Root/fs/ocfs2/ocfs2_ioctl.h

1/* -*- mode: c; c-basic-offset: 8; -*-
2 * vim: noexpandtab sw=8 ts=8 sts=0:
3 *
4 * ocfs2_ioctl.h
5 *
6 * Defines OCFS2 ioctls.
7 *
8 * Copyright (C) 2010 Oracle. All rights reserved.
9 *
10 * This program is free software; you can redistribute it and/or
11 * modify it under the terms of the GNU General Public
12 * License, version 2, as published by the Free Software Foundation.
13 *
14 * This program is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
17 * General Public License for more details.
18 */
19
20#ifndef OCFS2_IOCTL_H
21#define OCFS2_IOCTL_H
22
23/*
24 * ioctl commands
25 */
26#define OCFS2_IOC_GETFLAGS FS_IOC_GETFLAGS
27#define OCFS2_IOC_SETFLAGS FS_IOC_SETFLAGS
28#define OCFS2_IOC32_GETFLAGS FS_IOC32_GETFLAGS
29#define OCFS2_IOC32_SETFLAGS FS_IOC32_SETFLAGS
30
31/*
32 * Space reservation / allocation / free ioctls and argument structure
33 * are designed to be compatible with XFS.
34 *
35 * ALLOCSP* and FREESP* are not and will never be supported, but are
36 * included here for completeness.
37 */
38struct ocfs2_space_resv {
39    __s16 l_type;
40    __s16 l_whence;
41    __s64 l_start;
42    __s64 l_len; /* len == 0 means until end of file */
43    __s32 l_sysid;
44    __u32 l_pid;
45    __s32 l_pad[4]; /* reserve area */
46};
47
48#define OCFS2_IOC_ALLOCSP _IOW ('X', 10, struct ocfs2_space_resv)
49#define OCFS2_IOC_FREESP _IOW ('X', 11, struct ocfs2_space_resv)
50#define OCFS2_IOC_RESVSP _IOW ('X', 40, struct ocfs2_space_resv)
51#define OCFS2_IOC_UNRESVSP _IOW ('X', 41, struct ocfs2_space_resv)
52#define OCFS2_IOC_ALLOCSP64 _IOW ('X', 36, struct ocfs2_space_resv)
53#define OCFS2_IOC_FREESP64 _IOW ('X', 37, struct ocfs2_space_resv)
54#define OCFS2_IOC_RESVSP64 _IOW ('X', 42, struct ocfs2_space_resv)
55#define OCFS2_IOC_UNRESVSP64 _IOW ('X', 43, struct ocfs2_space_resv)
56
57/* Used to pass group descriptor data when online resize is done */
58struct ocfs2_new_group_input {
59    __u64 group; /* Group descriptor's blkno. */
60    __u32 clusters; /* Total number of clusters in this group */
61    __u32 frees; /* Total free clusters in this group */
62    __u16 chain; /* Chain for this group */
63    __u16 reserved1;
64    __u32 reserved2;
65};
66
67#define OCFS2_IOC_GROUP_EXTEND _IOW('o', 1, int)
68#define OCFS2_IOC_GROUP_ADD _IOW('o', 2,struct ocfs2_new_group_input)
69#define OCFS2_IOC_GROUP_ADD64 _IOW('o', 3,struct ocfs2_new_group_input)
70
71/* Used to pass 2 file names to reflink. */
72struct reflink_arguments {
73    __u64 old_path;
74    __u64 new_path;
75    __u64 preserve;
76};
77#define OCFS2_IOC_REFLINK _IOW('o', 4, struct reflink_arguments)
78
79/* Following definitions dedicated for ocfs2_info_request ioctls. */
80#define OCFS2_INFO_MAX_REQUEST (50)
81#define OCFS2_TEXT_UUID_LEN (OCFS2_VOL_UUID_LEN * 2)
82
83/* Magic number of all requests */
84#define OCFS2_INFO_MAGIC (0x4F32494E)
85
86/*
87 * Always try to separate info request into small pieces to
88 * guarantee the backward&forward compatibility.
