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Edit File : dm-ioctl.h \| Size : 11.13 KB
/* SPDX-License-Identifier: LGPL-2.0+ WITH Linux-syscall-note / / * Copyright (C) 2001 - 2003 Sistina Software (UK) Limited. * Copyright (C) 2004 - 2009 Red Hat, Inc. All rights reserved. * * This file is released under the LGPL. / #ifndef _LINUX_DM_IOCTL_V4_H #define _LINUX_DM_IOCTL_V4_H #include <linux/types.h> #define DM_DIR "mapper" / Slashes not supported / #define DM_CONTROL_NODE "control" #define DM_MAX_TYPE_NAME 16 #define DM_NAME_LEN 128 #define DM_UUID_LEN 129 / * A traditional ioctl interface for the device mapper. * * Each device can have two tables associated with it, an * 'active' table which is the one currently used by io passing * through the device, and an 'inactive' one which is a table * that is being prepared as a replacement for the 'active' one. * * DM_VERSION: * Just get the version information for the ioctl interface. * * DM_REMOVE_ALL: * Remove all dm devices, destroy all tables. Only really used * for debug. * * DM_LIST_DEVICES: * Get a list of all the dm device names. * * DM_DEV_CREATE: * Create a new device, neither the 'active' or 'inactive' table * slots will be filled. The device will be in suspended state * after creation, however any io to the device will get errored * since it will be out-of-bounds. * * DM_DEV_REMOVE: * Remove a device, destroy any tables. * * DM_DEV_RENAME: * Rename a device or set its uuid if none was previously supplied. * * DM_SUSPEND: * This performs both suspend and resume, depending which flag is * passed in. * Suspend: This command will not return until all pending io to * the device has completed. Further io will be deferred until * the device is resumed. * Resume: It is no longer an error to issue this command on an * unsuspended device. If a table is present in the 'inactive' * slot, it will be moved to the active slot, then the old table * from the active slot will be _destroyed_. Finally the device * is resumed. * * DM_DEV_STATUS: * Retrieves the status for the table in the 'active' slot. * * DM_DEV_WAIT: * Wait for a significant event to occur to the device. This * could either be caused by an event triggered by one of the * targets of the table in the 'active' slot, or a table change. * * DM_TABLE_LOAD: * Load a table into the 'inactive' slot for the device. The * device does _not_ need to be suspended prior to this command. * * DM_TABLE_CLEAR: * Destroy any table in the 'inactive' slot (ie. abort). * * DM_TABLE_DEPS: * Return a set of device dependencies for the 'active' table. * * DM_TABLE_STATUS: * Return the targets status for the 'active' table. * * DM_TARGET_MSG: * Pass a message string to the target at a specific offset of a device. * * DM_DEV_SET_GEOMETRY: * Set the geometry of a device by passing in a string in this format: * * "cylinders heads sectors_per_track start_sector" * * Beware that CHS geometry is nearly obsolete and only provided * for compatibility with dm devices that can be booted by a PC * BIOS. See struct hd_geometry for range limits. Also note that * the geometry is erased if the device size changes. / / * All ioctl arguments consist of a single chunk of memory, with * this structure at the start. If a uuid is specified any * lookup (eg. for a DM_INFO) will be done on that, not the * name. / struct dm_ioctl { / * The version number is made up of three parts: * major - no backward or forward compatibility, * minor - only backwards compatible, * patch - both backwards and forwards compatible. * * All clients of the ioctl interface should fill in the * version number of the interface