Root/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 */
28struct 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
34struct btrfs_ioctl_ino_lookup_args {
35    __u64 treeid;
36    __u64 objectid;
37    char name[BTRFS_INO_LOOKUP_PATH_MAX];
38};
39
40struct 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
76struct 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 */
90struct btrfs_ioctl_search_args {
91    struct btrfs_ioctl_search_key key;
92    char buf[BTRFS_SEARCH_ARGS_BUFSIZE];
93};
94
95struct 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
105struct 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
129struct btrfs_ioctl_space_info {
130    __u64 flags;
131    __u64 total_bytes;
132    __u64 used_bytes;
133};
134
135struct 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
182

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