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 #define BTRFS_PATH_NAME_MAX 4087
  26
  27 /* this should be 4k */
  28 struct btrfs_ioctl_vol_args {
  29         __s64 fd;
  30         char name[BTRFS_PATH_NAME_MAX + 1];
  31 };
  32
  33 #define BTRFS_INO_LOOKUP_PATH_MAX 4080
  34 struct btrfs_ioctl_ino_lookup_args {
  35         __u64 treeid;
  36         __u64 objectid;
  37         char name[BTRFS_INO_LOOKUP_PATH_MAX];
  38 };
  39
  40 struct btrfs_ioctl_search_key {
  41         /* which root are we searching.  0 is the tree of tree roots */
  42         __u64 tree_id;
  43
  44         /* keys returned will be >= min and <= max */
  45         __u64 min_objectid;
  46         __u64 max_objectid;
  47
  48         /* keys returned will be >= min and <= max */
  49         __u64 min_offset;
  50         __u64 max_offset;
  51
  52         /* max and min transids to search for */
  53         __u64 min_transid;
  54         __u64 max_transid;
  55
  56         /* keys returned will be >= min and <= max */
  57         __u32 min_type;
  58         __u32 max_type;
  59
  60         /*
  61          * how many items did userland ask for, and how many are we
  62          * returning
  63          */
  64         __u32 nr_items;
  65
  66         /* align to 64 bits */
  67         __u32 unused;
  68
  69         /* some extra for later */
  70         __u64 unused1;
  71         __u64 unused2;
  72         __u64 unused3;
  73         __u64 unused4;
  74 };
  75
  76 struct btrfs_ioctl_search_header {
  77         __u64 transid;
  78         __u64 objectid;
  79         __u64 offset;
  80         __u32 type;
  81         __u32 len;
  82 };
  83
  84 #define BTRFS_SEARCH_ARGS_BUFSIZE (4096 - sizeof(struct btrfs_ioctl_search_key))
  85 /*
  86  * the buf is an array of search headers where
  87  * each header is followed by the actual item
  88  * the type field is expanded to 32 bits for alignment
  89  */
  90 struct btrfs_ioctl_search_args {
  91         struct btrfs_ioctl_search_key key;
  92         char buf[BTRFS_SEARCH_ARGS_BUFSIZE];
  93 };
  94
  95 struct btrfs_ioctl_clone_range_args {
  96   __s64 src_fd;
  97   __u64 src_offset, src_length;
  98   __u64 dest_offset;
  99 };
 100
 101 /* flags for the defrag range ioctl */
 102 #define BTRFS_DEFRAG_RANGE_COMPRESS 1
 103 #define BTRFS_DEFRAG_RANGE_START_IO 2
 104
 105 struct btrfs_ioctl_defrag_range_args {
 106         /* start of the defrag operation */
 107         __u64 start;
 108
 109         /* number of bytes to defrag, use (u64)-1 to say all */
 110         __u64 len;
 111
 112         /*
 113          * flags for the operation, which can include turning
 114          * on compression for this one defrag
 115          */
 116         __u64 flags;
 117
 118         /*
 119          * any extent bigger than this will be considered
 120          * already defragged.  Use 0 to take the kernel default
 121          * Use 1 to say every single extent must be rewritten
 122          */
 123         __u32 extent_thresh;
 124
 125         /* spare for later */
 126         __u32 unused[5];
 127 };
 128
 129 struct btrfs_ioctl_space_info {
 130         __u64 flags;
 131         __u64 total_bytes;
 132         __u64 used_bytes;
 133 };
 134
 135 struct btrfs_ioctl_space_args {
 136         __u64 space_slots;
 137         __u64 total_spaces;
 138         struct btrfs_ioctl_space_info spaces[0];
 139 };
 140
 141 #define BTRFS_IOC_SNAP_CREATE _IOW(BTRFS_IOCTL_MAGIC, 1, \
 142                                    struct btrfs_ioctl_vol_args)
 143 #define BTRFS_IOC_DEFRAG _IOW(BTRFS_IOCTL_MAGIC, 2, \
 144                                    struct btrfs_ioctl_vol_args)
 145 #define BTRFS_IOC_RESIZE _IOW(BTRFS_IOCTL_MAGIC, 3, \
 146                                    struct btrfs_ioctl_vol_args)
 147 #define BTRFS_IOC_SCAN_DEV _IOW(BTRFS_IOCTL_MAGIC, 4, \
 148                                    struct btrfs_ioctl_vol_args)
 149 /* trans start and trans end are dangerous, and only for
 150  * use by applications that know how to avoid the
 151  * resulting deadlocks
 152  */
 153 #define BTRFS_IOC_TRANS_START  _IO(BTRFS_IOCTL_MAGIC, 6)
 154 #define BTRFS_IOC_TRANS_END    _IO(BTRFS_IOCTL_MAGIC, 7)
 155 #define BTRFS_IOC_SYNC         _IO(BTRFS_IOCTL_MAGIC, 8)
 156
 157 #define BTRFS_IOC_CLONE        _IOW(BTRFS_IOCTL_MAGIC, 9, int)
 158 #define BTRFS_IOC_ADD_DEV _IOW(BTRFS_IOCTL_MAGIC, 10, \
 159                                    struct btrfs_ioctl_vol_args)
 160 #define BTRFS_IOC_RM_DEV _IOW(BTRFS_IOCTL_MAGIC, 11, \
 161                                    struct btrfs_ioctl_vol_args)
 162 #define BTRFS_IOC_BALANCE _IOW(BTRFS_IOCTL_MAGIC, 12, \
 163                                    struct btrfs_ioctl_vol_args)
 164
 165 #define BTRFS_IOC_CLONE_RANGE _IOW(BTRFS_IOCTL_MAGIC, 13, \
 166                                   struct btrfs_ioctl_clone_range_args)
 167
 168 #define BTRFS_IOC_SUBVOL_CREATE _IOW(BTRFS_IOCTL_MAGIC, 14, \
 169                                    struct btrfs_ioctl_vol_args)
 170 #define BTRFS_IOC_SNAP_DESTROY _IOW(BTRFS_IOCTL_MAGIC, 15, \
 171                                 struct btrfs_ioctl_vol_args)
 172 #define BTRFS_IOC_DEFRAG_RANGE _IOW(BTRFS_IOCTL_MAGIC, 16, \
 173                                 struct btrfs_ioctl_defrag_range_args)
 174 #define BTRFS_IOC_TREE_SEARCH _IOWR(BTRFS_IOCTL_MAGIC, 17, \
 175                                    struct btrfs_ioctl_search_args)
 176 #define BTRFS_IOC_INO_LOOKUP _IOWR(BTRFS_IOCTL_MAGIC, 18, \
 177                                    struct btrfs_ioctl_ino_lookup_args)
 178 #define BTRFS_IOC_DEFAULT_SUBVOL _IOW(BTRFS_IOCTL_MAGIC, 19, u64)
 179 #define BTRFS_IOC_SPACE_INFO _IOWR(BTRFS_IOCTL_MAGIC, 20, \
 180                                     struct btrfs_ioctl_space_args)
 181 #endif