that they were * compiled with. * * All recognised ioctl commands (ie. those that don't * return -ENOTTY) fill out this field, even if the * command failed. / __u32 version[3]; / in/out / __u32 data_size; / total size of data passed in * including this struct / __u32 data_start; / offset to start of data * relative to start of this struct / __u32 target_count; / in/out / __s32 open_count; / out / __u32 flags; / in/out / / * event_nr holds either the event number (input and output) or the * udev cookie value (input only). * The DM_DEV_WAIT ioctl takes an event number as input. * The DM_SUSPEND, DM_DEV_REMOVE and DM_DEV_RENAME ioctls * use the field as a cookie to return in the DM_COOKIE * variable with the uevents they issue. * For output, the ioctls return the event number, not the cookie. / __u32 event_nr; / in/out / __u32 padding; __u64 dev; / in/out / char name[DM_NAME_LEN]; / device name / char uuid[DM_UUID_LEN]; / unique identifier for * the block device / char data[7]; / padding or data / }; / * Used to specify tables. These structures appear after the * dm_ioctl. / struct dm_target_spec { __u64 sector_start; __u64 length; __s32 status; / used when reading from kernel only / / * Location of the next dm_target_spec. * - When specifying targets on a DM_TABLE_LOAD command, this value is * the number of bytes from the start of the "current" dm_target_spec * to the start of the "next" dm_target_spec. * - When retrieving targets on a DM_TABLE_STATUS command, this value * is the number of bytes from the start of the first dm_target_spec * (that follows the dm_ioctl struct) to the start of the "next" * dm_target_spec. / __u32 next; char target_type[DM_MAX_TYPE_NAME]; / * Parameter string starts immediately after this object. * Be careful to add padding after string to ensure correct * alignment of subsequent dm_target_spec. / }; / * Used to retrieve the target dependencies. / struct dm_target_deps { __u32 count; / Array size / __u32 padding; / unused / __u64 dev[0]; / out / }; / * Used to get a list of all dm devices. / struct dm_name_list { __u64 dev; __u32 next; / offset to the next record from the _start_ of this / char name[0]; / * The following members can be accessed by taking a pointer that * points immediately after the terminating zero character in "name" * and aligning this pointer to next 8-byte boundary. * Uuid is present if the flag DM_NAME_LIST_FLAG_HAS_UUID is set. * * __u32 event_nr; * __u32 flags; * char uuid[0]; / }; #define DM_NAME_LIST_FLAG_HAS_UUID 1 #define DM_NAME_LIST_FLAG_DOESNT_HAVE_UUID 2 / * Used to retrieve the target versions / struct dm_target_versions { __u32 next; __u32 version[3]; char name[0]; }; / * Used to pass message to a target / struct dm_target_msg { __u64 sector; / Device sector / char message[0]; }; / * If you change this make sure you make the corresponding change * to dm-ioctl.c:lookup_ioctl() / enum { / Top level cmds / DM_VERSION_CMD = 0, DM_REMOVE_ALL_CMD, DM_LIST_DEVICES_CMD, / device level cmds / DM_DEV_CREATE_CMD, DM_DEV_REMOVE_CMD, DM_DEV_RENAME_CMD, DM_DEV_SUSPEND_CMD, DM_DEV_STATUS_CMD, DM_DEV_WAIT_CMD, / Table level cmds / DM_TABLE_LOAD_CMD, DM_TABLE_CLEAR_CMD, DM_TABLE_DEPS_CMD, DM_TABLE_STATUS_CMD, / Added later / DM_LIST_VERSIONS_CMD, DM_TARGET_MSG_CMD, DM_DEV_SET_GEOMETRY_CMD, DM_DEV_ARM_POLL_CMD, DM_GET_TARGET_VERSION_CMD, }; #define DM_IOCTL 0xfd #define DM_VERSION _IOWR(DM_IOCTL, DM_VERSION_CMD, struct dm_ioctl) #define DM_REMOVE_ALL _IOWR(DM_IOCTL, DM_REMOVE_ALL_CMD, struct dm_ioctl) #define DM_LIST_DEVICES _IOWR(DM_IOCTL, DM_LIST_DEVICES_CMD, struct dm_ioctl) #define DM_DEV_CREATE _IOWR(DM_IOCTL, DM_DEV_CREATE_CMD, struct