2 * Copyright (C) 2007 Oracle. All rights reserved.
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.
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.
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.
21 #include <linux/ioctl.h>
23 #define BTRFS_IOCTL_MAGIC 0x94
24 #define BTRFS_VOL_NAME_MAX 255
26 /* this should be 4k */
27 #define BTRFS_PATH_NAME_MAX 4087
28 struct btrfs_ioctl_vol_args {
30 char name[BTRFS_PATH_NAME_MAX + 1];
33 #define BTRFS_SUBVOL_CREATE_ASYNC (1ULL << 0)
34 #define BTRFS_SUBVOL_RDONLY (1ULL << 1)
36 #define BTRFS_SUBVOL_NAME_MAX 4039
37 struct btrfs_ioctl_vol_args_v2 {
42 char name[BTRFS_SUBVOL_NAME_MAX + 1];
46 * structure to report errors and progress to userspace, either as a
47 * result of a finished scrub, a canceled scrub or a progress inquiry
49 struct btrfs_scrub_progress {
50 __u64 data_extents_scrubbed; /* # of data extents scrubbed */
51 __u64 tree_extents_scrubbed; /* # of tree extents scrubbed */
52 __u64 data_bytes_scrubbed; /* # of data bytes scrubbed */
53 __u64 tree_bytes_scrubbed; /* # of tree bytes scrubbed */
54 __u64 read_errors; /* # of read errors encountered (EIO) */
55 __u64 csum_errors; /* # of failed csum checks */
56 __u64 verify_errors; /* # of occurences, where the metadata
57 * of a tree block did not match the
58 * expected values, like generation or
60 __u64 no_csum; /* # of 4k data block for which no csum
61 * is present, probably the result of
62 * data written with nodatasum */
63 __u64 csum_discards; /* # of csum for which no data was found
64 * in the extent tree. */
65 __u64 super_errors; /* # of bad super blocks encountered */
66 __u64 malloc_errors; /* # of internal kmalloc errors. These
67 * will likely cause an incomplete
69 __u64 uncorrectable_errors; /* # of errors where either no intact
70 * copy was found or the writeback
72 __u64 corrected_errors; /* # of errors corrected */
73 __u64 last_physical; /* last physical address scrubbed. In
74 * case a scrub was aborted, this can
75 * be used to restart the scrub */
76 __u64 unverified_errors; /* # of occurences where a read for a
77 * full (64k) bio failed, but the re-
78 * check succeeded for each 4k piece.
79 * Intermittent error. */
82 #define BTRFS_INO_LOOKUP_PATH_MAX 4080
83 struct btrfs_ioctl_ino_lookup_args {
86 char name[BTRFS_INO_LOOKUP_PATH_MAX];
89 struct btrfs_ioctl_search_key {
90 /* which root are we searching. 0 is the tree of tree roots */
93 /* keys returned will be >= min and <= max */
97 /* keys returned will be >= min and <= max */
101 /* max and min transids to search for */
105 /* keys returned will be >= min and <= max */
110 * how many items did userland ask for, and how many are we
115 /* align to 64 bits */
118 /* some extra for later */
125 struct btrfs_ioctl_search_header {
133 #define BTRFS_SEARCH_ARGS_BUFSIZE (4096 - sizeof(struct btrfs_ioctl_search_key))
135 * the buf is an array of search headers where
136 * each header is followed by the actual item
137 * the type field is expanded to 32 bits for alignment
139 struct btrfs_ioctl_search_args {
140 struct btrfs_ioctl_search_key key;
