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The device-mapper directory now holds a copy of libdm source. At the moment this code is identical to libdm. Over time code will migrate out to appropriate places (see doc/refactoring.txt). The libdm directory still exists, and contains the source for the libdevmapper shared library, which we will continue to ship (though not neccessarily update). All code using libdm should now use the version in device-mapper.
365 lines
11 KiB
C
365 lines
11 KiB
C
/*
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* Copyright (C) 2001 - 2003 Sistina Software (UK) Limited.
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* Copyright (C) 2004 - 2017 Red Hat, Inc. All rights reserved.
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*
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* This file is released under the LGPL.
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*/
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#ifndef _LINUX_DM_IOCTL_V4_H
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#define _LINUX_DM_IOCTL_V4_H
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#ifdef __linux__
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# include <linux/types.h>
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#endif
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#define DM_DIR "mapper" /* Slashes not supported */
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#define DM_CONTROL_NODE "control"
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#define DM_MAX_TYPE_NAME 16
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#define DM_NAME_LEN 128
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#define DM_UUID_LEN 129
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/*
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* A traditional ioctl interface for the device mapper.
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*
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* Each device can have two tables associated with it, an
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* 'active' table which is the one currently used by io passing
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* through the device, and an 'inactive' one which is a table
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* that is being prepared as a replacement for the 'active' one.
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*
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* DM_VERSION:
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* Just get the version information for the ioctl interface.
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*
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* DM_REMOVE_ALL:
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* Remove all dm devices, destroy all tables. Only really used
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* for debug.
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*
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* DM_LIST_DEVICES:
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* Get a list of all the dm device names.
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*
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* DM_DEV_CREATE:
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* Create a new device, neither the 'active' or 'inactive' table
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* slots will be filled. The device will be in suspended state
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* after creation, however any io to the device will get errored
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* since it will be out-of-bounds.
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*
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* DM_DEV_REMOVE:
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* Remove a device, destroy any tables.
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*
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* DM_DEV_RENAME:
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* Rename a device or set its uuid if none was previously supplied.
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*
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* DM_SUSPEND:
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* This performs both suspend and resume, depending which flag is
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* passed in.
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* Suspend: This command will not return until all pending io to
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* the device has completed. Further io will be deferred until
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* the device is resumed.
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* Resume: It is no longer an error to issue this command on an
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* unsuspended device. If a table is present in the 'inactive'
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* slot, it will be moved to the active slot, then the old table
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* from the active slot will be _destroyed_. Finally the device
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* is resumed.
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*
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* DM_DEV_STATUS:
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* Retrieves the status for the table in the 'active' slot.
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*
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* DM_DEV_WAIT:
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* Wait for a significant event to occur to the device. This
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* could either be caused by an event triggered by one of the
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* targets of the table in the 'active' slot, or a table change.
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*
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* DM_TABLE_LOAD:
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* Load a table into the 'inactive' slot for the device. The
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* device does _not_ need to be suspended prior to this command.
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*
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* DM_TABLE_CLEAR:
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* Destroy any table in the 'inactive' slot (ie. abort).
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*
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* DM_TABLE_DEPS:
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* Return a set of device dependencies for the 'active' table.
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*
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* DM_TABLE_STATUS:
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* Return the targets status for the 'active' table.
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*
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* DM_TARGET_MSG:
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* Pass a message string to the target at a specific offset of a device.
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*
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* DM_DEV_SET_GEOMETRY:
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* Set the geometry of a device by passing in a string in this format:
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*
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* "cylinders heads sectors_per_track start_sector"
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*
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* Beware that CHS geometry is nearly obsolete and only provided
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* for compatibility with dm devices that can be booted by a PC
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* BIOS. See struct hd_geometry for range limits. Also note that
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* the geometry is erased if the device size changes.
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*/
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/*
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* All ioctl arguments consist of a single chunk of memory, with
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* this structure at the start. If a uuid is specified any
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* lookup (eg. for a DM_INFO) will be done on that, *not* the
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* name.
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*/
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struct dm_ioctl {
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/*
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* The version number is made up of three parts:
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* major - no backward or forward compatibility,
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* minor - only backwards compatible,
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* patch - both backwards and forwards compatible.
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*
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* All clients of the ioctl interface should fill in the
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* version number of the interface that they were
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* compiled with.
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*
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* All recognised ioctl commands (ie. those that don't
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* return -ENOTTY) fill out this field, even if the
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* command failed.
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*/
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uint32_t version[3]; /* in/out */
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uint32_t data_size; /* total size of data passed in
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* including this struct */
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uint32_t data_start; /* offset to start of data
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* relative to start of this struct */
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uint32_t target_count; /* in/out */
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int32_t open_count; /* out */
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uint32_t flags; /* in/out */
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/*
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* event_nr holds either the event number (input and output) or the
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* udev cookie value (input only).