dm_ioctl) #define DM_DEV_REMOVE _IOWR(DM_IOCTL, DM_DEV_REMOVE_CMD, struct dm_ioctl) #define DM_DEV_RENAME _IOWR(DM_IOCTL, DM_DEV_RENAME_CMD, struct dm_ioctl) #define DM_DEV_SUSPEND _IOWR(DM_IOCTL, DM_DEV_SUSPEND_CMD, struct dm_ioctl) #define DM_DEV_STATUS _IOWR(DM_IOCTL, DM_DEV_STATUS_CMD, struct dm_ioctl) #define DM_DEV_WAIT _IOWR(DM_IOCTL, DM_DEV_WAIT_CMD, struct dm_ioctl) #define DM_DEV_ARM_POLL _IOWR(DM_IOCTL, DM_DEV_ARM_POLL_CMD, struct dm_ioctl) #define DM_TABLE_LOAD _IOWR(DM_IOCTL, DM_TABLE_LOAD_CMD, struct dm_ioctl) #define DM_TABLE_CLEAR _IOWR(DM_IOCTL, DM_TABLE_CLEAR_CMD, struct dm_ioctl) #define DM_TABLE_DEPS _IOWR(DM_IOCTL, DM_TABLE_DEPS_CMD, struct dm_ioctl) #define DM_TABLE_STATUS _IOWR(DM_IOCTL, DM_TABLE_STATUS_CMD, struct dm_ioctl) #define DM_LIST_VERSIONS _IOWR(DM_IOCTL, DM_LIST_VERSIONS_CMD, struct dm_ioctl) #define DM_GET_TARGET_VERSION _IOWR(DM_IOCTL, DM_GET_TARGET_VERSION_CMD, struct dm_ioctl) #define DM_TARGET_MSG _IOWR(DM_IOCTL, DM_TARGET_MSG_CMD, struct dm_ioctl) #define DM_DEV_SET_GEOMETRY _IOWR(DM_IOCTL, DM_DEV_SET_GEOMETRY_CMD, struct dm_ioctl) #define DM_VERSION_MAJOR 4 #define DM_VERSION_MINOR 46 #define DM_VERSION_PATCHLEVEL 0 #define DM_VERSION_EXTRA "-ioctl (2022-02-22)" / Status bits / #define DM_READONLY_FLAG (1 << 0) / In/Out / #define DM_SUSPEND_FLAG (1 << 1) / In/Out / #define DM_PERSISTENT_DEV_FLAG (1 << 3) / In / / * Flag passed into ioctl STATUS command to get table information * rather than current status. / #define DM_STATUS_TABLE_FLAG (1 << 4) / In / / * Flags that indicate whether a table is present in either of * the two table slots that a device has. / #define DM_ACTIVE_PRESENT_FLAG (1 << 5) / Out / #define DM_INACTIVE_PRESENT_FLAG (1 << 6) / Out / / * Indicates that the buffer passed in wasn't big enough for the * results. / #define DM_BUFFER_FULL_FLAG (1 << 8) / Out / / * This flag is now ignored. / #define DM_SKIP_BDGET_FLAG (1 << 9) / In / / * Set this to avoid attempting to freeze any filesystem when suspending. / #define DM_SKIP_LOCKFS_FLAG (1 << 10) / In / / * Set this to suspend without flushing queued ios. * Also disables flushing uncommitted changes in the thin target before * generating statistics for DM_TABLE_STATUS and DM_DEV_WAIT. / #define DM_NOFLUSH_FLAG (1 << 11) / In / / * If set, any table information returned will relate to the inactive * table instead of the live one. Always check DM_INACTIVE_PRESENT_FLAG * is set before using the data returned. / #define DM_QUERY_INACTIVE_TABLE_FLAG (1 << 12) / In / / * If set, a uevent was generated for which the caller may need to wait. / #define DM_UEVENT_GENERATED_FLAG (1 << 13) / Out / / * If set, rename changes the uuid not the name. Only permitted * if no uuid was previously supplied: an existing uuid cannot be changed. / #define DM_UUID_FLAG (1 << 14) / In / / * If set, all buffers are wiped after use. Use when sending * or requesting sensitive data such as an encryption key. / #define DM_SECURE_DATA_FLAG (1 << 15) / In / / * If set, a message generated output data. / #define DM_DATA_OUT_FLAG (1 << 16) / Out / / * If set with DM_DEV_REMOVE or DM_REMOVE_ALL this indicates that if * the device cannot be removed immediately because it is still in use * it should instead be scheduled for removal when it gets closed. * * On return from DM_DEV_REMOVE, DM_DEV_STATUS or other ioctls, this * flag indicates that the device is scheduled to be removed when it * gets closed. / #define DM_DEFERRED_REMOVE (1 << 17) / In/Out / / * If set, the device is suspended internally. / #define DM_INTERNAL_SUSPEND_FLAG (1 << 18) / Out / #endif / _LINUX_DM_IOCTL_H */ Back

