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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 */
Peter Rajnoha7e507eb2010-08-12 04:14:05 +010014#define DM_CONTROL_NODE "control"
Linus Torvalds1da177e2005-04-16 15:20:36 -070015#define DM_MAX_TYPE_NAME 16
16#define DM_NAME_LEN 128
17#define DM_UUID_LEN 129
18
19/*
20 * A traditional ioctl interface for the device mapper.
21 *
22 * Each device can have two tables associated with it, an
23 * 'active' table which is the one currently used by io passing
24 * through the device, and an 'inactive' one which is a table
25 * that is being prepared as a replacement for the 'active' one.
26 *
27 * DM_VERSION:
28 * Just get the version information for the ioctl interface.
29 *
30 * DM_REMOVE_ALL:
31 * Remove all dm devices, destroy all tables. Only really used
32 * for debug.
33 *
34 * DM_LIST_DEVICES:
35 * Get a list of all the dm device names.
36 *
37 * DM_DEV_CREATE:
38 * Create a new device, neither the 'active' or 'inactive' table
39 * slots will be filled. The device will be in suspended state
40 * after creation, however any io to the device will get errored
41 * since it will be out-of-bounds.
42 *
43 * DM_DEV_REMOVE:
44 * Remove a device, destroy any tables.
45 *
46 * DM_DEV_RENAME:
47 * Rename a device.
48 *
49 * DM_SUSPEND:
50 * This performs both suspend and resume, depending which flag is
51 * passed in.
52 * Suspend: This command will not return until all pending io to
53 * the device has completed. Further io will be deferred until
54 * the device is resumed.
55 * Resume: It is no longer an error to issue this command on an
56 * unsuspended device. If a table is present in the 'inactive'
57 * slot, it will be moved to the active slot, then the old table
58 * from the active slot will be _destroyed_. Finally the device
59 * is resumed.
60 *
61 * DM_DEV_STATUS:
62 * Retrieves the status for the table in the 'active' slot.
63 *
64 * DM_DEV_WAIT:
65 * Wait for a significant event to occur to the device. This
66 * could either be caused by an event triggered by one of the
67 * targets of the table in the 'active' slot, or a table change.
68 *
69 * DM_TABLE_LOAD:
70 * Load a table into the 'inactive' slot for the device. The
71 * device does _not_ need to be suspended prior to this command.
72 *
73 * DM_TABLE_CLEAR:
74 * Destroy any table in the 'inactive' slot (ie. abort).
75 *
76 * DM_TABLE_DEPS:
77 * Return a set of device dependencies for the 'active' table.
78 *
79 * DM_TABLE_STATUS:
80 * Return the targets status for the 'active' table.
81 *
82 * DM_TARGET_MSG:
83 * Pass a message string to the target at a specific offset of a device.
Darrick J. Wong3ac51e72006-03-27 01:17:54 -080084 *
85 * DM_DEV_SET_GEOMETRY:
86 * Set the geometry of a device by passing in a string in this format:
87 *
88 * "cylinders heads sectors_per_track start_sector"
89 *
90 * Beware that CHS geometry is nearly obsolete and only provided
91 * for compatibility with dm devices that can be booted by a PC
92 * BIOS. See struct hd_geometry for range limits. Also note that
93 * the geometry is erased if the device size changes.
Linus Torvalds1da177e2005-04-16 15:20:36 -070094 */
95
96/*
97 * All ioctl arguments consist of a single chunk of memory, with
98 * this structure at the start. If a uuid is specified any
99 * lookup (eg. for a DM_INFO) will be done on that, *not* the
100 * name.
101 */
102struct dm_ioctl {
103 /*
104 * The version number is made up of three parts:
105 * major - no backward or forward compatibility,
106 * minor - only backwards compatible,
107 * patch - both backwards and forwards compatible.
108 *
109 * All clients of the ioctl interface should fill in the
110 * version number of the interface that they were
111 * compiled with.
112 *
113 * All recognised ioctl commands (ie. those that don't
114 * return -ENOTTY) fill out this field, even if the
115 * command failed.
116 */
Arnd Bergmann9adfbfb2009-02-26 00:51:40 +0100117 __u32 version[3]; /* in/out */
118 __u32 data_size; /* total size of data passed in
Linus Torvalds1da177e2005-04-16 15:20:36 -0700119 * including this struct */
120
Arnd Bergmann9adfbfb2009-02-26 00:51:40 +0100121 __u32 data_start; /* offset to start of data
Linus Torvalds1da177e2005-04-16 15:20:36 -0700122 * relative to start of this struct */
123
Arnd Bergmann9adfbfb2009-02-26 00:51:40 +0100124 __u32 target_count; /* in/out */
125 __s32 open_count; /* out */
126 __u32 flags; /* in/out */
Milan Broz60935eb2009-06-22 10:12:30 +0100127
128 /*
129 * event_nr holds either the event number (input and output) or the
130 * udev cookie value (input only).
131 * The DM_DEV_WAIT ioctl takes an event number as input.