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* The DM_DEV_WAIT ioctl takes an event number as input.
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* The DM_SUSPEND, DM_DEV_REMOVE and DM_DEV_RENAME ioctls
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* use the field as a cookie to return in the DM_COOKIE
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* variable with the uevents they issue.
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* For output, the ioctls return the event number, not the cookie.
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*/
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uint32_t event_nr; /* in/out */
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uint32_t padding;
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uint64_t dev; /* in/out */
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char name[DM_NAME_LEN]; /* device name */
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char uuid[DM_UUID_LEN]; /* unique identifier for
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* the block device */
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char data[7]; /* padding or data */
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};
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/*
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* Used to specify tables. These structures appear after the
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* dm_ioctl.
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*/
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struct dm_target_spec {
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uint64_t sector_start;
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uint64_t length;
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int32_t status; /* used when reading from kernel only */
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/*
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* Location of the next dm_target_spec.
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* - When specifying targets on a DM_TABLE_LOAD command, this value is
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* the number of bytes from the start of the "current" dm_target_spec
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* to the start of the "next" dm_target_spec.
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* - When retrieving targets on a DM_TABLE_STATUS command, this value
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* is the number of bytes from the start of the first dm_target_spec
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* (that follows the dm_ioctl struct) to the start of the "next"
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* dm_target_spec.
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*/
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uint32_t next;
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char target_type[DM_MAX_TYPE_NAME];
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/*
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* Parameter string starts immediately after this object.
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* Be careful to add padding after string to ensure correct
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* alignment of subsequent dm_target_spec.
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*/
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};
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/*
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* Used to retrieve the target dependencies.
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*/
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struct dm_target_deps {
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uint32_t count; /* Array size */
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uint32_t padding; /* unused */
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uint64_t dev[0]; /* out */
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};
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/*
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* Used to get a list of all dm devices.
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*/
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struct dm_name_list {
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uint64_t dev;
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uint32_t next; /* offset to the next record from
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the _start_ of this */
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char name[0];
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};
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/*
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* Used to retrieve the target versions
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*/
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struct dm_target_versions {
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uint32_t next;
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uint32_t version[3];
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char name[0];
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};
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/*
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* Used to pass message to a target
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*/
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struct dm_target_msg {
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uint64_t sector; /* Device sector */
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char message[0];
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};
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/*
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* If you change this make sure you make the corresponding change
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* to dm-ioctl.c:lookup_ioctl()
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*/
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enum {
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/* Top level cmds */
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DM_VERSION_CMD = 0,
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DM_REMOVE_ALL_CMD,
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DM_LIST_DEVICES_CMD,
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/* device level cmds */
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DM_DEV_CREATE_CMD,
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DM_DEV_REMOVE_CMD,
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DM_DEV_RENAME_CMD,
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DM_DEV_SUSPEND_CMD,
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DM_DEV_STATUS_CMD,
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DM_DEV_WAIT_CMD,
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/* Table level cmds */
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DM_TABLE_LOAD_CMD,
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DM_TABLE_CLEAR_CMD,
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DM_TABLE_DEPS_CMD,
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DM_TABLE_STATUS_CMD,
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/* Added later */
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DM_LIST_VERSIONS_CMD,
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DM_TARGET_MSG_CMD,
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DM_DEV_SET_GEOMETRY_CMD,
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DM_DEV_ARM_POLL_CMD,
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};
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#define DM_IOCTL 0xfd
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#define DM_VERSION _IOWR(DM_IOCTL, DM_VERSION_CMD, struct dm_ioctl)
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#define DM_REMOVE_ALL _IOWR(DM_IOCTL, DM_REMOVE_ALL_CMD, struct dm_ioctl)
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#define DM_LIST_DEVICES _IOWR(DM_IOCTL, DM_LIST_DEVICES_CMD, struct dm_ioctl)
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#define DM_DEV_CREATE _IOWR(DM_IOCTL, DM_DEV_CREATE_CMD, struct dm_ioctl)