Edit File : dm-ioctl.h | Size : 11.13 KB

/* SPDX-License-Identifier: LGPL-2.0+ WITH Linux-syscall-note */
/*
 * Copyright (C) 2001 - 2003 Sistina Software (UK) Limited.
 * Copyright (C) 2004 - 2009 Red Hat, Inc. All rights reserved.
 *
 * This file is released under the LGPL.
 */

#ifndef _LINUX_DM_IOCTL_V4_H
#define _LINUX_DM_IOCTL_V4_H

#include <linux/types.h>

#define DM_DIR "mapper"		/* Slashes not supported */
#define DM_CONTROL_NODE "control"
#define DM_MAX_TYPE_NAME 16
#define DM_NAME_LEN 128
#define DM_UUID_LEN 129

/*
 * A traditional ioctl interface for the device mapper.
 *
 * Each device can have two tables associated with it, an
 * 'active' table which is the one currently used by io passing
 * through the device, and an 'inactive' one which is a table
 * that is being prepared as a replacement for the 'active' one.
 *
 * DM_VERSION:
 * Just get the version information for the ioctl interface.
 *
 * DM_REMOVE_ALL:
 * Remove all dm devices, destroy all tables.  Only really used
 * for debug.
 *
 * DM_LIST_DEVICES:
 * Get a list of all the dm device names.
 *
 * DM_DEV_CREATE:
 * Create a new device, neither the 'active' or 'inactive' table
 * slots will be filled.  The device will be in suspended state
 * after creation, however any io to the device will get errored
 * since it will be out-of-bounds.
 *
 * DM_DEV_REMOVE:
 * Remove a device, destroy any tables.
 *
 * DM_DEV_RENAME:
 * Rename a device or set its uuid if none was previously supplied.
 *
 * DM_SUSPEND:
 * This performs both suspend and resume, depending which flag is
 * passed in.
 * Suspend: This command will not return until all pending io to
 * the device has completed.  Further io will be deferred until
 * the device is resumed.
 * Resume: It is no longer an error to issue this command on an
 * unsuspended device.  If a table is present in the 'inactive'
 * slot, it will be moved to the active slot, then the old table
 * from the active slot will be _destroyed_.  Finally the device
 * is resumed.
 *
 * DM_DEV_STATUS:
 * Retrieves the status for the table in the 'active' slot.
 *
 * DM_DEV_WAIT:
 * Wait for a significant event to occur to the device.  This
 * could either be caused by an event triggered by one of the
 * targets of the table in the 'active' slot, or a table change.
 *
 * DM_TABLE_LOAD:
 * Load a table into the 'inactive' slot for the device.  The
 * device does _not_ need to be suspended prior to this command.
 *
 * DM_TABLE_CLEAR:
 * Destroy any table in the 'inactive' slot (ie. abort).
 *
 * DM_TABLE_DEPS:
 * Return a set of device dependencies for the 'active' table.
 *
 * DM_TABLE_STATUS:
 * Return the targets status for the 'active' table.
 *
 * DM_TARGET_MSG:
 * Pass a message string to the target at a specific offset of a device.
 *
 * DM_DEV_SET_GEOMETRY:
 * Set the geometry of a device by passing in a string in this format:
 *
 * "cylinders heads sectors_per_track start_sector"
 *
 * Beware that CHS geometry is nearly obsolete and only provided
 * for compatibility with dm devices that can be booted by a PC
 * BIOS.  See struct hd_geometry for range limits.  Also note that
 * the geometry is erased if the device size changes.
 */

