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Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
2 * Copyright (C) 2001 - 2003 Sistina Software (UK) Limited.
Mike Snitzer1d0f3ce2009-12-10 23:52:22 +00003 * Copyright (C) 2004 - 2009 Red Hat, Inc. All rights reserved.
Linus Torvalds1da177e2005-04-16 15:20:36 -07004 *
5 * This file is released under the LGPL.
6 */
7
8#ifndef _LINUX_DM_IOCTL_V4_H
9#define _LINUX_DM_IOCTL_V4_H
10
11#include <linux/types.h>
12
13#define DM_DIR "mapper" /* Slashes not supported */
14#define DM_MAX_TYPE_NAME 16
15#define DM_NAME_LEN 128
16#define DM_UUID_LEN 129
17
18/*
19 * A traditional ioctl interface for the device mapper.
20 *
21 * Each device can have two tables associated with it, an
22 * 'active' table which is the one currently used by io passing
23 * through the device, and an 'inactive' one which is a table
24 * that is being prepared as a replacement for the 'active' one.
25 *
26 * DM_VERSION:
27 * Just get the version information for the ioctl interface.
28 *
29 * DM_REMOVE_ALL:
30 * Remove all dm devices, destroy all tables. Only really used
31 * for debug.
32 *
33 * DM_LIST_DEVICES:
34 * Get a list of all the dm device names.
35 *
36 * DM_DEV_CREATE:
37 * Create a new device, neither the 'active' or 'inactive' table
38 * slots will be filled. The device will be in suspended state
39 * after creation, however any io to the device will get errored
40 * since it will be out-of-bounds.
41 *
42 * DM_DEV_REMOVE:
43 * Remove a device, destroy any tables.
44 *
45 * DM_DEV_RENAME:
46 * Rename a device.
47 *
48 * DM_SUSPEND:
49 * This performs both suspend and resume, depending which flag is
50 * passed in.
51 * Suspend: This command will not return until all pending io to
52 * the device has completed. Further io will be deferred until
53 * the device is resumed.
54 * Resume: It is no longer an error to issue this command on an
55 * unsuspended device. If a table is present in the 'inactive'
56 * slot, it will be moved to the active slot, then the old table
57 * from the active slot will be _destroyed_. Finally the device
58 * is resumed.
59 *
60 * DM_DEV_STATUS:
61 * Retrieves the status for the table in the 'active' slot.
62 *
63 * DM_DEV_WAIT:
64 * Wait for a significant event to occur to the device. This
65 * could either be caused by an event triggered by one of the
66 * targets of the table in the 'active' slot, or a table change.
67 *
68 * DM_TABLE_LOAD:
69 * Load a table into the 'inactive' slot for the device. The
70 * device does _not_ need to be suspended prior to this command.
71 *
72 * DM_TABLE_CLEAR:
73 * Destroy any table in the 'inactive' slot (ie. abort).
74 *
75 * DM_TABLE_DEPS:
76 * Return a set of device dependencies for the 'active' table.
77 *
78 * DM_TABLE_STATUS:
79 * Return the targets status for the 'active' table.
80 *
81 * DM_TARGET_MSG:
82 * Pass a message string to the target at a specific offset of a device.
Darrick J. Wong3ac51e72006-03-27 01:17:54 -080083 *
84 * DM_DEV_SET_GEOMETRY:
85 * Set the geometry of a device by passing in a string in this format:
86 *
87 * "cylinders heads sectors_per_track start_sector"
88 *
89 * Beware that CHS geometry is nearly obsolete and only provided
90 * for compatibility with dm devices that can be booted by a PC
91 * BIOS. See struct hd_geometry for range limits. Also note that
92 * the geometry is erased if the device size changes.
Linus Torvalds1da177e2005-04-16 15:20:36 -070093 */
94
95/*
96 * All ioctl arguments consist of a single chunk of memory, with
97 * this structure at the start. If a uuid is specified any
98 * lookup (eg. for a DM_INFO) will be done on that, *not* the
99 * name.
100 */
101struct dm_ioctl {
102 /*
103 * The version number is made up of three parts:
104 * major - no backward or forward compatibility,
105 * minor - only backwards compatible,
106 * patch - both backwards and forwards compatible.
107 *
108 * All clients of the ioctl interface should fill in the
109 * version number of the interface that they were
110 * compiled with.
111 *
112 * All recognised ioctl commands (ie. those that don't
113 * return -ENOTTY) fill out this field, even if the
114 * command failed.
115 */
Arnd Bergmann9adfbfb2009-02-26 00:51:40 +0100116 __u32 version[3]; /* in/out */
117 __u32 data_size; /* total size of data passed in
Linus Torvalds1da177e2005-04-16 15:20:36 -0700118 * including this struct */
119
Arnd Bergmann9adfbfb2009-02-26 00:51:40 +0100120 __u32 data_start; /* offset to start of data
Linus Torvalds1da177e2005-04-16 15:20:36 -0700121 * relative to start of this struct */
122
Arnd Bergmann9adfbfb2009-02-26 00:51:40 +0100123 __u32 target_count; /* in/out */
124 __s32 open_count; /* out */
125 __u32 flags; /* in/out */
Milan Broz60935eb2009-06-22 10:12:30 +0100126
127 /*
128 * event_nr holds either the event number (input and output) or the
129 * udev cookie value (input only).