132 * The DM_SUSPEND, DM_DEV_REMOVE and DM_DEV_RENAME ioctls
133 * use the field as a cookie to return in the DM_COOKIE
134 * variable with the uevents they issue.
135 * For output, the ioctls return the event number, not the cookie.
136 */
Arnd Bergmann9adfbfb2009-02-26 00:51:40 +0100137 __u32 event_nr; /* in/out */
138 __u32 padding;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700139
Arnd Bergmann9adfbfb2009-02-26 00:51:40 +0100140 __u64 dev; /* in/out */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700141
142 char name[DM_NAME_LEN]; /* device name */
143 char uuid[DM_UUID_LEN]; /* unique identifier for
144 * the block device */
Milan Broz027d50f2007-10-19 22:38:36 +0100145 char data[7]; /* padding or data */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700146};
147
148/*
149 * Used to specify tables. These structures appear after the
150 * dm_ioctl.
151 */
152struct dm_target_spec {
Arnd Bergmann9adfbfb2009-02-26 00:51:40 +0100153 __u64 sector_start;
154 __u64 length;
155 __s32 status; /* used when reading from kernel only */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700156
157 /*
158 * Location of the next dm_target_spec.
159 * - When specifying targets on a DM_TABLE_LOAD command, this value is
160 * the number of bytes from the start of the "current" dm_target_spec
161 * to the start of the "next" dm_target_spec.
162 * - When retrieving targets on a DM_TABLE_STATUS command, this value
163 * is the number of bytes from the start of the first dm_target_spec
164 * (that follows the dm_ioctl struct) to the start of the "next"
165 * dm_target_spec.
166 */
Arnd Bergmann9adfbfb2009-02-26 00:51:40 +0100167 __u32 next;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700168
169 char target_type[DM_MAX_TYPE_NAME];
170
171 /*
172 * Parameter string starts immediately after this object.
173 * Be careful to add padding after string to ensure correct
174 * alignment of subsequent dm_target_spec.
175 */
176};
177
178/*
179 * Used to retrieve the target dependencies.
180 */
181struct dm_target_deps {
Arnd Bergmann9adfbfb2009-02-26 00:51:40 +0100182 __u32 count; /* Array size */
183 __u32 padding; /* unused */
184 __u64 dev[0]; /* out */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700185};
186
187/*
188 * Used to get a list of all dm devices.
189 */
190struct dm_name_list {
Arnd Bergmann9adfbfb2009-02-26 00:51:40 +0100191 __u64 dev;
192 __u32 next; /* offset to the next record from
Linus Torvalds1da177e2005-04-16 15:20:36 -0700193 the _start_ of this */
194 char name[0];
195};
196
197/*
198 * Used to retrieve the target versions
199 */
200struct dm_target_versions {
Arnd Bergmann9adfbfb2009-02-26 00:51:40 +0100201 __u32 next;
202 __u32 version[3];
Linus Torvalds1da177e2005-04-16 15:20:36 -0700203
204 char name[0];
205};
206
207/*
208 * Used to pass message to a target
209 */
210struct dm_target_msg {
Arnd Bergmann9adfbfb2009-02-26 00:51:40 +0100211 __u64 sector; /* Device sector */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700212
213 char message[0];
214};
215
216/*
217 * If you change this make sure you make the corresponding change
218 * to dm-ioctl.c:lookup_ioctl()
219 */
220enum {
221 /* Top level cmds */
222 DM_VERSION_CMD = 0,
223 DM_REMOVE_ALL_CMD,
224 DM_LIST_DEVICES_CMD,
225
226 /* device level cmds */
227 DM_DEV_CREATE_CMD,
228 DM_DEV_REMOVE_CMD,
229 DM_DEV_RENAME_CMD,
230 DM_DEV_SUSPEND_CMD,
231 DM_DEV_STATUS_CMD,
232 DM_DEV_WAIT_CMD,
233
234 /* Table level cmds */
235 DM_TABLE_LOAD_CMD,
236 DM_TABLE_CLEAR_CMD,
237 DM_TABLE_DEPS_CMD,
238 DM_TABLE_STATUS_CMD,
239
240 /* Added later */
241 DM_LIST_VERSIONS_CMD,
242 DM_TARGET_MSG_CMD,
Darrick J. Wong3ac51e72006-03-27 01:17:54 -0800243 DM_DEV_SET_GEOMETRY_CMD