/*
 * All ioctl arguments consist of a single chunk of memory, with
 * this structure at the start.  If a uuid is specified any
 * lookup (eg. for a DM_INFO) will be done on that, *not* the
 * name.
 */
struct dm_ioctl {
	/*
	 * The version number is made up of three parts:
	 * major - no backward or forward compatibility,
	 * minor - only backwards compatible,
	 * patch - both backwards and forwards compatible.
	 *
	 * All clients of the ioctl interface should fill in the
	 * version number of the interface that they were
	 * compiled with.
	 *
	 * All recognised ioctl commands (ie. those that don't
	 * return -ENOTTY) fill out this field, even if the
	 * command failed.
	 */
	__u32 version[3];	/* in/out */
	__u32 data_size;	/* total size of data passed in
				 * including this struct */

__u32 data_start;	/* offset to start of data
				 * relative to start of this struct */

__u32 target_count;	/* in/out */
	__s32 open_count;	/* out */
	__u32 flags;		/* in/out */

/*
	 * event_nr holds either the event number (input and output) or the
	 * udev cookie value (input only).
	 * The DM_DEV_WAIT ioctl takes an event number as input.
	 * The DM_SUSPEND, DM_DEV_REMOVE and DM_DEV_RENAME ioctls
	 * use the field as a cookie to return in the DM_COOKIE
	 * variable with the uevents they issue.
	 * For output, the ioctls return the event number, not the cookie.
	 */
	__u32 event_nr;      	/* in/out */
	__u32 padding;

__u64 dev;		/* in/out */

char name[DM_NAME_LEN];	/* device name */
	char uuid[DM_UUID_LEN];	/* unique identifier for
				 * the block device */
	char data[7];		/* padding or data */
};

/*
 * Used to specify tables.  These structures appear after the
 * dm_ioctl.
 */
struct dm_target_spec {
	__u64 sector_start;
	__u64 length;
	__s32 status;		/* used when reading from kernel only */

/*
	 * Location of the next dm_target_spec.
	 * - When specifying targets on a DM_TABLE_LOAD command, this value is
	 *   the number of bytes from the start of the "current" dm_target_spec
	 *   to the start of the "next" dm_target_spec.
	 * - When retrieving targets on a DM_TABLE_STATUS command, this value
	 *   is the number of bytes from the start of the first dm_target_spec
	 *   (that follows the dm_ioctl struct) to the start of the "next"
	 *   dm_target_spec.
	 */
	__u32 next;

char target_type[DM_MAX_TYPE_NAME];

/*
	 * Parameter string starts immediately after this object.
	 * Be careful to add padding after string to ensure correct
	 * alignment of subsequent dm_target_spec.
	 */
};

/*
 * Used to retrieve the target dependencies.
 */
struct dm_target_deps {
	__u32 count;	/* Array size */
	__u32 padding;	/* unused */
	__u64 dev[0];	/* out */
};

/*
 * Used to get a list of all dm devices.
 */
struct dm_name_list {
	__u64 dev;
	__u32 next;		/* offset to the next record from
				   the _start_ of this */
	char name[0];

