/* 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 … #define DM_CONTROL_NODE … #define DM_MAX_TYPE_NAME … #define DM_NAME_LEN … #define DM_UUID_LEN … /* * 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 { … }; /* * Used to specify tables. These structures appear after the * dm_ioctl. */ struct dm_target_spec { … }; /* * Used to retrieve the target dependencies. */ struct dm_target_deps { … }; /* * Used to get a list of all dm devices. */ struct dm_name_list { … }; #define DM_NAME_LIST_FLAG_HAS_UUID … #define DM_NAME_LIST_FLAG_DOESNT_HAVE_UUID … /* * Used to retrieve the target versions */ struct dm_target_versions { … }; /* * Used to pass message to a target */ struct dm_target_msg { … }; /* * If you change this make sure you make the corresponding change * to dm-ioctl.c:lookup_ioctl() */ enum { … }; #define DM_IOCTL … #define DM_VERSION … #define DM_REMOVE_ALL … #define DM_LIST_DEVICES … #define DM_DEV_CREATE … #define DM_DEV_REMOVE … #define DM_DEV_RENAME … #define DM_DEV_SUSPEND … #define DM_DEV_STATUS … #define DM_DEV_WAIT … #define DM_DEV_ARM_POLL … #define DM_TABLE_LOAD … #define DM_TABLE_CLEAR … #define DM_TABLE_DEPS … #define DM_TABLE_STATUS … #define DM_LIST_VERSIONS … #define DM_GET_TARGET_VERSION … #define DM_TARGET_MSG … #define DM_DEV_SET_GEOMETRY … #define DM_VERSION_MAJOR … #define DM_VERSION_MINOR … #define DM_VERSION_PATCHLEVEL … #define DM_VERSION_EXTRA … /* Status bits */ #define DM_READONLY_FLAG … #define DM_SUSPEND_FLAG … #define DM_PERSISTENT_DEV_FLAG … /* * Flag passed into ioctl STATUS command to get table information * rather than current status. */ #define DM_STATUS_TABLE_FLAG … /* * Flags that indicate whether a table is present in either of * the two table slots that a device has. */ #define DM_ACTIVE_PRESENT_FLAG … #define DM_INACTIVE_PRESENT_FLAG … /* * Indicates that the buffer passed in wasn't big enough for the * results. */ #define DM_BUFFER_FULL_FLAG … /* * This flag is now ignored. */ #define DM_SKIP_BDGET_FLAG … /* * Set this to avoid attempting to freeze any filesystem when suspending. */ #define DM_SKIP_LOCKFS_FLAG … /* * 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 … /* * 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 … /* * If set, a uevent was generated for which the caller may need to wait. */ #define DM_UEVENT_GENERATED_FLAG … /* * 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 … /* * 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 … /* * If set, a message generated output data. */ #define DM_DATA_OUT_FLAG … /* * 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 … /* * If set, the device is suspended internally. */ #define DM_INTERNAL_SUSPEND_FLAG … /* * If set, returns in the in buffer passed by UM, the raw table information * that would be measured by IMA subsystem on device state change. */ #define DM_IMA_MEASUREMENT_FLAG … #endif /* _LINUX_DM_IOCTL_H */
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