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 <asm/types.h>
  22 #include <linux/ioctl.h>
  23
  24 #define BTRFS_IOCTL_MAGIC 0x94
  25 #define BTRFS_VOL_NAME_MAX 255
  26 #define BTRFS_PATH_NAME_MAX 4087
  27
  28 struct btrfs_ioctl_vol_args {
  29         __s64 fd;
  30         char name[BTRFS_PATH_NAME_MAX + 1];
  31 };
  32
  33 struct btrfs_ioctl_search_key {
  34         /* which root are we searching.  0 is the tree of tree roots */
  35         __u64 tree_id;
  36
  37         /* keys returned will be >= min and <= max */
  38         __u64 min_objectid;
  39         __u64 max_objectid;
  40
  41         /* keys returned will be >= min and <= max */
  42         __u64 min_offset;
  43         __u64 max_offset;
  44
  45         /* max and min transids to search for */
  46         __u64 min_transid;
  47         __u64 max_transid;
  48
  49         /* keys returned will be >= min and <= max */
  50         __u32 min_type;
  51         __u32 max_type;
  52
  53         /*
  54          * how many items did userland ask for, and how many are we
  55          * returning
  56          */
  57         __u32 nr_items;
  58
  59         /* align to 64 bits */
  60         __u32 unused;
  61
  62         /* some extra for later */
  63         __u64 unused1;
  64         __u64 unused2;
  65         __u64 unused3;
  66         __u64 unused4;
  67 };
  68
  69 struct btrfs_ioctl_search_header {
  70         __u64 transid;
  71         __u64 objectid;
  72         __u64 offset;
  73         __u32 type;
  74         __u32 len;
  75 } __attribute__((may_alias));
  76
  77 #define BTRFS_SEARCH_ARGS_BUFSIZE (4096 - sizeof(struct btrfs_ioctl_search_key))
  78 /*
  79  * the buf is an array of search headers where
  80  * each header is followed by the actual item
  81  * the type field is expanded to 32 bits for alignment
  82  */
  83 struct btrfs_ioctl_search_args {
  84         struct btrfs_ioctl_search_key key;
  85         char buf[BTRFS_SEARCH_ARGS_BUFSIZE];
  86 };
  87
  88 #define BTRFS_INO_LOOKUP_PATH_MAX 4080
  89 struct btrfs_ioctl_ino_lookup_args {
  90         __u64 treeid;
  91         __u64 objectid;
  92         char name[BTRFS_INO_LOOKUP_PATH_MAX];
  93 };
  94
  95 /* flags for the defrag range ioctl */
  96 #define BTRFS_DEFRAG_RANGE_COMPRESS 1
  97 #define BTRFS_DEFRAG_RANGE_START_IO 2
  98
  99 struct btrfs_ioctl_defrag_range_args {
 100         /* start of the defrag operation */
 101         __u64 start;
 102
 103         /* number of bytes to defrag, use (u64)-1 to say all */
 104         __u64 len;
 105
 106         /*
 107          * flags for the operation, which can include turning
 108          * on compression for this one defrag
 109          */
 110         __u64 flags;
 111
 112         /*
 113          * any extent bigger than this will be considered
 114          * already defragged.  Use 0 to take the kernel default
 115          * Use 1 to say every single extent must be rewritten
 116          */
 117         __u32 extent_thresh;
 118
 119         /* spare for later */
 120         __u32 unused[5];
 121 };
 122
 123 struct btrfs_ioctl_space_info {
 124         __u64 flags;
 125         __u64 total_bytes;
 126         __u64 used_bytes;
 127 };
 128
 129 struct btrfs_ioctl_space_args {
 130         __u64 space_slots;
 131         __u64 total_spaces;
 132         struct btrfs_ioctl_space_info spaces[0];
 133 };
 134
 135 #define BTRFS_IOC_SNAP_CREATE _IOW(BTRFS_IOCTL_MAGIC, 1, \
 136                                    struct btrfs_ioctl_vol_args)
 137 #define BTRFS_IOC_DEFRAG _IOW(BTRFS_IOCTL_MAGIC, 2, \
 138                                    struct btrfs_ioctl_vol_args)
 139 #define BTRFS_IOC_RESIZE _IOW(BTRFS_IOCTL_MAGIC, 3, \
 140                                    struct btrfs_ioctl_vol_args)
 141 #define BTRFS_IOC_SCAN_DEV _IOW(BTRFS_IOCTL_MAGIC, 4, \
 142                                    struct btrfs_ioctl_vol_args)
 143 /* trans start and trans end are dangerous, and only for
 144  * use by applications that know how to avoid the
 145  * resulting deadlocks
 146  */
 147 #define BTRFS_IOC_TRANS_START  _IO(BTRFS_IOCTL_MAGIC, 6)
 148 #define BTRFS_IOC_TRANS_END    _IO(BTRFS_IOCTL_MAGIC, 7)
 149 #define BTRFS_IOC_SYNC         _IO(BTRFS_IOCTL_MAGIC, 8)
 150
 151 #define BTRFS_IOC_CLONE        _IOW(BTRFS_IOCTL_MAGIC, 9, int)
 152 #define BTRFS_IOC_ADD_DEV _IOW(BTRFS_IOCTL_MAGIC, 10, \
 153                                    struct btrfs_ioctl_vol_args)
 154 #define BTRFS_IOC_RM_DEV _IOW(BTRFS_IOCTL_MAGIC, 11, \
 155                                    struct btrfs_ioctl_vol_args)
 156 #define BTRFS_IOC_BALANCE _IOW(BTRFS_IOCTL_MAGIC, 12, \
 157                                    struct btrfs_ioctl_vol_args)
 158 /* 13 is for CLONE_RANGE */
 159 #define BTRFS_IOC_SUBVOL_CREATE _IOW(BTRFS_IOCTL_MAGIC, 14, \
 160                                    struct btrfs_ioctl_vol_args)
 161 #define BTRFS_IOC_SNAP_DESTROY _IOW(BTRFS_IOCTL_MAGIC, 15, \
 162                                    struct btrfs_ioctl_vol_args)
 163 #define BTRFS_IOC_DEFRAG_RANGE _IOW(BTRFS_IOCTL_MAGIC, 16, \
 164                                 struct btrfs_ioctl_defrag_range_args)
 165 #define BTRFS_IOC_TREE_SEARCH _IOWR(BTRFS_IOCTL_MAGIC, 17, \
 166                                    struct btrfs_ioctl_search_args)
 167 #define BTRFS_IOC_INO_LOOKUP _IOWR(BTRFS_IOCTL_MAGIC, 18, \
 168                                    struct btrfs_ioctl_ino_lookup_args)
 169 #define BTRFS_IOC_DEFAULT_SUBVOL _IOW(BTRFS_IOCTL_MAGIC, 19, u64)
 170 #define BTRFS_IOC_SPACE_INFO _IOWR(BTRFS_IOCTL_MAGIC, 20, \
 171                                     struct btrfs_ioctl_space_args)
 172 #endif