/*
	 * The following members can be accessed by taking a pointer that
	 * points immediately after the terminating zero character in "name"
	 * and aligning this pointer to next 8-byte boundary.
	 * Uuid is present if the flag DM_NAME_LIST_FLAG_HAS_UUID is set.
	 *
	 * __u32 event_nr;
	 * __u32 flags;
	 * char uuid[0];
	 */
};

#define DM_NAME_LIST_FLAG_HAS_UUID		1
#define DM_NAME_LIST_FLAG_DOESNT_HAVE_UUID	2

/*
 * Used to retrieve the target versions
 */
struct dm_target_versions {
        __u32 next;
        __u32 version[3];

char name[0];
};

/*
 * Used to pass message to a target
 */
struct dm_target_msg {
	__u64 sector;	/* Device sector */

char message[0];
};

/*
 * If you change this make sure you make the corresponding change
 * to dm-ioctl.c:lookup_ioctl()
 */
enum {
	/* Top level cmds */
	DM_VERSION_CMD = 0,
	DM_REMOVE_ALL_CMD,
	DM_LIST_DEVICES_CMD,

/* device level cmds */
	DM_DEV_CREATE_CMD,
	DM_DEV_REMOVE_CMD,
	DM_DEV_RENAME_CMD,
	DM_DEV_SUSPEND_CMD,
	DM_DEV_STATUS_CMD,
	DM_DEV_WAIT_CMD,

/* Table level cmds */
	DM_TABLE_LOAD_CMD,
	DM_TABLE_CLEAR_CMD,
	DM_TABLE_DEPS_CMD,
	DM_TABLE_STATUS_CMD,

/* Added later */
	DM_LIST_VERSIONS_CMD,
	DM_TARGET_MSG_CMD,
	DM_DEV_SET_GEOMETRY_CMD,
	DM_DEV_ARM_POLL_CMD,
	DM_GET_TARGET_VERSION_CMD,
};

#define DM_IOCTL 0xfd

#define DM_VERSION       _IOWR(DM_IOCTL, DM_VERSION_CMD, struct dm_ioctl)
#define DM_REMOVE_ALL    _IOWR(DM_IOCTL, DM_REMOVE_ALL_CMD, struct dm_ioctl)
#define DM_LIST_DEVICES  _IOWR(DM_IOCTL, DM_LIST_DEVICES_CMD, struct dm_ioctl)

#define DM_DEV_CREATE    _IOWR(DM_IOCTL, DM_DEV_CREATE_CMD, struct dm_ioctl)
#define DM_DEV_REMOVE    _IOWR(DM_IOCTL, DM_DEV_REMOVE_CMD, struct dm_ioctl)
#define DM_DEV_RENAME    _IOWR(DM_IOCTL, DM_DEV_RENAME_CMD, struct dm_ioctl)
#define DM_DEV_SUSPEND   _IOWR(DM_IOCTL, DM_DEV_SUSPEND_CMD, struct dm_ioctl)
#define DM_DEV_STATUS    _IOWR(DM_IOCTL, DM_DEV_STATUS_CMD, struct dm_ioctl)
#define DM_DEV_WAIT      _IOWR(DM_IOCTL, DM_DEV_WAIT_CMD, struct dm_ioctl)
#define DM_DEV_ARM_POLL  _IOWR(DM_IOCTL, DM_DEV_ARM_POLL_CMD, struct dm_ioctl)

#define DM_TABLE_LOAD    _IOWR(DM_IOCTL, DM_TABLE_LOAD_CMD, struct dm_ioctl)
#define DM_TABLE_CLEAR   _IOWR(DM_IOCTL, DM_TABLE_CLEAR_CMD, struct dm_ioctl)
#define DM_TABLE_DEPS    _IOWR(DM_IOCTL, DM_TABLE_DEPS_CMD, struct dm_ioctl)
#define DM_TABLE_STATUS  _IOWR(DM_IOCTL, DM_TABLE_STATUS_CMD, struct dm_ioctl)

