f6fccb1213
Introduce a bvec merge function for device mapper devices for dynamic size restrictions. This code ensures the requested biovec lies within a single target and then calls a target-specific function to check against any constraints imposed by underlying devices. Signed-off-by: Milan Broz <mbroz@redhat.com> Signed-off-by: Alasdair G Kergon <agk@redhat.com>
303 lines
8.6 KiB
C
303 lines
8.6 KiB
C
/*
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* Copyright (C) 2001 - 2003 Sistina Software (UK) Limited.
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* Copyright (C) 2004 - 2005 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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#include <linux/types.h>
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#define DM_DIR "mapper" /* Slashes not supported */
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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.
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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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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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};
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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_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 14
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#define DM_VERSION_PATCHLEVEL 0
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#define DM_VERSION_EXTRA "-ioctl (2008-04-23)"
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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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*/
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#define DM_NOFLUSH_FLAG (1 << 11) /* In */
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#endif /* _LINUX_DM_IOCTL_H */
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