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_SNAPSHOT_NAME_MAX 4079
  34 struct btrfs_ioctl_async_vol_args {
  35         __s64 fd;
  36         __u64 transid;
  37         char name[BTRFS_SNAPSHOT_NAME_MAX + 1];
  38 };
  39
  40 #define BTRFS_INO_LOOKUP_PATH_MAX 4080
  41 struct btrfs_ioctl_ino_lookup_args {
  42         __u64 treeid;
  43         __u64 objectid;
  44         char name[BTRFS_INO_LOOKUP_PATH_MAX];
  45 };
  46
  47 struct btrfs_ioctl_search_key {
  48         /* which root are we searching.  0 is the tree of tree roots */
  49         __u64 tree_id;
  50
  51         /* keys returned will be >= min and <= max */
  52         __u64 min_objectid;
  53         __u64 max_objectid;
  54
  55         /* keys returned will be >= min and <= max */
  56         __u64 min_offset;
  57         __u64 max_offset;
  58
  59         /* max and min transids to search for */
  60         __u64 min_transid;
  61         __u64 max_transid;
  62
  63         /* keys returned will be >= min and <= max */
  64         __u32 min_type;
  65         __u32 max_type;
  66
  67         /*
  68          * how many items did userland ask for, and how many are we
  69          * returning
  70          */
  71         __u32 nr_items;
  72
  73         /* align to 64 bits */
  74         __u32 unused;
  75
  76         /* some extra for later */
  77         __u64 unused1;
  78         __u64 unused2;
  79         __u64 unused3;
  80         __u64 unused4;
  81 };
  82
  83 struct btrfs_ioctl_search_header {
  84         __u64 transid;
  85         __u64 objectid;
  86         __u64 offset;
  87         __u32 type;
  88         __u32 len;
  89 };
  90
  91 #define BTRFS_SEARCH_ARGS_BUFSIZE (4096 - sizeof(struct btrfs_ioctl_search_key))
  92 /*
  93  * the buf is an array of search headers where
  94  * each header is followed by the actual item
  95  * the type field is expanded to 32 bits for alignment
  96  */
  97 struct btrfs_ioctl_search_args {
  98         struct btrfs_ioctl_search_key key;
  99         char buf[BTRFS_SEARCH_ARGS_BUFSIZE];
 100 };
 101
 102 struct btrfs_ioctl_clone_range_args {
 103   __s64 src_fd;
 104   __u64 src_offset, src_length;
 105   __u64 dest_offset;
 106 };
 107
 108 /* flags for the defrag range ioctl */
 109 #define BTRFS_DEFRAG_RANGE_COMPRESS 1
 110 #define BTRFS_DEFRAG_RANGE_START_IO 2
 111
 112 struct btrfs_ioctl_defrag_range_args {
 113         /* start of the defrag operation */
 114         __u64 start;
 115
 116         /* number of bytes to defrag, use (u64)-1 to say all */
 117         __u64 len;
 118
 119         /*
 120          * flags for the operation, which can include turning
 121          * on compression for this one defrag
 122          */
 123         __u64 flags;
 124
 125         /*
 126          * any extent bigger than this will be considered
 127          * already defragged.  Use 0 to take the kernel default
 128          * Use 1 to say every single extent must be rewritten
 129          */
 130         __u32 extent_thresh;
 131
 132         /* spare for later */
 133         __u32 unused[5];
 134 };
 135
 136 struct btrfs_ioctl_space_info {
 137         __u64 flags;
 138         __u64 total_bytes;
 139         __u64 used_bytes;
 140 };
 141
 142 struct btrfs_ioctl_space_args {
 143         __u64 space_slots;
 144         __u64 total_spaces;
 145         struct btrfs_ioctl_space_info spaces[0];
 146 };
 147
 148 #define BTRFS_IOC_SNAP_CREATE _IOW(BTRFS_IOCTL_MAGIC, 1, \
 149                                    struct btrfs_ioctl_vol_args)
 150 #define BTRFS_IOC_DEFRAG _IOW(BTRFS_IOCTL_MAGIC, 2, \
 151                                    struct btrfs_ioctl_vol_args)
 152 #define BTRFS_IOC_RESIZE _IOW(BTRFS_IOCTL_MAGIC, 3, \
 153                                    struct btrfs_ioctl_vol_args)
 154 #define BTRFS_IOC_SCAN_DEV _IOW(BTRFS_IOCTL_MAGIC, 4, \
 155                                    struct btrfs_ioctl_vol_args)
 156 /* trans start and trans end are dangerous, and only for
 157  * use by applications that know how to avoid the
 158  * resulting deadlocks
 159  */
 160 #define BTRFS_IOC_TRANS_START  _IO(BTRFS_IOCTL_MAGIC, 6)
 161 #define BTRFS_IOC_TRANS_END    _IO(BTRFS_IOCTL_MAGIC, 7)
 162 #define BTRFS_IOC_SYNC         _IO(BTRFS_IOCTL_MAGIC, 8)
 163
 164 #define BTRFS_IOC_CLONE        _IOW(BTRFS_IOCTL_MAGIC, 9, int)
 165 #define BTRFS_IOC_ADD_DEV _IOW(BTRFS_IOCTL_MAGIC, 10, \
 166                                    struct btrfs_ioctl_vol_args)
 167 #define BTRFS_IOC_RM_DEV _IOW(BTRFS_IOCTL_MAGIC, 11, \
 168                                    struct btrfs_ioctl_vol_args)
 169 #define BTRFS_IOC_BALANCE _IOW(BTRFS_IOCTL_MAGIC, 12, \
 170                                    struct btrfs_ioctl_vol_args)
 171
 172 #define BTRFS_IOC_CLONE_RANGE _IOW(BTRFS_IOCTL_MAGIC, 13, \
 173                                   struct btrfs_ioctl_clone_range_args)
 174
 175 #define BTRFS_IOC_SUBVOL_CREATE _IOW(BTRFS_IOCTL_MAGIC, 14, \
 176                                    struct btrfs_ioctl_vol_args)
 177 #define BTRFS_IOC_SNAP_DESTROY _IOW(BTRFS_IOCTL_MAGIC, 15, \
 178                                 struct btrfs_ioctl_vol_args)
 179 #define BTRFS_IOC_DEFRAG_RANGE _IOW(BTRFS_IOCTL_MAGIC, 16, \
 180                                 struct btrfs_ioctl_defrag_range_args)
 181 #define BTRFS_IOC_TREE_SEARCH _IOWR(BTRFS_IOCTL_MAGIC, 17, \
 182                                    struct btrfs_ioctl_search_args)
 183 #define BTRFS_IOC_INO_LOOKUP _IOWR(BTRFS_IOCTL_MAGIC, 18, \
 184                                    struct btrfs_ioctl_ino_lookup_args)
 185 #define BTRFS_IOC_DEFAULT_SUBVOL _IOW(BTRFS_IOCTL_MAGIC, 19, u64)
 186 #define BTRFS_IOC_SPACE_INFO _IOWR(BTRFS_IOCTL_MAGIC, 20, \
 187                                     struct btrfs_ioctl_space_args)
 188 #define BTRFS_IOC_START_SYNC _IOR(BTRFS_IOCTL_MAGIC, 24, __u64)
 189 #define BTRFS_IOC_WAIT_SYNC  _IOW(BTRFS_IOCTL_MAGIC, 22, __u64)
 190 #define BTRFS_IOC_SNAP_CREATE_ASYNC _IOW(BTRFS_IOCTL_MAGIC, 23, \
 191                                    struct btrfs_ioctl_async_vol_args)
 192 #endif