRFS_IOCTL_MAGIC, 4, \
 167                                    struct btrfs_ioctl_vol_args)
 168 /* trans start and trans end are dangerous, and only for
 169  * use by applications that know how to avoid the
 170  * resulting deadlocks
 171  */
 172 #define BTRFS_IOC_TRANS_START  _IO(BTRFS_IOCTL_MAGIC, 6)
 173 #define BTRFS_IOC_TRANS_END    _IO(BTRFS_IOCTL_MAGIC, 7)
 174 #define BTRFS_IOC_SYNC         _IO(BTRFS_IOCTL_MAGIC, 8)
 175
 176 #define BTRFS_IOC_CLONE        _IOW(BTRFS_IOCTL_MAGIC, 9, int)
 177 #define BTRFS_IOC_ADD_DEV _IOW(BTRFS_IOCTL_MAGIC, 10, \
 178                                    struct btrfs_ioctl_vol_args)
 179 #define BTRFS_IOC_RM_DEV _IOW(BTRFS_IOCTL_MAGIC, 11, \
 180                                    struct btrfs_ioctl_vol_args)
 181 #define BTRFS_IOC_BALANCE _IOW(BTRFS_IOCTL_MAGIC, 12, \
 182                                    struct btrfs_ioctl_vol_args)
 183
 184 #define BTRFS_IOC_CLONE_RANGE _IOW(BTRFS_IOCTL_MAGIC, 13, \
 185                                   struct btrfs_ioctl_clone_range_args)
 186
 187 #define BTRFS_IOC_SUBVOL_CREATE _IOW(BTRFS_IOCTL_MAGIC, 14, \
 188                                    struct btrfs_ioctl_vol_args)
 189 #define BTRFS_IOC_SNAP_DESTROY _IOW(BTRFS_IOCTL_MAGIC, 15, \
 190                                 struct btrfs_ioctl_vol_args)
 191 #define BTRFS_IOC_DEFRAG_RANGE _IOW(BTRFS_IOCTL_MAGIC, 16, \
 192                                 struct btrfs_ioctl_defrag_range_args)
 193 #define BTRFS_IOC_TREE_SEARCH _IOWR(BTRFS_IOCTL_MAGIC, 17, \
 194                                    struct btrfs_ioctl_search_args)
 195 #define BTRFS_IOC_INO_LOOKUP _IOWR(BTRFS_IOCTL_MAGIC, 18, \
 196                                    struct btrfs_ioctl_ino_lookup_args)
 197 #define BTRFS_IOC_DEFAULT_SUBVOL _IOW(BTRFS_IOCTL_MAGIC, 19, u64)
 198 #define BTRFS_IOC_SPACE_INFO _IOWR(BTRFS_IOCTL_MAGIC, 20, \
 199                                     struct btrfs_ioctl_space_args)
 200 #define BTRFS_IOC_START_SYNC _IOR(BTRFS_IOCTL_MAGIC, 24, __u64)
 201 #define BTRFS_IOC_WAIT_SYNC  _IOW(BTRFS_IOCTL_MAGIC, 22, __u64)
 202 #define BTRFS_IOC_SNAP_CREATE_V2 _IOW(BTRFS_IOCTL_MAGIC, 23, \
 203                                    struct btrfs_ioctl_vol_args_v2)
 204 #define BTRFS_IOC_SUBVOL_GETFLAGS _IOW(BTRFS_IOCTL_MAGIC, 25, __u64)
 205 #define BTRFS_IOC_SUBVOL_SETFLAGS _IOW(BTRFS_IOCTL_MAGIC, 26, __u64)
 206 #endif