fs/btrfs/ioctl.h

   1
   2 /*
   3  * Copyright (C) 2007 Oracle.  All rights reserved.
   4  *
   5  * This program is free software; you can redistribute it and/or
   6  * modify it under the terms of the GNU General Public
   7  * License v2 as published by the Free Software Foundation.
   8  *
   9  * This program is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12  * General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU General Public
  15  * License along with this program; if not, write to the
  16  * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  17  * Boston, MA 021110-1307, USA.
  18  */
  19
  20 #ifndef __IOCTL_
  21 #define __IOCTL_
  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 /* this should be 4k */
  29 struct btrfs_ioctl_vol_args {
  30         __s64 fd;
  31         char name[BTRFS_PATH_NAME_MAX + 1];
  32 };
  33
  34 #define BTRFS_INO_LOOKUP_PATH_MAX 4080
  35 struct btrfs_ioctl_ino_lookup_args {
  36         __u64 treeid;
  37         __u64 objectid;
  38         char name[BTRFS_INO_LOOKUP_PATH_MAX];
  39 };
  40
  41 struct btrfs_ioctl_search_key {
  42         /* which root are we searching.  0 is the tree of tree roots */
  43         __u64 tree_id;
  44
  45         /* keys returned will be >= min and <= max */
  46         __u64 min_objectid;
  47         __u64 max_objectid;
  48
  49         /* keys returned will be >= min and <= max */
  50         __u64 min_offset;
  51         __u64 max_offset;
  52
  53         /* max and min transids to search for */
  54         __u64 min_transid;
  55         __u64 max_transid;
  56
  57         /* keys returned will be >= min and <= max */
  58         __u32 min_type;
  59         __u32 max_type;
  60
  61         /*
  62          * how many items did userland ask for, and how many are we
  63          * returning
  64          */
  65         __u32 nr_items;
  66
  67         /* align to 64 bits */
  68         __u32 unused;
  69
  70         /* some extra for later */
  71         __u64 unused1;
  72         __u64 unused2;
  73         __u64 unused3;
  74         __u64 unused4;
  75 };
  76
  77 struct btrfs_ioctl_search_header {
  78         __u64 transid;
  79         __u64 objectid;
  80         __u64 offset;
  81         __u32 type;
  82         __u32 len;
  83 };
  84
  85 #define BTRFS_SEARCH_ARGS_BUFSIZE (4096 - sizeof(struct btrfs_ioctl_search_key))
  86 /*
  87  * the buf is an array of search headers where
  88  * each header is followed by the actual item
  89  * the type field is expanded to 32 bits for alignment
  90  */
  91 struct btrfs_ioctl_search_args {
  92         struct btrfs_ioctl_search_key key;
  93         char buf[BTRFS_SEARCH_ARGS_BUFSIZE];
  94 };
  95
  96 struct btrfs_ioctl_clone_range_args {
  97   __s64 src_fd;
  98   __u64 src_offset, src_length;
  99   __u64 dest_offset;
 100 };
 101
 102 /* flags for the defrag range ioctl */
 103 #define BTRFS_DEFRAG_RANGE_COMPRESS 1
 104 #define BTRFS_DEFRAG_RANGE_START_IO 2
 105
 106 struct btrfs_ioctl_defrag_range_args {
 107         /* start of the defrag operation */
 108         __u64 start;
 109
 110         /* number of bytes to defrag, use (u64)-1 to say all */
 111         __u64 len;
 112
 113         /*
 114          * flags for the operation, which can include turning
 115          * on compression for this one defrag
 116          */
 117         __u64 flags;
 118
 119         /*
 120          * any extent bigger than this will be considered
 121          * already defragged.  Use 0 to take the kernel default
 122          * Use 1 to say every single extent must be rewritten
 123          */
 124         __u32 extent_thresh;
 125
 126         /* spare for later */
 127         __u32 unused[5];
 128 };
 129
 130
 131 #define BTRFS_IOC_SNAP_CREATE _IOW(BTRFS_IOCTL_MAGIC, 1, \
 132                                    struct btrfs_ioctl_vol_args)
 133 #define BTRFS_IOC_DEFRAG _IOW(BTRFS_IOCTL_MAGIC, 2, \
 134                                    struct btrfs_ioctl_vol_args)
 135 #define BTRFS_IOC_RESIZE _IOW(BTRFS_IOCTL_MAGIC, 3, \
 136                                    struct btrfs_ioctl_vol_args)
 137 #define BTRFS_IOC_SCAN_DEV _IOW(BTRFS_IOCTL_MAGIC, 4, \
 138                                    struct btrfs_ioctl_vol_args)
 139 /* trans start and trans end are dangerous, and only for
 140  * use by applications that know how to avoid the
 141  * resulting deadlocks
 142  */
 143 #define BTRFS_IOC_TRANS_START  _IO(BTRFS_IOCTL_MAGIC, 6)
 144 #define BTRFS_IOC_TRANS_END    _IO(BTRFS_IOCTL_MAGIC, 7)
 145 #define BTRFS_IOC_SYNC         _IO(BTRFS_IOCTL_MAGIC, 8)
 146
 147 #define BTRFS_IOC_CLONE        _IOW(BTRFS_IOCTL_MAGIC, 9, int)
 148 #define BTRFS_IOC_ADD_DEV _IOW(BTRFS_IOCTL_MAGIC, 10, \
 149                                    struct btrfs_ioctl_vol_args)
 150 #define BTRFS_IOC_RM_DEV _IOW(BTRFS_IOCTL_MAGIC, 11, \
 151                                    struct btrfs_ioctl_vol_args)
 152 #define BTRFS_IOC_BALANCE _IOW(BTRFS_IOCTL_MAGIC, 12, \
 153                                    struct btrfs_ioctl_vol_args)
 154
 155 #define BTRFS_IOC_CLONE_RANGE _IOW(BTRFS_IOCTL_MAGIC, 13, \
 156                                   struct btrfs_ioctl_clone_range_args)
 157
 158 #define BTRFS_IOC_SUBVOL_CREATE _IOW(BTRFS_IOCTL_MAGIC, 14, \
 159                                    struct btrfs_ioctl_vol_args)
 160 #define BTRFS_IOC_SNAP_DESTROY _IOW(BTRFS_IOCTL_MAGIC, 15, \
 161                                 struct btrfs_ioctl_vol_args)
 162 #define BTRFS_IOC_DEFRAG_RANGE _IOW(BTRFS_IOCTL_MAGIC, 16, \
 163                                 struct btrfs_ioctl_defrag_range_args)
 164 #define BTRFS_IOC_TREE_SEARCH _IOWR(BTRFS_IOCTL_MAGIC, 17, \
 165                                    struct btrfs_ioctl_search_args)
 166 #define BTRFS_IOC_INO_LOOKUP _IOWR(BTRFS_IOCTL_MAGIC, 18, \
 167                                    struct btrfs_ioctl_ino_lookup_args)
 168 #define BTRFS_IOC_DEFAULT_SUBVOL _IOW(BTRFS_IOCTL_MAGIC, 19, u64)
 169 #endif