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
  35 #define BTRFS_SUBVOL_NAME_MAX 4039
  36 struct btrfs_ioctl_vol_args_v2 {
  37         __s64 fd;
  38         __u64 transid;
  39         __u64 flags;
  40         __u64 unused[4];
  41         char name[BTRFS_SUBVOL_NAME_MAX + 1];
  42 };
  43
  44 #define BTRFS_INO_LOOKUP_PATH_MAX 4080
  45 struct btrfs_ioctl_ino_lookup_args {
  46         __u64 treeid;
  47         __u64 objectid;
  48         char name[BTRFS_INO_LOOKUP_PATH_MAX];
  49 };
  50
  51 struct btrfs_ioctl_search_key {
  52         /* which root are we searching.  0 is the tree of tree roots */
  53         __u64 tree_id;
  54
  55         /* keys returned will be >= min and <= max */
  56         __u64 min_objectid;
  57         __u64 max_objectid;
  58
  59         /* keys returned will be >= min and <= max */
  60         __u64 min_offset;
  61         __u64 max_offset;
  62
  63         /* max and min transids to search for */
  64         __u64 min_transid;
  65         __u64 max_transid;
  66
  67         /* keys returned will be >= min and <= max */
  68         __u32 min_type;
  69         __u32 max_type;
  70
  71         /*
  72          * how many items did userland ask for, and how many are we
  73          * returning
  74          */
  75         __u32 nr_items;
  76
  77         /* align to 64 bits */
  78         __u32 unused;
  79
  80         /* some extra for later */
  81         __u64 unused1;
  82         __u64 unused2;
  83         __u64 unused3;
  84         __u64 unused4;
  85 };
  86
  87 struct btrfs_ioctl_search_header {
  88         __u64 transid;
  89         __u64 objectid;
  90         __u64 offset;
  91         __u32 type;
  92         __u32 len;
  93 };
  94
  95 #define BTRFS_SEARCH_ARGS_BUFSIZE (4096 - sizeof(struct btrfs_ioctl_search_key))
  96 /*
  97  * the buf is an array of search headers where
  98  * each header is followed by the actual item
  99  * the type field is expanded to 32 bits for alignment
 100  */
 101 struct btrfs_ioctl_search_args {
 102         struct btrfs_ioctl_search_key key;
 103         char buf[BTRFS_SEARCH_ARGS_BUFSIZE];
 104 };
 105
 106 struct btrfs_ioctl_clone_range_args {
 107   __s64 src_fd;
 108   __u64 src_offset, src_length;
 109   __u64 dest_offset;
 110 };
 111
 112 /* flags for the defrag range ioctl */
 113 #define BTRFS_DEFRAG_RANGE_COMPRESS 1
 114 #define BTRFS_DEFRAG_RANGE_START_IO 2
 115
 116 struct btrfs_ioctl_defrag_range_args {
 117         /* start of the defrag operation */
 118         __u64 start;
 119
 120         /* number of bytes to defrag, use (u64)-1 to say all */
 121         __u64 len;
 122
 123         /*
 124          * flags for the operation, which can include turning
 125          * on compression for this one defrag
 126          */
 127         __u64 flags;
 128
 129         /*
 130          * any extent bigger than this will be considered
 131          * already defragged.  Use 0 to take the kernel default
 132          * Use 1 to say every single extent must be rewritten
 133          */