141 char buf[BTRFS_SEARCH_ARGS_BUFSIZE];
144 struct btrfs_ioctl_clone_range_args {
146 __u64 src_offset, src_length;
150 /* flags for the defrag range ioctl */
151 #define BTRFS_DEFRAG_RANGE_COMPRESS 1
152 #define BTRFS_DEFRAG_RANGE_START_IO 2
154 struct btrfs_ioctl_defrag_range_args {
155 /* start of the defrag operation */
158 /* number of bytes to defrag, use (u64)-1 to say all */
162 * flags for the operation, which can include turning
163 * on compression for this one defrag
168 * any extent bigger than this will be considered
169 * already defragged. Use 0 to take the kernel default
170 * Use 1 to say every single extent must be rewritten
175 * which compression method to use if turning on compression
176 * for this defrag operation. If unspecified, zlib will
181 /* spare for later */
185 struct btrfs_ioctl_space_info {
191 struct btrfs_ioctl_space_args {
194 struct btrfs_ioctl_space_info spaces[0];
197 #define BTRFS_IOC_SNAP_CREATE _IOW(BTRFS_IOCTL_MAGIC, 1, \
198 struct btrfs_ioctl_vol_args)
199 #define BTRFS_IOC_DEFRAG _IOW(BTRFS_IOCTL_MAGIC, 2, \
200 struct btrfs_ioctl_vol_args)
201 #define BTRFS_IOC_RESIZE _IOW(BTRFS_IOCTL_MAGIC, 3, \
202 struct btrfs_ioctl_vol_args)
203 #define BTRFS_IOC_SCAN_DEV _IOW(BTRFS_IOCTL_MAGIC, 4, \
204 struct btrfs_ioctl_vol_args)
205 /* trans start and trans end are dangerous, and only for
206 * use by applications that know how to avoid the
207 * resulting deadlocks
209 #define BTRFS_IOC_TRANS_START _IO(BTRFS_IOCTL_MAGIC, 6)
210 #define BTRFS_IOC_TRANS_END _IO(BTRFS_IOCTL_MAGIC, 7)
211 #define BTRFS_IOC_SYNC _IO(BTRFS_IOCTL_MAGIC, 8)
213 #define BTRFS_IOC_CLONE _IOW(BTRFS_IOCTL_MAGIC, 9, int)
214 #define BTRFS_IOC_ADD_DEV _IOW(BTRFS_IOCTL_MAGIC, 10, \
215 struct btrfs_ioctl_vol_args)
216 #define BTRFS_IOC_RM_DEV _IOW(BTRFS_IOCTL_MAGIC, 11, \
217 struct btrfs_ioctl_vol_args)
218 #define BTRFS_IOC_BALANCE _IOW(BTRFS_IOCTL_MAGIC, 12, \
219 struct btrfs_ioctl_vol_args)
221 #define BTRFS_IOC_CLONE_RANGE _IOW(BTRFS_IOCTL_MAGIC, 13, \
222 struct btrfs_ioctl_clone_range_args)
224 #define BTRFS_IOC_SUBVOL_CREATE _IOW(BTRFS_IOCTL_MAGIC, 14, \
225 struct btrfs_ioctl_vol_args)
226 #define BTRFS_IOC_SNAP_DESTROY _IOW(BTRFS_IOCTL_MAGIC, 15, \
227 struct btrfs_ioctl_vol_args)
228 #define BTRFS_IOC_DEFRAG_RANGE _IOW(BTRFS_IOCTL_MAGIC, 16, \
229 struct btrfs_ioctl_defrag_range_args)
230 #define BTRFS_IOC_TREE_SEARCH _IOWR(BTRFS_IOCTL_MAGIC, 17, \
231 struct btrfs_ioctl_search_args)
232 #define BTRFS_IOC_INO_LOOKUP _IOWR(BTRFS_IOCTL_MAGIC, 18, \
233 struct btrfs_ioctl_ino_lookup_args)
234 #define BTRFS_IOC_DEFAULT_SUBVOL _IOW(BTRFS_IOCTL_MAGIC, 19, u64)
235 #define BTRFS_IOC_SPACE_INFO _IOWR(BTRFS_IOCTL_MAGIC, 20, \
236 struct btrfs_ioctl_space_args)
237 #define BTRFS_IOC_START_SYNC _IOR(BTRFS_IOCTL_MAGIC, 24, __u64)
238 #define BTRFS_IOC_WAIT_SYNC _IOW(BTRFS_IOCTL_MAGIC, 22, __u64)
239 #define BTRFS_IOC_SNAP_CREATE_V2 _IOW(BTRFS_IOCTL_MAGIC, 23, \
240 struct btrfs_ioctl_vol_args_v2)
241 #define BTRFS_IOC_SUBVOL_GETFLAGS _IOW(BTRFS_IOCTL_MAGIC, 25, __u64)
242 #define BTRFS_IOC_SUBVOL_SETFLAGS _IOW(BTRFS_IOCTL_MAGIC, 26, __u64)