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  */
38 struct 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 */
58 struct 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. */
72 struct 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  */
90 struct 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 
96 struct 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 
104 struct ocfs2_info_clustersize {
105 	struct ocfs2_info_request ic_req;
106 	__u32 ic_clustersize;
107 	__u32 ic_pad;
108 };
109 
110 struct ocfs2_info_blocksize {
111 	struct ocfs2_info_request ib_req;
112 	__u32 ib_blocksize;
113 	__u32 ib_pad;
114 };
115 
116 struct ocfs2_info_maxslots {
117 	struct ocfs2_info_request im_req;
118 	__u32 im_max_slots;
119 	__u32 im_pad;
120 };
121 
122 struct ocfs2_info_label {
123 	struct ocfs2_info_request il_req;
124 	__u8	il_label[OCFS2_MAX_VOL_LABEL_LEN];
125 } __attribute__ ((packed));
126 
127 struct ocfs2_info_uuid {
128 	struct ocfs2_info_request iu_req;
129 	__u8	iu_uuid_str[OCFS2_TEXT_UUID_LEN + 1];
130 } __attribute__ ((packed));
131 
132 struct 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 
140 struct ocfs2_info_journal_size {
141 	struct ocfs2_info_request ij_req;
142 	__u64 ij_journal_size;
143 };
144 
145 struct 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 
157 struct 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 */
178 enum 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 
208 struct 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