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#define DM_DEV_REMOVE _IOWR(DM_IOCTL, DM_DEV_REMOVE_CMD, struct dm_ioctl)
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#define DM_DEV_RENAME _IOWR(DM_IOCTL, DM_DEV_RENAME_CMD, struct dm_ioctl)
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#define DM_DEV_SUSPEND _IOWR(DM_IOCTL, DM_DEV_SUSPEND_CMD, struct dm_ioctl)
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#define DM_DEV_STATUS _IOWR(DM_IOCTL, DM_DEV_STATUS_CMD, struct dm_ioctl)
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#define DM_DEV_WAIT _IOWR(DM_IOCTL, DM_DEV_WAIT_CMD, struct dm_ioctl)
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#define DM_DEV_ARM_POLL _IOWR(DM_IOCTL, DM_DEV_ARM_POLL_CMD, struct dm_ioctl)
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#define DM_TABLE_LOAD _IOWR(DM_IOCTL, DM_TABLE_LOAD_CMD, struct dm_ioctl)
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#define DM_TABLE_CLEAR _IOWR(DM_IOCTL, DM_TABLE_CLEAR_CMD, struct dm_ioctl)
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#define DM_TABLE_DEPS _IOWR(DM_IOCTL, DM_TABLE_DEPS_CMD, struct dm_ioctl)
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#define DM_TABLE_STATUS _IOWR(DM_IOCTL, DM_TABLE_STATUS_CMD, struct dm_ioctl)
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#define DM_LIST_VERSIONS _IOWR(DM_IOCTL, DM_LIST_VERSIONS_CMD, struct dm_ioctl)
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#define DM_TARGET_MSG _IOWR(DM_IOCTL, DM_TARGET_MSG_CMD, struct dm_ioctl)
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#define DM_DEV_SET_GEOMETRY _IOWR(DM_IOCTL, DM_DEV_SET_GEOMETRY_CMD, struct dm_ioctl)
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#define DM_VERSION_MAJOR 4
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#define DM_VERSION_MINOR 36
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#define DM_VERSION_PATCHLEVEL 0
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#define DM_VERSION_EXTRA "-ioctl (2017-06-09)"
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/* Status bits */
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#define DM_READONLY_FLAG (1 << 0) /* In/Out */
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#define DM_SUSPEND_FLAG (1 << 1) /* In/Out */
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#define DM_PERSISTENT_DEV_FLAG (1 << 3) /* In */
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/*
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* Flag passed into ioctl STATUS command to get table information
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* rather than current status.
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*/
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#define DM_STATUS_TABLE_FLAG (1 << 4) /* In */
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/*
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* Flags that indicate whether a table is present in either of
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* the two table slots that a device has.
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*/
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#define DM_ACTIVE_PRESENT_FLAG (1 << 5) /* Out */
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#define DM_INACTIVE_PRESENT_FLAG (1 << 6) /* Out */
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/*
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* Indicates that the buffer passed in wasn't big enough for the
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* results.
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*/
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#define DM_BUFFER_FULL_FLAG (1 << 8) /* Out */
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/*
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* This flag is now ignored.
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*/
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#define DM_SKIP_BDGET_FLAG (1 << 9) /* In */
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/*
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* Set this to avoid attempting to freeze any filesystem when suspending.
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*/
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#define DM_SKIP_LOCKFS_FLAG (1 << 10) /* In */
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/*
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* Set this to suspend without flushing queued ios.
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* Also disables flushing uncommitted changes in the thin target before
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* generating statistics for DM_TABLE_STATUS and DM_DEV_WAIT.
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*/
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#define DM_NOFLUSH_FLAG (1 << 11) /* In */
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/*
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* If set, any table information returned will relate to the inactive
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* table instead of the live one. Always check DM_INACTIVE_PRESENT_FLAG
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* is set before using the data returned.
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*/
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#define DM_QUERY_INACTIVE_TABLE_FLAG (1 << 12) /* In */
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/*
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* If set, a uevent was generated for which the caller may need to wait.
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*/
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#define DM_UEVENT_GENERATED_FLAG (1 << 13) /* Out */
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/*
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* If set, rename changes the uuid not the name. Only permitted
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* if no uuid was previously supplied: an existing uuid cannot be changed.
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*/
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#define DM_UUID_FLAG (1 << 14) /* In */
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/*
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* If set, all buffers are wiped after use. Use when sending
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* or requesting sensitive data such as an encryption key.
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*/
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#define DM_SECURE_DATA_FLAG (1 << 15) /* In */
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/*
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* If set, a message generated output data.
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*/
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#define DM_DATA_OUT_FLAG (1 << 16) /* Out */
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/*
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* If set with DM_DEV_REMOVE or DM_REMOVE_ALL this indicates that if
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* the device cannot be removed immediately because it is still in use
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* it should instead be scheduled for removal when it gets closed.
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*
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* On return from DM_DEV_REMOVE, DM_DEV_STATUS or other ioctls, this
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* flag indicates that the device is scheduled to be removed when it
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* gets closed.
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*/
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#define DM_DEFERRED_REMOVE (1 << 17) /* In/Out */
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/*
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* If set, the device is suspended internally.
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*/
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#define DM_INTERNAL_SUSPEND_FLAG (1 << 18) /* Out */
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#endif /* _LINUX_DM_IOCTL_H */
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