130 * The DM_DEV_WAIT ioctl takes an event number as input.
131 * The DM_SUSPEND, DM_DEV_REMOVE and DM_DEV_RENAME ioctls
132 * use the field as a cookie to return in the DM_COOKIE
133 * variable with the uevents they issue.
134 * For output, the ioctls return the event number, not the cookie.
135 */
Arnd Bergmann9adfbfb2009-02-26 00:51:40 +0100136 __u32 event_nr; /* in/out */
137 __u32 padding;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700138
Arnd Bergmann9adfbfb2009-02-26 00:51:40 +0100139 __u64 dev; /* in/out */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700140
141 char name[DM_NAME_LEN]; /* device name */
142 char uuid[DM_UUID_LEN]; /* unique identifier for
143 * the block device */
Milan Broz027d50f2007-10-19 22:38:36 +0100144 char data[7]; /* padding or data */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700145};
146
147/*
148 * Used to specify tables. These structures appear after the
149 * dm_ioctl.
150 */
151struct dm_target_spec {
Arnd Bergmann9adfbfb2009-02-26 00:51:40 +0100152 __u64 sector_start;
153 __u64 length;
154 __s32 status; /* used when reading from kernel only */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700155
156 /*
157 * Location of the next dm_target_spec.
158 * - When specifying targets on a DM_TABLE_LOAD command, this value is
159 * the number of bytes from the start of the "current" dm_target_spec
160 * to the start of the "next" dm_target_spec.
161 * - When retrieving targets on a DM_TABLE_STATUS command, this value
162 * is the number of bytes from the start of the first dm_target_spec
163 * (that follows the dm_ioctl struct) to the start of the "next"
164 * dm_target_spec.
165 */
Arnd Bergmann9adfbfb2009-02-26 00:51:40 +0100166 __u32 next;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700167
168 char target_type[DM_MAX_TYPE_NAME];
169
170 /*
171 * Parameter string starts immediately after this object.
172 * Be careful to add padding after string to ensure correct
173 * alignment of subsequent dm_target_spec.
174 */
175};
176
177/*
178 * Used to retrieve the target dependencies.
179 */
180struct dm_target_deps {
Arnd Bergmann9adfbfb2009-02-26 00:51:40 +0100181 __u32 count; /* Array size */
182 __u32 padding; /* unused */
183 __u64 dev[0]; /* out */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700184};
185
186/*
187 * Used to get a list of all dm devices.
188 */
189struct dm_name_list {
Arnd Bergmann9adfbfb2009-02-26 00:51:40 +0100190 __u64 dev;
191 __u32 next; /* offset to the next record from
Linus Torvalds1da177e2005-04-16 15:20:36 -0700192 the _start_ of this */
193 char name[0];
194};
195
196/*
197 * Used to retrieve the target versions
198 */
199struct dm_target_versions {
Arnd Bergmann9adfbfb2009-02-26 00:51:40 +0100200 __u32 next;
201 __u32 version[3];
Linus Torvalds1da177e2005-04-16 15:20:36 -0700202
203 char name[0];
204};
205
206/*
207 * Used to pass message to a target
208 */
209struct dm_target_msg {
Arnd Bergmann9adfbfb2009-02-26 00:51:40 +0100210 __u64 sector; /* Device sector */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700211
212 char message[0];
213};
214
215/*
216 * If you change this make sure you make the corresponding change
217 * to dm-ioctl.c:lookup_ioctl()
218 */
219enum {
220 /* Top level cmds */
221 DM_VERSION_CMD = 0,
222 DM_REMOVE_ALL_CMD,
223 DM_LIST_DEVICES_CMD,
224
225 /* device level cmds */
226 DM_DEV_CREATE_CMD,
227 DM_DEV_REMOVE_CMD,
228 DM_DEV_RENAME_CMD,
229 DM_DEV_SUSPEND_CMD,
230 DM_DEV_STATUS_CMD,
231 DM_DEV_WAIT_CMD,
232
233 /* Table level cmds */
234 DM_TABLE_LOAD_CMD,
235 DM_TABLE_CLEAR_CMD,
236 DM_TABLE_DEPS_CMD,
237 DM_TABLE_STATUS_CMD,
238