Linus Torvalds1da177e2005-04-16 15:20:36 -0700244};
245
Linus Torvalds1da177e2005-04-16 15:20:36 -0700246#define DM_IOCTL 0xfd
247
248#define DM_VERSION _IOWR(DM_IOCTL, DM_VERSION_CMD, struct dm_ioctl)
249#define DM_REMOVE_ALL _IOWR(DM_IOCTL, DM_REMOVE_ALL_CMD, struct dm_ioctl)
250#define DM_LIST_DEVICES _IOWR(DM_IOCTL, DM_LIST_DEVICES_CMD, struct dm_ioctl)
251
252#define DM_DEV_CREATE _IOWR(DM_IOCTL, DM_DEV_CREATE_CMD, struct dm_ioctl)
253#define DM_DEV_REMOVE _IOWR(DM_IOCTL, DM_DEV_REMOVE_CMD, struct dm_ioctl)
254#define DM_DEV_RENAME _IOWR(DM_IOCTL, DM_DEV_RENAME_CMD, struct dm_ioctl)
255#define DM_DEV_SUSPEND _IOWR(DM_IOCTL, DM_DEV_SUSPEND_CMD, struct dm_ioctl)
256#define DM_DEV_STATUS _IOWR(DM_IOCTL, DM_DEV_STATUS_CMD, struct dm_ioctl)
257#define DM_DEV_WAIT _IOWR(DM_IOCTL, DM_DEV_WAIT_CMD, struct dm_ioctl)
258
259#define DM_TABLE_LOAD _IOWR(DM_IOCTL, DM_TABLE_LOAD_CMD, struct dm_ioctl)
260#define DM_TABLE_CLEAR _IOWR(DM_IOCTL, DM_TABLE_CLEAR_CMD, struct dm_ioctl)
261#define DM_TABLE_DEPS _IOWR(DM_IOCTL, DM_TABLE_DEPS_CMD, struct dm_ioctl)
262#define DM_TABLE_STATUS _IOWR(DM_IOCTL, DM_TABLE_STATUS_CMD, struct dm_ioctl)
263
264#define DM_LIST_VERSIONS _IOWR(DM_IOCTL, DM_LIST_VERSIONS_CMD, struct dm_ioctl)
265
266#define DM_TARGET_MSG _IOWR(DM_IOCTL, DM_TARGET_MSG_CMD, struct dm_ioctl)
Darrick J. Wong3ac51e72006-03-27 01:17:54 -0800267#define DM_DEV_SET_GEOMETRY _IOWR(DM_IOCTL, DM_DEV_SET_GEOMETRY_CMD, struct dm_ioctl)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700268
269#define DM_VERSION_MAJOR 4
Mike Snitzera5664da2010-08-12 04:14:01 +0100270#define DM_VERSION_MINOR 18
Linus Torvalds1da177e2005-04-16 15:20:36 -0700271#define DM_VERSION_PATCHLEVEL 0
Mike Snitzera5664da2010-08-12 04:14:01 +0100272#define DM_VERSION_EXTRA "-ioctl (2010-06-29)"
Linus Torvalds1da177e2005-04-16 15:20:36 -0700273
274/* Status bits */
275#define DM_READONLY_FLAG (1 << 0) /* In/Out */
276#define DM_SUSPEND_FLAG (1 << 1) /* In/Out */
277#define DM_PERSISTENT_DEV_FLAG (1 << 3) /* In */
278
279/*
280 * Flag passed into ioctl STATUS command to get table information
281 * rather than current status.
282 */
283#define DM_STATUS_TABLE_FLAG (1 << 4) /* In */
284
285/*
286 * Flags that indicate whether a table is present in either of
287 * the two table slots that a device has.
288 */
289#define DM_ACTIVE_PRESENT_FLAG (1 << 5) /* Out */
290#define DM_INACTIVE_PRESENT_FLAG (1 << 6) /* Out */
291
292/*
293 * Indicates that the buffer passed in wasn't big enough for the
294 * results.
295 */
296#define DM_BUFFER_FULL_FLAG (1 << 8) /* Out */
297
298/*
Alasdair G Kergon5c6bd752006-06-26 00:27:34 -0700299 * This flag is now ignored.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700300 */
301#define DM_SKIP_BDGET_FLAG (1 << 9) /* In */
302
Alasdair G Kergon6da487d2006-01-06 00:20:07 -0800303/*
304 * Set this to avoid attempting to freeze any filesystem when suspending.
305 */
306#define DM_SKIP_LOCKFS_FLAG (1 << 10) /* In */
307
Kiyoshi Ueda81fdb092006-12-08 02:41:07 -0800308/*
309 * Set this to suspend without flushing queued ios.
310 */
311#define DM_NOFLUSH_FLAG (1 << 11) /* In */
312
Mike Snitzer1d0f3ce2009-12-10 23:52:22 +0000313/*
314 * If set, any table information returned will relate to the inactive
315 * table instead of the live one. Always check DM_INACTIVE_PRESENT_FLAG
316 * is set before using the data returned.
317 */
318#define DM_QUERY_INACTIVE_TABLE_FLAG (1 << 12) /* In */
319
Peter Rajnoha3abf85b2010-03-06 02:32:31 +0000320/*
321 * If set, a uevent was generated for which the caller may need to wait.
322 */
323#define DM_UEVENT_GENERATED_FLAG (1 << 13) /* Out */
324
Linus Torvalds1da177e2005-04-16 15:20:36 -0700325#endif /* _LINUX_DM_IOCTL_H */