 134         __u32 extent_thresh;
 135
 136         /* spare for later */
 137         __u32 unused[5];
 138 };
 139
 140 struct btrfs_ioctl_space_info {
 141         __u64 flags;
 142         __u64 total_bytes;
 143         __u64 used_bytes;
 144 };
 145
 146 struct btrfs_ioctl_space_args {
 147         __u64 space_slots;
 148         __u64 total_spaces;
 149         struct btrfs_ioctl_space_info spaces[0];
 150 };
 151
 152 #define BTRFS_IOC_SNAP_CREATE _IOW(BTRFS_IOCTL_MAGIC, 1, \
 153                                    struct btrfs_ioctl_vol_args)
 154 #define BTRFS_IOC_DEFRAG _IOW(BTRFS_IOCTL_MAGIC, 2, \
 155                                    struct btrfs_ioctl_vol_args)
 156 #define BTRFS_IOC_RESIZE _IOW(BTRFS_IOCTL_MAGIC, 3, \
 157                                    struct btrfs_ioctl_vol_args)
 158 #define BTRFS_IOC_SCAN_DEV _IOW(BTRFS_IOCTL_MAGIC, 4, \
 159                                    struct btrfs_ioctl_vol_args)
 160 /* trans start and trans end are dangerous, and only for
 161  * use by applications that know how to avoid the
 162  * resulting deadlocks
 163  */
 164 #define BTRFS_IOC_TRANS_START  _IO(BTRFS_IOCTL_MAGIC, 6)
 165 #define BTRFS_IOC_TRANS_END    _IO(BTRFS_IOCTL_MAGIC, 7)
 166 #define BTRFS_IOC_SYNC         _IO(BTRFS_IOCTL_MAGIC, 8)
 167
 168 #define BTRFS_IOC_CLONE        _IOW(BTRFS_IOCTL_MAGIC, 9, int)
 169 #define BTRFS_IOC_ADD_DEV _IOW(BTRFS_IOCTL_MAGIC, 10, \
 170                                    struct btrfs_ioctl_vol_args)
 171 #define BTRFS_IOC_RM_DEV _IOW(BTRFS_IOCTL_MAGIC, 11, \
 172                                    struct btrfs_ioctl_vol_args)
 173 #define BTRFS_IOC_BALANCE _IOW(BTRFS_IOCTL_MAGIC, 12, \
 174                                    struct btrfs_ioctl_vol_args)
 175
 176 #define BTRFS_IOC_CLONE_RANGE _IOW(BTRFS_IOCTL_MAGIC, 13, \
 177                                   struct btrfs_ioctl_clone_range_args)
 178
 179 #define BTRFS_IOC_SUBVOL_CREATE _IOW(BTRFS_IOCTL_MAGIC, 14, \
 180                                    struct btrfs_ioctl_vol_args)
 181 #define BTRFS_IOC_SNAP_DESTROY _IOW(BTRFS_IOCTL_MAGIC, 15, \
 182                                 struct btrfs_ioctl_vol_args)
 183 #define BTRFS_IOC_DEFRAG_RANGE _IOW(BTRFS_IOCTL_MAGIC, 16, \
 184                                 struct btrfs_ioctl_defrag_range_args)
 185 #define BTRFS_IOC_TREE_SEARCH _IOWR(BTRFS_IOCTL_MAGIC, 17, \
 186                                    struct btrfs_ioctl_search_args)
 187 #define BTRFS_IOC_INO_LOOKUP _IOWR(BTRFS_IOCTL_MAGIC, 18, \
 188                                    struct btrfs_ioctl_ino_lookup_args)
 189 #define BTRFS_IOC_DEFAULT_SUBVOL _IOW(BTRFS_IOCTL_MAGIC, 19, u64)
 190 #define BTRFS_IOC_SPACE_INFO _IOWR(BTRFS_IOCTL_MAGIC, 20, \
 191                                     struct btrfs_ioctl_space_args)
 192 #define BTRFS_IOC_START_SYNC _IOR(BTRFS_IOCTL_MAGIC, 24, __u64)
 193 #define BTRFS_IOC_WAIT_SYNC  _IOW(BTRFS_IOCTL_MAGIC, 22, __u64)
 194 #define BTRFS_IOC_SNAP_CREATE_V2 _IOW(BTRFS_IOCTL_MAGIC, 23, \
 195                                    struct btrfs_ioctl_vol_args_v2)
 196 #endif