239 /* Added later */
240 DM_LIST_VERSIONS_CMD,
241 DM_TARGET_MSG_CMD,
Darrick J. Wong3ac51e72006-03-27 01:17:54 -0800242 DM_DEV_SET_GEOMETRY_CMD
Linus Torvalds1da177e2005-04-16 15:20:36 -0700243};
244
Linus Torvalds1da177e2005-04-16 15:20:36 -0700245#define DM_IOCTL 0xfd
246
247#define DM_VERSION _IOWR(DM_IOCTL, DM_VERSION_CMD, struct dm_ioctl)
248#define DM_REMOVE_ALL _IOWR(DM_IOCTL, DM_REMOVE_ALL_CMD, struct dm_ioctl)
249#define DM_LIST_DEVICES _IOWR(DM_IOCTL, DM_LIST_DEVICES_CMD, struct dm_ioctl)
250
251#define DM_DEV_CREATE _IOWR(DM_IOCTL, DM_DEV_CREATE_CMD, struct dm_ioctl)
252#define DM_DEV_REMOVE _IOWR(DM_IOCTL, DM_DEV_REMOVE_CMD, struct dm_ioctl)
253#define DM_DEV_RENAME _IOWR(DM_IOCTL, DM_DEV_RENAME_CMD, struct dm_ioctl)
254#define DM_DEV_SUSPEND _IOWR(DM_IOCTL, DM_DEV_SUSPEND_CMD, struct dm_ioctl)
255#define DM_DEV_STATUS _IOWR(DM_IOCTL, DM_DEV_STATUS_CMD, struct dm_ioctl)
256#define DM_DEV_WAIT _IOWR(DM_IOCTL, DM_DEV_WAIT_CMD, struct dm_ioctl)
257
258#define DM_TABLE_LOAD _IOWR(DM_IOCTL, DM_TABLE_LOAD_CMD, struct dm_ioctl)
259#define DM_TABLE_CLEAR _IOWR(DM_IOCTL, DM_TABLE_CLEAR_CMD, struct dm_ioctl)
260#define DM_TABLE_DEPS _IOWR(DM_IOCTL, DM_TABLE_DEPS_CMD, struct dm_ioctl)
261#define DM_TABLE_STATUS _IOWR(DM_IOCTL, DM_TABLE_STATUS_CMD, struct dm_ioctl)
262
263#define DM_LIST_VERSIONS _IOWR(DM_IOCTL, DM_LIST_VERSIONS_CMD, struct dm_ioctl)
264
265#define DM_TARGET_MSG _IOWR(DM_IOCTL, DM_TARGET_MSG_CMD, struct dm_ioctl)
Darrick J. Wong3ac51e72006-03-27 01:17:54 -0800266#define DM_DEV_SET_GEOMETRY _IOWR(DM_IOCTL, DM_DEV_SET_GEOMETRY_CMD, struct dm_ioctl)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700267
268#define DM_VERSION_MAJOR 4
Mike Snitzer1d0f3ce2009-12-10 23:52:22 +0000269#define DM_VERSION_MINOR 16
Linus Torvalds1da177e2005-04-16 15:20:36 -0700270#define DM_VERSION_PATCHLEVEL 0
Mike Snitzer1d0f3ce2009-12-10 23:52:22 +0000271#define DM_VERSION_EXTRA "-ioctl (2009-11-05)"
Linus Torvalds1da177e2005-04-16 15:20:36 -0700272
273/* Status bits */
274#define DM_READONLY_FLAG (1 << 0) /* In/Out */
275#define DM_SUSPEND_FLAG (1 << 1) /* In/Out */
276#define DM_PERSISTENT_DEV_FLAG (1 << 3) /* In */
277
278/*
279 * Flag passed into ioctl STATUS command to get table information
280 * rather than current status.
281 */
282#define DM_STATUS_TABLE_FLAG (1 << 4) /* In */
283
284/*
285 * Flags that indicate whether a table is present in either of
286 * the two table slots that a device has.
287 */
288#define DM_ACTIVE_PRESENT_FLAG (1 << 5) /* Out */
289#define DM_INACTIVE_PRESENT_FLAG (1 << 6) /* Out */
290
291/*
292 * Indicates that the buffer passed in wasn't big enough for the
293 * results.
294 */
295#define DM_BUFFER_FULL_FLAG (1 << 8) /* Out */
296
297/*
Alasdair G Kergon5c6bd752006-06-26 00:27:34 -0700298 * This flag is now ignored.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700299 */
300#define DM_SKIP_BDGET_FLAG (1 << 9) /* In */
301
Alasdair G Kergon6da487d2006-01-06 00:20:07 -0800302/*
303 * Set this to avoid attempting to freeze any filesystem when suspending.
304 */
305#define DM_SKIP_LOCKFS_FLAG (1 << 10) /* In */
306
Kiyoshi Ueda81fdb092006-12-08 02:41:07 -0800307/*
308 * Set this to suspend without flushing queued ios.
309 */
310#define DM_NOFLUSH_FLAG (1 << 11) /* In */
311
Mike Snitzer1d0f3ce2009-12-10 23:52:22 +0000312/*
313 * If set, any table information returned will relate to the inactive
314 * table instead of the live one. Always check DM_INACTIVE_PRESENT_FLAG
315 * is set before using the data returned.
316 */
317#define DM_QUERY_INACTIVE_TABLE_FLAG (1 << 12) /* In */
318
Linus Torvalds1da177e2005-04-16 15:20:36 -0700319#endif /* _LINUX_DM_IOCTL_H */