#define DM_LIST_VERSIONS _IOWR(DM_IOCTL, DM_LIST_VERSIONS_CMD, struct dm_ioctl)
#define DM_GET_TARGET_VERSION _IOWR(DM_IOCTL, DM_GET_TARGET_VERSION_CMD, struct dm_ioctl)

#define DM_TARGET_MSG	 _IOWR(DM_IOCTL, DM_TARGET_MSG_CMD, struct dm_ioctl)
#define DM_DEV_SET_GEOMETRY	_IOWR(DM_IOCTL, DM_DEV_SET_GEOMETRY_CMD, struct dm_ioctl)

#define DM_VERSION_MAJOR	4
#define DM_VERSION_MINOR	46
#define DM_VERSION_PATCHLEVEL	0
#define DM_VERSION_EXTRA	"-ioctl (2022-02-22)"

/* Status bits */
#define DM_READONLY_FLAG	(1 << 0) /* In/Out */
#define DM_SUSPEND_FLAG		(1 << 1) /* In/Out */
#define DM_PERSISTENT_DEV_FLAG	(1 << 3) /* In */

/*
 * Flag passed into ioctl STATUS command to get table information
 * rather than current status.
 */
#define DM_STATUS_TABLE_FLAG	(1 << 4) /* In */

/*
 * Flags that indicate whether a table is present in either of
 * the two table slots that a device has.
 */
#define DM_ACTIVE_PRESENT_FLAG   (1 << 5) /* Out */
#define DM_INACTIVE_PRESENT_FLAG (1 << 6) /* Out */

/*
 * Indicates that the buffer passed in wasn't big enough for the
 * results.
 */
#define DM_BUFFER_FULL_FLAG	(1 << 8) /* Out */

/*
 * This flag is now ignored.
 */
#define DM_SKIP_BDGET_FLAG	(1 << 9) /* In */

/*
 * Set this to avoid attempting to freeze any filesystem when suspending.
 */
#define DM_SKIP_LOCKFS_FLAG	(1 << 10) /* In */

/*
 * Set this to suspend without flushing queued ios.
 * Also disables flushing uncommitted changes in the thin target before
 * generating statistics for DM_TABLE_STATUS and DM_DEV_WAIT.
 */
#define DM_NOFLUSH_FLAG		(1 << 11) /* In */

/*
 * If set, any table information returned will relate to the inactive
 * table instead of the live one.  Always check DM_INACTIVE_PRESENT_FLAG
 * is set before using the data returned.
 */
#define DM_QUERY_INACTIVE_TABLE_FLAG	(1 << 12) /* In */

/*
 * If set, a uevent was generated for which the caller may need to wait.
 */
#define DM_UEVENT_GENERATED_FLAG	(1 << 13) /* Out */

/*
 * If set, rename changes the uuid not the name.  Only permitted
 * if no uuid was previously supplied: an existing uuid cannot be changed.
 */
#define DM_UUID_FLAG			(1 << 14) /* In */

/*
 * If set, all buffers are wiped after use. Use when sending
 * or requesting sensitive data such as an encryption key.
 */
#define DM_SECURE_DATA_FLAG		(1 << 15) /* In */

/*
 * If set, a message generated output data.
 */
#define DM_DATA_OUT_FLAG		(1 << 16) /* Out */

/*
 * If set with DM_DEV_REMOVE or DM_REMOVE_ALL this indicates that if
 * the device cannot be removed immediately because it is still in use
 * it should instead be scheduled for removal when it gets closed.
 *
 * On return from DM_DEV_REMOVE, DM_DEV_STATUS or other ioctls, this
 * flag indicates that the device is scheduled to be removed when it
 * gets closed.
 */
#define DM_DEFERRED_REMOVE		(1 << 17) /* In/Out */

/*
 * If set, the device is suspended internally.
 */
#define DM_INTERNAL_SUSPEND_FLAG	(1 << 18) /* Out */

#endif				/* _LINUX_DM_IOCTL_H */

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