89 */
90struct ocfs2_info {
91    __u64 oi_requests; /* Array of __u64 pointers to requests */
92    __u32 oi_count; /* Number of requests in info_requests */
93    __u32 oi_pad;
94};
95
96struct ocfs2_info_request {
97/*00*/ __u32 ir_magic; /* Magic number */
98    __u32 ir_code; /* Info request code */
99    __u32 ir_size; /* Size of request */
100    __u32 ir_flags; /* Request flags */
101/*10*/ /* Request specific fields */
102};
103
104struct ocfs2_info_clustersize {
105    struct ocfs2_info_request ic_req;
106    __u32 ic_clustersize;
107    __u32 ic_pad;
108};
109
110struct ocfs2_info_blocksize {
111    struct ocfs2_info_request ib_req;
112    __u32 ib_blocksize;
113    __u32 ib_pad;
114};
115
116struct ocfs2_info_maxslots {
117    struct ocfs2_info_request im_req;
118    __u32 im_max_slots;
119    __u32 im_pad;
120};
121
122struct ocfs2_info_label {
123    struct ocfs2_info_request il_req;
124    __u8 il_label[OCFS2_MAX_VOL_LABEL_LEN];
125} __attribute__ ((packed));
126
127struct ocfs2_info_uuid {
128    struct ocfs2_info_request iu_req;
129    __u8 iu_uuid_str[OCFS2_TEXT_UUID_LEN + 1];
130} __attribute__ ((packed));
131
132struct ocfs2_info_fs_features {
133    struct ocfs2_info_request if_req;
134    __u32 if_compat_features;
135    __u32 if_incompat_features;
136    __u32 if_ro_compat_features;
137    __u32 if_pad;
138};
139
140struct ocfs2_info_journal_size {
141    struct ocfs2_info_request ij_req;
142    __u64 ij_journal_size;
143};
144
145struct ocfs2_info_freeinode {
146    struct ocfs2_info_request ifi_req;
147    struct ocfs2_info_local_freeinode {
148        __u64 lfi_total;
149        __u64 lfi_free;
150    } ifi_stat[OCFS2_MAX_SLOTS];
151    __u32 ifi_slotnum; /* out */
152    __u32 ifi_pad;
153};
154
155#define OCFS2_INFO_MAX_HIST (32)
156
157struct ocfs2_info_freefrag {
158    struct ocfs2_info_request iff_req;
159    struct ocfs2_info_freefrag_stats { /* (out) */
160        struct ocfs2_info_free_chunk_list {
161            __u32 fc_chunks[OCFS2_INFO_MAX_HIST];
162            __u32 fc_clusters[OCFS2_INFO_MAX_HIST];
163        } ffs_fc_hist;
164        __u32 ffs_clusters;
165        __u32 ffs_free_clusters;
166        __u32 ffs_free_chunks;
167        __u32 ffs_free_chunks_real;
168        __u32 ffs_min; /* Minimum free chunksize in clusters */
169        __u32 ffs_max;
170        __u32 ffs_avg;
171        __u32 ffs_pad;
172    } iff_ffs;
173    __u32 iff_chunksize; /* chunksize in clusters(in) */
174    __u32 iff_pad;
175};
176
177/* Codes for ocfs2_info_request */
178enum ocfs2_info_type {
179    OCFS2_INFO_CLUSTERSIZE = 1,
180    OCFS2_INFO_BLOCKSIZE,
181    OCFS2_INFO_MAXSLOTS,
182    OCFS2_INFO_LABEL,
183    OCFS2_INFO_UUID,
184    OCFS2_INFO_FS_FEATURES,
185    OCFS2_INFO_JOURNAL_SIZE,
186    OCFS2_INFO_FREEINODE,
187    OCFS2_INFO_FREEFRAG,
188    OCFS2_INFO_NUM_TYPES
189};
190
191/* Flags for struct ocfs2_info_request */
192/* Filled by the caller */
193#define OCFS2_INFO_FL_NON_COHERENT (0x00000001) /* Cluster coherency not
194                               required. This is a hint.
195                               It is up to ocfs2 whether
196                               the request can be fulfilled
197                               without locking. */
198/* Filled by ocfs2 */
199#define OCFS2_INFO_FL_FILLED (0x40000000) /* Filesystem understood
200                               this request and
201                               filled in the answer */
202
203#define OCFS2_INFO_FL_ERROR (0x80000000) /* Error happened during
204                               request handling. */
205
206#define OCFS2_IOC_INFO _IOR('o', 5, struct ocfs2_info)
207
208struct ocfs2_move_extents {
209/* All values are in bytes */
210    /* in */
211    __u64 me_start; /* Virtual start in the file to move */
212    __u64 me_len; /* Length of the extents to be moved */
213    __u64 me_goal; /* Physical offset of the goal,
214                   it's in block unit */
215    __u64 me_threshold; /* Maximum distance from goal or threshold
216                   for auto defragmentation */
217    __u64 me_flags; /* Flags for the operation:
218                 * - auto defragmentation.
219                 * - refcount,xattr cases.
220                 */
221    /* out */
222    __u64 me_moved_len; /* Moved/defraged length */
223    __u64 me_new_offset; /* Resulting physical location */
224    __u32 me_reserved[2]; /* Reserved for futhure */
225};
226
227#define OCFS2_MOVE_EXT_FL_AUTO_DEFRAG (0x00000001) /* Kernel manages to
228                               claim new clusters
229                               as the goal place
230                               for extents moving */
231#define OCFS2_MOVE_EXT_FL_PART_DEFRAG (0x00000002) /* Allow partial extent
232                               moving, is to make
233                               movement less likely
234                               to fail, may make fs
235                               even more fragmented */
236#define OCFS2_MOVE_EXT_FL_COMPLETE (0x00000004) /* Move or defragmenation
237                               completely gets done.
238                             */
239
240#define OCFS2_IOC_MOVE_EXT _IOW('o', 6, struct ocfs2_move_extents)
241
242#endif /* OCFS2_IOCTL_H */
243

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